Pneumatic punching machine and precision monitoring system thereof

Abstract

The invention provides a pneumatic punching machine and a precision detection system thereof. The pneumatic punching machine comprises a machine base, a workbench, a pneumatic hydraulic cylinder and a punching head. The base provides a mounting space; the workbench is arranged on the machine base, the workbench is provided with at least one working area, each working area is detachably provided with at least one stamping die, and each stamping die is provided with at least one working axis; at least one pneumatic hydraulic cylinder is arranged on the base, and a piston rod of the pneumatic hydraulic cylinder is connected with the punching head; the at least one punching head is provided with one or more track axes corresponding to the working axes; the air source is connected with the pneumatic hydraulic cylinder; the device further comprises an electrical assembly, and the electrical assembly is connected with the air source and the pneumatic hydraulic cylinder and is configured to adjust punching parameters of pneumatic punching. Multi-precision monitoring and calibration in the machining process of the small pneumatic stamping equipment are achieved, and the machining precision of the small pneumatic stamping equipment is effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of small stamping processing equipment, and in particular relates to a pneumatic stamping machine and a precision monitoring system thereof. Background Art

[0002] In modern industrial production, stamping is an extremely common and important manufacturing process, widely used in many fields such as automobiles, electronics, and machinery, and is used to process raw materials such as plates into parts of various shapes. As one of the key equipment for stamping, pneumatic stamping machines have been favored by many manufacturers due to their relatively simple structure, low cost, easy access to power sources, and flexible operation.

[0003] However, with the increasing requirements of the manufacturing industry for product quality, pneumatic stamping machines have exposed some urgent problems in actual use. Traditional monitoring methods for stamping machines are relatively limited, and it is impossible to grasp the key parameters and processing accuracy of the stamping process in real time, comprehensively and accurately. Especially for small stamping equipment, it has high requirements for stamping accuracy when stamping small workpieces, and due to the rigidity of the mold itself, once the mold itself is deformed due to material fatigue after being subjected to stamping pressure, it will affect the processing quality of the batch.

[0004] In view of this, there is an urgent need to provide a pneumatic punching machine and a precision monitoring system thereof. Summary of the invention

[0005] To this end, the present invention provides a pneumatic stamping machine and a precision monitoring system thereof, which perform multi-precision monitoring and calibration during the processing of small pneumatic stamping equipment, thereby improving the processing precision of the small pneumatic stamping equipment.

[0006] A first aspect of the present invention provides a pneumatic punching machine, comprising a machine base, a workbench, a pneumatic hydraulic cylinder and a punching head;

[0007] The base provides installation space;

[0008] The workbench is arranged on the machine base, and the workbench has at least one working area, at least one stamping die is detachably arranged on each of the working areas, and each of the stamping dies has at least one working axis;

[0009] At least one of the pneumatic hydraulic cylinders is disposed on the machine base, and a piston rod of the pneumatic hydraulic cylinder is connected to the punching head;

[0010] At least one of the punch heads has one or more trajectory axes corresponding to each of the working axes;

[0011] Also included is an air source, the air source being connected to the pneumatic hydraulic cylinder;

[0012] It also includes an electrical component, which is connected to the air source and the pneumatic hydraulic cylinder, and is configured to adjust the stamping parameters of the pneumatic stamping.

[0013] As a preferred embodiment, the punching head has at least one punching surface, and the geometric center of the punching surface is the trajectory axis along the movement direction of the piston rod of the pneumatic hydraulic cylinder.

[0014] As a preferred embodiment, the punching head has a plurality of punching surfaces, and the trajectory axes formed by the geometric centers of the punching surfaces coincide with the working axes of the plurality of punching dies.

[0015] As a preferred embodiment, the stamping die is installed in the working area through a positioning die;

[0016] The positioning die is used to adjust the working axis of the stamping die to coincide with the trajectory axis.

