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About CPK quality control related to several important concepts:
 
Process Data Process Data
LSL: Lower Specification Limit
Target: target
USL: Upper Specification Limit
Sample Mean: the sample mean
Sample & nbsp; N: number of samples
StDev (Within): deviation within the group
Deviation of the manufacturing process: StDev (Overall)
Observed Performance observing performance
 
PPM & nbsp; <& nbsp; LSL: Measurement results below the specification limit, every one million in number.
 
PPM & nbsp;> & nbsp; USL: Measurement results above the upper specification limit, every one million in number.
 
PPM & nbsp; Total: Measurement results below the specification limit and upper limit of the measurement result is higher than the total size of each one million in number.
 
Potential (Within) Capability potential team performance
 
Cp: ​​a potential process precision, the case of measuring the variation process tolerances and specifications of difference.
 
CPL: a potential process precision, measure process variation with the specifications of the tolerance range (near the lower limit of three times the standard deviation) difference of circumstances. & nbsp;
 
CPU: a potential process precision, measure process variation with the specifications of the tolerance range (three times near the upper limit of the standard deviation) difference of circumstances.
 
Cpk: a potential process capability index, its meaning differs from Cp, when the actual distribution center and the standard deviation center, but can not be adjusted or unnecessary adjustment, through amendments to the Cp is derived from the program to the system capability index.
 
CCpk: a potential process capability index, its meaning differs from Cpk, the situation is different tolerance variation process with the specifications of the time difference between the index for unilateral specifications.
 
Overall Capability actual process capability
 
Pp: a comprehensive process precision, tolerance variation measure the actual situation manifested process with the specifications of the difference of.
 
PPL: precision process is complete, measure the variation of the actual performance of the process out of the tolerance range and specifications (the lower limit is close to three times the standard deviation) of the difference between the situation.
 
PPU: is a comprehensive process precision, a measure of the variation of the actual performance of the process out of the specification tolerances (three times near the upper limit of the standard deviation) difference of circumstances.
 
Ppk: a comprehensive process capability index, its meaning differs from Pp, when the actual distribution center and the standard deviation center, but can not be adjusted or unnecessary adjustment, Pp is obtained through amendments to the program to the system capability index.


Many customers think that "Made in China" is the representative of cheap, low-quality, Actully it is not TURE, I can honestly tell you that it has too many misconceptions on the inside, for example, you are familiar with the iPhone or Samsung in China, you favorite sports shoes and clothes such as: Nike; Adiddas, are also manufactured in China, a beautiful IPAD or laptop on the table the most made ​​in China, whether you choose Dell, Hewlett-Packard and Acer, Lenover, you finally get the "Made in China . "Why they can choose "Made in China", you can still maintain a high quality, the only thing is that they found the right supplier, the right suppliers continue to provide top quality and price competitiveness, which is the most important reason, these famous brands very successful operation, and in the global market competitiveness,

 

 

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