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Chengcheng machinery tells you some common sense and processing methods of sheet metal

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  Let me explain some common sense and processing methods of sheet metal for you.
  1、 Sheet metal material
  1. Electrolytic plate: SECC (n) (fingerprint resistant plate), SECC (P), dx1, DX2, SECD (tensile plate). Material hardness: hrb50 ° ± 5 ° ‚ tensile plate: HRB 32 ° ~ 37 °.
  2. Cold rolled sheet: SPCC, SPCD (tensile sheet), 08F, 20, 25, Q235-A, CRS. Material hardness: HRB 50 ° ± 5 ° ‚ tensile plate: HRB 32 ° ~ 37 °.
  3. Aluminum plate: Al, Al (1035), Al (6063), Al (5052), etc.
  4. Stainless steel plate: SUS, SUS301 (302303304), 2Cr13, 1Cr18Ni9Ti, etc.
  5. Other commonly used materials are: pure copper plate (T1, T2), hot rolled plate, spring steel plate, aluminum zinc plate, aluminum profile, etc.
  2、 Sheet metal processing method
  1. Blanking:
  Blanking is to cut the material into the required shape according to the expansion. There are many cutting methods, which can be divided into cutting, punching and laser cutting according to the type and working principle of machine tool.
  1.1 shearing - cut out the required shape with a shearing machine. The accuracy can reach more than 0.2mm, which is mainly used for cutting strip materials or net materials.
  1.2 blanking - blanking with CNC punch (NC) or ordinary punch. The accuracy 1111 of the two blanking methods can reach more than 0.1mm, but the former will have knife marks during blanking and the efficiency is relatively low, and the latter has high efficiency but high single cost, which is suitable for mass production.
  1.2.1 when blanking, the NC punch is fixed by the upper and lower dies and the worktable moves to cut the plate and process the required workpiece shape.
  1.2.2 ordinary punch presses use the blanking die to punch out the required material shape through the movement of the upper and lower dies. The ordinary punch generally needs to cooperate with the shear to punch out the required shape, that is, after cutting the strip with the shear, then punch out the required material shape with the punch.
  1.3 laser cutting - use laser cutting equipment to continuously cut the plate to obtain the required material shape. It is characterized by high precision and can process materials with very complex shapes, but the processing cost is relatively high.
  2. Forming:
  Sheet metal forming is a main processing method in sheet metal processing. Forming can be divided into manual forming and machine forming. Manual forming is often used as supplementary processing or finishing work, which is rarely used. However, when processing some materials with complex shape or prone to deformation, it is still inseparable from manual forming. Manual forming is completed by using some simple tooling fixtures. The following methods are mainly used: bending, edge setting, edge closing, arching, crimping and shape correction.
  Here we mainly discuss machine forming: bending forming and stamping forming.
  2.1 bending forming - fix the upper and lower dies on the upper and lower worktables of the folding machine respectively, use the servo motor to drive the relative movement of the worktable, and combine the shape of the upper and lower dies to realize the bending forming of the plate. The forming accuracy of bending can reach 0.1mm.
  2.2 stamping forming - the upper die is driven by the power generated by the motor driving the flywheel, combined with the relative shape of the upper and lower dies to deform the plate and realize the processing and forming of materials. The precision of stamping can reach more than 0.1mm. Punches can be divided into ordinary punches and high-speed punches.
  3. Join
  Sheet metal connection is to connect different materials together in some way to get the required products. Sheet metal connection can be divided into welding, riveting, threaded connection, etc.
  3.1 welding can be divided into CO2 welding, AR welding, resistance welding, etc.
  3.1.1 CO2 welding processing principle: use protective gas (CO2) to mechanically isolate air from molten metal to prevent oxidation and nitriding of molten metal. It is mainly used for welding iron materials. Features: firm connection and good sealing performance. Disadvantages: it is easy to deform during welding. CO2 welding equipment is mainly divided into robot CO2 welding machine and manual CO2 welding machine.
  3.1.2 Ar arc welding is mainly used for welding aluminum and stainless steel materials. Its processing principle, advantages and disadvantages are the same as CO2. The equipment is also divided into robot welding and manual welding.
  3.1.3 working principle of resistance welding: use the resistance heat generated by current through the weldment to melt the weldment and heat it to connect the weldment. The equipment mainly includes Songxing series, Qilong series, etc.
  3.2 riveting can be divided into pressure riveting connection and rivet connection. Common riveting equipment include press riveter, pull riveter and pop rivet gun.
  3.2.1 press riveting connection is to press screws and nuts into material parts so that they can connect other parts through threads.
  3.2.2 rivet connection is to use rivets to connect two materials together.
  3、 Surface treatment
  The decorative and protective effect of surface treatment on the product surface is recognized by many industries. In the sheet metal industry, the surface treatment methods commonly used include electroplating, spraying and other surface treatment methods.
  1. Electroplating is divided into: galvanizing (color zinc, white zinc, blue zinc, black zinc), nickel plating, chromium plating, etc., which mainly forms a protective layer on the surface of materials and parts for protection and decoration.
  2. Spraying is divided into spraying and powder spraying. After pretreatment, spray the coating onto the workpiece surface with spray gun and gas.   The coating forms a coating on the workpiece surface and plays a protective role after drying.
  Other surface treatment methods: anodizing, chromate, wire drawing, sand blasting, etc.

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