Home > News > Summary of common problems of hardware mould and analysis of Solutions

Summary of common problems of hardware mould and analysis of Solutions

Aug. 12, 2020

DONGGUAN SINYI PRECISION METAL CO.,LTD. develops and manufactures all kinds of stamping dies within 4 meters, including large-scale automobile dies and hardware dies for electronic products. The team of the company has rich experience in hardware mold design and manufacturing. Now we make a simple summary of the common problems of hardware mold encountered in the past, and share the solutions as follows:

1. The scraps of hardware mould jump

1) the length of die punch is not enough -- cut into the die with a material thickness of 1mm according to the cutting edge of the punch. After replacing the punch, make sure that the die cannot accumulate too much waste;

2) the die cavity clearance is too large -- the cutter reduces the clearance or lengthens the punch to completely punch the waste in the cavity.

3) die punch or template not demagnetized -- demagnetize punch or template with demagnetizer. After the completion, a thin iron sheet with a thickness of about 0.5mm was used to verify that the demagnetization effect has been achieved.

2. The waste of hardware mold is used to block the hole

1) the blanking hole is too small -- or the blanking hole is out of position, which is relatively simple. Increase the blanking hole so that the blanking can be handled smoothly.

2) the blanking hole has chamfering - increase the blanking hole, remove the chamfering, or reduce the surface grinding, remove the chamfering

3) taper not placed on the cutting edge -- line cutting taper, or the reverse expansion hole can be used to reduce the length of straight wall position

4) the straight wall position of the knife edge is too long -- drill holes on the opposite side, so that the straight wall position of the knife edge is shortened

5) cutting edge collapse - causes large cutting edge and regrinding cutting edge with plugging material

3. Poor covering of metal mold

1) cutting edge collapse - causes too large cutting edge to be reground

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

3) poor finish of die edge -- straight wall position of polishing edge

4) the gap between punch and die is too small

5) too much jacking force -- pull out the tip changing spring reversely to reduce the jacking force

4. The cutting edge of the hardware mold is uneven

1) positioning offset adjustment positioning

2) there is unilateral molding, material pulling increases the pressing force, and adjusts the positioning

3) design error, resulting in unevenness of the cutting tool, re line cutting edge insert

4) the feeder is not allowed to be adjusted

5) if the calculation of feeding step distance is wrong, recalculate the step distance and reset the tool position

5. The punch of hardware mold is easy to break

1) the closing height is too low, and the cutting edge of the punch is too long. Adjust the closing height

2) improper positioning of materials results in cutting one side of punching punch, adjustment of positioning or fracture of feeding device due to uneven stress

3) the cutting edge is blocked by the scraps of the lower die, resulting in the break of the punch and re drilling the large blanking hole to make the blanking smooth

4) fix the fixed part (clamp plate) of punch and guide part or cut the block again to make the punch move up and down smoothly (punching plate)

5) the poor guide of the punching plate causes the punch to be forced on one side to repair the clearance between the punching plates

6) the cutting edge of punch is too short, and it interferes with the plate to change the punch again, increasing the length of the cutting edge

7) if the punch is not fixed well, the punch shall be fixed again to prevent it from moving up and down

8) if the edge of punch is not sharp, regrind the edge

9) if the punch surface is strained and the stress is uneven during stripping, change the punch again

10) if the punch is too thin, too long and not strong enough, change the punch type again

11) the hardness of punch is too high, the material of punch is not changed, and the hardness of heat treatment is adjusted

6. Iron chips of hardware mold

1) recalculate the position of pressing bar or bending position due to the dislocation of pressing bar

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

3) the bending punch is too sharp to repair the R angle

4) there are too few materials for the cutting edge, and the cutting edge shall be reconnected

5) if the pressing bar is too narrow, regrind the pressing bar

7. Poor sprouting of hardware mold

1) the center of the bottom hole and the center of the punch do not coincide to determine the correct center position, or move the punch position, or move it to the position of the punch, or adjust the position

2) uneven die clearance, resulting in low or even broken sprouting clearance of sprouting edge high edge repair

3) if the bottom hole of sprouting does not meet the requirements, the height of sprouting and the hole diameter of bottom hole will be recalculated, and the pre punched hole will increase or reduce the diameter deviation, or even break.

8. Poor forming of hardware mold

1) the punch of the forming die is too sharp, which causes the material to crack, and the R angle of the forming punch is fixed properly at the knife edge

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

3) if the forming punch is too long and the material at the forming part is deformed, the correct length of the punch shall be determined, and the actual length of the punch shall be adjusted to meet the requirements until the punch breaks

4) if the material at the forming place is not enough, the material shall be expanded, or the R angle shall be trimmed, or the forming height shall be reduced

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

6) the forming gap is too small, resulting in crack or deformation, and the adjustment gap

9. Bending dimension of hardware mold

1) the mold is not adjusted in place, resulting in angle error, resulting in dimension deviation adjustment, poor closing height or angle difference

2) the spring is replaced due to the size deviation caused by the poor angle caused by the insufficient elasticity

3) the material does not meet the requirements, resulting in poor angle, resulting in dimension change or readjustment of gap deviation

4) the deviation of material thickness causes the bad angle, which leads to the size deviation. Determine the material thickness, change the material or readjust the gap difference

5) size deviation caused by improper positioning adjustment and positioning to make the size OK

6) the design or processing errors cause repair welding and grinding between the common bending blocks, eliminate the gap between the blocks, resulting in small bending size

7) there is no r angle in the molding, and the bending height is too small under the angle and other normal conditions

8) the bending size of both sides is larger than that of the compression bar

9) the size is unstable due to unilateral bending and drawing, increase the spring force, and adjust the positioning

10) the gap is unreasonable, resulting in poor angle and dimension deviation repair gap

11) the height of the folding knife is not enough, the bending punch is too short to fit into the folding knife, increasing the height of the folding knife, so that the bending punch can fit into the force position of the folding knife as much as possible

Contact Us
  • +86 769 8188 6732

  • +86 769 8188 6752

  • +86 134 2896 6971

  • sales@sinyi-precision.com

  • sinyi.precision

  • D1 Building, Guancheng Innovation Industrial Park, Jinghai West Road No.99, Chang'an Town, Dongguan City, Guangdong Province, China.