JPS6068149A - Pressure casting method using a core - Google Patents

Abstract

PURPOSE:To eliminate the need for the stage of manufacturing an insert core and to improve casting efficiency in the stage of pressure casting of various products by casting the insert core simultaneously with the product by making use of the molten metal well provided in a part of dies and using the same for succeeding casting. CONSTITUTION:A cavity surface 2 having the shape matched with the ruggedness on one surface of a product is formed to a movable die 1 and a cavity surface 4 having the shape mated with the ruggedness on the other surface of the above-described product is formed to a stationary die 3. A cavity 5 is formed between the cavity surfaces 2 and 4 while the mold 1 is mated with the die 3. A groove 7 for attaching an insert core 6 is formed to a part of the surface 4 of the die 3 and a pin 8 to be fitted into the hole 6a of the core 6 is projected to the surface 2 of the die 1. A molten metal well 9 communicating with the cavity 5 is formed on the outside of the surface 2 of the die 1 and has the same shape as the shape of the core 6. The core 6 is simultaneously cast in the molten metal well in the stage of casting the product.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to pressure casting methods such as die casting and low pressure casting, and particularly to pressure casting using a core.

Generally, in pressure casting such as die casting, the molten metal that first flows into the cavity of the mold contains impurities such as a mold release agent or gas, so it is preferable to remove the molten metal. Therefore, a molten metal sump communicating with the cavity is provided in a part of the mold, and all of the original molten metal containing impurities in this molten metal trough A is preferentially transferred to the PIJ metal channel A. All products of
If you try to cast with only a fixed mold and a movable mold, it will not be possible to remove the mold, so when casting a complete product with such a complex shape, it is necessary to place the whole core in advance in the part corresponding to the undercut part in the cavity. We are trying to do the casting by

Conventionally, as a means of turning the above-mentioned core in d1, iron-based cores are manufactured by machining such as fly processing or lathe processing. However,
After the mold is opened, the core is thrown off by an ejector turbine or the like, which causes it to break or get damaged, so it must be replaced with a new one after every casting or after several uses. Therefore, manufacturing the cores individually by machining as in the past is time consuming and has the problem of extremely low work efficiency.

The present invention has been made to improve the above-mentioned conventional problems, and its objective is to solve the following problems. To provide a pressurized casting method using a 11 loaf-placed core, which makes it possible to make a placed core without performing any additional machining work, thereby increasing the efficiency of the entire casting operation.

In order to achieve such an object, the present invention has a molten metal pool formed in a part of the mold in communication with the cavity in the shape of a placing core, and the placed core that is cast in the molten metal pool is used for subsequent casting. The gist of this is that it is set in the cavity during the process.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a plan view of a movable mold of a casting machine used for carrying out the method of the present invention, viewed from the direction of the cavity surface, and FIG. 2 is a cross-sectional view of the molds in a mated state. The movable mold 1 has a cavity surface 2 formed to match the unevenness of one side of a product such as a crankcase, and the fixed mold 3 has a cavity surface 4 formed to match the unevenness of the other side of the product. With the movable mold 1 and the fixed mold 3 aligned, a cavity 5 is formed between the cavity surfaces 2 and 4. A groove 7 for attaching a core 6 is formed in a part of the cavity surface 4 of the fixed mold 3, and a core 6 attached to the groove 7 is formed in the cavity surface 2 of the broken movable mold 1. A pin 8 is provided protrudingly to fit into the hole 6a.

As shown in FIG. 1, a pool 9 is formed on the outside of the cavity surface 2 of the movable mold 1 and communicates with the cavity 5. The shape of this pool 9 is the same as that of the core 6, and when casting a product, the core 6 is simultaneously cast in the pool.

Next, the method of the present invention will be explained step by step. First, the core 6 that was completely cast at the same time when the entire product was cast previously or previously is inserted into the groove 7 of the fixed mold 3. Thus, the movement of the mass core 6 in the direction perpendicular to the paper plane of FIG. 2 is restricted. Next, the movable mold 1 is moved and matched with the fixed mold 3. At this time, the pin 8 of the movable die 1 fits into the hole 6a of the core 6, and also restricts the core 6 in the vertical direction in FIG.
is fixed at a predetermined position within the cavity 5.

From this state, the molten metal M-i is pressurized and filled into the cavity 5,
After the molten metal M has solidified, the movable mold 1 is moved upward in FIG. 2 to open the mold. Then, the part of the core 6 attached to the movable mold 1 is removed integrally with the product.

Next, in the same direction as the movable mold 1 (for example, downward in FIG. 2) V
The protruding ejector pin is activated to eject the product and the core 6 from the movable mold 1. Then, the target object is obtained by ejecting the core 6 attached to the product from the product using another ejector turbine or the like.

Incidentally, the procedure for dispensing the placed core 6 is not limited to the above, but is arbitrary. In the first embodiment, a mold for casting the core 6;
Although the mold for setting the core 6 has been described as being the same, the mold for casting the core 6 and the mold for the cast core 6 are different from each other.
The mold for setting may be different.

Furthermore, in the embodiment, the hot water basin 9 was provided in a fully movable type, but
It may be formed of both a fixed type and a movable type.

As explained above, according to the present invention, when performing pressure casting of various products, the product is cast by fully utilizing the molten metal provided in a part of the mold, and at the same time, the placing core is cast. Since the core is used for the subsequent casting, the process of manufacturing the core by special machining, which was required in the past, can be omitted, and the overall efficiency of casting is greatly improved, and it is completely unnecessary Since the core is cast using molten metal that contains impurities that have a high utility value, there is a lot of waste in materials, and there are many effects such as cost reduction.

[Brief explanation of drawings]

FIG. 1 is a plan view of the movable mold viewed from the cavity surface, and FIG. 2 is a cross-sectional view of the movable mold and the fixed mold assembled together. In the drawings, 1 is a movable type, 3 is a fixed type, 5 is a cavity,
6 is a core, 7 is a groove, 8 is a pin, and 9 is a sump. Patent applicant: Honda Motor Co., Ltd. Representative, Patent Attorney 1) Yobetsu Patent Attorney: Kunihiko Ohashi Patent Attorney: Yu Koyama Figure 1 Figure 2

Claims (1)

[Claims] A placing core characterized in that a pool communicating with a mold cavity is shaped like a placing core, and a placing core cast in the pool is set in the cavity during subsequent casting. Pressure casting method used.