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2024-07-30 17:49本頁(yè)面
【正文】 ture Knowledge group Characteristics Part geometry Geometry: holes, slots, etc. Dimensions Tolerances Machining process Type of machining process Machining phase and sub phase Machining operation Functional and detailed Methodology of design fixture design process Design rules Interpretation rules Design constrains Fixture resources Type of fixture (modular, general, or dedicated) (functional elements Type of fixture elements (support, locate, clamp) and mercial elements) Type of machine tool (vertical milling machine, horizontal milling machine, etc.) The proposed structural model contains a general structure of the knowledge groups related with the fixture design process. The description of theaspects related with the knowledge groups are presented in Table 1. Fig. 2 shows the general structure of the knowledge groups for machining fixture design process. Due to the plexity of the fixture design process, the fixture design cannot be considered as an independent process with respect to the manufacturing process. In this sense, the information of the manufacturing process isdirectly represented in the fixture design process. In a similarway, the resources involved in the manufacturing process have a narrow relationship with the fixture resources, in terms of machine tools and mercial elements of fixture. The definition of each knowledge groups (see Table 1) has taken into consideration the attributes and necessary operations to represent the knowledge relative to these knowledge groups. The applications of these models are presented in the following sections. Fig. 2. Structural model for machining fixture. 4. Knowledge template model In this section, we describe those pieces of the knowledge model thatcan be reused in other applications using the method of knowledge template.From a conceptual point of view, a knowledge template describes a piece of the knowledge model in which the inference and the knowledge tasks are defined with the objective of reuse this knowledge in other similar applications. In this sense, it is necessary to distinguish among the analytic and the synthetic tasks. The analytic tasks define the classification of the objects involv Fig. 3. Knowledge tasks based on the structural model. ed in the fixture design process. The synthetic tasks have relationship with the reasoning way procedure from which a fixture solution is obtained. Using these two types of tasks, a first approach has been established to define the knowledge groups that can be classified under the analytic and synthetic tasks. Fig. 3 shows the objects of the structural model that describe the analytic and synthetic tasks of the machining fixture design process. The division of these two tasks allows to set in a first level the knowledge groups, that it objects and attributes that can be employed in the development of new applications. Also, this separation allows us to identify those knowledge groups that describe inference procedures in the design process,as the functional fixture design and the detailed fixture design. This section presentsthe definition of the tasks of the knowledge model classified under theconcept of analytic and synthetic tasks that can be reused in other applications. . Analytic task definition The entities (or classes) defined under this category can be classified regarding the level of dependence level that present the objects involved in the machining fixture design. The first level defines those knowledge groups that are not consequence of the fixture design process, as geometry, dimensions and tolerances of the part. In this level, the entities that pose these knowledge groups can be totally reused in their structure, relationships and attributes. Fi
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