Processing method for repairing chromium coating of undercarriage piston rod with unqualified air tightness
A processing method and a technology for a piston rod, which are applied in the processing field of repairing a chrome-plated layer of a landing gear piston rod with unqualified airtightness, can solve the problems of manpower consumption, material resources, scrapping of materials, etc., and achieve short repair time and low cost. , The effect of reducing product rework rate and scrap rate
Inactive Publication Date: 2011-12-21
BEIHANG UNIV
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Problems solved by technology
Chromium removal and repair consumes manpower and material resources, and the high-strength steel piston rod is easily scrapped due to repeated repairs
Method used
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[0056] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0057] see figure 1 , Figure 1A , Figure 1B , Figure 1C As shown, an ultrasonic elliptical vibration extrusion processing device based on dual excitation longitudinal bending elliptical transducers of the present invention includes a shell assembly 1 , a vibration assembly 2 , a sliding assembly 3 and a pressure assembly 4 .
[0058] 1. Shell components
[0059] see figure 1 , Figure 1A , figure 2 , Figure 2A , Figure 2B As shown, the housing assembly 1 includes a front cover 11 , a rear cover 12 and a base 13 .
[0060] The front cover 11 is provided with an X through hole 111 and an A through hole 112 , and the A through hole 112 is set at the center of the front cover 11 , and the A through hole 112 is used for the output end 21 a of the horn 21 to pass through. The X through hole 111 is arranged around the A through hole...
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Abstract
The invention discloses a processing method for repairing the chromium coating of an undercarriage piston rod with unqualified air tightness by using an ultrasonic longitudinal-bending elliptic device, which belongs to the treatment of material surface deformation. In the processing method, spherical diamond contacts with the surface of the chromium coating on the undercarriage piston rod, and the pulse impact rolling extrusion manner of the ultrasonic frequency generated by the ultrasonic longitudinal-bending elliptic device is used for sealing crack of the chromium coating so as to improve air tightness between the undercarriage piston rod and the outer cylinder. Through the method, plastic deformation can be generated on the chromium coating with depth of 0.5-4.5 mum so that the mesh cracks of the chromium coating in the depth range are sealed and gas is prevented from flowing out of the channel. Meanwhile, the extruded chromium coating surface has lower surface roughness and better surface smoothness, and the surface tightness of the chromium coating of the undercarriage piston rod is improved. The processing method disclosed by the invention is suitable for repairing the undercarriage piston rod which is unqualified by air tightness test or has reduced tightness after a period of use.
Description
technical field [0001] The invention relates to a repairing and processing method for coating materials, more particularly, a processing method for repairing a chrome-plated layer of a landing gear piston rod whose airtightness is unqualified by using an ultrasonic longitudinal bending ellipse device. The ultrasonic longitudinal bending ellipse device can be installed on ordinary lathes and CNC machine tools to perform pulse impact rolling extrusion processing on the chrome-plated layer on the piston rod of the landing gear. Background technique [0002] Aircraft landing gear is an indispensable device for aircraft takeoff and landing, and plays a very important role in the safety performance of the aircraft. The friction-bearing surface of aircraft landing gear is generally plated with hard chrome to reduce wear during use, and also to avoid rust due to long-term exposure and scratches in general. The phenomenon of "chrome layer sweating" during production and use, that is...
Claims
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IPC IPC(8): C25D5/48B23P6/00
Inventor 张德远秦威姜兴刚
Owner BEIHANG UNIV