There are also many factors to consider in selecting the use material for the gear forgings. In general, the working conditions of the gear forgings are different, the failure forms of the gear teeth are different, which is the basis of determining the strength calculation criterion and selecting material and heat treatment.
The material of gear forgings must first meet the requirements of working conditions. The requirement of working condition is the first factor to be considered when selecting the gear forging material. Alloy steels are often used in the production of high-speed, heavy-duty and under impact load work of the gear forgings, such as for aircraft gear, to meet the quality of small, transmission power and high reliability requirements, it is necessary to select high mechanical properties of alloy steel, If the gear size is required to be as small as possible, the high strength alloy steel should be treated by surface hardening. In the mining machinery, the gear transmission, the general power is very big, the work speed is low, the ambient dust content is extremely high, then often chooses the casting steel or the cast iron and so on material. The power of household and office machinery is very small, but it requires smooth transmission, low noise or no noise, and can work normally under less lubrication or lubrication condition, so the engineering plastics are often used as gear material.
The size of gear, blank forming method and heat treatment process should be considered in selecting the gear forging material. Large-size gears generally used casting blanks, can choose cast steel or cast iron as gear material. Medium-or medium-sized gears with higher requirements often choose forged blanks and can be made of forged steel. Small size and low requirements, the use of round steel to make blanks.