滾柱直線導(dǎo)軌副靜剛度測(cè)評(píng)研究
本文關(guān)鍵詞: 滾柱直線導(dǎo)軌副 靜剛度 預(yù)緊力 群部變形 測(cè)評(píng)體系 出處:《南京理工大學(xué)》2017年碩士論文 論文類(lèi)型:學(xué)位論文
【摘要】:滾動(dòng)直線導(dǎo)軌副作為高精度的滾動(dòng)功能部件,具有定位精度高、磨損小、承載能力強(qiáng)等特點(diǎn),已被廣泛用于數(shù)控機(jī)床行業(yè)。本論文重點(diǎn)研究了滾柱直線導(dǎo)軌副的靜剛度性能以及靜剛度的影響因素,同時(shí)建立了不同廠家導(dǎo)軌副的測(cè)評(píng)體系;诤掌澖佑|理論,推導(dǎo)出導(dǎo)軌副受不同載荷下滾柱的受力變形情況,建立了滾柱直線導(dǎo)軌副受垂直載荷、偏擺載荷和旋轉(zhuǎn)載荷時(shí)的靜剛度模型,并對(duì)導(dǎo)軌副進(jìn)行了有限元分析。簡(jiǎn)單闡述了滾動(dòng)直線導(dǎo)軌副靜剛度試驗(yàn)臺(tái)的結(jié)構(gòu)和測(cè)控系統(tǒng),分析了導(dǎo)軌副靜剛度測(cè)量工裝優(yōu)化過(guò)程中工裝的優(yōu)缺點(diǎn);對(duì)拉壓一體工裝夾具進(jìn)行了有限元仿真;介紹了垂直靜剛度的測(cè)量方法和數(shù)據(jù)處理方法。各向載荷下,通過(guò)對(duì)上下兩排滾柱的變形及受力分析,從理論上說(shuō)明了有預(yù)緊力作用下,滾柱直線導(dǎo)軌副的靜剛度大小是無(wú)預(yù)緊力下的兩倍左右。闡述了導(dǎo)軌副預(yù)緊力計(jì)算方法,可以通過(guò)試驗(yàn)所得靜剛度曲線的轉(zhuǎn)折點(diǎn)求預(yù)緊力。研究了滑塊變形對(duì)滾柱直線導(dǎo)軌副靜剛度的影響,介紹了滑塊在預(yù)緊作用下和垂直加載作用下的滑塊群部變形測(cè)量方法,從測(cè)量數(shù)據(jù)可以看出,滑塊的群部擴(kuò)張主要發(fā)生在滑塊底部,滑塊上的外加垂直載荷越大,群部變形量也就越大。試驗(yàn)發(fā)現(xiàn),考慮滑塊的群部變形所得的靜剛度大小與實(shí)驗(yàn)數(shù)據(jù)更接近。闡述了測(cè)評(píng)樣件的制備標(biāo)準(zhǔn)、傳感器的標(biāo)定過(guò)程以及測(cè)評(píng)樣件的前處理過(guò)程,闡述了滾柱直線導(dǎo)軌副摩擦力測(cè)量方法。通過(guò)四次測(cè)評(píng)過(guò)程中發(fā)現(xiàn)的問(wèn)題,對(duì)測(cè)評(píng)方法進(jìn)行改進(jìn),最終對(duì)測(cè)評(píng)樣件進(jìn)行了系統(tǒng)的分析,總結(jié)了導(dǎo)軌副靜剛度的測(cè)評(píng)體系。
[Abstract]:As a high precision rolling function component, the rolling linear guide rail pair has the characteristics of high positioning accuracy, small wear, strong bearing capacity, etc. It has been widely used in NC machine tool industry. In this paper, the static stiffness performance of roller linear guideway pair and the influence factors of static stiffness are studied, and the evaluation system of guide rail pair from different manufacturers is established. Based on Hertz contact theory, The deformation of roller under different loads is deduced, and the static stiffness model of roller guide pair under vertical load, deflection load and rotation load is established. The structure and measurement and control system of the static stiffness test rig for rolling linear guide rail pair are briefly described, and the advantages and disadvantages of the static stiffness measuring tool of guide rail pair in the process of optimization are analyzed. The finite element simulation of tension and compression fixture is carried out, and the measuring method and data processing method of vertical static stiffness are introduced. Under each direction load, the deformation and force of the upper and lower two rows of roller columns are analyzed. It is theoretically explained that the static stiffness of the roller linear guideway pair is about twice as large as that without the pretightening force, and the calculation method of the pretightening force of the guide rail pair is expounded. The influence of slider deformation on the static stiffness of roller linear guideway pair is studied, and the deformation measurement method of slider group under pretightening and vertical loading is introduced. It can be seen from the measured data that the group expansion of the slider mainly occurs at the bottom of the slider, and the larger the external vertical load on the slider, the greater the deformation of the group. The static stiffness obtained by considering the group deformation of the slider is closer to the experimental data. The preparation standard of the test sample, the calibration process of the sensor and the pre-processing process of the test sample are described. This paper expounds the measuring method of friction force of roller linear guideway pair. Through the problems found in the course of four times evaluation, the evaluation method is improved. Finally, the system of measuring static stiffness of guide rail pair is summarized.
【學(xué)位授予單位】:南京理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:TG659
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