工艺系统安装方位对铣削偏心的影响实验研究

发布时间：2021-06-28 13:47

　　偏心是对工件表面光洁度、加工尺寸精度和刀具寿命等产生不利影响的几个关键因素之一。偏心的定义为偏离中心轨迹,在切削过程中的偏心定义为主轴、刀柄和刀具的旋转轴不是其中心线,而是中心线的平行线,偏心是由主轴、刀柄、刀具的装夹偏差和几何外形缺陷引起的。偏心误差由两个几何参数偏移幅度矢量e_c和角位置矢量λ_c组成。在切削参数较大时,较小的偏移值引起的后果可能不显著,而在切削参数较小时,它可能会导致切屑量、铣削力等的周期性偏差。其他研究只显示了偏心对切削力等因素的许多不利影响,而本研究目标在于减少铣刀刀刃上的最终偏心误差,并揭示不同的主轴、刀柄、刀具的安装方位影响其外形轮廓和中心轴线的方式。这一问题的解决非常重要,因为偏心率与切削力成正比,过大的切削力会导致整个加工系统的变形,并产生意外的缺陷部件,因此开展了旨在不消除但减少这一误差的研究工作。本论文的主要研究工作为:（1）在CNC立式铣削加工中心上进行了大量测量实验。采用在轴向分层的方法,使用Swiss SYLVAC千分表测量了主轴、刀柄、刀具的各种装夹方位组合下每层的几何缺陷,分析得到各层的几何偏差,再... 

【文章来源】：广东海洋大学广东省

【文章页数】：204 页

【学位级别】：硕士

【文章目录】：
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
导师简介
作者简介



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