The study of cost-tolerance model by incorporating process capability index into product lifecycle cost

Hsieh, Kun-Lin

doi:10.1007/s00170-004-2385-z

Cited by 36 publications

(17 citation statements)

References 13 publications

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“…This idea was outlined by Pike [11] and is present or mentioned in more recent works like Sfantsikopoulos [12], Diplaris [14] or Hsieh [15], but with a different approach. This idea was outlined by Pike [11] and is present or mentioned in more recent works like Sfantsikopoulos [12], Diplaris [14] or Hsieh [15], but with a different approach.…”

Section: Models Intercomparisonmentioning

confidence: 99%

Comparative Research among Cost-Tolerance Models Used in Mechanical Manufacturing

Lobera¹,

López²,

Perez³

et al. 2009

AIP Conference Proceedings

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Present paper collects significant works about cost-tolerance curves. Although the cost-tolerance binomial has a great relevance in mechanical manufacturing processes, getting an adequate relationship between cost and tolerance is still an unsolved problem. Collected works in this paper cover the main attempts to find a satisfactory solution from first developments to nowadays. The paper analyzes the features of each model and presents them using a uniform format in order to establish a comparison among them. Fortresses and weaknesses of each model are emphasized. From comparison results, a new approach to cost-tolerance curves is suggested. This approach is built from manufacturing process instead of extemal data like occurs in most of revised works.

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Section: Models Intercomparisonmentioning

confidence: 99%

Comparative Research among Cost-Tolerance Models Used in Mechanical Manufacturing

Lobera¹,

López²,

Perez³

et al. 2009

AIP Conference Proceedings

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show abstract

“…Process coordinate tolerances must observe, on the other hand, the design (original) dimensional tolerances, in conformance with the tolerance transfer principle Diplaris 1991, Sfantsikopoulos 1997). Given that tighter tolerances always lead to an exponential increase of the machining cost (Spotts 1973, Ehrlenspiel 1985, Sfantsikopoulos 1990, British Standards Institution 1995, Yeo et al 1996, Zhang 1997, Kulkarni and Bao 2003, Hu and Xiong 2005, various methods for cost optimum allocation of process tolerances that can be achieved with minimum manufacturing cost, within the machine shop accuracy-getting capabilities, have been proposed , Zhang 1997, Li et al 2000, Gao and Huang 2003, Huang et al 2005, Singh et al 2005, Hsieh 2006, Kumaravel et al 2007. To model the objective function of the optimization problem, a cost-tolerance function is required for each process tolerance.…”

Section: Introductionmentioning

confidence: 99%

Tolerance elements: an alternative approach for cost optimum tolerance transfer

Dimitrellou

Diplaris

Sfantsikopoulos

2008

Journal of Engineering Design

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This paper presents a method for cost optimum conversion of functional tolerances into machining tolerances transferred to one or more datum reference frames. A new concept-that of the Tolerance Element-is introduced as a machining process-related geometric entity with attributes associated with the accuracy cost. The accuracy-getting capabilities and cost per Tolerance Element are recorded for a particular machine shop through an appropriately designed database feedback form. The Tolerance Elements methodology, once adapted for this machine shop through processing information of the database feedback form, automatically creates application-focused cost-tolerance functions. The latter, in conjunction with the tolerance transfer principle and the machining axes accuracies, are used for the formulation of the problem objective function for cost optimum tolerancing. The system database needs expert updating only when changes occur in the machine shop facilities and/or expertise. The proposed method is demonstrated and discussed by means of an application example.

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“…The tolerance levels are commonly set during the product development phase where a certain level is determined in relation to what is required of the part in order to function properly in the designated product and fulfill customer demands. It is important to note that the required tolerance level strongly influences the production process, and as a result the production cost, as emphasized by Hsieh [1]. Typically the production cost could be expected to increase substantially as a function of decreasing tolerances as shown by Yeo et al [2].…”

Section: Introductionmentioning

confidence: 99%

Modeling the cost of varying surface finish demands during longitudinal turning operations

Schultheiss

Hägglund²,

Ståhl

2015

Int J Adv Manuf Technol

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Tolerances, including geometry, dimension, and surface roughness, are an important part of production where the desire to manufacture quality products have to be weighed against the increase of manufacturing costs. The desired tolerance will influence the choice of both manufacturing method and machine tool. Given that machining is an adequate production method, variation of the required tolerances will imply a variation of the part cost which needs to be taken into account during production planning. Thus, the term "tolerance cost" is introduced. The paper presents a model for evaluating the tolerance cost in respect to the surface roughness during longitudinal turning operations, enabling a better comparison between different production alternatives. Through knowledge of the required surface roughness, it is possible to estimate appropriate cutting conditions. Knowledge of the cutting conditions and the part geometry then makes it possible to calculate the cycle time, information which in turn may be used for calculating the corresponding part cost. Through using experimental data, it is proven that the required surface roughness has a significant influence on the attained manufacturing cost. For instance, while longitudinally turning AISI 4140, it was shown that an improvement of the surface roughness from R a =3.2 μm to R a =1.6 μm will entail an increase of the part cost by roughly 20 %. Similarly, a decrease of the required surface quality (larger R a value) will imply a significantly reduced part cost.

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The study of cost-tolerance model by incorporating process capability index into product lifecycle cost

Cited by 36 publications

References 13 publications

Comparative Research among Cost-Tolerance Models Used in Mechanical Manufacturing

Comparative Research among Cost-Tolerance Models Used in Mechanical Manufacturing

Tolerance elements: an alternative approach for cost optimum tolerance transfer

Modeling the cost of varying surface finish demands during longitudinal turning operations

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