Sheet metal is a comprehensive cold working process for metal sheets (usually below 6mm), including shearing, punching/cutting/compounding, folding, riveting, splicing, forming, etc. Its notable feature is the uniform thickness of the same part. The basic equipment of sheet metal technology includes a shearing machine, CNC punching machine, laser, plasma, water jet cutting machine, bending machine, drilling machine, and various auxiliary equipment.
Sheet metal processing can quickly process aluminum alloy plates and cemented carbides and can cut without deformation no matter how high the hardness is. And its processing flexibility is very good, not only can process any kind of graphics but also can cut pipes and other strange-shaped materials. And most non-metallic materials can also be cut quickly and efficiently, so it will not be restricted by any material properties.
The most significant advantage of sheet metal processing technology is the fast cutting speed, and it will not be limited by the number of processing. But it is more suitable for the processing of special-shaped workpieces in the process of processing because it does not need to waste time to replace the tool, which effectively increases the processing speed; to a certain extent, its processing speed and maximum positioning speed are lower than the speed of wire cutting. Obviously much faster
Laser cutting in sheet metal processing belongs to non-contact cutting, and its cutting edge is affected by heat to a small degree, which can avoid the adverse effect of thermal deformation of the workpiece. Moreover, it can completely avoid the collapse of the material when the material is punched and cut. Generally, the cutting seam does not require secondary processing, which improves the work efficiency to a certain extent; not only that, its cutting head will not contact the material surface, thus Efficiently ensure that the workpiece is not scratched
Reason: In this case, there are generally the following situations: the thickness of the material is uneven, one end is thick, and the other end is thin. The mold wears unevenly, and the two ends are different in height. The middle block is not balanced and not at the same level.
Solution: feedback to laser or NCT to make it pay attention to the choice of material, replace the mold, or adjust the middle block.
1. The texture of the aluminum plate
When bending, you should bend according to the texture of the aluminum plate, not parallel bending, it is best to choose a straight direction.
2. The hardness of the aluminum plate
The hardness of the aluminum plate has a direct effect on the bending and cracking of the aluminum plate, and the hardness is too high to be the easiest to crack. Then when processing aluminum plates, you must choose a batch of high-quality aluminum materials. Check the quality of aluminum materials according to the product's trademark and product condition. Commonly used aluminum materials include 1 series and 3 series, and the ones with high hardness are The 6 series and 7 series need to be annealed before processing so that the aluminum plate can be bent in O state.
3. The angle of the R angle
When the R angle is bent, the larger the angle, the easier it is to bend, so the bending R angle should be as large as possible.
4. The thickness of the aluminum plate
The thickness of the aluminum plate is too thick and it is not easy to bend, so it is best to choose a thinner aluminum plate for processing.
5. Stretching aluminum sheet
The best processing procedure should be bending first, and then stretching, so as to reduce the probability of cracking.
For bending in sheet metal processing, the linearity standard is 0.3-0.5 mm.
Sheet metal processing reminds everyone in the bending process that bending tolerance is the allowable deviation of the actual parameter value. In addition, for tolerances, the formula is to determine geometric parameters so that they can be changed within a certain range to meet certain specific requirements
1. A rubber pad can be placed behind the shearing machine according to the length of the shearing machine, placed in an oblique position, and fixed to the two ends of the shearing machine so that the sheet metal processing parts will not be hurt when they fall down the surface.
2. After the laser material is formed, it should be placed on the stacking rack of the laser material, and placed according to the customer and the laser parts. Do not throw it on the floor of the sheet metal workshop at will. It can completely avoid the scratches and marks on the surface of the laser material; It should be covered with paper or rubber pads. At the same time, it needs to be wrapped around the frame in sheet metal models such as racks to avoid touching the corners during boarding or consignment.