JP7105661B2 - die casting mold - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die-casting mold, and more particularly to a die-casting mold having an insert fitted in a die.

Die casting molds for casting aluminum alloys and magnesium alloys are known. A die casting mold is mainly composed of a fixed mold and a movable mold, and each of the fixed mold and the movable mold has a holder and a die housed and fixed in the holder. A fixed die and a movable die define a cavity. Each die may be fitted with a separate part called an insert.

The mold release agent and water sometimes enter the gap between the insert and the die, and the infiltrated mold release agent and water flow into the cavity, which is depressurized during casting, causing defects in the cast product. . Therefore, a mechanism is provided to discharge the mold release agent and water entering the gap to the outside of the mold so that they do not flow into the cavity. Patent Document 1 discloses a die casting apparatus (die casting mold) having such a mechanism. Specifically, a chamber in the die is provided between the rear edge of the insert and the inner peripheral surface of the die, and the chamber in the die is connected to the evacuation means so that the release agent and water flow into the cavity. to prevent However, there is room for improvement from the viewpoint of reliable removal of the release agent and water.

JP 2006-68814 A

SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and it is an object of the present invention to provide a die casting mold that can reliably prevent mold release agent and water from entering the cavity and obtain a die casting product of good quality. With the goal.

In order to achieve the above object, the present invention provides a fixed mold comprising a fixed holder and a fixed die, a movable mold comprising a movable holder and a movable die, a cavity defined by the fixed die and the movable die, and a fixed die. Alternatively, in a die casting mold having an insert installed on at least one of said movable dies, a mechanism for removing moisture etc. is provided on the cavity side of half of the total length of the portion of said insert that is in close contact with said die. is characterized by

Further, the moisture removing mechanism is characterized by having a groove provided in the insert or the die.

ADVANTAGE OF THE INVENTION According to this invention, the die-cast metal mold|die which can obtain a die-cast product with good quality by reliably preventing a release agent and water from entering into a cavity can be provided.

1 is a cross-sectional view showing a main part of a die casting mold according to the present invention; FIG. FIG. 4 is a cross-sectional view showing the essential parts of a second embodiment of the die casting mold according to the present invention; FIG. 10 is a cross-sectional view showing the essential parts of a third embodiment of the die casting mold according to the present invention; FIG. 11 is a cross-sectional view showing the essential parts of a fourth embodiment of the die casting mold according to the present invention;

A die casting mold according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG.

FIG. 1 is a cross-sectional view showing a main part of a die casting mold according to the present invention. This mold is mainly composed of a fixed mold and a movable mold (not shown). The fixed die comprises a fixed holder (not shown) and a fixed die housed and fixed in this fixed holder. The movable mold consists of a movable holder and a movable die 1 which is housed and fixed in the movable holder. A cavity C is defined by the movable die 1 and the fixed die. The movable die is configured to be vertically movable in FIG. In other words, the fixed die is positioned at the upper side in FIG. A cylindrical injection sleeve (not shown) is fixed to the fixed die, and molten metal is poured into this injection sleeve, and a plunger (not shown) advances to push the molten metal into the cavity at high pressure, resulting in aluminum die casting. you can get the product.

An insert 10 is fitted and fixed to the movable die 1, and a part of the insert 10 faces the inside of the cavity C to form a part of the shape of the product. The portion of the insert 10 embedded in the movable die 1 is divided into a fitting portion 10a and a non-fitting portion 10b. The fitting portion 10a has a large diameter, and the non-fitting portion 10b has a smaller diameter than the fitting portion 10a. In this embodiment, the fitting portion 10a is the close contact portion of the present invention.

An annular groove 1a is formed in the surface of the movable die 1 facing the fitting portion 10a. A part of the annular groove 1a communicates with the exhaust groove 1b, and the exhaust groove 1b is connected to a pump (not shown). A moisture removing mechanism is formed by the fitting portion 10a, the annular groove 1a, the exhaust groove 1b, the pump, and the like. The annular groove 1a and the exhaust groove 1b constitute the groove portion of the present invention. The position of the annular groove 1a is positioned closer to the cavity C than half (2/L) of the total length (L) of the contact portion (fitting portion 10a) in the vertical direction (mold opening direction) in FIG. . When the mold is opened in casting, the pump is operated to suck and remove moisture and the like through the annular groove 1a and the exhaust groove 1b. With such a configuration, it is possible to reliably prevent release agent, water, and the like from flowing into the cavity C while securely fitting and fixing the implant 10 to the die.

FIG. 2 shows a second embodiment of the invention. Note that description of the same configuration as in FIG. 1 will be omitted. An annular groove 10c is provided in the insert 10, and the annular groove 10c communicates with the exhaust groove 1b. Others are the same as the above embodiment.

FIG. 3 shows a third embodiment of the invention. The movable die 1 has an exhaust groove 1c, and the insert 10 has an exhaust groove 10d extending vertically in FIG. The annular groove 10c of the insert 10 communicates with the exhaust grooves 1c and 10d. In this embodiment, the pump is provided on the back side of the mold.

FIG. 4 shows a fourth embodiment of the invention. The insert 10 is provided so as to cover the surface of the movable die 1 facing the cavity C. As shown in FIG. An annular groove 1d is provided on the surface of the movable die 1 facing the cavity. An annular groove 10e is provided in the insert 10 so as to face the annular groove 1d. An exhaust groove 1e communicating with both annular grooves extends in the vertical direction of the movable die 1. As shown in FIG. In this embodiment as well, the moisture removal mechanism is provided on the cavity C side of the half of the full length of the portion of the insert 10 in close contact with the movable die 1 . That is, the total length of the fitting portion l1 of the insert 10 with the movable die 1 and the contact portion l2 of the insert 10 with the surface of the movable die 1 is defined as the contact portion L. As shown in FIG. It should be noted that the annular groove may be provided only on either the insert 10 or the movable die 1 .

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the gist of the present invention. For example, in the above-described embodiment, the moisture removal mechanism is operated when the mold is opened, but the mechanism is not limited to this, and may be operated after the mold is closed and before molten metal is poured. Further, it is also possible to discharge moisture and the like to the cavity C side by releasing air when the mold is opened without using the suction method.

INDUSTRIAL APPLICABILITY The die-casting mold according to the present invention is extremely useful in die-casting molds in which inserts are provided in the die.

1: Movable die 1a: Annular groove 1b: Exhaust groove 1c: Exhaust groove 1d: Annular groove 1e: Exhaust groove 10: Insert 10a: Fitting portion 10b: Non-fitting portion 10c: Annular groove 10d: Exhaust groove 10e: Annular groove

Claims (2)

a fixed die comprising a fixed holder and a fixed die; a movable die comprising a movable holder and a movable die; a cavity defined by the fixed die and the movable die; In a die casting mold having an insert, the insert is provided so as to cover the surface of the die facing the cavity, and a portion of the insert that fits into the die and a surface of the die of the insert A die-casting metal characterized in that the total length of the contact portion with the die is defined as a contact portion, and a moisture removal mechanism is provided on the cavity side of one-half of the total length of the contact portion of the insert to the die. type. 2. A die casting mold according to claim 1, wherein said moisture removing mechanism has a groove provided in said insert or said die.

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