Calculation of force for shearing with rotating blades
Calculation of force for shearing with rotating blades
(OP)
Hi,
can anyone help me with defining the force that is needed for shearing of sheet steel (st.37) with 2 rotating blades? The principle can be seen on this video: https://www.youtube.com/watch?v=da99re5O0Rc.
I need to define the force for penetration (blades going down) and for rotation of the two blades (see image).
Thank you,
P
can anyone help me with defining the force that is needed for shearing of sheet steel (st.37) with 2 rotating blades? The principle can be seen on this video: https://www.youtube.com/watch?v=da99re5O0Rc.
I need to define the force for penetration (blades going down) and for rotation of the two blades (see image).
Thank you,
P





RE: Calculation of force for shearing with rotating blades
Let's say we got a 4 mm thick sheet and we want to cut out a diameter of 800mm. The rolling knife has a diameter of 110 mm.
I only need the formulae for the forces acting on the knife...please.
Thank you,
RE: Calculation of force for shearing with rotating blades
So if you transfer the formulas on this page:
http://en.wikipedia.org/wiki/Wedge_%28mechanical_d...
to the circular knife motion, that will be a good starting point.
Guess it will require a lot of force.
RE: Calculation of force for shearing with rotating blades
P
RE: Calculation of force for shearing with rotating blades
eg if the section being sheared is 20mm long, the area will be 20 x 4 = 80 sq mm. Force will be area times average shear stress across the section (somewhere between 50% and 100% of ultimate shear stress for the material).
USS = about 0.75 x UTS for steels. So a 400 MPa steel would have USS of 300 MPa and the force in the example would be
300 x 80 = 24,000 N per wheel. This is the normal force - the vertical (press force) and horizontal (spindle torque) force components will depend on the angle of the Normal force vector (a line through the shering section and the axis of the cutting wheel)
je suis charlie
RE: Calculation of force for shearing with rotating blades
Ted
RE: Calculation of force for shearing with rotating blades
RE: Calculation of force for shearing with rotating blades
RE: Calculation of force for shearing with rotating blades
RE: Calculation of force for shearing with rotating blades
RE: Calculation of force for shearing with rotating blades
je suis charlie
RE: Calculation of force for shearing with rotating blades