JP6701131B2 - Back plate for mold attachment and molding machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a back plate for attaching a mold and a molding machine .

  For example, so-called blow molding is widely used to manufacture hollow molded articles such as plastic bottles. In blow molding, a molten resin (preform or parison) is sandwiched between two mold halves, the resin is inflated with compressed air, and a hollow molded product is taken out from the mold after cooling.

  The mold is attached to a platen, which is an attachment portion of the blow molding machine, through a back plate (also referred to as “mounting plate”). The mold is different depending on the shape of the molded product, and the mold attached to the blow molding machine is replaced every time a molded product having a different shape is manufactured.

  Since heat is conducted from the molten resin to this mold, it is necessary to form a molded product and cool the mold.

  For example, Patent Document 1 discloses a mold in which a medium inflow port, a medium outflow port, and a cooling tank are formed and a cooling medium flows. In the mold described in Patent Document 1, the cooling tank is closed by the back plate, and the cooling medium flowing in from the medium inlet flows out from the medium outlet while removing heat from the mold member. Achieves effective mold cooling.

JP, 2011-136424, A

  However, the mold through which the cooling medium flows requires additional operations such as attaching or detaching pipes (hoses) to the inlet and the outlet of the cooling medium each time the blow molding machine is replaced. Also, the back plate is replaced together with the mold. Such replacement work may take several hours, for example, but in the case of so-called multi-lot production, in which a large number of molded products are produced, there is no problem because the work ratio relative to the entire production process is relatively small.

  On the other hand, in the case of producing a small number of molded products, that is, so-called small lot production, for example, in the case of performing die replacement work every day, the ratio of the die replacement work to the entire manufacturing process becomes relatively large. For this reason, it is desired to quickly perform the die replacement work especially when small-lot production is performed.

The present invention has been made in view of the above circumstances , and provides a back plate for attaching a mold and a molding machine that can quickly perform a work of exchanging a mold attached to the molding machine. With the goal.

In order to solve the above-mentioned problems, a back plate for mounting a mold of the present invention is a mold which is arranged between a molding machine and a mold and is used for mounting a half-divided mold to the molding machine. A back plate for attachment, which is formed between a first surface to be attached to the molding machine, a second surface to which a mold having no cooling channel is attached, and a first surface and a second surface. A cooling channel. A groove extending in the vertical direction is formed in one of the mold and the second surface, and a protrusion extending in the vertical direction and fitted into the groove is formed in the other .

It is preferable that the second surface has a concave shape in which the mold is fitted, and the cooling flow path extends from one side surface to the other side surface along the concave shape of the mold. The concave shape of the second surface may be semi-circular so that a mold having a semi-circular back surface is fitted therein.

A back plate for mounting a mold of the present invention is a back plate for mounting a mold which is disposed between a molding machine and a mold and is used for mounting a half-molded mold on the molding machine. A first surface attached to the molding machine, a second surface to which a mold in which a cooling channel for the cooling medium is not formed is attached, and a cooling channel formed between the first surface and the second surface , Is provided. The second surface is formed with a semi-circular concave shape into which a semi-circular mold having a back surface attached to the second surface is fitted, and the cooling flow passage has the concave shape from one side surface toward the other side surface. It extends along the shape .

The mold has a semi-circular back surface with a stable portion that stabilizes when placed with the back surface down, and the second surface has a fitting portion with which the stable portion is fitted. Good.

A smooth surface may be formed on the top of the semicircular back surface of the mold, and the second surface may be formed with a smooth surface whose position matches the position of the smooth surface of the mold. Moreover, a concave shape may be formed on the top of the semicircular back surface of the mold, and a fitting portion that fits into the concave shape of the mold may be formed on the second surface.

The cooling flow passage has an inlet and an outlet for the cooling medium formed on the side surface, and has a flow passage portion extending in the lateral direction and a flow passage portion extending in a direction intersecting the vertical direction and the horizontal direction. It is preferable to have.

It is preferable that a protrusion on which the mold and the mold mounting back plate are placed is formed to extend laterally on the surface of the molding machine on which the mold is mounted.

A mold having only one mold of the molded article may be attached to the second surface. The molding machine may be a blow molding machine.

