Manufacturing method for pipe members

By treating a plate material with predetermined irregularities and bending it into a pipe shape using breakdown rolls with varying hardness, the method addresses the challenge of creating functional inner surfaces in pipe members, ensuring effective powder adhesion suppression and water repellency.

JP7868815B1Active Publication Date: 2026-06-02SHINNICHI IND +1
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
SHINNICHI IND
Filing Date
2025-10-28
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing methods struggle to create predetermined irregularities on the inner surface of pipe members used for transporting powder or liquid, as surface treatment devices cannot be easily inserted or moved within the pipe, limiting the application of desired surface treatments.

Method used

A method involving a plate material with predetermined irregularities is prepared through surface treatment, then bent into an arc shape with the treated surface facing inward, and joined to form a pipe member using breakdown rolls with varying material hardness to facilitate treatment without restricting device movement.

Benefits of technology

This approach allows for the easy manufacture of pipe members with inner surfaces featuring predetermined irregularities, enhancing functions such as powder adhesion suppression and water repellency by maintaining irregularity integrity during the manufacturing process.

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    Figure 0007868815000001_ABST
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Abstract

To easily manufacture pipe members having an inner surface with predetermined irregularities. [Solution] The manufacturing method for the pipe member P involves preparing a plate material S on which a predetermined unevenness is provided on the surface S1 by surface treatment, bringing the outer circumferential surface of a convex breakdown roll 31 into contact with the surface S1, bending the plate material S into an arc shape with the surface S1 facing inward, and joining the ends of the plate material S together, wherein at least a portion of the outer circumferential surface of the convex breakdown roll 31 is formed of a material softer than the plate material S.
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