Stretch forming operations

Stretch forming operations

1. MANUFACTURING TECHNOLOGY – I CRAFTED BY: RAMESH KUMAR A Assistant Professor Sona College of Technology Salem 02-04-2018 11:26 1

2. STRETCH FORMING OPERATIONS 02-04-2018 11:26 2

3. STRETCH FORMING A piece of sheet metal is stretched and bent simultaneously over a die in order to form large contoured parts Stretch forming is performed on a stretch press, in which a piece of sheet metal is securely gripped along its edges by gripping jaws The gripping jaws are each attached to a carriage that is pulled by pneumatic or hydraulic force to stretch the sheet The tooling used in this process is a stretch form block, called a form die, which is a solid contoured piece against which the sheet metal will be pressed. 02-04-2018 11:26 3

4. STRETCH FORMING 02-04-2018 11:26 4

5. SPECIAL FORMING PROCESS Hydro forming Rubber pad forming Metal spinning forming Explosive forming Magnetic pulse forming Peen forming Super plastic forming 02-04-2018 11:26 5

6. HYDRO FORMING The hydraulic fluid is used as a flexible die in a deep drawing process of cylindrical components 02-04-2018 11:26 6

7. HYDRO FORMING 02-04-2018 11:26 7

8. RUBBER PAD FORMING Rubber pad forming is a metalworking process where sheet metal is pressed between a die and a rubber block, made of polyurethane Under pressure, the rubber and sheet metal are driven into the die and conform to its shape, forming the part 02-04-2018 11:26 8

9. METAL SPINNING 02-04-2018 11:26 9

10. METAL SPINNING… Metal spinning, also called conventional spinning or just spinning, is the forming of an axis-symmetric part over a rotating mandrel Force is delivered by a tool with a rounded end or a roller A flat, or possibly preformed, work piece is held between a mandrel and tail stock As the apparatus rotates, the tool applies localized pressure to the work while it gradually moves up the mandrel This causes the sheet metal work to be wrapped over the mandrel, thus taking its shape Metal spinning is commonly performed cold, but in some cases parts may be subject to warm or hot spinning 02-04-2018 11:26 10

11. METAL SPINNING 02-04-2018 11:26 11

12. THANK YOU!!! 02-04-2018 11:26 12