WORKSHOP TECHNOLOGY- Sheet Metal Work

WORKSHOP TECHNOLOGY- Sheet Metal Work

1. Sheet Metal Work Tribhuvan University Institute of Engineering (IOE) Himalaya College of Engineering Laying out the patterns and cutting tin plates to desired shape and size Prepared By: Er . Amrit Tiwari Lecturer Himalaya College of Engineering

2. Introduction Sheet metal is simply metal formed into thin and flat pieces Sheet metal working deals with the working of metal sheets Black iron sheet- u ncoated sheet, cheapest, prone to corrosion. Galvanized iron sheet-zinc coating on surface, rust resistance and good looking. Copper sheet-reddish in color, good corrosion resistance, highly ductile and malleable. Tin plates-iron sheets coated with pure tin, silvery appearance and good resistance to corrosion. Brass- alloy of copper and zinc

3. Sheet metal operation Measuring ,marking and laying out The very first step of any sheet metal process Tools used-scriber, steel rule, steel square Shearing process Apply shearing forces to cut,or separate the material Forming process Cause the metal to undergo desired shape changes without failure, excessive thinning or cracking T his includes bending and stretching. Finishing Process Used to improve the final surface characteristics.

4. Measuring ,marking and laying out tools Try Square Center Punch Steel Rule Divider Scriber

5. Shearing process Punching Metal forming process uses a punch press to force a tool, called a punch through the workpiece to create hole via shearing Cheapest method for creating holes in sheet metal

6. Blanking Shearing process using a die and punch where the exterior portion of the shearing operation is to be discarded Parting Shearing the sheet metal into two or more pieces . Notching Removing a pieces from edges Shearing process

7. Sheet Metal Forming Bending and Stretching Manufacturing process by which metal can be deformed by plastically deforming the material and changing its shape Stressed beyond yield strength but below ultimate tensile strength

8. Types of Forming processes Air Bending V- Bending U - Bending Wiping Die Bending

9. Types of Forming processes Deep Drawing Roll Forming

10. Sheet Metal Tools Chisel Mallet Hammer Metal Hammer

11. Sheet Metal Tools Hand Shear Hand Seamer Rolling Machine

12. Sheet Metal Tools Folding machine

13. Sheet Metal Tools Foot shearing machine Notching machine