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阿姆斯勒磨损试验机所用的纯滑动摩擦上试样可以加工成梅花形(图2),这样,每个试样可试验多次。该试样不宜用磨床和铣床加工。由于试样加工精度对磨损试验的结果有很大影响,加工后R20圆弧必须与下试样外圆完全符合,否则,不仅延长其跑合磨损时间,还会造成试样数据不准确。为保证试样加工精度和提高加工效率,我们自制了两套在普通车床上加工磨损试样的专用胎具和制定了比较合理的加工工艺。 1 耐磨试样加工工艺 (1)下料;(2)粗、精车外圆、端面、内孔(钻头);(3)调头车端面至所需的尺寸;(4)专用胎具上活车四个R20圆弧至图纸要求。在上述工艺中,(3)、(4)道工序是保证试样精度的关键工序。因此,我们制做了两套专用胎具,现介绍如下:
The pure sliding friction specimens used at the Amsler Abrasion Tester can be processed into a quincunx pattern (Figure 2) so that each specimen can be tested several times. The sample should not be used grinder and milling machine. As the sample processing accuracy of the wear test results have a great impact, after machining R20 arc must be completely consistent with the outer cylindrical sample, otherwise, not only to extend its running-in wear time, but also result in inaccurate sample data. In order to ensure the sample processing accuracy and improve processing efficiency, we made two sets of special wear and tear in the ordinary lathe tools for the production of special tools and to develop a more reasonable processing technology. 1 wear-resistant sample processing technology (1) cutting; (2) rough, fine car cylindrical, face, bore (drill); (3) turn the car end to the desired size; Live car four R20 arc to the drawing requirements. In the above process, (3), (4) Road process is to ensure the accuracy of the sample process. Therefore, we made two sets of special car tire, are introduced as follows: