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厂家推荐改善焊管壁厚精度的措施

文章出处:   发布时间:2018-09-17 10:52:44   浏览:30

焊管壁厚的控制是钢管生产的一个难点,生产中改善焊管壁厚精度的措施主要包含以下几个方面:1、焊管坯加热.加热要均匀,禁止急速升降温度。每次升降温要保持平稳缓慢,最大升降温度不超过30℃。

The control of welded pipe wall thickness is a difficult point in steel pipe production. The measures to improve the accuracy of welded pipe wall thickness mainly include the following aspects: 1. Heating of welded pipe blank, uniform heating, prohibiting rapid temperature rise and fall. Each time the temperature should be kept steady and slow, the maximum lifting temperature should not exceed 30 degrees.

2、定心辊

2. Centering roller

确定定心辊安装是否到位,调整相关抱芯辊的中心、打开角度及各动作的开口大小一致,抱芯辊中心要在轧制线上。

Determine whether the centering roll installation is in place, adjust the center of the relevant core-holding roll, open angle and the size of the opening of each action is the same, the center of the core-holding roll to the rolling line.

3、轧制中心线

3. Rolling centerline

确保穿孔机轧制中心线与穿孔小车中心线一致,避免“上轧制”或“下轧制”,使管坯在穿孔时保持受力均匀。

Make sure that the center line of the piercing mill is consistent with the center line of the piercing trolley, avoid "up rolling" or "down rolling" and keep the tube blank under uniform stress during piercing.

4、轧制工具

4. Rolling tools

对于磨损的顶头、导板、轧辊等轧制工具要及时更换。

The worn tools such as plug, guide plate and roll must be replaced in time.

5、轧制工具安装

5. Rolling tool installation

辊距、导距的中心必须在轧制线上。保证导距和辊距的中心线在穿孔轧制中心线上,即上下辊距相等,左右导距相等。

The center of roller pitch and guide distance must be on the rolling line. Ensure that the center line of the guide distance and the roller distance is on the center line of the piercing rolling, that is, the upper and lower roller distance is equal, the left and right guide distance is equal.

6、穿孔顶杆

6. Perforated ejector pin

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 perforated ejector rod generally chooses the outer diameter of 108mm- 114mm, and the thickness of the wall is greater than 25mm and the wall thickness is uniform.

7、轧机芯棒

7. Mandrel for rolling mill

芯棒要选用壁厚较厚的厚壁管加工,对于规格较小的芯棒,可采用实心坯料代替。壁厚均匀的厚壁管和实心坯料,可以使芯棒弯曲变形的概率大幅度降低,可以有效提高钢管的壁厚精度。

The mandrel should be processed by thick-walled pipe with thicker wall thickness. For smaller mandrel, solid billet can be used instead. Thick-walled tube with uniform wall thickness and solid billet can greatly reduce the probability of mandrel bending deformation, and can effectively improve the wall thickness accuracy of 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,或采用长料直接车削成型。芯棒的外加工精度控制在±0.1mm,芯棒的直度偏差不超过5mm。焊接时,两段芯棒之间插入一个精加工的销子进行定位,以防止焊接造成的总直度偏差过大。

The length of the mandrel is relatively large, usually by turning the outer diameter and then breaking the weld, or by using long material direct turning molding. The accuracy of external machining of mandrel is controlled at + 0.1mm, and the straightness deviation of mandrel is not more than 5mm. During welding, a finely machined pin is inserted between the two mandrels for positioning to prevent the total straightness deviation caused by welding.

9、完善工艺

9, improve the craft.

完善工艺,防止中间拉薄和壁厚增哈欧超过控制范围的情况发生,提高壁厚精度。

Perfect the process to prevent intermediate stretching and wall thickness increase beyond the control range, improve the accuracy of wall thickness.


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