JP2009056503A - Molding metal mold and molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding metal mold which can prevent a bend and a crack caused by the shrinkage of a cast part by a simple constitution, and can surely and automatically takes out a molded product by using a robot, and a molding method. <P>SOLUTION: The molding metal mold 1 is provided with at least a fixed metal mold 10 and a movable metal mold 11 which are arranged so as to face to each other and relatively approach to and retreat from each other, and form cavities 30 of prescribed shapes by closing them, and form the cast part 31 by communicating each cavity 30 with the tip of a plunger sleeve 20. The movable metal mold 11 is provided with an extrusion mechanism 7 having extrusion pins 70, 71 for extruding the molded product P, and a shrinkage prevention-part molding part 9 for forming a shrinkage prevention part P1a is provided so as to correspond to the extrusion pin 71 at the cast part P1 of the molded product P. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a molding die and a molding method, and in particular, a molding die for molding a molded product composed of a product having a desired shape and a design part other than the product by filling a molten molding material, and The present invention relates to a method of filling a molten molding material and molding a molded product including a product having a desired shape and a plan part other than the product.

  For example, in a conventional die casting machine, generally as shown in FIGS. 7 to 9, a molding die 1 ′ which forms a cavity 30 ′ corresponding to a product P 0 ′ to be molded inside by being abutted, as shown in FIGS. And a plunger device 2 for injecting and filling a molten metal molding material into the cavity 30 'of the molding die 1'. A conventional general molding die 1 ′ includes a fixed die 10 ′ and a movable die 11 ′. If necessary, the opening and closing direction of the movable die 11 ′ with respect to the fixed die 10 ′ A slide core 12 ′ that moves in the intersecting direction is provided. The plunger device 2 includes a plunger sleeve 20 connected to the fixed mold 10 ', and a molding material that is slidably inserted into the plunger sleeve 20 and supplied into the plunger sleeve 20, and is injected into the cavity 30'. And a plunger tip 21 for the purpose. By bringing the movable mold 11 ′ into contact with the fixed mold 10 ′, a casting plan 31 ′ composed of a gate, a runner, a gate, etc. is formed between the tip of the plunger sleeve 20 and the cavity 30 ′. The formed product P ′ formed and solidified with the molding material has a product P0 ′ formed into a desired shape by the cavity 30 ′ and a design part P1 of a portion other than the product P0 ′ formed by the casting method 31 ′. 'And are molded. Further, if necessary, an overflow portion 32 ′ is provided above the cavity 30 ′ of the molding die 1 ′, and as shown in FIGS. 10 and 12, an overflow P2 ′ may be molded into the molded product P ′. is there.

  As shown in FIG. 7, when the molding material injected into the cavity 30 ′ is solidified and the molding is completed, the movable mold 11 ′ is separated from the fixed mold 10 ′ as shown in FIG. Move to and open the mold. At this time, the plunger tip 21 moves forward so as to protrude the biscuit part P3 'of the molded product P', and the molded product P 'is held by the movable mold 11'. Thereafter, as shown in FIG. 9, the extrusion pin 70 ′ is protruded to extrude the molded product P ′ from the movable mold 11 ′, and the design part P1 ′ of the molded product P ′ is grasped by a robot or the like from the mold 1 ′. It is generally performed automatically. The molding die 1 ′ is not only a so-called one-piece mold (see FIG. 6) for molding a single product P0 ′, but also a plurality of molds for molding a plurality of products P0 ′. In such a case, as shown in FIG. 10, a plan part P1 ′ is formed between a single biscuit part P3 ′ and each product P0 ′.

  By the way, in such die-cast molding, it is known that the molten molding material contracts when it solidifies in the mold (see, for example, Patent Document 1). As shown in FIG. 10, in the case of so-called two-piece die casting, the plan portion P1 ′ contracts toward the center biscuit portion P3 ′ when solidified (arrow in FIG. 10). S).

