JP2019089075A - Die casting device - Google Patents

Abstract

To provide a die casting device capable of effectively suppressing deformation of a core pin caused by thermal expansion.SOLUTION: This die casting device forms a through-hole in a cast by butting the other end of a first core pin supported at one end on a first mold and the other end of a second core pin supported at one end on a second mold to each other, and is configured such that at least one of the first and second core pins is a spring support core pin supported by a mold via a spring member so as to be able to retreat in a direction away from a molding cavity, an insertion hole for inserting the spring support core pin is formed in the mold that supports the spring support core pin, the insertion hole has a tapered part reduced in diameter toward the opening of the molding cavity, and the spring support core pin is provided with an abutment part that has a tapered shape corresponding to the tapered part at the position of abutment against the tapered part in a state where the other end of the first core pin and the other end of the second core pin are butted to each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a die casting apparatus.

  Among die casting machines, one is known which uses a casting pin to form a through hole in a casting. In such a die-casting apparatus, in Patent Document 1, the through-hole is formed by butting together a casting pin provided in one mold and a casting pin provided in the other mold. The configuration is disclosed.

JP, 2013-240818, A

  When a molten metal is injected into a molding cavity formed by a mold in a state where the mold extraction pin provided in one mold and the mold extraction pin provided in the other mold are butted, The pin thermally expands and axially expands. In order to prevent the casting pin from being deformed due to the axial extension of the casting pin, for example, the casting pin can be retracted in a direction away from the molding cavity (axial direction of the casting pin) It is conceivable to support the mold through a spring member.

  By the way, when the molten metal is pressed into the molding cavity, not only the core pin but also the mold thermally expands. However, when the mold thermally expands, the diameter of the insertion hole formed in the mold shrinks, so that the slide of the casting pin inside the insertion hole is prevented, and the casting pin can not be retracted well in the axial direction. There was a case that I did.

  This invention is made in view of the above background, and an object of this invention is to provide the die-cast-casting apparatus which can suppress a deformation | transformation of the casting pin by thermal expansion effectively.

  According to the present invention, there is provided a molding comprising: a first mold for supporting one end of a first pouring pin; and a second mold disposed opposite to the first mold and for supporting one end of a second casting pin. It is possible to form a through hole in a casting by providing a plurality of molds for forming a cavity, and by abutting the other end of the first mold pin and the other end of the second mold pin to each other Die-casting apparatus, wherein at least one of the first casting pin and the second casting pin is supported by a metal mold supported via a spring member so as to be retractable in a direction away from the molding cavity An insertion hole for inserting the spring-supporting casting pin is formed in a die for supporting the spring-supporting casting pin, and the insertion hole is formed in an opening on the side of the molding cavity. With a tapered portion that is tapered towards The spring-supporting die-cutting pin has a taper corresponding to the tapered portion at a position where the other end of the first die-cutting pin and the other end of the second die-casting pin abut on the tapered portion. An abutment portion having a shape is provided.

  When the molten metal is pressed into the molding cavity and the mold thermally expands and the diameter of the insertion hole formed in the mold shrinks, the tapered portion of the insertion hole presses the abutting portion of the casting pin. The tapered portion of the insertion hole is reduced in diameter toward the opening on the side of the molding cavity, so when the contact portion of the casting pin is pressed by the tapered portion of the insertion hole, the molding cavity Force is exerted in the direction away from the Thereby, since the core pin recedes in the direction away from the molding cavity, it is possible to effectively suppress the deformation of the core pin due to thermal expansion.

  According to the present invention, deformation of the core pin due to thermal expansion can be effectively suppressed.

It is a schematic diagram which shows schematic structure of the die-cast casting apparatus concerning this Embodiment. It is the schematic diagram which expanded the area | region enclosed with the broken line A in FIG. It is the schematic diagram to which the area | region enclosed with the broken line B in FIG. 1 was expanded. It is the schematic diagram which expanded the area | region enclosed with the broken line C in FIG. About the action of the contact portion formed on the spring-supporting cast-out pin when molten metal is pressed into the molding cavity, and the tapered part of the insertion hole of the mold for supporting the spring-supported cast-out pin by the spring member It is a schematic diagram explaining. About the action of the contact portion formed on the spring-supporting cast-out pin when molten metal is pressed into the molding cavity, and the tapered part of the insertion hole of the mold for supporting the spring-supported cast-out pin by the spring member It is a schematic diagram explaining.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description and drawings are omitted and simplified as appropriate for clarification of the explanation. In the drawings, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted as necessary. The following description will be made in accordance with the left-right direction and the up-down direction shown in FIG.

