JP2021146384A - Casting apparatus and casting method - Google Patents

Abstract

To provide a casting apparatus and a casting method capable of, without inhibiting the closing of a mold, suitably obtaining a cast product with no foreign matters mixed therein.SOLUTION: Provided is a drive mechanism 20 in a casting apparatus 10, by which during rising of the level of a molten metal from the start of pouring until the sprue molten metal level Ma of the molten metal M reaches a level above a lower end surface 52a of a facing part 52 of an upper mold 16, a vertical direction position of the lower end surface 52a of the facing part 52 is arranged below an upper side product cavity forming part 50 and at the same level as a lower side inlet forming part 36 or below the lower side inlet forming part 36 in a state where the facing part 52 and a lower mold runner forming part 32 of a lower mold 14 are separated from each other. During forming of the product cavity, the vertical direction position of the lower end surface 52a of the facing part 52 is maintained above an inner bottom surface of a runner bottom part 46.SELECTED DRAWING: Figure 1

Description

The present invention relates to a casting apparatus and a casting method for closing a mold while pressing a molten metal between a lower mold and an upper mold.

For example, Patent Document 1 proposes a casting apparatus provided with a mold composed of a lower mold and an upper mold and a drive mechanism for raising and lowering the upper mold, and closing the mold while pressing the molten metal between the lower mold and the upper mold. ing. In this casting apparatus, the upper die is raised by a drive mechanism, and pouring is started in a state where the flow path cross-sectional area of the molten metal between the lower die and the upper die is larger than that of the product cavity. After that, the upper mold is lowered, and the mold is closed while pressing the molten metal with the lower mold to form a product cavity.

As a result, the flow path cross-sectional area of the molten metal at the time of pouring can be made larger than that at the time of forming the product cavity without changing the size of the product cavity itself. Therefore, for example, even when the distance between the product cavity forming surfaces of the mold is narrow in order to obtain a thin-walled cast product or the like, or when the melting point of the molten metal supplied to the mold is relatively high, poor running of the molten metal or the like occurs. It is possible to satisfactorily fill the product cavity with the molten metal while suppressing the occurrence.

Japanese Unexamined Patent Publication No. 4-59165

By the way, in order to obtain a high-quality cast product by a casting apparatus, it is necessary to prevent foreign matter such as slag contained in the molten metal supplied to the sprue from flowing into the product cavity. Foreign matter is likely to be generated while floating on the surface of the hot water when pouring into the sprue. Therefore, in order to suppress the inflow of slag into the product cavity, for example, it is conceivable that the surface of the molten metal in the sprue is rapidly raised above the inlet of the product cavity after the start of pouring. In this case, by providing a regulating portion in the runner to reduce the separation distance between the upper mold and the lower mold in the mold closing direction, the amount of molten metal flowing into the product cavity side is smaller than the amount of molten metal supplied to the sprue. Is adjusted so that.

However, in the casting apparatus that closes the molten metal while pressing the molten metal between the lower mold and the upper mold as described above, the pouring is started in a state where the lower mold and the upper mold are separated from each other than when the product cavity is formed. For this reason, if a regulating portion is provided in the runner to reduce the distance between the lower mold and the upper mold in the mold closing direction at the start of pouring, the regulating portion will be used when the lower mold and the upper mold are closer to each other when the mold is closed. There is a concern that the lower mold and the upper mold may interfere with each other. As a result, the distance between the upper die and the lower die cannot be made sufficiently small, and as a result, there is a concern that the inflow of slag cannot be sufficiently suppressed. Further, if the formation of the product cavity is hindered by the interference between the lower mold and the upper mold in the regulation portion, it becomes difficult to obtain a good cast product.

Therefore, an object of the present invention is to provide a casting apparatus and a casting method capable of satisfactorily obtaining a cast product in which foreign matter is suppressed from being mixed in without hindering mold closing of the mold.

One aspect of the present invention includes a mold having a lower mold and an upper mold capable of forming a product cavity, and a drive mechanism for relatively moving the lower mold and the upper mold, and the lower mold and the upper mold are provided. It is a casting device that closes the mold while pressing the molten metal between the mold and the lower mold. It has a mold runner forming portion, a lower product cavity forming portion in which molten metal is supplied through the sprue and the runner, and a lower inlet forming portion forming an inlet of the molten metal in the product cavity. The lower mold sprue forming portion has a sprue bottom portion arranged below the lower inlet forming portion, and the upper mold forms the sprue together with the lower sprue forming portion. An upper product cavity forming portion capable of forming the product cavity between the forming portion and the lower product cavity forming portion, and an opposing portion capable of facing the bottom of the runner along the mold closing direction of the mold. The drive mechanism has the above, during the period of rising of the molten metal from the start of pouring into the sprue until the sprue surface of the molten metal in the sprue reaches above the lower end surface of the facing portion. With the facing portion and the lower mold forming portion separated from each other, the vertical position of the lower end surface of the facing portion is below the upper product cavity forming portion and with the lower inlet forming portion. It is arranged at the same level or below the lower entrance forming portion, and at the time of forming the product cavity, the vertical position of the lower end surface of the facing portion is maintained above the inner bottom surface of the runner bottom portion.

Another aspect of the present invention includes a mold having a lower mold and an upper mold capable of forming a product cavity, and a drive mechanism for relatively moving the lower mold and the upper mold, and the lower mold and the upper mold are provided. It is a casting method using a casting device that closes the mold while pressing the molten metal with the upper mold. The lower mold communicates with a lower mold sprue forming portion that forms a sprue extending vertically and the sprue. A lower mold channel forming portion that forms a runner, a lower product cavity forming portion that supplies molten metal through the sprue and the runner, and a lower inlet that forms an inlet of the molten metal in the product cavity. The lower mold forming portion has a forming portion, and the lower mold forming portion has a running channel bottom portion arranged below the lower entrance forming portion, and the upper mold is described together with the lower mold sprue forming portion. An upper product cavity forming portion capable of forming the product cavity between the upper mold sprue forming portion forming the sprue and the lower product cavity forming portion, and the bottom of the sprue along the mold closing direction of the mold. The casting method has a facing portion that can face each other, and the casting method is from the start of pouring into the sprue until the sprue surface of the molten metal in the sprue reaches above the lower end surface of the facing portion. During the surface rising period, the vertical position of the lower end surface of the facing portion is lower than the upper product cavity forming portion and the said After the molten metal level raising step of arranging the same as or below the lower entrance forming portion of the lower inlet forming portion and the molten metal level raising step, the vertical position of the lower end surface of the facing portion is set in the runner. It has a product cavity forming step of forming the product cavity by closing the mold while maintaining the bottom portion above the inner bottom surface.

In this casting apparatus, the facing portion of the upper die can face the bottom of the runner arranged below the lower inlet forming portion of the lower die along the mold closing direction. Therefore, during the rise level of the molten metal, the position of the lower end surface of the facing portion in the vertical direction is lower and lower than the upper product cavity forming portion without contacting the facing portion with the lower runner forming portion. It can be placed at the same level as the entrance forming portion or below the lower entrance forming portion. By arranging the facing portions in this way, it is possible to prevent the slag floating on the upper surface of the molten metal from flowing into the lower product cavity forming portion side via the lower inlet forming portion by the facing portion.

