Core for rolling end of metal oil pipe

By improving the base and core rod structure, the bending problem of the core mold when processing small-diameter metal tubes was solved, achieving stable connection and wide applicability, and reducing production costs.

CN224525708UActive Publication Date: 2026-07-21HEBEI HUILONG HYDRAULIC EQUIP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
HEBEI HUILONG HYDRAULIC EQUIP CO LTD
Filing Date
2025-08-18
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing mandrels for rolling metal tubing ends are prone to bending and deformation when processing metal tubing with small diameters, resulting in a short service life. Furthermore, the non-standard distance between the convex rings affects product quality, and the support mandrel is easily damaged, leading to high operating costs.

Method used

The system employs a base and core rod structure, with the core rod and base connected by threads. A support core ring is located on the core rod, and a locking nut and a limiting plate are used for fixation, achieving a stable connection between the core rod and the base.

Benefits of technology

It extends the service life of the mandrel, adapts to the processing of metal tubes of different diameters and shapes, ensures consistent convex ring distance, and reduces production costs.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the core mould technical field discloses a kind of core mould for metal oil pipe end head calendering. Its main technical features are: including pedestal, the core rod of the pedestal front end diameter is smaller than the pedestal diameter, support core ring is set on the core rod at certain distance from the front end of the pedestal. When processing, metal pipe is sleeved on support core ring, the front end of metal pipe is topped in the junction of core rod and pedestal, pedestal is fixed on the rotary fixture of machine tool, in this way, the core rod of smaller diameter is shorter, in the transverse extrusion process of two press wheels, core rod is not easy to bend and deform, service life is prolonged, the front end of metal pipe is topped in the junction of core rod and pedestal, so that the convex ring formed by metal pipe is consistent with the distance of end part of metal pipe, and the core rod diameter is smaller, the metal pipe of smaller diameter can be processed, and the application range is wider.
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