KR20030016042A - process management system and operation method thereof - Google Patents

Abstract

PURPOSE: A process managing system and a method for managing the same are provided to maintain a manufacturing process of each accessory stably by monitoring a trouble of a process continuously through a quality confirmation. CONSTITUTION: A cooperated company server network(100) is constructed by a cooperated company which manufactures an accessory of a specific product, inputs each quality control data of an accessory manufactured in the cooperated company and data with respect to a manufacturing process of a corresponding accessory, and transmits the data by on-line. A database(200) stores information with respect to various kinds of accessories, an object standard deviation level information of each accessory according to manufacturing process items, quality and defective proportion information of each accessory, checking item information and checking result information according to each manufacturing process, etc. A process managing server network(300) is connected to the cooperated company server network(100) and the database(200) by on-line and includes a process verification unit(310) for judging an alarm notifying or not with respect to a manufacturing process of a corresponding accessory based on quality data with respect to each accessory inputted from the cooperated company server network(100).

Description

Process management system and operation method thereof

The present invention relates to a process control system, in particular through the quality control for each accessory of a particular product produced by each supplier can confirm the problem with the process of the accessory in advance and can notify the supplier. To a process control system and its operation method.

Companies that sell ordinary home appliances and the like do not directly produce all the accessories related to the products, and subcontract each of the many suppliers to each of them to supply each accessory, and then assemble and sell each of the supplied accessories.

For example, considering that there are a lot of accessories necessary for the configuration of the refrigerator, it is impossible for the vendor selling the refrigerator to manufacture all the accessories necessary for the configuration of the refrigerator by itself. To give.

Accordingly, the compatibility problem between each of the accessories has emerged as a very important matter, and manufacturers and product distributors of each accessory have to manage the accessory quality according to a predetermined specification through their own quality control.

However, despite the above-described quality control, it was not only difficult to timely carry out the detection of the cause of the failure of the accessory and the action according to the cause, but also to confirm the cause of the failure in advance. It was even harder to carry out the action.

In particular, in the past, only when a quality problem occurs, the cause of the problem was identified and solved, so the defect rate was high, and the manufacturing cost was high.

The present invention has been made to solve the various problems of the prior art as described above, by continuously monitoring whether the abnormality of the process through the quality check to ensure that the problem in the production process of each accessory in advance and to warn each accessory The purpose is to provide a process control system and its operation method to ensure that the process for the production of chlorine is always stable.

1 is a schematic view showing a process management system according to the present invention

2 is a flow chart briefly illustrating an operation process according to an embodiment of the process management system of the present invention.

3 is a flowchart briefly illustrating a first example according to a method of determining whether a manufacturing process is abnormal during an operation process of the process management system of the present invention.

4 is a flow chart briefly illustrating a second example according to a method of determining whether a manufacturing process is abnormal during an operation process of the process management system of the present invention.

5 is an example of a graph showing a trend of a capability value over a long period of time.

6 is a flowchart briefly illustrating a third example according to a method of determining whether a manufacturing process is abnormal during an operation process of the process management system of the present invention.

7 is a flowchart briefly illustrating a fourth example according to a method of determining whether a manufacturing process is abnormal during an operation process of the process management system of the present invention.

8 is an example of a graph showing an X bar-R control chart

9 is a flowchart briefly illustrating a fifth example according to a method of determining whether a manufacturing process is abnormal during an operation process of the process management system of the present invention.

10 is a flowchart briefly illustrating a sixth example according to a method of determining whether a manufacturing process is abnormal during an operation process of the process management system of the present invention.

11 is a flowchart briefly illustrating a first example according to a method of determining an organization of a process to be managed during the operation of the process management system of the present invention.

12 is a flowchart briefly illustrating a second example according to a method of determining an organization of a process to be managed during the operation of the process management system of the present invention.

13 is a flow chart briefly illustrating a third example according to a method of determining the organization of a process to be managed during the operation of the process management system of the present invention.

14 is a flowchart briefly illustrating an operation process according to another embodiment of the process management system of the present invention.

