Zhengzhou Gou's brief analysis of the camshaft's quenching using ultrasonic induction heating power supply, and the impact of its heating temperature and heating speed on its performance

In order to meet the working performance of the camshaft, we need to use an ultrasonic induction heating power supply to quench the camshaft. Based on the understanding of the quenching process, it can be seen that the mechanical properties of the camshaft after quenching are affected by many factors. , such as own factors, environmental factors, etc. Today, Zhengzhou Gou's will talk about the impact of heating temperature and heating speed on camshaft performance.

The correct selection of quenching temperature and heating rate in induction quenching has a great impact on the mechanical properties of the workpiece. Quenching temperature is a function of heating rate. As the heating rate increases, the quenching temperature should also increase. Because the heating rate has a great influence on the critical point position of the original structure of the steel, rapid heating will move the phase transformation of free ferrite to a higher temperature range.

Once the heating rate is changed, the quenching temperature also changes. Different heating rates also have an impact on the mechanical properties of the quenched layer. It is generally believed that a heating rate of 150 to 200°C/s is more beneficial to performance. When the heating rate is low, the width of the transition zone after quenching is larger, which will affect the fatigue performance. In order to improve the fatigue strength of induction hardened parts, it is required to reduce the width of the transition zone, but this is only possible by increasing the heating rate.

If the carbon content in the quenched steel is low and there is more free ferrite in the steel, the heating rate will have a greater impact on Ac3. Therefore, when low carbon steel is induction quenched using a super audio frequency induction heating power supply, the quenching temperature will increase to a greater extent.

Generally, the time spent in the austenite state during induction quenching is short, and the austenite grains do not have time to grow. Therefore, overheating will not occur even when the induction quenching temperature is 100 to 150°C higher than the quenching temperature of general heating. For example, workpieces made of 45# steel are generally quenched at 820-840°C, while induction quenching is performed at 900-915°C. Fine needle-like martensite can still be obtained after quenching.

When the original structure is fine and dispersed pearlite, rapid heating will not increase the Ac3 point much, so the quenching temperature should not be selected too high. The coarse original structure diffuses farther during phase change, which prolongs the phase change process accordingly. Therefore, a higher quenching temperature must be selected in the process.

When the heating speed is not high enough, due to the heat transfer of the material, the temperature of the transition zone may be higher than the tempering temperature during pre-quenching and tempering, thereby causing the hardness of the transition zone to decrease and the strength to be weakened. Therefore, even if it is light, Fatigue cracks are also prone to initiate under load.When the heating speed is not high enough, due to the heat transfer of the material, the temperature of the transition zone may be higher than the tempering temperature during pre-quenching and tempering, thereby causing the hardness of the transition zone to decrease and the strength to be weakened. Therefore, even if it is light, Fatigue cracks are also prone to initiate under load.

When measuring and controlling temperature, it must be noted that the surface of the parts should be clean and free of dirt. Because water vapor, oil fume and dust on the heating surface of the workpiece will affect the sensitivity of the photoelectric pyrometer.

Zhengzhou Gou's electromagnetic induction heating equipment manufacturer has been engaged in the production and sales of induction heating equipment for fifteen years. It has a good understanding of the heat treatment of workpieces. If you want to know more about the factors that affect the performance of workpieces, please feel free to leave us a message.