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Induction hardening improves the hardness of materials

Many people have tried high-frequency quenching. I don't know if you have seen the insufficient hardness in high-frequency quenching. This phenomenon can be said to be very common. Let's take a look at the related Information.


High-frequency quenching How to overcome the insufficient hardness in high-frequency quenching


If the user has insufficient hardness or unevenness in the process of using the high-frequency quenching machine, the following phenomenon occurs; the first step can be started from the material of the quenched workpiece and the change is not changed. The second step is to look at the high-frequency quenching machine. Does the work, voltage, current, and power change as before. Observe the fluctuation of various parameters of the quenching equipment, and adjust the pressure and flow of the quenching liquid carefully. It is necessary to observe whether the heating temperature of the quenching equipment is uniform and the cooling is changed. However, when viewed from the outside, the black oxide film on the surface where the hardness is reached explodes and is bright. If you can't reach it, the color is black and blue. There is no decarburization on the surface of the workpiece. There is also a shaft type quenching. Generally, the quenching is uneven and a spiral soft band will appear. This is mainly caused by improper operation. (Spiral soft belt is a typical feature caused by improper operation) If the height of the induction coil is not enough, the distance between the bus bars is too large, the rotation speed and moving speed of the parts are inconsistent when quenching, the angle of the water spray hole is inconsistent, and the parts are in The positional eccentricity in the induction coil will cause insufficient hardness. First of all, if the quenching rotation speed, moving speed, power adjustment, these three items must be repeatedly tested to find the data suitable for the quenching of their own workpieces, a written file should be established for later use. There is also a standardization of the quenching sensor, especially the inner hole machine workpiece distance of the sensor should be well-balanced, and the spacing of the water spray holes should be evenly arranged.


High frequency quenching overcomes the problem of insufficient material hardness



What are the main reasons for quenching and cracking of workpieces caused by induction hardening?

After quenching of the high-frequency quenching machine, residual compressive stress is formed on the surface of the hardened layer of the workpiece, which can improve the fatigue strength of the part, but there is residual tensile stress in the transition layer, which is the main cause of quenching and cracking of the workpiece. In order to avoid such defects, it is generally required that the distance between the two local hardened zones should not be less than 10 mm. For shaft parts with steps, the part should be hardened or the hardened zone should be 5 to 8 mm away from the step. If the carbon content of the workpiece is not uniform, the hardness should be high or low. It seems that there is no problem with the quenching medium under the inspection of carbon unevenness. The above is the experience we have summarized in practice. !




High-frequency quenching needs to overcome many problems, and overcoming the problem of insufficient material hardness is the most critical. Because the hardness is insufficient, the material cannot be applied in many occasions. If you want to know more, then pay attention to Haituo Electromechanical.
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