Multi-pass spinning forming method for long barrel with inner annular reinforcing ribs

Abstract

The invention belongs to the technical field of spinning forming, and discloses a multi-pass spinning forming method for a long barrel with inner annular reinforcing ribs. An inner spinning technologyand a tension spinning technology are combined, only a set of annular core dies with different inner diameter sizes and the length being 400 mm are adopted to achieve multi-die multi-pass spinning forming of the long barrel part with the multiple inner annular reinforcing ribs and the length being 2m or less, and the part reinforcing rib position and size precision can be ensured. The method comprises the steps of spinning workblank design, spinning workblank machining, stress relief treatment, workblank installation adjusting, multi-pass spinning, turning, stress relief treatment and the like. Multi-pass low-cost forming of the long barrel with the inner annular reinforcing ribs is achieved, and the material utilization rate is greatly improved; and compared with a traditional technology, the technological risk and the difficulty of multi-pass accurate forming of the inner annular reinforcing ribs are lowered, the material cost is reduced, and the product quality is improved.

Description

technical field [0001] The invention relates to a multi-pass spinning forming method for a long cylindrical body with inner circumferential reinforcing ribs, and belongs to the technical field of spinning forming. Background technique [0002] External spinning is a traditional spinning process technology. The external spinning technology can produce long-length cylindrical rotary parts with external reinforcing ribs. It has high efficiency, can be heated for spinning, and can process curved generatrix shapes. And tapered parts and other characteristics. However, the length of the external spinning die is required to be longer than the length of the product, which is difficult to manufacture, low in assembly accuracy, and high in production costs. Most importantly, products with inner circumferential ribs formed by the external powerful spinning process must be split The mold must be disassembled and assembled again for each product produced. The production efficiency is ex...

AI Technical Summary

Problems solved by technology

However, the mold length of the internal spinning technology is required to be longer than the product length, which is difficult to manufacture, low in assembly accuracy, and high in production costs. Most importantly, this process can only produce products with a length of less than 1m. If the product is too long, the workpiece If the contact area between the outer surface and the mold is too large, the friction force is large, and the workpiece will not be released from the mold, so it cannot be applied to the production of large-diameter and high-precision long cylindrical parts required by industrial development.

[0004] Tension internal spinning is an advanced forming method, but the existing method only supports single mold and single pass spinning, the material utilization rate is low, and the production cost is high

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