A method, system, and apparatus for precision control of press-fit depth, and a storage medium

Abstract

The application discloses a kind of accurate control methods of press fitting depth, belong to the technical field of parts press fitting, including obtaining press displacement data;According to the press displacement data, real-time pressure data corresponding to the press displacement data is called;From the preset database, the preset standard press fitting pressure corresponding to the real-time pressure data is inquired;According to the difference between the real-time pressure data and the preset standard press fitting pressure, pressure deviation data F is generated;From the preset database, the preset pressure gain P corresponding to the pressure deviation data F is inquired;Press fitting coefficient Cal is calculated and generated;From the preset database, target set value T and compensation set value offset are inquired;According to the target set value T, compensation set value offset and the press fitting coefficient Cal, target displacement value S is calculated and generated;Press fitting depth control instruction is generated and executed.The application has the effect of realizing accurate control press fitting depth.

Description

Technical Field

[0001] This invention relates to the technical field of component pressing, and in particular to a method, system, device, and storage medium for precise control of pressing depth. Background Technology

[0002] Press fitting typically refers to the method of assembling two interference-fit parts into a designated position within a hole by applying pressure. This method is widely used in mechanical assembly processes, especially in interference-fit assembly. For example, the installation of parts such as the cup-shaped plug used for sealing in engine cylinder heads, engine valve guides, engine valve seats, and gearbox bearings all employ press fitting. When assembling the air circuit control valve body of a dual-fuel injector, the press fitting accuracy between the armature and the valve body needs to be controlled within 10µm.

[0003] Hydraulic cylinders or servo cylinders are generally used for press fitting operations. The press fitting process is usually as follows: (1) The workpiece to be pressed is loaded into the press fitting machine and positioned using locating pins and locating surfaces; (2) The workpiece is clamped; (3) The press head tooling picks up the material and positions it; (4) The shaft part is pressed into the position specified by the servo press head, and the press head retracts; (5) The clamping is released and the material is unloaded. In the above operation process, it is necessary to accurately control the pressing depth of the shaft part into the hole part to ensure the quality of the overall part. The pressing depth of the shaft part refers to the distance between the inner end face of the shaft part and the reference surface of the press-in hole opened on the hole part after press fitting.

[0004] The press-fitting methods described above can only control the press-fitting depth by controlling the operating position of the press head, that is, by controlling the distance between the press head and the reference surface of the hole-type part. Since the press-fitting accuracy requirements between the air circuit control valve body and the armature of the dual-fuel injector are high, during the press-fitting process, due to the individual differences between the parts, the force deviation generated during the interference fit is large. Therefore, during the press-fitting process, the valve body and the armature will deform to different degrees. As a result, when the press head presses down at a fixed distance, the final press-in depth of the shaft-type parts will be different, resulting in different press-fitting depths in different parts, and there may be cases where the quality of the parts does not meet the standards. Summary of the Invention

[0005] This invention provides a method, system, device, and storage medium for precise control of pressing depth. By collecting the specific pressure during the pressing process, the pressing target value is adjusted to eliminate the influence of deformation, thereby achieving the purpose of precise control of pressing depth.

[0006] The present invention provides a method, system, device, and storage medium for precise control of pressing depth, which adopts the following technical solution:

[0007] In a first aspect, the present invention provides a method for precisely controlling the pressing depth, comprising the following steps:

[0008] Monitor press displacement data;

[0009] Based on the press displacement data, retrieve the real-time pressure data corresponding to the press displacement data;

[0010] Retrieve the preset standard press pressure corresponding to the real-time pressure data from the preset database;

[0011] Based on the difference between the real-time pressure data and the preset standard press-fitting pressure, pressure deviation data F is generated;

[0012] Retrieve the preset pressure gain P corresponding to the pressure deviation data F from the preset database;

