What is Vibro Finishing ?
In Vibratory Finishing the parts to be processed are charged in the bowl along with suitable Ceramic Media. As Soon as the machine is started a powerful spiral motion of the mass inside the bowl is generated. Now, because of the relative motion between media and the parts the necessary deburring, descalling, smoothening etc. is achieved. Hence we must make sure that the media and parts are moving freely inside the bowl.
Unlike tumbling where relative motion occurs only during half rotation and only at the top layer, in VIBRO-FIN Vibratory Finishing Machines there is continuous relative action through out the mass between media and parts. Hence we get the results much faster in VIBRO-FIN Vibratory Finishing Machine.What are the major parameters in vibro finishing ?The some of the major parameters that will affect the finishing performance are :
How to select proper Media ?Guidelines For Selection Of Media And Compounds First is to select one or more of the following objectives :
- Initial Condition of Part
- Part Media Ratio
- Size and Shape of Media
- Dosing Compounds
- Duration of process
- Degree of Vibration
a) Deburring :
- Burnishing or fine finishing
Use higher size high abrasive media. Usually above 10mm. In case the components are very small 3mm or 5mm grey media can also be used.b) Radiusing :
Use higher size high abrasive (grey) media. Usually 15mm or above (like triangles or cones).c) Descaling :
In deburring cycly use descaling compound.d) Finishing
Use lower size low abrasive media usually below 10mm (Cylindrical shape) with finishing compounds.e) Burnishing :
Steel Balls are recommended for very good results. For many applications corncob, saw, leather pieces etc. are used. Smaller size low abrasive ceramics can also be used.
While doing Ball Burnishing process make sure that balls are absolutely free from grease, oil & rust. The balls shine like Mirror, to get desired results. If balls are not of proper quality then polishing of the components will not be achieved.
It is recommended to clean/polish balls first.
For Ceramic Media Selection following point should also be considered.
The selected media should not clogged at any cavity / hole on the job.
In case part and media are to be separated by screening method then there should be sufficient size difference between size of media & parts for effective separation.
Size should be capable of doing required operation (deburring or polishing).Conclusion :
In Vibratory Finishing there are no fixed mathematical formula. Operator must spend some time initially for optimum results. Experience of working with machine will be most valuable asset to get best results from the machine.