A method for evaluating process quality of flexible production line

Abstract

The present application discloses a flexible production line process quality evaluation method, including: obtaining a digital model of a part to be processed and its processing quality requirements; obtaining the processing features of the part to be processed and the processing tolerance of the part to be processed according to the digital model of the part to be processed and its processing quality requirements; defining the processing allowance of the processing feature after completing a certain process as the process feature according to the processing features of the part to be processed and the processing tolerance of the part to be processed, obtaining the theoretical features of the process feature and the processing tolerance of the process feature; detecting the actual features of the process feature, and obtaining the processing error of the process feature according to the theoretical features of the process feature and the actual features of the process feature; comparing the processing error of the process feature with the processing tolerance of the process feature to obtain the processing process quality evaluation result. The processing quality of the current process can be effectively evaluated, and the evolution law of the processing process quality can be reflected after the data is accumulated to a certain extent.

Description

Technical Field

[0001] The present application relates to the field of automation, and in particular to a method for evaluating process quality of a flexible production line. Background Art

[0002] Flexible production lines have a high degree of automation and a fast production pace. The processing quality is affected by the coupling of multiple factors such as equipment, fixtures, tools and processing technology. It is impossible to directly establish an accurate correlation between the quality of the finished product and the various influencing factors of the process system. The traditional quality control model based on result inspection is difficult to reflect the evolution of product quality during the processing process. When the quality of the finished parts is found to be abnormal, batch quality problems have often occurred, and the quality cost is extremely high. For example, when the equipment is processing parts, it often requires a large number of processing procedures. Assuming that 10 processing procedures are required, when we conduct inspections based on the results (that is, after completing all 10 processing procedures), unqualified parts are found. Then, all the parts to be processed on the equipment that have started these 10 procedures are at risk of being unqualified, and the specific process of the unqualified parts is difficult to trace, resulting in the need for the entire equipment to be repaired and rectified, which requires a lot of time and resources. How to accurately describe the quality of the processing process and its evolution is crucial to achieving quality control of flexible production lines. Summary of the invention

[0003] The main purpose of this application is to provide a flexible production line process quality evaluation method, aiming to solve the technical problems of processing process quality evaluation. The specific technical solution is as follows:

[0004] A flexible production line process quality evaluation method comprises: obtaining a digital model of a part to be processed and its processing quality requirements; obtaining the processing features of the part to be processed and the processing tolerance of the part to be processed according to the obtained digital model of the part to be processed and its processing quality requirements; defining the processing allowance of the processing feature after completing a certain process as a process feature according to the processing features of the part to be processed and the processing tolerance of the part to be processed, and obtaining the theoretical features of the process feature and the processing tolerance of the process feature; detecting the actual features of the process feature, and obtaining the processing error of the process feature according to the theoretical features of the process feature and the actual features of the process feature; comparing the processing error of the process feature with the processing tolerance of the process feature to obtain a processing process quality evaluation result.

[0005] Optionally, after the step of defining the machining allowance of the machining feature after completing a certain process as the process feature according to the machining features of the parts to be machined and the machining tolerance of the parts to be machined, the step further includes: associating the process feature with the machining capability of the corresponding machining equipment to obtain the machining capability evaluation feature; setting the theoretical features of the machining capability evaluation feature and the machining tolerance of the machining capability evaluation feature; obtaining the actual features of the machining capability evaluation feature according to the actual features of the process feature and the machining capability of the corresponding machining equipment; obtaining the machining error of the machining capability evaluation feature according to the actual features of the machining capability evaluation feature and the theoretical features of the machining capability evaluation feature; comparing the machining error of the machining capability evaluation feature with the machining tolerance of the machining capability evaluation feature to obtain the machining capability evaluation result.

[0006] Optionally, the machining capability evaluation feature includes: an X-direction machining capability evaluation feature, a Y-direction machining capability evaluation feature, and a Z-direction machining capability evaluation feature of the CNC machine tool.

[0007] Optionally, the X-direction processing capability evaluation features of the CNC machine tool include: the rib position and / or rib width of the rib feature distributed along the Y direction in the process feature; the Y-direction processing capability evaluation features of the CNC machine tool include: the rib position and / or rib width of the rib feature distributed along the X direction in the process feature; the Z-direction processing capability evaluation features of the CNC machine tool include: the wall thickness of the web feature distributed along the XY plane in the process feature.

