To ensure the successful implementation of the SPC, enterprises should pay attention to the following aspects: In more SPC professional problems in Guangzhou Taiyou SPC Online The understanding and importance of management n Poor quality is caused by poor quality or irresponsibility of relevant staff. In fact, if advanced quality management technology and tools are adopted, the quality can be improved significantly under the circumstances that the original conditions are unchanged. SPC is such a effective tool. At the same time, the support of management must be obtained at all stages of the SPC. If training is required in the initial stage of the SPC, this requires funds and time, and management coordination arrangements are required. In the implementation process, some processes need to be adjusted, and some even change processes, replacement equipment, etc. These require the support and recognition of management. Therefore, the implementation of SPCs is very important for management and attention. In more SPC professional issues in Guangzhou Taiyou SPC Online
In enhanced training The pre -SPC training for relevant personnel is an important prerequisite for implementing SPC, because SPC is based on mathematical statistics The management method based on the theory of probability theory must have a certain theoretical basis in the production process. The training can be selected and sent to the external training units to participate in the training. If possible, the training institution should be invited to the factory to train. On the one hand, the number of people can increase the number of trainers. On the other hand, the training content can be more in line with the factory’s Actually, improve the training effect.
The importance of data The implementation of SPC itself is a quantitative management. The quality of the data is very important. Action. There are two main aspects that affect the quality of data. On the one hand, the impact of the system is measured, and on the other hand, it is a man -made influence of data and calculation. For the impact of the measurement system, we must regularly analyze the system to confirm whether our measurement system is available, so as to ensure our data quality and minimize human mistakes at the same time.
The professional SPC software In the implementation of the SPC process, because it is necessary to use a large amount of data, at the same time calculate these data, and analyze it with a variety of statistical methods. The middle ones are analyzed. The workload is very large. If the results are not calculated in time and the corresponding statistical diagram is made, the best improvement time will be missed. In the implementation of SPC activities, if you can use professional SPC software, these problems will be solved.
The implementation of the PDCA cycle to achieve continuous improvement Dr. Deming proposed the concept of the PDCA cycle earliest. (Plan), DO (execution), check (inspection), ACTION, especially have been widely used in quality management. The implementation of the SPC also uses the PDCA cycle, with the help of the SPC tool, continuously analyzes various influencing factors in quality problems, analyzes the main reasons for affecting quality problems. For the main reasons, take solutions. , To achieve the purpose of continuous improvement.
SPC, as an important tool for quality improvement, is not only suitable for industrial processes, but also for all process areas such as services. No matter in any field, you must do the preliminary training of the SPC, pay attention to the quality of the data of the implementation process, and use professional SPC software to improve the quality of the company if necessary, so that the quality level of the enterprise will continue to improve. Win more customers.
1. The two stages of the implementation of SPC
The implementation of SPC is divided into two stages, one is the analysis phase (batch trial production stage), and the other is the monitoring phase. The control diagrams used at these two stages are called analysis control graphs and control diagrams.
The main purpose of the analysis phase is:
), the process is statistically steady,
), the process ability is sufficient.
The work in the analysis stage is to prepare for production, that is, prepare the raw materials, labor, equipment, and measurement system required for the production process in accordance with the standard requirements. It can be carried out after the production preparation is completed. Note that it is necessary to ensure that the production is performed without abnormal factors that affect the various elements of production. The process ability analysis is performed to test whether the production process is in statistical stability and whether the process ability is sufficient. If no one can be satisfied, you must find the reason for improvement, and re -prepare production and analysis. Until the two purposes of the analysis phase, the analysis phase can be announced and enter the SPC monitoring stage.
The main work in the monitoring phase is to monitor the control diagram with control. At this time, the control boundary of the control diagram has been determined according to the results of the analysis phase. The data of the production process is drawn to the control in time, and the control diagram is closely observed. Out of control must find the cause and eliminate its influence as soon as possible. Monitoring can fully reflect the role of SPC prevention and control.
In the actual application of the factory, for each control project, it must pass the above two stages, and it will repeat the process from analysis to monitoring when necessary.