The molding machine of the present invention is divided into halves, a mold in which a cooling channel is not formed, a platen to which the mold is attached, a back plate arranged between the mold and the platen, and a metal platen. A protrusion that is formed to extend in the lateral direction and on which the mold and the back plate are placed is provided on the surface on the side where the mold is attached. The back plate has a first surface attached to the platen, a second surface to which a mold is attached, and a cooling flow path formed between the first surface and the second surface. A groove extending in the vertical direction is formed in one of the mold and the second surface, and a protrusion extending in the vertical direction and fitted into the groove is formed in the other.

The molding machine of the present invention is divided into halves, a mold in which a cooling channel is not formed, a platen to which the mold is attached, a back plate arranged between the mold and the platen, and a metal platen. A protrusion that is formed to extend in the lateral direction and on which the mold and the back plate are placed is provided on the surface on the side where the mold is attached. The back plate has a first surface attached to the platen, a second surface to which a mold is attached, and a cooling flow path formed between the first surface and the second surface. The mold has a semi-circular back surface attached to the second surface, the second surface is formed with a circular concave shape into which the mold is fitted, and the cooling flow passage extends from one side surface to the other side surface. , Extending along the concave shape.

  According to the present invention, there is an effect that the work of exchanging the mold attached to the molding machine can be performed quickly.

It is a schematic diagram of a hollow molded article manufacturing device concerning an embodiment of the present invention. FIG. 3 is a schematic view of a back plate and a mold according to the first embodiment of the present invention. It is a schematic diagram showing a blow molding process concerning a 1st embodiment of the present invention. It is a schematic diagram of a backboard and metal mold concerning a 2nd embodiment of the present invention. It is a schematic diagram of the backboard and metal mold concerning a 3rd embodiment of the present invention. It is an enlarged view of a back plate and a mold concerning a modification of a 3rd embodiment of the present invention.

  An embodiment of a back plate for attaching a mold, a mold, and a mold exchanging method according to the present invention will be described below with reference to the drawings.

[1. First Embodiment]
Hereinafter, the first embodiment of the present invention will be described.

[1-1. Configuration of hollow molded product manufacturing equipment]
FIG. 1 is a schematic diagram of a hollow molded article manufacturing apparatus 10 according to the present embodiment. The hollow molded product manufacturing apparatus 10 manufactures a molded product 12 such as a plastic bottle.

  The hollow molded article manufacturing apparatus 10 includes an injection molding machine 14, a temperature adjusting machine 16, and a blow molding machine 18. The blow molding machine 18 is, for example, an injection blow molding machine. In general, the injection blow molding machine is suitable for mass production of the molded product 12 (multi-lot production).

  The injection molding machine 14 performs a step of injection molding a preform 20 which is a test tube-shaped molded product (hereinafter referred to as "preform molding step"). The molded preform 20 is inserted into the pedestal and conveyed by the conveyor 22 to the temperature controller 16. The temperature adjuster 16 includes a heater zone and performs heating, which is temperature adjustment, so that the preform exhibits plasticity. The material of the preform 20 is, for example, polyethylene terephthalate or polypropylene.

  The temperature-controlled preform 20 is conveyed to the blow molding machine 18 by the conveyor 22. The blow molding machine 18 performs a step of sandwiching the temperature-adjusted preform 20 in a mold and then inflating it with high-pressure compressed air to obtain a molded article 12 (biaxial stretch blow molding, hereinafter referred to as "blow molding step"). ..

  As described above, the hollow molded article manufacturing apparatus 10 according to the present embodiment is a two-step system in which the preform molding step as the first step and the blow molding step as the second step are performed by different molding machines.

[1-2. Structure of back plate and mold according to this embodiment]
The structures of the back plate 30A and the mold 40A according to the present embodiment will be described with reference to FIG. 2A is a front view of the back plate 30A attached to the platen 24 of the blow molding machine 18, and FIG. 2B is a top view of the platen 24, the back plate 30A, and the mold 40A.

  The back plate 30A is arranged between the blow molding machine 18 (platen 24) and the mold 40A, and is used to attach the half-molded mold 40A to the blow molding machine 18. That is, the mold 40A is attached to the platen 24 via the back plate 30A. Joining of the back plate 30A to the platen 24 and joining of the mold 40A to the back plate 30A are performed by screws as an example.

