Engineering truck brake production quality tracing method

Abstract

The invention relates to the technical field of production quality tracing, and particularly discloses an engineering vehicle brake production quality tracing method, which comprises the following steps: S1, dividing the production process of a brake into a plurality of process parts, and obtaining process indexes of the process parts; obtaining an index range of the process index; s2, all test index values of the brake are obtained when all the process indexes are qualified, and a standard index area is obtained; s3, obtaining all corresponding test index values when the rest of the process parts are qualified index values and the process parts are different index values, and obtaining n test index change curves of the process parts; analyzing the test index change curve, and selecting the change test index of the process part; s4, a current index area of the brake is obtained; and comparing the current index area with a standard index area, and determining an abnormal process part according to a comparison result.

Description

Technical Field

[0001] The invention relates to the technical field of production quality tracing, and in particular to a production quality tracing method for engineering vehicle brakes. Background Art

[0002] The production quality traceability system is a system used to collect, manage and analyze information from all links in the product production process. It can trace the entire process from raw material procurement to product delivery; it can help optimize the production process and reduce the defective product rate.

[0003] In the existing technology, when engineering brakes are produced, the production quality of the brakes is often ensured by continuously repairing and inspecting the process equipment. However, there are a large number of process equipment, the method of continuous maintenance is relatively complicated, and the key factors affecting the production quality of the brakes cannot be accurately determined, resulting in low efficiency in improving production quality. Therefore, it is necessary to use effective data analysis methods based on the test results of the post-production test items to trace the process parts with abnormalities in order to improve production quality. Summary of the invention

[0004] The purpose of the present invention is to provide a method for tracing the production quality of engineering vehicle brakes to solve the above technical problems.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A method for tracing the production quality of engineering vehicle brakes comprises the following steps: Step S1: Divide the production process of the brake into several process parts, and obtain the process indicators of the process parts; obtain the indicator range [Imin, Imax] of the process indicators, wherein Imax is the qualified indicator value corresponding to when the process part just reaches the qualified level; Obtain all test items after the brake is produced, each test item corresponds to a test index value; obtain the number n of test index values, and establish a polygonal model with n sides and equal lengths of each side; obtain the center point and vertex of the polygonal model, obtain the lines connecting each vertex and the center point, and obtain a number of index lines; on the i-th index line, the test index value corresponding to the center point is recorded as 0, and the test index value corresponding to the vertex is recorded as Timax, where Timax is the preset maximum test index value of the i-th test item; Step S2: When all process indicators satisfy Ii≥Iimax, where Ii represents the process indicator of the i-th process part, and Iimax represents the qualified indicator value corresponding to when the i-th process part just reaches the qualified level, the test indicator value of each test item at this time is obtained, and the indicator point is determined on the corresponding indicator line according to the test indicator value; all indicator points in the polygonal model are connected to obtain the indicator area, and the indicator area at this time is recorded as the standard indicator area; Step S3: Select several index values ​​at equal intervals within the index range, obtain all test index values ​​corresponding to the process part at different index values ​​when the rest of the process parts are at qualified index values, and obtain n test index change curves of the process part; obtain the mean slope k of each test index change curve, obtain the test index value corresponding to the index change curve that satisfies |k|≥kt, where kt is a preset slope threshold, and record the test index value as the dependent test index of the process part; Step S4: After the brake production is completed, the test index values ​​of various test items of the brake are obtained, and the index area is obtained, which is recorded as the current index area; the current index area is compared with the standard index area, and the process part with abnormalities is determined according to the comparison result.

[0006] As a further solution of the present invention: the division process of the process part includes: According to the different operations performed on the brake during the production process of the brake, all the operation parts of the brake production process are obtained; using computer vision technology, the operation parts in which the shape or surface of the brake changes are selected from all the operation parts and recorded as the process part of the brake production process.

[0007] As a further solution of the present invention: the process of obtaining the indicator range of the process indicator includes: Obtain historical data of the process part, which is all process indicators generated by the process part in the past; select the minimum value in the historical data, recorded as Imin, and obtain the indicator range based on the qualified indicator value Imax corresponding to when the process part just reaches the qualified level.