Further, even if the mold is closed to form the product cavity, the vertical position of the lower end surface of the facing portion is maintained above the inner bottom surface of the bottom portion of the runner. At this time, as described above, since the bottom portion of the lower mold runner is arranged below the lower inlet forming portion, the facing portion of the upper mold and the lower mold runner forming portion are easily maintained in a separated state. be able to. As a result, it is possible to satisfactorily form the product cavity by avoiding interference between the upper mold and the lower mold when the mold is closed.

From the above, according to the present invention, it is possible to satisfactorily obtain a cast product in which the mixing of foreign substances is suppressed without hindering the mold closing of the mold.

It is schematic cross-sectional view explaining the molten metal level rise period of the casting apparatus which concerns on embodiment of this invention. It is the schematic cross-sectional view explaining when the pouring of the casting apparatus of FIG. 1 is completed. It is schematic cross-sectional view explaining the time of forming the product cavity of the casting apparatus of FIG. It is the schematic top view of the main part of the mold of the casting apparatus of FIG. It is a partially enlarged view for demonstrating the discharge of the casting apparatus of FIG. It is schematic cross-sectional view explaining the molten metal level rise period of the casting apparatus which concerns on a modification. It is the schematic cross-sectional view explaining the inflow promotion period of the casting apparatus of FIG. 6 is a schematic cross-sectional view illustrating the time of forming a product cavity of the casting apparatus of FIG. It is schematic cross-sectional view explaining the molten metal level rise period of the casting apparatus which concerns on another modification. It is the schematic cross-sectional view explaining the inflow promotion period of the casting apparatus of FIG. 9 is a schematic cross-sectional view illustrating the time when the product cavity of the casting apparatus of FIG. 9 is formed. It is schematic cross-sectional view explaining the start of pouring of a casting apparatus which concerns on another modification. It is the schematic cross-sectional view explaining the time of forming the product cavity of the casting apparatus of FIG.

Suitable embodiments of the casting apparatus and casting method according to the present invention will be described in detail with reference to the accompanying drawings. In the following figures, components having the same or similar functions and effects may be designated by the same reference numerals, and repeated description may be omitted.

The casting apparatus 10 according to the present embodiment shown in FIG. 1 is used to obtain a cast steel product (not shown) having a thin wall thickness (for example, a thickness of 3 mm or less, particularly preferably about 1.5 to 1.2 mm). Can be suitably applied to. Therefore, in the following, a case where a cast product made of thin-walled cast steel is obtained by the casting apparatus 10 will be described as an example. However, the casting product obtained by the casting apparatus 10 is not limited to the above-mentioned thin wall thickness, and can have various thicknesses. The material of the cast product obtained by the casting apparatus 10 is not limited to cast steel, and is used for manufacturing general cast products such as iron alloys such as cast iron, aluminum alloys, copper alloys, magnesium alloys, and zinc alloys. Can be metal.

The casting apparatus 10 includes a mold 18 having a lower mold 14 and an upper mold 16 capable of forming a product cavity 12 (FIG. 3), and a drive mechanism 20 for relatively moving the lower mold 14 and the upper mold 16. The mold is closed while pressing the molten metal M between the lower mold 14 and the upper mold 16. In FIG. 4, the drive mechanism 20 is not shown.

As described above, when a cast product made of cast steel is obtained, a molten metal M made of molten steel (molten steel) is supplied to the mold 18. Since steel has a higher melting point than other metals such as aluminum, the temperature of the molten metal M also rises. Therefore, in the present embodiment, in order to improve the heat resistance of the mold 18, in the lower mold 14 and the upper mold 16, the sand mold portion 22 is located in a portion that comes into contact with the molten metal M at least at the time of pouring or closing the mold. Is provided. The sand mold portion 22 is made of a sand layer having excellent heat resistance as compared with a general metal casting mold or the like.

Further, in the present embodiment, in order to maintain the rigidity and strength of the mold 18, for example, a backup mold portion 24 made of metal, ceramics, or the like is provided so as to support the sand mold portion 22 of the lower mold 14 and the upper mold 16. There is. Although the mold 18 is not shown, the mold 18 may be a sand mold in which the entire mold 18 is made of sand, instead of the composite mold in which the sand mold portion 22 and the backup mold portion 24 are integrated as described above. Alternatively, the entire mold 18 may be a mold made of metal.

The lower mold 14 has a lower mold main body 28 provided with a recess 26 that is recessed from the upper side to the lower side, and the lower mold sprue forming portion 30, the lower mold sprue forming portion 32, and the lower side are provided in the recess 26. A product cavity forming portion 34, a lower entrance forming portion 36, and a discharge forming portion 38 are provided. As shown in FIG. 4, when viewed from above the casting apparatus 10, at least a part of the upper mold 16 can be accommodated in the recess 26 of the lower mold main body 28. Further, the lower mold sprue forming portion 30 of the lower mold 14 is arranged outside the upper mold 16 housed in the recess 26, and forms a sprue 40 extending vertically as shown in FIG.

The lower runner forming portion 32 forms a runner 42 communicating with the lower part of the sprue 40. The molten metal M is supplied to the lower product cavity forming portion 34 via the sprue 40 and the runner 42. As shown in FIG. 3, the lower inlet forming portion 36 forms the inlet 44 of the molten metal M in the product cavity 12. The lower runner forming portion 32 has a runner bottom portion 46 arranged below the lower entrance forming portion 36. By providing such a runner bottom portion 46, the lower mold sprue forming portion 30 side is depressed downward from the lower entrance forming portion 36 of the lower mold 14.

As shown in FIG. 4, the discharge forming portion 38 is provided so as to surround the outer peripheral edge portion of the lower product cavity forming portion 34, and forms a discharge 48 through which the molten metal M flowing out of the product cavity 12 can flow. .. The details of the vomiting 48 will be described later.

The upper mold 16 can form a product cavity 12 (FIG. 3) between the upper mold sprue forming portion 49 that forms the sprue 40 together with the lower mold sprue forming portion 30 and the lower product cavity forming portion 34 of the lower mold 14. It has an upper product cavity forming portion 50 and an opposing portion 52 that can face the bottom portion 46 of the runner along the mold closing direction of the mold 18. As shown in FIGS. 2 and 3, in the casting apparatus 10, the drive mechanism 20 causes the upper mold 16 to be formed along the lower product cavity forming portion 34 (so as to be substantially parallel) by the drive mechanism 20. When arranged, the positions of the facing portion 52 and the upper product cavity forming portion 50 in the vertical direction are the same (including substantially the same).

The facing portion 52 of the upper mold 16 may form a runner 42 together with the lower mold runner forming portion 32. Further, of the peripheral surface 16a of the upper mold 16, the portion of the lower mold 14 facing the lower sprue forming portion 30 is the upper sprue forming portion 49. Further, of the peripheral surface 16a of the upper mold 16, the portion of the lower mold 14 facing the discharge forming portion 38 (the portion excluding the upper mold sprue forming portion 49) forms a discharge 48 together with the discharge forming portion 38. It is preferable to do so.