2. SPC control diagram (control diagram) adjustment of the regulatory limit of control
) SPC control diagram characteristics: traceability, predictability, continuity (stability); so The control boundary of the SPC control graph can be delayed. rn更多SPC专业问题在太友SPC在线rnrn 2） 4M1E分析方法，4M1E：人（MAN）、机（MACHINE）、料（MATETIAL）、法（METHOD）、 Ring (); Five factors must be re -calculated as long as one change.
First of all, what is the role of SPC and SPC? Attach importance to the internal and external customers of the enterprise, and take customer satisfaction as the main goal. These goals must be continuously improved in value. The use of SPCs can make us work more effectively. At the same time, everyone in our organization must ensure that constantly constantly Improve and use effective methods. Understanding and mastering the SPC theory is the prerequisite for implementing SPCs. Due to different production processes, companies in different industries will also have some differences in the implementation of the SPC implementation methods and steps. The collection data mainly uses reasonable sampling methods to ensure the integrity and accuracy of the data required by the SPC. Including the time interval of sampling, the sample sample, the arrangement of random sampling, the distribution of sampling, etc., quality management personnel can use the results of the statistical analysis of SPC software and combine the actual situation of the enterprise, and continue to improve the quality. The differences between CPK, CMK, calculations ppk, CPK, and the difference between CMK and calculations 1. First of all, let's explain the definition of PP and CP and formulas cp (Indies of Process): The ability index of the stable process is defined as the capacity of the tolerance and the process of the process. The general expression is: PP (Indies of Process): The process performance index is defined as not considering not considering When the process is off or not, the range of the tolerance is divided by the process performance. The general expression is: (the index is only used to compare with CP and CPK, or/with CP and CPK Improved priority) cpu: The upper limit capacity index of the stable process is defined as the upper limit of the distribution width of the actual process. The general expression is: cpl: the lower limit capacity index of the stability process is defined as as defined as The lower limit of the tolerance range is divided into the lower limit of the distribution width of the actual process. The general expression is: 2, now let's explain the meaning of CPK and PPK cpk: This is the ability to consider the ability of the process center (correction) index, define the definition The minimum value of CPU and CPL. It is equal to the difference between the average process between the process and the nearest regulatory boundary. That is: PPK: This is the minimum value of: or the minimum value of the performance center of the process center. That is: In fact, K in the formula is the deviation of defining distribution center μ and tolerance center M, and the deviation of μ and m is ε = | m-μ |, then: So, 3, the different meanings of the standard deviation in the formula ① In CP and CPK, the ability to stabilize the process is calculated. During the stability process, the difference in the process is only caused by ordinary reasons. The average difference in the samples is estimated to be concluded: Therefore, CP and CPK are generally used together with the control chart. First, the control diagram is used to determine whether the process is controlled. Controlled state. Make sure that the process is controlled, then calculate CP and CPK. ② Due to the variation caused by two common and special reasons, it can be estimated by the sample standard deviation s, and the calculation of the process performance index is used.
First of all, it must be the attention and support of the company's senior leaders. It is the most labor -saving way to promote one thing from top to top; The understanding of SPC is directly related to the success of the project; again, it is best to use a professional SPC analysis software to assist analysis. The dependence of artificial operations to people is too high, and it is easy to make mistakes. The resistance is heavy. The set of good plans to be implemented, it is inseparable from the thorough plan, institutional constraints, supervision and inspection, and share some of the contents that need to be prepared inside the SPC (see Figure).
To do a good SPC, you need to learn some basic knowledge of statistical, such as probability theory and mathematical statistics; and then when applying for specific application, first select the key quality characteristics, and then choose according to whether it is counting or measuring values. A suitable control diagram, then determine the control boundary, draw points, find abnormalities, and then investigate the causes of abnormalities, and exclude abnormalities (usually exclude abnormal data at the same time, and re -calculate the control boundary). The key to doing a good SPC is how to find the root cause of abnormalities when abnormalities. This is difficult. Many times, the reason is not found at all, and you need to study well.
