Double thickness sheet metal cutting
A friend from Australia wrote to me asking for assistance on one of his project. He had a tool, which used a pressure pad to flatten a Ø1″ tube followed by punching a ¼” square hole on it.
The tool used the punched slug from the top thickness as the punch for the bottom thickness; the cutting clearance is about 10% or more of the flattened thickness. The picture bellow shows the part after it had been punched.
From the picture, we can see large roll over at all of the edges on the topside of the square cut hole; it seems that excessive cutting clearance was applied to this job. High burr appeared at the lower part of the cut edges and the roll over at the top of the lower thickness showed that the cutting was not done effectively.
I recommended him to put a reverse “V” shape shear angle on the punch to ensure cutting is done by the hardened punch at all time instead of the punched slug. A 5% cutting clearance per side should be applied for this job.
We tried your method on one of our product, it works very well. We can now control the burr and achieved better cutting result.
Only thing we concern is that, the punch wear off very fast. Any suggestion?
how about check corner radious of Punch & dies in spqare hole
i guess there are no good clearance between punch and dies.
punch has a edge in corner, but dies has a Radious.
every stamping shot, punch will worn out…
please make sure corner clearance…
No exactly right. You can always put a radius at the punch corner.
Warm Greetings!
Today, I visited your website and found it to be very informative. I’m highly pleased to see the comprehensive resources being offered by your site.
Kudos to you for the great work!
Thanks and Regards
this blog very interesting
Thanks and Regards
Warm Greetings!
Today, I visited your website and found it to be very informative. I’m highly pleased to see the comprehensive resources being offered by your site.
Kudos to you for the great work!
metal cutting