Multi-stage linkage positioning system of turret type punching machine tool

Abstract

The invention belongs to the technical field of plate processing, and particularly relates to a multi-stage linkage positioning system of a turret type punching machine tool, which is arranged on the turret type punching machine tool, and the turret type punching machine tool comprises a turret punching execution unit, a plate feeding unit and a numerical control unit; the multi-stage linkage positioning system comprises a distance sensor array arranged at the lower end of a punching head of a turret punching execution unit; the multi-stage supporting module comprises supporting piece sets arranged in a matrix mode, and composite brushes are arranged at the top ends of supporting pieces. The deformation compensation control module is electrically connected with the distance sensor array and the supporting piece and electrically connected with a numerical control unit of the machine tool. Compared with the prior art, the problem that in the prior art, when a plate is machined in a turret punch press, errors of the punching position are possibly caused by tiny deformation is solved, and the effects that accurate compensation is conducted in real time when the plate is punched, punching position deviation caused by plate deformation is avoided, the plate machining quality is improved, and plate damage is prevented are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of plate processing, and in particular relates to a multi-stage linkage positioning system for a turret punching machine tool. Background Art

[0002] As an important equipment in the field of sheet metal processing, the turret punching machine is widely used in many manufacturing fields due to its efficient processing capabilities and high-precision operation results. It cleverly integrates multi-station molds through the turret structure and combines advanced CNC technology to achieve fast and accurate punching operations on the sheet metal. Its core technology is mainly reflected in the rapid switching of molds, precise positioning of the sheet metal, and effective control of deformation during the stamping process.

[0003] Traditional turret punch presses usually use mechanical transmission or hydraulic drive to complete the punching action, and use a servo feeding system to achieve precise positioning of the sheet. However, with the continuous development of the manufacturing industry, the demand for processing ultra-thin sheets (such as aluminum alloys below 0.5 mm) and highly complex parts is increasing, which brings new challenges to traditional turret punch press technology. When processing ultra-thin sheets, due to the particularity of the material, the traditional stamping method easily leads to increased difficulty in controlling sheet deformation and difficulty in ensuring processing accuracy. At the same time, the processing of highly complex parts requires the punch press to have higher positioning accuracy and faster mold switching speed, which puts higher requirements on the performance of the equipment. In addition, when facing these new materials and new demands, traditional technologies may also face problems such as accelerated mold wear and limited processing efficiency. Further technological innovation and improvement are needed to adapt to the development needs of modern manufacturing.

[0004] Patent CN113182424A discloses a CNC turret punch press, including a machine body, a fixed workbench installed on the machine body, a punching mechanism fixed to the machine body, a conveying mechanism and a positioning mechanism fixed to the fixed workbench. This invention achieves the effect of ensuring the flatness of the plate after processing by clamping the plate during the punching process, but the clamping operation may also cause deformation of the plate.

[0005] In summary, the existing turret punching technology urgently needs a solution that can dynamically sense sheet deformation, intelligently adjust the support structure, and efficiently coordinate multi-station molds, so as to break through the technical barriers of high-precision processing of thin plates. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] The purpose of the present invention is to provide a multi-stage linkage positioning system for a turret punching machine in order to solve at least one of the above problems, so as to solve the problem in the prior art that when the plate is processed in the turret punching machine, slight deformation may cause errors in the punching position, so as to achieve real-time and accurate compensation for the plate when punching to avoid punching position deviation caused by plate deformation, improve the plate processing quality, and prevent plate damage.

[0008] (II) Technical solution

[0009] The purpose of the present invention is achieved through the following technical solutions:

[0010] The present invention discloses a multi-stage linkage positioning system for a turret punching machine tool, which is arranged on the turret punching machine tool. The turret punching machine tool comprises a turret punching execution unit, a plate feeding unit and a numerical control unit; the multi-stage linkage positioning system comprises:

[0011] A distance sensor array is arranged at the lower end of the punching head of the turret punching execution unit;

[0012] The multi-level support module is arranged in a matrix, including a support member and a composite brush disposed on the top of the support member;

[0013] The deformation compensation control module is electrically connected to the distance sensor array and the support member respectively, and is electrically connected to the numerical control unit of the machine tool.

[0014] Furthermore, a piezoelectric ceramic sensor is provided between the support member and the composite brush unit for real-time monitoring of the contact pressure distribution between the brush and the plate.

[0015] Furthermore, the deformation compensation control module includes:

[0016] A deformation calculation unit, used to calculate the local deformation degree of the plate according to the detection data of the distance sensor array;

[0017] The pressure distribution unit generates a compensation displacement of the support members based on the local deformation degree of the plate, wherein at least 30% of the support members perform descent compensation and at least 20% of the support members perform lift compensation.

