Lately, we're seeing many companies trying to further justify a servo press investment through production cost reduction, namely increasing die life/reducing wear.
Below is a comparison between a conventional press and servo press.
On the left side; the parts are rails of stainless steel with a production run of 100,000 pieces. With the conventional press, the speed is only 20 spm but in the servo the average is 50 SPM with 40 times the die life and better tolerance because you can slow down the stroke speed. That's money saved in down time and labor for maintaining dies! The type of profile used for this example is a combination of pendulum mode with a link motion profile.
The right side are handles made of hi-tensile steel. This is just blanking so the speed is the same. But there is a difference in die life and tolerances, again because you can slow down the stroke speed at bottom dead center. The prfile that best represents this is the Link Motion profile, which comes standard on every SEYI servo press as part of the 7 preset profiles, plus free motion.
And, of course, the tolerances are better because when you’re in the working area, you can slow down the speed and that will increase the die life.
Lesson learned; you can run tighter tolerances on the servo because you can run with slower speeds at BDC, whereas with a conventional press you have to open the tolerances because there is more friction, more heat. You’ll end up breaking punches.
Let us know if you have any questions