JP2013176790A - Gate breaking device of die casting molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support capable of supporting a product part in a preferable state, in a gate breaking device for breaking a gate part by pushing an overflow part from above by a pusher.SOLUTION: A gate breaking device 20 includes: a clamp mechanism 30 for holding a biscuit part Wof a die casting molded article W; a lifting unit 31 disposed above the die casting molded article W; and a support 32 arranged from below the die casting molded article W. The lifting unit 31 has a pusher 61 that extends toward an overflow part W. When the lifting unit 31 is lowered, a lower end of the pusher 61 is abutted to the overflow part Wand pushes the overflow part Wdownwards and thus, a gate part Won an overflow side is broken. The support 32 is composed of a shape variable member 32b to be deformed following the contour of a product part W, and the product part Wof the die casting molded article W is supported by an upper surface 32c of the shape variable member 32b.

Description

  The present invention relates to a weir folding device for removing an unnecessary portion other than a product portion from a cast die cast product, and more particularly to a support for supporting the product portion.

  In an example of a die casting machine, after a molten metal is supplied into a sleeve, the molten metal in the sleeve is injected into a cavity in a mold at a high speed and high pressure by a plunger (also called a shot piston or a chip). ing. The die-cast molded product cooled and solidified in the cavity is taken out from the mold when the mold is opened. The die-cast product taken out from the mold includes a so-called “large burr” such as a product portion and a spout-side solidified portion and an overflow portion solidified integrally with the product portion around the product portion. The gate side solidified part includes a biscuit part and a runner part. Further, burrs may be formed around the product portion along the mating surfaces (parting lines) between the molds. Such burrs are removed by finishing processing such as buffing or grinder.

  An apparatus disclosed in Patent Document 1 is known in order to separate “large burrs” such as the spout side solidification part and overflow part from the product part. The device of Patent Document 1 supports a lower part of a die-cast product with a presser equipped with an actuator such as a servo motor or a cylinder, and breaks the overflow side weir part with a chipping hammer when removing the overflow part. In order to remove the gate side solidified portion, the tipping hammer is moved in the horizontal direction or the like, and then the gate side dam portion is broken by the chipping hammer.

JP 2000-326066 A

  As in Patent Document 1, in a device that supports a die-cast molded product with a presser equipped with an actuator such as a servo motor or a cylinder, depending on the shape of the die-cast molded product, the program for operating the servo motor or the expansion / contraction distance of the cylinder This requires time-consuming preparations such as adjustment, and there is a problem that it takes time to make prior adjustments.

  Therefore, instead of using an actuator such as a servo motor or cylinder, a support means has been conceived in which a die-cast product is simply placed on a support base having a simple configuration. However, since the overflow part of the die cast product is formed on one side (opposite to the gate) of the peripheral part of the product part, when used in a weir folding device that pushes the overflow part from above with a pusher and breaks it, When the pusher comes into contact with the upper surface of the overflow portion and moves further downward, a lateral moment acts on the die-cast molded product as the overflow portion bends downward, and as a result, the lower surface of the die-cast molded product and the upper surface of the support base are moved. There was a risk of rubbing and scratching the die cast product.

  Accordingly, an object of the present invention is to provide a die-cast molded product including a support body having a simple structure capable of supporting a product part in a preferable state in a weir folding device that pushes an overflow part from above with a pusher to break the weir part. It is to provide a weir folding device.

  The weir folding device according to the present invention includes a clamp mechanism that holds an inflow side solidified portion of a cast die-cast product, and an upper portion of the die-cast product that is held by the clamp mechanism toward an overflow portion of the die-cast product. A lifting unit having a pusher that protrudes upward and downward, and a lifting mechanism that moves the lifting unit in a vertical direction. The lower end of the pusher is lowered by lowering the lifting unit with respect to a die-cast molded product held by the clamp mechanism. And an elevating mechanism for breaking the overflow weir portion by pushing the overflow portion downward by the pusher, and the elevating unit descends so that the pusher contacts the upper surface of the product portion of the die cast product. The product part is supported from below under the condition It has and a lifting member. The support includes a shape variable member that deforms following the outline of the product portion, and the upper surface of the shape variable member is deformed into a shape corresponding to the lower surface of the product portion to support the product portion.

