1. Flat pressure sanding belt drawing:
Flat pressure drawing is a common drawing method, in which the workpiece is fixed on the mold, and the grinding sand belt works at high speed. There is a pneumatic controlled pressure block on the back of the sand belt that can move up and down. After being pressed down, the sand belt is attached to the surface being processed for drawing. The commonly used equipment is a flat press sand belt machine.
Flat pressure drawing is suitable for drawing small flat surfaces, such as drawing widely used in digital camera casings, mobile phone casings, and so on. This type of brushed surface treatment usually involves straight threads that are connected in a continuous pattern. Due to the use of sand belts, there is a wide range of particle size selection, which allows for the use of coarse-grained sand belts to produce rough and noticeable tactile lines, as well as the supply of pyramid series sand belts and non-woven nylon sand belts that are more suitable for wire drawing. The sanding belt will generate a lot of heat when grinding and drawing the entire surface, and there is a problem of stress concentration on the drawing side of the workpiece, especially for thin-walled parts that may experience warping and deformation. So this method is suitable for small area wire drawing processing. Because it is a downward pressure operation, it is generally used on flat surfaces and there should be no protrusions on the surface, such as protruding text markings. However, through the wonderful planning of molds such as pressing blocks, it is also possible to draw slightly curved workpieces. The detailed method should be commented on in detail depending on the degree of twists and turns.
2. Wide sand belt drawing:
This drawing method is the most traditional drawing method, used for flat drawing and particularly suitable for sheet metal processing. The sand belt rotates at high speed, and the sheet is polished and drawn by the conveyor belt through the sand belt. Generally, stainless steel sheets, aluminum alloy sheets and other sheets are made into semi-finished drawn products for further production into products made of sheet materials, such as stainless steel elevator drawn door panels, stainless steel cargo platforms, aluminum alloy chassis, etc. The lines drawn by this method are usually very thin and short-lived, and can be called snow patterns. This method requires good adhesion of the sanding belt, and the line effect of the board can be more uniform. 3M's non-woven sanding belts have excellent adhesion compared to traditional coated sanding belts.
3. Heartless grinding and drawing:
This is the method of using centerless grinding for wire drawing. The grinding products used are non-woven wire drawing wheels or sand belts. Suitable for cylindrical workpieces, such as handles and grippers. The lines drawn by this method are generally short lines, and the length of the lines is related to the rotation speed of the workpiece, the rotation speed of the ground product, and the ground product itself.

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