來源：http://www.fuzore.com 發布時間：2019-08-16 15:56:36
Aluminum rods should be preheated before entering the extruder. Traditionally, bars may have to heat solution temperatures and aluminium coils in ovens, but experience has shown that it is not yet certain. Aluminum rod preheater does not need to reach solution temperature, as long as the aluminium rod is properly poured uniformly.
Aluminum rods should be preheated before entering the extruder. Traditionally, bars in ovens may have to be heated to solid solution temperatures and_, but experience has shown that it is not yet certain. As long as the bar is cast correctly and evenly, the solution temperature in the bar preheater does not need to be reached. In modern aluminium extrusion equipment, the sole purpose of @aluminium bar furnace is to soften metals. If the metal heating is not enough to sell the aluminum coil, the sales calculation formula of the aluminum coil will not pass through the die smoothly. If the aluminium rod is heated to overheat, the extrusion speed must be very low.
Typical problems of temperature measurement in aluminium bar preheating zone are as follows:
1. Two-point thermocouple readings will be very low
2. Daily maintenance of two-point thermocouples is often neglected.
3. Homogenization heat treatment temperature is the key parameter of aluminium bar
4. Operators can easily overheat aluminium rods.
5. Operators tend to fine-tune the temperature change of aluminium rods during extrusion by reducing extrusion speed.
6. Overheating and Slow Extrusion Waste Preheating Energy
Aluminum bars should be heated to the lowest extrudable temperature, and the sales specifications of aluminium coils must ensure that the extruder outlet temperature reaches the target value. By reducing the preheating temperature of aluminium rod, the extrusion speed can be increased, and how to increase the selling price of aluminium quantity can reduce the energy consumption of heating furnace. Practice has proved that the economic data show that this transformation can save 15-20% of the energy consumption of gas heating furnace.
For cheap imported gas heater, two-point thermocouple is used to measure the interval temperature of aluminium rod. Because of the high maintenance requirements of this instrument, V uses the advantages of this instrument itself, or very expensive maintenance of the sales of aluminium coil, aluminium coil sales test report or loss of accuracy. Some aluminium extrusion plants have begun to use non-contact sensors to detect and control the temperature of the heating section of aluminium bars. It not only reduces the dependence on the thermocouple thermometer, _, 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 aligns with the direct force on the surface of the aluminium rod, VII can directly understand the temperature "jacking", thus reducing the inconsistency in the use of the two-point thermocouple. Similarly, for gas water heaters, sensors can be installed at the furnace outlet (extrusion tube inlet) to understand the surface temperature of aluminium rods. II is also used for correct temperature deviation of thermocouples or infrared thermometers in the furnace. Aluminum bar temperature measurement part of the bar is the ideal location, VI check the soaking section temperature. The temperature of the side is also measured because this side will contact the die first.
For gradient heated aluminium rods, a sensor can be installed on one side of the aluminium rod conveyor belt to understand the sales temperature of the aluminium coil, and two sensors can be installed to measure the temperature of the two sections of the aluminium rod. Accurate gradient heating temperature is essential for continuous entry of aluminium rods into the extruder. Incorrect temperature measurements can make gradient heating meaningless.
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