[0018] Furthermore, the support member is configured as any one of an air cylinder and an electric cylinder, and the composite brush is disposed at the top end of a piston rod of the air cylinder or the electric cylinder.

[0019] Furthermore, the support member is configured as a cylinder, and the composite brush is disposed at the top end of a piston rod of the cylinder.

[0020] Furthermore, the composite brush is composed of long hair and short hair mixed in a ratio of 1:1-1:3, the short hair is 20-50% shorter than the long hair, and the stiffness of the short hair is 1.5-3 times that of the long hair.

[0021] Furthermore, the composite brush is composed of long hair and short hair mixed in a ratio of 1:1, the short hair is 30% shorter than the long hair, and the stiffness of the short hair is twice that of the long hair.

[0022] Furthermore, the short hairs of the composite brush are made of silicon carbide reinforced nylon material, and the long hairs are made of polyester fiber material.

[0023] Furthermore, the composite brushes are arranged on the top of the support member in a rectangular distribution inscribed in the support member.

[0024] Furthermore, the distance sensor array includes a plurality of laser distance measuring sensors distributed in a ring shape with the punching head as the center.

[0025] Furthermore, the detection accuracy of the laser ranging unit is ±0.01mm, and the sampling frequency is not less than 1000Hz.

[0026] Furthermore, the system also includes an exception handling module, which automatically starts lifting or lowering 3×3 supports around the corresponding support member in the same direction as the corresponding support member when the deformation compensation control module detects that the displacement of a single support member exceeds a compensation amount set threshold.

[0027] Furthermore, the linkage logic of the deformation compensation control module includes:

[0028] When the pressure of a single support member drops by more than 15%, it is determined that the local plate is sunken, and the support members in the surrounding area of ​​the corresponding support member are lifted;

[0029] When the pressure of multiple support parts continues to rise, the plate is judged to be warped, triggering full-area laser scanning and controlling the support parts to perform reverse compensation.

[0030] When the support member performs reverse compensation, since one end of the plate is clamped and fixed by the plate feeding unit, the compensatory support effect of the support member located below the other end of the plate on the plate is sufficient to restore the deformation of the plate.

[0031] Furthermore, when the system performs punching operations on a turret punching machine, the deformation compensation control module dynamically adjusts the displacement of the cylinder group at a rate greater than or equal to twice the movement frequency of the punching head, and the displacement change gradient within adjacent adjustment cycles does not exceed 0.2 mm / ms.

[0032] Furthermore, the system also includes a plate positioning module, which is arranged at both ends of the plate fixing member of the plate feeding unit and includes two positioning members.

[0033] Furthermore, the plate positioning module is used to locate the position of the plate so that the plate can be transported to the next operation location for direct operation after punching is completed.

[0034] Furthermore, the punching process in which the system participates includes the following steps: before punching, the plate feeding unit clamps the plate at a suitable position through the plate positioning module, the plate is moved to the bottom of the punching head for punching, and during the punching process, the multi-stage support module is located under the plate, the piezoelectric ceramic sensor monitors the pressure changes of the support parts in real time, and the distance sensor array monitors the deformation of the plate in real time; if the pressure fluctuation exceeds the threshold and the plate is deformed, the corresponding cylinder stroke is adjusted in conjunction with the deformation data, the support parts under the concave area are lifted, and the support parts under the convex area are lowered to compensate for the displacement of the plate; after the punching is completed, the plate positioning module verifies the positioning accuracy and then pushes out the plate.

[0035] (III) Beneficial effects

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] (1) The present invention dynamically adjusts some support members in the multi-stage support module to press down and some support members to lift up through the deformation compensation control module. The principle is to perform differentiated compensation for local depression or warping based on high-precision laser ranging and pressure sensing data. When the compensation amount of a single cylinder exceeds the limit, the coordinated action of the adjacent 3×3 cylinder group is triggered to avoid the tearing of the plate caused by local stress concentration. Therefore, the multi-stage linkage positioning system in the present invention can achieve precise compensation, improve the processing quality of the plate, and at the same time enhance the overload resistance to prevent damage to the plate.

[0038] (2) In the present invention, composite bristles are arranged on the top of the support member below the plate, and long and soft long bristles and short and rigid short bristles are arranged at the same time. Since the short bristles are made of silicon carbide reinforced nylon material and the long bristles are made of polyester fiber material, the high rigidity of the short bristles stably supports the plate, and the flexible buffering of the long bristles reduces the stress rebound at the moment of punching. The multi-level support module adopts a mixed structure of long and short bristles in equal proportions. The short bristles provide rigid support and the long bristles absorb impact vibration, thereby realizing the dual functions of the support member, stabilizing the plate and reducing stress rebound, while extending the service life of the brush and reducing production costs.

