A precision spiral milling device for aerospace

Abstract

The present invention relates to the technical field of cutting processing equipment, and discloses an aerospace precision spiral milling device, comprising a spiral drive base, an eccentric rotating cylinder, a motor, a limit plate and a mounting cylinder, wherein the motor can drive the mounting cylinder to rotate; the front end of the mounting cylinder is connected to a first clamping assembly for clamping the middle section of the milling cutter, the interior of the mounting cylinder is slidably connected to a second clamping assembly for clamping the end portion of the milling cutter, the outer side of the mounting cylinder is sleeved with a first screw sleeve and a second screw sleeve, and the first screw sleeve and the second screw sleeve cooperate to enable the second clamping assembly to clamp the milling cutter. The present invention is provided with a first clamping assembly and a second clamping assembly, the first clamping assembly is used to clamp the middle portion of the milling cutter, and the second clamping assembly is used to clamp the end portion of the milling cutter, thereby forming two clamping areas on the milling cutter, increasing the area for clamping the milling cutter, and the clamping areas are distributed in the middle portion and the end portion of the milling cutter, effectively improving the stability of the front end of the milling cutter during cutting.

Description

Technical Field

[0001] The present invention relates to the technical field of cutting processing equipment, in particular to an aerospace precision spiral milling device. Background Art

[0002] In the manufacturing of aerospace parts, a large number of difficult-to-process materials such as titanium alloys, carbon fiber reinforced composites, and high-strength aviation aluminum alloys are used. These materials have poor machinability and require a large number of holes of different sizes to be drilled in the structure. If traditional drilling technology is used, many processes such as reaming, reaming, countersinking, and deburring are required after drilling. Therefore, a large number of processing tools of different sizes are needed.

[0003] Spiral milling technology is one of the effective technologies to solve the defects of traditional hole-making processes. The principle is to use the milling cutter to rotate and revolve, while feeding along the axial direction to achieve spiral planetary motion, thereby processing holes of different diameters. The axial force of the milling cutter in this processing method is small, so that materials such as carbon fiber are not layered. Therefore, burrs are not easy to generate at the inlet and outlet, chip removal is easy, and the heat generation is small, which will not burn the hole wall.

[0004] In the prior art, for example, the patent document with publication number CN101633060B discloses an automatic spiral milling unit, which includes a tool rotation system, a radial offset system, and a revolution system. It also includes a sleeve with an inner hole, which utilizes a method of adjusting the eccentricity of two eccentric sleeves; the patent proposes a method for realizing a spiral motion of the milling cutter during feed cutting.

[0005] However, the above-mentioned existing technical solutions still have limitations in actual use. Although the above-mentioned technical solutions are mainly used to achieve the spiral feed cutting effect of the milling cutter, in the process of actual spiral feed cutting of aerospace materials by the tool, the axial force applied to the milling cutter is relatively small but it will be subjected to a certain lateral force. If a conventional tool holder for clamping the milling cutter is used, the clamping area of the milling cutter may be small and the clamping area is single, resulting in insufficient stability of the milling cutter when subjected to lateral force, causing shaking, thereby reducing the accuracy of the cutting process. Summary of the Invention

[0006] The object of the present invention is to provide an aerospace precision spiral milling device to solve the problems in the prior art of a small clamping milling cutter area and low stability of a single clamping area.

[0007] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0008] A precision spiral milling device for aerospace, comprising a spiral drive base, an eccentric rotating drum being rotatably connected to the interior of the spiral drive base, a motor being installed on the inner side of the eccentric rotating drum, a central axis of the eccentric rotating drum being parallel to the central axis of the spiral drive base and having an adjustable spacing, the spiral drive base being capable of driving the eccentric rotating drum so that the eccentric rotating drum performs planetary motion around the central axis of the spiral drive base, a limiting disk being provided at one end of the eccentric rotating drum, a mounting drum being rotatably connected to the limiting disk for transmission with the output end of the motor, the central axes of the eccentric rotating drum, the limiting disk, the mounting drum and the motor being coincident, and the motor being capable of driving the mounting drum to rotate;

[0009] The front end of the mounting tube is connected to a first clamping assembly for clamping the middle section of the milling cutter, and the interior of the mounting tube is slidably connected to a second clamping assembly for clamping the end section of the milling cutter. The outer side of the mounting tube is sleeved with a first screw sleeve and a second screw sleeve. The first screw sleeve and the second screw sleeve cooperate to enable the second clamping assembly to clamp the milling cutter, and both the first screw sleeve and the second screw sleeve can adjust their positions on the mounting tube.

