The Function of Wood Chips, Compound and Oil in Tumbling Process
Dear sir,
I am manufacturing a washer out of flapper valve steel, the size of the washer in millimeters is OD19, ID8, TH00.152. I would like to know what media & compounds I need to add to the barrel to achieve radius at the edge of the washer & also the tumbling process should result in burr removal.
Regards,
Ashish Asher- Mumbai, Maharashtra, India
All media sizes, shapes, and compositions will work or do something to your parts. The question is the ease of separation of the media from the parts and what kind of finish is going to cover the part after processing. I suggest maybe a 1/4 inch or 6 mm size medium to fine cut ceramic angle cut triangle depending on the amount of burr to be removed. Are there any holes? If parts are to be plated, the finer media would achieve a better looking and more uniform coated finish, but it will also take longer. If the surface finish is not important use a fast cut media shape.
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AF Kenton Nova Finishing Sytems Inc. - Hatboro, Pennsylvania |
March 22, 2011
I am in-charge of the surface treatment of titanium materials like plates and wires. Surface treatment includes grinding and up to polishing thru tumbling process. I need to control and lower down the variations on the surface after polishing. The materials I am using are wooden tumbler, wooden chips, oil and grinding compound. My questions are;
First, what are the functions of media, particularly wooden chips, the oil and the compound? How do they work?
Second, how can I control the mixture of these 3 materials to better control the outcome of surface treatment of titanium parts within the load batch and from batch to batch?
Third, is it normal to produce ball compounds inside the tumbler after some time?
Process Manager - Olongapo City, Philippines
March 29, 2011
First of all a mass finishing system is based on 3 factors. The equipment provides the mechanic energy to the media/abrasive and the liquid provides the lubrication and maintain cleanliness of media and parts. Next the size of the media and/or abrasive in the media determines how fast the system works. The finer the abrasive the finer the surface finish.
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AF Kenton Nova Finishing Sytems Inc. - Hatboro, Pennsylvania |
April 18, 2011
Wood chips are good polishing media because they are soft and easily smooth down any rough surfaces to give a nice reflective layer. Many good quality gold pen nibs are polished in rose petals! The addition of oils and other media are there to improve the polishing characteristics of the medium
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Trevor Crichton R&D practical scientist The Pheasantries - Chesham, U.K. |
May 18, 2012
Q. I am making a washer of OD: 33mm, ID: 12mm, thickness: 1.05mm. Raw material of washer is SK5 hardness after heat treatment is 54-56 HRC. After heat treatment we do tumbling operation for 3-4 Hrs with 8mm cylindrical & 24mm triangular ceramic media. But after tumbling we are not able to remove complete burr at ID of washer.
- Indore, MP, INDIA
A. From the visuals, I'd say you have a condition caused by dull tooling. The burr appears to be parent metal. Meaning that it is more than a burr. It is part of the shape of the part caused by the tooling. You can attack it more aggressively with larger ceramic media shapes, but that may also effect some other dimensions. Correct the tooling and you don't need a long intensive deburring process.
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AF Kenton Nova Finishing Sytems Inc. - Hatboro, Pennsylvania |
