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CONWIP
Constant work in process or CONWIP are pull-oriented production control systems. Such systems can be classified as pull and push systems (Spearman et al. 1990). In a push system, the production order is scheduled, and the material is pushed into the production line. In a pull system, the start of each product assembly process is triggered by the completion of another at the end of production line. This pull-variant is known for its ease of implementation. CONWIP is a kind of single-stage kanban system and is also a hybrid push-pull system. While kanban systems maintain tighter control of system WIP through the individual cards at each workstation, CONWIP systems are easier to implement and adjust, since only one set of system cards is used to manage system WIP.Marek, Richard P. et al., Understanding the fundamentals of Kanban and CONWIP pull systems using simulation, Proceedings of the 2001 Winter Simulation Conferenc/ref> CONWIP uses cards to control the number of Work in proce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kanban
Kanban ( meaning signboard) is a scheduling system for lean manufacturing (also called just-in-time manufacturing, abbreviated JIT). Taiichi Ohno, an industrial engineer at Toyota, developed kanban to improve manufacturing efficiency. The system takes its name from the cards that track production within a factory. Kanban is also known as the ''Toyota nameplate system'' in the automotive industry. A goal of the kanban system is to limit the buildup of excess inventory at any point in production. Limits on the number of items waiting at supply points are established and then reduced as inefficiencies are identified and removed. Whenever a limit is exceeded, this points to an inefficiency that should be addressed. In kanban, problem areas are highlighted by measuring lead time and cycle time of the full process and process steps. One of the main benefits of kanban is to establish an upper limit to work in process (commonly referred as "WIP") inventory to avoid overcapacity. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Factory Physics
''Factory Physics'' is a book written by Wallace Hopp and Mark Spearman, which introduces a science of operations for manufacturing management. According to the book's preface, Factory Physics is "a systematic description of the underlying behavior of manufacturing systems. Understanding it enables managers and engineers to work with the natural tendencies of manufacturing systems to: * Identify opportunities for improving existing systems * Design effective new systems * Make the trade-offs needed to coordinate policies from disparate areas The book is used both in industry and in academia for reference and teaching on operations management. It describes a new approach to manufacturing management based on the laws of Factory Physics science. The fundamental Factory Physics framework states that the essential components of all value streams or production processes or service processes are demand and transformation which are described by structural elements of flows and stocks. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Material Requirements Planning
Material requirements planning (MRP) is a production planning, scheduling, and inventory control system used to manage manufacturing processes. Most MRP systems are software-based, but it is possible to conduct MRP by hand as well. An MRP system is intended to simultaneously meet three objectives: * Ensure raw materials are available for production and products are available for delivery to customers. * Maintain the lowest possible material and product levels in store * Plan manufacturing activities, delivery schedules and purchasing activities. History Prior to MRP, and before computers dominated industry, reorder point (ROP)/reorder-quantity (ROQ) type methods like EOQ (economic order quantity) had been used in manufacturing and inventory management. MRP was computerized by the aero engine makers Rolls-Royce and General Electric in the early 1950s but not commercialized by them. It was then 'reinvented' to supply the Polaris program and then, in 1964, as a response to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Just-in-time Manufacturing
Lean manufacturing is a method of manufacturing goods aimed primarily at reducing times within the production system as well as response times from suppliers and customers. It is closely related to another concept called just-in-time manufacturing (JIT manufacturing in short). Just-in-time manufacturing tries to match production to demand by only supplying goods that have been ordered and focus on efficiency, productivity (with a commitment to continuous improvement), and reduction of "wastes" for the producer and supplier of goods. Lean manufacturing adopts the just-in-time approach and additionally focuses on reducing cycle, flow, and throughput times by further eliminating activities that do not add any value for the customer. Lean manufacturing also involves people who work outside of the manufacturing process, such as in marketing and customer service. Lean manufacturing (also known as agile manufacturing) is particularly related to the operational model impleme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lean Manufacturing