  Patent Document 1 discloses that in a die-cast molded product having a wall portion and an intersecting wall portion intersecting with the wall portion, the occurrence of a coagulation shrinkage nest without causing problems such as the occurrence of a hot water wrinkle or an oxide. (0008) is a die casting mold for forming a die cast product having a wall portion and an intersecting wall portion intersecting the wall portion, and intersects the intersecting wall portion. An elongated gate portion extending along the end surface portion of the wall portion is provided, and the gate portion is provided with a huge portion bulging from a part of the gate portion toward the intersecting wall portion. A feature die casting mold is disclosed.

JP 2004-337879 A

  When the design part P1 ′ is solidified as indicated by an arrow S in FIG. 10 after the mold is opened as shown in FIG. 8 until the molded product P ′ is taken out as shown in FIG. By contracting toward the central biscuit part P3 ′, the plan part P1 ′ is lifted from the casting plan 31 ′ of the molding die 1 ′ as shown in FIG. 11, and as a result, the product P0 ′ and the plan part P1 ′. May be bent, or may be broken as shown by the chain line in FIG. In such a case, there is a problem that the design part P1 'of the molded product P' cannot be automatically taken out from the molding die 1 'by grasping it by the robot.

  The present invention has been made in view of the above-described problems, and has a simple configuration, prevents bending and cracking due to contraction of the plan portion, and thus enables a molded product to be automatically and reliably taken out by a robot. An object is to provide a mold and a molding method.

In order to achieve the above-mentioned object, the invention according to claim 1 forms a molded product comprising a product having a desired shape and a design part other than the product by filling a molten molding material. The molding die has a shrinkage prevention part molding portion for forming a shrinkage prevention part in the design part of the molded product.
Further, in order to achieve the above object, the invention according to claim 2 fills a molten molding material and molds a molded product including a product having a desired shape and a design part other than the product. It is a method, Comprising: A shrinkage | contraction prevention part is formed in a plan part, It is characterized by the above-mentioned.

According to the first aspect of the present invention, since the shrinkage-preventing portion is formed in the design portion of the molded product by the shrinkage-preventing portion molding portion, the design portion of the molded product shrinks due to solidification between the time when the mold is opened and taken out Therefore, it is possible to provide a molding die that can prevent the plan part from being bent or cracked, and can reliably take out the molded product automatically by the robot.
Further, according to the invention according to claim 2, by forming the shrinkage prevention portion in the design portion, it is possible to prevent the design portion of the molded product from shrinking due to solidification during the period from when the mold is opened until it is taken out. Therefore, it is possible to provide a molding method capable of preventing the plan portion from being bent or cracked and reliably taking out the molded product automatically by the robot.

(Aspect of the Invention)
In the following, the invention that is claimed to be claimable in the present application (hereinafter referred to as “claimable invention”. The claimable invention is at least the “present invention” to the invention described in the claims. Some aspects of the present invention, including subordinate concept inventions of the present invention, superordinate concepts of the present invention, or inventions of different concepts) will be illustrated and described. As with the claims, each aspect is divided into sections, each section is numbered, and is described in a form that cites the numbers of other sections as necessary. This is for the purpose of facilitating the understanding of the claimable invention, and is not intended to limit the combinations of the constituent elements constituting the claimable invention to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiments, etc., and as long as the interpretation is followed, another aspect is added to the form of each section. Moreover, the aspect which deleted the component from the aspect of each term can also be one aspect of the claimable invention. In each of the following items, item (1) corresponds to claim 1 and item (5) corresponds to claim 2.

(1) A molding die for molding a molded product composed of a product having a desired shape and a design part other than the product by filling a molten molding material,
A molding die having a shrinkage-preventing part molding portion for forming a shrinkage-preventing part in a design part of the molded product.

  In the invention described in (1), since the shrinkage prevention portion is formed in the design portion of the molded product by the shrinkage prevention portion molding portion, the design portion of the molded product shrinks due to solidification after the mold is opened and taken out. Therefore, it is possible to prevent the plan part from being bent or cracked, and to reliably take out the molded product automatically by the robot.