[0013] If the real-time pressure data is greater than or equal to the preset standard pressing pressure, then the pressing coefficient Cal is calculated based on the pressure deviation data F and the preset pressure gain P, where Cal = 1 + F × P;

[0014] If the real-time pressure data is less than the preset standard pressing pressure, then the pressing coefficient Cal is calculated based on the pressure deviation data F and the preset pressure gain P, where Cal = 1 - F × P;

[0015] Retrieve the target setting value T and the compensation setting value offset from the preset database;

[0016] Based on the target setpoint T, the compensation setpoint offset, and the pressing coefficient Cal, the target displacement value S is calculated and generated, where S = T × Cal + offset;

[0017] Based on the target displacement value S, a pressing depth control command is generated and executed.

[0018] By adopting the above technical solution, during the press-fitting operation, the armature is first placed below the valve body, and both are placed on the support of the press. The press head first performs a pre-press-fitting operation on the valve body and armature. At this time, the press-fitting control system acquires the displacement data of the press head and retrieves the real-time pressure data corresponding to the press displacement data. Then, it calculates the difference between the real-time pressure data and the preset standard press-fitting pressure, and then queries the preset pressure gain P corresponding to the pressure deviation data F from the preset database. Based on the relationship between the real-time pressure data and the preset standard press-fitting pressure, the press-fitting coefficient Cal is calculated accordingly. The target set value T and the compensation set value offset are queried from the preset database. Based on the target set value T, the compensation set value offset, and the press-fitting coefficient Cal, the target displacement value S is calculated and generated. Finally, based on the target displacement value S, a press-fitting depth control command is generated and executed, so that the press head performs a second press-fitting operation on the valve body and armature according to the target displacement value S.

[0019] Furthermore, the step of querying the preset pressure gain P corresponding to the pressure deviation data F from the preset database specifically includes:

[0020] Responding to a user's press data acquisition request sent via a smart terminal, the press data acquisition request carries press data acquisition information for acquiring historical press information, the historical press information including historical actual press depth value and historical maximum pressure during the press process;

[0021] Based on the historical actual pressing depth value and the historical maximum pressure during the pressing process, a pressure displacement confidence interval is generated. The pressure displacement confidence interval is used to reflect the correlation between the historical actual pressing depth value and the historical maximum pressure during the pressing process.

[0022] Based on the pressure displacement confidence interval, a corresponding function for the press fitting parameters is calculated and generated. This function reflects the correspondence between the pressure deviation data F and the preset pressure gain P.

[0023] Secondly, the present invention provides a precise control system for pressing depth, comprising:

[0024] The press displacement data acquisition module is used to acquire press displacement data;

[0025] The real-time pressure data retrieval module is used to retrieve real-time pressure data corresponding to the press displacement data based on the press displacement data.

[0026] The preset standard press-fitting pressure query module is used to query the preset standard press-fitting pressure corresponding to the real-time pressure data from a preset database;

[0027] The pressure deviation data F generation module is used to generate pressure deviation data F based on the difference between the real-time pressure data and the preset standard press-fitting pressure.

[0028] The preset pressure gain P query module is used to query the preset pressure gain P corresponding to the pressure deviation data F from the preset database;

[0029] The first press-fit coefficient generation module is used to calculate and generate a press-fit coefficient Cal based on the pressure deviation data F and the preset pressure gain P if the real-time pressure data is greater than or equal to the preset standard press-fit pressure, where Cal = 1 + F × P.

[0030] The second press-fit coefficient generation module is used to calculate and generate a press-fit coefficient Cal based on the pressure deviation data F and the preset pressure gain P if the real-time pressure data is less than the preset standard press-fit pressure, where Cal = 1 - F × P.

[0031] The compensation setting value query module is used to query the target setting value T and the compensation setting value offset from a preset database;

[0032] The target displacement value calculation module is used to calculate and generate the target displacement value S based on the target set value T, the compensation set value offset and the pressing coefficient Cal, where S = T × Cal + offset;

[0033] The pressing depth control command generation module is used to generate and execute pressing depth control commands based on the target displacement value S.

