TVCAPP, tolerance verification in computer-aided process planning

Abdou, G.; Cheng, Rui Qi

doi:10.1080/00207549308956732

Cited by 24 publications

(9 citation statements)

References 5 publications

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“…Chart in design can be called design tolerance chart (DTC), and chart in process planning can be called process tolerance chart (PTC). The latter has been covered in various literature since the 1950s (Gadzala 1959, Wade 1967, Nicks 1982, Wade 1983, Curtis 1988, Ahluwalia and Karolin 1986, Fainguelernt et al 1986, Irani et al 1989, Whybrew et al 1990, Mittal et al 1990, Abdou et al 1993, Ji 1993, 1995, Ngoi et al 1993, 1994, Britton et al 1997, Krag 1997. Those references, from US sources as well as from outside USA, are not a complete list; but they are the major ones in the subject area.…”

Section: Process Tolerance Chartsmentioning

confidence: 98%

Automatic generation of min/max tolerance charts for tolerance analysis from CAD models

Shen¹,

Shah

Davidson

2008

International Journal of Computer Integrated Manufacturing

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The so-called min/max tolerance charts are popular for analysing tolerance accumulation in parts and assemblies, despite the fact that this method is limited to one-dimensional worst-case analysis. Since different chart construction rules apply to different tolerance classes, the user has to remember all the different rules to construct a valid tolerance chart. Constructing the charts manually, as is common practice in industry today, is time-consuming and error-prone. This paper presents procedures for automating tolerance charting. It requires a computer aided design (CAD) model with GD&T specifications as input. The automation is based on a data model called the constraint-feature-tolerance (CTF) graph and machine interpretable representation of charting rules specific to each tolerance class. This paper also presents procedures for automatically extracting dimension and tolerance stacks for any user defined analysis dimension, and automatic part arrangement in assemblies corresponding to worst case analyses. Important implementation issues are also discussed and several case studies are presented, the results of which have been verified by manual chart construction.

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Section: Process Tolerance Chartsmentioning

confidence: 98%

Automatic generation of min/max tolerance charts for tolerance analysis from CAD models

Shen¹,

Shah

Davidson

2008

International Journal of Computer Integrated Manufacturing

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“…The problem has been treated in a number of publications (see, for example, Gadzala 1959, Eary and Johnson 1962, Wade 1967, 1983, Ahluwalia and Karolin 1986, Fainguelernt et al 1986, He 1991, Irani et al 1989, Ngoi 1992, Zhang and Wang 1992, Abdou and Cheng 1993, Ngoi and Ong 1993, Ngoi and Fang 1994, and is also related to the tolerance allocation (synthesis) problem in design, which has also been treated extensively in the literature, both deterministically and stochastically (see Mansour 1963, Moy 1964, Gladman 1966, Peters 1970, Bennett and Gupta 1970a, 1970b, Speckhart 1972, Spotts 1972, 1975, Wilde and Prentice 1975, Wilde 1975, Ostwald and Huang 1977, Bjorke 1978, Michael and Siddall 1981, 1982, Monte and Datseris 1982, Parkinson 1982, 1984, 1985, Balling et al 1986, Lee and Woo 1989, Lee and Johnson. 1993, Balakrishnan 1993, Varghese et al 1996.…”

Section: Introductionmentioning

confidence: 99%

An implicit enumeration approach to probabilistic tolerance allocation under conventional tolerance control

Wheeler¹,

Cavalier

Lehtihet

1999

International Journal of Production Research

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The accuracy and precision of a manufactured dimension is largely dependent on the accuracy and precision of the technological processes selected for its execution. It is not unusual to have available several competing technological processes for execution of each manufacturing operation speci® ed in a process plan, where it is generally assumed that, as the precision of the technological process improves, the associated cost and yield of the operation increase. This paper presents an implicit enumeration approach to the selection of an optimum subset of technological processes required to execute a process plan under a conventional tolerance control strategy. A probabilistic approach to the problem is presented and the First Order Second Moment Method (FOSMM) is used to estimate yield for an interdependent system of functional requirements.

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“…AUTAP [6], EXCAP [7], XPLAN [8], Turbo-CAPP [9], SIPP [10], KAPPS [11], KAPLAN [12], QTC [13], GEN-PLAN [14], and TVCAPP [15] are some representative examples of generative CAPP systems. In spite of enormous efforts, a general generative CAPP system has not been accomplished yet.…”

Section: Introductionmentioning

confidence: 99%

“…15 Polishing and benching * NP: number of passes; DC: depth of cut (mm); CS: cutting speed (m/min); RS: rotate speed (r/min); FR: feed rate (turning: mm/rev or milling: mm/min)…”

mentioning

confidence: 99%

Parametric process planning based on feature parameters of parts

Chen

Huang

Chen

et al. 2005

Int J Adv Manuf Technol

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This paper presents a model parametric process plan that is dependent on feature parameters of parts, and proposes a solution for the automated process planning of part families. Based on the parametric process plan templates for part families and the feature parameters of new parts, a prototype system is developed. First, parts are grouped into families considering their geometric or manufacturing similarities, and the parametric process plan template is pre-created for each family. Then, to plan the process of a new part, the system extracts feature parameters from its feature-based model and generates an a parametric process plan by searching the template library and solving related constraints. Finally, the system outputs the process plan sheets, if necessary. Although the system cannot creatively generate process plans for brand new parts, the system can meet two important requirements of the real industrial world to CAPP systems, that is good system performance and rapid response.

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TVCAPP, tolerance verification in computer-aided process planning

Cited by 24 publications

References 5 publications

Automatic generation of min/max tolerance charts for tolerance analysis from CAD models

Automatic generation of min/max tolerance charts for tolerance analysis from CAD models

An implicit enumeration approach to probabilistic tolerance allocation under conventional tolerance control

Parametric process planning based on feature parameters of parts

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