Design of Process
Transcript of Design of Process
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Operations ManagementOperations Management
1 Design
2 Operation control
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Design IssuesDesign Issues
Focus on configuration aspects of an operating system. Product Development Choice of technology and processes for manufacturing Overall capacity that needs to be built into the system Type and number of resources to have Layout of the machines and overall strategy and policy for quality, cost and
operational procedures.
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Operational Control IssuesOperational Control Issues
Focus on how the existing operating system could be put to the best use and how several short term requirements placed on the system could be addressed more efficiently.
Demand Forecasting Production planning and scheduling Quality control Maintenance management Supply chain management
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Design of ProcessDesign of Process
It focuses on various choices we make with respect to the flow of parts in a manufacturing system.
• At a detailed level , it is a planning process for each and every component manufactured that determines number of steps involved in manufacturing, the number and type of steps used and the time spent in each of these steps.
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Determinants of Process Characteristics in OperationsDeterminants of Process Characteristics in Operations
Volume
Variety
Flow
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In general Volume and variety seem to have an inverse relationship.
Volume and variety influences the flow pattern in a manufacturing system
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Types of processes and Operations SystemsTypes of processes and Operations Systems
Continuous Flow System
Intermittent Flow System
Jumbled Flow System
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Continuous Flow SystemContinuous Flow System
Streamlined flow of products in the operating system.
Production process is sequential and the required resources are arranged in stages.
Characterized by technological constraints (Process Industries) and high volume of activities (Mass Production).
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Process IndustriesProcess Industries
Logs and chips of wood stored Crushing of
Logs and chips
Processing of the wood
Cleaning and bleaching
Refining the wood pulp
Drying the wood pulp
Stretching the Paper rolling
Cutting Final packing
Preparatory
Pulp Making
Paper Making
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Capacity balancing is very important
Process industry firms invest more time on developing good maintenance practices.
Very little WIP inventory
Huge benefits from the vertical integration of the operations and adding several secondary conversion facilities.
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Mass ProductionMass Production
Product line structure (Product layout)
At the overall level, each product will flow across departments in a streamlined fashion.
Within each department , there will be orderly flow of components and materials.
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Intermittent FlowIntermittent Flow
Mid volume, mid-variety products/ services
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Inputs:• Product/Service Information• Production System
Information• Operations Strategy
Process Planning & Design:• Process-Type Selection• Vertical Integration Studies• Process/Product Studies• Equipment Studies• Production Procedures Studies• Facilities Studies
Outputs:• Process
Technology • Facilities• Personnel
Estimates
Process Planning and Design System Process Planning and Design System
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Major Factors Affecting Process DesignsMajor Factors Affecting Process Designs
Nature of product/service demand Degree of vertical integration Production flexibility Degree of automation Product/Service quality
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Nature of Product/Service DemandNature of Product/Service Demand
Production processes must have adequate capacity to produce the volume of the products/services that customers need.
Provisions must be made for expanding or contracting capacity to keep pace with demand patterns.
Some types of processes are more easily expanded and contracted than others.
Product/service price affects demand, so pricing decisions and the choice of processes must be synchronized.
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Degree of Vertical IntegrationDegree of Vertical Integration
Vertical integration is the amount of the production and distribution chain that is brought under the ownership of a company.
This determines how many production processes need to be planned and designed.
Decision of integration is based on cost, availability of capital, quality, technological capability, and more.
Strategic outsourcing (lower degree of integration) is the outsourcing of processes in order to react quicker to changes in customer needs, competitor actions, and technology.
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Production FlexibilityProduction Flexibility
Product flexibility -- ability of the production (or delivery) system to quickly change from producing (delivering) one product (or service) to another.
Volume flexibility -- ability to quickly increase or reduce the volume of product( or service) produced (or delivered).
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Degree of AutomationDegree of Automation
Advantages of automation Improves product quality Improves product flexibility Reduces labor and related costs
Disadvantages of automation Equipment can be very expensive Integration into existing operations can be difficult
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Product/Service QualityProduct/Service Quality
Old viewpoint – high-quality products must be made in small quantities by expert craftsmen
New viewpoint – high-quality products can be mass-produced using automated machinery
Automated machinery can produce products of incredible uniformity
The choice of design of production processes is affected by the need for superior quality.
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Types of Process DesignsTypes of Process Designs
Product-Focused Process-Focused Group Technology/Cellular Manufacturing
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Product-FocusedProduct-Focused
Processes (conversions) are arranged based on the sequence of operations required to produce a product or provide a service
Also called “Production Line” or “Assembly Line” Two general forms
Discrete unit – automobiles, dishwashers Process (Continuous) – petrochemicals, paper
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Purchased
Components,Subassemblies
Product-FocusedProduct-Focused
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4
1
7
6
5Components Subassem.
