Transactions of Materials and Heat Treatment

Title：Research on process parameters of zoned rolling for CNC milling cone-bottomed melon petals with non-uniform mesh

Authors： Hu Deyou Li Jiguang Du Zhengyong Du Jiaming Wang Yalong Chen Fenghe

Unit： Tianjin Long March Launch Vehicle Manufacturing Co. Ltd.

KeyWords： non-uniform mesh CNC milling cone-bottomed melon petals zoned rolling boundary between thinness and thickness inclination height difference of single-sided axis

ClassificationCode：TG386

year,vol(issue):pagenumber：2020,45(9):137-142

Abstract：

Considering factors such as force transmission and space, the bottom structure of launch vehicle box is often designed with cone bottom. For the control of forming accuracy on the CNC milling cone-bottomed melon petals with non-uniform mesh, the process parameters of zoned rolling were explored to investigate the force and deformation trend during the forming process in the mesh area and flange area. The results show that when the cone-bottomed melon petals with CNC milling is restricted by the non-uniform mesh structure, there is a sudden change in the boundary between thinness and thickness and the mesh area and the welding area, and the reverse deformation occurs and restricts each other. At the same time, it is found that the indination height difference of single-sided axis has a small effect on the straightness of the mesh area, but has important effects on the radian gap. Because of the difference in strength between the middle mesh area and the axial upper and lower auxiliary rib areas and the constrained forces in the mesh area, the weld area along the axial direction is concave, and the mesh area along the axial direction is convex. Furthermore, when the clamping gap between upper and lower shafts is 20 mm, the inclined height difference of single-sided axis in the mesh area and the flange area is 90 mm and 110 mm respectively, the radion gap is controlled within 2.0-3.5 mm, and the straightness is controlled within 4.0-5.5 mm.

Funds：

天津市科技支撑项目（17YFZCGX00530）

胡德友（1988-），男，硕士，工程师 E-mail：hudeyou1988@126.com

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