狼友视频在线播放免费无毒,无码成人黄网站在线观看,男JJ插女bb视频全过程,亚洲无码'AV无码,亚洲日韩在线,国产黄片毛耸耸,国产又大又黄又粗又黄视频,久久人人97香蕉超碰精品蜜臀,亚洲13p一区,国产精品一级毛片无码老年人

Basic process performance of machine tool:
1) the machine can be used for inner hole drilling, boring, rolling and scraping.
2) during machining, the workpiece rotates and the cutter feeds, and the cutting fluid enters the machining surface through the oil feeder.
3) during drilling, the internal chip removal process (BTA method) is adopted, i.e. oil is supplied by the pressure head. Through the cutting area, the chips are discharged from the inside of the drill pipe to the chip removal hopper at the back of the bed. When boring, the cutting fluid and chips are discharged forward (head end).
4) machining accuracy of machine tool:
Counter  boring: aperture precision it9-10. Surface roughness: ra6.3.

Precision boring: aperture precision it8-9. Surface roughness: ra3.2.

Rolling: aperture precision it8-9. Surface roughness: Ra0.4.

Straightness of machining hole: less than 0.1/1000.

Outletdeviation of machining hole: less than 0.3/1000
5) machining efficiency of machine tool:
Cutting speed: determined according to the tool structure, material and workpiece material, generally 50-100min.

Feed speed: determined according to the processing conditions, generally 40-100mm / min.

Maximum machining allowance during boring: it is determined according to the structure, material and workpiece of the tool, generally no more than 20 mm.