WO2023137850A1

WO2023137850A1 - Detection method and system for crimping state of connector, and controller and storage medium

Info

Publication number: WO2023137850A1
Application number: PCT/CN2022/080742
Authority: WO
Inventors: 李丹霞; 马军华; 王峰; 董典桥; 汪志坤; 杨政凯
Original assignee: 中兴通讯股份有限公司
Priority date: 2022-01-19
Filing date: 2022-03-14
Publication date: 2023-07-27
Also published as: CN116520202A

Abstract

A detection method and system for a crimping state of a connector, and a controller and a storage medium. The detection method is applied to a controller in a detection system. The detection system further comprises a crimping device. The detection method comprises: acquiring a displacement parameter and a crimping force parameter of a pressure head of a crimping device during the process of crimping a connector (S100); performing feature extraction processing on the displacement parameter and the crimping force parameter, so as to obtain a feature parameter (S200); and comparing the feature parameter with a preset feature parameter, and determining a crimping state of the connector according to a comparison result (S300).

Description

Method, controller, system and storage medium for detecting connector crimping state

Cross References to Related Applications

This application is based on a Chinese patent application with application number 202210060011.3 and a filing date of January 19, 2022, and claims the priority of this Chinese patent application. The entire content of this Chinese patent application is hereby incorporated by reference into this application.

technical field

The embodiments of the present application relate to but are not limited to the technical field of device detection, and in particular, relate to a method for detecting a crimped state of a connector, a controller, a system for detecting a crimped state of a connector, and a computer-readable storage medium.

Background technique

Connector crimping is a process technology that uses elastic deformable pins or hard pins to cooperate with PCB metallized holes to form close contact points between pins and metallized holes to achieve electrical interconnection. With the rapid development of information communication and electronic manufacturing industries, electronic products are constantly upgraded, and the requirements for high density, high precision and high reliability of connectors are increasing. The application of crimping technology is becoming more and more extensive, and it has gradually become the main assembly method of connectors.

At the same time, as electronic products have higher and higher requirements for signal transmission rates, and the system has continuously improved requirements for passive channels, the structure of crimped connectors has become more and more complicated, and the pins have become thinner, shorter, softer, and thinner. The difficulty of crimping and poor crimping have doubled. During the testing of the whole machine and the use of customers, there were abnormal product functions and even connector drop-offs due to connector crimping, incomplete crimping, etc.

For the problem of bad connector crimping, the current detection methods mainly include visual inspection, 3D X-ray test and ICT test. However, for the above-mentioned detection methods at present, there are often problems such as poor stability, high cost, slow detection speed or detection errors.

Contents of the invention

The following is an overview of the topics described in detail in this article. This summary is not intended to limit the scope of the claims.

Embodiments of the present application provide a method for detecting a crimping state of a connector, a controller, a system for detecting a crimping state of a connector, and a computer-readable storage medium.

In a first aspect, an embodiment of the present application provides a detection method for a crimping state of a connector, which is applied to a controller in a detection system. The detection system further includes a crimping device, and the controller communicates with the crimping device. The detection method includes: acquiring a displacement parameter and a crimping force parameter of a crimping head of the crimping device during crimping the connector; performing feature extraction processing on the displacement parameter and the crimping force parameter to obtain a feature parameter; comparing the feature parameter with a preset feature parameter, and determining the crimping state of the connector according to the comparison result.

In the second aspect, the embodiment of the present application also provides a controller, a memory, a processor, and a computer program stored on the memory and operable on the processor, and the processor implements the connector crimping state detection method described in the first aspect when executing the computer program.

In a third aspect, an embodiment of the present application further provides a detection system for a crimping state of a connector, including a crimping device and the controller described in the second aspect above, where the controller communicates with the crimping device.

In a fourth aspect, the embodiment of the present application further provides a computer-readable storage medium storing computer-executable instructions, the computer-executable instructions being used to execute the connector crimping state detection method described in the first aspect above.

Additional features and advantages of the application will be set forth in the description which follows, and, in part, will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solution of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical solution of the present application, and do not constitute a limitation to the technical solution of the present application.

Figure 1 is a schematic diagram of a connector crimping process;

Fig. 2 is a schematic diagram of a situation where the connector falls off;

FIG. 3 is a schematic diagram of a system architecture for performing a method for detecting a crimping state of a connector provided by an embodiment of the present application;

Fig. 4 is a flow chart of a method for detecting a connector crimping state provided by an embodiment of the present application;

FIG. 5 is a flowchart of obtaining a crimping curve in a method for detecting a crimping state of a connector provided by an embodiment of the present application;

Fig. 6 is a flow chart of performing feature extraction processing on crimping curves to obtain characteristic parameters in the detection method of connector crimping state provided by an embodiment of the present application;

Fig. 7 is a flowchart of judging the crimping state of the connector in the method for detecting the crimping state of the connector provided by an embodiment of the present application;

Fig. 8 is a flow chart of judging the crimping state of the connector in the method for detecting the crimping state of the connector provided by another embodiment of the present application;

FIG. 9 is a flowchart of judging the crimping state of the connector in the method for detecting the crimping state of the connector provided by another embodiment of the present application;