Lean manufacturing is a methods of production, method of manufacturing goods aimed primarily at reducing times within the Operations management#Production systems, production system as well as response times from suppliers and customers. It is closely related to another concept called just-in-time manufacturing (JIT manufacturing in short). Just-in-time manufacturing tries to match production to Supply and demand, demand by only supplying goods that have been ordered and focus on efficiency, productivity (with a commitment to continuous improvement), and reduction of "wastes" for the producer and supplier of goods. Lean manufacturing adopts the just-in-time approach and additionally focuses on reducing Cycle time variation, cycle, flow, and Throughput (business), throughput times by further eliminating activities that do not add any Value (economics), value for the customer. Lean manufacturing also involves people who work outside of the manufacturing process, such as in marketi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Work In Process
Work in process or work-in-process, (WIP), work in progress (WIP), goods in process, or in-process inventory refers to a company's partially finished goods waiting for completion and eventual sale, or the value of these items. The term is used in supply chain management, and WIP is a key input for calculating inventory on a company's balance sheet. In lean thinking, inappropriate processing or excessive processing of goods or work in process, "doing more than is necessary", is seen as one of the seven wastes (Japanese term: '' muda'') which do not add value to a product. WIP inventory in supply chain management WIP inventory calculations can help a company assess their supply chain health and guide in supply chain planning. In most cases, it is ideal to have low WIP inventory levels, and companies that manage their inventory level efficiently tend to have lower costs. Managing WIP inventory requires coordination between several functions within a company, as well as with supplie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Production Control
Within supply chain management and manufacturing, production control is the activity of monitoring and Control (management), controlling any particular production or operation. Production control is often run from a specific control room or operations room. With inventory control and quality control, production control is one of the key functions of operations management. Overview Production control is the activity of monitoring and controlling a large physical facility or physically dispersed service. It is a "set of actions and decision taken during Manufacturing, production to regulate output and obtain reasonable assurance that the specification will be met."S. N. Ghosh (ed.) ''Cement and Concrete Science & Technology.'' 1991. p. 419 The American Production and Inventory Control Society, nowadays APICS, defined production control in 1959 as: :''Production control is the task of predicting, planning and scheduling work, taking into account manpower, materials availability and o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
System
A system is a group of interacting or interrelated elements that act according to a set of rules to form a unified whole. A system, surrounded and influenced by its open system (systems theory), environment, is described by its boundaries, structure and purpose and is expressed in its functioning. Systems are the subjects of study of systems theory and other systems sciences. Systems have several common properties and characteristics, including structure, function(s), behavior and interconnectivity. Etymology The term ''system'' comes from the Latin word ''systēma'', in turn from Greek language, Greek ''systēma'': "whole concept made of several parts or members, system", literary "composition"."σύστημα" , Henry George Liddell, Robert Scott, ''A Greek–English Lexicon'', on Pers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Production Line
A production line is a set of sequential operations established in a factory where components are assembled to make a finished article or where materials are put through a refining process to produce an end-product that is suitable for onward consumption. Typically, raw materials such as metal ores or agricultural products such as foodstuffs or textile source plants like cotton and flax require a sequence of treatments to render them useful. For metal, the processes include crushing, smelting and further refining. For plants, the useful material has to be separated from husks or contaminants and then treated for onward sale. History Early production processes were constrained by the availability of a source of energy, with wind mills and water mills providing power for the crude heavy processes and manpower being used for activities requiring more precision. In earlier centuries, with raw materials, power and people often being in different locations, production wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Work In Process
Work in process or work-in-process, (WIP), work in progress (WIP), goods in process, or in-process inventory refers to a company's partially finished goods waiting for completion and eventual sale, or the value of these items. The term is used in supply chain management, and WIP is a key input for calculating inventory on a company's balance sheet. In lean thinking, inappropriate processing or excessive processing of goods or work in process, "doing more than is necessary", is seen as one of the seven wastes (Japanese term: '' muda'') which do not add value to a product. WIP inventory in supply chain management WIP inventory calculations can help a company assess their supply chain health and guide in supply chain planning. In most cases, it is ideal to have low WIP inventory levels, and companies that manage their inventory level efficiently tend to have lower costs. Managing WIP inventory requires coordination between several functions within a company, as well as with supplie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
