Common problems and disadvantages of stamping dies

Common problems and disadvantages of stamping dies and countermeasures. Problem point: punching edge

Bad causes: 1. Knife or punch wear

2. The clearance is too large (the effect is not obvious after grinding the blade)

3. Knife edge collapse

4. Guide column / guide sleeve wear

Solution: 1. Grinding knife edge

2. Adjust the blanking gap according to the product section

3. Researching the knife edge

4. Adjust the gap of the station (to ensure the wear of the template hole or the accuracy of the forming process)

5. Replace the guide or reassemble

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two.

Problem point: chipping crush

Bad reasons: 1. The gap is too large.

2. Improper feeding.

3. The stamping oil drops too fast, the oil sticks

4. Mold demagnetization

5. The punch is worn and the scrap is pressed onto the punch.

6. The punch is too short and the blade is not long enough.

7. Hard material, simple punching shape

Solution: 1. Control punch and lower die machining accuracy or modify design clearance

2. Trim the strip when it is delivered to the proper position and clean the mold in time

3. Control the amount of oil in the stamping oil, or change the oil to reduce the viscosity

4. Parts must be demagnetized after training

5. Study the punching edge

6. Adjust the length of the punch blade into the lower die

7. Modify the design, the end face of the punch blade is topped out or the beveled or curved shape is cut out (note the direction) to reduce the fit area of the end face of the punch blade and the chip, which can prevent vacuum chipping.

8. Reduce the sharpness of the lower die edge, reduce the grinding amount of the lower die edge, increase the surface roughness of the lower die edge, and use the vacuum cleaner to suck the scraps. Reduce the rush speed.

Problem point: chip blocking

Bad reasons: 1. The leakage hole is too small

2. The leakage hole is too large, and the material is tumbling

3. The knife edge is worn and the burr is larger

4. Stamping oil drops too fast, oil stick

5. The surface of the lower straight blade is rough, and the powder is sintered and attached to the blade.

6. The material is soft

Solution: 1. Modify the leak hole

2. Modify the leak hole

3. Researching the knife edge

4. Control the amount of oil dripping and change the oil type

5. Pay attention to reduce surface roughness during surface treatment polishing

6. Change material modification punching clearance

7. The end face of the punch blade is trimmed or curved, using a vacuum cleaner

four

Problem point: variation in the size of the blank

Bad causes: 1. The punch and the lower die are worn, resulting in burrs (larger shape, smaller inner hole)

2. Inappropriate design size and clearance, poor machining accuracy

3. Deviation of the lower punch and lower die insert, uneven gap

4. Guide pin wear, not enough

5. Guide wear

6. Feeder feed distance, press material, loose adjustment and improper adjustment

7. Improper mold clamping depth

8. The material of the stripping block is worn, and the material is not pressed.

9. The stripping block is too strong and the punching is too large.

10. Mechanical properties of stamping materials vary (intensity elongation and other instability

11. When the punching force is used to pull the material, causing dimensional variation

Solution: 1. Research knife edge

2. Modify the design to control the machining accuracy

3. Adjust its positional accuracy

4. Replace the guide pin

5. Replace the guide post, guide sleeve

6. Readjust the feeder

7. Readjust the clamping depth

8. Re-grind or replace the stripping insert, increase the pressure function and adjust the binder

9. Reduce the depth of strong pressure

10. Replace materials to control feed quality

11. The end of the punch is trimmed with a bevel or curved shape to improve the stress condition during the punching. When permitted, the blanking portion is placed on the stripping insert to provide a guiding function.

V. Problem point: card model

Bad reasons: 1. Feeding distance, pressing, relaxing, improper adjustment

2. Variation in the distance of production

3. Feeder failure

4. The material is curved, the width is out of tolerance, and the raw edges are larger.

5. The mold is abnormally stamped, and the sickle bend is triggered.

6. The guide hole is insufficient, the upper die is pulled

7. Bending or tearing the bit is not smooth

8. The material removal function of the guide plate is improperly set.

9. Belt belt

10. The material is thin and sent to the warp.

Solution: 1. Re-adjust

2. Re-adjust

3. Adjustment and maintenance

4. Replace materials to control feed quality

5. Eliminate the belt twisting

6. Training and punching the punch punch

7. Adjust the strength of the take-off spring, etc.

8. Modify the guide plate, the belt on the anti-feed belt

9. Add the upper and lower pressing materials between the feeder and the mold, and add the upper and lower extrusion safety switch.

10. Re-laying the mold

Six. Problem points: Tape sickle

Bad reasons: 1. Stamping flash

2. Material raw edge mold without trimming

3. Improper punching depth

4. The internal damage of the stamping die

5. The local pressure is too deep or pressed to the local damage

Solution: 1. Training the cutting edge

2. Replace the material and add a trimming device to the mold

3. Re-adjust the depth of the punch

4. Clean the mold and solve the chipping

5. Check and adjust the damage of each of the material removal and the lower die height dimension

6. Adjust the bending mechanism

7. Punch breaks
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