Effect of high frequency quenching size - length Foshan constant Yang mechanical and electrical company

by:Hengyang Furnace     2020-09-28
How do you determine the length of high frequency quenching depth? For quenching of reading different customers and different workpiece hardening layer has different requirements, high frequency quenching length can have what effect, high frequency quenching depth than what are the reasons? Below small make up take you to look at together.     High frequency quenching & emsp;   Most high frequency quenching for industrial metal parts surface hardening, is to make the workpiece surface induced current, rapid heating surface of parts, and then rapidly quenching method of a kind of metal heat treatment. Induction heating equipment, induction heating of artifacts, for surface quenching equipment. The principle of induction heating, the workpiece on the sensor, the sensor is generally input frequency or high frequency alternating current (ac) ( 1000 - 300000 hz or higher) The hollow copper pipe. In alternating magnetic field in the workpiece to produce induced current with frequency, the induced current distribution in the workpiece is not uniform, strong on the surface, and in the internal is very weak, the heart is close to zero, use the skin effect, can make the rapid heating surface, the surface temperature to rise to 800 - a few seconds Temperature of 1000 ℃, and the core is very small. High frequency quenching and ordinary quenching of comparative advantage & emsp;   1, heating speed, can expand A transition temperature range, and shorten the transition time.     2, after quenching workpiece surface can get very fine cryptocrystalline martensite, hardness is a little higher, 2 ~ 3 hrc) 。 Brittle with lower and higher fatigue strength.     3, after the processing of the workpiece is not easy to oxidation decarburization, even some of workpiece processing can be applied directly to use.     4, the depth of hardening layer, easy to control, easy to realize mechanization and automation.     5, flame surface quenching & emsp;   Torsion and bending under alternating load function of artifacts, requirements of surface layer is higher than the core under stress or wear resistance, the workpiece surface is put forward to strengthen requirements, suitable for carbon content We = 0. 40 ~ 0. 50% of steel. High frequency quenching surface has what effect on size & emsp;   Influence of high frequency quenching size is smaller, after heat treatment products generally will produce deformation, has no regularity for deformation control in general, after lots of experiments can be found the rule, but is not decided.     Most high frequency quenching for industrial metal parts surface hardening, is to make the workpiece surface induced current, rapid heating surface of parts, and then rapidly quenching method of a kind of metal heat treatment. Induction heating equipment, induction heating of artifacts, for surface quenching equipment. The principle of induction heating, the workpiece on the sensor, the sensor is generally input frequency or high frequency alternating current (ac) ( 1000 - 300000 hz or higher) The hollow copper pipe. In alternating magnetic field in the workpiece to produce induced current with frequency, the induced current distribution in the workpiece is not uniform, strong on the surface, and in the internal is very weak, the heart is close to zero, use the skin effect, can make the rapid heating surface, the surface temperature to rise to 800 - a few seconds Temperature of 1000 ℃, and the core is very small.     The cause of the high frequency quenching depth reach have?     Quenching, such as a shaft parts material is 40 cr, required depth to achieve 7 ~ 10 mm, if choose high frequency quenching equipment will appear the following questions: & emsp;   Hardening depth of less than, and appear in crack, not be completed to process requirement.     Appeared above what are the reasons for this phenomenon, heng Yang machinery are as follows: through analysing & emsp;   Using high frequency induction heating equipment to quenching of workpiece, the workpiece required depth of 7 ~ 10 mm, a heating surface temperature is too high, there must be a crack, multiple heating can regardless of implementation, the cost is too big, even if the use of high frequency can reach such a depth, a heating estimate surface has been melt, even with heating for many times, are not guaranteed. Because of the high frequency induction heating on metal surface is the feature of heat treatment, use of skin effect, are generally less than 3 mm should be better control. High frequency current penetration depth is determined with its frequency, the current penetration is insufficient, the heating time is too long, due to skin effect, the surface temperature is too high, cause the quenching crack.     Solution: & emsp;   Such hardening depth, heng Yang medium frequency induction heating power supply, mechanical and electrical recommended intermediate frequency is high, the hardening layer depth, use whole quenching process, can meet the requirements of process.     Example above, you can see that choosing appropriate frequency of the machine, the importance of reasonable processing methods such as high frequency quenching, high frequency quenching length can try to reduce the power when the hardening coefficient, that is heating up a long time, it is helpful to deepen the workpiece hardening depth. 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