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2 Archives of Mechanical Technology and Automation

2 2012

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Results of assembly process time consumption measurements using the ChronFoto_RC method

Żurek J., Cieślak R., Suszyński M.

Archives of Mechanical Technology and Automation

2012

Vol. 32, no. 2

61-68

This paper presents a computer-based implementation of the ChronFoto_RC method of time consumption measurements on the basis of a selected test task. The article substantiates the subject and discusses the essence of research in time consumed by assembly processes. The article presents the characteristics of the ChronFoto_RC method, which is based on a combination of a time study module and a working day's activity study module. The article presents assumptions responsible for effectiveness of research into time consumed by assembly processes. The following parts of the article present the main stages of application of the ChronFoto_RC method. The presented results of time consumption research using the ChronFoto_RC method refer to assembling a mechanical part of a machining centre made up of six operations, i.e. installing a bed, a Y slide, a headstock housing, a rest, a turntable on the bed and a headstock slide. This paper presents principal elements of ChronFoto_RC software, i.e. measurements sheet ZE2, an allowance sheet, a diagram sheet and sheet Z2 as well as conclusions regarding investigated research and analysis.

W artykule omówiono istotę badania czasochłonności procesów technologicznych montażu i scharakteryzowano metodę ChronFoto_RC, opartą na połączeniu modułów chronometrażu i fotografii dnia roboczego. Podano założenia decydujące o efektywności takich badań. Wyniki badania czasochłonności metodą ChronFoto_RC podano dla procesu technologicznego montażu części mechanicznej centrum obróbkowego składającego się z sześciu operacji, tj. montażu łoża, sań Y, korpusu wrzeciennika, stojaka, stołu do łoża oraz sań korpusu wrzeciennika. Zamieszczono podstawowe elementy programu komputerowego ChronFoto_RC, tzn. arkusza pomiarowego ZE2, dodatku, wykresu i arkusza Z2 oraz wnioski z badań i analiz.

Practical evaluation of methods of research in assembly time consumption

Żurek J., Cieślak R, Suszyński M.

Archives of Mechanical Technology and Automation

2012

Vol. 32, no. 4

43--53

This paper evaluates, considering a practical perspective, the methods of research in times of assembly processes performed by workers i.e. time study, working day's activity study, MTM, MOST and Work-Factor during assembly of a milling machine spindle in JAFO S.A. factory. This research is substantiated and methods of research in time of assembly processes arc discussed. A review of presented methods is made and their strengths and weaknesses are discussed. The article presents results of studies in assembly time of a CNC milling machine spindle using five time observation methodologies. The operation under consideration is divided into seven stages. On the basis of the literature and authors' research a practical evaluation is made considering methods of measuring time consumed by assembly of a spindle of a CNC milling machine. Principles of selecting appropriate methods for specific situations in industrial practice are discussed.