Piston and machining technology thereof

Abstract

The invention discloses a machining technology of a piston. The technology comprises the following steps that 1) roughly grinding is carried out on an piston outer cylindrical working surface ; 2) anoil groove and a technology groove are lathed in the piston outer cylindrical working surface; 3) milling is carried out on a piston outer cylindrical face thoroughly; 4) finely grinding is carried out on the piston outer cylindrical working surface, the piston outer cylindrical face and the piston outer cylindrical face; and 5 ) the outer cylindrical face is lathed, positioning is carried out according to the inner cavity non-working face of the piston, the inner cavity non-working face of the piston is positioned through a positioning tool, and tight clamping points are arranged on the non-working face of the piston. According to the technology, the structure is mainly designed in cooperation with the machining technology of the invention, the structure is further improved at the same time, compared with a traditional structure, an oil tank 5 is additionally arranged, the oil tank 5 can be used for enhancing lubrication, the heat dissipation of the working face can be further accelerated, and thermal deformation can be reduced; and compared with the traditional structure, a technology groove 4 is additionally formed, so that the friction area is effectively reduced, and the efficiency is further improved.

Description

technical field [0001] The invention relates to the field of compressor processing, in particular. Background technique [0002] For the refrigeration compressors of fully enclosed refrigerators, it is hoped to improve the energy efficiency. The mechanical efficiency has reached more than 90% at present, and it is very difficult to further improve it. The traditional skirt piston design is as follows: figure 1 As shown, the outer cylindrical working surface 1 of the piston is a reciprocating friction surface. In order to reduce the transmission error, reduce the friction area, and improve the mechanical efficiency, after the piston is finely ground, a milling machine is used to mill out a skirt groove 2. However, in practical application of this structure, the mechanical efficiency is not improved, the dispersion is poor, and even the individual efficiency decreases. The main reason is that the processing technology is to fine-grind the outer cylindrical working surface 1 o...

AI Technical Summary

Problems solved by technology

However, the mechanical efficiency of this structure is not improved in practical application, the dispersion is poor, and even the individual efficiency decreases.

The main reason is that the processing technology is to fine-grind the outer cylindrical working surface 1 of the piston first and then use a special milling machine (because it is finished and then milled, the special milling machine equipment is very expensive, and a single imported equipment costs more than 1 million yuan. According to The beat needs 4 such devices, that is, more than RMB 4 million) to mill the skirt groove 2, because the milling skirt groove 2 is after finishing, during the clamping and processing process, on the piston outer cylindrical working surface 1, " Pinch, pinch, processing deformation, etc.", which makes the processing quality of the piston (even obvious bump, pinch, pinch phenomenon visible to the naked eye) and precision (cylindricity, roundness, roughness, etc. significantly decreased) drop significantly, The effect is not reflected, and even the loss of mechanical efficiency occurs in some cases

The reason why the skirt groove 2 is milled after fine grinding is because if the skirt groove 2 is milled first, and then the outer cylindrical working surface 1 of the piston is finely ground, the roundness and cylindricity of the outer cylindrical working surface 1 of the piston cannot be guaranteed , because after the skirt groove 2 is milled, the corresponding part of the piston outer cylindrical working surface 1 is not a complete circle, and its roundness cannot be guaranteed if it is finely ground

[0003] Therefore, after the traditional structure has been applied for a period of time, it has basically stopped being used because it did not achieve the expected effect.

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