System and method for controlling product quality

Abstract

The present application provides a system and method for controlling the quality of a product, the system comprising: a display, which displays a screen; and a controller, which generates a process performance index diagram and a single value control diagram of the quality factor based on data related to the quality factor of the product, the controller also controls so that the process performance index diagram and the single value control diagram for the same quality factor are displayed on the same display screen of the display, wherein the quality factor comprises: production parameters during the manufacturing process of the product; and / or characteristic parameters during the manufacturing process of the product, and / or after manufacturing, and the data related to the quality factor of the product comprises: monitoring data of the production parameters during the manufacturing process of the product; and / or detection data of the characteristic parameters during the manufacturing process of the product, and / or after manufacturing.

Description

Technical Field

[0001] The present application relates to the technical field of data processing, and in particular to a system and method for controlling product quality based on data processing. Background Art

[0002] In the production of products, it is necessary to control the quality of the products.

[0003] In the prior art, a statistical process control (SPC) system can be used to monitor the quality of the final product. The monitoring results can be fed back to the production process to adjust the relevant factors of the product production process and thus improve product quality.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0005] The inventors of the present application have discovered that the existing method of using the SPC system for product quality control is to monitor the production results but not the production process. Therefore, it is difficult to improve product quality by monitoring the production process and adjusting production factors in a timely manner.

[0006] In order to solve the above problems or other similar problems, the embodiments of the present application provide a system and method for controlling the quality of a product. In the system, a process performance index (PPK) diagram and a single value control diagram are generated based on data related to the quality factors of the product, and the PPK diagram and the single value control diagram are displayed on the same display screen, so that the quality factors of the product can be monitored in a visual manner, thereby facilitating timely adjustment of the production factors involved in the product production process, thereby achieving product quality control in the production process and reducing the batch defect rate of the product.

[0007] According to one aspect of an embodiment of the present application, a system for controlling product quality is provided, including:

[0008] A display for displaying images; and

[0009] A controller generates a Process Performance Index (PPK) chart and a single value control chart of the quality factor based on data related to the quality factor of the product,

[0010] The controller further controls so that the process performance index (PPK) chart and the single value control chart for the same quality factor are displayed on the same display screen of the display.

[0011] The quality factors include:

[0012] Production parameters during the manufacture of the product; and / or

[0013] The characteristic parameters of the product during and / or after manufacturing,

[0014] The data related to the quality factors of the product include:

[0015] Monitoring data of the production parameters during the manufacturing process of the product; and / or

[0016] The detection data of the characteristic parameters during the manufacturing process of the product and / or after the manufacturing is completed.

[0017] According to another aspect of an embodiment of the present application, a method for controlling product quality is provided, comprising: generating a process performance index (PPK) diagram and a single value control diagram of the quality element according to data related to the quality element of the product; and displaying the process performance index (PPK) diagram and the single value control diagram for the same quality element on the same display screen of a display, wherein the quality element comprises:

[0018] Production parameters during the manufacture of the product; and / or

[0019] The characteristic parameters of the product during and / or after manufacturing,

[0020] The data related to the quality factors of the product include:

[0021] Monitoring data of the production parameters during the manufacturing process of the product; and / or

[0022] The detection data of the characteristic parameters during the manufacturing process of the product and / or after the manufacturing is completed.

[0023] One of the beneficial effects of the embodiments of the present application is that a PPK diagram and a single value control diagram are generated based on data related to the quality factors of the product, and the PPK diagram and the single value control diagram are displayed on the same display screen, so that the quality factors of the product can be monitored in a visual manner, thereby facilitating timely adjustment of the production factors involved in the product production process, thereby achieving product quality control in the production process and reducing the batch defect rate of the product.

[0024] With reference to the following description and accompanying drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present invention include many changes, modifications and equivalents.

[0025] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0026] It should be emphasized that the term “comprising” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the implementation of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0028] Figure 1 is a schematic diagram of a system for controlling product quality in Example 1 of the present application;

[0029] Figure 2 is a schematic diagram of a display screen of the display 10;

[0030] Figure 3 is another schematic diagram of a display screen of the display 10;

[0031] Figure 4 It is a schematic diagram of the method for controlling product quality in Example 2 of the present application. DETAILED DESCRIPTION

[0032] The foregoing and other features of the present application will become apparent through the following description with reference to the accompanying drawings. In the description and the accompanying drawings, specific embodiments of the present application are specifically disclosed, which show some embodiments in which the principles of the present application can be adopted. It should be understood that the present application is not limited to the described embodiments. On the contrary, the present application includes all modifications, variations and equivalents falling within the scope of the attached notes. Various embodiments of the present application are described below in conjunction with the accompanying drawings. These embodiments are exemplary only and are not limitations of the present application.