  First, a schematic configuration of a die casting apparatus according to the present embodiment will be described with reference to FIG. The die casting apparatus according to the present embodiment is for manufacturing a cast by die casting in which molten metal (for example, aluminum) is pressed. The casting is, for example, a cylinder block of an automobile engine.

  FIG. 1 is a schematic view showing a schematic configuration of a die casting apparatus 100 according to the present embodiment. In addition, the state which the 1st casting pin 11 and the 2nd casting pin 21 spaced apart is shown in FIG. As shown in FIG. 1, the die casting apparatus 100 includes a first mold 10, a second mold 20, an upper mold 30, a lower mold 40, and two other molds (not shown). A plurality of molds (a total of six in the present embodiment) are provided.

  Six molds including the first mold 10 and the second mold 20 are arranged in six directions around the circumference of the casting and configured to be slidable so as to approach or separate from the casting in each direction. . Specifically, the first mold 10 and the second mold 20 are arranged to face each other in the left-right direction of the cast. The upper mold 30 and the lower mold 40 are disposed to face each other in the vertical direction of the casting. Furthermore, two other molds (not shown) are disposed to face each other on the back side and the front side of the paper surface.

  The six molds including the first mold 10 and the second mold 20 form mold cavities in the closest state to each other, ie, the six molds are closed. Molten metal is poured into the forming cavity to form a casting. The molding shape of the casting is formed on the surface (surface on the molding cavity side) facing the casting in each mold.

  Each mold is driven by a drive such as a hydraulic cylinder so as to be able to form a mold cavity and demold the casting. For example, the first mold 10 and the second mold 20 are configured to slide freely in the lateral direction by the drive device, and the upper mold 30 and the lower die 40 are freely movable in the vertical direction by the drive device. It is configured to slide.

  In the first mold 10, an insertion hole 12 for inserting the first core pin 11 is formed. The first pouring pin 11 is formed in a rod shape, and is configured to project from the first mold 10 toward the molding cavity in the left-right direction. The first casting pin 11 is a spring-supporting casting pin supported at one end by the first mold 10 via a spring member 13 so as to be able to retract in a direction away from the molding cavity.

  The second mold 20 is formed with an insertion hole 22 for inserting the second core pin 21. The second pouring pin 21 is formed in a bar shape, and is configured to project from the second mold 20 toward the molding cavity in the left-right direction. The second casting pin 21 is a spring-supporting casting pin, one end of which is supported by the second mold 20 via a spring member 23 so as to be able to retract in a direction away from the molding cavity.

  FIG. 2 is a schematic view enlarging a region surrounded by a broken line A in FIG. As shown in FIG. 2, a region surrounded by a broken line A is a portion where the other end of the first core pin 11 and the other end of the second core pin 21 are butted in pouring. An end face 11 a and a protrusion 11 b are formed at the other end of the first core pin 11. Further, an end face 21 a and a recess 21 b are formed at the other end of the second core pin 21. In the state where the other end of the first core pin 11 and the other end of the second core pin 21 are butted, the convex part 11 b and the concave part 21 b are fitted. By abutting the other end of the first core pin 11 and the other end of the second core pin 21, a through hole can be formed in the casting.

  FIG. 3 is an enlarged schematic view of a region surrounded by a broken line B in FIG. As shown in FIG. 3, the insertion hole 12 in the first mold 10 is a tapered portion reduced in diameter toward the opening on the molding cavity side near the root of the protruding portion of the first core pin 11. It has 12a. Further, at a position where the first casting pin 11 abuts on the tapered portion 12 a of the insertion hole 12 in a state where the other end of the first casting pin 11 and the other end of the second casting pin 21 are butted. An abutting portion 11c having a tapered shape corresponding to the tapered portion 12a is provided.

