Multi-section type clamping device and using method thereof
Through the multi-stage area clamping method of the multi-stage clamping device, the problem of insufficient accuracy and stability in the forming of large plates is solved, and efficient and precise forming effect is achieved.
Patent Information
- Application Number
- CN202510276209.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2025-06-13
AI Technical Summary
When dealing with large plates, the double-point progressive forming process has problems such as instability, rupture, rebound and local depression, resulting in insufficient forming accuracy and stability.
A multi-stage clamping device is adopted, which includes an outer layer, a middle layer and an inner layer plywood. A magnetic suction device is provided between the plywood to form a multi-stage regional clamping method to enhance the clamping effect and reduce rebound.
By reducing the distance between the clamping area and the processing area, the processing accuracy and stability are improved, the rebound phenomenon is reduced, and the efficiency and geometric accuracy of large-scale plate forming are significantly improved.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of incremental forming of metal sheet materials, and particularly relates to a multi-segment clamping device and a using method thereof. Background Art
[0002] Numerical control incremental forming technology is a modern intelligent forming process that integrates numerical control machining, computer-aided design, and plastic forming. This technology draws on the layer manufacturing method in rapid prototyping, discretizes a complex three-dimensional model along the height direction to generate contour machining trajectories for each layer, and the forming tool gradually performs plastic machining on these contours in a two-dimensional plane, thereby finally forming the sheet material into the required part. After more than twenty years of development, incremental forming technology has evolved from the initial negative forming and positive forming into various branch technologies such as two-point incremental forming, double-sided incremental forming, multi-layer sheet incremental forming, and incremental hole expansion. Among them, two-point incremental forming and cumulative double-sided incremental forming, as extended forms of single-point incremental forming, not only maintain the flexibility of the process by introducing additional support tools on both sides of the sheet material but also improve the deformation stability of the material, significantly enhancing the forming efficiency and geometric accuracy of the sheet material. However, for the forming of large-sized sheets, due to the large distance between the clamping area and the processing area, the processing accuracy is often significantly affected. Although the two-point incremental forming process has improved the deformation stability of the sheet material to a certain extent, when applied to large-sized sheets, problems such as instability, cracking, springback, and local depression still exist. These problems indicate that when dealing with large-sized sheets, high requirements are imposed on the clamping device, and the current two-point incremental forming clamping device still needs to be further optimized to improve the forming accuracy and stability.
[0003] Currently, for large-sized sheets, the two-point incremental forming method is generally not adopted, but the single-point incremental forming method with a customized lower support die is used. However, this method requires the design and manufacture of a die, which contradicts the forming concept of low cost, high efficiency, and flexibility of incremental forming and loses its technical advantages.
[0004] To solve the above problems, the present invention provides a multi-segment clamping device and a using method thereof. Summary of the Invention
[0005] To solve the above problems, the present invention provides a multi-segment clamping device and a using method thereof to solve problems such as the accuracy, thickness thinning, and poor surface quality of forming large-sized parts by the two-point incremental forming process.
[0006] To achieve the above object, the present invention provides the following solutions:
[0007] A multi - stage clamping device includes an outer clamping plate, a middle clamping plate, and an inner clamping plate, all of which are hollow in the middle. The middle clamping plate is arranged in the hollow area in the middle of the outer clamping plate, and the inner clamping plate is arranged in the hollow area of the middle clamping plate. Magnetic attraction devices are arranged on the clamping surfaces of the outer clamping plate, the middle clamping plate, and the inner clamping plate.
[0008] Preferably, the outer clamping plate includes an outer upper pressing plate and an outer lower pressing plate, the middle clamping plate includes a middle upper pressing plate and a middle lower pressing plate, and the inner clamping plate includes an inner upper pressing plate and an inner lower pressing plate.
[0009] Preferably, the outer upper pressing plate, the outer lower pressing plate, the middle upper pressing plate, the middle lower pressing plate, the inner upper pressing plate, and the inner lower pressing plate are all square frames that are hollow in the middle.
[0010] Preferably, the magnetic attraction device is a magnet, and the magnet is arranged along the circumference of the square frame.
