Inspecting bar stock for machining

[cjholl0]

My company will begin machining throttle shafts in-house and so we will need to inspect the bar stock as it arrives. We're using SUS 303 and 430F, maybe 12ft lengths. Does anyone have any thoughts on what to inspect the material for? I was thinkning straightness, verifying material certs, maybe some tensile testing...any ideas?

 

[dbooker630]

Are you buying direct from the mill or from a warehouse? Hot rolled, or turned & polished? You can write a material purchase specification to list your bar quality level, straightness requirements (ex. .25" in 60"), tensiles. If you're concerned about rolling defects the bars can be inspected prior to reaching your shop for seams, laps, objectionable nonmetallics, etc.

You can have many aspects of the bar inspected, depending upon the safety and functional requirements of the end product. More requirements may mean more raw material cost. You may want to consult with a materials engineer to help write a purchase spec. Even then if it is a safety part you may need to verify a few things. Hopefully this is a start.

 

[metengr]

Receipt inspections of material vary depending on the original material specification for purchase. Typically, I would concentrate on developing the material specification first to avoid having to perform the type of tests you mention on a routine basis at your facility.

Once you have a material specification, you can arrange to have periodic tests performed to sample the various heat of material that you receive at your facility. Examples of recepit inspection include dimensional checks, straightness, review of material test reports and sending out samples from each lot for mechanical testing and chemical analysis.

 

[IRstuff]

Why do YOU need to do the inspections and tests. It's ALWAYS cheaper to have the supplier do it, since anything that YOU reject incurs freightage and inventory costs.

The only thing that you might contemplate is to do spot inspections to keep your supplier honest.

TTFN

FAQ731-376

 

[arunmrao]

First thing you need to establish is the process of traceability. Once this process is set in motion all other requirements fall in place.



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