LAPPINGsomegeneralinfo(螺纹折叠形成原理)(材料详实)

1、LAPPING 折叠See following pictures as examples for lapping看下述折叠图片.Not OKNot OKLapp ing in threadLapp ing螺纹折叠折叠Not OKNot OKLapp ing in threadMaterialfolds or cracks in the thread profileLapp ing un der microsocope after grinding在螺纹轮廓上有材料折叠及裂纹金相显微镜下剖开后的螺纹折叠Reas ons for lapp ing折叠原因1. Pitch is not adjust

2、ed correctly = matchi ng betwee n movi ng (lo ng) and stati onary (short) thread ing die (see picture 1)螺纹线未正确调整=动静搓丝板未匹配(见图片一)2. To much pressure on bolt when placed between the threading dies (at the begi nning of the threadi ng stati on). Whe n the pressure on the bolt betwee n the two thread ing

3、 dies is to HIGH, the bolt will start to slip in stead of rotate. When the bolt begins to slip you will have lapping. (threading dies are positi oned to close to each other)将工件置于两搓丝板间时压力过大(开始加工螺纹时).当压力过大时螺栓 开始滑移而非旋转.当螺栓开始滑移时就产生了折叠.(两搓丝板间距离太 近)3. 1and 2 can also be caused if there is variation in the

4、 shank diameter betweendifferent lots/containers with the same part = when the bolt is headed in one machine and rolled in a separated thread roller. It is better to roll thread in a boltmaker so you are certa in that the bla nk diameter does not va如果不同 批的零件同一部分螺纹坯径不均匀也会引起序号1及2描述中所产生的折叠=尽可能在同一台设备上镦制

5、并且在一个单独的螺纹设备上加工.由一台设备加工成形(带螺纹)会更好些.这样会确保螺纹坯径不会有变差.4. Not eno ugh pressure on the bolt whe n placed betwee n the threadi ng dies, whe n the pressure on the bolt betwee n the two thread ing dies is to LOW the bolt can be introduced to far between the threading dies (threading dies are positioned to fa

6、r from each other加工螺纹时压力不足.其产生原因是两搓 丝板距离过远时.5. In correct in troductio n (to late or to early) because the in troductio n fin ger is not correct (to long or to short, wrong profile).不正确的引入(过迟或过早) 是因为送料板过长，过短，错误的形状.6. Timi ng of the in troductio n fin ger in relatio n to the moveme nt of the threadi

7、ng dies is not correct (to late or to early送 料时间与搓丝板的运动时 间(过早过晚)不匹配.7. The bla nk is coni cal and therefore not in troduced straight betwee n the threadi ng dies螺纹坯径是锥形时引起工件不能直接引入到搓丝板间8. The blank is not straight and therefore not introduced straight between the threadi ng dies毛坯杆弯会引起工件不能直接引入到搓丝板间.I

8、nspection for lapping 折叠检测For in specti on for lapp ing we take 3 bolts, degrease them and place them for 1 minute in HCL (acid) with 16 % concentration and temp of 80 C. Then rinse with water and dry with compressed air. Check the thread on each bolt un der a烹认仪低秦耆，丸囲取脚可刪踪microscope for lapping and cracks检测螺纹时，我们拿3个螺栓，脱脂除油后 将它们在浓度为16%,温度为80度的盐酸溶液中放置一分钟然后用清水冲 洗干净并用压缩空气吹干在金相显微镜下检验螺纹折叠及裂纹PICTURE 1 (adjustme