To ensure the successful implementation of the SPC, enterprises should pay attention to the following aspects:
In more SPC professional problems in Guangzhou Taiyou SPC Online
The understanding and importance of management n Poor quality is caused by poor quality or irresponsibility of relevant staff. In fact, if advanced quality management technology and tools are adopted, the quality can be improved significantly under the circumstances that the original conditions are unchanged. SPC is such a effective tool. At the same time, the support of management must be obtained at all stages of the SPC. If training is required in the initial stage of the SPC, this requires funds and time, and management coordination arrangements are required. In the implementation process, some processes need to be adjusted, and some even change processes, replacement equipment, etc. These require the support and recognition of management. Therefore, the implementation of SPCs is very important for management and attention.
In more SPC professional issues in Guangzhou Taiyou SPC Online
In enhanced training
The pre -SPC training for relevant personnel is an important prerequisite for implementing SPC, because SPC is based on mathematical statistics The management method based on the theory of probability theory must have a certain theoretical basis in the production process. The training can be selected and sent to the external training units to participate in the training. If possible, the training institution should be invited to the factory to train. On the one hand, the number of people can increase the number of trainers. On the other hand, the training content can be more in line with the factory’s Actually, improve the training effect.
The importance of data
The implementation of SPC itself is a quantitative management. The quality of the data is very important. Action. There are two main aspects that affect the quality of data. On the one hand, the impact of the system is measured, and on the other hand, it is a man -made influence of data and calculation. For the impact of the measurement system, we must regularly analyze the system to confirm whether our measurement system is available, so as to ensure our data quality and minimize human mistakes at the same time.
The professional SPC software
In the implementation of the SPC process, because it is necessary to use a large amount of data, at the same time calculate these data, and analyze it with a variety of statistical methods. The middle ones are analyzed. The workload is very large. If the results are not calculated in time and the corresponding statistical diagram is made, the best improvement time will be missed. In the implementation of SPC activities, if you can use professional SPC software, these problems will be solved.
The implementation of the PDCA cycle to achieve continuous improvement
Dr. Deming proposed the concept of the PDCA cycle earliest. (Plan), DO (execution), check (inspection), ACTION, especially have been widely used in quality management. The implementation of the SPC also uses the PDCA cycle, with the help of the SPC tool, continuously analyzes various influencing factors in quality problems, analyzes the main reasons for affecting quality problems. For the main reasons, take solutions. , To achieve the purpose of continuous improvement.
SPC, as an important tool for quality improvement, is not only suitable for industrial processes, but also for all process areas such as services. No matter in any field, you must do the preliminary training of the SPC, pay attention to the quality of the data of the implementation process, and use professional SPC software to improve the quality of the company if necessary, so that the quality level of the enterprise will continue to improve. Win more customers.
1. The two stages of the implementation of SPC
The implementation of SPC is divided into two stages, one is the analysis phase (batch trial production stage), and the other is the monitoring phase. The control diagrams used at these two stages are called analysis control graphs and control diagrams.
The main purpose of the analysis phase is:
), the process is statistically steady,
), the process ability is sufficient.
The work in the analysis stage is to prepare for production, that is, prepare the raw materials, labor, equipment, and measurement system required for the production process in accordance with the standard requirements. It can be carried out after the production preparation is completed. Note that it is necessary to ensure that the production is performed without abnormal factors that affect the various elements of production. The process ability analysis is performed to test whether the production process is in statistical stability and whether the process ability is sufficient. If no one can be satisfied, you must find the reason for improvement, and re -prepare production and analysis. Until the two purposes of the analysis phase, the analysis phase can be announced and enter the SPC monitoring stage.
The main work in the monitoring phase is to monitor the control diagram with control. At this time, the control boundary of the control diagram has been determined according to the results of the analysis phase. The data of the production process is drawn to the control in time, and the control diagram is closely observed. Out of control must find the cause and eliminate its influence as soon as possible. Monitoring can fully reflect the role of SPC prevention and control.
In the actual application of the factory, for each control project, it must pass the above two stages, and it will repeat the process from analysis to monitoring when necessary.
