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IRJET- Value Stream Mapping (VSM) – A Case Study in Manufacturing Facility
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 11 | Nov 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1 Value Stream Mapping (VSM) – A Case Study in Manufacturing Facility Ajinkya Rajule1, Shubham Umbare2, Bhimashankar Dhavle 3, Prof.N.C.Mundhada4 1,2,3Final year students, Mechanical Engineering Department, Institute of knowledge college of engineering, Pimpale jagtap, Pune, Maharashtra, India. 4HOD of Mechanical Engineering Department, Institute of Knowledge college of engineering, Pimpale jagtap, Pune, Maharashtra, India. ----------------------------------------------------------------------***--------------------------------------------------------------------- Abstract – Value is needed performance at minimum cost. Each activity must add value in the organization. If there is no Value addition, then it in Non-value addition activity which is treated as Waste. Waste is undesirable & results in organization’s downfall. This paper applies the principal of lean in manufacturing facility with a purpose to eliminate waste. Value Stream Mapping tool was used to expose the waste in the process flow and identify the kaizen activities required for improvement. The results achieved in the proposed plan showed significant improvements in the productivity and better utilization of resources with high quality service. Key Words: Lean Methodology, Value, VSM, Current state VSM, Future state VSM, etc 1. INTRODUCTION The Lean methodology implementation started with the creation of a VSM of the existing situation. Products, information, or services flow through a value stream. A value stream is all the actions (both value added, and nonvalue added) currently required to transform raw material into a finished product, from the suppliers to the end users. Mapping of flow of Value from Entry gate to Customer end is called VSM. VSM helps to – 1) Identify the kaizen activities required to improve. 2) Identify waste in the process. By focusing efforts on reducing wasteful activities, manufacturing organizations can become more productive, stay competitive in market, become moreprofitable&attain organizational goals. The general wastes that occur during process are 1.1 Over Production Manufacturing an item before it is actually required. This creates excessive lead time, results in high storage costs, and makes it difficult to detect defects. 1.2 Waiting Waiting because of poor material flow, operation dependency - that is next assembly line waiting for subassemblies to be completed & feed to them and waiting due to distances between work centers is too great. Linking processes together so that one feeds directly into the next can dramatically reduce waiting. 1.3 Transportation Transporting product between processes is a costincursion which adds no value to the product. 1.4 Inappropriate processing Use of expensive high precision equipment’s where simpler tools would be sufficient. 1.5 Unnecessary Inventory Inventory in the form raw material ordered in excess of customer requirement (To get bulk discounts) and of finished goods sitting inwarehouse(Incasecustomerorders them). 1.6 Unnecessary Motion Ergonomic waste in all instances of bending, stretching, walking, lifting & reaching. 1.7 Defects Quality defects resulting in rework or scrap are a tremendous cost to the organization. Associated costs include quarantining inventory, reinspecting, rescheduling & capacity loss. Case Study Case study performed in a manufacturing organization at Pune. General information about the organization is a manufacturing organization having Production, Quality, Research & development, Sales & Purchasing, Human Resource Management, Accounting and Finance Department. Working shifts are three, 8.5 hrs, 8.5 hrs and 7 hrs. Case study is done for production department working in three shifts.
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 11 | Nov 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 2 The cycle time required for each process is given in Table 1. Manufacturing Process Cycle time: Table 1 Process Cycle Time (Hrs.) Sub Assembly 23 Main Assembly 16 Testing 4 Quality Inspection 3 FG 2 Takt Time Analysis Takt time is the average time between the start of production of one unit and the start of production of the next unit, when these production starts are set to match the rate of customer demand. The manufacturing organization as explained above works in three shifts. The first & second shift include 30 minutes lunch break, 20 minutes breakfast & 10 minutes tea time. Net available time in first & second shift = 510-30-20-10 = 450 minutes each. For third shift the total break is of 30 minutes. Net available time in third shift = 420 – 30 =390 minutes. Total available time in three shifts = 450+450+390=1290 Minutes. On an average, the customer demand is 1 units per day and available time is 1290 minutes. So the takt time iscalculated below. • Takt time = Available time/ Customer demand • Takt time = 1290/1 = 1290 Minutes. • Takt Time = 21.5Hrs VSM Value stream mapping is a recognized method used as part of Six Sigma lean methodologies. With the process flow & cycle time available, we can draw the value stream map of current state. The VSM is created by a predefined set of icons shown in below figure. Fig1- Value stream mapping Symbols. Current State VSM Fig2- Current state value stream mapping The process starts when warehousedeliversrawmaterial to sub assembly line. The sub assembly team has to count the raw material as per move order and segregate & handover the main assembly team it’s material. After sub assembly finishes its processes, they push the product towards main assembly. If themainassemblyline is free they will receive the sub assembly and start further processing or else the sub-assemblies stand as inventory. After main assembly is completed, the product goes for testing. Since main assembly cycle time is more, the waiting time for testing team is more. Quality inspection is done after testing is completed. The quality team after inspection puts a OK / NOTOK/HOLDtag on the product and on that basis further Acceptance / Rejection / Rework will be done. When accepted, the FG team looks for final shipment of the product. After study the current process and map we identifiedsome of the problems which occur during the process.