The drive mechanism 20 is controlled by, for example, a control unit (not shown), and the upper die 16 can be moved with respect to the lower die 14. Specifically, as shown in FIGS. 1 and 2, the drive mechanism 20 can rotate the upper die 16 around the rotation fulcrum P. As shown in FIG. 3, the size of the product cavity 12 in the thickness direction (vertical direction in the present embodiment) is smaller than the size in the length direction intersecting the thickness direction. Assuming that the portion of the outer peripheral edge of the product cavity 12 facing the inlet 44 of the molten metal M of the product cavity 12 and the portion facing the product cavity 12 in the length direction is the terminal tip portion 54, the rotation fulcrum of the upper die 16 P is arranged closer to the inlet 44 of the molten metal M than the terminal tip portion 54. In the following, regarding the mold 18, the side that becomes the inlet 44 of the molten metal M when the product cavity 12 is formed (at the time of forming the product cavity) is also referred to as the inlet side, and the side that becomes the terminal tip portion 54 is the tip side. Also called.

Further, in addition to the above rotation, the drive mechanism 20 moves the upper mold 16 linearly (parallel movement) along the vertical direction as shown in FIGS. 2 and 3, and approaches or approaches the lower mold 14. It is possible to separate them. Thereby, it is possible to adjust the vertical distance between the lower product cavity forming portion 34 including the vicinity of the rotation fulcrum P and the upper product cavity forming portion 50.

In the present embodiment, when the mold 18 is closed, as shown in FIG. 2, the drive mechanism 20 causes the upper product cavity forming portion 50 to be along the lower product cavity forming portion 34 (so as to be substantially parallel). ) Rotate the upper mold 16 to adjust its horizontal orientation. In this state, by bringing the upper mold 16 closer to the lower mold 14, the product cavity 12 is formed between the lower product cavity forming portion 34 and the upper product cavity forming portion 50, as shown in FIG. In both the state where the product cavity 12 is formed in this way (at the time of forming the product cavity) and before the product cavity 12 is formed, the facing portion 52 of the upper mold 16 and the lower mold runner forming portion 32 of the lower mold 14 are It is maintained in a separated state. At this time, the distance between the facing portion 52 and the lower runner forming portion 32 is maintained at a size (for example, about 2 mm) at which the molten metal M can flow even if a solidified layer is generated on the surface of the molten metal M. Is preferable.

In the present embodiment, the drive mechanism 20 makes the upper die 16 movable with respect to the lower die 14 which is positioned and fixed, but the upper die 16 and the lower die 14 can move relatively in the above direction. It should be. Therefore, for example, the lower mold 14 may be movable by the drive mechanism 20 instead of the upper mold 16, or both the upper mold 16 and the lower mold 14 may be movable by the drive mechanism 20. good.

The casting apparatus 10 according to the present embodiment is basically configured as described above. Hereinafter, a casting method using the casting apparatus 10 will be described. In this casting method, first, a molten metal level raising step is performed. In the molten metal level raising step, as shown in FIG. 1, the upper die 16 is rotated by the drive mechanism 20 to arrange the lower end surface 52a of the facing portion 52 below the upper product cavity forming portion 50. Further, the position of the upper mold 16 with respect to the lower mold 14 is adjusted by moving the upper mold 16 in parallel by the drive mechanism 20, and the facing portion 52 and the lower mold runner forming portion 32 are separated from each other. The lower end surface 52a of the portion 52 is arranged so as to be the same (including substantially the same) as the lower entrance forming portion 36 in the vertical direction. Then, for example, the pouring of hot water into the sprue 40 via the ladle 56 is started, and the sprue level rise period until the sprue sprue surface Ma of the molten metal M in the sprue 40 reaches above the lower end surface 52a of the facing portion 52. Meanwhile, the above arrangement of the lower mold 14 and the upper mold 16 is maintained. In the step of raising the molten metal level, the drive mechanism 20 may arrange the lower end surface 52a of the facing portion 52 below the lower inlet forming portion 36.

With the start of pouring, the sprue surface Ma of the molten metal M of the lower type runner forming portion 32 rises. At this time, the sprue hot water surface Ma reaches the lower entrance forming portion 36 by arranging the lower end surface 52a of the facing portion 52 and the lower entrance forming portion 36 in the vertical direction so as to have the above relationship. It reaches the lower end surface 52a of the facing portion 52 at the same time as or faster than the timing. Further, the molten metal M supplied to the sprue 40 passes between the facing portion 52 of the upper mold 16 and the lower mold runner forming portion 32 of the lower mold 14, and passes through the lower inlet forming portion 36 to the lower product cavity. It flows into the forming portion 34 side.

The amount of molten metal poured from the ladle 56 should be larger than the amount of molten metal flowing from between the lower end surface 52a of the facing portion 52 and the lower mold channel forming portion 32 to the lower product cavity forming portion 34 side. Set to. As a result, the molten metal M can be stored in the sprue 40, so that most of the slag generated during pouring can be retained in the sprue 40.

Next, the drive mechanism 20 rotates the upper mold 16 in the direction in which the facing portion 52 of the upper mold 16 is separated from the lower mold runner forming portion 32 (direction of arrow X1 in FIG. 1) to provide an inflow promotion period. Perform the inflow promotion process. Specifically, in the inflow promotion step, while maintaining the sprue surface Ma above the lower end surface 52a of the facing portion 52, the distance between the bottom portion 46 of the runner and the lower end surface 52a of the facing portion 52 is set from the sprue level rising period. By increasing the size, an inflow promotion period will be provided. As a result, the amount of molten metal flowing from the sprue 40 to the lower product cavity forming portion 34 side can be increased more than the molten metal level rising period, so that the molten metal M is promptly supplied to the lower product cavity forming portion 34 side. Becomes possible.

In the present embodiment, the drive mechanism 20 rotates the upper die 16 to a position where the upper product cavity forming portion 50 is aligned (substantially parallel) with the lower product cavity forming portion 34 at intervals. As a result, the distance between the bottom portion 46 of the runner and the lower end surface 52a of the facing portion 52 during the inflow promotion period can be made larger than the distance between the bottom portion 46 of the runner and the lower end surface 52a of the facing portion 52 during the period of rising the flow level. can.

In the present embodiment, the molten metal M supplied into the recess 26 of the lower mold 14 by the pouring reaches a predetermined amount, and after the pouring into the sprue 40 is completed, the upper mold 16 is moved as described above. The inflow promotion process will be performed. However, if it is possible to maintain the sprue surface Ma above the lower end surface 52a of the facing portion 52, the inflow promoting step may be performed while pouring the water (during the pouring).

Next, the drive mechanism 20 keeps the vertical position of the lower end surface 52a of the facing portion 52 above the inner bottom surface of the runner bottom portion 46, while moving the upper mold 16 downward (in the direction of arrow X2 in FIG. 2). By moving in parallel, as shown in FIG. 3, the mold 18 is closed and the product cavity forming step of forming the product cavity 12 is performed.

