Forming method for large concave forging

Abstract

The invention discloses a forming method for a large concave forging. The forming method for the large concave forging comprises the following steps of A, performing heat preservation on a steel ingot for 6-7 hours at the temperature of 1220-1240 DEG C; B, performing upsetting drawing out for two times: firstly, performing necking, chamfering and secondary upsetting; then, performing stretching, tail cutting and indentation, pressing to form a concave part, and cutting to obtain a semi-finished product; and C, horizontally placing a low anvil on two mandrel supporters, and putting in the heated semi-finished product obtained in the step B. According to the forming method for the large concave forging disclosed by the invention, the concave forging which is complicated in shape is forged by utilizing a small-tonnage hydraulic press and the steel ingot, and therefore, not only is the quality of the forging satisfied but also the condition of traditional equipment is considered; the utilization rate of the steel ingot is improved, and the concave forging of which lugs are very big can be forged. The inherent quality of the forging can be ensured by a reasonable reheating schedule and enough forging ratio, and the forming and machining dimension of the forging is ensured by reasonable metal deformation and tool use.

Description

technical field [0001] The invention discloses a method for forming a forging, in particular to a method for forming a concave forging. Background technique [0002] It is difficult to forge special-shaped parts on a large hydraulic press. Compared with manual forging on a hammer, the tonnage of the forgings is large, it is difficult to turn over, and the use of tools is relatively simple. Some forgings have a low utilization rate of steel ingots due to their complex shapes, such as large concave forgings. The steel ingot utilization rate is low during forging. as attached figure 1 with figure 2 As shown, firstly, because the two lugs 2 are relatively thin, and furthermore, the recess in the middle is relatively deep. After the action of the upper anvil 1 and the lower anvil 3, the lugs 2 are slender, and the quality of the forging is not easy to guarantee. Moreover, its overall size is large and its shape is complex, so it is difficult to meet the requirements of fla...

AI Technical Summary

Problems solved by technology

When the concave gear is pressed, the two lugs shrink a lot, and it is necessary to leave enough margin to ensure that, so the margin is correspondingly large, and often the shrinkage is too large to be processed enough.

This forging method requires sufficient width and margin to ensure the size of the forging, which requires: first, the steel ingot is large; second, the hydraulic press has a large tonnage; , generally at 45%

[0004] 2. Forge a square plate first, and cut out the recess in the middle by gas cutting. This method is simple, but the steel ingot used requires 26 tons and the utilization rate is only 32%, which is not advisable.

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