Study on a Ultra-precisely Joining Method using a Shrink Fitter

热缩钳超精密连接方法的研究

• 批准号: 08650168
• 负责人: NITTA Isami
• 金额: $ 1.41万
• 依托单位: Niigata University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 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-08650168/
• 关键词: Machine Element; Fixing Element; Shrink Fitter; Out-of-Roundness; Polygon Mirror; Self-Acting Air bearing; Ultra Precision

A shrink fitter was used to join an aluminum polygon mirror and a SiC self-acting air bearing ultra-precisely. It is inevitable that mirror surfaces of the polygon mirror will de wearped by heat gensrated from a motor if conventional joining methods, such as set screws and springs, are taken. The shrink fitter can resolve the deformation problem of the mirror surfaces caused by the temperature rise. The shrinkage fit gives better shaft location than the other joining methods.Last year we designed dimensions of the shrink fitter by a numerical analysis, in which the mirror surfaces could not be warped over 100nm by the heat generated from the motor. Then the experiment were carried out to check the design of the shrink fitter.After joining by the shrink fitter, the mirror surfaces of the polygon mirror have to be cut by a ultra-precision lathe to a desirable flatness of 100nm. This is called secondary cut. This year, to omit the secondary cut, we have searched optimum shapes of the poly … More gon mirror through computer simulation. Usually the mirror surfaces of the polygon mirror in rotation are deformed outwaed to some 300nm by a centrifugal force. However it is thought that special shapes of the polygon mirror can keep this deformation below some 100nm. So we checked some 30 or 40 shapes through the computer simulation and finally found out 2 or 3 optimum shapes which could keep the deformation below tolerable amount (submitted to JSME). Furthermore the effect out-of-roundness ofothe fitting surfaces on the deformation of the mirror surfaces was investigated. Six sets of specimens were prepared and the out-of-roundness of each specimen was measured. The shapes of the mirror surfaces sfter the shrink fit were calculated based on the measured out-of-roundess. In the experiment, the mirror surfaces were measured by the laser interferometer, ZYGO.The calculated values were in good agreement with the measured ones. Thus we could clarify the effect of the out-of-roundness (to be published from JSME). However it was also clear that the secondary cut could not be omitted if the out-of-roundness was 0. Less

使用收缩装配将铝多边形镜和碳化硅自动作用空气轴承超精密地连接在一起。如果采用固定螺丝和弹簧等传统连接方法，多面镜的镜面不可避免地会被电机产生的热量磨损。本实用新型可以解决因温度升高而引起的镜面变形问题。收缩配合提供了比其他连接方法更好的轴位置。去年，我们通过数值分析设计了收缩配合的尺寸，其中镜面不能因电机产生的热量而翘曲超过100 nm。在此基础上进行了实验，验证了收缩配合的设计，通过收缩配合后，需要用超精密车床将多面镜的镜面切割成100 nm的平面度。这称为二次切割。今年，为了省去二次切割，我们寻找了聚…的最佳形状通过计算机模拟得到更多的棱镜。通常情况下，旋转的多边形镜的镜面在离心力的作用下向外变形到约300 nm。然而，人们认为，多边形镜的特殊形状可以将这种变形保持在大约100 nm以下。因此，我们通过计算机模拟检查了大约30或40个形状，最终找到了2到3个最佳形状，可以将变形量保持在可容忍的范围内(提交给JSME)。此外，还研究了配合面不圆度对镜面变形的影响。制备了6组试件，测量了每组试件的不圆度。根据测量的不圆度计算了热配合后镜面的形状。在实验中，用激光干涉仪ZYGO对镜面进行了测量，计算值与实测值吻合较好。因此，我们可以澄清不圆度的影响(将由JSME发布)。然而，很明显，如果不圆度为0，则不能省略二次切割。较少