MENU

/
/
The solution to the asymmetry of the open tube in the process of used welded pipe machine

The solution to the asymmetry of the open tube in the process of used welded pipe machine

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

【概要描述】There are various manifestations of tube asymmetry when used welded pipe machine is making tubes. The common ones are asymmetric bending arc at the edge of the tube blank, unequal edge height and tube asymmetric to the circle.

The solution to the asymmetry of the open tube in the process of used welded pipe machine

【概要描述】There are various manifestations of tube asymmetry when used welded pipe machine is making tubes. The common ones are asymmetric bending arc at the edge of the tube blank, unequal edge height and tube asymmetric to the circle.

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

There are various manifestations of tube asymmetry when used welded pipe machine is making tubes. The common ones are asymmetric bending arc at the edge of the tube blank, unequal edge height and tube asymmetric to the circle.

 

Asymmetrical curved edge

Causes and Effects:

(1) For the W deformation pass, edge deformation pass and double radius deformation pass, most of the reasons are improper operation of the first flat roll, insufficient pressure on the side of the tube with a large radius of curvature, or the upper roll is biased. The side with the smaller radius of curvature.

(2) For the circumferentially deformed pass, the problem may be that the roller axes are not parallel in a certain channel of the closed pass section, resulting in insufficient deformation of the tube blank on the side with a large roll gap.

(3) The upper roller of the closed hole type is deviated, and the force applied by the hole type to the two edges of the tube blank is not the same, resulting in different degrees of deformation on both sides.

(4) The feeding is in the middle, and the tube blank is always biased to the side with the larger radius of curvature.

 

Hazards of edge bending arc asymmetry. It is mainly manifested in hindering the parallel butt joint of the weld, easy to form high and low seams, dislocation of the weld, lap welding, and difficulty of the weld, thereby reducing the strength of the weld, affecting the removal of external burrs and the surface quality of the weld.

Adjustment measures: Simply put, it is correction. Correct the asymmetry of the hole type pressing, correct the asymmetry of the feed, and correct the imbalance of the pressing force.

 

Used welded pipe machine

 

The edge of the tube blank is not equal in height

Causes and hazards:

First, the reduction amount of the upper roll of the closed-pass final pass is insufficient, there is a gap between the edge of the tube blank and the guide ring, and the vertical roll before the pass deviates from the rolling center line; Level.

Adjustment measures: re-adjust the closed-hole type roll according to the process requirements and align the precision forming vertical roll.

 

The tube is asymmetrical to the circle

The forming tube is flat oval or vertical oval. Their common feature is that the tube shape is symmetrical in itself, but asymmetrical with respect to the circle.

 

The basic reason for the flat oval shape of the tube blank forming the used welded pipe machine is that the edge of the closed-hole flat roll is severely worn, and the more it is pressed, the more obvious the horizontal oval. It should be pointed out that the tube with thicker wall presents a little flat ellipse, which is not considered a defect, and is even the goal pursued by forming. language, then the decision is a defect that must be dealt with. From the perspective of production practice, the overly flat butt edge will increase the difficulty of removing external burrs.

 

 

Used welded pipe machine

 

There are three main adjustment measures:

(1) Properly lift the closed-hole type upper roller, and do not press it too tightly.

(2) Appropriately tighten the closed-hole front vertical roll to reduce the width of the tube blank entering the closed-hole type roll.

(3) Repair the hole pattern, which is the last resort for on-site adjustment of the welded pipe, and it is also a last resort.

 

The formation of the vertical elliptical tube is mainly due to the insufficient deformation of the tube in the "9 o'clock" direction and the "3 o'clock" direction in the rough forming roller, and the curvature radius of the tube blank at this part is large. A vertical oval tube will be formed. In addition, the forming machine with vertical roller group is also easy to form vertical oval tube.

 

In fact, the influence of the vertical elliptical tube on the forming and welding of the thin-walled tube is not obvious, but because its size in the vertical direction is too large relative to the opening size of the extrusion roller hole, when the tube blank enters the extrusion roller hole , It is easy to be bitten by the upper and lower edges of the extrusion roller hole.

 

Used welded pipe machine

 

The adjustment method is to strengthen the rolling of the third to fifth flat rolls in the rough forming, and at the same time appropriately increase the reduction of the closed-hole type rolls. For thin-walled tubes, it can be treated as a defect, or as long as the extrusion roll pass does not "bite the tube", or the opening of the extrusion roll pass can be properly opened. For thick-walled pipes, try to make them round to flat oval.

 

Through the analysis of the causes of flat elliptical and vertical elliptical tube blanks and their treatment process, some "defects" of welded pipe forming in used welded pipe machine are relative, the same pipe shape, for some pipe types Defects that must be dealt with are, for others, the goal of craftsmanship.

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).
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.
How to extend the service life of high frequency welded pipe equipment
How to extend the service life of high frequency welded pipe equipment
The service life of high frequency welded pipe equipment is of concern to everyone. The contribution made in the welding industry is immeasurable, and the care of it by customers should be paid more attention. So how can the service life of high frequency welded pipe equipment be extended in the actual production process?
Detail
The service life of high frequency welded pipe equipment is of concern to everyone. The contribution made in the welding industry is immeasurable, and the care of it by customers should be paid more attention. So how can the service life of high frequency welded pipe equipment be extended in the actual production process?
Adjusting the welding seam position of square and rectangular pipes made by directly forming to square pipe mill (2)
Adjusting the welding seam position of square and rectangular pipes made by directly forming to square pipe mill (2)
Judging that the quality of the square tube produced by the directly forming to square pipe mill meets the standard is based on a large number of inspection data of the microhardness of the weld and the microhardness of the base material. The former is much higher than the latter. It is for this reason that the weld is usually not placed at a positive angle, but placed within t~(t+5mm) from the corner edge to reduce the risk of weld cracks. This requires effective control of the weld position. Control methods include forming roll method, guide roll method and sizing roll method.
Detail
Judging that the quality of the square tube produced by the directly forming to square pipe mill meets the standard is based on a large number of inspection data of the microhardness of the weld and the microhardness of the base material. The former is much higher than the latter. It is for this reason that the weld is usually not placed at a positive angle, but placed within t~(t+5mm) from the corner edge to reduce the risk of weld cracks. This requires effective control of the weld position. Control methods include forming roll method, guide roll method and sizing roll method.
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