  Here, the conventional mold is provided with a cooling flow path for cooling the heat transferred by the contact of the heated preform 20. When manufacturing the molded product 12 having a different shape, it is necessary to replace the mold attached to the blow molding machine 18. Therefore, every time the mold is replaced, additional work such as attaching or detaching the hose to the inlet and outlet of the cooling medium is required. Further, the back plate is also replaced with one suitable for the mold, depending on the thickness of the mold. For these reasons, it may take several hours to replace the mold. Incidentally, in the past, the back plate and the mold may be collectively referred to as a mold.

  Then, when a small number of molded products 12 are manufactured (hereinafter referred to as "small lot production") such that the mold is replaced every day, the mold and the back plate are replaced for all the manufacturing processes. The work rate becomes relatively large. Furthermore, since the mold is a heavy object, the replacement work requires manpower and mechanical equipment. As described above, particularly in small-lot production, the work of exchanging the mold and the back plate affects the manufacturing efficiency of the molded product 12.

  Therefore, the back plate 30A according to the present embodiment includes the first surface 32 attached to the blow molding machine 18 (platen 24), the second surface 34 attached with the mold 40A, and the first surface 32 and the second surface 34. And a cooling flow path 36 through which the cooling medium flows. As an example, the first surface 32 and the second surface 34 are surfaces facing each other, and the cooling medium is water. The path of the cooling flow path 36 shown in FIG. 2 is an example, and the present invention is not limited to this.

  A mold 43 of the molded product 12 (broken line in FIG. 2, also referred to as a cavity) is formed on the front surface 42 of the mold 40A. The back surface 44 of the mold 40A, which faces the front surface 42, is attached so as to abut the second surface 34 of the back plate 30A. Further, no cooling flow path is formed in the mold 40A according to this embodiment.

  The back plate 30A and the mold 40A are formed of a material having excellent thermal conductivity such as aluminum. As a result, the cooling efficiency for the back plate 30A and the mold 40A is increased as compared with the conventional case. As will be described later in detail, when the mold 40A is replaced, the back plate 30A is not replaced, so the thickness of the mold 40A is designed in consideration of the thickness of the back plate 30A.

  The cooling passage 36 formed in the back plate 30A has an inlet 36i through which the cooling medium flows in and an outlet 36o through which the cooling medium flows out, and the mold 40A is kept at a predetermined temperature (for example, 15 to 20° C.) by the cooling medium. Cool to Further, the inflow port 36i and the outflow port 36o are arranged vertically in the side surface 38 of the back plate 30A, but the invention is not limited to this. The inflow port 36i and the outflow port 36o are provided with a joint 50, and a pipe 52 is attached to the joint 50.

  The platen 24 is provided with a protrusion 26 that defines the positions of the back plate 30A and the mold 40A in the vertical direction in the horizontal direction. Further, on the second surface 34 of the back plate 30A, a protrusion 39 for defining the horizontal position of the mold 40A is formed in the vertical direction. On the other hand, a guide groove 46 fitted to the protrusion 39 is formed on the back surface 44 of the mold 40A.

  That is, the back plate 30A is attached to the platen 24 so as to be placed on the upper surface of the protrusion 26. The mold 40A is placed on the upper surface of the protrusion 26 of the platen 24, and is attached so that the guide groove 46 is fitted to the protrusion 39 of the back plate 30A. As a result, the mold 40A is easily attached to the back plate 30A so that the vertical and horizontal positions thereof are predetermined positions.

  Further, in the mold 40A, only one mold 43 of the molded product 12 is formed, and the guide groove 46 is provided for each mold 40A. The guide groove 46 may be formed on the second surface 34 of the back plate 30A, and the protrusion 39 may be provided on the mold 40A.

  In addition, in the example of FIG. 2, two molds 40A are attached to the back plate 30A, but the present invention is not limited to this, and the back plate 30A has one or more molds 40A. May be Further, a plurality of guide grooves 46 may be formed in the mold 40A, and the protrusion 39 may be formed on the back plate 30A so that the plurality of guide grooves 46 are fitted together.