That is, in the product cavity forming step, by moving the upper mold 16 as described above, the mold is closed while pressing the molten metal M between the lower mold 14 and the upper mold 16, and the molten metal M is transferred to the product cavity 12. It can be filled. At this time, the molten metal M flowing out from between the lower product cavity forming portion 34 and the upper product cavity forming portion 50 flows into the discharge 48 surrounding the outer peripheral edge portion of the product cavity 12. That is, it is possible to prevent the excess molten metal M from staying in the product cavity 12 while being pressed between the lower mold 14 and the upper mold 16. As a result, the pressure of the molten metal M applied to the mold 18 when the mold is closed is reduced.

As shown in FIG. 5, for example, the inflow direction F of the molten metal M flowing into the spout 48 is along the first wall surface 58 of the spout forming portion 38. The first wall surface 58 extends from the product cavity 12 to the outside and upward of the product cavity 12. On the outside of the first wall surface 58 (on the outer peripheral edge side of the recess 26), a second wall surface 60 is provided continuously with the first wall surface 58. That is, the second wall surface 60 is provided on the downstream side (front) of the inflow direction F of the molten metal M into the discharge 48.

The angle θ formed by the second wall surface 60 and the inflow direction F of the molten metal M (the surface direction of the first wall surface 58) is preferably larger than 90 ° and 180 ° or less, and more preferably 135 °. By making the angle θ larger than 90 °, it is possible to prevent the molten metal M flowing into the spout 48 from colliding with the second wall surface 60 and being bounced back to the product cavity 12 side. Therefore, the molten metal M applied to the mold 18 when the mold is closed. The increase in pressure can be suppressed. By setting the angle θ to 180 ° or less, the mold 18 (particularly the lower mold 14 in this embodiment) is outside the product cavity 12 while suppressing the increase in the pressure of the molten metal M applied to the mold 18 as described above. It is possible to suppress the increase in size. By setting the angle θ to 135 °, it is possible to more appropriately balance the increase in the pressure of the molten metal M applied to the mold 18 with the suppression of the enlargement of the mold 18.

With the mold 18 closed as described above, the molten metal M in the recess 26 is solidified by allowing it to cool or cool, and then the mold is opened to release the cast product (not shown). Is obtained. At the time of mold release, the sand mold portion 22 of the mold 18 may be disintegrated to be peeled from the cast product.

Although not shown, the cast product includes a product part solidified in the product cavity 12 and a plan part solidified in a part other than the product cavity 12 (spout 48, sprue 40, runner 42, etc.) in the recess 26. Has. Therefore, a thin-walled cast product can be obtained by subjecting the cast product to, for example, machining such as cutting, cutting, and grinding as necessary, and removing the plan portion from the product portion.

As described above, in the casting apparatus 10 and the casting method according to the present embodiment, the facing portion 52 of the upper mold 16 is formed on the bottom portion 46 of the runner arranged below the lower entrance forming portion 36 of the lower mold 14. It can face each other along the closing direction. Therefore, during the rise level of the molten metal, the vertical position of the lower end surface 52a of the facing portion 52 is set below the upper product cavity forming portion 50 without contacting the facing portion 52 and the lower runner forming portion 32. And can be arranged at the same level as the lower entrance forming portion 36 or below the lower entrance forming portion 36. By arranging the facing portion 52 in this way, the facing portion 52 prevents foreign matter S such as slag floating on the upper surface of the molten metal M from flowing into the lower product cavity forming portion 34 side via the lower inlet forming portion 36. Can be suppressed by.

Further, even if the mold 18 is closed to form the product cavity 12, the vertical position of the lower end surface 52a of the facing portion 52 is maintained above the inner bottom surface of the runner bottom portion 46. At this time, as described above, since the bottom portion 46 of the runner is recessed below the lower entrance forming portion 36, the facing portion 52 and the lower runner forming portion 32 are easily maintained in a separated state. be able to. As a result, the product cavity 12 can be formed satisfactorily by avoiding interference between the upper mold 16 and the lower mold 14 when the mold is closed.

Therefore, according to the casting apparatus 10 and the casting method according to the present embodiment, it is possible to satisfactorily obtain a cast product in which the mixing of foreign matter S is suppressed without hindering the mold closing of the mold 18.

Here, in general, it is desirable to pour the molten metal M into the mold 18 promptly before the molten metal M cools and solidifies, in other words, before the fluidity of the molten metal M decreases. For this reason, although none of them are shown, in general casting equipment, the molten metal M is easily poured into the product cavity by pouring the molten metal directly into the product cavity or enlarging the sprue portion of the mold. Is done. However, in these cases, the molten metal is disturbed at the time of pouring, and air is likely to be entrained, and slag is likely to be generated. Therefore, casting defects are likely to occur in the casting, and the quality may be impaired.

Therefore, it is conceivable to provide a sprue portion having a structure capable of temporarily storing the molten metal M in the mold so that the molten metal can be poured quickly while suppressing the disorder of the molten metal and the generation of slag (for example, JP-A-06-). 269924 (see). However, if the sprue portion has the above structure, the mold becomes large. In addition, since the flow path from the sprue to the product cavity becomes long, there is a concern that the temperature of the molten metal will eventually decrease and the decrease in fluidity cannot be suppressed.

In the casting apparatus 10 according to the present embodiment, the sprue 40 is formed from the lower sprue forming portion 30 provided on the lower mold 14 and the upper sprue forming portion 49 provided on the upper mold 16, whereby the molten metal M is formed. Prompt pouring is possible while suppressing the occurrence of turbulence and slag. Further, it is possible to prevent the mold 18 from becoming large because it is not necessary to provide the sprue portion (not shown) having the above structure with respect to the mold 18. Further, since it is possible to suppress the lengthening of the flow path from the sprue 40 to the product cavity 12, it is possible to suppress a decrease in the temperature of the molten metal M at the time of pouring, and it is possible to maintain good fluidity.

In the casting apparatus 10 according to the above embodiment, the product cavity 12 has an inlet 44 of the molten metal M and a terminal tip portion 54 arranged on the opposite side of the inlet 44 and the product cavity 12 and is driven. The mechanism 20 can rotate the upper mold 16 around a rotation fulcrum P provided closer to the inlet 44 side than the terminal sprue tip portion 54, and by rotating the upper mold 16. The lower end surface 52a of the facing portion 52 is arranged below the upper product cavity forming portion 50 during the molten metal level rising period.

Further, in the casting method according to the above embodiment, the product cavity 12 has an inlet 44 of the molten metal M and a terminal tip portion 54 arranged on the opposite side of the inlet 44 and the product cavity 12. The drive mechanism 20 can rotate the upper mold 16 around a rotation fulcrum P provided closer to the inlet 44 side than the terminal sprue tip portion 54, and the upper mold 16 can be rotated in the molten metal level raising step. By rotating 16, the lower end surface 52a of the facing portion 52 is arranged below the upper product cavity forming portion 50.

In these cases, by rotating the upper mold 16 as described above, the lower end surface 52a of the facing portion 52 can be arranged below the upper product cavity forming portion 50 during the molten metal level rising period. Therefore, it is possible to satisfactorily obtain a cast product in which foreign matter S is suppressed from being mixed in while avoiding obstruction of mold closing of the mold 18 without making a large change in the shape of the upper mold 16.

