Reducing rotary cold extrusion strengthening process device

Abstract

The invention provides a reducing rotary cold extrusion strengthening process device. The reducing rotary cold extrusion strengthening process device comprises a mandrel, as well as a lining and a fixed drum that are arranged on the mandrel in a sliding and sleeving manner and are fixedly connected with each other, wherein the lining consists of a plurality of fan-shaped lining blocks in circumferential arrangement; the other end of the fixed drum, away from the lining, is connected to a motor and a pipeline system; the mandrel comprises a conical cylinder and a constant-diameter cylinder; a conical through hole is formed in the lining; each fan-shaped lining block comprises a body and a lug boss; and spherical bulges in close and regular arrangement are formed on the outer surface of thebody. Owing to the spherical bulges in close arrangement on the surface of the lining, the fatigue life of a processed inner hole is favorably prolonged. The mandrel is designed into a conical cylinder, so that an adverse effect on the extrusion accuracy from abrasion of a square mandrel is avoided. Moreover, hole extrusion and the reaming process are combined to improve the degree of finish of the surface of the processed inner hole, so that the processing continuity is guaranteed, and the processing accuracy and the processing efficiency are improved.

Description

technical field [0001] The invention relates to the field of material strengthening, in particular to a cold extrusion strengthening process device. Background technique [0002] Fastening holes are typical stress concentration parts on aircraft components, and fatigue cracks are easily generated under the action of alternating loads, which will greatly reduce the safety, reliability and service life of the whole aircraft. Therefore, in design, material selection and manufacturing, how to reduce the influence of stress concentration in fastening holes as much as possible, improve the fatigue resistance of aircraft structures, prolong the service life, and ensure the reliability and safety of aircraft structures is an important aspect of design and material research. important research topics for researchers. [0003] In 1881, H.R. Hertz first studied the elastic deformation of glass lenses under the force that makes them contact each other. He hypothesizes: ① A small defor...

AI Technical Summary

Problems solved by technology

Compared with the traditional hole extrusion process, this extrusion method feeds the mandrel axially to expand the bushing radially to achieve the effect of hole extrusion strengthening. The residual stress distribution in the hole after processing by this process More uniform, however, the straight grooves between the four fan-shaped blocks will still form multiple ridges on the inner surface of the hole after processing, although the stress concentration level at the ridges is much lower than the stress level required for the crack initiation state, But it will affect the smoothness of the inner surface of the hole

And the bushing is composed of segmented sector bushing, which will easily cause eccentricity after certain wear and tear, which will affect the roundness of the hole

In addition, when the mandrel and the bushing slide relative to each other, it is easy to cause wear on the inner surface of the mandrel and the bushing

Images