One, the definition of sheet metal processing
Sheet metal processing is a metal processing process, usually the essence of some metal sheet by hand or die stamping to produce plastic deformation, the formation of the desired shape and size, and can be further through welding or a small amount of mechanical processing to form more complex parts. Sheet metal processing is called sheet metal processing, the main process is shear, bending buckle edge, bending forming welding, riveting, etc., need certain geometric knowledge. Sheet metal is sheet metal hardware, which can be processed by stamping, bending, stretching and other means of parts, such as the outer metal shell of the car is sheet metal. Metal processing processes corresponding to the sheet metal process are casting, forging, machining, etc., the metal thickness of the product is usually not consistent.
Two, sheet metal process classification
(1) Manual sheet metal
Using only relatively simple tools, most of the work is done by hand in sheet metal work, mainly in the fields of car repair, art, advertising and so on
② Stamping sheet metal
With the help of conventional or special stamping equipment power, so that the sheet metal in the mold directly by the deformation force and deformation, so as to obtain a specific shape, specifications of the sheet metal products production technology, only suitable for a single variety, large output, small structure, relatively stable product types
③ CNC sheet metal
Using numerical control technology and equipment to carry out comprehensive cold deformation processing of metal sheet, mainly including punching, cutting, folding, welding, riveting, surface treatment and other processes, suitable for small batch, variety, size of products
Three, the characteristics of sheet metal stamping process
Pressure products have good quality, such as smooth surface, high precision, relatively stable, good interchangeability; Light weight, good rigidity, high strength; Stamping process can also process other processing methods difficult to process the workpiece, such as thin shell parts, with flanging, undulation, reinforcement of the workpiece and so on. The dimensional precision of cold stamping parts is guaranteed by the die, so the dimension is stable and the interchangeability is good
② Stamping products do not need or only need a small amount of cutting, high material utilization rate, low material cost of the workpiece.
③ High production efficiency, simple operation, easy to realize mechanization and automation. Equipped with advanced production lines, it can realize automatic and mechanized operation of feeding, stamping, picking up parts and waste removal, with low labor intensity.
(4) the mould used for pressing processing is generally complex in structure, long production cycle and high cost. Therefore, stamping process is used for batch, mass production, single, small batch production is limited.
Four, sheet metal material type
① Ordinary cold rolled sheet SPCC
SPCC refers to the continuous rolling of steel ingot into steel coil or sheet of required thickness by cold rolling mill. SPCC surface without any protection, exposure to the air is easy to be oxidized, especially in the humid environment, the speed of oxidation, dark red rust, in use to spray paint, electroplating or other protection surface.
② Galvanized steel SECC
The base material of SECC is general cold-rolled steel coil, which becomes electrogalvanizing product after continuous electrogalvanizing production line goes through degreasing, pickling, electroplating and various post-treatment processes. SECC not only has the mechanical properties and similar machinability of ordinary cold rolled steel sheet, but also has superior corrosion resistance and decorative appearance. In the electronic products, home appliances and furniture market has a great competitiveness and substitution. For example, SECC is commonly used in computer cases.
③ Hot dip galvanized steel SGCC
Hot dip galvanized steel coil refers to the hot pickled or cold rolled semi-finished products, after cleaning, annealing, immersed in the temperature of about 460°C molten zinc tank, and the steel plate plated with zinc layer, and then after quenching and leveling and chemical treatment. SGCC material is harder than SECC material, has poor ductility (avoiding deep pumping design), thicker zinc layer, and poor weldability.
④ Stainless steel SUS301
Cr (chromium) content is lower than SUS304, poor corrosion resistance, but after cold processing can obtain a good tension and hardness, good elasticity, used for spring and anti EM.
⑤ Stainless steel SUS304
One of the most widely used stainless steel, because of Ni (nickel) than Cr (chromium) steel is rich in corrosion resistance, heat resistance. Has very good mechanical properties, no heat treatment hardening phenomenon, no elasticity.
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