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Method for monitoring device for inductive heating

A technology of induction heating and induction coils, applied in induction heating, induction heating control, electric heating devices, etc., can solve the problem that the AC current generator cannot be detected

Inactive Publication Date: 2015-08-12
EMAG HLDG GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A disadvantage of the adjusted hardening device is that, for example, certain faults cannot be detected in the resonant circuit of the alternating current generator, since these faults are compensated by the adjustment

Method used

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  • Method for monitoring device for inductive heating
  • Method for monitoring device for inductive heating
  • Method for monitoring device for inductive heating

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Embodiment Construction

[0011] The invention is explained in detail using the example of a hardening device for workpieces heated by induction coils. figure 1 The load branch of the device is shown in . The workpiece W is inductively heated by the induction coil I. The induction coil I is connected to a generator not shown. The induction coil I has a process resistance which is influenced by the workpiece W. A voltage Us is applied across the treatment resistor during induction heating. This voltage Us will change when eg the material or the temperature of the workpiece W, the geometry of the induction coil I, the magnetic coupling between the induction coil I and the workpiece W or the frequency or amplitude of the current changes. At the same time, malfunctions of the generator, for example in the resonant circuit or in the inverter, are also detected. Figure 2a The voltage-time area F of a sinusoidally varying AC voltage is shown in . By comparing this voltage-time area F with a predetermine...

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Abstract

A device for inductively heating a workpiece has an inductive load path formed by an induction coil juxtaposed with the workpiece and an AC voltage applied across the induction coil and dropping during heating. According to the method the level of the AC voltage is determined. From this determination a voltage-time area over the duration of the heating process is calculated. The determined voltage-time area is then compared to a previously established reference area.

Description

technical field [0001] The invention relates to a method of monitoring a device for heating components by means of an induction coil, according to the subject-matter of the first aspect of the invention. Background technique [0002] Such devices are used, for example, to harden workpieces. A circuit configuration for monitoring an induction hardening device is known from DE 2 322 720 A. The heat delivered to the hardening device is determined as electrical energy, and at this time, the voltage proportional to the induced voltage and induced current is connected to the multiplier. Because the delivered power varies during heating, it is integrated over the entire heating time. For this purpose, the output of the multiplier is connected to the input of the integrator. In addition, the output values ​​of the circuit configuration can be used to draw conclusions about the curing temperature, the heating depth or the effective coefficient of the inductor. A disadvantage of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/42C21D11/00G01R19/00G01R19/02
CPCH05B6/101H05B6/06H05B6/02G01R19/0084
Inventor H·克洛茨
Owner EMAG HLDG GMBH