[0008] Optionally, the X-direction machining capability evaluation feature of the CNC machine tool further includes: hole positions of hole features distributed along the XY plane in the process feature.

[0009] Optionally, the Y-direction machining capability evaluation feature of the CNC machine tool also includes: hole positions of hole features distributed along the XY plane in the process feature.

[0010] Optionally, the Z-direction machining capability evaluation feature of the CNC machine tool also includes: the rib top height of the rib feature distributed along the XY plane in the process feature; and the boss plane position of the boss feature distributed along the XY plane in the process feature.

[0011] Optionally, setting the machining tolerance of the machining capability evaluation feature includes: scaling the machining tolerance of the process feature corresponding to the current process to obtain the machining tolerance of the machining capability evaluation feature.

[0012] Optionally, setting the machining tolerance of the machining capability evaluation feature further includes: scaling the machining tolerance of the process feature corresponding to the next process step to obtain the machining tolerance of the machining capability evaluation feature.

[0013] Optionally, setting the machining tolerance of the machining capability evaluation feature includes: scaling the machining tolerance of the process feature corresponding to the finishing process to obtain the machining tolerance of the machining capability evaluation feature.

[0014] The beneficial effects that can be achieved by this application are: by calculating the machining allowance of a certain machining feature after completing a certain process, the process feature is defined, so as to obtain the theoretical characteristics of the process feature, and the machining tolerance of the process feature is set according to the actual production needs. The theoretical characteristics of the process feature are set and the actual characteristics of the process feature are detected, so as to obtain the machining error of the process feature. The machining error of the process feature and the machining tolerance of the process feature are compared to obtain the machining process quality evaluation result, which can effectively evaluate the machining quality of the current process. The real-time monitoring of the machining process quality evaluation result can find the machining process that may cause the parts to be unqualified at the first time, and the equipment operation can be suspended in time, and the process can be repaired separately, while reducing the number of unqualified products. The time and resources for equipment maintenance. After the data accumulates to a certain extent, the evolution law of the quality of the machining process can be reflected, and rich and reliable evaluation data can be provided for the quality control of the flexible production line, which lays a solid foundation for improving the quality control ability. For example, it can be judged how long each process can be kept without problems after the overhaul, and the positive impact on each process after the overall maintenance of the equipment, so as to formulate the maintenance or overhaul cycle of the equipment and each process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a flow chart of obtaining a processing quality evaluation result in a flexible production line process quality evaluation method disclosed in the present application.

[0016] Figure 2 The present invention is a flow chart of obtaining a processing capability evaluation result in a flexible production line process quality evaluation method disclosed in the present application.

[0017] Figure 3 It is a flowchart of a specific application process in a flexible production line process quality evaluation method disclosed in this application. DETAILED DESCRIPTION

[0018] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0019] Reference Figure 1 The first embodiment of the present application provides a flexible production line process quality evaluation method, comprising:

[0020] Step 1, obtain the digital model of the part to be processed and its processing quality requirements. Specifically, before processing the part, the digital model of the part to be processed and its processing quality requirements are expressed in the form of visual graphics, formulas, and / or text. For example, when processing a fairing component, the digital model of the fairing component and the processing accuracy requirements are expressed.

[0021] Step 2, design a processing technology plan according to step 1, and obtain processing features and corresponding processing tolerance requirements. Specifically, the processing technology is designed according to the digital model of the part to be processed and its processing quality requirements, and the entire processing process is disassembled into a set of processing features, that is, to complete the processing of the part to be processed, it is necessary to first process it into the first processing feature, and then process it into the second processing feature based on the first processing feature, and then process it into the third processing feature based on the second processing feature, and repeat this process until the processing of the part to be processed is completed. Set the processing tolerance requirements for the processing features according to the processing quality requirements of the part to be processed, so that the final processed parts meet the quality requirements.

[0022] Step 3, according to step 2, the machining allowance of a certain machining feature after completing a certain process is defined as a process feature, and the theoretical characteristics of the process feature and the corresponding machining tolerance requirements are obtained. Specifically, each machining feature requires multiple processes to complete, and there is a machining allowance after each process is completed. The machining allowance after each process is completed is defined as a process feature. The defined process feature is the theoretical process feature, and then the machining tolerance requirements of the process feature are set according to the machining tolerance requirements of the machining feature.

