A CNC cutting tool for precision machining of aerospace titanium alloy parts

Abstract

The present invention belongs to the technical field of mechanical parts processing, and discloses: a CNC tool for precision processing of aviation titanium alloy parts, including a tool assembly, wherein the tool assembly includes a shell and a cutter head with a spline-shaped top cross-section and matched with the inner wall of the shell, and also includes: an elastic member, which is arranged on the top of the shell; the above scheme, through the cooperation between structures such as a counterweight block, an elastic clamping block, an arc-shaped connecting rod and an inclined block, enables the device to improve the safety of people when installing the tool, by pressing the elastic block one to release the fixation of the elastic block two to the tapered groove, and then installing the whole device on the machine tool, turning the paddle to make the inclined block squeeze the square groove, the counterweight block moves toward the cutter head and makes the arc-shaped connecting rod rotate to drive the elastic clamping block away from the cutter head, and the cutter head falls due to gravity, and when the inclined block passes through the square groove, the elastic clamping block will be reset under the elastic force of the spring piece, and the conical part of the elastic clamping block will be stuck in the tapered groove and fix the cutter head.

Description

Technical Field

[0001] The present invention belongs to the technical field of machining of mechanical parts, and specifically relates to a numerical control tool for precision machining of aviation titanium alloy parts. Background Art

[0002] The machining of aviation titanium alloy is difficult. Modern numerical control tool technology provides efficient and high-precision solutions for titanium alloy machining through material optimization, improvement of cutting theory and upgrading of manufacturing technology, and improves machining efficiency and production benefits through intelligent management. With the continuous development of technology, numerical control tools will play a more crucial role in the machining of aviation titanium alloy. For a cylindrical milling cutter, it is usually divided into two parts: a tool shank and a tool tip. The tool tip is mainly helical-toothed, and the tool shank is a smooth cylinder. When people install the tool on a machine tool, they usually first hold the tool shank and insert it into the fixture of the machine tool, and then apply pressure to the tool tip so that the entire tool shank part is fixed in the machine tool. However, when people apply pressure to the tool tip by hand, since the tool tip is relatively sharp, it may cut people's hands, causing a safety hazard. To solve the above problems, a numerical control tool for precision machining of aviation titanium alloy parts is proposed. Summary of the Invention

[0003] To solve the problems raised in the above background art, the present invention provides a numerical control tool for precision machining of aviation titanium alloy parts, which solves the problem that the tool tip will cut people's hands when installing the tool.

[0004] To achieve the above object, the present invention provides the following technical solution: A numerical control tool for precision machining of aviation titanium alloy parts, including a tool assembly, the tool assembly includes a housing and a tool tip with a spline-shaped top cross-section and adapted to the inner wall of the housing, and further includes;

[0005] An elastic member, which is arranged at the top of the housing;

[0006] An annular member and a fixing assembly, both of which are movably installed at the bottom of the housing;

[0007] Wherein, the housing is elastically and fixedly connected with a first elastic block, the outer periphery of the tool tip is annularly and arrayed with tapered grooves, and the inner part of the housing is elastically connected with a second elastic block that can be clamped into the tapered grooves;

[0008] The fixing assembly includes arc-shaped connecting rods that are circumferentially arrayed and hinged to the bottom of the housing. The two ends of the arc-shaped connecting rods are respectively hinged with an elastic clamping block and a counterweight block that are movably installed inside the housing. One end of the elastic clamping block is fixedly connected with a spring plate located inside the housing and presses the elastic clamping block to have a tendency to move towards the tool tip. A square groove is formed inside the counterweight block;

[0009] The annular member includes an annular ring sleeved on the bottom of the housing, and the inner wall of the annular ring is fixedly connected with three inclined blocks;

[0010] Press the first elastic block to lower the housing, and then install the cutter head on the machine tool. Subsequently, when the annular ring rotates to drive the paddle to rotate, the inner wall of the square groove is extruded, and the counterweight moves towards the cutter head. At the same time, the arc-shaped connecting rod rotates and drives the elastic clamping block away from the cutter head. At this time, the housing descends to the bottom. Continue to rotate the annular ring until the inclined block completely passes through the square groove and then stop. At this time, the elastic clamping block moves towards the cutter head under the elastic force of the elastic piece and fixes it.

[0011] Preferably, there is a gap between the bottom of the first elastic block and the top of the cutter head, and the part of the second elastic block that is stuck into the conical groove is dome-shaped.

[0012] Preferably, the fixing assembly further includes arc-shaped grooves opened at both ends of the arc-shaped connecting rod, and both the middle of the elastic clamping block and one end of the counterweight located inside the arc-shaped groove slide inside the corresponding arc-shaped groove.

[0013] Preferably, the distance from the hinge joint of the counterweight and the arc-shaped connecting rod to the axis of the arc-shaped connecting rod is greater than the distance from the hinge joint of the elastic clamping block and the arc-shaped connecting rod to the arc-shaped connecting rod. The end of the elastic clamping block facing the housing is conical and can be stuck into the conical groove, and the mass of the counterweight is greater than that of the elastic clamping block.

[0014] Preferably, the middle part of the inclined block is an arc-shaped surface concentric with the housing, and the inclined block is also provided with a vertical surface. When the inclined block passes through the square groove, when the elastic clamping block is reset under the elastic force, it drives the counterweight to reset through the arc-shaped connecting rod. At this time, the vertical surface at the inclined block abuts against the counterweight.

[0015] Preferably, the annular member further includes three convex blocks fixedly connected to the top of the annular ring;

[0016] Three paddles annularly arrayed on the outer periphery of the annular ring;

[0017] Arc-shaped spring rods arranged inside the paddles;

[0018] The arc-shaped spring rod is composed of an arc-shaped rod and an arc-shaped spring. The arc-shaped rod is movably sleeved inside the paddle and both ends are fixedly connected to the housing, and the arc-shaped spring is fixedly connected to the inner wall of the housing and is used to support the paddle.

[0019] Preferably, the bottom of the housing is also movably connected with a reset assembly located above the annular member, and the reset assembly includes a disc block that can rotate inside the housing;

[0020] A cylinder sleeved inside the disc block and sleeved outside the cutter head;

[0021] An elastic ring fixedly connected to the top of the cylinder;

[0022] The outer circumference of the cylinder is provided with a guide groove array, the disk block is fixed with a convex column that can slide inside the guide groove, and the disk block is also provided with a notch that cooperates with the convex column;

[0023] The paddle rotates through the disk block to drive the convex column to slide in the guide groove, and forces the cylinder to move upward to squeeze the elastic ring.

[0024] Preferably, the cross-section of the top of the cylinder is spline-shaped and cooperates with the inner wall of the shell, so that the cylinder can only slide up and down in the shell.

[0025] Preferably, when the spline at the top of the cutter head moves downward to contact the elastic ring, the tapered groove and the elastic block are at the same height.

[0026] Preferably, the elastic ring comprises two parts, a circular ring and a spring, and the spring is fixed to the top of the cylinder and is used to support the circular ring.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The above scheme improves the safety of people when installing the tool by cooperating between the counterweight block, the elastic clamp block, the arc connecting rod and the inclined block. The whole device is installed on the machine tool by pressing the elastic block one to release the fixation of the tapered groove by the elastic block two. The paddle is turned to make the inclined block squeeze the square groove. The counterweight block moves toward the tool head and the arc connecting rod rotates to drive the elastic clamp block away from the tool head. The tool head falls due to gravity. When the inclined block passes through the square groove, the elastic clamp block will be reset under the elastic force of the spring, and the conical part of the elastic clamp block will be stuck in the tapered groove to fix the tool head.

[0029] The above scheme enables the device to have a good fixing effect on the cutter head through the cooperation between the counterweight block, the elastic clamp block and the arc connecting rod. When the machine tool drives the device to rotate, since the mass of the elastic clamp block is smaller than the counterweight block and the counterweight block is located at the force-saving arm, the counterweight block will have a tendency to move away from the cutter head under the action of centrifugal force, and the elastic clamp block will have a tendency to move toward the cutter head, so that the device has a good fixing effect on the cutter head.

[0030] The above scheme makes the device easy to collect through the coordination between structures such as the counterweight block, the elastic ring and the arc-shaped connecting rod. By pressing the three counterweight blocks and using the arc-shaped connecting rod to disengage the elastic block from the cutter head, the cutter head will be squeezed upward under the action of the elastic force of the elastic ring and re-fixed by the elastic block. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the matching structure of the fixing component and the resetting component of the present invention;

[0033] Figure 3 is the top-down plan view of the present invention;

[0034] Figure 4 is Figure 2 the schematic structural view at A-A in

[0035] Figure 5 is Figure 2 the schematic structural view at B-B in

[0036] Figure 6 is the top cross-sectional structural view of the annular ring of the present invention;

[0037] Figure 7 is the schematic structural view of the mating part of the annular ring and the arc-shaped rod of the present invention;

[0038] Figure 8 is the schematic structural view of the annular part of the present invention;

[0039] Figure 9 is the schematic structural view and the exploded view of the fixing component of the present invention;

[0040] Figure 10 is the schematic structural view and the exploded view of the reset component of the present invention;

[0041] Figure 11 is the schematic structural view at the cutter head of the present invention.

[0042] In the figure: 1. Tool assembly; 11. Outer shell; 12. Cutter head; 2. Elastic member; 21. First elastic block; 22. Second elastic block; 23. Conical groove; 3. Annular part; 31. Annular ring; 32. Arc-shaped spring rod; 33. Inclined block; 34. Paddle; 35. Protrusion; 4. Fixing component; 41. Arc-shaped connecting rod; 411. Arc-shaped groove; 42. Elastic clamping block; 421. Elastic sheet; 43. Counterweight; 44. Square groove; 5. Reset component; 51. Disk block; 52. Convex column; 53. Notch; 54. Cylinder; 55. Guide groove; 56. Elastic ring. Detailed implementation manners

[0043] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0044] In the description of the present application, the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0045] In the description of the present application, the term "for example" is used to mean "serving as an example, illustration, or explanation". Any embodiment described as "for example" in the present application is not necessarily construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present invention. In the following description, details are set forth for purposes of explanation. It should be understood that those of ordinary skill in the art can recognize that the present invention can be implemented without using these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the present invention with unnecessary details. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope that conforms to the principles and features disclosed in the present application.

[0046] As Figures 1 to 11 shown, the present invention provides a numerical control tool for precision machining of aerospace titanium alloy parts, including a tool assembly 1. The tool assembly 1 includes a housing 11 and a tool head 12 with a spline-shaped top cross-section that mates with the inner wall of the housing 11, and further includes;

[0047] An elastic member 2, which is arranged at the top of the housing 11;

[0048] An annular member 3 and a fixing assembly 4, both of which are movably installed at the bottom of the housing 11;

[0049] Wherein, the housing 11 is elastically and fixedly connected with a first elastic block 21, a tapered groove 23 is annularly arrayed on the outer periphery of the tool head 12, and a second elastic block 22 that can be clamped into the tapered groove 23 is elastically connected inside the housing 11;

[0050] The fixing assembly 4 includes arc-shaped connecting rods 41 that are circumferentially arrayed and hinged to the bottom of the housing 11. The two ends of the arc-shaped connecting rods 41 are respectively hinged with an elastic clamping block 42 and a counterweight block 43 that are movably installed inside the housing 11. One end of the elastic clamping block 42 is fixedly connected with a spring piece 421 located inside the housing 11 and propping up the elastic clamping block 42 to have a tendency to move towards the tool head 12, and a square groove 44 is opened inside the counterweight block 43;