FIG. 10 is a flow chart of judging the crimping state of the connector in the method for detecting the crimping state of the connector provided by another embodiment of the present application;

Fig. 11 is a flow chart of obtaining preset characteristic parameters in a method for detecting a crimping state of a connector provided by an embodiment of the present application;

FIG. 12 is a flow chart of correcting preset characteristic parameters in a method for detecting a crimping state of a connector provided by an embodiment of the present application;

Fig. 13 is a schematic diagram of a crimping curve in a method for detecting a crimping state of a connector provided by an embodiment of the present application;

Fig. 14 is a schematic diagram of the size of the pins protruding from the PCB board surface in the method for detecting the crimping state of the connector provided by one embodiment of the present application;

FIG. 15 is a schematic structural diagram of a detection system for a connector crimping state provided by an embodiment of the present application;

Fig. 16 is a data block diagram of a detection system for a connector crimping state provided by an embodiment of the present application;

Fig. 17 is a schematic diagram of crimping standard curves P ₁ and P ₂ in the detection method of connector crimping state provided by an embodiment of the present application;

FIG. 18 is a comparative schematic diagram of connector crimping incomplete curves in the detection method of connector crimping state provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application.

It should be noted that although the functional modules are divided in the schematic diagram of the device, and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the flow chart. The terms "first", "second" and the like in the specification, claims or the above-mentioned drawings are used to distinguish similar objects, and not necessarily used to describe a specific order or sequential order.

In related technical solutions, as shown in Figure 1, connector crimping is a process technology that uses elastic deformable pins or hard pins to cooperate with PCB (Printed Circuit Board, printed circuit board) metallized holes to form close contact points between pins and metallized holes to realize electrical interconnection. With the rapid development of information communication and electronic manufacturing industries, electronic products are constantly upgraded, and the requirements for high density, high precision and high reliability of connectors are increasing. The application of crimping technology is becoming more and more extensive, and it has gradually become the main assembly method of connectors.

At the same time, as electronic products have higher and higher requirements for signal transmission rates, and the system has continuously improved requirements for passive channels, the structure of crimped connectors has become more and more complex, and the pins have become thinner, shorter, softer, and thinner. The difficulty of crimping and poor crimping have doubled. During the whole machine test and the customer's use process, there are abnormal product functions and even connector drop-offs due to connector crimping and incomplete crimping. Among them, the connector drop-off can be shown in Figure 2.

For the problem of bad connector crimping, the current detection methods mainly include visual inspection, 3D X-ray (Three-Dimensional X-ray, three-dimensional X-ray) test and ICT (In Circuit Tester, automatic online tester) test, etc. Visual inspection mainly relies on manual observation, which cannot accurately detect hidden defects such as kneeling stitches, and is affected by individual differences among inspectors, making it difficult to guarantee the consistency and stability of crimping quality. 3D X-ray testing technology uses X-rays to penetrate the device and PCB, and uses layered technology imaging to check whether the pins are inserted into the holes to detect whether the connector is crimped well. 3D X-ray equipment is expensive. For connectors with complex structures, it is easy to misjudge due to unclear imaging, and the detection speed is slow, which has a great impact on the production cycle, so the penetration rate in the workshop is low. ICT testing technology judges whether the connector crimping is normal by detecting whether the connector and the PCB are electrically interconnected, which is currently the most widely used detection method. This solution needs to develop a test fixture separately, and the detection effect is greatly affected by the precision of the fixture, and it is difficult to locate after the same network fault, especially for the fault that there is electrical interconnection but incomplete crimping cannot be effectively identified when the pin is connected to the PCB hole. There will be reliability problems that the function test in the factory is normal, the function is abnormal when it is sent to the user, and even the connector falls off.

In addition, the application of connector crimping curves is currently in its infancy. More and more crimping equipment supports crimp curve feedback. Some crimping equipment tries to optimize the crimping program settings through the crimping curve, and carry out early warning and interception of the bad crimping process. However, due to the introduction of tolerances such as PCB thickness, PCB warpage, and molds, the crimping curve will fluctuate, and the actual application effect is not good.

Based on the foregoing, embodiments of the present application provide a method for detecting a crimping state of a connector, a controller, a system for detecting a crimping state of a connector, and a computer-readable storage medium, wherein the method for detecting a crimping state of a connector is applied to a controller in the detection system, and the detection system further includes a crimping device, and the controller communicates with the crimping device. parameter to determine the crimp state of the connector based on the comparison result. According to the technical solution of the embodiment of the present application, the embodiment of the present application only needs to extract the characteristic parameters according to the displacement parameters and the crimping force parameters, and compare the characteristic parameters with the preset characteristic parameters to obtain the crimping state of the connector. Compared with the existing detection means, it can quickly and accurately detect the poor crimping of the connector, solve the problem of connector application reliability caused by incomplete crimping of the connector, and have important practicability in the quality control of connector crimping.

The embodiments of the present application will be further described below in conjunction with the accompanying drawings.

As shown in FIG. 3 , FIG. 3 is a schematic diagram of a system architecture 100 for performing a method for detecting a crimping state of a connector provided by an embodiment of the present application.

In the example of FIG. 3 , the system architecture 100 is provided with a processor 110 and a memory 120 , wherein the processor 110 and the memory 120 may be connected via a bus or in other ways, and in FIG. 3 the connection via a bus is taken as an example.

