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- University
- Politecnico di Milano
- Degree programme
- Management Engineering
- Subject
- Industrial Technologies
- Material language
- English
- Classification
- Notes · Complete set
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NotesComplete setEnglish
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Complete course materials for Industrial Technologies in the Management Engineering degree programme at Politecnico di Milano. The document covers: INDUSTRIAL TECHNOLOGIES Sommario -INTRO DUCTIO N: .....................................................................................................................................................2 -IN T R O D U C T IO N T O P R O D U C T IO N S Y S T E M S :
Industrial TechnologiesComplete set
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Complete course materials for Industrial Technologies in the Management Engineering degree programme at Politecnico di Milano. The document covers: INDUSTRIAL TECHNOLOGIES Sommario -INTRO DUCTIO N: .....................................................................................................................................................2 -IN T R O D U C T IO N T O P R O D U C T IO N S Y S T E M S :
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INDUSTRIAL TECHNOLOGIES Sommario -INTRO DUCTIO N: .....................................................................................................................................................2 -IN T R O D U C T IO N T O P R O D U C T IO N S Y S T E M S : ......................................................................................................3 -P R O D U C T IO N A N D O T H E R S IN D U S T R IA L P R O C E S S E S : .................................................................................4 -H O W T O D E F IN E A P R O D U C T IO N S Y S T E M : ......................................................................................................5 -B A S IC S , P E R F O R M A N C E S A N D C O S T S : .......................................................................................................... 19 -H O W P R O D U C T IO N S Y S T E M S W O R K : .......................................................................................................... 19 A T T E N Z IO N E A T IM E /Q U A N T IT Y A N D Q U A N T IT Y /T IM E ..................................................................................... 22 -IN T R O T O T H E D E S IG N O F P R O D U C T IO N S Y S T E M S : ......................................................................................... 25 -JOB SHOP: ............................................................................................................................................................ 27 -STRENGTHS:..................................................................................................................................................... 29 -W EAKNESSES:…
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num ber of hours available for each m achine type i: · Number of hours that we want to work, hours available. ·· SE: scheduling efficiency, reducing the number of hours available to simulate a man confused, planning is not perfect and there will be loses of time due to effort of scheduling. S TE P 7 – N um ber of m achines: w e need to calculate the num ber of m achines of type i necessary to manufacture the production mix, given yearly demand: needed -number of hours of production it's & shift (Easion open and - -> more we stay S . are work less racuve , nooded In exam 1.5 is 2, but in real life it depends on many things, like the costs, so we will have to analyze the financial part of it. This is a workload model based on a deterministic system, no variance in our calculation, stationary and fixed. We can add stochastic part with others. 7. S TE P 8 – N um ber rounded: w e need to round the num ber depending on m achine costs, outsourcing possibility and alternative routings. Number of shifts, yearly costs adopting 1/2/3 shifts/day: If I w ant to find the rate of saturation of a departm ent I have to: NMi rate of saturation of i= NM real I put up the number of machine from the formula, and down the number of machines rounded up as usual to do in exercises, so I can find the rate of saturation. -MANUFACTURING CELLS: This is the second type of parts production in manufacturing plants. This type of configuration is almost the most used in Japanese approach like in Toyota, also called lean cells. Again, we have seen toys of wood, we can recognize that there are different shapes and colors, but many of them has only small differences such as the heights but same paintings and shape, only different cut. We can notice that all the pieces are like others, 2 main families of…
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Also, in determining the assembly times of manual assembly we must consider the “Learning curve” that affects the work time due to operator’s learning effect. -FIXED POSITION ASSEMBLY: the product is assembled in a single site, rather than being moved through a set of assembly stations, so materials, equipment, tools are brought to the site. Typically, we choose this system to assembly heavy and bulky machines, simple products or fragile products. Not only 1 operator for each site! W e m ust store com ponents around the site, assem bly equipm ent and tools as w ell. Operations space where we have all the tools and components needed for doing this product by operators. Example: Example also of mounting a door, where there is also a kind of machine for doing some activities and others are done by operators. Strengths: • H igh flexibility: w e can do changing in products and size is very flexible, so we have mix flexibility, product flexibility and expansion flexibility. • Low investment: compared to assembly lines, they don’t require particular structures. • Job enlargement, enrichment and rotation for the employee:
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Here we WC_m that is the mean of the work content, obviously a weighted average due to different product mix and quantities. The WC_s gives us the standard deviation of the WC, for big numbers we can use divided n. Maybe could be helpful to determine the coefficient of variation when comparing the variability of different distributions: Also, from this w e can find the m inim um W IP in hours: -PERFORMANCE MEASURES: for each workstation an operation time TOP can be calculated, it expresses the time needed in order to complete the job (production order or campaign) measured in the shop calendar days SCD.
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Also, normally in exercises we have a target production where we calculate q that is the production in ton/h needed, then we have ton/h theoretical, after we calculate ton/h APC, so we can divide q/APC in ton/h to understand the number of lines needed, then we round it up and we calculate as usual the saturation. We can have 2 cases (Example of 5.3): • 5 m achines full and 1 less using: q∗¿ q− APC∗(6−1) q∗¿ sat∗¿ ¿ and we know the saturation of that line APC • 6 m achines at 89% of saturation
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