JPS6021023B2 - Molten metal forging method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flaw forging method in which molten metal poured into a die is solidified under pressure with a press die inserted into the die.

In the secondary molten metal forging method, the internal pressure of the molten metal is rapidly increased from the molten state as shown in Figure 4, and during the squeeze solidification process, the internal pressure of the molten metal is rapidly increased from the molten state as shown in Fig. Generally, a formula is used to reach the maximum pressure, but in this case the pressure during squeeze solidification is 300 to 20
009/ Due to the high pressure of the base, if the seal between the mold and the press is not perfect, the molten metal may spray out or the pressure may drop, which may adversely affect the product. The present invention
The purpose of this method is to provide a molten metal forging method that does not cause such inconveniences. The mold is of a type that is pressure solidified with a sealing part to be joined, and the insertion of the pressing mold is temporarily stopped at the initial stage of pressurization after the sealing part is joined to the insertion opening. and that this stopping time is necessary and sufficient time for the solidification of the molten metal that will infiltrate into the seal defect that is expected to occur when a seal defect occurs due to poor sliding between the insertion port and the seal portion. Features.

Fig. 1 shows a mold loop for forging with flaws, where 1 is a mold having an internal cavity 2 and an insertion opening 3 at the upper end, and 4 is a press die inserted into the cavity 2 from the insertion opening 3. , the press die 4 is provided with a seal portion 5 that is fitted to the inner periphery of the insertion opening 3 to seal the die 1.

In this case, if the sealing part 5 and the insertion opening 3 are properly aligned, the sealing performance will not be impaired even under high pressure, but if the sealing part 5 and the insertion opening 3 are worn out or deformed due to repeated use, the sealing performance will not be impaired. Seal cannot be performed. However, according to the present invention,
Even in this case, a sufficient seal can be obtained. The present invention will be described in detail below. First, a drop of molten metal is poured into the cavity 2, and then the mold 4 is moved downward as shown in FIG. 2A and inserted into the insertion opening 3.

Then, the insertion of the press die 4 is temporarily stopped in the state shown in FIG. 2b, where the seal portion 5 is fitted into the insertion opening 3 and the molten metal begins to be pressurized by the insertion of the press die 4. At this time, the molten metal enters the defective seal between the insertion port 3 and the seal portion 5, is immediately cooled and solidified between the two, and a burr is formed in the defective seal. When this is done, restart the insertion of the press die 4, and
When Skutozu solidification is performed under high pressure as shown in the figure,
The defective seal area is completely sealed by this burr, and the sealing performance is not impaired.

According to experiments, port water made by melting aluminum alloy (Japanese Industrial Standard AC Hina material) at 700 to 800 qo was heated to a maximum pressure of 20 qo.
When forging molten metal in 00k9/ground, even if a mold device with a defective seal is used that has a gap of about 1 side between the insertion port 2 and the seal portion 5, the internal pressure of the molten metal at the initial pressurization will be 0 to 1k9. /
A good sealing performance was obtained by stopping the insertion of the mold 4 for 1 to 3 seconds when the mold 4 reached the opposite end.

It is to be noted that it is even more effective if internal gaps 3a and 5a for cooling are formed between the insertion port 3 and the seal portion 5 as shown in the third figure, since the solidification of the molten metal that has entered the defective seal portion is accelerated.

As described above, according to the present invention, the insertion of the press die is temporarily stopped at the beginning of heating, and even if the seal between the die and the press die is not perfect, the falling sun that has entered the seal defective part when the press die insertion is stopped solidifies. A burr is formed, and the defective sealing part is sealed by the burr, which has the effect that the molten metal can be pressurized to a desired high pressure without causing the molten metal to spout when the mold is subsequently inserted.

[Brief explanation of the drawing]

Fig. 1 is a cut side view showing an example of a mold device for hot moat forging, Fig. 2 bbc is an enlarged cut side view of the main parts explaining the operation of the present invention, and Fig. 3 is another die device. FIG. 4 is a diagram showing pressure changes in molten metal forging. 1...Mold, 2...Press mold, 3...
...Insertion port, 5... Seal part. Figure 1 Figure 2 Figure 3 Figure 3

Claims (1)

[Claims] 1 In a type in which molten metal poured into a mold is solidified under pressure with a press die that is inserted into the die and is equipped with a sealing part that fits into the insertion opening of the die, the insertion of the press die is Pressure is temporarily stopped at the initial stage after the seal part is fitted into the insertion opening, and this stopping time is set to stop when a seal failure occurs due to poor sliding between the insertion opening and the seal part. The molten metal forging method is characterized in that the time is necessary and sufficient for solidification of the molten metal that enters the expected seal failure area.