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Re: [MW:12271] Material processing and Surface Finish in Ra

By Materials & Welding

Hi,

Please find below.

 

Surface Roughness Produced by Different Manufacturing Process

Knowing what manufacturing process can produce surface finishes that desired on a surface can be an added advantage while making the designs. Here is a table showing maximum and minimum Ra values can produced on each production methods.  
 

Process

Roughness Average, Ra ā€“ Micrometers Ī¼m

Maximum

Minimum

Flame Cutting

25

12.5

Snagging

25

6.3

Sawing

25

1.6

Planing, Shaping

12.5

1.6

Drilling

6.3

1.6

Chemical Milling

6.3

1.6

Elect. Discharge Machining

4.75

1.6

Milling

6.3

0.8

Broaching

3.2

0.8

Reaming

3.2

0.8

Electron Beam

6.3

0.8

Laser

6.3

0.8

Electro-Chemical

3.2

0.2

Boring, Turning

6.3

0.4

Barrel Finishing

0.8

0.2

Electrolytic Grinding

0.6

0.2

Roller Burnishing

0.4

0.2

Grinding

1.6

0.1

Honing

0.8

0.1

Electro-Polish

0.8

0.1

Polishing

0.4

0.1

Lapping

0.4

0.5

Super Finishing

0.2

0.025

Sand Casting

25

12.5

Hot Rolling

25

12.5

Forging

12.5

3.2

Perm. Mold Casting

3.2

1.6

Investment Casting

3.2

1.6

Extruding

3.2

0.8

Cold Rolling, Drawing

3.2

0.8

Die Casting

1.6

0.8

Above high and low values are typical for each production methods. But values other than high and low Ra can be obtained under special conditions for each process.

Thanks & Regards,

(Karthik)

Karthikeyan.S
QA/QC Manager
Getabec Energy Co.,Ltd.
379,Moo6,Soi8,Nikhomphatana,
Rayong-21180,
Thailand.
Phone: 0066 38 897035-8 (Off)
Fax: 0066 38 897034
Hand Phone: 0066 892512282


--- On Fri, 8/19/11, vaibhav Joshi <vnjoshi.leo@gmail.com> wrote:

From: vaibhav Joshi <vnjoshi.leo@gmail.com>
Subject: [MW:12270] Material processing and Surface Finish in Ra
To: materials-welding@googlegroups.com
Date: Friday, August 19, 2011, 12:57 PM

Dear all,

can any one tell me avg surface roughness value in Ra with respect to material processing ( Grinding ,Machining, etc) ?

Regards,
Vaibhav Joshi


     rr
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