[0010] As a preferred solution of the present invention, the rear end of the mounting tube is provided with a transmission clamping hole for engaging with the output end of the motor, the front end of the mounting tube is provided with a first tube clamping groove, the interior of the mounting tube is provided with a first sliding cavity that coincides with the central axis of the mounting tube, a milling cutter channel for communication is provided between the first sliding cavity and the first tube clamping groove, the mounting tube is provided with a plurality of through sliding grooves distributed along the length direction of the mounting tube, and the outer circumferential surface of the mounting tube is provided with an external thread.

[0011] As a preferred embodiment of the present invention, the first clamping assembly includes a first elastic collet and a pressing cylinder, the first elastic collet can be placed in the first collet pressing groove, the pressing cylinder can be sleeved with the thread of the front end of the mounting cylinder, and the pressing cylinder can jointly squeeze the first elastic collet with the first collet pressing groove so that the first elastic collet clamps the milling cutter;

[0012] The first elastic collet comprises a first front section and a first rear section, and the outer sides of the first front section and the first rear section are both conical surfaces;

[0013] A second through hole is provided in the center of the pressing cylinder, and a second cylinder clamping groove matching the shape of the first front section is provided on one side of the pressing cylinder close to the mounting cylinder. The inner wall shape of the first cylinder clamping groove matches the shape of the first rear section.

[0014] As a preferred solution of the present invention, the outer circumferential surface at the connection point of the first front section and the first rear section is recessed to form a first annular groove, an axial first through hole penetrating the first front section and the first rear section is provided at the center of the first elastic collet, a plurality of first grooves and a second groove are provided on the side wall of the first elastic collet, the plurality of first grooves and the plurality of second grooves are staggered one by one, the plurality of first grooves and the plurality of second grooves all extend along the axial direction of the first elastic collet, the plurality of first grooves all penetrate the side wall of the first front section, and the plurality of second grooves all penetrate the side wall of the first rear section.

[0015] As a preferred embodiment of the present invention, the second clamping assembly includes a first pressing slide, a second elastic collet, and a second pressing slide slidably connected within the first sliding cavity, the second elastic collet being located between the first pressing slide and the second pressing slide and used to clamp the milling cutter, the second elastic collet including a second front section and a second rear section, the outer sides of the second front section and the second rear section both having conical surfaces;

[0016] A third collet pressing groove is formed on one end of the first pressing slide block close to the second elastic collet, and the inner wall shape of the third collet pressing groove matches the outer shape of the second front section. A fourth collet pressing groove is formed on one end of the second pressing slide block close to the second elastic collet, and the inner wall shape of the fourth collet pressing groove matches the outer shape of the second rear section.

[0017] A through hole is formed in the center of each of the first pressing slide block, the second elastic collet and the second pressing slide block.

[0018] As a preferred embodiment of the present invention, a second annular groove is formed at the connection point of the second front section and the second rear section, and a plurality of third grooves and a plurality of fourth grooves are provided on the side wall of the second elastic collet, and the plurality of third grooves and the plurality of fourth grooves are staggered one by one, and the plurality of third grooves and the plurality of fourth grooves extend along the axial direction of the second elastic collet, and the plurality of third grooves all penetrate the side wall of the second front section, and the plurality of fourth grooves all penetrate the side wall of the second rear section.

[0019] As a preferred solution of the present invention, a plurality of second sliding cavities distributed along the length direction of the mounting tube are opened on the inner wall of the third barrel clamp pressure groove, and each second sliding cavity is slidably connected with a cavity slider, and each second sliding cavity is provided with a spring for elastically supporting the cavity slider, and each cavity slider is provided with a connecting rod passing through the first pressure slider and connected to the second elastic barrel clamp.

[0020] As a preferred solution of the present invention, a plurality of third sliding cavities are provided inside the second pressure sliding block, distributed along the length direction of the mounting cylinder, each of the third sliding cavities is provided with an outer sliding groove extending to the outside of the second pressure sliding block, the length of the third sliding cavity is greater than the length of the corresponding outer sliding groove, and each of the third sliding cavities is slidably connected with a cavity sliding plug, the length of the cavity sliding plug is greater than the length of the corresponding outer sliding groove, and hydraulic oil is filled between the cavity sliding plug and the corresponding third sliding cavity.

