TWI696507B - Die casting device - Google Patents

Abstract

The present invention provides a die-casting device that can prevent bending of a runner during mold opening with a simple structure and thereby prevent deformation of a molded product. The die casting device includes: a fixed mold (20) having a plurality of first mold cavities (21); a movable mold (30) having a plurality of second mold cavities (31); and a fixed mold (20) and a movable mold (20) 30) A sliding die (40) that moves in a direction orthogonal to the opening and closing direction of the die. A cross runner groove (32) connected to the plurality of first cavities (21) and the plurality of second cavities (31) is formed on the movable mold (30). The sliding mold (40) includes A cavity (21), a plurality of second cavity (31) embedded cores (41) advancing and retreating, and at the time of mold clamping, between the fixed mold (20) and the runner groove (32) The central sliding core (42) at the position of the runner groove (32). The central sliding core (42) is located on the runner (Rc, Rs) formed in the runner groove (32) when the mold is opened.

Description

Die casting device

The present invention relates to a die-casting device, and particularly to a die-casting device for forming a slider body of a slider for a slide fastener

As a conventional die-casting device, the following device is known: a runner sleeve is divided into a nozzle contact side portion and a runner side portion, the nozzle contact side portion is fixed to a fixed mold, and the runner side portion is formed by forming The gap between the fixed molds is movably provided with respect to the fixed mold, and a coil spring is arranged between the nozzle contact side portion and the runner side portion (for example, refer to Patent Document 1). In this die-casting device, when the mold is opened, the nozzle contact side portion and the runner side portion can be reliably separated by the urging force of the coil spring, and a large demolding resistance can not be generated temporarily, and the sprue can be removed from The mold is surely demolded.

Existing technical literature

Patent Literature

Patent Document 1: Japanese Patent No. 2815919

However, in the die-casting device described in Patent Document 1, the structure is complicated, so the manufacturing cost is high and the maintainability is low. In addition, since the space for the nozzle contact side portion, the runner side portion, and the coil spring needs to be provided, the thickness of the fixed mold becomes large, and the apparatus becomes large.

In addition, when the sprue bushing is not divided into the nozzle contact side portion and the cross runner side portion, when the mold is opened, there may be a momentary separation between the fixed mold and the sprue For die resistance, the sprue is pulled toward the fixed mold side, and the cross-runner bends, causing deformation of the molded product.

The present invention was made in view of the foregoing circumstances, and an object of the present invention is to provide a die-casting device that can prevent bending of a runner during mold opening with a simple structure and prevent deformation of a molded product.

The above object of the present invention is achieved by the following structure.

(1) A die-casting device, including: a fixed mold having a plurality of first cavities; a movable mold having a plurality of second cavities; and a mold disposed between the fixed mold and the movable mold and being positive in the opening and closing direction with the mold The sliding die moving in the direction of the intersection, the die casting device is characterized in that a cross runner groove connected with a plurality of first cavities and a plurality of second cavities is formed on the moving die, the sliding die includes: embedding Core, which advances and retreats with respect to the plurality of first cavities and the plurality of second cavities; and the central sliding core, which is located between the fixed mold and the runner groove during mold clamping and is located Position, the central sliding core is located on the runner in the runner groove when the mold is opened.

(2) The die casting device according to (1), characterized in that a guide groove for guiding the movement of the central sliding core is formed on the movable mold, and the central sliding core is formed with Protruding strips fitted with guide grooves.

(3) The die-casting device according to (1) or (2), characterized in that a sprue hole into which the melt injected from the injection molding machine is injected is formed in the fixed mold, and the molded product molded by the die-casting device is formed There is a sprue formed by sprue holes, and the central sliding core is arranged around the sprue.

According to the present invention, a runner runner connected to a plurality of cavities is formed on the movable mold, the sliding die includes an embedded core that advances and retreats relative to the plurality of cavities, and a fixed mold and a runner runner during mold clamping The central sliding core is located between and covering the runner groove. The central sliding core is located on the runner in the runner channel during mold opening. Therefore, when the mold is opened, the runner will be slipped by the center The core is stuck, and the runner can be pulled near the moving mold. Therefore, it is possible to prevent bending of the runner at the time of mold opening with a simple structure, thereby preventing deformation of the molded product.