[0023] Step 4: Based on step 3, the corresponding actual features of the process features are detected, and the theoretical features of the process features and the actual features of the process features are calculated to obtain the processing error of the process features. Specifically, the process features can be detected by on-machine measurement and other detection methods to obtain the actual features of the process features. After the actual features of the process features are matched one by one with the theoretical features of the process features, the error is calculated to finally obtain the processing error of the process features.

[0024] Step 5, compare the machining error of the process feature in step 4 with the machining tolerance of the process feature in step 3 to obtain the process quality evaluation result. Specifically, after obtaining the machining error of the process feature, it is compared and calculated with the set process feature machining tolerance to evaluate the process quality of the current process. When the process quality evaluations of multiple parts and multiple processes are summarized, the evolution law of the machining process quality can be obtained.

[0025] By calculating the machining allowance of a certain machining feature after completing a certain process, the process feature is defined, so as to obtain the theoretical feature of the process feature, and the machining tolerance of the process feature is set according to the actual production needs. The theoretical feature of the process feature is set and the actual feature of the process feature is detected to obtain the machining error of the process feature. The machining error of the process feature and the machining tolerance of the process feature are compared to obtain the machining process quality evaluation result, which can effectively evaluate the machining quality of the current process. Real-time monitoring of the machining process quality evaluation result can find the machining process that may cause unqualified parts at the first time, and the equipment operation can be suspended in time, and the process can be repaired separately, which can reduce the number of unqualified products and save time and resources for equipment maintenance. After the data accumulates to a certain extent, it can reflect the evolution law of the machining process quality, and can provide rich and reliable evaluation data for the quality control of the flexible production line, laying a solid foundation for improving the quality control ability. For example, it can determine how long each process can remain problem-free after the overhaul, and the positive impact on each process after the overall maintenance of the equipment, so as to formulate the maintenance or overhaul cycle of the equipment and each process.

[0026] As an optional implementation, refer to Figure 2 , providing a flexible production line process quality evaluation method, further comprising:

[0027] Step 6, based on step 3, the process characteristics are associated with the processing capabilities of the corresponding processing equipment to obtain the processing capability evaluation characteristics. Specifically, each process characteristic requires corresponding processing equipment to be processed, and the process characteristics can also reflect the processing capabilities of the corresponding processing equipment for processing the process characteristics to a certain extent. By associating some representative process characteristics with the performance of the processing capabilities of the corresponding processing equipment, the corresponding processing capability evaluation characteristics that can be used to evaluate the processing capabilities can be obtained.

[0028] Step 7, setting the theoretical processing capability evaluation characteristics and processing tolerance requirements of the corresponding processing equipment based on step 6. After selecting the processing capability evaluation characteristics, set the ideal value of the processing capability evaluation characteristics, that is, assume the processing capability of the equipment in a perfect state, and set a tolerance requirement as needed.

[0029] Step 8, according to step 4, the actual processing capability evaluation characteristics of the corresponding processing equipment are obtained, and the actual processing capability evaluation characteristics of the corresponding processing equipment and the theoretical processing capability evaluation characteristics of the corresponding processing equipment in step 7 are calculated to obtain the processing error of the processing capability evaluation characteristics. Specifically, the process characteristics are detected by on-machine measurement and other detection methods to obtain the actual characteristics of the process characteristics, and the characteristics associated with the processing capability are selected, which are the actual characteristics of the processing capability evaluation characteristics. Then, the actual processing capability evaluation characteristics of the corresponding processing equipment are compared and calculated with the theoretical processing capability evaluation characteristics of the corresponding processing equipment to obtain the processing error of the processing capability evaluation characteristics.

[0030] Step 9, compare the machining error of the machining capability evaluation feature in step 8 with the machining tolerance of the machining capability evaluation feature in step 7 to obtain the machining capability evaluation result. Specifically, after obtaining the machining error of the machining capability evaluation feature, compare and calculate it with the machining tolerance of the machining capability evaluation feature to evaluate the machining capability of the corresponding machining equipment. When multiple evaluations are summarized, the variation pattern of the machining capability can be obtained.