[0021] As a preferred solution of the present invention, the first screw sleeve is connected to the outer side of the mounting tube through a threaded sleeve, and a first inner annular sliding groove surrounding the inner circumferential surface of the first screw sleeve is opened on the inner side of the first screw sleeve, and a plurality of first inner sliding blocks are slidingly connected in the first inner annular sliding groove, and the plurality of first inner sliding blocks are slidingly connected in the plurality of through sliding grooves in a one-to-one correspondence, and the ends of the plurality of first inner sliding blocks are fixedly connected to the first pressure sliding block, and the outer side of the first screw sleeve is a polygonal structure.

[0022] As a preferred solution of the present invention, the second screw sleeve is connected to the outer side of the mounting tube by a threaded sleeve, and a second inner annular sliding groove surrounding the inner circumferential surface of the second screw sleeve is opened on the inner side of the second screw sleeve, and a plurality of second inner sliding blocks are slidably connected in the second inner annular sliding groove, and the plurality of second inner sliding blocks are slidably connected in the plurality of through sliding grooves and the plurality of outer sliding grooves in a one-to-one manner, and the ends of the plurality of second inner sliding blocks are connected to the plurality of outer sliding grooves in a one-to-one manner, and the outer side of the second screw sleeve is a polygonal structure.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The present invention provides a first clamping assembly with a fixed position and a second clamping assembly with an adjustable position. The first clamping assembly is used to clamp the middle part of the milling cutter, and the second clamping assembly is used to clamp the end part of the milling cutter, thereby forming two clamping areas on the milling cutter. The two clamping mechanisms increase the area for clamping the milling cutter, and the clamping areas are distributed in the middle part and the end of the milling cutter, which effectively improves the stability of the front end of the milling cutter during cutting, thereby further improving the processing accuracy of the milling cutter.

[0025] (2) The distance between the second clamping assembly and the first clamping assembly of the present invention is adjustable, thereby ensuring that the second clamping assembly can always be clamped at the end of the milling cutter. Therefore, it can be applied to milling cutters of different lengths and sizes, thereby improving the applicability of the device.

[0026] (3) The present invention limits the position of the second elastic collet so that the central axes of the second elastic collet and the first elastic collet always coincide with each other, thereby facilitating the installation and removal of the milling cutter.

[0027] (4) The present invention designs a second pressing slider for pressing the second elastic collet. When the second screw sleeve is used to control the second pressing slider to squeeze the second elastic collet, the second pressing slider can be elastically pressed on the second elastic collet, thereby improving the stability of the second elastic collet in clamping the milling cutter. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0029] Figure 1 It is a schematic structural diagram of the overall device of the present invention.

[0030] Figure 2 It is a partial cross-sectional view of the device of the present invention.

[0031] Figure 3 This is a schematic diagram of the internal connections of the mounting tube of the present invention.

[0032] Figure 4 2 is a cross-sectional view of the first clamping assembly of the present invention.

[0033] Figure 5 2 is a cross-sectional view of the second clamping assembly of the present invention.

[0034] Figure 6 It is a three-dimensional partial cross-sectional view of the first pressing slider of the present invention.

[0035] Figure 7 It is a three-dimensional partial cross-sectional view of the second pressing slider of the present invention.

[0036] Reference numerals:

[0037] 1. Screw drive base; 2. Eccentric rotating drum; 3. Motor; 4. Mounting drum; 5. First clamping assembly; 6. Second clamping assembly; 7. First screw sleeve; 8. Second screw sleeve; 9. Limit plate;

[0038] 41. Transmission clamp hole; 42. First collet pressing groove; 43. First slide cavity; 44. Milling cutter channel; 45. Through slide groove;

[0039] 51. First elastic collet; 52. Pressing cylinder;

[0040] 511, first front section; 512, first rear section; 513, first annular groove; 514, first groove; 515, second groove; 521, second through hole; 522, second collet pressing groove;

[0041] 61. First pressing slide; 62. Second elastic collet; 63. Second pressing slide;

[0042] 611, third collet pressing groove; 612, second sliding cavity; 613, cavity slider; 614, spring; 615, connecting rod; 621, second front section; 622, second rear section; 623, second annular groove; 624, third groove; 625, fourth groove; 631, fourth collet pressing groove; 632, third sliding cavity; 633, outer sliding groove; 634, cavity slider;

[0043] 71. First inner annular chute; 72. First inner slider;

[0044] 81. Second inner annular slide groove; 82. Second inner slide block. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0046] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention.