[0039] (3) The distance sensor array and piezoelectric ceramic sensor in the present invention monitor in real time, and use real-time detection data and rapid feedback to ensure that the compensation action is synchronized with the punching rhythm. At the same time, the deformation compensation control module is electrically connected to the machine tool main control system, and the cylinder displacement is adjusted at a rate at least twice the punch movement frequency, thereby ensuring the real-time compensation of the plate deformation, reducing processing delays, and improving processing efficiency. At the same time, adaptive adjustment is achieved to adapt to different working conditions and enhance system flexibility.

[0040] (4) The multi-level linkage positioning system of the present invention has a simple structure, low cost and is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 The present invention is a schematic diagram of the overall structure of a multi-stage linkage positioning system of a turret punching machine tool.

[0043] Figure 2 It is a front view of a multi-stage linkage positioning system of a turret punching machine tool of the present invention.

[0044] Figure 3 It is a structural schematic diagram of a distance sensor array in a multi-stage linkage positioning system of a turret punching machine tool of the present invention.

[0045] Figure 4 It is a structural schematic diagram of a multi-stage support module array in a multi-stage linkage positioning system of a turret punching machine tool of the present invention.

[0046] Figure 5 It is a structural schematic diagram of a multi-stage support module in a multi-stage linkage positioning system of a turret-type punching machine tool of the present invention.

[0047] Figure 6 It is a side view of a multi-stage support module in a multi-stage linkage positioning system of a turret punching machine tool of the present invention.

[0048] In the figure: 1-distance sensor array; 11-laser distance sensor; 2-multi-stage support module; 21-support member; 22-composite brush; 3-laser positioning member. DETAILED DESCRIPTION

[0049] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0050] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0051] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0052] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0053] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0054] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0055] Example 1

[0056] See also Figures 1 to 5 The present invention provides a multi-stage linkage positioning system for a turret punching machine tool, which is arranged on the turret punching machine tool. The turret punching machine tool includes a turret punching execution unit, a plate feeding unit and a numerical control unit; the multi-stage linkage positioning system includes a distance sensor array 1, a multi-stage support module 2, a deformation compensation control module, an abnormality processing module and a plate positioning module.

[0057] Please refer again Figure 3 The distance sensor array 1 is arranged at the lower end of the punching head of the turret punching execution unit, and includes a plurality of laser distance measuring sensors 11 distributed in a ring with the punching head as the center, wherein the detection accuracy of the laser distance measuring unit 11 is ±0.01mm, and the sampling frequency is not less than 1000Hz.

[0058] Please refer again Figure 4-Figure 6The multi-level support module 2 is arranged in a matrix, including a support member 21 and a composite brush 22 arranged at the top of the support member 21; the support member 21 is configured as a cylinder, and the composite brush 22 is arranged at the top of the piston rod of the cylinder; a piezoelectric ceramic sensor is arranged between the support member 21 and the composite brush unit 22 for real-time monitoring of the contact pressure distribution between the brush and the plate.

[0059] Please refer again Figure 6 The short hairs in the composite brush 22 are made of silicon carbide reinforced nylon material, and the long hairs are made of polyester fiber material. The composite brush 22 is composed of long hairs and short hairs mixed in a 1:1 ratio. The length of the short hairs is 30% shorter than that of the long hairs, and the stiffness of the short hairs is twice that of the long hairs.

[0060] The deformation compensation control module is electrically connected to the distance sensor array 1 and the support member 21 respectively, and is electrically connected to the numerical control unit of the machine tool, and includes a deformation calculation unit and a pressure distribution unit; the deformation calculation unit is used to calculate the local deformation degree of the plate according to the detection data of the distance sensor array 1; the pressure distribution unit generates the compensation displacement of the support member 21 based on the local deformation degree of the plate, wherein at least 30% of the support members 21 perform descent compensation, and at least 20% of the support members 21 perform lifting compensation.

[0061] Please refer again Figure 4 When the deformation compensation control module detects that the displacement of a single support member 21 exceeds the compensation amount setting threshold, the abnormality processing module automatically starts the 3×3 support members 21 around the corresponding support member 21 to lift or lower in the same direction as the corresponding support member 21.

[0062] Please refer again Figure 2 The plate positioning module is arranged at both ends of the plate fixing member of the plate feeding unit, and includes two positioning members 3 for positioning the plate position so as to facilitate direct operation when the plate is punched.

