Material Conditions on drawings

[marshell]

When specifying a material on a drawing, is the finished temper to be listed, or is the pre-machined condition listed with the temper\heat treat requirements added in?

As an additional question... Do part normally get tested post heat treat, or is certification of time\temperature of the heat treating good enough?

Thank you,

 

[greenimi]

Y14.5-2009

o) Dimensions and tolerances apply only at the drawing
level where they are specified. A dimension specified
for a given feature on one level of drawing (e.g., a detail
drawing) is not mandatory for that feature at any other
level (e.g., an assembly drawing).

 

[CoryPad]

It is typical for the final part drawing to list the required material conditions like heat treatment, surface finishing, etc.

Usually, parts get tested rather than relying on a certificate.

 

[drawoh]

marshell,

Your drawing specifies what you will accept from your vendor. If you want heat treatment, call it up. It is a good idea to specify that your dimensions and tolerances apply after finishing.

--
JHG

 

[CheckerHater]

Relevant link:

https://www.pmpa.org/technology/design/heattreatment.htm

"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future

 

[dgallup]

We ALWAYS specify both the raw material and any secondary operations such as post machining heat treatment or plating. For most raw materials we require chemistry and depending on the application may require hardness, tensile strength, grain size or even magnetic properties. For a lot of critical bar stock we also require ultrasonic crack inspection. Heat treatment or plating specifications always have pass/fail requirements for hardness, case depth, plating thickness, etc. There may well be other tests for toughness or adhesion, etc.

Our drawing format has individual blocks for the raw material specification, the heat treatment specification and the finish specification (paint, plating, etc.). If you can't put it in one line in the block then either reference a note or if you can't write it in a couple of lines of a note then write a detailed specification and reference it in the drawing format.

I know some people say you should only specify the final product but after we spend 4 years qualifying a design that was made from bar stock the last thing on earth we want is some supplier to start using powder metal blanks or vice versa. We actually do most machining in house as well as heat treatment but sometimes we get too busy and have to outsource. It's critical that parts we buy outside have the same provenance as parts we make.

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[RathodAsit]

Marshell, usually we prefer to give Material and painting(Paint shade, paint thk,paint type)info in Parts Drawings, in Assembly drawings only balloning and assembly instruction is there.

 

[KENAT]

Define the finished article as others mention, where the 'process' materially affects the end product then it is entirely appropriate to detail on the drawing per ASME Y14.5M-1994 section 1.4 e.

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