JP2014100713A - Die casting mold and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die casting mold capable of easily replacing core pins and a die casting method performing die casting using the same.SOLUTION: A die casting mold includes a core pin 50 comprising an external member 51 made of steel and an internal member 52 made of copper or a copper alloy. A screw hole 61 for connecting the core pin 50 by screwing is formed on a molding surface for defining a cavity of the die casting mold, and an inner surface of the screw hole 61 consists of an external member 62 made of steel and an internal member 63 made of copper or a copper alloy. The internal member 52 of the core pin 50 and the internal member 63 of the screw hole 61 come into contact with each other when the core pin 50 is screwed into the screw hole 61.

Description

  The present invention relates to a die-casting die and a die-casting method, and more particularly to a die-casting die provided with a core pin and a die-casting method for performing die-casting using this die-casting die.

  When a product is cast by a casting method such as a die casting method, a die pin may be disposed on the mold. About this cast pin, since it becomes high temperature with the heat | fever of the molten metal with which it fills in the cavity of a metal mold | die, the molded product may be baked or distorted and it may become a defective product. Therefore, as described in Patent Document 1 below, it is known to cool a core pin by disposing a cooling pipe composed of an inner pipe and an outer pipe inside the core pin (core pin). Yes. However, the cast pin as in Patent Document 1 requires time and labor for processing the hole in which the cooling pipe is disposed.

  On the other hand, among the conventional cast pins, a configuration in which the cooling pipe of the cast pin described in Patent Document 1 does not exist is known. For example, Patent Document 2 below discloses a cast pin in which an internal member made of a metal having high thermal conductivity and an external member made of a heat-resistant iron-based material and surrounding the internal member are integrated. Yes. According to Patent Document 2, a material having high thermal conductivity such as a copper alloy is used for the internal member, and the external member that is in direct contact with the molten metal is indirectly cooled through the internal member. Thus, it is said that the cooling effect can be suitably obtained without using a cooling medium, and the thermal shock received from the molten metal can be mitigated to improve the durability of the core pin.

JP 2000-141010 A Japanese Patent Laid-Open No. 1-306062

  However, the cast pin according to Patent Document 2 listed above is formed with a flange shape for preventing the tail end portion of the external member from being removed. Replacement of the punch pin cannot be performed in the mold open state, and there is a problem that work efficiency is poor. That is, in this type of technical field, provision of a technique that can easily replace the cast pin has been demanded.

  The present invention has been made in view of the problems existing in the above-described prior art, and the object thereof is a casting made of an outer member made of steel and an inner member made of copper or a copper alloy. The purpose of the present invention is to realize a die-casting die that can easily replace the core pin and a die-casting method that performs die-casting using the die-casting die.

  The present invention will be described below. In addition, in order to make an understanding of this invention easy, the reference number of an accompanying drawing is attached in parenthesis writing, However, This invention is not limited to the form of illustration by it.

  The die casting mold according to the present invention is a die casting mold having a cast pin (50) composed of an outer member (51) made of steel and an inner member (52) made of copper or a copper alloy. A screw hole (61) for screwing and joining the core pin (50) is formed on the molding surface that defines the cavity of the die casting mold, and the inner surface of the screw hole (61) is The outer member (62) made of steel and the inner member (63) made of copper or a copper alloy, and when the core pin (50) is screwed into the screw hole (61), The inner member (52) of the core pin (50) and the inner member (63) of the screw hole (61) are configured to contact each other.

  In the die casting mold according to the present invention, the internal member (52) constituting the core pin (50) is configured to have a crushing allowance (52a) with respect to the screw hole (61). When the core pin (50) is screwed, it is preferable that the crushing allowance (52a) is screwed and joined in a crushed state.

  The die casting method according to the present invention is characterized in that die casting is performed using the above-described die casting mold.

  ADVANTAGE OF THE INVENTION According to this invention, about the die-casting pin comprised by the external member which consists of steel, and the internal member which consists of copper or a copper alloy, the die-casting die which can implement | achieve the replacement | exchange of the die-casting pin easily, and its die-casting It is possible to provide a die casting method in which die casting is performed using a metal mold.