[1-3. Blow molding process]
FIG. 3 is a schematic view showing a blow molding process by the blow molding machine 18 according to the present embodiment. As shown in FIG. 3, the front faces 42 of the mold 40</b>A, which is cut in half, are arranged so as to be in contact with each other with the preform 20 sandwiched therebetween. Therefore, one or both of the molds 40A move in parallel with the back plate 30A and the platen 24 and are brought into contact with and integrated with the other mold 40A at the front faces 42. In FIG. 3, as an example, the mold 40A below the paper surface, the back plate 30A, and the platen 24 (hereinafter collectively referred to as "moving mold 60A") move in parallel, and the mold 40A above the paper surface and the back plate 30A. , And the platen 24 (hereinafter collectively referred to as “fixed mold 60B”) do not move.

  Then, when performing blow molding, the preform 20 is moved to the position of the mold 40A by the conveyor 22. After that, the movable mold 60A moves in the direction of the fixed mold 60B (arrow A), so that the preform 20 is sandwiched between the fixed mold 60B and the movable mold 60A. The blow molding machine 18 blows compressed air onto the preform 20 sandwiched between the molds 40</b>A that are integrated by abutting the front faces 42. The preform 20 expands when compressed air is blown into it, and is pressed against the mold 40</b>A to form the molded product 12.

  The cooling medium is flown into the cooling flow path 36 formed in the back plate 30A through the pipe 52, so that the mold 40A is continuously cooled in the blow molding process. That is, although the preform 20 is heated by the temperature controller 16, it is formed into the shape of the molded product 12 and cooled by the cooled mold 40A and the compressed air blown therein.

  When the blow molding is completed, the moving die 60A moves in a direction (arrow B) away from the fixed die 60B. Then, the formed molded product 12 is discharged from the blow molding machine 18 by the conveyor 22.

[1-4. Mold exchange method according to this embodiment]
As described above, in the conventional mold, the back plate is replaced with the replacement of the mold. Since the mold and the back plate are heavy, it is difficult to perform the replacement work by one person, and the replacement work has been performed by a plurality of people or a working machine such as a crane. Further, since a cooling flow path is formed in the conventional mold, it is necessary to attach and remove the pipe connected to the cooling flow path, which requires a working time.

  On the other hand, the mold replacement method according to the present embodiment removes the mold 40A from the back plate 30A without removing the back plate 30A from the blow molding machine 18, and removes the mold 40A from the back plate 30A. Install a new mold 40A.

  As described above, the back plate 30A according to the present embodiment is not replaced with the replacement of the mold 40A. That is, the back plate 30A remains fixed to the platen 24. Therefore, the weight of the back plate 30A does not affect the working time in the replacement work of the mold 40A. Further, since the cooling flow passage 36 is formed in the back plate 30A and the cooling flow passage is not formed in the mold 40A, work on the cooling flow passage 36 becomes unnecessary even when the mold 40A is replaced.

  Further, in the conventional mold, since a plurality of molds are formed in one mold and a cooling flow path is formed, it is realistic to divide each mold into a single mold even if it is a heavy object. Was not. Furthermore, in multi-lot production, since the die replacement work does not occur frequently, even a large die replacement work in which a plurality of molds are formed has not been a problem.

  On the other hand, the mold 40A according to the present embodiment is premised on small-lot production, and since the cooling flow path is not formed, it is divided and formed for each one mold 43. Therefore, the mold 40A according to the present embodiment has a small weight (for example, several kg) and does not require a plurality of persons or working machines, and can be replaced by one person. Further, in the present embodiment, since the cooling passage is not formed in the mold 40A, the manufacturing cost of the mold 40A is reduced.

  Further, in the conventional mold, the guide groove 46 is not formed, and the position adjustment when mounting on the back plate is performed by a skilled worker. On the other hand, in the mold 40A according to the present embodiment, the mold 40A is attached from above the back plate 30A so that the guide groove 46 is fitted into the protrusion 39 formed on the back plate 30A. As a result, in this embodiment, the lateral alignment of the mold 40A can be easily and accurately performed by a skilled worker.

