JP2003305556A - Direct pressure molten metal squeeze casting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a direct pressure molten metal squeeze casting apparatus which directly secondarily pressurizes a molten metal filled in a mold by moving an upper die section vertically downwards from above and finally pressurize the metal by a lower die section. <P>SOLUTION: The direct pressure molten metal squeeze casting apparatus comprises: the upper die section and the lower die section. The upper die section includes an upper spacer 44 coupled to an upper plate 16, an upper die 47, and an annular injection ring 50 of a product mold releasing means provided at a center clamped at the lower part of an upper knock-out cylinder 10. The lower die section includes a lower die 48 coupled to the upper part of a lower knock-out cylinder 9, and a side die 46 rotatably clamped at an assembling member 33 coupled to the die 48. The die 46 is linked to a side holder 3 coupled to a lower plate 1 via link members 40, 43. The lower die section is separated from the plate 1, and raised. When the lower die section is raised, the die 46 is automatically extended, while when the lower die section is lowered, the die 46 is automatically shrunk. The holder 32 coupled to the plate 1 is brought into close contact with the die 46, supported, and when the molten metal is squeeze-cast, the holder 32 resists against the pressure affecting to the die 46. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct pressure type non-ferrous metal forging device for vertically moving a molten metal by vertically moving an upper mold. The present invention relates to a direct press type molten metal forging device of a system in which primary preforming and secondary high pressure forming are performed, and third pressurization is directly performed by operating a lower cylinder.

[0002]

2. Description of the Related Art Generally, existing non-ferrous metal casting methods include a gravity casting method, a low pressure casting method, a vacuum casting method, etc., and recently, forging methods have been actively researched and developed. There is. Such activation of research and development essentially leads not only to the creation of high added value for a company by quality improvement, but also to weight reduction in terms of environment and economy.

Among existing casting methods, gravity casting and low-pressure casting have a slow solidification rate and a decrease in density due to shrinkage and gas defects. The mechanical properties of each part are low, and the difference in mechanical properties is large. Since die casting has a high injection rate, oxides and gases are mixed. For this reason, die casting is used for manufacturing cases such as those having low required mechanical properties. High pressure casting (squeeze casting)
Due to the low mold temperature and the high injection rate, the shape and thickness of the product are limited. Most of the existing molten metal forging methods are indirect pressurization methods, the production cost of molds and machines is high, price competitiveness is low, and it is difficult to develop and mass-produce.

As described above, although the conventional gravity casting and low pressure casting are basically not restricted by the shape, size and thickness of the product, the mold temperature and the molten metal temperature are relatively high and the solidification time is long. However, the shrinkage of the product and defects in the product such as pinholes deteriorate the density and mechanical properties, and thus the weight of the product cannot be reduced due to the weight reduction. In particular, in the case of relatively large and complicated automobile parts such as aluminum wheels for automobiles, it is the fact that they do not respond to the trend of weight reduction of automobiles and do not lose their backward motion. . Therefore, in order to solve the above-mentioned problems, the limit is clear depending on the existing construction method, and the development of a new construction method is urgently required.

[0005]

Therefore, the present invention has been made to solve the above problems.
It is an object of the present invention to provide a direct pressure type molten metal forging device in which an upper die moves vertically downward from an upper portion and directly presses the molten metal injected into the die over a secondary period. Another object of the present invention is to provide a knockout cylinder in the lower mold part, and by moving the cylinder vertically upward to finally pressurize the molten metal, deformation or density difference due to local volume change generated in the solidification process. It is an object of the present invention to provide a direct pressure type molten metal forging device capable of eliminating the above.

Still another object of the present invention is to construct the lower mold part with a lower mold, a side mold and a side holder,
The object of the present invention is to provide a direct pressure molten metal forging device having a simple structure and excellent adhesion between parts by integrally linking these.

Still another object of the present invention is to fix a side holder connected to a side mold by a rotatable connecting member to a lower plate so that a side cylinder for counteracting a molten metal forging pressure can be obtained. It is an object of the present invention to provide a direct pressure type molten metal forging device that does not require the conventional essential accessory device.

Still another object of the present invention is that the lower mold part is lifted by the lower knockout cylinder for releasing from the mold after molding, and when the lower mold is lifted, the side holder and the side fixed to the lower plate. It is an object of the present invention to provide a direct pressure type molten metal forging device in which a side mold is automatically expanded by rotating a link member of the mold and the side mold is contracted when a lower mold is lowered.

