3a. Factory Automation redesign - MECH_3135_redesign_to_students

Venkannah factory automation mech 3135 the indices

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Unformatted text preview: will be relatively minor. DFA Evaluation Procedure Every part must be included in the analysis such as labels, protective caps. Reference : Lucas Engineering and Systems Page 19 of 22 S. Venkannah Factory Automation MECH 3135 The indices must be used in context with the company resources and experience Where large number of components are involved, it may be convenient to sub divide the analysis into sub assemblies. Care must then be taken during Functional analysis as component in one sub assembly may also be required in other sub assemblies. The Step by Step Approach. 1. Understand the product design specification Opportunities for automation Product family potential Investment constraints 2. identify every part by number and name 3. start with a major functional item and work outwards through the mechanical interfaces to assign every part a functional category 4. calculate design efficiency, then ; if the product exists continue to 5 if the product is new but > 60% continue to 5 if the design is new and the efficiency is less than 60% redesign the product before continuing Reference : Lucas Engineering and Systems Page 20 of 22 S. Venkannah Factory Automation MECH 3135 5. Determine the likely feeding method for every part and assign an appropriate index 6. Draw the assembly sequence flowchart 7. Determine the gripping index for automated assembly 8. Allocate fitting indices 9. Allocate non assembly process indices 10. Identify areas for attention i. Design efficiency < 60% ii. Handling indices >1 iii. Auto feeding indices >1.5 iv. (∑feeding indices /A parts) >2.5 v. Gripping indices > 0 vi. Fitting indices >1.5 vii. (∑fitting indices /A parts) >2.5 11. Redesign using prompts from 10 12. Re-evaluate new design. ASSEMBLY COSTS: Cost of Assembly (C) ∝ Cp/Nt + Ca/Na + Cm Now Cp ∝ Np∑(Cf + Cg+ Ci + Cfx) Where: Cp- Te total capital cost of the assembly system Reference : Lucas Engineering and Systems Page 21 of 22 S. Venkannah Factory Automation MECH 3135 Nt – the total number of assemblies produced during the life of the system Np – The number of parts in the Assembly Ca- the annual cost of operating the system Na – The annual production of the system Cm – cost of labor per assembly Cf – the feeding cost of an individual part Cg- the gripping cost of an individual part or sub assembly Ci – the insertion cost of an individual part or sub assembly Cfx- the cost of any fixing operation Reference : Lucas Engineering and Systems Page 22 of 22...
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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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