PART 1 The Case for Superior Blast Wheel / Turbine Efficiency
Your blast wheel is the “business end” of you shot blast machine. It is the main component which delivers the blast media and performs the blast cleaning or peening process.
Its performance is vital!
Not only is the blast wheel vital, it is probably the more expensive single item on the machine in terms of performance, productivity, time, maintenance, repair and wear part costs.
Focusing on your future
Our support maintenance engineers report on the fact that on most visits to all makes and process types of blast machines, they find that the blast wheel(s) are underperforming and their set up is under-optimised.
The Research and Development engineering team have produced two alternative blast wheel types according to the application and economic judgements, and set a new significant milestone in the continuous technical improvement of blast turbines, considering the following effects in design:
Performance has a cost effect
Productivity has a cost effect
Time ... costs
Maintenance has a cost
Repairs … cost
Wear Parts replacement cost
A smooth abrasive transfer from the impellor through the aperture of the control cage on to the end of the vane or blade, enables the use of more of the available energy. The effortless flow avoids unnecessary impingement of the vanes or blades and ensures an ideal delivery as a long or wide blast pattern. This thoughtfully considered design provides an additional advantage by allowing the blast media to flow with significantly less breakage of the media itself, providing less consumption.
The blade is designed and shaped to facilitate all the abrasive to leave the vane at tip speed rather than a more scattered approach, delivered as one would in a game of tennis! The curvature of the "Y" or "C" throwing vane or blade increases the blast media delivery speed.
Less processing time up to 77% higher blast-efficiency and optimised operating-cycles.
This 77% figure is based on the following facts:
- Lower wear part replacement costs
- Wear part durability and manufactured material choices
- Efficiency of electrical energy consumption and utilisation
- Efficient delivery and optimised mechanical flow of blast media
- Less blast media consumption
- Increased blast media delivery speed (media velocity)
- Increased machine uptime and availability
- A substantial elimination of regular maintenance requirements
Due to the additional performance advantages, the speed of delivery of the blast media (velocity) is increased between 10% to 90% faster according to the diameter size and type of blast wheel chosen.
This means that it is possible to use a smaller blast media than at present, achieve a faster coverage because of more particulates being available in the same volume and the increased particle speed (velocity).
Typically and for example, where abrasive sized S230 shot or SAE G25 grit is presently employed, the number of particulates in 1 kilo is likely to be approximately 920,000 (new) Steel Shot or 550,000 as (new) Steel Grit. By changing the blast media to a smaller size, of say, S170 or SAE G40 (new) steel grit, and utilising the additional velocity achieved from the superior blast wheel it will still perform the process successfully. The increase in the number of media particulates or pellets will increase to approximately 2,600,000 of S170 and 2,360,000 for GL40 and the productivity will increase by an extra 50%.
That is up to half the blast time saved!
Time … costs you money!
For more information on Superior Blast wheels and Retrofit opportunities visit www.rosler.com
Post written by
Shot Blasting Technical Manager