数控凸轮轴磨床工件旋转轴转速优化方法.pdf

第50卷第15期
机械工程学报
Vol50 No 15
2014年8月
JOURNAL OF MECHANICAL ENGINEERING
2014
DOI:10.390I/JMIE2014.15,205
数控凸轮轴黁床工件旋转轴转速优化方法
王洪12戴瑜兴,3许君4李宗鉴
(1.湖南大学电气与信息工程学院长沙410082:
2.溯南师范大学工程与设计学院长沙410081;
3.温州大学物理与电子信息学院温州325035
4.宇环数控机床股份有限公司长沙410323)
摘要:根据恒磨除率原理,建立了凸轮轴磨削数学模型。通过对凸轮轴数学模型的分析以及系统驱动能力的限制,确定了工
件转速非圆段的降速比与砂轮水平进给的最大速度、最大加速度、最大加加速度。提出砂轮进给正、反向同步加减速的控制
方法,动态地求解正反向插补会合点同时达到最大进给速度,实现凸轮旋转的最优速度插补。将上述算法进行编程与仿真,
并运用到YTMK-CNC8336-16数控凸轮轴磨床加工中。试验结果表明:采用该方法磨削的凸轮轴升程误差可控制在士0.015mm
以内,工件表面粗糙度达到R。0.25gm,非圆磨削段加工效率提高了30%,实现了凸轮轴的精密高效磨削加工。
关犍词:凸轮磨削;转速优化;加减速控制;插补
中图分类号:TP391
Optimization Method of Workpiece Rotation Shaft Speed of CNC
Camshaft Grinding Machine
WANG Hong '"DAI Yuxing
1, 3 XU Ju
un
LI Zongjian
(1. College of Electrical and Information Engineering, Hunan University, Changsha 410082;
2. College of Engineering and Design, Hunan Normal University, Changsha 410081
3. College of Physics and Electronic Information Engineering, Wenzhou University, Wenzhou 325035
4. Yuhuan CNC Macine Tool Co, Ltd, Changsha 410323)
Abstract: Based on the constant removal rate method, the mathematical model of the cam grinding is buiit. Through analyzing the
cams grinding model, the constraints of cams driver, some systems parameters are obtained, such as the slow-down ratio of
workpiece, and the maximal speed the maximal acceleration and e maximal ifeenial acceleration of the wheels horizontal feed
A control method of the grinding wheel,s feed speed is proposed. The forward and reverse interpolation point can be dynamic solved
to meet the maximum whee feed speed and the optimal intepolation is achieved. Finally, the a] orithm is imulated by Matl
and it is applied to YTMK-CNC8336-16, which is a CNC camshaft grinding machine. The experimental results indicate that the
camshaft lifting error is less than 0. 015 mm, the surface roughness is less than 0.25 um, and the grinding efficiency is increased
by30%
Key words: cam grinding; speed optimization; acceleration and deceleration control; interpolation
垄断,已成为严重制约着我国汽车工业高速发展的
0前
重大问题。
国内外学者一直致力于精密高效非圆磨削技
随着我国节能减排和绿色制造产业政策的实术的研究,并取得了许多研究成果。在非圆磨削方
施以及汽车工业的高速发展,作为汽车发动机关键面,文献[]提出了自适应零相位误差跟踪控制器自
零部件凸轮轴、曲轴等高档数控非圆精密高效磨削动地跟踪旋转凸轮表面法线方向与刀具的切点位
加工设备一直被德国、日本等国的几家少数公司所置,实现非圆轮廓表面加工。文献2-3]认为非圆磨
削是沿黁削切点表面作恒线速度运动并按照恒磨除
科技部科技型中小企业技术创新基金(1C26214305382)和湖南省自率进行修正的。根据该理论建立的凸轮轴磨削数学
然科学基金(133056)资助项目。20131205收到初稿,20140405收到修
改稿
模型取得了实际应用价值,其加工精度和效率仍有