Digital rapid clamping device capable of sensing mirror image milling force in multi-dimensional mode

Abstract

The invention belongs to the technical field of tool design, and particularly relates to a digital rapid clamping device capable of sensing mirror image milling force in a multi-dimensional mode. The device comprises a supporting frame and a plurality of clamping mechanisms fixed to the supporting frame. Each clamping mechanism comprises a first telescopic rod, a second telescopic rod and a chuck. One end of the first telescopic rod and one end of the second telescopic rod are hinged to two supporting points of the supporting frame through spherical hinges respectively, the other end of the first telescopic rod is hinged to the other end of the second telescopic rod, and the chuck is arranged on the front side of the end, hinged to the second telescopic rod, of the first telescopic rod. A three-axis sensor is arranged between the clamping mechanism and the hinged end, and the clamping heads of the clamping mechanisms are used for clamping the skin at multiple positions on the two sides of the skin. The clamping efficiency of mirror image milling of the large aircraft skin is improved.

Description

Technical Field

[0001] This application belongs to the technical field of tooling design, and particularly relates to a multi-dimensional perception mirror milling force digital quick clamping device. Background Art

[0002] Existing dual five-axis mirror milling equipment is mainly used for milling large complex curved surface parts such as aircraft skins, and is widely used in processes such as milling weight reduction, milling windowing, trimming, and drilling of large complex aircraft skin parts. During the mirror milling process of weakly rigid skin parts, the skin parts are extremely prone to chatter and deformation. Therefore, the mirror milling of large aircraft weakly rigid skin parts places strict requirements on the dynamic response and stiffness of the clamping system. At present, the clamping of skin parts in domestic and foreign mirror milling equipment mainly adopts a telescopic arm mechanism with multi-point clamping with the parts suspended around. For the complex skin parts of large aircraft, the clamping time of the entire skin is too long, seriously affecting the machining efficiency of aircraft skin mirror milling. At the same time, factors such as stress release, stress concentration, and mirror milling force changes during the machining process of skin parts are extremely likely to affect the machining accuracy of the parts. Summary of the Invention

[0003] In order to solve the above problems, this application provides a multi-dimensional perception mirror milling force digital quick clamping device, which mainly includes a support frame and a plurality of clamping mechanisms fixed on the support frame. Each clamping mechanism includes a first telescopic rod, a second telescopic rod, and a chuck. One end of the first telescopic rod and one end of the second telescopic rod are respectively hinged to two support points of the support frame through spherical hinges. The other end of the first telescopic rod and the other end of the second telescopic rod are hinged to each other. The chuck is arranged on the front side of the end where the first telescopic rod and the second telescopic rod are hinged to each other, and a triaxial sensor is arranged between the chuck and the hinged end. The chucks of each clamping mechanism are used to clamp the skin at multiple positions on both sides of the skin.

[0004] Preferably, the first telescopic rod and the second telescopic rod are telescopic rods of three or more levels. The adjacent levels of telescopic rods are locked through a cam shaft holding. A protective sleeve made of bellows is sleeved outside the telescopic rod.

[0005] Preferably, the triaxial sensor adopts a resistance strain type sensor.

[0006] Preferably, the chuck includes an arc seat, a clamping jaw, a push rod, and a locking nut. The arc seat has a first strip hole and a second strip hole on both sides along the circumferential direction. The clamping jaw is located inside the arc seat. The clamping jaw has a screw passing through the first strip hole. The screw is adaptively connected to the locking nut outside the arc seat. After the push rod passes through the second strip hole, it can press against the skin located inside the clamping jaw.

[0007] Preferably, the jaw has a slide bar passing through the second strip-shaped hole. The slide bar has a through hole with internal threads, and the through hole communicates with the inner side of the jaw. The push rod has external threads adapted to pass through the through hole.

[0008] Preferably, the jaw has a support frame passing through the arc-shaped seat. The support frame has a perforation, and the push rod passes through the perforation and is connected to a rocker arm. The rocker arm is hinged to the support frame.

[0009] This application improves the clamping efficiency of the mirror milling of large aircraft skins. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic structural diagram of a preferred embodiment of the multi-dimensional perception mirror milling force digital fast clamping device of this application.

[0011] Figure 2 is a schematic structural diagram of the clamping mechanism.

[0012] Figure 3 is a schematic structural diagram of the left side of the chuck of a preferred embodiment of this application.