The memory 120, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory 120 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some implementations, the memory 120 may include memory 120 located remotely relative to the processor 110 , and these remote memories may be connected to the system architecture 100 through a network. Examples of the aforementioned networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

Those skilled in the art can understand that the system architecture 100 can be applied to 3G communication network systems, LTE communication network systems, 5G communication network systems and subsequent evolved mobile communication network systems, etc., which is not specifically limited in this embodiment.

Those skilled in the art can understand that the system architecture 100 shown in FIG. 3 does not limit the embodiment of the present application, and may include more or less components than shown in the figure, or combine some components, or arrange different components.

In the system architecture 100 shown in FIG. 3 , the processor 110 can call the detection program of the connector crimping state stored in the memory 120 , so as to execute the detection method of the connector crimping state.

Based on the system architecture 100 above, various embodiments of the method for detecting the crimping state of the connector of the present application are proposed below.

As shown in FIG. 4, FIG. 4 is a flowchart of a method for detecting a crimping state of a connector provided by an embodiment of the present application; the method for detecting a crimping state of a connector in an embodiment of the present application is applied to a controller in a detection system. Specifically, the detection system also includes a crimping device, and the controller communicates with the crimping device. The controller may include the processor and memory in FIG. 3, and the detection method includes but is not limited to steps S100, S200, and S300.

Step S100, obtaining displacement parameters and crimping force parameters of the crimping head of the crimping equipment during the process of crimping the connector;

Step S200, performing feature extraction processing on the displacement parameter and the crimping force parameter to obtain the feature parameter;

Step S300, comparing the characteristic parameters with preset characteristic parameters, and determining the crimping state of the connector according to the comparison result.

Specifically, in the process of crimping the connector to the PCB hole by the pressure head of the crimping equipment, the controller will obtain the displacement parameter and crimping force parameter during the crimping process of the connector, and then, the controller will perform feature extraction processing on the displacement parameter and crimping force parameter to obtain the characteristic parameter; finally, the controller will compare the characteristic parameter with the preset characteristic parameter to obtain the comparison result, and determine the crimping state of the connector according to the comparison result. According to the technical solution of the embodiment of the present application, the embodiment of the present application only needs to extract the characteristic parameters according to the displacement parameters and the crimping force parameters, and compare the characteristic parameters with the preset characteristic parameters to obtain the crimping state of the connector. Compared with the existing detection means, it can quickly and accurately detect the poor crimping of the connector, solve the problem of connector application reliability caused by incomplete crimping of the connector, and have important practicability in the quality control of connector crimping.

It is worth noting that the above characteristic parameters may include at least one of the following: the absolute distance of the connector pin sliding in the PCB hole; the absolute distance of the connector pin sliding in the PCB hole after the maximum deformation; the corresponding crimping force of the connector pin at the maximum deformation; the corresponding maximum crimping force of the connector during the crimping process.

In addition, as shown in FIG. 5, FIG. 5 is a flow chart of obtaining a crimping curve in a method for detecting a crimping state of a connector provided by an embodiment of the present application; after the above step S100, the above step S200 specifically includes, but is not limited to, steps S410 and S420.

Step S410, generating a crimping curve according to the displacement parameter and the crimping force parameter, wherein the crimping curve is a distribution curve in which the crimping force parameter changes with the displacement parameter;

Step S420, performing feature extraction processing based on the crimping curve to obtain feature parameters.

Specifically, during the process of crimping the connector to the PCB hole by the crimping head of the crimping device, the controller will obtain the distribution curve of the crimping force parameter changing with the displacement parameter during the crimping process of the connector, that is, the crimping curve, and then perform feature extraction processing based on the crimping curve to obtain the characteristic parameters.

In addition, as shown in FIG. 6 , FIG. 6 is a flow chart of performing feature extraction processing on the crimping curve to obtain characteristic parameters in the method for detecting the crimping state of a connector provided by an embodiment of the present application; regarding the feature extraction processing of the displacement parameters and crimping force parameters in the above step S200 to obtain the characteristic parameters, it specifically includes but is not limited to step S500.

Step S500, performing feature extraction processing on the crimping curve to obtain feature parameters.

Specifically, after the crimping curve is obtained, the controller performs feature extraction processing on the crimping curve to obtain feature parameters.

In addition, as shown in FIG. 7, FIG. 7 is a flow chart of judging the crimping state of the connector in the method for detecting the crimping state of the connector provided by an embodiment of the present application; when the characteristic parameters include the absolute distance of the pin of the connector sliding in the PCB hole; regarding the comparison of the characteristic parameters and the preset characteristic parameters in the above step S300, the crimping state of the connector is determined according to the comparison result, which specifically includes but is not limited to step S600.

Step S600 , when the absolute distance that the pins of the connector slide in the PCB hole is less than the first preset distance, determine that the crimping state of the connector is incomplete crimping.

