JP2010194561A - Die-casting die and die-casting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a die-casting die which sufficiently prevents inflow of a broken chilled layer into a cavity and has good working efficiency, and also to provide a die-casting method for the same. <P>SOLUTION: The die-casting die 1 includes a fixed mold 20 having a fixed mold divided surface 20A and a movable mold 10 movably separable from/approachable to the fixed mold 20 and having a movable mold divided surface 10A. A runner 4a, a gate 3a connected with the runner 4a, and a cavity 1a connected with the gate 3a are demarcated by the fixed mold 20 and the movable mold 10. Melt is filled into the cavity 1a through the runner 4a and the gate 3a. The runner 4a and an excessive part forming part 2a are demarcated by a fixed mold projecting part 20b projected from the fixed mold divided surface 20A and a movable mold recess part 10a formed in the movable mold, and the gate is connected with the cavity 1a through the excessive part forming part 2a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a die casting mold and a die casting method.

  There is known a die casting mold in which a runner part, a gate part, and a cavity part are formed, and a molten metal is filled into the cavity part through the runner part and the gate part. A biscuit portion is formed at one end of the runner portion, and one end of the sleeve is opened to face the biscuit portion. A plunger tip is provided in the sleeve so as to be movable in the axial direction of the sleeve. By driving the plunger tip, the molten aluminum alloy or the like injected into the sleeve is filled into the cavity through the biscuits, runners, and gates.

  When the molten metal is injected into the sleeve when the die casting method is performed, a part of the molten metal is rapidly solidified by contact between the molten metal and the inner surface of the sleeve, and a so-called fracture chill layer is formed along the inner surface of the sleeve. The fractured chill layer is peeled off from the sleeve inner surface by driving the plunger tip, and the molten metal containing the fractured chill layer flows into the cavity through the gate, which is the portion connected to the cavity part of the runner part and the gate part. The ruptured chill layer is mixed in the product formed inside. The fractured chill layer forms a non-welded part by mixing in the normal part where the molten metal is normally solidified, and the presence of this non-welded part causes the product quality, durability, appearance, etc. to deteriorate. . Therefore, it is desirable that the broken chill layer stops before the gate and does not flow into the cavity.

  Japanese Patent Application Laid-Open No. 2004-337879 (Patent Document 1) describes a die casting die for preventing a broken chill layer from flowing into a cavity portion. The gate part of the die casting die has a shape narrowed toward the gate, and prevents a broken chill layer having a dimension of a certain value or more from flowing into the cavity part.

  Japanese Patent Application Laid-Open No. 2004-268099 (Patent Document 2) describes a die casting method for preventing a broken chill layer from flowing into a cavity portion using a purification filter. A filter is provided in the runner portion (runner portion) in the vicinity of the gate so as to cross the runner, the broken chill layer is captured by the filter, and the broken chill layer is prevented from flowing into the cavity portion.

JP 2004-337879 A JP 2004-268099 A

  However, in the die casting die described in Patent Document 1, the broken chill layer that has entered the gate portion and has reached the vicinity of the gate is pushed into the cavity portion by the molten metal and flows into the cavity portion. For this reason, there is a problem that inflow of the broken chill layer cannot be sufficiently prevented.

  Moreover, in the die-casting method described in Patent Document 2, a process of disposing a purification filter in the runner portion is required every time casting is performed, which causes a problem that work efficiency is deteriorated.

  Then, an object of this invention is to provide the die-casting die and die-casting method which can fully prevent inflow of the fracture | rupture chill layer to a cavity part, and whose work efficiency is good.

  The present invention includes a fixed mold 20 having a fixed mold dividing surface 20A, and a movable mold 10 which is movable so as to be separated from and approaching the fixed mold 20 and has a movable mold dividing surface 10A. The mold 20 and the movable mold 10 define a runner part 4a, a gate part 3a connected to the runner part 4a, and a cavity part 1a connected to the gate part 3a. In the die casting mold 1 in which the cavity portion 1a is filled with molten metal through the gate portion 3a, a fixed mold convex portion 20b protruding from the fixed mold dividing surface 20A and a movable mold concave portion 10a formed on the movable mold 10 are used. The gate part 3a and the surplus molding part 2a are defined, and the gate part 3a provides a die casting mold 1 connected to the cavity part 1a via the surplus molding part 2a.

