"Secret" behind "honing"?!

Letter 9030

"Secret" behind "honing"?!

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What is there in "honing"? We are a leading manufacturer of DOM tubings in India and exporting world wide.

Recently we started manufacturing tubings suitable for hydraulic cylinder application.

Some of the customers say they can use the tubes as such provided the id surface finish is 0.60 RA max in micron scale and meeting the H-9 tol.but some of the other customers feel "honing" is a must.

We don't understand the reason behind this. Is honing carried out only to improve the surface finish and dimensional tol or anything else is there?

Can anyone help on this matter?

Thanks,

C.K.Sekar
- Chennai, Tamil nadu, India

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Sir,

For what its worth , size control and final rms finish of the part is operator dependant , if for example an operator were honing a cylinder bore, and was "overstroking" the work he would creat a venturi shape. If the same operator were to "understroke" the work, he would creat a barrel shape since the stone are spending more time in the middle of the work. it is also possible to get ta taper with still another "stroke" of the work. This same thing can happen in od honing, with variations in stroking technique the operator can create straight , convex, and concave shapes, as for the final finish , the operator may choose a corse stone with large stock removal in mind then switch to a finer stone that will meet the specifications of the print.

MY thought is ... if your tube "out of the box":

1. meets the rms requirement (which will be important for the backup rings and seals, especially in high pressure systems)

2. meets parallel requirement

I see no apparent need for the hone.

Brad Sawyers
- Racine, WI

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DEAR MR. BRAD SAWYERS,

THANKS A LOT FOR YOUR FEEDBACK ON "HONING". ACTUALLY WE HAVE ANOTHER DOUBT NEEDS TO BE CLARIFIED. NORMALLY THE TUBES ARE SUB-CRITICALLY ANNEALED TO RELIEVE THE INTERNAL STRESSES BEFORE HONING. BUT TO AVOID HONING THE TUBES WILL BE SUPPLIED IN "AS DRAWN" CONDITION WITH INTERNAL STRESSES. DO YOU THINK THIS MAY "AFFECT"THE PERFORMANCE?

LET ME THANK YOU IN ADVANCE FOR YOUR KIND ATTENTION ON THIS.....

C.K.Sekar
- CHENNAI, TAMILNADU, INDIA

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