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借助圆环镦粗实验,以Cr12MoV为模具材料,20钢为工件材料,分别在磷皂化润滑与无润滑条件下,探讨模具与工件的表面粗糙度对冷锻摩擦的影响规律,为冷锻成形中模具和工件表面粗糙度的选择提供参考。实验结果表明,冷锻摩擦因子随模具表面粗糙度的增大而增大。工件表面粗糙度对摩擦的影响在不同润滑条件下具有不同的表现,磷皂化润滑条件下,工件表面粗糙度越大,摩擦因子越小;无润滑条件下,摩擦因子随着工件表面粗糙度的增大先减小后增大。同时发现,随着变形程度的增加,试样的表面粗糙度逐渐趋近于模具的表面粗糙度。
With ring upsetting experiments, Cr12MoV as the mold material, 20 steel as the workpiece material, respectively, in the phosphorus saponification lubrication and non-lubrication conditions, to explore the mold and the workpiece surface roughness on cold forging friction rule, for cold forging In the mold and workpiece surface roughness to provide a reference. The experimental results show that the cold forging friction factor increases with the increase of the die surface roughness. The effect of workpiece surface roughness on friction has different performance under different lubrication conditions. Under the condition of phosphorus saponification lubrication, the larger the surface roughness of the workpiece, the smaller the frictional factor; under the condition of non-lubrication, the friction factor increases with the surface roughness Increasing decreases and then increases. It is also found that with the increase of the deformation, the surface roughness of the sample gradually approaches the surface roughness of the mold.