Shear tube cutting
Shear tube cutting
(OP)
Hello,
I would like to have some guidance concerning a little subject that i'm treating.
We're using a machine to cut some aluminum tubes ( through shearing). Recently, due a change in the material ( still aluminum), some small cracks are developed on the surface sheared. I understand that the ductility of the material gives a rough surface, but in addition to this there are some small cracks. I would like to investigate into this by thinking of the different possible parameters responsible for this like strain rate..
Thank you in advance for your help.
I would like to have some guidance concerning a little subject that i'm treating.
We're using a machine to cut some aluminum tubes ( through shearing). Recently, due a change in the material ( still aluminum), some small cracks are developed on the surface sheared. I understand that the ductility of the material gives a rough surface, but in addition to this there are some small cracks. I would like to investigate into this by thinking of the different possible parameters responsible for this like strain rate..
Thank you in advance for your help.





RE: Shear tube cutting
Also how dull the blade is.
Unless you are facing these off enough to remove all of the cracks you are setting yourself up for some nasty failures later.
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P.E. Metallurgy, Plymouth Tube
RE: Shear tube cutting
Different tempers need different processing. I think it's a hardness problem, not ductility.
I think you need to experiment with your process to find out what works. Or talk to people who do this.
another day in paradise, or is paradise one day closer ?
RE: Shear tube cutting
RE: Shear tube cutting
trial and error to get the exact gap. there is manufacturing data out there for the starting gap.
RE: Shear tube cutting
We are now using T6 as a replacement to T9: I don't have the value of hardness of T9, but it seems to be harder than T6. T9 also has both tensile strength and yield stress bigger than T6 ( the range of 2XX to 300 MPa vs 3XX to 4XX). Moreover, the elongation ( ductility) is bigger for the T6 ( 5 vs 10)
It seems that T6 deforms more plastically before fracture(more than T9.
Concerning tearing in tension, i look into ( the length of the bar is small ( about 20 mm)