Mirror image milling clamp suitable for thin-wall components with different curvatures

Abstract

The mirror image milling clamp comprises two clamping devices, each clamping device comprises at least one clamping mechanism, and each clamping mechanism comprises a connecting base which is in a long-strip box shape, the front surface of the connecting base is open, the left end and the right end of the connecting base are open, and a containing groove is formed; a left support and a right support are arranged in the containing groove. Grooves are formed in the centers of the upper and lower side plates of the connecting seat and used for extending the edge of the thin-wall component; the two-way screw rod is erected on the left bracket and the right bracket; the screw rod comprises two thread areas on the left side, two thread areas on the right side and a middle polish rod area. The thread feeding directions of the two thread areas on the left side and the two thread areas on the right side are opposite; an adjusting groove hole is formed in at least one end face of the two-way screw rod; the two chucks are partially or completely located in the containing groove, and the chucks and the connecting base are in sliding key and sliding groove fit; the two chucks are in contact with the left half part and the right half part of the two-way screw respectively; the contact face of the chuck and the two-way screw is in a concave arc shape, and threads are arranged on the contact face.

Description

Technical Field

[0001] The invention belongs to the field of mirror milling processing of complex thin-walled components, and in particular relates to a mirror milling fixture suitable for thin-walled components with different curvatures. Background Art

[0002] Large thin-walled components are widely used in the aerospace field. For example, they are used to manufacture aircraft skins and rocket cabins. They are key components in major national products such as heavy-load rockets and large aircraft. However, due to the large size, low rigidity, high material removal ratio, and poor processing stability of such parts, the manufacturing difficulty is increased. Under the combined effects of cutting force / heat, residual stress, and clamping force, structural deformation, flutter, or instability are very likely to occur. The traditional method of removing materials from large thin-walled parts is through chemical processing. The disadvantages of this method are that it is easy to produce chemical pollution, has a long production cycle, and cannot be recycled. Mirror milling is a new thin-walled component processing technology. By arranging milling and support devices on both sides of the workpiece, synchronous processing is achieved, which effectively improves processing accuracy and efficiency.

[0003] The mirror milling fixture is an essential component of the mirror milling system. Unlike the fixed design of traditional machine tool fixtures, the mirror milling fixture must adapt to the processing requirements of complex curved workpieces and require sufficient space in front and behind the workpiece to prevent interference with the milling and support devices.

[0004] Chinese patent 201910068893.6 discloses a fixture suitable for mirror milling of curved thin plate parts, including a base, a positioning base plate, a bottom positioning block, a column, an upper clamping mechanism, a middle clamping mechanism, and a lower clamping mechanism; the column is fixed in the base through the positioning base plate to constrain the movement of the column along the axis; the bottom positioning block is connected to the lower outer side of the column to constrain the rotation of the column around the axis; the upper clamping mechanism, the middle clamping mechanism and the lower clamping mechanism are respectively connected to the upper, middle and lower parts of the column, and can slide along the column to clamp the boundary position of the curved thin plate parts.

[0005] The aforementioned clamps clamp thin-walled components by tightening screws in the clamping mechanism, which is time-consuming and prevents rapid clamping. To clamp thin-walled components with varying curvatures, the aforementioned clamps rely on different tooth grooves to achieve column rotation, limiting rotation to a specific range of angles and limiting their universal applicability to workpieces of varying curvatures.

[0006] Therefore, providing a mirror milling fixture that is suitable for thin-walled curved components of different sizes and curvatures and can achieve rapid clamping has become a problem that needs to be solved in the industry. Summary of the Invention

[0007] In order to solve the deficiencies in the prior art, the main purpose of the present invention is to provide a mirror milling fixture, which is suitable for thin-walled curved components of different sizes and curvatures and can achieve rapid clamping of thin-walled components.

[0008] In order to achieve the above main objectives, the present invention discloses a mirror milling fixture suitable for thin-walled components with different curvatures, which includes two clamping devices arranged in pairs, each clamping device includes at least one clamping mechanism, and each clamping mechanism includes:

[0009] The connecting seat is in the shape of a long box, with an open front surface and two openings on both sides, forming a receiving groove; a left bracket and a right bracket are arranged in the receiving groove; a U-shaped groove is provided in the center of the upper and lower side plates of the connecting seat for the edge of the thin-walled component to extend into;

[0010] A bidirectional screw with positive and negative threads is mounted on a left bracket and a right bracket; it includes two threaded areas on the left, two threaded areas on the right, and a polished rod area in the middle; a left polished rod area is provided between the two threaded areas on the left for mating with the left bracket; a right polished rod area is provided between the two threaded areas on the right for mating with the right bracket; the threaded areas are thicker than the polished rod area; the thread feed directions of the two threaded areas on the left and the two threaded areas on the right are opposite; an adjustment slot is provided on at least one end surface of the bidirectional screw;

[0011] There are two chucks, part or all of which are located in the accommodating groove, and the chucks and the connecting seat are matched with a sliding key groove; the two chucks contact the left and right halves of the bidirectional screw respectively; the contact surface of the chuck with the bidirectional screw is an inward concave arc, and the contact surface is provided with a thread that matches the bidirectional screw; the edge of the thin-walled component is clamped between the two chucks.

