TC4钛合金深孔钻削试验研究与机理分析
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摘要
TC4钛合金深孔钻削过程中钻削温度高、排屑路径长,加剧刀具磨损,影响深孔加工质量和精度。为制定可用于实际生产的钛合金深孔钻削加工参数,开展TC4钛合金深孔枪钻加工试验。试验结果表明,钻削温度受钻削速度影响较大,进给量的影响不显著;孔径和圆度随着钻削速度的增加而增大,同轴度随着切削速度增加而先增大后减小;孔的表面粗糙度随着钻削参数的增加而增大,且大参数下深孔表面质量进一步恶化;各组试验加工硬化层在30μm左右,且随着钻削速度增加,切屑挤压变形严重。综合分析后制定的干切削条件下TC4钛合金深孔枪钻的钻削速度为20m/min,进给量为0.08mm/r。
In the deep hole drilling process of TC4 titanium alloy, due to high drilling temperature and long chip removal path, the tool wear was aggravated, which affected the quality and accuracy of deep hole. In order to establish the processing parameters for deep-hole drilling of TC4 for actual production process, the gun drilling experiment of TC4 titanium alloy was carried out. The results indicated that drilling temperature was greatly affected by drilling speed, and the influence of feed rate was not significant. Deep-hole diameter and roundness increased with the increase of drilling speed, the co-axiality increased firstly and then decreased with the increase of drilling speed. Surface roughness of deep-hole increased with the increase of drilling parameters, surface quality of deep-hole was further deteriorated under large drilling parameters. Work hardening layer of each group was about 30μm, and with the increase of drilling speed, extrusion deformation of the chip was more serious. After the comprehensive analysis, drilling speed was 20 m/min, feed rate was 0.08 mm/r, which were the optimum processing parameters of TC4 titanium alloy deep-hole gun drilling under dry conditions.
In the deep hole drilling process of TC4 titanium alloy, due to high drilling temperature and long chip removal path, the tool wear was aggravated, which affected the quality and accuracy of deep hole. In order to establish the processing parameters for deep-hole drilling of TC4 for actual production process, the gun drilling experiment of TC4 titanium alloy was carried out. The results indicated that drilling temperature was greatly affected by drilling speed, and the influence of feed rate was not significant. Deep-hole diameter and roundness increased with the increase of drilling speed, the co-axiality increased firstly and then decreased with the increase of drilling speed. Surface roughness of deep-hole increased with the increase of drilling parameters, surface quality of deep-hole was further deteriorated under large drilling parameters. Work hardening layer of each group was about 30μm, and with the increase of drilling speed, extrusion deformation of the chip was more serious. After the comprehensive analysis, drilling speed was 20 m/min, feed rate was 0.08 mm/r, which were the optimum processing parameters of TC4 titanium alloy deep-hole gun drilling under dry conditions.
引文
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[5] ZHANG H, SHEN X, BO A, et al. A multiscale evaluation of the surface integrity in boring trepanning association deep hole drilling[J]. International Journal of Machine Tools and Manufacture,2017, 123:48-56.
[6] ZHANG X, TNAY G L, LIU K, et al. Effect of apex offset inconsistency on hole straightness deviation in deep hole gun drilling of Inconel 718[J]. International Journal of Machine Tools and Manufacture, 2018, 125:123-132.
[7] KUZU A T, BERENJI K R, EKIM B C, et al. The thermal modeling of deep-hole drilling process under MQL condition[J].Journal of Manufacturing Processes, 2017, 29:194-203.
[8] WOON K S, TNAY G L, RAHMAN M, et al. A computational fluid dynamics(CFD)model for effective coolant application in deep hole gundrilling[J]. International Journal of Machine Tools and Manufacture, 2017, 113:10-18.
[9]邱易,雷勇,郑建明,等.深孔加工工具系统研究现状及趋势分析[J].工具技术,2015, 49(12):7-12.QIU Yi, LEI Yong, ZHENG Jianming, et al. Classification and research status of deep-hole cutting tool system[J]. Tool Engineering,2015,49(12):7-12.
[10] WANG Y, JIA W, ZHANG J. The force system and performance of the welding carbide gun drill to cut AISI 1045 steel[J].The International Journal of Advanced Manufacturing Technology,2014, 74(9-12):1431-1443.
[11] WOON K S, CHAUDHARI A, RAHMAN M, et al. The effects of tool edge radius on drill deflection and hole misalignment in deep hole gundrilling of Inconel-718[J]. CIRP Annals-Manufacturing Technology, 2014, 63(1):125-128.
[12]陈五一,袁跃峰.钛合金切削加工技术研究进展[J].航空制造技术,2010, 53(15):26-30.CHEN Wuyi, YUAN Yuefeng. Research development of cutting technology for titanium alloy[J]. Aeronautical Manufacturing Technology, 2010, 53(15):26-30.