[0047] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0049] The following combination Figures 1 to 7As shown, an embodiment of the present invention provides an aerospace precision spiral milling device, including a spiral drive base 1, an eccentric rotating drum 2 is rotatably connected to the interior of the spiral drive base 1, a motor 3 is installed on the inner side of the eccentric rotating drum 2, the central axis of the eccentric rotating drum 2 is parallel to the central axis of the spiral drive base 1 and the spacing is adjustable, the spiral drive base 1 can drive the eccentric rotating drum 2 so that the eccentric rotating drum 2 performs planetary motion around the central axis of the spiral drive base 1, a limit plate 9 is provided at one end of the eccentric rotating drum 2, a mounting cylinder 4 for transmission with the output end of the motor 3 is rotatably connected to the limit plate 9, the central axes of the eccentric rotating drum 2, the limit plate 9, the mounting cylinder 4 and the motor 3 coincide, and the motor 3 can drive the mounting cylinder 4 to rotate;

[0050] The front end of the mounting tube 4 is connected to a first clamping assembly 5 for clamping the middle section of the milling cutter, and the interior of the mounting tube 4 is slidably connected to a second clamping assembly 6 for clamping the end section of the milling cutter. The outer side of the mounting tube 4 is sleeved with a first screw sleeve 7 and a second screw sleeve 8. The first screw sleeve 7 and the second screw sleeve 8 cooperate to enable the second clamping assembly 6 to clamp the milling cutter, and the first screw sleeve 7 and the second screw sleeve 8 can both adjust their positions on the mounting tube 4.

[0051] The spiral drive base 1 drives the eccentric drum 2 to rotate, thereby causing the eccentric drum 2 to perform planetary motion. The technical solution that the milling cutter can perform a spiral motion simultaneously during the feeding process is an existing technical solution. For example, the patent document with publication number CN101633060A discloses an automatic spiral milling unit, which uses a method of adjusting the eccentricity of two eccentric sleeves to achieve planetary motion when the milling cutter rotates. The above-mentioned solution of how to control the milling cutter to perform spiral feed cutting is not a technical problem to be solved by this embodiment, and will not be elaborated here. This embodiment mainly designs a structure for clamping the milling cutter installed on the output end of the motor 3, thereby achieving the following technical effects:

[0052] 1. The present invention is provided with a first clamping assembly 5 with a fixed position and a second clamping assembly 6 with an adjustable position. The first clamping assembly 5 is used to clamp the middle part of the milling cutter, and the second clamping assembly 6 is used to clamp the end part of the milling cutter, thereby forming two clamping areas on the milling cutter. The two clamping mechanisms not only increase the area for clamping the milling cutter, but also the clamping areas are distributed in the middle part and the end of the milling cutter, effectively improving the stability of the front end of the milling cutter during cutting, thereby further improving the processing accuracy of the milling cutter.

[0053] 2. The distance between the second clamping assembly 6 and the first clamping assembly 5 of the present invention is adjustable, thereby ensuring that the second clamping assembly 6 can always be clamped at the end of the milling cutter. Therefore, it can be applied to milling cutters of different lengths and sizes, thereby improving the applicability of the device.

[0054] 3. The present invention limits the position of the second elastic collet 62 so that the central axes of the second elastic collet 62 and the first elastic collet 51 always coincide with each other, thereby facilitating installation and removal of the milling cutter.

[0055] 4. The present invention designs a second pressing slide block 63 for pressing the second elastic collet 62. When the second screw sleeve 8 is used to control the second pressing slide block 63 to squeeze the second elastic collet 62, the second pressing slide block 63 can be elastically pressed on the second elastic collet 62, thereby improving the stability of the second elastic collet 62 in clamping the milling cutter.

[0056] Among them, the rear end of the mounting cylinder 4 is provided with a transmission card hole 41 for engaging with the output end of the motor 3, the front end of the mounting cylinder 4 is provided with a first cylinder clamping groove 42, the interior of the mounting cylinder 4 is provided with a first sliding cavity 43 which coincides with the central axis of the mounting cylinder 4, and a milling cutter channel 44 for communication is provided between the first sliding cavity 43 and the first cylinder clamping groove 42, and a plurality of through sliding grooves 45 distributed along the length direction of the mounting cylinder 4 are provided on the mounting cylinder 4, and the outer circumferential surface of the mounting cylinder 4 is provided with an external thread.

[0057] The first clamping assembly 5 includes a first elastic collet 51 and a pressing cylinder 52. The first elastic collet 51 can be placed in the first collet pressing groove 42. The pressing cylinder 52 can be sleeved with the thread at the front end of the mounting cylinder 4. The pressing cylinder 52 can work together with the first collet pressing groove 42 to squeeze the first elastic collet 51 so that the first elastic collet 51 clamps the milling cutter.