[0008] As a further solution of the present invention: the process of obtaining the mean slope includes selecting several monitoring points on the test indicator change curve, obtaining the slope at each monitoring point, and obtaining the average value of all slopes, which is recorded as the mean slope of the test indicator change curve.

[0009] As a further solution of the present invention: the process of comparing the results includes: Obtain the center points of the current indicator area and the standard indicator area, and record them as the current center point and the standard center point respectively, and overlap the current center point and the standard center point; in the current indicator area and the standard indicator area, establish a rectangular coordinate system with the positions of the two overlapping centers as the origin, then the current indicator area and the standard indicator area can be regarded as point sets on the rectangular coordinate system, record the point set corresponding to the current indicator area as J, record the point set corresponding to the standard indicator area as K, then get the set Q=(J∪K)-(J∩K), and get the comparison set R=Q-(J∩Q), the comparison result is the comparison set.

[0010] As a further solution of the present invention: the process of determining the dependent test index according to the comparison result includes: Obtain the expression corresponding to each indicator line in the rectangular coordinate system, record the expression of the nth indicator line as Ln, and obtain the expression set F={L1, L2, ..., Ln} of the indicator line; obtain the intersection of the comparison set and the expression set, obtain the test indicator value corresponding to the fragment of each indicator line in the intersection, record it as abnormal test indicator value, and obtain the abnormal indicator set; obtain the dependent indicator of each process part, obtain the dependent indicator set of each process part, and obtain the process part where the abnormal indicator set and the dependent indicator set have an intersection, record it as the process part with abnormality.

[0011] As a further solution of the present invention: when the number of test items is less than or equal to 2, and when the rest of the process parts are at qualified index values, all the test index values ​​corresponding to the process parts when they are at different index values ​​are obtained to obtain a standard test value sequence; all the current test index values ​​of the brake are obtained to obtain a current test value sequence; determine the process part with abnormality according to the standard test value sequence and the current test value sequence.

[0012] As a further solution of the present invention: the process of determining the process part with abnormality according to the standard test value sequence and the current test value sequence includes: Select the test indicator values ​​in the standard test value sequence that are less than the corresponding test indicator values ​​in the current test value sequence, record them as abnormal test indicator values, and obtain a new abnormal indicator set; obtain the process part where the new abnormal indicator set and the dependent indicator set have an intersection, and record them as the process part with the abnormality.

[0013] Beneficial effects of the present invention: Compared with the prior art, the present invention can monitor each link in the production process more finely by dividing the production process of the brake into several process parts and obtaining the process indicators and test indicator values ​​of each process part. This helps to discover and correct potential quality problems in a timely manner, thereby improving the consistency and reliability of the product. By establishing a polygonal model and mapping the test indicator values ​​to the vertices of the polygonal model, the relationship between different test items can be intuitively displayed. When a certain indicator exceeds the qualified standard range, the abnormal process part can be quickly located by comparing the standard indicator area and the current indicator area, which is convenient for targeted fault diagnosis and processing. By analyzing the change curves of each test indicator, the degree of influence of different process parameters on product performance can be understood. This helps engineers adjust and optimize the production process to reduce the defective rate and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below in conjunction with the accompanying drawings.

