JPS5933063B2 - Mold equipment for molten metal forging - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold device for molten metal forging that allows a large number of products to be simultaneously obtained by molten metal forging.

Conventionally, in this type of apparatus, as shown in FIG. 1, a plurality of product cavities C are formed in the lower mold a, each connected to each pouring port formed on the upper surface of the lower mold a, and each pouring port is formed in the upper mold d. A sealing part e is formed to seal each product cavity C by inserting it into the mold, and the downward movement of the upper mold d seals each product cavity C.
According to this method, the molten metal is poured into each product cavity C from a separate pouring hole, and the product in each product cavity C is solidified under pressure. It is necessary to take out each product separately, which reduces work efficiency.Furthermore, since each product cavity C is sealed separately at each pouring port, the number of seals increases, making seal leaks more likely.
Further, variations in the amount of poured metal and seal leakage tend to cause variations in the pressurizing force of the molten metal in each product cavity C, which is inconvenient and causes product defects.

The object of the present invention is to provide an apparatus that eliminates such inconveniences, and is composed of a lower mold and an upper mold, and the lower mold has a plurality of product cavities connected to the pouring port on the upper surface, and In the type in which the upper mold is formed with a sealing part that is inserted into the pouring port and seals the product cavity, a concave seat is formed on the upper surface of the lower mold to commonly constitute the pouring port of the plurality of product cavities. and the seal portion is configured to commonly seal the plurality of product cavities in the recess, and the recess is formed deeper than the insertion depth of the seal portion, so that the bottom surface of the recess and the seal are formed deeper than the insertion depth of the seal portion. It is characterized in that a pre-filling space is formed between the bottom surface of the part and the plurality of product cavities to communicate with each other.

Next, one example of implementing the present invention will be explained with reference to FIGS. 2 and 3.

In the drawings, 1 is a lower mold, and 2 is an upper mold that can move up and down. The concave seat 3 constitutes a common pouring port for the plurality of product cavities 4, while the upper mold 2 has a seal portion 5 at its lower end shaped to fit into the concave seat 3. By inserting the seal portion 5 into the concave seat 3, the plurality of product cavities 4 are commonly sealed in the concave seat 3.

Further, the concave seat 3 is formed deeper than the insertion depth of the seal portion 5, and there is a pre-walled area between the bottom surface of the concave seat 3 and the bottom surface of the seal portion 5 to communicate each product cavity 4 with each other. space 6
was formed.

In the drawings, reference numeral 7 indicates a core protruding from the bottom surface of the seal portion 5 of the upper mold 2 in order to be inserted into each product cavity 4 to obtain a cylindrical product, such as an engine piston.

Next, to explain its operation, first, when pouring molten metal, the upper mold 2 is pulled upward, and the molten metal is poured from the concave seat 3 on the upper surface of the lower mold 1, filling each product cavity 4 with the molten metal. .

Next, the upper mold 2 is moved downward, and the seal part 5 is inserted into the concave seat 3, and while sealing this, the molten metal in each product cavity 4 is pressurized. At this time, the molten metal in each product cavity 4 is pre-metalized. They communicate with each other through the space 6, so they are pressurized evenly, and when this is pressurized to a predetermined high pressure of 300 to 2000 phantom/cr;1, the pressing force of the upper mold 2 is kept constant, and the molten metal is hydrostatically applied. Apply high pressure.

At this time, the volume of the molten metal in each product cavity 4 is sequentially reduced while being squeezed and solidified, and the molten metal in the pre-filling space 6 is sequentially poured into the product cavity 4 by the downward movement of the upper mold 2 that follows this. After being pushed in, squeeze solidification is performed in each product cavity 4 while the pre-filling space 6 is used as a pool and molten metal is replenished, resulting in a product with a homogeneous and dense structure.

After solidification is completed, the products in each product cavity 4 are placed in the pre-filling space 6.
Since they are interconnected by the pre-thickness formed in the two, the products can be taken out as one from each product cavity 4, and then the individual products are separated from the pre-thickness.

However, this work can be performed in the same process as conventional finishing processes such as deburring, and there is almost no inconvenience such as an increase in the number of processing steps.

As described above, according to the present invention, the lower mold in which a plurality of product cavities are formed has a concave seat that commonly forms the pouring port for these product cavities, and the upper mold has a seal that commonly seals these product cavities in the concave seat. At the same time, the concave seat is formed so that a pre-filling space is formed between the bottom surface of the concave seat and the sealing part to communicate each product cavity with each other, and the concave seat is Molten metal can be easily and quickly poured into each product cavity with a single pouring operation, and the products obtained in each product cavity are connected to each other by the pre-filling that solidifies in the pre-filling space. These product cavities can be taken out in one piece, significantly improving work efficiency, and since these product cavities are commonly sealed in a concave seat, the sealing area is reduced compared to a type that seals each separately, reducing seal leakage. Also, when pressurizing the molten metal, the molten metal in each product cavity communicates with each other through the pre-filling space, and is pressurized uniformly without causing any variation in pressurizing force, and the pre-filling space is Functioning as a molten metal pool, it is possible to reliably squeeze and solidify the molten metal in each product cavity, and has the effect of obtaining excellent products with no disparity in quality.

[Brief explanation of drawings]

1 is a cross-sectional side view of a conventional device, FIG. 2 is a cross-sectional side view of an example of the device of the present invention, and FIG. 3 is a cross-sectional plan view taken along the line 1--2 in FIG. 1...Lower mold, 2...Upper mold, 3...Concave seat, 4...
Product cavity, 5...Sealing part, 6...Pre-filling space.

Claims (1)

[Claims] 1 Consisting of a lower mold and an upper mold, the lower mold has a plurality of product cavities connected to the spout on the upper surface, and the upper mold has a seal part that is inserted into the spout and seals the product cavity. A type in which a concave seat is formed on the upper surface of the lower mold to commonly form a pouring port for the plurality of product cavities, and the sealing portion is commonly used to seal the plurality of product cavities in the concave seat. and the concave seat is formed deeper than the insertion depth of the seal portion, and a pre-filling space that communicates the plurality of product cavities with each other is formed between the bottom surface of the concave seat and the bottom surface of the seal portion. 1. A mold device for forging molten metal.