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œCalculation of required machining force  required machining force F is determined based on the content of machining 1.Shearing (cam piercing, cam trimming) @1.) Shearing angle on cutting tool (cam piercing, cam trimming) @@@Machining force F R~ t ~ ƒÑ ~ 103 @2.) No shear angle on cutting tool @@@Machining force F R~ t ~ ƒÑ ~ k ~ 103 2. Flanging (cam flange) @@Machining force F ~R~ t ~ ƒÐB@@@or@@P ~R~ t ~ ƒÐB (when bend is small) 3. Re striking (cam re striking) @@Machining force F ~R~ t ~ ƒÐB@@@or@@P ~R~ t ~ ƒÐB (when bend is small) @@If enough re striking is necessary, machining force more than specified above is necessary. 6 1 3 1 3 2 6 5 F R t ƒÑ ƒÐB k F Machining force (kN) {tonf} F Punching profile(for around punchR=ƒÎd) (mm) F Panel thickness (mm) F Shearing resistance (N/mm2) {kgf/mm2} F Tensile strength (N/mm2) {kgf/mm2} F Co efficient of shear (0.2`0.6) Refer to the relationship of panel thickness/hole diameter on page 81. œCalculation of cam contact pressure  V and Q are calculated based on the machining force F, ƒÆ1 and ƒÆ2. V and Q, then, are divided by each contact area and the pressure is calculated. Design so that pressure calculated falls under allowable pressure of each sliding material. By selecting materials with high allowable wear amount, the unit can be made smaller. ƒÆ1 F Inclined angle of driver, ƒÆ2 F Inclined angle of cam, P F press force, V F load applied onto the bottom surface of cam slide, Q F load applied onto the surface of cam slide, L F press stroke, S F machining stroke, S1 F slide stroke, F F necessary machining force (machining force + return spring force + cam pad force + slide weight) 3. Aerial Cam 2. Inclined angle Cam 1. Horizontal Cam Cam Diagram Cam Diagram Cam Diagram 66 