[0015] Figure 1 The present invention is a flowchart of a method for tracing the production quality of an engineering vehicle brake. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1 As shown, the present invention is a method for tracing the production quality of engineering vehicle brakes, comprising the following steps: Step S1: Divide the production process of the brake into several process parts, and obtain the process indicators of the process parts; obtain the indicator range [Imin, Imax] of the process indicators, wherein Imax is the qualified indicator value corresponding to when the process part just reaches the qualified level; Obtain all test items after the brake is produced, each test item corresponds to a test index value; obtain the number n of test index values, and establish a polygonal model with n sides and equal lengths of each side; obtain the center point and vertex of the polygonal model, obtain the lines connecting each vertex and the center point, and obtain a number of index lines; on the i-th index line, the test index value corresponding to the center point is recorded as 0, and the test index value corresponding to the vertex is recorded as Timax, where Timax is the preset maximum test index value of the i-th test item; It should be noted that the process index is a parameter standard after the process part operation is completed; for example, when the process part is grinding, the polishing degree after grinding; when the process part is heating, the temperature after heating; when the process part is assembly, the tightness after assembly; It is understandable that after the production is completed, the brake will be fully tested, covering all preset test items, each test item has a corresponding test index value, and different process indicators of the process part will affect the final test standard value; and a polygonal model is introduced, at the center point of the polygonal model, all test index values ​​are initialized to 0, and the vertex corresponds to the maximum test index value of each test item; the maximum test index value is the maximum value of the test index value of this test item appearing in the historical test data; the test index value of each test item can be represented by the position on the index line in the polygonal model, which is convenient for visual monitoring and analysis; As a preferred embodiment of the present invention, the division process of the process part includes: According to different operations performed on the brake during the production process of the brake, all the operation parts of the brake production process are obtained; using computer vision technology, the operation parts where the shape or surface of the brake changes are selected from all the operation parts and recorded as the process part of the brake production process; It should be noted that, first of all, according to the entire production process of the brake, all the operation steps involved are recorded; these operations may include but are not limited to casting, machining, heat treatment, surface treatment, assembly, etc.; each operation will have a certain impact on the appearance or surface characteristics of the brake; the specific impact of these operations on the brake appearance or surface is analyzed through computer vision technology; computer vision technology uses a camera to capture images before and after the operation, and uses image processing algorithms to compare the differences, so as to identify which operations have caused significant physical changes; these changes may be size adjustments, shape modifications, or changes in surface texture; operations that cause significant changes in the brake appearance or surface are defined as process parts; As a preferred embodiment of the present invention, the process of obtaining the indicator range of the process indicator includes: Obtain historical data of the process part, wherein the historical data is all process indicators generated by the process part in the past; select the minimum value from the historical data, recorded as Imin, and obtain the indicator range according to the qualified indicator value Imax corresponding to when the process part just reaches the qualified level; It can be understood that the qualified index value Imax represents the minimum requirement for the process part to stably produce qualified products; the test index value of the brake produced within the index range [Imin, Imax] will have a large change, which is convenient for analyzing the process index that affects the test index value; Step S2: When all process indicators satisfy Ii≥Iimax, where Ii represents the process indicator of the i-th process part, and Iimax represents the qualified indicator value corresponding to when the i-th process part just reaches the qualified level, the test indicator value of each test item at this time is obtained, and the indicator point is determined on the corresponding indicator line according to the test indicator value; all indicator points in the polygonal model are connected to obtain the indicator area, and the indicator area at this time is recorded as the standard indicator area; It can be understood that each point on the index line represents a test index value; the results of various test items of the brake can be intuitively seen through the polygonal model, and the standard index area is used as a benchmark for judging the quality of the currently produced brakes. It is the ideal distribution range of various test index values ​​of the brake, which helps to identify deviations from normal process conditions; Step S3: Select several index values ​​at equal intervals within the index range, obtain all test index values ​​corresponding to the process part at different index values ​​when the rest of the process parts are at qualified index values, and obtain n test index change curves of the process part; obtain the mean slope k of each test index change curve, obtain the test index value corresponding to the index change curve that satisfies |k|≥kt, where kt is a preset slope threshold, and record the test index value as the dependent test index of the process part; It can be understood that, by using the control variable method, the influence of each process indicator on the test indicator value is obtained in turn, and the test indicator change curve that satisfies |k|≥kt indicates that the change of the current process indicator will significantly affect the test indicator value corresponding to the test indicator change curve; the mean slope represents the sensitivity of the test indicator value to the change of the process indicator; As a preferred embodiment of the present invention, the process of obtaining the mean slope includes selecting a number of monitoring points on the test index change curve, obtaining the slope at each monitoring point, and obtaining the average value of all slopes, which is recorded as the mean slope of the test index change curve; It is worth noting that the mean slope is calculated as the arithmetic mean of all slopes. The mean slope is a comprehensive indicator that can help understand the changing trend of the test indicator value in the entire process. If the mean slope is large, it means that the test indicator is very sensitive to the change of process parameters; otherwise, it is not so sensitive. Step S4: After the brake production is completed, the test index values ​​of various test items of the brake are obtained, and the index area is obtained, which is recorded as the current index area; the current index area is compared with the standard index area, and the process part with abnormality is determined according to the comparison result; It is understandable that by comparing the two indicator areas, the difference between the current indicator area and the standard indicator area can be found; if the current indicator area exceeds the range of the standard indicator area, or the shape has changed significantly, this may indicate that there is a problem or abnormality in some process parts; As a preferred embodiment of the present invention, the process of comparing the results includes: Obtain the center points of the current indicator area and the standard indicator area, and record them as the current center point and the standard center point respectively, and overlap the current center point and the standard center point; in the current indicator area and the standard indicator area, take the positions of the two overlapping centers as the origin to establish a rectangular coordinate system, then the current indicator area and the standard indicator area can be regarded as point sets on the rectangular coordinate system, record the point set corresponding to the current indicator area as J, record the point set corresponding to the standard indicator area as K, then obtain the set Q=(J∪K)-(J∩K), and obtain the comparison set R=Q-(J∩Q), the comparison result is the comparison set; The process of determining dependent test indicators based on the comparison results includes: Obtain the expression corresponding to each indicator line in the rectangular coordinate system, record the expression of the nth indicator line as Ln, and obtain the expression set F={L1, L2, ..., Ln} of the indicator line; obtain the intersection of the comparison set and the expression set, obtain the test indicator value corresponding to the fragment of each indicator line in the intersection, record it as the abnormal test indicator value, and obtain the abnormal indicator set; obtain the dependent indicator of each process part, obtain the dependent indicator set of each process part, and obtain the process part where the abnormal indicator set and the dependent indicator set have an intersection, record it as the process part with abnormality; It can be understood that the purpose of overlapping the two center points is to align the two indicator areas for the convenience of subsequent comparison and analysis; the obtained comparison set is the area where the test indicator value in the current indicator area is lower than the test indicator in the standard indicator area; by analyzing the intersection between the abnormal indicator set and the dependent indicator set, it is possible to identify which process parts have abnormalities and quickly locate production problems; As a preferred embodiment of the present invention, when the number of test items is less than or equal to 2, all test index values ​​corresponding to the process parts at different index values ​​when the other process parts are at qualified index values ​​are obtained to obtain a standard test value sequence; all current test index values ​​of the brake are obtained to obtain a current test value sequence; the process part with abnormality is determined according to the standard test value sequence and the current test value sequence; The process of determining the process part having an abnormality according to the standard test value sequence and the current test value sequence includes: Select the test index value in the standard test value sequence whose value is less than the corresponding test index value in the current test value sequence, record it as the abnormal test index value, and obtain a new abnormal index set; obtain the process part where the new abnormal index set and the dependent index set have an intersection, record it as the process part with abnormality; It is worth noting that when the number of test items is less than or equal to 2, a polygonal model cannot be constructed. At this time, the number of test index values ​​is also small. The sizes of elements at corresponding positions in the standard test value sequence and the current test value sequence can be directly compared. According to the comparison results, the test index values ​​of elements at corresponding positions lower than the standard test value sequence are selected and recorded as abnormal test index values, thereby determining the process part with abnormalities.

