Speaking of sheet metal process holes, its role is to prevent material from being pulled during the sheet metal bending process. When the sheet metal bend line intersects at one point, or the sheet metal bend line is close to the edge of the sheet metal and is less than 2 times the thickness of the sheet metal, it is necessary to increase the sheet metal bending process hole to avoid bending and drawing. Bending process holes are generally used for sheet metal parts that are bent by hemming. They are not for hemming and can be omitted.
Disadvantages of not opening process holes: corners will have less material thickness, welding requires filler, and it is easy to cause welding deformation. Advantages of crafting holes: In the case of hemming, the bending process hole can allow the hemming to be smoothly bent into place without bending the material.
Bending process holes are usually better with round holes. Square holes generally look at how wide your number of punching tools are, the round holes have less material removal, and they are more beautiful after molding. Bending process holes (long side and short side) generally put the center of the circle at the intersection of the bending line, of course, it is harmless to offset by 0.1-0.2.
How to determine the size of the process hole? In fact, there are various situations, such as round holes / OB holes / RE holes, side edges, bent edges, or hole distances. In the case of cold plates, it is generally no problem to open holes with a diameter of 1.5 times the thickness of the plate, and generally more than 2 times the thickness of the plate. For thin plates below 1.0, the process holes can not be opened.
In addition, when the sheet metal hole is bent, the hole near the bend line is prone to be stretched and deformed. Generally speaking, the distance between the edge of the hole and the bend should be at least 3 times the thickness of the material so that the hole will not occur. Deformation.
In short, if the process hole is at the intersection of two lines, the process hole is twice the thickness of the board. The minimum thickness must not be less than 1.5 times the sheet metal thickness. When bending sheet metal thick plates, considering the rounded corners, the process holes must be appropriately enlarged.
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