质量管理七大手法wurooney.pptx

QC 7 Tools What is 7 tools?Check sheetLevel diagramHistogramPareto diagramCause-and-effect diagramScatter diagramControl chart Importance of 7 toolsWhy “MADE IN JAPAN” --- Automobile, electronic, chemical, exactitude equipment, etc.The concept “QC 7 tools” is raised by Kaoru Ishikawa.“QC 7 tools” played an important part in Japan’s economic recovery and development. QC 7 Tools --- Check SheetWhat is check sheet?A table which lists out all items need checking.Check sheet includes, but not limited to: diagnoses, questionnaire, record, statistics, etc. Check Sheet --- Key pointsKey points:1. Verify the items to check;2. Verify the frequency to check;3. Verify the personnel to check. Implement procedure1. Verify the object;2. Frame the check sheet;3. Check and record;4. Request a improvement aiming at the NC items5. Verify the improvement6. Summarize periodically and improve persistently. Level DiagramWhat is level diagram?Sort all opinions, views or thoughts by specific topic and group the collected data or information. Implement procedure1. Identify the topic to study;2. Frame the level diagram and collect data;3. Sort the data to various levels;4. Analyze the data. QC 7 Tools --- HistogramWhat is histogram?A histogram is a simple frequency distribution. It is a plot of the actual data showing the data values versus the number of occurrences for each value. Judge the Process Capability (Cp) from the histogramCp is just OKCp is better than specCp is lean to leftCp is lean to rightToo scattered Cp Implement Procedure1. Collect data; For example: Gear dimension produced by ABC factory as below; specification of this gear is 24.5±6mm:1234567891022.123.422.627.722.923.724.521.324.721.225.824.523.221.321.624.124.817.421.920.323.924.624.322.724.626.730.026.023.124.622.821.822.624.025.122.419.323.923.621.525.023.624.924.826.423.926.618.323.225.321.725.023.521.724.327.229.025.023.822.322.228.024.621.625.224.826.727.628.525.824.625.322.527.525.524.824.623.818.819.925.124.82