Aviation piston core part structure and preparation method

Abstract

The invention discloses an aviation piston core part structure and a preparation method. The aviation piston core part structure comprises a piston shaft and a piston top, the piston top is fixed to the top end of the piston shaft, and a base is fixed to the bottom end of the piston shaft; the piston top is composed of a circular truncated cone portion and a circular cone portion fixed to the circular truncated cone portion, the circular truncated cone portion is fixedly connected with the top end of the piston shaft, and the top end of the circular cone portion is provided with an arc-shapedpushing end; a sealing ring B fixedly sleeves the outer portion of the position, near the piston top, of the piston shaft, and the outer portion of the piston shaft is further fixedly sleeved with a sealing ring assembly; the sealing ring assembly is composed of a plurality of sealing rings A arranged evenly at intervals, and the surface of the arc-shaped pushing end is provided with a chromium nitride film layer. According to the aviation piston core part structure, the surface roughness of the arc-shaped pushing end is improved to be within 0.1, the hardness of the arc-shaped pushing end isimproved to HV20-25Gpa at the same time, the surface roughness of the obtained aviation piston core part structure can be within 0.1, the surface abrasive resistance of the aviation piston core part structure is improved simultaneously, and the high required standard of an aviation piston core is met.

Description

technical field [0001] The invention relates to the technical field of manufacturing aviation piston core parts, in particular to an aviation piston core part structure and a preparation method. Background technique [0002] The aviation piston core part is an important part in the aerospace oxygen generation system. When working, the aviation piston core part will be set in a copper sleeve to make the piston move. The frequency of the piston movement is consistent with the pilot's breathing frequency. The aviation piston core part The front end will push another lever to move, because every time a pilot flies in the sky, this reciprocating action often has tens of thousands of times, so this part must be flexible. In order to ensure flexibility, it is necessary to increase the surface finish of aviation piston core parts to reduce friction with supporting parts, and the air tightness, friction resistance and wear resistance of existing aviation piston core parts are poor. ...

AI Technical Summary

Problems solved by technology

In order to ensure flexibility, it is necessary to increase the surface finish of aviation piston core parts to reduce friction with supporting parts, and the air tightness, friction resistance and wear resistance of existing aviation piston core parts are poor

With the continuous improvement of machining technology and equipment, customers have more and more stringent requirements on the appearance finish of aviation piston core parts. At present, the surface roughness of CNC machine tools, milling and cutting parts can generally reach 1.6, and grinding processing can reach 0.8 , the grinding can reach 0.2, the aviation piston core parts processed by the above method have a low service life, and the aviation piston core parts need to be replaced continuously, resulting in serious waste of materials and high maintenance costs

Images