锻压技术

非均匀网格数铣锥底瓜瓣分区滚弯成形工艺参数研究

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

分类号：TG386

出版年,卷(期):页码：2020,45(9):137-142

摘要：

运载火箭箱底结构考虑到传力及空间等因素，常采用锥形底设计。针对锥形底用非均匀网格数铣锥底瓜瓣的成形精度控制，采用分区滚弯成形工艺参数进行研究，探究网格区及法兰区在成形过程中的受力变形趋势。结果表明：当数铣锥底瓜瓣受到非均匀网格的结构限制时，在网格区与焊接区的薄厚交界处存在突变，出现反向变形，相互制约；同时，发现侧轴倾斜高度差对网格区直线度的影响较小，但对于弧度间隙影响显著；由于中间网格区域与轴向上、下端辅助筋条区的强度差异，且受到网格区受力制约，轴向易呈现焊接区内凹、网格区外凸的现象，当上、下轴夹持间隙为20 mm、网格区侧轴倾斜高度差为90 mm、法兰区侧轴倾斜高度差为110 mm时，弧度间隙可控制在2.0~3.5 mm、直线度可控制在4.0~5.5 mm以内。

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.

基金项目：

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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