CDA360 Brass alternative?
CDA360 Brass alternative?
(OP)
Hi Guys,
We manufacture parts that must be machined into a cup shape (.500" OD x .400" ID x .500" Lng - .06" thk wall on bottom). The bottom gets "bumped" after assembly with a .25"R spherical nose tool, dimpling the part into shape.
Problem is, while the part machines perfectly, the cold forming "bump" process causes cracking. The suspect parts and bar stock were checked and found to be 75B Rockwell which I believe is the spec for Annealed state.
Question: Is there a better copper alloy (e.g. CDA353 Brass) that both machines well, cold forms well and is readily available in 1" dia bar stock?
We manufacture parts that must be machined into a cup shape (.500" OD x .400" ID x .500" Lng - .06" thk wall on bottom). The bottom gets "bumped" after assembly with a .25"R spherical nose tool, dimpling the part into shape.
Problem is, while the part machines perfectly, the cold forming "bump" process causes cracking. The suspect parts and bar stock were checked and found to be 75B Rockwell which I believe is the spec for Annealed state.
Question: Is there a better copper alloy (e.g. CDA353 Brass) that both machines well, cold forms well and is readily available in 1" dia bar stock?





RE: CDA360 Brass alternative?
RE: CDA360 Brass alternative?
This sounds like a stamped/drawn part, not machined from bar. A 1:1 draw ratio is nothing for these grades. Look at cartridges.
And annealed brass should be a lot softer than RB75.
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RE: CDA360 Brass alternative?
TVP - You are correct - the best way would be stamping / drawing the cup out of 260, but unfortunately we are in a situation where everthing revolves around CNC machined parts and tooling up for stamping isn't an option (qty's are too low to justify the expense).
RE: CDA360 Brass alternative?