The fitting relationship in the assembly drawing occupies a more important position in the drawing design towel. In general, in addition to indicating the positional relationship and structure of each component, it is very important to determine the cooperation relationship between the various components, especially the dimensions of the precision and performance of the machine. Pay attention to indicate the cooperation relationship between them. Otherwise, the performance of the machine cannot be guaranteed.
When designing assembly drawings. Methods for determining limit tolerances and fits include analogy, calculation, and test. The calculation method and the test method are calculation methods or experimental methods to determine the cooperation method. It has the characteristics of reliability, accuracy, and science, but it takes a lot of cost and time, and it is too economical. The analog method is a method of determining the fit according to the use of parts and by referring to the empirical data of the existing fit of similar machinery. The basic point is statistical investigation, investigating the cooperation and use of components of the same type or similar structure, and then analyzing the analogy to determine its cooperation.
The analog method is simple and easy. The selected cooperation focuses on inheriting the actual experience of design and manufacturing in the past. Most of them have been verified by Ding, which has high reliability and is convenient for serialization and standardized production of products. The processability is also good. Due to the above advantages, the determination of the existence of limit coordination L has been used as an effective method. At present, this method is still the main method of mechanical design and manufacturing. This chapter discusses how to use the analog method for orange design.
The precision design of cutting machine is an important part of machine design. It doesn't matter if the design is a sophisticated and precise machine-finding and rocket. Or a simpler machine like a reducer. All need to consider the principle and conceptual design, the component [: art design and precision design. When designing for accuracy, VW needs to consider how to realize the functional requirements of the machine, and also whether it can be manufactured as required. It is impossible to achieve 100% accurate machinery in reality. The task outside precision is how to use terms such as limit fit, geometric tolerance, surface roughness, etc. Express the allowable difference when manufacturing the spare parts of the machine, so as to manufacture the machine that meets various performance indicators.