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Copper pipe production method

A production method and technology of steel pipes, applied to the improvement of process efficiency, furnace type, furnace, etc., can solve the problems of plastic pipe wrinkles and affect the production quality of plastic-lined steel pipes, etc.

Active Publication Date: 2019-07-12
SHANGHAI BAOLUO STAINLESS STEEL TUBE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When producing plastic-lined steel pipes, it is necessary to coat a layer of hot melt adhesive on the outer wall of polyethylene pipes. The melting point of hot melt adhesive is 120°C, and the melting point of polyethylene is about 120°C to 125°C. Hot melt adhesive and The melting point and softening point of polyethylene are relatively close. Most of the existing plastic-lined steel pipes are produced by electromagnetic induction heating technology in the production process, but when the inner wall of the steel pipe is heated until the hot melt adhesive melts When the temperature is high, the polyethylene pipe will also soften due to heating, which makes the polyethylene pipe easy to flow due to pressure, so that wrinkles appear on the inner wall of the plastic pipe, which affects the production quality of the plastic-lined steel pipe.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: A method for producing steel pipes, including the following steps:

[0035] a. Material selection and shearing: select the appropriate steel according to the requirements of the steel pipe to be produced, and then roll the selected steel into coils by hot rolling, and then use the on-duty shearing machine to produce the steel according to the needs of the hot-rolled coils Cut the size to a suitable size;

[0036] b. Cold-rolling forming: the steel plate cut to the specified size is sent to the roll forming machine for coil rolling, and the steel strip is rolled 360° to form a rough steel pipe; in the process of coiling the steel strip with the roll forming machine Among them, the surface of the steel strip is sprayed with lubricating oil to prevent the surface of the steel strip from wrinkling due to high friction during the rolling process;

[0037] c. Degreasing: A large amount of lubricating oil is attached to the inner and outer surfaces of the rolled ste...

Embodiment 2

[0047] Embodiment 2: A method for producing steel pipes, including the following steps:

[0048] a. Material selection and shearing: select the appropriate steel according to the requirements of the steel pipe to be produced, and then roll the selected steel into coils by hot rolling, and then use the on-duty shearing machine to produce the steel according to the needs of the hot-rolled coils Cut the size to a suitable size;

[0049] b. Cold-rolling forming: the steel plate cut to the specified size is sent to the roll forming machine for coil rolling, and the steel strip is rolled 360° to form a rough steel pipe; in the process of coiling the steel strip with the roll forming machine Among them, the surface of the steel strip is sprayed with lubricating oil to prevent the surface of the steel strip from wrinkling due to high friction during the rolling process;

[0050] c. Degreasing: A large amount of lubricating oil is attached to the inner and outer surfaces of the rolled ste...

Embodiment 3

[0060] Embodiment 3: A method for producing steel pipes, including the following steps:

[0061] a. Material selection and shearing: select the appropriate steel according to the requirements of the steel pipe to be produced, and then roll the selected steel into coils by hot rolling, and then use the on-duty shearing machine to produce the steel according to the needs of the hot-rolled coils Cut the size to a suitable size;

[0062] b. Cold-rolling forming: the steel plate cut to the specified size is sent to the roll forming machine for coil rolling, and the steel strip is rolled 360° to form a rough steel pipe; in the process of coiling the steel strip with the roll forming machine Among them, the surface of the steel strip is sprayed with lubricating oil to prevent the surface of the steel strip from wrinkling due to high friction during the rolling process;

[0063] c. Degreasing: A large amount of lubricating oil is attached to the inner and outer surfaces of the rolled ste...

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PUM

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Abstract

The invention discloses a copper pipe production method and relates to the technical field of copper pipe production. The problem that the inner sides of plastic pipes in existing plastic-lined steelpipes are prone to being wrinkled is solved. The technical scheme of the steel pipe production method comprises the following steps including a, steel selection and shearing; b, cold rolling forming;c, pipe seam welding; d, weld seam treatment; e, weld seam detecting; f, heat treatment; g, hot melt adhesive coating; h, pipe pressurizing sealing; i, heating; and j, gas exhausting. When a steel pipe is heated, the inner wall of a polyethylene pipe is cooled in a water mist spray mode, accordingly, the inner wall of the polyethylene pipe is not prone to softening, accordingly, flowing is not prone to occurring, and therefore, the inner wall of the polyethylene pipe is not prone to being wrinkled.

Description

Technical field [0001] The invention relates to the technical field of steel pipe production, and more specifically, it relates to a steel pipe production method. Background technique [0002] Plastic-lined steel pipe is a kind of steel pipe. In the production of plastic-lined steel pipe, most of them are galvanized seamless steel pipe or welded steel pipe as the base pipe. After removing the welding ribs on the inner wall of the steel pipe, the inner wall of the steel pipe is lined with The food-grade polyethylene pipe with the same inner diameter as the steel pipe is then bonded to the inner wall of the steel pipe through pressure and heating after a certain period of time. The plastic-lined steel pipe is an upgraded product of the existing steel pipe. [0003] In the production of plastic-lined steel pipes, it is necessary to coat a layer of hot-melt adhesive on the outer wall of the polyethylene pipe. The melting point of the hot-melt adhesive is 120℃, and the melting point of ...

Claims

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Application Information

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IPC IPC(8): B21C37/08B29C65/52C21D9/08C21D1/42C23G1/08C23G3/04
CPCB21C37/08B29C65/52B29C66/032B29C66/5221B29C66/74283C21D1/42C21D9/08C23G1/088C23G3/04Y02P10/25
Inventor 余泽郭士荣
Owner SHANGHAI BAOLUO STAINLESS STEEL TUBE