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Process for preparing seamless composite metal pipe

A metal composite pipe and composite pipe technology, applied in the field of metal pipe processing, can solve the problems of single product specification, expensive welding equipment, complicated preparation process, etc., and achieve the effects of high appearance finish, shortened processing time, and simple preparation method

Inactive Publication Date: 2002-05-01
亓登利
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, practice has proved that there are many deficiencies in this preparation technology: one is that the welding equipment is expensive and the production cost is relatively high; The seam is obvious, and the weld on the inner wall of the pipe is easy to scale, which affects the velocity of the fluid in the pipe; the fourth is that the product specification is single and the preparation process is complicated
However, the main disadvantage of this preparation method is that the inner wall tube is not annealed before the cold extrusion technology equipment is used for drawing treatment, and the cold extrusion drawing is performed before the original steel strength and toughness of the inner wall tube are not changed. Therefore, it will affect the quality of drawing and compounding, and the compounding tightness of the compound pipe will be relatively poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation method of stainless steel outer composite pipe: stainless steel outer composite pipe, carbon steel pipe with an outer diameter of 21mm and a pipe wall thickness of 2mm is used as the inner wall pipe; a stainless steel thin-walled pipe with an outer diameter of 22mm and a pipe wall thickness of 0.4mm is used as the outer composite tube, the steps of its manufacturing method comprising:

[0027] 1. Annealing, the carbon steel pipe used for the inner wall pipe is annealed at high temperature and cooled naturally;

[0028] 2. Cleaning, cleaning the carbon steel pipe and stainless steel thin-walled pipe used for the inner wall pipe after annealing treatment as the outer multiple pipe;

[0029] 3. Fitting, the annealed inner wall tube is inserted into the stainless steel seamless outer cladding tube to form a composite tube billet;

[0030] 4. Expand the tube. Open a hole with a length of about 15cm at one end of the composite tube blank, install the tube blank o...

Embodiment 2

[0034] The preparation method of the copper composite pipe: the copper composite pipe, the ordinary carbon steel pipe with an outer diameter of 15mm and a pipe wall thickness of 2mm is used as the outer pipe, and a copper pipe with an outer diameter of 10.8mm and a pipe wall thickness of 0.4mm is used as the inner wall pipe , the steps of its preparation method include:

[0035] 1. Annealing, the copper tube used for the inner wall tube is annealed at high temperature and cooled naturally;

[0036] 2. Cleaning, cleaning the copper tube used for the inner wall tube after annealing treatment and the ordinary carbon steel tube used for the outer multiple tube;

[0037] 3. Fitting, the annealed inner wall tube is penetrated into the outer cladding tube of the ordinary carbon steel pipe and the inner sleeve is synthesized into a composite tube blank;

[0038] 4. Expand the tube. Open a hole with a length of about 10cm at one end of the composite tube blank, install the tube blank ...

Embodiment 3

[0042] The preparation method of the multi-layer metal composite pipe: the multi-layer metal composite pipe is made of a stainless steel thin-walled pipe with an outer diameter of 25mm and a pipe wall thickness of 0.5mm as the outer cladding pipe, and an ordinary pipe with an outer diameter of 23.8mm and a pipe wall thickness of 1mm is selected. The carbon steel welded pipe is the middle layer metal pipe; the copper pipe with an outer diameter of 21.6mm and a pipe wall thickness of 0.4mm is selected as the inner wall pipe. Its manufacturing method is roughly the same as the method of manufacturing copper composite pipe, the difference is that one more layer of metal is added, and an expansion and drawing process is added. The compounding of the middle layer metal pipe and the outer cladding pipe is carried out first, and then the compounding with the inner wall pipe is carried out. Specific steps include:

[0043] 1. Annealing, high-temperature annealing of the copper tube us...

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Abstract

A method for manufacturing seamless composite metal pipe includes high-temp anealing and natural cooling of internal pipe, washing the internal and external pipes, inserting internal pipe in external pipe, mounting the blank to mandrel of pipe drawer, installing inner mould, drawing, sleeving outer mould on it, pulling-down, straightening and cutting. Its advantages are high strength, easy machining, low cost, high quality and high smooth finish.

Description

technical field [0001] The invention relates to a metal pipe processing technology, in particular to a preparation technology of a seamless metal composite pipe. Background technique [0002] Metal composite pipes are widely used due to their excellent properties that ordinary metal single pipes do not have. At present, the preparation methods of metal composite pipes, except that two kinds of metal plates are processed into metal composite plates, rolled into tubes and welded into pipes, most of them are produced by cold bending and welding cladding processes. However, practice has proved that there are many deficiencies in this preparation technology: one is that the welding equipment is expensive and the production cost is relatively high; The seam is obvious, and the weld seam on the inner wall of the pipe is easy to scale, which affects the velocity of the fluid in the pipe; the fourth is that the product specification is single and the preparation process is complicat...

Claims

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Application Information

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IPC IPC(8): B21C1/24B21C37/06
Inventor 亓登利
Owner 亓登利
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