In the casting apparatus 10 according to the above embodiment, in the drive mechanism 20, the facing portion 52 of the upper mold 16 is the lower mold runner forming portion 32 after the molten metal level rising period and before the product cavity is formed. By rotating the upper die 16 in the direction away from the sprue, the distance between the bottom portion 46 of the runner and the lower end surface 52a of the facing portion 52 is maintained while maintaining the sprue sprue surface Ma above the lower end surface 52a of the facing portion 52. It was decided to set an inflow promotion period that is longer than the period for raising the water level.

Further, in the casting method according to the above embodiment, the upper die 16 is formed in a direction in which the facing portion 52 of the upper die 16 is separated from the lower die runway forming portion 32 between the step of raising the molten metal level and the step of forming the product cavity. By rotating, the inflow that keeps the sprue surface Ma above the lower end surface 52a of the facing portion 52 and makes the distance between the bottom portion 46 of the runner and the lower end surface 52a of the facing portion 52 larger than the sprue level rising period. It was decided to have an inflow promotion process that provides a promotion period.

In these cases, by maintaining the sprue surface Ma above the lower end surface 52a of the facing portion 52, it is possible to prevent foreign matter S floating above the sprue surface Ma from flowing into the lower product cavity forming portion 34 side. can. Further, by rotating the upper mold 16, the amount of molten metal flowing from the sprue 40 to the lower product cavity forming portion 34 side can be increased more than the molten metal level rising period. That is, since the molten metal M can be quickly supplied to the lower product cavity forming portion 34 side, it is possible to prevent the molten metal M from solidifying before reaching the product cavity 12 and causing poor circulation. As a result, it is possible to suppress the occurrence of casting defects and the like in the cast product in which the mixing of foreign matter S is suppressed, so that the cast product can be obtained more satisfactorily.

In the above embodiment, the casting device 10 is provided with the inflow promotion period by rotating the upper mold 16 by the drive mechanism 20, but the present invention is not particularly limited to this. For example, after the sprue level rising period, the upper die 16 is translated upward by the drive mechanism 20, so that the sprue sprue surface Ma is maintained above the lower end surface 52a of the facing portion 52 and is opposed to the bottom portion 46 of the sprue. An inflow promotion period may be provided in which the distance from the lower end surface 52a of the portion 52 is made larger than the molten metal level rising period.

Further, the casting device 10 may form the product cavity 12 by the drive mechanism 20 by closing the mold after the molten metal level rising period without providing the inflow promotion period. That is, the casting method does not have to have an inflow promoting step between the molten metal level rising step and the product cavity forming step.

Further, in the above-described embodiment, the casting device 10 closes the mold by moving the upper mold 16 downward in parallel by the drive mechanism 20, but closes the mold by rotating the upper mold 16. You may. That is, when the mold 18 is closed, the upper mold 16 is tilted so that the facing portion 52 is arranged below the upper product cavity forming portion 50, and the tip side thereof approaches the lower mold 14. It is rotated around the rotation fulcrum P. As a result, the product cavity 12 may be formed between the lower product cavity forming portion 34 and the upper product cavity forming portion 50 which are parallel to each other.

In the casting apparatus 10 according to the above embodiment, the drive mechanism 20 rotates the upper mold 16 to arrange the lower end surface 52a of the facing portion 52 below the upper product cavity forming portion 50 during the molten metal level rising period. However, it is not particularly limited to this. For example, as in the facing portion 68 of the upper mold 64 provided in the casting apparatus 62 of FIGS. 6 to 8, the upper product cavity forming portion 50 is arranged along the lower product cavity forming portion 34 (the upper mold 64 is The lower end surface 68a of the facing portion 68 may be arranged below the upper product cavity forming portion 50 in a state where it is not inclined in the horizontal direction).

The casting apparatus 62 of FIGS. 6 to 8 includes the upper die 64 and the lower die 66 of FIGS. 6 to 8 in place of the upper die 16 and the lower die 14 of FIGS. It can be configured in substantially the same manner as the casting apparatus 10 shown in FIG. As shown in FIG. 6, the upper mold 64 is fixed in the horizontal direction so that the upper product cavity forming portion 50 is along (substantially parallel to) the lower product cavity forming portion 34. That is, the upper mold 64 of the present embodiment is fixed in a state where it is not inclined in the horizontal direction.

Further, the upper mold 64 includes the facing portion 68 shown in FIGS. 6 to 8 in place of the facing portion 52 of the upper mold 16 of FIG. The facing portion 68 projects downward from the upper mold 64. As a result, the lower end surface 68a of the facing portion 68 is arranged below the upper product cavity forming portion 50 even when the upper mold 64 is not inclined with respect to the horizontal direction.

As shown in FIG. 7, the vertical positional relationship between the lower end surface 68a of the facing portion 68 and the upper product cavity forming portion 50 is such that when the pouring into the sprue 40 is completed, the upper product cavity forming portion 50 is different from the molten metal M. It is set to have a non-contact portion 50a to be in contact.

The lower mold 66 of FIGS. 6 to 8 includes a runner bottom 70 instead of the runner bottom 46 of the lower mold 14 of FIG. As described above, the runner bottom 70 is recessed below the runner bottom 46 of FIG. 1 by the amount that the facing portion 68 of the upper die 64 projects downward. Thereby, when the product cavity is formed, the facing portion 68 and the lower mold runner forming portion 32 can be maintained in a state of being well separated.

In the casting method using this casting device 62, first, as shown in FIG. 6, the lower end surface of the facing portion 68 is separated from the facing portion 68 and the lower mold runner forming portion 32 by the drive mechanism 20. The vertical position of 68a is arranged at the same as (including substantially the same) as the lower entrance forming portion 36 or below the lower entrance forming portion 36. Then, for example, the lower mold 66 and the upper mold are used during the period for which the hot water is started to be poured into the sprue 40 via the ladle 56 and the sprue surface Ma reaches above the lower end surface 68a of the facing portion 68. The above arrangement of 64 is maintained.

When a predetermined amount of molten metal M is supplied into the recess 26 of the lower mold 14 by the pouring, the pouring is completed as shown in FIG. The upper product cavity forming portion 50 at the completion of pouring has a non-contact portion 50a that is in non-contact with the molten metal M.

Next, the drive mechanism 20 moves the upper die 64 in the direction of the arrow Y1 in FIG. 7 to approach the lower die 66. As a result, as shown in FIG. 8, the mold 18 is closed while maintaining the vertical position of the lower end surface 68a of the facing portion 68 above the inner bottom surface of the runner bottom portion 70 to form the product cavity 12. Perform the product cavity forming step. When the product cavity is formed, the facing portion 68 is maintained in a state of being separated from the lower mold runner forming portion 32.

