1.Slippery Material Problems
Cause Analysis
1.Bending mould selection is generally selected (4-6) T V groove width. the phenomenon of slippery material may be happened when the size of the bending is less than half of the selected V groove width.
2. Selected V groove is too large
3. Wrong processing
Solutions
1.Centreline deviation method (eccentric processing). make up as much as you can If the inner size of the bending material is less than (4-6) T/2.
2.Padding processing.
3.Bending with small V-groove and pressurizing with large V-groove
4.Smaller V-groove is used.
5. Internal bending width is narrower than the standard mould width.
2. The internal bending width is narrower than the standard mold width.
Cause Analysis
Because the standard width of the lower mold of the bending machine for a minimum of 10MM, so the bending part of the opening less than 10MM. 90-degree bending, the length of the dimensions shall not be less than √2 (L + V / 2) + T. Such bending, the mold must be fixed in the mold base (that is, in addition to the upward direction of the degree of freedom is not restricted) to avoid the mold’s displacement and lead to the scrapping of the workpiece or cause a safety accident.
Solution
1.Increase the size (in agreement with the customer), i.e. increase the width of the internal fold.
2. Plain mold machining.
3.Sharpen the tool (this will increase the cost of machining).
3.The hole is too close to the bending line, bending will make the hole pulling material, turning material.
Cause Analysis
Assuming that the hole from the bending line distance for L, when L < (4 — 6) T / 2, the hole will pull material. The main reason is that during the bending process, the material is deformed by the force of stretching, which results in the phenomenon of pulling and flipping.
Solution
1.Increase the size and grind the folded edge after molding.
2.Enlarge the hole to the bending line (must have no effect on the appearance and function.
3.Wire cutting or crimping process.
4.Mold eccentric processing
5.Modify the hole size
4. Distance between the edge of the drawing shape and the bending line L is small, and the drawing shape is deformed after bending.
Cause Analysis
When L< (4– 6) T/2, due to the contact between the drawing and the lower die, the drawing deformation occurs during the bending process.
Solution
1.Wire cut or score
2.Modify the size of the draw shape processing
3.Use special mold processing.
4.Eccentric mold processing
5. Long hem edges are warped after flattening.
Cause Analysis
Due to the long hem edge, it does not stick tightly in the flattening, which leads to warping of the end after flattening. This situation has a lot to do with the position of flattening, so pay attention to the position of flattening.
Solution
1.Fold the warp angle before hem and then flattened.
2. Flatten in several steps.
3. Press the end firstly so that the hem edge bends downward.
4. Flattened the root of the sheet parts.
Note: The flattening effect depends on the operator’s skill, so please pay attention to the actual situation when flattening.
6. Large height drawbridge is easy to break
Cause Analysis
1.Due to the drawbridge height is too high, the material stretching seriously lead to breakage.
2. Sharp corner of the plain mould are not grinding or not insufficient polishing.
3.The toughness of the material is too poor or the bridge is too narrow.
Solution
1.Lengthen the process hole on the broken side.
2.Increase the width of the bridge.
3.Sharpen the radius of the plain mould and increase the arc transition.
7. When processing the plain mould, the processing size will run.
Cause Analysis
Due to the forward pressure extruded on the workpiece during the machining process, the workpiece is displaced forward, resulting in the increase of the small warpage size L at the front.
Solution
1.Grind off the shaded part in the drawing. Generally, make up for the difference.
2.Grind off the self-locating part of the plain mould and replace it with the post-locating part.
8. The total size of the blanking material is too small or too big, and it does not match with the round surface.
Cause Analysis
1.The engineering drawing is unfolded incorrectly.
2.the size of the material is wrong.
Solution
If the calculated tolerance is within the tolerance range, then the workpiece is acceptable.
If the size is large, the part can be machined with a small V-groove.
If the size is small, the part can be processed with large V-groove.
9.The swelling crack, untightening and deforming was appeared after the drawing hole and riveting.
Cause Analysis
1.The expansion crack is due to the radius for punch die used at drawing hole is too small or the burr of the flange is too big.
2. Failed to rivet tightly is due to the draw hole expanding is not in place.
3. Deformation is caused by misalignment of holes or incorrect riveting way.
Solution
1.Change to use the punch with big radius
2.Increase the pressure, salad hole increase deepening, change the punch with larger radius.
3.Change the way of riveting and correct hole misalignment of the cause.
10. The stud was skewed or deformation of workpiece after riveting.
Cause Analysis
1. The workpiece is not broken flat when processing the product.
2. Uneven force or excessive pressure on the lower surface of the workpiece.
Solution
1) Level the workpiece when pressing the stud.
2. Make a support frame.
3. Readjust the pressure.
4. Increase the range of force on the lower surface and decrease the range of force on the upper surface.
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