A Forming Method of Cylinder Workpiece with Transverse Internal Ribs

Abstract

The invention relates to a method for forming a cylindrical workpiece with transverse internal ribs. The forming method adopts the process of blanking + upsetting + reverse extrusion, and is characterized in that it adopts the processes of grooving, turning over, and turning over the inside of the blank. Rib molds, etc.; among them: the punch of the inner rib mold of the flip blank includes a punch correction ring, a punch plate, a connecting rod mechanism, a spring, a pressure rod, a limit tube, and a pressure ring; the die includes an inner flip die, an inner flip Die support ring and lower template; the invention solves the problem of difficult demoulding when extruding cylindrical parts with large or small mouths. The shear stress of the thick-walled ring rib at the upper end prevents the material from breaking during the overturn and improves the quality of the outer surface of the extruded cylinder; it saves material and has high efficiency, and is suitable for mass production.

Description

technical field [0001] The invention belongs to an extrusion method for forming metal material parts, in particular to a method for forming cylindrical workpieces 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 body is thin-walled (10mm), and the end is thick-walled (100mm wide, 100mm thick), and the overall thickness is different, so it cannot be stretched and formed by sheet metal; 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 method after stamping. Or u...

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, and the machining allowance is large. 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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