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为制造小型沟槽铜热管,设计和采用了回转模锻工艺进行管端缩径。相比传统的回转模锻,所使用的回转模锻机的轴向进给通过恒定的推力实现。采用实验方法,分析旋转模锻过程中缩径段的沟槽变形,测量和计算管端缩径过程的截面收缩率和伸长率。探讨进给推力对缩径段的直径、表面粗糙度、伸长率和加工时间的影响。结果表明:缩径段的管壁厚度沿着轴向逐渐增长,而外径、表面粗糙度和微观裂纹则沿轴向逐渐减小。此外,推力对伸长率的影响很小,而表面粗糙度则随着推力的增大而减小。因此,采用回转模锻进行管端缩径,在允许范围内,增大进给推力对管端缩径质量有益。
In order to manufacture small grooved copper heat pipe, the rotary die forging process is designed and used to reduce the pipe end. Compared with the traditional rotary forging, the rotary die forging machine used in the axial feed by a constant thrust. The experimental method was used to analyze the deformation of the groove in the reducing section of the rotating die forging and to measure and calculate the section shrinkage and the elongation of the tube in the course of diameter reduction. The effect of feed thrust on diameter, surface roughness, elongation and processing time of constriction section was discussed. The results show that the wall thickness of the reduced section gradually increases along the axial direction, while the outer diameter, surface roughness and microcracks decrease along the axial direction. In addition, the thrust has little effect on the elongation, while the surface roughness decreases with increasing thrust. Therefore, the use of rotary die for pipe end diameter, within the allowable range, increase the feed thrust on the pipe end diameter quality.