Forging-grinding-ball isothermal-control quenching device and method

Abstract

The invention discloses a forging-grinding-ball isothermal-control quenching device and a method. The forging-grinding-ball isothermal-control quenching device comprises an air-cooling screw conveyor, a water-quenching screw conveyor and an oil-quenching screw conveyor, and the three conveyors are mutually cooperated. First the water-quenching screw conveyor and the oil-quenching screw conveyor are respectively placed in corresponding medium grooves or one medium spray pipe with a corresponding medium is arranged above the water-quenching screw conveyor and one medium spray pipe with a corresponding medium is arranged above the oil-quenching screw conveyor. At the same time the motor rotate speeds of the air-cooling screw conveyor, the water-quenching screw conveyor and the oil-quenching screw conveyor are set according to forging grinding balls which are to be quenched. The forged medium-carbon-alloy-steel-material forging grinding balls successively enter the air-cooling screw conveyor for air cooling, the water-quenching screw conveyor for water quenching and the oil-quenching screw conveyor for oil quenching, then the forging grinding balls are conveyed, through a slideway of a discharge hole of the oil-quenching screw conveyor, to an annealing furnace for annealing treatment to the room temperature, and then the whole quenching process is finished. Through use of the forging-grinding-ball isothermal-control quenching device and the method, a bottleneck that medium carbon steels are easy to crack in quenching can be overcome, novel high-wear-resistance forging grinding balls having a certain amount of toughness can be obtained and the product quality is stable.

Description

technical field [0001] The invention relates to the field of quenching, in particular to an isothermal control quenching device and method for forged grinding balls. Background technique [0002] As a grinding medium, grinding balls are widely used in powder engineering in industries such as mining metallurgy, energy thermal power, non-metal processing, building materials, cement, coal-water slurry, and magnetic materials. Due to the need to meet the requirements of different equipment and different working conditions in various industries, the materials for manufacturing grinding balls are various, such as forged steel balls, nodular cast iron grinding balls, chromium alloy casting grinding balls, etc., and the specifications also range from ?6mm to ?150mm. Even larger diameters, so it is of great economic significance to continuously research and improve the wear resistance of grinding balls and reduce their unit loss. [0003] The forged grinding ball made of medium carb...

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Problems solved by technology

[0003] The forged grinding ball made of medium carbon alloy steel has the properties of high hardness, high wear resistance, high toughness and high impact resistance. Its performance is affected by the quenching process. Quenching in the quenching device, but the existing quenching device has a simple structure, is a single water quenching or oil quenching, and the process method is not easy to operate, the production cost is high, the internal stress of the forging ball cannot be controlled during the process, and the medium carbon Steel is easy to quench and crack, and the quenching temperature and tempering temperature are not easy to control, which affects product performance and product quality

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