JP2013240818A - Die-casting mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die-casting mold capable of preventing a flexure from being generated in butted core pins during forming.SOLUTION: A die-casting mold 100 includes a first mold 10 with a first core pin 11 and a second mold 20 with a second core pin 21 and is configured to butt the first core pin 11 to the second core pin 21 in forming. The first core pin 11 is formed longer than the second core pin 21. A butting part 50 between the first core pin 11 and the second core pin 21 is configured so that the first core pin 11 supports the second core pin 21 relative to a direction of a hydrodynamic force of a molten metal acting on the first core pin 11 and the second core pin 21 during teeming.

Description

  The present invention relates to a die-casting die pin butting structure.

  The die casting mold is a mold used in die casting. Die casting is a casting method in which molten metal is pressed into a die casting mold. The cast pin is a rod-shaped member provided in a mold, and is used when a hole is formed in a die cast product formed by die casting.

  For example, when forming a hole penetrating a die-cast product, molding is performed by abutting a core pin provided in one mold and a core pin provided in the other mold. However, in such a die-casting die that abuts the core pins, the abutted core pins may be bent by the fluid force of the molten metal during pouring. If molding is performed in a state where the butted core pins are bent, the positions of the holes penetrating the die-cast casting are shifted and molded.

  For example, Patent Document 1 discloses a die-casting die that abuts cast pins, and causes one cast pin to enter the other cast pin so that the matched cast pins do not bend during pouring. Disclosed is a die casting mold. However, in the die-casting die disclosed in Patent Document 1, in the case of a die-casting product with a small diameter of the cast hole, the dimensional accuracy of the product shape is deteriorated.

JP 2003-033845 A

  The problem to be solved by the present invention is to provide a die-casting die that can prevent bending between butted core pins at the time of molding without deteriorating the dimensional accuracy of the product shape.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in Claim 1, it is provided with the 1st metal mold | die provided with the 1st casting pin, the 2nd metal mold | die provided with the 2nd casting pin, and the molten metal inflow port. A die casting mold in which the second core pin is abutted and molten metal is poured from the molten metal inlet, wherein the first core pin is configured to be longer than the second core pin, and The abutting portion between the one core pin and the second core pin has the first core pin in a direction in which the fluid force of the molten metal is applied to the first core pin and the second core pin during pouring. The second cast pin is configured to be supported.

  According to a second aspect of the present invention, in the die casting mold according to the first aspect, an inclined surface facing the fluid force of the molten metal is formed at a butt portion of the first cored pin with the second cored pin. An inclined surface facing the inclined surface of the first core pin is formed at a butt portion of the second core pin with the first core pin, and the first core pin and the second core pin are formed. The abutting portion with the pin is a portion where the inclined surface of the first core pin and the inclined surface of the second core pin are in contact with each other during pouring.

  According to a third aspect of the present invention, in the die-casting die according to the second aspect, the first cast pin has an inclined surface on the molten metal inlet side.

  According to a fourth aspect of the present invention, in the die-casting die according to the second or third aspect, the first core pin is directed from the inclined surface of the first core pin toward the second core pin side. And the second core pin has a concave portion that is recessed from the inclined surface of the second core pin toward the base end side of the second core pin. The butt portion between the first core pin and the second core pin is engaged with the convex portion of the first core pin and the concave portion of the second core pin during pouring. It is.

  According to the die-casting die of the present invention, it is possible to prevent bending of the butted core pins at the time of molding without deteriorating the dimensional accuracy of the product shape.

The schematic diagram which showed the whole structure of the die-casting metal mold | die. The schematic diagram which similarly showed the effect | action of the die-casting metal mold | die at the time of pouring.