  (2) The molding die according to (1), wherein the shrinkage prevention portion molding portion is a recess that forms a convex shrinkage prevention portion in the design portion.

  In the invention described in the item (2), in the invention described in the item (1), by forming the shrinkage prevention portion molding portion in a portion corresponding to the design portion of the molded product, a convex shape is formed in the design portion of the molded product. Therefore, it is possible to reliably prevent the design part of the molded product from shrinking due to solidification during the period from when the mold is opened to when the mold is taken out.

  (3) The mold according to (2), wherein the shrinkage prevention portion molding portion is an annular recess formed around the extrusion pin.

  In the invention described in the item (3), in the invention described in the item (2), the shrinkage-preventing portion of the design portion of the molded product is extruded by forming a ring-shaped anti-shrinkage-forming portion around the extrusion pin. Since it is molded so as to be hugged at the tip of the pin, it can be surely prevented that the design part of the molded product shrinks due to coagulation from the time the mold is opened until it is taken out. Thus, the molded product can be reliably released.

  (4) The molding die according to (3), wherein an inner side surface of the shrinkage prevention portion molding portion including the annular recess is constituted by a bush into which an extrusion pin is inserted.

  In the invention described in the item (4), in the invention described in the item (3), a bush is externally fitted at least near the tip of the extrusion pin, and an annular shrinkage prevention portion molding portion is provided around the bush. As a result, the inner peripheral surface of the shrinkage-preventing portion is molded so as to be held by the bush, so that it is possible to reliably prevent the design portion of the molded product from shrinking due to solidification during the period from when the mold is opened until it is taken out. In addition, it is possible to reliably remove the molded product including the anti-shrinkage part from the tip of the push-out pin after reliably releasing the molded product.

(5) A method of filling a molten molding material and molding a molded product composed of a product having a desired shape and a plan part other than the product,
A molding method characterized by forming a shrinkage-preventing portion in the design portion.

  In the invention described in the item (5), by forming the shrinkage prevention portion in the design portion, it is possible to prevent the plan portion of the molded product from shrinking due to solidification before the mold is opened and taken out. Therefore, it is possible to provide a molding method capable of preventing the plan part from being bent or cracked and reliably taking out the molded product automatically by the robot.

First, an embodiment of the molding die of the present invention will be described based on FIGS. 1 to 4 in the case of a so-called two-piece die casting molding die. The same reference numerals indicate similar or corresponding parts.
The molding die 1 of the present invention is generally arranged so as to be relatively close to and away from each other, and by closing the mold, a cavity 30 of a predetermined shape, the tip of the plunger sleeve 20, and each cavity 30 includes at least a fixed mold 10 and a movable mold 11 forming a casting plan 31 communicating with each other, and the movable mold 11 includes an extrusion mechanism 7 provided with extrusion pins 70 and 71 for extruding the molded product P. Further, a shrinkage prevention part molding portion 9 for forming the shrinkage prevention part P1a in the design part P1 of the molded product P is provided in correspondence with the extrusion pin 71.

  The stationary mold 10 is attached to the stationary platen 4 of the die casting machine, and is arranged so that the tip of the plunger sleeve 20 of the plunger device 2 penetrates the surface facing the movable mold 11 to form the same surface. ing. A plunger tip 21 is slidably inserted into the plunger sleeve 20. A locate pin 80 is provided on the surface of the fixed mold 10 facing the movable mold 11.

