Manufacturing method of bimetallic composite wear-resistant liner

Abstract

The invention provides a bimetal composite type abrasion-resistant liner plate and a manufacturing method, and relates to the technical field of instruments. The key technology of 'bimetal composite' is adopted, one face of a middle steel plate of the bimetal composite type abrasion-resistant liner plate is connected with a high-chromium iron casting containing a metamorphic complex agent in a casting mode, and the other face of the middle steel plate of the bimetal composite type abrasion-resistant liner plate is connected with a carbon steel casting in a casting mode. The manufacturing method for the bimetal composite type abrasion-resistant liner plate comprises the steps that 1, a high-chromium iron casting model in a liner plate casting model is casted through high-chromium cast iron molten lava containing the metamorphic complex agent, a carbon steel casting model in the liner plate casting model is casted through carbon steel molten lava at the same time, and manufactured rough casting bodies are combined into a casting; 2, the casting is made into a quenching casting through air cooling and quenching; and 3, the quenching casting is made into the bimetal composite type abrasion-resistant liner plate through tempering. The bimetal composite type abrasion-resistant liner plate is applied to a ball mill and is skillful in structure, simple in manufacturing method, stable and reliable in effect, easy to manufacture and low in cost.

Description

technical field [0001] The method for manufacturing a bimetallic composite wear-resistant liner of the invention relates to the technical field of machinery; in particular, it relates to the technical field of mechanical components of coal-fired thermal power stations; in particular, it relates to the technical field of a bimetallic composite wear-resistant lining. Background technique [0002] As far as the ball mills used in coal-fired power plant boilers are concerned, they are classified according to the ratio of cylinder length to diameter: ①. Short mills; ②. Medium-long mills; ③Long mills. The barrel of the ball mill is one of the main working parts, and the material to be ground is ground into fine powder by the impact and grinding action of the grinding body in the barrel. The key component that is fixed on the inner wall of the coal mill cylinder and the end and plays a grinding role is the liner. The lining boards are classified according to their structure: A. Fl...

AI Technical Summary

Problems solved by technology

At present, the commonly used metal liner materials for coal mills in my country mainly include the following four categories: (1) High manganese steel liner: the initial hardness is only HB 179-229, and after testing, the hardness after wear is only HB240-350; It shows that in the process of use (especially on small and medium-sized mills), it has not obtained sufficient work hardening effect, and has not fully exerted its impact and wear resistance; at the same time, its yield strength is low, and it is easy to produce plastic deformation, which makes the lining The plate is raised, and in serious cases, the mounting bolts will be broken, making disassembly difficult

(2) Medium and high carbon alloy steel liners: due to the limitations of high manganese steel used as mill liners, various medium and high carbon steels have emerged; in terms of chemical composition, among this type of steel All contain a certain amount of Cr and Mo, and some also contain relatively high Si and Mn. After heat treatment, the structure can be tempered martensite or pearlite and a small amount of carbide; ak is 30 ~ 40J / cm2, HRC is 50-55, the wear resistance of pearlitic steel is slightly worse, but it has a small tendency to crack during casting or use; it contains less alloying elements, low cost, and has better toughness than white iron, and high manganese steel Ratio, high initial hardness, high strength, strong production adaptability, but not high wear resistance

(3) High chromium cast iron (steel) liner: this type of cast iron (steel) is formed by adding 12% to 30% Cr and a certain amount of Mo to white iron; the impact toughness ak is 6 to 12J / cm 2 , HRC is 50~60, it should be smelted in induction furnace or electric furnace, it can be oil quenched after austenitization and should be tempered as soon as possible; its toughness and crack resistance tendency are worse than high manganese steel and medium and high carbon alloys, However, the wear resistance is improved. In practical applications, it is only suitable for the miniaturization of the liner shape.

[0003] Due to the existing known technologies and current status of high manganese steel lining plates, medium and high carbon alloy steel lining plates, low chromium cast iron (steel) lining plates and high chromium cast iron (steel) lining plates, there are low hardness and impact in production and application. A series of deficiencies, defects and drawbacks such as low toughness, poor wear resistance, high steel consumption, high production cost, based on the inventor's professional knowledge, work experience and unremitting pursuit of the cause, the inventor is seriously investigating, analyzing, understanding, and summarizing , On the basis of studying the existing known technology and the current situation, the key technology of "bimetallic composite" has been specially adopted, and the new product of "bimetallic composite wear-resistant lining board" and the "manufacturing method of bimetallic composite wear-resistant lining board" have been successfully developed. new method

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