As an important part of the car, the crankshaft plays a very important role in the overall operation of the car. The working environment of the crankshaft is quite harsh, so the requirements for it are quite high. For this reason, we need to perform quenching heat treatment on the crankshaft. Previously, the crankshaft journals were quenched using split-type inductors. This technology has been replaced by the crankshaft rotating quenching machine using a semi-ring type inductor due to problems such as uneven heating zones, easy quenching cracks in oil holes, and the inability to achieve journal fillet quenching. However, this quenching method also has its own problems. Certain flaws. After continuous research, Zhengzhou Gao's has developed a new crankshaft journal induction quenching and tempering process. This process requires the use of a new medium-frequency induction heating power supply. Today, we will talk about the advantages of using medium frequency induction heating power supply for quenching and tempering heat treatment of crankshaft journal.
For the rotary quenching of the semi-ring crank journal, especially when the connecting rod journal rotates around the center line of the main journal, the speed should not be too high, generally 24-32r/min. It requires the quenching transformer inductor group, cables, water pipes, etc. to swing together. These manufacturers have high manufacturing costs and have been gradually eliminated.
The crankshaft journal is quenched and heat treated using a medium frequency induction heating power supply, which has the following advantages:
1) Simple operation, good reproducibility, easy maintenance, compact equipment, and its floor area is only 20% of the rotary quenching machine tool.
2) The heating time is short, generally 1.5-4s for each journal, so the deformation is reduced. During rotational quenching, the heating time of the crankshaft neck is usually 7-12 seconds.
3) The structure of the sensor is composed of upper and lower thick copper blocks. It is processed by CNC machine tools without any brazing parts, so it is not easy to deform, has fewer components, and has high reliability; the gap between it and the journal is larger than that of the rotary half-ring inductor, which reduces stress corrosion and stress fatigue. The service life of this inductor is more than 4 times that of the semi-ring inductor.
4) The sensor of this medium frequency induction heating equipment does not use spacer positioning blocks and has a long service life.
5) The controllability of the quenching process is relatively good, and the saddle-shaped hardened layer is not easy to appear.
6) The heating time is short, which reduces the decarburization and oxidation of the surface, reduces the grain growth, and reduces the heat conduction loss.
7) In addition to quenching, this equipment also provides induction tempering. The tempering time is short and the temperature is slightly higher than the general tempering temperature.
8) The fixed heating inductor covers the entire journal surface and has less radiation convection loss, so the heating efficiency is high.
9) Induction tempering is an energy-saving process. Its tempering electrical efficiency reaches 96% - 98%, and the energy is limited to the journal part, not the entire crankshaft is heated and tempered.
10) Due to the reduction of oxide scale, the filtration requirements of the device are reduced.
The use of medium frequency induction heating power for quenching and tempering heat treatment of the crankshaft journal has considerable advantages. As a professional manufacturer of medium frequency induction heating power supply, Zhengzhou Gou's has been engaged in the production and sales of induction heating equipment for more than 15 years. It has a very good understanding of the heat treatment of various parts. If you want to know more about equipment or workpiece heat treatment For information, please feel free to contact us.
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GS-ZP-1200
