A CAD integrated analysis of flatness in a form tolerance zone

Teck, Tan Book; Kumar, Abhishek; Subramanian, Vivekanandan

doi:10.1016/s0010-4485(00)00108-1

Cited by 9 publications

(6 citation statements)

References 7 publications

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“…Desrochers established a technologically and topologically related surface (TTRS), which represented three-dimensional parts as tree structure consisting of surfaces, and the tolerances information as tree nodes [5]. Teck et al used the small displacement torsor (SDT) to describe the small variation of the actual characteristic relative to the ideal characteristic for the planar feature, and proposed a new mathematical definition of the plane tolerance zone [6]. The tolerance zone was determined by calculating the range of the flatness parameter.…”

Section: Related Workmentioning

confidence: 99%

Geometric Errors and CAD Model Integration Method for Precision Assembly

Zhang

Zeng

Lou

et al. 2019

2019 25th International Conference on Automation and Computing (ICAC)

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It is difficult to integrate the complete geometric errors into the three-dimensional (3D) solid model in the present computer-aided design (CAD) system, which leads to the fact that virtual assembly technology based on the ideal CAD model cannot predict the influence of geometric errors on the assembly quality. The construction of the realistic geometric solid model is one of the key technologies to promote the practical application of virtual assembly technology. The dimension information and the geometric errors information of the parts are all expressed in the CAD model through the proposed integration method. The realistic geometric solid model is expressed by boundary representation (B-rep), and is reconstructed based on SAT file. C language programming is used to achieve the above functions. This method realizes the underlying data integration between the ideal CAD model and the geometric errors surface model, and improves the credibility of virtual assembly.

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Section: Related Workmentioning

confidence: 99%

Geometric Errors and CAD Model Integration Method for Precision Assembly

Zhang

Zeng

Lou

et al. 2019

2019 25th International Conference on Automation and Computing (ICAC)

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“…This has forced researchers to focus on a particular geometric tolerance or a few of them with certain common characteristics. For instance, Teck et al [17] developed a general method to define tolerance zones of form deviation using three parameters corresponding to the three degrees of freedom of a planar surface (one translation and two rotations). The method is not only limited to form deviations but also applied only to planar/flat surfaces.…”

Section: Tolerance Zonementioning

confidence: 99%

Current status and challenges of using geometric tolerance information in intelligent manufacturing systems

Lemu

2014

Adv. Manuf.

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Recent development in computer-based manufacturing and inspection has necessitated extended knowledge and usage of geometric tolerances as carriers of design intent. The aim of applying geometrical tolerances in design is to provide function-oriented precise description of part geometry where the conventional size tolerance system fails to address. In view of the current development of computer-aided systems, applying geometric tolerances opens a new research front. This article examines the challenges in applying geometric tolerance information to carry the design intent to other downstream manufacturing processes and intelligently integrate the whole system. Based on the observed practical capabilities and literature studies, it is concluded that the current computer-aided design (CAD) systems cannot effectively provide the appropriate use of geometric tolerances. This article highlights the existing challenges and proposes a scheme of algorithm development for appropriate use of tolerance symbols and conditions at the design specification stage. This, in the long run, enables the CAD model to carry the design intent and opens a window of opportunity for intelligently integrating manufacturing systems.

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“…Based on this data structure change, Chen and Ostrovskv presented the parametric tolerance algorithm in calculating tolerance zone for fixture design and planar mechanical parts [9,10]. To analyze location and orientation of the tolerance zone, Teck defined a flatness tolerance limit to verify fitting between parts in an assembly model [11].…”

Section: Reviewmentioning

confidence: 99%

Vector Based Datum Transformation Scheme for Computer Aided Measurement

Lai¹

2012

Computer-Aided Design and Applications

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Product geometry measurement is a critical step in the product development cycle. It provides dimensional and tolerance verification between mechanical design and measurement assuring the quality of the product. Traditional measuring strategy is based on experience rather than using a systematic approach. This paper presents a vector-based datum transformation scheme to standardize the method to define the measurement datum to improve the quality of mechanical parts. It is based on mating condition assembly models of CAD system, to identify the dimensional and tolerancing relation between a geometric feature and the measuring datum. Through Assembly Mating Map and tolerance analysis, a commonly measuring datum is defined to improve a measurement strategy with the same measuring vector of assembly features.

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A CAD integrated analysis of flatness in a form tolerance zone

Cited by 9 publications

References 7 publications

Geometric Errors and CAD Model Integration Method for Precision Assembly

Geometric Errors and CAD Model Integration Method for Precision Assembly

Current status and challenges of using geometric tolerance information in intelligent manufacturing systems

Vector Based Datum Transformation Scheme for Computer Aided Measurement

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