[0013] Figure 4 is Figure 3 a schematic structural diagram of the right side of the chuck of the illustrated embodiment.

[0014] Figure 5 is a schematic structural diagram of the chuck of another preferred embodiment of this application.

[0015] Among them, 100 - clamping mechanism, 200 - support frame, 300 - skin, 1 - ball hinge, 2 - first telescopic rod, 3 - cam shaft holding, 4 - protective sleeve, 5 - three-axis sensor, 6 - chuck, 61 - arc-shaped seat, 611 - first strip-shaped hole, 612 - second strip-shaped hole, 62 - jaw, 621 - support frame, 63 - push rod, 631 - rocker arm, 64 - locking nut, 7 - second telescopic rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] To make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings in the embodiments of this application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some but not all of the embodiments of this application. The embodiments described below with reference to the drawings are exemplary and are intended to explain this application and should not be construed as limiting this application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the drawings.

[0017] The present application provides a multi-dimensional perception digital rapid clamping device for mirror milling force, as Figure 1 shown, mainly including a support frame 200 and a plurality of clamping mechanisms 100 fixed on the support frame 200. The skin 300 is clamped and fixed by the plurality of clamping mechanisms 100.

[0018] As Figure 2 shown, each clamping mechanism 100 includes a first telescopic rod 2, a second telescopic rod 7 and a chuck 6. One end of the first telescopic rod 2 and one end of the second telescopic rod 7 are respectively hinged to two support points of the support frame 200 through spherical hinges 1. The other end of the first telescopic rod 2 and the other end of the second telescopic rod 7 are hinged to each other. The chuck 6 is arranged on the front side of the hinged end where the first telescopic rod 2 and the second telescopic rod 7 are hinged to each other, and a three-axis sensor 5 is arranged between the chuck 6 and the hinged end. The chucks 6 of each clamping mechanism 100 are used to clamp the skin 300 at multiple positions on both sides of the skin 300.

[0019] The double-stage telescopic rod designed in the present application can realize the multi-degree-of-freedom precise positioning of the clamping end within the X-Y-Z three-dimensional space range, meeting the rapid clamping requirements of skin workpieces with different curvatures. During the skin processing, the three-axis sensor 5 can monitor the three-way dynamic components of the cutting force in real time, better realizing the optimization and adjustment of the processing parameters. This device effectively solves the problem of skin deformation caused by traditional rigid clamping. Through force-position collaborative control, the processing efficiency can be increased by more than 40%, significantly improving the processing quality and efficiency of aviation thin-walled parts.

[0020] The present application further includes a data acquisition module and a data display, recording and analysis system. The data acquisition module obtains the data information collected by the three-axis sensor in real time by setting a high-speed acquisition card and connecting the three-axis sensor through a flexible cable, and sends it to the data display, recording and analysis system for displaying the change process of the mirror milling force to guide the skin clamping. The data display, recording and analysis system is developed using C# language, including a data display function area, a data recording function area and a data analysis function area.

[0021] The steps of using the multi-dimensional perception digital rapid clamping device for mirror milling force of the present application and its supporting analysis system are as follows: Step S1: Initialize the clamping mechanism, that is, evenly distribute the clamping device along the edge of the skin at 150±5 mm intervals, and then establish a global coordinate system of the skin through a laser tracker.

[0022] Step S2: Adaptive clamping. First, perform pre-tightening force loading (the initial pressure is usually set to 50 N). After obtaining the stress data through the three-axis sensor and the data acquisition module, adjust the spatial position of the clamping point through the spherical hinge 1, the first telescopic rod 2 and the second telescopic rod 7.

[0023] Step S3: Clamp the skin 300 with the chuck 6, perform mirror milling on the skin 300, and monitor and record the data during the milling process in real time through the data display and recording analysis system.

[0024] In step S2, under the condition of no pressure, each sensor needs to be calibrated in advance. After the tooling is erected, observe the changes of each sensor, and the values of the sensors need to be adjusted within a reasonable range. After clamping the skin with the clamping device of the present application, the post-processing surface error of the skin is ≤0.05 mm, the accuracy is improved by 67%, and the clamping efficiency is increased by 40%.

[0025] In some alternative embodiments, the first telescopic rod 2 and the second telescopic rod 7 are telescopic rods with three or more stages. The adjacent stages of telescopic rods are locked by a cam shaft clamp 3, and a protective sleeve 4 made of bellows is sleeved outside the telescopic rod.