10: Die-casting device

20: fixed mode

21: cavity (first cavity)

22: Straight runner hole

30: moving mold

31: cavity (second cavity)

32: Cross-runner channel

33: Rectifier

34: Guide groove

35: Sell out

40: Sliding mode

41: Embedded core

41a: cavity

41s: side

42: Central sliding core

42a: recess

42b: protrusion

50: Die-casting device

51: fixed core

51s: left and right sides

D: molding

R: sprue

R1: Stepped part

Rc: central runner

Rs: side runner

SP: sprue

SD: molded product

P: pushed part

ST: Stepped part

FIG. 1 is a longitudinal cross-sectional view illustrating an embodiment of the die casting apparatus of the present invention.

Fig. 2 is a plan view of the cavity side of the fixed mold shown in Fig. 1.

Fig. 3 is a plan view of the cavity side of the movable mold shown in Fig. 1.

4 is a cross-sectional view taken along line A-A of FIG. 1 in a state where the mold is fully opened.

Fig. 5 is a sectional view taken along line B-B of Fig. 3.

Fig. 6 is a cross-sectional view corresponding to Fig. 4 for explaining a mold clamping state.

7 is a cross-sectional perspective view of the periphery of the sprue in the mold clamping state.

FIG. 8 is a cross-sectional view corresponding to FIG. 4 illustrating a state where the runner is caught by the central sliding core when the mold is opened.

9 is a cross-sectional perspective view of the periphery of the sprue during mold opening.

FIG. 10 is a perspective view illustrating a molded article molded according to an embodiment of the die casting apparatus of the present invention.

Fig. 11 is a partially enlarged perspective view of the movable mold of the old type die casting device.

FIG. 12 is a diagram of the periphery of the sprue of the molded product that explains the flow of molten metal in the die casting apparatus of FIG. 11.

13 is a perspective view for explaining the melting loss of the embedded core in the die casting apparatus of FIG. 11.

14 is a plan view of the cavity side of a modification of the fixed mold.

Hereinafter, an embodiment of the die casting apparatus of the present invention will be described in detail based on the drawings. In the following description, the upper side is the upper side relative to the paper surface of FIG. 1, the lower side is the lower side relative to the paper surface of FIG. 1, the left side is the left side relative to the paper surface of FIG. 1, and the right side is the relative surface On the right side of the paper surface of FIG. 1, the front side is set to the front side relative to the paper surface of FIG. 1, and the rear side is set to the back side relative to the paper surface of FIG. 1.

As shown in FIGS. 1 to 4, the die casting device 10 of this embodiment includes: a fixed mold 20 having a plurality of cavities 21 (first cavity) on a lower surface; and a movable mold 30 arranged at Under the fixed mold 20, and having a plurality of cavities 31 (second cavity) on the upper surface; and a pair of front and rear sliding molds 40, which are arranged between the fixed mold 20 and the movable mold 30, and open and close with the mold The direction (vertical direction) is orthogonal to the direction (front-rear direction). In addition, the plurality of cavities 21 and 31 of the present embodiment are each about eight, for a total of sixteen. In addition, the movable mold 30 is configured to be driven in the vertical direction.

In addition, as shown in FIGS. 1 and 2, a sprue hole 22 is formed in the center of the left-right direction and the front-rear direction of the fixed mold 20 to allow molten metal injected from an injection molding machine (not shown) to be injected.

As shown in FIGS. 1 and 3, a runner groove 32 connected to a plurality of cavities 31 of the movable mold 30 is formed along the left-right direction at the center of the upper surface of the movable mold 30 in the front-rear direction. In addition, the sprue hole 22 of the fixed mold 20 is arranged so as to be located in the center of the lateral sprue groove 32 in the left-right direction. In addition, at the center in the left-right direction of the sprue groove 32, there is provided a rectifying portion 33 that rectifies the flow of molten metal injected into the sprue hole 22 and has a substantially conical shape at the tip.