As described above, also in the casting device 62 and the casting method using the casting device 62, the foreign matter S is generated by arranging the vertical positions of the lower end surface 68a of the facing portion 68 as described above during the molten metal level rising period. The facing portion 68 can suppress the inflow to the lower product cavity forming portion 34 side. Further, even if the mold 18 is closed to form the product cavity 12, the vertical position of the lower end surface 68a of the facing portion 68 is maintained above the inner bottom surface of the runner bottom portion 70, and the upper mold 64 and the lower end surface 68a are maintained. It is possible to avoid interference with the mold 66. As a result, it is possible to satisfactorily obtain a cast product in which the mixing of foreign matter S is suppressed without hindering the mold closing of the mold 18. Further, in this casting device 62, the configuration of the drive mechanism 20 can be simplified because the upper mold 64 does not need to be rotated by the drive mechanism 20.

As described above, in the casting apparatus 62, the positional relationship between the lower end surface 68a of the facing portion 68 and the upper product cavity forming portion 50 in the vertical direction is such that when the pouring into the sprue 40 is completed, the upper product cavity forming portion 50 changes the molten metal M. It was decided to have a non-contact portion 50a that would be non-contact with. Further, in the casting method using the casting apparatus 62, a non-contact portion 50a that is not in contact with the molten metal M is provided in the upper product cavity forming portion 50 when the pouring into the sprue 40 is completed.

In this case, the heat of the molten metal M is suppressed from being taken away by the upper mold 64 because a gap is formed between the molten metal M supplied to the lower product cavity forming portion 34 side and the upper product cavity forming portion 50. can. As a result, it is possible to prevent the temperature of the molten metal M from dropping between the start of pouring and the closing of the mold. It is possible to suppress an increase in the pressure of the molten metal M applied to the mold 18. As a result, while pressing the molten metal M between the lower product cavity forming portion 34 and the upper product cavity forming portion 50, the lower mold 66 and the upper mold 64 are brought close to the position where the product cavity 12 is well formed and cast. It becomes possible to obtain a good product.

In the casting apparatus 62 of FIGS. 6 to 8 and the casting method using the casting apparatus 62, after the molten metal level rising period, the mold is closed to form the product cavity 12 without providing the inflow promotion period. However, as in the casting apparatus 72 shown in FIGS. 9 to 11, an inflow promotion period may be provided. That is, the casting device 72 maintains the sprue sprue surface Ma above the lower end surface 68a of the facing portion 68 after the sprue level rising period by the drive mechanism 20 until the product cavity is formed. An inflow promotion period is provided in which the distance between the bottom portion 70 of the runner and the lower end surface 68a of the facing portion 68 is made larger than the rise level of the runner. Except for this point, the casting apparatus 72 of FIGS. 9 to 11 can be configured in the same manner as the casting apparatus 62 of FIGS. 6 to 8.

In the casting method using the casting device 72, first, as shown in FIG. 9, the upper mold 64 is translated with respect to the lower mold 66 by the drive mechanism 20, and the facing portion 68 and the lower mold runner are formed. With the portion 32 separated, the vertical position of the lower end surface 68a of the facing portion 68 is arranged substantially the same as the lower entrance forming portion 36 or below the lower entrance forming portion 36. Then, for example, the lower mold 66 and the upper mold are used during the period for which the hot water is started to be poured into the sprue 40 via the ladle 56 and the sprue surface Ma reaches above the lower end surface 68a of the facing portion 68. The above arrangement of 64 is maintained.

Next, the drive mechanism 20 translates the upper mold 64 in the direction in which the facing portion 68 of the upper mold 64 is separated from the lower mold runner forming portion 32 (in the direction of arrow Y2 in FIG. 9). As a result, as shown in FIG. 10, while maintaining the sprue hot water surface Ma above the lower end surface 68a of the facing portion 68, the distance between the runner bottom 70 and the lower end surface 68a of the facing portion 68 is set from the sprue level rising period. The inflow promotion process is carried out by increasing the size and providing an inflow promotion period. As a result, the amount of molten metal flowing from the sprue 40 to the lower product cavity forming portion 34 side can be increased more than the molten metal level rising period, and the molten metal M can be quickly supplied to the lower product cavity forming portion 34 side. Become. This inflow promoting step may be performed after the pouring of hot water into the sprue 40 is completed, or may be performed while pouring hot water.

Next, the drive mechanism 20 translates the upper die 64 in the direction of arrow Y3 in FIG. As a result, as shown in FIG. 11, the mold 18 is closed and the product cavity 12 is closed while maintaining the vertical position of the lower end surface 68a of the facing portion 68 above the inner bottom surface of the runner bottom portion 70. Perform the product cavity forming step to be formed.

Also in this casting method, by arranging the vertical positions of the lower end surface 68a of the facing portion 68 in the vertical direction as described above during the molten metal level rising period, the foreign matter S is opposed to flowing into the lower product cavity forming portion 34 side. It can be suppressed by the part 68. Further, even if the mold 18 is closed to form the product cavity 12, the vertical position of the lower end surface 68a of the facing portion 68 is maintained above the inner bottom surface of the runner bottom portion 70, and the upper mold 64 and the lower end surface 68a are maintained. It is possible to avoid interference with the mold 66. As a result, it is possible to satisfactorily obtain a cast product in which the mixing of foreign matter S is suppressed without hindering the mold closing of the mold 18.

As described above, in the casting apparatus 72, the drive mechanism 20 maintains the sprue sprue surface Ma above the lower end surface 68a of the facing portion 68 after the sprue level rising period and until the product cavity is formed. At the same time, it was decided to provide an inflow promotion period in which the distance between the bottom 70 of the runner and the lower end surface 68a of the facing portion 68 is made larger than the rise period of the molten metal. Further, in the casting method using the casting apparatus 72, the sprue sprue surface Ma is maintained above the lower end surface 68a of the facing portion 68 between the sprue level raising step and the product cavity forming step, and the sprue bottom portion 70 and the sprue bottom portion 70 are maintained. It was decided to have an inflow promoting step of providing an inflow promoting period in which the distance of the facing portion 68 from the lower end surface 68a is larger than that of the molten metal level rising step.

In this case, during the sprue level rising period, the sprue sprue surface Ma can be quickly raised above the lower end surface 68a of the facing portion 68 to prevent the foreign matter S from flowing into the lower product cavity forming portion 34 side. Further, during the inflow promotion period, the molten metal M can be quickly supplied to the lower product cavity forming portion 34 side while suppressing the inflow of the foreign matter S. As a result, it becomes possible to satisfactorily obtain a cast product in which foreign matter S is mixed and casting defects are suppressed.

In the casting devices 10, 62, and 72 according to the above embodiment, the separation distance between the facing portions 52, 68 and the lower mold runner forming portion 32 is maintained at a size that allows the molten metal M to flow. Further, in the casting method according to the above embodiment, the distance between the facing portions 52 and 68 and the lower mold runner forming portion 32 is set to a size that enables the molten metal M to flow from the start of pouring to the time of forming the product cavity. I decided to keep it. In these cases, since the molten metal M can be suppressed from solidifying between the facing portions 52 and 68 and the lower mold runner forming portion 32, the mold closing between the upper molds 16 and 64 and the lower molds 14 and 66 is hindered. This can be suppressed more effectively.

The present invention is not particularly limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof.