  The present invention also provides a die casting method in which die casting is performed using a die casting mold 1.

  According to the die casting mold and the die casting method of the present invention, since the gate portion is connected to the cavity portion via the surplus molding portion, the broken chill layer is pushed by the molten metal and flows into the cavity portion. There are effects such as being able to be prevented.

FIG. 1 is a cross-sectional view of a main part showing a die casting mold.

  A die casting mold according to an embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the die casting mold 1 has a fixed mold 20 and a movable mold 10. The fixed mold 20 has a fixed mold dividing surface 20A that faces the movable mold 10 and can abut on a movable mold dividing surface 10A described later. The fixed mold dividing surface 20A is oriented in the vertical direction in FIG. . A fixed mold recess 20a made of a recess is formed in the fixed mold 20 at the position of the fixed mold dividing surface 20A.

  The movable mold 10 can move in a substantially horizontal direction so as to be separated from and approach the fixed mold 20, and can contact the fixed mold 20. The movable mold 10 has a movable divided surface 10A that faces the fixed mold 20 and can contact the fixed mold divided surface 20A. The movable dividing surface 10A is substantially parallel to the fixed mold dividing surface 20A and is directed in the vertical direction in FIG. The movable mold 10 is formed with a movable convex portion 10b protruding from the movable mold dividing surface 10A. When the movable mold 10 is in contact with the fixed mold 20 by the movable mold dividing surface 10A and the fixed mold dividing surface 20A coming into contact with each other, the movable convex portion 10b It is configured to define.

  A movable recessed portion 10a made of a recessed portion is formed in the movable mold 10 at the position of the movable mold dividing surface 10A. The movable mold recess 10a is formed so as to protrude from the fixed mold dividing surface 20A when the movable mold dividing surface 10A and the fixed mold dividing surface 20A are in contact with each other, so that the movable mold 10 is in contact with the fixed mold 20. It is comprised so that the surplus molding part 2a, the gate part 3a, and the runner part 4a may be defined with the fixed mold | type convex part 20b.

  The cavity part 1a, the surplus molding part 2a, the gate part 3a, and the runner part 4a are connected to each other in this order. The molten metal such as an aluminum alloy that has flowed into the runner part 4a is configured to be filled into the cavity part 1a through the gate part 3a and the surplus molding part 2a.

  The gate portion 3a has a narrowed portion 3a (A) whose sectional area is narrowed toward the surplus molding portion 2a and a plate-like portion 3a (B) whose sectional area is substantially constant. One end of the narrowed portion 3a (A) is connected to the runner portion 4a, and the other end is connected to one end of the plate-like portion 3a (B). And the gate which is the other end of plate-like part 3a (B) is connected to surplus molding part 2a, and is connected to cavity part 1a via surplus part 2a.

  Since the gate portion 3a includes the throttle portion 3a (A) and the plate-like portion 3a (B), the breakage exceeds the width of the cross-section of the plate-like portion 3a (B) flowing into the gate portion 3a from the runner portion 4a. The chill layer is prevented from flowing into the cavity 1a. Further, since the surplus molding part 2a is provided, the broken chill layer, which is prevented from flowing into the cavity part 1a by the throttle part 3a (A) and the plate-like part 3a (B), is pushed in by the molten metal. Even if it moves somewhat to the cavity part 1a side, the broken chill layer is prevented from flowing into the cavity part 1a.

