Advanced Computer-Aided Fixture Design by Yiming (Kevin) Rong, Samuel Huang

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) suggestions and covers fixture making plans, fixture layout (both modular and devoted fixtures), fixture layout verifications, and the general integration with CAD/CAM. The e-book indicates how CAFD could lead to an important aid of product and procedure improvement time and creation expense, and the way CAFD can bring up caliber coverage via simulation and science-based technical specification and value estimation in company quoting, in particular in present supplier-based production. It additionally presents case examine examples. * This e-book presents a complete resolution of CAFD, together with making plans, layout, and layout verification* useful and finished theoretical research of fixturing from genuine business program initiatives* Introduces the mixing of fixture layout and research with CAD/CAM in order that particular geometric details will be processed and complicated fixture designs should be designed and analyzed

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The three coordinate values of P’ are x’= g1(x0, y0, z0, ϕ, θ ), y’= g2(x0, y0, z0 , ϕ, θ), and z’ = g3(x0, y0, z0 , ϕ, θ ), where ϕ is the angle between two datums (plane XOY and X’OY’ ) and θ is the angle between axis Z and Z’. 3. Draw a normal line of the surface F(x, y, z) = 0 from point P′ , let the intersection point of the normal line and F(x, y, z) = 0 be N(x”, y”, z”). 4. The points lying between the two enveloping surfaces formed by the tolerance zone should satisfy (x’-x”)2 + (y’-y”)2 + (z’-z”)2 ≤ (δ/2)2.

To ensure the profile tolerance, P’ should be within the enveloping circles. , OP − OP' ≤ δ / 2 ), which can be written as x'2 + y '2 − r (ϕ ) − δ / 2 ≤ 0 . 2 TOLERANCE ANALYSIS IN SETUP PLANNING 45 Let the following equation denote the result by substituting Eq. 14 into Eq. 15. 16) If Eq. 16 holds, then all points on the profile can be controlled within the range of the tolerance zone. In general, solving the equation ∂F = 0 ∂ϕ will allow one to find the point that has the maximum deviation, and hence compute the value of normalized tolerance.

That is, a setup plan is generated without human intervention whenever a part design specification is given. Currently, generative algorithms can gracefully handle parts with moderate complexity. For more complicated parts, certain human interaction is needed to ensure a good solution. This is referred to as an integrated setup planning, explored in the next section. 1 Mathematical Formulation of Setup Planning Rigorous problem formulation is a prerequisite in ensuring the robustness of solution methodology.

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