For example, as in the casting apparatus 74 shown in FIGS. 12 and 13, the upper mold 76 of FIGS. 12 and 13 may be provided instead of the upper mold 64 of FIGS. 6 to 8. The upper mold 76 can be configured in the same manner as the upper mold 64 of FIGS. 6 to 8 except that it has an advancing / retreating portion 78 that can advance / retreat relative to the inside of the lower sprue forming portion 30. .. The advancing / retreating portion 78 is provided on the upper mold 76 so as to bulge toward the inside of the lower mold sprue forming portion 30, for example.

Further, in the drive mechanism 20 of the casting device 74, the advancing / retreating portion 78 approaches the sprue 40 side as the upper die 76 moves downward in a direction in which the casting device 74 is inclined with respect to the vertical direction (FIG. 13). As the 76 moves upward, the upper mold 76 can be moved along the direction in which the advancing / retreating portion 78 is separated from the sprue 40 side (FIG. 12).

That is, as shown in FIG. 13, when the upper mold 76 is brought closer to the lower mold 66 along the above-mentioned inclination direction by the drive mechanism 20, that is, when the upper mold 76 is moved in the arrow Z direction (mold closing direction). The volume of the lower sprue forming portion 30 is reduced by the amount that the advancing / retreating portion 78 enters the lower sprue forming portion 30. Further, when the upper die 64 is separated from the lower die 66 by the drive mechanism 20 along the above-mentioned inclination direction, as shown in FIG. The volume of the forming portion 30 increases.

When the volume of the lower mold sprue forming portion 30 (sluice 40) is reduced as described above, it is preferable that the volume of the lower sprue forming portion 32 (runner 42) is also reduced. Further, when the volume of the lower type sprue forming portion 30 (sprue 40) is increased, it is preferable that the volume of the lower type sprue forming portion 32 (runner 42) is also increased.

From the viewpoint of more effectively avoiding interference between the upper die 76 and the lower die 66, the moving direction of the upper die 76 is located in the vicinity of the lower entrance forming section 36 of the lower die runner forming section 32. A lower inclined portion 80 extending along the above may be provided. Further, the facing portion 68 of the upper mold 76 may be provided with an upper inclined portion 82 extending along the above-mentioned moving direction of the upper mold 76 at a portion facing the lower inclined portion 80 of the lower mold 66. good.

In the casting method using this casting device 74, first, as shown in FIG. 12, the upper mold 76 is separated from the lower side along the above-mentioned inclination direction by the drive mechanism 20, and the volume of the lower mold sprue forming portion 30 is formed. To increase. Further, with the facing portion 68 and the lower runner forming portion 32 separated from each other, the vertical position of the lower end surface 68a of the facing portion 68 is the same as (including substantially the same) or the lower side of the lower entrance forming portion 36. It is arranged below the entrance forming portion 36.

Then, for example, the lower mold 66 and the upper mold are used during the period for which the hot water is started to be poured into the sprue 40 via the ladle 56 and the sprue surface Ma reaches above the lower end surface 68a of the facing portion 68. The above arrangement of 76 is maintained.

When a predetermined amount of molten metal M is supplied into the recess 26 of the lower mold 66, the product cavity forming step is performed. In the product cavity forming step, the drive mechanism 20 moves the upper die 64 in the direction of arrow Z in FIG. 12 to approach the lower die 66. As a result, as shown in FIG. 13, the volume of the lower mold sprue forming portion 30 is smaller than that at the start of pouring, and the vertical position of the lower end surface 68a of the facing portion 68 is set from the inner bottom surface of the runner bottom 70. The mold 18 is closed while maintaining the upper part, and the product cavity forming step of forming the product cavity 12 is performed.

As described above, also in the casting device 74 and the casting method using the casting device 74, the foreign matter S is generated by arranging the vertical positions of the lower end surface 68a of the facing portion 68 as described above during the molten metal level rising period. The facing portion 68 can suppress the inflow to the lower product cavity forming portion 34 side. Further, even if the mold 18 is closed to form the product cavity 12, the vertical position of the lower end surface 68a of the facing portion 68 is maintained above the inner bottom surface of the runner bottom 70, and is below the upper mold 76. It is possible to avoid interference with the mold 66. As a result, it is possible to satisfactorily obtain a cast product in which the mixing of foreign matter S is suppressed without hindering the mold closing of the mold 18.

Further, in the casting device 74 and the casting method using the casting device 74, the volumes of the lower mold sprue forming portion 30 and the lower mold runner forming portion 32 can be made larger than those at the time of closing the mold at the start of pouring. As a result, it is possible to prevent the molten metal M from being deprived of heat by the mold 18 and lowering in temperature. Further, it is possible to prevent the time required for supplying the molten metal M to the lower product cavity forming portion 34 via the sprue 40 and the runner 42 from becoming long. As a result, it is possible to more effectively suppress that the molten metal M solidifies before reaching the product cavity 12 to cause poor rotation of the molten metal and that the pressure of the molten metal M applied to the mold 18 rises.

On the other hand, when the mold is closed, the volume of the lower mold sprue forming portion 30 and the lower mold runner forming portion 32 is reduced as compared with the time when the pouring is started, so that the volume of the plan portion of the finally obtained cast product can be reduced. can. As a result, the casting weight of the molten metal M (the weight of the total molten metal M supplied to the recess 26) with respect to the weight of the cast product can be reduced to improve the yield.

The upper mold 16 of the casting apparatus 10 of FIGS. 1 to 5 may also be provided with an advancing / retreating portion (not shown), similarly to the advancing / retreating portion 78 of the upper mold 76 of FIGS. In the product cavity forming step of the casting method using the casting device 10, the upper die 16 is brought closer to the lower die 14 along the above-mentioned inclination direction, so that the lower die sprue forming portion 30 and the lower die than at the start of pouring. The volume of the mold runner forming portion 32 may be reduced.

In the above embodiment, the discharge 48 is provided so as to surround the outer peripheral edge of the product cavity 12, but the present invention is not particularly limited to this. The discharge 48 may be provided intermittently surrounding the outer peripheral edge of the product cavity 12, or may be partially provided on the outside of the product cavity 12.

10, 62, 72, 74 ... Casting device 12 ... Product cavities 14, 66 ... Lower mold 16, 64, 76 ... Upper mold 18 ... Mold 20 ... Drive mechanism 30 ... Lower mold sprue forming part 32 ... Lower mold sprue forming part 32 ... Lower mold sprue forming part 34 ... Lower product cavity forming part 36 ... Lower entrance forming part 40 ... Gate 42 ... Channel 44 ... Inlet 46, 70 ... Channel bottom 50 ... Upper product cavity forming part 50a ... Non-contact part 52, 68 ... Opposing part 52a, 68a ... Lower end surface 54 ... Terminal sprue tip 78 ... Advancing / retreating part F ... Inflow direction M ... Molten metal Ma ... Sprue sprue surface P ... Rotation fulcrum θ ... Angle

Claims (16)

A mold having a lower mold and an upper mold capable of forming a product cavity, and a drive mechanism for relatively moving the lower mold and the upper mold are provided, and a molten metal is pressed between the lower mold and the upper mold. It is a casting machine that closes the mold while
The lower mold has a lower sprue forming portion that forms a sprue extending vertically, a lower sprue forming portion that forms a sprue communicating with the sprue, and the molten metal via the sprue and the sprue. Has a lower product cavity forming portion to which the product is supplied and a lower inlet forming portion forming the inlet of the molten metal in the product cavity.
The lower type runner forming portion has a runner bottom portion arranged below the lower entrance forming portion.
The upper mold includes an upper mold sprue forming portion that forms the sprue together with the lower sprue forming portion, an upper product cavity forming portion capable of forming the product cavity between the lower product cavity forming portion, and the upper product cavity forming portion. It has an opposing portion that can face the bottom of the runner along the mold closing direction of the mold.
The drive mechanism is in the facing portion and the lower portion during the period of rising of the sprue level from the start of pouring into the sprue until the sprue sprue surface of the molten metal in the sprue reaches above the lower end surface of the facing portion. With the mold runner forming portion separated, the vertical position of the lower end surface of the facing portion is lower than the upper product cavity forming portion and is the same as or the lower side of the lower entrance forming portion. Placed below the entrance forming part,
A casting device that maintains the vertical position of the lower end surface of the facing portion above the inner bottom surface of the runner bottom portion when the product cavity is formed. In the casting apparatus according to claim 1,
The product cavity has the inlet of the molten metal and a terminal tip portion arranged on the opposite side of the inlet and the product cavity.
The drive mechanism can rotate the upper mold around a rotation fulcrum provided closer to the inlet side than the terminal sprue portion, and by rotating the upper mold, the upper mold can be rotated. A casting apparatus for arranging the lower end surface of the facing portion below the upper product cavity forming portion during the molten metal level rising period. In the casting apparatus according to claim 1,
A casting apparatus in which the facing portion projects downward from the upper mold so that the lower end surface of the facing portion is arranged below the upper product cavity forming portion. In the casting apparatus according to claim 3,
The vertical positional relationship between the lower end surface of the facing portion and the upper product cavity forming portion is such that the upper product cavity forming portion is in non-contact with the molten metal when pouring into the sprue is completed. Casting equipment set to have. In the casting apparatus according to any one of claims 1 to 4.
The drive mechanism is connected to the bottom of the runner while maintaining the sprue surface above the lower end surface of the facing portion until after the sprue level rising period and until the product cavity is formed. A casting apparatus provided with an inflow promoting period in which the distance between the facing portion and the lower end surface is made larger than the molten metal level rising period. In the casting apparatus according to claim 2,
The drive mechanism moves the upper mold in a direction in which the facing portion of the upper mold is separated from the lower mold runner forming portion after the molten metal level rising period and before the product cavity is formed. By rotating the sprue surface, the distance between the bottom of the runner and the lower end surface of the facing portion is made larger than the sprue level rising period while maintaining the sprue sprue surface above the lower end surface of the facing portion. Casting equipment that provides an inflow promotion period. In the casting apparatus according to any one of claims 1 to 6.
A casting apparatus in which the distance between the facing portion and the lower mold runner forming portion is maintained at a size that allows the molten metal to flow. In the casting apparatus according to any one of claims 1 to 7.
The lower mold sprue forming portion forms the sprue on the outer side of the upper mold in a top view.
The upper mold is provided with an advancing / retreating portion capable of advancing / retreating inside the lower sprue forming portion.
The drive mechanism brings the upper mold closer to the lower mold along the direction in which the advancing / retreating portion enters the lower mold sprue forming portion when the mold is closed, so that the volume of the lower mold sprue forming portion is formed. A casting device that reduces the amount of water from the start of pouring. A mold having a lower mold and an upper mold capable of forming a product cavity, and a drive mechanism for relatively moving the lower mold and the upper mold are provided, and a molten metal is pressed between the lower mold and the upper mold. It is a casting method using a casting device that closes the mold while closing the mold.
The lower mold has a lower sprue forming portion that forms a sprue extending vertically, a lower sprue forming portion that forms a sprue communicating with the sprue, and the molten metal via the sprue and the sprue. Has a lower product cavity forming portion to which the product is supplied and a lower inlet forming portion forming the inlet of the molten metal in the product cavity.
The lower type runner forming portion has a runner bottom portion arranged below the lower entrance forming portion.
The upper mold includes an upper mold sprue forming portion that forms a sprue together with the lower sprue forming portion, an upper product cavity forming portion capable of forming the product cavity between the lower product cavity forming portion, and the mold. It has an opposing portion that can face the bottom of the runner along the mold closing direction of the mold.
The casting method is
During the period of rising of the sprue level from the start of pouring into the sprue until the sprue surface of the molten metal in the sprue reaches above the lower end surface of the facing portion, the facing portion and the lower mold channel forming portion The vertical position of the lower end surface of the facing portion is lower than the upper product cavity forming portion and is the same as or lower than the lower entrance forming portion. The hot water level rising process to be placed in
A product that forms the product cavity by closing the mold while maintaining the vertical position of the lower end surface of the facing portion above the inner bottom surface of the runner bottom portion after the molten metal level raising step. Cavity formation process and
Has a casting method. In the casting method according to claim 9,
The product cavity has the inlet of the molten metal and a terminal tip portion arranged on the opposite side of the inlet and the product cavity.
The drive mechanism can rotate the upper mold around a rotation fulcrum provided closer to the inlet side than the terminal tip portion.
In the molten metal level raising step, a casting method in which the lower end surface of the facing portion is arranged below the upper product cavity forming portion by rotating the upper mold. In the casting method according to claim 9,
A casting method in which the facing portion projects downward from the upper mold so that the lower end surface of the facing portion is arranged below the upper product cavity forming portion. In the casting method according to claim 11,
A casting method in which a non-contact portion that is in non-contact with the molten metal is provided in the upper product cavity forming portion when pouring into the sprue is completed. In the casting method according to any one of claims 9 to 12,
The distance between the bottom of the runner and the lower end surface of the facing portion while maintaining the sprue surface above the lower end surface of the facing portion between the molten metal level raising step and the product cavity forming step. A casting method comprising an inflow promotion step of providing an inflow promotion period in which the temperature rises above the molten metal level. In the casting method according to claim 10,
The sprue surface of the sprue is formed by rotating the upper die in a direction in which the facing portion of the upper die is separated from the lower die forming section between the step of raising the sprue level and the step of forming the product cavity. It has an inflow promotion step of providing an inflow promoting period in which the distance between the bottom of the runner and the lower end surface of the facing portion is made larger than the molten metal level rising period while maintaining above the lower end surface of the facing portion. , Casting method. In the casting method according to any one of claims 9 to 14,
A casting method in which the distance between the facing portion and the lower mold runner forming portion is maintained at a size that allows the molten metal to flow from the start of pouring to the formation of the product cavity. In the casting method according to any one of claims 9 to 15,
The lower mold sprue forming portion forms the sprue on the outer side of the upper mold in a top view.
The upper mold is provided with an advancing / retreating portion capable of advancing / retreating relative to the inside of the lower sprue forming portion.
In the product cavity forming step, the upper mold is brought closer to the lower mold along the direction in which the advancing / retreating portion enters the lower mold sprue forming portion, so that the product cavity is formed after the product cavity is formed rather than at the start of pouring. A casting method for reducing the volume of the lower sprue forming portion.

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