Instrumentation/Measurement Hot Forming Processes require exact


Temperature Control LumaSense non-contact temperature monitoring solutions for press hardening are designed to meet the critical quality assurance standards required by CQI-9


The requirements regarding the adherence to tight temperature limits in hot forming processes become evidently more stringent. Reasons for that are continuously increasing quality requirements on materials, in particular on steel parts.


Especially in the automotive industry, highest demands are set on materials and processes due to the constantly increasing safety and quality requirements alongside with material savings for weight reduction, especially in the manufacture of body parts.


For the mentioned weight reduction on vehicle parts, the so-called press hardening process is used during body production. This allows a reduction in material thickness while achieving high strength values. A heating range can be precisely defined on dedicated components to form a hardened as well as a non-hardened area.


This means that a single component with different strength values can be manufactured, e.g. for crumple zone and passenger compartment.


The observance of the tightest temperature tolerances is an essential parameter for quality assurance in order to ensure a graduated, locally defined heating zone.


In order to minimize measurement errors that can be caused by external influences (for example, surface variations, reflections), the selection of a suitable thermal imager for this process is urgently required.


Non-contact temperature measurements on metal surfaces should always be carried out at the shortest wavelengths. This implies that a thermal imager should measure in the near infrared, the wavelength being dependent on the desired process temperature.


In hot forming applications (e.g. press forging, bending, press hardening), correct forming and heat treatment temperatures are instrumental in meeting the specified quality requirements and achieving optimum characteristics of work pieces. In addition to precise temperature measurements, closed-loop process control and documentation of measured data are strongly required.


To minimize systematic measuring errors, which may be caused by external influences (e.g. surface variations, reflections), temperatures on metal surfaces should always be measured at the shortest possible wavelength. This


MARCH/APRIL 2018


The field of view of the thermal imaging camera should cover the entire component, whereby the measurement angle should not be less than 30° to the measurement surface.


The MCS640 thermal imager by LumaSense Technologies offers perfect qualities for measurements on metallic surfaces. With a resolution of 640 x 480 pixels over 34,000 measuring points on the component surface can be defined.


A high accuracy of 0.5% of the measurement temperature guarantees for accurate temperature measurement of the component, whereby a change in the emissivity at the surface e.g. caused by a measurement error of 10% error of less than 1%.


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ENQUIRY NO. 15


implies that the pyrometers and thermal imagers should measure in the near infrared range, depending on the desired process temperature. Especially during hot press forming processes it is necessary to control the workpiece on several points of the surface.


The use of a thermal camera in the near infrared range enables the determination of an exact temperature distribution. The temperature data measured by the thermal imager allow for an exact process control, in addition these measured values are also documented.


Thanks to a fast response time in the millisecond range, a thermal image can be recorded when inserting the workpiece into the press and evaluated via the software. Due to the compact design of the MCS640 with air / water cooling housing, the camera can be placed optimally on the side of the press.


By using the MCS640 Thermal Imaging Camera it is possible to monitor and document the entire pressing process with the required and necessary accuracy.


According to CQI-9 Heat Treat System Assessment especially for vehicle parts, the temperature distribution during curing process must be recorded. This cannot be provided by a point measurement via a pyrometer.


After the pressing process, it makes perfect sense to monitor the component temperature with a medium wave camera to ensure that the cooling process has reached temperatures below 150°C at any point during pressing.


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