[0033] In the embodiments of the present application, the terms "first", "second", etc. are used to distinguish different elements from the title, but do not indicate the spatial arrangement or time order of these elements, etc., and these elements should not be limited by these terms. The term "and / or" includes any one and all combinations of one or more of the associated listed terms. The terms "including", "having", etc. refer to the existence of the stated features, elements, components or components, but do not exclude the existence or addition of one or more other features, elements, components or components.

[0034] In the embodiments of the present application, the singular forms "a", "the", etc. include plural forms and should be broadly understood as "a kind" or "a type" rather than being limited to the meaning of "one"; in addition, the term "the" should be understood to include both singular and plural forms, unless the context clearly indicates otherwise. In addition, the term "according to" should be understood to mean "at least in part according to...", unless the context clearly indicates otherwise.

[0035] Example 1

[0036] Embodiment 1 of the present application provides a system for controlling the quality of a product.

[0037] Figure 1 Schematic diagram of a system for controlling product quality in Example 1 of the present application. Figure 1 As shown, the system 1 for controlling the quality of a product includes: a display 10 and a controller 20 .

[0038] The display 10 is capable of displaying images.

[0039] The controller 20 generates a process performance index (PPK) diagram and a single value control diagram of the quality factor based on data related to the quality factor of the product; and the controller 20 can also control so that the process performance index (PPK) diagram and the single value control diagram for the same quality factor are displayed on the same display screen of the display 10.

[0040] In Example 1 of the present application, a PPK diagram and a single value control diagram are generated based on data related to the quality factors of the product, and the PPK diagram and the single value control diagram are displayed on the same display screen, so that the quality factors of the product can be monitored in a visual manner, thereby facilitating timely adjustment of the production factors involved in the product production process, thereby achieving product quality control in the production process and reducing the batch defect rate of the product.

[0041] In this embodiment, the quality factor of a product refers to a factor that has a greater impact on the quality of the product. The quality factor of a product can be obtained by analyzing the key quality characteristics of the product. For example, the relationship between the key characteristics of the product and the factors that affect the quality of the product can be determined in combination with the process principles in the product manufacturing process, and the influence of each factor can be evaluated through experiments, so as to determine the factor that has a greater impact on the quality of the product as the quality factor of the product.

[0042] The quality factors of a product may include: production parameters during the manufacturing process of the product, wherein the production parameters include, for example: operating status parameters of the production equipment, and / or process parameters, and / or parameters such as material properties and usage. The quality factors of a product may also include: characteristic parameters obtained by testing during the manufacturing process of the product and / or after manufacturing. For example, if the product is a circuit board, the characteristic parameters of the product may be the thickness of the metal wiring measured during the manufacturing process of the circuit board, and / or the strength of the circuit board after manufacturing. In the present application, the quality factors of a product may be at least one of the above-mentioned production parameters and the above-mentioned characteristic parameters.

[0043] In the present application, data related to the quality factors of a product may include: monitoring data obtained by monitoring the production parameters during the manufacturing process of the product. Data related to the quality factors of a product may also include: detection data obtained by detecting the above characteristic parameters during the manufacturing process of the product and / or after the product is manufactured. In the present application, data related to the quality factors of a product may include at least one of the above monitoring data and the above detection data.

[0044] In the present application, there may be multiple quality factors of a product, and the controller 20 may control to generate a PPK diagram and a single value control diagram of each quality factor for data related to the quality factor, and display the PPK diagram and the single value control diagram corresponding to the same quality factor on the same display screen of the display 10. In the present application, there may be multiple displays 10. Among them, the display screen of one display 10 may display the PPK diagram and the single value control diagram corresponding to one quality factor, or the display screen of one display 10 may alternately display the PPK diagrams and the single value control diagrams corresponding to different quality factors.

[0045] In the present application, the specific process of the controller 20 generating the PPK diagram and the single value control diagram can refer to the relevant technology.