[0018] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for tracing the production quality of engineering vehicle brakes, characterized in that: The following steps are involved: Step S1: Divide the production process of the brake into several process parts, and obtain the process indicators of the process parts; obtain the indicator range [Imin, Imax] of the process indicators, wherein Imax is the qualified indicator value corresponding to when the process part just reaches the qualified level; Obtain all test items after the brake is produced, each test item corresponds to a test index value; obtain the number n of test index values, and establish a polygonal model with n sides and equal lengths of each side; obtain the center point and vertex of the polygonal model, obtain the lines connecting each vertex and the center point, and obtain a number of index lines; on the i-th index line, the test index value corresponding to the center point is recorded as 0, and the test index value corresponding to the vertex is recorded as Timax, where Timax is the preset maximum test index value of the i-th test item; Step S2: When all process indicators satisfy Ii≥Iimax, where Ii represents the process indicator of the i-th process part, and Iimax represents the qualified indicator value corresponding to when the i-th process part just reaches the qualified level, the test indicator value of each test item at this time is obtained, and the indicator point is determined on the corresponding indicator line according to the test indicator value; all indicator points in the polygonal model are connected to obtain the indicator area, and the indicator area at this time is recorded as the standard indicator area; Step S3: Select several index values ​​at equal intervals within the index range, obtain all test index values ​​corresponding to the process part at different index values ​​when the rest of the process parts are at qualified index values, and obtain n test index change curves of the process part; obtain the mean slope k of each test index change curve, obtain the test index value corresponding to the index change curve that satisfies |k|≥kt, where kt is a preset slope threshold, and record the test index value as the dependent test index of the process part; Step S4: After the brake production is completed, the test index values ​​of various test items of the brake are obtained, and the index area is obtained, which is recorded as the current index area; the current index area is compared with the standard index area, and the process part with abnormalities is determined according to the comparison result.