[0051] The annular member 3 includes an annular ring 31 sleeved on the bottom of the housing 11, and three inclined blocks 33 are fixedly connected to the inner wall of the annular ring 31;

[0052] After pressing the elastic block 21 to make the housing 11 move downward, the cutter head 12 is installed on the machine tool. Then, the annular ring 31 rotates to drive the paddle 34 to rotate and squeeze the inner wall of the square groove 44, and the counterweight block 43 moves toward the cutter head 12. At the same time, the arc connecting rod 41 rotates and drives the elastic block 42 away from the cutter head 12. At this time, the housing 11 moves downward to the bottom, and the annular ring 31 continues to rotate to make the inclined block 33 completely pass through the square groove 44 and then stop. At this time, the elastic block 42 is moved toward the cutter head 12 by the elastic force of the spring sheet 421 and fixed to it.

[0053] By adopting the above scheme, the elastic block 1 21 is pressed to release the elastic block 22 from fixing the conical groove 23, and then the entire device is installed on the machine tool. The paddle 34 is turned to make the inclined block 33 squeeze the square groove 44, and the counterweight block 43 moves toward the cutter head 12 and causes the arc-shaped connecting rod 41 to rotate to drive the elastic block 42 away from the cutter head 12. The cutter head 12 falls due to gravity. When the inclined block 33 passes through the square groove 44, the elastic block 42 will be reset under the elastic force of the spring piece 421, and the conical part of the elastic block 42 will be stuck in the conical groove 23 and fix the cutter head 12.

[0054] like Figures 2 - 5 As shown, there is a gap between the bottom of the elastic block 1 21 and the top of the cutter head 12, and the part of the elastic block 22 inserted into the conical groove 23 is dome-shaped;

[0055] With the above solution, the cooperation between the elastic block 22 and the tapered groove 23 can make the cutter head 12 move downward when the elastic block 1 21 is pressed, and can also be fixed again by the elastic block 2 2 when the cutter head 12 moves upward.

[0056] like Figures 1 - 2 and Figures 4 - 9 As shown, the fixing assembly 4 also includes arc grooves 411 opened at both ends of the arc connecting rod 41, and the middle part of the elastic block 42 and one end of the counterweight block 43 located inside the arc groove 411 both slide inside the corresponding arc groove 411;

[0057] The distance between the hinged joint of the counterweight block 43 and the arc connecting rod 41 and the axis of the arc connecting rod 41 is greater than the distance between the hinged joint of the elastic block 42 and the arc connecting rod 41 and the arc connecting rod 41. The end of the elastic block 42 facing the housing 11 is a cone that can be inserted into the conical groove 23. The mass of the counterweight block 43 is greater than that of the elastic block 42.

[0058] By adopting the above scheme, the device is driven to rotate by the machine tool. Since the mass of the elastic block 42 is smaller than the counterweight block 43, and the counterweight block 43 is located at the force-saving arm, the counterweight block 43 will tend to move away from the cutter head 12 under the action of centrifugal force, and the elastic block 42 tends to move toward the cutter head 12, thereby enabling the device to fix the cutter head 12 well.

[0059] like Figures 6 - 8As shown, the middle part of the inclined block 33 is an arc surface concentric with the outer shell 11. The inclined block 33 is also provided with a vertical surface. When the inclined block 33 passes through the square groove 44, when the elastic clamping block 42 is reset by the elastic force, it drives the counterweight block 43 to reset through the arc connecting rod 41. At this time, the vertical surface at the inclined block 33 abuts against the counterweight block 43.

[0060] With the above scheme, through the design of the vertical surface, when the inclined block 33 completely passes through the square groove 44, the counterweight block 43 will reset at this time, so as to abut against the inclined block 33 to ensure the energy storage of the device, so that the operator can retract the cutter head 12.

