Hardware mold common problems summary and solution analysis

1. Scrap metal mold jump hole

1) The length of the die punch is not enough - press the cutting edge of the punch to cut the die a material thickness plus 1mm, after replacing the punch, be sure to ensure that the die can not accumulate too much waste;

2) The gap of the die is too large - cutting the gap or lengthening the punch will completely flush the waste in the die.

3) The die punch or template is not demagnetized - the punch or template is demagnetized with a demagnetizer. After completion, use a thin iron sheet about 0.5mm thick to verify that the demagnetization effect has been achieved.



2. Metal mold waste plugging hole

1) The blanking hole is too small - or the blanking hole is offset, this situation is relatively simple, increase the blanking hole, so that the blanking can be handled smoothly.

2) The blanking hole has chamfer - increase the blanking hole and remove the chamfer, or drop the surface grinding and remove the chamfer

3) The taper of the knife edge is not placed - the taper of the line cutting can also be expanded on the opposite side to reduce the length of the straight wall position

4) The straight wall position of the knife edge is too long - the reverse drilling, so that the straight wall position of the knife edge is shortened

5) Edge collapse - resulting in a large tip, blocking material to re-grind the edge



3. The hardware mold is not good

1) Edge breakage - causing the edge to be too large to re-grind the edge

2) The gap between the punch and the die is too large - the line is cut into the block, and the gap is re-matched

3) Poor finish of the die edge - polishing edge straight wall position

4) The gap between the punch and the die is too small - re-save the die and match the gap

5) The topping force is too large - reverse pull out the cap to change the spring, reduce the topping force



4. The cutting edge of the metal mold is uneven

1) Positioning offset adjust positioning

2) There is unilateral forming, pull material to increase the pressing force, adjust the positioning

3) Design error, resulting in uneven reline cutting edge inserts

4) The feeder is not allowed to adjust

5) The feeding step calculation is wrong. Recalculate the step and reset the cutter position



5. Metal mold punch is easy to break

1) The closing height is too low, and the cutting edge of the punch is too long to adjust the closing height

2) Improper material positioning, resulting in unilateral cutting of punching punch, adjustment positioning or feeding device due to uneven force fracture

3) The lower die waste blocks the knife edge, causing the punch to break and drill a large blanking hole again to make the blanking smooth

4) The fixed part of the punch (splint) and the guide part are repaired or re-cut into the block to make the punch up and down smoothly (hitting the plate) offset

5) Poor plate guidance, resulting in the unilateral force of the punch to repair the plate gap

6) The punch edge is too short, and the plate interference to change the punch, increase the length of the knife edge part

7) The punch is not fixed well, moving up and down to re-fix the punch so that it cannot move up and down

8) The edge of the punch is not sharp and re-grind the edge

9) The punch surface is strained, and the force is uneven when the material is removed

10) The punch is too thin, too long, and the strength is not enough to change the punch type again

11) Punch hardness is too high, punch material is not replaced punch material, adjust the hardness of heat treatment



6. Metal mold iron filings

1) The position or bending position of the reinforcement is recalculated

2) The bending gap is too small, extrude iron filings to readjust the gap, or grind the forming block, or grind the forming punch

3) Bending punch is too sharp to repair R Angle

4) The knife edge material is too small to reconnect the knife edge

5) The squeezer is too narrow and re-grind the squeezer



7. Poor budding of hardware mold

1) The center of the bottom hole of the bud drawing and the center of the bud drawing punch do not coincide to determine the correct center position, or move the position of the bud drawing punch, or move to the bud drawing - edge high - edge low or even break the dynamic pre-punching position, or adjust the positioning

2) The gap of the die is not uniform, resulting in low or even broken sprout gap between the sprouting - edge high - edge repair

3) The bottom hole of the bud extraction does not meet the requirements, resulting in the height of the bud extraction and recalculation of the bottom hole aperture, pre-punching to increase or reduce the diameter deviation, or even rupture



8. Poor molding of hardware mold

1) The molding die punch is too sharp, causing the material to crack the molding punch repair R Angle, the knife edge is appropriate to repair R Angle

2) The length of the forming punch is not enough, resulting in failure to calculate the correct length of the punch to adjust the actual length of the punch to meet the forming requirements

3) The forming punch is too long, the forming material is compressed and deformed, and the correct length of the punch is determined, and the actual length of the punch is adjusted to meet the requirements until the punch breaks

4) The material at the molding is not enough to cause tension, or calculate the expansion of the material, or repair the R Angle, or reduce the molding height

5) Poor positioning, resulting in poor molding adjustment positioning or feeding device

6) The forming gap is too small to cause tension or deformation



9. Bending size of hardware mold

1) The mold is not adjusted in place resulting in Angle error resulting in poor size adjustment closing height or poor Angle difference

