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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1413 A Case Study Approach of Quality Tools in Manufacturing Industry Sonal Kamble1, Ankur Kasbe2, Yamini Bhanage3 1,2,3Student of Department of Mechanical Engineering, Saraswati Education Society’s Group of Institution, Faculty of Engineering, Diksal, Karjat - 410201 ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - In recent years most manufacturing companies have focused on the manufacture of higher value added products with low production costs. Therefore, elimination of waste and improvement in the quality has become an important success criterion for companies to increase the productivity. This study presents the case of a leading industry that manufactureandsupplydiverse range of robotics and automation products of which an oscillator-a product used in diamond industry, found suffering from high manufacturing defect rates, excess manufacturing and assembly time leading to overall decreased productivity and profit of the company. The study plans to carry out an all-inclusive participatory investigationintooptionforsolvingtheproblemwiththehelp of DMAIC (Define-Measure-Analyze-Improve-Control) methodology of six sigma and its tools along with less expensive ways to mitigate the above noted problems to maximum. Key Words: Six sigma, Total quality management (TQM), DMAIC (Define-Measure-Analyze-Improve-Control), Check Sheet, Control Charts, 5 Why root cause analysis, Pareto analysis, Manufacturing. 1. INTRODUCTION Six sigma method is a project-driven management approach to improve the organization’sproducts,servicesandprocesses by continually reducing defects. It is a business strategy that focuses on improving customer requirements understanding, business systems, productivity, and financial performance. It is a company-wide systematic approach to achieve continuous process improvements. Six sigma is not only a technique but also a philosophy, a strategic initiative to boost profitability, increase market share and improve customersatisfactionthroughstatistical toolsthatcanleadtobreakthroughquantumgains in quality. The six sigma strategy works well in both multi-billion dollars as well as a small privatelyheldcompanies.This pilot study was carried out using six sigma methodology and tools to identify and anatomize the causes of the problem, so astofind and implement applicable solutions. The DMAIC methodology and the steps included in each phase are: Figure-1: DMAIC methodology and its step 2. METHODOLOGY 2.1 Define In phase I the observation of current scenario for the product, oscillator was carried out. The completemanufacturingprocess was observed from raw material to finished product.
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1414 Figure-2: Schematic diagram of oscillator The oscillator is a mechanical product assembled from number ofothersingularcomponents,someofwhicharemanufactured in the company while other are imported readymade. The manufacturingprocess generallyincludedprocessessuchascutting, milling, operations on (Ace Micromatic Group) AMS CNC (drilling, boring, reaming, slitting), chamfering, tapping, slotting, buffing respectively. These operations were carried out on seven different workstations. Finally, the manufactured singular components were forwarded to assembly section where with other readymade components (electric motor, bearings) assembly of oscillator was carried out manually. On mapping the process flow following observations were made: Firstly, the operations at some workstations were taking longer machining time than required due to which next operation in production line delayed further consuming more time. Secondly, time taken by assembly was distinctively more. Thirdly, two personnel’s were carrying out assembly when it can be done single handed. Fourth most, rework on faulty work pieces consumed manufacturing time in line of production and rejected finished products further added to losses. Hence, the problem was defined and the ultimate aim of the study oriented to increase the yield of the oscillator by solving its manufacturing-assembly time and issue of defect rate by overall process improvement. 2.2 Measure The oscillator manufacturing and assembly time of each component was carried out by data collection in process sheets. Individual Process sheets were made for every element of the oscillator. The time study was carried out by stopwatch. Dimensions of the elements were measured using Vernier caliperinsamplingsheets.Inordertomakestudytimemorereliable and dependable, cycle time and takt time was taken five times for each component and an average was calculated along with dimensions and number of defects. Table-1: Observed cycle time and takt time Sr. no Elements Operations Centre Block Fixed End Plate Free End Plate Shaft Ball Scre w Motor Housing Ball Screw Nut Stopper Number of Workers 1 Cutting 0.5 2.05 0.5 2.62 0.5 2.62 Cycletimeinminutes Takttimeinminutes 1 2 Milling 1 18.84 1.5 44.6 1.6 44.6 0.5 1.62 0.5 2.2 1 3 AMS (CNC) 2.4 21.13 2.5 8.37 2.5 7.41 1 4 Chamfer - 1.32 - 1.32 - 1.32 - 0.128 1 5 Tapping 0.5 1.36 0.5 0.78 0.5 0.78 0.5 0.68 0.5 0.4 1
