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Temperature Measurement in Induction Hardening Processes

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Temperature Measurement in Induction Hardening Processes

The monitoring and the controlling of temperatures is one of the most important factors to guarantee the required product quality and profitability in induction hardening processes. For these applications pyrometry allows a separate and accurate measurement and documentation of each components temperature.

When hardening the surfaces of steel, cast steel or cast iron components, the following properties have to be achieved: 

  • The component has to attain the required hardness on all desired areas
  • The desired or required hardness depth has to be achieved
  • The component must not be damaged
  • The distortion of the component should be minimal
  • The process should be as short as possible
  • The results have to be repeatable

The monitoring and the control of the temperature are essential in order to reach these targets. While too low temperatures lead to a too low hardness depth, too high temperatures may result in damage to the component. But also the duration of the inductively coupled energy, i.e. temperature, plays a significant role.

 

Process

  

Conditions

  

Recommended 
pyrometers
         
"Classic" measurement on components  

The temperatures range between 850 and 1050°C. Use of pyrometers with a short wave spectral range recommended. Various pyrometers with different optics, spot sizes and response times are available.

   IS 5 
IS 12
IS 140
         
Preheating and run-in processes  

Lower temperatures than with "classic" induction heating. Various pyrometers with different optics, spot sizes and response times suitable for applications with temperatures from 250°C.

   IGA 5
IGA 12
IGA 140
         

Measurements in "difficult" environments

  

E.g. for objects with unknown or changing emissivity, measuring objects which are smaller than the pyrometers spot size, measuring objects which move during the measurement or measurements through steam, smoke or dust.
The use of ratio-pyrometers is recommended, respectively required.

   ISQ 5
ISQ 5-LO
ISR 12-LO
IGAR 12-LO
         
Applications for fibre optics pyrometers   

The optical heads of fibre optics pyrometers can be used at ambient temperatures up to 250°C. They are unaffected by electromagnetic interferences, so that they can be used very close to the inductor. Their small design enables their use in locations that are difficult to access. They can be mounted very close to the measuring object.
Optical fibre length up to 30 meters.

  

IS 5-LO
IGA 5-LO
ISQ 5-LO
ISR 12-LO
IGAR 12-LO
         
Control of induction- generators   The power of induction generators can be controlled using digital IMPAC-pyrometers via the digital indicator DA 6000-C. This controller is very fast (1 ms) and was specially designed for induction applications.   DA 6000-C