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复杂尺寸链的计算机辅助公差分析

发布时间:2018-01-31 05:00

  本文关键词: 复杂尺寸链 公差建模 敏感度 贡献度 CETOL6σ 出处:《安徽农业大学》2015年硕士论文 论文类型:学位论文


【摘要】:课题研究内容是选取三个典型机构,分别对其建立复杂尺寸链,运用基于CATIA的公差分析软件CETOL6σ,在三维实体模型的基础上建立三维公差模型并分析计算得到结果,将尺寸链理论算法与软件的计算结果进行对比,根据评估结果进行优化,此外还利用软件的计算结果分析了各个尺寸链中组成环的贡献度和敏感度。主要内容如下:1)主要是以犁刀变速齿轮箱为例,对箱体安装平面的四个安装孔的位置精度提出了三种不同的标注方法,并利用基于CATIA的公差分析软件CETOL6σ建立三维公差模型,对三种标注方法分别进行分析,利用尺寸精度控制成组孔的位置精度会造成累计误差,利用位置度并实行最大实体要求控制成组孔的位置精度能够保证零件的互换性,扩大位置度公差,提高合格率,降低成本,为产品的设计提供了一定的指导。2)对一曲柄滑块机构进行运动学及动力学的理论分析,建立了装配尺寸链并结合公差分析软件CETOL,对曲柄滑块机构的滑块的装配偏差进行分析,并对分析结果的敏感度和贡献度进行讨论。可知,按照极值法和统计法分析滑块A面与支架的B面之间的距离都在设计范围内,也表示理论计算值在CETOL的结果分布范围内,并且得出在理想状态下,该曲柄滑块机构的运动轨迹偏差大小为+0.285mm~-0.295mm的结论。3)将PF4-CFT三维模型进行简化后,分别从T方向和Z方向两个方面分析了超导母线安装过程中可能会出现的误差,建立T方向和Z方向的尺寸链并利用公差分析软件建立公差模型,在Z方向槽的位置变化导致隔板的变化角度大于间隙造成的变化量,隔板在Z轴方向的平移的最大距离可达到4.1mm,因为超导母线是安装在支撑板上,如果要保证其安装,则必须将超导母线与支撑这就只有采取在支撑板上加点垫片来保证安装。而在T方向由于安装孔的位置变化会直接关系到超导母线的安装,而安装孔的位置与槽底面的距离会发生变化,所以以孔1和孔21为例,利用CETOL分析得到在孔1及孔21位置的安装误差可能达到2.741mm和2.73mm,必须通过修正装夹的装置来弥补误差。
[Abstract]:In this paper, three typical mechanisms are selected to establish the complex dimension chain, and the tolerance analysis software CETOL6 蟽 based on CATIA is used. The three-dimensional tolerance model is established based on the three-dimensional solid model and the results are analyzed and calculated. The size chain theory algorithm is compared with the calculation results of the software and optimized according to the evaluation results. In addition, the contribution and sensitivity of the ring in each dimension chain are analyzed by using the calculation results of the software. The main contents are as follows: 1) the main example is the variable speed gearbox of the plow cutter. This paper presents three different marking methods for the position accuracy of four mounting holes in the mounting plane of the box, and establishes a three-dimensional tolerance model by using the tolerance analysis software CETOL6 蟽 based on CATIA. The three labeling methods are analyzed, and the accumulative error will be caused by controlling the position accuracy of the group holes by using the dimension accuracy. Using the position degree and implementing the maximum entity requirement to control the position accuracy of the group holes can guarantee the interchangeability of the parts, enlarge the tolerance of the position degree, increase the qualified rate and reduce the cost. The kinematics and dynamics of a crank slider mechanism are analyzed theoretically, and the assembly dimension chain is established and combined with the tolerance analysis software CETOL. The assembly deviation of the slider of the crank slider mechanism is analyzed, and the sensitivity and contribution of the analysis result are discussed. According to extreme value method and statistical method, the distance between A plane of slide block and B plane of bracket is in the design range, which also indicates that the theoretical calculation value is in the distribution range of CETOL result, and the result is obtained in ideal state. The conclusion that the track deviation of the crank slider mechanism is 0.285 mm -0.295 mm) simplifies the three-dimensional model of PF4-CFT. The possible errors in superconducting busbar installation are analyzed from T direction and Z direction respectively. The dimension chain in T direction and Z direction is established and tolerance model is established by using tolerance analysis software. The angle of the diaphragm is larger than that of the gap, and the maximum distance of the partition in the Z axis can reach 4.1 mm, because the superconducting bus is installed on the supporting plate. If it is to be installed, the superconducting busbar and brace must be added to the supporting plate to ensure the installation. However, due to the location change of the mounting hole in the T direction, the superconducting busbar is directly related to the installation of the superconducting busbar. The distance between the location of the mounting hole and the bottom surface of the groove will change, so take holes 1 and 21 as examples. By using CETOL analysis, the installation errors in hole 1 and hole 21 may reach 2.741 mm and 2.73 mm, which must be compensated by modifying the clamping device.
【学位授予单位】:安徽农业大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TG801;TP391.7

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