Extrusion and stretching composite forming equipment for forming large conical cylinder

Abstract

The invention discloses extrusion and stretching composite forming equipment for forming a large conical cylinder. The extrusion and stretching composite forming equipment comprises a die female die, a middle shaft pressing cylinder, an annular pressing cylinder, a middle shaft plunger, an annular plunger, a die male die and an annular pressing ring, a through forming channel is arranged in the middle of the die female die, and the diameter of the forming channel is gradually reduced from top to bottom so that a blank can deform; the middle shaft pressing cylinder and the annular pressing cylinder are coaxially arranged and vertically erected on the forming channel, the lower portion of the middle shaft pressing cylinder and the lower portion of the annular pressing cylinder are connected with the middle shaft plunger and the annular plunger respectively, a through plunger channel is formed in the middle of the annular pressing cylinder, the middle shaft plunger penetrates through the plunger channel, and the die male die, the annular pressing ring and the die female die form a closed space of the upper portion of the blank; and the die male die and the annular pressing ring drive the blank to be downwards extruded out of the forming channel, the shape of the die male die is consistent with that of an inner cavity of the conical cylinder, and a gap between the die male die and the forming channel is equal to the wall thickness of the blank formed conical cylinder. According to the equipment, the high-performance thin-walled cylinder can be manufactured through one-time forming.

Description

technical field [0001] The invention relates to the technical field of forming large components, in particular to an extrusion-stretching composite forming device for forming a large cone. 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 process use...

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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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