2. The method for tracing the production quality of engineering vehicle brakes according to claim 1 is characterized in that: In step S1, the division process of the process part includes: According to the different operations performed on the brake during the production process of the brake, all the operation parts of the brake production process are obtained; using computer vision technology, the operation parts in which the shape or surface of the brake changes are selected from all the operation parts and recorded as the process part of the brake production process.

3. The method for tracing the production quality of engineering vehicle brakes according to claim 1 is characterized in that: In step S1, the process of obtaining the indicator range of the process indicator includes: Obtain historical data of the process part, which is all process indicators generated by the process part in the past; select the minimum value in the historical data, recorded as Imin, and obtain the indicator range based on the qualified indicator value Imax corresponding to when the process part just reaches the qualified level.

4. The method for tracing the production quality of engineering vehicle brakes according to claim 1 is characterized in that: In step S3, the process of obtaining the mean slope includes selecting several monitoring points on the test index change curve, obtaining the slope at each monitoring point, and obtaining the average value of all slopes, which is recorded as the mean slope of the test index change curve.

5. The method for tracing the production quality of engineering vehicle brakes according to claim 1 is characterized in that: In step S4, the process of comparing the results includes: Obtain the center points of the current indicator area and the standard indicator area, and record them as the current center point and the standard center point respectively, and overlap the current center point and the standard center point; in the current indicator area and the standard indicator area, establish a rectangular coordinate system with the positions of the two overlapping centers as the origin, then the current indicator area and the standard indicator area can be regarded as point sets on the rectangular coordinate system, record the point set corresponding to the current indicator area as J, record the point set corresponding to the standard indicator area as K, then get the set Q=(J∪K)-(J∩K), and get the comparison set R=Q-(J∩Q), the comparison result is the comparison set.

6. The method for tracing the production quality of engineering vehicle brakes according to claim 5, characterized in that: In step S4, the process of determining the dependent test index according to the comparison result includes: Obtain the expression corresponding to each indicator line in the rectangular coordinate system, record the expression of the nth indicator line as Ln, and obtain the expression set F={L1, L2, ..., Ln} of the indicator line; obtain the intersection of the comparison set and the expression set, obtain the test indicator value corresponding to the fragment of each indicator line in the intersection, record it as abnormal test indicator value, and obtain the abnormal indicator set; obtain the dependent indicator of each process part, obtain the dependent indicator set of each process part, and obtain the process part where the abnormal indicator set and the dependent indicator set have an intersection, record it as the process part with abnormality.

7. The method for tracing the production quality of engineering vehicle brakes according to claim 1 is characterized in that: In step S4, when the number of test items is less than or equal to 2, and all test index values ​​corresponding to the process parts being at different index values ​​when the other process parts are at qualified index values ​​are obtained, and a standard test value sequence is obtained; all current test index values ​​of the brake are obtained to obtain a current test value sequence; and the process part with abnormalities is determined based on the standard test value sequence and the current test value sequence.

8. The method for tracing the production quality of engineering vehicle brakes according to claim 7 is characterized in that: In step S4, the process of determining the process part having an abnormality according to the standard test value sequence and the current test value sequence includes: Select the test indicator values ​​in the standard test value sequence that are less than the corresponding test indicator values ​​in the current test value sequence, record them as abnormal test indicator values, and obtain a new abnormal indicator set; obtain the process part where the new abnormal indicator set and the dependent indicator set have an intersection, and record them as the process part with the abnormality.

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