JPS6277170A - Metallic mold for die casting - Google Patents

Abstract

PURPOSE:To improve productivity by forming a groove for air venting to a parting plane except a cavity for a product and connecting a vacuum device to the groove, thereby preventing the intrusion of the outdoor air from the parting plane into the cavity while discharging the gas, etc. in the cavity after mold closing. CONSTITUTION:The air in the groove 5 for air venting is discharged by a vacuum device connected to the groove 5 approximately at the same instant as the closing of metallic molds 1; at the same time, the gas and air in the cavity 3 for molding the product and the outdoor air intruding into the cavity from the parting plane 2 are discharged to the outside of the molds 1 through the groove 5. The gas and air in the cavity 3 are discharged from an air vent 4 if necessary and a molten metal is injected in this state into the cavity 3 to mold a product.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a mold for die casting, and more particularly to a mold suitable for carrying out vacuum die casting.

<Conventional technology> In the vacuum die-casting method, gas and air in the cavity must be actively exhausted from the air vent 1- of the closed small mold, but the precision of the parting surface of the mold must be considerably high. However, the mold is thermally deformed or cracked, and outside air inevitably enters the cavity from the parting surface of the mold during vacuuming, which requires a fairly large vacuum device and equipment. This method has the drawbacks of high costs and poor productivity.

<Problems to be Solved by the Invention> The present invention has been made in view of these conventional drawbacks, and is capable of preventing outside air from entering the cavity from the parting surface after the mold is closed, and is inexpensive. It is an object of the present invention to provide a die casting mold that can improve productivity with low equipment costs. <Means for Solving the Problems> The die casting mold of the present invention, which achieves the above object quickly, has an air vent groove formed on the parting surface other than the cavity for molding the product, and a vacuum device installed in the air vent groove. It is characterized by the fact that it connects.

<Example> Hereinafter, an example of implementing the present invention will be described based on the drawings.

A cavity 3 for molding a product is formed in a vertiginous surface 2 of the mold 1, and an air vent 4 is formed for discharging gas or air in the cavity 3 to the outside of the mold 1. A well-known vacuum device (not shown) is connected to the air vent 1-4 to actively exhaust gas and air within the cavity 3.

Furthermore, an air vent groove 5 is formed in the parting surface 2 of the mold 1 in a portion other than the cavity 3, preferably so as to surround the cavity 3. Air handling groove 5
This is to prevent outside air from entering the cavity 3 from the parting surface 2 after the mold is closed, and a parting surface 2 other than the cavity 3 of the mold 1 is provided with a depth similar to that of the air vent 4. It is formed so as to surround the cavity 3. Then, an exhaust port 6 is attached to a suitable location of the air vent groove 5 so as to communicate with the exhaust port 6, and a vacuum device (not shown) is connected to the exhaust port 6.

Then, almost at the same time as the mold 1 is closed, the vacuum device connected to the air handling groove 5 is operated to discharge the air in the air bleed groove 5, and at the same time, the parting surface 2 of the mold 1 is The outside air entering the mold is discharged to the outside of the mold through the air handling groove 5, and the air vent 1
The air and gas in the cavity 3 are discharged from 4 to 4, and the molten metal is injected into the cavity by an injection device to mold the product.

<Effects of the Invention> Since the die casting mold of the present invention is constructed in this way, even if the mold is thermally deformed or has burrs, and there is some gap between it and the paring surface, the mold will not close. While exhausting the gas and air in the main 11 bit from the air vent,
Outside air that attempts to enter the cavity from the vertiginous surface is discharged to the outside of the mold through the air vent groove, eliminating the risk of it entering the cavity.

Therefore, the gas and air inside the cavity can be quickly discharged from the mold through the air vent, and as a result, the vacuum device connected to the air vent can also be small, reducing equipment costs. , productivity can be improved.

Therefore, the intended purpose can be achieved.

[Brief explanation of drawings]

