de-bur, tumble, disc spring
2

Question

de-bur, tumble, disc spring

dho (Mechanical)

(OP)

6 Mar 15 16:03

The stamped belleville disc springs always have some burs on the I.D. at the concave side. Anyone has successful tumble de-bur case ? Our disc spring is .500 O.D., .150 I.D. Any suggestion on type of stone and stone size?
Thanks.

MikeHalloran (Mechanical) · Answer 1 · 2015-03-06 17:33:54

I don't like to scratch springs, e.g. with stone media.
I'd try steel shot, say .22 to .38 diameter.

Mike Halloran
Pembroke Pines, FL, USA

ornerynorsk (Industrial) · Answer 2 · 2015-03-06 18:02:57

What is the spring material, hardness, and thickness? Mechanical deburring with a radiussing type tool would be a better choice. Shot blasting or shot tumbling may only peen or fold over the burr and cause unpredictable stress risers.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

dho (Mechanical) · Answer 3 · 2015-03-06 18:13:49

302 stainless steel. full hard. in 55 HRc range. .025" thick.
annual quantity 20,000.
thanks.

swall (Materials) · Answer 4 · 2015-03-06 20:59:08

My former employer made a sheetload of SAE 6150 Bellevilles. They were de-burred in a vibratory media (stones that looked like pieces of Purina Cat Chow ). The de-burr process was about 2 hours long in order to round the stamped edges to a radius. But, in consideration of Mike's concerns, they were shot peened after de-burr.

HJBittner (Mechanical) · Answer 5 · 2015-03-18 19:05:11

I worked for five (5) years with a Belleville Washer manufacturr. We used rotary vibrating tubs and varied the medium based on size and hardness of the material.

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