Still another object of the present invention is to include a riser tube for injecting a molten metal in which a ceramic filter is provided in order to prevent generation of an oxide due to a erosion phenomenon at the time of injecting the molten metal and mixture into the molten metal. A direct pressure type molten metal forging device is provided.

A further object of the present invention is to provide a direct pressure type molten metal forging device in which the demolding means at the center of the upper die is constituted by an annular eject ring.

Still another object of the present invention is to provide a direct pressure type molten metal forging device which has a fine structure and a fine structure, is excellent in mechanical properties, can be reduced in weight, and is excellent in productivity. .

[0012]

To achieve the above object, according to the present invention, the upper die moves downward to directly perform primary preforming and secondary high pressure forming, and the third cylinder is directly applied by the operation of the lower cylinder. A direct pressure type molten metal forging device of a pressing type is provided. The molten metal forging device includes an upper die part and a lower die part. The lower mold part includes a lower mold, a side mold and a side holder, and the lower mold, the side mold and the side holder are integrally linked. The side holder acts as a support for the side mold.

The direct pressure type molten metal forging device of the present invention is a molten metal injecting device having upper and lower filters provided therein in order to prevent oxides generated due to a phenomenon of burn-out from being mixed into the product at the time of injecting the molten metal. In addition to the riser tube, it also contains a molten metal heat insulation furnace, a control unit and accessory components.

The present invention is remarkably excellent in production cycle time, tensile strength, density, elongation rate, etc., as compared with other existing cast products. The molten metal forging of the present invention is a method of directly pressing the molten metal from above and below, the equipment is simpler than the conventional indirect pressure method, and the manufacturing cost of the machine body and the die cost can be significantly reduced. Therefore, it is possible to enhance the competitiveness of product cost and quality.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The direct pressure molten metal forging device of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a schematic configuration diagram of a direct pressure type molten metal forging device of the present invention, FIG. 2 is an exemplary diagram showing a molten metal injection according to the present invention, FIG. 3 is an exemplary diagram showing a casting and molten metal forging according to the present invention, and FIG. FIG. 5 is an exemplary view showing an expanded state of a mold according to the invention, FIG. 5 is an exemplary view showing a state where a product according to the present invention is detached from a lower mold, and FIG. 6 is an exemplary view showing a state where a product is taken out by a product receiver according to the present invention. 7 is an exemplary view showing a structure of a heat insulating furnace according to the present invention, and FIG. 8 is an exemplary view showing a combined state of upper and lower mold portions and an expanded state of side molds of a lower mold portion according to the present invention.

The direct pressure type molten metal forging device of the present invention transfers a fixed amount of molten metal to a mold part, a main body composed of a main body frame, an upper body and a lower body connected to the frame. It includes a transfer means including a ladle and an operation control section for the forging process. In the upper body of the main body, a hydraulic main cylinder 8 is provided at the center of the crown portion 2 at the upper center, and auxiliary cylinders 11 are provided on the left and right sides of the main cylinder. The slide table 3 is mounted below the main cylinder 8 and the auxiliary cylinder 11. An upper knockout cylinder 10 is connected to the main cylinder 8 at the center of the slide table 3. An upper plate 16 is coupled to the lower portion of the slide table 3. An upper die part A including a demolding means is fastened to the upper plate 16. The upper mold part A is lowered by the main cylinder 8 and raised by the auxiliary cylinder 11.

The upper mold part A is the upper plate 1
6, a connecting member 31 fixed to the connecting member 31, an upper spacer 44 fixed to the connecting member 31, an upper mold 47 fixed to the upper spacer 44, and a product releasing means.

The product releasing means is an eject plate 52 mounted on the upper knockout cylinder 10.
53, an eject pin 54 provided on the eject plates 52, 53, and an annular eject ring 50 that is a product releasing means of a center portion that is fastened to a lower portion of the upper knockout cylinder 10.
A vent pin (not shown) is provided adjacent to the eject pin 54 for exhausting the product during molding.

In the lower body of the main body, a lower knockout cylinder 9 is attached to the center of the lower support 5, and the lower plate 1 is fixed to the outer peripheral edge of the lower knockout cylinder 9. The lower plate 1
The fixing member 30 includes a conventional fixing means 56 such as a bolt.
Are combined by. A side holder 32 including an electric heating device 55 for heat retention is fixed to the fixing member 30. On the upper part of the lower knockout cylinder 9, there is a lower mold part B.
Is concluded.

