×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

"knurling" on stainless steel

"knurling" on stainless steel

"knurling" on stainless steel

(OP)
Hello,

any tips on how this kind of "knurling" was made on this stainless steel pipe?
1) pipe was not deformed during this proces
2) it is not additionaly welded (however it looks like this) - this surface is "torned out" from pipe material
3) anyone knows machines which can do this type of surface ? (if not - I need to do some R&D'ing on my own)

thanks in advance

M

RE: "knurling" on stainless steel

Could be chemical etching?
It also looks like a bit like a very heavy spark eroded finish.


www.tynevalleyplastics.co.uk

It's ok to soar like an eagle, but weasels don't get sucked into jet engines.

RE: "knurling" on stainless steel

Maybe electropolishing gone out of control...
or corrosion in some aggressive environment.

Wait; you _want_ a surface like that?
Be aware that it may have greatly reduced fatigue resistance, not ordinarily a desirable thing in pipe or anything else.


Mike Halloran
Pembroke Pines, FL, USA

RE: "knurling" on stainless steel

Those are pretty, er, slick.

Mike Halloran
Pembroke Pines, FL, USA

RE: "knurling" on stainless steel

(OP)
JStephen & MikeHalloran:

this is the purpose, it is used in chairs as a shoes slip-protector
but it is made only on a small part of pipe, not fully around

thanks for a link to this ladder company

RE: "knurling" on stainless steel

Could this be spark deposition , then electro polished after buffing?
B.E.

You are judged not by what you know, but by what you can do.

RE: "knurling" on stainless steel

Possibly "sweeping" the surface with a plasma-arc cutter.

RE: "knurling" on stainless steel

I looks tome that the pattern is embossed (pressed into the surface). To do this you need to have an embossing roller made with your desired pattern.

RE: "knurling" on stainless steel

I don't have any certain answers, but I'll throw out a few reasons and guess.

The surface appears to have small nodules of material. I can't think of a material removal process that creates this type of shape. Though I'm not familiar with spark erosion or many plasma techniques.

I don't see much regularity/pattern in the textured surface. Therefore I suspect it's not an embossed or rolled surface.

Some kind of deposition might make that sort of texture, and could be done on only part of the surface.

As for chemical etching, the boundary between polished and textured surface is not a nice line that I would expect if you masked and etched.

Another clue is shown on the edge of the textured-polished boundary. There appear to be voids there. It looks to me like the high points in this area are ground and/or polished down, leaving only the low spots. Material deposition on one side followed by grinding/polishing could do this.

Is there much variation in thickness on the polished side vs. the textured side?

RE: "knurling" on stainless steel

Next, I'll guess that the extra texture was arc/flame sprayed, which is the only _fast_ process I know of that's capable of producing such a surface.

Mike Halloran
Pembroke Pines, FL, USA

RE: "knurling" on stainless steel

New or used pipes? Used: In what environment and process conditions? If new: impurities before (if any) surface treatment?

RE: "knurling" on stainless steel

Looked once more at the pictures. Guess that the clue is something wrong during the manufacturing process, for instance false heating/cooling combination at the end of the process? Try a moere metallurgic orientated forum?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources