JP6861129B2 - Injection device for die casting and die casting method - Google Patents

Description

The present invention relates to a die-cast molding injection device and a die-cast molding method, and more particularly to a die-cast molding injection device and a die-cast molding method for injecting a semi-solid metal to mold a molded product.

Conventionally, a molding apparatus for injecting a semi-molten metal (semi-solidified metal) to mold a molded product is known (see, for example, Patent Document 1).

Patent Document 1 discloses a molding apparatus including an injection sleeve on which a semi-molten metal is installed, a plunger, and a carrier in which the semi-molten metal is stored and held by an articulated robot and conveyed to the injection sleeve. ing. The carrier is a container in which the semi-molten metal is housed. Further, the conveyor has a cylinder (pressing mechanism) for extruding the semi-molten metal from the inside of the transporter. The carrier containing the semi-molten metal is moved to a predetermined position of the injection sleeve by an articulated robot and placed. Then, the cylinder installs the semi-molten metal in the injection sleeve by pushing out the semi-molten metal in the conveyor held by the articulated robot. Then, the plunger injects the semi-molten metal installed in the injection sleeve into the mold.

Japanese Unexamined Patent Publication No. 10-305363

Here, in general, when the semi-molten metal (semi-solidified metal) is installed in the injection sleeve, it is preferable that the amount of air entrained in the semi-molten metal installed in the injection sleeve is small, so that the semi-molten metal is installed. It is preferable that this is done without breaking the shape of. However, in the molding apparatus disclosed in Patent Document 1, a transporter having a cylinder (extrusion mechanism) is moved together with the semi-molten metal by an articulated robot and placed at a predetermined position on the injection sleeve for each injection molding. Therefore, there is an inconvenience that the position of the cylinder with respect to the injection sleeve varies from injection molding to injection molding. Therefore, there is a problem that the shape of the semi-molten metal installed in the injection sleeve by the cylinder is not stable. Therefore, the shape of the semi-molten metal may collapse depending on the position of the cylinder with respect to the injection sleeve.

The present invention has been made to solve the above-mentioned problems, and one object of the present invention is a die casting capable of stabilizing the shape of a semi-solidified metal installed in an injection sleeve by an extrusion mechanism. The present invention provides an injection device for molding and a die casting method.

In order to achieve the above object, the injection device for die casting according to the first invention includes an injection sleeve capable of arranging a tubular container containing a semi-solid metal while being held by the transfer device, and an injection sleeve inside the injection sleeve. The plunger for injecting the semi-solid metal placed in the mold into the mold and the semi-solid metal in the container built in the plunger so as to be placed along the central axis of the injection sleeve and placed in the injection sleeve. It is equipped with an extrusion mechanism that pushes out into the injection sleeve.

As described above, this die casting injection device is built in the plunger so as to be arranged along the central axis of the injection sleeve, and extrudes the semi-solidified metal in the container arranged in the injection sleeve into the injection sleeve. Provide a mechanism. As a result, the extrusion mechanism can be fixedly arranged at a predetermined position with respect to the injection sleeve, so that the position of the extrusion mechanism is prevented from being moved and scattered with respect to the injection sleeve for each injection molding as in the conventional case. be able to. As a result, the shape of the semi-solidified metal installed in the injection sleeve can be stabilized by the extrusion mechanism. Further, since the extrusion mechanism is built in the plunger, the size of the extrusion mechanism and the plunger combined can be reduced in the direction of the central axis of the plunger.

In the above-mentioned injection device for die casting, preferably, the central axis of the injection sleeve and the central axis of the extrusion mechanism are substantially the same. With this configuration, the semi-solidified metal can be extruded along the central axis of the injection sleeve by the extrusion mechanism, so that the central axis of the extrusion mechanism is eccentric with respect to the central axis of the injection sleeve. Compared with the case, it is possible to prevent the shape of the semi-solid metal from being deformed when the semi-solid metal is installed on the injection sleeve.

In the above-mentioned injection device for die casting, preferably, the extrusion mechanism is arranged in the injection sleeve so as to be able to advance and retreat, and the extrusion portion for extruding the semi-solidified metal in the container arranged in the injection sleeve and the main body for driving the extrusion portion. The plunger has an internal space portion in which the main body portion is built, and a through hole that communicates with the internal space portion on the end face on the injection side and allows the extrusion portion to penetrate. With this configuration, the internal space can secure a space for arranging the main body in the plunger, and the main body built in the plunger can drive the extrusion through the through hole. it can.

In this case, preferably, the plunger has a plunger tip provided with a through hole and a plunger rod provided with an internal space portion. With this configuration, the internal space can be arranged at a position different from that of the plunger tip that comes into direct contact with the high-temperature semi-solid metal. Therefore, it is possible to prevent the main body portion built in the internal space portion from being exposed to a high temperature.

In the configuration in which the plunger includes the plunger tip and the plunger rod, the central axis of the extrusion portion and the central axis of the plunger tip are preferably substantially the same. With this configuration, the semi-solid metal extruded by the extrusion portion and installed on the injection sleeve can be injected into the mold by the plunger tip whose central axis line substantially coincides with the extrusion portion, so that the metal is more stable by the plunger. Then, the semi-solidified metal can be injected into the mold.

In the configuration in which the plunger is provided with an internal space portion and a through hole, preferably, the extrusion portion is provided at the other end of the extrusion rod and the extrusion rod which is passed through the through hole and one end is connected to the main body portion. It has an extruded tip that closes the through hole from the tip side of the plunger. With this configuration, the through hole can be closed by the extrusion tip, so that it is possible to prevent the semi-solidified metal from entering the plunger through the through hole. Further, the extrusion rod can easily connect the main body portion built in the plunger rod and the extrusion tip.

In the above-mentioned injection device for die casting, preferably, the injection sleeve has an opening for arranging the container and the transfer device on the central axis of the injection sleeve in the injection sleeve while the container is held by the transfer device. It is provided. With such a configuration, the container and the transport device can be easily introduced into the injection sleeve through the opening.

