基于差动机构的铣削力加载方法研究

Study on Milling Force Loading Method Based on Differential Motion Mechanism

对铣削主轴单元进行切削力加载试验,是获得其加工精度、承载能力、可靠性、寿命等技术参数的一个重要手段。采用差动微进给结构可以在主轴承载范围内进行多试验点加载,加载力大小通过压力传感器读取,可以使测试精度得到保证;加载力通过陶瓷轴承的传递作用到刀杆上,满足高转速的测试要求;而传动系中加载斜面与球的引入可以有效模拟主轴的实际工况。

Cutting-force loading experiment is critical for acquiring some important technical parameters of a milling spindle,in-cluding accuracy,load capacity,reliability,service life,etc. Micro-feed-in capacity of differential mechanism makes sure the multi-point test under the range of spindle bearing allowance. The amplitude of cutting force was gotten from a fine pressure sensor,so the re-sults were direct and persuasive. To meet the high-speed requirements,ceramic ball bearing sets were chosen as the transmission media between the differential mechanism and spindle＆#39;s tool shank. Some bevel and balls were also introduced into experiment unit,which made the actual-working-condition simulation of spindle realize.