High-compactness ferrum-based powder metallurgy forging automobile connecting rod and manufacturing method thereof

Abstract

A high-compactness ferrum-based powder metallurgy forging automobile connecting rod is manufactured from, by weight, 85-86 parts of ferrous powder, 6-8 parts of magnesium iron hexahydride, 3-4 parts of reduced iron powder, 0.5-0.6 part of NaF, 3.1-3.3 parts of TaC, 0.3-0.4 part of zinc stearate, an appropriate amount of silane coupling agent kh550, an appropriate amount of nanometer tungsten disulfide, an appropriate amount of polyethylene glycol and an appropriate amount of deionized water. When water atomization powder is prepared, nanometer tungsten disulfide is adopted, so that the powder is good in dispersibility and lubricity, the usage quantity of lubricant is reduced, and the density of a green body is increased; finished products have few gaps, the strength of alloy is greatly improved, and forging pressure and temperature are reduced; and energy is saved, forging forming is easy, toughness is greatly improved after forging, and demolding performance is good. By means of magnesium iron hexahydride, reduced iron powder, NaF and TaC, oxygenation is reduced, alloy metallographic phases are promoted to be formed, and compactness and strength are improved.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a high-density iron-based powder metallurgy forged automobile connecting rod and a preparation method thereof. Background technique [0002] In the production of powder metallurgy parts, how to achieve the highest possible density at the lowest possible production cost, how to produce powder metallurgy parts with complex shapes that are difficult to demould due to the large surface area of ​​the aspect ratio, and how to increase the strength of the green body Higher, increasing the capacity and productivity of existing presses, these are in urgent need of better lubricants. [0003] Processes such as double pressing / double sintering (DP / DS) and powder forging are well known and can achieve parts densities of 7.4 to 7.5 g cm -3 or close to full density. However, the production costs of these processes are very expensive. On the other hand, compared with the second pre...

AI Technical Summary

Problems solved by technology

This is likely because they are much more complex than conventional pressing processes under industrial and production conditions

[0005] Although various lubricants have solved certain parts densification and demoulding problems, the performance of the parts is still not comparable to that of casting. There are many voids, high brittleness, and low strength problems, and performance needs to be improved.