[0058] The first elastic collet 51 includes a first front section 511 and a first rear section 512 , and the outer sides of the first front section 511 and the first rear section 512 are both conical surfaces;

[0059] A second through hole 521 is provided in the center of the pressing cylinder 52 , and a second cylinder clamping groove 522 that matches the shape of the first front section 511 is provided on one side of the pressing cylinder 52 close to the mounting cylinder 4 . The inner wall shape of the first cylinder clamping groove 42 matches the shape of the first rear section 512 .

[0060] The outer circumferential surface at the connection between the first front section 511 and the first rear section 512 is recessed to form a first annular groove 513. An axial first through hole penetrating the first front section 511 and the first rear section 512 is provided at the center of the first elastic collet 51. A plurality of first grooves 514 and second grooves 515 are provided on the side wall of the first elastic collet 51. The plurality of first grooves 514 and the plurality of second grooves 515 are staggered one by one. The plurality of first grooves 514 and the plurality of second grooves 515 all extend along the axial direction of the first elastic collet 51. The plurality of first grooves 514 all penetrate the side wall of the first front section 511, and the plurality of second grooves 515 all penetrate the side wall of the first rear section 512.

[0061] Specifically, the first clamping assembly 5 is used to clamp the middle part of the milling cutter, and the technical solution of the first elastic collet 51 is a more conventional technical solution for clamping the milling cutter in the prior art. When the first front section 511 and the first rear section 512 of the first elastic collet 51 are squeezed by the groove body with the matching structure, the first elastic collet 51 will deform evenly, thereby fully clamping the milling cutter of appropriate size passing through the middle of the first elastic collet 51. In this embodiment, the first collet pressing groove 42 is opened at the front end of the mounting cylinder 4 to match the outer side of the first rear section 512, and the first collet pressing groove 42 is pressed by the first rear section 512 of the mounting cylinder 4 to match the outer side of the first rear section 512. A rear section 512 fits in with the outer side of the first front section 511. When the first clamping assembly 5 is threadedly sleeved on the front end of the mounting tube 4 and continuously screwed in, the second tube clamp pressure groove 522 cooperates with the first tube clamp pressure groove 42 to squeeze the first front section 511 and the first rear section 512 at the same time. Therefore, when installing the milling cutter, the milling cutter needs to be passed through the second through hole 521 of the pressure cylinder 52, and then through the first through hole of the first elastic tube clamp 51 (not shown in the figure). Finally, when confirming that the second clamping assembly 6 clamps the end of the milling cutter, the pressure cylinder 52 is tightened on the mounting tube 4 so that the first elastic tube clamp 51 clamps the middle part of the milling cutter.

[0062] The second clamping assembly 6 includes a first pressing slide 61, a second elastic collet 62, and a second pressing slide 63 slidably connected within the first sliding cavity 43. The second elastic collet 62 is located between the first pressing slide 61 and the second pressing slide 63 and is used to clamp the milling cutter. The second elastic collet 62 includes a second front section 621 and a second rear section 622. The outer sides of the second front section 621 and the second rear section 622 are both conical surfaces.

[0063] A third collet pressing groove 611 is formed at one end of the first pressing slide 61 close to the second elastic collet 62. The inner wall shape of the third collet pressing groove 611 matches the outer shape of the second front section 621. A fourth collet pressing groove 631 is formed at one end of the second pressing slide 63 close to the second elastic collet 62. The inner wall shape of the fourth collet pressing groove 631 matches the outer shape of the second rear section 622.

[0064] Through holes are formed in the centers of the first pressing slide block 61 , the second elastic collet 62 and the second pressing slide block 63 .

[0065] A second annular groove 623 is formed at the connection between the second front section 621 and the second rear section 622. A plurality of third grooves 624 and a plurality of fourth grooves 625 are provided on the side wall of the second elastic collet 62. The plurality of third grooves 624 and the plurality of fourth grooves 625 are alternately distributed one by one. The plurality of third grooves 624 and the plurality of fourth grooves 625 all extend along the axial direction of the second elastic collet 62. The plurality of third grooves 624 all penetrate the side wall of the second front section 621, and the plurality of fourth grooves 625 all penetrate the side wall of the second rear section 622.

[0066] A plurality of second sliding cavities 612 distributed along the length direction of the mounting tube 4 are provided on the inner wall of the third barrel clamp pressure groove 611, and a cavity slider 613 is slidably connected in each second sliding cavity 612. A spring 614 for elastically supporting the cavity slider 613 is provided in each second sliding cavity 612, and each cavity slider 613 is provided with a connecting rod 615 that passes through the first pressure slider 61 and is connected to the second elastic barrel clamp 62.

