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DEVELOPMENT OF POROUS RESIN BOND WHEEL FOR PRESSURE-CONTROLLED GRINDING ON DIE MATERIALS

模具材料控压磨削用多孔树脂结合剂砂轮的研制

基本信息

批准号：
05650131
负责人：
SENBA Takuya
金额：
$ 1.54万
依托单位：
FUKUOKA INSTITUTE 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：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

This research deals with the development of a porous melamine bond wheel wihch is suitable for pressure-controlled grinding on die materials. Carbon dioxide, which is generated by the chemical reaction between sodium acid carbonate (SAP) and sodium acid pyrophosphate (SAP), was applied to generate an open cellular structure by mixing the above forming chemicals within the resin. Performance of wheels which show various formed structures was examined through the measurement of grinding force, removal rate and wheel wear rate under the process of surface grinding on the sintered tungsten carbide. It became clear that the pore size and pore structure could be controlled by varying the composition of the chemicals used and composition ratio of SAP in the chemical mixture. Also, it was confirmed that self-dressing of the wheel was activated proportionally as the pore structure changed from a closed cell to an open one and pore size became large.However, the self-dressing was not continuously generated even if the volume percentage of the melamine bond was decreased within the limit in which uniform pore structure could be generated. Accordingly, grinding fluid which contains WA grains was employed to activate the self-dressing of the wheel. The effect of WA grains was verified through the measurement of removal and and wheel wear rate by varying the grain size and a density of grains in the fluid. It became clear that the removal rate was dramatically increased in case that a grain size of the WA grain was selected as small compared with the diamond grains that were included in the wheel. Also, it was acknowledged that the wheel wear rate was increased in accordance with the grain size and the WA grain density in the fluid were increased as the truing of the wheel was activated.

本文研究了一种适用于模具材料压控磨削的多孔三聚氰胺结合剂砂轮的研制。二氧化碳是由碳酸钠（SAP）和焦磷酸钠（SAP）之间的化学反应产生的，通过在树脂中混合上述形成化学物质来产生开放的细胞结构。通过对烧结硬质合金表面磨削过程中砂轮的磨削力、磨削去除率和砂轮磨损率的测定，考察了砂轮的磨削性能。很明显，孔隙大小和孔隙结构可以通过改变所用化学品的组成和化学混合物中SAP的组成比例来控制。同时，证实了随着孔结构由封闭孔变为开放孔，孔径变大，砂轮的自修整成比例地激活。然而，即使在能产生均匀孔隙结构的限度内降低三聚氰胺键的体积百分比，也不能连续地产生自修整。因此，采用含WA颗粒的磨削液来激活砂轮的自修整。通过改变流体中晶粒尺寸和晶粒密度来测量去除率和车轮磨损率，验证了WA晶粒的作用。很明显，如果选择WA晶粒的晶粒尺寸与砂轮中包含的金刚石晶粒相比较小，则去除率显着提高。结果表明，砂轮磨损率随晶粒尺寸的增大而增大，随着砂轮打磨的启动，流体中WA晶粒密度增大。