论文部分内容阅读
TB6钛合金是航空制造领域承重结构件的重要材料,属于典型难加工材料。开展了TB6钛合金铣抛喷组合工艺试验,研究了不同铣削参数对表面完整性的影响及精铣与喷丸工序间的耦合关系。结果表明,试件表面粗糙度主要受铣削每齿进给量fz影响。fz<0.2mm/z时,组合工艺加工后,试件表面粗糙度值Ra较低;fz>0.2mm/z时,随精铣fz提高,铣削硬化率下降,喷丸后的表面粗糙度提高;铣喷组合工艺条件下,铣削线速度vs在20~40m/min范围内,硬化率随vs的升高而降低,喷丸区域表面粗糙度升高;vs在40~50m/min范围内,铣削硬化率升高,喷丸区域表面粗糙度降低。切宽ae对试件硬化和表面粗糙度的影响不显著。铣喷组合工艺条件下的精铣参数优化结果为:vs=50m/min,fz=0.2mm/z,ae=1.0mm。铣抛喷组合工艺条件下,可在低于0.4mm/z范围内适当提高铣削每齿进给量fz。
TB6 titanium alloy is an important material in the structure of aviation bearing parts, which is a typical hard-to-process material. TB6 titanium alloy milling and polishing combination process test carried out to study the different milling parameters on the surface integrity and precision milling and shot peening process coupling between the relationship. The results show that the surface roughness of the specimen is mainly affected by the milling feed per tooth fz. fz <0.2mm / z, the surface roughness Ra of the test piece is lower after the combination process; when fz> 0.2mm / z, the milling hardening rate decreases with the increase of the fine milling fz, the surface roughness after shot peening increases ; Under the conditions of milling and jet milling, the linear velocity of milling is in the range of 20 ~ 40m / min, the hardening rate decreases with the increase of vs and the surface roughness of shot peening area increases; vs in the range of 40 ~ 50m / min, Milling hardening rate increases, the surface area of the shot peening decreases. The effect of cutting width ae on specimen hardening and surface roughness is not significant. The optimization results of finishing parameters under milling and milling combined process conditions are: vs = 50m / min, fz = 0.2mm / z, ae = 1.0mm. Milling and polishing combined process conditions, can be less than 0.4mm / z within the scope of the appropriate increase in milling feed per tooth fz.