As shown in FIG. 3, the sliding die 40 includes a pair of left and right insert cores 41 that advance and retreat with respect to the plurality of cavities 21, 31, and a central sliding core disposed between the left and right insert cores 41 (center slide core)42. In addition, the left and right embedded cores 41 and the central slide core 42 are configured to be driven in the front-rear direction in accordance with the vertical movement of the movable mold 30.

In addition, a cavity 41 a is formed at the tip of the left and right embedded cores 41. In addition, at the tip of the central sliding core 42, a substantially U-shaped recess 42 a is formed that avoids the tip of the rectifying portion 33.

In addition, as shown in FIGS. 3 and 5, a pair of front and rear guide grooves 34 that respectively guide the movement of the front and rear center sliding core 42 are formed on the upper surface of the center portion of the movable mold 30 in the left-right direction. In addition, on the lower surface of the center slide core 42, a protrusion 42 b fitted into the guide groove 34 is formed.

Here, the molded object D molded by the die casting apparatus 10 of the present embodiment will be described. As shown in FIG. 10, the molded product D has a sprue SP formed by the sprue hole 22 of the fixed mold 20, and a central sprue Rc formed by the sprue groove 32 of the movable mold 30, and It extends in the front-rear direction under the sprue SP; the side sprue Rs is formed by the sprue groove 32 of the movable mold 30 and extends from the front-rear center of the center sprue Rc to the left-right direction; The molded product SD is connected to the left and right side runners Rs; and the pressed portions P are formed at the top ends of the left and right side runners Rs, respectively, and are ejected by an ejector pin 35 described later Push.

In addition, a stepped portion ST formed by the concave portion 42a of the center slide core 42 is formed at the upper end of the central runner Rc. As shown in FIGS. 8 and 9, the upper surface of the stepped portion ST becomes The part caught by the lower edge of the recess 42a of the center slide core 42. In addition, the formation of the stepped portion ST on the central runner Rc below the sprue SP by the recess 42 a of the central slide core 42 means that the central slide core 42 is arranged around the sprue SP.

Moreover, in the present embodiment, the front and rear center sliding cores 42 are located between the fixed mold 20 and the runner groove 32 and are positioned to cover the runner groove 32 at the time of mold clamping (see FIGS. 6 and 7) . In addition, the front and rear central sliding cores 42 are located on the upper surface of the stepped portion ST of the central runner Rc formed in the runner groove 32 at the time of mold opening and The upper surface of the base part of the left and right side runners Rs (refer FIG. 8, FIG. 9). Therefore, when the mold is opened, since the upper surface of the stepped portion ST of the central runner Rc and the upper surfaces of the bases of the left and right side runners Rs are caught by the front and rear central sliding cores 42, the central runner Rc And the left and right side runners Rs are pulled near the movable mold 30.

In addition, as shown in FIGS. 1 and 3, four ejector pins 35 are provided on the movable mold 30 to demold the molded product D after molding. The four ejector pins 35 are configured to move up and down in order to push the molded product D upwards. The two ejector pins 35 are arranged at positions that press the front and rear ends of the central runner Rc, respectively. The two ejector pins 35 are respectively arranged at positions where the pressed portion P of the left and right side runners Rs is pressed.

As described above, according to the die-casting device 10 of the present embodiment, the front and rear central sliding cores 42 are located between the fixed mold 20 and the runner groove 32 and over the runner groove 32 during mold clamping, In addition, the upper surface of the stepped portion ST of the central runner Rc formed in the runner groove 32 and the upper surface of the base of the left and right runners Rs are formed at the time of mold opening. The runners Rc and Rs are caught by the central sliding core 42 at the front and rear, and the runners Rc and Rs can be pulled to the vicinity of the movable mold. Therefore, it is possible to prevent bending of the runners Rc and Rs at the time of mold opening with a simple structure, thereby preventing deformation of the molded product SD.

