| 冷拔时无缝钢管出现缺陷的具体原因 |
| 添加时间：2019/9/29 14:10:49 浏览次数： |
| 冷拔时无缝钢管出现缺陷的具体原因。 Specific reasons for defects of seamless steel tube during cold drawing. 1、无缝钢管的管料和中间管的质量不合格，而且几何尺寸也不符合要求，纵向和横向壁厚严重不均，弯曲度和椭圆度过大，化学成分不相容，力学性能不和。 1. The quality of seamless steel pipes and intermediate pipes is not up to standard, and the geometric dimensions are not up to the requirements. The longitudinal and transverse wall thickness are seriously uneven, the bending and ellipticity are too large, the chemical composition is incompatible, and the mechanical properties are incompatible. 2.不遵守拔制无缝钢管前各准备工序的操作规程。主要的是锤头工艺不正确、化学处理和热处理操作不当、管端有毛刺、修磨质量不高、在运输过程中产生缺陷等; 2. Failure to comply with the operation rules of each preparation procedure before drawing seamless steel tube. The main problems are incorrect hammer head technology, improper chemical treatment and heat treatment operation, burr at the end of pipe, poor grinding quality, defects in the transportation process, etc. 3.没有遵守拔管过程的操作规程。表现在无缝钢管中心线和拔制不一致、拔管模安装不正、开拔速度太快、工具选配不当、芯棒拉杆的直径过大或过小、变形量太大、芯棒送进不及时等; 3. Failure to comply with the operating rules of extubation process. It shows that the center line of seamless steel tube is inconsistent with drawing, the drawing die is not installed correctly, the drawing speed is too fast, the tool selection is inappropriate, the diameter of mandrel rod is too large or too small, the deformation is too large, and the mandrel is not fed in time, etc. 4.拔管模和芯棒的质量不好，包括光洁度差、硬度和强度低、尺寸不合、硬质合金模的镶装不正确等; 4. The quality of drawing die and mandrel is not good, including poor finish, low hardness and strength, improper size, incorrect insertion of cemented carbide die, etc. 5.拔管机失修。如拔管小车倾斜、模座或拔管模本身在中心架上安装不正等。 5. The extruder is out of repair. For example, the tilt of the drawing cart, the improper installation of the die base or the drawing die itself on the central frame, etc. |
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