[0011] Preferably, handles are arranged on the non - clamping surfaces of the outer upper pressing plate, the outer lower pressing plate, the middle upper pressing plate, the middle lower pressing plate, the inner upper pressing plate, and the inner lower pressing plate.
[0012] Preferably, the handles are all arranged at the four corners of the pressing plate where they are located.
[0013] Preferably, the outer upper pressing plate, the outer lower pressing plate, the middle upper pressing plate, the middle lower pressing plate, the inner upper pressing plate, and the inner lower pressing plate are all separately arranged.
[0014] A method for using a multi - stage clamping device includes the following steps:
[0015] Fix the workpiece to be processed using the multi - stage clamping device;
[0016] Process the part of the workpiece to be processed within the hollow area in the middle of the inner clamping plate. After processing, remove the inner clamping plate;
[0017] Process the part of the workpiece to be processed within the hollow area in the middle of the middle clamping plate. After processing, remove the middle clamping plate;
[0018] Process the part of the workpiece to be processed within the hollow area in the middle of the middle clamping plate. After processing, remove the middle clamping plate;
[0019] Process the part of the workpiece to be processed within the hollow area in the middle of the outer clamping plate. After processing, remove the outer clamping plate to obtain the processed workpiece.
[0020] Preferably, before processing the workpiece to be processed, create a machining program on a numerically controlled machine tool, including the following steps:
[0021] Build a 3D model of the target structure in the modeling module of UG, with the model size not exceeding the range of the outer splint.
[0022] Create a ball nose cutter in the machining module.
[0023] Create a geometry body and set the coordinate axis center at the center position of the top layer of the model.
[0024] Create a machining operation, select the depth profile milling, select the created ball nose cutter for the tool, specify the part, the cutting area and the trimming boundary; in the cutting parameters, select the down milling and layer priority for the strategy, and select the layer-to-layer along the part cross helical plunge for the connection; in the non-cutting movement, select the plunge for the approach, and the retract is the same as the approach; select the linear type for the motion output.
[0025] Generate the machining program, input the processed code into the numerical control machine tool, and export the motion trajectories of the two tool heads respectively.
[0026] Preferably, lubricating oil is applied to both sides of the workpiece to be machined and the contact surface of the tool head before forming.
[0027] The present invention has achieved the following technical effects compared with the prior art:
[0028] The present invention uses an outer splint, a middle splint and an inner splint to clamp the workpiece to be machined, forming a multi-stage sub-region clamping method, and then forming a machining form with a short distance between the clamping area and the machining area during the machining process, enhancing the clamping effect, effectively reducing the springback generated during the machining process, and then improving the machining accuracy. Compared with the traditional method of only clamping the periphery of the workpiece to be machined, it has the excellent effects of strong anti-springback ability and high machining accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0030] Figure 1 It is a schematic structural diagram of the multi-stage clamping device of the present invention;
[0031] Figure 2 It is a schematic diagram of the cooperation between the double-point robot incremental forming and the clamping device during the machining process of the present invention;
[0032] Figure 3 It is a schematic diagram of the machining of the inner splint of the multi-stage clamping device of the present invention.
[0033] Figure 4Schematic diagram for machining the inner clamping plate of the multi-stage clamping device of the present invention.
[0034] Figure 5 Schematic diagram for machining the outer clamping plate of the multi-stage clamping device of the present invention.
[0035] Wherein, 1. Outer clamping plate; 2. Handle; 3. Middle clamping plate; 4. Inner clamping plate; 5. Tool head. Specific embodiments
[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0037] To solve the above problems, the present invention provides a multi-stage clamping device and its use method to solve problems such as the accuracy, thickness thinning, and poor surface quality of forming large-sized parts by the double-point incremental forming process.
