When we produce molds, there are often situations where the dimensions of bent parts are not ideal, such as internal angle deviation and external angle deviation. Internal angle deviation occurs less frequently, with external angle deviation being more common.
In general, internal angle deviation tends to occur during the trial molding of new molds. We need to check if the flange height of the bending die is too high. How can we solve this issue? Here are a few points to consider:
1. Reduce the flange height of the bending die.
2. Reduce the contact area between the punch head and the material.
3. Adjust the closing height of the mold until it is fully closed.
4. Slow punch press speeds may also cause internal angle deviation, although the probability of this is relatively low. If this occurs, consider increasing the punch press speed.
5. Increase the bending clearance.
Moving on to external angle deviation, it is a common occurrence in mold production. When working on normal molds, we often encounter this issue during mold repair.
The solutions are summarized as follows:
1. Reduce the punch press speed.
2. Increase the flange height of the bending die. If there is an R angle, reduce the R angle (ensuring it does not affect product dimensions). If there is wear on the sharp corner of the flange on the bending die, sharpen the worn rounded corner to ensure smooth entry of the flange into the material.
3. Increase the contact area between the punch head and the material by raising the height of the bending punch.
4. Reduce the bending clearance. For old molds, check if worn punch heads need replacing.
5. Ensure the mold is fully closed.