[0017] A second aspect of the present invention provides a precision monitoring system for a pneumatic punching machine, comprising an axis coincidence monitoring unit, a first die surface monitoring unit, a second die surface monitoring unit, a first data processing unit, a second data processing unit and a central processing unit;

[0018] The axis coincidence monitoring unit comprises a first light source and a first light sensor, wherein the first light source is configured to emit laser light in the plane direction of the track axis, and the first light sensor is configured to receive a first reflected light after being reflected by a stamping die or a positioning die;

[0019] The first mold surface monitoring unit includes a second light source and a second light sensor, the second light source is configured to emit laser light in the direction of the working axis, and the second light sensor is configured to receive a second reflected light after being reflected by the stamping mold or the positioning mold;

[0020] The second mold surface monitoring unit includes a third light source and a third light sensor group, the third light source is configured to emit laser light to the workpiece surface, and the light sensor is configured to receive the third reflected light after being reflected by the workpiece surface;

[0021] The first data processing unit is configured to obtain first reflection data and third reflection data of the first reflected light and the second reflected light;

[0022] The second data processing unit is configured to obtain third reflection data of the third reflected light;

[0023] A central processing unit is connected to the axis coincidence monitoring unit, the first mold surface monitoring unit, the second mold surface monitoring unit, the first data processing unit, and the second data processing unit, and receives signals from each unit and provides a response;

[0024] And the central processing unit is configured to calculate the axis coincidence degree according to the first reflection data and the second reflection data;

[0025] The method is further configured to calculate the machining accuracy of the workpiece surface according to the third reflection data.

[0026] As a preferred embodiment, it further includes a displacement monitoring unit;

[0027] The displacement monitoring unit includes a plurality of displacement sensors;

[0028] A displacement sensor is installed on the punch head, which measures the vertical displacement of the punch head relative to the initial position along the movement direction of the piston rod and can convert the displacement change information into an electrical signal for external output; at the same time, a displacement sensor is also installed on the workbench corresponding to the position of each stamping die.

[0029] As a preferred embodiment, it also includes an alarm prompt unit, which initiates an alarm when the deviation between the trajectory axis of the punch head and the working axis of the punch die exceeds a preset axis coincidence accuracy threshold, or the pressure in the pneumatic hydraulic cylinder exceeds a preset pressure safety range, or the vertical displacement of the punch head and the horizontal displacement of the stamping die exceed the corresponding displacement accuracy threshold.

[0030] As a preferred embodiment, it further includes a data storage unit;

[0031] The axis coincidence data, pressure data, displacement data and corresponding accuracy judgment results of each stamping process are stored in chronological order, and the stored data can be exported in a standard data format.

[0032] As a preferred method, the axis coincidence data monitored by the axis coincidence monitoring unit can be fed back to the electrical components of the positioning mold in real time, and the positioning parameters of the positioning mold can be automatically adjusted according to the feedback data, thereby fine-tuning the working axis of the stamping mold to better coincide with the trajectory axis of the stamping head.

[0033] As a preferred embodiment, the central processing unit is configured to perform the following steps:

[0034] S1. Before punching, calibrate the overlap according to the first reflection data and the second reflection data;

[0035] S2, continuously sampling multiple groups of first reflected lights when the first light source emits to the same positioning point, and if the reflection angles of the multiple groups of first reflected lights are all within a preset range, taking the average reflection angle of each reflection angle as the reference verticality;

[0036] S3, continuously sampling multiple groups of second reflected lights when the second light source emits to the same positioning point, and if the reflection angles of the multiple groups of second reflected lights are all within a preset range, calculating a first angle difference between an average reflection angle of each reflection angle and a reference verticality;

[0037] S4, after changing the positioning point of the second light source, execute S3, calculate the second angle difference between the reflection angles of the two when S3 is executed this time and the previous time S3 is executed, and then execute this step multiple times in a loop until the positioning point sampling amount reaches a preset value;

[0038] S5. If the difference between the first angle change rate between the plurality of consecutive first angle differences and the second angle change rate between the plurality of consecutive second angle differences is within the preset threshold, and the first angle difference is within the preset threshold, then the axis coincidence degree meets the preset axis coincidence degree threshold and the next step is executed.