[0038] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0039] Refer to Figures 1 to 5 , a multi-stage clamping device includes an outer clamping plate, a middle clamping plate, and an inner clamping plate that are all hollow in the middle. The middle clamping plate is arranged in the hollow area in the middle of the outer clamping plate, and the inner clamping plate is arranged in the hollow area of the middle clamping plate. Magnetic attraction devices are arranged on the clamping surfaces of the outer clamping plate, the middle clamping plate, and the inner clamping plate; the present invention uses the outer clamping plate, the middle clamping plate, and the inner clamping plate to clamp the workpiece to be processed, forming a multi-stage sub-region clamping method, and then forming a processing form with a short distance between the clamping area and the processing area during the processing, enhancing its clamping effect, effectively reducing the springback generated during the processing, and thus improving the processing accuracy. Compared with the traditional method of only clamping the periphery of the workpiece to be processed, it has the excellent effects of strong anti-springback ability and high processing accuracy.
[0040] Refer to Figures 1 to 2 , the outer clamping plate includes an outer upper pressing plate and an outer lower pressing plate, the middle clamping plate includes a middle upper pressing plate and a middle lower pressing plate, and the inner clamping plate includes an inner upper pressing plate and an inner lower pressing plate; the workpiece to be processed is clamped by the outer upper pressing plate, the outer lower pressing plate, the middle upper pressing plate, the middle lower pressing plate, the inner upper pressing plate, and the inner lower pressing plate, and is fixed by mutual attraction of the magnetic attraction devices.
[0041] Refer to Figures 1 to 2, the outer upper pressing plate, outer lower pressing plate, middle upper pressing plate, middle lower pressing plate, inner upper pressing plate, and inner lower pressing plate are all square frames with hollowed-out middles.
[0042] Furthermore, the magnetic attraction device is a magnet, and the magnet is arranged along the circumferences of the square frames of the outer upper pressing plate, outer lower pressing plate, middle upper pressing plate, middle lower pressing plate, inner upper pressing plate, and inner lower pressing plate. The purpose is to ensure stable clamping of the workpiece to be processed between the outer upper pressing plate and the outer lower pressing plate, between the middle upper pressing plate and the middle lower pressing plate, and between the inner upper pressing plate and the inner lower pressing plate.
[0043] Reference Figure 1 , handles are provided on the non-clamping surfaces of the outer upper pressing plate, outer lower pressing plate, middle upper pressing plate, middle lower pressing plate, inner upper pressing plate, and inner lower pressing plate. The handles are for facilitating the removal of the corresponding pressing plates.
[0044] Reference Figure 1 , the handles are all provided at the four corner positions of the pressing plate where they are located.
[0045] Reference Figure 3 , the upper pressing plates of each layer, outer lower pressing plate, middle upper pressing plate, middle lower pressing plate, inner upper pressing plate, and inner lower pressing plate are all separately provided. The separately provided pressing plates can be disassembled along the direction of their respective planes, and can cause as little disturbance as possible to the workpiece to be processed.
[0046] A usage method of a multi-stage clamping device includes the following steps:
[0047] Fix the workpiece to be processed using the multi-stage clamping device;
[0048] Machine the part of the workpiece to be processed within the hollowed-out area in the middle of the inner clamping plate. After machining is completed, remove the inner clamping plate;
[0049] Machine the part of the workpiece to be processed within the hollowed-out area in the middle of the middle clamping plate. After machining is completed, remove the middle clamping plate;
[0050] Machine the part of the workpiece to be processed within the hollowed-out area in the middle of the middle clamping plate. After machining is completed, remove the middle clamping plate;
[0051] Machine the part of the workpiece to be processed within the hollowed-out area in the middle of the outer clamping plate. After machining is completed, remove the outer clamping plate to obtain the machined workpiece.
[0052] Furthermore, before machining the workpiece to be processed, create a machining program on the numerically controlled machine tool, including the following steps:
[0053] Establish a three-dimensional model of the target structure in the modeling module of UG, and the size of the model does not exceed the range of the outer clamping plate;
[0054] Create a ball-nose end mill in the machining module;
[0055] Create a geometry and set the coordinate axis center at the center position of the top layer of the model;
[0056] Create an operation, select Depth Profile Milling, select the previously created ball-nose end mill for the tool, specify the part, cutting area and trimming boundary; in the cutting parameters, select conventional milling and layer priority for the strategy, and select layer-to-layer along part cross diagonal plunge for the connection; for non-cutting moves, select plunge for the approach, and the retract is the same as the approach; select linear for the motion output type;
[0057] Generate the machining program, input the processed code into the CNC machine tool, and export the respective motion trajectories of the two tool heads.