  As described above, the back plate 30A according to the present embodiment has the first surface 32 attached to the blow molding machine 18 and the second surface 34 attached to the mold 40A, and the cooling flow path 36 is the first. It is formed between the surface 32 and the second surface 34. Even when the mold 40A is replaced, the back plate 30A is not replaced, and the mold 40A does not have a cooling flow path. Can be done quickly.

  Therefore, by applying the back plate 30A and the mold 40A according to the present embodiment to the blow molding machine 18 that performs small lot production, the ratio of the replacement work of the mold 40A to the entire manufacturing process is relatively higher than that of the conventional one. Since the size is reduced, the efficiency of small lot production is improved as compared with the conventional one. Furthermore, by applying the back plate 0A and the mold 40A according to the present embodiment to an injection blow molding machine suitable for multi-lot production, highly efficient small-lot production is possible.

  In addition, at the same time that the molded product 12 is formed by the mold 40A, the molded product 12 may be labeled (hereinafter referred to as "in-mold labeling"). In the in-mold labeling, a label is previously placed on the mold 43 of the mold 40A, the preform 20 is formed on the molded product 12, and at the same time, the adhesive applied to the label is melted to bond the label to the molded product 12. Therefore, in the mold 40A, a heater is formed in a region where the label is arranged, and the heater heats the label. Since the mold 40A according to the present embodiment is cooled by the cooling flow passage 36 formed in the back plate 30A, the position of the cooling flow passage 36 and the position of the heater are separated. Therefore, in the mold 40A according to the present embodiment, it is easier to perform heating control using a heater, more specifically, partial heating control, as compared with the related art. As a result, for example, it becomes possible to attach a label to a local area, control the degree of glue applied to the label, and the like.

[2. Second Embodiment]
The second embodiment of the present invention will be described below.

  The configuration of the hollow molded product manufacturing apparatus 10 according to the present embodiment is the same as the configuration of the hollow molded product manufacturing apparatus 10 according to the first embodiment shown in FIG.

[2-1. Structure of back plate and mold according to this embodiment]
FIG. 4 is a top view showing the configurations of the back plate 30B and the mold 40B according to this embodiment. Note that the same components in FIG. 4 as those in FIG. 2 are denoted by the same reference numerals as those in FIG.

  Here, in the back plate 30A according to the first embodiment described above, since cooling is performed from the back surface 44 of the mold 40A, there is a distance from the region (mold 43) where the mold 40A is heated to the cooling flow path 36. In some cases, the mold 40A cannot be cooled uniformly.

  Therefore, the second surface 34 of the back plate 30B according to the present embodiment is formed with a concave shape 70 into which the mold 40B is fitted, and the cooling flow path 36 is formed along the concave shape 70. On the other hand, the mold 40B according to the present embodiment has a cubic shape as an example, and has a quadrangular (rectangular) cross section. That is, the concave shape 70 is a quadrangle (rectangle) so that the mold 40B having a quadrangle cross section can be fitted therein.

  Further, the mold 40B may be difficult to remove from the concave shape 70 due to thermal expansion or the like as a result of being fitted into the concave shape 70 of the back plate 30B. Therefore, the die 40B is formed with a screw hole 47 penetrating from the front surface 42 to the back surface 44. Then, by inserting a screw into the screw hole 47 from the front surface 42, bringing the tip of the screw into contact with the rear surface 44, and further rotating the screw, the mold 40B can be separated from the back plate 30B. As a result, the mold 40B can be removed from the back plate 30B. In the example of FIG. 4, only one screw hole 47 is formed in the mold 40B, but not limited to this, a plurality of screw holes 47 may be formed in the mold 40B.

  Further, the second surface 34 of the back plate 30B where the concave shape 70 is not formed and the front surface 42 of the mold 40B are flush with each other. That is, the second surface 34 of the back plate 30B coincides with the parting line PL at which the mold halves 40B are in contact with each other. However, the present invention is not limited to this, and a step may be provided so that the front surface 42 of the mold 40B projects from the second surface 34 of the back plate 30B if the mold 40B is sufficiently cooled. Further, in the example of FIG. 4, the side surface 38 of the back plate 30B has the step 38A, but it does not necessarily have to have the step 38A.

