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Production of Steel Shot

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?

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Production of Steel Shot

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

  2. Introduction • Background • Process Overview • Calculations • Conclusions

  3. 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

  4. 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.

  5. 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.

  6. 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

  7. Calculating terminal velocity of the droplets for each atmosphere

  8. Finding the heat transfer coefficient for each process

  9. Calculating Biot Numbers

  10. Calculating Cooling Time and Chamber Height

  11. Void Area fraction

  12. Bed Thickness

  13. Velocity of Air

  14. Cooling in Fluidized Beds

  15. Cooling in Fluidized Beds continued

  16. 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)

  17. Sources • Dr. Hackney’s wonderful class notes • http://encyclopedia.airliquide.com/encyclopedia.asp • http://chem.lapeer.org/PhysicsDocs/Goals2000/Laser1.html

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