Specifically, when the crimping head of the crimping device crimps the connector to the PCB hole, the controller will obtain the displacement parameters and crimping force parameters during the crimping process of the connector. Then, the controller will perform feature extraction processing on the displacement parameters and crimping force parameters to obtain the absolute distance of the connector pin sliding in the PCB hole; finally, the controller will compare the absolute distance of the connector pin sliding in the PCB hole with the first preset distance. If the absolute distance of the connector pin sliding in the PCB hole is smaller than the first preset distance, then the controller will determine the connection The crimping status of the device is incomplete crimping.

In addition, as shown in FIG. 8 , FIG. 8 is a flow chart of judging the crimping state of the connector in the method for detecting the crimping state of the connector provided by another embodiment of the present application; when the characteristic parameters include the absolute distance that the pin of the connector slides in the PCB hole after the maximum deformation and the corresponding crimping force when the pin of the connector is at the maximum deformation; with regard to the comparison of the characteristic parameters and preset characteristic parameters in the above step S300, the crimping state of the connector is determined according to the comparison result, specifically including but not limited to step S700.

Step S700, when the absolute distance that the pins of the connector slide in the PCB hole after the maximum deformation is less than the second preset distance, and the crimping force corresponding to the pins of the connector when the maximum deformation is less than the first preset crimping force, determine that the crimping state of the connector is the crimping kneeling pin.

Specifically, in the process of crimping the connector to the PCB hole by the crimping head of the crimping equipment, the controller will obtain the displacement parameters and crimping force parameters during the crimping process of the connector. Then, the controller will perform feature extraction processing on the displacement parameters and crimping force parameters to obtain the absolute distance of the connector pin sliding in the PCB hole after the maximum deformation and the corresponding crimping force of the connector pin at the maximum deformation; finally, the controller will compare the absolute distance of the connector pin sliding in the PCB hole after the maximum deformation with the second preset distance, and comparing the corresponding crimping force and the first preset crimping force of the pins of the connector at the maximum deformation, if the absolute distance of the pins of the connector sliding in the PCB hole after the maximum deformation is less than the second preset distance, and the crimping force corresponding to the pins of the connector at the maximum deformation is less than the first preset crimping force, then the controller will determine that the crimping state of the connector is a crimping pin.

In addition, as shown in FIG. 9, FIG. 9 is a flow chart of judging the crimping state of the connector in the detection method of the crimping state of the connector provided by another embodiment of the present application; when the characteristic parameters include the absolute distance that the pin of the connector slides in the PCB hole after the maximum deformation and the crimping force corresponding to the pin of the connector at the maximum deformation; with regard to the comparison of the characteristic parameters and preset characteristic parameters in the above step S300, the crimping state of the connector is determined according to the comparison result, specifically including but not limited to step S800.

Step S800, when the absolute distance of the pins of the connector sliding in the PCB hole after the maximum deformation is greater than or equal to the second preset distance, and the crimping force corresponding to the pins of the connector when the maximum deformation is less than the first preset crimping force, determine that the crimping state of the connector is that the size of the pins of the connector does not match the aperture of the PCB.

Specifically, in the process of crimping the connector to the PCB hole by the crimping head of the crimping equipment, the controller will obtain the displacement parameters and crimping force parameters during the crimping process of the connector. Then, the controller will perform feature extraction processing on the displacement parameters and crimping force parameters to obtain the absolute distance of the connector pin sliding in the PCB hole after the maximum deformation and the corresponding crimping force of the connector pin at the maximum deformation; finally, the controller will compare the absolute distance of the connector pin sliding in the PCB hole after the maximum deformation with the second preset distance, and comparing the corresponding crimping force and the first preset crimping force of the pins of the connector at the maximum deformation, if the absolute distance of the pins of the connector sliding in the PCB hole after the maximum deformation is greater than or equal to the second preset distance, and the crimping force corresponding to the pins of the connector at the maximum deformation is less than the first preset crimping force, then the controller will determine that the crimping state of the connector is that the size of the pins of the connector does not match the aperture of the PCB.

In addition, as shown in FIG. 10, FIG. 10 is a flow chart of judging the crimping state of the connector in the method for detecting the crimping state of the connector provided by another embodiment of the present application; when the characteristic parameters include the corresponding maximum crimping force of the connector during the crimping process; regarding the comparison of the characteristic parameters and the preset characteristic parameters in the above step S300, the crimping state of the connector is determined according to the comparison result, specifically including but not limited to step S900.

Step S900, when the corresponding maximum crimping force of the connector during the crimping process is greater than the second preset crimping force, determine that the crimping state of the connector is an over-pressed state.

Specifically, when the crimping head of the crimping device crimps the connector to the PCB hole, the controller will obtain the displacement parameter and the crimping force parameter during the crimping process of the connector. Then, the controller will perform feature extraction processing on the displacement parameter and the crimping force parameter to obtain the corresponding maximum crimping force of the connector during the crimping process; finally, the controller will compare the corresponding maximum crimping force of the connector during the crimping process with the second preset crimping force. If the corresponding maximum crimping force of the connector during the crimping process is greater than the second preset crimping force, then the controller will determine The crimp state of the connector is an overpressure state.

In addition, as shown in FIG. 11 , FIG. 11 is a flow chart of obtaining preset characteristic parameters in the detection method of the connector crimping state provided by an embodiment of the present application; before the above step S100, the embodiment of the present application also includes but is not limited to step S1010, step S1020 and step S1030.

