Method for manufacturing engine connecting rod through aluminum-base powder metallurgy and forging

Abstract

The invention discloses a method for manufacturing an engine connecting rod through aluminum-base powder metallurgy and forging. The method comprises the following steps that a plasticizer is dissolved in a plasticizer solvent, and thus a plasticizer solution is formed; powder materials obtained after batch calculation and weighing are added into the plasticizer solution, wherein the powder materials comprise, by weight, 93.5% of aluminum powder, 5% of copper powder, 1% of silicon powder and 0.5% of magnesium powder; a demoulding lubricant is added, and all materials are placed in a mixer to be mixed to be uniformly distributed; the power materials are pressed into a preformed blank on a pressing machine; the preformed blank is sintered at the temperature of 610-620 DEG C in a vacuum sintering chamber with the vacuum degree being 720-740 mmH2O till the preformed blank is completely alloyed; then a sintered body is moved into a heat preservation furnace with an oxidation-free atmosphereto be subjected to heat preservation for 30 min; and the sintered body is heated again and forged after being cooled to the indoor temperature.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a method for preparing an aluminum-based powder metallurgy forged engine connecting rod. Background technique [0002] Traditional ordinary die forging and machining methods have been difficult to meet the requirements of high quality, high precision, high efficiency, low consumption and low cost in today's industrial production of automobiles and motorcycles. At the end of the last century, foreign countries have successfully developed a new metal plastic forming process - powder forging, which has been successively forged into forgings such as automobile connecting rods and differential planetary gears, and the world's first powder forging production line has been built. It is a less and non-cut metal processing method with market competitiveness developed by the organic combination of conventional powder metallurgy technology and precision forging. Metal powder is u...

AI Technical Summary

Problems solved by technology

The disadvantage of this invention is that the connecting rod made of iron-based powder metallurgy is three times the weight of the aluminum-based powder metallurgy connecting rod, and the wear resistance is much lower than that of the aluminum-based powder metallurgy connecting rod, which is corrosion-resistant Good performance, light weight, and can withstand high working load, good thermal conductivity, low noise

[0005] Because the aluminum powder is very soft, it is prone to cold welding when it is pressed into the mold, that is, the aluminum powder and the mold wall are easy to stick and cannot be demoulded.

At the same time, when aluminum-based products are sintered, metal beans tend to flow out of the surface of the product, and the cross-section of the product is black and the strength is low.