Press Tools Class Press Tools Class Press Tools Class
- 1. TOPIC : 6 PRESSES AND PRESS TOOLS -- M.M.Dave
- 2. Topics • Introduction • Classification • Fly Press • Hydraulic Press with advantages • Components of Press tool Assembly • Driving Mechanisms • Tonnage capacity, Shut height, Clearance • Press Working Operations • Compound die and Progressive die • Bending-bend radii, Bend allowance, Spring back • Blanking and Punching , Bending and Forming
- 4. Classification : 1, MANUAL 2, POWER PRESS ACCORDING TO, A, DRIVING MECHANISM - Cam, Toggle, Screw, Rack and pinion, Hydraulic, Pneumatic, NC
- 5. B, NUMBER OF RAM : C, OPERATION: -Blanking press, Punching press, Coning press, Extrusion press D, CONSTRUCTION: -Pillar frame, Inclined frame, Gap frame
- 7. Fly Press :
- 8. FLY PRESS: - Frame made from C.I. - Square Thread operating system - CI Balls are mounted on the cross bar. - Punch spigot fits in hole of ram. -Low Cost - No power supply required.
- 10. Advantages of Hydraulic Press : - Easy to operate. - Adjustable tonnage capacity. - Constant pressure maintained. - More power full. - Stroke can varied to any length. - Safe operation.
- 12. BLANKING Blanking is a cutting process in which a piece of sheet metal is removed from a larger piece of stock by applying a great enough shearing force.
- 13. PERFORATING NOTCHING Punching a close arrangement of a large number of holes in a single operation. Punching the edge of a sheet, forming a notch in the shape of a portion of the punch.
- 14. NIBBLING BENDING Punching a series of small overlapping slits or holes along a path to cut out a larger contoured shape. This eliminates the need for a custom punch and die but will require secondary operations to improve the accuracy and finish of the feature.
- 15. Punching / Piercing Slotting The typical punching operation, in which a cylindrical punch pierces a hole into the sheet. A punching operation that forms rectangular holes in the sheet.
- 16. LANCING Creating a partial cut in the sheet, so that no material is removed. The material is left attached to be bent and form a shape, such as a tab, vent, or louver.
- 19. PRESS COMPONENTS BOLSTER PLATE ( C.I. / C.S. ) A plate that is designed to hold in place the lower die. The bolster plate is attached to the top surface of the press bed.
- 20. Punch Tool ( High Carbon steel, Cr ) The tool typically attached to the upper portion of the die set that shapes or penetrates the sheet metal. Material is designed for excellent wear resistance, toughness, and strength.
- 21. Die Block The main tool typically attached to the lower portion of the die set. The die contains a recess that provides space for the shaping or shearing of sheet metal.
- 22. RAM - It is a Mechanical heavy duty hammer to create the load. -Attached with driving mechanism. - It can hold the tools.
- 23. Die Set / Die Shoe
- 25. SHUT HEIGHT
- 26. CLEARANCE
- 27. reasons for die clearance 1, To obtain properly designed profile. 2, To maintain efficiency 3, To reduce wear. 4, Prevent wastage. 5, Good surface finish. 6, To obtain continuity. 7, Regulate power consumption.
- 28. Terms used in Bending process: 1)Bend Radii 2) Bending allowance 3)Spring back BA= Bending allowance A= angle of bend R= bend radius t= distance from inner side face to neutral-line T=material thickness B= length without bend C= change in length after bending
- 29. Compound Die and Progressive Die: Compound Die - A die designed to simultaneously perform more than one operation with each stroke of the press. For example, a compound die may blank and pierce in a single stroke. Progressive Die - A die containing a series of stations that perform one press operation after another in series. A progressive die gradually forms a part as it moves through the die, and the last operation separates the part.
- 31. Driving Mechanisms of press Machine: 1) Hydraulic press drive 2) Crank press drive 3) Knuckle joint press drive 4) Rack and pinion press drive 5) Screw press drive 6) Eccentric press drive
- 36. BLANKING PUNCHING - The removed part from stock material is useful and is known as blank. - The removed part from stock material is scrap. The sheet is useful part. - Clearance is applied to punch. - Clearance is applied to die. - Shape is other than circular. - Shape created by the punch is always circular. - Die Governs the size of the blank. - Punch governs the size of hole.
- 37. Bending Forming - The bend axis is straight. - The bend axis is curved. - V, U are the bend operations. - Curling is Forming operation. - The thickness of material is constant. - The thickness of material is reducing. - In this operation the less strain is created. - In this operation the more strain is created.