STABILIZATION OF DRESSING PERFORMANCE OF ROTARY DIAMOND DRESSER BY MEANS OF ON-THE-MACHINE PROFILE CONDITIONING

通过在机轮廓调节稳定旋转式金刚石修整器的修整性能

• 批准号: 15560090
• 负责人: TAMAKI Junichi
• 金额: $ 2.11万
• 依托单位: KITAMI INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560090/
• 关键词: ROTARY DIAMOND DRESSER; METAL-BONDED DRESSER; INTERNAL GRINDING; SMALL CBN GRINDING WHEEL; FREQUENCY ANALYSIS; GRINDING FORCE; GROUND SURFACE ROUGHNESS; GRINDING WHEEL RADIAL WEAR; ロータリドレッサ; 砥石作業面; ホイール半径摩耗; 研削仕上げ面粗さ; 低速回転高剛性ドレッサ; 機上形状修正; 接触

As a means to realize on-the-machine truing of rotary dresser for internal grinding machine, a dressing system in which the rotating speed of the dresser is very slow compared to that of the grinding wheel, is adopted, a journal bearing is used for the spindle in order to achieve a high stiffness of 40 N/μm. The contact point of dresser to the grinding wheel is detected by an AE sensor with an accuracy of 0.1μm. Dressing performance of two types of V-shaped rotary diamond dressers, a single-layered impregnated diamond dresser and a metal-bonded diamond dresser, are investigated. Internal plunge grinding of hardened steel was conducted and the effects of dresser type on the grinding performance were investigated. The following results are summarized.1)When a rotary dresser rotating with a very slow speed is applied to the grinding wheel with a small diameter, a part of grinding wheel surface in the widthwise direction may not contact the rotary dresser. This unevenness of dressing can be reduced by the use of a dresser on which the diamond grains are aligned with short intervals.2)The metal-bonded diamond dresser has the advantage that the intervals of diamond grains can be easily controlled, therefore, being available for the dresser of the grinding wheel with a small diameter.3)The metal-bonded diamond dresser can be trued with high profile accuracy by means of vitrified GC cup-wheel method.4)The metal-bonded diamond dresser brings about a grinding force more stable than that of the impregnated diamond dresser.5)The metal-bonded diamond dresser with small grain size increases the grinding force, decreases the finished surface roughness, and decreases the radial wheel wear. The optimum grain size of the dresser is around #270 for the grinding wheel of #140 mesh size.

作为实现内圆磨床旋转修整器在机修整的手段，采用修整器转速比砂轮慢的修整系统，主轴采用轴颈轴承，以实现40 N/μm的高刚度。修整器与砂轮的接触点由AE传感器检测，精度为0.1μm。研究了单层孕镶金刚石修整器和金属结合剂金刚石修整器两种V型旋转金刚石修整器的修整性能。对淬硬钢进行内切入磨削，并研究修整器类型对磨削性能的影响。总结如下结果： 1)当以非常慢的速度旋转的旋转修整器应用于小直径砂轮时，砂轮表面在宽度方向上的一部分可能不接触旋转修整器。通过使用金刚石颗粒以短间隔排列的修整器，可以减少修整的不均匀性。2）金属结合剂金刚石修整器的优点是金刚石颗粒的间距易于控制，因此可用于小直径砂轮的修整器。3）金属结合剂金刚石修整器可以通过陶瓷GC杯形砂轮进行高轮廓精度的修整。 4）金属结合剂金刚石修整器磨削力比孕镶金刚石修整器更稳定。5）小粒度金属结合剂金刚石修整器增加了磨削力，降低了成品表面粗糙度，减少了径向砂轮磨损。对于#140目尺寸的砂轮，修整器的最佳粒度为#270左右。