The relationship between the appearance of various parts of CNC machine tools is closely related to each part of the appearance of the CNC machine tool design. In summary, there are three main relationships, 1 affiliation, such as the observation window of the door, the handle is part of the machine door The door can be regarded as part of the protective cover, which together with the protective cover constitutes the protective space of the machine tool, of course, the door can be moved and relatively independent. 2 constraint relationship, for example, the shape of the machine door should be constrained by the shape of the front façade of the machine tool guard, and the outer contour line should match the contour line of the front façade of the machine tool hood, and the change of the shape should generally follow the shape of the hood. Changes and changes; and the observation window and handle of the door are subject to the style of the machine door, and the scale of the shape should be coordinated with the door. 3 interactions, such as the interaction between the observation window of the door and the shape of the handle, the shape of the observation window of the door changes, the shape of the handle and its installation position must change accordingly. The key component groups in the overall shape of CNC machine tools are based on the above two points analysis. It is easy to see that the protective cover, numerical control panel, door, observation window and handle are the main components that affect the overall shape of the CNC machine tool. Among them, the door, the observation window and the handle are three. The components are inseparable from the tight connection. At the same time, these three components are also parts that can be moved and relatively independent in the whole machine. It is easy to change and has a great influence on the overall shape of the machine. Then, whether the door can be observed or not in the CBID system. Looking at the windows and handles as a whole key component group for recombination between cases? To this end, we conducted a usability evaluation test on the possible future users of 40 industrial designers, engineers and other systems. The experimental results show that the three components of the first group are combined separately because of the door, the observation window, and the handle. It is difficult to grasp how many combinations are combined with each other, and 75% of the subjects do not. Make a satisfactory plan within the specified time; the second group of subjects is to re-combine the case by treating the door, observation window, and handle as a whole key component group, and 85% of the subjects are at the specified time. I have made my own satisfactory plan. It can be seen that it is more scientific to re-combine the case, the observation window and the handle as an integral key component group in the CBID system. Therefore, in the CBID system, considering the construction of the key component modifier, the key components of the door, the observation window and the handle are recombined to provide design assistance for the user. Although the numerical control panel has a great influence on the overall shape of the CNC machine tool. However, the CNC panel needs to be outsourced, and there is limited room for selection, so it is not considered.) Fig.1 The key component group of the overall shape of the CNC machine tool 114 The relationship between the key component group and the overall shape 141 The coordination of the key component group and the overall shape The overall modeling coordination of the machine tool requires that the modeling styles of the various parts of the machine tool need to be consistent, the overall shape Style determines the key component group shape, which is the main aspect of contradiction. If the shape of the machine tool is mainly linear, then each component should consider its own shape as a straight line as much as possible. The transition between the straight line and the straight line should be uniform or the fold line should be unified, so that the main body of the machine tool and the various parts should echo each other, forming a uniform style. overall. As shown in Figure 2, the shape of the two different styles of machine tools, the shape of the key components of the door, observation window, and handle are consistent with the modeling style of the entire machine. The overall modeling style of the machine tool (a) in Figure 2 is very straight, and the style of the door, the observation window and the handle is also relatively tough; while the machine tool (b) in Figure 2 is a more rounded overall style. The style of the door, the observation window, and the handle are also much softer. Figure 2 The relative independence of the key component groups of the two different styles of machine tool 1412 and its improvement on the overall shape. The key component group should be coordinated with the overall shape of the machine tool on the one hand, and strive to be unified in the modeling style; The component group is a movable part in the whole machine tool body, and has relative independence and greatly enhances the overall shape. Most of the control machine tools enrich the overall shape of the machine through the change of the shape of the key components of the door, observation window and handle after the overall contour is determined. The same model of machine tool design has obtained two different sensational machine tooling schemes through the change of the key parts of the door, observation window and handle. The solution in Figure 3 (a) is very open due to the observation window in the key component group. Large, simple and succinct, it also makes the whole machine model feel more modern; and the scheme (b) in Figure 3 is too complicated and complicated because of the observation window in the key component group, which makes the modeling feeling of the whole machine tool more traditional. It can be seen that the change of the shape of the key component group will strongly affect the modeling feeling of the whole machine tool. Therefore, in the CBID system, a key component modifier can be used to reassemble the key component groups of each machine tool solution to obtain a new machine tool reference solution. Thereby providing design assistance to the user. Modification strategy of key component modifiers in case modification The modification strategy of key component modifiers in CBID system is based on general knowledge and case-reconstruction modification for manual intervention. A case combination refers to recombining a new design by deconstructing multiple design elements from multiple cases. In the recombination and modification of the case, the transformation and reuse of the case knowledge is achieved. For the designer, the case combination is based on the higher-level application method in the case design, and also requires the accumulation of reasoning experience and continuous improvement of the situational migration. Ability <5>. In the case of a numerically controlled machine tool, the overall shape of the machine tool is deconstructed into a plurality of modeling units according to the functional requirements of the partial appearance components of the machine tool, and the variable parts are respectively searched for each modeling unit. The change of the variable part will lead to the change of the shape of each unit, and the machine parts of different modeling features will be arranged and combined to obtain a variety of overall machine tool styles. Finally, evaluate all possible scenarios. During this period, it is necessary to consider the coordination of the modeling features between the local appearance parts and the overall shape of the machine tool and the partial appearance parts, and also consider the structural factors to obtain the shape that meets the functions and structural requirements of the CNC machine tool. The modified strategy model diagram of the key component modifier of the CBID system can clearly see how a new case is generated. Firstly, through the study of the relationship between the whole and the local in the design of CNC machine tools, the key components of the door, observation window and handle that affect the overall shape of the CNC machine tool are found. Then, the key component groups of the case are recombined through the key component modifier to obtain various The machine tool styling reference scheme; during this period, there is the transformation and reuse of each case knowledge, and also the general knowledge of the man-machine template in the system; finally, the user combines it to the satisfactory reference plan and then changes it to generate a new case. Conclusion Through the study of the relationship between the whole and the local in the design of CNC machine tools, this paper finds out the key component groups that affect the overall shape of CNC machine tools; then based on the relationship between the key component groups and the overall shape and the case re-combination in the case modification in CBID The key component modifier is built in the system; the key component modifiers are used to re-combine the key component groups of each case to realize the transformation and reuse of each case knowledge, and can provide users with a variety of numerical control machine tool modeling reference schemes, thereby realizing computer-aided CNC machine tools. Design. (Finish) The normal maintenance of school bus vehicles is related to the service life of the vehicles and the safety of drivers and passengers. Improper maintenance or use will cause vehicle failures and bring safety hazards. 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