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1415 6 Facing 0.5 1 1 7 Flat milling 0.5 0.72 1 8 Turning 1 1.73 1 1.162 1 9 Grooving - 0.04 1 10 Grinding - 0.14 1 11 Drilling 0.5 0.52 0.5 0.36 1 12 Slotting - 0.5 1 13 Cutting II 0.5 0.11 0.5 0.023 1 14 Assembly - 22.5 2 Total 21.5 192.953 15 Table-2: Observed dimensions of elements entering the operation Elements Centre block Fixed End Plate/ Free End Plate Operation Sample Milling (90x90x35) AMS (CNC) (85x85x32) Milling (90x16x14) AMS (CNC) (85x14x36) Dimensionsinmm L B H L B H L B H L B H 1 90 92 35 85 85 32 90 17 40 85 14 36.2 2 90 90.5 35 85.2 85.2 32.5 90 17 40 85 14 36.2 3 90 91 35 85 85 32 90 16 40 85.5 14.5 36 4 90 92 35 85.5 86 32 90 17 40 85 14.3 36 5 90 92 35 85 86 32.2 90 16.5 40 85.1 14 36 Average 90 91.5 35 85.14 85.44 32.14 90 16.17 40 85.12 14.16 36.08 Dimensional tolerances +1 -1 +0.02 -0.02 +1 -1 +0.02 -0.02 *L-length, B-breadth, H-height Table-3: Observed defect rate Sr no Source of defect Number of defected elements 1 Milling 3 2 AMS (CNC) 2 3 Assembly 2 4 Customer 1 2.3 Data analysis In this phase III, the data and the root causes of failure in product manufacturing and assemblyprocessare analyzed. Takttime had been calculated for manufacturing of oscillator components to determine how often a line should process one part, based on rate of sale, for fulfilling the customer requirement. Thus, the takttimeisusedasa guidelineintheproductionlinebalancing to re-design the future process. If the cycle time of a work operation is higher than calculated takt time, that particular work operation is the bottleneck. This may be causing overproduction waste or work in process (WIP) in some areas that required extra processing time, such as overtime, to meet demand.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1416 Takt time = Table-4: Calculation of takt time Shift length (A) 9 hours = 9x60 = 540 minutes Breaks (B) ( 1 small tea break x 10 mins) + (60 mins lunch break) + (10 mins material handling time) + (5 mins maintenance time) + (5 mins clean up time) = 90 minutes Planned Production (C) (A-B) = 540-90=450 minutes Customer Demand (D) 25 oscillators having 8 individual component Thus, 25 x 8 = 200 pieces in 6 days That is 200÷6 = 33.33 pieces per day Takt time 450÷33.33 = 13.50 minutes/piece The observed takt time is different than calculated takt time. From table-1, it can be observed that some work process are taking longer than required time and their takt time is more, causing long waiting time for part arrival and longer time to complete the assigned process. Assembly time is more and defect rate is unacceptable. From table-2, it is seen that elements entering Milling operation widely varies in dimensions, although after milling for desired dimensions some of the elements entering next process station- AMS (CNC) operations shows unacceptable tolerances, which is the leading cause for further dimensional error of the operations and rejection and rework of the element. Within acceptable tolerances the element remained un-rejected though it increases assembly time so as to make adjustments according to acquired tolerances of the elements due to pressure of timely delivery and prevention of losses. Thus the dimensional accuracy should be maintained at Milling and atAMS(CNC)operationsto avoidbottleneck,rework,rejection,high machining time and decrease assembly time and man labor. Pareto analysis is based on the 80/20 principle that is 80% of problems can be solved by solving 20% of key problems. Chart-1: Pareto Analysis of rejection Rate The 80% line drawn on chart helps to establish the “Vital few”sourcesofproblemsthat needstobeaddressedatforefrontfrom “Trivial many”. Usually solving vital problems subsidizes the trivial issues. From chart-1, the Milling and AMS (CNC) operations fall under vital few percentage. Thus focusing on these20%vital sources will help solve 80% of problems. Thus the main focus of this study remains to improve manufacturing process at these two work stations but removing bottleneck, high operation time and variation in dimensions. After pinpointing sources of problems through Pareto analysis, brainstorming and discussions were carried out to find out basis of cause of failures. Thus, the 5 why analysis was carried out to establish the root causes of failure in oscillator. The root causes are based on by repeatedly asking the question “Why” (thumb rule-five times), which peels away the layersof symptoms which can lead to the root cause of the problem.