[0031] In this embodiment, by selecting the processing capability evaluation feature from the process feature, the theoretical feature and processing tolerance of the processing capability evaluation feature are set as needed. The actual feature of the processing capability evaluation feature is obtained by detection, and the theoretical feature of the processing capability evaluation feature is compared and calculated with the actual feature of the processing capability evaluation feature to obtain the processing error. By comparing and calculating the processing tolerance and the processing error, the processing capability of the corresponding processing equipment can be evaluated. When multiple evaluations are summarized, the change law of the processing capability can be obtained. Then, the processing capability of the subsequent process of the current part and the current process of the subsequent part can be evaluated. Combined with the above-mentioned evaluation of the process quality of the current process, it can provide rich and reliable evaluation data for the quality control and equipment maintenance of the flexible production line, laying a solid foundation for improving quality control and equipment maintenance capabilities.

[0032] As an optional implementation, a specific composition of the processing capability evaluation characteristics of the corresponding processing equipment is provided, including: the X-direction processing capability evaluation characteristics, the Y-direction processing capability evaluation characteristics and the Z-direction processing capability evaluation characteristics of the CNC machine tool. In this embodiment, when the CNC machine tool is used as the corresponding processing equipment, the processing capability is divided into the X-direction processing capability, the Y-direction processing capability and the Z-direction processing capability. When selecting in the process characteristics, the processing capability is rotated in multiple directions to obtain the X-direction processing capability evaluation characteristics, the Y-direction processing capability evaluation characteristics and the Z-direction processing capability evaluation characteristics, so that the capability evaluations of multiple directions can be obtained. When a problem occurs or when performing later maintenance, the specific directions can be maintained separately, without the need for consistency maintenance of the entire machine.

[0033] As an optional implementation, a specific process feature for associating process features with the processing capability evaluation features in the X, Y and Z directions of a numerically controlled machine tool is provided, including: associating the process feature with the processing capability evaluation feature in the X direction of the numerically controlled machine tool in step 6 includes: selecting the rib position of the rib feature distributed along the Y direction in the process feature, and / or the rib width as the processing capability evaluation feature in the X direction; associating the process feature with the processing capability evaluation feature in the Y direction of the numerically controlled machine tool in step 6 includes: selecting the rib position of the rib feature distributed along the X direction in the process feature, and / or the rib width as the processing capability evaluation feature in the Y direction; associating the process feature with the processing capability evaluation feature in the Z direction of the numerically controlled machine tool in step 6 includes: selecting the wall thickness of the web feature distributed along the XY plane in the process feature as the processing capability evaluation feature in the Z direction. In this embodiment, process features capable of evaluating the processing capability are selected in the X, Y and Z directions of the numerically controlled machine tool, so that the X, Y and Z directions of the numerically controlled machine tool can all be evaluated, and the evaluation system of the equipment is improved.

[0034] As an optional implementation, a specific process feature is provided for associating a process feature with a processing capability evaluation feature of a numerically controlled machine tool in the X direction, further comprising: selecting the hole positions of the hole features distributed along the XY plane in the process feature as the processing capability evaluation feature in the X direction. In this embodiment, some process features that can reflect the processing capability in the X direction are added as the processing capability evaluation feature in the X direction of the numerically controlled machine tool. In this way, the processing capability evaluation features are enriched, thereby obtaining a more comprehensive processing capability evaluation.

[0035] As an optional implementation, a specific process feature is provided for associating a process feature with a processing capability evaluation feature of a CNC machine tool in the Y direction, further comprising: selecting the hole position of the hole feature distributed along the XY plane in the process feature as the processing capability evaluation feature in the Y direction. In this embodiment, some process features that can reflect the processing capability in the Y direction are added as the processing capability evaluation feature in the Y direction of the CNC machine tool. In this way, the processing capability evaluation features are enriched, thereby obtaining a more comprehensive processing capability evaluation.

[0036] As an optional implementation, a specific process feature is provided for associating process features with the processing capability evaluation feature of the CNC machine tool in the Z direction, and further includes: selecting the rib top height of the rib feature distributed along the XY plane in the process feature as the processing capability evaluation feature in the Z direction; selecting the boss plane position of the boss feature distributed along the XY plane in the process feature as the processing capability evaluation feature in the Z direction. In this embodiment, some process features that can reflect the processing capability in the Z direction are added as the processing capability evaluation feature in the Z direction of the CNC machine tool. In this way, the processing capability evaluation features are enriched, so as to obtain a more comprehensive processing capability evaluation.