Assemblies
Product/Material Flow
Production Operation
Ass
embl
ies
Raw Material Components
Compon.
Subassem.
Raw Material
Fin. Goods
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Product-FocusedProduct-Focused
Advantages Lower labor-skill requirements Reduced worker training Reduced supervision Ease of planning and controlling production
Disadvantages Higher initial investment level Relatively low product flexibility
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Process-FocusedProcess-Focused
Processes (conversions) are arranged based on the type of process, i.e., similar processes are grouped together
Products/services (jobs) move from department (process group) to department based on that particular job’s processing requirements
Also called “Job Shop” or “Intermittent Production” Examples
Auto body repair Custom woodworking shop
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Process-FocusedProcess-Focused
Cutting Assembly Sanding FinishingPlaning
Drilling
Shaping
Turning
11 55 77
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11 66
33
66
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22Job AJob A
Job B
44 55
Custom Woodworking Shop
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Process-FocusedProcess-Focused
Advantages High product flexibility Lower initial investment level
Disadvantages Higher labor-skill requirements More worker training More supervision More complex production planning and controlling
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Group Technology/Cellular ManufacturingGroup Technology/Cellular Manufacturing
Group Technology Each part produced receives a multi-digit code that
describes the physical characteristics of the part. Parts with similar characteristics are grouped into
part families Parts in a part family are typically made on the
same machines with similar tooling
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Group Technology/Cellular ManufacturingGroup Technology/Cellular Manufacturing
Cellular Manufacturing Some part families (those requiring significant
batch sizes) can be assigned to manufacturing cells.
The organization of the shop floor into cells is referred to as cellular manufacturing.
Flow of parts within cells tend to be more like product-focused systems
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Group Technology/Cellular ManufacturingGroup Technology/Cellular Manufacturing
Advantages (relative to a job shop) Process changeovers simplified Variability of tasks reduced (less training needed) More direct routes through the system Quality control is improved Production planning and control simpler Automation simpler
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Group Technology/Cellular ManufacturingGroup Technology/Cellular Manufacturing
Disadvantages Duplication of equipment Under-utilization of facilities Processing of items that do not fit into a family
may be inefficient
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Group Technology/Cellular ManufacturingGroup Technology/Cellular Manufacturing
Candidates for GT/CM are job shops having: A degree of parts standardization Moderate batch sizes
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Product/Process Design & Inventory PolicyProduct/Process Design & Inventory Policy
Standard Products and Produce to Stock Sales forecasts drive production schedule Maintain pre-determined finished-goods levels MRP forecast drives material ordering
Custom Products and Produce to Order Orders set production schedule and drive material
deliveries Design time (preproduction planning) may be
required before production can be scheduled
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Process Design in ServicesProcess Design in Services
Some of the factors important in process design for products are also important in services:
Nature (level and pattern) of customer demand Degree of vertical integration Production flexibility Degree of automation Service quality
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Process Design in ServicesProcess Design in Services
Three schemes for producing and delivering services Quasi-Manufacturing Customer-as-Participant Customer-as-Product
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Process Design in ServicesProcess Design in Services
Quasi-Manufacturing Physical goods are dominant over intangible
service Production of goods takes place along a production
line Operations can be highly automated Almost no customer interaction Little regard for customer relations Example – bank’s checking encoding operation
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Process Design in ServicesProcess Design in Services
Customer-as-Participant Physical goods may be a significant part of the
service Services may be either standardized or custom High degree of customer involvement in the
process Examples: ATM, self-service gas station
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Process Design in ServicesProcess Design in Services
Customer-as-Product Service is provided through personal attention to
the customer Customized service on the customer High degree of customer contact There is a perception of high quality Customer becomes the central focus of the process
design Examples: medical clinic, hair salon
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Deciding Among Processing AlternativesDeciding Among Processing Alternatives
Batch Size and Product/Service Variety Capital Requirements Economic Analysis
Cost Functions of Alternative Processes Break-Even Analysis Financial Analysis
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Process Design Depends on Product Diversity and Batch Size
Process Design Depends on Product Diversity and Batch Size
Sm
all
B
atch
Siz
e
L
arge
Few Number of Product Designs Many
ProductFocused,DedicatedSystems
ProductFocused,
BatchSystem
Process-Focused, Job Shop
CellularManufacturing
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Capital RequirementsCapital Requirements
The amount of capital required tends to differ for each type of production process
Generally, the capital required is greatest for product-focused, dedicated systems
Generally, the capital required is lowest for process-focused, job shops
The amount of capital available and the cost of capital are important considerations
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Economic AnalysisEconomic Analysis
Cost Functions of Processing Alternatives Fixed Costs
Annual cost when production volume is zero Initial cost of buildings, equipment, and other
fixed assets Variable Costs
Costs that vary with production volumes Labor, material, and variable overhead
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Cost Functions of Processing AlternativesCost Functions of Processing Alternatives
Annual Cost of Production ($000)
Units ProducedPer Year
100,000 250,000
CellularManufacturing
Preferred
AutomatedAssembly Line
Preferred
JobShop
Preferred500
1,000
2,000
1,500
Job Shop
Cellular Manuf.
