O/T Large Parts Deburring / Tumbling

[Dan Schnars]

I am in the process of coming up with a better way to deburr / polish our cast iron cylinder blocks after machining. Right now our process involves about 6 hours of manual die grinding / cartridge roll work to deburr and polish every one of the parts as they come from machining to assembly. We are turning out about 6 parts a week and any process that can free up a slave... er... operator is going to help production a ton. Basically the process entails removing any sharp edges the machine can't chamfer and polishing the casting's internal surfaces to remove any casting sand or slag that might work itself loose while the engine is running. I'm looking for ideas how anyone out there with similar parts would approach this. I'm leaning toward tumbling. Any critical surfaces can be plugged or covered. Parts weigh about 200 lbs. and roughly measure 10 x 17 x 21 inches. Your basic V-8 automotive cylinder block. Anyone with any experience with parts this size I would appreciate the input... Thanks in advance!

[robk]

Hi Dan,

 

I have never tumbled parts that big. I'm not a big fan of tumbling to begin with, but there is a reason for everything.

 

Try doing a search on the forum for brush deburring, maybe that will suit your purpose. It was covered not too long ago.

 

Rob

[MACHINEMASTERG]

what robk said we just started brush deburring in the machine and it works great look at WWW .ABTEX.COM they will even take one of your parts to thier in house lab and develop a deburring stratagie for you and offer other suggestions !!!!they have nice stuff for the inside bores too!!!!

[chad fisher]

Hi Dan, cant help with the deburring but would really be interested in set of cylinder heads though. Just kidding

[Scott Bond]

Hi Dan

 

I would ask for a Demo from a Brush manufacture. Then have Hydropolish sevice company bid, and do a part after the brush does all it can. If it works , you invest in new equipment, if it don't you could try something else.

[Trevor Bailey]

Check out this link.

 

It is for washing and deburring.

[TheePres]

Look into process called extrusion honing, works great for parts with internal cavities. Extrude Hone Process

 

[ 12-05-2003, 01:03 AM: Message edited by: TheePres ]

[Scott Bond]

+1 on the Extrude Hone Process

[Dan Schnars]

Thanks for the help... Checking out the brush deburring as well as tumbling... Not a huge tumbling fan either, but I'm more in favor of that than the way its getting done now... I've seen Extrude Honing on cylinder head and manifold ports before but I can't really apply it to this, I'm trying to get the outsides / surfaces deburred... I appreciate all the help! Thanks again!

[Guest CNC Apps Guy 1]

I use brush deburring in combination with chamfer/edgebreak. I have some parts that I programmed that only need to have the remainder of the tabs dynabraded off and they are ready for outside processing. I don't like to leave it to operators, too much inconsistency for my liking.

[Eric S.]

hello

 

Here is an idea just brain storming here. If you are machining new castings and not rebuilding. I am wondering if you could first just machine the oilpan face. Then have a manifold that bolts onto this face for the Extrude Honing material to be fed through. Then the block can be finish machined and at least the crankcase will be polished. This it purely hypothetical I do not know if the Extrude Honing would get into all the corners. Just throwing out an idea.

 

 

Eric Salsman

[Dan Schnars]

I've been doing some homework on the extrude honing process and I'm not sure of the practicality of it for a piece this size with the equipment we've got... The brush deburring looks like it might work... Have to do some homework on that too... I've been running around here putting out fires here the last couple of days, sorry I haven't written back sooner...hopefully tomorrow I can do some looking... Appreciate the help!!!