[0061] As Figures 4 - 8 and Figure 10 shown, the annular part 3 further includes three groups of convex blocks 35 fixedly connected to the top of the annular ring 31;

[0062] Three sliders 34 annularly arranged on the outer periphery of the annular ring 31;

[0063] An arc spring rod 32 arranged inside the slider 34;

[0064] The arc spring rod 32 is composed of an arc rod and an arc spring. The arc rod is movably sleeved inside the slider 34 and both ends are fixedly connected to the outer shell 11. The arc spring is fixedly connected to the inner wall of the outer shell 11 and is used to support the slider 34;

[0065] The bottom of the outer shell 11 is also movably connected with a reset assembly 5 located above the annular part 3. The reset assembly 5 includes a disk block 51 that can rotate inside the outer shell 11;

[0066] A cylinder 54 sleeved inside the disk block 51 and outside the cutter head 12;

[0067] An elastic ring 56 fixedly connected to the top of the cylinder 54;

[0068] The outer circumference of the cylinder 54 is circumferentially arranged and provided with a guide groove 55. The disk block 51 is fixedly connected with a convex column 52 that can slide inside the guide groove 55. The disk block 51 is also provided with a notch 53 that cooperates with the convex block 35 for clamping;

[0069] The rotation of the slider 34 drives the convex column 52 to slide in the guide groove 55 through the disk block 51, and forces the cylinder 54 to move upward to squeeze the elastic ring 56;

[0070] By adopting the above scheme, when the cutter head 12 falls under the action of gravity, its top contacts the elastic ring 56 and stops descending. The rotation of the paddle 34 will also drive the disk block 51 and the boss 52 to rotate through the protrusion 35, thereby causing the boss 52 to slide in the guide groove 55 and force the cylinder 54 to move upward. At this time, since the elastic block 42 is stuck in the cutter head 12, the spring under the elastic ring 56 will be compressed and accumulate force. When the cutter head 12 needs to be reset, the three counterweight blocks 43 are pressed, and the elastic block 42 is separated from the fixation of the cutter head 12 through the arc connecting rod 41. At this time, the cutter head 12 will be squeezed upward by the elastic force of the elastic ring 56 and re-fixed by the elastic block 22. At the same time, the annular ring 31 will be reset under the action of the arc spring.

[0071] like Figure 2 , Figures 4 - 5 and Figure 10 As shown, the cross section of the top of the cylinder 54 is spline-shaped and cooperates with the inner wall of the housing 11, so that the cylinder 54 can only slide up and down in the housing 11;

[0072] When the spline at the top of the cutter head 12 moves downward until it contacts the elastic ring 56, the tapered groove 23 and the elastic block 42 are at the same height;

[0073] The elastic ring 56 includes two parts: a ring and a spring. The spring is fixed to the top of the cylinder 54 and is used to support the ring.

[0074] By adopting the above scheme, through the cooperation between the cylinder 54 and the inner wall of the shell 11, when the boss 52 slides inside the guide groove 55, the boss 52 is prevented from driving the cylinder 54 to rotate. When the spline at the top of the cutter head 12 moves down to contact the elastic ring 56, the rotating annular ring 31 can make the elastic block 42 snap into the conical groove 23 to fix the cutter head 12. At this time, the upward movement of the cylinder 54 will cause the spring of the elastic ring 56 to be compressed and accumulate force. Even if the weight of the cutter head 12 itself will cause the elastic ring 56 to move down and the conical groove 23 cannot be accurately at the same height as the elastic block 42, the conical design of the conical groove 23 has a fault tolerance rate to ensure that the elastic block 42 can be snapped into the conical groove 23.

