MINISTRY OF EDUCATION AND TRAINING HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY AND EDUCATION GRADUATION THESIS INDUSTRIAL MANAGEMENT APPLYING THE 8D METHOD - ENHANCING QUALITY CONTROL EFFECTIVENESS IN THE LOOPLINE AT HCP FACTORY OF BOSCH VIETNAM CO. TRUONG VAN NAM STUDENT: BUI NHU NGOC SKL012383 Ho Chi Minh City, November 2023 MINISTRY OF EDUCATION HO CHI MINH UNIVERSITY OF TECHNOLOGY AND EDUCATION FACULTY OF ECONOMICS GRADUATION THESIS APPLYING THE 8D METHOD - ENHANCING QUALITY CONTROL EFFECTIVENESS IN THE LOOPLINE AT HCP FACTORY OF BOSCH VIETNAM CO. Student : Bui Nhu Ngoc Student ID : 20124386 Course : 2020 Major : Industrial Management Instructor : MBA. Truong Van Nam Ho Chi Minh City, November 2023 1 COMMENTS OF ADVISOR -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- Ho Chi Minh City, 5th November, 2023 Advisor MBA.
Truong Van Nam i COMMENTS OF REVIEWER -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------- Ho Chi Minh City, 5th November, 2023 Reviewer ii ACKNOWLEDGEMENTS First and foremost, the author would like to express heartfelt gratitude to all the professors and lecturers in the Faculty of Economics at Ho Chi Minh City University of Technology and Education who enthusiastically imparted knowledge and provided support throughout the author's time studying at the university. The sincere contributions from these esteemed teachers have laid a crucial foundation of knowledge for the author, aiding in the research process and the completion of the thesis. Additionally, I wish to express my gratitude for the wholehearted support and guidance provided by the engineers at the TEF department, especially the TEF 3. Throughout my internship at Bosch Vietnam, it afforded me the chance to acquire and broaden my knowledge, enhance my skills, and gain practical experience in a professional environment teeming with creativity and dynamism.
This opportunity has enabled me to bridge the divide between theoretical concepts and practical applications, prompting me to reevaluate the academic knowledge I've gained while gaining valuable insights into how it is applied in practice. Particularly, the author wishes to extend deep gratitude to Mr. Truong Van Nam, who allocated time for guidance and provided invaluable advice that greatly contributed not only to this graduation thesis but also to the understanding and enhancement of future knowledge on the author's career path. The author acknowledges their limitations in terms of expertise and practical experience, which may lead to potential errors in the thesis.
The author sincerely hopes for input and guidance from the professors to refine and further develop their research direction in the future. Lastly, the author sends well wishes of health and prosperity to the entire company, esteemed colleagues, and professors. Sincere gratitude is sincerely expressed! Ho Chi Minh City, 5th November, 2023 Student Bui Nhu Ngoc iii LIST OF ABBREVIATIONS ABBREVIATIONS DEFINITIONS 8D Eight Disciplines Co. Ltd Limited company HcP Ho Chi Minh City Plant LL10 Loopline 10 PC Commercial Plant Management PT Technical Plant Management CTG Controlling HRL Human Resources FCM Facility Management HSE Health Safety Environment MFG Manufacturing LOG Logistics QMM Quality Management and Method ETC Engineering Technology Center PQA Purchasing Quality Assurance ICO Information Coordination & Organization CVT Continuously Variable Transmission IATF International Automotive Task Force SAP System Applications and Products TRC Technical Root Cause MRC Managerial Root Cause QC Quality Control Technical Committee 176 of the International ISO/TC 176 Organization for Standardization (ISO) iv LIST OF TABLES Table i: Production results according to plan from April to July, 2023.
1: Detailed description of the process. 2: Common issues and remedies in Laser Cutting. 3: Common defects in the LEM stage. 4: Common defects and solutions in the Ring Washing stage.
5: Common defects in the Rolling stage. 6: Process for loop inspection after Loop Washing. 7: Common defects and remedies in Loop Washing stage. 8: Standard rejection for the Loop Annealing.
9: Common defects and remedies in the SQC stage. 10: Production output and reject rate statistics from March to July 2023. 11: Number of defects in each stage. 12: Defects corresponding to each type of defect in July.
14: Number of loopline 10 downtime incidents in July. 1: Members of project. 2: Summary of yellow defect locations. 3: Frequency statistics of defect locations.
4 Is/Is Not analysis table for addressing yellow spot on Loopline 10. 5: Frequency statistics of causes for yellow defects in products. 6: Details of the loop inspection process for hypothesis 1. 7: Results of loopset inspection at various positions in the stage.
8: 5 Whys to find the root cause of yellow defects in the loopset. 9: Progress and effectiveness monitoring table for corrective actions. 1: Members of project. 10: Is/Is not analysis table for analyzing the encountered issue.
11: Summary of root causes for white defects. 12: 5xWhys question for white defects on the loopset. 13: Corrective actions for each root cause. 14: Progress monitoring and effectiveness tracking for corrective actions.
15: Preventive actions for each root cause. 16: Area designation based on color standards. 17: Color standards for labels. 18: Maintenance form for machines .78 vi LIST OF FIGURES Figure 1.
2: Overview of Bosch Factory in Long Thanh. 3: Company Organizational Chart. 4: Continuous Variable Transmission (CVT) pushbelt. 5: Some of Bosch's customers.
1: Benefit of 8D method brings to organizations. 2: The 8D problem solving method process. 5: Is/Is not tool and question for describing the problem. 7: TRC and MRC.
8: Flowchart basic symbols. 9: Plan - Do – Check – Act process. 1: The structure of a CVT pushbelt. 2: Operating principle of pushbelt.
3: Pushbelt production diagram. 4: Overview of the loopset production steps. 5: The loopset production process. 6: Input material inspection flowchart.