[0034] Thirdly, the present invention provides a smart terminal, including a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and executed the above-mentioned method for precise control of pressing depth.

[0035] Fourthly, the present invention provides a computer-readable storage medium storing a computer program that can be loaded by a processor and executed as described above for a precise control method of pressing depth.

[0036] In summary, compared with the prior art, the beneficial effects of the above technical solution are:

[0037] The present invention discloses a method, system, device, and storage medium for precise control of pressing depth. By pre-analyzing the deformation that may occur in the valve body and armature during the pressing process, the corresponding relationship between the pressing depth value and the maximum pressure value during a single pressing process is obtained, so as to know the relative relationship between pressure and displacement. Then, compensation calculations are performed on the actual historical sample data to obtain the gain coefficient. During the press-fitting operation, the armature is first placed below the valve body, and both are placed on the press support. The press head first performs a pre-press-fitting operation on the valve body and armature. At this time, the press-fitting control system acquires the displacement data of the press head and retrieves the real-time pressure data corresponding to the press displacement data. Then, it calculates the difference between the real-time pressure data and the preset standard press-fitting pressure, and then queries the preset pressure gain P corresponding to the pressure deviation data F from the preset database. Based on the relationship between the real-time pressure data and the preset standard press-fitting pressure, the press-fitting coefficient Cal is calculated. The target set value T and the compensation set value offset are queried from the preset database. Based on the target set value T, the compensation set value offset, and the press-fitting coefficient Cal, the target displacement value S is calculated and generated. Finally, based on the target displacement value S, a press-fitting depth control command is generated and executed, so that the press head performs a second press-fitting operation on the valve body and armature according to the target displacement value S. This allows the press to adjust the press-fitting depth according to the actual deformation of each valve body and armature, thereby reducing the influence of pressure on the press-fitting result. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0039] Figure 2 This is a schematic diagram of the process of generating and executing pressing depth control instructions in an embodiment of the present invention.

[0040] Figure 3 This is a flowchart illustrating the process of calculating and generating the corresponding function for pressing parameters in an embodiment of the present invention.

[0041] Figure 4 This is a matrix diagram of pressure and displacement in an embodiment of the present invention.

[0042] Figure 5 This is a matrix diagram of confidence intervals in an embodiment of the present invention.

[0043] Figure 6 This is a block diagram of each module in an embodiment of the present invention.

[0044] Explanation of reference numerals in the attached diagram: 1. Press displacement data acquisition module; 2. Real-time pressure data retrieval module; 3. Preset standard pressing pressure query module; 4. Pressure deviation data F generation module; 5. Preset pressure gain P query module; 6. First pressing coefficient generation module; 7. Second pressing coefficient generation module; 8. Compensation setpoint query module; 9. Target displacement value calculation module; 10. Pressing depth control command generation module; 11. Press; 12. Pressure sensor; 13. Valve body; 14. Armature. Detailed Implementation

[0045] The present invention will be further described in detail below with reference to all the accompanying drawings.

[0046] This invention discloses a method, system, device, and storage medium for precise control of pressing depth, as described in the embodiments of the present invention. Figures 1-5 A method for precise control of pressing depth, comprising:

[0047] S101. Obtain press displacement data.

[0048] Specifically, the press head of the press is equipped with a displacement sensor. During the pressing operation, the operator first places the armature below the valve body and places both on the support of the press. The press head first performs a pre-pressing operation on the valve body and the armature. At this time, the displacement sensor generates a pressure sensing signal based on the actual displacement of the press head and sends it. The pressing control system obtains the displacement data of the press head.

[0049] S102. Retrieve the real-time pressure data corresponding to the press displacement data.

