A precision machining method of a large-scale curved mold

By combining machine tool preheating procedures and hemispherical inserts with verification ring inspection methods, the precision machining problem of large curved surface molds was solved, achieving high-precision surface tolerance control and meeting the manufacturing requirements of aerospace parts.

CN115847025BActive Publication Date: 2026-07-03NANCHANG HUHANG IND CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANCHANG HUHANG IND CO LTD
Filing Date
2022-12-26
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

The precision control of large curved surface molds is difficult to achieve within ±0.05mm. It is greatly affected by the ambient temperature and the tool wear is difficult to judge, making it difficult to guarantee the machining accuracy of complex curved surface shapes.

Method used

A dedicated machine tool preheating program and hemispherical inserts are used, combined with a verification ring inspection method. The preheating program brings the machine tool to thermal equilibrium, the hemispherical inserts are used for finishing, and the tool wear is detected by the verification ring to ensure machining accuracy.

Benefits of technology

It achieves high-precision machining of large curved surface molds, meets the surface tolerance requirement of ±0.05mm, reduces the impact of ambient temperature and tool wear on precision, and ensures product quality.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention discloses a precision machining method for large curved surface molds. The steps are as follows: rough machining of the large curved surface mold on both sides using a CNC milling machine; allowing the large curved surface mold to stand freely in air; finishing machining the bottom plane of the mold in the free state; flipping the mold over and positioning it with the bottom plane, checking the flatness of the bottom plane of the mold body in the free state; preheating the machine tool to allow all moving parts of the CNC machine tool to reach thermal equilibrium in the machining area, thus ensuring stable operation of the machine tool; verifying changes in machine tool accuracy; machining the large curved surface of the mold using a hemispherical insert for finishing; and high-precision surface inspection of the machined large curved surface. The beneficial effects of this invention are: by using a preheating program to keep the spindle rotating and running the XYZ linkage idle for 1.5 to 2 hours, the CNC machine tool reaches thermal equilibrium; and by checking tool wear using a verification ring, the problem of tool wear judgment is effectively solved.
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Citation Information

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