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 11 | Nov 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3 Major Problems: - • Over-processing in the form of counting & segregation of raw material. • Excess Inventory storage in sub assembly line due to uneven loading of work in sub & main assembly. • Waiting time for testing team. • Defect leading to rework or rejection. Proposed Plan • The plan is to do BOM segregation in system & provide it to warehouse team so thattheycandoall the counting’s and deliver ready kitting’s to assembly line. • Do level loading of work load in sub & main assembly to reduce inventory storage in sub assembly as well as reduce waiting time for testing team. • To set quality inspection after eachstationtoarrest defects immediately & avoid rework & rejection. Future State VSM Eliminated material counting,segregationandreducedcycle time by 25 – 30 minutes of sub assembly team. Level loaded the work stations resulting in reduced inventory & saved shop floor space. Implemented kaizen & increased one manpower in main assembly team to reduce its activity time by 1.33Hrs which also reduced waiting time for testing team by about 1Hr. Eliminated over processing on defective parts by implementing station wise inspection. The improved future state after implementing proposed plan is shown below. Fig3- Future state value stream mapping. 3. RESULT: • The Improved cycle time for each process in future state mapping is given in Table 2. Table 2 Process Cycle Time (Hrs.) Sub Assembly 21 Main Assembly 15.5 Testing 4 Quality Inspection 3 FG 2 • Comparison of results between Current State & Future State. Table 3. Item Current State Mapping Future State mapping Cycle Time 48 Hrs 45.5 Hrs Takt time 21.5Hrs 18.8 Hrs Lead Time 9 Days 8.78 Days CONCLUSIONS In general, it was shown that the Value Stream Mapping is an ideal tool of six sigma Lean methodology to expose the waste in a value stream and to identify tools for improvement. In the Implementation of lean, Value stream mapping is suited to start the Process, it very quickly yields benefits such as Improved quality, Reduction in lead times, Reduced Inventory and Better use of Resources. The results achieved in the proposed plan showed significant improvements in the process flow of assembly line which improves Overall efficiency. 4. ACKNOWLEDGEMENT Special thanks for his valuable Guidance to Mr. N. S. Mundhada, HOD Mechanical Engineering Department, Institute of Knowledge, college of Engineering, PimpaleJagtap.
4.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 11 | Nov 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 4 REFERENCES [1] SA Umbredkar and Nitin Solke “An application of value stream mapping in manufacturing of taper roller bearing for identification of bottlenecks”, International Journal of Applied Engineering Research, 2015. [2] Rahani Ar and Muhammad al- Ashraf,2012,“Production Flow Analysis through Value Stream Mapping: A Lean Manufacturing Process Case Study”, International Symposium on Robotics and Intelligent Sensors, 17271734. [3] Zahraee, S. M., Hashemi, A., Abdi, A. A., Shahpanah, A., &Rohani, J. M. (2014). Lean Manufacturing Implementation ThroughValueStreamMapping:ACase Study. JurnalTeknologi, 68(3), pp.119-124. [4] Zahraee, S. M., Shariatmadari, S., Ahmadi, H. B., Hakimi, S., &Shahpanah, A. (2014). Application of Design of Experiment and Computer Simulation to Improve the Color Industry Productivity: Case Study. JurnalTeknologi, 68(4), pp.7-11. [5] Zahraee, S. M., Golroudbary, S. R., Hashemi, A., Afshar, J., &Haghighi, M. (2014). Simulation of Manufacturing Production Line Based on Arena. In Advanced Materials Research,933, pp. 744-748. [6] Rother, M., Shook, J., (2009), Learning to See– ValueStream Mapping to Create Value and Eliminate Muda. Lean Enterprise Institute, Cambridge (USA). 1–4. AUTHORS Ajinkya Rajule Final year students, Mechanical Engineering Department, Institute of knowledge college of engineering. Shubham Umbare Bhimashankar Dhavle Final year students, Mechanical Engineering Department, Institute of knowledge college of engineering Prof. N.C. Mundhada Final year students, Mechanical Engineering Department, Institute of knowledge college of engineering Final year students, Mechanical Engineering Department, Institute of knowledge college of engineering.
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