Continuous tapered upsetting die and upsetting method for bar material with superhigh height-diameter ratio

Abstract

The invention discloses a continuous tapered upsetting die and upsetting method for a bar material with the superhigh height-diameter ratio. The method comprises the steps that 1, the height of the bar material is obtained according to the diameter of the bar material and the size of a forge piece; 2, the taper degree of a forming wall surface of a male die and the taper degree of a forming wall surface of a female die are selected, and the upsetting frequency, the layer number of the male die, the layer number of the female die, the height of each layer of male die modules and the height of each layer of female die modules are determined according to the taper angles of the forming wall surfaces, the height of the bar material and the upsetting ratio every time; 3, after the bar material, the female die and the male die are heated, first-time upsetting forming is conducted; 4, after first-time upsetting forming is completed, the male die module with the minimum average outer diameter and the female die module with the minimum average inner diameter are removed, second-time upsetting is conducted, and in this way, the steps are conducted till the height-diameter ratio of an upsetting part is smaller than the maximum height-diameter ratio of non-instable upsetting. According to the die, the female die is designed into multiple layered modules of which the inner walls have the certain taper degree, instability of blanks is constrained through the oblique wall of the female die, and then a folding phenomenon cannot be generated.

Description

technical field [0001] The present invention relates to an upsetting process of continuous conical mold for super large aspect ratio bar material and its mold structure, in particular to a non-folding upsetting process for super large aspect ratio, upsetting and unstable folded bar material by using a conical mold Coarse and improve the process technology of deformation uniformity. Background technique [0002] With the continuous development of the national economy, there is an increasing demand for large forgings in key equipment and engineering fields, but the forming and manufacturing of forgings in these fields is relatively complicated and difficult. The volume of raw materials used in this type of forging is large, especially for forgings in the fields of aviation, aerospace, and military equipment, such as large disks and complex impellers, which require high mechanical properties and structural properties, and the quality requirements of forgings for original blanks...

AI Technical Summary

Problems solved by technology

This process is suitable for isothermal forging of magnesium alloys. The height-to-diameter ratio of the billet should not be too large, and the processing of the convex and concave dies and the billet is relatively complicated. Especially for the original billet, each bar must be turned before upsetting. Longer production cycle

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