采用冷、热压烧结技术分别制备了WC-8Co和Al2O3-TiC两种拉拔模具. 研究了该两种不同拉拔模具用于实际拉拔加工45#钢线时的摩擦磨损行为, 并对其磨损机理进行了分析. 结果表明: 两种拉拔模具均具有较好的强度和硬度, 能较好地进行拉拔加工, 其内孔磨损在工作区及定径区最为严重, 磨损面有金属脱落元素、模具颗粒脱落元素及润滑脂残留物. WC-8Co和Al2O3-TiC两种拉拔模具的磨损机理不尽相同, WC-8Co模具主要为粘着磨损和磨粒磨损, 而Al2O3-TiC模具则以磨粒磨损和表面疲劳磨损为主. Al2O3-TiC拉拔模具更适合于45#钢线材的拉拨.
Two types of conical dies, WC-8Co and Al2O3-TiC, were fabricated by way of cold and hot press sintering method, respectively. The wear and tear behaviors were investigated when the die samples were applied on the real 45 steel wire drawing process. After that, the friction mechanisms under the experimental phenomena were carefully studied. It is found that both of there two types of conical dies showed reasonable hardness and strength, indicating acceptable drawing ability. Further study reveals that the deformation zone and the invariable zone are the most worn area of the inner bore surface. Metal shedding, fallen-off granules from dies and leftover of lubrication grease are observed on the surface. Two different wear mechanisms for WC-8Co (adhesive and abrasive wear) and Al2O3-TiC (adhesive and abrasive wear) are then concluded. By comparison, conical die made from Al2O3-TiC is more suitable for 45 steel wire drawing process.
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