7: Operator inspect the quality of steel coils. 8: Gap Measuring Machine along the pipe's edge. 9: Steps in the Ring Washing stage. 10: Chart illustrates defect rate by month.
11: Pareto chart illustrates the high-defect-generating stages. 12: Pareto chart illustrates the defects occurring in the Facet stage. 1: Timeline for project. 2: Pareto chart for the locations of defects.
3: A fishbone diagram identifies the causes of yellow spots. 4: Pareto chart of product defects. 5: Identification of high-risk areas for defects. 6: Branch of the first hypothesis causes yellow defects on the loop.
7: Causal diagram branch for yellow defects in hypothesis 2. 8: Components of Sorting and the locations for loopset inspection. 9: Timeline for project. 10: White defect on the loop surface.
11: The stopper button on the edge of the cover. 12: Floor marking distance regulations. 13: Expandable label for the cart, board .77 viii TABLE OF CONTENTS COMMENTS OF ADVISOR.i COMMENTS OF REVIEWER. ii LIST OF ABBREVIATIONS .iv LIST OF TABLES .v LIST OF FIGURES.
vii TABLE OF CONTENTS. Research Subject and Scope. Structure of Study .3 CHAPTER 1: BOSCH VIETNAM COMPANY LIMITED INTRODUCTION .1 Overview of Robert Bosch GmbH Corporation .2 Overview of Bosch Vietnam Co.1 Introduction to Bosch Vietnam .2 Vision and Mission .3 Introduction to organizational structure .4 Product Business Characteristics .10 CHAPTER 2: LITERATURE REVIEW.1 Overview of quality .1 Definition of quality .2 Definition of quality management .3 Quality management methods .2 The 8D problem solving method .4 The 8D problem solving process .3 Related concepts of the study .3 Is/Is not method .5 TRC and MRC .23 CHAPTER 3: QUALITY CONTROL IN THE LOOPLINE - HCP FACTORY.1 Product information and production process .1 Introduction to CVT pushbelts .2 Loopset production process .2 Process of loopset quality control.1 Incoming materials quality control. Quality control each stage of the loopset production process at LL10 .3 The quality control results at Loopline 10.4 Factors affecting quality control at Loopline .3 Machinery and Equipment .5 Assessment of the current situation at the loopline .2 Limitations and Causes .51 CHAPTER 4: ENHANCING THE EFFECTIVENESS OF QUALITY CONTROL IN THE LOOPLINE - HCP FACTORY .1 Applying the 8D method to identify the root causes of yellow defects on loopsets .3D2_Describing the Problem .4 D3_Defining containment actions .5 D4_Finding the Root Cause .6 D5: Defining corrective actions and proving effectiveness .7 D6: Implementing corrective actions and tracking effectiveness .8 D7: Establishing preventive actions.2 Applying the 8D method to identify the root cause of white defects on the loopset.2 D2_ Describing the Problem .3 D3_ Defining containment actions .4 D4_ Finding the Root Cause .5 D5: Defining corrective actions and proving effectiveness .6 D6: Implementing corrective actions and tracking effectiveness .7 D7: Establishing preventive actions .3 Suggestion to enhance quality control efficiency in the loopline .2 Perfecting the 5s implementation at the factory .3 Improving machine maintenance and service operations solutions .82 Appendix 1: Steel coil inspection criteria .82 Appendix 2: Identified Chemical Components .82 Appendix 3: Steel Coil Production Process.
Rationale In an increasingly competitive period of economic globalization, the quality of products and services will define success or failure. Businesses are currently focused on ensuring high production, product quality, low prices, and enhanced profitability. To do this, organizations must painstakingly and properly execute the assembly line manufacturing process at each level, ensuring compliance with standards and eliminating product defects, hence avoiding the need for rework during production. It is critical to use the 8D approach to assess and resolve difficulties and incidents during the manufacturing process.
This allows the organization to precisely identify and treat the fundamental causes of problems, as well as provide effective solutions. During my past 6-month internship at the HcP factory, Bosch Vietnam Co., this factory specialized in producing the CTV pushbelts at Bosch. The pushbelts are composed of elements and loopsets. The main materials come from specialized steel coils to ensure meeting customer output standards.
To achieve this, each process in the loopset and element production line must operate optimally and steadily, with the number of defects minimized. During the internship, the author had exposure to the Loopset production line and observed a relatively high occurrence of product defects in looplines. According to production statistics from the Loopset production department: Table i: Production results according to plan from April to July, 2023 April May Jun July Output % Output % Output % Output % LL9 1,040,580 87% 1,143,760 95% 1,150,530 96% 1,240,520 103% LL10 1,089,790 91% 1,131,150 94% 1,120,010 93% 1,100,420 92% LL11 1,159,240 97% 1,252,580 104% 1,340,010 112% 1,230,590 103% (Source: Loopset production department) As shown in the table above, the production lines are not yet truly stable, and they do not achieve the specified percentage of production according to the plan. Consequently, it requires additional time for rework to prevent a significant drop in production output.
This situation has led to an increase in raw material costs and labor costs for overtime production and has a noticeable impact on the production schedule and company 1 revenue. Given this situation, identifying the root causes of the productivity decline is of utmost importance. From the identified issues at the factory, the author chose the topic "Applying the 8D method: Enhancing quality control effectiveness in the Loopline at HcP Factory of Bosch Vietnam Co." for the purpose of research and the completion of the graduation thesis. Research Objective Analyse the causes of product defects in the Loopset production line at HcP Factory, Bosch Vietnam Co.
Applying the 8D method is an effective way to identify the root causes of product defects and address them systematically to prevent future occurrences. Propose solutions to minimize product defects during the Loopset production process of Bosch Vietnam Co.