A
abhattacharya
Cpk for casting dimensions
We are manufacturing ductile iron castings and supplying to the automotive sector in India. We are in the process of implementing QS9000 systems.
In one of the castings, the customer has given us more than five critical dimensions for which we have to give the Cpk values with every lot. We find that getting CpK values > 1 for each critical dimension simultaneously is quite difficult for founding operations (We are using green sand process for manufacturing castings).
Are we to reject the castings even because one out of the five dimensions has CpK lower than one? What's the way out?
We are manufacturing ductile iron castings and supplying to the automotive sector in India. We are in the process of implementing QS9000 systems.
In one of the castings, the customer has given us more than five critical dimensions for which we have to give the Cpk values with every lot. We find that getting CpK values > 1 for each critical dimension simultaneously is quite difficult for founding operations (We are using green sand process for manufacturing castings).
Are we to reject the castings even because one out of the five dimensions has CpK lower than one? What's the way out?