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Generating Chamfer 2

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11991

11991

Mechanical
Dec 28, 2004
57
We are punching an elliptical hole through a conical surface in a part approx .250" thick. I am trying to design a tool to "coin" an angular face around this hole. The tool is approx .250" larger than the hole all around. I have not been able to generate the chamfer surface. I could do a chamfer on the hole in the part but I need to be theopposite of this to be the tool.
I have been trying to do the chamfer on a .250 thick wall shape of length and inside dimensions of the hole. I am trying to get a chamfer follow the curved edge at the inside of the shaped piece.
I am not sure if I have presented this clearly or not.
I could send a file if possible.
Thanks
 
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Depending on the version of SW you have, look at the Indent feature and Forming Tools in Help.

[green]"Art without engineering is dreaming; Engineering without art is calculating."[/green]
Steven K. Roberts, Technomad
Have you read faq731-376 to make the best use of Eng-Tips Forums?
 
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A screen shot would definitely help. See faq559-1100 for posting images.
See faq559-1177 for posting files.

[cheers]​
Helpful SW websites faq559-520​
How to find answers ... faq559-1091​
SW2006-SP5 Basic ... No PDM​
 
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I'm unable to see the file. Moolod dosen't work for me.
 
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Are you trying to make a dimple-punch through the "wall" of that part", but instead of a round hole you want an elliptical hole? Am I understanding that correctly?

SW06 SP5.0

Flores
 
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I am not explaining this correctly. We are punching a hole in a part that is a low cone, approx 25" dia and 6" high.
After punching, and with the same tool we want to be able to form a 45deg chamfer around the edge of this hole. The part I uploaded is the chamfer forming part of the punch. We are unable to machine the punch/form tool because I have not been able to Model it.
I hope this makes a little more sense.
TIA
 
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So it does sound like you are trying to make a dimple punch, but instead of a round hole, you want an elliptical hole. A dimple punch both punches a thru hole and gives it a chamfered shape so that a counter-sink screw head will seat flat. This deletes the the step of countersinking a punched hole.

regular_dimple_punch

In SW sheet metal, you would use the emboss tool
emboss

to get this
dimple_punch

You do not want to create the sheet metal part, but instead you want to make the PUNCH/TOOL to create the elliptical shaped dimple punch. Is this correct?

If Chamfer Cylinder.SLDPRT is supposed to be the punch, then you might want to look at the first link above as a design gude.

Are you punching 1/4" thick aluminum or hot-roll-steel? If it's steel, then a lot of tonnage will be required to punch that much surface area. You might want to consider a secondary operation, 1 for punching, the second using this tool you want to make.

SW06 SP5.0




Flores
 
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I must be leading you astray. What I am trying to do is this.
After piercing a hole of irregular shape,(ours is shaped somewhat like the uploaded part)we need to coin(displace metal) a chamfer around this irregular shape using a tool which has a shape the same, but just slightly smaller(.06") around the shape to make sure it reaches inside the ID.
We are piercing thru .230-.280 mild steel thru a surface that is on the inside on a cone.
My problem is that when I extrude the shape of my punch plus .25 around to increase the size to use this land for the coin area, then sweep cut the surface to get desired contour, when I use a regular chamfer command the chamfer width varies inward differently around the shape.
I tried to sketch a shape with a 45deg side and sweep-cut the shape but I can not get it to go.
I sorry for the long sentences but I didn't know where to stop.
 
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Is this what you are trying to do? The model could be your punch or your die depending on which side of the part you are coining from.

I would make the punch body square or rectanglar, with a corner knocked off to act as a poka yoke feature for locating in the punch holder correctly.


Regards,

Anna Wood
SW06 SP4.1 x64, WinXP x64
Dell Precision 380, Pentium D940, 4 Gigs RAM, FX3450
 
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If what I sent you is not what you need, can you upload a patch of the actual part you are coining with the hole (the part coming off the tool not the tool).

Then we can work to model a punch and die insert for you from that.

I think your example may be to generic for what you are really trying to accomplish. You mention you are coining on a curved surface in an irregular shaped hole.

Regards,

Anna Wood
SW06 SP4.1 x64, WinXP x64
Dell Precision 380, Pentium D940, 4 Gigs RAM, FX3450
 
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Another thought, since you already have the part modeled and the chamfer is working for you in the part.

While in the assembly for the tool, select the surface/faces of your part and do a zero distance offset of those surfaces while editing your punch model. Use those surfaces to build your punch from.

Regards,

Anna Wood
SW06 SP4.1 x64, WinXP x64
Dell Precision 380, Pentium D940, 4 Gigs RAM, FX3450
 
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To CorBlimeyLimey,
YES!
This is exactly what we are trying to do. Now how do we transfer this to a coin/punch to make this happen. We were able to get to this point but not able to model the coin/punch for this.

To AnnaWood,
Please see CorBlimeyLimey link for the answer to your question.

Thanks to all for answering. It looks like there is an answer in the near future.

Thanks
 
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11991 ... The next step could be as AnnaWood suggested in her last post.

An alternative is to offset the surfaces required for the Coining Tool and then use those (Extend, Trim, etc) to create a non-merged solid body. That body can then be saved as a separate but associative part.


NOTE: This file has two configs. One showing the finished part, the other showing the offset surfaces.

[cheers]​
Helpful SW websites faq559-520​
How to find answers ... faq559-1091​
SW2006-SP5 Basic ... No PDM​
 
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CorBlimeyLimey, thanks for creating the model. Much clearer on what 11991 is trying to do.

Yep, I would use the surfaces already created in the part to create the tools. This is a common technique, especailly for those tool designers that are designing tools for parts with complex drawn features.

Here is an example for you. Should give you an idea of the technique you can use.


Regards,

Anna Wood
SW06 SP4.1 x64, WinXP x64
Dell Precision 380, Pentium D940, 4 Gigs RAM, FX3450
 
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Thanks again, but I am still somewhat confused.
I seem to be OK thru adding Plane1 and Extrude Cut for Punched Hole.
Is there a reason to use:
Why did you Revolve-Thin2
then Surface Offset .125
then Surface Offset .010
instead of a Part Contour?
After gettin Part/Hole drawn, what's next?
How do you end up with Punch when all else is finished?
Sorry for so many questions.
 
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I'm not sure if you still need answers to the following questions but ...

"Why did you Revolve-Thin2"
Why not? There are several ways to produce most solid shapes. That was the first one that came to mind and involved the least amount of work to produce a flat cone.

"then Surface Offset .125"
That offset was for later use in creating geometry for creating the chamfer.

"then Surface Offset .010"
I didn't create that one. Maybe AnnaWood will explain.

"instead of a Part Contour?"
I don't know what you are asking here.

"After gettin Part/Hole drawn, what's next?
How do you end up with Punch when all else is finished?"
After creating the punch as a multi-body, RMB select it (from the "Solid Bodies" section of the FM tree) and "Insert into New Part".

[cheers]​
Helpful SW websites faq559-520​
How to find answers ... faq559-1091​
SW2006-SP5 Basic ... No PDM​
 
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The .010 Offset is so your punch does not smack up against the die surface inside the hole. Depends on how you build your tool if you will need to do this. You could do a zero distance offset if you would like.

You need the surface so you can enclose the surfaces water tight, thin you can do your knit into a solid to create your punch.

Regards,

Anna Wood
SW06 SP4.1 x64, WinXP x64
Dell Precision 380, Pentium D940, 4 Gigs RAM, FX3450
 
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