A preparation method of powder metallurgy phaser rotor

Abstract

A method for preparing a powder metallurgy phaser rotor, the steps of: mixing aluminum powder, high-alloy mother powder, copper powder, nickel powder and an organic lubricant according to the following mass ratios: copper 4.0-5.0%, magnesium 0.5-1.0% , iron 0.5-1.0%; nickel 2.0-2.5%, silicon 0.5-1.0%, organic lubricant: 0.8-1.5%, unavoidable impurities not exceeding 2%, the balance being aluminum; powder metallurgy green body obtained by pressing, Then sintering, solution quenching, repressing finishing, aging treatment, and finally turning the rotor to meet the final size requirements. Compared with the rotor made of sintered steel, the present invention has better pressing performance, faster speed and lower pressing cost; the temperature of sintered aluminum alloy is much lower than that of sintered steel, the energy consumption in the sintering process is reduced, and the processing performance of the powder metallurgy aluminum rotor is better Well, there is no need for surface protection treatment during transportation and storage; compared with die-casting or extruded aluminum alloy rotors, powder metallurgy is a near-net-shaping technology, with high utilization of aluminum alloy raw materials, high production efficiency, and low production costs Low.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, in particular to a method for preparing a phaser rotor made of powder metallurgy, which is applied to a variable valve timing system of an engine. Background technique [0002] The variable valve timing can optimize the valve characteristic parameters, improve the intake and exhaust performance of the engine, and better meet the requirements of the engine's power, economy, and exhaust emissions at high and low speeds, high loads and light loads, and improve overall performance. Overall performance of the engine. According to the structural classification, hydraulic continuously variable phasers can be roughly divided into two categories: vane type and plunger type. The vane-type continuously variable cam phaser system uses the internal oil pressure to act on the vane to deflect it, realizing the stepless adjustment of the phase angle. Under the same circumstances, the phase adjustment ...

AI Technical Summary

Problems solved by technology

With the requirements of lightweight automobiles, aluminum alloy phaser rotors appear. The manufacturing form is die-casting or extruded profiles and then machined. The processing volume is large, the processing cost is high, and the material utilization rate is low. Due to the limitation of the manufacturing method, the material composition is relatively low. Fixed, alloying elements cannot be changed at will, and products containing high silicon content or containing silicon carbide particles cannot be manufactured

Die castings have some inherent defects, such as: during casting, the temperature at the front end of the melt is too low, and traces (cold lines) are produced when they are stacked; it is easy to produce defects such as pores and shrinkage cavities, the microstructure is uneven, and the surface grains Thinner, coarse grains in the core, seriously affecting the mechanical properties of parts; most die-casting aluminum alloys cannot be heat treated, so the strength is not high

Extruded deformed aluminum alloy rotors can be strengthened by heat treatment and have high mechanical properties, but the production process is complicated. For products with complex shapes and high precision requirements, a large amount of machining is required, and the production cost is high.

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