Tube expanding and flaring device

By using elastic elements and limiting structures in the tube expansion and flaring device, combined with a multi-stage curved expansion head design, the problems of expansion cracking and uneven flaring caused by stress concentration in existing devices are solved, achieving a high-quality and efficient flaring process for tubular workpieces.

CN224475511UActive Publication Date: 2026-07-10HISENSE (SHANDONG) AIR CONDITIONING CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
HISENSE (SHANDONG) AIR CONDITIONING CO LTD
Filing Date
2025-06-09
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing tube expansion and flaring devices, when flaring tubular workpieces, may cause stress concentration or uneven flaring due to excessive or insufficient single impact force, which can easily lead to cracking of the tubular workpiece or insufficient flaring, affecting the flaring quality and efficiency.

Method used

The tube flaring device, which adopts the design of elastic elements and limiting structures, transforms instantaneous impact loads into gradual loading through elastic elements, resulting in uniform stress distribution. The limiting structure prevents the flaring head from detaching. Combined with the multi-stage curved flaring head design, it achieves gradual flaring and precise forming.

Benefits of technology

It effectively avoids the problems of cracking and uneven flaring of tubular workpieces, ensures flaring quality and dimensional stability, and improves processing efficiency and flaring accuracy.

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Abstract

This application provides a tube expansion and flaring device, including a base, a sleeve, an expansion head, and an elastic element. The base is used to fix the tube expansion machine. The sleeve has a hollow inner cavity, and the first end of the sleeve is detachably installed on the base. The expansion head is movably installed at the second end of the sleeve along the length direction of the sleeve. Part of the structure of the expansion head is located in the hollow inner cavity of the sleeve. The expansion head is used to flare the end of the tubular workpiece. The elastic element is disposed in the hollow inner cavity of the sleeve. One end of the elastic element abuts against the base, and the other end abuts against the expansion head. When the expansion head abuts against the end of the tubular workpiece, the elastic element is used to provide an elastic force to the expansion head to move toward the tubular workpiece. During the flaring process of the tubular workpiece, the elastic element can convert the instantaneous impact load into a gradual loading, effectively homogenize the stress distribution, and avoid the tubular workpiece from cracking due to stress concentration.
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