BURNISHING PROCESS(SUPER FINISHING PROCESS)

THIS PRESENTATION IS ABOUT THE BURNISHING PROCESS.BURNISHING IS A SUPER FINISHING PROCESS.WHICH IS A VERY IMPORTANT PROCESS IN PRODUCTION AND DEVELOPMENT OF A PRODUCT.THE PROCESS IS EXPLAINED IN SIMPLE WORDS AND IN UNDERSTANDABLE FORMAT. THE BURNISHING PROCESS IS VERY IMPORTANT IN INDUSTRYS

1. BURNISHING BY : JOHNS JOSEPH

2. BEFORE STUDYING BURNISHING ,WE NEED TO KNOW ABOUT COLD WORKING

3. COLD WORKING , ALSO KNOWN AS  STRAIN HARDENING  OR  WORK HARDENING , IS THE  STRENGTHENING  OF A METAL BY  PLASTIC DEFORMATION

4. THE MICRO IMAGE OF A METAL IS LIKE A MOUNTAIN RANGE

5. BURNISHING IS THE PLASTIC DEFORMATION OF A SURFACE DUE TO SLIDING CONTACT WITH ANOTHER OBJECT.

6. Visually, burnishing smears the texture of a rough surface and makes it shinier. Burnishing may occur on any sliding surface if the contact stress locally exceeds the yield strength of the material. It is a super finishing tool giving a mirror like finish.

7. MECHANICS IF THE BALL IS PRESSED DIRECTLY INTO THE PLATE, STRESSES DEVELOP IN BOTH OBJECTS AROUND THE AREA WHERE THEY CONTACT . AS THIS NORMAL FORCE INCREASES, BOTH THE BALL AND THE PLATE'S SURFACE DEFORM.

8. IF THE FORCE ON IT IS SMALL AND WHEN THE FORCE IS RELEASED BOTH THE BALL AND PLATE'S SURFACE WILL RETAIN ITS ORIGINAL SHAPE. IN THIS CASE, THE STRESSES IN THE PLATE ARE ALWAYS LESS THAN THE YIELD STRENGTH OF THE MATERIAL, SO THE DEFORMATION IS PURELY ELASTIC.

9. THE BALL WILL PLOW THROUGH THE SURFACE AND CREATE A TROUGH BEHIND IT. THE PLOWING ACTION OF THE BALL IS BURNISHING.

10. #BURNISHING

11. EXCESSIVE BURNISHING LEADS TO SUB-SURFACE CRACKS WHICH CAUSE SPALLING, A PHENOMENON WHERE THE UPPER LAYER OF A SURFACE FLAKES OFF OF THE BULK MATERIAL.

12. # LUBRICATION THE PURPOSE OF THE LUBRICANT IN THIS CASE IS TO SEPARATE THE COMPONENTS WITH A LUBRICANT FILM SO THEY CANNOT CONTACT TO PREVENT DESTRUCTIVE BURNISHING

13. THERE ARE TWO TYPES OF BURNISHING

14. #BALL BURNISHING #ROLLER BURNISHING

15. A BALL BURNISHING TOOL CONSISTS OF ONE OR MORE OVER-SIZED BALLS THAT ARE PUSHED THROUGH A HOLE.IT PLOWS MATERIAL OUT OF THE WAY #BALL BURNISHING

16. #ROLLER BURNISHING ROLLER BURNISHING, OR SURFACE ROLLING, IS USED ON CYLINDRICAL, CONICAL, OR DISK SHAPED WORKPIECES. THE ROLLERS TYPICALLY ROTATE WITHIN A CAGE, AS IN A ROLLER BEARING.

17. BY :JOHNS JOSEPH