摘要 在批量生产中,渐开面包络环面(Toroidal Involute,TI)蜗杆修缘和倒角加工自动化程度差且依赖人工。为此,提出一种TI蜗杆齿顶倒角特征建模与数控车削自动编程方法,在通用数控车床上即可实现TI蜗杆和齿顶倒角加工:首先将蜗杆齿面与毛坯外轮廓面进行求交,得到齿顶交线,并根据左右齿面齿顶交线的位置关系,设计出两端修缘车削轨迹;其次由修缘曲面对齿顶交线进行修正,通过齿顶交线离散点位置的空间几何关系获取相邻特征曲面的切矢量并旋转投影到车削XZ平面;再次根据投影切矢量建立齿顶倒角特征模型,进而计算出倒角轨迹和刀位数据;最后将刀位极坐标化,采用锥螺纹车削指令和极坐标刀位进行TI蜗杆的车削倒角数控编程。以TI蜗杆齿顶倒角计算及仿真切削实例验证了TI蜗杆齿顶倒角车削加工方法的可行性。 In mass production,degree of automation for Toroidal Involute(TI)worm trimming and chamfering is poor and the processing is dependent on labor.A TI worm addendum chamfering feature modeling and NC(Numerical Control)turning automatic programming method was proposed.The addendum chamfering of the TI worm can be realized on the general NC lathe.Firstly,the worm tooth surface was intersected with the outer contour surface of the blank to obtain the intersection line.According to the positional relationship of the intersection line of left and right tooth surfaces,trajectory of the trimming turning was designed.Secondly,the intersection line was corrected after trimming surface.The tangent vector of the adjacent feature surface was obtained by the spatial geometric relationship of the discrete point positions,the tangent vector was rotated and projected onto the turning XZ plane.Thirdly,feature model of the addendum chamfering was established according to the projected tangent vector,then the chamfering trajectory and Cutter Location(CL)data were calculated.Finally,the cutter location was converted to polar coordinates,NC programming for turning chamfering of TI worm was realized by using taper thread turning command and polar cutter location.The feasibility of general NC turning chamfering process of TI worm was verified by the calculation example and simulation cutting.
机构地区 扬州大学机械工程学院 南京工大数控科技有限公司
出处 《现代制造工程》 CSCD 北大核心 2021年第4期68-73,共6页 Modern Manufacturing Engineering
基金 国家自然科学基金青年科学基金项目(51905470) 中国博士后科学基金项目(2020M671617) 江苏省高等学校自然科学研究面上项目(19KJB460029)。
关键词 TI蜗杆 齿顶倒角 数控车削 曲面求交 通用数控车床 TI worm addendum chamfering NC turning surface intersection general NC lathe