[0075] The working principle and use process of the present invention:

[0076] First, the operator presses the elastic block 1 21 to release the elastic block 2 2 from fixing the tapered groove 23. At this time, the conical part of the elastic block 42 supports the cutter head 12. Then, the operator installs the housing 11 on the machine tool first, and then moves the paddle 34 to rotate the inclined block 33 to squeeze the square groove 44, so that the counterweight block 43 moves toward the cutter head 12 and the arc connecting rod 41 rotates to drive the elastic block 42 away from the cutter head 12. At this time, the cutter head 12 falls due to gravity. When the inclined block 33 passes through the square groove 44, the elastic block 42 will be reset under the elastic force of the spring 421, and the conical part of the elastic block 42 will be stuck in the tapered groove 23 and fix the cutter head 12, and the counterweight block 43 will also be reset;

[0077] When the machine tool drives the device to rotate, since the mass of the elastic block 42 is smaller than the counterweight block 43, and the counterweight block 43 is at the force-saving arm, the counterweight block 43 tends to move away from the cutter head 12 under the action of centrifugal force, and the elastic block 42 tends to move toward the cutter head 12, so that the device has a good fixation effect on the cutter head 12;

[0078] When the cutter head 12 falls under the action of gravity, its top contacts the elastic ring 56 and stops descending. The rotation of the paddle 34 will also drive the disk block 51 and the boss 52 to rotate through the protrusion 35, so that the boss 52 slides in the guide groove 55 and forces the cylinder 54 to move upward. At this time, since the elastic block 42 is stuck in the cutter head 12, the spring under the elastic ring 56 will be compressed and accumulate force. When the cutter head 12 needs to be reset, the three counterweight blocks 43 are pressed, and the elastic block 42 is separated from the fixation of the cutter head 12 through the arc connecting rod 41. At this time, the cutter head 12 will be squeezed upward by the elastic force of the elastic ring 56 and re-fixed by the elastic block 22. At the same time, the annular ring 31 will be reset under the action of the arc spring.

[0079] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0080] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A numerical control tool for precision machining of aerospace titanium alloy parts, comprising a tool assembly (1), the tool assembly (1) including a housing (11) and a tool head (12) with a spline-shaped top cross-section and adapted to the inner wall of the housing (11), characterized in that, Further included are; An elastic member (2) disposed on the top of the housing (11); An annular member (3) and a fixing assembly (4), both of which are movably installed at the bottom of the housing (11); Wherein, the housing (11) is elastically and fixedly connected with a first elastic block (21), a tapered groove (23) is annularly arrayed on the outer periphery of the cutter head (12), and a second elastic block (22) that can be snapped into the inside of the tapered groove (23) is elastically connected inside the housing (11); The fixing assembly (4) includes arc-shaped connecting rods (41) that are circumferentially arrayed and hinged to the bottom of the housing (11), an elastic clamping block (42) and a counterweight block (43) that are movably installed inside the housing (11) are respectively hinged at both ends of the arc-shaped connecting rod (41), one end of the elastic clamping block (42) is fixedly connected with a spring piece (421) located inside the housing (11) and props up the elastic clamping block (42) to have a tendency to move towards the cutter head (12), and a square groove (44) is opened inside the counterweight block (43); The annular member (3) includes an annular ring (31) sleeved on the bottom of the housing (11), and three inclined blocks (33) are fixedly connected to the inner wall of the annular ring (31); Press the first elastic block (21) to lower the housing (11) and then install the cutter head (12) on the machine tool. Subsequently, when the annular ring (31) rotates to drive the dial (34) to rotate, the inner wall of the square groove (44) is squeezed, and the counterweight block (43) moves towards the cutter head (12). At the same time, the arc-shaped connecting rod (41) rotates and drives the elastic clamping block (42) away from the cutter head (12); The housing (11) descends to the bottom, continue to rotate the annular ring (31) until the inclined block (33) completely passes through the square groove (44) and then stop. At this time, the elastic clamping block (42) moves towards the cutter head (12) under the elastic force of the spring piece (421) and fixes it.

2. The CNC cutting tool for precision machining of aerospace titanium alloy parts according to claim 1, wherein: A gap is left between the bottom of the first elastic block (21) and the top of the cutter head (12), and the part of the second elastic block (22) snapped into the tapered groove (23) is dome-shaped.

