Combining tolerance design and monitoring process capability in a design-manufacturing integration procedure

Abstract

Traditionally, tolerance design and process capability control for new product development belong to the design and manufacturing stages respectively. In fact, they determine the finished product's cost, function, and quality, and should be considered concurrently. This paper provides a design—manufacturing integration procedure to enhance the efficiency of new product development. The procedure includes a total cost analysis, process capability indices, and an altered I_x - I_y monitoring chart. In particular, the process capability indices are considered in the total cost function in order to establish the relationship between quality variability and tolerance design. The use of this procedure should help designers to determine the optimum tolerance when considering not only the total cost but also the level of process capability that a manufacturer can supply. Similarly, it also can help manufacturers to simply and accurately indicate the status of their production in meeting the required tolerance levels. Finally, the proposed procedure is applied to an assembly study to illustrate how the proposed procedure can be employed in practice.

Keywords

tolerance design design—manufacturing integration process capability index

References

Liker

J. K.

Collins

P. D.

Hull

F. M.

, ‘Flexibility and standardization: Test of a contingency procedure of product design-manufacturing integration’ J. Prod. Innov. Mgmt 16 (3) (1999): 248–267.

Monsen

W. H.

Ettlie

J. E.

Stoll

H. W.

, ‘Early manufacturing involvement (EMI)’ Managing the design-manufacturing process (McGraw-Hill 1990): Pp. 187–199.

Jassawalla

A. R.

Sashottal

H. C.

, ‘Cross-functional dynamics in new product development’ Res.-Technol. Mgmt 43 (1) (2000): 46–49.

Jeang

, ‘An approach of tolerance design for quality improvement and cost reduction’ Intl J. Prod. Res. 35 (5) (1997): 1193–1211.

Jeang

, ‘Optimum tolerance design for product life cycle’ Int. J. Prod. Res. 34 (8) (1996): 2187–2209.

Huang

M. F.

Zhong

Y. R.

Z. G.

, ‘Concurrent process tolerance design based on minimum product manufacturing cost and quality loss’ Int. J. Adv. Mfg Technol. 25 (2005): 714–722.

Lee

Y.-C.

Wei

C.-C.

, ‘Process capability-based tolerance design to minimize manufacturing loss’ Int. J. Adv. Mfg Technol. 14 (2005): 33–37.

Irani

S. A.

Mittal

R. O.

Lehtihet

E. A.

, ‘Tolerance chart optimization’ Int. J. Prod. Res. 9 (1989): 1931–1952.

Nagarwala

M. Y.

Pulat

P. S.

Raman

, ‘A slope-based method for least cost tolerance allocation’ Concurr. Engng 3 (4) (1995): 319–328.

10.

Wei

C. C.

Lee

Y. C.

, ‘Determining the process tolerances based on the manufacturing process capability’ Int. J. Adv. Mfg Technol. 6 (1995): 416–421.

11.

Swift

K. G.

Raines

Booker

J. D.

, ‘Tolerance optimization in assembly stacks based on capable design’ Proc. IMechE, Part B: J. Engineering Manufacture 213(B7) (1999) 677–693 DOI: 10.1243/0954405991517119.

12.

Huang

M. F.

Gao

Y. S.

, ‘An optimal tolerancing approach based on the minimum manufacturing cost’ J. Huazhong Univ. Sci. Technol. (China) 30 (2002): 19–21.

13.

Phadke

M. S.

, Quality engineering using robust design (New York: Prentice-Hall 1989).

14.

Hsieh

K.-L.

, ‘The study of cost-tolerance procedure by incorporating process capability index into product lifecycle cost’ Int. J. Adv. Mfg Technol. 28 (2006): 638–642.

15.

Chase

Green

, ‘Design issues in mechanical tolerance analysis’ Mfg Rev. 1 (1) (1988): 50–59.

16.

Jeang

, ‘Tolerance design: Choosing optimal tolerance specification in the design machined parts’ Qual. Reliab. Engng Int. 10 (1994): 27–35.

17.

Montgomery

D. C.

, Introduction to statistical quality control Fourth edition, (New York: Wiley 2001).

18.

Kotz

Johnson

N. L.

, Process capability indices (London: Chapman and Hall 1993).

19.

Pearn

W. L.

Kotz

Johnson

N. L.

, ‘Distributional and inferential properties of process capability indices’ J. Qual. Technol. 24 (1992): 216–231.

20.

Chen

K. S.

K. T.

Sheu

S. H.

, ‘Process capability monitoring chart with an application in the silicon-filler manufacturing process’ Int. J. Prod. Econ. 103 (2006): 565–571.

21.

Vännman

Deleryd

, ‘Process capability plots—a quality improvement tool’ Qual. Reliab. Engng Int. 15 (1999): 213–227.

22.

Pearn

W. L.

Shu

M. H.

Hsu

B. M.

, ‘C_pm MPPAC for manufacturing quality control applied to precision voltage reference process’ Int. J. Adv. Mfg Technol. 23 (2004): 712–719.

23.

Srinivasan

O'Conner

M. A.

, ‘On interpreting statistical tolerance’ Mfg Rev. 4 (1994): 304–311.