By Yiming (Kevin) Rong, Samuel Huang
Fixtures--the part or meeting that holds a component present process machining--must be designed to slot the form of that half and the kind of machining being performed. This booklet discusses the basics of Computer-Aided Fixture layout (CAFD) concepts and covers fixture making plans, fixture layout (both modular and committed fixtures), fixture layout verifications, and the final integration with CAD/CAM. The ebook exhibits how CAFD could lead to an important aid of product and strategy improvement time and creation price, and the way CAFD can raise caliber coverage via simulation and science-based technical specification and value estimation in company quoting, specifically in present supplier-based production. It additionally presents case examine examples. * This e-book offers a complete answer of CAFD, together with making plans, layout, and layout verification* sensible and finished theoretical research of fixturing from genuine business software initiatives* Introduces the combination of fixture layout and research with CAD/CAM in order that distinct geometric info might be processed and complicated fixture designs might be designed and analyzed
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Extra resources for Advanced Computer-Aided Fixture Design
When a profile of a line control is specified, the tolerance zone is two uniform lines (a 2D tolerance zone). Suppose the equation for the profile is ⎧ x 0 = r (ϕ ) cos ϕ ⎨ ⎩ y 0 = r (ϕ ) sin ϕ . 19a). Suppose due to errors in locating, the profile feature is machined at a deviated position. 19b). 14) + = = cosθ ⎥⎦ ⎢⎣ y0 ⎥⎦ ⎢⎣b ⎥⎦ ⎢⎣ x0 sin θ + y0 cosθ + b ⎥⎦ ⎢⎣ r (ϕ ) sin(θ + ϕ ) + b ⎥⎦ ⎡ x' ⎤ ⎡cosθ ⎢ y '⎥ = ⎢ sin θ ⎣ ⎦ ⎣ where θ is the rotation angle and (a, b) is the coordinate of O' in the XOY coordinate system.
8) 2 To ensure the parallelism tolerance, points P1 and P2 must lie within the tolerance zone; that is ( y 2 − y1 ) 2 + ( z 2 − z1 ) 2 ≤ δ 2 . Therefore, cosϕ ≤ L δ 2 + L2 . 36 CHAPTER 2 Computerized Manufacturing Setup Planning The worst case occurs when the end points of the inclined axis are situated on the exterior circle of the tolerance zone and the angle ϕ reaches maximum. 9) ⎝L⎠ where L is the length of the toleranced axis. 14. Analysis of perpendicularity tolerance: (a) part incorrectly located (due to rotation error) and (b) cross-section view of the machined part.
Due to the rotation error in locating, points on the toleranced feature surface will deviate from their ideal positions. 12. Deviation of machined feature due to locating errors. 12 shows an example part the top surface of which has a parallelism tolerance δ with respect to the bottom surface. Assume the part is in its ideal form but located imperfectly. As a result, the toleranced feature deviates from S0 to a new plane S described by the equation Ax + By + Cz + D = 0. Due to the presence of rotation error, points on plane S will have different z coordinate values.