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Quality management process
Quality Control Process
Quality Control Process
 
Manufacturing Process Control Items and Quality Characteristics Controlling
Control Items Check Point Methods Number of Test
1. Material Receiving        
2. Incoming Inspection 1) Mill Certificate eview
2) Dimension &Surface
  1) Dimension Inspection
2) Visual Inspection
Each heat &
Each bundle
3. Drawing 1) Reduction ratio
2) Dies &Plug
3) Dimension
1) Drawing Speed
2) Outside, thickness
3) Surface
1) Manufacturing
    standard
2) Measuring by
    micrometer
3) Visual Inspection
At any time
4. Annealing Homogeneity of
the heat affected zone
1) Annealing    
    temperature
2) Hold time
Manufacturing standard At any time
5. Straightening Dimension Straightness Manufacturing standard
and Visual inspection
Every working turn
6. Cutting Dimension Length Measuring by tape
measure
At any time
7. End facing Dimension Bevel angle Manufacturing standard Every working turn
8. Pickling Surface   Visual Inspection At any time
9. Eddy current test Soundness of the tube 1) Frequency
2) Sensitivity
3) Phase
4) Search coil
Manufacturing standard
and specification
Each tube
10. Hydro test Soundness of the tube 1) Test pressure
2) Holding time
Manufacturing standard
and specification
Each tube
11. Final inspection 1) Dimension
2) Mechanical properties
1) Outside diameter,
    thickness &length
2) Tensile test
3) Hardness test
4) Others
1) Measuring by
    micrometer and tape
    measure
2) Measuring by
    related spec.
Each lot
12. Packing   1) Packing state
2) Shipping mark
Manufacturing standard  
 
 
 
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