[0046] Figure 2 is a schematic diagram of a display screen of the display 10, such as Figure 2 As shown, the display screen 100 can display: a PPK diagram A and a single value control diagram B corresponding to the quality factors.

[0047] like Figure 2 As shown, there are multiple data points 111 in the PPK graph A. The vertical axis of the PPK graph A represents the process performance index of the data point, for example, the value of the complex process capability index (CPK). The horizontal axis of the PPK graph A represents the number of each data point, and the number of each data point can correspond to time. In the PPK graph A, a data point 111 can represent a batch of products, the number of the data point represented by the horizontal axis can be the number of the product batch, and the coordinate of the horizontal axis can be expressed as MO(n), where n can be a natural number.

[0048] The controller 20 can be controlled so as to display the information of the first threshold value in the PPK diagram A. The first threshold value is used to indicate the lower limit value of the preset process performance index. The first threshold value can be used to warn the process performance index of the data point. The information of the first threshold value can be displayed as a line 112 perpendicular to the vertical axis, for example.

[0049] like Figure 2 As shown, the single value control chart B can be a measurement type single value control chart. The single value control chart B can have multiple data points 121. The vertical axis of the single value control chart B represents the measurement value corresponding to the data point (for example, the measurement value can be the value of the data related to the quality factor of the product, such as the characteristic value), and the horizontal axis represents the cumulative amount of the data, and the cumulative amount of the data gradually increases with the passage of time.

[0050] The controller 20 can also perform control so that a control center line 122 is displayed in the single value control diagram B. The control center line 122 can be a line perpendicular to the longitudinal axis. In addition, the controller 20 can also perform control so that an upper limit control line 123 and / or a lower limit control line 124 are displayed in the single value control diagram B. The upper limit control line 123 is above the control center line 122, and the lower limit control line 124 is below the control center line 122.

[0051] In the single value control chart B, data point 121 is a discrete point. Data point 121 fluctuates around the control center line 122, indicating that the production process is stable and the data meets the requirements; data point 121 is higher than the upper control line 123 or lower than the lower control line 124, indicating that the production process fluctuates greatly and the data does not meet the requirements, for example, the product quality does not meet the requirements; data point 121 is between the upper control line 123 and the lower control line 124, but is far from the control center line 122, that is, the fluctuation center of data point 121 deviates from the control center line 122, indicating that although the data meets the requirements, the production process fluctuates greatly. Single value control chart B can show that the fluctuation center of the data point is offset upward or downward relative to the control center line 122.

[0052] In the present application, for the same batch of products, a data point 111 in the PPK diagram A may correspond to a data point set 121A in the single value control diagram B, where the data point set 121A includes multiple data points 121, and the multiple data points 121 are used to represent the data obtained by monitoring or detecting the quality factors of the batch of products.

[0053] In the present application, the controller 20 can control so that the display screen 100A (such as Figure 3 For example, the controller 20 may receive an instruction to switch the display screen from an operator (e.g., a manufacturer of the product), and switch the display screen 100 to the display screen 100A, thereby displaying the data point 111 selected by the operator and the corresponding data point set 121A.

[0054] Figure 3 1 is a schematic diagram of a display screen 100A of the display 10. Figure 3 As shown, the controller 20 can control so that a certain data point 111 (for example, the data point with the horizontal coordinate MO(1)) and its corresponding data point set 121A are displayed in the display screen 100A. Figure 3 As shown, the display screen 100A can display PPK Figure 3 A,PPK Figure 3 A contains data point 111 of the product with batch number MO(1); the display screen 100A can also display single value control Figure 3 B; Single value control Figure 3 The data point 121 in B is generated based on the data of monitoring or testing the product of the batch numbered MO(1); single value control Figure 3 The vertical axis of B can represent the measurement value (i.e., characteristic value) obtained by monitoring or testing the product, such as the coil quality factor (Q value), single value control Figure 3 There is a predetermined corresponding relationship between the measurement value represented by the ordinate of B and the measurement value represented by the ordinate of the single-value control diagram B of the display screen 100, and the units of the two may be different or the same.