In this case, preferably, the opening is at least half of the circumferential direction of the injection sleeve within a predetermined range in the central axis direction of the injection sleeve in which the grip portion provided at the tip of the robot arm portion constituting the transport device is arranged. It has a first opening that cuts out a range. With this configuration, the injection sleeve can be secured with a large introduction port for easily introducing the container and the grip portion into the injection sleeve by the first opening.

In the configuration in which the opening includes the first opening, preferably, the opening is connected to the first opening at one end, and the circumferential direction of the injection sleeve is within a predetermined range in the central axis direction of the injection sleeve in which the container is arranged. It has a second opening that cuts out less than half of the area. With this configuration, by setting the notch range of the injection sleeve to less than half of the circumferential direction, the contact between the injection sleeve and the plunger can be ensured in a range larger than half of the circumferential direction of the injection sleeve. Can be done. As a result, when the plunger moves back and forth in the injection sleeve in the range where the second opening is provided, the plunger can be stably moved along the inner peripheral surface of the injection sleeve.

In the configuration in which the opening includes the second opening, preferably, one opening on the small diameter side of the tapered container is arranged inside the second opening, and the container is inside the first opening. The other opening on the large diameter side of is arranged. With this configuration, the other opening on the large diameter side of the container can be arranged on the side of the first opening having a large notch range in the circumferential direction, so that the space in the injection sleeve can be efficiently used. The container can be placed.

In the above-mentioned injection device for die casting, preferably, the extrusion mechanism has an air cylinder. With such a configuration, the air cylinder can exhibit stable performance in a high temperature environment as compared with an electric or hydraulic extrusion mechanism.

The die casting method according to the second invention is a step of peeling the semi-solid metal from the container by pressing the semi-solid metal contained in the container in close contact from one opening of the container toward the other opening. The process of holding the container containing the peeled semi-solidified metal by a transport device and arranging it on the central axis of the injection sleeve and arranging it on the injection sleeve using the extrusion mechanism built in the plunger. It includes a step of extruding the semi-solidified metal in the container into the injection sleeve and a step of injecting the semi-solidified metal extruded into the injection sleeve into the mold using a plunger.

In this die casting method, as described above, the semi-solid metal is arranged on the central axis of the injection sleeve, and the semi-solid metal in the container arranged in the injection sleeve is injected by using the extrusion mechanism built in the plunger. Extrude into the sleeve. As a result, the extrusion mechanism can be fixedly arranged at a predetermined position with respect to the injection sleeve, so that the position of the extrusion mechanism is prevented from being moved and scattered with respect to the injection sleeve for each injection molding as in the conventional case. be able to. As a result, it is possible to obtain a die casting method capable of stabilizing the shape of the semi-solidified metal installed in the injection sleeve by the extrusion mechanism. Further, since the extrusion mechanism is built in the plunger, it is possible to obtain a die casting method capable of reducing the combined size of the extrusion mechanism and the plunger in the direction of the central axis of the plunger.

According to the present invention, as described above, the shape of the semi-solidified metal installed in the injection sleeve can be stabilized by the extrusion mechanism.

It is a schematic diagram which showed the whole structure of the die-cast molding machine which comprises the injection device for die-cast molding by one Embodiment. It is a figure for demonstrating the container which holds a semi-solidified metal. It is a schematic cross-sectional view which showed the injection sleeve and the plunger of the injection apparatus for die casting according to one Embodiment. It is sectional drawing along the line 500-500 of FIG. It is sectional drawing which follows the line 510-510 of FIG. It is sectional drawing along the line 520-520 of FIG. It is sectional drawing along the line 530-530 of FIG. It is sectional drawing along the line 540-540 of FIG. It is a figure for demonstrating the 1st step of the die casting molding method by one Embodiment. It is a figure for demonstrating the 2nd step of the die casting molding method by one Embodiment. It is a figure for demonstrating the 3rd step of the die casting molding method by one Embodiment. It is a figure for demonstrating the 4th process of the die casting molding method by one Embodiment. It is a figure for demonstrating the 5th step of the die casting molding method by one Embodiment. It is a figure for demonstrating the 6th process of the die casting molding method by one Embodiment.

Hereinafter, embodiments embodying the present invention will be described with reference to the drawings.

[Embodiment]
The configuration of the die casting injection device 100a according to the embodiment will be described with reference to FIGS. 1 to 8. The die casting injection device 100a is one configuration of the die casting machine 100. In each figure, the moving direction of the plunger 2, which will be described later, is the X direction. Further, the direction orthogonal to the X direction in the horizontal plane is defined as the Y direction, and the directions orthogonal to the X direction and the Y direction are defined as the Z direction (vertical direction).

(Structure of die casting machine)
As shown in FIG. 1, a mold 1 is attached to the die casting machine 100. The die-cast molding machine 100 is a device for injecting a semi-solidified metal M into a mold 1 in a molded state by a die-cast molding injection device 100a to form a molded product M0 (see FIG. 14). The die casting machine 100 includes a fixed die plate 101, a moving die plate 102, a moving die plate driving mechanism 103, and an injection device 100a for die casting.

The mold 1 includes a fixed mold 1a and a mobile mold 1b. The fixed mold 1a is attached to and fixed to the fixed die plate 101 of the die casting machine 100. The movable type 1b is attached to and fixed to the moving die plate 102 provided on the X1 direction side of the fixed die plate 101. The fixed die plate 101 is fixed, and the moving die plate 102 is configured to be movable in the X2 direction or the X1 direction by the moving die plate driving mechanism 103. The mobile type 1b is configured to approach or move away from the fixed type 1a as the moving die plate 102 moves.

