Composite pipe spiral welding forming mode

Abstract

The invention discloses a continuous spiral welding compounding method for a composite pipe, and belongs to the technical field of rolling forming of bimetal continuous pipes. The method comprises a plate strip spiral rolling mechanism and a welding device. The device is characterized in that the two sets of spiral rolling systems can respectively form inner and outer metal pipes. The device has the advantages that two metal strips can be subjected to a rolling process, so that the inner-layer metal strip and the outer-layer metal strip are respectively subjected to continuous bending operation through a rolling device, the edge seams of the strips are welded by adopting a computer welding seam automatic tracking system, the bimetal composite pipe is prepared, large-batch production of continuous composite metal pipes is realized, and the production efficiency is improved. The bending radius and the motor power can be precisely designed according to the metal composite pipe of the production specification, parts of the whole mechanism are convenient to replace, the production efficiency of the metal composite pipe can be improved, and energy consumption can be reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of continuous forming of metal pipes, and in particular relates to a spiral welding forming method for a bimetallic composite pipe. Background Art

[0002] Bimetallic composite pipe is a pipe that effectively combines the excellent properties of both metals. As a new type of pipe material with superior performance, it is widely used in oil fields, chemical industry, electric power and other industrial fields, which helps to improve the technical level and competitiveness of the entire industry and is of great significance in promoting industrial upgrading and technological improvement. However, the main processing method of bimetallic composite pipe is segmented forming, which affects production efficiency. For longer-sized composite pipes, the single-tube butt welding method is used, which is prone to quality problems in the girth weld during use and poses safety hazards. This seriously restricts the development of the industry and brings great waste of resources and investment costs. Summary of the invention

[0003] The purpose of the present invention is to provide a continuous spiral composite method for bimetallic composite tubes, so as to realize mass production of continuous composite metal tubes, meet the requirement that metal is directly formed into a tube from a strip through a spiral tube winding process, reduce costs, ensure that the processed composite tube is round inside and outside, and has higher surface quality.

[0004] The implementation method of the present invention is as follows Figure 1 As shown, it includes (1) inner metal strip coil, (2) inner metal strip conveying device, (3) inner metal strip trimming device, (4) inner metal spiral roller bending device, (5) inner metal tube spiral welding device, (6) inner metal welded tube, (7) outer metal strip coil, (8) outer metal strip conveying device, (9) outer metal strip trimming device, (10) outer metal spiral roller bending device, (11) outer metal tube spiral welding device, (12) composite bimetallic welded tube. The present invention is characterized by:

[0005] ① In the first step, the inner metal strip coil (1) is fed into the spiral roller bending device (4) by the conveyor roller (2), so that the strip undergoes a spiral change around the rotary forming device under the action of the roller. After the metal strip tube is rotary formed, the inner metal tube spiral welding device (5) is used to weld the cut edges of the inner metal strip. The welded inner metal is fed into the next process under the action of the roller.

[0006] (② In the second step, the outer metal strip coil (7) is sent to the spiral roller bending device (10) by the conveying roller (8) through the trimming device (9), so that the outer metal strip is subjected to rotational deformation around the inner metal welded pipe (6) obtained by the first step of welding under the action of the roller. After the metal strip pipe is formed, the edge seam of the metal strip is aligned by two pairs of pressure rollers, and the edge seam of the outer metal strip is welded by the weld seam automatic tracking system (11). The welded double-layer metal composite pipe (12) is sent to the next process under the action of the conveying roller. The spacing between the inner metal layer and the outer metal layer should be greater than 5 mm to avoid affecting the inner pipe when the outer metal pipe is welded.

[0007] The advantages and positive effects of the present invention are that two kinds of metal strips can be subjected to a spiral rolling process, so that the inner and outer metal strips are respectively subjected to continuous bending operations through two sets of spiral devices, and a computer weld automatic tracking system is used to weld the side seams of the strips to prepare bimetallic composite pipes, thereby realizing mass production of continuous composite metal pipes. The roller diameter and motor power can be accurately designed according to the specifications of the metal composite pipes to be produced. The parts of the entire mechanism are easy to replace and the production line is short. The invention can improve the production efficiency of metal composite pipes and save energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 The figure is a simplified flow chart of the method of the present invention.

[0009] In the figure: (1) inner metal strip coil, (2) inner metal strip conveying device, (3) inner metal strip trimming device, (4) inner metal spiral roller bending device, (5) inner metal tube spiral welding device, (6) inner metal welded tube, (7) outer metal strip coil, (8) outer metal strip conveying device, (9) outer metal strip trimming device, (10) outer metal spiral roller bending device, (11) outer metal tube spiral welding device, (12) double metal welded tube DETAILED DESCRIPTION

[0010] like Figure 1 As shown, in the whole process, the inner metal coil (1) is firstly transferred by the transfer device (2) to the inner metal spiral rolling device (4), so that after the inner metal strip is subjected to the rolling process, it is controlled by certain parameters and rolled into a tube at a certain angle under the action of rolling, so that the inner and outer roundness of the tube can be ensured. Then, after the inner metal strip tube is formed by the inner metal weld seam visual recognition and tracking system (5), the side seams of the metal strip are precisely aligned and welded to obtain the inner metal spiral welded tube (6).

[0011] Then, the outer metal coil (7) is sent by the conveying device to the outer metal spiral rolling device (8), so that the outer metal strip is coated on the outer metal tube. The strip is processed into a tube through the rolling process, and then the outer metal strip tube is formed by the weld seam visual recognition and tracking system (11). Then, the metal strip edges are accurately butted and welded to obtain a double-layer metal welded tube composite structure (12), thereby preparing a finished composite tube.

Claims

1. A composite pipe continuous longitudinal rolling composite method, characterized in that: include: It includes (1) an inner metal strip coil, (2) an inner metal strip conveying device, (3) an inner metal strip trimming device, (4) an inner metal spiral roller bending device, (5) an inner metal tube spiral welding device, (6) an inner metal welded tube, (7) an outer metal strip coil, (8) an outer metal strip conveying device, (9) an outer metal strip trimming device, (10) an outer metal spiral roller bending device, (11) an outer metal tube spiral welding device, and (12) a composite bimetallic welded tube. The present invention is characterized in that firstly, the inner metal strip coil (1) is fed into the spiral roller bending device (4) by the conveying roller (2), so that the strip undergoes a spiral change around the rotary forming device under the action of the roller, and after the metal strip tube is rotary formed, the inner metal tube spiral welding device (5) is used to weld the trimmed edges of the inner metal strip. The welded inner metal is fed to the next process under the action of the rollers. In the second step, the outer metal strip coil (7) is fed into the spiral roller bending device (10) by the conveyor roller (8) through the trimming device (9), so that the outer metal strip is subjected to rotational deformation around the inner metal welded pipe (6) obtained by the first step of welding under the action of the rollers. After the metal strip pipe is formed, the edge seams of the metal strip are aligned by two pairs of rollers, and the edge seam of the outer metal strip is welded by the weld seam automatic tracking system (11). The welded double-layer metal composite pipe (12) is fed to the next process under the action of the conveyor rollers. The spacing between the inner metal and the outer metal should be greater than 5 mm to avoid affecting the inner pipe when the outer metal pipe is welded.

2. The continuous spiral welding composite forming method of a composite pipe according to claim 1, characterized in that The entire spiral rolling system will first complete the inner metal sheet strip into a tube, and then the outer metal sheet strip into a tube, to prepare a bimetallic continuous composite tube with a longer size, and the entire production forming process is shorter.

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