Pressed Sheet Metal Stamping

I am waiting to see the answers here. I have always been curious about how to calculate punch press specs.

What about impact tool steel? I ask because maybe you are using just some high-carb steel.

http://www.crucibleservice.com/eselector/general/generalpart1.html

For tools needing high resistance to chipping or breakage, for instance where frail geometries or thin projections or sharp notches are a problem, high impact toughness is required. In general, tool steels, even those with low impact toughness, are many times tougher than solid carbide. (The toughness of carbide materials is often measured in inch-pounds, where tool steels are measured in foot-pounds.) Within the families of tool steels, there is some variation in impact resistance. Shock-resisting steels, like S7 and A9, are both designed to offer optimum resistance to breakage. However, they differ in their heat treating process. S7 cannot generally be coated for improved surface wear properties, because of its low tempering temperature. A9 is typically tempered at over 900 F, and thus may be coated by any of the common commercial coating processes. The maximum hardness of both grades is approximately 58/59 HRC. In examining alternatives to carbide tools, where chipping is the normal failure mode, the toughness comparisons among steels are usually moot. In these cases, the normal recommendation is to use CPM 10V or 15V instead of carbide in most applications, or Rex T15, Rex 76 or Rex 121 when high hardness is needed. These grades provide the closest wear and hardness properties to carbide, while offering the toughness properties of tool steels.

Well you did not include what presses were being used and if there are differnt angles in the metal to be stamped or if your stamping flat plate.

Here is a web site that has almost anything you could ever want to know about stamping metal.

http://www.freepatentsonline.com/5247825.html

http://www.freepatentsonline.com/result.html?query_txt=stamping+SAE+1010+sheet+material&sort=relevance&srch=top&search=

We do alot of stamping at our plant and we always use a air hardening tool steel. They are much more durable than anything out there. They are ...A2 good....D2 better...and DC-53 even better.

thanks for ur suggestion,

but we have already tried . could not get 100% efficency, because of punch and die wear very fast even though we maintain hardness 63HRC. Also we used DC-53 and failed.so we require new innovation for this case.

Dear VSAMSG,

If you have already tried all types of tool materials & not getting good life, then you may have to shift your focus also on to other parameters such as Tool design, Tool material heat treatment, right type of Press, tool mounting & alignment etc, Good Luck. Rangasamy

thanks,

if u need i will send my part drg.if u need i will send to u the tool drg also. pls study.thanks.

Send me you specs and I will take a look at them, something seems amiss here. Send it to mtdmaker@aol.com