Process capability analysis for a multi-process product

Chen, Kuen‐Suan; Hsu, Chin-Hsien; Wu, Chin-Chuan

doi:10.1007/s00170-004-2312-3

Cited by 17 publications

(8 citation statements)

References 14 publications

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“…If the performance of the process is in control, and therefore predictable, the ability of the process to manufacture products that are 'in specification' can be reliably assessed and the number of products or parts that will be 'out of specification' can be predicted. Capability is determined by comparing the process spread with the specification spread [17,18]. In other words, the width of the process variation is compared with the width of the specification interval.…”

Section: Process Capability Analysismentioning

confidence: 99%

“…1). With the advance of statistical quality control theory [16][17][18][19], it is now possible to define the process capability, in engineering terms, that relates the defined quality characteristics of the product to its specification requirement in an effort to ensure the production of quality-consistent products (Fig. 2).…”

Section: Introductionmentioning

confidence: 99%

“…The process capability analysis approaches [17,18] employed in the process design have been successfully applied in other industry sectors, such as the electronics and medical device industries, since the early 1980s [16,[20][21][22]. The application of these approaches to gain a better understanding of process variation and control is important if emerging small-and medium-sized enterprises and the more established larger companies are to develop the efficient manufacturing processes that will enable them to survive in an increasingly competitive market [20].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the process capability of the solid free-form fabrication: A case study of scaffold moulds for tissue engineering

Liu

Han

Hourd

et al. 2008

Proc Inst Mech Eng H

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This study applies the methodology and procedure of process capability to investigate a solid free-form fabrication technique as a manufacturing method to produce scaffold moulds for tissue engineering. The process capability Cpk and process performance Ppk of scaffold mould manufacture using a solid free-form fabrication technique has been analysed with respect to the dimension deviations. A solid free-form fabrication machine T66 was used to fabricate scaffold moulds in this study and is able to create features that ranged from 200 microm to 1000 microm. The analysis showed that the printing process under the normal cooling conditions of the printing chamber was in statistical control but gave low process capability indices, indicating that the process was 'inadequate' for production of 'dimension-consistent' scaffold moulds. The study demonstrates that, by lowering the temperature of the cooling conditions, the capability Cpk of the printing process can be improved (about threefold) sufficiently to ensure the consistent production of scaffold moulds with dimension characteristics within their specification limits.

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Section: Process Capability Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On the process capability of the solid free-form fabrication: A case study of scaffold moulds for tissue engineering

Liu

Han

Hourd

et al. 2008

Proc Inst Mech Eng H

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“…Additionally, a few studies focus on multivariate non-normal process capabilities. The number of such studies increases yearly [3,11,25,27,44,[51][52][53][54][55][56][57][58][59].…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation Using Multivariate Non-Normal Process Capability

2019

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Process capability indices (PCIs) have always been used to improve the quality of products and services. Traditional PCIs are based on the assumption that the data obtained from the quality characteristic (QC) under consideration are normally distributed. However, most data on manufacturing processes violate this assumption. Furthermore, the products and services of the manufacturing industry usually have more than one QC; these QCs are functionally correlated and, thus, should be evaluated together to evaluate the overall quality of a product. This study investigates and extends the existing multivariate non-normal PCIs. First, a multivariate non-normal PCI model from the literature is modeled and validated. An algorithm to generate non-normal multivariate data with the desired correlations is also modeled. Then, this model is extended using two different approaches that depend on the well-known Box–Cox and Johnson transformations. The skewness reduction is further improved by applying heuristics algorithms. These two approaches outperform the investigated model from the literature because they can provide more precise results regardless of the skewness type. The comparison is made based on the generated data and a case study from the literature.

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“…Al 4 C 3 phases are found to form when pure C is added to Al base alloys or due to dissociation of carbides (SiC and WC). [10][11][12] One of the reaction routes is…”

Section: Introductionmentioning

confidence: 99%

TiC reinforced composite layer formation on Al–Si alloy by laser processing

Viswanathan

Sastikumar

Kamachimudali

et al. 2007

Surface Engineering

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Al-Si alloy was laser surface treated with various compositions of TiC and Ni under different laser processing parameters to produce a TiC reinforced composite layer on it. The study shows that TiC composite layer is formed when the composition is 75TiC-25Ni (wt-%) and laser power 2 . 5 kW and scan speed 0 . 2 m min 21 . The layer exhibited an average microhardness of y750 HV, which is free from pores as well as cracks and contained TiC and Al-Si phases distributed in the Ni-Al matrix. Mechanical strength of layer is studied by the hardness test.

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Process capability analysis for a multi-process product

Cited by 17 publications

References 14 publications

On the process capability of the solid free-form fabrication: A case study of scaffold moulds for tissue engineering

On the process capability of the solid free-form fabrication: A case study of scaffold moulds for tissue engineering

Performance Evaluation Using Multivariate Non-Normal Process Capability

TiC reinforced composite layer formation on Al–Si alloy by laser processing

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