Intermediate frequency quenching usage: used for heating metal parts and the local surface hardened, hardened layer depth of 2mm-6mm, such as diamond saw blade, drill, lathe tool, hard alloy, gear, auto universal joint, crankshaft, fasteners and other specific for transformer.
Induction heating is a way of heating the ideal surface quenching. Due to its proximity effect and skin effect, induction heating is only the workpiece near the outer skin penetration depth of a layer of fixed value of the direct heating, internal heating is small; if the control of the heating time, increasing the heating power, is the direct heating layer too late to spread the heat within the workpiece, so that the surface hardened to meet the requirements of.
Surface hardening of medium frequency current flowing through the great figure induction coil and the heating surface of a workpiece. On the general workpiece heating time only for a few seconds, a total of internal temperature had no time to rise, then a breakpoint, and rapidly cooling water spray to the workpiece surface. Induction coil water-cooled copper, coil to just enclose the shape of the workpiece, the gap between it and the workpiece should be as small as possible.
Hardening layer depth is an essential requirement for technology, it has a great effect on the quality of the products. Hardening layer depth depends mainly on the frequency of heating power, the higher the frequency, then the penetration depth of the smaller, direct heating layer and hardening depth is more shallow. Quenching heating power supply frequency divided into intermediate frequency (2.5 and 8kHz) and high frequency (70-300kz) two categories. The relationship between the intermediate frequency quenching depth and power supply frequency of the power supply frequency: 8kHz 1.3-3.5mm, 2.5KHz fire quenching layer depth of hardened layer depth of 2.4-10mm.
The power supply also affect the depth of the hardened layer. The greater the power, the heating time is short, direct heating layer of the heat was too late to internal communication. The more shallow hardening layer. Power frequency quenching need related to the quenching area per unit area, general power taking for (0.5-2) kw/ cm.
'intermediate frequency quenching medium frequency quenching transformer'
Refers to the medium frequency induction quenching heating.
The secondary coil of the transformer is an intermediate frequency quenching induction coil.
The workpiece is placed in the AC induction coil, is heated in the alternating magnetic field under the action of.
Heating concentrated only on workpiece surface, which is called the skin effect. AC frequency depth velocity and heating heating and induction coil related, high frequency heating fast high hardness but heating layer is thin, suitable for processing small precision workpiece. Low frequency (50Hz) heating layer thickness, suitable for processing large load large workpiece. Somewhere between the intermediate frequency effect.