Alpha Horizontal Centrifugal Casting Machines
| Fault | Possible Cause | |
|---|---|---|
| a | Lapping | Pouring too slow Metal not hot enough |
| b | Tube outer dia. rough | Protrusion of pouring bucketspout in bore beyond the end plate of mould |
| c | Slag/oxide bands produced | Inadequate deoxidizing agent in ladle |
| d | Bore tube oxidization | Temperature of metal too low. Mould temperature too low. Crucible/pouring bucket temperature too low. Furnace and casting pouring into mould delayed. |
| e | Rough tube surface at spray end | Mould not cool enough. Spinning time of mould insufficient to cool mould |
| f | Tube surface dimpled often at center | Low spin speed. Pressure of spray tank too high. Low metal temperature. Consistancy of mould wash too smooth. |
| g | Tube length incomplete or tapered tube wall | Mould contains refractory material, possibly from pouring bucket or furnace. Pouring bucket or sprout requires maintenance. |
| h | Spray end showing isolated patches of slag | Belling at either or both ends of tube. Check dimensions of mould. Check coating. Check mould temperature. |
| i | Casting difficult to remove | Belling at either or both ends of tube. Check dimensions of mould. Check coating. Check mould temperature. |
| j | Tube surface inconsistent (a spiral appearance may be produced) | Inadequate mould coating in tank. Spray cone nozzle worn or restricted. Coating slurry too thin. |
| k | Large diameter tubes longitudinal cracks in casting | Tube run on at high speed for too long after casting. |
| l | Surface of tube covered with pin holes, especially pronounced at spray end | Low metal temperature. Oil traces in airline (faulty liner). |
| m | Cracking/tearing fracture around circumference | Contraction of tube restricted. Mould wash left in mould, inadequate cleaning Belling - refer to i. |
| n | Patches of slag deposits on spray end of tube | Metal deposits require cleaning at furnace and/or ladle. |
| o | Pin-holing in patches and/or condensation | Lance dripping with spray or craters at spray end. Lance sloping downwards. |
| p | Molten metal raining in mould | Molten metal temperature too high. Speed too low. |
Gibson Centri Tech Ltd
Centrifugal Casting Machine Suppliers and Manufacturers
sales@gibsoncentrich.co.uk
Phone Number
00 44(0)1543 418701
Business Hours
Monday to Thursday 8.30am – 5.00pm
Friday 9.00am – 4.00pm
Gibson Centri Tech Ltd
Hilltop Works
Trent Valley Industrial Estate
Eastern Avenue
Lichfield
Staffordshire
WS13 6UY