Step S1010, obtaining batch sample displacement parameters and sample crimping force parameters of the connectors in the crimping normal state;

Step S1020, performing feature extraction processing on the sample displacement parameters and the sample crimping force parameters to obtain batches of sample feature parameters;

Step S1030, obtaining preset characteristic parameters according to the batch sample characteristic parameter analysis.

Specifically, in the embodiment of the present application, the preset characteristic parameters of the connector can be obtained through big data analysis of a large number of standard crimping curve characteristic parameters, such as statistical analysis models such as 3σ normal distribution.

In addition, as shown in FIG. 12, FIG. 12 is a flow chart of correcting the preset characteristic parameters in the detection method of the connector crimping state provided by an embodiment of the present application; after comparing the characteristic parameters and the preset characteristic parameters in the above step S300, and determining the crimping state of the connector according to the comparison result, the detection method of the embodiment of the present application also includes but is not limited to step S1100.

Step S1100, using the characteristic parameters to modify the preset characteristic parameters to obtain the corrected preset characteristic parameters.

Specifically, the embodiment of the present application can continuously modify and converge preset characteristic parameters, so as to further improve the accuracy of system judgment.

Based on the detection method of the crimping state of the connector in Fig. 4 to Fig. 12 above, the general embodiment of the present application is proposed below, which may specifically include the following four steps:

Step 1: Use the pressure sensor and the distance sensor of the crimping equipment to obtain the distribution curve of the pressure changing with the distance during the crimping process of the connector, that is, the crimping curve.

Step 2: Design connector crimping DOE (Design Of Experiment, Design of Experiments) tests according to different types of crimping failures, analyze the difference between crimping good products, crimping bad products and their corresponding crimping curves, and obtain the connector crimping curve characteristic parameters h ₀ , h ₁ , f ₁ , f ₂ , as shown in Figure 13. h ₀ is the absolute distance that the connector pin slides in the PCB hole, which can effectively indicate whether the crimping is complete. The size of h ₀ should be close to the size of the pin protruding from the PCB surface during pre-insertion (as shown in Figure 14). According to this principle, the starting position P ₁ of h ₀ is confirmed, and the effects of PCB warpage, PCB thickness tolerance, crimping mold tolerance, and crimping equipment mechanical coupling during the crimping process are eliminated as much as possible; the ending position P ₂ is the crimping stop position. Both the connector and the PCB have dimensional tolerances, so the starting position can fluctuate slightly from side to side. h ₁ is the absolute distance that the connector pin slides in the PCB hole after the maximum deformation, the starting position P ₃ is the peak position of the curve, and the end position P ₄ is the valley position of the curve. h ₁ decreases, indicating that the connector may be raised; f ₁ is the crimping force at the maximum deformation of the connector pin, that is, the crimping force at the peak of the curve. The decrease of f ₁ indicates that the number of pins at the maximum deformation of the pins may be reduced or the PCB aperture/pin size is abnormal. Combining h ₁ and f ₁ can effectively characterize whether the connector pins are kneeling. f ₂ is the maximum crimping force during the crimping process, which can effectively indicate whether the connector is over-pressed.

Step 3: Through big data analysis of a large number of standard crimping curve characteristic parameters h ₀ , h ₁ , f ₁ , f ₂ , such as statistical analysis models such as 3σ normal distribution, obtain connector crimping quality control thresholds H ₀ , H ₁ , F ₁ , F ₂ , which are the above-mentioned preset characteristic parameters.

Step 4: Calculate and compare whether the characteristic parameters of the crimping curve meet the threshold after the connector crimping is completed, and determine whether the quality of the connector crimping is good.

If h ₀ <H ₀ , it is judged that "crimping is not complete";

If h ₁ <H ₁ and f ₁ <F ₁ , it is judged as "crimping kneeling needle";

If h ₁ ≥ H ₁ and f ₁ < F ₁ , it is determined that "PCB aperture/connector pin size is abnormal";

If f ₂ >F ₂ , then determine "connector overvoltage";

If the characteristic parameter data is missing, it is judged as "connector leakage pressure".

In some examples, for the acquisition and verification of the threshold value of connector crimping quality control, that is, the preset characteristic parameters, as shown in Table 1 below, taking the fault type "incomplete crimping" as an example, the process of extracting crimping curve characteristic parameters from DOE tests is as follows: First, select appropriate influencing factors according to product characteristics, equipment characteristics, and fault principles, and use different influencing factors as gradient variables. Secondly, analyze the curve difference between complete crimping and incomplete crimping in the DOE test, and decompose the curve to obtain the characteristic parameter h ₀ of incomplete crimping. Finally, the complete crimping h ₀ in the DOE test is extracted in batches, and the threshold H ₀ is obtained through statistical analysis of data, such as 3σ normal distribution. Use H ₀ to judge the incomplete crimping curve in the test and verify its effectiveness.

Table 1

Based on the above detection method for the crimping state of the connector, a detection system for the crimping state of the connector supporting the detection method of the present application is proposed below.

As shown in FIG. 15 and FIG. 16 , FIG. 15 is a schematic structural diagram of a connector crimping state detection system provided by an embodiment of the present application, and FIG. 16 is a data block diagram of a connector crimping state detection system provided by an embodiment of the present application. The system consists of a scanning device 10 , a crimping device 20 , a data analysis system 30 and a defect control system 40 .

