1. Sheet metal fabrication technology classification
Sheet metal parts according to different requirements to choose different ways of blanking, including laser shear, CNC plasma cutting, shearing machine processing and other different ways.Usually from the cost consideration most will use the plate shearing machine shearing processing.In order to ensure the shearing quality, according to the thickness of the plate, the gap between the blade of the plate shearing machine should be adjusted, otherwise the plate will have rough edges, and the blade should be regularly polished, one is to increase the service life of the cutter, the other is to ensure the shearing quality of the plate.Laser shearing because its numerical control program is by CAD graphics - geometric bitmap based on non-uniform rational B-spline curve PLC control program synchronous conversion, mechanical accuracy of theoretical error in ±0.02mm, due to environmental reasons in fact error in ±0.05mm, material utilization rate is usually ≥80%.The use of laser cutting, cutting out the dimensions of the parts, precision, roughness, heat affected zone are fully in line with the design requirements.CNC plasma cutting, general nc cutter in cutting needs to be done before drawing and editing and processing of cutting process, to ensure the quality of artifacts, are usually not directly on workpiece contour point arrangement penetration (strike), but to make it to leave a distance, workpiece after a period of cutting line and then into the workpiece contour, the lines are usually called cutting lead or lead.In general, the length of the lead increases as the thickness increases.
2. Sheet metal fabrication process points of attention
The post-processing of sheet metal products is mainly the surface processing of sheet metal products.The surface treatment of sheet metal products mainly includes electroplating, phosphating film, baking paint, oxidation and so on.The post-processing of sheet metal processing is mainly to protect materials, and coated with a layer of film on the surface to prevent oxidation, but also can enhance the adhesion of the paint, among them, phosphating film is mainly used for electrolytic plate class and cold rolled plate, after post-processing, sheet metal material is basically formed.Therefore, we must pay attention to the protection of materials, can not scratch bruise, otherwise it is not qualified products.Sheet metal processing process is the combination of theory and practice, is the mechanical manufacturing of the basic process knowledge, basic process methods and basic process practice organic combination of a production process.In the process of sheet metal processing, we should pay attention to the following aspects: in the use of sample drawings, to facilitate the expansion of materials and processing to save timeliness;Pressure riveting, tearing, punching convex point (package) and other position direction, to draw a section view, facilitate the convenience of processing, but also can more intuitive understanding;To check plate thickness, material and plate thickness tolerance and other parameters;Special Angle, such as the radius of the bending Angle (general R=0.5) to try to fold and expand;If there are easy to make mistakes, it should be highlighted to show the prompt;If there is a larger size, more complex place, this part of the drawing should be enlarged;Need to bake paint or protection, should also do a good job.Sheet metal processing is through stamping, bending, stretching and other means to process parts, therefore, in the processing process, must be completed in strict accordance with the sheet metal processing process.