  According to the present invention, when the pusher descends and hits the overflow part and further descends, the overflow side weir part is broken, and is deformed into a shape corresponding to the lower surface of the product part of the die cast product. The product portion is supported by the upper surface of the shape variable member. For this reason, when the dam on the overflow side is broken by the pusher, the product part can be prevented from moving even if a force that causes the die cast product to move in the lateral direction, etc., even if it moves, the variable shape member moves. Therefore, it is possible to avoid scratches caused by the support rubbing against the product part. Moreover, since the shape-variable member of the support can be applied to product parts having various shapes, pre-adjustment performed according to the product parts is simplified, and the time required for preparation for the weir folding work can be shortened.

The side view which shows typically the weir folding apparatus and die-cast molded product which concern on one Embodiment of this invention. Sectional drawing which shows a part of die-casting machine. Sectional drawing which follows the parting line of a die-cast molded product. The perspective view which looked at the raising / lowering unit of the dam folding apparatus shown by FIG. 1 from the downward direction. The bottom view which shows the positional relationship of the pusher of the raising / lowering unit shown by FIG. 4, and a die-cast molded product. The flowchart which shows the flow of the weir folding process by the said weir folding apparatus. The side view which shows typically the state by which the die-cast molded product was carried in to the weir folding apparatus. The side view which shows typically the state which the support body advanced. The side view which shows typically the state which the raising / lowering unit advanced. The side view which shows typically the state which the raising / lowering unit fell to 1st height. The side view which shows typically the state which the support body retracted. The side view which shows typically the state which the raising / lowering unit fell to 2nd height.

Hereinafter, a weir folding device according to one embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows a die cast product W and a weir folding device 20. The die-cast molded product W is cast in advance by, for example, a die-cast molding machine 1 partially shown in FIG.

  FIG. 2 schematically shows an example of the die casting machine 1. The die casting machine 1 includes a fixed die plate 2 and a moving die plate 3. A fixed die 4 is attached to the fixed die plate 2. A moving die 5 is attached to the moving die plate 3. In a state where the molds 4 and 5 are closed, a cavity 6 having a shape corresponding to the die cast product W is formed between the molds 4 and 5. The cavity 6 communicates with the molten metal supply mechanism 10 through a gate 7 that is a gate and a runner 8 that is a runner.

  The molten metal supply mechanism 10 includes a sleeve 11, a plunger 13 having a plunger tip 12 inserted into the sleeve 11, a drive source (not shown) for driving the plunger 13, and the like. After the molten metal is supplied from the pouring port 14 into the sleeve 11, the plunger 13 moves forward so that the molten metal in the sleeve 11 is supplied to the cavity 6 through the runner 8 and the gate 7. When this molten metal is solidified in the cavity 6, the die cast product W is cast.

  An overflow space 15 is formed above the cavity 6. A part of the molten metal flowing into the cavity 6 enters the overflow space 15 and solidifies. A part of the molten metal remains between the tip end surface of the plunger tip 12 and the runner 8 and solidifies.

For this reason, the die-cast molded product W cast by the die-cast molding machine 1 is, as shown in an example in FIG. 3, an overflow that is solidified integrally with the product part W ₁ and the product part W ₁ around the product part W ₁ . and part _{W 2,} and a sprue-side solidified portion _{W 3.} Between the product portion W ₁ and the overflow portion W _2, dam portions W ₄ of the overflow side of the shape that narrows the cross-sectional area is formed.

Sprue side solidified portion _{W 3} being includes a biscuit section _{W 5,} and a runner portion _{W 6.} Biscuit section W ₅ is obtained by solidifying with the end face of the plunger tip 12 (shown in FIG. 2). Between the product portion W ₁ and the runner portion W _6, dam W ₇ of the sprue side of the shape that narrows the cross-sectional area is formed. The overflow side weir part W ₄ and the gate side weir part W ₇ are examples of weirs to be broken by the weir folding device 20. In addition, although a burr | flash may arise along the mating surface (parting line X) of the metal mold | dies 4 and 5, such a burr | flash is removed by the finishing process by buffing, a grinder, etc.

