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Five quality management tools you deserve

Quality management five tools, also known as quality control five tools


  1. statistical process control (SPC:Statistical, ProcessControl);
  2. measuring system analysis (MSA:Measure, System, Analyse);
  3. failure mode and effect analysis (FMEA:Failure, Mode, &Effct, Analyse);
  4. product quality planning (APQP:Advanced ProductQuality Planning);
  5. production parts approval process (PPAP:Production PartApproval Process)


The role and purpose of the five tools

1, statistical process control (SPC)

SPC is a manufacturing control method is to control the project in manufacturing, according to the characteristics of data collection, through the standard analysis and process capability of anomaly in the process of excavation, and take immediate measures to improve the method, return to normal.

The purpose of implementing SPC:

Make a reliable assessment of the process;

Determine the statistical control limits of the process, determine whether the process is out of control and whether the process is competent;

Provide an early warning system for the process and monitor the process in a timely manner to prevent the occurrence of waste products;

Reduced dependence on routine inspection, regular observation, and systematic measurement methods replace a large number of inspection and verification efforts

2, measurement system analysis (MSA)

Measurement system analysis (MSA) is the analysis of a measurement system where each part can be read repeatedly to assess the quality of the measurement system and to determine the acceptability of the data produced by the measurement system

The purpose of implementing MSA:

Understand the measurement process, determine the total amount of error in the measurement process, and assess the adequacy of the measurement systems used in production and process control,.MSA, facilitate understanding and improvement (reduce variability)

In daily production, we often according to the measurement data processing components obtained to analyze the status of the process, change ability and monitoring process; then, how to ensure that the results of the analysis are correct? We must be from two aspects to ensure:

(1) to ensure the accuracy / quality of measurement data, and to use the measurement system analysis (MSA) method to evaluate the measurement system for obtaining measurement data;

(2) is to ensure that the use of appropriate methods of data analysis, such as the use of SPC tools, test design, variance analysis, regression analysis and other analysis methods. MSA uses mathematical statistics and charts on the resolution of the measurement system and the error in resolution and error evaluation measurement system for the parameter being measured is appropriate, and to determine the main components of measurement system error.

3, failure mode and effect analysis (FMEA)

The potential failure mode and effects analysis (FMEA) as a tool for planning preventive measures, the purpose of which is to find, evaluation of failure and consequence of product / process potential; find can avoid or reduce potential failure measures and continue to improve.

The purpose of implementing FMEA:

A crisis that can be easily modified or reduced locally to modify a product or process, thereby reducing the risk of hindsight

Find ways to avoid or reduce these potential failures;

4, product quality planning (APQP)

APQP is a structured method for determining and formulating steps needed to ensure that a product meets customer requirements

The function of APQP:

In order to meet the requirements of product, project or contract, before the investment of new products, to confirm and develop a structured approach to the production process of a specific product or series of products to make customer satisfaction. To provide guidance for the formulation of product quality plan, to support the development of customer satisfaction of products or services.

5, production parts approval process (PPAP)

The production part approval process is a practical technology that aims to verify that the products manufactured by the process and the process are up to the technical requirements before the first shipment

The purpose of implementing PPAP:

Determine whether the supplier has correctly understood all requirements for customer engineering design records and specifications

And, in the actual production process under the required production cycle conditions, has the potential to continue to meet these requirements

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