基于AD与TRIZ的加工中心主轴松拉刀机构优化设计

Optimized Design of Loose Broach Mechanism for Spindle of Machine Center Based on AD and TRIZ

数控加工中心在加工过程中常出现主轴松刀力不足或无法松刀的现象。针对此问题,通过TRIZ系统组件分析明确现有松拉刀机构各组件间作用关系,利用因果链分析得出影响松刀的根本原因,最终应用TRIZ理论中的物场模型分析方法和AD独立性原理提出优化设计方案。根据新方案计算出实际工况下的主轴松刀力和螺杆强度,并对松刀杆进行建模和仿真。结果表明:最大位移量为6.995μm,最大应力为45.24 MPa,符合结构设计要求。最后,经过现场实物测试,当液压力为5 MPa时,松刀行程、松刀力以及打刀量均符合生产要求,验证了优化设计方案的合理性。

Spindle loose force is insufficient or unsuccessful in the machining process of CNC machining center.To solve this prob⁃lem,the action relationship of the loose broach mechanism was identified by the TRIZ system component analysis,the root reason of af⁃fecting loose tool was found by causal chain analysis of spindle loose broach system.Finally,the optimized design scheme was proposed by using the material field model analysis method of TRIZ theory and the principle of AD independence.The spindle loose force and screw strength of the new scheme were calculated and analyzed under actual working conditions,and the loose tool rod model was built and simulated.The results show that the maximum displacement is 6.995μm and the maximum stress is 45.24 MPa,which can meet the requirements of structural design.Finally,through the physical field test,when the hydraulic pressure is 5 MPa,the loose tool stroke,loose tool force,and cutter loose quantity are in line with the production requirements.The rationality of the optimized design scheme is verified.