  In the die-cast product, the product part is a part formed in the cavity part 1a, and the product part is separated from the part formed by the gate part 3a and the runner part 4a after the die-cast product is taken out from the die-casting die 1. Is the position of the other end (gate) of the plate-like portion 3a (B) (position indicated by G in FIG. 1). Since the gate part 3a and the runner part 4a are defined by the fixed mold convex part 20b formed to protrude from the fixed mold dividing surface 20A toward the movable mold 10 and the movable mold concave part 10a formed on the movable mold 10, The position of the other end (gate) of the plate-like portion 3a (B) is separated from the cavity portion 1a by an amount that the fixed convex portion 20 protrudes, and the other end (gate) of the plate-like portion 3a (B) and the cavity Since the surplus molding part 2a is defined between the part 1a, even if the broken chill layer is pushed in by the molten metal and moves somewhat from the gate part 3a to the cavity part 1a side, the broken chill layer It can prevent reaching to the cavity part 1a. In addition, the surplus part shape | molded in the surplus part shaping | molding part 2a is removed from a product part by a process.

  One end of a sleeve (not shown) is provided at the lower end portion in FIG. 1 of the runner portion 4a. The sleeve has a substantially cylindrical shape, and a hot water supply hole (not shown) including a through hole that communicates the inside and the outside of the sleeve is formed at a position near the other end of the sleeve, and the molten metal is introduced into the sleeve from the hot water supply hole. It can be supplied. A plunger tip (not shown) is slidable in the sleeve, and after the molten metal is supplied from the hot water supply hole into the sleeve, the plunger tip is advanced to move the molten metal in the sleeve to the runner portion 4a and the gate. The cavity part 1a can be filled through the part 3a and the surplus molding part 2a.

  In the die casting method, the molten metal is supplied from the hot water supply hole into the sleeve. Then, by sliding the plunger tip in the sleeve, the molten metal in the sleeve is poured into the gate portion 3a through the runner portion 4a. At this time, the broken chill layer generated in the sleeve also flows into the runner portion 4a together with the molten metal and tries to flow into the cavity portion 1a through the gate portion 3a. However, the throttle portion 3a (A) of the gate portion 3a and the plate The ruptured chill layer that is equal to or larger than the width of the cross section of the plate-like portion 3a (B) is prevented from flowing into the cavity portion 1a by the ridge portion 3a (B). And even if it is a case where the fracture | rupture chill layer from which the inflow to the cavity part 1a was blocked | prevented was pushed in by the molten metal, the plate-shaped part 3a (B) is connected to the cavity part 1a via the surplus molding part 2a. Therefore, the broken chill layer is prevented from reaching the cavity portion 1a. After the molten metal in the cavity 1a is solidified, the mold is opened and the die-cast product is taken out from the die-casting die 1. The above is the die casting method.

  The die-casting die and the die-casting method according to the present invention are not limited to the above-described embodiments, and various modifications and improvements can be made within the scope described in the claims. For example, the fixed mold may have a fixed die and a fixed holder, and the movable mold may have a movable die and a movable holder.

  The die-casting die and the die-casting method of the present invention are extremely useful in the field of die-casting where it is required that the broken chill layer does not enter the product part.

DESCRIPTION OF SYMBOLS 1 Die-cast metal mold | die 1a Cavity part 2a Extra thickness molding part 3a Gate part 3a (A) Restriction part 3a (B) Plate-like part 4a Runner part 10 Movable mold 10A Movable mold dividing surface 10a Movable mold recessed part 20 Fixed mold 20A Fixed mold division Surface 20a Fixed mold concave part 20b Fixed mold convex part

Claims (2)

  A fixed mold having a fixed mold dividing surface; and a movable mold having a movable mold dividing surface that is movable so as to be spaced apart from and approaching the fixed mold; and the runner includes the fixed mold and the movable mold. A die casting mold in which a portion, a gate portion connected to the runner portion, and a cavity portion connected to the gate portion are defined, and the cavity portion is filled with the molten metal through the runner portion and the gate portion The gate part and the surplus molding part are defined by the fixed mold convex part protruding from the fixed mold dividing surface and the movable mold concave part formed in the movable mold, and the gate part is formed in the cavity part. A die casting mold characterized in that it is connected via a meat molding part.   A die-casting method, wherein the die-casting method according to claim 1 is die-cast.

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