By Yiming (Kevin) Rong, Samuel Huang
Fixtures--the part or meeting that holds an element present process machining--must be designed to slot the form of that half and the kind of machining being performed. This publication discusses the basics of Computer-Aided Fixture layout (CAFD) suggestions and covers fixture making plans, fixture layout (both modular and devoted fixtures), fixture layout verifications, and the general integration with CAD/CAM. The publication indicates how CAFD could lead to an important relief of product and approach improvement time and construction price, and the way CAFD can raise caliber insurance via simulation and science-based technical specification and price estimation in company quoting, specially in present supplier-based production. It additionally presents case examine examples. * This booklet offers a complete resolution of CAFD, together with making plans, layout, and layout verification* sensible and finished theoretical research of fixturing from actual business software initiatives* Introduces the combination of fixture layout and research with CAD/CAM in order that designated geometric info will be processed and complicated fixture designs will be designed and analyzed
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Additional info for Advanced Computer-Aided Fixture Design
The dimensions obtained using different setup methods are affected by different manufacturing error sources and should be treated differently. To investigate the manufacturing errors involved in the dimensions obtained using different setup methods, the following assumptions are made: • • • • The part to be machined is located and clamped on the machine table using a fixture. The fixture is perfectly setup on the machine table; that is, Type III errors are negligible. The cutting tool is perfectly accurate and the effect of tool wear is trivial; that is, Type V errors are negligible.
Because the bottom surface is parallel to plane S, points on the bottom surface will also have different z coordinate values. Ignoring machining errors, the machined top surface will be parallel to the ideal datum but not the bottom surface. If the part is located such that the difference between the points having the maximum and minimum z coordinate values (on plane S) is less than δ, the parallelism tolerance can be assured. 5) where G(x,y) = 0 is the equation for the contour of the machined feature and is either continuous (such as a circle) or piecewisely continuous (such as a polygon).
Mapping from resource capability to part feature is driven by cutter capability at the feature level. A feature may have several alternative manufacturing processes. Each process may have specific requirements for cutter design and motions. 24. 23. Relationship of manufacturing features and resources. 24. Information structure of a process model. In the process model, the cutter type determines the basic motion types that are divided into primary and feed motions. Both of these motions can be represented mathematically.