[0037] As an optional implementation, a specific setting method of the machining tolerance of the machining capability evaluation feature of the corresponding machining equipment is provided, including: scaling the machining tolerance of the process feature corresponding to the current process and using it as the machining tolerance of the machining capability evaluation feature. In this embodiment, by scaling the machining tolerance of the process feature of the current process and using it as the machining tolerance of the machining capability evaluation feature, the machining capability of the equipment for machining the current process can be evaluated, which can be used to assess whether the equipment can be used for machining of subsequent parts in the current process.

[0038] As an optional implementation, a specific setting method of the machining tolerance of the machining capability evaluation feature of the corresponding machining equipment is provided, including: scaling the machining tolerance of the process feature corresponding to the next process and using it as the machining tolerance of the machining capability evaluation feature. In this embodiment, by scaling the machining tolerance of the process feature corresponding to the next process and using it as the machining tolerance of the machining capability evaluation feature, the machining capability of the next process of the equipment for machining the current part can be evaluated, which can be used to evaluate whether the equipment can be used for machining the next process of the current part.

[0039] As an optional implementation, a specific setting method of the machining tolerance of the machining capability evaluation feature of the corresponding machining equipment is provided, including: scaling the machining tolerance of the process feature corresponding to the finishing process as the machining tolerance of the machining capability evaluation feature. In this embodiment, by scaling the machining tolerance of the process feature corresponding to the finishing process as the machining tolerance of the machining capability evaluation feature, the machining capability of the equipment for the finishing process can be evaluated, which can be used to evaluate whether the equipment can be used for the processing of all processes of the current part.

[0040] Reference Figure 3 The specific application process of a flexible production line process quality evaluation method disclosed in this application in practical application is as follows, taking the use of a five-axis CNC machine tool to process a preset part as an example:

[0041] Before machining the parts, the digital model of the parts to be machined and its machining quality requirements are expressed in the form of visual graphics and / or text. The machining process is designed based on the digital model of the parts to be machined and its machining quality requirements, and the entire machining process is broken down into a set of machining features. The set of machining features is expressed as:

[0042] F={f i |i=1,2,…,m},

[0043] Among them, m is the number of features.

[0044] According to the processing technology plan, calculate the feature processing allowance t of the i-th processing feature after the j-th process is completed i,j, which is defined as the process feature, and the process feature set is obtained as:

[0045] P = {p i,j |i=1,2,…,m; j=1,2,…,n},

[0046] Where n represents the number of processing steps.

[0047] According to the processing quality requirements of the parts to be processed, the processing tolerance requirements for the processing features are set as follows:

[0048] T p,i,j =[-l i,j ,u i,j ],

[0049] Among them, l i,j and u i,j They are process characteristics p i,j The lower and upper deviations.

[0050] The process characteristics are associated with the machining capabilities of the five-axis CNC machine tool in each direction (X, Y and Z). For the jth process, in the process feature set P, the process characteristics that can reflect the machining capabilities of the five-axis CNC machine tool in each direction (X, Y and Z) are selected as the machining capability evaluation features for evaluating the machining capability. The X-axis direction machining capability evaluation feature set is:

[0051]

[0052] in, It represents the evaluation feature of the machining capability in the X-axis direction of the machine tool in the jth process, which is taken as the process feature p i,j The quality characteristics of the machine tool's X-axis processing capability can be reflected in R X represents the machining capability evaluation feature set of the machine tool in the X-axis direction. Similarly, the machining capability evaluation feature set R of other axis directions can be defined Y ,R Z , forming a characteristic set of machining capabilities in each axis direction of the machine tool:

[0053] R={R X ,R Y ,R Z}.

[0054] When selecting process characteristics that can reflect the machining capabilities of five-axis CNC machine tools in each direction (X, Y and Z) as machining capability evaluation characteristics for evaluating machining capabilities:

[0055] The following process features can be selected as the evaluation features of the machining capability of the machine tool in the X-axis direction: the quality characteristics of the rib position and rib width of the rib features distributed roughly along the Y direction; the quality characteristics of the hole position of the hole features distributed roughly along the XY plane. The following process features can be selected as the evaluation features of the machining capability of the machine tool in the Y-axis direction: the quality characteristics of the rib position and rib width of the rib features distributed roughly along the X direction; the quality characteristics of the hole position of the hole features distributed roughly along the XY plane. The following process features can be selected as the evaluation features of the machining capability of the machine tool in the Z-axis direction: the quality characteristics of the wall thickness of the web features distributed roughly along the XY plane; the quality characteristics of the rib top height of the rib features distributed roughly along the XY plane; the quality characteristics of the boss plane position of the boss features distributed roughly along the XY plane.