  The movable mold 11 is attached to the movable platen 5 of the die casting machine. The movable platen 5 is connected to a mold clamping device for opening and closing the movable mold 11 with respect to the fixed mold 10 and clamping the mold with a predetermined pressure during molding. A hole carrying a bush 81 is formed at a position of the movable mold 11 facing the fixed mold 10 and corresponding to the locate pin 80. Extrusion pins 70 and 71 of the extrusion mechanism 7 are provided at predetermined positions between the cavity 30 of the movable mold 11 and the casting method 31 (the extrusion pins 71 corresponding to the casting method 31 will be described later). The base ends of 70 and 71 are connected to the extrusion plate 72. The front end surfaces of the push-out pins 70 and 71 are arranged so as to form the same plane as the cavity 30 and the casting plan 31 when in the retracted state.

  In this embodiment, a slide core 12 is provided that moves in a direction intersecting the opening / closing direction of the movable mold 11 relative to the fixed mold 10. The slide core 12 is slidably disposed above the surface of the movable mold 11 facing the fixed mold 10 and is supported by an actuator 6 including a cylinder. Further, an overflow portion 32 is formed above each cavity 30.

  As shown in FIG. 5, a plurality of extrusion pins 71 are arranged in the casting plan 31 communicating with each cavity 30 corresponding to the shrinkage prevention portion P1a formed in the plan portion P1 of the molded product P. And as shown in FIG. 4, the recessed part 90 is each formed in the edge part by the side of the casting plan 31 of the hole in which the extrusion pin 71 is penetrated. Further, on the casting plan 31 side of the hole through which the extrusion pin 71 is inserted, a bush 75 protrudes into the recess 90 and is in the retracted state, as shown in FIG. 4 (a). The tip surfaces of each other are arranged so as to form the same plane. Therefore, in this embodiment, the annular shrinkage prevention portion molding portion 9 is constituted by the outer peripheral surface of the bush 75 and the inner peripheral surface and bottom surface of the recess 90. A draft angle is formed on the outer peripheral surface of the bush 75 and the inner peripheral surface of the recess 90 (which can also be referred to as the inner peripheral side surface and the outer peripheral side surface of the shrinkage prevention portion molding portion 9).

Next, the molding method according to the present invention will be described in detail along with the operation of the molding die 1 configured as described above.
In the molding method of the present invention, the molded product P is roughly filled with the melted molding material to form a molded product P composed of a product P0 having a desired shape and a design part P1 other than the product P0. The shrinkage prevention part P1a that engages with the mold 11 is formed in the part P1.

  As described above, the annular shrinkage prevention portion molding portion 9 is formed around the tip of the push pin 71 located in the casting method 31 of the movable mold 11. When molding the molded product P using such a molding die 1, first, the movable die 11 is brought into contact with the fixed die 10 by a clamping device and clamped at a predetermined pressure. At this time, the slide core 12 is disposed at a predetermined position on the surface facing the fixed mold 10 of the movable mold 11 by driving the actuator 6 composed of a cylinder or the like. It is fixed by mold clamping. Further, the extrusion plate 72 to which the base ends of the extrusion pins 70 and 71 are connected is in the retracted position, and therefore the distal end surfaces of the extrusion pins 70 and 71 disposed at predetermined positions of the casting plan 31 and the cavity 30 are , Respectively, which are flush with the surfaces of the cavity 30 and the casting plan 31.

  In this state, as shown in FIG. 1, the plunger tip 21 of the plunger device 2 is moved forward to inject and fill molten metal, which is a molding material supplied into the plunger sleeve 20, into each cavity 30 from the casting plan 31. And overflow to the overflow part 32. When the molten metal is solidified, in the embodiment shown in FIG. 5, an integrated molded product P in which the design part P1, the product P0, and the plurality of overflows P2 are respectively connected in a pair via the biscuit part P3 is formed. The Rukoto. Then, as shown in an enlarged cross-sectional view in FIG. 4A, a method for forming the molded product P by the shrinkage prevention portion molding portion 9 formed in an annular shape around the bush 75 of the push pin 71 of the movable mold 11 is used. The portion P1 is formed so that the shrinkage prevention portion P1a is hugged to the bush 75. Therefore, when the design part P1a of the molded product P is solidified, it is prevented that it tends to shrink toward the biscuit part P3 (see arrow S in FIG. 10).

