Forged Magnesium Wheels Anti - Cracking Performance
Forged Magnesium Wheels Anti - cracking performance
China forging industry during the Ninth Five-Year period has made new progress. Mainly in the following areas: forging industry independent forging enterprises in the increase, that is, from the all-round factory independent of many self-financing, independent legal personality forging enterprises; forging production to the development of professional products has made significant progress, many professional production lines Has been formed; forging industry during the Ninth Five-Year technological transformation of the biggest feature is filled and filled, the formation of a number of existing equipment to produce precision products, production lines and technology; Nine during the forging enterprises attention to market operations, ; Special forging process to promote the use of new results, the use of wedge rolling mill precision forging shaft and camshaft production line about 100, according to the crane wheel forging waste heat and heat treatment process is different from the current production of commonly used crane wheel forgings There are three main types of waste heat treatment: forging heat quenching, forging warm isothermal annealing and the use of forging part of the waste heat treatment. Today we first come to understand the forging quenching.
Forging hot quenching is a process that combines hardening and quenching together immediately after hot forging to obtain a quenched medium.
There are many factors that affect the performance of forged hot parts, such as forging heating temperature, forging temperature, final forging temperature, after forging to quench time, quenching medium and its temperature, tempering temperature and deformation.
1. Forging temperature
In order to improve the strength and toughness of hot forging hardened parts, low heating temperature (austenitizing temperature) and forging temperature should be used. Comprehensive consideration, the general structural steel, forging heating temperature around 1200 ℃ is more appropriate.
The effect of the deformation on the performance of the forged hardened parts is not monotonic, due to deformation strengthening accompanied by de-strengthening. The effect of deformation strengthening is mainly determined by deformation. With the increase of deformation, the strengthening effect is more obvious, but the re-crystallization of the strengthening effect is also intensified. As a result of the superposition of the two effects, The best deformation.
In order to make the forging hardening get a good strengthening effect, in the forging die design should take into account the various parts of the forging should have a certain deformation. Try to be consistent, so close to the best deformation. Forging hot parts of the deformation is generally controlled in 15% to 35% more appropriate.
Wheel is a classification of forgings, mainly used in the door crane - port machine - bridge crane - mining machinery. Also known as: days wheel, crane wheels, harbor wheel, wheel forgings, wheel forgings, forged steel wheels and so on.
The wheels are relatively easy to damage the parts. According to the characteristics of the use of traffic, the wheel tread has a higher hardness, and there is a certain depth of the hardened layer and the transition layer (depth> 10mm, hardness HRC40-48), to improve the carrying capacity, wear resistance and contact fatigue performance. At the same time, the requirements of its matrix to have a good comprehensive mechanical properties and good state of the organization, the hardness should be HBS187-229, so that it has a high toughness, improve the impact resistance and anti-cracking performance.
Let's take a look at the process of the wheel processing.
First, material: ZG50SiMn
Second, the processing process
1, casting: casting to ensure uniform material, no pores, trachoma, and then annealing.
2, lathe rough car blank hole, cylindrical, diameter stay 2mm remaining heat to be fine after the car into.