Bad reason: 1. Worn blade or punch. 2. The gap is too large (the effect is not obvious after grinding and trimming the knife edge). 3. The edge of the knife edge collapses. 4. The guide post/guide sleeve is worn.

Countermeasures: 1. Grind the blade. 2. Adjust the blanking gap according to the product part. 3. study the blade. 4. Adjust the cutting gap (to ensure the wear of the template hole or the forming accuracy). 5. Replace the guide rail or reassemble it.

(2) Crushed by jumping chips

Bad reason: 1. The gap is too big. 2. Improper feeding. 3. Oil drops are too fast and sticky when metal is stamped. 4. The mould is degaussed at last. 5. The punch is worn and debris adheres to the punch. 6. The punch is too short, and the length of the cutting edge entering the lower die is insufficient. 7. The material is hard and the stamping shape is simple.

Countermeasures: 1 control the machining accuracy of punch and lower die or modify the design gap; 2 Trim and clean the mold in time when the material belt is sent to the appropriate position; 3. Control the oil dripping amount of metal stamping, or change the oil to reduce the viscosity; 4 parts must be degaussed after training; 5. Study the stamping edge. 6. Adjust the length of the punching edge entering the lower die; 7. Modify the design, install and eject the end face of the punching tool or trim the inclined plane or arc (pay attention to the direction), reduce the joint area between the end face of the punching tool and the chip, and prevent chip jumping in vacuum; 8. Reduce the sharpness of the cutting edge of the lower die, reduce the grinding amount of the cutting edge of the lower die, increase the surface roughness of the cutting edge of the lower die, and use a vacuum cleaner to suck chips to reduce the stamping speed.

(3) sundry jam

Bad reason: 1. The leak is too small, 2. The leakage hole is too big, and the debris rolls, 3. Knife edge wear, big burr, 4. Oil droplets are washed too fast by hardware, and oil sticks together. 5. The surface of the straight edge of the lower die is rough, and powder crumbs are sintered and attached to the edge. 6. This material is very soft.

Countermeasures: 1. Modify the leak, 2. Modify the leak, 3. Research knife edge, 4. Control the amount of oil dripping and change the type of oil, 5. Pay attention to reducing surface roughness during surface treatment and polishing, 6. Modify the blanking gap by changing the material, 7. Trim the bevel or arc of the end face of the punch blade and use a vacuum cleaner.

(4) the change of blanking offset size

Bad reason: 1. The punch and the lower die blade are worn, resulting in burrs (too large in shape and too small in inner hole). 2. The design size and gap are not suitable, and the machining accuracy is poor. 3. The punch and the lower die insert in the blanking position are offset, and the gap is uneven. 4. The guide pin is worn and the warp setting is not enough. 5. The guide is worn. 6. Press the paper feeding distance of the paper feeding device. 8. The material level of the stripper insert is worn, and there is no material pressing function (material pulling and small punching). 9. The demoulding insert is pressed too deeply and the punching hole is too big. 10. The mechanical properties of metal stamping materials are variable (the strength elongation is unstable), 1 1. Punching force pulls the material in the stamping process, resulting in dimensional changes.

Countermeasures: 1. Research knife edge, 2. Modify the design and control the machining accuracy. Adjust its position accuracy, 4. Replace guide pin 5. Replace guide post and guide sleeve, 6. Readjust the feeder, 7. Re-adjust the clamping depth, 8. Re-polish or replace the stripper insert, increase the blanking function and adjust the blanking depth. 9. Control the feeding quality. 1 1. Trim an inclined plane or arc at the end of the punch to improve the stress condition during stamping. If allowed, the blanking piece has a guiding function on the stripper insert.

(5) die sticking

Bad reason: 1. Feeding distance, material pressing, looseness, improper adjustment, 2. The change of feeding distance in production, 3. Feeder failure, 4. Arc material, width out of tolerance, big burr, 5. Abnormal stamping of die hardware, sickle bending, 6. Insufficient warpage of guide hole, upper die drawing, 7. Bend or tear.