2. SPC control diagram (control diagram) adjustment of the regulatory limit of control
) SPC control diagram characteristics: traceability, predictability, continuity (stability); so The control boundary of the SPC control graph can be delayed. rn更多SPC专业问题在太友SPC在线rnrn 2） 4M1E分析方法，4M1E：人（MAN）、机（MACHINE）、料（MATETIAL）、法（METHOD）、 Ring (); Five factors must be re -calculated as long as one change.
First of all, what is the role of SPC and SPC? Attach importance to the internal and external customers of the enterprise, and take customer satisfaction as the main goal. These goals must be continuously improved in value. The use of SPCs can make us work more effectively. At the same time, everyone in our organization must ensure that constantly constantly Improve and use effective methods. Understanding and mastering the SPC theory is the prerequisite for implementing SPCs. Due to different production processes, companies in different industries will also have some differences in the implementation of the SPC implementation methods and steps.
The collection data mainly uses reasonable sampling methods to ensure the integrity and accuracy of the data required by the SPC. Including the time interval of sampling, the sample sample, the arrangement of random sampling, the distribution of sampling, etc., quality management personnel can use the results of the statistical analysis of SPC software and combine the actual situation of the enterprise, and continue to improve the quality. The differences between CPK, CMK, calculations
ppk, CPK, and the difference between CMK and calculations
1. First of all, let's explain the definition of PP and CP and formulas
cp (Indies of Process): The ability index of the stable process is defined as the capacity of the tolerance and the process of the process. The general expression is:
PP (Indies of Process): The process performance index is defined as not considering not considering When the process is off or not, the range of the tolerance is divided by the process performance. The general expression is:
(the index is only used to compare with CP and CPK, or/with CP and CPK Improved priority)
cpu: The upper limit capacity index of the stable process is defined as the upper limit of the distribution width of the actual process. The general expression is:
cpl: the lower limit capacity index of the stability process is defined as as defined as The lower limit of the tolerance range is divided into the lower limit of the distribution width of the actual process. The general expression is:
2, now let's explain the meaning of CPK and PPK
cpk: This is the ability to consider the ability of the process center (correction) index, define the definition The minimum value of CPU and CPL. It is equal to the difference between the average process between the process and the nearest regulatory boundary. That is:
PPK: This is the minimum value of: or the minimum value of the performance center of the process center. That is:
In fact, K in the formula is the deviation of defining distribution center μ and tolerance center M, and the deviation of μ and m is ε = | m-μ |, then:
So,
3, the different meanings of the standard deviation in the formula
① In CP and CPK, the ability to stabilize the process is calculated. During the stability process, the difference in the process is only caused by ordinary reasons. The average difference in the samples is estimated to be concluded:
Therefore, CP and CPK are generally used together with the control chart. First, the control diagram is used to determine whether the process is controlled. Controlled state. Make sure that the process is controlled, then calculate CP and CPK.
② Due to the variation caused by two common and special reasons, it can be estimated by the sample standard deviation s, and the calculation of the process performance index is used.
First of all, it must be the attention and support of the company's senior leaders. It is the most labor -saving way to promote one thing from top to top; The understanding of SPC is directly related to the success of the project;
again, it is best to use a professional SPC analysis software to assist analysis. The dependence of artificial operations to people is too high, and it is easy to make mistakes. The resistance is heavy.
The set of good plans to be implemented, it is inseparable from the thorough plan, institutional constraints, supervision and inspection, and share some of the contents that need to be prepared inside the SPC (see Figure).
To do a good SPC, you need to learn some basic knowledge of statistical, such as probability theory and mathematical statistics;
and then when applying for specific application, first select the key quality characteristics, and then choose according to whether it is counting or measuring values. A suitable control diagram, then determine the control boundary, draw points, find abnormalities, and then investigate the causes of abnormalities, and exclude abnormalities (usually exclude abnormal data at the same time, and re -calculate the control boundary).
The key to doing a good SPC is how to find the root cause of abnormalities when abnormalities. This is difficult. Many times, the reason is not found at all, and you need to study well.
Data basic collection and sampling distribution rationality