[0050] Specifically, a pressure sensor is installed on the support base of the press. During the press operation, the pressure sensor is located below the armature and is used to monitor the actual pressure on the valve body and the armature. After the press control system obtains the displacement data of the press head, it retrieves the real-time pressure data corresponding to the current press displacement data.

[0051] S103. Query the preset standard press pressure corresponding to the real-time pressure data from the preset database.

[0052] Specifically, after the press-fitting control system retrieves the real-time pressure data corresponding to the current press displacement data, it queries the preset standard press-fitting pressure corresponding to the real-time pressure data from the preset database. The preset standard press-fitting pressure is generated in advance by the user. For example, the user sets the preset standard press-fitting pressure to 1050 Nm.

[0053] S104. Generate pressure deviation data F.

[0054] Specifically, the press-fitting control system generates pressure deviation data F based on the difference between the real-time pressure data and the preset standard press-fitting pressure. The pressure deviation data F reflects the relationship between the current real-time pressure data and the preset standard press-fitting pressure.

[0055] S105. Query the preset pressure gain P corresponding to the pressure deviation data F from the preset database.

[0056] Specifically, the press-fitting control system queries a preset pressure gain P corresponding to the pressure deviation data F from a preset database. The preset pressure gain P is generated in advance by the user. For example, the user sets the preset pressure gain P to 0.0003.

[0057] S106. Calculate and generate the pressing coefficient Cal.

[0058] Specifically, if the real-time pressure data is greater than or equal to the preset standard pressing pressure, the pressing control system calculates and generates a pressing coefficient Cal based on the pressure deviation data F and the preset pressure gain P, where Cal = 1 + F × P. If the real-time pressure data is less than the preset standard pressing pressure, the pressing control system calculates and generates a pressing coefficient Cal based on the pressure deviation data F and the preset pressure gain P, where Cal = 1 - F × P.

[0059] S107. Query the target setting value T and the compensation setting value offset from the preset database.

[0060] Specifically, after the press-fitting control system calculates and generates the press-fitting coefficient Cal, it queries the target set value T and the compensation set value offset from the preset database. The compensation set value offset is generated in advance by the user. For example, the user sets the compensation set value offset to 0.002mm.

[0061] S108. Calculate and generate the target displacement value S.

[0062] Specifically, the press-fitting control system calculates and generates the target displacement value S based on the target setpoint T, the compensation setpoint offset, and the press-fitting coefficient Cal, where S = T × Cal + offset;

[0063] S109. Generate and execute the pressing depth control command.

[0064] Specifically, the press-fitting control system generates and executes a press-fitting depth control command based on the target displacement value S, so that the press head of the press performs a second press-fitting operation on the valve body and armature according to the target displacement value S.

[0065] In another embodiment, reference is made to Figure 2S105 specifically includes the following sub-steps:

[0066] S105.1 Respond to the user's request to obtain pressing data sent through the smart terminal.

[0067] Specifically, the press-fitting control system responds to a press-fitting data acquisition request sent by the user through a smart terminal. The press-fitting data acquisition request carries press-fitting data acquisition information for acquiring historical press-fitting information, which includes the historical actual press-fitting depth value and the historical maximum pressure during the press-fitting process.

[0068] Before the formal pressing operation, the pressing control system performs multiple pre-pressing drills. The press head of the press performs a pre-pressing operation on the valve body and armature with a constant displacement. In this embodiment of the invention, the pressing depth of the valve body and armature should meet the range of 0.045mm ± 0.005mm. The press head of the press performs a pre-pressing operation on the valve body and armature with a constant displacement of 5μm. After the pre-pressing operation is completed, the press head of the press separates from the valve body. At this time, the pressing depth of the valve body and armature may be around 5μm. Due to the uncontrollable deformation of the valve body and armature, the pressing depth of some valve bodies and armatures does not meet the range of 0.045mm ± 0.005mm. The pressing control system pre-analyzes the deformation that the valve body and armature may generate during the pressing process and obtains the correspondence between the pressing depth value and the maximum pressure value during the pressing process.