[0012] The clamping mechanism of this invention is a centrifugal clamping mechanism. The clamping mechanisms are symmetrically arranged on the left and right sides of the workpiece (thin-walled component). Two chucks are located on the front and back surfaces of the workpiece, each with threads that mate with a screw. A bidirectional screw with forward and reverse threads transmits motion, allowing centrifugal movement of the two chucks simply by turning the screw on one side.

[0013] According to one embodiment of the present invention, the clamping device further includes a column having a vertical slot; the clamping mechanism further includes a vertical slider that slides within the vertical slot and is fixedly connected to the vertical slider by a rear surface of the connecting seat (e.g., via bolts); after the vertical slider slides into position, it is fixed in place by bolts. Two columns are disposed on the left and right sides of the thin-walled component, and the clamping mechanism can be freely arranged along the axis of the columns and can also be freely moved along the vertical slots within the columns to accommodate thin-walled components of different sizes.

[0014] According to a specific embodiment of the present invention, 3-5 clamping mechanisms are provided on the column.

[0015] According to a specific embodiment of the present invention, the clamping device further includes a column base, and the column is fixedly arranged on the column base.

[0016] According to a specific embodiment of the present invention, the column base is a rotary base, which includes:

[0017] The rotating platform includes a disc and a rotating shaft, wherein the rotating shaft is fixedly connected to the lower surface of the disc, and the column is fixedly arranged on the upper surface of the disc;

[0018] The fixed platform is located below the rotating platform and includes a fixed plate and a cylindrical wall located on the fixed plate. A stepped circular hole is provided in the center of the fixed plate in the cylindrical wall for accommodating the bottom end of the rotating shaft. The top end of the cylindrical wall supports the circular disc. A circular hole is provided on the side of the cylindrical wall.

[0019] The worm gear mechanism is located inside the cylinder wall and includes a transmission worm wheel and a transmission worm; the transmission worm wheel is sleeved on the rotating shaft and fixedly connected to the rotating shaft; the two ends of the transmission worm are respectively a meshing end and a connecting end;

[0020] The handwheel comprises a turntable, and a handle is provided at a non-center position outside the turntable; the handwheel is located outside the cylinder wall, and the inner side of the turntable is fixedly connected to the connecting end of the transmission worm through a circular hole.

[0021] A rotating base, located beneath the column, drives both rotation and translation, enhancing the fixture's adaptability for workpieces of varying curvatures and sizes. A handwheel drives a worm gear within the fixed platform, which in turn drives a mating worm wheel. This rotation of the worm wheel drives the shaft, which in turn rotates the rotating platform and the entire column, adapting to thin-walled components of varying curvatures. Due to the self-locking nature of the worm gear, adjusting the handwheel to the desired angle locks the worm wheel, thereby fixing the column's rotation angle.

[0022] According to a specific embodiment of the present invention, the apparatus further comprises a base having a horizontal slide groove formed therein; the column base further comprises a horizontal slider, a fixing plate fixedly connected to the horizontal slider (e.g., by bolts), and the horizontal slider slidingly disposed within the horizontal slide groove; after the horizontal slider slides into position, it is fixed in place by bolts. The rotatable base is fixedly connected to the horizontal slider and can freely move along the horizontal slide groove of the base to accommodate workpieces of different sizes.

[0023] According to a specific embodiment of the present invention, there are two bases, and the two clamping devices are respectively arranged on the two bases.

[0024] According to a specific embodiment of the present invention, there is only one base, and both clamping devices are arranged on the base.

[0025] According to a specific embodiment of the present invention, the chuck is made of aluminum alloy, and the hardness of the material is lower than that of the workpiece to be processed, so it will not damage the surface of the workpiece.

[0026] According to a specific embodiment of the present invention, the adjustment slot is a square slot, a cross slot or a straight slot.

[0027] The present invention has the following beneficial effects:

[0028] The mirror milling fixture of the present invention can realize fast clamping of workpieces through a centering clamping mechanism. By adjusting the position of the clamping mechanism and the rotation angle of the rotary base, it can adapt to the clamping of thin-walled components of different sizes and curvatures.

