Wear-resistant vanadium-titanium gear and preparation method thereof

Abstract

The invention discloses a wear-resistant vanadium-titanium gear and a preparation method thereof. The wear-resistant vanadium-titanium gear is composed of the following components in percentage by weight: 0.18-0.33% of carbon, 2.3-3.8% of chromium, 0.3-0.5% of manganese, 0.17-0.25% of silicon, 3.8-4.2% of nickel, 1.0-1.8% of tungsten, 1.10-2.15% of vanadium, 1.48-2.57% of titanium, 0.21-0.34% of copper, 1.3-2.1% of molybdenum, 0.18-0.32% of rare earth, 0.0018-0.0041% of boron, at most 0.035% of sulfur and phosphorus, and the balance of iron and inevitable impurities. The method comprises the following steps: preheating treatment, isothermal annealing treatment, primary quenching, primary tempering, carburizing treatment, high-temperature tempering, secondary quenching, secondary tempering and shot blasting. The finally obtained gear has the advantages of high mechanical properties (wear resistance, fatigue resistance, hardness and the like), favorable comprehensive properties and longer service life, and is especially suitable for the high-speed heavy-load high-impact-force occasions with the gear module of greater than 6.

Description

technical field [0001] The invention relates to a gear, in particular to a wear-resistant vanadium-titanium gear and a preparation method thereof. Background technique [0002] Large carburized gears are usually made of low-carbon alloy carburized steel. The gear blank generally needs to go through multiple cold and hot processing processes such as forging → pre-heat treatment → cutting → carburizing and quenching → finishing machining to obtain higher surface hardness and Good core toughness makes the finished gears have excellent properties such as wear resistance, fatigue resistance, and corrosion resistance. However, there are still shortcomings such as low hardness and low wear resistance, which lead to some places where the gears need to bear high loads. The service life of gears is often not as good as expected. How to improve the working life of gears has become a short board to improve the competitiveness of the gear industry. For this reason, it is valuable to achi...

AI Technical Summary

Problems solved by technology

[0002] Large carburized gears are usually made of low-carbon alloy carburized steel. The gear blank generally needs to go through multiple cold and hot processing processes such as forging → pre-heat treatment → cutting → carburizing and quenching → finishing machining to obtain higher surface hardness and Good core toughness makes the finished gears have excellent properties such as wear resistance, fatigue resistance, and corrosion resistance. However, there are still shortcomings such as low hardness and low wear resistance, which lead to some places where the gears need to bear high loads. The service life of gears is often not as good as expected. How to improve the working life of gears has become a short board to improve the competitiveness of the gear industry. For this reason, it is valuable to achieve high wear resistance and strong contact fatigue strength even at the expense of cost. of