[0039] Otherwise, the installation calibration signal is initiated and the process returns to S1;

[0040] S6, traverse all the positioning points of the positioning mold, obtain the second angle change rate, and mark the first deformation mark point whose second angle change rate is outside the preset threshold in the reference shape according to the reference shape of the positioning mold, and return to S5 for verification. If the first deformation mark point exists in S5, execute S4 again until the first deformation mark point does not exist;

[0041] S7, traverse all the positioning points of the stamping die, obtain the second angle change rate, and mark the second deformation mark point whose second angle change rate is outside the preset threshold value in the reference shape according to the reference shape of the stamping die, and return to S5 for verification. If the first deformation mark point exists in S5, execute S4 again until the second deformation mark point does not exist;

[0042] S8, when performing stamping, calibrate the displacement according to the first reflection data and the second reflection data, and perform the same steps as S1-S5;

[0043] Obtaining the reference verticality of each stroke position in the stamping process, and obtaining the displacement of the stamping head according to multiple sets of reference verticalities;

[0044] And simultaneously obtain the displacement of the stamping die and the positioning die;

[0045] S9, calibrating the displacement in S8 with the displacement obtained by the displacement sensor to eliminate displacement errors other than relative displacement;

[0046] S10, after stamping, performing the same steps as S2 on the first deformation mark point and the second deformation mark point to obtain a deformation error;

[0047] S11. Acquire a continuous third angle change rate according to the third reflection data, and obtain a machining accuracy according to a reference shape of the stamping surface, a displacement error and a deformation error.

[0048] The above technical solution of the present invention has the following advantages compared with the prior art:

[0049] 1. The present invention uses an axis coincidence monitoring unit, a first mold surface monitoring unit and a second mold surface monitoring unit to perform real-time monitoring from multiple aspects such as axis coincidence, mold surface status and workpiece surface processing accuracy, so as to comprehensively and accurately grasp various key precision indicators in the stamping process, timely discover potential precision problems and take corresponding measures.

[0050] 2. The present invention can accurately obtain reflected light data and perform effective data processing and analysis through the coordination of each light source and light sensor and the setting of the first data processing unit and the second data processing unit, thereby providing a reliable data basis for subsequent precision evaluation and control and ensuring the accuracy and credibility of the monitoring results.

[0051] 3. During the stamping process, the present invention can monitor in real time the parameters such as the overlap between the trajectory axis and the working axis, the displacement between the punch head and the mold, the pressure between the molds, and the deformation recovery of the molds, and send out an alarm signal in time through the alarm unit when an abnormal situation occurs, such as excessive axis overlap, excessive displacement, abnormal pressure or poor deformation recovery, etc., effectively preventing batch product defects caused by precision problems and reducing production losses. It has a complete set of calibration processes, such as accurate calibration of axis overlap and displacement before and during stamping. Through the sampling, analysis and comparison of multiple sets of reflected light data, it can timely detect and correct axis deviation and displacement error, ensure that the stamping equipment is always in a high-precision working state, and effectively detect and mark the deformation of the mold, providing a scientific basis for the maintenance and replacement of the mold, and further ensuring the accuracy and stability of the stamping process. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a structural schematic diagram of the pneumatic punching machine provided by the present invention;

[0053] Figure 2 It is a structural block diagram of the precision monitoring system of the pneumatic punching machine provided by the present invention.

[0054] Among them, 1. Machine base; 2. Workbench; 3. Positioning mold; 4. Pneumatic hydraulic cylinder; 5. Electrical components; 6. Air source. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] In a first aspect of the embodiments of the present disclosure, a pneumatic punching machine is provided. Figure 1 As shown, it includes a machine base 1, a workbench 2, a pneumatic hydraulic cylinder 4 and a punching head; the machine base 1 provides an installation space; the workbench 2 is arranged on the machine base 1, and the workbench 2 has at least one working area (not shown in the figure), and at least one stamping die (not shown in the figure) is detachably arranged on each of the working areas, and each of the stamping dies has at least one working axis; at least one of the pneumatic hydraulic cylinders 4 is arranged on the machine base 1, and the piston rod of the pneumatic hydraulic cylinder 4 is connected to the punching head; at least one of the punching heads has one or more trajectory axes corresponding to each of the working axes; it also includes an air source 6, which is connected to the pneumatic hydraulic cylinder 4; it also includes an electrical component 5, which is connected to the air source 6 and the pneumatic hydraulic cylinder 4, and the electrical component 5 is configured to adjust the stamping parameters of the pneumatic stamping.

[0057] In the embodiments of the present disclosure, the setting of the working area and the setting of the stamping die are common technical means in the art and will not be elaborated here.