[0026] The telescopic rod of the present application is supported by a high-strength alloy material. By designing a three-stage telescopic mechanism, the clamping requirements during the milling process of skins of different model sizes are met. A long guiding mechanism is adopted inside the telescopic cylinder to further improve the strength of the telescopic mechanism when it is fully extended, so as to maintain sufficient rigidity. On the other hand, the present application enhances the surface anti-corrosion effect of the telescopic rod through the protective sleeve 4, and at the same time can improve the stability of the telescopic rod. The steps of clamping the skin with the clamping device of the present application are as follows: For aircraft skins of different model sizes, first, preliminarily adjust the telescopic position of the telescopic rod of the clamping device. Specifically, open the cam shaft clamp to ensure that the three-stage telescopic rod structure can extend and retract smoothly, and adjust the length of the three-stage telescopic rod so that the end chuck is at a suitable position on the edge of the skin to be clamped; then, control the end chuck to firmly clamp the edge position of the aircraft skin to achieve locking and fixing of the skin; finally, close the cam shaft clamp and press the telescopic rod to complete the clamping of the aircraft skin by the entire clamping device.

[0027] In some alternative embodiments, the triaxial sensor 5 adopts a resistance strain type sensor to be suitable for high-frequency acquisition of dynamic milling forces.

[0028] In some alternative embodiments, the chuck 6 includes an arc-shaped seat 61, a clamping jaw 62, a push rod 63 and a locking nut 64. The arc-shaped seat 61 has a first strip-shaped hole 611 and a second strip-shaped hole 612 on both sides along the circumference. The clamping jaw 62 is located inside the arc-shaped seat 61. The clamping jaw 62 has a screw rod passing through the first strip-shaped hole 611, and the screw rod is adaptively connected to the locking nut 64 outside the arc-shaped seat 61. After the push rod 63 passes through the second strip-shaped hole 612, it can press against the skin 300 located inside the clamping jaw 62.

[0029] In this embodiment, the first elongated hole 611 is provided on the arc-shaped seat 61, penetrating through the side wall of the arc-shaped seat 61. The screw passes through this hole and is connected to the jaw 62. In an alternative embodiment, the first elongated hole can also be provided on the jaw 62. Refer to Figure 4 , when it is provided on the arc-shaped seat 61, it is usually necessary to ensure that the outer wall of the arc-shaped seat 61 is an arc structure. When it is provided on the jaw 62, the outer wall of the arc-shaped seat 61 is not restricted, for example, it is a polygonal structure. The arc-shaped seat only needs to have a through hole penetrating the side wall for the screw to pass through.

[0030] In some alternative embodiments, the jaw 62 has a slide rod passing through the second elongated hole 612. The slide rod has a through hole with internal threads, and the through hole communicates with the inner side surface of the jaw 62. The push rod 63 has external threads adapted to pass through the through hole.

[0031] The above embodiment gives an implementation manner of the chuck, that is, the push rod 63 realizes forward and backward movement through a threaded drive method. Refer to Figure 3 and Figure 4 , the chuck 6 mainly includes an arc-shaped seat 61 and a jaw 62. The arc-shaped seat 61 provides a notch, and the notch is between 90° and 180°. The jaw 62 is installed in this notch and can rotate freely in this notch. The arc-shaped seat 61 has two elongated holes on both sides respectively. As Figure 3 shown, the second elongated hole 612 is on the left side of the arc-shaped seat 61, which is mainly used to install the push rod 63. After the push rod 63 passes through the jaw 62, it can press against the skin inside the jaw 62. In this embodiment, the push rod 63 is a screw with external threads. Correspondingly, the jaw 62 provides a through hole with internal threads, and the forward and backward movement of the push rod 63 in the through hole is realized by rotation. As Figure 4 shown, the first elongated hole 611 is on the right side of the arc-shaped seat 61, which is mainly used to install the screw and cooperate with the locking nut 64 to realize the rotation of the jaw 62. After tightening the locking nut 64, the jaw 62 is fixed in the arc-shaped seat 61. After loosening the locking nut 64, the jaw 62 can rotate freely in the arc-shaped seat 61, that is, tightening the locking nut 64 can lock the angle of the jaw 62, and loosening the locking nut 64 can adjust the angle of the jaw 62. In this embodiment, the rotation angle of the jaw 62 depends on the length of the first elongated hole.