[0029] In order to more clearly illustrate the purpose, technical solutions and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 1 is a schematic diagram of the overall structure and usage status of the mirror milling fixture of Example 1;

[0031] Figure 2 is an exploded view of the clamping device in Example 1;

[0032] Figure 3 1 is a schematic diagram of the overall structure of the column base in Example 1;

[0033] Figure 4 This is an exploded view of the column base in Example 1;

[0034] Figure 5 1 is a schematic diagram of the overall structure of the clamping mechanism in Example 1;

[0035] Figure 6 is an exploded view of the clamping mechanism in Example 1;

[0036] Figure 7 is another exploded view of the clamping mechanism in Example 1;

[0037] Figure 8 This is a diagram showing the matching relationship between the chuck and the bidirectional screw in Example 1. DETAILED DESCRIPTION

[0038] In the following description, many specific details are set forth in conjunction with the embodiments to facilitate a full understanding of the present invention. However, it should be understood that the following embodiments and detailed descriptions are only for illustrative purposes and do not limit the scope of protection of the present invention.

[0039] Example 1

[0040] like Figure 1As shown, this embodiment provides a mirror milling fixture suitable for thin-walled components with different curvatures, which includes two bases 1 and two clamping devices 2 arranged in pairs. The bases are provided with horizontal slides 101. The two clamping devices 2 are respectively arranged on the two bases.

[0041] like Figure 2 As shown, each clamping device 2 includes a column base 3, a column 4, and three clamping mechanisms 5. The three clamping mechanisms 5 are respectively arranged at the upper, middle and lower parts of the column 4 and can slide along the column 4.

[0042] like Figure 3-Figure 4 As shown, the column base 3 is a rotating base, comprising a horizontal slider 31, a rotating platform 32, a fixed platform 33, a worm gear mechanism 34, and a handwheel 35. The horizontal slider 31 slides within the horizontal chute 101. The rotating platform comprises a disc 321 and a rotating shaft 322, which is fixedly connected to the lower surface of the disc 321. The fixed platform 33 is located below the rotating platform 32 and comprises a fixed plate 331 and a cylindrical wall 332 located above the fixed plate 331. The fixed plate 331 is fixedly connected to the horizontal slider 31 via bolts. Once the horizontal slider 31 slides into position, it is secured in place with bolts. A stepped circular hole 333 is centrally located within the fixed plate within the cylindrical wall 332 to accommodate the bottom end of the rotating shaft. The top end of the cylindrical wall 332 supports the disc 321. A circular hole 334 is provided on the side of the cylindrical wall 331. The worm gear mechanism 34 is located within the cylindrical wall 332 and comprises a transmission worm wheel 341 and a transmission worm 342. The transmission worm wheel 341 is sleeved on the rotating shaft 322 and fixedly connected to the rotating shaft 322; the two ends of the transmission worm 342 are respectively a meshing end 343 and a connecting end 344; the handwheel 35 includes a turntable 351, and a handle 352 is provided at a non-center position on the outside of the turntable 351; the handwheel 35 is located outside the cylinder wall 332, and the inner side of the turntable 351 is fixedly connected to the connecting end 344 of the transmission worm 342 through a circular hole 334.

[0043] The column 4 is fixedly mounted on the upper surface of the disc 321 , and is provided with a vertical sliding groove 41 .

[0044] like Figure 5-Figure 8As shown, each clamping mechanism 5 includes a vertical slider 51, a connecting seat 52, a bidirectional screw 53, and two clamps 54. The vertical slider 51 is slidably arranged in the vertical slide 41. The connecting seat 52 is in the shape of an elongated box, and the rear surface of the connecting seat 52 is fixedly connected to the vertical slider 51 by bolts; after the vertical slider 51 slides into place, it is fixed in position by bolts. The front surface of the connecting seat 52 is open, and the left and right ends are open, forming a receiving groove 521; a left bracket 522 and a right bracket 523 are provided in the receiving groove 521; a U-shaped groove 524 is provided in the center of the upper and lower side panels of the connecting seat 52 for the edge of the thin-walled component A to extend into. The bidirectional screw 53 is a bidirectional screw with positive and negative threads, which is mounted on the left bracket 522 and the right bracket 523; it includes two threaded areas 531 on the left, two threaded areas 532 on the right, and a middle polished rod area 533; a left polished rod area 534 is provided between the two threaded areas 531 on the left, for cooperating with the left bracket 522; a right polished rod area 535 is provided between the two threaded areas 532 on the right, for cooperating with the right bracket 523; the threaded area is thicker than the polished rod area; the thread feed directions of the two threaded areas 531 on the left and the two threaded areas 532 on the right are opposite; and adjustment slots (such as square slots 536) are provided on both end faces of the bidirectional screw.