[0058] As a preferred embodiment, the punching head has at least one punching surface, and the geometric center of the punching surface is the trajectory axis along the movement direction of the piston rod of the pneumatic hydraulic cylinder 4.

[0059] As a preferred embodiment, the punching head has a plurality of punching surfaces, and the trajectory axes formed by the geometric centers of the punching surfaces coincide with the working axes of the plurality of punching dies.

[0060] As a preferred embodiment, the stamping die is installed in the working area through a positioning die 3;

[0061] The positioning die 3 is used to adjust the working axis of the stamping die to coincide with the trajectory axis.

[0062] A second aspect of the disclosed embodiment provides a monitoring system for a pneumatic punching machine, such as Figure 2 As shown, it includes an axis coincidence monitoring unit, a first mold surface monitoring unit, a second mold surface monitoring unit, a first data processing unit, a second data processing unit and a central processing unit;

[0063] The axis coincidence monitoring unit comprises a first light source and a first light sensor, wherein the first light source is configured to emit laser light in the plane direction of the track axis, and the first light sensor is configured to receive the first reflected light after being reflected by the stamping die or the positioning die 3;

[0064] The first mold surface monitoring unit includes a second light source and a second light sensor, the second light source is configured to emit laser light in the direction of the working axis, and the second light sensor is configured to receive a second reflected light after being reflected by the stamping mold or the positioning mold 3;

[0065] The second mold surface monitoring unit includes a third light source and a third light sensor group, the third light source is configured to emit laser light to the workpiece surface, and the light sensor is configured to receive the third reflected light after being reflected by the workpiece surface;

[0066] The first data processing unit is configured to obtain first reflection data and third reflection data of the first reflected light and the second reflected light;

[0067] The second data processing unit is configured to obtain third reflection data of the third reflected light;

[0068] A central processing unit is connected to the axis coincidence monitoring unit, the first mold surface monitoring unit, the second mold surface monitoring unit, the first data processing unit, and the second data processing unit, and receives signals from each unit and provides a response;

[0069] The central processing unit is configured to calculate the axis coincidence according to the first reflection data and the second reflection data; and is also configured to calculate the machining accuracy of the workpiece surface according to the third reflection data.

[0070] As a preferred embodiment, it further comprises a displacement monitoring unit; the displacement monitoring unit comprises a plurality of displacement sensors and a pressure sensor;

[0071] A group of displacement sensors is arranged on the punch head;

[0072] A group of displacement sensors are arranged at a non-contact position of the installation gap between the positioning die 3 and the stamping die;

[0073] A group of pressure sensors are arranged at the contact point of the positioning die 3 and the installation gap of the stamping die;

[0074] A group of displacement sensors are arranged at a non-contact position of the installation gap between the positioning mold 3 and the working area;

[0075] A group of the pressure sensors are arranged at the contact position of the positioning mold 3 and the installation gap of the working area;

[0076] The displacement sensor is configured to measure the displacement of the punch head, the relative displacement between the positioning die 3 and the punching die, and the relative displacement between the positioning die 3 and the working area;

[0077] The pressure sensor is configured to measure the relative working pressure between the positioning die 3 and the stamping die, and the relative working pressure between the positioning die 3 and the stamping die.

[0078] In the embodiment of the present disclosure, the working area, the positioning mold, and the stamping mold have relative contact points and non-contact points when they are installed, and all three are detachably connected, so they will be subjected to stamping pressure and produce relative displacement.

[0079] As a preferred embodiment, the device further comprises an alarm unit, which is configured to initiate an alarm when an abnormal signal is received;

[0080] The abnormal signals include:

[0081] The degree of overlap between the trajectory axis and the working axis exceeds a preset axis overlap threshold during the stamping process;

[0082] The vertical displacement and / or horizontal displacement of the punch head exceeds a preset displacement threshold;

[0083] The relative vertical displacement and / or relative horizontal displacement between the positioning die 3 and the stamping die exceeds a preset relative displacement threshold;

[0084] The relative working pressure between the positioning die 3 and the stamping die exceeds a preset pressure threshold;

[0085] The deformation recovery amount of the positioning die 3 or the stamping die after stamping is lower than a preset deformation recovery threshold.

