control chart - Fayoum University Faculty of Engineering...

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Presented to: Dr. Mohammed Fahmy. Presented by: 1- Ahmed Hamdy Salem. 2- Ahmed Aly Dorgham. 3- Diaa Abd El Rahman Yossef. 4- Mahmoud Ibrahim Labib. 5- Mostafa Fikry Ahmed. Fayoum University Faculty of Engineering Industrial Engineering Department Control Charts Control Charts 3 rd Year 3 rd Year
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Statistical Quality Control Process Control Acceptan ce Sampling Variable s Charts Attribute s Charts Types of Statistical Quality Control
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Control Charts Control Chart
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Is A statistical tool to determine if a process is in control .
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Why Use Control charts?
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Reasons for using Control Charts Improve productivity Make defects visible Determine what process adjustments need to be made Determine if process is “in” or “out of control
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How Will Using Control Charts help your Company? Possible Goals when using Control Charts in your Company: Line reengineering Increased Employee motivation Continually improve of your process Increased profits Zero defects
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Control Chart Key Terms Out of Control : the process may not performing correctly In Control : the process may be performing correctly UCL : upper control limit LCL : lower control limit Average value : average
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A Process Is in Control If … 1. … no sample points outside limits 2. … most points near process average 3. … about equal number of points above and below centerline 4. … points appear randomly distributed
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Process is OUT of control if: One or multiple points outside the control limits Eight points in a row above the average value Multiple points in a row near the control limits
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Control Chart Types Control Charts R Chart Variables Charts Attributes Charts X Chart P Chart C Chart Continuous Numerical Data Categorical or Discrete Numerical Data
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Quality Measures Attribute a product characteristic that can be evaluated with a discrete response good – bad; yes - no Variable a product characteristic that is continuous and can be measured weight - length
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p charts: proportion of units nonconforming. np charts: number of units nonconforming. c charts: count of nonconformities. u charts: count of nonconformities per unit. Control Charts for Variables Data X and R charts: for sample averages and ranges. Md and R charts: for sample medians and ranges. X and s charts: for sample means and standard deviations. X charts: for individual measures; uses moving ranges. Types of Control Charts Control Charts for Attributes Data
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Attribute Control Charts Control charts that factor in the quality attributes of a process to determine if the process is performing in or out of control.
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Type of Attribute Charts p charts This chart shows the fraction of nonconforming or defective product produced by a manufacturing process.
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