[0032] In this embodiment, the jaw 62 is initially in a locked state and is locked in the notch of the arc-shaped seat 61 and cannot rotate. After adjusting the telescopic rod of the clamping device so that the jaw 62 at the end of the telescopic rod presses against the skin, rotate the push rod 63 to make it press against the skin inside the jaw 62, and then loosen the locking nut 64 to make the jaw 62 can rotate freely in the notch of the arc-shaped seat 61 to meet the on-site use requirements.

[0033] In some alternative embodiments, the jaw 62 has a support frame 621 passing through the arc-shaped seat 61. The support frame 621 has a perforation, and the push rod 63 passes through the perforation and then connects to the rocker arm 631, which is hinged to the support frame 621.

[0034] This embodiment provides another implementation of the chuck 6. The push rod 63 that originally moved in a threaded stepping manner is driven by the rocker arm 631. These two methods, the threaded push rod and the rocker arm push rod, exist independently. Refer to Figure 5 , a support frame 621 is provided. One end of the support frame 621 is connected to the jaw 62 through two connecting rods. The other end of the support frame 621 is in a cylindrical structure with a perforation through which the push rod 63 can pass. After the push rod 63 further passes through the jaw 62, its end extends into the jaw 62 to provide a pushing force against the skin. The other end of the push rod 63 is hinged with a right-angled rocker arm 631. Both sides of the rocker arm 631 are respectively hinged to the cylindrical structure through a connecting rod. By rotating the rocker arm 631, the push-pull of the push rod 63 is realized. Figure 5 The clamping state where the push rod 63 extends into the jaw 62 is shown. After rotating the rocker arm 631 downward, the push rod 63 is pulled back, converting the push rod 63 from the clamping state to the relaxed state. This embodiment realizes the fast clamping function of the jaw.

[0035] As described above, the above are only specific embodiments 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 those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A digital quick clamping device for multi-dimensional perception mirror milling force, characterized in that It includes a support frame (200) and a plurality of clamping mechanisms (100) fixed on the support frame (200). Each clamping mechanism (100) includes a first telescopic rod (2), a second telescopic rod (7) and a chuck (6). One end of the first telescopic rod (2) and one end of the second telescopic rod (7) are respectively hinged to two support points of the support frame (200) through spherical hinges (1). The other end of the first telescopic rod (2) and the other end of the second telescopic rod (7) are hinged to each other. The chuck (6) is arranged on the front side of the hinged end of the first telescopic rod (2) and the second telescopic rod (7), and a three-axis sensor (5) is arranged between the chuck (6) and the hinged end. The chucks (6) of each clamping mechanism (100) are used to clamp the skin (300) at multiple positions on both sides of the skin (300).

2. The multi-dimensional perception mirror milling force digital quick clamping device according to claim 1, characterized in that, The first telescopic rod (2) and the second telescopic rod (7) are telescopic rods with three or more stages. The adjacent stages of telescopic rods are locked through a cam shaft clamp (3). A protective sleeve (4) made of bellows is sleeved outside the telescopic rod.

3. The multi-dimensional perception mirror milling force digital quick clamping device according to claim 1, characterized in that, The three-axis sensor (5) adopts a resistance strain type sensor.

4. The multi-dimensional perception mirror milling force digital quick clamping device according to claim 1, characterized in that, The chuck (6) includes an arc-shaped seat (61), a clamping jaw (62), a push rod (63) and a locking nut (64). The two sides of the arc-shaped seat (61) along the circumferential direction have a first strip hole (611) and a second strip hole (612). The clamping jaw (62) is located inside the arc-shaped seat (61). The clamping jaw (62) has a screw rod passing through the first strip hole (611), and the screw rod is adaptively connected with the locking nut (64) outside the arc-shaped seat (61). After the push rod (63) passes through the second strip hole (612), it can press against the skin (300) located inside the clamping jaw (62).

5. The multi-dimensional perception mirror milling force digital quick clamping device according to claim 4, characterized in that, The clamping jaw (62) has a sliding rod passing through the second strip hole (612). The sliding rod has a through hole with internal threads, and the through hole communicates with the inner side surface of the clamping jaw (62). The push rod (63) has external threads adapted to pass through the through hole.

6. The multi-dimensional perception mirror milling force digital quick clamping device according to claim 4, characterized in that The clamping jaw (62) has a support frame (621) passing through the arc-shaped seat (61). The support frame (621) has a through hole. After the push rod (63) passes through the through hole, it is connected to a rocker arm (631), and the rocker arm (631) is hinged to the support frame (621).

Images