Specifically, the crimping equipment 20 can be a common servo-driven crimping machine or any other type of crimping machine, which can control the speed, displacement and applied force of the indenter 21 in the vertical direction with a certain program; the pressure sensor 22 is used to detect the crimping force during the crimping process, and can realize crimping curve feedback.

In addition, about the data analysis system 30, including data collection module 31, the deployment data of the header position and the corresponding pressure force data during the collection process, and the pressure connection curve of the displacement-pressure connection force; parameter analysis module 32, the built-in pressure connection curve feature parameter extraction algorithm, quickly calculate the feature parameters of the output pressure connecting curve; verify the transfer module 33, the feature parameters are compared with the threshold, and the system judges the system judgment. Determine whether the pressure connection is poor; the threshold self -learning module 34, read the batch pressure connection standard curve, calculate the initial threshold of the feature parameter, and learn the maintenance data. The data analysis system can be connected with any number of crimping devices 20 that meet the functions. It should be noted that the data analysis system 30 in the embodiment of the present application may include the above-mentioned controller.

In addition, regarding the defect control system 40, it includes the NG buffer area 41, where the system determines that products with abnormal crimping quality will be alerted and intercepted; the maintenance input area 42 is used to input the actual maintenance results of the crimping process; the data query area 43 supports all crimping process data queries such as time, program, and curve.

Based on the detection system of the above-mentioned connector crimping state, its specific implementation and operation method may include the following nine steps:

Step 1. The product enters the crimping process through the scanning device 10, and scans to obtain product information, including product barcode, name, and crimping program (the crimping program includes settings such as crimping device, crimping position, speed and pressure).

Step 2: The crimping device 20 controls the indenter 21 to complete one connector crimping according to the crimping procedure. The pressure sensor 22 detects the crimping force in the process in real time, and the equipment records the crimping data in real time.

Step 3: The data acquisition module 31 collects the crimping data recorded by the crimping equipment, and generates a displacement-crimping force curve; at the same time, it reads crimping product information, including product name, barcode, crimping device, crimping position, etc., to ensure that the crimping curve corresponds to the crimping process one by one.

Step 4: The characteristic parameter analysis module 32 reads the collected crimping data in real time, and calculates the characteristic parameters h ₀ , h ₁ , f ₁ , f ₂ of the crimping curve after each crimping is completed.

Step 5: The parameter verification transfer module 33 reads the result of the parameter analysis module 32 and compares it with the standard thresholds H ₀ , H ₁ , F ₁ , and F ₂ . If h ₀ <H ₀ , judge "incomplete crimping"; if h ₁ <H ₁ and f ₁ <F ₁ , judge "crimping kneeling pin"; if h ₁ ≥ H ₁ and f ₁ <F ₁ , judge "abnormal PCB aperture/connector pin size"; if f ₂ >F ₂ , judge "connector overvoltage";

Step 6: The system judges that the abnormal crimping data enters the NG buffer area 41, performs an alarm and locks, and prohibits entering the next process. The alarm is specific to the product barcode and the specific location of the fault.

Step 7. In addition, the standard thresholds H ₀ , H ₁ , F ₁ , and F ₂ are derived from the threshold self-learning module 34 . This module reads batch crimping standard curves to obtain a large number of normal crimping h ₀ , h ₁ , f ₁ , f ₂ , and obtains thresholds H ₀ , H ₁ , F ₁ , and F ₂ through 3σ normal distribution or other quality analysis models.

Step 8. The self-learning function of the threshold self-learning module 34 collects the maintenance data of the crimping process by reading the interface of the maintenance entry area 42, and continuously corrects and converges the standard thresholds H ₀ , H ₁ , F ₁ , and F ₂ to further improve the accuracy of system judgment.

Step 9: The data query area 43 is used as a query application, including information such as the corresponding crimping procedure, crimping time, and crimping curve during product crimping, and supports daily crimping process optimization or product failure analysis.

It is worth noting that the crimping equipment in the embodiment of the present application is not limited to the driving method, and the pressure sensor can be other devices with the same function, as long as it can support real-time and accurate feedback of the crimping force and the displacement of the indenter.

In addition, the characteristic parameters of the crimping curve may be other effective parameters that can characterize the quality of the crimping process, such as the slope of the curve. The functions of data acquisition, analysis, handover and learning modules can be freely combined or split without affecting the system operation.

The detection system for the crimping state of the connector described in this application judges the crimping quality by extracting the characteristic parameters of the crimping curve and doing big data analysis. Each set of crimping curves corresponds to the crimping process, and the abnormal alarm is specific to the product barcode and crimping position.

Based on the above-mentioned connector crimping state detection method and connector crimping state detection system, a specific embodiment of this application for intercepting a certain high-speed connector crimping failure through crimping curves is proposed below.

In some examples, the following steps may be included but not limited to intercepting a high-speed connector that is not crimped in place through the crimping curve:

(1) According to the A-code high-speed connector pin size and PCB aperture design, the dimension L (as shown in Figure 14) of the connector pin protruding from the board surface when calculating the pre-insertion is about 0.6mm. The specific value of L is different for different connector pin designs and PCB aperture designs.

