情况三：下模底部不平原因：1、材料本身不平整2、顶板和材料接触面积小或

Case of a three: lower mold uneven base <br><br>reasons: <br>1, the material itself is not flat <br><br>2, a top plate and a contact material having a small area or topping is not enough <br><br>3, the die without ejector apparatus <br><br>Solution: <br><br>1, leveling material <br><br>2, adjusting toppings ejector means increases the force of <br><br>3, or a correction to increase the top feed device <br><br>4, add shaping step <br><br>where four: after bending the sheet width direction <br>is curved arcuate portion Q deflection occurs in the width direction. <br>Reason: the amount of shrinkage due to the drawing and the parts in the width direction and torsional deflections produce inconsistent <br>solutions: <br><br>1, increasing the bending stress <br><br>2, increase correction step <br><br>3, the pattern material to ensure the bending direction angled

Scenario 3: The bottom of the mold is uneven<br><br>Reason:<br>1, the material itself is not flat<br><br>2, the top plate and material contact area is small or the top material force is not enough<br><br>3, no top material device in the die<br><br>Solution:<br><br>1, school leveling materials<br><br>2, adjust the top material device to increase the top material force<br><br>3, increase the top material device or correction<br><br>4, plus plastic surgery<br><br>Scenario 4: Bending the width of the plate direction deformation<br>The bent part appears in the width of the asked bow deflection.<br>Cause: Twist and deflection due to inconsistent pull depth and shrinkage in the width direction of the assembly<br>Solution:<br><br>1, increase the bending pressure<br><br>2, increase the correction process<br><br>3, to ensure that the material pattern and bending direction has a certain angle

Case 3: uneven bottom of lower die<br>Reason:<br>1. Uneven material<br>2. Small contact area between roof and material or insufficient jacking force<br>3. There is no ejector in the die<br>terms of settlement:<br>1. Leveling materials<br>2. Adjust the jacking device to increase the jacking force<br>3. Add jacking device or correction<br>4. Addition and shaping process<br>Case 4: deformation in width direction of sheet metal after bending<br>The curved part has bow deflection in the width.<br>Cause: torsion and deflection are caused due to the difference of drawing and shrinkage in the width direction of the part<br>terms of settlement:<br>1. Increase bending pressure<br>2. Add correction process<br>3. Ensure that there is a certain angle between material grain direction and bending direction