[0067] The interior of the second pressure sliding block 63 is provided with a plurality of third sliding cavities 632 distributed along the length direction of the mounting tube 4. Each third sliding cavity 632 is provided with an outer sliding groove 633 extending to the outside of the second pressure sliding block 63. The length of the third sliding cavity 632 is greater than the length of the corresponding outer sliding groove 633. A cavity sliding plug 634 is slidably connected in each third sliding cavity 632. The length of the cavity sliding plug 634 is greater than the length of the corresponding outer sliding groove 633. Hydraulic oil is filled between the cavity sliding plug 634 and the corresponding third sliding cavity 632.

[0068] Specifically, the second clamping assembly 6 is used to clamp the end portion of the milling cutter. After the milling cutter passes through the first clamping assembly 5 and the milling cutter channel 44, the end of the milling cutter passes through the first pressure slider 61 and extends into the through hole of the second elastic collet 62. Then, by screwing the first screw sleeve 7 and the second screw sleeve 8, the first pressure slider 61 and the second pressure slider 63 squeeze the second front section 621 and the second rear section 622 of the second elastic collet 62, so that the second elastic collet 62 squeezes the inner milling cutter portion.

[0069] Furthermore, since the second elastic collet 62 is formed to clamp the inner milling cutter portion by overall deformation, the outer side of the second elastic collet 62 should not contact the inner wall of the first sliding cavity 43. In order to ensure that the second elastic collet 62 and the first elastic collet 51 are on the same central axis, so that the milling cutter can accurately extend into the second elastic collet 62 after passing through the first elastic collet 51, a plurality of connecting rods 615 are provided on the first pressing slide 61 to connect with the second elastic collet 62, so that the second elastic collet 62 is always on the same central axis. On the center axis; in addition, when the second elastic collet 62 is not clamping the milling cutter, it is necessary to prevent the second elastic collet 62 from being partially clamped due to the force on the second front section 621. Specifically, the cavity slider 613 is elastically supported by multiple springs 614, so that there must be a gap between the second front section 621 connected by multiple connecting rods 615 and the third collet pressure groove 611. When the third collet pressure groove 611 squeezes the second front section 621, the multiple connecting rods 615 extend into the second sliding cavity 612, so that the third collet pressure groove 611 is fully in contact with the second front section 621.

[0070] Among them, the first screw sleeve 7 is connected to the outer side of the mounting tube 4 through a threaded sleeve, and a first inner annular groove 71 surrounding the inner circumference of the first screw sleeve 7 is opened on the inner side of the first screw sleeve 7. A plurality of first inner sliding blocks 72 are slidably connected in the first inner annular groove 71. The plurality of first inner sliding blocks 72 are slidably connected in the plurality of through sliding grooves 45 one by one, and the ends of the plurality of first inner sliding blocks 72 are fixedly connected to the first pressure sliding block 61. The outer side of the first screw sleeve 7 is a polygonal structure.

[0071] The second screw sleeve 8 is connected to the outer side of the mounting tube 4 through a threaded connection. A second inner annular groove 81 surrounding the inner circumference of the second screw sleeve 8 is opened on the inner side of the second screw sleeve 8. A plurality of second inner sliding blocks 82 are slidably connected in the second inner annular groove 81. The plurality of second inner sliding blocks 82 are slidably connected in the plurality of through grooves 45 and the plurality of outer grooves 633 in a one-to-one manner, and the ends of the plurality of second inner sliding blocks 82 are connected in a one-to-one manner to the plurality of outer grooves 633. The outer side of the second screw sleeve 8 is a polygonal structure.

[0072] Specifically, when the first screw sleeve 7 is screwed, the position of the first pressure slider 61 in the first sliding cavity 43 will be adjusted together with the first pressure slider 61. According to the position of the end of the milling cutter in the first sliding cavity 43, the position of the first pressure slider 61 in the first sliding cavity 43 is adjusted so that the end of the milling cutter is located on the inner side of the second elastic collet 62, thereby ensuring that the end of the milling cutter forms a clamping area. When the first screw sleeve 7 is screwed, the first screw sleeve 7 moves along the length direction of the mounting tube 4 under the action of the thread. At this time, multiple first inner sliders 72 slide in the first inner annular groove 71, and move distributedly along the length direction of the mounting tube 4 together with the first pressure slider 61 connected together.

