摘要数控车床正在向着速度更快、精度更高、效率更好的方向发展，这必须需求车床的生产性能很高而且车床整体重量很轻便。床身是车床的最为重要的部位，他的结构以及性能将会直接影响车床的生产性能[1]。车床的结构性能主要有静态特性、动态特性和热特性等。其中动态特性的改变对降低床身振动影响很大。本文研究了CA6140车床床身的结构性能在模态分析的基础上进行结构优化。51275

本文在三维建模软件Pro/E中依据图纸，利用车床的零部件造型模块建立床身的三维模型。我们将建立好的三维模型导入到有限元分析软件ANSYS中，建立床身的有限元模型，然后对床身进行受力分析。床鞍是床身受力的主要来源。通过对床鞍与床身的作用力分析，可以把床身的力学模型构建起来。利用有限元分析软件ANSYS其中的优化分析模块，对CA6140车床床身进行模态分析和有限元结构优化。

经过我们对CA6140车床床身结构的有限元分析和结构优化，减少了床身的整体体积，节省了床身的用料，床身的材料刚度、强度以及固有频率等指标也得到了不同程度的提高，同时使其他类型车床的设计生产拥有了更加丰富的理论性依据。

毕业论文关键词:车床床身；Pro/E；有限元；结构优化

 Abstract Nc machine tools are moving faster, higher precision and higher efficiency in the direction of development, which must requires high machining performance of machine tool and machine tool as a whole is very light in weight[1]. Lathe bed is the most important parts of the machine tool. The structure and the performance will directly influent the performance of the machine tool processing. The structure of the machine tool performance are mainly static characteristics, dynamic characteristics and thermal characteristic, etc. With the change of the dynamic characteristics of lathe bed vibration influence is very big. In this paper, we study the structure of CA6140 lathe bed performance can be optimized on the basis of modal analysis.

In this article, parts modeling module of machine tool is used to establish the three-dimensional model of lathe bed in the 3D modeling software Pro/E based on the drawings. We will construct a good 3D model is imported into the finite element analysis software ANSYS, established finite element model of lathe bed, then the stress analysis was carried out on the bed. Saddle lathe bed is the main source of stress. Through force analysis of the bed saddle and lathe bed, can be built from the mechanics model of the lathe bed. Using finite element analysis software ANSYS, the optimized analysis module, the CA6140 lathe bed for modal analysis and finite element structural optimization.

This article Uses the method of combining the scientific calculation and practical experience. Analogy of similar lathe bed structure and on the basis of finite element analysis of the data optimize the structure of the bed.

After taking analysis and structure optimization on structure finite element of CA6140 lathe bed, we reduce the body's overall volume, save the bed materials and bed material stiffness, strength and natural frequency index has also been improved to varying degrees. At the same time makes the design and production of other types of machine tool has a more rich theoretical basis.

Key words：lathe bed; Stiffness; The finite element analysis; Structure optimization 

目录

摘 要 I

Abstract II

1.1  课题的研究背景及意义 1

1.2  国内外的研究现状 1

1.2.1  国内的研究现状 1

1.2.2  国外的研究现状