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ã€China Aluminum Network】The production of jigs and the selection of feeding methods. Fixtures hung at both ends should ensure that they can withstand considerable weight pressure; the clamps used in the middle should minimize the size of the contact points between the fixtures and the outer surfaces of the profiles, and be placed in a vertical position in time. Make up powder on the pole.
The hanging position in the hanger of the aluminum alloy profile should also follow the corresponding principle. For some deep grooved profiles, increasing the amount of powder and pushing the distance between the sprayer and the profile are all applicable; the surface with large surface area or complicated structure should not be placed in the downward position, and the decoration of the profile should be distinguished at the same time. Surface and non-decorative surface.
For some aluminum alloy profiles with special shapes, the position of the fixture is timely adjusted so that the aluminum alloy profile maintains a certain tilt angle at the position of the rack to enhance the smoothness during operation and facilitates powder adsorption.
In addition, for some heavier sections in the use of the middle position of the fixture, the elbow part should have a certain degree of curvature, the curvature of the fixture can ensure that the aluminum alloy section in the vertical position, to ensure the smooth production process.
In addition, with the increase in the number of cycles of conductive beams and hangers, the coating film will accumulate. The coating film itself is non-conductive, which will affect the conductivity of the conductive beam and the hanger, thereby affecting the uniform distribution of the powder on the surface of the aluminum alloy profile. The coating film on the conductive beam and hanger should be selected in an appropriate manner for removal.
The pre-treatment process is simpler than the ordinary pre-oxidation pre-treatment process, mainly for degreasing and chromizing. The raw material consumption is relatively low, and routine maintenance work is relatively easy.
During the pre-treatment process, in order to increase the production efficiency and reduce the energy consumption during the drying process, larger racks are used, and as many profiles as possible are loaded. For some aluminum alloy sections with soft texture, crossbars should be placed in the middle of the aluminum alloy sections so that the grooves can be placed as far upwards as possible to facilitate the evaporation of moisture.
After the drying process is finished, if there is still moisture remaining, in order to avoid damage to the surface of the aluminum alloy profile and deformation of the profile when the temperature is too high, it should not be baked in the furnace, can be used to dry or Air gun (without oil and gas) to dry.
In addition, the profiles must be kept at proper tilting angles when entering and exiting the troughs, but it is easy to cause some of the profiles to fall off. A stainless steel wire mesh should be used as a preventive measure at one end of the rack.
Spraying room should pay attention to the problem: before the official spray, you can try to spray several times, then you can observe the size of the powder at both ends of the spray booth and the uniformity of powder distribution. The powder at this time runs in a straight line within 10 cm from the tip of the spray finger. The external part is in the form of atomized powder. The powder that is adsorbed on the surface of the profile is actually the powder of this atomization effect. Is there such atomization? The effect of the powder is as a standard for controlling the distance between the finger and the profile.
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