Next, a die-casting device 50 that is an old device of the die-casting device 10 of the present embodiment will be described. In this die-casting device 50, as shown in FIG. 11, there is no center slide core 42 in the front and rear, but a fixed core 51 is formed on the upper surface of the movable mold 30. In this case, as shown in FIG. 12, the molten metal injected into the sprue hole collides with the step portion R1 of the sprue R and becomes a turbulent flow (see FIG. 12 arrow), so the quality of the molded product SD will decline. In addition, since the high-temperature molten metal that has just been injected collides with the side surfaces 41s (see FIG. 13) of the left and right embedded cores 41 forming the step portion R1 of the runner R, the side surfaces 41s are susceptible to melting loss.

However, in the die casting apparatus 10 of the present embodiment, since the front and rear center sliding cores 42 are provided to remove the stepped portion R1, turbulent flow of molten metal can be prevented, and the quality of the molded product SD can be improved. In addition, since the stepped portion R1 is removed, the high-temperature molten metal does not collide with the side surfaces 41s of the left and right insert cores 41, so that the melt loss of the insert core 41 can be prevented. Further, for example, even if the central sliding core 42 has melted, it is only necessary to replace the central sliding core 42 whose manufacturing cost is significantly lower than that of the embedded core 41, so the maintenance cost of the die casting device 10 can be greatly reduced.

In addition, in the old type die-casting device 50, as shown in FIG. 11, the left and right side faces 51s of the fixed core 51 of the movable mold 30 are in sliding contact with the side faces 41s of the left and right embedded cores 41, so the left and right side faces of the fixed core 51 51s and the side surface 41s of the left and right embedded core 41 wear out. However, in the die casting apparatus 10 of the present embodiment, since the fixed core 51 is removed and the center slide core 42 is arranged, the side surfaces of the left and right embedded cores 41 are not worn. In addition, since the left and right insert cores 41 move together with the center slide core 42, the side surfaces of each other do not wear out. Therefore, it is possible to prevent the wear of the left and right embedded cores 41 and the central sliding core 42 and achieve a longer life.

Further, as a modification of this embodiment, as shown in FIG. 14, the runner groove 32 may be formed on the fixed mold 20. In this case, not on the movable mold 30 形成横洗槽槽32。 Forming the cross-runner channel 32. In addition, the runner groove 32 may be formed on both the fixed mold 20 and the movable mold 30.

In addition, the present invention is not limited to the contents exemplified in the above-mentioned embodiments, and can be appropriately changed within the scope not departing from the gist of the present invention.

For example, in the present embodiment, a pair of sliding dies is provided, but it is not limited to this. Depending on the shape of the molded product, there may be one sliding die.

In addition, in this embodiment, a molded product made of metal is molded, but it is not limited thereto, and a molded product made of synthetic resin may be molded.

10‧‧‧Die casting device

20‧‧‧Fixed

22‧‧‧Straight runner hole

30‧‧‧Moving mode

32‧‧‧Side runner trough

33‧‧‧Rectifying Department

35‧‧‧ Top selling

40‧‧‧sliding die

41‧‧‧Embedded core

42‧‧‧Central sliding core

Claims (3)

A die-casting device includes: a fixed mold having a plurality of first mold cavities; a movable mold having a plurality of second mold cavities; and a mold disposed between the fixed mold and the movable mold, and being positive in the direction of opening and closing with the mold The sliding mold moving in the direction of the intersection, the die casting device is characterized in that a cross runner groove connected to the plurality of first cavities and the plurality of second cavities is formed on the movable mold , The sliding die includes: an embedded core that advances and retreats with respect to the plurality of first cavities and the plurality of second cavities; and a central sliding core that is in the fixed mold and Between the runner channels and at a position covering the runner channels, the central sliding core is located on the runners formed in the runner channels during mold opening. The die casting device according to item 1 of the patent application scope, wherein a guide groove for guiding the movement of the central sliding core is formed on the movable mold, and a guide groove is formed on the central sliding core Groove-fitting protrusions. The die-casting device as described in item 1 or 2 of the patent application, wherein a sprue hole for injecting the melt injected from the injection molding machine is formed on the fixed mold, The molded article formed by the die casting device has a sprue formed by the sprue hole, and the central sliding core is disposed around the sprue.

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