摘 要
當今，各種現代化企業均擁有眾多的數字控制設備，充分開發應用它們的功能，將對國民經濟的發展發揮巨大的作用。科技創新開發機電一體化的機電產品更是時代的迫切要求。為了適應數控技術和國民經濟發展的需要，高等工科院校應該將“數控技術”這種多學科交叉、綜合的高新技術給予重視。
學校根據我們所學課程結合現代化數控技術的發展趨勢（即高速化，高效化，高精度化），對我們的畢業設計提出有關于數控機床改進的課題，是對我們學生的專業知識的進一步的提高，以及對現代化數控技術的追求。
高速化，高精度化的數控技術對數控機床的硬件部件（即傳動部件）的剛性及定位精度等提出了更高的要求。機床的進給部件是整個輪廓描述和保證形位精度的最關鍵和最基本的部分。如果機床的進給部件不能精確地控制輪廓的描述，即使它的主軸部件再好了不能完成零件的加工。
數控機床對進給部件的要求主要體現在滾珠絲杠以及其支撐部件上。不僅要對支撐滾珠絲杠的軸承提出特殊要求，更要對安裝軸承的軸承座提出更高的要求，軸承座的定位安裝精度直接影響軸承座的定位精度，也就導致滾珠絲杠能否達到需要的安裝精度，滾珠絲杠如果不能正確安裝，必然導致軸承加劇磨損，壽命降底。
所以，軸承座精度是否達到要求也將影響機床的精度。而我們以此作為畢業設計，對軸承座作進一步分析，雖不能有所發現或發明，卻對我們個人的專業知識，和設計思維有更進一步的發展和提高。
本文正文主要分三個部分：
第一部分：根據現今數控機床的性能需求，結合現有的機床資料，開發出一種新型的或較全理的軸承座結構方案；并分析該方案的可行性，同時也要選擇幾種現有的軸承座型號，與開發出的型號進行對比，比較各軸承座之間的優點，取華之精華，最終確定軸承座的結構方案；確定該軸承座的工作環境，裝配關系等，繪制一套完整的零件裝配圖（A2以上圖幅），并繪制一套零件圖（A2圖幅）。
第二部分：對軸承座的生產工藝進行分析，確定軸承座的加工工藝過程，提交完整的機加工工藝過程卡片；提取工藝過程中最具代表性的工序即鏜孔工序，進行完整分析，選擇加工環境，計算機加工數據，填寫該工序卡片。
第三部分：設計鏜孔工藝的夾具——鏜孔夾具。根據加工環境設計一套適合大批量生產的夾具；對夾具工藝性進行分析，繪制夾具裝配圖一張（A1圖幅）；并繪制其中一部分的夾具零件圖。
關鍵詞：軸承座 結構分析 鏜孔夾具 工藝分析
Abstract
Today, modern enterprises have a large number of digital control equipment, the full development and application of their functions, development of the national economy will play a great role. The development of scientific and technological innovation of mechanical and electrical products Mechatronics is an urgent requirement of the times. In order to adapt to digital technology and the needs of national economic development, engineering colleges should be "digital technologies" such cross-multidisciplinary, comprehensive high-tech attention.
Schools are based on our professional courses NC modern CNC technology combined with the development trend (that is, high-speed, efficient, and precision) of our students graduating from NC professional design to improve on the subject of CNC machine tools is on the expertise of our students to increase further, as well as the pursuit of modern CNC technology.
High-speed, high-precision numerical control of CNC machine tool technology to the hardware components (ie, transmission parts) of the positioning accuracy, such as rigidity and a higher demand. Feed machine parts of the contour shape and position descriptions and to ensure the accuracy of the most critical and most basic part of. If the machine tool feed control components can not accurately describe the contour, even if it no matter how good the main components of the processing parts can not be completed.
CNC machine tools to feed the requirements of the major components in the ball screw and its support components. Not only for the ball screw support bearings special requirements on the installation of bearings to bearing the higher requirements of the position bearing installation bearing a direct impact on the accuracy of the positioning accuracy, it can lead to ball screw to achieve the need for the installation of precision ball screws, if not installed correctly, will inevitably lead to increased bearing wear, down at the end of life.
Therefore, whether the bearing accuracy requirements will also affect the accuracy of machine tools. And we as a graduation project, on the bearing for further analysis, though can not be found or invented, but our personal expertise, and design ideas to further develop and improve.
In this paper, the main body is divided into three parts:
The first part: According to the performance of today's CNC machine tool demand, combined with the existing tools of information, the development of a new or less the whole rationale of the bearing structure; and to analyze the feasibility of the program, but also to choose a few are some bearing models, and developed a comparative model to compare the advantages between the bearing, take the essence of China, and ultimately determine the structure of the program bearing; to determine the bearing of the working environment, the assembly and so on, drawing a complete sets of parts assembly (A2 Maps above), and the mapping of a set of parts diagram (A2 Maps).
Part II: The bearing analysis of the production process to determine the bearing of the processing process, to submit a complete machining process card; extraction process in the most representative of the processes that boring process, a full analysis of options processing environment, the computer processing of data, fill in the card process.
Part III: Design of the Jig Boring Process - jig boring. Processing environment in accordance with the design of a fixture suitable for mass production; of the fixture of the analysis process, drawing a fixture assembly (A1 Maps); and part of the fixture drawn parts diagram.
Keywords: Bearing Block; Structural Analysis; Jig Boring ; Process Analysis
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