Induction annealing is the process of softening the necks of cases, through heating in an electrically contactless manner. This is achieved through placing the cases within a magnetic field, which induces eddy currents within the brass. Technically, the lower the resistivity of the brass, or the higher the intensity of the magnetic field, the greater are the eddy currents and, consequently, the greater the heating effect. There is no heating element as such; the only thing to get hot is the case. The magnetic field is focussed to maximise the eddy currents and heating in the location where it is specifically required, i.e. the neck and shoulder.
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Induction annealing can be used to control the material properties of metals in different manufacturing scenarios. The process of induction annealing allows accurate and reliable control over the material properties of metals inside a part, including hardness, stiffness, and stress inside. Unlike conventional methods, induction annealing produces heat directly within a workpiece using alternating electromagnetic fields.
You can use induction to anneal parts on a continuous moving line quickly. It can be done on single parts, like casings, or in line with the milling machine to draw wires or tubes. Removing a bottleneck caused by furnaces from the manufacturing line allows manufacturers greater flexibility in controlling their line speeds and reducing idle times at other stages in the process.
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The wire and cable industry typically uses induction annealing devices to anneal wire in-between and after the annealing step to improve malleability and electrical conductivity.
It is right at home on the modern high-speed spooling and rolling lines. Tube manufacturing typically requires annealing either at the time or after forming or painting. Both seamed and seamless pipes and tubes may need annealing to ensure that the products have the desired uniform and metal properties.
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