The bending machine's ability to bend a certain length is not related to the model, but mainly depends on the V-groove and bending tools. Typically, the V-groove width is 6 times the thickness of the sheet metal, meaning that the bending line should be at least 3t above the top of the sheet. If the V-groove is too small, the bending coefficient will change, and excessive pressure on the V-groove can affect its lifespan.
To determine whether sheet metal can be bent, not only should the bending length not be too short, but also the following points should be considered:
1. Whether the length exceeds the longest bending limit of the back gauge vertically;
2. Whether it exceeds the maximum length of the current bending bed horizontally;
3. Whether the second knife of the U-shaped fold will hit the tool or machine above;
4. Whether the sides of the box-shaped workpiece are bent properly, and if bending the other two sides will result in hitting the top;
5. Whether protruding parts near the bending line will be compressed during bending.
In addition to experience, putting the bending mold into the computer and simulating it when unsure is a good method. Most of the bent workpieces on CNC bending machines are at 90 degrees. When the 90-degree workpiece is formed, check what it looks like on the mold. If it's a straight mold, it forms at 45 degrees; if it's a curved mold, it's parallel.
When looking at drawings, the opening size of the lower die must be specified, and if special upper and lower dies are to be used, the die code must be indicated.
The bending coefficient refers to the extension value of the sheet metal during bending, mainly determined by the plate thickness, bending angle, and lower die opening size.
For cold-rolled steel plates below 4mm in thickness, with the same lower die opening size and bending angle chosen, the bending coefficient can be considered a fixed value. For hot-rolled steel plates ≥4mm, the bending coefficient should be determined as needed.
Common bending data typically have the lower die opening size as 6 times the plate thickness. For convenience, when bending 1-2.5mm steel plates, a lower die opening size of 12mm is generally used.
If the actual lower die opening size cannot be selected from the table, the bending coefficient value should be looked up separately. The bending coefficient values for the same thickness of cold-rolled and hot-rolled steel plates may differ by around 0.1-0.2 and should be noted. It is reiterated that the bending coefficients for 5-6mm steel plates are empirical values based on commonly purchased steel plates and should be verified before use.
To determine whether sheet metal can be bent, not only should the bending length not be too short, but also the following points should be considered:
1. Whether the length exceeds the longest bending limit of the back gauge vertically;
2. Whether it exceeds the maximum length of the current bending bed horizontally;
3. Whether the second knife of the U-shaped fold will hit the tool or machine above;
4. Whether the sides of the box-shaped workpiece are bent properly, and if bending the other two sides will result in hitting the top;
5. Whether protruding parts near the bending line will be compressed during bending.
In addition to experience, putting the bending mold into the computer and simulating it when unsure is a good method. Most of the bent workpieces on CNC bending machines are at 90 degrees. When the 90-degree workpiece is formed, check what it looks like on the mold. If it's a straight mold, it forms at 45 degrees; if it's a curved mold, it's parallel.
When looking at drawings, the opening size of the lower die must be specified, and if special upper and lower dies are to be used, the die code must be indicated.
The bending coefficient refers to the extension value of the sheet metal during bending, mainly determined by the plate thickness, bending angle, and lower die opening size.
For cold-rolled steel plates below 4mm in thickness, with the same lower die opening size and bending angle chosen, the bending coefficient can be considered a fixed value. For hot-rolled steel plates ≥4mm, the bending coefficient should be determined as needed.
Common bending data typically have the lower die opening size as 6 times the plate thickness. For convenience, when bending 1-2.5mm steel plates, a lower die opening size of 12mm is generally used.
If the actual lower die opening size cannot be selected from the table, the bending coefficient value should be looked up separately. The bending coefficient values for the same thickness of cold-rolled and hot-rolled steel plates may differ by around 0.1-0.2 and should be noted. It is reiterated that the bending coefficients for 5-6mm steel plates are empirical values based on commonly purchased steel plates and should be verified before use.