  As shown in FIG. 4, the concave shape 70 and the cooling flow path 36 of the back plate 30B according to this embodiment are formed so as to surround the back surface 44 and both side surfaces 45 of the mold 40B. In other words, the back plate 30B is formed such that the side surface 38 extends toward the front surface 42 of the mold 40B as compared with the back plate 30A according to the first embodiment so that the cooling flow path 36 covers the mold 40B. .. In this way, the mold 40B is cooled from the back surface 44 and both side surfaces 45, so that it is cooled more uniformly. The cooling flow path 36 shown in FIG. 4 is an example, and the present invention is not limited to this. Further, in FIG. 4, there is a gap between the concave shape 70 and the mold 40B, but this is a schematic illustration, and in reality, the concave shape 70 and the back surface 44 and both side surfaces 45 of the mold 40B. Are in contact.

  Further, since the mold 40B according to the present embodiment is formed so as to be surrounded by the concave shape 70 of the back plate 30B, its size (width and depth) is smaller than that of the mold 40A according to the first embodiment. Become. That is, since the volume of the cooled mold 40B becomes smaller, temperature control becomes easier.

  As described above, the second surface 34 of the back plate 30B according to the present embodiment is formed with the concave shape 70 into which the mold 40B is fitted, and the cooling flow path 36 is formed along the concave shape 70. .. Therefore, the back plate 30B according to the present embodiment can cool the mold 40B more uniformly.

  By preparing a plurality of back plates 30B having different sizes (height, width, depth) of the concave shape 70 in advance, it is possible to cope with the case where the sizes of the mold 40B are different.

[3. Third Embodiment]
The third embodiment of the present invention will be described below.

  The configuration of the hollow molded product manufacturing apparatus 10 according to the present embodiment is the same as the configuration of the hollow molded product manufacturing apparatus 10 according to the first embodiment shown in FIG.

[3-1. Structure of back plate and mold according to this embodiment]
FIG. 5 is a top view showing the configurations of the back plate 30C and the mold 40C according to the present embodiment. Note that the same components in FIG. 5 as those in FIG. 4 are assigned the same reference numerals as those in FIG. 4, and description thereof is omitted.

  The back surface 44 of the mold 40C according to the present embodiment has a semicircular shape. Further, in the second surface 34 of the back plate 30C according to the present embodiment, the concave shape 70 is semicircular so that the mold 40C having the semicircular back surface 44 is fitted. The back surface 44 in this embodiment corresponds to the back surface 44 and both side surfaces 45 in the second embodiment.

  The back surface 44 of the mold 40C is semicircular and the concave shape 70 of the back plate 30C is semicircular, so that the distance from the surface of the concave shape 70 to the mold 43 of the mold 40C is any position. It will be similar. As a result, the back plate 30C according to the present embodiment can cool the mold 40C more uniformly than in the second embodiment.

  Further, the mold 40B having a quadrangular cross section as in the second embodiment requires a slight gap between the mold 40B and the back plate 30B to facilitate removal from the back plate 30B. On the other hand, by making the concave shape 70 of the back plate 30C and the back surface 44 of the mold 40C semi-circular as in the present embodiment, it is possible to further narrow the gap between the mold 40C and the back plate 30C and improve the adhesion. it can. Thereby, the heat transfer efficiency between the mold 40C and the back plate 30C can be further enhanced.

  Further, as described above, the mold 40B according to the second embodiment may be difficult to remove from the concave shape 70 due to thermal expansion or the like as a result of being fitted into the concave shape 70 of the back plate 30B, as described above. The hole 47 was formed. On the other hand, since the mold 40C according to the present embodiment has a semicircular shape, by pushing from a position deviated from the central axis CL of the mold 40C (for example, arrow C in FIG. 5), as shown by arrow D. The mold 40C rotates within the concave shape 70 about the central axis CL. As a result, the mold 40C can be easily removed from the concave shape 70 of the back plate 30C, so that it is not necessary to form the screw hole 47 in the mold 40C. The central axis line CL is a line that serves as a central axis in the vertical direction when the two halves of the mold 40C are combined.

[3-2. Modification]
FIG. 6 is an enlarged view showing a modified example of the mold 40C according to this embodiment. A screw hole 47 is formed in the mold 40C shown in FIG. 6 as an example.

