A socketed bimetallic steel pipe forming device

By combining pneumatic expansion and infrared heating, the problem of requiring two processing steps in existing equipment has been solved, enabling continuous production of bimetallic steel pipes, avoiding thin-wall cracks, and improving processing efficiency and product quality.

CN122425131APending Publication Date: 2026-07-21SHANGHAI BAOMU PIPE FITTINGS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI BAOMU PIPE FITTINGS CO LTD
Filing Date
2026-04-21
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing socket-type bimetallic steel pipe forming equipment requires two separate processing steps, and the spigot processing can easily lead to the pipe wall being too thin or cracks appearing.

Method used

The device employs a pneumatic expansion assembly, a limiting assembly, a supplementary heating assembly, a displacement assembly, and a spigot forming assembly. The inner tube is clamped by a sealing head and a flaring roller. Heating and expansion are performed using an infrared heating tube and high-pressure gas. Combined with the limiting roller, the spigot is formed in a single continuous process.

Benefits of technology

This technology enables continuous processing of bimetallic steel pipes, reducing the number of operations required by workers, improving production efficiency, preventing excessively thin pipe walls or cracks, and increasing the product qualification rate.

✦ Generated by Eureka AI based on patent content.

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    Figure CN122425131A_ABST
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Abstract

The application relates to the technical field of double-metal steel pipe processing devices, in particular to a socket-type double-metal steel pipe forming device which comprises a first base, an air-pressure expansion assembly, a limiting assembly, a supplementary heating assembly, a second base, a displacement assembly and a socket forming assembly, the upper side of the first base is provided with the air-pressure expansion assembly, the air-pressure expansion assembly comprises a sealing head fixedly connected with the upper end face of the first base, in the application, the first infrared heating pipe, the second infrared heating pipe, the abutting block, the flaring roller and the limiting roller are arranged, the device can continuously process the pipeline, socket-type double-metal steel pipes can be quickly produced, and workers only need to carry out feeding and discharging once, so that time and labor are saved, the heating effect of the multiple second infrared heating pipes and the outer diameter limiting effect of the limiting roller can be used, the situation that the pipe wall is too thin or cracks appear when the pipeline expands can be effectively avoided, and the processing qualified rate of the product is improved.
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