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Drawing die processing technology description
Drawing treatment is to be done after stamping. Drawing can be made into straight lines, random lines, threads, ripples and spiral lines according to decorative needs.
Straight drawing refers to machining straight lines on the surface of aluminum plate by mechanical friction. It has the dual function of brushing and removing scratches on the surface of the aluminum plate and decorating the surface of the aluminum plate. There are two kinds of straight drawing: continuous silk and broken silk. Continuous silk can be obtained by cleaning cloth or stainless steel brush through continuous horizontal linear friction on the surface of the aluminum plate (such as manual grinding or grinding on the aluminum plate with a planer clamping wire brush). Change the diameter of stainless steel brush wire, can obtain different thickness of grain. Broken silk is usually processed in a brushing machine or an erasing machine. Production principle: two sets of differential wheels rotating in the same direction are adopted. The upper set is a fast rotating grinding roller, and the lower set is a slow rotating rubber roller. The aluminum or aluminum alloy plate passes through the two sets of roller, and is brushed with delicate intermittent straight lines.
Random wire drawing is a kind of irregular matte silk without obvious lines, which is obtained by the friction of the aluminum plate moving around and around under the copper wire brush at high speed. This kind of processing, the surface of aluminum or aluminum alloy plate requirements are higher.
Corrugation is generally made in the brushing machine or wiping machine. By using the axial motion of the upper grinding roller, the surface of the aluminum or aluminum alloy plate is rubbed and the wavy pattern is obtained.
Spiral grain, also known as optical rotation, is a kind of silk grain obtained by rotating polishing on the surface of aluminum or aluminum alloy plate by using cylindrical felt or stone grinding nylon wheel mounted on a drilling machine, mixed with kerosene and polishing ointment. It is used for circular signs and small decorative dial decorative processing.
Thread is to use a small motor equipped with circular felt on the shaft, it is fixed on the table, and the table edge at an Angle of about 60 degrees, in addition to make a fixed aluminum plate press tea, on the drag plate affixed with a straight polyester film to limit the thread race. By using the rotation of felt and the straight line movement of the drag plate, the thread lines of the same width are created on the surface of the aluminum plate.
Sandblasting is done to obtain a film light finish or a slightly reflective surface to meet special design needs such as soft gloss. Uniform and moderate sandblasting treatment can basically overcome the common defects on the surface of aluminum.
For the appearance of parts, whether with wire drawing or sand blasting, usually need to do surface oxidation treatment. As for the choice of what kind of processing technology, should be related to modeling to consider a problem, two kinds of technology can obtain the surface texture or difference.
In addition, there is a process close to sand blasting, but it is carried out by a chemical corrosion method, commonly known as chemical sand rotten treatment or chemical sand surface corrosion, especially for aluminum surface treatment, the uniformity of the sand surface is far better than sand blasting treatment. Chemical sand surface corrosion can be divided into acidic corrosion and alkaline corrosion. Different surface color and sand thickness can be obtained by different etching solvent and sand surface agent.
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