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我厂多年来生产液压式万能试验机上的测力推杆,如图所示。它的加工难度较大,是同行厂技术交流中的一个共性问题。其加工工艺特性可概述如下: 一、工件的特点 1、长径比大丝杠螺纹外径为M12×1,光杠部分直径为φ12_(-0.05)全长是600mm,细长比为1∶50,这给加工工艺造成了较大的困难。 2、膨胀量大材料为LY12的铝质棒材,其膨胀系数为普通钢材的2倍,车削过程中,工件温度若比原来提高20℃,则丝杠全长要伸长0.27mm,给使用顶针加工增加了困难。 3、刚度差决定金属材料刚度的主要因素是弹性模量,铝材的弹性模量比一般钢材低2倍,因此在多工步的车削过程中,工件弯曲状态时有出现。
Over the years I plant production hydraulic universal testing machine on the test force putter, as shown. Its processing is more difficult, is a common problem in the peer plant technology exchange. The characteristics of its processing technology can be summarized as follows: First, the characteristics of the workpiece 1, large diameter ratio Large screw thread diameter M12 × 1, light bar part diameter φ12 _ (- 0.05) full length is 600mm, slenderness ratio of 1: 50, which has caused greater difficulties in the processing technology. 2, large amount of expansion material LY12 aluminum bar, the expansion coefficient of 2 times the ordinary steel, the turning process, the workpiece temperature than the original increase of 20 ℃, the full length of the screw should be extended 0.27mm, to use Thimble processing has increased the difficulty. 3, the stiffness difference The main factor determining the stiffness of the metal material is the elastic modulus, the elastic modulus of aluminum than the average steel 2 times lower, so turning in the multi-step process, the workpiece bending state there.