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An example of the mature experience of induction heating treatment of a rotor wheel on a power tool and a rotor shaft on another power tool. For example, the drive wheel made of steel has a modulus, a number of teeth, and a full tooth depth. The technical requirements are as follows: the depth of the hardened layer is along the surface of the toothed curve and there is no crack after tempering. The inductive power supply used is the type frequency of the electron tube, the power, the inner diameter of the inductor is small, and the height is the cooling mode. The direct injection type of the solenoid valve is mounted on the vertical quenching machine, and the liquid is quenched by one heating.
Preheating before heating and quenching, delaying the spray cooling after the end of heating quenching, the cooling medium is the concentration of Derun Baoyi, and the control of the whole process is automatically controlled. The quenching hardness obtained basically meets the technical requirements, and then the tempering and stress treatment, the product quality is all qualified. Anti-shock protection of power tools talk about the electric shock protection of electric tools Zhou Hui who is the most technical supervision technology of the northern city.
There are two types of electrical injuries and electric shocks caused by electric shock to the human body. It is considered that it is impossible to get rid of the lower limit of current, and considering the time effect of electric shock, the critical value of dangerous current can be expressed by the following formula: the dangerous current in the fly type is the maximum value of the current, and the time is short, then it can be tolerated. The current is larger. The effect of current on the human body is related to the current intensity, current frequency and the body's own resistance condition. Under one condition, from the medical point of view, the current through the human body will produce the following effects.
Some sensitive people can sense the current, and when the frequency is reached, the inductive power supply is the electron tube type frequency, the power is controlled by the whole process, and the hardness of the induction heating is basically the hardness after quenching. All meet the technical requirements. The quality of the tested products is all qualified.
Influencing the quality factor of induction heating In the induction heating process, it often encounters some quality problems, such as insufficient hardness, soft spots, irregular characteristic curve of hardened layer, over-burning oxidation, and even cracking. The quality defects caused by the above induction heating mainly include the chemical composition of the raw materials, the presence of non-metallic inclusion sensors in the matrix structure, and the method and time of matching cooling. Most of these defects are single factors that occur in a part or part of a part. Through the adjustment of the process route or the adjustment of the process parameters, it can be overcome.