I. definition of industrial aluminum
1) industrial aluminum profile, is a kind of alloy material with aluminum as the main component, aluminum bar through hot melt, extrusion to get different section shape of aluminum material, but the proportion of the alloy added to the different, the mechanical properties and application fields of the production of industrial aluminum profile are different.
2) the standard shall be GB/ t5237.1-2004.
3) generally speaking, industrial aluminum profiles refer to all aluminum profiles except those used for building doors and Windows, curtain walls, indoor and outdoor decoration and building structures.
Two, pay attention to extrusion industrial aluminum operating procedures and matters needing attention
The important problem of extrusion is the control of metal temperature, from the ingot heating to the quenching of extruded profiles to ensure that the soluble phase does not precipitate from the solid solution or present the dispersion precipitation of small particles.The heating temperature of 6063 alloy ingots is generally set within the temperature range of Mg2Si precipitation, and the heating time has an important influence on the precipitation of Mg2Si. Rapid heating can greatly reduce the possible precipitation time.Generally speaking, the heating temperature of the 6063 alloy ingot can be set as follows: unhomogenized ingot: 460-520℃;Homogenized ingot: 430-480℃.
Its extrusion temperature in the operation of different products and unit pressure to adjust the size.
(I) analyze the process first:
1. Before opening the aluminum extruder, there should be no sundries and oil stains around the equipment and on the machine.
2. Prepare the raw materials according to the production requirements and pour them into the tank according to the matching requirements.
3. Check the power supply and confirm that the control cabinet works normally.
(2) main engine of industrial aluminum extruder:
1. The drive and extrusion system is controlled by the main frequency converter to control the variable frequency speed-regulating motor, which is completed through the reduction box distribution box and the cross spline and passed to the screw step by step. The program and parameter values entered in the frequency converter have been set when the equipment left the factory and cannot be changed at will.
2, heating, cooling system, is by the barrel, die heating, cooling/heating screw core to form, the cooling/heating by electric cavity program to control, by the B&R temperature module with PID temperature control software to replace traditional temperature control table, the system can automatically optimize calculus PID parameters in the process of heating, calculus after the completion of the assignment automatically, can also according to own experience to manually to the assignment of PID parameters, the temperature control to - ℃.
The working principle is that a temperature value such as 180℃ is given in each heating section and the data is measured by thermocouple.As the temperature increases, the heating frequency decreases and the heating time decreases. When the temperature is ≥180℃, the area begins to cool down and the fan begins to work.(cooling is divided into air cooling and oil cooling.) when the temperature is less than or equal to 180℃, heating begins again.Core temperature is the same truth, is the set temperature is relatively low at about 80 ℃, and is heat transfer by heat conduction medium, when the temperature of 80 ℃ or less core temperature heating tube heating work, through the heat pump cycle to provide screw, when the temperature of 80 ℃ or higher cooler water solenoid valve is opened, the oil by cooler is cooled by oil pump cycle to take screw in excess heat.On the basis of automatic control of the second, third and fourth regions of the cylinder and the core temperature, there is also a manual forced cooling function to control the instantaneous temperature increase.
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