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Ultra Precision Cutting of Steel by Oxide-Titanium Reinforced Sapphire Cutting Tool

氧化物钛强化蓝宝石刀具对钢的超精密切削

基本信息

批准号：
09650144
负责人：
UEGAMI Kenjiro
金额：
$ 1.79万
依托单位：
OSAKA CITY UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650144/
关键词：
ULTRA PECISION CUTTING ALUMINUM OXIDE WHITE SAPPHIRE SAPPHIRE CUTTING TOOL CRYSTAL ORIENTATION TITANIUM OXIDE SOLID SOLUTION HARDNESS 異相分散硬化

项目摘要

On the ultra precision machining, the work materials are only copper, aluminum and their alloys except ferrous material, and the single diamond cutting tools lapped by the fine technology are employed. The steels are not able to be cut by the single diamond cutting tool, because the tool wear progressed rapidly by the diffusion of diamond carbon into work steel. Then, white sapphire (single crystal of aluminum oxide) cutting tools are made trial as the ultra precision cutting tool. But the hardness of white sapphire is about 2000HV, one quarter value of diamond hardness. The solid solution hardening is applied to the qualitative improvement of white sapphire, and alumina ceramics materials produced by sintering the powder mixed aluminum oxide and titanium oxide. These reinforced sapphires and alumina ceramics are experimented for the frictional wear and impact resistance. Both kinds of test materials are formed into a cone shape. On the frictional tests, the top of the test pesce cones are pressed on rotating cylindrical steel S55C. On the impact resistance tests, the steel S55C plate is scratched by the top of test peace cones. Titanium oxide is occluded in alumina materials by thermal diffusing addition method of which alumina sample is put into the titanium oxide powder and is heated in electric furnace. On the frictional wear tests and impact scratched tests, the sapphire and ceramics added titanium oxide increased the resistance for the wear and the breaking off of top of cone.

在超精密加工中，工件材料仅为铜、铝及其合金，而非黑色金属材料，并采用精密研磨的单金刚石刀具。钢不能被单一的金刚石刀具切削，因为刀具磨损通过金刚石碳扩散到工作钢中而迅速进行。然后，尝试使用白色蓝宝石（氧化铝单晶）刀具作为超精密刀具。但白色蓝宝石的硬度约为2000 HV，是金刚石硬度的四分之一。将固溶硬化应用于白色蓝宝石的质的改善，将氧化铝和氧化钛混合粉末烧结制成氧化铝陶瓷材料。对这些增强的刚玉和氧化铝陶瓷进行了摩擦磨损和抗冲击性能试验。两种试验材料均形成锥形。在摩擦试验中，试验容器锥的顶部压在旋转的圆柱形钢S55C上。在抗冲击试验中，S55C钢板被试验锥的顶部划伤。采用热扩散添加法，将氧化铝样品加入到氧化钛粉末中，在电炉中加热，将氧化钛包藏在氧化铝材料中。在摩擦磨损试验和冲击划痕试验中，添加氧化钛的蓝宝石和陶瓷提高了锥顶的耐磨性和抗折断能力。