外文翻譯---刀具前角對切削加工振動的影響-其他專業(yè)-文庫吧
2024-12-30 09:22 本頁面
【正文】 mostly. Therefore, the geometrical parameters and corresponding machining quality of six tools are selected in this experiment rake angle γ0 is made:20176。,10176。,0176。,10176。,20176。and 30176。, tool cutting edge anglekris 45176。, tool minor cutting edge angle kr′ is 15176。, tool orthogonal clearanceα0 is 8176。, tool cutting edge inclination λ0 is 0176。, corner radius rε is ~, cuting speed V is 20~30mmin1, feed per revolution r1, and beck engage mentap is . Equipment and Instrument In experiment, choose CA6140 lathe (Shenyang First machine Tool Plant Made), electric eddycurrent sensor and riameter WFCⅢ . Electric eddycurrent sensor can be used in dynamic untouched survey, survey range is 0~1500μm, resolving power can reach 1μm。 Measure range of WFCⅢ is ~300μm (Unidirection vibration value), this viameter fairly resists interferance, measured data has quite accurate. 2 Experiment Method and Measured Data Considering up limit of vibration in machining opration, clamp wordpiece on lathe CA6140 with cantilever of threejawchuck. Experiment test device sketch map in indicates: Distance from sensor untouched testing point ( its surface roughnessRa=)to end surface of chuck is 200mm. Sensor is fixed on lathe tail stock, the measured amplitude (only measure the sensitive direction of work piece in machining) is an absolute value of piece relative to lathe guide. Distance between cutting part and outter end of chuck is 50~190mm. Relation between rake angle and amplitute of vibration measured in machining operation see table 1. With measured data in table 1, relation curve of tool rake angle and cutting speed affecting amplitute of vibration is given in . indicates: The measured amplitudes of vibration differently correspond to dif ferent tool rake angle。 with rake angle changing, amplitude varies even at same rake angle, while γ0 0176。, the biggest amplitute occurs at V=50~70m/min。 while γ0≥0176。, it is at V=160180m/min. To each tool, three repeat experiments are done to verify the reliability of above testing data, its trend of vibration is roughly the same, only the amplitude of vibration changes a little all (relative error less 5%). 3 Analysis of Experiment Result On the base of measured data and experiment curve in , analysis is given as fellows: Relation between Rake Angle and Biggest Amplitude In pliance wity table 1, putting data in order, relation between rake angle and bi
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