Explanation of symbols for the main parts of the drawings

100. Supplier's server network 200. Database

300. Server network for quality control 310. Notification unit

According to the process management system of the present invention for achieving the above object, it is established in each of the cooperative companies that manufacture the accessories of a specific product, and each quality control information data of the accessories manufactured by the cooperative company and the manufacturing process of the accessories A server network of a supplier for inputting information data and transmitting the information online; Information on various accessories, target standard deviation (σ) level information of each accessory by each manufacturing process item, quality and defect rate information of each accessory by the manufacturing process item, item information of the managed manufacturing process item, and distribution of each manufacturing process item. A database for storing information on factors causing change, inspection item information for each manufacturing process, inspection result information for each manufacturing process, variation history information for each manufacturing process, and the like; The server network and database of the supplier are interoperable with each other through an online network, and whether or not a warning is notified of the manufacturing process of the accessory based on the quality information data of each accessory inputted from the server network of the supplier. A server network for process control having a process verification unit for judging is included.

In addition, the method for operating the process management system of the present invention to achieve the above object comprises the steps of receiving quality inspection result data for a particular accessory manufactured through each manufacturing process of each supplier; Registering the input quality inspection result data in a database; Comparing the registered information with a quality inspection result for the same accessory previously registered in the database; If the result of the comparison is that the quality of the accessory is worse than the previously measured quality result, the step of notifying the server network of the supplier that there is a problem in the manufacturing process of the accessory: the operation proceeds sequentially have.

Another method of operating the process management system of the present invention for achieving the above object is the step of requesting the input of the changes of various information on the manufacturing process for each accessory through the server network of each supplier; Receiving information on a change in the manufacturing process and registering the change in a database for each accessory; Receiving quality test result data of accessories manufactured through the changed manufacturing process; Confirming, by the quality inspection result information, an item whose quality is deteriorated compared to the details of the existing quality inspection result information for the same accessory; Confirming whether the details of the deteriorated item of the accessory are related to a change in a corresponding manufacturing process; If it is determined that the quality deterioration of the accessory is due to a change in the manufacturing process, the step of notifying the server network of the partner company as a result of the determination thereof is characterized in that the operation proceeds sequentially.

Hereinafter, each embodiment of the present invention will be described in more detail with reference to FIGS. 1 to 14 as follows.

First, Figure 1 is a schematic diagram showing a process management system according to the present invention.

That is, the process management system of the present invention is largely connected to the server network 100 of the partner company, the database 200, and the server network for process management 300 through a variety of data communication networks such as the Internet or intranet. Present what you have built to operate.

In this case, the server network 100 of the supplier is an Internet-connected server operated by at least one supplier that manufactures each accessory related to a specific product, and each quality management information data of the accessory manufactured by the supplier is provided. And receiving information data on a manufacturing process of the accessory from a person in charge and transmitting the same to a server network 300 for process management.

The database 200 includes information on various accessories, target standard deviation (σ) level information of each accessory by each manufacturing process item, quality and defect rate information of each accessory by the manufacturing process item, and management target manufacturing process. At least one of item information, information on factors causing variation in dispersion of each manufacturing process item, inspection item information for each manufacturing process, inspection result information for each manufacturing process, and change history information for each manufacturing process, respectively Stores by category.

In addition, the process management server network 300 is operated in conjunction with the server network 100 and the database 200 of the partner company through an online network (particularly, the Internet network), the website for providing a service of the present invention Operate.

At this time, the process management server network 300 to determine whether or not a warning notification for the manufacturing process of the accessories based on the quality information data for each accessory input through the server network 100 of the partner company The process verification unit 310 is included and constructed.

The process verification unit 310 may not only be software for general statistical process control (SPC), but also may be constructed as a separate PC on which the software is installed.

And, in the above process management server network 300 and database 200 is built in the product sales company (or finished product producer) that receives each accessory manufactured by each partner, or the corresponding service on the Internet In consideration of being able to build in a separate service provider to provide, it is not necessarily limited to building in any one place, in the embodiment of the present invention, the server network 300 and the database 200 for process management sells products. It is suggested that it is included and operated in the network established in the company.

Hereinafter, with reference to the flowchart of Figures 2 to 5 showing the operation of an embodiment according to the process management system of the present invention described above in detail.

First, the server network 300 for process management constituting the process management system of the present invention is manufactured through the manufacturing process of each of the partner companies from the server network 100 of each partner connected through the Internet (or intranet) Receive continuous input of quality test result data for accessories.

At this time, the quality inspection result data input as described above is usually measured for each inspection item of the inspection report submitted before the delivery of the corresponding accessories, the data entered in the database 200 for each of the corresponding accessories Each is classified and stored for each manufacturing process.

As described above, the data stored in the database 200 is stored in the database 200 by the process verification unit 310 constituting the process management server network 300. Quality check result data is compared.