[0073] Specifically, when the second screw sleeve 8 is turned, it and the second pressing slide 63 adjust their positions within the first slide cavity 43. The second screw sleeve 8, under the action of the thread, moves along the length of the mounting barrel 4. At this time, the multiple second inner slides 82 slide within the second inner annular groove 81 and, together with the second pressing slide 63 connected thereto, move toward the second elastic collet 62, squeezing the second elastic collet 62.

[0074] Furthermore, as the second screw sleeve 8 moves together with the second inner slider 82 along the length direction of the mounting tube 4 until the second elastic collet 62 is squeezed, the moving second inner slider 82 will first squeeze the hydraulic oil into the third sliding cavity 632 together with the connected cavity slide plug 634 until the fourth collet pressure groove 631 fully squeezes the second rear section 622. At this time, the hydraulic oil in the third sliding cavity 632 is fully squeezed by the cavity slide plug 634, and the hydraulic oil provides elastic support for the second pressure slider 63 to squeeze the second elastic collet 62.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An aerospace precision spiral milling device, comprising a spiral drive base (1), wherein the interior of the spiral drive base (1) is rotatably connected to an eccentric rotating drum (2), a motor (3) is installed on the inner side of the eccentric rotating drum (2), the central axis of the eccentric rotating drum (2) is parallel to the central axis of the spiral drive base (1) and the spacing is adjustable, the spiral drive base (1) is capable of driving the eccentric rotating drum (2) so that the eccentric rotating drum (2) performs planetary motion around the central axis of the spiral drive base (1), and is characterized in that: One end of the eccentric rotating cylinder (2) is provided with a limiting disk (9), and a mounting cylinder (4) for driving the output end of the motor (3) is rotatably connected to the limiting disk (9), and the central axes of the eccentric rotating cylinder (2), the limiting disk (9), the mounting cylinder (4) and the motor (3) coincide with each other, and the motor (3) can drive the mounting cylinder (4) to rotate; The front end of the mounting cylinder (4) is connected to a first clamping assembly (5) for clamping the middle section of the milling cutter, the interior of the mounting cylinder (4) is slidably connected to a second clamping assembly (6) for clamping the end section of the milling cutter, the outer side of the mounting cylinder (4) is sleeved with a first screw sleeve (7) and a second screw sleeve (8), the first screw sleeve (7) and the second screw sleeve (8) cooperate to enable the second clamping assembly (6) to clamp the milling cutter, and the first screw sleeve (7) and the second screw sleeve (8) can both adjust their positions on the mounting cylinder (4); The rear end of the mounting tube (4) is provided with a transmission clamping hole (41) for engaging with the output end of the motor (3), the front end of the mounting tube (4) is provided with a first tube clamping groove (42), the interior of the mounting tube (4) is provided with a first sliding cavity (43) that coincides with the central axis of the mounting tube (4), a milling cutter channel (44) for communication is provided between the first sliding cavity (43) and the first tube clamping groove (42), the mounting tube (4) is provided with a plurality of through sliding grooves (45) distributed along the length direction of the mounting tube (4), and the outer circumferential surface of the mounting tube (4) is provided with an external thread; The first clamping assembly (5) includes a first elastic collet (51) and a pressing cylinder (52), the first elastic collet (51) can be placed in the first collet pressing groove (42), the pressing cylinder (52) can be connected to the threaded sleeve of the front end of the mounting cylinder (4), and the pressing cylinder (52) can squeeze the first elastic collet (51) together with the first collet pressing groove (42) to enable the first elastic collet (51) to clamp the milling cutter; The second clamping assembly (6) comprises a first pressing slide (61), a second elastic collet (62) and a second pressing slide (63) slidably connected in the first sliding cavity (43), the second elastic collet (62) being located between the first pressing slide (61) and the second pressing slide (63) and being used to clamp the milling cutter; The interior of the second pressing slide block (63) is provided with a plurality of third sliding cavities (632) distributed along the length direction of the mounting cylinder (4), and each of the third sliding cavities (632) is provided with an outer sliding groove (633) extending to the outside of the second pressing slide block (63); each of the third sliding cavities (632) is slidably connected to a cavity sliding plug (634); The first screw sleeve (7) is threadedly sleeved on the outer side of the mounting tube (4), and a first inner annular sliding groove (71) surrounding the inner circumference of the first screw sleeve (7) is provided on the inner side of the first screw sleeve (7), and a plurality of first inner sliding blocks (72) are slidably connected in the first inner annular sliding groove (71), and the plurality of first inner sliding blocks (72) are slidably connected in the plurality of through sliding grooves (45) in a one-to-one correspondence, and the ends of the plurality of first inner sliding blocks (72) are fixedly connected to the first pressure sliding block (61), and the outer side of the first screw sleeve (7) is a polygonal structure; The second screw sleeve (8) is threadedly sleeved on the outer side of the mounting tube (4), and a second inner annular sliding groove (81) surrounding the inner circumference of the second screw sleeve (8) is provided on the inner side of the second screw sleeve (8), and a plurality of second inner sliding blocks (82) are slidably connected in the second inner annular sliding groove (81), and the plurality of second inner sliding blocks (82) are slidably connected in the plurality of through sliding grooves (45) and the plurality of outer sliding grooves (633) in a one-to-one correspondence, and the ends of the plurality of second inner sliding blocks (82) are connected in a one-to-one correspondence to the plurality of outer sliding grooves (633), and the outer side of the second screw sleeve (8) is a polygonal structure.

