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Sheet metal processing is sometimes used for sheet metal processing. Generally, some metal sheets are plastically deformed by hand or die to form a desired shape and size, and further complicated parts can be formed by welding or a small amount of machining. For example, chimneys commonly used in the home, iron stoves, and car shells are all sheet metal parts.
Sheet metal processing is called sheet metal processing. Specifically, for example, the use of sheet metal to make chimneys, iron drums, oil tank oil pots, ventilation ducts, elbow heads, funnels, etc., the main processes are shearing, bending, bending, bending, welding, riveting, etc. Certain geometric knowledge. Sheet metal parts are thin-plate hardware, that is, parts that can be processed by means of stamping, bending, stretching, etc. A general definition is a part with constant thickness during processing. Corresponding to casting parts, forging parts, Machining parts, such as the outer iron shell of the car is a sheet metal part, and some of the stainless steel cabinets are also sheet metal parts.
Usually, the three most important steps in sheet metal processing are shearing, punching/cutting, and folding.
1.1 The first step is the blanking (also called blanking) process. Usually, on-site workers will cut out the appropriate size of the part material from the large plate by the shearing machine according to the development map provided by the technical department. In the case of a punch, the dead zone of the clamp must be considered. After the blanking is completed, the worker will mark the item number with a marker on the surface of each piece of material.
Note: Some factories do not have this processing step, type directly on standard plates, and then directly punch/cut.
1.2 The material is then sent to a CNC punch/cutting machine for the punching/cutting process. In this process, you need to program the NC (Numerical Control) code for the part being machined. Most machine tool manufacturers now offer automatic programming software (almost all domestic manufacturers cooperate with foreign software companies for OEM sales, so they do not have their own software development team), which greatly facilitates programming engineers. The factors to be considered by the stamping/cutting programming engineer are sheet utilization, tooling, efficiency, and accuracy. After the stamping/cutting is completed, the parts are removed from the micro-join and then sent to the bender for bending.
1.3 In the bending process, the main considerations are tool selection, bending sequence, bending compensation, bending interference and so on. Usually, there are also bending programming software sold at random, but most CNC bending machines in China are still manually programmed, often relying too much on the experience of the master. On the other hand, the domestic manufacturing process requirements are still relative to foreign countries. The distance, so the efficiency has not improved, the performance of the CNC bending machine has not played to the extreme.
1.4 Finally, depending on the product, welding, grinding, painting, assembly, packaging, etc. may be carried out, and will not be described here.
2. Overall, in recent years, the sheet metal industry has developed rapidly. There are several reasons for this.
2.1 Increased production capacity requirements. China is increasingly becoming an international processing and manufacturing center. With the increasing investment in foreign countries, the demand for metal processing capacity is increasing. The electrical control boxes and machine casings in the metal processing industry are generally sheet metal parts. Demand for sheet metal processing capacity is also increasing.
2.2 The processing accuracy is low and easy to get started. As far as gold processing is concerned, precision is very common in a few lines, and the complexity of the process is relatively high, and even some parts have dozens of processes. Therefore, gold processing companies usually need a variety of mechanical equipment to meet different process requirements. The punching precision of sheet metal is generally about ±0.1mm, and the bending precision can generally reach ±0.5mm, so the precision is much lower than that of gold processing.
2.3 High profits. For example, stamping can reach about 30%, while laser cutting can reach 50% or more.