Hot forging die of gear and surface high-temperature self-lubricating treatment method thereof

Abstract

The invention provides a hot forging die of a gear and a surface high-temperature self-lubricating treatment method of the hot forging die of the gear. The surface high-temperature self-lubricating treatment method comprises the following steps that micro-pit textures are machined in a non-meshing-influencing area of a tooth crest area of a tooth-shaped female die of the hot forging die of the gear, the micro-pit textures are circular micro-pits arranged in an array mode, and then impurities left after machining are removed through an ultrasonic cleaning machine; and a high-temperature-resistant coating is prepared on the surface, which is provided with the micro-pit textures, of the tooth-shaped female die, and the coating is coated with a layer of heat-insulating composite lubricant. According to the surface high-temperature self-lubricating treatment method of the hot forging die of the gear, through the textured coating and the composite lubricant, the metal flow uniformity in the gear forming process is improved, the service life of the die is prolonged, and the gear forming precision is improved; the micro pits are machined on the surface of the die for antifriction treatment, and then the flow velocity difference between the tooth-shaped female die and a back cone male die is reduced; and a high-temperature-resistant coating is prepared on the surface of the non-meshing-influencing area, and then the surface of the textured coating is coated with one layer of heat-insulating composite lubricant, so that the corrosion resistance, the wear resistance, the thermal fatigue resistance and the adhesion resistance of the die are improved.

Description

technical field [0001] The invention relates to the technical field of die hot forging, in particular to a gear hot forging die and a surface high temperature self-lubricating treatment method thereof. Background technique [0002] Gears are an important type of transmission components, used to transmit motion and power between space axes, and have the advantages of stable transmission and wide application range. With the rapid development of the machinery manufacturing industry and the increasingly fierce market competition, higher requirements are placed on the precision and efficiency of gear manufacturing. At present, the processing methods of gears mainly include mechanical cutting and plastic forming, and plastic forming has gradually become the main processing method of gear manufacturing due to its advantages of high production efficiency, high material utilization rate, and high gear strength. Common gear plastic forming methods mainly include cold precision forgin...

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Problems solved by technology

[0005] In view of the above technical problems, the present invention proposes a gear hot forging die and its surface high-temperature self-lubricating treatment method. According to the metal flow law in the gear forming process, the five-axis numerical control supercharger is used only on the surface of the tooth-shaped concave die of the gear hot forging die. The fine machine tool processes the micro-pit in the non-meshing area of ​​the tooth top area for anti-friction treatment, reduces the metal flow speed difference between the tooth-shaped die and the back-cone punch, and improves the uniformity of metal flow; Prepare a coating with high temperature resistance on the surface of the micro-pit texture, such as CrTiN and CrMoN coatings; finally, fill the heat-insulating composite lubricant in the micro-texture of the textured coating surface to solve the problem of gear forming process. The problem of uneven metal flow and low life of precision forging dies occurs, so as to achieve the purpose of simultaneously improving the uniformity of metal flow and the life of precision forging dies in the gear forging process

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