What are the surface drawing processes for aluminum alloy processing?

Brushed aluminum alloy surface can be made into straight lines, chaotic lines, threads, corrugations and swirls according to the needs of decoration. Straight line drawing refers to the processing of straight lines on the surface of an aluminum plate by mechanical friction. It has the dual function of brushing the surface scratches of the aluminum plate and decorating the surface of the aluminum plate. Aluminum alloy processing straight line drawing has two kinds of continuous silk and intermittent silk. The continuous silk pattern can be obtained by continuously scalding the surface of the aluminum product with a scouring pad or a stainless steel brush (for example, by manual grinding under the condition of a current device or by brushing the wire brush on the aluminum plate with a planer). By changing the wire diameter of the stainless steel brush, different thickness lines can be obtained. Intermittent silk threads are generally produced by processing on a brush or a grater. The principle of production: two sets of differential wheels rotating in the same direction, the upper group is a fast rotating grinding roller, the lower group is a slow rotating rubber roller, and the aluminum or aluminum alloy plate passes through the two sets of rollers and is brushed out. Delicate intermittent straight lines. Aluminum alloy processing chaotic drawing is a kind of irregular, no-grain matt silk pattern obtained by moving the aluminum plate back and forth, left and right and left under the high-speed running copper wire brush. This processing requires a high surface for the aluminum or aluminum alloy sheet. Corrugations are typically made on a lighter or a grater. Using the axial movement of the upper set of grinding rolls, the surface of the aluminum or aluminum alloy processing board is ground to obtain a wave pattern. Rotating, also known as optical rotation, is a kind of silk thread obtained by using a cylindrical felt or a stone nylon wheel mounted on a drill bed, using kerosene to adjust the polishing ointment, and rotating the surface of the aluminum or aluminum alloy after processing. It is mostly used for the decorative processing of circular signs and small decorative dials. The thread is made up of a small motor with a circular felt on the shaft, which is fixed on the table top, at an angle of about 60 degrees to the edge of the table, and a pallet with a fixed aluminum plate pressed tea, on the carriage. Apply a polyester film with a straight edge to limit thread competition. Using the rotation of the felt and the linear movement of the carriage, a thread of uniform width is spun on the surface of the aluminum plate.

Of course, it must be drawn after plating. It is usually flat brushed before bending or the like. In fact, the surface treatment has high requirements for the pretreatment of the substrate, otherwise the surface treatment is reversed to amplify the defects of the substrate. The surface drawing of the plastic parts is generally done by bronzing. Under the high temperature and high pressure of the bronzing machine, the substance on the bronzing film is transferred to the plastic surface. Different gilding films are used to obtain different gloss and thickness lines. This process is used in many DVD players. Nowadays, many magic mirror decorative parts used in audio-visual products are the surface of the reflective film (also used for electroplating) on ​​the PMMA sheet. In addition to the drawing, the sandblasting process is also used, which can also cover up. The effect of marking and beautifying the appearance is also a “hot stamping” process (aluminized aluminum transfer), which can also be applied to the surface of plastic parts.

1. Regarding the hot stamping plate, that is, the material of the pressing head part is selected, the red copper material is the best, because the red copper has good heat dissipation and heat transfer, and is neutral in the metal, which is not too soft. Not too hard, not only easy to process, has certain flexibility, and has good durability; however, in actual use, many manufacturers choose aluminum alloy printing plates to reduce material cost, so that the cost of ironing plate can be saved, but Because the aluminum material is too soft, the service life is poor. If the batch size is large, it has to be re-plated for a period of time, and the plate making fee is not cheap, so the material selection problem should be considered comprehensively; 2. The hot stamping process conditions are easier to understand. Is the hot stamping pressure, hot stamping temperature and hot stamping time; 3, the most important thing is the choice of hot stamping raw materials, that is, hot stamping paper, when choosing, pay attention to match with different hot stamping substrates, not a kind of hot stamping paper. All materials can be eaten, which is mainly related to the problem of adhesion fastness during thermal transfer.

This may be inconvenient to directly compare, because the two processes are different, the wire drawing is suitable for sheet metal parts, and the bronzing is suitable for paper, plastic, fabrics. If you want to compare, you must also consider the difference between the mold and the structural design. Other cost changes are justified. If you simply make a simple comparison, such as the drawing and bronzing cost of the above SONY panel, the drawing will be slightly cheaper. But I think other cost differences caused by material changes far exceed this cost. In the case of emphasizing the appearance, there are also wire drawing after plating, but the plating layer should be thick, the drawing depth should be controlled reasonably, of course, the cost is increased. . The surface of a typical aluminum alloy product is not electroplated, but is oxidized in various colors. Anodizing has been heard, for aluminum, it is mainly to strengthen the hardness of its surface (a layer of ceramic) to enhance the anti-friction performance. Asked if the die-cast aluminum parts can be surface-drawn, I have exactly this demand here. Anodizing and strengthening the hardness of the surface (a layer of ceramic), it is not a matter of enhancing the anti-friction performance. Hot stamping is also a thermal transfer one. Kind.

I have replied some simple introductions about water transfer in this post. Please refer to: Die-cast aluminum parts can be surface-brushed, and then sprayed with a protective film after drawing, it should be anti-oxidation. A layer of paint. Whether the die-cast aluminum parts can be surface oxidized to achieve a surface frosting and matt effect! Die castings can of course be surface oxidized. Surface matt can be done, but the effect of sanding is achieved by sandblasting. It is the pre-process of surface oxidation treatment. The sandblasting process is simple to introduce: sandblasting It is to obtain the surface of the film decoration or the fine reflective surface to meet the special design requirements such as gloss softness. At the same time, the combination of the print and the substrate can be made stronger when the silk screen is printed. Sand blasting is usually carried out in a dedicated blasting machine. According to the requirements of the thickness of the sand surface, the appropriate amount of quartz sand is selected and sprayed into a suitable sand surface. Uniform and moderate blasting can basically overcome the common defects of the aluminum surface. In fact, the plastic can be directly electroplated with brushed lines, and the effect of aluminum is almost the same. Now the surface of ordinary aluminum alloy products is not electroplated, but through various colors oxidized.

The surface of the aluminum alloy processed product is electroplated, and the various colors of the surface of the aluminum alloy product cannot be oxidized, and the pure aluminum product can be processed to pass various colors.

Post time: Oct-18-2019