2 Division of machine tool modules The modular design of the machine tool consists of two processes. One is how to abstract the function according to the design requirements and the process of creating the module reasonably. The second is how to reasonably select a set of modules according to the design requirements and produce the assembly plan of the machine tool. The problem of module creation is the core of modular design, and the division of modules is the first problem to be solved. 3 Characteristic analysis of the system model To achieve integration of the various subsystems in the system, the system model includes a modular model and a machine assembly model. Figure 2 module feature hierarchy tree Previous page next page Measuring Tape,Metric Tape Measure,Rolling Tape Measure,Metric Tape SHANGQIU CHAOYUE MEASURING TOOLS CO., LTD , https://www.calibrateds.com
2.1 Principles of division of machine tools
To carry out the modular design, the product must first be divided into several modules, and then the module is used as the basic unit. Modules must be interchangeable, versatile, and standardized. Therefore, the rationality of module partitioning has a great impact on the performance, appearance, and generalization and cost of modular products. The module division of this paper is based on functional decomposition, and the degree of functional decomposition of the machine tool is the key to module division. If the part level is determined as the most basic module, the versatility is high, but the meaning of the module design is lost; and the degree of integration of the function is too high, which will affect the flexibility of the module assembly. This paper draws on the research of peers, refers to the principle of component division of combined machine tools, and combines the actuality of the factory to determine the principle of module division as follows:
(1) The principle of independence. Including the independent function and independent structure of other modules, it helps to serialize the module to realize the vertical series machine design. The connection method and connection elements of the assembled joint surface should be standardized and serialized to ensure the possibility of assembly and interchangeability between modules.
(2) Component principle. The splitting of the combined machine tool mainly follows the component principle to ensure the relative independence of the structure.
(3) Component principles. Further functional decomposition of components with excessively integrated functions to modularize components.
(4) Basic parts principle. The function and structure of the basic parts are relatively independent, such as the bed body, the column, etc., the materials are mostly castings or welded parts, and the production and processing cycle is long, which affects the rapid modification of the product. Based on the same type of connection, the basic component module of interface standardization and generalization can be established, which can produce a wide variety of products most economically under the premise of lower cost.
2.2 Module division of CNC machine tools based on functional decomposition
At best, the product is the carrier of the function. The customer purchases one or more functions. Therefore, functional analysis is an important means of engineering design [10] , and it is also the basis of modular design. The functional analysis method determines the total function by analyzing the user's requirements for the product, and then decomposes the total function, and then decomposes the function element according to the classification method. According to the principle of solution, the function element is solved, and the original understanding of the function element is obtained, that is, the most basic module. The original understanding of the functional element is to select and mutate to form an alternative to the original understanding of the sub-function of the upper level, and to rationally combine them to seek the optimal overall solution. The morphological matrix is ​​a clearer form of expressing the above work.
According to the principle of module division, and referring to the practical experience of the machine tool factory for many years, this paper uses the function analysis method to establish a general model of CNC machine tool module division. After conceptual decomposition and synthesis of the horizontal machining center, eight functional modules (first level) and eighteen functional modules (second level) are obtained, and the resulting modules are functionally independent and structurally interchanged. And the characteristics of the structure classification. In addition, each module (or sub-module) is not affiliated with a certain type of machine tool (or module) and can be used across classes.
3.1 Module feature analysis
Based on the feature analysis of a large number of modules, the concept of module feature hierarchy tree that satisfies the requirements of structural motion simulation based on features is proposed, as shown in Figure 2. The module is divided on the basis of functional analysis. The other aspects of the module model are the functions of the function. The selection of the module during the assembly of the machine tool is also based on the functional characteristics of the module. The functional shape features are extracted from the geometric implementation angle of each function. 