Aluminum alloy surface drawing process
Aluminum alloy surface can be drawn according to the needs of the decoration, made straight lines, chaos lines, threads, corrugated and swirling lines and so on.
Straight-line drawing refers to machining straight lines on the surface of aluminum alloys by mechanical rubbing. It has the dual role of brushing aluminum alloy surface scratches and decorative aluminum plate surface. There are two kinds of continuous wire drawing and intermittent wire drawing. The continuous thread can be obtained by using a scouring pad or a stainless steel brush by continuously horizontally rubbing the surface of the aluminum plate (for example, hand grinding with an existing device or grinding the brush with a planer on a aluminum plate). Change the wire diameter of the stainless steel brush to obtain different thickness lines. Intermittent thread is generally processed on a brush or a squeegee. The principle of making: adopts two sets of differential rotating wheels that rotate in the same direction. The upper set is a roller that rotates rapidly. The lower set is a roller that rotates slowly. The aluminum or aluminum alloy plate passes through two sets of rollers and is brushed out. Delicate, intermittent lines.
Random pattern drawing is a kind of irregular matt silk pattern with no visible lines obtained by moving the aluminum plate forward and backward and left and right under the high-speed copper wire brush. This kind of processing requires high surface quality for aluminum or aluminum alloy plates.
Ripples are usually made on a brush or a scribing machine. Using the axial movement of the upper set of grinding rollers, the aluminum alloy surface was brushed to obtain a wave pattern.
Spinning, also known as rotation, is the use of cylindrical felt or grinding stone nylon wheel mounted on the drill, with kerosene and polishing paste polishing, aluminum or aluminum alloy plate surface rotation grinding and grinding a silk pattern obtained. It is mostly used for decorative processing of round signs and small decorative dials.
The thread is a small motor equipped with a round felt on the shaft, which is fixed on the table, and is at an angle of about 60 degrees with the edge of the table, and a dragging plate with a fixed aluminum plate for pressing tea is made on the drag plate. A polyester film with straight edges is used to limit the thread race. With the rotation of the felt and the linear movement of the carriage, a thread pattern with the same width is spirally wound on the surface of the aluminum plate.
Of course, after plating, it must be drawn first.
Before the bending and other molding, it is generally a flat wire drawing. In fact, the surface treatment has a high requirement for the pre-treatment of the substrate, otherwise, the surface treatment will in turn amplify the defect 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 materials on the bronzing film are transferred to the plastic surface. Different gilding films are used to obtain different luster and thickness lines. This process is used on many DVD panels. Nowadays, many of the magic mirror decoration parts used in audiovisual products are reflective film (also useful for electroplating) on the surface of PMMA sheet. In addition to wire drawing, the surface treatment of aluminum is also commonly used in sand-blasting, which can also cover masking. The role of marks and beautification appearance There is also a "hot stamping" process (aluminum transfer) that can produce similar effects on the surface of plastic parts.
Regarding the hot stamping plate, that is, the material selection of the pressure head part, the red copper material is the best, because the red copper has better heat dissipation and heat transfer, and is a neutral material in the metal, which is neither too soft nor too light. Hard, not only easy to process, there is a certain degree of elasticity, durability is good; but in actual use, many manufacturers choose aluminum alloy printing plates to reduce the cost of materials, so that the production cost of hot plate can save some, but because of aluminum The material is too soft and its service life is poor. If the batch is large, it will take a period of time to re-plate, and the plate-making fee is not cheap. Therefore, the material selection problem should be considered comprehensively.
