Ultra-compact infrared camera is used to monitor temperature profile of the bar at the cooling bed. high-performance sensor electronics allow a short reaction time of 1ms for the displaying of the temperature information of the center pixel. |
Ensuring Uniform Cooling on Cooling Bed for Billet | Bloom Caster
Pilger mill in tube rolling mills - hot and cold pipe detection
Non Contact Thermal Imaging Camera is used to increase yield and reduce maintainence costs
Challenges
In the cooling bed, it is critical that the entire length of the bar is cooled in a uniform manner. An optimized cooling rate ensures minimum distortion of the bars and results in high quality profiles and high throughput.
High maintenance costs as it is not possible change wiring while furnace is in operation
Solution
In order to obtain the real time temperature profile of the billet/bloom, a thermal camera was installed. This ultra-compact infrared camera with its with high emissivity at the short measurement wavelength of 1μm is ideally suited for non-contact temperature measurements of metallic surfaces.
System features
- Temperature range of 4500 C -18000C
- Resolution of 768*428 pixels
- Short measurement wavelength of 1µm
- 1Khz capture rate
- 4-20mA output signal
- Excel data logging and image capture (JPEG)
In parallel with the visualization of a thermal process, the high-performance sensor electronics allow a short reaction time of 1ms for the displaying of the temperature information of the center pixel.
Products and Accessories
Case Study Number
- TP3
Challenge
- The increasing flexibility of production lines requires a high adaptability of sensors. Continually changing object geometries, different temperatures and very high radiation or surrounding temperatures are no rarity.
- In a pilger mill those rough conditions can be found, among others in the production of seemless steel pipes. The raw steel blocks, each weighing a few tons are heated up first in a round oven at a temperature of 1300 °C.
- After descaling of the surface, the steel block is prepunched in a hole press with a strength from a converted 2000 t. In the next sloping rolling mill the growing pipe rotates between two rollers that are positioned at an angle to each other. The punching is widened to the size of the mandrel diameter.
Previous solution / Competitor product
- N/A
Solution
- The sensor that was installed at this application is the HMD OKA 2038.38 G with tube OL 19.
- The signal of the infrared sensors controls the movement of centering device and abutment. The point of view is restricted by the tube and prevents disturbances by steam in the cooling phase.
- An optimum adaptation to the operating conditions is given due to the adjustable response temperature. The HMD with self-learning response temperature (Auto-Teach function) is suited to continually changing conditions.
- The compact sensor with a stainless steel housing can withstand surrounding temperatures of up to 75° C. The use of a cooling jacket raises this up to 200° C.
- Alternatively sensors with fibre optic cables are available which permit an application at ambient temperatures up to 600° C without cooling.
Customer Benefits
- Maintenance-free
- High temperature stability
- Recognition of hot objects at big distances
- Self adjustment with Auto-Teach or step switch for the response temperature
Product Part number
- OKA 2038.38 G
Brand
- Proxitron
Accessories
- Piros swivel stand HM2
- Tube OL 19
- Pilot light unit (for alignment) DAK 308 + OL 26
- Different cable lengths (e.g. 15 m)
Customer Testimonial
compared to previous solution or competition
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