Optimal Injection Process of Piston Lip

Abstract

The invention discloses an optimized injection process for a piston lip, which comprises the following steps: (1) piston composition optimization; (2) raw material inspection; (3) incoming material storage; (4) metal material phosphating: manganese in the raw material , magnesium and lead are refined separately, and then added to the phosphating solution according to the proportion and soaked for 20±3min; (5) Injection and holding pressure: the plasticizing temperature is 60°C; the temperature of the injection cylinder is 70°C, and the injection pressure is 120°C ‑130bar; holding pressure is 150‑190bar, holding time is 3‑7s; thimble ejection position is 310‑330mm, thimble ejection speed is 150‑190mm / s; The time is 90s; (6) cooling; (7) trimming; (8) two-stage vulcanization, 185 ° C for 3 hours; (9) airtight test; (10) final inspection, packaging and storage of finished products. The invention can ensure that the product continues to maintain its shape in the mold cavity during the demoulding process, improves the stability of the lip size, and further improves the sealing performance of the piston.

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.

Images