[0056] Set the machining tolerance requirements of the machining capability evaluation feature as needed, and the machining capability evaluation feature in the X-axis direction of the machine tool Specifically:

[0057]

[0058] in, and Characteristics The lower and upper deviations of Machining tolerance requirements

[0059] Setting different machining tolerances for machining capability evaluation features can evaluate different dimensions of the equipment's machining capability. Taking the X-axis as an example, the specific dimensions are:

[0060] After scaling the machining tolerance of the process feature corresponding to the current process, the machining tolerance used as the machining capability evaluation feature is:

[0061]

[0062] Among them, α is the scaling factor, which can be α≤1. When this method is selected, the processing capability of the five-axis CNC machine tool evaluated based on this feature is the processing capability for the current process, which can be used to evaluate whether the machine tool can be used for the processing of subsequent parts in the current process.

[0063] After scaling the machining tolerance of the corresponding process feature of the next process, the machining tolerance used as the machining capability evaluation feature is:

[0064]

[0065] Where β is the scaling factor, which can be 0.5≤β≤1.5. When this method is selected, the machine tool processing capability evaluated based on this feature is the processing capability for the next process, which can be used to evaluate whether the machine tool can be used for the next process of the current part.

[0066] After scaling the machining tolerance of the process feature corresponding to the finishing operation, the machining tolerance used as the machining capability evaluation feature is:

[0067]

[0068] Among them, γ is the scaling factor, which can be 0.5≤γ≤1.5. When this method is selected, the machine tool processing capability evaluated based on this feature is the processing capability for the finishing process, which can be used to evaluate whether the machine tool can be used for all processes of the current part.

[0069] The processing accuracy of process characteristics represents the processing quality of the current process, while the processing accuracy of processing capability evaluation characteristics represents the processing capability of the current equipment for the subsequent process or subsequent parts of the current part. Both reflect the process quality control capability of the flexible production line from different dimensions. The process characteristics and processing capability evaluation characteristics can be detected between processing procedures. Define the union of the process feature set P and the processing capability evaluation feature set R as the process quality detection feature set Q, that is:

[0070] Q=P∪R={q k |k=1,2,…,N},

[0071] Among them, N represents the number of process quality detection features, the first m elements of Q are process features, and the last Nm elements are processing capability evaluation features. k Discrete into process quality detection feature point cloud C k , and then form the process quality detection feature point cloud set C, that is:

[0072] C={C k |k=1,2,…,N}.

[0073] Using on-machine measurement and other detection methods, after the current processing step is completed, the process quality detection feature point cloud set C is measured, and the process quality detection feature measured point cloud set is collected, which is recorded as CM. Specifically:

[0074] CM={CM k |k=1,2,…,N}.

[0075] Evaluate the process quality data. The process quality data evaluation is divided into two parts:

[0076] According to the process quality detection characteristics, the first m elements CM in the measured point cloud CM k , k = 1, 2, ... m, calculate the process feature processing error:

[0077] e p,i,j =E P (pi,j ,CM k ),

[0078] Among them, E P Indicates the calculation method of process feature processing error, which depends on the actual feature category. According to the process feature processing error e p,i,j and machining tolerance T p,i,j By performing comparative calculations, the process characteristic machining quality of the current operation can be evaluated.

[0079] According to the process quality detection characteristics, the last Nm elements CM in the measured point cloud CM k ,k=m+1,m+2,…,N, calculate the processing error of the processing capability evaluation feature:

[0080] e r,i,j =E R (r i,j ,CM k ),

[0081] Among them, E R The calculation method of machining error of machining capability evaluation feature depends on the actual feature category. r,i,j and machining tolerance T r,i,j , the processing capability of current processing equipment can be evaluated.

