Khóa luận tốt nghiệp analysis of the quality control at kruger vietnam factory

HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY AND EDUCATION FACULTY FOR HIGH QUALITY TRAINING GRADUATION THESIS ANALYSIS OF QUALITY CONTROL AT KRUGER VIETNAM FACTORY Name : HO QUOC LAP Student ID: 19124075 Major : INDUSTRIAL MANAGEMENT Supervisor: NGUYEN THI ANH VAN, MBA Ho Chi Minh City, May 2023 HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY AND EDUCATION FACULTY FOR HIGH QUALITY TRAINING GRADUATION THESIS ANALYSIS OF QUALITY CONTROL AT KRUGER VIETNAM FACTORY Name : HO QUOC LAP Student ID: 19124075 Major : INDUSTRIAL MANAGEMENT Supervisor: NGUYEN THI ANH VAN, MBA Ho Chi Minh City, May 2023 COMMENTS OF ADVISOR HCMC, ……/05/2023 Advisor COMMENTS OF REVIEWER HCMC, ……/05/2023 Reviewer ACKNOWLEDGEMENTS During training and knowledge exchange at the school, the author would like to thank the teachers of the Faculty of High-Quality Training in Industrial Management for providing the author with much practical, precious knowledge This is considered a solid premise for the author to take a step forward, an overview to help the author discover the sky of knowledge and receptivity at work In particular, the author did not forget to express her deepest gratitude to Ms Nguyen Thi Anh Van - the Quality Management Department lecturer under the Faculty of Economics, Ho Chi Minh City University of Technology and Education Thank you for always supporting, helping, and orienting the author in the process of making the report and as a guideline to help the author orient himself in the future During the implementation of the report, the author would like to thank the leaders of Kruger Vietnam Ventilation Industry Co., Ltd., the Quality Control Department, and all the staff in the project Other departments have always created conditions, helped, and created the most comfortable atmosphere for the author to have the opportunity to study, improve knowledge, and have practical contact with the production environment at the enterprise Finally, the author would like to thank all of you at the Quality Assurance department for your guidance and help and for providing the author with the necessary documents so that the author can the work smoothly and complete the best report Ho Chi Minh City, 28/04/2023 Student name Lap Ho Quoc Lap i LIST OF ABBREVIATION Abbreviation Explanation AHP Analytic Hierarchy Process AQL Acceptance Quality Limit IQC Input Quality Control KVN Kruger Vietnam NCR Nonconformance Report NG Not Good QC Quality Control SA Shipment Advise ii LIST OF TABLE Table 1.1: The milestones of the formation and development of Kruger corporation and Kruger Vietnam Table 1.2: Typical fan lines at KVN, illustrations and applications Table 3.1:Tole sampling plan table 22 Table 3.2: Input Tole Quality Control Process 24 Table 3.3:Quality control process in finished product warehouse area 40 Table 4.1: Statistical table of the number of fans produced in KVN 44 Table 4.2: Statistical table of common errors at KVN (unit: piece) 45 Table 4.3: Questionnaire to survey experts' opinions with factors suggested by the author 50 Table 4.4: Table of first round Delphi interview results 52 Table 4.5: CVR Value 52 Table 4.6: Typical pairwise comparison scale for the AHP method 54 Table 4.7: Priority assessment table for criteria pairs 54 Table 4.8: Pair-wise comparision matrix 56 Table 4.9: Normalised Pair-wise comparision matrix 57 Table 4.10: RI values for the different values of n 58 Table 4.11: Summary of the weights of the criteria, the weight of each criterion and consistent vector 59 Table 4.12: Ranking of weights for each indicator in terms of importance .59 Table 4.13: Assembly manual recommended by the author 61 Table 4.14: Hub semi-finished test sheet suggested by the author……………………64 iii LIST OF FIGURE Figure 1.1: Head office of Kruger Vietnam company Figure 1.2: Logo of Kruger Vietnam Ventilation Industry Co., Ltd Figure 1.3: Organization chart of the company Kruger Vietnam Figure 2.1: Fishbone diagram 13 Figure 3.1: Illustration of TDA fan series 17 Figure 3.2: TDA fan components indicated 18 Figure 3.3: The process of checking the quality of input materials 19 Figure 3.4: Tole is placed on a pallet and secured with a steel belt 25 Figure 3.5: Motor before quality check 26 Figure 3.6: Standard Name Plate of Motor 26 Figure 3.7: Motor in stock after quality inspection from IQC department 28 Figure 3.8: Tube Casing finished product 28 Figure 3.9: Tole received from warehouse staff before putting into production 29 Figure 3.10: Pareto chart showing errors at Tube Casing assembly area in the first months of 2022 31 Figure 3.11: Technical drawing of TDA propeller 32 Figure 3.12: Image of motor base, motor supt 34 Figure 3.13: Stage assembling TDA fan 35 Figure 3.14: Stage assembling TDA fan 36 Figure 3.15: Hub semi-finished products 37 Figure 3.16: Stage assembling TDA fan 38 Figure 3.17: Stage assembling TDA fan 38 Figure 3.18: Measuring device for balance and vibration of N600 fan used at KVN 39 Figure 4.1: Pareto chart of common types of errors at KVN 45 iv Figure 4.2: Cause-and-effect diagram of the causes of the error of bolt-nut confusion when assembling 46 Figure 4.3: Cause-and-effect diagram of the causes of incorrect and uneven Hub size reaming errors 48 Figure 4.4: Bolt-nut identification sticker at the assembly suggested by the author 62 v CONTENT ACKNOWLEDGEMENTS i LIST OF ABBREVIATION ii LIST OF TABLE iii LIST OF FIGURE .iv INTRODUCTION TO THE REPORT 1 Introduction Objectives of the study Research objective and research scope of the topic Research methodology Structure of thesis CHAPTER 1: OVERVIEW ABOUT KRUGER VENTILATION INDUSTRIES VIETNAM CO., LTD 1.1 Business overview 1.2 Product lines of the company Kruger Vietnam 1.3 Company organization chart CHAPTER 2: LITERATURE REVIEW 10 2.1 Some basic concepts of quality 10 2.2 Some stastistical process control (SPC) tools 11 2.2.1 Flowchart 11 2.2.2 Cause – Effect Diagram 12 2.2.3 Pareto chart 13 2.2.4 Check sheet 14 2.3 Some methods applied in the process of finding the cause of the error 15 2.3.1 Delphi method 15 2.3.2 AHP method 16 CHAPTER 3: ANALYSIS OF THE CURRENT SITUATION OF QUALITY CONTROL OF TDA FANS AT KRUGER VIETNAM FACTORY 17 3.1 Overview of TDA - Direct driven tube axial fan 17 3.1.1 Application 17 3.1.2 Structure 18 vi