[0069] S105.2, Generate the pressure displacement confidence interval.

[0070] Specifically, the press-fitting control system generates a pressure displacement confidence interval based on the historical actual press-fitting depth value and the historical maximum pressure during the press-fitting process. The pressure displacement confidence interval is used to reflect the correlation between the historical actual press-fitting depth value and the historical maximum pressure during the press-fitting process.

[0071] S105.3 Calculate and generate the corresponding function for press fitting parameters.

[0072] Specifically, the press-fitting control system calculates and generates a press-fitting parameter correspondence function based on the pressure displacement confidence interval. The press-fitting parameter correspondence function is used to reflect the correspondence between the pressure deviation data F and the preset pressure gain P.

[0073] The implementation principle of the precise control method for pressing depth in this embodiment of the invention is as follows: by pre-analyzing the deformation that may occur between the valve body and the armature during the pressing process, the corresponding relationship between the pressing depth value and the maximum pressure value during the pressing process is obtained, so as to know the relative relationship between pressure and displacement. Then, the actual historical sample data is used for compensation calculation to obtain the gain coefficient. During the press-fitting operation, the armature is first placed below the valve body, and both are placed on the press support. The press head first performs a pre-press-fitting operation on the valve body and armature. At this time, the press-fitting control system acquires the displacement data of the press head and retrieves the real-time pressure data corresponding to the press displacement data. Then, it calculates the difference between the real-time pressure data and the preset standard press-fitting pressure, and then queries the preset pressure gain P corresponding to the pressure deviation data F from the preset database. Based on the relationship between the real-time pressure data and the preset standard press-fitting pressure, the press-fitting coefficient Cal is calculated. The target set value T and the compensation set value offset are queried from the preset database. Based on the target set value T, the compensation set value offset, and the press-fitting coefficient Cal, the target displacement value S is calculated and generated. Finally, based on the target displacement value S, a press-fitting depth control command is generated and executed, so that the press head performs a second press-fitting operation on the valve body and armature according to the target displacement value S. This allows the press to adjust the press-fitting depth according to the actual deformation of each valve body and armature, thereby reducing the influence of pressure on the press-fitting result.

[0074] Based on the above method, this invention also discloses a precise control system for pressing depth. (Refer to...) Figure 6 A precise control system for pressing depth includes:

[0075] Press displacement data acquisition module 1 is used to acquire press displacement data.

[0076] The real-time pressure data retrieval module 2 is used to retrieve real-time pressure data corresponding to the press displacement data based on the press displacement data.

[0077] The preset standard press-fitting pressure query module 3 is used to query the preset standard press-fitting pressure corresponding to the real-time pressure data from a preset database.

[0078] Pressure deviation data F generation module 4 is used to generate pressure deviation data F based on the difference between the real-time pressure data and the preset standard press-fitting pressure.

[0079] The preset pressure gain P query module 5 is used to query the preset pressure gain P corresponding to the pressure deviation data F from the preset database.

[0080] The first press-fit coefficient generation module 6 is used to calculate and generate a press-fit coefficient Cal based on the pressure deviation data F and the preset pressure gain P if the real-time pressure data is greater than or equal to the preset standard press-fit pressure, where Cal = 1 + F × P.

[0081] The second press-fit coefficient generation module 7 is used to calculate and generate a press-fit coefficient Cal based on the pressure deviation data F and the preset pressure gain P if the real-time pressure data is less than the preset standard press-fit pressure, where Cal = 1 - F × P.

[0082] The compensation setting value query module 8 is used to query the target setting value T and the compensation setting value offset from the preset database.

[0083] The target displacement value calculation module 9 is used to calculate and generate the target displacement value S based on the target set value T, the compensation set value offset and the pressing coefficient Cal, where S = T × Cal + offset.

[0084] The pressing depth control command generation module 10 is used to generate and execute pressing depth control commands based on the target displacement value S.

