Electromagnetic strip stabilizer was awarded the 2009 excellent invention prize by the Chief Secretary of patent office in Japanese government.
On September 25, 2009, our electromagnetic strip stabilizer won the award of excellent invention prize by Japanese patent office. The award admires the high superiority of this device in realizing high efficient operation at CGL by continuous and stable vibration reduction control for the strip, applying electromagnetic technology. This is the first time to win the same award since our company establishment in 1917.
Auto makers and home appliance manufacturers use pressing processes
to shape steel sheet into cabinets and other components for their products.
After being hot rolled and cold rolled, the steel sheet passes through
other processing lines for galvanizing, painting, and washing. Our electromagnetic
strip stabilizer controls C-wrapping and vibration that would otherwise
occur as the steel sheet moves at high speed between the rollers of
these processing lines. As a result, galvanized or paint layers can
be applied with a more uniform thickness, making it possible to press
the sheet more precisely, beautifully, and efficiently, while conserving
galvanizing materials and paint. The electromagnetic strip stabilizer
features our exclusive mineral insulation material that can withstand
temperatures up to 300_C, making it suitable for Class C applications.
Operation is therefore possible at high temperatures using air cooling.
- Reduces Steel Sheet C-wrapping and Vibration in Galvanizing and Painting Lines
- Japan's First Electromagnetic strip stabilizer for Steel Sheet for Class C Operations
Features of our electromagnetic strip stabilizer for Steel
Non-Contact Pass-Line Straightening
The electromagnetic strip stabilizer places an electromagnet
strategically near the surface of the steel sheet that is passing through
the rollers. C-wrapping and vibration are detected by a sensor, which
activates the magnet to keep the sheet flat and vibration-free. The
electromagnetic strip stabilizer consists of an electromagnet, an eddy-current
type displacement sensor, a control unit, and a power unit. This simple
design realizes reliable operation of our electromagnetic strip stabilizer
and makes our electromagnetic strip stabilizer very easy to be maintained.
|Figure 1. Mechanism of electromagnetic strip stabilizer
||Figure 2. Configuration Example of electromagnetic
|In a molten zinc galvanizing line, steel sheet is passed through
a high-temperature (420_C or higher) solution of molten zinc
alloy at a fast speed of 2 00m/min. Although rollers above
and below apply tension as the sheet passes, C-wrapping does occur as
the central part of the sheet expands outward (C war page). Also, pressurized
air from the wiping nozzle imparts a small amount of vibration. This
C-wrapping and vibration cause the zinc layer to be applied unevenly,
making it harder to control the thickness of the galvanized
layer as compared with electroplating. Actual variations in thickness
will differ depending on the type of steel sheet and the processing
conditions. In the case of C-wrapping, for example, wrapping of ±4mm
can be expected in 0.5mm-thick steel sheet passing through the line
at a speed of 200m/min. SINFONIA TECHNOLOGY CO., LTD.’S electromagnetic strip stabilizer installed, however, C-wrapping in this case is reduced to
within x1mm. In addition, the electromagnetic strip stabilizer has a
stabilizing effect that reduces vibration.
Figure 3. Performance Examples of
electromagnetic strip stabilizer
Figure 4. Examples of C-wrapping Correction Capabilities for electromagnetic strip stabilizer
High-Response Circuit Ensures Excellent Control
The eddy-current type displacement sensor of our electromagnetic
strip stabilizer is installed in the center of the electromagnet units
to ensure accurate detection of the steel sheet's condition and provide
highly stable performance. Capable of analyzing variations as small
as 1/100mm, the sensor provides excellent responsiveness and precision.
The molten zinc alloy used in molten galvanizing lines
is nearly 420_C. For electromagnetic strip stabilizer to function
under such hot conditions, its heat-resistant electromagnet units
must be cooled. our electromagnetic strip stabilizer is the first
of its kind to be capable of Class C operation. Compared with conventional
Class H magnets, Class C magnets have a wider range of rated current,
which makes it possible for them withstand higher temperatures. They
can also be air-cooled, making simpler, safer construction possible. Features of our Class C Electromagnet units
Resource Conservation, Easy Maintenance
A more uniform galvanized layer saves resources, and thus
reduces costs, by preventing the application of excessively thick
coatings. Air cooling system is applied for our electromagnetic strip
stabilizer, which is safer than water cooling and contributes to a
simpler, more compact design that makes our electromagnetic strip
stabilizer easier to be maintained.
For more detailed relating to our electromagnetic strip stabilizer,
please send us e-mail or contact us at the following address.
SINFONIA TECHNOLOGY CO., LTD.
Shiba NBF Tower, 1-30, shiba-daimon 1-chome, Minato-ku, Tokyo,