[0058] Furthermore, lubricating oil is applied to both sides of the workpiece to be machined and the contact surface of the tool head before forming.
[0059] Adaptations made according to actual requirements are all within the scope of protection of the present invention.
[0060] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed by the invention. Any reference signs in the claims should not be construed as limiting the claimed invention.
Claims
1. A multi-stage clamping device, characterized in that: It comprises an outer layer plywood, a middle layer plywood and an inner layer plywood, all of which are hollowed out in the middle. The middle layer plywood is arranged in the hollowed out area in the middle of the outer layer plywood, and the inner layer plywood is arranged in the hollowed out area of the middle layer plywood. The clamping surfaces of the outer layer plywood, the middle layer plywood and the inner layer plywood are all provided with magnetic suction devices.
2. The multi-stage clamping device according to claim 1, characterized in that: The outer layer plywood includes an outer layer upper pressing plate and an outer layer lower pressing plate, the middle layer plywood includes a middle layer upper pressing plate and a middle layer lower pressing plate, and the inner layer plywood includes an inner layer upper pressing plate and an inner layer lower pressing plate.
3. The multi-stage clamping device according to claim 2, characterized in that: The outer layer upper pressing plate, the outer layer lower pressing plate, the middle layer upper pressing plate, the middle layer lower pressing plate, the inner layer upper pressing plate and the inner layer lower pressing plate are all square frames with hollowed-out middle portions.
4. The multi-stage clamping device according to claim 3, characterized in that: The magnetic attraction device is a magnet, and the magnet is arranged along the circumference of the square frame.
5. The multi-stage clamping device according to claim 3, characterized in that: The outer layer upper pressing plate, the outer layer lower pressing plate, the middle layer upper pressing plate, the middle layer lower pressing plate, the inner layer upper pressing plate and the non-clamping surface of the inner layer lower pressing plate are all provided with handles.
6. The multi-stage clamping device according to claim 5, characterized in that: The handles are arranged at the four corners of the pressing plate where they are located.
7. The multi-stage clamping device according to claim 3, characterized in that: The upper pressing plate of the outer layer, the lower pressing plate of the outer layer, the upper pressing plate of the middle layer, the lower pressing plate of the middle layer, the upper pressing plate of the inner layer and the lower pressing plate of the inner layer are all separately arranged.
8. A method for using a multi-stage clamping device, characterized in that: The multi-stage clamping device according to any one of claims 1 to 7 comprises the following steps: A multi-stage clamping device is used to fix the workpiece to be processed; Processing the part of the workpiece to be processed in the middle hollow area of the inner plywood, and after the processing is completed, removing the inner plywood; Processing the part of the workpiece to be processed in the middle hollow area of the middle layer plywood, and after the processing is completed, removing the middle layer plywood; Processing the part of the workpiece to be processed in the middle hollow area of the middle layer plywood, and after the processing is completed, removing the middle layer plywood; The part of the workpiece to be processed in the middle hollow area of the outer layer splint is processed. After the processing is completed, the outer layer splint is removed to obtain the processed workpiece.
9. A method for using a multi-stage clamping device according to claim 8, characterized in that: Before machining the workpiece, create a machining program on the CNC machine tool, including the following steps: A three-dimensional model of the target structure is established in the modeling module of UG, and the size of the model does not exceed the range of the outer splint; Create a ball end cutter in the machining module; Create the geometry and set the center of the coordinate axis to the center of the top layer of the model; Create a process, select deep contour milling, select the created ball end cutter as the tool, specify the part, cutting area and trimming boundary; select down milling and layer priority in the cutting parameters strategy, select layer to layer cross oblique feed along the part; select slotting in the non-cutting movement feed, and the retracting is the same as the feed; select straight line as the motion output type; Generate a machining program, input the processed code into the CNC machine tool, and derive the motion trajectories of the two tool heads.
10. A method for using a multi-stage clamping device according to claim 9, characterized in that: Before forming, lubricating oil is applied to both sides of the workpiece to be processed and the contact surface of the tool head.