Design and optimization of variable angle spindle/tool-holder mechanism based on Isight
In this article,in order to realize the four-axis CNC machining function based on the three-axis CNC machining center,a variable angle spindle/tool-holder mechanism is proposed,which boasts the low-cost multi-axis CNC function upgrading technology.Firstly,the variable angle spindle/tool-holder mechanism is subject to the structure design,and its kinematic model is set up.Secondly,the parametric model is worked out with the help of ADAMS/View,and the multi-objective optimization design process is formulated through the Isight platform.With the active arm's average torque and angle as well as the connecting rod's total length as the optimization objectives,the NSGA-Ⅱ algorithm is used for multi-objective optimization design.The results of numerical examples show that after the optimization,the active arm's average torque reduces by 15.5％,and the connecting rod's total length reduces by 11.3％,and there is no structural interference in the movement of each part.Therefore,the method of multi-objective optimization design of the variable angle spindle/tool-holder mechanism based on Isight platform is feasible.The optimized mechanism with more reasonable size parameters has maximized power and economy.
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