High demands are placed on the sensor since rolling emulsions are used for surface finishing. The environment is of very high ambient temperatures. PTFE does not allow water or chemical solvents to stick on its surface and has a high melting point of 423⁰ C. Both F/HF 2/3/4/W constructs with a wide sensing range and IP68 class protection. AC or DC supply input combinations of transistor or relay outputs available.
Reliable Roll Detection in Aggressive Environment
Pilger mill in tube rolling mills - hot and cold pipe detection
Field-proven proximity performance in aggressive emulsions conditions in CRM mill
- Reliable detection of lock /unlock position of the back-up, work and intermediate rolls
- Increase mill availability as proximity are maintenance-free reducing downtime
- Resistant against emulsions , lubricants, coolants, water jets, dust and dirt
Chemical solvents or water stuck on the surface, affecting output and efficiency.
Challenges
- Frequent proximity failures leading massive production downtime.
- With grease accumulation, the standard 15mm sensing distance was not sufficient after 3months
- High ambient temperatures inside the mill housing combined with aggressive emulsions
- Normal PVC cable cracking after 3-months inside mill housing.
The PTFE housing is resistant to greases, oils and acids
Field proven Performance
- End-User: PLTCM / reversing cold rolling mills at Tata, JSW, SAIL,AMNS.
- OEM: Primetals preferred choice for upgrade of CRM-1 at JSW Bellary was Proxitron
Solution
- PTFE single piece housing is resistant to greases, oils and acids, e.g. in cold rolling operations.
- 19-25mm large sensing distance available
- 100 |120 °C high temperature electronics
- 260°C cable excellent resistance to acids, varnishes, oils, hydraulic fluids etc., hardly inflammable, low water absorption, weather and ozone resistant.
- Special connection cable to prevent emulsion entering the housing/ electronics.
- Universal supply voltage (20-240VAC/DC) available with combinations of transistor or relay outputs.
Products and Accessories
Key Specifications
Sn: 19-35 mm
IP: IP 68/69K
Temp: 70|100|120 °C
Supply voltage: 20-260 V AC/DC
Cable length: 2,5,10,15,20 m
# wires: 2-wire, 3-wire
Housing (Ǿ): M32, M35
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
Case Studies
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