[0063] Please refer again Figure 1 The punching process in which the system participates includes the following steps: before punching, the sheet feeding unit clamps the sheet at a suitable position through the sheet positioning module, and the sheet moves to the bottom of the punching head for punching. During the punching process, the multi-stage support module 2 is located under the sheet, and the piezoelectric ceramic sensor monitors the pressure change of the support member 21 in real time, and the distance sensor array 1 monitors the deformation of the sheet in real time; if the pressure fluctuation exceeds the threshold and the sheet is deformed, the corresponding cylinder stroke is adjusted in linkage according to the deformation data, the support member 21 under the concave area is lifted, and the support member 21 under the convex area is lowered to compensate for the displacement of the sheet; after the punching is completed, the sheet positioning module verifies the positioning accuracy and then pushes out the sheet.

[0064] The same and similar parts between the various embodiments in this specification can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0065] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A multi-stage linkage positioning system for a turret punching machine tool, characterized in that: It is arranged on a turret punching machine tool, and the turret punching machine tool comprises a turret punching execution unit, a plate feeding unit and a numerical control unit; The multi-level linkage positioning system comprises: A distance sensor array (1) is arranged at the lower end of the punching head of the turret punching execution unit; The multi-stage support module (2) is arranged in a matrix, and comprises a support member (21) and a composite brush (22) disposed at the top of the support member (21); The deformation compensation control module is electrically connected to the distance sensor array (1) and the support member (21) respectively, and is electrically connected to the numerical control unit of the machine tool.

2. The multi-stage linkage positioning system of a turret punching machine tool according to claim 1, characterized in that: A piezoelectric ceramic sensor is arranged between the support member (21) and the composite brush unit (22).

3. The multi-stage linkage positioning system of a turret punching machine tool according to claim 2, characterized in that: The deformation compensation control module comprises: A deformation calculation unit, used for calculating the local deformation degree of the plate according to the detection data of the distance sensor array (1); The pressure distribution unit generates a compensation displacement of the support members (21) based on the local deformation degree of the plate, wherein at least 30% of the support members (21) perform descent compensation and at least 20% of the support members (21) perform lift compensation.

4. The multi-stage linkage positioning system of a turret punching machine tool according to claim 3 is characterized in that: The support member (21) is configured as any one of an air cylinder and an electric cylinder, and the composite brush (22) is arranged at the top end of the piston rod of the air cylinder or the electric cylinder.

5. The multi-stage linkage positioning system of a turret punching machine tool according to claim 4, characterized in that: The composite brush (22) is composed of long hair and short hair mixed in a ratio of 1:1-1:3, the short hair is 20-50% shorter than the long hair, and the short hair has a stiffness 1.5-3 times that of the long hair.

6. The multi-stage linkage positioning system of a turret punching machine tool according to claim 5, characterized in that: The short hairs of the composite brush (22) are made of silicon carbide reinforced nylon material, and the long hairs are made of polyester fiber material.

7. The multi-stage linkage positioning system of a turret punching machine tool according to claim 6, characterized in that: The distance sensor array (1) comprises a plurality of laser distance measuring sensors (11) distributed in a ring shape with the punching head as the center.

8. The multi-stage linkage positioning system of a turret punching machine tool according to claim 7, characterized in that: The system further comprises an abnormality processing module, which automatically starts the 3×3 supports (21) around the corresponding support (21) to be lifted or lowered in the same direction as the corresponding support (21) when the deformation compensation control module detects that the displacement of a single support (21) exceeds a compensation amount set threshold.

9. The multi-stage linkage positioning system of a turret punching machine tool according to claim 8, characterized in that: The system further comprises a plate positioning module, which is arranged at both ends of the plate fixing member of the plate feeding unit and comprises two positioning members (3).

10. The multi-stage linkage positioning system of a turret punching machine tool according to claim 9, characterized in that: The punching process in which the system is involved comprises the following steps: before punching, the sheet material feeding unit clamps the sheet material at a suitable position through the sheet material positioning module, the sheet material is moved to the bottom of the punching head for punching, during the punching process, the multi-level support module (2) is located under the sheet material, the piezoelectric ceramic sensor monitors the pressure change of the support member (21) in real time, and the distance sensor array (1) monitors the deformation of the sheet material in real time; If the pressure fluctuation exceeds the threshold value and the plate is deformed, the corresponding cylinder stroke is adjusted in linkage according to the deformation data, the support member (21) below the concave area is lifted, and the support member (21) below the convex area is lowered to compensate for the displacement of the plate; after the punching is completed, the plate positioning module verifies the positioning accuracy and then pushes out the plate.

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