[0055] In the present application, different devices can be used to monitor or detect the same quality factor of the same batch of products to obtain data. By comparing the data obtained by different devices, the data deviation caused by the difference in equipment (i.e., machine error) can be identified, thereby improving the authenticity and validity of the data. For example, when the controller 20 detects that the difference in the mean of the data obtained by different devices exceeds a predetermined value (e.g., 5%), it will generate a first warning message, thereby indicating that the difference between different devices is large, thereby reminding the producer to check the equipment to avoid obtaining false data.

[0056] like Figure 3 As shown, in the display screen 100A, for single value control Figure 3 B, the data point 121 located in the area 3B1 may correspond to the first device, the data point 121 located in the area 3B2 may correspond to the second device, the mean value of the ordinate of the data point 121 in the area 3B1 is P1, and the mean value of the ordinate of the data point 121 in the area 3B2 is P2. If the absolute value of the difference between P1 and P2 exceeds 5%, the controller 20 generates a first warning message. The first warning message may be displayed in the display screen 100A, or in the screen 100, or in both the screen 100A and the screen 100. The first warning message may be, for example, text or picture information in the display screen.

[0057] In addition, the display screen 100A can also display production or inspection related information 31, such as machine type (machine type), classification, machine model (machine type), product line (production line), time period for obtaining data (time interval), characteristic value, etc. The display screen 100A can also display a search button 32, so that the producer can fill in the information 31 related to production or inspection and then click the search button 32 to generate a PPK corresponding to the filled-in information in the display screen 100A. Figure 3 A and single value control Figure 3 B.

[0058] like Figure 2 As shown, the abscissa of the data point 121 of the single value control chart B has a corresponding relationship with the abscissa of the data point 111 of the PPK chart A. For example, corresponding to the same batch of products, the abscissa of the data point 121 of the single value control chart B can be offset to the right by a certain value relative to the abscissa of the data point 111 of the PPK chart A.

[0059] like Figure 2 The ordinate of the data point 121 of the single value control chart B and the ordinate of the data point 111 of the PPK chart A also have a corresponding relationship. For example, when the ordinate of the data point 111 of the PPK chart A becomes smaller, the fluctuation center of the corresponding data point 121 of the single value control chart B shifts upward or downward relative to the control center line.

[0060] In the present application, the controller 20 may generate a second warning message when it is detected that the process performance index PPK of a predetermined number of data points 111 in the process performance index graph is lower than a first threshold. For example, the second warning message includes: the controller 20 generates a second warning message when it is detected that three consecutive data points are located below the line 112. The second warning message is, for example, to make the PPK graph A flash, or to make the data points of the PPK graph flash, or to display a text second warning message on the screen 100.

[0061] For example, in Figure 2 In the figure, the multiple continuous data points 111 shown by the dotted line 11A are located below the line 112, and the controller 20 can generate a second warning information; and, since there is a corresponding relationship between the data point 111 of the PPK diagram A and the data point 121 of the single-value control diagram B, the data point 121 shown by the dotted line 12B corresponding to the multiple continuous data points 111 shown by the dotted line 11A fluctuates upward relative to the control center line 122.

[0062] In this application, if Figure 2 As shown, the controller 20 can also control so that the information of production factors affecting the quality factors is also displayed on the screen 100 of the display 20. The production factors can be, for example, the personnel involved in the production process of the product (Man), the materials used in the product (Material), the equipment used for product production (Machine), the operation method (Method) and other factors. The icons 13 of the above production factors can be displayed on the screen 100.

[0063] In the emergence Figure 2 When the second warning information corresponding to the middle dotted line 11A appears, the producer can adjust at least one of the above production factors to cope with the appearance of the second warning information. The information of the adjusted production factor can be displayed on the screen 100. For example, when adjusting the material, the icon corresponding to the material can be displayed by flashing or highlighting. In addition, the adjustment content information of the adjusted production factor can also be displayed on the screen 100. For example, when adjusting the material, the type of the adjusted material can also be displayed on the screen 100.

