As the flying development of mechanical manufacturing industry, of the product change faster and faster, pattern of traditional big batch production is progressively by in place of mode of small lot production is replaced, mechanical production system is about to get used to this kind of change to must be had taller flexible. Abroad already flexible production system (FMS) the significant step that regards development as new product, regard the main development of mechanical manufacturing industry as direction its.

Flexible the starting point that turn basically is mixed in the machine tool tool two respects, and built up fixture is tool flexible the focal point that turn. Built up fixture is the tooling with very high rate of a kind of standardization, seriation, generalization, it is all sorts of good by a prefabricate different figure, different specifications, different measurement, standard unit that has complete interchangeability and combination, the fixture that by the treatment of workpiece the requirement is assembled and becomes. After because built up fixture is used,finishing, can disassemble, clean, assemble new clamping apparatus afresh, accordingly, the application of built up fixture is very general, agree with especially much breed, medium the production of small lot.

However, come for years, to design and be being assembled of built up fixture, as a result of the limitation of time, ambient conditions, overall design and construction of system can serial cannot run paralell. Division of clamping apparatus technology places a design to basically depend on experience to the fixed position of workpiece, outfit, qualitative analysis is more, quantitative analysis is less, and calculation is complex, at the same time lack optimizes a design necessarily, the blueprint of the design is not quite intuitionistic. In the process that hold clip the worker should digest blueprint seriously, design the potential problem of course early days, in the collect when general assembly, the result that short of expects, cause do poorly done work over again even. The assembly in designing a process interferes a problem, cannot discover ahead of schedule in the design, the labor strength that causes a worker increases. Had gotten used to the production demand of current and fast, diversification very hard. This one characteristic assists the development that assembles a system and development for the computer, raised the question that resolves urgently.

Traditional built up fixture designs main support to be finished by hand, CAD design system basically is used achieve type to devise a method partly with what seesaw pattern gives priority to. Now, software of many and three-dimensional hypostatic model rises abruptly, wait like Pro / E, Solidworks, UG, Solidedge, drove the new revolution that designs a domain, as a result of these three-dimensional software, can establish three-dimensional and hypostatic model not just, still can use a design to give three-dimensional model to undertake imitate is assembled interfere analysis of examination, orgnaization, trends to interfere examination, kinetic analysis, intensity analysis to wait with the static state. At the same time the component as a result of built up fixture is standard component entirely, and the amount is limited, store easily and retrieve wait for a characteristic, make build station of built up fixture to become a possibility. If apply the CAD in design of built up fixture, go to application of Pro / E especially in design of built up fixture, can make the design of built up fixture very quick, assemble productivity to be able to rise significantly.
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