# Production of Steel Shot Josh Ball – Matt Calcutt – Sean Loney –

## Presentation on theme: "Production of Steel Shot Josh Ball – Matt Calcutt – Sean Loney –"— Presentation transcript:

Production of Steel Shot Josh Ball – jbball@mtu.edu Matt Calcutt – mtcalcut@mtu.edu Sean Loney – smloney@mtu.edu

Introduction Background Process Overview Calculations Conclusions

Background What is Steel Shot? – Tiny steel balls What is it used for? – Cleaning work pieces (Shot Blasting) Sand and Scale removal from castings, Surface prep for painting – Shot Peening – Granite Cutting – Non-Toxic Shotgun ammunition

Process Overview Molten Steel flows from a tundish and is made into a spray. The droplets (1mm diameter spheres) freefall in a cylindrical chamber containing a gas atmosphere. Upon reaching 1000C, they will land in a fluidized bed for further cooling.

Objective Determine what gas (He,Ne, Ar, Kr) in the vessel will result in the fastest solidification time, and therefore the shortest vessel. Determine the relationship between air velocity and cooling time in the fluidized bed.

Assumptions The steel shot will not deform on impact The conveyor movement will not impact the rate of cooling Density and size of particles does not change with temperature 1 Million pounds of shot would be produced in a 24 hour period

Calculating terminal velocity of the droplets for each atmosphere

Finding the heat transfer coefficient for each process

Calculating Biot Numbers

Calculating Cooling Time and Chamber Height

Void Area fraction

Bed Thickness

Velocity of Air

Cooling in Fluidized Beds

Cooling in Fluidized Beds continued

Conclusion Helium gives the smallest chamber height (13.63m) At 0.5m wide the cooling bed is 34mm thick The length of the cooling bed depends upon the velocity (0.56m to 1.5m)

Sources Dr. Hackneys wonderful class notes http://encyclopedia.airliquide.com/encyclope dia.asp http://chem.lapeer.org/PhysicsDocs/Goals200 0/Laser1.html

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