[0085] This invention also discloses a smart terminal, which includes a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and executed as described above for a precise control method of pressing depth.

[0086] This invention also discloses a computer-readable storage medium. The computer-readable storage medium stores a computer program that can be loaded by a processor and executed as described above for a precise control method of pressing depth. The computer-readable storage medium includes, for example, various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0087] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions also fall within the scope of protection of the present invention.

Claims

1. A method for precisely controlling the pressing depth, characterized in that, Includes the following steps: Monitor press displacement data; Based on the press displacement data, retrieve the real-time pressure data corresponding to the press displacement data; Retrieve the preset standard press pressure corresponding to the real-time pressure data from the preset database; Based on the difference between the real-time pressure data and the preset standard press-fitting pressure, pressure deviation data F is generated; Retrieve the preset pressure gain P corresponding to the pressure deviation data F from the preset database; If the real-time pressure data is greater than or equal to the preset standard pressing pressure, then the pressing coefficient Cal is calculated based on the pressure deviation data F and the preset pressure gain P, where Cal = 1 + F × P; If the real-time pressure data is less than the preset standard pressing pressure, then the pressing coefficient Cal is calculated based on the pressure deviation data F and the preset pressure gain P, where Cal = 1 - F × P; Retrieve the target setting value T and the compensation setting value offset from the preset database; Based on the target setpoint T, the compensation setpoint offset, and the pressing coefficient Cal, the target displacement value S is calculated and generated, where S = T × Cal + offset; Based on the target displacement value S, generate and execute the pressing depth control command; The step of querying the preset pressure gain P corresponding to the pressure deviation data F from the preset database specifically includes: In response to a user’s press data acquisition request sent via a smart terminal, the press data acquisition request carries press data acquisition information for acquiring historical press information, the historical press information including historical actual press depth value and historical maximum pressure during the press process; Based on the historical actual pressing depth value and the historical maximum pressure during the pressing process, a pressure displacement confidence interval is generated. The pressure displacement confidence interval is used to reflect the correlation between the historical actual pressing depth value and the historical maximum pressure during the pressing process. Based on the pressure displacement confidence interval, a corresponding function for the press fitting parameters is calculated and generated. This function reflects the correspondence between the pressure deviation data F and the preset pressure gain P.

2. A precise control system for pressing depth, characterized in that, include: The press displacement data acquisition module is used to acquire press displacement data; The real-time pressure data retrieval module is used to retrieve real-time pressure data corresponding to the press displacement data based on the press displacement data. The preset standard press-fitting pressure query module is used to query the preset standard press-fitting pressure corresponding to the real-time pressure data from a preset database; The pressure deviation data F generation module is used to generate pressure deviation data F based on the difference between the real-time pressure data and the preset standard press-fitting pressure. The preset pressure gain P query module is used to query the preset pressure gain P corresponding to the pressure deviation data F from the preset database; The first press-fit coefficient generation module is used to calculate and generate a press-fit coefficient Cal based on the pressure deviation data F and the preset pressure gain P if the real-time pressure data is greater than or equal to the preset standard press-fit pressure, where Cal = 1 + F × P. The second press-fit coefficient generation module is used to calculate and generate a press-fit coefficient Cal based on the pressure deviation data F and the preset pressure gain P if the real-time pressure data is less than the preset standard press-fit pressure, where Cal = 1 - F × P. The compensation setting value query module is used to query the target setting value T and the compensation setting value offset from a preset database; The target displacement value calculation module is used to calculate and generate the target displacement value S based on the target set value T, the compensation set value offset and the pressing coefficient Cal, where S = T × Cal + offset; The pressing depth control command generation module is used to generate and execute pressing depth control commands based on the target displacement value S.

3. A smart terminal, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and executed as described in claim 1.

4. A computer-readable storage medium, characterized in that, The computer program is stored that can be loaded by a processor and executed as described in claim 1.

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