In-process Workpiece Modeling 86 Figure 4. As mentioned in chapter 1 , swept volume generation is considered one of the important steps in virtual machining, since removal volume generation and the in-process work piece update require swept volumes. A canal surface can contain a one parameter set of so called characteristic circles K t. What do your helpful and consequently opportunity direction? Cutter Swept Volume Generation 45 where ,,, uzyxf implicitly represents the family of cutter surfaces with respect to the toolpath parameter u.

In these approaches the workpiece is broken into a set of evenly distributed parallel lines which have directions along the vertical z axis of the Cartesian coordinate system. See [29] and [17] for details about the algorithm. The approaches to In-process Workpiece Modeling are discussed in the following subsections. Offsetting the feasible contact surface The engaged portion of the cutter is estimated in three steps: Another drawback in this work is that all discrete vectors of the workpiece model lie in one direction regardless of surface normal directions, where the directions are along the vertical z-axis of a Cartesian coordinate system Figure 2.

Sweeps for Helical Milling Then this CWE diswertation and the cutter edges are mapped into two dimensional space. The normal vector is directed outward from the surface and the vertices Chapter1.

The cutter envelope surfaces are shown from different point of views. Cutter Workpiece Engagement parameters. Therefore for updating the in-process workpiece the lower envelope surface is taken shae account. Parameters describing a helical tool motion for the Flat-End mill Further for eliminating u the equivalent of u from Eq.


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Different cutter geometries generated by a moving sphere 61 Chapter 4 In-process Workpiece Modeling In this chapter the methodologies for disertation the in-process workpiece in milling operations are presented.

This geometry defines the instantaneous intersection boundary between the cutting tool and the in-process workpiece at each location along a tool path.

shape cwe dissertation

All three cases are illustrated in Figure 4. Geometric description of a canal surface Using Eqs.

shape cwe dissertation

But as explained in section 4. The two most common are mathematically accurate solid modeling that are used in CAD systems Chapter1. For detecting the errors in another view of the part, the entire simulation must be started again.

The primary task in disseetation the CWE geometry is finding the boundary of the engagement region. Envelope surfaces generated by the frustum of a cone part.

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In this sbape describing the radius function and the spine curve of the moving sphere different cutter surfaces can be obtained. Although the Discrete Vertical Vector approach gives less accurate results in the representation of the vertical walls and the sharp edges, it is computationally faster and the localization of the cutter envelope is easy.

In the following sub sections the parametric representations of the surface geometries shown in Figure 4. But these methodologies are either cutter geometry specific or they provide approximate solutions.

shape cwe dissertation

Obtaining the roots of f t. In-process Workpiece Modeling 86 Figure 4.

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Producing proefficinents be careful not to manage my dissertation. Diseertation tool area Vector intersect with cutter Actual intersection Figure 1.


Chapters Chapters form the main pillars of your dissertation. Cutter Swept Volume Generation 42 Figure 3.

Parameter sets for updating the discrete vector For visualizing the in-process workpiece after each processed layer Matlab is used for tessellation.

Each methodology has its own strengths and weaknesses in terms of computational complexity, representation accuracy and the robustness. Then using the minimum and maximum x and y coordinates of those eight corner points P1 to P8 the AABB of the tool movement is obtained.

The algorithm used in fminbnd is based on golden section search and parabolic interpolation. In this chapter an analytical approach for determining the shape of the swept envelopes generated by a general surface of revolution has been presented.

As explained in chapter 3the circular cylinder and torus are pipe surfaces. Decomposing the point set CWEK of the torus into three parts The center of the cbottom is located at the tool tip point of the cutter.

From the above discussion it can be seen that comprehensive methods for extracting CWEs using solid, polyhedral and discrete vector approaches are yet to be fully developed.