The configuration of the die casting mold 100 will be described with reference to FIG.
In FIG. 1, the overall configuration of the die casting mold 100 is schematically shown. Moreover, the butting | matching part 50 of the 1st casting pin 11 and the 2nd casting pin 21 is represented below the FIG. In the butting portion 50 in FIG. 1, the first core pin 11 and the second core pin 21 are shown separated from each other for easy understanding. Below, it demonstrates according to the left-right direction and the up-down direction which are shown by FIG.

  The die casting mold 100 is an embodiment of a die casting mold according to the present invention. The die casting mold 100 is a mold used in die casting. Die casting is a casting method in which molten metal (aluminum in this embodiment) is pressed into a die casting mold 100. A cast product by the die casting mold 100 of the present embodiment is a cylinder block (hereinafter, workpiece W (not shown)) of an automobile engine.

  The die casting mold 100 includes a first mold 10, a second mold 20, molds 30 and 40, and other two molds (not shown). Six molds including the first mold 10 and the second mold 20 are arranged in six directions around the workpiece W, and are configured to be slidable so as to be close to or separated from the workpiece W in each direction. .

  The six molds including the first mold 10 and the second mold 20 form a cavity (shape space of the workpiece W) in a state of being closest to each other (in a state where the six molds are closed). The 1st metal mold | die 10 and the 2nd metal mold | die 20 are arrange | positioned so that it may mutually oppose in the left-right direction of the workpiece | work W. FIG. The dies 30 and 40 are arranged so as to face each other in the vertical direction of the workpiece W.

  The 1st metal mold | die 10 is a metal mold | die arrange | positioned at the one side of the left-right direction. The first mold 10 includes a first core pin 11, a slide insert 12, a spring 13, and a insert folder 15.

  The first core pin 11 is formed in a bar shape and protrudes from the nested folder 15 toward the second mold 20 side (inner side) in the left-right direction. The first core pin 11 is supported by the nested folder 15 via a spring 13. The first core pin 11 is abutted with a second core pin 21 described later at the time of molding, and a hole (main gallery) penetrating in the left-right direction of the workpiece W (cylinder block) is formed.

  The slide insert 12 is supported by the insert folder 15. A shape of the workpiece W is formed on the surface (inner surface) of the slide insert 12 facing the second mold 20.

  The insert folder 15 supports the first core pin 11 via the slide insert 12 and the spring 13. The nested folder 15 is supported by a hydraulic cylinder (not shown) so as to slide freely in the left-right direction.

  The 2nd metal mold | die 20 is a metal mold | die arrange | positioned at the other side of the left-right direction. The second mold 20 includes a second core pin 21, a slide insert 22, a spring 23, and a insert folder 25.

  The second punching pin 21 is formed in a bar shape and protrudes from the nested folder 25 toward the first mold 10 side (inner side) in the left-right direction. The second core pin 21 is supported by the nested folder 25 via a spring 23. Here, as a matter of special mention, the length of the first core pin 11 in the left-right direction is sufficiently shorter than the length of the second core pin 21 in the left-right direction.

  Since the slide insert 22, the spring 23, and the insert folder 25 in the second mold 20 are the same as the slide insert 12, the spring 13, and the insert folder 15 in the first mold 10, the description thereof is omitted.

  The butting portion 50 is a portion where the tip side of the first core pin 11 and the tip side of the second core pin 21 are abutted during pouring. The abutting portion 50 of the first core pin 11 includes an inclined surface 16 and a convex portion 17. The abutting portion 50 of the second core pin 21 includes an inclined surface 26 and a concave portion 27.

  The inclined surface 16 and the inclined surface 26 support the second core pin 21 with respect to the direction in which the first core pin 11 and the second core pin 21 bend during pouring. Configured to do.

  In the die casting mold 100 of the present embodiment, a molten metal inlet 35 (a place where aluminum is poured) is formed below, and the molten metal flows from below to above in the vertical direction during pouring. Therefore, the fluid force of the molten metal acts on the first core pin 11 and the second core pin 21 upward in the vertical direction.

