Mixed CAD Method to Develop Gear Surfaces Using the Relative Cutting Movements and NURBS Surfaces

Tolvaly-Roșca, Ferenc; Forgó, Zoltán

doi:10.1016/j.protcy.2015.02.004

Cited by 11 publications

(13 citation statements)

References 5 publications

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“…Egy ehhez hasonló modellezési eljárást javasoltunk [1] "vegyes CAD eljárás" megnevezéssel. A megnevezés a merevtestkivonás módszerének relatív mozgásait és az utólagos CAD modellezési eljárások ötvözését igyekszik lefedni.…”

Section: Bevezetőunclassified

Relatív vágómozgásokkal generált pontfelhők szűrési nehézségei

Tolvaly-Roșca¹,

Forgó²

2017

MTK

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The Mixed Gear Modeling Method, developed by the authors, requires manipulation of large Points Clouds, situated in a spatial volume. Regular Points Cloud software's and manipulation techniques deals with points situated on surfaces, points obtained with scanning techniques. Generating points Clouds as in the developed methods cannot be manipulated with this usual techniques, therefore it is necessary to develop new techniques: filtering algorithm. The difficulties to develop a new approach consist in the spatial placement of the points, in the particular shape of the Clouds. As the generated points are partially concave and partially convex the usual software tools are not working properly with this kind of Points Clouds, raising some particular issues. The present paper shows some results from the earlier stage of the development, showing the difficulties raised during the application of different Points Cloud filtering algorithms.

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Section: Bevezetőunclassified

Relatív vágómozgásokkal generált pontfelhők szűrési nehézségei

Tolvaly-Roșca¹,

Forgó²

2017

MTK

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“…The virtual solid or surface models of gears [1,2,3,4,5,6,7,9], virtual gearing [8,9] or virtual manufacturing process studies of the gears [3] are the less expensive methods to develop and study new gearing solutions. Working in virtual environment needs specific models (solid, surface, assembly, FEA etc.)…”

Section: Introductionmentioning

confidence: 99%

“…The authors of the present paper have proposed a mixed CAD method to generate gears and other surface models, based also on the relative movement between the workpiece and the cutting tool [6,7]. A software was developed to realize various combination of circular and linear motions of the tool and workpiece gear, proper to simulate the complex movements of the real gear generating process.…”

Section: Introductionmentioning

confidence: 99%

“…Once the envelope surface is defined, the gear teeth can be built by using regular CAD procedures, NURBS surfaces and then solid models. As it was demonstrated in [6,7] the generating time compared to models using theoretical equations are much smaller, and only fractions of the generating time of a Solid Boolean generating process (second to minutes depending on simulation step precision). The main issue remains to find the envelope of this special points cloud, to validate the obtained final solid models visually and eventually with a comparative FEA analysis.…”

Section: Introductionmentioning

confidence: 99%

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Computing Algorithm for the Gear Tooth Space Points Cloud Envelope Generated by the Mixed Cad Method

Tolvaly-Roșca

Forgó

2017

MACRo 2015

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Abstract:The task of the mixed pure CAD generating method developed by the authors consists in finding only the points situated on the gear tooth surface. The use of the mixed CAD gear generating method results in a very large and particular type of Points Cloud: This contains points situated both in the tooth space, and on the tooth surface. The existing filtering programs and methods, as it was presented in previous papers, cannot deal with these particular point sets. The development of the named particular generating method claims an algorithm and a computer software which can find the envelope of the Points Cloud. This papers presents an Alpha Shape algorithm based filtering algorithm, adapted and developed to be used together with the mixed CAD generating software.

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“…For example, papers [5], [6], [7], [8] show the use of different discreet additive-or subtractive gear generating methods or the relative cutting motion of the generating edge to build up the necessary points clouds. The surfaces obtained with the method proposed by the authors of the present paper (under continuous development) [6,7], even if they are NURBS surfaces, present some inconsistencies but under controlled charge of error. The precision depends on the length of the finite linear motions and the value of the finite rotations characterizing the discreet generating process.…”

Section: Introductionmentioning

confidence: 99%

Comparative FEM Analysis of Gears Modeled With Analytical, Solid Subtracting and Mixed CAD Generating Method

Máté

2017

MACRo 2015

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Abstract:The paper proposes a comparative FEM analysis of gears solid model bodies, obtained with three different methods. The analytical method is based on the mathematical equations of the tooth flanks. It supposed to be the most accurate and precise solid modeling process. However, it reveals it's limits by handling of surfaces that are not deduced mathematically, or in case of tooth geometries which needs to be modified in order to perform a quick test regarding the probably effects of the mentioned modifications. The solid subtraction-and the newly developed, mixed CAD method are pure CAD generating methods. As any discrete generating method, their precision is influenced by the fineness of the iteration steps. In case of the mixed CAD solution the precision is influenced by the filtering algorithm applied to the generated Points Cloud. The visual comparison of the three mentioned methods, was presented in previously published papers. The present paper validates the novel mixed CAD method comparing the FEA analysis of the generated solid models.

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Mixed CAD Method to Develop Gear Surfaces Using the Relative Cutting Movements and NURBS Surfaces

Cited by 11 publications

References 5 publications

Relatív vágómozgásokkal generált pontfelhők szűrési nehézségei

Relatív vágómozgásokkal generált pontfelhők szűrési nehézségei

Computing Algorithm for the Gear Tooth Space Points Cloud Envelope Generated by the Mixed Cad Method

Comparative FEM Analysis of Gears Modeled With Analytical, Solid Subtracting and Mixed CAD Generating Method

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