关键词: 曲线磨削, 往复运动, 速度规划, 磨削力, 急动度

Abstract: Reciprocating machining was common in metal cutting such as grinding and planing, the smoothness of the machining processes directly affected the machining quality, energy efficiency and even the life of the machine tools. Firstly, the influences of reciprocating(stroke) motion speed planning on the smoothness of motion processes were explored, based on the analysis of the kinematics performance of common speed planning, according to the characteristics of grinding stroke motion, it was proposed to reduce the influences of soft impact on machined surface quality by changing the spatial distribution of jerks, and two speed planning algorithms were designed based on jerk continuity. Then, the relationship between speed planning algorithm and grinding force smoothness, machining surface roughness and machining energy consumption were studied, the method of reducing energy consumption by changing the spatial distribution of acceleration was proposed.The experimental results show that the speed planning of reciprocating motions is related to the smoothness of grinding forces, the roughness of machined surfaces and the energy consumption of machining. By changing the spatial distributions of jerk and acceleration, the smoothness of grinding forces and the quality of machined surfaces are improved, and the energy consumption of machining is reduced.The comprehensive performance of the proposed type Ⅱ speed planning is superior to other planning. Compared with the trapezoidal speed planning, the cutting force fluctuation, machining surface roughness and motor driving energy consumption are significantly reduced.

Key words: curve grinding, reciprocating motion, speed planning, grinding force, jerk