The lower mold part B includes a first assembly member 34 fixed to the upper part of the lower knockout cylinder 9.
A lower mold 48 fixed to the first assembly member 34, a second assembly member 33 fixed to the lower mold 48, and a side mold one side of which is rotatably connected to the second assembly member 33. 46 and.

The other side of the side mold 46 is fastened to a rotatable first link member 43, and the first link member 43 is attached.
Is linked to the second link member 40, and the second link member 40 is linked to the side holder 32 fixed to the lower plate 1.

The lower mold part B of the present invention constructed as described above is fixed to the upper part of the lower knockout cylinder 9, but is not fixed to the lower plate 1, so that it is separated from the lower plate 1. It can rise or fall, and the side mold 46 is automatically expanded when the lower mold part B is raised, and the side mold 46 is automatically contracted when the lower mold part B is lowered. The side holder 32 fixed to the lower plate 1 closely adheres to and supports the side mold 46 and acts against the pressure exerted on the side mold 46 during the forging of molten metal. No accessories are required.

A transfer means for the molten metal injecting riser tube 19 is provided on one side of the central part of the main body, and a transfer means for the molten metal quantitative transfer ladle 22 is provided on the other side so as to be vertically movable and rotatable by a control system. Further, means for transporting the product receiver 23 is further provided.

Inside the molten metal injection riser tube 19 according to the present invention, when pouring the molten metal, the generation of oxides due to the phenomenon of burn-through is prevented, and the oxides that can be contained in the molten metal are filtered to remove the oxides. To prevent mixing in the mold,
Disposable ceramic filtration membranes 18 are provided, and preferably disposable ceramic filtration membranes 18 are provided in the upper and lower two places.

A heat insulating pad 57 is interposed between the upper plate 16 and the connecting member 31 fixed thereto and between the lower plate 1 and the fixing member 30 fixed thereto. By connecting air cooling pipes to the upper and lower mold parts, a cooling water spraying system is further provided to help the mold to be rapidly cooled after molding, especially for cooling the knockout punch 35 of the lower mold part. .

An ordinary molten metal heat insulation furnace 51 is provided immediately below the molten metal quantitative transfer ladle 22. The molten metal heat insulation furnace 5
1 is provided with a gas treatment device 28 for removing gas mixture and precipitated oxides due to long-time exposure of the molten metal, and a molten metal heat-retaining furnace 51 is prevented from causing eddy currents and floating of precipitates generated when the molten metal is replenished. To provide a buffer space for
A primary that forms a molten metal flow path that goes up and down in a zigzag manner,
Secondary and tertiary partitions 25, 26, 27 are provided.

The operation of the direct pressure molten metal forging device according to the present invention will be described in detail below with reference to the accompanying drawings showing an automobile aluminum alloy wheel molding die as an example. First, the upper mold part A is fastened to the upper plate 16 of the main body, and the lower mold 48 and the side mold 46 are attached to the assembly members 33 and 34 fixed to the upper part of the lower knockout cylinder 9.
Is fastened, the side holder 32 is fixed to the fixing member 30 fixed to the lower plate 1 fixed to the lower support portion 5 by the bolt 56, and the side mold 46 and the side holder 32 are connected by the link members 40 and 43. . After that, when the main cylinder 8, the auxiliary cylinder 11, and the upper and lower knockout cylinders 10 and 9 are operated, the upper mold part A is in an expanded state,
The lower mold part B is in a contracted state, and is in a starting preparation state for the mold.

In this state, the molten metal transfer ladle 22 (see FIG. 2) located immediately above the heat-retaining furnace 51 shown in FIG. 7 descends until it detects the molten metal, and is set in advance in a controller (not shown). It will rise after filling a certain amount of molten metal. At this time, the molten metal injecting riser tube 19 heated by a heating device (not shown) is located at the injecting position on the lower die part B including the knockout punch 35,
As shown in FIG. 2, the molten metal transfer ladle 22 rotates to inject the molten metal into the lower mold 48 through the molten metal injecting riser tube 19. When the injection of the molten metal into the lower die 48 is completed, the molten metal transfer ladle 22 and the molten metal injecting riser tube 19 return to their original positions.
Since the upper mold part A fastened to the upper plate 16 is controlled by the control system of the control part in which position control, speed control and pressure control are combined, the upper mold part A including the eject ring 50 is lowered. Then (0.4-40
mm / sec), the molten metal filled in the lower mold 48 is directly pressurized to perform primary preforming, and high pressure (35 kg / mm ² )
Secondly pressurizing maximizes the effect of molten metal forging.