[0086] As a preferred embodiment, it also includes a storage unit, which is configured to obtain all data from the axis coincidence monitoring unit, the first mold surface monitoring unit, the second mold surface monitoring unit, the first data processing unit, the second data processing unit, the displacement monitoring unit and the alarm unit and generate a work log for each unit according to the timestamp.

[0087] As a preferred embodiment, the central processing unit is configured to perform the following steps:

[0088] S1. Before punching, calibrate the overlap according to the first reflection data and the second reflection data;

[0089] S2, continuously sampling multiple groups of first reflected lights when the first light source emits to the same positioning point, and if the reflection angles of the multiple groups of first reflected lights are all within a preset range, taking the average reflection angle of each reflection angle as the reference verticality;

[0090] S3, continuously sampling multiple groups of second reflected lights when the second light source emits to the same positioning point, and if the reflection angles of the multiple groups of second reflected lights are all within a preset range, calculating a first angle difference between an average reflection angle of each reflection angle and a reference verticality;

[0091] S4, after changing the positioning point of the second light source, execute S3, calculate the second angle difference between the reflection angles of the two when S3 is executed this time and the previous time S3 is executed, and then execute this step multiple times in a loop until the positioning point sampling amount reaches a preset value;

[0092] S5. If the difference between the first angle change rate between the plurality of consecutive first angle differences and the second angle change rate between the plurality of consecutive second angle differences is within the preset threshold, and the first angle difference is within the preset threshold, then the axis coincidence degree meets the preset axis coincidence degree threshold and the next step is executed.

[0093] Otherwise, the installation calibration signal is initiated and the process returns to S1;

[0094] S6, traverse all the positioning points of the positioning mold, obtain the second angle change rate, and mark the first deformation mark point whose second angle change rate is outside the preset threshold in the reference shape according to the reference shape of the positioning mold, and return to S5 for verification. If the first deformation mark point exists in S5, execute S4 again until the first deformation mark point does not exist;

[0095] S7, traverse all the positioning points of the stamping die, obtain the second angle change rate, and mark the second deformation mark point whose second angle change rate is outside the preset threshold value in the reference shape according to the reference shape of the stamping die, and return to S5 for verification. If the first deformation mark point exists in S5, execute S4 again until the second deformation mark point does not exist;

[0096] S8, when performing stamping, calibrate the displacement according to the first reflection data and the second reflection data, and perform the same steps as S1-S5;

[0097] Obtaining the reference verticality of each stroke position in the stamping process, and obtaining the displacement of the stamping head according to multiple sets of reference verticalities;

[0098] And simultaneously obtain the displacement of the stamping die and the positioning die;

[0099] S9, calibrating the displacement in S8 with the displacement obtained by the displacement sensor to eliminate displacement errors other than relative displacement;

[0100] S10, after stamping, performing the same steps as S2 on the first deformation mark point and the second deformation mark point to obtain a deformation error;

[0101] S11. Acquire a continuous third angle change rate according to the third reflection data, and obtain a machining accuracy according to a reference shape of the stamping surface, a displacement error and a deformation error.

[0102] Specifically, in the disclosed embodiment, during the stamping process, the displacement is calibrated according to the first reflection data and the second reflection data (according to step S8, multiple groups of first reflection lights emitted by the first light source to the same positioning point and multiple groups of second reflection lights emitted by the second light source to the same positioning point are continuously sampled). The reference verticality at each stroke position in the stamping process is obtained, and the theoretical displacement of the punch head is calculated by the changes in the multiple groups of reference verticalities. For example, if the difference between two adjacent groups of reference verticalities changes, the theoretical displacement change value of the punch head in this time period is calculated based on the geometric relationship and the known parameters of the direction of motion of the punch head.

[0103] At the same time, the displacement sensor installed on the punch head is used to obtain the actual displacement data of the punch head. The theoretical displacement is compared with the actual displacement measured by the displacement sensor, and the difference between the two is calculated. This difference is the displacement error of the punch head.

[0104] If the displacement error exceeds the preset displacement error allowable range, the moving parts of the stamping equipment (such as the piston rod connection part of the pneumatic hydraulic cylinder 4, the guide device, etc.) are checked and adjusted to eliminate the source of the displacement error. For example, check whether the piston rod is bent, whether the guide sleeve is worn, etc. If problems are found, repair or replace the relevant parts in time. Then re-perform the stamping operation and repeat the above displacement error detection and calibration steps until the displacement error is within the allowable range.

