TRIANGULAR PERFORATION........
TRIANGULAR PERFORATION........
(OP)
Heloo friends,
I want to perforate a 4 feet wide C.R steel sheet with triangular holes, for which i need to make a die.
NOw my question is how to make a die for triangular perforation?.
I have a flat die steel( not hardened) block of thickness 12mm.i have to cut triangular hole through it of dimesion as follows- equilateral triangle of vertices 3.5mm. Thw block is 4.5 feet long and i have to make a double row die and in one row there have to be atleast 80 tri. holes, this block is to be used as a die.
Kindly suggest how to make such an hole in sucha thick metal block what tools to be used?
I want to perforate a 4 feet wide C.R steel sheet with triangular holes, for which i need to make a die.
NOw my question is how to make a die for triangular perforation?.
I have a flat die steel( not hardened) block of thickness 12mm.i have to cut triangular hole through it of dimesion as follows- equilateral triangle of vertices 3.5mm. Thw block is 4.5 feet long and i have to make a double row die and in one row there have to be atleast 80 tri. holes, this block is to be used as a die.
Kindly suggest how to make such an hole in sucha thick metal block what tools to be used?





RE: TRIANGULAR PERFORATION........
Don
Kansas City
RE: TRIANGULAR PERFORATION........
Note: Ask them to cut the straight land, _and_ the back taper for slug clearance.
Mike Halloran
Pembroke Pines, FL, USA
RE: TRIANGULAR PERFORATION........
I would speak to a press toolmaker as perf tools soon build up tonnage so consider doing the holes in a progression set up and staggering the punches also a 4.5 foot die only 12mm thick is not a good practice with the forces involved and will be very prone to cracking. Any radii you can put on the tips of the triangles will help.
RE: TRIANGULAR PERFORATION........
your advice and suggestions helped a lot.
RE: TRIANGULAR PERFORATION........
If you are going to be producing large quantities of perforated sheet you need to consider how you will sharpen the die plate. Also consider how you are going to repair the die block when something or someone screws it up. I would consider inserts instead of edm'ing numerous triangular holes. Visit the website of a die component manufacturer to see what type of matrixes and punches you can purchase that have your hole geometry. Dayton Progress is one:
http://www.daytonprogress.com/
If you have a small quantity requirement look into getting your sheets laser cut. I have had sheets laser cut instead of having a die built. The latest quote I got for getting a new perforating die built was in the $40,000 range. You can get lots of sheet laser cut for that amount.
I suggest you download "The Designers, Specifiers and Buyers Handbook of Perforated Metals" from the following website:
http://www.iperf.org/pdfdownloads.html
I also suggest that you contact several of the members of the Industrial Perforators Association to see if they already own a die which will produce the pattern you want.
http://www.iperf.org/members.html
RE: TRIANGULAR PERFORATION........
And i think $40,000 for a perforating die is toooo much..
i make hardened round hole dies in my factory which costs only $600, i dont know how a die can cost $40,000, and the die which i make dont even crack and last very long.
RE: TRIANGULAR PERFORATION........
RE: TRIANGULAR PERFORATION........
It's also the reason why a lot of shops specialize in doing nothing else but laser cutting; they keep their machines cutting continuously, and that's how they pay for them. Cutting is their only business, and there are enough of them out there to keep the price reasonable.
Quotes are free. Ask.
Mike Halloran
Pembroke Pines, FL, USA
RE: TRIANGULAR PERFORATION........
This is gist of the first page:-
Many dies are formed of sections instead of being cut from a solid piece of steel. This sectional construction is employed more particularly for large dies, especially when the form is complicated. There are two principal reasons for using the "split" or sectional die. One is that it sometimes happens that the blanks to be cut are of such a shape that the die can be made more quickly and cheaply than by making a one-piece die. The other reason is that when the required blank must be of accurate dimensions, and there is a chance of the solid die warping out of shape in hardening, the split die is preferred, because it can be much more easily ground or lapped to shape....
RE: TRIANGULAR PERFORATION........
Thanking you in advance.
RE: TRIANGULAR PERFORATION........
There is still an argument to split dies for ease of maintenance and also manufacturability depending on what equipment you have available to you.
To answer your question spieagle the less apertures you have in any one section the easier it is to line up, but you also need to line up more parts. Add to this you will need to screw and dowel each section, which will limit the areas you can pierce in so the tool gets much larger, it is all a balancing act.
RE: TRIANGULAR PERFORATION........
BUT what is your tolerance of each hole?
Would water jet or plasma work?
Dan Bentler