Written By Mark Batson Baril
A diecutting company recently approached us for an answer on this question.
We are die cutting 1/8" & 3/16" superwood (automotive hardboard) with 1 1/8" 4 pt. Serrated, edge hardened 14 tpi(tooth per inch) rule on a 3/4" die board. We have tried all kinds of stripping rubber using the 1/16" and 1/8" above the rule for Ejection. We are using a 350 ton Bruno press, cutting into a belt. We are Constantly having problems with our rule rolling over in random areas, sometimes from trim getting caught in the die and not stripping, sometimes for unknown reasons. We are losing valuable machine time and incurring excessive maintenance times on the tooling. Can you help me with some suggestions or point me in a direction that I may be able to contact someone who may be able to help? I am desperate to find the solution to this problem. If you would require any further information you can contact me at:
After talking with the diecutter about this and gathering a few more facts, I have a few suggestions to make. As always, inquire with as many people in the Industry as you can. At least, you will get a couple of answers/technicalities you may not have thought of before. At most, you will find someone who has dealt with this exact problem before.
- I would suggest getting in touch with A Technical Expert over at your current ejection material supplier. Someone that really knows their stuff. Present the same question to them.
- I would suggest the same of your Machinery producer. They must have other customers doing the same thing you are and they may be able to add some suggestions.
- Talk with your current rule supplier about the problem. What type of rule are you using? The general specs. are 4 point 1.125" 14 TPI Hard - but who is making it for you? I have seen many cases where a change in bevel, TPI, Hardness or even serrated tooth profile can make a huge difference to the cutting pressure needed.
Die changes could include the following:
I believe that a combination of all of the items above will help to get this press moving at full blast. I hope this works to at least start your improvement process. Good Luck!
As it turns out this is a real success story that worked it’s way through the IADD’s technical answer system in the past couple of years. The suggestion about the bridges seemed to intrigue the diemaker and press operator the most and that area was chosen as the logical starting point. All the bridges in the tight areas were removed completely. The improvement was immediate and dramatic as the rule was strengthened and the fatigue roll-overs where eliminated completely! The press was back up and running at full blast with no further tinkering as this long term problem came to an abrupt end.
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