弯曲振动车削刀尖位置对于熨压特性的影响

The Point Position interfere with Ironing Characteristics of Bending Vibration Cutting

分析弯曲振动车削过程中刀具以及工件的运动特性,建立刀具与工件的几何运动轨迹模型。理论上分析不同刀尖位置对于切削后材料的熨压效果以及刀具磨损情况。提出工件运动速度与刀具振动速度共线为临界位置的概念,当刀具低于临界位置时,刀具往回运动时不会接触切削表面不存在熨压效应,并且存在一个临界后角,当刀具后角小于临界后角时,将会发生后刀面干涉。当刀具高于临界位置时,刀具往回运动时后刀面对已切削材料表面具有冲击挤压作用存在一定的熨压效应,同时刀尖受到冲击挤压容易崩刃。通过刀尖上偏于临界位置的运动轨迹图发现,较小的后角可以有效地提高刀尖的强度,避免崩刃。通过实验,针对淬硬材料分析刀尖位置对于车削后的表面形貌以及刀具磨损情况,证明了刀尖位置对于表面形貌,熨压特性以及刀具磨损的影响。

It analyzed motion characteristics of bending vibration cutting in the process of tool and workpiece,building motion locus model between tools and workpiece,and analyzed the different tool position effect on ironing and pressure and tool wear.It advanced a new concept of the movement speed and tools vibration velocity of line in critical positions.When below the critical positions the tools did not have ironing effect because tools moved backwards and did not contact the surface and existed a critical back angle,when the tool back angle was bigger than critical back angle it will appear interference flank.When the tool is higher than critical positions,major flank will impact cutting surface exist ironing effect,meanwhile the impaction will damage the tool.Study of motion locus of the tool is higher than critical positions,and less back angle can improve strength of the tool and avoid tipping.For the hardened materials analysis the different tools position have different effect on surface topography pressure and tool wear during the experiment.Proof the different tool position have different effect on surface topography ironing characteristics and tool wear.