Forging and pressing piston as well as processing method thereof

Abstract

The invention discloses a forging and pressing piston as well as a processing method thereof. The piston comprises a piston top part, a head part and a skirt part; the piston top part is a concave top; the head part is provided with three ring grooves; a V-shaped oil groove is formed between the first ring groove and the second ring groove; a side-view structure formed by the skirt part and the head part is T-shaped; a pin base is connected with the top part and the skirt part through a short shaft surface; a weight-reducing cavity is formed between the outer side of the pin base and the top part; the width of the skirt part is 38 to 42 percent of the diameter of the piston head part; the height of the skirt part is 65 to 68 percent of the height of the piston; the lower end of the short shaft surface adopts an arch structure; the processing method is to process and manufacture by an anti-stamping forging and pressing mode; and compared with the existing traditional piston for racing bicycles, the forging and pressing piston has the characteristics of high strength, small weight and reasonable structural design.

Description

technical field [0001] The invention relates to the technical field of engine pistons, in particular to a forged piston used in racing cars and a processing method thereof. Background technique [0002] The piston is a key part of the engine, and it has been working under alternating high temperature, high pressure and impact load conditions for a long time. The performance of the piston directly affects the performance and safety factor of the entire engine. Most of the pistons are now cast pistons, and both gravity casting and pressure casting will produce defects such as shrinkage porosity and pores. Even if squeeze casting is used, the generation of oxide inclusions and small pores cannot be avoided. [0003] For the engine, the explosion pressure has been increasing, and the piston, which is the core component, directly bears the explosion pressure in the engine. The actual measurement of the tensile strength of the traditional piston is ≥119MPa. The cast piston has a l...

AI Technical Summary

Problems solved by technology

[0003] For the engine, the explosion pressure has been increasing, and the piston, which is the core component, directly bears the explosion pressure in the engine. The actual measurement of the tensile strength of the traditional piston is ≥119MPa. The cast piston has a large inertia force due to its heavy weight. The additional impact on the piston pin and connecting rod increases the risk of breaking the piston pin and connecting rod, and also brings the risk of deformation to the piston itself; the conventional racing piston head is designed with a three-ring groove structure, the first There is a problem of uneven force on the first piston ring, and excessive local force may easily cause the risk of piston ring fracture

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