5.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1417 Table-5: Five why root cause analysis Sr no Issues Bottleneck at Milling operation of center block and Free/Fixed end plate High operation time at AMS (CNC) operation of Centre block and Free/Fixed end plate High rate of rejection from customer and assembly line High assembly time Increased man labor Variation in dimensions 1 Why Increased takt time and operation time and rework Increased takt time Failure in design element Increased efforts to assemble elements in place Rework on element Lack of inspection at work station after operation Improper tooling Improper alignment of machined elements 2 Why Variance in operation tools arrangement Variance in operation tools arrangement Error in tolerance of dimensions Improper alignment of machined elements Rejection from assembly line, AMS (CNC) workstation Lack of tooling knowledge 3 Why Dimensional variability of elements arriving at milling work station Dimensional variability of elements arriving at AMS (CNC) work station Lack of inspection of elements dimensions leaving work station Error in tolerances of dimensions Variance in dimension of elements 4 Why Lack of dimensional tolerance of elements arriving at milling station Lack of dimensional tolerance of elements arriving at AMS (CNC) work station Lack of inspection of elements dimensions leaving work station Lack of inspection of elements dimensions leaving work station 5 Why Lack of inspection of elements dimensional inspection Lack of inspection of elements dimensional inspection It can concluded that main causes for bottleneck, high operation time, dimensional error and excessive manpower are improper tooling, unnecessary process handling, inconsistent work operation sequence, unbalanced workstation, defective items and lack of inspection. This in turn causing high assembly time, rejection and rework. 2.4 Improve This phase IV is to ameliorate the manufacturing process with effective solutions after analysing the current situation. The considerations that would be taken into account towards the solutions proposed included budget, feasibilityandthe expected outcome of each station. The improvement listed are mutually exclusive to each other but are proposed in relation to the manufacturing process as whole, it might affect certain workstations as well as other improvements.
6.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1418 Table-6: Enlistment of improvements or solutions Sr no Issues/Problems Solutions 1 Bottleneck at milling operation Inspection sheet forcomponentsleavingcuttingoperationandmillingoperation Use of improved face mill tool with increase feed rate from 0.002 to 0.005 per tooth is used to reduce machining time 2 High operation time at AMS (CNC) Use of U-drill in center block instead of twisted drill bitto reduce operationtime Use of Centre-finder of every component before AMS (CC) operation Inspection sheet for components leaving AMS (CNC) operation 3 High rate of rejection from customer Improvement in design failure of the component “Stopper”. 4 High rate of rejection from assembly line Selective inspection of components before entering assembly line 5 High assembly time Use of inspection sheet and selective inspection as mentioned above 6 Increased man labor Application of above solutions will reduce rework, rejection thus consequently reduces man labor 7 Variation in dimensions Proper tooling, operation and inspection as mentioned above subsequently reduces dimensional variability Figure-3: Changes in design of stopper Figure-4: Sample inspection sheet used in improvement phase Although the sample inspection sheet in figure-4, was used for time being, it is subjected to changes as the improvement process further enhances. For this project, the inspection sheet was used attwodifferentworkstations-millingand AMS(CNC) machine and at assembly for three vital components of the product- center block, fixed and free end plate. Vernier caliperwas used as a measuring device for carrying out inspection. Use of inspection for in detailed operations will further improve the process productivity and will help to reduce defect rates, also use of intrinsic measuring instruments such as micrometer can be used for increased accuracy. By implementing improvements into manufacturing process, the operators are more utilized with less rework duetoreduced defect rate, the productivity of the process is increased, and the process shows no bottleneck since all the cycle time is under takt time, making the process smoothed influencing cost savings.