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Mass-Finishing
Basic processes and technologies Dierk Telljohann Dipl.Ing.(FH-D) OTEC Präzisionsfinish GmbH Dieselstrasse 8-12 75334 Straubenhardt www.otec.de
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Table of content:
• Definition and Discription
• Processes of Mass-Finishing • Parameters
• Examples
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Definition and Discription
Nearly every industrial made workpiece will cause a step of grinding or deburring during the manufacturing process Mass-Finishing in the industrial use are grinding processes with use of grinding stones or granules. The workpieces will be put into barrels or containers. This containers are filled with this grinding stones –we will call them chips - water and additives. Some processes get done dry. Generated through the movement of the working-container or/and the movement of the workpieces, the grinding process starts. Depending on the way of movement, the processes are specified: .
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Mass-Finishing with Tumblers
Tumblers are vibratoy barrels which are flexible mounted with springs. The movement of the barrel is proceed by unbalance-motors. The complete content will oszillate after starting of the process. The different mass moments of inertia will cause the movement and the pressure bewtween chips and workpieces. This is the reason, why small and light workpieces can not be really addapted to this process. Or the running time will be extremely long.
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Advantages and Disadvantages
Heavy loads are possible
Systems for move-trough processes are available
No light and/or small workpieces
Long running times neccessary
Exchange of chips is complex and expensive
Separation of chips and workpieces is complicated
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Barrel-Finishing
This is one of the oldest systems. A barrel, in further times from wood, now made from steel, is covered at the inside with rubber or a special Polyurethane. Slow movement allows to treat very thin and long workpieces
Not enough pressure and speed to grind hard materials
No change of water during process time – no rinsing/cleaning of the workpieces
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Centrifugal Disc Finishing
This technologie was develloped for short running times and light workpieces. The number of rpm of the basic disc in the container causes working times, which are factor 10 and more quicker than before. This open system allows also to insert stops and rinsing times during the operation. You can work in steps; • Degreasing • Grinding • Polishing can be done without changing media or/and the container.
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Movement:
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All this shown processes causes more ore less heavy
damages between the workpieces.
If you have to avoid this, you have to work with only one single
part in the machine, ore you can use one of the following
processes.
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Drag-Grinding or
Drag-Finishing:
Charges up to 60 WP‘s
Process-time: 30 min.
up to 3 h
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Streamfinishing:
up to 6 Workpieces
easily integratable in
automatic working lines
very short running times: 5
sec. up to 20 min.
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Comparision: DF/SF
DF SF
Movement Interaction of 3 rotations: Rotor,
holder, workpiece-selfrotation
• container-rotation
• workpiece-movement
Pressure • immersion-depth
• acceleration/decelacartion
depending at the
programmend speed
• V max: appr. 2 m/s
• fentrifugal force 10 g
• Immersion-depth
• angle of attack
• V max: appr. 15 m/s
• distance of the container wall and bottom
• dry or wet process
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DF-wet single-machine DF-3 S2
twin machine
grinding and polishing in 2 steps
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SF- applications
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Following parameters as an influence on the result of the
mass-finishing processes:
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Thanks for your attention!
Any questions?