Rotary Spray Quenching Technology of High Chromium Wear-resistant Iron Castings

Abstract

The invention provides a high-chromium wear resistant casting iron part rotary spraying quenching process. The high-chromium wear resistant casting iron part rotary spraying quenching process comprises the following steps that the first step, a casting workpiece to be quenched is placed inside a high-temperature furnace to be heated to raise the temperature, and heat preservation is performed fora while; the second step, the high-temperature casting workpiece in the first step is placed on a rotary workbench; the third step, the rotary workbench is started, and the casting workpiece is drivenby the rotary workbench to rotate at high speed; the fourth step, spraying devices located on the side surfaces of the rotary workbench are started, and water is supplied for the spraying devices through a water supplying device and water supplying pipes; the fifth step, the water after atomization is sprayed to the surface of the rotating casting workpiece through the spraying devices, and rapidcooling treatment is performed on the casting workpiece; the sixth step, the casting workpiece after rapid cooling treatment in the fifth step is transferred onto an air cooling rack; the seventh step, an air cooling device is started, and the casting workpiece after rapid cooling treatment is cooled through the air cooling device. By means of the high-chromium wear resistant casting iron part rotary spraying quenching process, the surface wear resistant performance of high-chromium casting parts is greatly enhanced.

Description

technical field [0001] The invention belongs to the technical field of casting quenching, and in particular relates to a rotary spray quenching process for high-chromium wear-resistant cast iron, which is suitable for quenching the outer surface of high-chromium wear-resistant cast iron. Background technique [0002] Quenching is to dip the hot workpiece heated to a certain degree into the medium to improve the strength, hardness, wear resistance, fatigue strength and toughness of the steel, so as to meet the different requirements of various mechanical parts and tools. It can also meet the special physical and chemical properties of some special steels such as ferromagnetism, corrosion resistance and wear resistance through quenching. Therefore, the quenching process is widely used. At present, in the quenching process of the workpiece, most of them still use manual control of the quenching process conditions or manually change the quenching surface of the workpiece. This ...

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Problems solved by technology

[0003] (1) During the quenching process, only one side or part of the workpiece on the workbench can be cooled, and multiple sides or the whole can not be cooled at the same time. The workpiece quenching process can only be realized by artificially changing the cooling direction of the workpiece. The operation process consumes Time-consuming and laborious, and the cooling quality cannot be guaranteed

[0004] (2) During the quenching process, the uniformity of the quenching temperature of each part of the workpiece cannot be guaranteed, and internal stress will be generated inside the workpiece during cooling. When it reaches a certain level, the workpiece will be distorted, deformed or even cracked

[0005] (3) During the quenching process, especially for large castings, the entire casting to be quenched is usually placed in a pool filled with water for quenching. The above quenching process cannot guarantee a good control of the quenching temperature curve, which in turn affects The quenching effect of castings cannot be guaranteed, and the surface wear resistance of high chromium castings cannot be guaranteed

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