SQC is the application of statistical techniques to accept or reject products already produced or to control the process and therefore product quality while the part is being made.
Statistics is the collection ,organization ,analysis ,interpretation and presentation of data.
SQC consists of the following activities:
1)Systematic collection and graphic recording of the accurate data.
2)Analysis of data
3)practical engineering and management action,if the information obtained indicates significant deviation from the specified limits.
SQC is the application of statistical techniques to determine how far the products conforms to the standards of quality and to what extent quality deviates from the standard quality.
Importance /Benefits of SQC
It Saves on rejection
Maintains high standards of quality
Reduced expenses of inspection
Ensures standard prices
Feelings of responsibility among workers
Time and cost of inspection is reduced
Product design can be improved
SQC decides the correct methods of inspections
INSPECTION
Inspection is an appraisal activity that compares goods or services to a standard.
Inspection can occur at three points :
Before production
During production
After production
Where to inspect in the process
Raw materials, finished goods,before a costly operation,before an irreversible process,before a covering process.
Acceptance sampling : Inspection before and after production often involves acceptance sampling procedures.
Process control : monitoring during the production process is referred to as process control.
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