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Some common sense and processing methods about Sheet metal


First, Sheet metal materials
1. Electrolytic plate: SECC (N) (anti-fingerprint plate), SECC (P), DX1, DX2, SECD (stretched plate). Material hardness: HRB50 ° ± 5 ° ‚ tensile plate: HRB 32 ° ~ 37 °.
2. Cold rolled sheets: SPCC, SPCD (stretched 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 (302, 303, 304), 2Cr13, 1Cr18Ni9Ti, and the like.
5. Other commonly used materials are: pure copper plate (T1, T2), hot rolled plate, spring steel plate, galvanized aluminum plate, aluminum profile and so on.
Second, Sheet metal processing methods
1. Forming:
 Sheet metal forming is the most important processing method in Sheet metal processing. Forming can be divided into manual forming and machine forming. Hand forming is often used as a supplementary processing or finishing work. However, when processing some materials with complicated shapes or deformations, it is still inseparable from manual forming. Manual forming is done using a few simple fixtures. The following methods are mainly used: bending, edging, edge-closing, arching, curling, and sizing.
Our main discussion here is machine forming: bending forming, stamping forming.
2.1 Bending forming - The upper and lower dies are respectively fixed to the upper and lower tables of the folding bed. The relative movement of the driving table is transmitted by the servo motor, and the shape of the upper and lower dies is combined to realize the bending forming of the plate. The forming accuracy of the bend can reach 0.1 mm.
2.2 Stamping forming - The power generated by the motor-driven flywheel drives the upper die and combines the relative shape of the upper and lower die to deform the plate to realize the forming of the material. The precision of press forming can reach 0.1mm or more. Punch presses can be divided into ordinary punch presses and high speed presses.
2, cutting:
 The blanking is to cut the material into the desired shape according to the unfolding. There are many methods for cutting materials. According to the type and working principle of the machine, it can be divided into shearing and cutting laser cutting.
1.1 Cutting - Cut and cut the desired shape with a shearer. Accuracy can reach more than 0.2mm, mainly used for cutting strips or trimming materials.
1.2 Punching and cutting - Cutting with CNC punching machine (NC) or ordinary punching machine. The accuracy of the two cutting methods can reach 0.1mm or more, but the former will have a knife mark when the material is being cut and the efficiency is relatively low. The latter is high in efficiency but high in single cost and suitable for mass production.
1.2.1 When the CNC punching machine is unloaded, it is moved by the upper and lower molds to move the table to punch the sheet and machine the required workpiece shape. Our CNC punching machines mainly include Taiwan Lifu and AMADA.
1.2.2 The ordinary punching machine is used to move out the upper and lower molds and use the blanking die to punch out the required shape of the material. Ordinary punching machines generally must be matched with the shearing machine to punch out the desired shape, that is, after cutting the strips with the shearing machine, the punching machine is punched out to shape the desired material.
1.3 Laser cutting - continuous cutting of the sheet by laser cutting equipment to obtain the desired shape of the material. It is characterized by high precision and the ability to machine parts with very complex shapes, but with relatively high processing costs.
3, the connection
 Sheet metal joining is the joining of different pieces of material in some way to get the desired product. Sheet metal joints can be divided into: welding, riveting, threaded joints, etc.
3.1 Welding can be divided into: CO2 welding, Ar welding, resistance welding and so on.
3.1.1 Principle of CO2 welding processing: The protective gas (CO2) is used to mechanically isolate the air from the molten metal to prevent oxidation and nitridation of the molten metal. It is mainly used for welding iron. Features: strong connection and good sealing performance. Disadvantages: It is easy to deform when welding. CO2 welding equipment is mainly divided into robot CO2 welder and manual CO2 welder.
3.1.2 Ar arc welding is mainly used for welding aluminum and stainless steel materials. Its processing principle and 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: The electric resistance generated by the current through the weldment is used to heat the molten parts to connect the weldments. The equipment mainly includes Songxing series and Qilong series.
3.2 Riveting can be divided into: rivet joint and rivet joint. Common riveting equipments include riveting rivet rivet guns and POP rivet guns.
3.2.1 The rivet joint is to press the screw and nut into the material to make it possible to connect other parts by thread.
3.2.2 Rivet connection is the use of rivets to pull the two pieces together.
Third, the surface treatment
The decorative and protective effects of surface treatment on the surface of the product are recognized by many industries. In the Sheet metal industry, the surface treatment methods commonly used are electroplating, spraying and other forms of surface treatment.
1. Electroplating is divided into: galvanizing (color zinc, white zinc, blue zinc, black zinc), nickel plating, chrome plating, etc.; mainly forming a protective layer on the surface of the material to protect and decorate.
Function
2, spraying spray paint and powder spray two, after the material is pre-treated, spray the paint onto the surface of the workpiece with a spray gun, the paint forms a coating on the surface of the workpiece. After drying, it plays a protective role;

Other ways of surface: anodizing, chromate, wire drawing, sand blasting, etc.;


DESHENGRUI Machinery is a professional CNC manufacturing and Sheet metal fabrication company, including CNC machining services, CNC Turning service, CNC milling services, CNC drilling services, laser cutting services, stamping services, Die casting service, iron casting service and Steel Forging service.

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