At this time, the quality inspection method for the particular accessory calculates the standard deviation (σ) of the accessory from the various measurement data for the accessory, and the calculated standard deviation is the capability value (also referred to as Z, or sigma value) In this case, the process capability value is determined by satisfying the degree of satisfying the target process capability value within a predetermined range and determining the quality result of the accessory according to the identified degree of satisfaction.

The calculation of the standard deviation for each accessory and the calculation of the capability value are performed by software for statistical process control (SPC) installed in the process verification unit.

In addition, the process management server network 300 compares the quality result value of the corresponding accessory determined by the above-described quality process and the quality result value of the same accessory previously measured, and the current quality result value. When it is worse than the existing quality result value, the manufacturing process of the corresponding accessory is checked, and after determining that there is a problem in the manufacturing process, the contents thereof are registered in the database 200.

This process, even if the quality test results for this accessory meets the pre-determined dimensions, the quality of the product has been continuously deteriorated compared to the previous, or suddenly deteriorated compared to the previous Considering this, if there is no change in each factor affecting other quality, it can be judged that the quality of the corresponding accessory is degraded by the change of manufacturing process (or a problem in manufacturing process). This is to solve the problem so that the quality of the accessory can be prevented in the future.

In order to confirm that there are problems in the manufacturing process in the above process, a method of performing comparison of each quality result may be provided in various ways.

Thus, the present invention provides the following six processes as an example of the method.

First, as shown in the flowchart of FIG. 3, the process management server network 300 confirms the capability level Z _bench for the corresponding accessory during a recent predetermined lot, and the current lot that has received the acceptance decision. After checking the capability value (Z) for the accessory of the product, and comparing each of the identified capability values, if the capability value (Z) of the current lot is lower than the existing capability value (Z _bench ), the corresponding accessory We present a method of determining that there is a problem in the manufacturing process.

This is a method to easily determine whether there is an abnormality in the manufacturing process according to the change in the capability value through the management of the capability value.

Second, as shown in the flowchart of FIG. 4 and the graph of FIG. 5, the process capability value (Zlt or Zst) is checked during the latest predetermined lot including the current lot of the corresponding accessory, and the identified capability capability value is determined by the predetermined lot. If it falls for a while, the method of determining that there is a problem in the manufacturing process of the accessory is presented.

This is a supplementary method to ensure that abnormality in the manufacturing process through the first method is identified in spite of the temporary fluctuation of the capability value. This is how we can judge more accurately.

Third, as shown in the flow chart of FIG. 6, the average capability value Zst of the accessories for each lot identified in the last short period and the average capability value Zlt of the accessories for each lot identified for the long term. If the difference is more than ± 2, provide a method for determining that there is a problem in the manufacturing process of the accessory.

This is a method to determine the abnormality of the manufacturing process more accurately by checking the difference in the average process capability value of the accessories for each lot continuously registered.

Fourth, X bar (lot average) is the upper limit of management by analyzing the X bar-R control chart, which is a control chart manufactured based on the quality result data of the accessory as shown in the flowchart of FIG. 7 and the graph of FIG. 8. If the control limit is exceeded, a method of determining that there is a problem in the manufacturing process of the accessory is presented.

Fifth, by analyzing the X bar-R control chart, which is a control chart manufactured based on the quality result data of the accessory as shown in the flowchart of FIG. 9, the continuous points of the X bar (lot average) are more than a predetermined number of center lines. If the bias is biased to one side, the method suggests a problem with the manufacturing process of the accessory.

Sixth, the analysis of the X bar-R control chart, which is a control chart produced based on the quality result data of the accessory as shown in the flowchart of FIG. 10, analyzes the consecutive points of the X bar (lot average) more than a predetermined number. If a trend is seen toward the Lower Control Limit (UCL) or Upper Control Limit (UCL), a method of determining that there is a problem in the manufacturing process of the accessory is presented.

The fourth, fifth, and sixth methods have the advantage of having high reliability as a method of confirming the abnormality of the manufacturing process using the X bar-R control chart.

Meanwhile, the present invention is not limited to determining whether there is an abnormality in the manufacturing process by using each of the above-described methods, and identifying the cause of the process management server network 300 to cause scatter in the manufacturing process of the accessory. When the quality of the accessories due to the cause of the dispersion is made, the process of determining that there is a problem in the manufacturing process for the accessories is further provided.

In this case, the cause of the dispersion may be due to a change of at least one item of 4M such as a man, a machine, a material, a method of work, and the like. .

