Optimal injection process for piston lip

Abstract

The invention discloses an optimal injection process for a piston lip. The optimal injection process comprises the following steps: (1) optimization of piston components; (2) inspection of raw materials; (3) storage of incoming materials; (4) phosphating of metal materials: refining manganese, magnesium and lead in the raw materials respectively, proportionally adding the refined manganese, magnesium and lead into a phosphating solution for soaking for 20- / +3 minutes; (5) injection and pressure maintenance, wherein the plasticizing temperature is 60 DEG C, the temperature of an injection cylinder is 70 DEG C, the injection pressure is 120 to 130 bar, the holding pressure is 150 to 190 bar, the holding time is 3 to 7s, the ejection position of a thimble is 310 to 330mm, the ejection speed of the thimble is 150 to 190mm / s, the first-segment sulfurizing temperature is 190- / +5 DEG C, and the first-segment sulfurizing time is 90s; (6) cooling; (7) trimming; (8) second-segment sulfurizing atthe temperature of 185 DEG C for 3 hours; (9) airtight test; (10) final inspection, packaging and finished product storage. By adopting the optimal injection process, the product can keep the shape in a mold cavity during the de-molding process, the size stability of the lip is improved, and the airtightness of a piston is improved.

Description

technical field [0001] The invention belongs to the technical field of seal processing, in particular to an injection process for optimizing piston lip. Background technique [0002] As people pay more and more attention to environmental issues, the requirements for the performance of internal combustion engines are also increasing: high power, low fuel consumption, low noise, low emissions, etc. As the piston is an important core component of the internal combustion engine, the quality of its performance becomes particularly important. [0003] Chinese patent CN 108176956 A discloses "a piston processing technology", which includes the following steps: a, material cutting; b, stretching; c, flat bottom; d, pre-bending; e, flat head; f, car end face; g , rolling groove; h, turning, turning the outer circle of the blank; l, rough grinding of the outer circle, rough machining of the outer circle by the grinding machine; j, semi-finishing; k, fine grinding; l, degreasing; m, h...

AI Technical Summary

Problems solved by technology

[0004] However, there are still some deficiencies in the existing piston processing technology, especially for the piston with a lip, it is extremely easy to have a small lip size during demoulding, which leads to the leakage of the piston during actual use.

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