EFFECT OF FIBER AND HIGH PRESSURE TO CAST IRON BONDED DIAMOND GRINDING STONE

纤维和高压对铸铁金刚石磨石的影响

• 批准号: 06650766
• 负责人: KUNIEDA Yoshihiko
• 金额: $ 1.09万
• 依托单位: SUZUKA NATIONAL COLLEGE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650766/
• 关键词: hot isostatic pressing (HIP); capsule-free HIP; cast iron fiber; diamond grinding stone; silicon nitride; grinding ratio; 鋳鉄; ファイバー

The bonded materials in the diamond grinding stone to be the most useful working tool to grind the hard and brittle materials like ceramics have an important role and making clear their characters is one of the important subjects. It is expected that the grinding performance of the diamond grinding stone consisted of the cast iron instead of the tranditional metals is improved and that the cast iron fiber prevents the diamond particles from dropping out from the bonded material with the network effect. Then, in this report, we discussed about the sintering behaviors in vaccum and in CFHIP (Capsule-Free Hot Isostatic Press) of argon gas for the cast iron fiber bonded diamond grinding stone and about the relation between their grinding abilities for silicon nitride. The results obtained are as follows. The relative densities of the diamond grinding stones and the compacts of the bonded materials alone were increased with increasing the added amount of copper powder. The hardness of the bonded materials alone compacts sintered in CFHIP was larger than those sintered in vaccum. In case of the cast iron fiber bonded diamond grinding stone, in this experiments, the wear rate, the grinding rate and the grinding ratio were depend on the hardness. The wear rate decreased with increasing their hardness near up to HRB 87, the hardness of the base cast iron, and increased in the harder region from this point. The grinding rate became larger near up to the hardness of the base cast iron and decreased from it. The grinding ratio became larger with increase of the hardness and it took the peak near at the hardness of the base cast iron, then it decreased.

金刚石磨石中的结合剂材料作为磨削陶瓷等硬脆材料最有用的工具，具有重要的作用，弄清其性质是其中的重要课题之一。用铸铁代替传统金属制成的金刚石磨石的磨削性能有望得到改善，铸铁纤维以网络效应防止金刚石颗粒从结合剂中脱落。然后，在本报告中，我们讨论了铸铁纤维结合剂金刚石磨石在真空和无胶囊热等静压机中的烧结行为以及它们对氮化硅的磨削能力之间的关系。取得的结果如下。随着铜粉加入量的增加，金刚石磨石的相对密度和结合剂的压坯密度均增加。CFHIP烧结体的硬度高于真空烧结体。以铸铁纤维结合剂金刚石磨石为例，在本实验中，磨损率、磨损率和磨削比取决于硬度。磨损率随着硬度的增加而降低，接近HRB 87的硬度时，磨损率下降，而在硬度较高的区域，磨损率增加。磨削速度在接近母材硬度时变大，之后逐渐降低。磨削比随硬度的增加而增大，在接近母材硬度处出现峰值，然后下降。