视频一区在线观看-日本大尺度做爰呻吟-亚洲第一区视频-国产视频大全-枫可怜av-成熟女人毛片www免费版在线-国产福利视频一区二区-日本色图片-六月丁香激情综合-伊人日日夜夜-中文字幕国产高清

When using honing pipes, please pay attention to:
       When dents appear on the honing tube, the service life of the components will be affected, and the cylinder components will also affect the normal use of the entire system. What exactly causes concave folds to occur? There are just a few possibilities:

       First, the diameter reduction during the cold drawing process is too large or the steel pipe hammer head transitions too quickly;
       Second, the thickness of the pipe wall is uneven and partially too thin;
       Third, the honing equipment is too old and cannot meet the processing requirements of pipes.
   After these numerous improvements, similar bad flaws should be able to be improved.