  When the molten metal is solidified to form the molded product P, as shown in FIG. 2, the plunger tip 21 is advanced from the tip of the plunger sleeve 20 and is moved forward by driving the mold clamping device of the die casting machine. The mold 11 is opened so as to be separated from the fixed mold 10. At this time, the molded product P is released from the fixed mold 10 and stuck to the movable mold 11. The design part P1 of the molded product P is formed so that the shrinkage prevention part P1a is stuck to the bush 75 of the push-out pin 71, and therefore does not float by the mold opening (see FIG. 11). And the design portion P1 are not bent or cracked (see the chain line in FIG. 12), so that the design portion P1 of the molded product P is securely grasped by the robot and automatically taken out from the molding die 1. be able to.

  Thereafter, the slide core 12 is lifted and retracted by the actuator 6, and the push-out pin 70 is advanced by moving the push-out plate 72 of the push-out mechanism 7 leftward in FIG. 3 while the design part P 1 of the molded product P is gripped by a robot or the like. , 71 is ejected, and the molded product P is released from the movable mold 11 and taken out.

  At this time, as shown in FIG. 4A, the shrinkage preventing portion P1a of the design portion P1 of the molded product P is formed so as to be held by the bush 75, so that the push pin 71 in the bush 75 is protruded. 4 (b), the shrinkage prevention portion P1a of the design portion P1 of the molded product P is pulled away from the bush 75, and the shrinkage prevention portion P1a is separated from the push pin 71. Can be easily and reliably removed without bending or breaking.

  In the above-described embodiment, the case of a die casting mold has been described. However, the present invention is not limited to this embodiment, and a molding material made of other molten metal such as gravity casting is used as a cavity. The present invention can also be applied to the case where the molding material is molded in the cavity 30 or a molding material made of a molten resin is molded in the cavity 30.

It is sectional drawing which shows one Embodiment of the die-casting metal mold | die of the state which clamped the mold of this invention. It is sectional drawing which shows the state which opened the mold from the state of FIG. It is sectional drawing which shows the state which protruded the molded article from the state of FIG. FIG. 5 is a partial cross-sectional view of each part shown to explain a state in which a shrinkage prevention part and a protruding pin are protruded from a design part of a molded product formed by the shrinkage prevention part molding part of the present invention. It is a front view of the molded product in the case of taking two molded according to the present invention. It is a front view of the molded product in the case of single-piece | molding shape | molded by this invention. It is sectional drawing which shows one Embodiment of the conventional die-casting metal mold | die of the state clamped. FIG. 8 is a cross-sectional view showing a state where the mold is opened from the state of FIG. 7. It is sectional drawing which shows the state which protruded the molded article from the state of FIG. It is the front view shown in order to demonstrate the shrinkage | contraction at the time of solidification of the design part of the molded product shape | molded by the conventional shaping die. It is the partial expanded sectional view shown in order to demonstrate the state which the plan part shape | molded by the prior art floated by the shrinkage | contraction at the time of solidification. It is sectional drawing shown in order to demonstrate the state where the plan part of the molded product shape | molded by the prior art floats by shrinkage | contraction at the time of solidification, and between a product and a plan part is bent.

Explanation of symbols

P: Molded product, P0: Product, P1: Plan part, P1a: Shrinkage prevention part, 1: Molding die, 2: Plunger device, 7: Extrusion mechanism, 9: Shrinkage prevention part molding part 10: Fixed mold, 11 : Movable mold, 71: Extrusion pin, 75: Bush

Claims (2)

A molding die for molding a molded product comprising a product having a desired shape and a design part other than the product by filling a molten molding material,
A molding die having a shrinkage-preventing part molding portion for forming a shrinkage-preventing part in a design part of the molded product. A method of filling a molten molding material and molding a molded product composed of a product having a desired shape and a design part other than the product,
A molding method characterized by forming a shrinkage-preventing portion in the design portion.

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