(2) Take a connector crimping standard curve, P ₂ is the position where the curve ends, P ₁ -P ₂ = L to calculate the position of P ₁ , and obtain the crimping force at P ₁ as 100lbf. The connector pin design is different, the PCB aperture design is different, the crimping process is different, and the crimping force at P ₁ is different. P ₁ and P ₂ are shown in Figure 17 below.

(3) Take the normal batch crimping curves of connectors (for example, 100 pieces), take the first crimping force greater than or equal to 100lbs as the starting point P ₁ , and the crimping end position is P ₂ , calculate h ₀ =P ₁ -P ₂ , and obtain the batch h ₀ . The number of specific curves can be adjusted according to the actual situation.

(4) Make 3σ normal distribution statistics on the obtained batch h ₀ , obtain the A-code connector threshold H ₀ , and input it into this system as the criterion for judging whether the crimping is in place. _H0 can also be obtained using any other suitable mathematical statistical model or practical empirical model.

(5) It is assumed that the high-speed connector is used in the product during factory processing. Before crimping, scan the product barcode X to obtain the product information, including the code A of the crimping connector and its position on the PCB, and match the code to the threshold H ₀ .

(6) After the crimping is completed, the parameter analysis module reads the crimping curves of all connectors of the product. The crimping curve of the A-code connector is extracted according to the rules described in step (3), and P ₁ and P ₂ are calculated to obtain the corresponding h ₀ =P ₁ -P ₂ .

(7) Take all A-code connectors h ₀ on the product and compare it with the standard threshold H ₀ . If h ₀ <H ₀ at the Y position, it is determined that the crimping at this position is incomplete, and an alarm and interception are performed on the product. If h ₀ ≥ _{H 0} , it is determined that the crimping is complete and no alarm is given. As shown in Figure 18 below, it is a schematic diagram of the comparison of incomplete curves of connector crimping.

(8) Alarm description: The crimping of the A device at the Y position of the X barcode is not complete.

Based on the technical solutions of the embodiments of the present application, the following technical effects can be obtained:

1. Low cost and high efficiency: In some examples, the price of the backplane ICT test fixture is 6-8W, and the average test time for a single board is 2-10 minutes. Each product needs to develop a fixture separately, and the development period is 2-3 months; the price of 3D X-RAY equipment is between 200-800W, and the average test time for a single board is 2-10 minutes. However, based on the existing crimping equipment that supports curve feedback, this application requires less hardware equipment (only small equipment such as scanning guns and office computers), and the input cost is low. Scan the system after the crimping is completed, and the bad feedback time does not exceed 1 minute.

2. Fill in the loopholes in connector testing: for pressure leakage and incomplete crimping, manual visual inspection is difficult to control, and ICT, including the whole machine test, cannot be effectively intercepted. This application can effectively intercept and completely solve the field reliability problems caused by leakage or incomplete crimping.

Based on the above method for detecting the crimping state of the connector, various embodiments of the controller, the system for detecting the crimping state of the connector and the computer-readable storage medium of the present application are proposed below.

In addition, an embodiment of the present application provides a controller, the controller includes: a memory, a processor, and a computer program stored in the memory and operable on the processor, and the processor implements the above detection method when executing the computer program.

It can be understood that the processor and the memory can be connected through a bus or in other ways.

It should be noted that the controller in this embodiment may include the processor and the memory shown in FIG. 3 , both of which belong to the same inventive concept, so they have the same implementation principle and beneficial effect, and will not be described in detail here.

The non-transitory software programs and instructions required to implement the detection method of the above-mentioned embodiment are stored in the memory, and when executed by the processor, the detection method of the connector crimping state of the above-mentioned embodiment is executed, for example, the method steps in Fig. 4 to Fig. 12 described above are executed.

It should be noted that, for the specific implementation manner and technical effect of the controller in the embodiment of the present application, reference may be made to the specific implementation manner and technical effect of the method for detecting the crimping state of the connector described above.

In addition, an embodiment of the present application provides a connector crimping state detection system, the connector crimping state detection system includes but not limited to crimping equipment and the above-mentioned controller, the controller communicates with the crimping equipment.

It is worth noting that since the detection system of the connector crimping state in the embodiment of the present application includes the above-mentioned controller, and the above-mentioned controller can execute the above-mentioned detection method of the connector crimping state, therefore, the specific implementation manner and technical effect of the detection system of the connector crimping state in the embodiment of the present application can correspond to the specific implementation manner and technical effect of the above-mentioned connector crimping state detection method.

In addition, an embodiment of the present application also provides a computer-readable storage medium, the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are used to perform the above-mentioned method for detecting the connector crimping state, for example, perform the method steps in FIGS. 4 to 12 described above.

The embodiment of the present application includes: firstly, obtaining the displacement parameter and the crimping force parameter of the crimping head of the crimping device during crimping the connector; then, performing feature extraction processing on the displacement parameter and the crimping force parameter to obtain the feature parameter; finally, comparing the feature parameter with a preset feature parameter, and determining the crimping state of the connector according to the comparison result. According to the technical solution of the embodiment of the present application, the embodiment of the present application only needs to extract the characteristic parameters according to the displacement parameters and the crimping force parameters, and compare the characteristic parameters with the preset characteristic parameters to obtain the crimping state of the connector. Compared with the existing detection means, it can quickly and accurately detect the poor crimping of the connector, solve the problem of connector application reliability caused by incomplete crimping of the connector, and has important practicability in the quality control of connector crimping.

