MENU

/
/
Defects caused by improper removal of internal burrs on cold roll forming machine

Defects caused by improper removal of internal burrs on cold roll forming machine

  • Sort:Information
  • Auth:
  • Source:
  • Release time:2022-04-24 11:30
  • Pvs:

【概要描述】Whether the burr removal process of the cold roll forming machine is appropriate directly affects the quality of the welded pipe. Sometimes grooves are left due to the scraping of the scraper, which is rejected by the user as a welding defect, which brings serious economic losses to the steel pipe manufacturer.

Defects caused by improper removal of internal burrs on cold roll forming machine

【概要描述】Whether the burr removal process of the cold roll forming machine is appropriate directly affects the quality of the welded pipe. Sometimes grooves are left due to the scraping of the scraper, which is rejected by the user as a welding defect, which brings serious economic losses to the steel pipe manufacturer.

  • Sort:Information
  • Auth:
  • Source:
  • Release time:2022-04-24 11:30
  • Pvs:
Detail

Whether the burr removal process of the cold roll forming machine is appropriate directly affects the quality of the welded pipe. Sometimes grooves are left due to the scraping of the scraper, which is rejected by the user as a welding defect, which brings serious economic losses to the steel pipe manufacturer.

 

In this case, the inspection agency found a black negative image with a width of about 3mm and perpendicular to the annular seam near some of the girth welds during the ray inspection of the pipeline butt joints during the installation process (Figure 1). Unfusion defects of grooves produced during pipe making. The staff found that there was indeed a groove with the same width as the negative image near the welding seam of the welded pipe (Figure 2), but the groove was not located on the welding seam, so they doubted the inspection party's statement, and combined with the production of the batch of welded pipes. It is proposed that the groove is caused by the deviation of the scraper when removing the burr. This claim was verified by comparing the width of the image with the size of the squeegee.

 

Cold roll forming machine

 

Cold roll forming machine

 

Formation of internal burrs in welding

Under the action of the proximity effect and the skin effect of the high-frequency current, the edges of the formed tube blank are rapidly heated to a molten and semi-molten state, and the partially molten metal is extruded when entering the extrusion roll. Burrs are formed on the inner and outer surfaces. The molten metal entering the inner wall of the welded pipe forms the inner burr of the welded pipe weld; the burr extruded from the outer surface of the welded seam becomes the outer burr. Since the internal burr and removal equipment are in the tube, it is difficult to remove it, which has become one of the major technical problems in the production of cold roll forming machine.

 

Common Problems During Internal Burr Removal

Common problems in the process of internal burr removal mainly include scraping deviation, excessive or small scraping amount, and unclean cleaning. No matter what kind of problem occurs, it will affect the quality of the weld. Under normal circumstances, scraping deviation is the most common phenomenon in cold roll forming machine. Scraping deviation will lead to unclean removal of internal burrs or local thinning of the pipe wall, stress concentration at the edge of the scraper, and in severe cases, it will affect the pressure bearing capacity of the welded pipe.

 

Solution

The internal burr scraping deviation is mainly manifested as intermittent deviation to one side or both sides. The deviation of the inner burr to one side is mainly caused by the deviation of the center position of the tool holder from the weld. The main reason for this problem of the cold roll forming machine is generally that the position of the connecting plate of the tool bar is not suitable. The position of the tool bar can be adjusted through the adjusting bolt of the connecting plate until the scraping phenomenon disappears. In addition, another kind of scraping phenomenon is the intermittent deviation on both sides. In this case, the height of the cutter head is generally too much higher than the support wheel, which can be solved by adjusting the relative height of the cutter head and the support wheel;the cutter bar connecting plate The loosening of the lock nut can also cause intermittent deviation on both sides when the internal burr is scraped, and the nut needs to be re-locked.

