Infrared camera monitors temperature during container glass gob cutting. Production quality was improved and reject ratio was minimized. Earlier issue of cracks in container glass was resolved and it maintained consistent thickness throughout the container glass. |
Temperature Monitoring during Container Glass Gob cutting
Pilger mill in tube rolling mills - hot and cold pipe detection
- Improved quality of production
- Lower reject ratio
Challenges
Temperature monitoring during container glass gob cutting phase is critical. The glass strand gets cut as it exits through the feeder. Temperature of the molten glass needs to be maintained around 1000⁰C to ensure the cutting is done appropriately without defects to the gob.
The customer was facing a challenge with high reject ratio due to –
• Cracks in the container glass
• Thickness variation throughout the container glass
Furthermore, temperature monitoring with pyrometers gave only single point temperatures
Solution
Infrared cameras with a short wavelength and spectral response of 1 µm was ideally suited for the multipoint temperature measurement of the gob.
Feedback of temperature was used as a reference to increase or decrease the heat of the melting furnace.
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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