By bringing the moving mold 1b closer to the fixed mold 1a by the moving die plate drive mechanism 103 and molding the mold, the cavity (cavity portion) 1c for molding the die casting product (molded product) is contained in the mold 1. Is formed. The fixed mold 1a is provided with a runner 1d which is connected to the cavity 1c and serves as a circulation passage for the semi-solidified metal M. The runner 1d extends in the X direction from the mating surface (split surface) 1e of the fixed type 1a with the moving type 1b, and penetrates the fixed type 1a. Further, the runner 1d has a circular shape in a vertical cross section due to a plane orthogonal to the X direction. The semi-solidified metal M is a metal in a phase state in which a solid phase and a liquid phase are mixed.

(Rough configuration of injection device for die casting)
The die-cast molding injection device 100a shown in FIG. 1 is a device for injecting the semi-solidified metal M into the mold 1 in a molded state fixed to the die-cast molding machine 100. The die casting injection device 100a includes a plunger 2, a drive unit 3, an injection sleeve 4, and an air cylinder 5. The air cylinder 5 is an example of an "extrusion mechanism" within the scope of the claims.

The injection sleeve 4 is a cylindrical metal part that communicates with the cavity 1c formed in the mold 1 via the runner 1d. The plunger 2 is configured to move back and forth in the injection sleeve 4 in the X direction by the drive unit 3. The air cylinder 5 is a mechanism for extruding the semi-solidified metal M from the container C containing the semi-solidified metal M arranged in the injection sleeve 4 and installing the semi-solidified metal M in the injection sleeve 4. ..

Here, with reference to FIG. 1, the process of the die casting molding method by the die casting injection apparatus 100a will be briefly described. First, the transfer robot T (see FIG. 2) arranges (installs) the container C in which the semi-solidified metal M is housed in the injection sleeve 4 while being held by the transfer robot T. Next, the semi-solidified metal M is pushed out from the container C by the air cylinder 5, and the semi-solidified metal M is installed in the injection sleeve 4. Next, the transport robot T that grips the empty container C retracts. Finally, as the plunger 2 advances (moves in the X2 direction) toward the fixed mold 1a (runner 1d), the semi-solidified metal M is ejected into the cavity 1c. The details of the die casting method will be described later. The transfer robot T is an example of a "transfer device" within the scope of the claims.

As shown in FIG. 2, the container C has a cylindrical shape with both ends open, and has a tapered shape (reverse taper shape) in which the inner diameter and outer diameter expand from one opening C1 to the other opening C2. That is, the inner diameter d1 of one opening C1 is smaller than the inner diameter d2 of the other opening C2 (d2> d1). Further, on the outer surface of the container C near the other opening C2, a non-tapered portion C3 whose outer diameter does not change within a predetermined range in the direction in which the one opening C1 and the other opening C2 are lined up is provided. There is. The non-tapered shape portion C3 is a portion gripped by the transfer robot T.

The transport robot T includes a grip portion T1 that grips the container C, and a robot arm portion T2 that is provided with a grip portion T1 at the tip. The transport robot T is configured to arrange (install) the container C gripped by the grip portion T1 in the injection sleeve 4 (see FIG. 3) by the robot arm portion T2. Further, the transfer robot T is configured to retract the empty container C from the inside of the injection sleeve 4.

Here, with reference to FIG. 2, the production of the semi-solidified metal M contained in the container C (preparation before die casting) will be briefly described. First, an empty container C is installed on the cooling installation table S so that one opening C1 of the container C comes into contact with the cooling installation table S. The cooling installation table S has a refrigerant passage S1 inside which a refrigerant such as water is circulated. Next, the semi-solidified metal M produced in advance is poured into the empty container C by a radle (not shown) or the like. Next, the cooling installation table S solidifies a part of the semi-solidified metal M stored in the vicinity of the cooling installation table S of the container C to form a solid bottom (solidified metal) M1. At this time, the inside of the container C may be agitated using an electromagnetic agitator (not shown) or the like so that the semi-solidified metal M other than the bottom M1 does not solidify. In the description of the present embodiment, for convenience, the semi-solidified metal portion M2 housed in the container C and the bottom portion M1 which is a solid metal portion housed in the container C are combined to form the semi-solidified metal M. Write.

Hereinafter, each part (plunger 2, drive unit 3, injection sleeve 4, air cylinder 5) constituting the die casting injection device 100a will be described in detail.

(Plunger and drive unit configuration)
As shown in FIG. 1, the plunger 2 is a member inserted into the injection sleeve 4 and for pushing (injecting) the semi-solidified metal M installed in the injection sleeve 4 into the mold 1. The plunger 2 includes a plunger tip 21 detachably fixed to the end in the X1 direction and a plunger rod 22 connected to the plunger tip 21 at the end in the X1 direction and connected to the drive unit 3 at the end in the X2 direction. I'm out. Each part of the plunger 2 is mainly formed of a metal material such as a steel material. The plunger 2 has a straight rod shape as a whole.

The drive unit 3 is connected to the plunger rod 22 and is configured to move the plunger 2 forward and backward into the injection sleeve 4. The drive unit 3 is, for example, a hydraulic cylinder driven by a hydraulic circuit 3a.

The plunger 2 is moved in the horizontal direction (X direction) between the predetermined forward position PF1 and the backward position PB by the drive unit 3. As shown in FIG. 3, in the retracted position PB, the plunger tip 21 is located in the X2 direction with respect to the second sleeve member 42 described later of the injection sleeve 4, and the container C in which the semi-solidified metal M is housed by the transport robot T. Is arranged on the injection sleeve 4. Then, the semi-solidified metal M is installed in the injection sleeve 4 by the air cylinder 5, and after the container C and the transfer robot T are retracted from the injection sleeve 4, the plunger 2 advances in the X1 direction, whereby the plunger chip 21 The extruded semi-solidified metal M is supplied to the cavity 1c (see FIG. 1) via the runner 1d. The forward position PF1 is a position where the injection of the semi-solidified metal M into the cavity 1c is completed. As a result, the plunger 2 is configured to push the semi-solidified metal M in the injection sleeve 4 by the plunger tip 21 and inject it into the cavity 1c of the mold 1.

