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.
3. The automatic feeding system is controlled by the time relay or the level meter to transmit signals. When the level meter transmits signals in case of shortage of materials, the system begins to feed materials.
4, feeding system, is also by the inverter control frequency control cycloidal needle wheel reducer to achieve, the proportion according to the main machine screw speed to adjust, the main machine current and torque are directly affected by the amount of feed, feed less, the main machine current and torque reduction.And vice versa.When the feed is too much, the actual current exceeds its rated current or the torque exceeds its set value, the main machine will stop with an overload alarm, generally controlled at 50%~80% of the rated value.
5. The vacuum exhaust system is completed by directly controlling the vacuum pump with the button. The solenoid valve is opened when the vacuum is opened, and then closed when the solenoid valve is closed.
For industrial aluminum extruder products are their own design parameters, such as extrusion weight, extrusion volume, extrusion metal, do not exceed the product design parameters in the extrusion work.
For the transmission of industrial aluminum extruder itself to pay attention to the difference between single screw and double screw industrial aluminum extruder, do not use in disorder, otherwise it is easy to cause irreversible failure of industrial aluminum extruder products.
3) operation rules for industrial aluminum extruders:
1. Check whether the oil pressure system is leaking and whether the air pressure is normal.
2. Check whether the transmission belt, cold bed and material storage platform are damaged or scraped.
3, before stretching to confirm the length of the aluminum profile, and then determine the tensile rate, determine the tensile length, that is, the main chuck moving position, usually 6063T5 tensile rate is 0.5%--1%, 6061T6 tensile rate is 0.8%--1.5%.
4, according to the shape of the aluminum profile to confirm the clamping method, large section hollow profile, can be inserted into the stretch pad, but to ensure enough clamping area.
5. When the aluminum profile is cooled to below 50℃, open energy stretch profile.
6, when the profile bending and twisting at the same time, should be corrected after twisting and bending.
7. One or two roots should be tested to confirm whether the predetermined tensile rate and clamping method are suitable.Visual bending, twisting, check the profile of the plane clearance, flaring, parallel, if not suitable, to adjust the tensile rate.
8. If the normal tensile ratio still cannot eliminate bending, twisting, or make the geometric dimension qualified, the operator should be informed to stop squeezing.
9. The profiles on the cooling table shall not rub, collide, overlap and pile up to prevent rubbing.
Industrial aluminum extrusion machine work efficiency high and low and use lifespan and industrial aluminum extrusion machine installation sequence has a lot to do, general industrial aluminium extrusion machine equipment foundation, in addition to withstand the device itself weight and production with the raw material weight, but also bear the dynamic load effect when the work extrusion machine, so the equipment installation must be carried out in accordance with the corresponding installation program.
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