Free-forging shortening method and anvil at ultralimit aspect ratio

Abstract

The invention discloses a flat die forging high slenderness ratio ultralimit upsetting method and a flat die forging high slenderness ratio ultralimit upsetting anvil. The upsetting method comprises the following steps: positioning an upper concave anvil and a lower concave anvil, and guaranteeing superposition of a central line of the upper concave anvil and a central line of the lower concave anvil; suspending circular cast ingots of which the slenderness ratio is more than 3 on the lower concave anvil, and adjusting the position to guarantee superposition of central lines of the aluminum alloy circular cast ingots, the central line of the upper concave anvil and the central line of the lower concave anvil; and allowing a power mechanism to drive the upper concave anvil to move down after the adjustment is over, and slowly applying pressure on the aluminum alloy circular cast ingots, so that the aluminum alloy circular cast ingots are stably upset and do not have the defects of bending, folding and the like. The invention breaks through impassable rules of aluminum alloy upsetting in the recent hundred years, and makes the slenderness ratio of the aluminum alloy circular cast ingots be more than 3 and reach 3.3 (phi 820*2,700mm), namely the length of the circular cast ingots increases 240 mm and the weight of the circular cast ingots increases 360 kg after the length of phi 820 mm circular cast ingots increases from 2,460 mm to 2,700 mm, so that the invention provides enough metal margin and creates a loose environment for development of aluminum alloy annular forged pieces.

Description

technical field [0001] The invention relates to an upsetting method and an anvil for aluminum alloy forgings in free forging, and belongs to the field of aluminum alloy processing. Background technique [0002] The blanks used in large aluminum alloy forgings are generally round ingots. In order to improve the internal structure and performance of the forgings, obtain a certain shape and size, and provide ideal blanks for the subsequent production of die forgings or rolled ring forgings, it is often necessary to Round ingots are used for forging blanks, and upsetting is the most important process in forging blanks. The traditional free forging and upsetting methods are as follows: figure 1 As shown, this upsetting method, due to the limitation of stability conditions, when H (or L) is greater than 3 , the original aluminum alloy ingot 5 will be bent during the rough forging process, and will eventually be folded, resulting in scrapping and failing to produce a forging blan...

AI Technical Summary

Problems solved by technology

[0005] With the development of aviation and aerospace industry, aluminum alloy forgings are developing in the direction of large-scale and integrated. For this purpose, the task of providing larger and heavier aluminum alloy forgings is in front of us. constraints, and it is impossible to make large aluminum alloy round ingots in a short period of time. At present, Southwest Aluminum can only provide 820mm qualified aluminum alloy round ingot, in addition, with the increase of the cross-sectional size of aluminum alloy ingot, the metallurgical quality of the ingot is more difficult to control

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