  In the mold 40C shown in FIG. 6(A), a part of the back surface 44 having a semicircular shape is a smooth surface 72A. In the example of FIG. 6, the smooth surface 72A is formed near the top of the semicircle. A smooth surface 72B is formed in the semicircular concave shape 70 so that the mold 40C having the smooth surface 72A is fitted to the back plate 30C. The width W of the smooth surfaces 72A and 72B shown in FIG. 6A is an example, and the width W is not limited to this.

  As a result, the mold 40C is fitted into the concave shape 70 of the back plate 30C so that the positions of the smooth surface 72A and the smooth surface 72B coincide with each other. Therefore, the mold 40C is easily attached to the back plate 30C so that the vertical and horizontal positions are predetermined positions.

  The mold 40C is placed on a surface plate or the like with the back surface 44 facing downward when performing maintenance or the like. In this case, the mold 40C without the smooth surface 72A has poor stability and is difficult to perform maintenance, and for example, a jig is required to maintain the stability of the mold 40C. On the other hand, by forming the smooth surface 72A on the back surface 44 of the die 40C, the stability is maintained by the smooth surface 72A even when the die 40C is placed on the surface plate with the back surface 44 facing down. This facilitates the maintenance of the mold 40C by the operator. That is, the smooth surface 72A formed on the die 40C is a stabilizing portion that stabilizes the die 40C when the die 40C is placed with the back surface 44 facing down. On the other hand, the smooth surface 72B formed on the back plate 30C is a fitting portion to which the stable portion formed on the die 40C is fitted.

  The smooth surface 72A that is the stabilizing portion formed on the mold 40C is an example, and a concave shape 72C may be formed on the back surface 44, as shown in FIG. 6B, for example. In the case of this form, a convex shape 72D is formed as a fitting portion in the concave shape 70 of the back plate 30C. When the back surface 44 faces down, the mold 40C is kept stable by the two straight portions 73 at both ends of the concave shape 72C. The concave shape 72C and the convex shape 72D may have a rectangular shape instead of an arc shape.

  In the mold 40C shown in FIG. 6C, a smooth surface 72A is formed on the back surface 44 and the guide groove 46 is formed. The back plate 30C is formed with a smooth surface 72B in the concave shape 70 and a protrusion 39 so as to be fitted into the guide groove 46. As a result, the mold 40C is easily attached to the back plate 30C so that the vertical and horizontal positions thereof are predetermined positions.

  In addition to this, the guide groove 46 may be formed on the die 40C without forming the smooth surface 72A, and the protrusion 39 may be formed on the back plate 30C without forming the smooth surface 72B. The protrusion 39 may be formed on the die 40C and the guide groove 46 may be formed on the back plate 30C.

[4. Other Embodiments]
Although the present invention has been described above using the above embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. Various modifications or improvements can be added to the above-described embodiments without departing from the spirit of the invention, and the embodiments to which the modifications or improvements are added are also included in the technical scope of the present invention. Moreover, you may combine suitably each said embodiment.

  For example, in each of the above-described embodiments, the mold 40 has been described as being divided for each molded product 12, but the present invention is not limited to this. The mold 40 may be divided into a plurality of molded products 12 as long as the weight can be exchanged by one person without using a plurality of people or working machines.

  Further, all the dies 43 formed on the dies 40 attached to the back plate 30 need not be the same, and dies 40 of different dies 43 may be attached to the back plate 30.

  Further, in each of the above-described embodiments, the form in which the preform 20 is sandwiched between the molds 40 to form the molded product 12 has been described, but the present invention is not limited to this, and instead of the preform, for example, a ballison. Alternatively, the molded product 12 may be formed by sandwiching the molded product 12 in the mold 40.

  Further, in each of the above-mentioned embodiments, the blow molding machine 18 is described as an injection blow molding machine, but the present invention is not limited to this, and the blow molding machine 18 is, for example, a direct blow molding machine. It may be in the form.

  Further, in each of the above-described embodiments, the form in which the molding machine to which the back plate 30 and the mold 40 are attached is the blow molding machine 18 has been described, but the present invention is not limited to this, and for example, an injection molding machine. For example, another molding machine may be used.