  A dam folding device 20 shown in FIG. 1 includes a clamp mechanism 30 that holds a die-cast molded product W, an elevating unit 31 that is disposed above the die-cast molded product W, and a support body 32 that is disposed below the die-cast molded product W. And a controller 33 functioning as a control unit. The controller 33 incorporates a computer program and a memory for electrically controlling the weir folding device 20 in accordance with the die cast product W.

The clamp mechanism 30 includes chucks 40 and 41 that can be opened and closed, and a chuck drive mechanism 42 that drives the chucks 40 and 41. For example, an industrial robot can be used as the chuck driving mechanism 42, and the die cast product W held by the chucks 40 and 41 is directed to a desired position in the vertical direction (the direction indicated by the arrow A in FIG. 1) and in the horizontal direction (see FIG. 1 (in the direction indicated by the arrow B). Closing the chuck 40 and 41, the biscuit section _{W 5} of the die casting product W is held, it opened the chuck 40 and 41, the biscuit section _{W 5} is released. The chuck drive mechanism 42 is controlled by the controller 33, for example.

The elevating unit 31 is reciprocated in the vertical direction (the direction indicated by the arrow C in FIG. 1) by the elevating mechanism 50. The elevating mechanism 50 has, for example, a two-stage cylinder 51 that expands and contracts in the vertical direction. From the initial position H ₀ shown in FIG. 9, the first height H ₁ shown in FIG. 10 and the first height H ₁ The lift unit 31 is moved in a two-stage stroke over a second height H ₂ (shown in FIG. 12).

As the lifting mechanism 50, an actuator other than the two-stage cylinder 51, for example, a ball screw and a servo motor may be used, or a linear motor that moves in the vertical direction may be used. In short, what is necessary is just to be able to move between the first height H ₁ and the second height H ₂ from the initial position H ₀ . The elevating unit 31 can be moved in the horizontal direction (the direction indicated by the arrow D in FIG. 1) by the positioning mechanism 52. The lifting mechanism 50 and the positioning mechanism 52 are controlled by the controller 33.

  FIG. 4 is a perspective view of the lifting unit 31 as viewed from below. The lifting unit 31 has a base 56 fixed to the frame 55. A plurality of mounting holes 60 are formed in the base 56 at predetermined pitches P1 and P2 in the horizontal direction. An example of each mounting hole 60 is a screw hole that penetrates the base 56 in the vertical direction.

  A plurality of (for example, three) first pushers 61 and one second pusher 62 are attached to the lower surface side of the base 56. Both the first pusher 61 and the second pusher 62 protrude downward from the lower surface of the base 56. As shown in FIG. 1, the length L <b> 1 of the first pusher 61 is larger than the length L <b> 2 of the second pusher 62.

The first pusher 61 is provided at a position corresponding to the overflow portion W < _b > ₂ of the die-cast molded product W held by the clamp mechanism 30. That is, the first pusher 61, among the plurality of mounting holes 60 formed in the base 56, and select and insert the mounting hole 60 at positions corresponding overflow section W _2, by screwing, is fixed to the base 56 ing. Thus the form of the overflow portion W ₂ can correspond to different types of die-cast moldings.

  An example of the first pusher 61 is a hexagon socket head cap screw having a hexagon socket 70 at the head. When the first pusher 61 is attached to the base 56, the first pusher 61 is rotated by a hexagon stick wrench. The screw portion 71 can be screwed into the mounting hole 60.

The length L1 of the first pusher 61, the lifting unit 31 but does not reach the upper surface of the overflow section W ₂ when in the initial position H _{0 (shown} in FIG. 9), the lifting unit 31 is a first height H ₁ are sized to be able when lowered to (shown in FIG. 10) on the upper surface of the overflow portion W ₂ abuts press butted an overflow section W ₂ downward. The number of the first pusher 61 is not limited to three, it may be provided on base 56 short depending on the number and shape of the overflow portion W _2. Further, the lengths L1 of the plurality of first pushers 61 may be different from each other.

