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三、胶垫厚度的计算及选用1.计算公式胶垫厚度d:?(3)锤性系数C:?(4)计算动压应力σ_d:?(5)把式(5)中C值代入(3)式得?(6)式中 A_(zl)——砧座下压振幅,m G_0——落下部分重量,即活塞、锤杆和锤头的总重,NG_1——砧座重量,NA_1——砧座底面积,m~2v——锤击速度,m/s?,T_0为说明书最大打击能量ψ——冲击回弹影响系数,?,ε为回弹系数,考虑到有限质量比在撞击中第一阶段不产生回弹,即ε=0(在压缩位移后的回弹,对砧垫不产生附加冲量),一般自由锻或模锻都取砷ψ=0.32sm~(1/2).
Third, the calculation and selection of pad thickness 1. Calculation formula Pad thickness d:? (3) Hammer coefficient C:? (4) Calculate the dynamic stress σ_d:? (5) (6) Where A_ (zl) - anvil pressure amplitude, m G_0 - the weight of the falling part, that is, the total weight of the piston, hammer and hammer, NG_1 - the weight of the anvil, NA_1 - anvil bottom area, m ~ 2v - hammer speed, m / s ?, T_0 is the specification of the maximum striking energy ψ - Impact resilience coefficient ,?, ε is the rebound coefficient, taking into account the finite mass ratio In the first stage of impact, there is no rebound, that is ε = 0 (rebound after compression displacement, no additional impulse to the anvil cushion). Generally, arsenic ψ = 0.32sm ~ (1 / 2).