3a. Factory Automation redesign - MECH_3135_redesign_to_students

3a Factory Automation redesign MECH_3135_redesign_to_students

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Unformatted text preview: be obtained by summing all the individual feeding indices Feeding ratio = Total relative feeding cost / Number of A Parts The aim is to minimize this factor and an acceptable limit is 2.5 FITTING ANALYSIS (FA) : The proposed sequence of assembly must be known. An assembly flowchart must be prepared to indicate the order in which each part is gripped, assembled to its mating components and where Reference : Lucas Engineering and Systems Page 16 of 22 S. Venkannah Factory Automation MECH 3135 necessary fixed in position to produce the completed assembly. FA made up of 3 sections: Gripping Insertion and Fixing Gripping Analysis examines the ease with which each part can be held for transportation from the point of presentation within the automatic assembly system to the stage where insertion is complete. Each component is examined for its suitability for gripping and assigned the appropriate gripping index. Components where handling is straightforward receive a low gripping index. Fitting Analysis assesses the relative ease or difficulty of carrying out each assembly task required to assemble the complete product from its constituent parts. Each fitting process is allocated a relative cost index. Individual index values of ≥ 1.5 infer the presence of a fitting problem. Reference : Lucas Engineering and Systems Page 17 of 22 S. Venkannah Factory Automation MECH 3135 NON ASSEMBLY ANALYSIS: a relative cost index for non assembly process is allocated. E.g. of such processes are welding, adhesive bonding, setting, testing, measuring, placement into a work holder. FITTING ASSESSMENT: A total relative cost can be obtained by summing the individual fitting indices. Fitting ratio = Gripping costs + Fitting process costs + Non assembly costs Number of parts The aim is to minimize the above ratio but for an acceptable design the fitting ratio must generally be <2.5 REDESIGN : After product/s have been fully analyzed certain aspects of the design, component feeding and assembly will be highlighted as being out of recommended limits. DESIGN Efficiency: Examine all parts which have been designated as “B” and try to eliminate them or combine Reference : Lucas Engineering and Systems Page 18 of 22 S. Venkannah Factory Automation MECH 3135 them with an “A” component. May help bring out novel design concepts. FEEDING of Components: While bringing about a design concept to satisfy the required design efficiency rating, consider suitability of the component part design for handling and feeding. Usually simple changes in the design of those parts presenting feeding problems will eradicate the problems without compromising the component function. PRODUCT ASSEMBLY. Components resulting from the redesign must provide with suitable gripping surfaces. The product redesign stage must consider the task of actually assembling the parts into their final position. If this is done, changes to the component to reduce high fitting ratio...
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This document was uploaded on 03/12/2014 for the course MECHANICAL 214 at University of Manchester.

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