[0064] In this application, displaying the information of the production factors and the adjusted production factors on the screen can help the producer to respond to the second warning information in a timely and effective manner. Figure 2 When the second warning information corresponding to the middle dotted line 11A is received, the producer first adjusts the personnel in the production factor (such as Figure 2131), it is found that the second warning information still exists, and the data point 111 in PPK graph A is still below line 112; then, the producer adjusts the material (as shown in FIG. Figure 2 As a result, the data point 111 in the PPK graph A is restored to the maximum value (as shown in FIG. Figure 2 The dotted line 21A shows that the adjustment material can effectively cope with the data fluctuation. At this time, although the data point 121 in the single value control chart B is stable, it is offset downward relative to the control center line 122 (as shown in FIG. Figure 2 Next, the producer continues to adjust the material (as shown by the dashed line 22B). Figure 2 133), the data point 111 in PPK graph A continues to remain at the maximum value (as shown in FIG. Figure 2 The data point 121 in the single value control chart B is not only stable, but also located near the control center line 122 (as shown by the dotted line 31A). Figure 2 As shown in the dotted line 32B), the adjustment of the material can be stopped, the current material can be kept, and product production can continue.

[0065] like Figure 2 As shown, in the present application, the PPK diagram A and the single value control diagram B are displayed in the same screen 100 of the display 10, which can facilitate timely and effective control of the production process of the product. For example, through the PPK diagram A, the second warning information can be generated in the display screen in a timely manner to prompt the producer to change the production factors in a timely manner; through the single value control diagram B, it can indicate whether the data fluctuates upward or downward relative to the control center line, thereby prompting the change direction of the production factors, so as to achieve effective changes in the production factors as soon as possible. In addition, the information of the production factors that affect the quality factors is further displayed in the same screen 100 of the display 10, thereby helping the producer to quickly identify the impact of each production factor on the data fluctuation, thereby effectively adjusting the production factors to restore the stability of the data. In addition, displaying the first warning information on the display screen can remind the producer that there is a machine error in the equipment to avoid obtaining untrue data.

[0066] Example 2

[0067] Embodiment 2 of the present application provides a method for controlling the quality of a product. The method corresponds to the system for controlling the quality of a product in Embodiment 1.

[0068] Figure 4 is a schematic diagram of a method for controlling product quality in Example 2, such as Figure 4 As shown, the method includes:

[0069] Operation 401: Generate a process performance index (PPK) chart and a single value control chart of a quality factor according to data related to the quality factor of a product; and

[0070] Operation 402: Display the process performance index (PPK) chart and the individual value control chart for the same quality factor on the same display screen of a display.

[0071] In this embodiment, the quality factors include:

[0072] Production parameters during the manufacturing process of the product; and / or characteristic parameters of the product during and / or after the manufacturing process.

[0073] The data related to the quality factors of the product include: monitoring data of the production parameters during the manufacturing process of the product; and / or detection data of the characteristic parameters during the manufacturing process and / or after the manufacturing of the product.

[0074] like Figure 4 As shown, the method also includes:

[0075] Operation 403: When it is detected that the difference between the data related to the same quality element acquired by different devices exceeds a predetermined value, generate first warning information.

[0076] like Figure 4 As shown, the method also includes:

[0077] Operation 404 : When it is detected that the process performance index of a predetermined number of data points in the process performance index graph is lower than a first threshold, generate second warning information.

[0078] In this embodiment, the process performance index graph displays information about the first threshold.

[0079] In this embodiment, information on production factors that affect the quality factor is also displayed on the screen of the display.

[0080] In this embodiment, the information of the adjusted production factor is also displayed on the screen of the display.

[0081] In this embodiment, a control center line is displayed in the single value control diagram.

[0082] In this embodiment, an upper limit control line and / or a lower limit control line are also displayed in the single value control diagram.

[0083] In Example 2 of the present application, a PPK diagram and a single value control diagram are generated based on data related to the quality factors of the product, and the PPK diagram and the single value control diagram are displayed on the same display screen, so that the quality factors of the product can be monitored in a visual manner, thereby facilitating timely adjustment of the production factors involved in the product production process, thereby achieving product quality control in the production process and reducing the batch defect rate of the product. In addition, the information of the production factors that affect the quality factors is further displayed on the same screen of the display, thereby helping the producer to quickly identify the impact of each production factor on data fluctuations, thereby effectively adjusting the production factors to restore data stability.

[0084] The controller described in conjunction with the embodiments of the present invention may be directly embodied as hardware, a software module executed by a processor, or a combination of the two. For example, one or more of the functional block diagrams shown in the accompanying drawings and / or one or more combinations of the functional block diagrams may correspond to various software modules of the computer program flow or to various hardware modules. These software modules may correspond to the steps shown in Example 3, respectively. These hardware modules may be implemented by solidifying these software modules, for example, using a field programmable gate array (FPGA).

