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致密金属在理想轧制条件下.摩擦系数可由下式确定:μ=α/2[1-(4S_nh/Δh)~(1/2) ]~(-1) ,α是临界咬入角,S_n 是由实验测定的前滑值。Δh 为轧制压下量。本文根据有孔金属变形质量不变的原理,对上式进行修正,得到计算摩擦系数的新公式:μ=α/2[1-(4(S_n+1-K)h/KΔh)~(1/2) ]~(-1) ,K 是考虑:致密化的修正系数,它等于有孔金属轧制时,对应中性角的板坯密度与轧制带材的最终密度之比。该式也适用于致密金属轧制(K=1) ,因而是一个普遍公式。实验测定铜粉烧结坯冷轧的前滑值是随轧制板坯的原始密度增大而增大;按上式计算的摩擦系数则随轧带的密度增大而减小。
The compact metal is under ideal rolling conditions and the coefficient of friction can be determined as follows: μ = α / 2 [1- (4S_nh / Δh) ~ (1/2)] -1, α is the critical bite angle, S_n Is determined by the experiment before the sliding value. Δh is the rolling reduction. According to the principle of invariable mass deformation of porous metal, the above formula is modified to obtain a new formula for calculating the friction coefficient: μ = α / 2 [1- (4 (S_n + 1 -K) h / KΔh) / 2)] ~ (-1), K is the correction factor of densification which is equal to the ratio of the slab density corresponding to the neutral angle to the final density of the rolled strip when the metal is rolled. This formula also applies to dense metal rolling (K = 1) and is therefore a general formula. The experimental results show that the front slip value of cold rolled copper powder increases with the increase of the original density of the rolled slab. The friction coefficient calculated according to the above formula decreases with the increase of the density of the rolled strip.