  Since the fluid force of the molten metal acts upward on the first core pin 11 and the second core pin 21 in the vertical direction, the first core pin 11 and the second core pin 21 are directed upward in the vertical direction. It will bend.

  As described above, the inclined surface 16 and the inclined surface 26 are formed so that the first core pin 11 is in the second casting direction with respect to the direction in which the first core pin 11 and the second core pin 21 are bent during pouring. The punch pin 21 is configured to be supported. That is, the inclined surface 16 is formed to be inclined so as to face obliquely downward, and is an inclined surface that faces upward fluid force caused by the molten metal. The inclined surface 26 is formed so as to be inclined obliquely upward, and is an inclined surface facing the inclined surface 16.

  Thus, the inclined surface 16 which opposes the fluid force of a molten metal is formed in the butt | matching part 50 with the 2nd core pin 21 of the 1st core pin 11, and the 1st core pin of the 2nd core pin 21 is carried out. An abutting surface 26 facing the inclined surface 16 of the first cast pin 11 is formed at the abutting portion 50 with the pin 11.

  The convex portion 17 is formed at a substantially central portion of the inclined surface 16 of the first core pin 11. The convex portion 17 is formed to project from the inclined surface 16 of the first core pin 11 toward the second core pin 21 side in the left-right direction. The cross-sectional shape in the up-down direction of the convex part 17 is formed in the rectangle.

  The concave portion 27 is formed at a substantially central portion of the inclined surface 26 of the second core pin 21. The concave portion 27 is formed to be recessed from the inclined surface 26 of the second core pin 21 toward the base end portion side (the slide insert 22 side) of the second core pin 21 in the left-right direction. The cross-sectional shape in the vertical direction of the recess 27 is formed in a rectangular shape.

  In a state where the first core pin 11 and the second core pin 21 are abutted with each other, the convex portion 17 of the first core pin 11 is fitted into the concave portion 27 of the second core pin 21, so that the first core The punch pin 11 and the second core pin 21 are fitted in a state where the portions other than the left-right direction are fixed.

The operation of the die casting mold 100 will be described with reference to FIG.
FIG. 2 schematically shows the die casting mold 100 in a state where the first core pin 11 and the second core pin 21 are in contact with each other during pouring. Further, in order to make the explanation easy to understand, the description of the molds 30 and 40 is omitted.

  In the die casting mold 100, the first core pin 11 and the second core pin 21 are abutted against each other during pouring. At this time, as described above, the fluid force of the molten metal acts upward in the vertical direction on the first core pin 11 and the second core pin 21 (black arrow in FIG. 2).

  Since the fluid force of the molten metal acts upward on the first core pin 11 and the second core pin 21 in the vertical direction, the first core pin 11 and the second core pin 21 are directed upward in the vertical direction. It will bend.

  Here, since the length in the left-right direction of the first core pin 11 is sufficiently shorter than the length in the left-right direction of the second core pin 21, the rigidity of the first core pin 11 is the second Compared to the rigidity of the core pin 21, it is sufficiently large. Therefore, the first core pin 11 is more difficult to bend than the second core pin 21.

  In the present embodiment, the inclined surface 16 of the first core pin 11 is formed so as to be inclined obliquely downward, and the inclined surface 26 of the second core pin 21 is formed to be inclined obliquely upward. ing. Therefore, the first core pin 11 that is not easily bent supports the second core pin 21 with respect to the direction in which the fluid force of the molten metal is applied to the first core pin 11 and the second core pin 21 during pouring. The first core pin 11 and the second core pin 21 are brought into contact with each other.

  In other words, the force applied to the second core pin 21 by the upward fluid force is received by the inclined surface 16 of the first core pin 11 via the inclined surface 26.

The effect of the die casting mold 100 will be described.
According to the die-casting die 100, it is possible to prevent bending of the first core pin 11 and the second core pin 21 that are abutted at the time of molding.

