Slender pipe inner wall rotary extrusion strengthening device and strengthening method

Abstract

The invention belongs to the technical field of machining, and discloses a slender pipe inner wall rotary extrusion strengthening device and a strengthening method. The device comprises a guide rail which is provided with a first supporting seat, a second supporting seat and a third supporting seat in sequence, a sliding block installed in cooperation with the guide rail is fixed to the bottom ofthe third supporting seat, and the sliding block is connected with a feeding motor; the third supporting seat is provided with a supporting rod, and the supporting rod is connected with a rotating motor; and a to-be-machined pipe is clamped between the first supporting seat and the second supporting seat. During machining, firstly, the supporting rod penetrates into the to-be-machined pipe, and the front end of the supporting rod penetrates out of the to-be-machined pipe and is provided with a rolling tool; and then, the supporting rod is driven by the rotating motor to conduct high-speed rotary motion and driven by the feeding motor to retreat from the to-be-machined pipe at the same time, and the rolling tool completes rotary extrusion strengthening on the inner wall of the to-be-machined pipe under the tension-torsion effect. Thus, the occurrence of unstability is avoided, and the device has the advantages of improving the strengthening quality, reducing the labor intensity and improving the machining efficiency.

Description

technical field [0001] The invention belongs to the field of mechanical processing, and in particular relates to a strengthening device and a strengthening method for the inner wall of a slender tube. Background technique [0002] Fatigue damage, corrosion and wear are the most common failure mechanisms of seamless pipes during service, especially when cracks start from inner surface defects in fatigue failure. Therefore, at present, the surface strengthening technology of the inner wall of the pipe is mostly used to improve its performance to meet the requirements of use, including shot peening, laser shock, induction hardening, hole extrusion, etc. , but there are still some problems to be improved in these processing methods: [0003] 1. Most of the existing processing is limited to large-diameter round holes and pipe fittings with a relatively small length-to-diameter ratio, and there is no device and process for processing the inner wall of pipe fittings with a large l...

AI Technical Summary

Problems solved by technology

[0003] 1. Most of the existing processing is limited to large-diameter round holes and pipe fittings with a relatively small length-to-diameter ratio, and there is no device and process for processing the inner wall of pipe fittings with a large length-to-diameter ratio. The processing technology for deep and small holes needs to be developed ;

[0004] 2. For high-power lasers, the cost is expensive, and the laser shock strengthening connection hole processing process is complicated, and the process is not perfect, so it is particularly important to reduce processing costs and simplify devices;

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