[0105] For the displacement error detection of the positioning die 3 and the punching die, the relative displacement data between the positioning die 3 and the punching die is obtained by a displacement sensor set at the non-contact position of the installation gap between the positioning die 3 and the punching die. At different stroke positions in the punching process, the theoretical relative position relationship of the die is calculated based on the first reflection data and the second reflection data (similar to the method of determining the position change using the reflected light data in the calculation of the punching head displacement), and the theoretical relative displacement of the die is obtained.

[0106] Compare the theoretical relative displacement with the actual relative displacement measured by the displacement sensor to calculate the displacement error of the mold. If the mold displacement error exceeds the preset threshold, check the mold installation and fixing structure (such as whether the positioning pin is loose, whether the fastening bolts are tightened, etc.), repair the problems found, and ensure that the mold is firmly installed and the relative position is stable. Then perform the stamping operation again and repeat the mold displacement error detection and calibration steps until the mold displacement error meets the requirements.

[0107] Positioning mold 3 deformation error judgment and calibration:

[0108] After the stamping is performed, the same steps as S2 are performed on the first deformation mark point on the positioning mold 3 (continuously sampling multiple groups of second reflected lights when the second light source emits to the same positioning point). The actual deformation of the positioning mold 3 after the stamping process is calculated based on the change in the reflection angle of the multiple groups of reflected lights, and the deformation error value of the positioning mold 3 is obtained. For example, if the reflection angle at a first deformation mark point has changed significantly compared with before the stamping, the deformation amount of the point is calculated based on the change in the reflection angle, the distance between the light source and the mark point, and the relevant geometric relationship.

[0109] Compare the deformation error of the positioning die 3 with the preset allowable deformation range of the positioning die 3. If the deformation error exceeds the allowable range, check the positioning die 3 to determine whether there are problems such as material fatigue and excessive local force. For minor deformation, you can try to use a repair process (such as local heat treatment correction, etc.); if the deformation is serious, you need to replace the positioning die 3. After repair or replacement, re-perform the stamping operation and re-check the deformation of the positioning die 3 until the deformation error is within the allowable range.

[0110] Similarly, after stamping, a similar step (such as step S2) is performed on the second deformation mark point on the stamping die, and the second light source emits laser light and calculates the deformation error of the stamping die according to the change in the reflection angle of the reflected light. The allowable deformation range of the stamping die is determined based on factors such as the material properties, structural design, and stamping process parameters of the stamping die.

[0111] Compare the calculated stamping die deformation error with the allowable range. If it exceeds the range, analyze the cause of the stamping die deformation, which may be excessive stamping pressure, insufficient die material strength, etc. For repairable deformation, use appropriate repair methods (such as die grinding, repair welding, etc.); if the deformation cannot be repaired, replace the stamping die. After repair or replacement, re-stamp and test the stamping die deformation error to ensure that it is within the allowable range.

[0112] After accurately acquiring and eliminating the displacement error and deformation error, the continuous third angle change rate is obtained based on the third reflection data, and the processing accuracy is recalculated in combination with the reference shape of the stamping surface. For example, when calculating the processing accuracy of a certain feature point on the workpiece surface, the preliminary processing position deviation of the point is first determined based on the original third reflection data, and then the corresponding punch head displacement error, mold displacement error and mold deformation error at this point are subtracted to obtain the corrected processing position deviation, thereby obtaining a more accurate processing accuracy value. In this way, the influence of factors such as displacement of moving parts of the equipment and mold deformation on the processing accuracy can be effectively eliminated, the actual processing accuracy of the product can be improved, and the product quality can be ensured to meet the requirements.

