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B690液压牛头刨床的换向阀、操纵阀、变级阀和制动阀等阀体级位的加工是在 C630车床上进行的,由于测量困难,精度很难保证,废品率高,产量也低。操纵阀的结构如图所示,每个级位都有精度要求,以前的精度要求是±0.1毫米,后来降到±0.2毫米。在车床上用镗刀加工级位测量比较困难,以前采用的测量方法是存床身上固定一把钢尺,溜板上装一架显微镜,将刻度放大20倍,凭工人经验定
B690 hydraulic shaper valve, control valves, variable valves and brake valves and other body-level processing is carried out in the C630 lathe, due to the measurement difficulties, the accuracy is difficult to guarantee, the rejection rate is high, the yield is low . The structure of the control valve as shown, each level has precision requirements, the previous accuracy requirements of ± 0.1 mm, and later dropped to ± 0.2 mm. In the lathe with boring knife processing level measurement is more difficult to measure the method used before the bed is fixed on a steel ruler, slide plate mounted on a microscope, the scale magnified 20 times, with the experience of workers