Method and device for strengthening inner wall of middle-small diameter long tube through laser shot blasting

A technology of laser peening, medium and small diameter, applied in the direction of furnace type, furnace, heat treatment furnace, etc., can solve the problems of poor surface quality, uneven shot peening, and blocked feed movement, etc., to achieve good strengthening effect, uniform effect, high efficiency effect

Active Publication Date: 2013-02-06
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still deficiencies in this method: ①Due to the limitation of the size of the spray gun, it can only be applied to pipes with a diameter greater than 25 mm; ②The size of the spray gun support must match the inner diameter of the pipe. Replace accordingly; ③When the length of the pipe is too long, the feed movement of the pipe is blocked due to the soft material, resulting in uneven shot peening
However, there are still deficiencies in this device: ①The surface hardened layer after laser quenching is not uniform, and the surface quality is not high; ②The size of the robot device needs to be adjusted according to the inner diameter of the tube; ③The roller may be stuck by the inner wall during the crawling process of the robot device
Although the above meth

Method used

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  • Method and device for strengthening inner wall of middle-small diameter long tube through laser shot blasting
  • Method and device for strengthening inner wall of middle-small diameter long tube through laser shot blasting
  • Method and device for strengthening inner wall of middle-small diameter long tube through laser shot blasting

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Embodiment 1

[0033] Such as Figure 1-3 shown.

[0034] A method for strengthening the inner wall of a medium-small diameter long tube by laser shot peening, the specific steps of which are:

[0035]1) Select a copper pipe according to the inner diameter and length of the pipe fitting 4 to be strengthened, first coat a thin layer of transparent engine oil (10 μm) on the outer surface of the copper pipe, and then wrap a layer of flexible film for laser strengthening, so that the wrapped The diameter of the copper pipe with the film is slightly smaller than the diameter of the inner wall of the pipe fitting. Insert the copper pipe wrapped with the film into the inner wall of the pipe fitting 4, heat the copper pipe, and expand the flexible film to stick to the inner wall of the pipe fitting 4. After cooling, the copper pipe is separated from the film and pulled out. Copper pipe, this kind of flexible film can adopt the flexible film disclosed by the patent invention with publication number ...

Embodiment 2

[0044] Such as figure 1 shown.

[0045] A laser shot-peening strengthening device for the inner wall of a medium and small-diameter long tube, which includes a laser 1, a beam focusing system 2, a pipe fitting 4, a conical reflector 6 with a vertex angle of 90°, a conical reflector installation axis 7, a pipe fitting protective sleeve 8, a fixed Support 9, pipe fitting fixture 10, working platform 11, guide rail 12, motion control card 13, computer 14 and laser control card 15, pipe fitting 4 is fixed on the working platform 11 by pipe fitting fixture 10, and working platform 11 is connected with guide rail 12; The conical surface of the reflector 6 is coated with a metal reflective film, which is installed on one end of the conical reflector mounting shaft 7 extending into the pipe fitting 4, and the other end of the conical reflector mounting shaft 7 is fixedly installed on the fixed support 9, and the pipe fittings are protected. The sleeve 8 is installed on the end of the...

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Abstract

The invention relates to a method and device for strengthening inner wall of a middle-small diameter long tube through laser shot blasting. The method is characterized by comprising the steps of coating a reflecting film on the surface of a 90-degree taper reflector, reflecting a round laser beam into an annular shape through the taper reflector, and pasting a layer of flexible coated film on the inner wall of an enhanced tube to be strengthened. The central line of the laser beam, the central axis of the tube and the central axis of the 90-degree taper reflector are on the same line and parallel to a guide rail. The annular laser reflected by the reflector vertically irradiates the flexible coating film on the inner wall to produce plasma shock wave acting on the inner wall of the tube so as to form a residual compressive stress layer on the inner wall of the tube, so that the rigidity, corrosion resistance, wearability, fatigue strength and other performances of the inner wall of the tube are improved. The taper reflector moves from one end to the other end of the tube to realize a continuous strengthening process of the whole tube wall. The method and the device disclosed by the invention not only can be applied to tubes with middle-small diameters in a certain range, and continuous laser shot blasting can be realized for tubes with relatively longer length.

Description

technical field [0001] The invention relates to the field of laser processing, in particular to a technology for strengthening the inner wall of a pipe fitting, specifically a method and device for strengthening the inner wall of a medium-small-diameter long pipe by laser shot peening. Background technique [0002] In petroleum, chemical industry, natural gas, nuclear energy and other industries, pipe fittings are widely used. However, during the long-term use of pipe fittings, due to the corrosion of the external environment and the internal fluid medium, impurity wear, high pressure, etc., it will inevitably produce certain damage. Damage to rupture will cause serious consequences to production and safety. For example, the high-pressure fuel pipe of the diesel engine ruptures or leaks to the hot surface of the turbocharger due to high-pressure pulse load and high-frequency vibration, causing a fire at the machine; the steam pressure of the boiler pipe of the power station ...

Claims

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Application Information

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IPC IPC(8): C21D1/09C21D7/06C21D9/08C22F1/00C22F3/00
Inventor 黄舒季杏露周建忠陈寒松孟宪凯谢小江盛杰王宏宇
Owner JIANGSU UNIV
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