GANPAT UNIVERSITY DEPARTMENT OF MECHANICAL AND MECHATRONICS ENGINEERING U

CHANDRAKANT N PATEL GANPAT SHANKAR CHAWL RAI DONGRI DATTPADA
GANPAT UNIVERSITY DEPARTMENT OF MECHANICAL AND MECHATRONICS ENGINEERING U




Ganpat University

Department of Mechanical and Mechatronics Engineering

U V Patel College of Engineering

Production Technology


Experiment no: 8 Date:











AIM: Tutorials for press and Presee Tool.


  1. A blank has a perimeter of 31.75 cm. The metal is 1 mm thick cold worked 0.15%. Carbon steel with shear strength of 420 N/mm2 and percent penetration of 25%. Two holes of 1.25 cm diameter each are to be pierced during the same stroke when the piece is blanked. What are the forces required for blanking and for piercing? What is the maximum force the press must exert at any one time without shear? What energy is required per stroke?

  2. Calculate the maximum punch force necessary to blank a steel washer 44 mm outside diameter 22.25 mm inside diameter and 1.60 mm thick, if τs = 400 N/mm2. Estimate the work done if % penetration is 25%.

  3. A hole 100 mm diameter is to be punched in steel plate 5.6 mm thick. The material is cold rolled 0.4% C steel for which ultimate shear strength is 550 MPa. With normal clearance the tools, cutting is completed at 40% penetration of the punch. Give suitable diameter punch and die and a suitable shear angle for the punch in order to bring the work with capacity of a 30-tone press (100 mm, 101.1 mm, 4.2°).

  4. A hole of 60 mm diameter is to be produced in steel plate 2.5 mm thick ultimate shear strength of the plate material is 450 N/mm2. If the punching force is to be n to half of the force using a punch without shear, estimate the amount of shear on the L Take percentage penetration as 40%.

  5. A washer with a 12.7mm internal hole and an outside diameter of 25.4 mm is to made from 1.5 mm thick strip of 0.2 percent carbon steel. The ultimate shearing strength of the material of the washer is 280 N/mm2. (a) Find the total cutting force if both punches act at the same time and no shear is applied to either punch or the die. (b) What will be the cutting force if the punches are staggered, so that only one punch acts at a time, (c) Taking 60% penetration and shear on punch of 1 mm, what will be the cutting force if both punches act together

75






Tags: department of, ganpat, department, mechanical, university, engineering, mechatronics