  Conventionally, in a die-casting die that abuts core pins, the abutted core pins may be bent by the fluid force of the molten metal during pouring. If molding is performed in a state where the butted core pins are bent, there is a possibility that the position of the hole penetrating the workpiece is shifted and molding is performed.

  In the die-casting die 100 of the present embodiment, the first core pin 11 and the second core pin 21 are abutted so that the first core pin 11 that is difficult to bend supports the second core pin 21. Therefore, it becomes difficult to bend in the state where the first core pin 11 and the second core pin 21 are abutted. And the bending of the 1st casting pin 11 and the 2nd casting pin 21 can be prevented with respect to the fluid force of the molten metal which acts upwards in the up-down direction at the time of pouring.

  Since the bending of the first core pin 11 and the second core pin 21 can be prevented against the fluid force of the molten metal acting upward in the vertical direction during pouring, the first core pin 11 abutted at the time of molding. And the bending of the 2nd casting pin 21 can be prevented.

  Moreover, in the die-casting die 100 of this embodiment, in the state where the first core pin 11 and the second core pin 21 are abutted, the convex portion 17 of the first core pin 11 is the second core pin 21. Is fitted into the recess 27. Therefore, the shift | offset | difference in the state with which the 1st casting pin 11 and the 2nd casting pin 21 were faced | matched can be suppressed.

  Further, in the die casting mold 100 of the present embodiment, the first core pin 11 is supported by the nested folder 15 via the spring 13, and the second core pin 21 is supported by the nested folder 25 via the spring 23. Has been. Therefore, it is possible to absorb the seat bending in the left-right direction due to the thermal expansion of the first core pin 11 and the second core pin 21 during molding.

  In the butt portion 50 of the present embodiment, the inclined surface 16 of the first core pin 11 is formed so as to be inclined downward, and the inclined surface 26 of the second core pin 21 is inclined so as to face obliquely upward. However, the present invention is not limited to this.

  For example, in a die casting mold in which a molten metal inlet 35 is formed at the upper side and the fluid force of the molten metal during pouring acts downward in the vertical direction, the inclined surface 16 of the first core pin 11 faces diagonally upward. It is formed so as to be inclined, and at the same time, the inclined surface 26 of the second core pin 21 is formed so as to be inclined obliquely downward.

DESCRIPTION OF SYMBOLS 10 Mold 11 1st casting pin 16 Inclined surface 17 Convex part 20 Mold 21 2nd Casting pin 26 Inclined surface 27 Convex part 100 Die-casting die

Claims (4)

A first mold having a first core pin, a second mold having a second core pin, and a molten metal inlet, and the first core pin and the second core pin protrude during molding. A die casting mold in which molten metal is poured from the molten metal inlet,
The first core pin is configured to be longer than the second core pin,
The abutting portion between the first core pin and the second core pin is the first core core with respect to the direction in which the fluid force of the molten metal is applied to the first core pin and the second core pin during pouring. A pin is configured to support the second core pin;
Die casting mold. A die casting mold according to claim 1, wherein
In the butt portion of the first core pin with the second core pin, an inclined surface facing the fluid force of the molten metal is formed,
In the abutting portion of the second core pin with the first core pin, an inclined surface facing the inclined surface of the first core pin is formed,
The abutting portion between the first core pin and the second core pin is in contact with the inclined surface of the first core pin and the inclined surface of the second core pin during pouring,
Die casting mold. The die-casting die according to claim 2, wherein the first core pin has an inclined surface on the molten metal inlet side.
Die casting mold. A die-casting die according to claim 2 or claim 3,
The first cast pin is provided with a convex portion projecting from the inclined surface of the first cast pin toward the second cast pin side,
The second core pin is provided with a recess that is recessed from the inclined surface of the second core pin toward the base end side of the second core pin,
The butt portion of the first core pin and the second core pin is engaged with the convex portion of the first core pin and the concave portion of the second core pin during pouring,
Die casting mold.

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