The second pusher 62 is provided at a position corresponding to the product part W ₁ of the die cast product W. The second pusher 62 also has a screw portion 75, and is fixed to the base 56 by screwing the screw portion 75 by selecting one of the mounting holes 60 of the base 56. That is, the second pusher 62, of the large number of mounting holes 60 formed in the base 56, and select and insert the mounting hole 60 at positions corresponding with the product portion W _1, by screwing, it is fixed to the base 56 ing. Therefore it is possible to form the product portion W ₁ corresponding to the different types of die-cast moldings.

The length L2 of the second pusher 62 is lift unit 31 does not reach the upper surface of the product portion W ₁ when in a first height H _{1 (FIG.} 10), the lifting unit 31 is the second high is H ₂ are sized to be able when lowered to _(shown in FIG. 12) to contact with the upper surface of the product portion W ₁ equivalent by pressing toward the product portion W ₁ downward.

The lower end of the second pusher 62, in order to avoid damaging the product portion W ₁ when in contact with the product portion W _1, (4) the protection member 76 of the heat resistance having a certain degree of elasticity Is provided. The second pusher 62 is provided with an operating portion 77 that is held by a tool such as a wrench when the pusher 62 is screwed into the mounting hole 60. The number of the second pusher 62 may be two or more, in short to be able to push pushing the product portion W ₁ from the top, it may be provided at least one.

As shown in FIG. 1, a support body 32 is provided below the product portion W ₁ of the die cast product W held by the clamp mechanism 30. The support 32 can be moved in the vertical direction (the direction indicated by the arrow E in FIG. 1) and the horizontal direction (the direction indicated by the arrow F) by the support driving mechanism 80. Support drive mechanism 80 is controlled by the controller 33, the support 32 and the support 32 is advanced is positioned directly below the product portion W ₁ by the support member driving mechanism 80, and the support substrate 32 is retracted 32 is adapted to retreat from under the product portion W ₁ laterally. Below the support body 32, a dam housing box 90 and a product housing box 91 having an upper surface opened are disposed. When viewed from above, the opening area of the weir storage box 90 is larger than the opening area of the product storage box 91.

The support 32 includes a tray 32a and a shape variable member 32b accommodated in the tray 32a. The deformable member 32b has an upper surface 32c in contact with the product portion W ₁ of the die casting product W, the upper surface 32c is made of a material that can be deformed to follow the lower surface contour of the product portion W _1. That is, in a state where the product portion W ₁ is placed on the shape variable member 32b, at least a part of the upper surface 32c of the shape variable member 32b is deformed according to the contour of the lower surface of the product portion W ₁ . A peelable cover may be provided on the upper surface 32c of the shape-variable member 32b so that the shape-variable member 32b does not adhere to the die cast product W.

The deformable member 32b, the thermoplastic material which causes plastic deformation in accordance with the contour of the product portion W ₁ under the temperature range of residual heat after casting the die-cast article W (e.g. 100 to 200 ° C.), for example, thermoplastic Elastomer (TPE) may be used. Or aggregate of a large number of particles which can be moved in a shape to follow the contours of the product portion W _1, may be one covering for example a collection or upper surface of the sand of a large number of glass beads with deformable cover. Further, a heat-resistant mat may be laid on the upper surface of an aggregate of particles such as ball gravel, or a heat-resistant cover may be laid on the upper surface of a jelly-like resin (for example, a gel mat) that is fluid at room temperature. Moreover, a fluid mat formed by sealing a fluid such as compressed air or liquid in a heat-resistant airtight bag or a fluid material having viscosity or viscoelasticity may be used. Any on the upper surface 32c of the shape variable member 32b and is not necessary to deform the perfectly matched shape to the contour of the product portion W _1, by deforming into a shape along at least a portion of the contour of the product portion W ₁ It is sufficient that the uneven product portion W ₁ can be supported by the surface.

