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纳米复合金属陶瓷材料不仅具有较好的综合机械性能,如高强度、高硬度、耐高温、耐磨损,而且具有较好的化学稳定性、抗氧化性能和耐腐蚀性能,在模具制造方面具有广阔前景.本文综述了纳米复合金属陶瓷材料的研究现状及存在问题,并指出了今后研究的发展趋势. 相似文献
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Rare earth ceramic cutting tool and its cutting behavior when machining hardened steel and cast iron
The addition of rare earth element yttrium played an important role in the improvement of both mechanical properties and wear resistance of Al2O3/(W,Ti)C ceramic cutting tool material.Mechanical properties especially the fracture toughness and flexural strength were obviously increased when a suitable amount of the yttrium were added.Wear resistance of the developed rare earth ceramic cutting tool material was higher than that of the corresponding materials without rare earth in the machining of the hardened 45# carbon steel and cast iron HT20-40.Wear modes of the Al2O3/(W,Ti)C rare earth ceramic tool materials were mainly flank wear and crater wear accompanied with slight notch wear when machining the hardened carbon steel.Wear mechanisms were major abrasive wear at low cutting speed and adhesive wear at high cutting speed.Wear modes were nearly the same except that the adhesion phenomenon in the crater area was intensified when machining cast iron.The flank wear area was relatively smooth with no obvious plowing phenomenon which was possibly concerned with the workpiece of low hardness and the adhesion phenomenon at high cutting temperature. 相似文献
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纵向移动手输部位的改动CX616A车床溜板箱纵向移动手轮1上的手柄,由于其自身的重量对手轮产生一个不平衡的力,使溜板箱纵向移动不稳,车螺纹易扎刀,螺距误差也大;为避免这一现象,操作者在车螺纹时常卸去手柄,但又带来手动的不便。为此我们对该手轮部位进行了... 相似文献
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