Forming method of cover for spaceflight

Abstract

The invention discloses a forming method of a cover for spaceflight. The forming method comprises the steps of step 1, forming preparation; step 2, track drawing; step 3, spinning forming; step 4, correcting the shape; and step 5, turning and cutting. Compared with the prior art, the forming method of the cover for the spaceflight provided by the invention has the positive effects that 1, compared with an existing forming technology, all information of the spinning process of qualified parts is recorded through a numerical control program, curing of technological parameters is achieved, the percent of pass of the parts is greatly increased, it is guaranteed that the forming quality of the parts is stable and reliable, and the percent of pass of products is larger than 99%; and 2, compared with an existing common spinning technology, starting from a spinning forming mechanism, in other words, progress spinning tensile stress can make the wall thickness of the part thinner than return stroke pressure stress, contact between the part and a blank in the progress stage of the spinning process is greatly reduced, detailed return stroke parameters capable of effectively reducing the wrinkling risk are given, the part thinning rate is effectively controlled, and the wall thickness reduction rate of the cover processed by the numerical control common spinning process is less than or equal to 25%.

Description

technical field [0001] The invention is mainly used in the technical field of forming various covers for aerospace equipment, especially the aluminum cover with a thickness of 1.2mm and 1.5mm, a cylinder wall diameter of 150-230mm, a height of 60-110mm, and a flange width of 10-15mm. Compression forming process. Background technique [0002] In the field of aerospace equipment, the shroud is one of the important structural parts of the rocket body. For a long time, the shroud adopts the production method of manual spinning-correction-shape-cutting. Manual spinning is seriously affected by the skill level and working status of the producer, and the wall thickness reduction rate is between 25% and 40% (required Not more than 34.5%), the product quality consistency is poor, and the qualified rate is often between 50% and 90%; and it is time-consuming and labor-intensive. [0003] At present, there is no organization or individual in China to disclose the forming method of pur...

AI Technical Summary

Problems solved by technology

For a long time, the shroud adopts the production method of manual spinning-correction-shape-cutting. Manual spinning is seriously affected by the skill level and working status of the producer, and the wall thickness reduction rate is between 25% and 40% (required not more than 34.5%), the product quality consistency is poor, and the pass rate is often between 50% and 90%; and it takes a long time and labor intensity

[0003] At present, there is no organization or individual in China to disclose the forming method of pure aluminum shroud parts. Similar existing technologies include: Zeng Chao et al. published an article entitled "Spinning Trajectory and Process Parameters on Multi-pass Drawing Technology" in the journal "Forging Technology" Research on the Influence of Deep Spinning on the Quality of Deep Spinning", studied the influence of different trajectory pass curves and process parameters on the quality of multi-pass deep drawing and spinning of AL6061 and SPCC thin plates with thicknesses of 2 and 1mm respectively. The minimum thinning rates under the optimal parameters are 9% and 7% respectively; however, the size of the formed product is a cylindrical part with a diameter of φ68mm and an unspecified height without a flange, and the diameter of the blank used is φ140mm; and the present invention is aimed at parts For cylindrical parts with flanges with a diameter of φ150-230mm, a height of 60-110mm, and a flange width of about 15mm, the diameter of the blank used is φ250-380mm, and there is a significant difference in the difficulty of controlling the thinning rate between the two.

[0004] In order to solve the problems of time-consuming, labor-intensive, poor stability, and low qualified rate during manual spinning, the present invention proposes a cover forming method. The drawing method of NC spinning process trajectory and the selection of process parameters

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