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Ultra-High Speed Surface Grinding with cBN Wheel at a Wheel Speed of 500 m/s

使用 cBN 砂轮进行超高速平面磨削，轮速为 500 m/s

基本信息

批准号：
08555031
负责人：
SYOJI Katsuo
金额：
$ 9.09万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08555031/
关键词：
cBN wheel Ultra-high speed surface grinding High efficiency grinding High frequency wheel spindle CFRP core Grinding performance 超高速研削ビトリファイドボンドCBNホイール CFRPハブホイール高剛性・高出力スピンドル dn値2,000,000 リテ-ナ潤滑比研削抵抗

项目摘要

A high-frequency wheel spindle for an ultra-high speed surface grinding machine was developped. This project aims to achieve a high efficiency grinding of steel with cBN wheels, in which a stock removal rate is over 300 mm^3/(mm・s) at a wheel peripheral speed of 400m/s. At such a speed, the power loss caused by air and coolant friction is larger than grinding power. At first, a theoretical analysis of grinding forces was carried out to estimate the grinding power. From this analysis the wheel diameter of F250mm and motor power of 22 kW at 30000 min^<-1> were decided. Also, an eigenvalue analysis by FEM was carried out to decide the diameter of the spindle shaft that avoids the resonance caused by a heavy wheel. In the spindle unit, a newly developed lubrication reduces the no-load power and the temperature rise of bearings. Furthermore, constant pre-load mechanism was adopted to achieve a high stiffness without burning out the bearings. Finally, the advantage of a small diameter wheel … More is confirmed experimentally by measurement of air friction loss, which confirmed to calculated results using the logarithmic law.Secondly, an ultra-high speed grinding (UHSG) machine which is capable of 400m/s wheel speed was developped. UHSG is one of the high efficiency machining methods. It has reached the stage where it can complete well with respects to machining efficiency even in comparison with a cutting method. Concept of the USHG is not new, however a practical application of the UHSG was difficult due to the manufacturing problems of a grinding wheel and a wheel spindle unit in the ultra-high speed rotation. In the previous work, an ultra-high speed spindle unit (30000 rpm, 22kW,2*10^6 dn-value) was developed. In this paper, a UHSG machine using the spindle unit was designed and manufactured. Vibration, noise and coolant friction loss of the machine were measured and compared with the conventional grinding results. The UHSG tests were performed under the 300m/s wheel speed using the developed machine and a vitrified bonded cBN wheel. The cBN wheel having a CFRP core was specially designed. However, coolant supply was not enough in the region of the UHSG,therefore the development of a low friction supplying method was needed. Less

研制了一种用于超高速平面磨床的高频砂轮主轴。本项目旨在实现cBN砂轮高效磨削钢材，在砂轮圆周速度为400 m/s时，切削量超过300 mm^3/（mm·s）。在这样的转速下，由空气和冷却液摩擦引起的功率损失大于磨削功率。首先，对磨削力进行理论分析，估算磨削功率。根据该分析，确定了30000 min时的轮径为F250 mm，电机功率为22 kW<-1>。同时，通过有限元特征值分析，确定了避免重轮共振的主轴直径。在主轴单元中，新开发的润滑剂降低了空载功率和轴承的温升。此外，采用恒定预紧机构，以实现高刚度，而不会烧坏轴承。最后，小直径车轮的优点 ...更多信息通过对空气摩擦损失的测量，验证了理论计算的正确性。其次，研制了一台砂轮速度可达400 m/s的超高速磨削机床。超高速切削是一种高效的加工方法。它已经达到了这样的阶段，即使与切削方法相比，它也可以在加工效率方面完成得很好。USHG的概念不是新的，然而，由于超高速旋转中的砂轮和砂轮主轴单元的制造问题，UHSG的实际应用是困难的。在以前的工作中，开发了一种超高速主轴单元（30000 rpm，22 kW，2*10^6 dn值）。本文设计并制造了一台采用该主轴单元的超高压成形机。测量了机床的振动、噪声和冷却液摩擦损失，并与常规磨削结果进行了比较。在300 m/s的轮速下使用所开发的机器和陶瓷结合剂cBN轮进行UHSG测试。具有CFRP芯的cBN轮是专门设计的。然而，在UHSG区域内冷却剂供应不足，因此需要开发低摩擦供应方法。少