The aluminum bar is preheated before entering the extruder. Traditionally, bars may have to heat solution temperature and aluminum coil in the furnace, but experience shows that it is still uncertain. As long as the aluminum bar is cast correctly and evenly, it is not necessary to reach the solution temperature in the preheating furnace.
The aluminum bar is preheated before entering the extruder. The traditional idea, maybe, is that the bar in the furnace must be heated to the solution temperature, ? but experience shows that it is still uncertain. As long as the proper casting and homogenization, it is not necessary to reach the solution temperature in the preheating furnace. The only purpose of the aluminium bar furnace is to soften the metal, not to be produced in modern aluminium extrusion plants. If the sales of aluminum coil by metal heating is not enough, the sales calculation formula of aluminum coil can not pass the mold smoothly. If the aluminum bar is to be released effectively, the extrusion speed must be very low.
Typical problems of temperature measurement in preheating zone of aluminum bar are as follows:
1. Two point thermocouple reading will be low
2. Routine maintenance of two-point thermocouple is often ignored
3. Homogenization heat treatment temperature is the key parameter of aluminum bar
4. The operator is easy to overheat the aluminum bar
5. The operator tends to reduce the extrusion speed to fine tune the temperature change of aluminum bar during extrusion
6. Excessive heating and slow extrusion waste preheating energy
The bar shall be heated to the minimum temperature at which it can be extruded. The coil sales specification must also ensure that the extruder outlet temperature reaches the target value. By reducing the preheating temperature of the aluminum bar, the extrusion speed can be increased, and the sales price of the aluminum coil can reduce the energy consumption of the heating furnace. The practice shows that the change of economic data can save 15-20% energy consumption of gas heating furnace.
Aiming at the imported cheap products of gas heating furnace, the temperature range of aluminum bar is measured by two-point thermocouple. Because of the high maintenance requirements of this instrument, v. the advantages of using this instrument itself, or very expensive maintenance aluminum sales, aluminum sales test report or loss of accuracy. Some aluminum profile factories have begun to use non-contact sensors to detect and control the temperature of the heating section of aluminum profile. It not only reduces the dependence on contact thermocouple thermometers, but also reduces the maintenance problems due to the limitations and accuracy of the instrument itself.
In the induction heating furnace system, the infrared temperature sensor directly aims at the surface of the aluminum bar to guide the force, the seventh can directly understand the temperature "generation and propulsion", and the fourth can reduce the inconsistency of the use of two-point thermocouples. Similarly, for the gas water heater, the sensor can be installed at the furnace outlet (extrusion pipe inlet) to understand the surface temperature of the aluminum bar. II is also used for the correct temperature thermocouple or infrared thermometer temperature deviation in the furnace. Aluminum bar temperature measurement part of the bar is the most ideal location, Ⅵ check the soaking temperature. The temperature of the side should also be measured, because this side will contact the mold first.
For the gradient heating aluminum strip, a sensor can be installed on one side of the aluminum strip conveyor belt to understand the sales temperature of the aluminum roll, or two sensors can be installed to measure the temperature at both ends of the aluminum strip. Accurate gradient heating temperature is very important for the continuous transportation of aluminum bars to the extruder. Inaccurate temperature measurement will make gradient heating meaningless.
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