[0082] The patent of this invention defines the process quality detection feature on the basis of the process characteristics and the processing capability evaluation features. Through the detection and analysis of this feature, the evaluation of the process characteristic processing quality of the process and the processing capability of the processing equipment can be realized. The defined process characteristics and their detection data can effectively evaluate the processing quality of the current process and reflect the evolution law of the quality of the processing process; the defined processing capability evaluation features and their detection data can effectively evaluate the processing capability of the current processing equipment and reflect the change law of the processing capability of the production line processing equipment, and then evaluate the processing capability of the subsequent process of the current part and the current process of the subsequent part. The combination of the two provides rich and reliable evaluation data for the quality control and equipment maintenance of the flexible production line, and lays a solid foundation for providing quality control and equipment maintenance capabilities.

[0083] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A flexible production line process quality evaluation method, characterized in that: include: Obtain the digital model of the parts to be processed and its processing quality requirements; Obtaining the machining features of the part to be machined and the machining tolerance of the part to be machined according to the digital model of the part to be machined and its machining quality requirements; According to the machining features of the to-be-machined part and the machining tolerance of the to-be-machined part, the machining allowance of the machining features after completing a certain process is defined as a process feature, and the theoretical features of the process feature and the machining tolerance of the process feature are obtained; Detecting the actual feature of the process feature, and obtaining the machining error of the process feature according to the theoretical feature of the process feature and the actual feature of the process feature; Comparing the machining error of the process feature with the machining tolerance of the process feature to obtain a machining process quality evaluation result; Associating the process characteristics with the processing capability of the corresponding processing equipment to obtain processing capability evaluation characteristics; wherein the processing capability evaluation characteristics include: X-direction processing capability evaluation characteristics, Y-direction processing capability evaluation characteristics and Z-direction processing capability evaluation characteristics of the CNC machine tool; Setting a theoretical characteristic of the machining capability evaluation feature and a machining tolerance of the machining capability evaluation feature; According to the actual characteristics of the process characteristics and the process characteristics and the processing capability of the corresponding processing equipment, the actual characteristics of the processing capability evaluation characteristics are obtained; Obtaining a machining error of the machining capability evaluation feature according to an actual feature of the machining capability evaluation feature and a theoretical feature of the machining capability evaluation feature; The machining error of the machining capability evaluation feature and the machining tolerance of the machining capability evaluation feature are compared to obtain a machining capability evaluation result.

2. The flexible production line process quality evaluation method according to claim 1, characterized in that: The X-direction machining capability evaluation features of the CNC machine tool include: the rib position and / or rib width of the rib features distributed along the Y direction in the process features; The Y-direction machining capability evaluation features of the CNC machine tool include: the rib position and / or rib width of the rib features distributed along the X-direction in the process features; The Z-direction machining capability evaluation feature of the numerical control machine tool includes: the wall thickness of the web feature distributed along the XY plane in the process feature.

3. The flexible production line process quality evaluation method as claimed in claim 2, characterized in that: The X-direction machining capability evaluation features of the CNC machine tool also include: The hole positions of the hole features distributed along the XY plane in the process feature.

4. The flexible production line process quality evaluation method as claimed in claim 2, characterized in that: The Y-direction machining capability evaluation features of the CNC machine tool also include: The hole positions of the hole features distributed along the XY plane in the process feature.

5. The flexible production line process quality evaluation method as claimed in claim 2, characterized in that: The Z-direction machining capability evaluation features of the CNC machine tool also include: The rib top height of the rib feature distributed along the XY plane in the process feature; The boss plane position of the boss feature distributed along the XY plane in the process feature.

6. The flexible production line process quality evaluation method according to claim 1, characterized in that: Setting the machining tolerance of the machining capability evaluation feature includes: After scaling the machining tolerance of the process feature corresponding to the current process, the machining tolerance of the machining capability evaluation feature is obtained.

7. The flexible production line process quality evaluation method according to claim 6, characterized in that: Setting the machining tolerance of the machining capability evaluation feature also includes: After scaling the machining tolerance of the process feature corresponding to the next process, the machining tolerance of the machining capability evaluation feature is obtained.

8. The flexible production line process quality evaluation method according to claim 1, characterized in that: Setting the machining tolerance of the machining capability evaluation feature includes: After scaling the machining tolerance of the process feature corresponding to the finishing operation, the machining tolerance of the machining capability evaluation feature is obtained.

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