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Method for producing multiple metal composite pipe

A technology of metal composite pipe and manufacturing method, which is applied in the field of steel pipe processing, can solve the problems of narrow application range, small specification range, and high price, and achieve the effects of expanded application range, good surface quality, and low equipment investment

Inactive Publication Date: 2004-02-25
杨宝森 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 2. The weld seam of the outer stainless steel welded pipe is obvious, visual inspection and hand feeling are more obvious, the surface quality is uneven, and the surface defects of the carbon steel welded pipe cannot be removed, which should be reflected on the surface of the composite pipe
[0008] 3. Only stainless steel outer composite pipes can be produced (that is, stainless steel outside and carbon steel inside), and inner composite pipes including stainless steel and composite pipes made of other metals cannot be produced. The product variety is single
Moreover, carbon steel pipes can only use plain carbon steel welded pipes, not seamless pipes and high-grade steel pipes, so they can only be used in decoration and building structures, and the application range is narrow, requiring high-performance boiler pipes, high-grade Strength pipes, oil pipes, corrosion-resistant pipes, etc. cannot be produced
[0009] 4. The product specifications are limited by the capacity of the unit, and the specification range is small. For example, a 2-inch unit can only produce composite pipes with an outer diameter of 50.8mm. If you want to expand the specification range, you need to increase the equipment capacity. If you want to produce Φ12~Φ159mm outer diameter Composite pipes require three sets of composite pipe production units of 2 inches, 3 inches and 6 inches. The equipment is expensive, and the equipment investment of three units requires more than 10 million US dollars.
[0010] 5. In addition, due to the different welding techniques of carbon steel welded pipe and stainless steel in this process technology, the welding speed is different (carbon steel is fast, stainless steel is slow), the process is difficult to master, and it is difficult to reach the designed production capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1. Manufacturing method of stainless steel outer composite pipe.

[0058]The stainless steel outer composite pipe is a multi-metal composite pipe with carbon steel pipe as the base pipe and stainless steel thin-walled welded pipe as the outer composite pipe. The steps of its manufacturing method include:

[0059] 1. Choose carbon steel pipe as the base pipe, not only welded pipe, but also seamless pipe, which can be self-made or purchased in the market; choose stainless steel thin-walled welded pipe as the outer cladding pipe.

[0060] 2. The finishing process of carbon steel pipes includes: starting - drawing and reducing - straightening - removing surface oil.

[0061] (1) the beginning

[0062] The purpose of starting the head is to make the end of the steel pipe form an inverted trumpet shape, and the front end gradually shrinks, so that the head extends out of the drawing die for drawing and reducing the diameter of the steel pipe during the next drawin...

Embodiment 2

[0091] Embodiment 2. The manufacturing method of composite pipe in stainless steel.

[0092] The stainless steel inner composite pipe is formed by compounding the thin-walled (0.2mm ~ 0.5mm) stainless steel welded pipe on the inner wall of the steel pipe.

[0093] The production of the stainless steel inner composite pipe is also to make the inner layer pipe and the outer base pipe respectively, and then put them together, and draw them with the core mold and the outer mold to make the two layers of metal tightly bonded together to form a composite pipe.

[0094] In this technology, the inner and outer two-layer pipes of the inner composite pipe: carbon steel pipe and stainless steel thin-walled pipe. Like the outer composite pipe, the carbon steel pipe is mainly purchased from outside, and the stainless steel thin-walled pipe is self-made.

[0095] Carbon steel pipes generally use galvanized welded pipes (whichever has anti-corrosion properties), and carbon steel welded pipes...

Embodiment 3

[0107] Embodiment 3. Copper composite pipe

[0108] Copper composite pipes also have two types of composite pipes: external cladding and internal cladding. From the perspective of use requirements and cost reduction, the thickness of the copper layer is only 0.3-0.5mm. If the user requires it, the copper layer larger than 0.5mm can also be clad.

[0109] Copper tubes generally use copper tubes, which are purchased or self-made. Since thin-walled (0.3-0.5mm) copper tubes with a diameter of more than 30mm are difficult to produce (because most copper tubes on the market are produced by extrusion process, which cannot produce large-scale thin-walled copper tubes), they cannot be bought in the market. But thin strips can be bought, and the manufacturing method of the stainless steel thin-walled welded pipe that above-mentioned external cladding process is used also can produce the thin-walled welded pipe of copper and titanium. Therefore, the copper thin-walled tube is self-made....

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Abstract

Multiple metal composite pipe is manufactured through the steps of: selecting the materials for base pipe and coating pipe separately, manufacturing and trimming base pipe, manufacturing and trimming coating pipe, casing the coating pipe onto base pipe to constitute composite pipe blank, combining the two metal pipe closely with a drawing machine, straightening, end cutting, burring, and polishing. The composite pipe of the present invention has high strength, welding and bending machinability, high outer quality and other advantages. The method of the present invention may be used in producing various composite pipe.

Description

Technical field: [0001] The invention relates to a steel pipe processing technology, in particular to a method for manufacturing a metal composite pipe of a steel pipe. Background technique: [0002] There are currently two methods of manufacturing metal composite pipes. One is that two metal plates are processed into composite plates by pressure, and the tubes are formed by a plate rolling machine and welded into tubes; the other is cold-formed cladding welding. Foreign (mainly Japan, South Korea, etc.) existing stainless steel composite pipes (outer composite pipes made of carbon steel pipes covered with stainless steel) are mainly produced by cold-formed clad welding processes. [0003] The main idea of ​​this process technology is to make carbon steel welded pipe (the first unit) first by using the cold bending forming process technology, then use the carbon steel welded pipe as the center, use the second cold forming unit to input stainless steel belt and wrap it on the...

Claims

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Application Information

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IPC IPC(8): B21C37/06
Inventor 杨宝森罗亚丽
Owner 杨宝森