Effect of laser quenching process on surface hardness and wear performance of cylindrical slideway on the upper base of combined vibration separation equipment

Abstract

Abstract Combined vibration equipment is widely used in the separation and classification of grain, mineral and other granular materials. The cylindrical slideway on the upper part of the base of the combined vibration equipment bears all the weight of the vibrating silo and the particulate matter in the vibrating silo during the vibration process, and supports the combined vibration of the vibrating silo and the particulate matter in the vibrating silo, the cylindrical slideway on the upper part of the base is seriously worn. The vibrating silo can only vibrate horizontally and linearly along the cylindrical slide on the upper part of the base and swing back and forth around the center of the bottom surface of the cylindrical slide on the upper part of the base. It is required that the cylindrical slide on the upper part of the base has good strength and toughness, and the contact surface has a hardness of more than 35HRC to ensure wear resistance. The effect of laser surface quenching process on the surface hardness of the upper cylindrical slide of the base is studied by using the method of three factors and four levels. The experimental results show that after laser surface quenching, the minimum surface hardness and the maximum surface hardness of the upper cylindrical slide of the base are 35.6HRC and 39.6HRC, which meet the hardness requirements of vibration equipment for the slide of the base. When 1450W laser quenching power, 500mm/min laser scanning speed and 2.25mm laser spot diameter are used, the maximum surface hardness will be 39.6HRC, which is about 38.6% higher than that of the pretreated sample. The maximum section hardness of test sample 14 after laser quenching reaches 388HV, which is about 1.25 times higher than that of the matrix in the quenching areas of samples 13, 15 and 16. It is close to the matrix hardness when it is 1.6mm away from the surface. The thickness of the surface hardened layer exceeds 0.6mm, indicating that the greater the laser power, the greater the thickness of the hardened layer. In the wear test, the minimum wear amount of sample 14 is 0.0331g, which is about 25.2% of the matrix wear amount of 0.1312g. The larger the laser power is, the smaller the scanning speed and spot diameter are, which plays a positive role in promoting the reduction of sample wear. We will use the laser surface quenching process parameters of sample 14: laser power 1450W, spot diameter 2.25mm and scanning speed 500mm/min to conduct laser quenching on the upper cylindrical slide surface of the base of the combined vibration equipment in order to obtain a thicker hardened layer and higher hardness, and greatly improve the service life, safety and stability of the combined vibration equipment.