[0085] The software module may be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium may be coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium may be an integral part of the processor. The processor and the storage medium may be located in an ASIC. The software module may be stored in a memory of a mobile terminal or in a memory card that can be inserted into the mobile terminal. For example, if the electronic device uses a large-capacity MEGA-SIM card or a large-capacity flash memory device, the software module may be stored in the MEGA-SIM card or the large-capacity flash memory device.

[0086] One or more of the functional block diagrams described in the accompanying drawings and / or one or more combinations of the functional block diagrams may be implemented as a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or any appropriate combination thereof for performing the functions described in the present application. One or more of the functional block diagrams described in the accompanying drawings and / or one or more combinations of the functional block diagrams may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in communication with a DSP, or any other such configuration.

[0087] The present application is described above in conjunction with specific implementation methods, but it should be clear to those skilled in the art that these descriptions are exemplary and are not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on the principles of the present application, and these modifications and variations are also within the scope of the present application.

Claims

1. A system for controlling product quality, characterized in that: The system comprises: A display for displaying images; and A controller, which generates a process performance index diagram and a single value control diagram of the quality factor based on data related to the quality factor of the product, The controller further controls so that the process performance index diagram and the single value control diagram for the same quality factor are displayed on the same display screen of the display. in, The quality factors include: Production parameters during the manufacture of the product; and / or, The characteristic parameters of the product during the manufacturing process and / or after the manufacturing is completed, The data related to the quality factors of the product include: Monitoring data of the production parameters during the manufacturing process of the product; and / or, The test data of the characteristic parameters during and / or after the manufacturing process of the product, The controller further controls so that information of a plurality of production factors affecting the quality factor is displayed in a first area of ​​the display screen of the display, Wherein, when at least one of the plurality of production factors is adjusted, the controller further controls so that an icon of the adjusted at least one production factor is displayed in a second area outside the first area of ​​the display screen of the display.

2. The system of claim 1, wherein: The controller generates first warning information when detecting that the difference between the data related to the same quality element obtained by different devices exceeds a predetermined value.

3. The system of claim 1, wherein: The controller generates second warning information when detecting that the process performance index of a predetermined number of data points in the process performance index map is lower than a first threshold.

4. The system of claim 3, wherein: The controller performs control so that information of the first threshold value is displayed in the process performance index graph.

5. The system of claim 1, wherein: Icons of production elements that have not been adjusted are not displayed in the second area.

6. The system of claim 1, wherein: The controller performs control so that a control center line is displayed in the single value control diagram.

7. The system of claim 6, wherein: The controller performs control so that an upper limit control line and / or a lower limit control line are also displayed in the single value control diagram.

8. A method for controlling product quality, characterized in that: The method comprises: Generating a process performance index chart and a single value control chart of the quality factor based on data related to the quality factor of the product; and The process performance index chart and the single value control chart for the same quality factor are displayed on the same display screen of a display, in, The quality factors include: Production parameters during the manufacture of the product; and / or The characteristic parameters of the product during the manufacturing process and / or after the manufacturing is completed, The data related to the quality factors of the product include: Monitoring data of the production parameters during the manufacturing process of the product; and / or The test data of the characteristic parameters during and / or after the manufacturing process of the product, The method further comprises: Displaying information of a plurality of production factors affecting the quality factor in a first area of ​​a display screen of the display; and When at least one of the plurality of production elements is adjusted, an icon of the adjusted at least one production element is displayed in a second area outside the first area of ​​the display screen of the display.

9. The method of claim 8, wherein: The method further comprises: When it is detected that the difference between the data related to the same quality element acquired by different devices exceeds a predetermined value, a first warning information is generated.

10. The method of claim 8, wherein: The method further comprises: When it is detected that the process performance index of a predetermined number of data points in the process performance index map is lower than a first threshold, second warning information is generated.

11. The method of claim 10, wherein: The process performance index graph displays information about the first threshold.

12. The method of claim 8, wherein: Icons of production elements that have not been adjusted are not displayed in the second area.

13. The method of claim 8, wherein: A control center line is displayed in the individual value control chart.

14. The method of claim 13, wherein: The individual value control chart also displays an upper limit control line and / or a lower limit control line.

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