The Modern Chinese Dictionary (5th Edition) explains - Sheet metal: verb, to process sheet metal such as steel plate, aluminum plate, copper plate.
Sheet metal parts under the way of laser cutting, punching, shearing, etc., to the factory equipment laser machine and punching machine under the example of cutting or punching, the side of the sheet towards the bottom of the processed side will have a small burr, not smooth. The positive side is also known as the smooth side, and the negative side is also known as the rough side, the side with burrs.
This problem is more obvious when the laser machine cuts the aluminum plate and the punch press punches it. If you sand one piece at a time before bending, it is time-consuming and laborious. If you don't sand it, and then the rough side gets folded to the outside when bending, it affects the aesthetics.
Therefore, when unfolding, unfold from the back of the part and look at it squarely, and when unfolded, it will be the front side, and the rough surface will be folded to the inside when bending, so that the burr will be covered, and it will not affect the aesthetics. When each part is unfolded in this way, there is another great advantage such as she is sheet metal processing before determining the direction of bending to save time and effort.
Expanded
Sheet metal has a light weight, high strength, conductive (able to be used for electromagnetic shielding), low cost, good performance of large-scale mass production, etc., in the field of electronic and electrical appliances, communications, automotive industry, medical equipment and other fields have been widely used, for example, in the computer chassis, cell phones, MP3, sheet metal is an essential component.
With the increasing application of sheet metal, the design of sheet metal parts has become a very important part of the product development process, mechanical engineers must be skilled in the design of sheet metal parts, making the design of the sheet metal to meet the functionality and appearance of the product and other requirements, but also to make the stamping die manufacturing is simple and low-cost.