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Sheet Metal Processing Flow
According to the structure difference of sheet metal parts, the technological process may be different, but the total does not exceed the following points.
1. Cutting: There are various ways of cutting, mainly the following ways
Shears: Shears are used to cut simple pieces of strip material. They are mainly prepared for blanking forming of dies. The cost is low and the precision is less than 0.2, but they can only process strips or blocks without holes and corners.
(2) Punch: It is to use the punch to punch the sheet metal parts into various shapes in one or more steps. Its advantages are short time consuming, high efficiency, high accuracy, low cost, suitable for mass production, but die design is necessary.
(3) NC NC cutting, NC cutting, NC cutting first to write NC processing program, using programming software, will draw the development diagram into NC number broaching machine tool recognizable program, so that according to these programs, one by one, blanking flat parts of various structural shapes on the plate, but its structure is affected by the structure of the tool, low cost, accuracy is less than 0.15.
Laser cutting is to cut out the structural shape of the flat plate by laser cutting. Like NC cutting, it needs to write a laser program. It can cut the flat plate of various complex shapes with high cost and accuracy of 0.1.
Sawing Machine: Mainly used for aluminum profiles, square pipes, round pipes, round bars and other materials, low cost, low precision.
1. Fixters: sinking, tapping, reaming, drilling
The sinking angle is generally 120 C, used for riveting, 90 C for countersunk head screw, tapping English bottom hole.
2. Flanging: also known as punching, flanging, is to draw a slightly larger hole on a smaller base hole, then tapping, mainly using sheet metal processing with thinner thickness, increasing its strength and number of thread loops, avoiding slippery teeth, generally used for shallow flanging with thinner thickness and normal hole periphery, basically unchanged thickness, allowing 30-40% thinner thickness, can get flanging than normal flanging. When the height is 40-60%, the maximum flanging height can be obtained by extruding 50%. When the plate thickness is large, such as 2.0, 2.5 or more, the plate thickness can be tapped directly.
3. Punching machine: is the process of using die forming. Generally, punching machine processes punching, cutting angle, blanking, punching bump (bump), punching tearing, punching, forming and other processing methods. Its processing needs corresponding die to complete the operation, such as punching blanking die, punching bag die, tearing die, punching die, forming die, etc. The operation mainly pays attention to location and direction.
4. Riveting: For our company, riveting mainly includes riveting nuts, bolts, looseness, etc. It is through hydraulic riveting machine or punch to complete the operation, riveting it to sheet metal parts, and riveting way, we need to pay attention to direction.
5. Bending; Bending is the process of turning a 2D flat piece into a 3D part. Its processing needs a bending machine and corresponding bending die to complete, it also has a certain bending order, its principle is that the next knife does not interfere with the first bending, will interfere with the back bending.

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