Preparation method for manufacturing rotor of phaser through powder metallurgy

Abstract

The invention discloses a preparation method for manufacturing a rotor of a phaser through powder metallurgy. The preparation method comprises the steps that aluminum powder, high alloy base powder, copper powder, nickel powder and organic lubricant are mixed according to the following mass proportions of 4.0%-5.0% of copper, 0.5%-1.0% of magnesium, 0.5%-1.0% of iron, 2.0%-2.5% of nickel, 0.5%-1.0% of silicon, 0.8%-1.5% of the organic lubricant, no more than 2% of unavoidable impurities, and the balance aluminum; and powder metallurgy green bodies are obtained through pressing forming and are subjected to sintering, solid solution and quenching treatment, repressing, finishing and aging treatment, and turning machining is conducted on the rotor at last to meet the final size requirement. Compared with a sintered steel rotor, the rotor prepared through the preparation method is good in pressing property, higher in speed and low in pressing cost. The temperature for sintering aluminum alloy is much lower than the temperature for sintering steel; the energy consumption in the sintering process is reduced, and the powder metallurgy aluminum rotor is better in machining property and no surface protection treatment is needed in the transportation and storage process. Compared with a diecast or an extruded aluminum alloy rotor, the powder metallurgy is a near-net forming technology, and the use ratio of aluminum alloy raw materials is high; the production efficiency is high; the production cost is 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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