统计过程控制 SPC英文版.pdf

STATISTICAL PROCESS
CONTROL
WC)
REFERENCE MANUAL
Issued 1992, Second Printing March 1995 (new cover only)
Copyright0 1992,O 1995
Chrysler Corporation, Ford pany, and General Motors Corporation
Selection Procedure for the Use of the Control Charts
Described in This Manual
DETERMINE CHARACTERISTIC
TO BE CHARTED
NONCONFORMlTlES
YES
CONDUCIVE TO
SUBGROUP SAMPLING
- ., CHEMICAL
YES
USE CHART FOR
INDIVIDUALS: X-MR
Note: This chart assumes the meas-
urement system has been assessed
and is appropriate
FOREWORD
This Reference Manual was prepared by the quality and supplier assessment staffs at Chrysler, Ford and
General Motors, working under the auspices of the Automotive Division of the American Society for Quality
Control Supplier Quality Requirements Task Force, in collaboration with the Automotive Industry Action
Group.
The ASQCIAIAG Task Force charter is to standardize the reference manuals, reporting formats and
technical nomenclature used by Chrysler, Ford and General Motors in their respective supplier assessment
systems: Supplier Quality Assurance, Total Quality Excellence and Targets for Excellence. Accordingly, this
Reference Manual can be used by any supplier to develop information responding to the requirements of
either Chrysler’s, Ford’s or General Motors’ supplier assessment systems.
Until now, there has been no unified formal approach in the automotive industry on statistical process
control. Certain manufacturers provided methods for their suppliers, while others had no specific
requirements. In an effort to simplify and minimize variation in supplier quality requirements, Chrysler,
Ford, and General Motors agreed to develop and, through AIAG, distribute this manual. The work team
responsible for the Manual’s content was led by Leonard A. Brown of General Motors.
The manual should be considered an introduction to statistical process control. It is not intended to limit
evolution of statistical methods