The plunger tip 21 of the plunger 2 is a member having a thick wall structure and a cylindrical shape, and is arranged in an injection sleeve 4 (see FIG. 1) for introducing the semi-solidified metal M into the mold 1. Further, the plunger tip 21 is provided so as to fit and slide on the inner peripheral surface of the injection sleeve 4. Further, since the plunger tip 21 has wear resistance and heat resistance, it is preferable that the surface of the steel material is coated with a cermet or the like.

The plunger rod 22 is a cylindrical member made of a steel material or the like, and is moved back and forth in the injection sleeve 4 by the drive unit 3 (see FIG. 1).

As shown in FIG. 3, the plunger tip 21 is provided with a through hole 21a penetrating in the X direction at the center. The through hole 21a is configured to allow the extrusion rod 51b, which will be described later, of the air cylinder 5 to pass through. The plunger rod 22 is provided with an internal space portion 22a for incorporating an air cylinder 5 (a main body portion 52 of the air cylinder 5 to be described later). The through hole 21a communicates the internal space portion 22a with the end surface 2a on the injection side (the side where the container C is arranged) (X1 direction side) of the plunger 2.

(Composition of injection sleeve)
As shown in FIG. 3, the injection sleeve 4 is abutted against the surface 1f of the fixed mold 1a opposite to the mating surface 1e from the X1 direction side, and is installed in the die casting machine main body in a state of communicating with the runner 1d. ing. Further, the injection sleeve 4 has an opening at the end in the X2 direction. Further, the injection sleeve 4 is arranged along the horizontal direction (X direction). Further, the central axis α extending in the X direction of the injection sleeve 4 and the central axis of the runner 1d coincide with each other. Further, the inner diameter D1 of the injection sleeve 4 is equal to the inner diameter of the runner 1d.

The injection sleeve 4 is a guide member of the plunger 2 that moves back and forth in the X direction, and is a member for installing the semi-solidified metal M. Further, the inner peripheral surface of the injection sleeve 4 is fitted to the outer peripheral surface of the plunger tip 21 of the plunger 2. That is, the inner diameter D1 of the injection sleeve 4 is substantially equal to (slightly larger) the outer diameter of the plunger tip 21. Further, the central axis α of the injection sleeve 4, the central axis of the plunger 2, and the central axis of the air cylinder 5 are substantially the same.

The injection sleeve 4 includes a first sleeve member 41, a second sleeve member 42, a third sleeve member 43, and a fourth sleeve member 44. As described above, the injection sleeve 4 is configured so that each member can be replaced independently by being composed of a plurality of members.

The first sleeve member 41, the second sleeve member 42, the third sleeve member 43, and the fourth sleeve member 44 are generally arranged from the X2 direction side in this order. The first sleeve member 41 and the second sleeve member 42 are fixed to each other by bolts (not shown). The second sleeve member 42 and the third sleeve member 43 are fixed to each other by bolts (not shown). The third sleeve member 43 and the fourth sleeve member 44 are fixed to each other by bolts (not shown).

As shown in FIG. 4, the first sleeve member 41 has a ring shape and is a member in which an opening at an end portion of the injection sleeve 4 in the X2 direction is formed. The inner diameter of the first sleeve member 41 is D1. Further, the first sleeve member 41 is a portion for introducing the plunger 2 into the injection sleeve 4. In FIG. 3, the inner peripheral surface of the first sleeve member 41 is fitted to the outer peripheral surface of the tip (plunger tip 21) of the plunger 2.

As shown in FIG. 3, the second sleeve member 42 has a central axis α in the second sleeve member 42 in a state where the container C in which the semi-solidified metal M is housed is gripped by the grip portion T1 of the transport robot T. It is configured to be placed on top. Further, the size of the second sleeve member 42 in the X direction is larger than the size of the container C in the X direction (distance between one opening C1 and the other opening C2). Further, the second sleeve member 42 is provided with an opening 421 for introducing the container C and the grip portion T1 into the second sleeve member 42 in order to arrange (install) the container C and the grip portion T1. Further, the second sleeve member 42 is arranged at the first portion 42a having the first opening 421a described later of the opening 421 and the end portion of the first portion 42a in the X2 direction, and the second opening described later of the opening 421. A second portion 42b having a portion 421b and a flange portion 422 arranged at the end in the X1 direction of the first portion are integrally included.

The grip portion T1 of the container C and the transport robot T is configured to be arranged (introduced) in the second sleeve member 42 by being moved from the Y2 direction side of the second sleeve member 42 to the Y1 direction. There is. Further, the container C and the grip portion T1 arranged in the second sleeve member 42 are configured to be retracted from the inside of the second sleeve member 42 by being moved in the Y2 direction.

The opening 421 is generally provided on the Y2 direction side of the second sleeve member 42. That is, as shown in FIGS. 5 to 7, the second sleeve member 42 generally has a shape (half-split shape) in which the Y2 direction side is cut out when viewed from the central axis direction (X direction) of the injection sleeve 4. It is formed.

As shown in FIG. 3, the opening 421 includes a first opening 421a and a second opening 421b. The first opening 421a is connected to the second opening 421b from the fixed mold 1a side, which is one side (X1 direction side) of the injection sleeve 4 in the central axis direction. The second opening 421b and the first opening 421a are the inside of the second sleeve member 42, in which the container C containing the semi-solidified metal M and the gripping portion T1 of the transport robot T that grips the container C are held inside the second sleeve member 42. It is an introduction port part from the outside for arranging (installing) in. The arrangement (installation) position of the container C and the grip portion T1 on the second sleeve member 42 will be described later.