Then, as shown in FIG. 3, in order to prevent a local volume change due to solidification, the lower knockout cylinder 9 pressurizes the molten metal to the third order. In this state, pressure from above and below is maintained until the molding and solidification are completed, and the mold is cooled by the air supplied through the pipes connected to the upper and lower mold parts. After that, the main pressure is released by the setting value of the setting timer of the control unit,
By the knockout cylinder 9 of the lower mold part B and the auxiliary cylinder 11 of the upper mold part, the upper mold part A and the lower mold part B are
Are raised at the same time. As the lower mold part rises,
The side molds 46, which are linked to each other by a link, are attracted by the link members 40 and 43 that are rotatably coupled to the side holder 32 fixed to the lower plate 1,
It is expanded as shown in FIG.

After that, as shown in FIG.
As product rises, the product is separated from the lower mold 48 and the product receiver 23 moves to the lower part of the upper mold part. Then, the eject ring 50 and the eject pin 54 are actuated at the same time as the actuation of the upper knockout cylinder 10 and the eject plates 52 and 53 coupled to the slide table 3 to separate the product attached to the upper mold 47. The upper die 47 rises and stops at the top dead center, the upper knockout cylinder 10 retreats, the main body comes to a stop, and the product receiver 23 retreats to complete the one cycle molding process.

In the forming process by the direct pressure type molten metal forging device of the present invention as described above, the upper mold is lowered and the lower mold is directly pressurized to directly preform the molten metal and 2 Next, high-pressure forging is performed, and the lower die is used to apply high pressure to the tertiary pressure. The aluminum alloy wheel for automobiles described above is only one example, and by applying various combinations of upper and lower molds, it is possible to achieve high productivity and high productivity for non-ferrous metal molten metal forging products of any shape, size and thickness. It can be molded with quality.

Table 1 below shows a comparison between the direct pressure molten metal forging according to the present invention and an existing aluminum alloy (A356.2) wheel produced by low pressure casting.

[0033]

[Table 1]

[0034]

As described above, according to the direct pressure type molten metal forging apparatus of the present invention, the upper die directly presses the entire surface of the molten metal injected into the lower die for preforming and high pressure forging, Then, high pressure is applied by the lower mold.
Therefore, compared with the conventional indirect pressurization method that mainly depends on the mold temperature, not only the forging effect is significantly superior,
A knockout cylinder corresponding to a local volume change due to solidification is attached to the lower part and operates at a high pressure to further enhance the forging effect. Further, since the lower mold part, the side mold, and the side holder are integrally connected to each other by the link, the lower mold part is simple and excellent in close contact with each other by pressing.

In particular, since the side holder is fixed to the lower plate with bolts and reacts against the forging pressure from above and below, not only the conventional side cylinder is not required in the main body of the apparatus, but also an auxiliary device by it is not required. is there. Therefore, the production cost of the device and mold is low, the performance is excellent,
The cycle time required for production is shortened (the productivity is three times that of the conventional low pressure casting method), the elongation rate is improved, and high strength products can be produced. Further, since there is no restriction on the complexity, thickness and size of the product shape, it is possible to provide high added value.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a direct pressure molten metal forging device of the present invention.

FIG. 2 is an exemplary view showing molten metal injection according to the present invention.

FIG. 3 is an exemplary view showing a casting and molten metal forging according to the present invention.

FIG. 4 is an exemplary view showing an expanded state of a mold according to the present invention.

FIG. 5 is an exemplary view showing a state in which a product according to the present invention is separated from a lower mold.

FIG. 6 is an exemplary view showing a product removal state by a product receiver according to the present invention.

FIG. 7 is an exemplary view showing a configuration of a heat insulation furnace according to the present invention.

FIG. 8 is an exemplary view showing a combined state of upper and lower mold parts and an expanded state of a side mold of a lower mold part according to the present invention.

