Demand for reliable detection of lock and unlock position of the back-up, work, and intermediate roll in high aggressive and high temperature environment. High demands are placed on the sensor leading to frequent proximity failure due to the rolling emulsions which are used for surface finishing. Maximum availability is required for improved productivity
Measurement of mill stand proximity in aluminium mill
Pilger mill in tube rolling mills - hot and cold pipe detection
Excellent performance in aggressive conditions
- Improves availability of material and productivity
- Efficient under extremely harsh conditions Insensitive to soiling and wear-free
- Resistant against emulsions , lubricants, coolants, water jets, dust and dirt
- Maintenance-free, drastic reduction in downtime
Challenges
- Demand for reliable detection of lock and unlock position of the back-up, work, and intermediate roll in high aggressive and high temperature environment
- High demands are placed on the sensor leading to frequent proximity failure due to the rolling emulsions which are used for surface finishing
- Maximum availability is required for improved productivity
Solution
- 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.
- Proximity available in 100 °C and 120 °C ambient temperature.
Products and Accessories
Sn: 25 mm
IP 68
Temp: -25 to +120 °C
Supply voltage: 20-260 V AC/DC
Cable length: 2,5,10,15,20 m
Cable MOC: PTFE cable
No. of wires: 2-wire, 3-wire
Housing (Ǿ): M32, M35
Cable conduit protection available
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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