Research of Forming Method of Variable Angle Single Point in Incremental Flanging of Metal Tube
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摘要: 在单点渐进管材翻边成形过程中，由于径向成形力大，容易引起管材起皱、破裂等缺陷，降低了成形质量和精度。现提出一种以球头金属棒代替旋压轮，以变角度形式进行薄壁金属管管端翻边成形的工艺方法，通过改变工具头与成形件之间的瞬时接触状态和材料的变形机理，降低成形力，提高成形质量。为验证该成形工艺的可行性，进行了金属管端单点渐进变角度翻边成形试验。结果表明：利用球头金属棒对管材进行变角度翻边，能够有效减小初始径向成形力，成形件的表面质量较好，表面波动幅度较小。Abstract: In the single-point incremental flanging of tube, due to the large radial forming force, it is easy to cause the defects such as wrinkling and crack in tube, which reduces the forming quality and accuracy. A process method for flanging the end of a thin-walled metal tube with a ball-head metal rod instead of a spinning wheel and a variable-angle form is proposed. By changing the instantaneous contact state between the tool head and the forming part and the deformation mechanism of the material, the forming force is reducedand the forming qualityis improved. To verify the feasibility of the forming process, a test platform was built, and a single-point incremental variable-angle flanging test of the metal tube end was carried out. The test results showed that the ball head metal rod for the variable-angle flanging of the tube can effectively reduce the initial radial forming force, the surface quality of the formed part is better, and the amplitude of surface fluctuation is smaller.
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Key words:
- variable angle SPIF /
- tube flanging /
- thinning rate /
- surface quality /
- radial force
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表 2 材料应力应变参数
应力/MPa 应变 应力/MPa 应变 23 0.02 222 0.175 100 0.035 243 0.21 141 0.07 263 0.245 173 0.105 280 0.28 199 0.014 297 0.315 注：应力为0时，应变也为0。 
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表 3 各刀具角度对应进给量
刀具角度/（°） 进给量/mm 刀具角度/（°） 进给量/mm 5 10 30 1.67 10 5.03 35 1.52 15 3.37 40 1.37 20 2.55 45 1.23 25 1.77 50 1.14
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