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1419 Table-7: Improved overall process time for each workstation Sr. no Elements Operations Centre Block Fixed End Plate Free End Plate Shaft Ball Scre w Motor Housing Ball Screw Nut Stopper Number of Workers 1 Cutting 0.5 2.05 0.5 2.62 0.5 2.62 Cycletimeinminutes Takttimeinminutes 1 2 Milling 0.5 18.84 0.5 22.61 1.5 22.61 0.5 1.62 0.5 2.2 1 3 AMS (CNC) 1.5 14.46 1.5 6.89 2.5 5.73 1 4 Chamfer - 1.32 - 1.32 - 1.32 - 0.128 1 5 Tapping 0.5 1.36 0.5 0.78 0.5 0.78 0.5 0.68 0.5 0.4 1 6 Facing 0.5 1 1 7 Flat milling 0.5 0.72 1 8 Turning 1 1.73 1 1.162 1 9 Grooving - 0.04 1 10 Grinding - 0.14 1 11 Drilling 0.5 0.52 0.5 0.36 1 12 Slotting - 0.5 1 13 Cutting II 0.5 0.11 0.5 0.006 1 14 Assembly - 10 1 Total 14 126.626 14 Table-8: Improved dimensions of elements entering the operation Elements Centre block Fixed End Plate/ Free End Plate Operation Sample Milling (90x90x35) AMS (CNC) (85x85x32) Milling (90x16x14) AMS (CNC) (85x14x36) Dimensionsinmm L B H L B H L B H L B H 1 90 90 35 85 85 32 90 16 40 85 14 36.02 2 90 90.5 35 85 85 32 90 16.2 40 85 14 36.02 3 90 90.5 35 85.02 85.02 32.03 90 16 40 85 14 36 4 90 90.2 35 85.02 85 32.02 90 16 40 85.02 14 36 5 90 90 35 85 85 32 90 16.1 40 85.02 14 36.02 Average 90 90.2 35 85 85 32 90 16.06 40 85 14 36 Dimensional tolerances +1 -1 +0.02 -0.02 +1 -1 +0.02 -0.02 *L-length, B-breadth, H-height
8.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1420 Table-9: Reduced defect rate Sr no Source of defect Number of defected elements 1 Milling 0 2 AMS (CNC) 1 3 Assembly 1 4 Customer 0 2.5 Control The aim of the control phase is to sustain gains from processes which had improved by institutionalizing process or product improvements and controlling operations. This project being a pilot study and due to time limits, the improvements were applied for singular batch of five of oscillator manufacturing process. However, the two batches of oscillator under consideration for study had shown tremendous improvement in manufacturing process with simple application of six sigma and its quality tools. For future benefits at large levels, the improvements carried out in this study at small scale needed to be implemented, sustained, monitored and controlled further in future as mentioned below: Inspection sheets Making a habit of compulsion to cutting, milling and AMS (CNC) operator to fill outinspectionsheetsonaverageoffivecount in the batch of twenty-five oscillators. The inspection can be carried out initially on alternate component basis till the operator gets his hands on with the process and also it will ensure consistency of quality from previous and later work station operations. However after satisfactory results, the inspection can be average to five percent inspection of thebatchsize,asthe manufacturing process is smoothed out. Knowledge of proper tooling As it was observed that use of proper tooling can affect cycle time of an operation tremendously. Thus, getting equipped with modernized tools and their also training operators regarding the same can save man labour, time and finance of the company. Operators with knowledge on tooling can further adds to improvement in process of manufacturing of other products also. Process map The process map of the new process that was created during improve phase should be reviewed and updated as necessary to reflect any modifications that may have occurred during roll out. It will be used for training and reference so that the new process will be clear. In case of multiple individual involvement in the process, a deployment flowchart should also be developed to clarify roles and task. Process monitoring plan The most critical aspect of control is establishing a plan to monitor the new process and act when results are not up to spec,so that the project gains will be maintained. The monitoring plan clarifies how the process performance will be continuously monitored, who will be notified if there is a problem and how that will happen and what response is required. The first part of the monitoring plan specifies the metrics that will be trackedtosummarizeprocessperformance,aswell asspecifyinghowand how often they will be tracked. The monitoring plan also indicates what constitutes satisfactoryperformanceandwhatshould be considered red flag indicating possible problems. Control charts A control chart should be continuously updated so that the manufacturing head can watchforprocessshiftsorother signsthat there may be a problem with process performance. Brainstorming Even after successful implementation of six sigma and its quality tools for process improvement, to maintain that gain continuous brainstorming between operators, engineers and managers is required. The brainstorming can be done during