  FIG. 4 is a schematic view enlarging a region surrounded by a broken line C in FIG. As shown in FIG. 4, the configuration of the insertion hole 22 of the second mold 20 and the second die-cutting pin 21 in the area surrounded by the broken line C is the insertion of the first mold 10 in the area surrounded by the broken line B. The configuration is the same as the configuration of the hole 22 and the first core pin 11. That is, the insertion hole 22 in the second mold 20 has a tapered portion 22 a having a diameter reduced toward the opening on the molding cavity side in the vicinity of the root of the protruding portion of the second casting pin 21. Further, the second casting pin 21 is in contact with the tapered portion 22 a of the insertion hole 22 in a state where the other end of the first casting pin 11 and the other end of the second casting pin 21 are butted. An abutting portion 21c having a tapered shape corresponding to the tapered portion 22a is provided.

  FIGS. 5 and 6 show the contact portion formed on the spring-supporting die-cutting pin when molten metal is pressed into the molding cavity, and the insertion of a mold for supporting the spring-supporting die-casting pin by the spring member. It is a schematic diagram explaining the effect | action of the taper part in a hole.

  As shown in FIG. 5, when the molten metal is pressed into the molding cavity and the first mold 10 thermally expands and the diameter of the insertion hole 12 formed in the first mold 10 shrinks, the taper of the insertion hole 12 The contact portion 11c of the first core pin 11 is pressed by the force F1 by the portion 12a. Since the tapered portion 12a of the insertion hole 12 is reduced in diameter toward the opening on the molding cavity side, when the contact portion 11c of the first core pin 11 is pressed by the tapered portion 12a of the insertion hole 12, A force P1 is exerted on the first core pin 11 in a direction away from the molding cavity. As a result, the first core pin 11 is retracted in the direction away from the molding cavity.

  The same applies to FIG. 6 as in FIG. That is, as shown in FIG. 6, when the melted metal is pressed into the molding cavity and the second mold 20 thermally expands and the diameter of the insertion hole 22 formed in the second mold 20 shrinks, the insertion hole 22 is inserted. The contact portion 21c of the second core pin 21 is pressed by the force F2 by the tapered portion 22a. Since the tapered portion 22a of the insertion hole 22 is reduced in diameter toward the opening on the molding cavity side, when the contact portion 21c of the second core pin 21 is pressed by the tapered portion 22a of the insertion hole 22, A force P2 is exerted on the second core pin 21 in a direction away from the molding cavity. As a result, the second core pin 21 is retracted in the direction away from the molding cavity.

  As mentioned above, according to the die-casting apparatus 100 concerning this Embodiment, a deformation | transformation of the casting pin by thermal expansion can be suppressed effectively.

  The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the scope of the present invention. For example, in the above embodiment, a spring-supporting die-cut supported by a mold member via a spring member so as to be able to retract both the first core pin 11 and the second core pin 21 in the direction away from the molding cavity. Although it was a pin, it is not limited to this. Only one of the first and second casting pins may be a spring-supporting casting pin.

DESCRIPTION OF SYMBOLS 10 1st metal mold | die 11 1st casting pin 11a, 21a end surface 11b convex part 11c, 21c contact part 12, 22 insertion hole 12a, 22a taper part 13, 23 spring member 20 2nd metal mold 21 2nd casting pin 21b Recess 30 Upper mold 40 Lower mold 100 Die casting apparatus

Claims (1)

A mold cavity is formed, including a first mold supporting one end of a first mold pin and a second mold disposed opposite to the first mold and supporting one end of a second mold pin. Die casting apparatus capable of forming a through hole in a cast by providing a plurality of molds for forming a through hole, and allowing the other end of the first mold pin and the other end of the second mold pin to abut each other And
At least one of the first casting pin and the second casting pin is a spring-supporting casting pin supported by a mold via a spring member so as to be able to retract in a direction away from the molding cavity,
An insertion hole for inserting the spring-supporting casting pin is formed in a mold for supporting the spring-supporting casting pin, and the insertion hole is reduced in diameter toward the opening on the molding cavity side. Have a tapered portion,
The spring support casting pin is a taper corresponding to the tapered portion at a position where the other end of the first casting pin and the other end of the second casting pin abut on the tapered portion in a state where the other end is abutted. A die casting apparatus comprising an abutment portion having a shape.

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