nine key factors to improve the wall thickness accuracy of q345b seamless special-shaped steel tube!
control of wall thickness of q345b seamless profiled steel pipe is a difficult point in steel pipe production. measures to improve the accuracy of wall thickness of q345b seamless profiled steel pipe mainly include the following aspects:
1，加热管
1. heating tube
加热要均匀，禁止快速升降温度。每一个加热和冷却，以保持稳定的慢最大扬程的温度不超过30℃。
heating should be uniform and fast temperature rise and fall should not be allowed. each heating and cooling to maintain a stable temperature of no more than 30 degrees celsius at the slowest maximum head.
2，定心辊
2. centering roll
确定定心辊安装是否到位，拥抱中央核心卷相关的调整打开角度及各动作的开口大小一致，握住擀面杖滚中线。
determine whether the centering roll is installed in place, embrace the adjustment of the opening angle related to the central core roll and the size of the opening of each action, and hold the rolling pin rolling center line.
3，轧制中心线
3. rolling center line
确保一致的穿孔机轧车中心线与孔的中心线避免“卷上”或“下的滚动”使管子保持有效，即使在穿孔。
ensure consistency between the center line of the mill and the center line of the hole. avoid rolling up or rolling down to keep the tube valid, even in perforation.
4，轧制工具
4. rolling tools
对于磨损的顶头、指南罗尔斯和其他滚压工具要及时更换。
for worn plugs, guide rawls and other rolling tools to be replaced in time.
5，滚压工具安装
5. rolling tool installation
滚远，该中心领导必须从轧制线。确保中心线的距离和导辊的穿孔的中心线轧制，该距离等于上部和下部辊从大约相等的带领。
rolling away, the center leader must be from the rolling line. make sure that the distance between the center line and the center line of the guide roll piercing is equal to the distance between the upper and lower rolls from approximately equal lead.
6，穿孔顶杆
6. perforated top rod
穿孔顶杆一般选择外径为φ108mm-φ114mm,壁厚要求≥25mm且壁厚均匀的厚壁管。
the outer diameter of perforated jack rod is 108 mm-114 mm. thick-walled pipe whose wall thickness is more than or equal to 25 mm is generally selected.
7，轧机芯棒
7. mill mandrel
芯棒要选用壁厚较厚的厚壁q345b无缝异型钢管加工，对于规格较小的芯棒，可以用来代替固态坯料。厚度均匀厚壁管和实心钢坯，可以使芯棒弯曲变形的概率大幅度降低，可有效地提高精密钢管壁厚。
the thick wall q345b seamless special-shaped steel pipe with thicker wall should be selected for mandrel processing. for smaller size mandrel, it can be used to replace solid billet. the uniform thickness of thick-walled tube and solid billet can greatly reduce the probability of mandrel bending deformation and effectively improve the wall thickness of precision steel tube.
8，芯棒的精度
8. accuracy of mandrel
芯棒的长细比较大，一般采用先车外径然后打破口焊接，直接打开或长成型材料。芯棒的外加工精度控制在±0.1mm,芯棒的直度偏差不超过5mm。焊接，两段芯棒之间插入一个精加工的销子进行定位，总偏差防止过度焊接的直接结果。
the length of mandrel is relatively large. generally, the outer diameter of mandrel is first used, then the opening is broken and welded, and the material is opened or formed directly. the outer processing accuracy of the mandrel is controlled at <0.1mm, and the deviation of the mandrel's straightness is not more than 5mm. 焊接，两段芯棒之间插入一个精加工的销子进行定位，总偏差防止过度焊接的直接结果。
9，改进工艺
9. improving technology
工艺改进，防止q345b无缝异型钢管中间拉薄和壁厚增哈欧超过控制范围的情况发生。
the process improvement prevents the intermediate thinning and wall thickness increasing of q345b seamless special-shaped steel pipe from exceeding the control range.
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