2. The aerospace precision spiral milling device according to claim 1, characterized in that: The first elastic collet (51) comprises a first front section (511) and a first rear section (512), and the outer sides of the first front section (511) and the first rear section (512) are both conical surfaces; A second through hole (521) is provided at the center of the pressing cylinder (52), and a second cylinder clamping groove (522) matching the shape of the first front section (511) is provided on a side of the pressing cylinder (52) close to the mounting cylinder (4), and the inner wall shape of the first cylinder clamping groove (42) matches the shape of the first rear section (512).

3. The aerospace precision spiral milling device according to claim 2, characterized in that: The outer circumferential surface at the connection point of the first front section (511) and the first rear section (512) is recessed to form a first annular groove (513); a first axial through hole penetrating the first front section (511) and the first rear section (512) is provided at the center of the first elastic collet (51); the first through hole is for the milling cutter to pass through; a plurality of first grooves (514) and a plurality of second grooves (515) are provided on the side wall of the first elastic collet (51); the plurality of first grooves (514) and the plurality of second grooves (515) are staggered and distributed one by one; the plurality of first grooves (514) and the plurality of second grooves (515) all extend along the axial direction of the first elastic collet (51); the plurality of first grooves (514) all penetrate the side wall of the first front section (511); and the plurality of second grooves (515) all penetrate the side wall of the first rear section (512).

4. The aerospace precision spiral milling device according to claim 2, characterized in that: The second elastic collet (62) comprises a second front section (621) and a second rear section (622), and the outer sides of the second front section (621) and the second rear section (622) are both conical surfaces; A third cartridge pressing groove (611) is provided on one end of the first pressing slide block (61) close to the second elastic cartridge (62), and the inner wall shape of the third cartridge pressing groove (611) matches the outer shape of the second front section (621); a fourth cartridge pressing groove (631) is provided on one end of the second pressing slide block (63) close to the second elastic cartridge (62), and the inner wall shape of the fourth cartridge pressing groove (631) matches the outer shape of the second rear section (622); The centers of the first pressing slide block (61), the second elastic collet (62) and the second pressing slide block (63) are all provided with through holes.

5. The aerospace precision spiral milling device according to claim 4, characterized in that: A second annular groove (623) is formed at the connection point between the second front section (621) and the second rear section (622), and a plurality of third grooves (624) and a fourth groove (625) are provided on the side wall of the second elastic collet (62), and the plurality of third grooves (624) and the plurality of fourth grooves (625) are staggered and distributed one by one, and the plurality of third grooves (624) and the plurality of fourth grooves (625) all extend along the axial direction of the second elastic collet (62), and the plurality of third grooves (624) all penetrate the side wall of the second front section (621), and the plurality of fourth grooves (625) all penetrate the side wall of the second rear section (622).

6. The aerospace precision spiral milling device according to claim 4, characterized in that: A plurality of second sliding cavities (612) distributed along the length direction of the mounting tube (4) are provided on the inner wall of the third tube clamp pressure groove (611), each of the second sliding cavities (612) is slidably connected to a cavity slider (613), each of the second sliding cavities (612) is provided with a spring (614) for elastically supporting the cavity slider (613), and each of the cavity sliders (613) is provided with a connecting rod (615) passing through the first pressure slider (61) and connected to the second elastic tube clamp (62).

7. The aerospace precision spiral milling device according to claim 4, characterized in that: The length of the third sliding cavity (632) is greater than the length of the corresponding outer sliding groove (633), the length of the cavity sliding plug (634) is greater than the length of the corresponding outer sliding groove (633), and hydraulic oil is filled between the cavity sliding plug (634) and the corresponding third sliding cavity (632).

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