Autom. Assembly Line
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Cost Functions of Processing AlternativesCost Functions of Processing Alternatives
Example
Three production processes (A, B, and C) have the following cost structure:
Fixed Cost Variable CostProcess Per Year Per Year A $120,000 $3.00 B 90,000 4.00 C 80,000 4.50
What is the most economical process for a volume of 8,000 units per year?
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Cost Functions of Processing AlternativesCost Functions of Processing Alternatives
Example
TC = FC + v(Q)
A: TC = 120,000 + 3.00(8,000) = $144,000 per yearB: TC = 90,000 + 4.00(8,000) = $122,000 per yearC: TC = 80,000 + 4.50(8,000) = $116,000 per year
The most economical process at 8,000 units is Process C, with the lowest annual cost.
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Economic AnalysisEconomic Analysis
Break-Even Analysis Widely used to analyze and compare decision
alternatives Can be displayed either algebraically or
graphically Disadvantages:
Cannot incorporate uncertainty Costs assumed over entire range of values Does not take into account time value of money
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Break-Even AnalysisBreak-Even Analysis
Example
Break-Even Points of Processes A, B, and C, assuming a $6.95 selling price per unit
Q = FC / (p-v)
A: Q = 120,000 / (6.95 - 3.00) = 30,380 unitsB: Q = 90,000 / (6.95 - 4.00) = 30,509 unitsC: Q = 80,000 / (6.95 - 4.50) = 32,654 units
Process A has the lowest break-even point.
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Economic AnalysisEconomic Analysis
Financial Analysis A great amount of money is invested in production
processes and these assets are expected to last a long time
The time value of money is an important consideration
Payback period net present value internal rate of return Profitability index
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Deciding Among Processing AlternativesDeciding Among Processing Alternatives
Assembly Charts (Gozinto Charts) Macro-view of how materials are united Starting point to understand factory layout needs,
equipment needs, training needs Process Charts
Details of how to build product at each process Includes materials needed, types of processes
product flows through, time it takes to process product through each step of flow
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Product/Service DesignProduct/Service Design
When a product/service is designed: The detailed characteristics of the product/service are
established. The characteristics of the product/service directly
affects how the product/service can be produced/ delivered.
How the product/service is produced/delivered determines the design of the production/delivery system.
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Product/Service DesignProduct/Service Design
Product/service design directly affects: Product/service quality Production/delivery cost Customer satisfaction
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Product/Service Design and DevelopmentProduct/Service Design and Development
Sources of Product Innovation Developing New Products/Services Getting Them to Market Faster Improving Current Products/Services Designing for Ease of Production Designing for Quality Designing and Developing New Services
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Sources of Product/Service InnovationSources of Product/Service Innovation
Customers Managers Marketing Operations Engineering Research and Development (R&D)
Basic research Applied research
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Steps in Developing New ProductsSteps in Developing New Products
1. Technical and economic feasibility studies
2. Prototype design
3. Performance testing of prototype
4. Market sensing/evaluation and economic evaluation of the prototype
5. Design of production model
6. Market/performance/process testing and economic evaluation of production model
7. Continuous modification of production model
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Steps in Developing New ProductsSteps in Developing New Products
1. Technical and Economic Feasibility Studies Determine the advisability of establishing a project
for developing the product If initial feasibility studies are favorable, engineers
prepare an initial prototype design
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Steps in Developing New ProductsSteps in Developing New Products
2. Prototype Design This design should exhibit the basic form, fit, and
function of the final product It will not necessarily be identical to the
production model
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Steps in Developing New ProductsSteps in Developing New Products
3. Performance Testing of Prototype Performance testing and redesign of the prototype
continues until this design-test-redesign process produces a satisfactorily performing prototype
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Steps in Developing New ProductsSteps in Developing New Products
4. Market Sensing/Evaluation and Economic Evaluation of the Prototype
Accomplished by demonstrations to potential customers, market test, or market surveys
If the response to the prototype is favorable, economic evaluation of the prototype is performed to estimate production volume, costs, and profits
If the economic evaluation is favorable, the project enters the production design phase.