[0113] Therefore, in the stamping process, the disclosed embodiment can monitor in real time the coincidence of the trajectory axis and the working axis, the displacement of the punch head and the die, the pressure between the die, and the deformation recovery of the die, and send out an alarm signal in time when an abnormal situation occurs through the alarm unit, such as the axis coincidence exceeds the standard, the displacement is too large, the pressure is abnormal, or the deformation recovery is poor, etc., effectively preventing batch product defects caused by precision problems and reducing production losses. It has a complete set of calibration processes, such as accurate calibration of the axis coincidence and displacement before and during stamping, and through the sampling, analysis and comparison of multiple sets of reflected light data, it can timely discover and correct the axis deviation and displacement error, ensure that the stamping equipment is always in a high-precision working state, and at the same time, it can effectively detect and mark the deformation of the die, provide a scientific basis for the maintenance and replacement of the die, and further ensure the accuracy and stability of the stamping process. Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technician may use different methods for each specific application to achieve the described functions, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. The technician can clearly understand that for the convenience and simplicity of description, the specific working process of the above-described devices, devices and units can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0114] The flowchart and block diagram in the accompanying drawings show the possible architecture, role and operation of the device, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical role. In some alternative implementations, the role marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed in parallel, and they can sometimes be executed in the opposite order, which can depend on the role involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed in parallel, and they can sometimes be executed in the opposite order, which can depend on the role involved. Each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, may be implemented by a dedicated hardware-based device that performs the specified role or action, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. Pneumatic punching machine, characterized in that, It includes a machine base, a workbench, a pneumatic hydraulic cylinder and a punching head; The base provides installation space; The workbench is arranged on the machine base, and the workbench has at least one working area, at least one stamping die is detachably arranged on each of the working areas, and each of the stamping dies has at least one working axis; At least one of the pneumatic hydraulic cylinders is disposed on the machine base, and a piston rod of the pneumatic hydraulic cylinder is connected to the punching head; At least one of the punch heads has one or more trajectory axes corresponding to each of the working axes; Also included is an air source, the air source being connected to the pneumatic hydraulic cylinder; It also includes an electrical component, which is connected to the air source and the pneumatic hydraulic cylinder, and is configured to adjust the stamping parameters of the pneumatic stamping.

2. The pneumatic punching machine according to claim 1, characterized in that: The punching head has at least one punching surface, and the geometric center of the punching surface is a trajectory axis along the movement direction of the piston rod of the pneumatic hydraulic cylinder.

3. The pneumatic punching machine according to claim 1, characterized in that: The punching head has a plurality of punching surfaces, and the track axes formed by the geometric centers of the punching surfaces coincide with the working axes of the plurality of punching dies respectively.

4. The pneumatic punching machine according to claim 1, characterized in that: The stamping die is installed in the working area through a positioning die; The positioning die is used to adjust the working axis of the stamping die to coincide with the trajectory axis.

5. A precision monitoring system for a pneumatic punching machine, characterized in that: It includes an axis coincidence monitoring unit, a first mold surface monitoring unit, a second mold surface monitoring unit, a first data processing unit, a second data processing unit and a central processing unit; The axis coincidence monitoring unit comprises a first light source and a first light sensor, wherein the first light source is configured to emit laser light in the plane direction of the track axis, and the first light sensor is configured to receive first reflected light after being reflected by the stamping die or the positioning die; The first mold surface monitoring unit includes a second light source and a second light sensor, the second light source is configured to emit laser light in the direction of the working axis, and the second light sensor is configured to receive a second reflected light after being reflected by the stamping mold or the positioning mold; The second mold surface monitoring unit includes a third light source and a third light sensor group, the third light source is configured to emit laser light to the workpiece surface, and the light sensor is configured to receive the third reflected light after being reflected by the workpiece surface; The first data processing unit is configured to obtain first reflection data and third reflection data of the first reflected light and the second reflected light; The second data processing unit is configured to obtain third reflection data of the third reflected light; A central processing unit is connected to the axis coincidence monitoring unit, the first mold surface monitoring unit, the second mold surface monitoring unit, the first data processing unit, and the second data processing unit, and receives signals from each unit and provides a response; And the central processing unit is configured to calculate the axis coincidence degree according to the first reflection data and the second reflection data; The method is further configured to calculate the machining accuracy of the workpiece surface according to the third reflection data.