That is, in the present invention, it is possible to confirm whether there is a problem in the manufacturing process based on the quality result of the corresponding accessory and at the same time to determine the cause of the scattering in the manufacturing process so as to check whether there is a problem in the manufacturing process so that more accurate judgment can be performed. Is to suggest.

The notification unit 310 constituting the server network 300 for process management notifies the server network 100 of the partner company with respect to the accessory determined to have a problem in the manufacturing process through the aforementioned processes. In addition, the contents are registered in the database 200.

At this time, the method of notifying the corresponding information to the server network 100 of the cooperative company may not only use a normal e-mail but also the server network 100 of the cooperative company connected to the server network 300 for process management. In this case, a method of notifying the above contents may be used, but the present invention suggests that the notification unit 310 is configured as a mail server to notify the corresponding details by electronic mail.

On the other hand, the information registered in the database 200 through the above process is used to perform the management of the manufacturing process that caused the degradation of the accessories.

However, considering that the manufacturing process may have caused the accessory to be deteriorated due to a minor mistake, not all of them can be designated as a controlled manufacturing process just because the quality of the accessory is deteriorated.

Therefore, the present invention further proposes that the method of designating the manufacturing process to be managed is performed through the following three methods.

First, as shown in the flow chart of FIG. 11, the number of accessory lots in which quality deterioration has been previously generated by the corresponding manufacturing process is checked, and a predetermined number of predetermined lots (for example, 6 lots) is determined. If it is exceeded, the relevant manufacturing process should be organized and designated as a controlled manufacturing process.

Of course, the fact that the organization has been organized through the above process should be notified to the relevant supplier.

Second, as shown in the flowchart of FIG. 12, the number of deterioration occurrences caused by the manufacturing process is continuously managed, and when the number of deterioration occurrences exceeds the preset number, the corresponding manufacturing process is organized into a target manufacturing process. To present.

That is, the total number of quality degradation occurrences for the manufacturing process is extracted by adding the current number of times to the number of quality degradation occurrences by the corresponding manufacturing process, which is already registered in the database 200, and then the extracted total quality degradation occurrence times. If the predetermined number of times (eg, six times) is exceeded, the corresponding manufacturing process is organized into a manufacturing process to be managed.

Third, as shown in the flowchart of FIG. 13, the quality deterioration occurrence history of the accessory by the corresponding manufacturing process registered in the database 200 is confirmed, and this confirmed quality deterioration occurrence history is a predetermined number of times (for example, three times). In case of continuous occurrence, it is suggested to designate the manufacturing process as a controlled manufacturing process.

On the other hand, the process management system according to the present invention may not necessarily be operated only by the process of the above-described embodiment.

That is, when the quality of a specific part of the accessory is degraded compared to the existing state in the state that the database of each factor of the manufacturing process affecting the quality of the accessory is confirmed, the problem of the manufacturing process is identified. It can also be read.

Accordingly, another embodiment of the present invention proposes an operation process of the process management system in consideration of the above matters, which will be described in more detail with reference to the flowchart of FIG. 14.

First, the configuration of the process management system according to another embodiment of the present invention is constructed while forming the same configuration as the overall process management system according to the embodiment of the present invention described above, the database 200 constituting the process management system Suggests that item information for each manufacturing process that directly affects the quality of each accessory is included and stored.

In other words, it provides data on certified information about factors affecting the quality of each accessory in each process so that it is easy to determine that variations in a particular manufacturing process are directly related to the quality of each type of accessory manufactured through that manufacturing process. It is registered in advance in the base 200, and continuously receives and updates a variety of information about the factor.

In this state, the process management server network 300 constituting the process management system continuously obtains changes in various information on the manufacturing process for each accessory through the network 100 of each supplier.

This means that if a change occurs in a manufacturing process that directly affects the quality of the accessory at a particular supplier, the person in charge of the manufacturing process of the supplier or the manager who manages the network of the supplier 100 Is performed by accessing the process management server network 300 through the network of the partner company and input the corresponding details through the interface.

At this time, the change of various information about the manufacturing process is the minimum among 4M such as Man, Machine, Material, Method, etc., which causes dispersion in the manufacturing process. This item contains either item.

When the input of information on the changes of the various manufacturing processes through the above-described process is completed, the server network 300 for process management acquires the various types of inputted information and classifies the information into the corresponding accessories and registers them in the database 200. .

In addition, the process management server network 300 receives the quality inspection result data of the accessories manufactured through the changed manufacturing process, the quality inspection result data is compared with the details of the quality inspection result information for the same existing accessories Check the degraded item.

