Designing and manufacturing method of powder injection molding piston ring

Abstract

The invention discloses a designing and manufacturing method of a powder injection molding piston ring. The elliptic equation of the piston ring is designed according to the technical requirement of the piston ring product, and the free open gap size is given; structural strength, stress strain and friction abrasion engineering are analyzed through a computer; powder materials are designed and selected, and the powder and adhesive matching radio is designed, and feedstock for injection is manufactured through mixing and pelleting; an injection molding mold of the elliptic piston ring is designed and manufactured; a three-dimensional elliptic piston ring blank piece is manufactured through injection, degreasing, sintering and postprocessing; and an opening is cut and light transmittance, elasticity, dimensional inspection, performance testing, packaging, delivery or storage are performed on the product. According to the method, the powder materials are designed and selected and the powder and adhesive matching ratio is designed though the powder injection molding technology and the computer aided design and engineering analysis. Due to the fact that the particles of the feedstock are uniform, the structure of the piston ring is more uniform, the defect of a traditional casting technology is eliminated, the design freedom degree of the piston ring is improved, and the structure of the piston ring is improved.

Description

technical field [0001] The invention relates to the technical fields of internal combustion engines, turbochargers, reciprocating machinery and general mechanical seals, in particular to a design and manufacture method for powder injection molding piston rings. Background technique [0002] Piston rings are key parts of internal combustion engines and reciprocating machinery such as compressors, and the working environment is harsh. Piston rings of internal combustion engines are generally divided into gas rings and oil rings. Gas rings mainly seal gas and lubricating oil, and need to directly contact high-temperature combustion gases. The thermodynamic and aerodynamic performance and reliability of the internal combustion engine have an important impact, so the requirements for its material, shape and dimensional accuracy are extremely strict; the oil ring mainly acts as a sealing lubricating oil, and its working temperature is low. When piston rings are used on turbocharg...

AI Technical Summary

Problems solved by technology

[0005] As we all know, due to the following problems in the traditional "casting + mechanical cutting" process: First, the cylindrical blank produced by the casting process still inevitably has defects such as segregation, pores, trachoma, and pines after machining; second, the material The utilization rate is low. Generally, the utilization rate of casting materials in the whole manufacturing process is less than 50%, and the utilization rate of sand casting materials is less than 30%. The production efficiency is low and the manufacturing cost is high; moreover, centrifugal casting is not suitable for the blank of the piston ring whose diameter is less than or equal to 50mm, and it has to be cast by mold

The patent "2004100377023, A Powder Metallurgy Piston Ring and Its Production Method" adopts the traditional powder metallurgy pressing (Pressure Molding, PM) forming process to produce iron-based powder piston rings. However, since the cost of powder and its press forming process is higher than the cost of casting, the total cost has not improved much, so it is difficult to popularize and apply the press process to manufacture piston rings

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