Environment-friendly machining method of screw rod wear-resistant layer
A processing method and wear-resistant layer technology are applied in the environmental protection processing field of screw wear-resistant layer, which can solve the problems of difficult control of nitrogen consumption and inconvenient operation, and achieve the effects of smooth screw surface, improved smoothness and extended service life.
Inactive Publication Date: 2019-04-19
浙江华业塑料机械股份有限公司
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However, the amount of nitrogen used in this process is not easy to control, and the operation is inconvenient, so this process needs further improvement
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[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0033] like Figure 1 to Figure 4 As shown, the environmentally friendly processing method of the screw wear-resistant layer of the present embodiment includes the following steps,
[0034] 1. Place the screw 1 to be processed in the nitriding furnace, raise the temperature in the nitriding furnace to 320-580°C, feed ammonia and nitrogen into the nitriding furnace, and maintain the gas pressure in the nitriding furnace 400-600Pa, keep the screw nitriding in the nitriding furnace for 40-70 hours;
[0035] 2. After reacting the screw in the nitriding furnace for 40 to 70 hours, stop the gas supply and heating to the nitriding furnace, and let the screw 1 naturally cool in the nitriding furnace for 12 to 24 hours;
[0036] 3. After cooling the screw for 12 to 24 hours, heat the screw again in the nitriding furnace, and at the same time, feed am...
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Abstract
The invention provides an environment-friendly machining method of a screw rod wear-resistant layer. According to the environment-friendly machining method, a screw rod is placed into a nitriding furnace the temperature is raised to 320-580 DEG C, ammonia gas and nitrogen are introduced into the nitriding furnace, the air pressure is kept to be 400-600 MPa, and the nitriding is kept for 40-70 hours; the screw rod is naturally cooled in the nitriding furnace to 12-24 hours; the screw rod is heated in the nitriding furnace, ammonia gas and nitrogen are introduced, the air pressure and temperature in the nitriding furnace are kept as the same as that of the step 1, propane gas is introduced, and the flow rate of the propane gas is 50-200 ml / min for 3-8 hours; hydrogen and oxygen are introduced into the nitriding furnace, the volume percent of hydrogen is 85-95%, the volume percent of oxygen is 8-12%, the temperature is 520-550 DEG C, and the temperature is kept for 50-70 minutes; and thescrew rod is cooled to the room temperature to finish machining operation. The method has the advantages that chromium metal does not need to be used, the method is green and environment-friendly, andthe screw rod wear-resistant layer is high in anti-fatigue strength, good in corrosion resistance, smooth in surface and firm and durable.
Description
technical field [0001] The invention relates to the technical field of screw production, in particular to an environmentally friendly processing method for a wear-resistant layer of a screw. Background technique [0002] There is an existing Chinese invention patent with the application number CN201510102630.4 titled "A Composite Heat Treatment Process for Improving the Surface Compactness of Nitrocarburizing Strengthened Layer", which discloses a composite heat treatment for improving the surface compactness of nitrocarburized reinforced layer process, the process steps mainly include 580℃±10℃, 0.5~1.5h, and the experimental nitriding potential value is 0.40~0.80atm -1 / 2 The composite process of short-time low nitrogen potential nitrocarburizing and austenitizing treatment at 680°C±10°C and isothermal aging treatment at 180°C±10°C. The heat treatment process of the invention is easy to operate and easy to implement, effectively inhibits the denitrification behavior during ...
Claims
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IPC IPC(8): C23C8/34
CPCC23C8/34
Inventor 夏增富夏瑜键
Owner 浙江华业塑料机械股份有限公司