Next, the operation (dam fold processing) of the dam folding device 20 having the above configuration will be described with reference to the flowchart shown in FIG. 6 and the process explanatory diagrams shown in FIGS.
The die cast product W cast by the die casting machine 1 is carried into the dam folding device 20 in the operation S1 of FIG. The die-cast molded article W, in operation S2, as shown in FIG. 7, biscuit section W ₅ is held by the clamp mechanism 30. The held die-cast product W is in a posture of being tilted sideways so that the parting line X is substantially horizontal. Therefore, the upper surface of the product portion W ₁ of the upper surface and the overflow portion W ₂ becomes substantially the same height.

In operation S3 in FIG. 6, as shown in FIG. 8, the support 32 is advanced to a position below the product portion W ₁ of the die-cast article W. As further shown in FIG. 9, by the support body 32 rises, the product portion W ₁ is supported by the support member 32. In this state, at least a portion of the upper surface 32c of the deformable member 32b has a shape corresponding to the lower surface of the product portion W _1. Then, the elevating unit 31 moves to a position above the die cast product W. Elevating unit 31 this time is in the initial position _{H 0.} Therefore, the lower end of the first pusher 61 is separated opposed to the upper surface of the overflow section W _2, and the lower end of the second pusher 62 is separated opposed to the upper surface of the product portion W _1.

In operation S4 in FIG. 6, as shown in FIG. 10, the lifting unit 31 is lowered from the initial position _{H 0} to the first height _{H 1.} Then, the lower end of the first pusher 61 abuts against the overflow part W _2, further lowered from that position. At this time the product portion W ₁ is supported, moreover the upper surface 32c of the deformable member 32b has a shape having irregularities according to the lower surface of the contour of the product portion W ₁ by the support member 32. Thus when the first pusher 61 to push the overflow section W _2, the product section W ₁ includes the deformed upper surface 32c of the deformable member 32b, it will be supported in terms. Thus with respect to supported product portion W _1, by only the overflow section W ₂ is forcibly pushed down by the first pusher 61, broken weir portion W ₄ of the overflow side, overflow part W ₂ Falls into the weir housing box 90.

In operation S5 in FIG. 6, as shown in FIG. 11, the support 32 is retracted from below the product portion W ₁ to the retracted position of the side. The upper surface 32c of the retracted support 32, recess 32d remains accordingly to the contour of the support to have the product portion W _1. For this reason, if the shape of the die-cast molded product W processed in the subsequent dam folding cycle is the same as that of the previous die-cast molded product W, the product of the next die-cast molded product W in the already formed recess 32d it is possible to insert a part W _1.

In operation S6 in FIG. 6, as shown in FIG. 12, the lifting unit 31 is lowered from the first height H ₁ to a second height H _2. Then, the lower end of the second pusher 62 abuts against the product unit W _1, further lowered from that position. By only the product portion W ₁ is forcibly pushed down by the second pusher 62 with respect to the time the sprue-side solidified portion W ₃ is because it is supported by the clamp mechanism 30, the sprue-side solidified portion W _3, sprue The dam portion W ₇ on the side is broken, and the product portion W ₁ falls into the product storage box 91.

In operation S7 of FIG. 6, the elevating unit 31 is raised. In addition operation S8, the clamp mechanism 30 is moved to a predetermined biscuits recovery unit, by releasing (unclamping) the biscuit portion W _5, the sprue-side solidified portion W ₃ including the biscuit portion W ₅ collected in the biscuit collection unit Is done. And in operation S9, the product portion W ₁ contained in the product accommodating box 91, for example by being conveyed to a predetermined position by the transfer means such as a robot arm, one cycle of the weir folding processing ends.

The weir folding device 20 described above is configured so that the lifting unit 31 including the first pusher 61 and the second pusher 62 is moved from the initial position H ₀ to the first height H ₁ and the second height by the lifting mechanism 50. is only sequentially lowered into and H _2, it is possible to efficiently break the dam portion W ₇ of the overflow side of the weir W ₄ and sprue side. Therefore it is possible to efficiently remove the overflow part W ₂ and sprue-side solidified portion W ₃ from the product portion W _1.