[0045] The majority of the chuck 54 is located within the receiving groove 521. A key-slide groove mates with the connector 52. The upper and lower sidewalls of the receiving groove 521 are provided with keyways 525, while the upper and lower sidewalls of the chuck 54 are provided with corresponding slide grooves 541. The two chucks 54 contact the left and right halves of the bidirectional screw 53, respectively. The contact surfaces 542 of the chucks 54 that mate with the bidirectional screw 53 are concave arcs and feature threads that mate with the bidirectional screw 53. The edge of the thin-walled component A is clamped between the two chucks 54. The chucks 54 are made of aluminum alloy.

[0046] Example 2

[0047] The difference between this embodiment and embodiment 1 is that there is only one base and both clamping devices are provided on the base.

[0048] Although the present invention has been described above through embodiments, the above embodiments are only used to exemplify the possible implementation schemes of the present invention and are not used to limit the scope of protection of the present invention. Any equivalent substitutions or changes made by those skilled in the art in accordance with the present invention should also be covered by the scope of protection defined by the claims of the present invention.

Claims

1. A mirror milling fixture suitable for thin-walled components with different curvatures, characterized by: The mirror milling fixture includes two clamping devices arranged in pairs, each of the clamping devices includes at least one clamping mechanism, and each of the clamping mechanisms includes: The connecting seat is in the shape of an elongated box, with an open front surface and openings at both ends to form a receiving groove; a left bracket and a right bracket are provided in the receiving groove; a U-shaped groove is provided in the center of the upper and lower side plates of the connecting seat for the edge of the thin-walled component to extend into; A bidirectional screw having positive and negative threads is mounted on the left bracket and the right bracket; it includes two threaded areas on the left side, two threaded areas on the right side, and a polished rod area in the middle; a left polished rod area is provided between the two threaded areas on the left side for mating with the left bracket; a right polished rod area is provided between the two threaded areas on the right side for mating with the right bracket; the threaded area is thicker than the polished rod area; the thread feed directions of the two threaded areas on the left side and the two threaded areas on the right side are opposite; an adjustment slot is provided on at least one end surface of the bidirectional screw; Two chucks, part or all of which are located in the accommodating groove, and the chucks and the connecting seat are matched with a sliding key and a sliding groove; the two chucks contact the left half and the right half of the bidirectional screw respectively; the contact surface of the chuck with the bidirectional screw is an inwardly concave arc, and the contact surface is provided with a thread that matches the bidirectional screw; the edge of the thin-walled component is clamped between the two chucks.

2. The mirror milling fixture according to claim 1, characterized in that The clamping device further includes a column, which is provided with a vertical slide groove; the clamping mechanism further includes a vertical slider, which is slidably set in the vertical slide groove, and the rear surface of the connecting seat is fixedly connected to the vertical slider; after the vertical slider slides into place, the position is fixed by bolts.

3. The mirror milling fixture according to claim 2, characterized in that The column is provided with 3-5 clamping mechanisms.

4. The mirror milling fixture according to claim 2, characterized in that: The clamping device further includes a column base, and the column is fixedly arranged on the column base.

5. The mirror milling fixture according to claim 4, characterized in that: The column base is a rotary base, which includes: A rotating platform comprising a disc and a rotating shaft, wherein the rotating shaft is fixedly connected to the lower surface of the disc, and the column is fixedly arranged on the upper surface of the disc; A fixed platform is located below the rotating platform, comprising a fixed plate and a cylindrical wall located on the fixed plate. A stepped circular hole for accommodating the bottom end of the rotating shaft is provided in the center of the fixed plate within the cylindrical wall, and the top end of the cylindrical wall supports the disc. A circular hole is provided on the side of the cylindrical wall. A worm gear mechanism is located inside the cylinder wall and includes a transmission worm wheel and a transmission worm; the transmission worm wheel is sleeved on the rotating shaft and fixedly connected to the rotating shaft; the two ends of the transmission worm are respectively a meshing end and a connecting end; The handwheel comprises a turntable, wherein a handle is provided at a non-center position on the outside of the turntable; the handwheel is located outside the cylinder wall, and the inner side of the turntable is fixedly connected to the connecting end of the transmission worm through the circular hole.

6. The mirror milling fixture according to claim 5, characterized in that: It further includes a base, on which a horizontal slide groove is provided; the column base further includes a horizontal slider, on which the rotating platform is provided, and the horizontal slider is slidably provided in the horizontal slide groove; after the horizontal slider slides into place, it is fixed in position by bolts.

7. The mirror milling fixture according to claim 6, characterized in that: There are two bases, and the two clamping devices are respectively arranged on the two bases.

8. The mirror milling fixture according to claim 6, characterized in that There is one base, and both clamping devices are arranged on the base.

9. The mirror milling fixture according to claim 1, characterized in that: The chuck is made of aluminum alloy.

10. The mirror milling fixture according to claim 1, characterized in that The adjustment slot is a square slot, a cross slot or a straight slot.

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