Extrusion and stretching composite forming method for conical cylinder with large height-diameter ratio

Abstract

The invention discloses an extruding and stretching composite forming method for a conical cylinder with a large height-diameter ratio. The extruding and stretching composite forming method comprises the steps that 1, a blank is put into a mold, specifically, the blank prefabricated into a cup shape is put into a forming channel; 2, extruding, stretching and drawing are carried out, specifically, a die male die and an annular pressing ring are driven by a middle shaft plunger and an annular plunger correspondingly and press downwards, and the pressing speed of the die male die and the pressing speed of the annular pressing ring are independently controlled by a middle shaft pressing cylinder and an annular pressing cylinder; firstly, the bottom of the die male die downwards extrudes the blank to enable the blank to be thinned to form a conical part of the conical cylinder; secondly, the annular pressing ring begins to press downwards, and the blank is extruded by the side wall of the die male die and the inner wall of a die female die to downwards form the side wall of the conical cylinder; 3, stretching and drawing are finished, specifically, after forming of the side wall of the conical cylinder is finished, the annular pressing cylinder retracts and resets, the die male die continues to move downwards, and stretching and drawing of the blank are finished till the die male die drives the blank to penetrate out of the forming channel; and 4, discharging and core pulling are conducted, specifically, the die male die is separated from the blank, and the center shaft plunger is reset by the center shaft pressing cylinder through the annular plunger.

Description

technical field [0001] The invention relates to the technical field of forming large components, in particular to an extrusion-stretching composite forming method of a cone with a large aspect ratio. Background technique [0002] Large cone-shaped components (see figure 1 (a) As a common load-bearing component, it is widely used in equipment. At present, the traditional forming processes for preparing large cone-shaped components are stamping method, spinning method, casting method and extrusion method. [0003] Such as figure 1 (b), the stamping method is to process the components in sections, the straight wall part is welded by sheet metal rolling, the tapered head part is stretched by sheet metal, and then the straight wall and the tapered head are welded to complete, but this process flow Many, low weld strength, difficult to meet the requirements of high mechanical properties of large pressure vessels. [0004] Such as figure 1 (c), the multi-pass spinning forming ...

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Problems solved by technology

[0003] like figure 1 (b), the stamping method is to process the components in sections, the straight wall part is welded by sheet metal rolling, the tapered head part is stretched by sheet metal, and then the straight wall and the tapered head are welded to complete, but this process flow Many, low weld strength, difficult to meet the requirements of high mechanical properties of large pressure vessels

[0004] like figure 1 (c), the multi-pass spinning forming process uses tubular parts as blanks, heats them while rotating, and performs multiple spinning on the tube body by the rotary wheel, which takes a long time and low efficiency

[0005] like figure 2 , Thinning and stretching method, after the bar material is reverse-extruded into a preformed thick-walled tube, it is subjected to multiple wall thickness thinning and stretching, the number of mold sets is large, the cost is high, the number of stretching times is large, the material is heated many times, and the grains are coarse , the component performance is low, the production efficiency is low, and it cannot be used for mass production

[0006] The problems of low strength and low efficiency in the processing of the above-mentioned large cone-shaped components

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