Harazawa guides you through the common blanking methods and precautions of sheet metal

Sheet metal is a comprehensive cold working process for sheet metal (usually under 6mm), including cutting, punching, bending, welding, riveting, die forming and surface treatment. Its remarkable feature is the same thickness of the same parts.
Sheet metal blanking methods are mainly several punching, laser cutting, plate shearing machine, mold blanking, etc., numerical control is currently commonly used, laser cutting is used for proofing stage (can also process stainless steel sheet metal parts), high processing costs, mold blanking is used for mass processing.
To introduce the blanking of sheet metal in terms of number of strokes:

 Digital punching machine is also called turret CNC punching machine, which can be used for blanking, punching, drawing holes, rolling bars, blanking blinds, etc. Its processing accuracy can reach +/-0.1mm.
  
The thickness of the sheet that can be machined by CNC is:
Cold rolled plate, hot rolled plate ≤4.0mm; Aluminum plate ≤5.0mm; Stainless steel plate ≤2.0mm
1. There are smaller size requirements. The smaller punching size is related to the shape of the hole, the mechanical properties of the material and the thickness of the material.
2, the number of punching hole spacing and hole edge. When the small distance between the punching edge of the part and the contour is not parallel with the contour edge of the part, the small distance should not be less than the material thickness t; When parallel, it should be no less than 1.5t.
3. When stretching the hole, the small distance between the stretching hole and the edge is 3T, the small distance between the two stretching holes is 6T, and the small safe distance between the stretching hole and the bending edge (inside) is 3T+R(T is the thickness of sheet metal, R is the bending fillet).
4. When processing the bending parts and drawing parts, a certain distance should be maintained between the hole wall and the straight wall.

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