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Common Problems and Solutions for Precision Molding

Views: 4     Author: Site Editor     Publish Time: 2022-08-16      Origin: Site

In the production and processing of precision mold parts, we may encounter a variety of problems, although, for the commission side of the customer, these encountered problems are factory problems, for these problems can also let you have a deeper understanding of precision mold processing, but also can better identify the quality of the mold, for you to select a suitable precision mold suppliers to have more help.

precision molding

Let's take a look at what are the common problems of precision mold processing and their solutions.


1. Precision mold offcuts jump

1) The punch length is not enough - according to the punch edge cut into the material thickness of 1mm punch die. (b) After replacing the punch, ensure that the die cannot accumulate too much scrap.

2) Excessive die cavity clearance - a tool to reduce clearance or lengthen the cam die to punch out the scrap in the die cavity completely.

3) Punch or template not demagnetized - demagnetize the punch or template with a demagnetizer. After finishing, use a thin iron sheet of 0.5mm to verify the demagnetization effect.


2. Precision mold scrap for blocking holes

1) The drop hole is too small - or the drop hole is misaligned, which is relatively simple. Increase the drop hole to make the drop processing smooth.

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

3) Taper is not placed on the cutting edge - line cutting taper or reverse reaming can be used to reduce the length of the straight wall position

4) The straight wall position of the cutting edge is too long - drill holes on the opposite side to make the straight wall position of the cutting edge shorter

5) Cutting edge collapse - resulting in a significant cutting edge and resharpening the cutting edge with blocking material


3. Poor metal mold coverage

1) Cutting edge collapse - resulting in too large a cutting edge requiring resharpening

2) Excessive convex die clearance - tangent lines into blocks and re-fit clearance

3) Poor die edge finish - polished edge straight wall position

4) Too small convex die clearance

5)The top force is too large - reverse pull out for tip spring to reduce the top force


4. Uneven edge of precision mold

1) positioning offset adjustment positioning

2) There is a single-sided molding, pulling material to increase the compression force, adjust the positioning

3) design errors, resulting in uneven tooling, re-scoring cutting edge blade

4)Feeder does not allow adjustment

5)If the feed step is miscalculated, recalculate the step and re-set the tool position


5. The punch of the Precision mold is easy to break

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

2) Improper positioning of the material leads to punching the convex die side, adjusting the positioning, or causing the feeding device to break due to uneven force

3) The cutting edge is blocked by the edge material of the lower die, causing the punch to break; re-drill the large drop hole to make the drop material smooth

4) Fixed part of the punch and guiding part (clamping plate) or re-cutting block to make the punch move up and down smoothly (punching plate)

5) Poor guidance of the punch plate causes the punch to deviate to one side, repairing the gap of the punch plate

6) Punch edge is too short, interfering with the plate when replacing the punch again, increasing the length of the edge

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

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

9) If the punch surface is strained and the stress is not uniform when the punch is released, replace the punch again

10) If the punch is too thin, too long, or not strong enough, replace the punch type again

11)The punch hardness is too high, the punch material is not changed, heat treatment hardness adjustment


6. Precision mold iron chips

1) due to pressure bar misalignment, recalculate the pressure bar position or bending position

2) bending gap is too small, squeeze iron chips to readjust the gap, or grind forming block or forming punch

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

4) the edge material is too small and should be reconnected to the edge

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


7. Precision mold sprouting bad

1) The center of the bottom hole and the center of the convex die do not coincide to determine the correct center position, move the position of the convex die, move to the convex die position, or adjust the position.

2) Uneven gap of the mold, resulting in sprouting gap too low or even fracture at the high side of the hair side trimming

3) If the germination bottom hole does not meet the requirements, the germination height and bottom hole aperture will be recalculated, and the pre-punched hole will increase or decrease the diameter deviation or even fracture.


8. Poor molding of Precision mold

1) The punch forming punch is too sharp, causing material cracking, and the R angle of forming punch is fixed at the cutter

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

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

4) Insufficient material at the forming part, the material should be expanded, the R angle should be trimmed, or the forming height should be reduced

5) Bad positioning, resulting in lousy forming, adjusting, positioning, or feeding device

6) molding gap is too small, resulting in cracks or deformation, adjust the gap


9. Precision mold bending size

1) mold adjustment is not in place, resulting in angular error, resulting in size deviation adjustment, poor mold height or angle difference

2) due to the lack of elasticity resulting in harmful angle size deviation, replacement spring

3) material does not meet the requirements, resulting in a wrong angle, resulting size changes, or readjusting the gap deviation

4) Deviation of material thickness causes a wrong angle, which leads to dimensional deviation. Determine the material thickness, replace the material or readjust the clearance difference

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

6) design or processing errors lead to a standard bending block between the patch welding and grinding, eliminating the gap between the block, resulting in a small bending size

7) forming without r-angle, bending corners and other standard conditions bending height is too small

8) both sides of the bending size are more significant than the pressure bar

9) unilateral bending draw size is not stable; increase the spring force, adjust the positioning

10) unreasonable gap, resulting in lousy angle and size deviation repair gap

11) the height of the bending knife is not enough; the bending punch is too short to fit into the bending knife. Increase the height of the bending knife so that the bending punch can try to fit into the bending knife force position as far as possible.


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