[Explanation of symbols]

A Upper mold part B Lower mold part 1 Lower plate 2 Crown part 3 slide table 5 Lower support 8 main cylinders 9 Lower knockout cylinder 10 Upper knockout cylinder 11 Auxiliary cylinder 16 Upper plate 18 filtration membrane 19 riser tube 22 Ladle for pouring molten metal 23 Product receiving 25, 26, 27 partition 28 gas treatment equipment 30 Side holder fixing member 31 Upper mold part connecting member 32 side holder 33 Lower mold part connecting member 34 Lower mold assembly member 35 Knockout punch 40, 43 Link member 44 Upper spacer 46 Side mold 47 Upper mold 48 Lower mold 50 eject ring 51 Insulating furnace 52, 53 eject plate 54 eject pin 55 Heating device for heat retention 56 fixing means 57 Insulation pad

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tace, Ha             Republic of Korea, Taejong-si 305-330,             Yousung-ku, Kijok-don 877,             Yorume Apartment 504-504 (72) Inventor John-Hun, Baek             Republic of Korea, Kyongjid 463-821,             Seongnam-si, Bundang-ku, Sohyo             Ndon 87, Samsung Sibon Apa             133-1406

Claims (7)

[Claims] 1. A molten metal forging device comprising a main body having an upper body and a lower body joined to a frame, a molten metal heat-retaining furnace, a molten metal transfer means for transferring the molten metal to a die part, and a control part. The upper body of the main body has a main cylinder (8) provided at the center of the upper portion, auxiliary cylinders (11) provided on the left and right sides of the main cylinder (8), the main cylinder (8) and the auxiliary cylinder. A slide table (3) attached to the bottom of the cylinder (11), an upper knockout cylinder (10) coupled to the main cylinder (8) at the center of the slide table (3), and the slide table (3) Upper plate (16) to be joined to the lower part of
And an upper mold part (A) that is fastened to the upper plate (16), has demolding means, descends by the main cylinder (8), and ascends by the auxiliary cylinder (11), The lower body part of the main body is connected to the lower knockout cylinder (9) attached to the center of the lower support part (5) and the lower support part (5) at the outer peripheral edge part of the lower plate (1).
And a side holder (32) coupled to the lower plate (1) and having a heating device (55) for heat retention, and fastened to an upper part of the lower knockout cylinder (9), and the molten metal is melted by the lower knockout cylinder (9). And a lower mold part (B) for pressurizing and raising the molten metal. 2. The upper mold part (A) includes a connecting member (31) connected to the upper plate (16), and an upper spacer (44) connected to the connecting member (31).
The upper die (4) coupled to the upper spacer (44)
7) and a demolding means, and the demolding means is provided with an eject plate (52, 53) mounted on the upper knockout cylinder (10) and an eject pin provided on the eject plate (52, 53). (54)
The direct pressure molten metal forging device according to claim 1, further comprising: an eject ring (50) fastened to a lower portion of the upper knockout cylinder (10). 3. A first assembly member (34) in which the lower mold part (B) is coupled to an upper portion of the lower knockout cylinder (9), and a lower portion which is coupled to the first assembly member (34). A mold (48), a second assembly member (33) coupled to the lower mold (48), and the second assembly member (33)
A side mold (46) having one side rotatably fastened thereto, and the other side of the side mold (46) fastened to a rotatable first link member (43). 43) is linked to a second link member (40), the second link member (40) is rotatably coupled to a side holder (32) coupled to the lower plate (1),
The lower mold part (B) separates from the lower plate (1) and moves up and down, and when the lower mold part (B) rises, the side mold (46).
The direct pressure molten metal forging device according to claim 1, wherein the side mold (46) is expanded when the lower mold part (B) is lowered. 4. The side holder (32) so as to resist the pressure exerted on the side mold (46) during the forging of molten metal,
The direct pressure molten metal forging device according to claim 1, wherein the device is closely attached to a side die (46) and is joined to the lower plate (1). 5. A riser tube (19) for injecting a molten metal, which is mounted on the lower mold (48) and then returned by a transfer means provided on one side of a central portion of a main body so as to be vertically movable and rotatable. The direct pressure molten metal forging device according to claim 1, further comprising: 6. The riser tube (19) for injecting the molten metal
The direct pressure type molten metal forging device according to claim 5, wherein a ceramic filter membrane (18) for filtering oxides contained in the molten metal is provided inside. 7. The upper mold (47) and the lower mold (4)
8. The direct pressure molten metal forging device according to claim 1, wherein 8) is for manufacturing an aluminum alloy wheel for automobiles.