3. The CNC tool for precision machining of aerospace titanium alloy parts according to claim 1, characterized in that: The fixing assembly (4) further includes arc-shaped grooves (411) opened at both ends of the arc-shaped connecting rod (41), and the middle of the elastic clamping block (42) and one end of the counterweight block (43) located inside the arc-shaped groove (411) can both slide inside the corresponding arc-shaped groove (411).

4. The numerically controlled cutting tool for precision machining of aerospace titanium alloy parts according to claim 3, characterized in that: The distance from the hinge joint of the counterweight block (43) and the arc-shaped connecting rod (41) to the axis of the arc-shaped connecting rod (41) is greater than the distance from the hinge joint of the elastic clamping block (42) and the arc-shaped connecting rod (41) to the arc-shaped connecting rod (41). The end of the elastic clamping block (42) facing the housing (11) is conical and can be snapped into the tapered groove (23), and the mass of the counterweight block (43) is greater than that of the elastic clamping block (42).

5. The CNC tool for precision machining of aerospace titanium alloy parts according to claim 1, characterized in that: The middle of the inclined block (33) is an arc-shaped surface concentric with the housing (11), and the inclined block (33) is also provided with a vertical surface. When the inclined block (33) passes through the square groove (44), when the elastic clamping block (42) is reset under the elastic force, the counterweight block (43) is driven to reset through the arc-shaped connecting rod (41). At this time, the vertical surface at the inclined block (33) abuts against the counterweight block (43).

6. The CNC tool for precision machining of aerospace titanium alloy parts according to claim 1, characterized in that: The annular member (3) further includes three convex blocks (35) fixedly connected to the top of the annular ring (31); Three paddles (34) annularly arrayed on the outer periphery of the annular ring (31); An arc-shaped spring rod (32) arranged inside the paddle (34); The arc-shaped spring rod (32) consists of an arc-shaped rod and an arc-shaped spring. The arc-shaped rod is movably sleeved inside the paddle (34) and its two ends are fixedly connected to the outer shell (11). The arc-shaped spring is fixedly connected to the inner wall of the outer shell (11) and is used to support the paddle (34).

7. The CNC cutting tool for precision machining of aerospace titanium alloy parts according to claim 6, characterized in that: The bottom of the outer shell (11) is also movably connected with a reset assembly (5) located above the annular part (3). The reset assembly (5) includes a disk block (51) that can rotate inside the outer shell (11); A cylinder (54) sleeved inside the disk block (51) and outside the cutter head (12); An elastic ring (56) fixedly connected to the top of the cylinder (54); A guiding groove (55) is circumferentially arrayed and opened on the outer periphery of the cylinder (54). A convex column (52) that can slide inside the guiding groove (55) is fixedly connected to the disk block (51). A notch (53) that cooperates and engages with the convex block (35) is also opened on the disk block (51); When the paddle (34) rotates, it drives the convex column (52) to slide inside the guiding groove (55) through the disk block (51), and forces the cylinder (54) to move upward to squeeze the elastic ring (56).

8. The NC tool for precision machining of aerospace titanium alloy parts according to claim 7, wherein: The cross-section of the top of the cylinder (54) is spline-shaped and cooperates with the inner wall of the outer shell (11), so that the cylinder (54) can only slide up and down inside the outer shell (11).

9. The CNC tool for precision machining of aerospace titanium alloy parts according to claim 8, wherein: When the spline part at the top of the cutter head (12) moves downward to contact the elastic ring (56), the conical groove (23) and the elastic block (42) are at the same height.

10. The CNC cutting tool for precision machining of aerospace titanium alloy parts according to claim 9, characterized in that: The elastic ring (56) includes two parts, a circular ring and a spring. The spring is fixedly connected to the top of the cylinder (54) and is used to support the circular ring.

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