Sheet metal processing is sometimes used to pull gold. The word comes from English plate metal. Generally, some metal sheets are pressed by hand or die to produce plastic deformation, to form the desired shape and size, and further more complex parts can be formed by welding or a small amount of machining, such as chimneys commonly used in families, tin furnaces, and automobile casings are all sheet metal. Pieces.

Sheet metal processing is called sheet metal processing. For example, the use of plates to make chimneys, iron buckets, oil tanks, ventilation pipes, elbows, Tianyuan places, funnel-shaped, etc. the main process is cutting, bending, forming, welding, riveting, etc., which requires certain geometric knowledge. Sheet metal parts are sheet metal parts, which can be processed by stamping, bending, stretching and other means. A general definition is the parts with constant thickness in the process of processing. The corresponding parts are casting parts, forging parts, machining parts, etc. for example, the iron shell outside the car is sheet metal parts, and some cabinets made of stainless steel are sheet metal parts.

Generally, the most important three steps of sheet metal processing are cutting, punching / cutting and folding.

1.1 the first step is the blanking (also known as blanking) process. In general, the field workers will cut the appropriate size of parts and materials from the large plates through the shearing machine according to the development drawing provided by the technical department. In case of press, the dead zone of clamp must be considered. After blanking, workers will mark the material number on the surface of each piece of material with a marking pen.

Note: there are also some factories that do not have this processing step, directly typesetting on the standard plate, and then directly stamping / cutting processing.

1.2 the material will then be sent to the CNC punch / cutter for punching / cutting process. In this operation, NC (numerical control) code shall be prepared for the processed parts. Now most machine tool manufacturers will provide automatic programming software (almost all domestic manufacturers cooperate with foreign software companies for OEM sales, so they do not have their own software R & D team), which greatly facilitates programming engineers. The factors to be considered by the stamping / cutting programming engineer are sheet utilization, cutting tools, efficiency, accuracy, etc. After stamping / cutting, the part is removed from the micro connection and then sent to the bending machine for bending.

1.3 in the bending process, the main considerations are tool selection, bending sequence, bending compensation, bending interference, etc. Generally, bending programming software will be sold randomly, but most of the CNC bending machines in China are still manually programmed, often relying too much on the experience of teachers and Fu. On the other hand, the domestic manufacturing process requirements have a certain distance compared with the foreign ones, so the efficiency has not been improved, and the performance of the CNC bending machine has not been brought into full play.

1.4 finally, according to the product situation, welding, grinding, painting, assembly, packaging and other processes may be carried out, which will not be described here one by one.

As a whole, in recent years, sheet metal industry has developed rapidly. There are several reasons for this.

2.1 increase of production capacity demand. China is becoming more and more an international processing and manufacturing center. With the increasing foreign investment, the demand for metal processing capacity is increasing. In the metal processing industry, electrical control boxes, machine casings, etc. are generally sheet metal parts, so the demand for sheet metal processing capacity is also increasing.

2.2 the machining accuracy is low and easy to use. In terms of gold processing, precision is very common in several wires, and the complexity of the process is also relatively high, and even some parts have dozens of processes. Therefore, gold processing enterprises usually need a variety of mechanical equipment to meet different process requirements. The punching accuracy of sheet metal is generally about ± 0.1mm, and the bending accuracy is generally ± 0.5mm, so the accuracy is much lower than that of metal processing.

2.3 high profit. Such as stamping can generally reach about 30%, and laser cutting can reach 50% or more.