Increasing the quenching temperature will coarsen the grain. For this reason, the following process can be used to solve the problem. That is, use 520°C and 950°C twice to fully preheat, and then allow it to rapidly rise to a high temperature and cause the surface to reach a higher temperature (1150°C). To prevent grain growth. The use of high temperature for a short time to heat the surface and the heart can be different quenching heating temperature and different degrees of alloying, this can ensure that the mold surface has a higher hardness and wear resistance, and the heart has a good toughness. Change quenching cooling method The pre-cooling temperature after quenching heating should be controlled above 920°C (above Acm) to prevent precipitation of carbides (which can be placed in a preheated furnace at 950°C), then austempering is used to quench the red die A temperature slightly lower than the temperature at the Ms point is a little more than a minute, and then isothermal at around 400°C to obtain the lower bainite structure.
Surface hardening shot peening is an effective measure to improve the fatigue strength of red die. By shot peening, the hardness, stress state (compressive stress) and roughness of the die surface are changed, thereby increasing the service life of the red die. The test shows that the residual compressive stress of the die after shot peening at 600°C remains at 157 MPa until 650°C. Therefore, the residual compressive stress of shot peening is still valid in the working range of hot work (600-620°C). Application effect Production practice shows that after adopting the above three technical measures, the service life of the red die has been greatly improved. It can be extended from the original 5 months to one year and paid for one year. The effect is significant. The composition of singeing equipment. Generally, the singeing machine is composed of a feeding frame, a bristle box, a gas crater or a metal hot plate and a cylinder, a fire extinguishing box or a liquid immersion tank and a drop cloth rack.
A variety of light colors for different environments: white light
Product size: aluminum + glue +PC cover
Main application: outdoor lighting, point light source
LED Pixel light,LED Pixel lights,Pixel light,Pixel lights
SHENGYA LIGHTING TECHNOLOGY CO., LTD. , https://www.syalighting.com