It is sectional drawing which shows the example of the whole structure of the casting equipment provided with the metal mold | die for common die-casting, and has shown the state before filling with a molten metal especially. It is sectional drawing which shows the example of the whole structure of the casting equipment provided with the metal mold | die for general die-casting, and has shown the state after filling with a molten metal especially. It is a figure which shows the state before a core pin is attached with respect to a nest | insert. It is a figure which shows the state after a core pin was attached with respect to the nest | insert.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. .

  Before describing the die casting mold according to the present embodiment and the die casting method using the die casting mold, first, based on FIGS. 1 and 2, a general die casting mold according to the present embodiment is used. The overall configuration of the casting facility will be described. Here, FIG.1 and FIG.2 is sectional drawing which shows the example of whole structure of the casting equipment provided with the metal mold | die 1 for general die-casting, Especially FIG. 1 has shown the state before filling of a molten metal, FIG. 2 shows a state after the molten metal is filled. As shown in FIGS. 1 and 2, the die casting mold 1 is provided as a main constituent member of a casting facility for performing die casting.

  The illustrated general die casting mold 1 includes a fixed mold 10 including a fixed die 12 and a fixed holder 11, and a movable mold 20 including a movable die 22 and a movable holder 21. A cavity 1 a is defined by the fixed die 12 and the movable die 22. The die casting mold 1 is provided with a sleeve 30. The sleeve 30 communicates with the cavity 1a through the biscuit 1b, the runner 1c, and the gate 1d. A plunger tip 31 is provided in the sleeve 30. The plunger tip 31 can advance and retreat in the sleeve 30. Further, a diverter 40 is provided at the position of the biscuit 1b, which is the position facing the forward direction of the plunger tip 31. When the plunger tip 31 advances in the sleeve 30 and presses the molten metal 2, the molten metal 2 is filled into the cavity 1 a via the biscuit 1 b, the runner 1 c, and the gate 1 d. In addition, by advancing the plunger tip 31 from the state shown in FIG. 1 to the state shown in FIG. 2, the molten metal 2 pressed by the plunger tip 31 and sent through the sleeve 30 is converted into a diverter. Collide with 40. And the molten metal 2 which collided with the flow divider 40 is comprised so that it may be guide | induced to the runner 1c and the gate 1d by the flow divider 40. FIG.

  Next, a configuration around the core pin included in the die casting mold according to the present embodiment will be described in detail with reference to FIGS. 3 and 4. In the present embodiment, the case where the cast pin 50 is provided with respect to the insert 60 accommodated and fixed in the fixed die 12 or the movable die 22 in order to define the cavity 1a will be described as an example. To do. Here, FIG. 3 is a diagram showing a state before the core pin 50 is attached to the insert 60, and FIG. 4 is a diagram showing a state after the core pin is attached to the insert 60. is there.

  As shown in FIG. 3, the core pin 50 according to the present embodiment includes an external member 51 made of steel having high heat resistance such as SKD and an internal member 52 made of oxygen-free copper having a high heat transfer coefficient. ing. About this cast pin 50, the thread groove 51a is formed in the attachment location to the insert 60 mentioned later. Further, the end portion on the side where the screw groove 51a is formed is formed so that the oxygen-free copper as the internal member 52 protrudes beyond the external member 51 surrounding the oxygen-free copper. The protruding portion is a portion formed as a crushing allowance 52a, and is a portion provided to realize a strong coupled state by being crushed when attached to the insert 60.

  On the other hand, a screw hole 61 for screwing and joining the above-described core pin 50 is formed in the insert 60 according to the present embodiment. In particular, the screw hole 61 is provided on the molding surface for defining the cavity 1 a in the die casting mold 1. Furthermore, about the inner surface of the screw hole 61 which the nest | insert 60 which concerns on this embodiment has, while the outer side (namely, molding surface side) is comprised by the external member 62 which consists of high heat-resistant steels, such as SKD, That is, the bottom surface side of the screw hole 61 is constituted by an internal member 63 made of oxygen-free copper having a high heat transfer coefficient.

  By screwing the portion of the screw groove 51a of the core pin 50 into the screw hole 61 of the insert 60 described above, the screw-joining of the core pin 50 to the insert 60 is realized as shown in FIG. When the screw groove 51a of the core pin 50 is screwed into the screw hole 61, the internal member 52 of the core pin 50 and the internal member 63 of the screw hole 61 come into contact with each other. Here, the inner member 63 of the screw hole 61 constituting the insert 60 is formed with a cooling hole 64 for coming into contact with an external cooling medium, so that the molten metal transmitted from the surface of the core pin 50 is transmitted. This heat is transferred from the internal member 52 made of oxygen-free copper constituting the core pin 50 to the internal member 63 made of oxygen-free copper constituting the screw hole 61 of the insert 60 and further introduced into the cooling hole 64. Therefore, the cooling of the core pin 50 can be realized.

