Abstract: This paper briefly introduces the application status of combined fixtures in flexible manufacturing systems, focusing on the application of 3D solid modeling software Pro/E for computer-aided combination fixture design, including database construction, workpiece model creation, assembly, assembly analysis. And the description of the steps such as the processing of related information. In this way, the research application of computer-aided fixture design will promote the development of flexible manufacturing.
Key words: flexible manufacturing system; combined fixture; 3D solid modeling software Pro/E; database construction; assembly
0 Preface
With the rapid development of the machinery manufacturing industry, the upgrading of products is getting faster and faster. The traditional mass production mode is gradually replaced by the small and medium batch production mode. The mechanical manufacturing system must have high flexibility to adapt to this change. Foreign countries have adopted flexible manufacturing systems (FMS) as an effective means of developing new products and as the main development direction of machinery manufacturing.
The focus of flexibility is mainly on the machine tool and tooling, and the combined fixture is the focus of tooling flexibility. The combined fixture is a standardized, serialized, highly generalized process equipment. It is a set of pre-manufactured standard components and assemblies with various shapes, different specifications, different sizes and complete interchangeability. , a fixture assembled according to the processing requirements of the workpiece. Since the combination fixture can be disassembled, cleaned, and reassembled with new fixtures after use, the application of the combination fixture is very common, especially for multi-variety, medium and small batch production.
However, over the years, the design and assembly of the combined fixtures, due to time and environmental constraints, the overall design and system structure can only be serially in parallel. The fixture technician relies on experience in the positioning and clamping design of the workpiece. There are many qualitative analysis, less quantitative analysis, complicated calculation, and lack of necessary optimization design. The design drawings are not intuitive enough. In the process of clamping, workers should digest the drawings carefully, and the potential problems in the early stage of the design process are summarized in the final assembly, which does not achieve the expected results and even causes rework. The problem of assembly interference during the design process cannot be found in advance in the design, resulting in an increase in the labor intensity of workers. It has been difficult to adapt to today's fast, diverse manufacturing needs. This feature is the development and development of computer-aided assembly systems, and puts forward the problems that need to be solved urgently.
The traditional combination fixture design relies mainly on manual completion, and the CAD design system mainly adopts a semi-created design method based on interaction. Nowadays, the rise of a large number of 3D solid modeling software, such as Pro/E, Solidworks, UG, Solidedge, etc., has promoted a new revolution in the design field. Because of these 3D software, not only can 3D solid models be created, but also 3D models can be designed. Simulation assembly and static interference inspection, mechanism analysis, dynamic interference inspection, dynamic analysis, strength analysis, etc. At the same time, since the components of the combined fixture are all standard parts, and the number is limited, it is easy to store and retrieve, which makes it possible to establish a combined fixture station. If computer-aided design is applied to the combined fixture design, especially when Pro/E is applied to the combined fixture design, the design of the combined fixture can be very fast and the assembly productivity can be significantly improved.
1 building library
1.1 The necessity of building a library
Although the system itself has a large number of feature libraries: including a small number of combined fixture standard parts, it is an indisputable fact that the number of standard fixtures of various specifications and sizes is very large. In general, the combined fixture assembly station is only configured. Some standard parts, while the standard parts produced by different manufacturers are slightly different, this situation will inevitably affect the design effect and efficiency. If the standard parts library can be re-created according to the standard parts actually assembled by the assembly station, the existing standard parts can be fully utilized to design the combined fixtures, and the standard part model can be created without duplication, and the standard parts are retrieved more quickly. . In this way, the designer can select the parts directly in the standard parts library, and realize the dynamic simulation assembly of the combined fixtures very quickly.
1.2 Structure of the combined fixture library
The combined fixture is a new type of process equipment developed on the basis of standardization of fixture components. It consists of a set of pre-customized standard components and assemblies of various sizes and sizes. Before processing the workpiece, according to the process requirements of the workpiece, the equipment and fixture design principles adopted, the fixture components are selected, the positional relationship between the components is determined, and the fixtures used for machining are assembled. There are a large number of basic components of the combined fixture. For easy classification and convenient retrieval of standard parts, the combined fixtures can be divided into nine categories, namely basic parts, support parts, positioning parts, guide parts, pressing parts, fasteners, and other parts. And the combination, each of which includes multiple varieties, each of which has different specifications.
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