一种液性塑料的薄壁类零件磨削夹具的设计

Design of grinding fixture for thin wall parts of liquid plastics

为提高薄壁类零件外圆磨削的加工精度,利用液性塑料设计了一种薄壁类零件磨削夹具.对该液性塑料的外圆磨削夹具进行理论分析表明,薄壁套对薄壁类零件产生的径向膨胀应力(25.22 MPa)能够克服薄壁类零件外圆磨削所产生的摩擦力(200 N).利用Workbench软件对薄壁套的变形进行有限元分析表明,密封腔液性塑料的压强达到7.44 MPa时,液性塑料对薄壁套的外表面可产生101.78 MPa的径向膨胀应力.通过对套阀阀芯进行仿真和对螺塞拧紧力矩进行理论计算表明,拧紧螺塞所需的拧紧力矩为2.58 N·m,套阀阀芯的最大变形为0.0021 mm,最大应力为25.22 MPa,最大应变为0.00013 mm.对夹具进行可靠性分析表明,其应力可靠度为100%.以上结果表明,本文设计的基于液性塑料薄壁类零件磨削夹具安全可靠,可用于磨削加工薄壁类零件.

In order to improve the machining accuracy of cylindrical grinding of thin-walled parts,a kind of grinding fixture for thin-walled parts was designed using liquid plastic.The theoretical analysis of the fixture shows that the radial expansion stress(25.22 MPa)produced by the thin-walled sleeve on the thin-walled parts can overcome the friction force(200 N)produced by the cylindrical grinding of the thin-walled parts.The finite element analysis of the deformation of the thin-walled sleeve by workbench software shows that when the pressure of the liquid plastic in the sealing chamber reaches 7.44 MPa,the radial expansion stress of 101.78 MPa can be produced by the liquid plastic on the outer surface of the thin-walled sleeve.Through the simulation of the valve core and the theoretical calculation of the screw plug tightening torque,the results show that the required tightening torque is 2.58 N•m,the maximum deformation of the valve core is 0.0021 mm,the maximum stress is 25.22 MPa,and the maximum strain is 0.00013 mm.The reliability analysis of the fixture shows that the stress reliability is 100%.The results show that the fixture designed in this paper is safe and reliable,and can be used for grinding thin-walled parts.