According to the weir folding apparatus 20 of the present embodiment, when the first of the pusher 61 is lowered overflow side weir portion W ₄ is broken, along the outer shape of the product portion W ₁ of die-cast molded product W deformation products section _{W 1} is supported by the upper surface 32c of the deformable member 32b you are. When Accordingly dam portion W ₄ is broken, the product section W ₁ will be also supported against the force acting in the lateral direction and the like as well as vertically.

For this reason overflow section W ₂ when pressed from above by the first pusher 61, an overflow section W _2, as shown in FIG. 1 occurs moment M as bends downward move shift the die casting product W in a horizontal direction, etc. since even at work as a force, is suppressed lateral movement of the product portion W ₁ is the upper surface 32c of the three-dimensional shape having irregularities, if the top surface 32c of the shape varying member 32b as moved to follow the movement, product portion W ₁ can avoid the occurrence of scratches due to rubbing against the upper surface 32c of the support 32. Moreover, since the product portion W ₁ is supported by a surface (upper surface 32c) by the deformable member 32b, it can be avoided stress is concentrated on a specific location. Upper surface 32c of the deformable member 32b, since it corresponds to the contour of the product portion W ₁ of various shapes, or to fine-tune the position of the deformable member 32b in accordance with the product portion W _1, necessary to change the program Therefore, preparation for the weir folding work can be performed in a short time.

In this embodiment as described above, the first pusher 61, mixture was allowed to break the dam portion W ₄ of the overflow side and is made to break the dam portion W ₇ of the sprue-side by the second pusher 62, 1 by the lifting unit with only type of pusher may be caused to break only the dam portion W ₄ of the overflow side.

  Further, in carrying out the present invention, including the specific shape and configuration of the die-cast molded product and the die-casting machine, the lifting unit, the lifting mechanism, the support, and the number and shape of the pushers constituting the weir folding device, etc. Needless to say, specific aspects of various elements constituting the invention can be modified as necessary.

W ... Die-cast molded product, W ₁ ... Product part, W ₂ ... Overflow part, W ₃ ... Pouring side solidification part, W ₄ ... Overflow side weir part, W ₅ ... Biscuit part, 20 ... Weir folding device, 30 ... Clamp Mechanism: 31 ... Elevating unit, 32 ... Support, 32b ... Shape variable member, 32c ... Upper surface, 50 ... Elevating mechanism, 61 ... Pusher.

Claims (5)

A clamp mechanism for holding the inflow side solidified portion of the cast die-cast product,
An elevating unit disposed above the die-cast molded product held by the clamp mechanism and having a pusher protruding toward the overflow portion of the die-cast molded product;
An elevating mechanism for moving the elevating unit in the vertical direction, and lowering the elevating unit against the die-cast molded product held by the clamp mechanism to bring the lower end of the pusher into contact with the overflow portion, and An elevating mechanism that pushes the overflow part downward by a pusher and breaks the weir part on the overflow side;
A variable shape which is a support that supports the product part from below in a state where the elevating unit is lowered and the pusher is in contact with the upper surface of the product part of the die cast product, and deforms according to the contour of the product part A support body that has a member, the upper surface of the shape-variable member is deformed into a shape corresponding to the lower surface of the product portion, and supports the product portion;
A dam-folding device for a die-cast molded product.   The weir folding device according to claim 1, wherein the variable shape member is made of a fluid resin that can move to a shape corresponding to a contour of the product portion.   The weir folding device according to claim 1, wherein the shape variable member includes an aggregate of a large number of particles that can move to a shape corresponding to the contour of the product portion.   2. The weir folding device according to claim 1, wherein the shape-variable member is made of a thermoplastic material that causes plastic deformation in a shape corresponding to a contour of the product portion in a temperature range of residual heat of casting of the die cast product. .   The weir folding device according to claim 1, wherein the shape variable member is made of a material having viscoelasticity that can move to a shape corresponding to an outline of the product portion.

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