6. The precision monitoring system for a pneumatic punching machine according to claim 5, characterized in that: Also included is a displacement monitoring unit; The displacement monitoring unit includes a plurality of displacement sensors and pressure sensors; A group of displacement sensors is arranged on the punch head; A group of displacement sensors are arranged at a non-contact position of the installation gap between the positioning die and the stamping die; A group of the pressure sensors are arranged at the contact position of the installation gap between the positioning die and the stamping die; A group of displacement sensors are arranged at a non-contact position of the installation gap between the positioning mold and the working area; A group of the pressure sensors are arranged at the contact point of the installation gap between the positioning mold and the working area; The displacement sensor is configured to measure the displacement of the punch head, the relative displacement between the positioning die and the punching die, and the relative displacement between the positioning die and the working area; The pressure sensor is configured to measure a relative working pressure between the positioning die and the punching die, and a relative working pressure between the positioning die and the punching die.

7. The precision monitoring system for a pneumatic punching machine according to claim 6, characterized in that: Also included is an alarm unit configured to initiate an alarm when an abnormal signal is received; The abnormal signals include: The degree of overlap between the trajectory axis and the working axis exceeds a preset axis overlap threshold during the stamping process; The vertical displacement and / or horizontal displacement of the punch head exceeds a preset displacement threshold; The relative vertical displacement and / or relative horizontal displacement between the positioning die and the stamping die exceeds a preset relative displacement threshold; The relative working pressure between the positioning die and the stamping die exceeds a preset pressure threshold; The deformation recovery amount of the positioning die or the stamping die after stamping is lower than a preset deformation recovery threshold.

8. The precision monitoring system for a pneumatic punching machine according to claim 7, characterized in that: It also includes a storage unit, which is configured to obtain all data from the axis coincidence monitoring unit, the first mold surface monitoring unit, the second mold surface monitoring unit, the first data processing unit, the second data processing unit, the displacement monitoring unit and the alarm unit and generate a work log for each unit according to a timestamp.

9. The precision monitoring system for a pneumatic punching machine according to claim 6, characterized in that: The central processing unit is configured to perform the following steps: S1. Before punching, calibrate the overlap according to the first reflection data and the second reflection data; S2, continuously sampling multiple groups of first reflected lights when the first light source emits to the same positioning point, and if the reflection angles of the multiple groups of first reflected lights are all within a preset range, taking the average reflection angle of each reflection angle as the reference verticality; S3, continuously sampling multiple groups of second reflected lights when the second light source emits to the same positioning point, and if the reflection angles of the multiple groups of second reflected lights are all within a preset range, calculating a first angle difference between an average reflection angle of each reflection angle and a reference verticality; S4, after changing the positioning point of the second light source, execute S3, calculate the second angle difference between the reflection angles of the two when S3 is executed this time and the previous time S3 is executed, and then execute this step multiple times in a loop until the positioning point sampling amount reaches a preset value; S5. If the difference between the first angle change rate between the plurality of consecutive first angle differences and the second angle change rate between the plurality of consecutive second angle differences is within the preset threshold, and the first angle difference is within the preset threshold, then the axis coincidence degree meets the preset axis coincidence degree threshold and the next step is executed. Otherwise, the installation calibration signal is initiated and the process returns to S1; S6, traverse all the positioning points of the positioning mold, obtain the second angle change rate, and mark the first deformation mark point whose second angle change rate is outside the preset threshold in the reference shape according to the reference shape of the positioning mold, and return to S5 for verification. If the first deformation mark point exists in S5, execute S4 again until the first deformation mark point does not exist; S7, traverse all the positioning points of the stamping die, obtain the second angle change rate, and mark the second deformation mark point whose second angle change rate is outside the preset threshold value in the reference shape according to the reference shape of the stamping die, and return to S5 for verification. If the first deformation mark point exists in S5, execute S4 again until the second deformation mark point does not exist; S8, when performing stamping, calibrate the displacement according to the first reflection data and the second reflection data, and perform the same steps as S1-S5; Obtaining the reference verticality of each stroke position in the stamping process, and obtaining the displacement of the stamping head according to multiple sets of reference verticalities; And simultaneously obtain the displacement of the stamping die and the positioning die; S9, calibrating the displacement in S8 with the displacement obtained by the displacement sensor to eliminate displacement errors other than relative displacement; S10, after stamping, performing the same steps as S2 on the first deformation mark point and the second deformation mark point to obtain a deformation error; S11. Acquire a continuous third angle change rate according to the third reflection data, and obtain a machining accuracy according to a reference shape of the stamping surface, a displacement error and a deformation error.

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