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Steps in Developing New ProductsSteps in Developing New Products
5. Design of Production Model The initial design of the production model will not
be the final design; the model will evolve
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Steps in Developing New ProductsSteps in Developing New Products
6. Market/Performance/Process Testing and Economic Evaluation of Production Model
The production model should exhibit: low cost reliable quality superior performance the ability to be produced in the desired
quantities on the intended equipment
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Steps in Developing New ProductsSteps in Developing New Products
7. Continuous Modification of Production Model Production designs are continuously modified to:
Adapt to changing market conditions Adapt to changing production technology Allow for manufacturing improvements
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Managing Product Development ProjectsManaging Product Development Projects
About 5% of all new-product ideas survive to production, and only about 10% of these are successful.
It is best to cancel unpromising new-product/service development projects early!
Employees often become emotionally caught up in these projects and are overly optimistic
An impartial management review board is needed for periodic reviews of the progress of these projects.
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Getting New Products to Market FasterGetting New Products to Market Faster
Speed creates competitive advantages Speed saves money Tools to improve speed:
Autonomous design and development teams Computer-aided design/computer-aided
manufacturing (CAD/CAM) Simultaneous (concurrent) engineering
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Tools to Improve Speed to MarketTools to Improve Speed to Market
Autonomous Design and Development Teams Teams are given decision-making responsibility
and more freedom to design and introduce new products/services
Time-to-market has been slashed dramatically Enormous sums of money have been saved Teams do not have to deal with the bureaucratic
red tape ordinarily required to obtain approvals
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Tools to Improve Speed to MarketTools to Improve Speed to Market
Computer-Aided Design/Computer-Aided Manufacturing (CAD/CAM)
Engineers, using CAD/CAM, can generate many views of parts, rotate images, magnify views, and check for interference between parts
Part designs can be stored in a data base for use on other products
When it is time for manufacturing, the product design is retrieved, translated into a language that production machinery understands, and then the production system can be automatically set up.
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Tools to Improve Speed to MarketTools to Improve Speed to Market
Simultaneous(Concurrent)Engineering
Economic and TechnicalFeasibility Studies
Product/Service Ideas
Production Process DesignProduct/Service Design
Produce and MarketNew Product/Service
ContinuousInteraction
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Improving the Designof Existing Products/Services
Improving the Designof Existing Products/Services
Focus is improving performance, quality, and cost Objective is maintaining or improving market share
of maturing products/services Little changes can be significant Small, steady (continuous) improvements can add up
to huge long-term improvements Value analysis is practiced, meaning design features
are examined in terms of their cost/benefit (value).
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Designing for Ease of ProductionDesigning for Ease of Production
Ease of Production (Manufacturability) Specifications - Precise information about the
characteristics of the product Tolerances - Minimum & maximum limits on a
dimension that allows the item to function as designed
Standardization - Reduce variety among a group of products or parts
Simplification - Reduce or eliminate the complexity of a part or product
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Designing for QualityDesigning for Quality
Crucial element of product design is its impact on quality
Quality is determined by the customer’s perception of the degree of excellence of the product/service’s characteristics
Chapter 7 covers the principles of designing products/services for quality
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Designing and Developing New ServicesDesigning and Developing New Services
Three general dimensions of service design are: Degree of Standardization of the Service
Custom-fashioned for particular customers or basically the same for all customers?
Degree of Customer Contact in Delivering the Service High level of contact (dress boutique) or low level
(fast-food restaurant)? Mix of Physical Goods and Intangible Services
Mix dominated by physical goods (tailor’s shop) or by intangible services (university)?
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Designing and Developing New ServicesDesigning and Developing New Services
Differences Between New Service and New Product Development
Unless services are dominated by physical goods, their development usually does not require engineering, testing, and prototype building.
Because many service businesses involve intangible services, market sensing tends to be more by surveys rather than by market tests and demonstrations.
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Wrap-Up: World Class PracticeWrap-Up: World Class Practice
Fast new product introduction Design products for ease of production Refine forecasting Focus on core competencies ... less vertical
integration Lean production Flexible automation Job shops move toward cellular manufacturing Manage information flow ..... automate and simplify!
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End of Chapter 4End of Chapter 4