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  Casting is the process of melting the metal into a required liquid and pouring it into the mold. After cooling, solidifying and cleaning, a casting (part or blank) with a predetermined shape, size and properties can be obtained It is the basic technology of modern machinery manufacturing industry. The cost of casting blank is low, especially for the parts with complex shape, especially with a complex cavity, it can show its economy, at the same time, its adaptability is wide, and has better comprehensive mechanical properties. However, there are more materials (such as metal, wood, fuel, molding materials) and equipment (such as metallurgical furnace, sand mixer,   grinding ball molding machine , core making machine, sand falling machine, shot blasting machine, etc.) needed for casting production And will produce dust, harmful gases and noise and pollution of the environment. Casting is the process of melting the metal into a required liquid and pouring it into the mold. After coolin

  1. Tempering for grinding casting ball : The microstructure obtained by high-temperature tempering is tempered sorbite. The main purpose of tempering is to eliminate quenching stress and get the required structure. According to the different tempering temperature, tempering can be divided into a low temperature, medium temperature, and high temperature. Tempered Martensite, troostite, and sorbite were obtained. The quenching and tempering heat treatment is called quenching and tempering heat treatment, which aims to obtain the strength, hardness, and plasticity, toughness is better comprehensive mechanical properties. Therefore, widely used in automobiles, tractors, machine tools and other important structural parts, such as connecting rods, bolts, gears and shafts. Hardness after tempering is generally HB200-330. 2. Annealing The main aim of annealing is to make the internal structure of the metal reach or close to the equilibrium state and to prepare for the subsequent processing a

  3.The graded austenitizing isothermal quenching process 3.1 Effect of grade austenitizing austempering on mechanical properties of  Grinding Ball After the ball was austenitized at 980 °C for 150 min + 920 °C for 30 Min, and then put into a salt bath furnace at 260 °C for 30 min and 50 Min, the hardness and impact toughness of the ball were tested as shown in Table 3. The hardness and impact toughness of the grinding ball after 30 Min and 50 min austenitizing austempering are equivalent. The surface hardness is about 59HRC, the center hardness is about 54.5 HRC, and the impact toughness is 7.1ー7.4 J / cm2. The surface hardness of the grinding ball is similar to that of the quenched and tempered state, the impact toughness is greatly improved, and the comprehensive properties are slightly improved. 3.2 Effect of graded austenitizing austempering on microstructure The microstructure of the grinding ball after 50 Min austenitizing isothermal quenching is shown in Fig. 6. There are a lot