how to roll this into a frustum of cone in proe sheetmetal?

[rohit_rajan]

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[TomD.inPDX]

I am going to suggest doing this backward... make the form and then unfold it.

See attached.

[rohit_rajan]

Thanks Antonius.

I have used the same method. just wanted to know is there method to roll a flat sheet in Pro/sheetmetal?

[TomD.inPDX]

I haven't found a way to make a variable bend radius. Hopefully someone will show how its done.

[rohit_rajan]

the problem is i have the cone development dimensions only..trying the reverse method..but they do not match with the development dimensions after i flatten the cone.

[TomD.inPDX]

I figured that was the case. It takes a bit of math to understand what the form would be folmed. Fortunately, and I haven't tried this yet, but there has to be a formula to get the angle of the edges to know the angle of the axis in relation to the cone center.

The problem is the stretch and crush (K-factor) . However, with the known K-Factor you can also interpolate the radius at several points to know what you need to use for an offset between the solid and the axis. Both radii sould be coincident if it is a regular cone, so you can work the radii position from the apex.

Once you match up the edges on an unfold operation, you can use the "master" to trim the smaller and larger circle on the ends. After a bend back, the edges will still match up and the ends will be correct.

[gkoch]

There is no function in Creo Parametric that allows to bend about an axis which is not parallel to the fix edge.

But as Antonius mentioned, it should be possible by some formula.

If you want to avoid mathematics, you can also use a simple construction approach by sketching two circles to correspond to the circular edges of the cylinder and a line to connects the two "orbits", which represents the fix edge when unbending (equal to the barrel length)

If you use perimeter dimensions in the sketches, you can simply enter the values measured from your flat geometry to drive the sketcher dimensions. This is because the edge lengths are the same in bend and unbend state.

The sketched line (Sketch4 in the picture) can then be used to generate the cylinder revolving about A_1.For solid geometry thicken the surface, depending on which edges you measured.

You may want to cover for stretch by applying to the measured dimensions as needed.

If you rip and unbend, you can control, whether the geometry is as expected.