Countermeasures: 1. Readjustment, 2. Readjustment, 3. Adjustment and maintenance, 4. Change materials and control feeding quality, 5. Eliminate the sickle bend of the material belt, 6. Training of punching die for punching guide holes, 7. Adjustment of spring force of release, 8. Modify the guide plate to prevent material from being taken away, 9. Add up and down pressing materials between the feeder and the mold.

(6) Material belt sickle

Bad reason: 1. Hardware stamping burr, 2. Material burr mold is not trimmed, 3. The drilling depth is not suitable, 4. Chip in the stamping die, 5. Local pressing is too deep or parts are damaged.

Countermeasures: 1. Study the blanking edge, 2. Replace materials and add trimming devices to the mold. Adjust the depth of the punch. Clean the chip to solve the chip jump, 5. Check and adjust the height and dimension damage position of blanking parts and lower die inserts. Adjust with the whole bending mechanism.

(7) The broken edge of the punch collapses

Bad reason: 1. Chip jumping, chip blocking, die sticking, etc. 2. Improper feeding, half cutting, 3. Punching is not strong enough, 4. Small punching caused by pulling material during punching, 5. The punch and lower die are too sharp locally, 6. Punching clearance is too small, 7. No metal stamping oil or used metal stamping oil. 9. The precision of demoulding insert is poor or worn, and the precision guiding function is lost. 10. Incorrect die orientation and wear, 1 1. The material and hardness of punch and lower die are not suitable. 12. The guide rail (pin) is worn. 13. Washer.

Countermeasures: 1. Solve the problems of chip jumping, chip blocking and die sticking. Pay attention to feeding, trim the material belt in time, and clean the mold in time. Modify the design, increase the overall strength of the punch, shorten the size of the straight edge of the lower die, pay attention to the slope of the edge end face of the punch, and cut back a small part. Grind a small punch shorter than a large punch by one material thickness. Appropriately increase the stamping clearance of small parts; 7. Adjust the oil quantity of oil drops in metal stamping or change the oil type; 8. Check the melodious precision of each molding and adjust or replace it to control the machining precision; 9. study or change. 10. Replace the guide post and guide sleeve and pay attention to daily maintenance. 1 1. Replace the material with suitable hardness. 1.

(8) Size change of bending deformation

Bad reason: 1. The guide pin is inaccurate in size and worn; 2. The bending guide part has poor precision and wear; 3. The bending punch is worn (crushed) by the lower die; 4. There is not enough space for the dice; 5. The material slides, the bending punch has no guiding function, and the lower die is not preloaded when bending; 6. The mold structure and design size are poor.

Countermeasures: 1. Replace guide pin 2. Re-grinding or replacement, 3. Re-grinding or replacement, 4. Check and correct it, 5 Modify the design, add guiding function, add preloading function, 6. Modify design dimensions, decompose bending, add bending forming, etc. 7. Study the cutting edge of blanking position, 8. The adjustment adopts integral steel pad.

(9) Stamping height (multiple pieces per die)

Bad reason: 1. Burr of stamping parts. 2. The stamping parts are crushed, and there is waste in the mold. 3. The stamping parts and the lower die (bending position) are squeezed or damaged. 4. Flip the material during punching and shearing. 5. Wear and extrusion of related pressed parts. 6. Inconsistent tearing and cutting dimensions at the relevant tearing and cutting positions, as well as blade wear. 7. Related vulnerability.

Countermeasures: 1. Research frontiers, 2. Clean the mold and solve the problem of chip floating, 3. Re-study or replace new parts, 4. Study the punching edge, adjust or increase the strong pressure function, 5. 6, check the maintenance or replacement. Repair or replace the guaranteed cutting conditions. Give a speech, 7. Check the pre-cutting punch and keep or replace the lower die state.

(10) Improper maintenance

Bad reason: 1. When the mold has no foolproof function, the inserts that have deviated from the gap, such as reverse assembly and dislocation (referring to different stations), will not be restored as they are.

Countermeasures: 1. Modify the mold, add the function of foolproof, use the method of marking on the mold, and make necessary inspection and confirmation on the nursing belt after assembling the mold.