At this time, if there is a corresponding accessory through the above checking process, the details (for example, when the error range of the dimension becomes large) of the item of which the quality of the accessory is degraded are checked.

If the checked details are related to a change in the manufacturing process (for example, a change in the cutting material of the cutting work), it is determined that the quality deterioration of the accessory is due to the change in the manufacturing process, and the resulting information of the supplier The network 100 is notified and stored in the database 200.

In the above process, the method of performing the quality inspection of each accessory and the method of organizing each manufacturing process for management are presented in the same manner as the above-described embodiment of the present invention, and a detailed description thereof will be omitted. do.

On the other hand, the process management server network constituting the process management system of the present invention as described above does not necessarily need to be built in a specific product distributor, a separate service provider to build the quality control system online, this quality The network of product distributors using various accessories produced by each partner in the management system can be connected and operated, and the server network for process management is established by a specific product vendor. It can be said to be a useful invention, such that it can be operated to share the quality management information about the server network of each affiliated company that receives and uses the same accessories produced from each partner company.

According to the process management system and its operation method according to the present invention as described above, by continuously monitoring whether or not the process through the quality check in order to confirm and warn problems in advance of the production process of each accessory The advantage is that the process for the production of each accessory can always be kept stable.

In addition, the present invention has the advantage that the defective rate for the finished product can also be reduced through the manufacturing process management of each of the cooperative companies described above.

Claims (22)

