毛坯尺寸基准的理论与应用研究

发布时间：2018-05-16 04:07

本文选题：毛坯尺寸式 + 粗加工余量　；参考：《太原科技大学》2011年硕士论文

【摘要】：对于机械产品设计来讲,毛坯制造是机械制造的第一步,对提高零件的精度,降低成本,保证整体制造过程的顺利完成,具有重要的作用。目前,毛坯尺寸的设计大都是在零件图尺寸的基础上加上或减掉总加工余量得到的。这种设计方法十分简便,并且已形成了习惯,被社会普遍认可。但是这种选取毛坯基准、计算毛坯尺寸的方法并不十分合理。因为它既不能保证毛坯各加工面粗加工余量公差最小,也不能保证各非加工面与加工面之间的尺寸及位置误差最小。本文针对毛坯各加工面粗加工余量公差,以及各非加工面与加工面之间的尺寸及位置误差两方面对优化方案进行研究。运用建立毛坯尺寸式的方法,进行分析优化,得出更合理标注模式。这种方法不仅寻找毛坯尺寸关系简便,易于表达毛坯图的结构特征,而且为实现毛坯尺寸的计算机优化提供了一条可行的新途径。在本论文中完成了以下工作： (1)通过分析毛坯各要素间关系,定义了毛坯尺寸式的概念,并对国家标准中毛坯尺寸、机械加工余量、公差等级等进行了研究,为后续工作提供理论支持和参数支持。 (2)在本文第四章、第五章中,通过毛坯尺寸式和位置关系路线图的方法,对毛坯各加工面粗加工余量及公差,以及各非加工面与加工面之间的尺寸及位置误差进行了详尽分析,提出了优化方案和解决方法。 (3)结合实例,运用VB语言和Access2003数据库作为应用程序的开发平台,开发出了简便、实用的毛坯尺寸计算软件,并详细说明了该程序的实现过程。
[Abstract]:For mechanical product design, blank manufacturing is the first step in mechanical manufacturing. It plays an important role in improving the precision of the parts, reducing the cost and ensuring the smooth completion of the whole manufacturing process. At present, the design of the blank size is mostly based on the size of the part drawing or reducing the total processing allowance. This design method is ten The method is not very reasonable, because it can not guarantee the minimum tolerance of rough machining allowance and the minimum dimension and position error between the non machining surface and the processing surface.
In this paper, the optimum scheme is studied in two aspects, the tolerance of rough machining allowance, and the size and position error between the non machining surface and the machining surface. The method of establishing the blank size formula is used to make the analysis and optimization, and the more reasonable marking model is obtained. This method is not only easy to find the relationship of blank size, but also easy to express. The structural characteristics of the blank drawing also provide a feasible new way to realize the computer optimization of blank size.
The following work has been completed in this paper:
(1) through the analysis of the relationship between each element, the concept of blank size is defined, and the blank size, machining allowance and tolerance level in the national standard are studied, and the theoretical support and parameter support are provided for the follow-up work.
(2) in the fourth chapter and the fifth chapter, the rough machining allowance and tolerance of each processing surface, as well as the size and position error between the non machining surface and the machining surface are analyzed in detail, and the optimization and solving methods are put forward.
(3) combining the example, using the VB language and the Access2003 database as the development platform of the application program, a simple and practical software for calculating the blank size is developed, and the realization process of the program is explained in detail.

【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH161

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