A spray gun and strengthening method for shot peening strengthening blind holes with large length-to-diameter ratio
A large aspect ratio, shot peening technology, applied in the direction of spray guns, metal processing equipment, manufacturing tools, etc., can solve problems such as shot peening projectile blockage, and achieve the goal of solving projectile blockage, eliminating fatigue stress concentration, and improving fatigue resistance. Effect
Active Publication Date: 2019-03-01
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology
[0005] The purpose of the present invention is: to propose a spray gun and strengthening method suitable for shot peening of large aspect ratio blind holes of aviation parts, so as to solve the difficult problem that the shot peening of large aspect ratio blind holes of aviation parts is easily blocked by projectiles, and meet the requirements of aviation parts. The need to eliminate fatigue stress concentration and improve fatigue resistance
Method used
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[0021] The semi-cone angle of the circular table surface of the gun head 4 is α=45°; the included angle between the axis of the inclined tube 1 and the axis of the inner tube 1 is 30°.
[0022] The method for strengthening the blind hole with a large aspect ratio using the spray gun as described above is characterized in that the steps of strengthening are as follows:
[0023] 1. Install the spray gun: connect the outer cylinder 5 of the spray gun to the spear gun rod 8 of the shot blasting equipment through threads, and connect the inclined tube 6 of the spray gun to the projectile recovery device 10 through a clamp; insert the outer tube 2 of the spray gun into the blind hole 9, the lower end surface of the outer tube 2 is 3 mm from the bottom of the blind hole 9;
[0024] 2. Shot peening: open the shot recovery device 10, turn on the shot peening equipment, the nozzle 3 sprays projectiles, the diameter of the projectile is 0.15mm, the flow rate of the projectile is 0.5kg / mi...
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Abstract
The invention belongs to a part surface treatment technology, and relates to a spraying gun and a strengthening method for shot peening strengthening a blind hole with the large length-diameter ratio.The spraying gun comprises an inner pipe (1), an outer pipe (2), a gun head (4), an outer cylinder (5), an oblique pipe (6) and a connecting cylinder (7). The strengthening method comprises the stepsthat the spraying gun is mounted; and shot peening strengthening is conducted. According to the spraying gun and the strengthening method for shot peening strengthening the blind hole with the largelength-diameter ratio, the problem that the blind hole with the large length-diameter ratio of an aeronautical part is prone to being blocked by shots in the shot peening process is solved, and thus the requirements for eliminating fatigue and concentrating stress and improving the anti-fatigue property of the aeronautical part are met.
Description
technical field [0001] The invention belongs to a component surface treatment technology, and relates to a spray gun and a strengthening method suitable for shot peening strengthening of large-length-diameter ratio blind holes of aviation components. Background technique [0002] Long life and high reliability are the eternal pursuit goals of aviation key components. Key aviation parts are usually subjected to alternating loads such as force and heat, and are prone to fatigue damage, which not only leads to premature scrapping of service parts within the validity period, but also poses a serious threat to flight safety. According to statistics, the damage caused by the early fatigue failure of products in Europe reaches 80 billion euros every year, 95% of which are due to fracture damage caused by fatigue. In order to prevent fatigue failure of key parts and improve the fatigue resistance of parts, shot peening technology is often used at home and abroad to treat the surfac...
Claims
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IPC IPC(8): B24C5/02B24C1/10
Inventor 罗学昆艾莹珺汤智慧王欣宋颖刚王强
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS