Thermal imaging camera provides accurate temperature profile of the slab eliminating the need of multiple point temperature measurement from a single sensor. |
Temperature Measurement of Caster for Billet | Bloom | Slab
Pilger mill in tube rolling mills - hot and cold pipe detection
- Consistent metallurgical properties: Scales, water do not impact measurement
- Energy Saving: Optimized heating pattern can be controlled
- Homogenize temperature: At discharge uniform temperature distribution across length, breadth and thickness
- Accurate: Scales have no impact on temperature readings
Challenges
- The customer needed the profile measurement for the slab to ensure uniform heating from edge to edge.
- It was difficult to install and maintain one single sensor for each billet / bloom.
Solution
Thermal imaging camera allows simultaneous measurement of multiple objects in different locations
- Measured temperature profile over the entire metal object
- Could be easily integrated into 24/7 control and monitoring systems
- System features included
- 450-1800°C
- 768*428 pixels
- 1µm wavelength
- 1Khz capture rate
- 3|4|8 nos of Analog 4-20mA
- Excel data logging (optional)
- 3nos of Analog 4-20mA
- Excel data logging
- 315C of ambient temperature
- Process visualization: Accurately gauge metallurgical cooling requirements
- Low maintenance cost: Multiple point temperature measurement from single sensor
- Highly durable: IR Camera installed 10m away from heat zone
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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