Forming method of cylinder workpiece with transverse inner rib

Abstract

The invention relates to a forming method of a cylinder workpiece with a transverse inner rib. According to the forming method, the procedures of blanking, upsetting and backward extrusion are adopted, and the forming method is characterized in that the procedures of grooving and overturning, overturning a blank inner rib die and the like are adopted; a male die of the overturning blank inner rib die comprises a male die correcting ring, a male die pressing plate, a connecting rod mechanism, a spring, a pressing rod, a limiting pipe and a pressing ring; and a female die comprises an inner overturning female die body, an inner overturning female die body supporting ring and a lower die plate. The problems that a cylindrical part with a large body and a small opening is extruded, and demolding is difficult are solved, a female die opening is designed to be a large-arc-shaped fillet, the shearing stress generated when a thick-wall annular rib at the upper end of a backward extrusion cylinder workpiece is overturned is reduced, material breakage during overturning is prevented, and the quality of the outer surface of an extrusion cylinder is improved; and materials are saved, efficiency is high, and the forming method is suitable for batch production.

Description

technical field [0001] The invention belongs to an extrusion method for forming a metal material workpiece, in particular to a forming method for a cylindrical workpiece with transverse internal ribs. Background technique [0002] At present, for cylindrical workpieces with transverse internal ribs at the ends, such as certain types of large pressure vessels (see figure 1 ) manufacturing, the structural characteristics of the workpiece: ①The cylinder is thin-walled (10mm), and the end is thick-walled (width 100, thick 100), the overall thickness is different, and it cannot be stretched and formed by sheet metal; ②Extrusion method can only Forming a thick-walled cylinder with the same inner diameter (110) as the end portion results in a large waste of material. [0003] Such as figure 1 As shown, for the cylindrical workpiece 1 with transverse internal ribs, the traditional forming process mostly adopts the machining method after extrusion, casting method, and welding metho...

AI Technical Summary

Problems solved by technology

The material utilization rate of this method is less than 20%, and the performance of machined parts is low, which cannot meet the high strength requirements of pressure vessels

[0004] 1. Traditional casting is used for forming. There are many defects in castings, such as pores, trachoma, etc., which lead to low yield due to porosity, coarse grains, and low mechanical properties, which make it difficult to meet high mechanical property requirements.

[0005] 2. Firstly, the stamping method is used to process the workpiece in sections. The horizontal rib part 1-1 is extruded and then machined. The straight wall part of the cylinder workpiece is formed by thin plate stretching, and then the straight wall part is welded to the horizontal rib. There are many processes and the weld strength is low, so it is difficult to meet the requirements of high mechanical properties of large pressure vessels

[0006] 3. Extrusion is used to form the cylindrical workpiece first, and the bar is subjected to pier roughening, and then back-extruded into a cylindrical part with a wall thickness of 110, and then mechanically processed; the wall thickness of the extrusion cylinder is large, the machining allowance is large, and the machine High cost, time-consuming and labor-intensive, low utilization rate of materials

[0007] In short, for the manufacture of cylindrical workpieces with transverse internal ribs at the end, there are problems of material utilization, low strength of ring ribs, long machining period and high cost in traditional technology.

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