die punch design
die punch design
(OP)
we do extruded hole operation. the extuded hole cracks up after brazing. i heard about thumb rule to give radius on die punch. will any body share information
help please
kkg123
help please
kkg123
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RE: die punch design
RE: die punch design
Chris
SolidWorks/PDMWorks 08 3.1
AutoCAD 08
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RE: die punch design
If it is the open end try machining or forming a chamfer on the underside of the pierced hole, when you pierce a hole the bottom end is full of very small cracks in the breakaway, the part that is die size, these will only get worse when you stretch them in the extrusion.
If it is the other end consider putting or larger radius on the die and also polishing the die and forming punch and even coating them. A full radius is not the best way to form the extrusion either most punch manufactures do specials for this look at Lane, AWPrecision, Porter or the like websites for information.
RE: die punch design
i heard that the die punch radius is dependent on thickness of sheet.
RE: die punch design
RE: die punch design
RE: die punch design
It would appear that you are brazing a copper rod or tube into a stainless or nickel-alloy vessel wall? Perhaps using a silver (Ag) containing braze alloy, such as a BAg-8 or similar. Most of all - it looks like the crack has braze alloy in it, from your photo. This is a symptom of liquid metal embrittlement - residual stress in the parent metal, combined with the dissolving power of molten silver to nickel alloys, cause rapid crack growth (similar to SCC). Try annealing the parent metal, or using a braze alloy without silver content, or reducing the silver content. Others (metallurgists) here should be able to offer more help to solve the LME problem.
RE: die punch design
RE: die punch design
can some one throw light on liquid metal embrittlement.how to avoid it
RE: die punch design
RE: die punch design
RE: die punch design