偏心是對工件表面光潔度、加工尺寸精度和刀具壽命等產生不利影響的幾個關鍵因素之一。偏心的定義為偏離中心軌跡,在切削過程中的偏心定義為主軸、刀柄和刀具的旋轉軸不是其中心線,而是中心線的平行線,偏心是由主軸、刀柄、刀具的裝夾偏差和幾何外形缺陷引起的。偏心誤差由兩個幾何參數(shù)偏移幅度矢量e_c和角位置矢量λ_c組成。在切削參數(shù)較大時,較小的偏移值引起的后果可能不顯著,而在切削參數(shù)較小時,它可能會導致切屑量、銑削力等的周期性偏差。其他研究只顯示了偏心對切削力等因素的許多不利影響,而本研究目標在于減少銑刀刀刃上的最終偏心誤差,并揭示不同的主軸、刀柄、刀具的安裝方位影響其外形輪廓和中心軸線的方式。這一問題的解決非常重要,因為偏心率與切削力成正比,過大的切削力會導致整個加工系統(tǒng)的變形,并產生意外的缺陷部件,因此開展了旨在不消除但減少這一誤差的研究工作。本論文的主要研究工作為:（1）在CNC立式銑削加工中心上進行了大量測量實驗。采用在軸向分層的方法,使用Swiss SYLVAC千分表測量了主軸、刀柄、刀具的各種裝夾方位組合下每層的幾何缺陷,分析得到各層的幾何偏差,再... 

【文章來源】：廣東海洋大學廣東省

【文章頁數(shù)】：204 頁

【學位級別】：碩士

【文章目錄】：
ACKNOWLEDGEMENT
Abstract
摘要
1 Introduction
    1.1 Problem Statement
    1.2 AIMS,OBJECTIVES AND FINDINGS
    1.3 ECCENTRICITY
        1.3.1 Factors that affects the eccentricity:
        1.3.2 Types of clamping methods based on run-out
    1.4 WORKING DIAGRAM OF COMBINATION(SPINDLE,TOOL HOLDER AND MILLING CUTTER)
    1.5 CAUSES,MINIMIZATION METHODS AND ROLE OF ECCENTRICITY ON PRECARIOUS PARAMETERS
        1.5.1 Causes of tool run-out
        1.5.2 How the tool run-out can be minimized
        1.5.3 Instruments used for measuring the cutter eccentricity/run-out
        1.5.4 Role of cutter eccentricity on cutting forces
        1.5.5 Role of cutter eccentricity on surface finish/roughness/topography
    1.6 CUTTING FORCES
        1.6.1 Factors that affects the cutting forces
        1.6.2 Instruments used for measuring the cutting forces
        1.6.3 Role of cutting parameters on cutting forces
        1.6.4 Cutting forces as the function chip thickness
        1.6.5 Cutting force models
        1.6.6 Cutting forces with tool wear
    1.7 SURFACE ROUGHNESS
    1.8 LITERATURE REVIEW
    1.9 MATERIALS AND METHODS
    1.10 CHAPTER PLAN OF THE THESIS
2 Experimental Setup and Procedure for the measurement of Eccentricity at different orientations from the spindle,tool holder and cutters
    2.1 TASKS FOR EXPERIMENTS
    2.2 MACHINING ELEMENTS COMBINATION MODEL EXHIBITING ECCENTRICITY
    2.3 EXPERIMENTAL SETUP
    2.4 EXPERIMENTAL PROCEDURE
        2.4.1 Spindle
        2.4.2 Tool holder at 0~0
        2.4.3 Tool holder at 180~0
        2.4.4 Measurement procedure of milling cutters(Tool#1-Tool#6)
    2.5 SUMMARY
3 Experimental Analysis of Eccentric data
    3.1 ANALYSIS OF SPINDLE RECORDED DATA
    3.2 ANALYSIS OF TOOL HOLDER RECORDED DATA AT00 ORIENTATION
    3.3 TOOL#1
    3.4 ANALYSIS OF TOOL HOLDER AT1800 ORIENTATION
    3.5 TOOL#2
    3.6 TOOL#3
    3.7 TOOL#4
    3.8 TOOL#5
    3.9 TOOL#6
    3.10 SUMMARY
4 Measurement setup and measurement method of cutting forces along with surface roughness at different orientations
    4.1 MEASUREMENT SETUP
    4.2 LINE-MILLING EXPERIMENTAL MODEL
    4.3 PRE-MACHINING OF THE WORK PIECE
    4.4 EXPERIMENTAL CUTTING CONDITIONS
    4.5 SURFACE ROUGHNESS TESTER
    4.6 EXPERIMENTAL PROCEDURE
    4.7 SUMMARY
5 Experimental analysis of cutting forces
    5.1 ANALYSIS OF NUMEROUS CUTTING TOOLS AT DIFFERENT ORIENTATIONS
    5.2 TOOL#7
    5.3 TOOL#8
    5.4 TOOL#9
    5.5 SUMMARY
6 Discussion,Conclusion and Recommendations
    6.1 DISCUSSION BASED ON EFFECTS OF MACHINING ELEMENTS ORIENTATIONS ON ECCENTRICITY
        6.1.1 Tool#1
        6.1.2 Corresponding tools(tool#2-tool#6)
        6.1.3 Spindle and tool holder
        6.1.4 Important
    6.2 SURFACE ROUGHNESS RESULTS AND DISCUSSION BASED ON EFFECTS OF DIFFERENT ORIENTATIONS OF MACHINE ELEMENTS ON SURFACE ROUGHNESS VALUE
    6.3 DISCUSSION BASED ON EFFECTS OF DIFFERENT ORIENTATIONS ON CUTTING FORCES
    6.4 CONCLUSIONS
    6.5 RECOMMENDATIONS FOR FUTURE WORKS
References
Appendices
    Appendix 1
        1 Summary of Facilities in the Research
    Appendix 2
        2 NC Code for the Line Milling Experiments
            Test cut 1
導師簡介
作者簡介



本文編號：3254434