Key Words: Grinding Ball; High Carbon Chromium GCR 15; hardness; wear resistance Introduction As a kind of grinding body, grinding ball requires high hardness, the higher the hardness, the better the wear resistance. From the carbon content of the grinding ball: With the increase of carbon content of the grinding ball, the higher the hardness of the grinding ball, the greater the wear resistance, when the carbon content is about 1 %, the wear resistance reaches the maximum. Based on this principle, Changshu Lonte wear-resistant Ball Co., Ltd. (hereinafter referred to as “Lone wear-resistant ball”) using GCR15 steel to make the grinding ball. However, because of the high carbon content in GCR15 steel and the big size of grinding ball, the crack of water quenching will increase significantly. According to the characteristics of GCR15 steel, new technology must be developed to satisfy the production of grinding ball of GCR15 steel.
View More →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, 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.
View More →Quenching, a heat treatment process for grinding steel ball. Alloy products or glass heated to a certain temperature, and then in water, oil or air rapid cooling, generally used to improve the hardness and strength of the alloy. Commonly known as “dip fire. “. Heat treatment of metal cooled in air or water or oil after holding for a period of time by reheating the quenched workpiece to an appropriate temperature below the critical point. Iron and steel workpiece after quenching has the following characteristics:
View More →1.Tempering: 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.
View More →4.Whatisquenching?GrindingsteelballQuenchingistheprocessofheattreatmenttoobtainthemartensitestructurebyheatingthemetalorpartsabovethephasechangetemperatureandthenrapidlycoolingthembeyondthecriticalcoo...
View More →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.
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