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 ebook discusses the basics of Computer-Aided Fixture layout (CAFD) strategies and covers fixture making plans, fixture layout (both modular and devoted fixtures), fixture layout verifications, and the general integration with CAD/CAM. The ebook exhibits how CAFD could lead to an important aid of product and technique improvement time and creation price, and the way CAFD can bring up caliber insurance via simulation and science-based technical specification and price estimation in enterprise quoting, particularly in present supplier-based production. It additionally offers case examine examples. * This ebook presents a complete answer of CAFD, together with making plans, layout, and layout verification* useful and entire theoretical research of fixturing from actual commercial program tasks* Introduces the combination of fixture layout and research with CAD/CAM in order that specific geometric details should be processed and intricate fixture designs could be designed and analyzed
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Extra info for Advanced Computer-Aided Fixture Design
Both of these motions can be represented mathematically. Cutter parameters and feature parameters determine the machine motion parameters. 25 shows several examples of machine motion. 26 shows the parameter-driven relationship between the hole feature and the cutter and tool path used to machine this feature. The cutter template and toolpath template are set up based on industry best practice. 25. Examples of machine motion. CH4 CH3 D1 H1 CH2 CH1=H1+delta_H1 CH2=H-H1*2+delta_H2 CH3=H1+delta_H1 CH4=CH4 H CH1 D approaching_value = 3 L12 = H+6 m m; Drilling L23 = CH1+CH2+CH3-H; Cham fer & spot face L34 = CH1; Cutter offset R44 = (D-CD1)/2; Back chamfer --- Tool path param eters are driven by both feature and cutter parameters.
As a result, manufacturing variations will stack up. This phenomenon is commonly known as tolerance stack-up. Although the other types of errors cannot be eliminated, Type VII errors can sometimes be reduced, if not eliminated, via setup planning. 10. Suppose one would like to make a 6-inch ruler with 1-inch divisions. 025 inch. There are two methods to make the ruler. The first method is to use an accurate 6-inch master ruler as a reference. The ruler to be made is placed against the reference ruler and seven marks are made.
The cutting tool is perfectly accurate and the effect of tool wear is trivial; that is, Type V errors are negligible. The effect of workpiece deformation due to clamping force, cutting force, gravity, and internal stress is trivial; that is, Type VI errors are negligible. When locating and clamping (setting up) the workpiece on the fixture, it is desirable that the workpiece coordinate system (WCS) coincide with the machine coordinate system (MCS). However, due to Type I and Type II errors the WCS will vary from the MCS.