bigmark1972
Industrial
- Jun 11, 2003
- 56
Hello all, I am building a machine for our plant to cut large round tubing. Although I doubt I am going to get an answer here (it's a tough problem. I'd like to at least get some points in the right direction on where to go to get an answer.
The method of cut off will be the supported shear method.
Supported shear means a set of dies on the outside and one set on the inside supported by a long mandrel rod inside the tube. Basically one of the outside dies moves over, in turn pushing the internal dies over as well effectively "scissoring" the tube in the direction of movement.
Here is a picture explaining the concept:
![URL]](http://h[URL unfurl="true"]http://www.read-tpt.com/techartpics/tdrill12.jpg[/URL])
Normally this type of cutting effects a cut in two movements, over and down. This results in a bur and some other problems I wont get into here as they are not relevant.
My machine would move the tooling in an ever increasing spiral using 3 seperate actuators for power. I do not want to say here how I am doing it but the load is split between them. I can get cert sheet for the tubing being cut if needed. I can also provide die clearances etc if needed.For example 6" dia .079wall 409 stainless would be typical. The spiral could increase by any amount per spiral revolution but I am thinking around .005-.01 per rev.
Any ideas on who I would go to to get an answer for this proble? Anyone interested in trying to solve it? I do not have the math skills required so I figured I serve it up to some people more gifted than I.
Thanks
The method of cut off will be the supported shear method.
Supported shear means a set of dies on the outside and one set on the inside supported by a long mandrel rod inside the tube. Basically one of the outside dies moves over, in turn pushing the internal dies over as well effectively "scissoring" the tube in the direction of movement.
Here is a picture explaining the concept:
Normally this type of cutting effects a cut in two movements, over and down. This results in a bur and some other problems I wont get into here as they are not relevant.
My machine would move the tooling in an ever increasing spiral using 3 seperate actuators for power. I do not want to say here how I am doing it but the load is split between them. I can get cert sheet for the tubing being cut if needed. I can also provide die clearances etc if needed.For example 6" dia .079wall 409 stainless would be typical. The spiral could increase by any amount per spiral revolution but I am thinking around .005-.01 per rev.
Any ideas on who I would go to to get an answer for this proble? Anyone interested in trying to solve it? I do not have the math skills required so I figured I serve it up to some people more gifted than I.
Thanks