Forging method for complex thin-rib stainless steel die forging with center hole

Abstract

The invention relates to the field of structural member die forging and provides a forging method for a complex thin-rib stainless steel die forging with a center hole. The method includes the steps that a bar is blanked into a billet; burrs on the two end faces of the billet are ground and removed; the ground billet is heated and then forged to form a free-forging blank; the free-forging blank is heated and then pre-forged to form a pre-forged piece, a hole is punched in the center of the pre-forged piece through waste heat, and the size of the punched hole is smaller than the required size of an inner hole of the forging; surface defects of the pre-forged piece are ground; the pre-forged piece is heated and then is finish-forged and formed at a time to form the forging, and after forging is stopped, edge cutting is conducted on the forging through a punch press by means of waste heat; the forging is heated, the punch press and a final punching die are used for punching a triangular hole in the center of the forging; stress relieving, quenching, tempering and forging hardness detecting are conducted on the well-machined forging; and shot blasting de-scaling is conducted on the forging.

Description

technical field [0001] The invention relates to the field of die forging of structural parts, and relates to a forging processing method for complex stainless steel parts with irregular shapes, thin ribs and intermediate holes. Background technique [0002] The general forging process of stainless steel die forgings with intermediate holes is: bar blanking→grinding burrs→heating, pre-forging, edge trimming with residual heat→grinding→heating, final forging, edge trimming with residual heat (repeat until the die is hit, 3 -4 fire times) → heating → punching → grinding → heat treatment → shot blasting to remove scale → flaw detection → grinding → marking → final dimensional inspection → delivery. [0003] For forgings with irregular shapes, thin ribs, and middle holes, there are several problems in the production of forgings with general forging methods: first, in order to ensure that the forgings are full, raw materials are wasted by directly using bar forging; if the middle ...

AI Technical Summary

Problems solved by technology

[0003] For forgings with irregular shapes, thin ribs, and middle holes, there are several problems in the production of forgings with general forging methods: first, in order to ensure that the forgings are full, raw materials are wasted by directly using bar forging; if the middle hole is punched after pre-forging, thin It is difficult to fill the ribs during final forging. In addition, due to the underpressure in the thickness direction of the forging, small-sized burrs are generated inside the middle hole after the final forging is completed. Punching with a punching die results in larger burrs, which need to be manually polished and removed, which requires a lot of work. Large and difficult to guarantee the size, otherwise it is necessary to use machining methods to remove small-sized burrs, which will bring additional machining workload and increase the production cost of forgings; if there is no punching after pre-forging, first the forgings will be plate-shaped as a whole, and the deformation resistance will be greatly increased. Increase, it needs to be forged for 3-4 fire times to be able to hit it, resulting in increased cost, and the forging deformation of each fire is small, it is easy to fall into the critical deformation zone, resulting in metallurgical defects with coarse metal grains; secondly, the metal flow in the middle part is blocked , flows abnormally to the surrounding thin ribs, and produces deep rib-piercing and folding defects around the root of the thin ribs, which cannot guarantee the quality of forgings

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