The drawings show an example of the implementation of the present invention, and the first figure is a front view and the second figure is a front view.
The figure is a sectional view taken along the line (2)-(2). In the figure, 1 is a mold, 2 is a parting surface, 3 is a cavity, and 5 is an air handling groove. Patent applicant Fuso Light Alloy Co., Ltd.'! ig
1 Figure 2 Figure 1 Procedure 111 Official Book February 12, 1986 2 Name of the invention Die-casting mold Name (Name> (525) Fuso Light Alloy Co., Ltd. Hayakawa Building Telephone Tokyo 946-0531 (Representative) ) 6. Full text of the specification to be amended 7. Contents of the amendment Amendment M Document 1. Name of the invention Die casting mold 2. Claims Air cutting groove on the parting surface other than the cavity for molding the product 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a die-casting mold, and further comprises: The details are particularly related to molds suitable for carrying out the vacuum die-casting method. <Prior art> In the vacuum die-casting method, the mold is After closing, an air vent formed on the parting surface of the mold releases the gas and air inside the cavity.Actually,
Even if the accuracy of the parting surface of the mold is considerably high, the mold will be thermally deformed or burred, and outside air will inevitably enter the cavity from the parting surface of the mold during vacuuming. Therefore, a large-sized vacuum device is required, which has the drawbacks of high equipment costs and poor productivity. Further, when the gas or air inside the cavity is discharged from the air vent 1-, there is a problem that the air vent is easily clogged with molten metal. <Problems to be Solved by the Invention> The present invention has been made in light of these conventional drawbacks. After the mold is closed, the gas and air inside the cavity are discharged, and the outside air is introduced into the cavity from the parting surface. It is an object of the present invention to provide a die-casting mold that can prevent the infiltration of metal particles and improve productivity with low equipment costs. <Means for solving the problem> The die casting mold of the present invention that achieves the above object has an air handling groove formed on the parting surface other than the cavity for molding the product, and a groove for air handling/J1 m for air removal. Flight F+
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'dLtsu'6 V' a u IJ' 1. ．． The feature is that a vacuum device is connected to one groove. <Example> Hereinafter, an example of implementing the present invention will be described based on the drawings. The mold 1 has a cavity 3 on its vertiginous surface 2 for molding the product, and an air vent 4 for discharging gas and air inside the cavity 3 to the outside of the mold 1. An air handling groove 5 is formed to prevent outside air from entering the cavity 3 while discharging gas and air. A well-known vacuum device (not shown) is connected to the air vent 4 to actively exhaust gas and air within the cavity 3. The normally formed air vent 4 may not necessarily be provided due to the presence of an air vent groove 5, which will be described later, and therefore a vacuum device connected to the air vent 1-4 is also unnecessary. That is, the air handling groove 5 is for preventing outside air from entering the cavity 3 from the parting surface 2 while discharging gas and air inside the cavity 3 after the mold is closed. On the parting surface 2 other than cavity 3,
The cavity 3 is preferably at the same depth as the air vent 4.
It is formed so as to surround the. and,
An exhaust port 6 is attached to a suitable location of the air vent groove 5 in a communicating manner, and a vacuum device (not shown) is connected to the exhaust port 6. In addition, when forming the air vent 4 as usual, it is sufficient to form the air vent groove 5 as in the illustrated embodiment, but when the air vent 4 is not formed, the air vent groove 5 is inserted into the cavity 3. It is formed into an annular shape so as to surround it, and the air vent groove 5 and the cavity 3 are communicated through a lagoon or the like. Therefore, during casting, almost at the same time as the mold 1 is closed, the vacuum device connected to the air vent groove 5 is operated,
The air in the air venting groove 5 is discharged, and the gas and air in the cavity 3 and the outside air entering from the parting surface 2 of the mold 1 are discharged to the outside of the mold through the air handling groove 5. Then, if necessary, gas and air in the cavity 3 are discharged from the air vent 4, and in that state, the molten metal is injected into the cavity with an injection device to mold the product. <Effects of the Invention> Since the die casting mold of the present invention is constructed in this way, even if the mold is thermally deformed or has burrs, and there is some gap between it and the parting surface, the mold will not close properly. Outside air that tries to enter the cavity from the rear vertiginous surface is discharged to the outside of the mold through the air vent groove, eliminating the possibility of it entering the cavity. Therefore, the gas and air in the cavity can be quickly discharged from the mold through the air vent, and as a result, the vacuum device connected to the air vent can be small, reducing equipment costs. It will be possible to improve productivity. Moreover, the gas and air in the cavity can be discharged through the air vent groove without the need to form a special air vent to actively discharge the gas and air in the cavity, as in the past. There is no need for a vacuum device to be connected, making it possible to further reduce equipment costs. Furthermore, if the mold of the present invention is used not only for vacuum die-casting but also for ordinary die-casting, it is possible to cast excellent products with fewer cavities even when using ordinary die-casting. Therefore, the intended purpose can be achieved. 4. Brief description of the drawings The drawings show an example of the implementation of the present invention. Figure 1 is a front view, Figure 2 is a front view,
The figure is a sectional view taken along line (2)-(2). In the figure, 1 is a mold, 2 is a parting surface, 3 is a cavity, and 5 is an air vent groove. Patent applicant: Fuso Light Gokin Co., Ltd. Procedural amendment dated July 1986, 1, Case description: 1985 Patent Application No. 215840, 2, Name of invention: Die-casting mold 3, Name of amendment J Relationship to the incident Patent applicant Name (525) Fuso Light Alloy Co., Ltd. 4, Agent

Claims (1)

[Claims] A die-casting mold characterized in that an air-bleeding groove is formed on a parting surface other than a cavity in which a product is molded, and a vacuum device is connected to the air-bleeding groove.