The half shaft is a kind of shaft that connects the differential and the driving wheels. It is used to transmit the power between them when it is working. Therefore, the half shaft will be subjected to corresponding torque and friction. Fatigue fracture or wear deformation occurs. Therefore, for qualified half shafts, it is required to have high strength and hardness, good fatigue resistance and impact toughness, etc. When producing half shafts, we will use medium carbon steel with better performance for manufacturing, and pass The high-frequency induction heating machine needs to be tempered and quenched to make its performance meet the technical requirements. But in this process, there may be some different shortcomings of the half shaft due to reasons such as heating equipment, cooling medium or improper operation. However, after many experiments, we have also found some solutions and preventive measures to avoid the half shaft. Generation of defects during heat treatment.
1. The hardened structure inside the half shaft is not uniform, because the temperature is too low during induction heating or the speed is too low during cooling. In this regard, we must operate in strict accordance with the standard process parameters when performing heat treatment on the half shaft.
2. The splines at both ends of the half shaft are cracked or injured by electricity. This is because the cooling medium after quenching is too fast and the depth of the hardened layer is deep; the half shaft is not annealed before secondary quenching or induction The positioning of the device is not accurate, etc. In this regard, we can increase the temperature during quenching, and choose hot water as the cooling medium; before quenching it with the high-frequency induction heating machine, the distance between the inductor and the half shaft must be fixed to prevent collisions; ensure that the half shaft The heat treatment process is operated correctly.
3. The semi-shaft has a soft band phenomenon after quenching. This is because the speed of the semi-shaft is not uniform when it is rotating or moving; The water hole does not correspond to the quenching part. In this regard, we need to choose a suitable sensor and increase the heating temperature; when heating, the semi-axis should rotate at a constant speed; improve the water spray device so that there is a good distance between the sensor and the semi-axis.
4. After quenching, oxidation and deformation appear on the surface of the half shaft. This is because the quenching stress is too large, the heating time is too long, and some structural defects appear in the material itself before production. In this regard, we must first check the quality of the raw materials, strictly implement the heat treatment process parameters during operation, make a record of each step, and straighten the deformed part of the half shaft in time after quenching.
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