久久国产精品免费一区,国产深夜福利视频在线,中文字幕制服丝袜第57页,上司揉捏人妻丰满双乳电影,国产乱子伦视频一区二区三区,美女裸体a级毛片,国产偷亚洲偷欧美偷精品,国内揄拍国产精品人妻,特黄三级又爽又粗又大,国产在线国偷精品产拍

        Latest News
        2015/3/21
        Comparison bet
        2015/1/22
        The importance
        2015/1/21
        Troubleshootin
        2014/12/15
        Machinery Exhi
        2014/12/15
        Rayliter Works
        Search
        current position:Home > News > Company News

        Five points to pay attention to when operating a cold heading machine

        Source:http://m.rnbe.cn     Author:冷鐓機     Time:2014/8/19     Click:
        Five points to pay attention to when operating a cold heading machine
        (1) The end of the cold heading machine steel bar should be ground flat to ensure the accurate shape of the cold heading anchor head;
        (2) After the multi station cold heading machine and other steel bar upsetting machines, a tensile test must be conducted to verify whether the strength of the anchoring head is qualified. 
        (3) The diameter of steel bars or wires should meet the requirements of the cold heading machine, and steel bars (wires) that are too coarse or too fine cannot be cold headed;
        (4) Within the allowable range of the cold heading diameter of the punching machine, the position of the fixture (screw in or screw out) can be adjusted according to the required anchor head size to obtain a suitable amount of steel bar (wire) extension allowance;
        (5) In the 120-130mm area of the steel bar (wire) cold heading part of the multi station automatic cold heading machine, rust removal and straightening are required.
        欧美日韩一区二区综合另类| 97人妻精品一区二区三区| 粉嫩少妇高潮喷水一二区| 亚洲s色大片在线观看一区| 国产亚洲自在精品久久| 视频一区视频二区同事| 国产精品一级二级三级视频| 久久婷婷国产麻豆91天堂| 日本乱偷互换人妻中文字幕| 无套内谢少妇高潮毛片| 胯下粗长挺进人妻体内电影| 人妻互换精品一区二区| 久久婷婷五夜综合色啪软件下| 精品偷拍一区二区视频| 国产精品久久久99久久| 成人深夜在线视频观看| 热久久这里只有精品1| 国产一区二区在线粉嫩| 欧洲美妇乱人伦视频网站| 日韩乱码中文字幕在线观看| 无码精品人妻一区二区三区中| 色悠久久久久久久综合网| 最新中文字幕自拍视频| 国产精品视频一区二区三区经| 亚洲精品国产熟女久久| 色综合五月激情综合色| 午夜福利午夜福利亚洲| 欧美中文字幕在线精品| 亚洲国产精品无码久久久秋霞1| 国产草草视频在线播放| 日韩不卡一区二区三区四区| 无码国产69精品久久久久网站| 日韩精品三级三级三级| 精品国产一区二区色老头| 欧美日韩一区高清在线观看| 欧美白丰满老太aaa片| 偷自拍亚洲视频在线观看99| av网站在线观看华人免费| 粉嫩一区二区三区精品视频| 欧美日韩在线视频第三区| 视频一区视频二区在线|