As shown in FIGS. 5 and 6, the second opening 421b is provided in a predetermined range including the end portion of the second sleeve member 42 in the X2 direction in the central axis direction (X direction) of the injection sleeve 4. Further, the second opening 421b is cut out in a range of less than half of the circumferential direction of the second sleeve member 42 when viewed from the central axis direction (X direction) of the injection sleeve 4. Further, the second opening 421b is cut out in a range of 90 degrees or more in the circumferential direction of the second sleeve member 42 when viewed from the central axis direction (X direction) of the injection sleeve 4. As a result, the second sleeve member 42 has a C shape when viewed from the central axis direction (X direction) of the injection sleeve 4 in the range in which the second opening 421b in the central axis direction (X direction) of the injection sleeve 4 is provided. It is formed in a shape. As an example, in FIGS. 5 and 6, the second opening 421b is cut out in a range of about 140 degrees.

As shown in FIG. 3, the first opening 421a is provided in a predetermined range sandwiched between the second opening 421b and the flange portion 422 in the central axis direction (X direction) of the injection sleeve 4. Further, the first opening 421a is cut out in a range of more than half of the circumferential direction of the second sleeve member 42 when viewed from the central axis direction (X direction) of the injection sleeve 4. As a result, the second sleeve member 42 is laterally oriented when viewed from the central axis direction (X direction) of the injection sleeve 4 in the range in which the first opening 421a in the central axis direction (X direction) of the injection sleeve 4 is provided. It is formed in an arch shape. As an example, in FIG. 7, the first opening 421a is cut out in a range of about 230 degrees.

As shown in FIG. 3, in the central axis direction (X direction) of the injection sleeve 4, the inner diameter of the second sleeve member 42 in the range where the second opening 421b is provided is D1. Further, the inner diameter of the injection sleeve 4 on the flange portion 422 side of the first opening 421a is D1. Further, in the central axis direction (X direction) of the injection sleeve 4, the inner diameter of the second sleeve member 42 in the range where the first opening 421a is provided (assuming a virtual circle indicated by a two-dot chain line) is larger than that of D1. Large D2 (see FIG. 7).

In short, in the range in the X direction in which the first opening 421a is provided, the inner diameter D2 of the second sleeve member 42 is larger than the inner diameter D1 of the other portion of the injection sleeve 4. Therefore, the second sleeve member 42 is configured so that the inner peripheral surface 421c of the inner diameter D2 does not come into contact with the plunger tip 21 in the X-direction range in which the first opening 421a is provided.

Here, the width W1 of the first opening 421a in the X direction is smaller than the width W2 of the plunger tip 21 (contact surface of the plunger tip 21 with the injection sleeve 4) in the X direction of the plunger 2 (W2> W1). Therefore, the second sleeve member 42 is configured to maintain contact with the inner peripheral surface of the inner diameter D1 of the injection sleeve 4 when the plunger tip 21 passes through the range in the X direction in which the first opening 421a is provided. Has been done. As a result, the second sleeve member 42 prevents the plunger tip 21 from coming off in the direction intersecting the first opening 421a in the X direction when the plunger tip 21 moves in the X direction.

Inside the first opening 421a (small inner diameter D1 side) of the second sleeve member 42, one opening C1 on the small diameter side of the tapered container C is arranged. Inside the second opening 421b (large inner diameter D2 side) of the second sleeve member 42, the other opening C2 on the large diameter side of the tapered container C is arranged. In this state, the end of the container C in the X1 direction is in contact with the end of the third sleeve member 43 in the X2 direction. Further, one opening C1 on the small diameter side of the container C is arranged to face the plunger rod 22 and the extrusion tip 51a described later of the air cylinder 5 in the X direction. Further, a grip portion T1 of the transport robot T that grips the container C is arranged on the outer peripheral side of the inside (large inner diameter D2 side) of the second opening 421b of the second sleeve member 42.

The flange portion 422 of the second sleeve member 42 is formed in an annular shape. Further, the flange portion 422 has a third sleeve member 43 fitted on the inner peripheral surface thereof.

The end of the third sleeve member 43 in the X1 direction directly communicates with the runner 1d. Further, the third sleeve member 43 generally has a cylindrical shape. In the third sleeve member 43, the third sleeve member 43 is fitted on the outer peripheral surface near the end on the X2 direction side, and the fourth sleeve member 44 is fitted on the outer peripheral surface near the end on the X1 direction side. ing. The fourth sleeve member 44 is formed in a cylindrical shape, and the end portion in the X1 direction is in contact with the fixed mold 1a.

As shown in FIG. 8, the third sleeve member 43 has an inner diameter D1. That is, the third sleeve member 43 has an inner peripheral surface along the inner arc of the second portion 42b shown in FIG.

(Air cylinder configuration)
As shown in FIG. 3, the air cylinder 5 is built in the plunger 2 so as to be arranged along the central axis α of the injection sleeve 4, and pushes out the semi-solidified metal M in the container C arranged in the injection sleeve 4. As a result, the semi-solidified metal M is configured to be installed in the injection sleeve 4.

The air cylinder 5 includes an extrusion portion 51 and a main body portion (air cylinder main body portion) 52.

The extrusion portion 51 is arranged so as to be able to advance and retreat in the injection sleeve 4, and is configured to extrude the semi-solidified metal M in the container C arranged in the injection sleeve 4. The extrusion portion 51 is formed to be smaller than the one opening C1 on the small diameter side of the container C arranged in the second sleeve member 42 when viewed from the central axis α direction (X direction) of the injection sleeve 4.

The main body 52 is built in the internal space 22a of the plunger rod 22. The extrusion portion 51 has an extrusion tip 51a and an extrusion rod 51b, and is a portion that is moved in the X direction by the main body portion 52.

The extrusion rod 51b is passed through a through hole 21a of the plunger tip 21 and one end in the X2 direction is connected to the main body 52. The extrusion tip 51a is provided at the other end of the extrusion rod 51b in the X1 direction, and is configured to close the through hole 21a from the tip of the plunger 2. That is, the extruded tip 51a overlaps (overlaps) at least the entire area of the through hole 21a when viewed from the central axis α direction (X direction) of the injection sleeve 4, and is formed larger than the through hole 21a. ing. Further, the extruded tip 51a is formed to be smaller than one opening C1 on the small diameter side of the container C when viewed from the central axis α direction (X direction) of the injection sleeve 4.