18 Blow Molding Machine 30 Back Plate 32 First Surface 34 Second Surface 36 Cooling Flow Path 39 Projection 40 Mold 43 Type 46 Guide Groove (Groove)
70 concave shape 72A smooth surface (stable part)
72B Smooth surface (fitting part)

Claims (13)

Is disposed between the molding machine and the mold, a back plate for a mold attachment which need use the only preparative with Ri to half the gold type formed shape machine,
A first surface attached to the molding machine;
A second surface to which the mold without a cooling flow path is attached,
A cooling channel formed between the first surface and the second surface;
Equipped with
Grooves extending in the longitudinal direction is formed on one of said mold and before Symbol second surface, extending in the longitudinal direction, the back plate for mold attachment which projections are fitted into the groove is formed on the other .. The second surface is formed with a concave shape into which the mold is fitted,
The cooling flow path toward the one side to the other side, the back plate for mold attachment according to claim 1, wherein the extending I along the concave shape.   The back plate for mounting a mold according to claim 2, wherein the concave shape is a semi-circle so that the mold having a semi-circular back surface is fitted therein. A back plate for mounting a mold, which is arranged between a molding machine and a mold and is used for mounting a half-molded mold to the molding machine,
A first surface attached to the molding machine;
A second surface to which the mold is attached, in which a cooling channel for a cooling medium is not formed,
A cooling channel formed between the first surface and the second surface;
Equipped with
The second surface, said second surface back to be attached to the that the mold which is semi-circular is fitted semicircular concave shape is formed,
The cooling flow path is a back plate for mounting a mold, which extends from one side surface to the other side surface along the concave shape . The mold has a semi-circular part of the back surface, and a stabilizing portion is formed to stabilize the back surface when placed downward.
The back plate for mounting a mold according to claim 3 or 4 , wherein a fitting portion to which the stabilizing portion is fitted is formed on the second surface. A smooth surface is formed on the top of the back surface which is a semi-circle of the mold,
The back plate for mounting a mold according to claim 5, wherein a smooth surface whose position coincides with the smooth surface of the mold is formed on the second surface. A concave shape is formed on the top of the back surface which is a semi-circle of the mold,
The back plate for mold attachment according to claim 5, wherein a fitting portion that fits into the concave shape of the mold is formed on the second surface. The cooling flow passage has an inlet and an outlet for the cooling medium formed on a side surface, and a flow passage portion extending in a lateral direction and a flow passage portion extending in a direction intersecting the vertical direction and the horizontal direction. The back plate for mounting a mold according to any one of claims 2 to 7, further comprising: 9. A projection, on which the mold and the back plate for mounting the mold are mounted, is formed extending laterally on a surface of the molding machine on the side where the mold is mounted. A back plate for mounting a mold according to any one of 1. The back plate for die attachment according to any one of claims 1 to 9 , wherein the die having only one die of a molded article is attached to the second surface. The back plate for mold attachment according to any one of claims 1 to 10 , wherein the molding machine is a blow molding machine. A mold that is divided in half and has no cooling channel,
A platen to which the mold is attached,
A back plate disposed between the mold and the platen,
On a surface of the platen on the side where the mold is attached, a protrusion that is formed to extend in the lateral direction and on which the mold and the back plate are placed,
Equipped with
The back plate is
A first surface attached to the platen,
A second surface to which the mold is attached,
A cooling channel formed between the first surface and the second surface;
Have
A molding machine in which a groove extending in the vertical direction is formed in one of the mold and the second surface, and a protrusion extending in the vertical direction and fitted into the groove is formed in the other. A mold that is divided in half and has no cooling channel,
A platen to which the mold is attached,
A back plate disposed between the mold and the platen,
On a surface of the platen on the side where the mold is attached, a protrusion that is formed to extend in the lateral direction and on which the mold and the back plate are placed,
Equipped with
The back plate is
A first surface attached to the platen,
A second surface to which the mold is attached,
A cooling channel formed between the first surface and the second surface;
Have
The mold has a semicircular back surface attached to the second surface,
The second surface is formed with a semicircular concave shape into which the mold is fitted,
The said cooling flow path is a molding machine extended along the said concave shape from one side surface toward the other side surface.

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