Accurate Sensor Technologies, has introduced a unique line of proprietary pyrometers that use new approach for remote temperature measurement. These proprietary pyrometers provide highly accurate, non-contact measurement of true target temperatures, regardless of target emissivity and intermediate conditions.
Unlike other pyrometers, these products are not sensitive to changes in emissivity or other target
parameters and are not affected by the intermediate conditions between the pyrometer and the target. As a result, AST/3Ts pyrometers are the only products available today capable of handling the unstable targets and intermediate conditions commonly found in the aluminum, steel and other metals industries while still indicating the target temperature to a high degree of accuracy.
Advantages Of Using AST Systems For Measuring Precise Temperatures In Aluminum
1. Productivity –Allows for increased extrusion speed;
2. Quality – Better profiles reduce amount of scrap produced;
3. Energy – Saves gas or electricity at the die furnace, billet furnace and container electrical element.
Installation Locations For AST/3T Pyrometers On Aluminum Extrusion Lines
There are three locations where the AST pyrometer can be placed:
A. Press Exit
B. Billet Furnace Exit OR before the Billet Loader
C. On the Extrusion Cooling Table
By measuring the temperature of aluminum profiles at the press exit the following advantages can be
INCREASED PRESS SPEED – As extrusion speed is increased productivity is increased. For example, if
aluminum profiles are usually extruded at a low temperature of 520°C and the extrusion temperature
is increased to 560°C, the extrusion press speed can be dramatically increased.
Customers report increased productivity rates of 5 - 10% .
QUALITY – Emissivity is a surface parameter with a value between 0 to 1. Low emissivity leads to a
mirror profile surface. When low emissivity is maintained, the surface quality is higher. 3Ts systems
provide a display showing the emissivity of each profile, resulting in better profiles.
When profiles are extruded at very high temperatures, for example between 580°C to 600°C, product
may be damaged. 3T pyrometers can prevent this damage.
IDEAL EXTRUSION – is accomplished by using the maximum temperature, the optimal pressing speed
and minimum emissivity.
a. To achieve Ideal Extrusion collect following data from each extrusion:
1) Press speed
2) Temperature 3) Emissivity 4) Quantity per hour
b. Data can be collected:
1) Manually: from controller display
2) By chart recorder: 0 - 10V from 3Ts controller
3) By computer: from 3Ts controller (RS 232 or RS 485 compatible).
c. The data is analyzed and, based on this information, instructions regarding the optimal press speed are given to the press operator. Using AST pyrometers, a press operator can use the information obtained, along with his experience, to achieve the best extrusion process possible. COMBINED CLOSED LOOP CONTROL – AST'S controller signals can be combined with a closed loop control system allowing for the automatic control of press speed.
B. BILLET FURNACE EXIT By measuring the temperature of aluminum profiles at the billet furnace exit or positioned before the billet loader the following advantages can be achieved: Prevents A Hot Or Cold Billet From Entering The Press: A hot billet damages the profile resulting in a low quality. A cold billet causes maintenance problems. Better control of the billet furnace temperature allows for improved control of the furnace.
QUALITY – The emissivity measurement provides the user with a parameter for controlling the quality of the billet.
PRODUCTIVITY – Control of the profile temperature assists in increasing productivity. ENERGY – Billet temperature control can result in energy savings at the billet furnace.
C. AT THE COOLING TABLE By measuring the temperature of aluminum profiles at the cooling table where profile temperatures range between 200°C - 230°C the following advantages can be achieved: IMPROVED MECHANICAL PROPERTIES RESULT IN BETTER QUALITY. Profiles must be cooled with precise timing. VENTILATION UNITS CAN BE CONTROLLED WITH THE 3T PYROMETER.
We recommend to adopt all three applications in order to achieve temperature control and an isothermal extrusion process. Remember if you wish to join the superextruders, who always have time enough to make profit, begin by concentrating on three things:
First - Temperature Second - Temperature Third - Temperature