  Further, as described above, the end portion on the screw groove 51a side formed in the core pin 50 has the crushing allowance because the oxygen-free copper as the internal member 52 protrudes beyond the external member 51 surrounding the oxygen-free copper. As shown in FIG. 4, when the core pin 50 is screwed into the screw hole 61 of the insert 60, the crushing allowance 52 a is crushed in the axial direction of the core pin 50. Then, there is no gap between the crushing allowance 52a and the internal member 63, and a good heat transfer is realized, and the cast pin 50 and the insert 60 are firmly fixed by an action such as work hardening by the crushed crushing allowance 52a. A simple combined state will be realized.

  Further, since the cast pin 50 in the installed state shown in FIG. 4 is only screwed and joined to the screw hole 61 of the insert 60, when the cast pin 50 is to be removed, the cast pin 50 is rotated. By doing so, it can be easily removed from the screw hole 61 of the insert 60. That is, by adopting the core pin 50 according to the present embodiment and the configuration for attaching the core pin 50, it is possible to realize a die casting die that can easily replace the core pin.

  Incidentally, in the related art represented by the above-mentioned Patent Document 2, etc., it is necessary to provide piping and passages for cooling, and as a cooling target, a small member such as a cast pin is effectively used. There was a reality that cooling was not possible. However, as for the configuration around the core pin 50 provided in the die casting mold according to the present embodiment, the cooling hole 64 may be provided in a member such as the insert 60 where the core pin 50 is installed. The core pin 50 which is a small member is also configured to be effectively cooled.

  It should be noted that a known dissimilar material joining technique such as diffusion bonding is adopted for the joining of dissimilar materials such as SKD or the like constituting the cored pin 50 or the insert 60 according to the present embodiment and copper or copper alloy such as oxygen-free copper. In this way, it is possible to bond without separation without gaps.

  As mentioned above, although preferred embodiment of this invention was described, the technical scope of this invention is not limited to the range as described in the said embodiment. Various modifications or improvements can be added to the embodiment.

  For example, in the above-described embodiment, the case where the core pin 50 is installed with respect to the insert 60 has been described as an example. However, the core pin of the present invention defines the cavity 1 a such as the fixed die 12 and the movable die 22. It can be installed on any member having a molding surface for forming.

  In the above-described embodiment, the external member 51 constituting the core pin 50 and the external member 62 constituting the insert 60 are configured by SKD, and the internal member 52 and the insert 60 constituting the core pin 50 are configured. The case where the internal member 63 is made of oxygen-free copper has been described as an example. However, the steel constituting the outer members 51 and 62 and the copper or copper alloy constituting the inner members 52 and 63 are not limited to those described above, and may be constituted by a metal material that exhibits the same effect. Is possible.

  It is apparent from the description of the scope of claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

  1 die for general die casting, 1a cavity, 1b biscuit, 1c runner, 1d gate, 2 molten metal, 10 fixed mold, 11 fixed holder, 12 fixed die, 20 movable mold, 21 movable holder, 22 movable die, 30 sleeve , 31 Plunger tip, 40 current divider, 50 cast pin, 51 external member, 51a thread groove, 52 internal member, 52a crushing allowance, 60 nesting, 61 screw hole, 62 external member, 63 internal member, 64 cooling hole.

Claims (3)

A die casting die having a cast pin composed of an outer member made of steel and an inner member made of copper or a copper alloy,
On the molding surface that defines the cavity of the die casting mold, a screw hole for screwing and joining the core pin is formed,
The inner surface of the screw hole is composed of an outer member made of steel and an inner member made of copper or a copper alloy,
A die-casting die configured to contact an inner member of the core pin and an internal member of the screw hole when the core pin is screwed into the screw hole. The die casting mold according to claim 1, wherein
The internal member constituting the core pin has a crushing allowance,
A die-casting die, wherein when the core pin is screwed into the screw hole, the die-casting die is screwed and joined in a state where the crushing allowance is crushed.   A die casting method, wherein die casting is performed using the die casting die according to claim 1.

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