2) Insufficient elasticity causes poor Angle resulting in dimensional deviation to change the spring

3) Material does not meet the requirements resulting in poor Angle resulting in dimensional material change or readjust gap deviation

4) Material thickness deviation caused by poor Angle resulting in size deviation to determine the material thickness, change the material or readjust the gap difference

5) Improper positioning leads to size deviation Adjust positioning so that the size is OK

6) Design or processing errors cause a repair welding grinding between the bending blocks, eliminating the gap between the blocks, resulting in small bending size

7) The forming public has no R Angle, and the bending height under the forming public repair R Angle is small in the Angle and other normal conditions

8) Both sides bend the size of the large compression bar

9) Unilateral bending and pulling material cause dimensional instability increase spring force, adjust positioning

10) Unreasonable clearance, resulting in poor Angle and size deviation repair clearance

11) The height of the folding knife is not enough, and the folding punch is too short to increase the height of the folding knife, so that the bending punch is as close as possible to the folding knife position, resulting in more bad angles

12) The bending speed is too fast, resulting in bending root deformation adjust the speed ratio control, select a reasonable speed

13) The structure is not reasonable, the folding knife is not inserted into the fixed template, re-milling slot, the folding knife is inserted into the template stamping, resulting in a larger gap

14) The hardness of the molding heat treatment is not enough, resulting in the collapse of the pressure line or the remade type of the pressure line



10. Hardware mold is not unloaded

1) Improper positioning or improper feeding Adjust the positioning or feeding device

2) Avoidance is not enough to trim avoidance

3) The inner guide column is strained, resulting in poor plate movement. Replace the inner guide column

4) The punch is strained or the surface is not smooth to replace the punch

5) The layout of the top material pin is unreasonable and the location of the top material pin is re-arranged

6) The topping force is not enough, or the stripping force is not enough to replace the topping spring or stripping spring

7) The punch is not smoothly matched with the splint plate. Repair the punch plate and the splint plate to make the punch smooth

8) The forming slider is not smooth with the repair slider and the guide groove to make it smooth

9) The plate heat treatment is not comfortable, after stamping for a period of time, re-grind the plate to correct the deformation

10) The punch is too long or the length of the ejector pin is not enough to increase the length of the ejector pin or change the length of the appropriate punch

11) Replace the punch when the punch is broken

12) The template is not cloud magnetic, the workpiece goes up to the template demagnetization



11. Mold production material delivery is not smooth

1) The mold is not upright, resulting in the material belt and the feeder and the mold heavy frame mold or adjust the feeder is not in the same straight line

2) Uneven adjustment levelling machine or material replacement

3) Do not discharge caused by the feeding of non-discharge refer to the solution of non-discharge

4) Positioning is too tight adjust positioning

5) The guide pin is too tight or the straight wall position is too long to adjust the guide pin

6) The punch is not fixed well or too long and the material belt interferes with the punch with the right length to be fixed

7) The top pin is too short, and the material belt interferes with the forming block to adjust the length of the top pin to avoid interference

8) Improper placement of floating block position Adjust the floating block position



12. Mold riveting is not good

1) The closing height of the mold is improper and the riveting is not in place to adjust the closing height

2) The workpiece is not put in place, positioning deviation adjustment positioning

3) Before riveting the workpiece is bad to confirm the bud hole, refer to the solution of bad bud hole to confirm whether the rivet hole is chamfered, if there is no chamfering, increase the chamfering

4) riveting punch length is not enough to replace the length of the appropriate punch

5) The riveting punch does not meet the requirements to confirm and meet the requirements of the riveting punch



13. Mould missing or reverse loading

1) When assembling carefully, be careful enough to avoid loading the wrong punch

2) No direction of the punch mark the directional punch



14. Mold installed wrong screws

1) Do not know the thickness of the template understand the thickness of the template is too long or too short

2) Not careful enough, lack of experience to choose the appropriate screws



15. Disassemble mold

1) The pin hole is not wiped clean the pin hole, the pin is wiped clean, the mold should be removed first when the positioning pin is easy to damage when installing the mold, the screw should be guided first, and then the positioning pin hole

2) Do not hurt the pin hole when the installation and dismantling mold procedure is not correct



16. Mold positioning pin

1) Hole wall hair, scratch caused by too tight mold, carefully check whether the pin hole hair, otherwise the pin hole should not be played out rereaming

2) The pin hole is offset or there is no escape hole under the pin escape hole



17. Metal mold spring is too long

1) Do not pay attention to the depth of the spring hole measure the depth of the spring hole, calculate the compression amount of the spring, and re-select can not be pressed to

2) not careful enough, lack of experience suitable spring dead center