The minimum size of a sheet metal hole is usually not less than 0.3mm, and the minimum distance between the hole and the edge should be ≥1.5 times the material thickness.
The minimum size of a punching hole varies for different materials.For example, the diameter of the round hole of high carbon steel should be ≥1.3 times the material thickness, and the short side width of the rectangular hole should be ≥1.0 times the material thickness; the diameter of the round hole of low carbon steel and brass should be ≥1.0 times the material thickness, and the short side width of the rectangular hole should be ≥0.7 times the material thickness; the diameter of the round hole of aluminum should be ≥0.8 times the material thickness, and the short side width of the rectangular hole should be ≥0.5 times the material thickness.
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Design principles and precautions for punching of sheet metal
Product thickness uniformity:
The thickness of sheet metal should be ensured to be uniform when designing, especially in places with more bends, to avoid uneven thickness problems.
Easy to flatten:
Sheet metal products are made of sheets. When designing, it should be ensured that all bends and bevels can be unfolded on the same plane without interference with each other.
Appropriately select the thickness of sheet metal parts:
The thickness of sheet metal parts should be selected according to the actual function of the product. Under the premise of meeting the strength and function, the thinner the better, but the thickness should not exceed 1.00mm.
Comply with the processing technology:
The processing technology of sheet metal parts should be considered during design, such as punching, bending, stretching, to ensure that the design is easy to manufacture.
Avoid sharp corners:
Sharp corners should be avoided during design to avoid affecting the life of the mold, and the corner joints should be rounded.
By following these design principles and precautions, it can be ensured that the size of the punching of sheet metal parts is reasonable and meets the processing requirements.
Of course, the specific value of the minimum hole margin is determined according to the thickness of the sheet. The thicker the sheet, the larger the minimum hole margin required. This is because thicker sheets require more space to accommodate the stress generated during punching or bending during processing. The R value is a constant related to the thickness of the sheet, which is used to adjust the calculation result of the minimum hole margin to ensure its effectiveness in practical applications.
Finally, it is worth noting that in the actual processing process, other factors such as punching shape, material mechanical properties, and specific processing methods need to be considered. For example, for parts that need to be bent, the location of the hole should be avoided as much as possible within the bending deformation zone to prevent the hole from deforming or cracking during the bending process. In addition, for different types of sheet metal materials, such as high carbon steel, low carbon steel, brass and aluminum, the minimum punching size will also be different, which will also affect the determination of the minimum hole margin.
It is recommended here to tell your needs to the sheet metal fabricators. The manufacturer will give professional and appropriate hole spacing recommendations based on the specific usage scenarios of the product. Of course, you should choose to trust the sheet metal fabricators because they have multiple sheet metal processing experiences and have manufactured sheet metal parts for various industries, so they are trustworthy. If you need to punch sheet metal parts in large quantities, you can choose to cooperate with Mulan Group, which is a professional Chinese sheet metal fabricators.
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