MENU

/
/
Common surface defects of welded pipes in used welded pipe machine manufacturing - pipe surface scars

Common surface defects of welded pipes in used welded pipe machine manufacturing - pipe surface scars

  • Sort:Information
  • Auth:
  • Source:
  • Release time:2022-07-26 11:30
  • Pvs:

【概要描述】Pipe surface scars are common defects in the production of used welded pipe machine, with specific manifestations such as crushing, indentation and scratches.

Common surface defects of welded pipes in used welded pipe machine manufacturing - pipe surface scars

【概要描述】Pipe surface scars are common defects in the production of used welded pipe machine, with specific manifestations such as crushing, indentation and scratches.

  • Sort:Information
  • Auth:
  • Source:
  • Release time:2022-07-26 11:30
  • Pvs:
Detail

Pipe surface scars are common defects in the production of used welded pipe machine, with specific manifestations such as crushing, indentation and scratches.

 

① Crush injury

It refers to the damage of the roll pass to the surface of the tube blank, and there are many types of crush injuries, but the reasons for this are nothing more than the following aspects:

(1) The bottom line of a vertical roll pass is adjusted higher than the rolling bottom line; the entire rolling line has uneven undulations;

(2) The vertical roller is too tight;

(3) The vertical roller has an elevation angle;

(4) The new hole type may be that the edge chamfering of the hole type is too small or the chamfering angle does not meet the requirements;

(5) The high-strength tube blank has large springback and large deformation resistance, and the edge of the hole shape is easy to "bite" the tube blank;

(6) The vertical roller in front of the flat roller exerts insufficient lateral force on the tube blank, causing the wider tube blank to enter the flat roll pass with a fixed width, and the tube blank is "sheared" by the pass;

(7) The flat roll is too low, causing the tube blank to be crushed by the lower edge of the vertical roll pass;

(8) The vertical roll deviates from the rolling center line, causing the tube blank to be crushed in the flat roll.

 

Used welded pipe machine

 

② Indentation and dark lines:

The indentation and the dark line are actually the product of pressure injury, and the formation mechanism is roughly the same, but the performance is more hidden when the used welded pipe machine is used to make pipes. all exist.

 

The indentation usually appears as a 5~10mm reflective strip, which is especially obvious to the light source. The refractive index of the light at the indentation is different from that of other parts.

 

The essence of the dark line is that the linear scars that occurred earlier were not detected in time and were "flattened" by the subsequent rolling. At first glance, no fault can be seen; but after careful inspection, wiping with sandpaper, and scribing along the circumference of the tube surface with a fingernail, you can still see or feel the existence of dark lines. Dark lines are more subtle and harder to spot than indentations.

 

Used welded pipe machine

 

③ Scratches:

It mainly refers to the damage to the running tube blank by the rollers that do not move or the relative moving speed difference is large, and is characterized by the speed difference. For example, the bearing of the vertical roller is damaged, causing the rotation of the vertical roller to be blocked and scratching the surface of the tube; the linear speed of the rolling diameter position on the pass is different from the linear speed of other parts, and the position with a large speed difference is compared with the moving forming tube blank. There is a certain relative movement between them, and the surface of the tube will be scratched when the frictional force reaches a certain level. The scratch feature of the former is that there are vertical straight lines on the surface of the tube; the feature of the latter is that there is an irregular arc like a "nail print" on the surface of the tube. "Nailprints" mostly occur at the two edges, bottom and middle of the forming tube blank. The edge and bottom of the tube blank correspond to the position where the speed difference between the vertical rollers is the largest, and the middle corresponds to the position where the speed difference is the largest. .

 

Removing "nail marks" can be handled from two aspects: hole type and adjustment:

From the point of hole design, without affecting the overall deformation effect, bold removal of the hole is not only harmless to the molding, but also can never cause scratches.

 

Used welded pipe machine

 

From the perspective of adjusting used welded pipe machine, if there is an indentation under the tube blank of the vertical roll, lower the vertical roll; if there are indentations on both sides of the tube blank of the flat roll, tighten the vertical roll before the flat roll or properly Loosen the flat roll, if there is an indentation on one side of the tube blank after the flat roll, the center line of the vertical roll before the flat roll should be corrected.

关键词:

More News

The method of adjusting the concave surface when the galvanized pipe machine manufactures the square tube
The method of adjusting the concave surface when the galvanized pipe machine manufactures the square tube
When the galvanized pipe machines manufactures rectangular pipes, the pipe surface may be concave or convex. Concave surface classification is similar to convex surface.
Detail
When the galvanized pipe machines manufactures rectangular pipes, the pipe surface may be concave or convex. Concave surface classification is similar to convex surface.
Realize the overall heating treatment method of high frequency welded pipe equipment mechanism pipe welded pipe
Realize the overall heating treatment method of high frequency welded pipe equipment mechanism pipe welded pipe
The high frequency welded pipe equipment HFW welded steel pipe has been continuously developed with the competition with seamless steel pipe. For welded steel pipes to gradually replace seamless steel pipes, the key is to have high product quality and low production costs.
Detail
The high frequency welded pipe equipment HFW welded steel pipe has been continuously developed with the competition with seamless steel pipe. For welded steel pipes to gradually replace seamless steel pipes, the key is to have high product quality and low production costs.
On-line heat treatment method for high frequency welded pipe machine made pipe welds
On-line heat treatment method for high frequency welded pipe machine made pipe welds
The high frequency welded pipe machine HFW welded steel pipe has been continuously developed with the competition with seamless steel pipe. For welded steel pipes to gradually replace seamless steel pipes, the key is to have high product quality and low production costs. Nowadays, with the advancement of steel smelting technology, hot-rolled steel strip technology and pipe-making technology, as well as the extension of process technology to specialization, differentiation and conservation, all these have created the improvement of the quality of HFW welded pipes and the reduction of costs. condition.
Detail
The high frequency welded pipe machine HFW welded steel pipe has been continuously developed with the competition with seamless steel pipe. For welded steel pipes to gradually replace seamless steel pipes, the key is to have high product quality and low production costs. Nowadays, with the advancement of steel smelting technology, hot-rolled steel strip technology and pipe-making technology, as well as the extension of process technology to specialization, differentiation and conservation, all these have created the improvement of the quality of HFW welded pipes and the reduction of costs. condition.
High frequency welded pipe equipment to achieve seamless welded pipe
High frequency welded pipe equipment to achieve seamless welded pipe
The high frequency welded pipe equipment HFW welded steel pipe has been continuously developed with the competition with seamless steel pipe. For welded steel pipes to gradually replace seamless steel pipes, the key is to have high product quality and low production costs. Nowadays, with the advancement of steel smelting technology, hot-rolled steel strip technology and pipe-making technology, as well as the extension of process technology to specialization, differentiation and conservation, all these have created the improvement of the quality of HFW welded pipes and the reduction of costs. condition.
Detail
The high frequency welded pipe equipment HFW welded steel pipe has been continuously developed with the competition with seamless steel pipe. For welded steel pipes to gradually replace seamless steel pipes, the key is to have high product quality and low production costs. Nowadays, with the advancement of steel smelting technology, hot-rolled steel strip technology and pipe-making technology, as well as the extension of process technology to specialization, differentiation and conservation, all these have created the improvement of the quality of HFW welded pipes and the reduction of costs. condition.
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