Simulation And Analysis Of Temperature,Stress And Wear Process In Blade Die Service

The blade is complex shape, usually made of stainless steel or nickel based materials. Commonly, stainless steel and nickel based alloy features thermal expansion coefficient, small thermal conductivity and high temperature deformation. For the forced deformation of material, forging equipment need large energy, high heating temperature, increasing the deformation time. Compared with the common automobile forging die, the hot forging die of the blade is more severe, and the service life of the hot forging die is generally not high.To study the hot forging die load, the forming analysis software was utilized to simulate the temperature field, stress field and wear volume distribution during the forging process. It was found that blade blanks in root and leaf and leaf Guanchu first deformed and the region corresponding to the cavity at the end of the forging temperature range is the biggest, and leaves central body temperature variation amplitude was smaller. In the forging process, from the middle part of the cavity to the bridge, the equivalent stress was gradually reduced. The large stress distribution area was a type of cavity related to the leaf body and the root of the leaf. In the whole process of hot forging, the wear occurs first in the shape of the cavity which was associated with the connection of the blade root and the leaf. The maximum wear and the maximum wear rate appeared in the bridge position.The influence of different process parameters(i.e., the preheating temperature of the mold, the pressure of the upper die, the friction factor) on the temperature field, the stress field and the distribution of the wear rate of the die were then analyzed. When the mold preheating temperature rised, the below mold temperature would increase, the temperature rise of below the mold cavity, the equivalent stress of the model chamber will be decreased. The faster the upper die pressure, the shorter the time of the forging process, the lower the temperature of the cavity surface, and the equivalent stress of the cavity surface increases with the increasing of the upper die. When the friction factor between the blade blank and the lower mold increases, the temperature of the cavity slightly increased, and when the friction factor increased, the equivalent stress of the model chamber increased, and the increase amplitude was large.This study also revealed that in the hot forging process, the change of metal flow velocity of the blade was the main factor to affect the surface wear and wear rate. The mold temperature and the high temperature could reduce the mold temperature and the high temperature could cause the lubricant performance has declined. In order to reduce the temperature of the mold the mold has sufficient hardness and toughness. To reduce the mold temperature and the mold. In order to reduce the mold temperature and the mold. The mold can reduce the heat exchange and friction between the mold and the blank. The wear amount of the die was greatly affected by the friction. The friction factor increased with the increase of the friction factor, but the friction between the die and the surface of the billet increases gradually, and the surface temperature of the mould was higher. Analysis of the obtained leaf mold in the forging process should force, temperature and wear data could be further used to carry out the guidance of mold repair welding etc..