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Common knowledge and processing method of sheet metal

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  Let me explain some common sense and processing methods of sheet metal.
  Sheet metal material
  1. Electrolytic plate: SECC(N)(fingerprint plate), SECC(P), DX1, DX2, SECD(stretch plate). Material hardness: HRB50 ° + / - 5 ° longitudinal tensile plate: HRB 32 ° ~ 37 °.
  2. Cold rolled plate: SPCC, SPCD(stretching plate), 08F, 20, 25, q235-a, CRS. Material hardness: HRB 50 ° plus or minus 5 ° longitudinal tensile plate: HRB 32 ° ~ 37 °.
  3. Aluminum plate: AL, AL(1035), AL(6063), AL(5052), etc.
  4, stainless steel plates :SUS,SUS301(302,303,304),2Cr13,1Cr18Ni9Ti, etc.
  5. Other common materials are: pure copper plate (T1,T2), hot-rolled plate, spring-loaded plate, and so on.
  2. Sheet metal processing method

  Sheet metal processing method

  The blanking is to cut the material into desired shapes according to the expansion. There are many methods of blanking, which can be divided into shear and punching and laser cutting according to the type and working principle of machine tool.
  1.1 shearing -- use the shearing machine to cut the required shapes. The accuracy can reach above 0.2mm, mainly used for shearing bar or net material.
  1.2 blanking and blanking -- NC or general puncher for blanking. The precision of the two blanking methods can reach above 0.1mm, but the former has an edge mark when blanking and has low efficiency.
  1.2.1 when blanking the CNC punch press is used to punch and cut the plates through upper and lower die fixation and table movement. We have two kinds of CNC punch press: Taiwan press and AMADA press.
  1.2.2 general puncher is the shape of material needed to be removed by moving up and down moulds. The general puncher must cooperate with the shears in order to get out of the required shape.
  1.3 laser cutting -- use the laser cutting equipment to continuously cut the sheet to get the required material shape. It is characterized by high precision and can process materials with very complex shapes.
  2. Shape:
  Sheet metal forming is the most important method of sheet metal processing. Forming can be divided into manual forming and machine forming. Hand moulding is often rarely used as a complement to machining or finishing work. However, manual forming is still indispensable in the processing of some materials with complex shapes or prone to deformation. Manual shaping is accomplished by using some simple tools and fixtures. It mainly adopts the following methods: bending, flanging, closing, arch, winding and alignment, etc.
  What we mainly discuss here is machine forming: bending forming, stamping forming.
  2.1 bending forming -- the upper and lower dies are respectively fixed on the upper and lower tables of the folding bed. The relative motion of the table is driven by the transmission of servo motor, and the shape of the upper and lower dies is combined to realize the bending and forming of the plate. The bending precision can reach 0.1mm.
  2.2 stamping forming -- use the power driven upper dies generated by the motor driving flywheel, combine the relative shapes of upper and lower dies, make the sheet deform, and realize the processing and shaping of materials and parts. The precision of stamping can reach above 0.1mm. Press can be divided into ordinary punch and high - speed punch.
  Sheet metal connection is a way to connect different materials together and get the required products. Sheet metal joint can be divided into: welding, riveting, threaded joint and so on.
  3.1 welding can be divided into :CO2 welding, Ar welding, resistance welding, etc.
  It is mainly used for welding iron materials, and features: solid connection and good sealing performance; disadvantages: it is easy to generate deformation when 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, and 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 the current through the welding piece, heat the fusion welding piece, and connect the welding pieces.
  3.2 riveting can be divided into pressing riveting joint and riveting joint. Common riveting equipment includes riveting machine, riveting gun and POP riveting gun.
  3.2.1 riveted connection is to press the screws and nuts into the material pieces so that they can connect other parts with threads.Rivet connection is to connect two materials with rivets.
  Surface treatment
  The decorative and protective effects of surface treatment on product surfaces are recognized by many industries. Common surface treatment methods in sheet metal industry include electroplating, spraying and other surface treatment methods.
  1. Electroplating includes: galvanizing (colored zinc, white zinc, blue zinc, black zinc), nickel plating, chromium plating, etc. It mainly forms a layer of protective layer on the surface of materials and parts to protect and decorateRole;
  2. Spraying can be divided into two types: paint spraying and powder spraying. After materials are pretreated, paint is sprayed on the surface of the workpiece with spray gun and gas, and the coating is formed on the surface of the workpiece.
Other surface methods: anodizing, chromate, wiredrawing, sanding, etc.

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