9.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1421 training lectures, in meets on regular basis. Thishelpstoshareknowledgeandfurtherimprovescompany productivityasevery element of company is thriving towards betterment. A small improvement in any ongoing process improvement can further enhance potential of company output and make it stand competitive market with quality assurance. 3. RESULT The results after implementation had been compared, analyzed and gathered. From the implementation results, the project goal was contentedly achieved with the performance in terms of reduction of total cycle time,takttime,defectrate,manpower and dimensional tolerance. The achievement is not only to prove the robustness ofthe processimprovementmethodologybut also to weigh up the acceptability ad practicality of the developed methodology for industrial application. Table-10: Comparison before and after Total cycle time (minutes) Takt time (minutes) Defect Rate (Percentage) Manpower Dimensional tolerances Before improvement process (x) 192.953 21.5 40 15 +0.835 +0.18 After improvement process (y) 126.626 14 10 14 +0.42 +0.00 Percentage in reduction 34.37 34.88 75 6.66 49.70 100 74.85% Formula used in calculating percentage is, Reduction in percentage = (x-y) ÷x *100 4. CONCLUSION The process improvements methodology that has been developed based on six sigma concept had improved the flow of completing the project by separating the task into phases. This model is leading the project to better utilization of resources, decreases the unnecessary wastes and maintains consistent quality of the process output via systematic and well-organized phases. The six sigma improvement methodology, viz. DMAIC project shows that the performanceofthecompanyisincreased to a better level as regards to: enhancement in customer satisfaction, adherence of delivery schedules, and development of specific methods to redesign and recognize a process with a view to reduce or eliminate errors, defects; development of more efficient, capable, reliable and consistent manufacturing process and more better overall process performance, creation of continuous improvement and “do it right, the first time” mind-set. 5. ACKNOWLEDGEMENT We owe our deep gratitude to our project guide Prof. Jayant Chaudhari who took keen interest on our projectwork andguided us all along, till the completion of our project work by providingall thenecessaryinformationfordevelopinga good project.We respect and thank Mr. Saeed Mokashi (CEO), Mr. Fazal Mokashi sir and Mr. M. Raza (Manufacturing Manager) and special heartily and grateful thank to all the working staff for providing us an opportunity to do theprojectwork inDrupeEngineering Private Limited and giving us all support and guidance which made us complete the project duly. We would not forget to remember Mr. Nadeem of Miki Pulley Private Limited (India) along with their entire working staff. We heartily thank to Prof. Praful Jawanjal (Principle) for his guidance and suggestions during this project work. We arethankful toandfortunateenough to get constant encouragement, support and guidance from all theteachingstaffsofMechanical Departmentwhich helpedusin successfully completing our project work. 6. REFERENCES [1] Thomas Pyzdek, The six sigma handbook, McGraw Hill. Inc.,2003 [2] Martand Telsang, Industrial Engineering and Production Management, S. Chand, 2012 [3] Polytip Jirasukpasert, Jose Arturo Garzareyaes, Horacio Soriano-Meier, Luis Rocha-Lona, 2012, “A case study of defects reduction in a rubber gloves manufacturing process by applying six sigma methodology”, International Conference on Industrial Engineering and Operations Management, Istanbul, Turkey.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1422 [4] Low Shye Nce, Shardul Kamaruddin, Ong long, Chip Wai Tein, Amira Nadwa Hamdan, 2012, “Adaptation of six sigma concept in process improvement methodology: a case study”, International Journal of Engineering Technology and Advanced Engineering, Volume 2 Issue 7. [5] Mehdiuz Zaman, Sujit Kumar Pattanayak, Arun Chandra Paul, 2013, “Study if feasibility of six sigma implementation in a manufacturing industry: a case study”, International Journal of Mechanical Engineering (IJMIE), volume 3 Issue 1.
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