Processing technology of engine shell and spinning tool clamp

By using a seamless integrated processing technology for tube blanks, combined with short mandrels and dual-axis synchronous rotation technology, the problems of low material utilization and long production cycle of large-size combustion chamber shells have been solved, achieving high-precision, low-cost seamless integral forming, which is suitable for small-batch production of aerospace products.

CN122007829BActive Publication Date: 2026-06-19ZHEJIANG HUAXUAN SPECIAL EQUIP CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG HUAXUAN SPECIAL EQUIP CO LTD
Filing Date
2026-04-09
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Traditional segmented welding and conventional spinning processes for manufacturing large-size combustion chamber shells suffer from low material utilization, weld defects, high mold costs, poor dimensional accuracy, and long production cycles, making it difficult to meet the needs of small-batch, multi-variety development.

Method used

The process employs an integrated seamless forming technology for tube blanks. Through steps such as spinning and sealing, thickening, necking, and thinning, combined with short mandrel, axial tension, and dual-axis synchronous rotation technology, seamless integral forming is achieved. Heat treatment is performed using a CNC double-rotor spinning machine and a vacuum quenching furnace, and residual stress is eliminated by vibration aging technology.

Benefits of technology

Significantly improves material utilization, reduces raw material costs, shortens production cycles, ensures high product precision and structural strength, adapts to small-batch development needs, avoids welding defects, and improves product roundness and straightness.

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Abstract

This invention discloses a processing technology and spinning fixture for engine housings, belonging to the field of engine housing manufacturing technology. The processing technology includes spinning sealing, precision turning, spinning thickening, spinning necking, spheroidizing annealing, two-pass thinning spinning, stress-relieving heat treatment, vacuum conditioning, correction, and final precision turning. It employs a short mandrel, synchronous rotation of dual spindles, and axial tension to suppress forming defects, combined with graded heat treatment to eliminate residual stress and improve plasticity. The spinning fixture includes a short mandrel, a cap, an extension rod, and an adapter plate. The short mandrel is assembled from sector-shaped blocks and positioned by a frustum-shaped central axis, facilitating easy assembly and disassembly. This invention solves the problems of high cost, numerous defects, large residual stress, and low precision associated with traditional ultra-long mandrels, achieving high-precision, low-stress, and high-efficiency forming of the housing, suitable for the mass production of ultra-high-strength steel thin-walled engine housings.
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Citation Information

Patent Citations

  • Internal spinning device

    CN109382435A

  • Method of producing thin-wall shells

    RU2426617C1