3a. Factory Automation redesign - MECH_3135_redesign_to_students

The threshold value is 25 functional analysis is

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Unformatted text preview: utomation MECH 3135 FITTING Analysis: The types of gripping, insertion and fixing operations required are identified, each operation is rated and the whole assembly task gets a fitting ratio. The threshold value is 2.5. Functional Analysis is carried out in four stages: Stage 1 : Determine the functional requirements of the product Stage 2: Decide whether the product can be considered as a whole or as a series of functional sub sections. Best to consider the product as a whole and avoid duplication of features in adjacent parts. Stage 3: Components are divided into 2 categories. Components A: they carry out functions vital to the performance of the product e.g. shaft, adjusting screws Components B: their purposes is not critical to the product e.g. locators, fasteners Select a major functional element to start the point of the analysis. Reference : Lucas Engineering and Systems Page 13 of 22 S. Venkannah Factory Automation MECH 3135 Stage 4: Categorise mating components in a logical progression using the questioning routine in the Functional criteria chart. Functional Assessment given in terms of a design efficiency (E): E= no. of A components x 100 Total number of components E must be as high as possible but a threshold of 60% is suggested. Functional Analysis: 1. It may be possible to obtain the required movement by flexing the component 2. in some cases, the same material may have different functional properties and therefore must remain a separate part 3. a requirememnt for a different material may be for insulation, wear resistance, vibration and damping 4. the part and its mating part could be made of the same material or it may be treated locally to provide the required property. Reference : Lucas Engineering and Systems Page 14 of 22 S. Venkannah Factory Automation MECH 3135 5. can the part be deformed to give the desired dimension RULE: Assess what is, not what should be. • The analysis will help to determine the components necessary for the functioning of the product (A) and to highlight the theoretically non essential ones (B). If there are doubts, make the component “B” • Parts rated as A may no longer be required in the redesign • Parts rated as B may still remain in the redesign for aesthetic or legislative reasons • Careful when rating screws and springs as all similar components may not perform the same function. • There may be good economic reasons for using separate components when in theory they may be combined AUTOMATED FEEDING ANALYSIS: A feeding ratio is obtained from a three stage analysis: Reference : Lucas Engineering and Systems Page 15 of 22 S. Venkannah Factory Automation MECH 3135 Stage 1 : Determine whether components are best transported in a retained orientation or from bulk supply and then re orientated at the input point. Stage 2: Assess the general physical properties for automatic feeding of those components that will not be transported with the retained orientation. Stage 3 : Examine the suitability of the detailed design of those components proposed for automatic feeding A total relative cost can...
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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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