The contact surface of the extruded tip 51a with the plunger tip 21 is provided so as to surround the entire circumference of the end portion of the through hole 21a in the X1 direction. As a result, when the extruded tip 51a and the plunger tip 21 are in contact with each other, the semi-solidified metal M does not enter the plunger through the through hole 21a.

The main body 52 is connected to the extrusion rod 51b and is configured to move the extrusion 51 back and forth within the injection sleeve 4. The extrusion portion 51 (extrusion tip 51a) is moved in the horizontal direction (X direction) between the predetermined forward position PF2 and the backward position PB by the main body portion 52. In the retracted position PB, the extruded tip 51a is located at the end of the second opening 421b of the second sleeve member 42 in the X2 direction, and the container C in which the semi-solidified metal M is housed by the transport robot T is the injection sleeve 4 (the second sleeve member 42). 2 Arranged on the sleeve member 42). Then, when the extruded tip 51a advances in the X1 direction, the semi-solidified metal M is extruded from the container C by the extruded tip 51a, and the semi-solidified metal M is installed in the third sleeve member 43. The forward position PF2 of the extruded tip 51a shown by the broken line in FIG. 3 is the position where the extrusion operation of the semi-solidified metal M is completed, and the tip of the extruded tip 51a slightly protrudes from the other opening C2 on the large diameter side of the container C. The position.

(Process of die casting molding method)
Next, the steps of the die casting method by the die casting injection device 100a will be described with reference to FIGS. 9 to 14. Hereinafter, the steps of the die casting method will be described by dividing them into six steps of the first to sixth steps. The six steps are performed in the order of the first step, the second step, the third step, the fourth step, the fifth step, and the sixth step.

[First step]
The first step shown in FIG. 9 is a step of peeling the semi-solidified metal M in close contact with the container C from the container C. Specifically, in the first step, the container C containing the semi-solid metal M including the bottom M1 (solidified metal) is gripped by the grip portion T1 of the transport robot T, and is gripped on the large diameter side of the container C (the other). The end portion (on the side of the opening C2) is held in a state of being pressed against a flat wall surface P1 (such as a jig). Then, in the first step, the bottom portion M1 (solidified metal) housed in the container C is pressed toward the other opening C2 on the large diameter side by the peeling pressing portion P2 from the one opening C1 on the small diameter side of the container C. As a result, the semi-solidified metal M is peeled off from the container C. That is, the strong adhesion between the container C and the semi-solidified metal M is released. The wall surface P1 and the peeling pressing portion P2 may be one configuration of the die casting injection device 100a, or may be provided in a dedicated device different from the die casting injection device 100a.

[Second step]
The second step shown in FIG. 10 is a step of arranging the container C containing the semi-solidified metal M in the injection sleeve 4. Specifically, in the second step, the container C containing the semi-solidified metal M peeled off in the first step is gripped by the grip portion T1 of the transport robot T, and the robot arm portion of the transport robot T. It is arranged on the central axis α of the injection sleeve 4 by T2. At this time, one opening C1 on the small diameter side of the container C is arranged inside the second opening 421b (small inner diameter D1 side) of the second sleeve member 42, and the other opening C2 on the large diameter side of the container C, The grip portion T1 of the transfer robot T is arranged inside the first opening 421a of the second sleeve member 42 (on the large inner diameter D2 side). Further, the transfer robot T arranges the container C so that the central axis α of the injection sleeve 4 and the central axis of the container C substantially coincide with each other. In the second step, both the plunger tip 21 and the extrusion tip 51a are arranged at the retracted position PB (near the end of the injection sleeve 4 in the X2 direction).

[Third step]
The third step shown in FIG. 11 is a step of pushing the semi-solidified metal M out of the container C by the air cylinder 5 and installing the semi-solidified metal M in the injection sleeve 4. Specifically, in the third step, the extruded tip 51a and the extruded rod 51b advance in the X1 direction, enter the container C and move to the advancing position PF2, whereby the semi-solidified metal M is extruded from the container C. The extruded semi-solidified metal M is installed on the third sleeve member 43. At this time, the bottom portion M1 (solidified metal) is located at the end portion of the semi-solidified metal M in the X2 direction (rearward in the injection direction).

[4th step]
In the fourth step shown in FIG. 12, the extrusion tip 51a and the extrusion rod 51b arranged in the empty container C are pulled out from the container C. Then, the extruded tip 51a is moved to the retracted position PB, and the extruded tip 51a closes the through hole 21a of the plunger rod 22 from the X1 direction side.

[Fifth step]
In the fifth step shown in FIG. 13, the empty container C gripped by the grip portion T1 of the transport robot T is retracted from the injection sleeve 4 by the robot arm portion T2 of the transport robot T. As a result, a space for the plunger 2 to move forward and backward is secured in the injection sleeve 4. The mold 1 is clamped at any time before moving to the sixth step.

[Sixth step]
The sixth step shown in FIG. 14 is a step of injecting the semi-solidified metal M into the mold 1, and is the final step of the die casting method. Specifically, in the sixth step, the plunger rod 22 and the plunger tip 21 are advanced in the X1 direction by the drive unit 3 and move to the forward position PF1. Then, the semi-solidified metal M extruded by the air cylinder 5 and installed in the injection sleeve 4 in the third step is injected into the mold 1 by the plunger tip 21. At this time, since the bottom portion M1 (solidified metal) is located at the end of the semi-solidified metal M in the X2 direction, the bottom portion M1 is moved in the X1 direction in a state of being substantially in contact with the plunger tip 21. Therefore, the semi-solidified metal M having fluidity is introduced into the cavity 1c before the bottom M1, and the semi-solidified metal M is introduced into the cavity 1c at the bottom M1. Does not interfere.