A server network of a supplier, which is established at each supplier manufacturing accessories of a specific product, and inputs and transmits online quality control information data of the accessories manufactured by the supplier and information data on the manufacturing process of the accessory; ; Information on various accessories, target standard deviation (σ) level information of each accessory by each manufacturing process item, quality and defect rate information of each accessory by the manufacturing process item, item information of the managed manufacturing process item, and distribution of each manufacturing process item. A database for storing information on factors causing change, inspection item information for each manufacturing process, inspection result information for each manufacturing process, variation history information for each manufacturing process, and the like; The server network and database of the supplier are interoperable with each other through an online network, and whether or not a warning is notified of the manufacturing process of the accessory based on the quality information data of each accessory inputted from the server network of the supplier. A process management system, comprising: a server network for process control having a process verification unit for judging. The method of claim 1, The database has Process control system, characterized in that the item information for each manufacturing process that directly affects the performance of each accessory is further included and stored. The method of claim 1, Server network for process control And a notification unit for notifying a server network of a corresponding supplier when a warning notification history for a specific manufacturing process is generated. Receiving quality test result data for a specific accessory manufactured through each manufacturing process of each supplier; Registering the input quality inspection result data in a database; Comparing the registered information with a quality inspection result for the same accessory previously registered in the database; If the quality of the accessory is worse than the previously measured quality result as a result of the comparison, notifying the server network of the supplier that there is a problem in the manufacturing process of the accessory: a process management comprising: How the system works. The method of claim 4, wherein How to check the quality of a particular accessory When the standard deviation (σ) of the corresponding accessory is calculated from the various measurement data for the accessory, and the calculated standard deviation is expressed as the capability value (Z, sigma value), the target process value is set in advance. And verifying the degree of satisfaction within the range of the capability value, and determining the quality result of the corresponding accessory according to the identified degree of satisfaction. The method of claim 4, wherein The process of performing a comparison of each quality result to confirm that there are problems with the manufacturing process of the accessory Identifying a process capability value (Z _bench ) for that accessory during the most recent predetermined lot; Confirming a process capability value (Z) for the accessories of the current lot that received the pass determination; Comparing each capability value with each other, if the capability value of the current lot is lower than the existing capability value, determining that there is a problem in the manufacturing process of the accessory: a process management comprising: How the system works. The method of claim 4, wherein The process of comparing each quality result to confirm that there are problems with the manufacturing process of the accessory Identifying a capability value (Z) during a recent predetermined lot including the current lot of the accessory; Determining that there is a problem in the manufacturing process of the accessory when the process capability value falls continuously for a predetermined lot: operating method of the process management system, characterized in that proceeded by including. The method of claim 4, wherein The process of performing a comparison of each quality result to confirm that there are problems with the manufacturing process of the accessory Manufacture of the accessory when the difference between the average capability value (Zst) of the accessory by each lot identified in the last short period and the average capability value (Zlt) of the accessory by lot identified during the long term is 2 or more A method of operating a process management system, characterized in that the process proceeds by including a step of determining that there is a problem in the process. The method of claim 4, wherein The process of performing a comparison of each quality result to confirm that there are problems with the manufacturing process of the accessory Analyze the X bar-R control chart, which is a control chart created based on the quality result data of the accessory, and if the X bar (lot average) exceeds the upper control limit (UCL), there is a problem in the manufacturing process of the accessory. A method of operating a process management system, characterized in that the process is carried out by including the step of determining. The method of claim 4, wherein The process of performing a comparison of each quality result to confirm that there are problems with the manufacturing process of the accessory Analyze the X bar-R control chart, which is a control chart created based on the quality result data of the accessory, and determines whether the consecutive points of the X bar (lot average) are more than a certain number of points on the center line (center line or total average line). If it is biased by the operation method of the process management system, characterized in that it proceeds by operating including the step of determining that there is a problem in the manufacturing process of the accessory. The method of claim 4, wherein The process of performing a comparison of each quality result to confirm that there are problems with the manufacturing process of the accessory Analyze the X bar-R control chart, which is a control chart created based on the quality result data of the accessory, to control the lower control limit (LCL) or upper control limit (LCL) over a certain number of consecutive points of the X bar (lot average). And a step of determining that there is a problem in the manufacturing process of the accessory when the trend is toward the upper control limit (UCL). The method of claim 4, wherein Before deciding that there is a problem in the manufacturing process of the accessory, the step of identifying the cause of dispersion in the manufacturing process of the accessory and if the quality of the accessory is deteriorated by this cause is determined that there is a problem in the manufacturing process of the accessory. Operation method of a process control system characterized in that it is further included. The method of claim 12, The cause of dispersion in the manufacturing process is Method of operating a process management system, characterized in that by changing at least one item of 4M, such as Man (Man), Machine (Materine), Material (Material), Method of Work (Method). The method of claim 4, wherein The method of operating the process control system, characterized in that it further comprises the step of registering in the database the fact that the quality of a particular accessory by a particular manufacturing process. The method of claim 14, Identifying the number of lots that had previously been deteriorated by the manufacturing process; When the number of the identified lot exceeds a predetermined lot, the step of organizing the manufacturing process into a controlled manufacturing process: the operation method of the process management system, characterized in that the operation is further included. The method of claim 14, Extracting the total number of deterioration occurrences of the manufacturing process by adding the number of deterioration occurrences due to the manufacturing process; And organizing the manufacturing process into a management target manufacturing process when the total number of extracted quality degradation occurrences exceeds a predetermined number of times. The method of claim 14, Confirming a breakdown of the quality of the accessory by the manufacturing process registered in the database; And operating the manufacturing process as a manufacturing process to be managed when the identified quality degradation occurrences occur more than a predetermined number of times in succession. Requesting input of changes in various information on a manufacturing process for each accessory through a server network of each supplier; Receiving information on a change in the manufacturing process and registering the change in a database for each accessory; Receiving quality test result data of accessories manufactured through the changed manufacturing process; Confirming, by the quality inspection result information, an item whose quality is deteriorated compared to the details of the existing quality inspection result information for the same accessory; Confirming whether the details of the deteriorated item of the accessory are related to a change in a corresponding manufacturing process; If it is determined that the quality degradation of the accessory is due to a change in the manufacturing process, notifying the server network of the partner company as a result of the determination thereof; The method of claim 18, Changes in information on the manufacturing process Process management system characterized in that it includes at least any one of 4M items such as Man, Machine, Material, Method, etc., which causes dispersion in the manufacturing process. Operating method. The method of claim 18, How to perform a quality check on your accessories When the standard deviation (σ) of the corresponding accessory is calculated from the various measurement data for the accessory, and the calculated standard deviation is expressed as the capability value (Z), the capability value is determined by the target capability value. Checking the degree of satisfaction within the range, and determining the quality result of the accessory according to the identified degree of satisfaction. The method of claim 18, To determine that variations in a particular manufacturing process are directly related to the quality of each type of accessory manufactured through that manufacturing process. Method of operating a process management system, characterized in that it further includes the step of registering in advance in the database the certified information on the factors affecting the quality of the corresponding accessories for each process, and continuously updating the information of additional factors . The method of claim 18, When it is judged that the deterioration of the accessories is caused by the variation of the manufacturing process Identifying the number of lots that had previously been deteriorated by the manufacturing process; When the number of the identified lots exceeds a predetermined lot, organizing the manufacturing process into a controlled manufacturing process.