 

It can be seen from this case that the scraping phenomenon when removing internal burrs will not only lead to local thinning of the welded pipe wall, but also affect the pressure bearing capacity of the welded pipe in severe cases. The groove left after the scraper passes through locally produces stress concentration and bears hoop stress, which causes fatigue in the process of pipeline decompression and boosting. Even a small operating pressure can cause the pipeline to fail in an instant, resulting in an accident. . At the same time, once the scraper deviates seriously, resulting in the failure of the whole batch, it will increase the production cost of the welded pipe manufacturer.

 

Part of the content of this site comes from the Internet. This site only provides information storage. The copyright belongs to the original author. It does not bear the relevant legal responsibility and does not represent the views and positions of this site. Please contact and delete it if there is any infringement.

关键词:

More News

Solutions to difficulties in thick-walled pipe forming of directly forming to square pipe mill (1)
Solutions to difficulties in thick-walled pipe forming of directly forming to square pipe mill (1)
Solutions to solve the difficulties in forming thick-walled tubes of directly forming to square pipe mill include special forming unit solutions, rough forming pass solutions, fine forming pass solutions and comprehensive solutions. Let me introduce the solution to the difficult forming of thick-walled tube(1).
Detail
Solutions to solve the difficulties in forming thick-walled tubes of directly forming to square pipe mill include special forming unit solutions, rough forming pass solutions, fine forming pass solutions and comprehensive solutions. Let me introduce the solution to the difficult forming of thick-walled tube(1).
Solution for thick wall tube forming of used round pipe to square pipe machines(2)
Solution for thick wall tube forming of used round pipe to square pipe machines(2)
In the welded pipe industry, people generally regard welded pipes with a wall thickness to outside diameter (thickness-to-diameter ratio) of 12%≤t/D≤18% as thick-walled pipes. Difficulties in used round pipe to square pipe machines, clearly put forward the adjustment methods of thick-walled tube forming.
Detail
In the welded pipe industry, people generally regard welded pipes with a wall thickness to outside diameter (thickness-to-diameter ratio) of 12%≤t/D≤18% as thick-walled pipes. Difficulties in used round pipe to square pipe machines, clearly put forward the adjustment methods of thick-walled tube forming.
Solutions to difficulties in thick-walled pipe forming of directly forming to square pipe mill (1)
Solutions to difficulties in thick-walled pipe forming of directly forming to square pipe mill (1)
Solutions to solve the difficulties in forming thick-walled tubes of directly forming to square pipe mill include special forming unit solutions, rough forming pass solutions, fine forming pass solutions and comprehensive solutions. Let me introduce the solution to the difficult forming of thick-walled tube(1).
Detail
Solutions to solve the difficulties in forming thick-walled tubes of directly forming to square pipe mill include special forming unit solutions, rough forming pass solutions, fine forming pass solutions and comprehensive solutions. Let me introduce the solution to the difficult forming of thick-walled tube(1).
Analyzing the roll life of a used ERW tube mill
Analyzing the roll life of a used ERW tube mill
In the production of used ERW tube mills, the roll is the key and important special tool. Roll consumption is also a key tool for manipulating product costs. In addition, the normal operation of the roll will directly affect the output and quality of welded pipe manufacturing. Therefore, welded pipe manufacturers attach great importance to and strive to improve the service life of the roll.
Detail
In the production of used ERW tube mills, the roll is the key and important special tool. Roll consumption is also a key tool for manipulating product costs. In addition, the normal operation of the roll will directly affect the output and quality of welded pipe manufacturing. Therefore, welded pipe manufacturers attach great importance to and strive to improve the service life of the roll.
Contact information
Tel: +86-13392281699
Wechat: 13392281699
Email: zty@usedpipemill.com
Company address:No. A99, East Lecong Avenue, Lecong Town, Foshan City, Guangdong Province

Recommendation

Online Inquiry

留言应用名称:
底部留言
描述:

LINK

Contact Us

Tel (wechat): 13336487288
Wechat:+86 13336487288

WhatsApp:+86 13336487288
Email: zty@usedpipemill.com

Address: No. A99, Lecong Avenue East, Lecong Town, Foshan City, Guangdong Province

QRCODE

Copyright 0 2021 jinyujie. 粤ICP备13051810号 Powerby:  300.cn