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我厂生产的大吨位液压万能试验机,油路系统压力甚高,油管采用45无缝钢管,管长有的达4m多,孔径分φ8、φ11mm两种。由于管理不善,大批油管孔壁出现锈斑、氧化脱落等。针对这一质量问题,我们采用油管孔壁旋拉削新工艺,使大批无法使用的高压油管获得了新生。图1为油管孔壁旋拉削示意图。细长拉杆2用20圆钢,其直径视被加工油管孔的尺寸大小而定,它与油管孔径的间隙一般取2.5～4mm,拉杆长度比油管长出100～150mm。例如我们旋拉削孔径φ11mm油管,采用φ8mm的光圆钢作为拉杆。市场上现货购买的圆柱型钢
I plant the production of large-tonnage hydraulic universal testing machine, oil system pressure is very high, 45 seamless steel tubing, pipe length up to 4m more, aperture sub-φ8, φ11mm two. Due to poor management, a large number of tubing hole rust, oxidation loss and so on. In response to this quality problem, we adopted a new process of tubing hole wall pull pull, so that a large number of unusable high-pressure tubing reborn. Figure 1 is a schematic drawing of tubing hole screwing. Slender rod 2 with 20 round bar, the diameter of the tubing hole size depends on the size, it and the tubing aperture of the gap generally take 2.5 ~ 4mm, rod length than the tubing grow 100 ~ 150mm. For example, we cut the hole diameter φ11mm tubing, using φ8mm light bar as a rod. The market to buy the cylindrical steel section