(Effect of embodiment)
The effects of this embodiment will be described below.

In the present embodiment, as described above, the semi-solidified metal M in the container C incorporated in the plunger 2 so as to be arranged along the central axis α of the injection sleeve 4 and arranged in the injection sleeve 4 is injected into the injection sleeve 4. An air cylinder 5 to be pushed in is provided. As a result, the air cylinder 5 can be fixedly arranged at a predetermined position with respect to the injection sleeve 4, so that the position of the air cylinder 5 is moved with respect to the injection sleeve 4 for each injection molding and varies as in the conventional case. Can be prevented. As a result, the shape of the semi-solidified metal M installed in the injection sleeve 4 can be stabilized by the air cylinder 5. Further, since the air cylinder 5 is built in the plunger 2, the combined size of the air cylinder 5 and the plunger 2 can be reduced in the direction of the central axis of the plunger 2. Further, the air cylinder can exhibit stable performance in a high temperature environment as compared with a mechanism for pushing out a semi-solidified metal M such as an electric type or a hydraulic type.

Further, in the present embodiment, as described above, the central axis α of the injection sleeve 4 and the central axis of the air cylinder 5 are substantially coincident with each other. As a result, the semi-solidified metal M can be pushed out by the air cylinder 5 along the central axis α of the injection sleeve 4, so that the central axis of the air cylinder 5 is deviated from the central axis of the injection sleeve 4. It is possible to prevent the shape of the semi-solid metal M from collapsing when the semi-solid metal M is installed on the injection sleeve 4 as compared with the case where the semi-solid metal M is installed.

Further, in the present embodiment, as described above, the air cylinder 5 is arranged in the injection sleeve 4 so as to be able to advance and retreat, and the extruded portion 51 for pushing out the semi-solidified metal M in the container C arranged in the injection sleeve 4 is provided. A main body 52 for driving the extrusion 51 is provided, and the plunger 2 communicates with the internal space 22a in which the main body 52 is built and the end surface 2a on the injection side communicates with the internal space 22a, and the extrusion 51 penetrates. A through hole 21a is provided. As a result, the internal space portion 22a can secure a space for arranging the main body portion 52 in the plunger 2, and the main body portion 52 built in the plunger 2 drives the extrusion portion 51 through the through hole 21a. Can be made to.

Further, in the present embodiment, as described above, the plunger 2 is provided with the plunger tip 21 having the through hole 21a and the plunger rod 22 having the internal space portion 22a. As a result, the internal space portion 22a can be arranged at a position different from that of the plunger tip 21 that comes into direct contact with the high-temperature semi-solidified metal M. Therefore, it is possible to prevent the main body 52 built in the internal space 22a from being exposed to a high temperature.

Further, in the present embodiment, as described above, the central axis of the extrusion section 51 and the central axis α of the plunger tip 21 are substantially coincident with each other. As a result, the semi-solid metal M extruded by the extrusion portion 51 and installed in the injection sleeve 4 can be injected into the mold 1 by the plunger tip 21 whose central axis line substantially coincides with the extrusion portion 51. 2 allows the semi-solidified metal M to be stably injected into the mold 1.

Further, in the present embodiment, as described above, the extrusion rod 51b is passed through the through hole 21a through the extrusion portion 51 and one end thereof is connected to the main body portion 52, and the extrusion rod 51b is arranged at the other end of the extrusion rod 51b and has a through hole. An extruded tip 51a that closes the 21a from the tip side of the plunger 2 is provided. As a result, the through hole 21a can be closed by the extrusion tip 51a, so that it is possible to prevent the semi-solidified metal M from entering the plunger 2 through the through hole 21a. Further, the extrusion rod 51b can easily connect the main body 52 built in the plunger rod 22 and the extrusion tip 51a.

Further, in the present embodiment, as described above, with the container C held by the transfer robot T in the injection sleeve 4, the container C and the transfer robot T are placed on the central axis of the injection sleeve 4 in the injection sleeve 4. An opening 421 for arranging on the line is provided. As a result, the container C and the transfer robot T can be easily introduced into the injection sleeve 4 through the opening 421.

Further, in the present embodiment, as described above, a predetermined position in the central axis direction of the injection sleeve 4 in which the grip portion T1 provided at the tip of the robot arm portion T2 constituting the transport robot T is arranged in the opening 421. A first opening 421a is provided which cuts out a range of more than half of the injection sleeve 4 in the circumferential direction. Thereby, a large introduction port for easily introducing the container C and the grip portion T1 into the injection sleeve 4 can be secured in the injection sleeve 4 by the first opening 421a.

Further, in the present embodiment, as described above, the circumference of the injection sleeve 4 is connected to the opening 421 at one end to the first opening 421a, and the circumference of the injection sleeve 4 is within a predetermined range in the central axis direction of the injection sleeve 4 in which the container C is arranged. A second opening 421b is provided that cuts out a range less than half in the direction. As a result, by setting the notch range of the injection sleeve 4 to less than half of the circumferential direction, the contact between the injection sleeve 4 and the plunger 2 is ensured in a range larger than half of the circumferential direction of the injection sleeve 4. Can be done. As a result, when the plunger 2 moves back and forth in the injection sleeve 4 in the range where the second opening 421b is provided, the plunger 2 can be stably moved along the inner peripheral surface of the injection sleeve 4.

Further, in the present embodiment, as described above, one opening C1 on the small diameter side of the tapered container C is arranged inside the second opening 421b, and the container C is placed inside the first opening 421a. The other opening C2 on the large diameter side is arranged. As a result, the other opening C2 on the large diameter side of the container C can be arranged on the side of the first opening 421a having a large notch range in the circumferential direction, so that the space in the injection sleeve 4 can be efficiently used. The container C can be arranged.

[Modification example]
The embodiments disclosed this time should be considered as exemplary in all respects and not restrictive. The scope of the present invention is shown not by the description of the above embodiment but by the scope of claims, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims.

For example, in the above embodiment, an example in which the injection sleeve is composed of a plurality of members has been shown, but the present invention is not limited to this. In the present invention, the injection sleeve may be composed of a single member.

Further, in the above embodiment, an example in which the extrusion mechanism is composed of an air cylinder is shown, but the present invention is not limited to this. In the present invention, the extrusion mechanism may be configured to have a configuration other than an air cylinder such as a hydraulic cylinder or a motor.

Further, in the above embodiment, an example is shown in which the through hole of the plunger tip is closed by the extrusion tip, but the present invention is not limited to this. In the present invention, the through hole of the plunger tip may be closed by the extrusion rod without providing the extrusion tip in the extrusion mechanism.

Further, in the above embodiment, an example is shown in which the first opening is configured to cut out a range of more than half of the circumferential direction of the injection sleeve when viewed from the central axis direction of the injection sleeve. Not limited. In the present invention, the first opening may be configured to cut out a range of less than half of the circumferential direction of the injection sleeve when viewed from the central axis direction of the injection sleeve.

Further, in the above embodiment, an example is shown in which the second opening is configured to cut out a range of less than half of the circumferential direction of the injection sleeve when viewed from the central axis direction of the injection sleeve. Not limited. In the present invention, the second opening may be configured to cut out a range of half or more in the circumferential direction of the injection sleeve when viewed from the central axis direction of the injection sleeve.

Further, in the above embodiment, the semi-solidified metal contained in the container in close contact is pressed from one opening of the container toward the other opening by a configuration different from the pressing mechanism, whereby the semi-solid metal is pressed into the container. Although an example in which a step of peeling from the metal is provided is shown, the present invention is not limited to this. In the present invention, the semi-solid metal may be peeled off from the container by pressing the semi-solid metal contained in the container in close contact with the container from one opening to the other opening.

Further, in the above embodiment, an example is shown in which the central axis of the injection sleeve and the central axis of the extrusion mechanism are configured to substantially coincide with each other, but the present invention is not limited to this. In the present invention, the central axis of the injection sleeve and the central axis of the extrusion mechanism may be deviated from each other.

Further, in the above embodiment, an example is shown in which the central axis of the extrusion portion and the central axis of the plunger tip are configured to substantially coincide with each other, but the present invention is not limited to this. In the present invention, the central axis of the extrusion portion and the central axis of the plunger tip may be deviated from each other.

1 Mold 2 Plunger 2a Injection side end face 4 Injection sleeve 5 Air cylinder (extrusion mechanism)
21 Plunger tip 21a Through hole 22 Plunger rod 22a Internal space 51 Extrusion part 51a Extrusion tip 51b Extrusion rod 52 Main body 100a Die casting injection device 421 Opening 421a First opening 421b Second opening C Container C1 One side opening C2 Opposite opening M Semi-solidified metal T Transfer robot (transfer device)
T1 Robot arm part T2 Grip part α Central axis of injection sleeve

Claims (12)

An injection sleeve in which a tubular container containing semi-solidified metal can be placed while being held by a transport device, and
A plunger for injecting the semi-solidified metal arranged in the injection sleeve into a mold, and
A die cast comprising an extrusion mechanism incorporated in the plunger so as to be arranged along the central axis of the injection sleeve and extruding the semi-solidified metal in the container arranged in the injection sleeve into the injection sleeve. Injection device for molding. The injection device for die casting according to claim 1, wherein the central axis of the injection sleeve and the central axis of the extrusion mechanism substantially coincide with each other. The extrusion mechanism is disposed in the injection sleeve so as to be able to advance and retreat, and has an extrusion portion for extruding the semi-solidified metal in the container arranged in the injection sleeve, and a main body portion for driving the extrusion portion. ,
According to claim 1 or 2, the plunger has an internal space portion incorporating the main body portion and a through hole communicating with the internal space portion on the end face on the injection side and through which the extruded portion penetrates. The injection device for die casting described. The injection device for die casting according to claim 3, wherein the plunger has a plunger tip provided with the through hole and a plunger rod provided with the internal space portion. The injection device for die casting according to claim 4, wherein the central axis of the extrusion portion and the central axis of the plunger tip substantially coincide with each other. The extrusion portion includes an extrusion rod that is passed through the through hole and one end of which is connected to the main body portion, and an extrusion tip that is provided at the other end of the extrusion rod and closes the through hole from the tip end side of the plunger. The injection device for die casting according to any one of claims 3 to 5. The injection sleeve is provided with an opening for arranging the container and the transport device on the central axis of the injection sleeve in the injection sleeve while the container is held by the transport device. The injection device for die casting according to any one of claims 1 to 6. The opening cuts a range of half or more in the circumferential direction of the injection sleeve within a predetermined range in the central axis direction of the injection sleeve in which the grip portion provided at the tip of the robot arm portion constituting the transport device is arranged. The injection device for die casting according to claim 7, which has a missing first opening. The opening is a second opening in which one end is connected to the first opening and a range of less than half of the circumferential direction of the injection sleeve is cut out in a predetermined range in the central axis direction of the injection sleeve in which the container is arranged. The injection device for die casting according to claim 8, which has a portion. Inside the second opening, one opening on the small diameter side of the tapered container is arranged, and inside the first opening, the other opening on the large diameter side of the container is arranged. The injection device for die casting according to claim 9. The die casting injection device according to any one of claims 1 to 10, wherein the extrusion mechanism has an air cylinder. A step of peeling the semi-solidified metal from the container by pressing the semi-solidified metal contained in the container in close contact from one opening of the container toward the other opening.
A step of holding the container containing the peeled semi-solidified metal by a transport device and arranging it on the central axis of the injection sleeve.
A step of extruding the semi-solidified metal in the container arranged in the injection sleeve into the injection sleeve by using an extrusion mechanism built in the plunger.
A die casting method comprising a step of injecting the semi-solidified metal extruded into the injection sleeve into a mold using the plunger.

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