JPS5884632A - Closed die forging method with superplastic metal - Google Patents

Abstract

PURPOSE:To improve dimensional accuracy of a work by forming a vacant space in a die by moving of a movable part during forging and charging metal into the space. CONSTITUTION:A sample 3 is worked by moving an upper die 2 and a plunger 4 in one body. When forming force increased to a certain value, the plunger 4 is raised to form a vacant space, and further pressing is performed by the upper die 2. Excessive sample flows into the space formed by ascension of the plunger 4, and a rejected part 3A of the sample is formed. When the upper die 2 moves by specified displacement, working is completed and the sample is worked to specified dimension. The rejecting part 3A formed in the space formed by ascension of the plunger 4 is removed subsequently.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a closed die forging method using superplastic metal.

Superplastic metal 1- can be deformed and deformed under low loads, has better mold filling properties, and has an excellent surface condition, making it suitable for processing that requires precise transfer and closed die forging of complex-shaped parts. suitable for

However, even with closed-die forging of superplastic metal, which has these advantages, its dimensions, such as n degrees, and dimensional accuracy in the pressing direction depend on the weight of the processed material, and to improve dimensional accuracy, the amount of 1F of the processed material is It is necessary to accurately control the amount of metal, which is extremely difficult to do with solid materials such as metals, and for this reason, the application of closed die forging using superplastic metals to the processing of precision parts is limited.

Kinoto all removed the upper N1″ chip and used closed die forging with superplastic metal, and during forging, a filling void was created inside the die by moving a movable part formed in a part of the die. The dimensional accuracy of the processed product can be improved by allowing excess metal to flow into the metal and then removing this excess metal by 1/r.

This will be explained in detail in Figure 1 below.

First, FIG. 1 is a cross-sectional view of the mold structure showing the concept of the forging method of the present invention, in which a sample 3 is placed between a lower mold 1 and an upper mold 2. A plunger 4 is provided on the upper stand 8112, and this plunger 4 can be moved separately from the upper die 2 to form a filling gap and allow surplus metal to flow in, which is a feature of the forging method of the present invention. I take it.

Next, as shown in the sectional view of the mold structure in FIG. 2, the upper mold 2 and plunger 4 are moved together to process the sample 3. When the molding force reaches a certain value, the plunger 4 is moved upward as shown in the cross-sectional view of the mold structure in FIG. 6 to form a filling cavity, and further pressure is applied by the upper mold 2. Then, as shown in the sectional view of the mold structure in FIG. 4, the excess sample portion flows into the filling gap formed by the upward movement of the plunger 4, forming a sample waste margin 3A. Processing ends when the upper mold 2 moves by a predetermined amount, and the sample is processed to the predetermined dimensions, and the sample waste 3A created in the filling gap formed by the rising of the plunger 4 is removed later. do it.

FIG. 5 is a perspective view of a product manufactured using VCl similar to I clay, and FIG. 6 is a perspective view of a completed product after removing the sacrificial allowance 3A after shaping.

Products forged from superplastic metal in this way require strict weight control in advance.Moreover, since a sacrificial allowance is set to be convenient for processing after shaping, it is possible to improve workability. It was something I wanted to do.

As mentioned above, the present invention provides that in closed die forging using superplastic metal, a filling void is formed inside the die by a movable part formed in a part of the die during forging, and By flowing excess gold maple into the mold and removing this surplus afterward, it is possible to improve the precision of the dimensions of the processed product.

4.1 Brief explanation of the forging process Figures 1, 2, 3, and 4 are cross-sectional views of the die structure for explaining the concept of the forging method of the present invention, and Figures 5 and 4 are cross-sectional views of the die structure.
FIG. 6 is a perspective view of a finished product produced by the forging method of the present invention.

1. Lower mold 2. Upper mold 3. Sample 3A. Discarded allowance 4. Plunger that's all Applicant: Daini Seikosha Co., Ltd. Agent Attorney Tsutomu Imogami Figure 1 30th 50th Figure 2 Figure 4 60th

Claims (1)

[Claims] In closed die forging using superplastic metal C (Ki
A method for closed die forging using superplastic metal, characterized by forming a filling gap, allowing surplus metal to flow therein, and later removing this surplus.