Those skilled in the art can understand that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware and an appropriate combination thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As is well known to those of ordinary skill in the art, the term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cartridges, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and that can be accessed by a computer. In addition, communication media typically embody computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media, as are known to those of ordinary skill in the art.

The above is a specific description of some implementations of the present application, but the application is not limited to the above-mentioned embodiments. Those skilled in the art can also make various equivalent deformations or replacements without violating the sharing conditions of the scope of the application. These equivalent deformations or replacements are all included in the scope defined by the claims of the application.

Claims

A method for detecting a crimping state of a connector, applied to a controller in a detection system, the detection system further comprising crimping equipment, the controller communicating with the crimping equipment, the detection method comprising:

Obtaining displacement parameters and crimping force parameters of the crimping head of the crimping device during crimping the connector;

performing feature extraction processing on the displacement parameter and the crimping force parameter to obtain feature parameters;

The characteristic parameter is compared with the preset characteristic parameter, and the crimping state of the connector is determined according to the comparison result.
The detection method according to claim 1, wherein the method further comprises:

After obtaining the displacement parameter and the crimping force parameter of the crimping head of the crimping device during crimping the connector, generate a crimping curve according to the displacement parameter and the crimping force parameter, wherein the crimping curve is a distribution curve of the crimping force parameter changing with the displacement parameter;

Performing feature extraction processing on the displacement parameter and the crimping force parameter to obtain the feature parameters includes: performing feature extraction processing based on the crimping curve to obtain the feature parameters.
The detection method according to claim 2, wherein said performing feature extraction processing on said displacement parameter and said crimping force parameter to obtain feature parameters includes:

Perform feature extraction processing on the crimping curve to obtain the feature parameters.
The detection method according to claim 1, wherein the characteristic parameters include at least one of the following:

The absolute distance that the pin of the connector slides in the PCB hole;

The absolute distance that the pin of the connector slides in the PCB hole after completing the maximum deformation;

The crimping force corresponding to the pin of the connector at the time of maximum deformation;

The maximum crimping force corresponding to the connector during the crimping process.
The detection method according to claim 4, wherein, when the characteristic parameter includes the absolute distance that the pin of the connector slides in the PCB hole; the comparison of the characteristic parameter and the preset characteristic parameter, and determining the crimping state of the connector according to the comparison result include:

When the absolute distance that the pins of the connector slide in the PCB hole is less than the first preset distance, it is determined that the crimping state of the connector is incomplete crimping.
The detection method according to claim 4, wherein when the characteristic parameters include the absolute distance that the pins of the connector slide in the PCB hole after the maximum deformation and the crimping force corresponding to the pins of the connector at the maximum deformation; the comparison of the characteristic parameters and the preset characteristic parameters, and determining the crimping state of the connector according to the comparison results include one of the following:

When the absolute distance of the pins of the connector sliding in the PCB hole after the maximum deformation is less than the second preset distance, and the corresponding crimping force of the pins of the connector is less than the first preset crimping force when the pins are deformed at the maximum, it is determined that the crimping state of the connector is a crimping kneeling pin;

When the absolute distance of the pins of the connector sliding in the PCB hole after the maximum deformation is greater than or equal to the second preset distance, and the crimping force corresponding to the pins of the connector when the maximum deformation is less than the first preset crimping force, it is determined that the crimping state of the connector is that the size of the pins of the connector does not match the aperture of the PCB.
The detection method according to claim 4, wherein, when the characteristic parameters include the corresponding maximum crimping force of the connector during the crimping process; comparing the characteristic parameters with preset characteristic parameters, and determining the crimping state of the connector according to the comparison result, include:

When the corresponding maximum crimping force of the connector in the crimping process is greater than the second preset crimping force, it is determined that the crimping state of the connector is an over-pressed state.
The detection method according to claim 1, wherein, before acquiring the displacement parameters and crimping force parameters of the indenter of the crimping device during crimping the connector, the method further comprises:

Obtaining batch sample displacement parameters and sample crimping force parameters of the connectors in a normal state of crimping;

performing feature extraction processing on the sample displacement parameter and the sample crimping force parameter to obtain batch sample feature parameters;

The preset characteristic parameters are obtained according to the batch analysis of the sample characteristic parameters.
The detection method according to claim 1, wherein, after comparing the characteristic parameters with preset characteristic parameters and determining the crimping state of the connector according to the comparison result, the detection method further comprises:

The preset characteristic parameters are corrected by using the characteristic parameters to obtain the corrected preset characteristic parameters.
A controller, comprising a memory, a processor, and a computer program stored on the memory and operable on the processor, wherein the detection method according to any one of claims 1 to 9 is realized when the processor executes the computer program.
A detection system for a crimping state of a connector, comprising a crimping device and a controller according to claim 10, wherein the controller communicates with the crimping device.
A computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the detection method according to any one of claims 1-9.