CN217192638U

CN217192638U - Major diameter adjustable fine boring cutter

Info

Publication number: CN217192638U
Application number: CN202220234949.8U
Authority: CN
Inventors: 陈亮; 潘康; 孟繁强
Original assignee: Bestool Tool Manufacturing Co ltd
Current assignee: Bestool Tool Manufacturing Co ltd
Priority date: 2022-01-28
Filing date: 2022-01-28
Publication date: 2022-08-16
Anticipated expiration: 2032-01-28

Abstract

The application provides a finish boring sword with adjustable major diameter includes: the tool apron is provided with an installation end surface connected with external equipment, the external equipment can drive the tool apron to rotate, and the direction of a rotating shaft of the external equipment is a first direction; a first mounting surface is arranged at one end of the tool apron, which is relatively far away from the mounting end surface; the two sides of the first mounting surface in the first direction are provided with a counterweight part and an assembling part which have the same weight, and the assembling part is used for mounting the blade; the distance adjusting part is arranged in the tool apron and used for driving the counterweight part and the assembling part to slide along a second direction, and the second direction is perpendicular to the first direction so as to adjust the vertical distance from the gravity center of the counterweight part and the assembling part to the first direction; and the diameter adjusting part is arranged in the assembling part and is used for adjusting the vertical distance from the blade to the first direction. The vertical distance from the blade to the axis of the cutter body is finely adjusted through the diameter adjusting part, and then the hole diameter of the drilled hole is finely adjusted. The vertical distance between the blade and the axis of the cutter body is adjusted twice, so that the cutting precision of the boring cutter is improved.

Description

Major diameter adjustable fine boring cutter

Technical Field

The application relates to the technical field of machining of holes in machining, in particular to a large-diameter adjustable fine boring cutter.

Background

At present, the boring cutter products in domestic markets have very large demand, and the boring cutter is an irreplaceable product for a machining hole processing scheme. With the increasing requirements of customers on improving the production efficiency and reducing the cost, the precision boring cutters in the society are different in high precision and stability, and the high-precision boring cutter products are mainly embodied in precision control and stability.

The diameter of the fine boring cutter is adjusted by adjusting the distance between the cutter holder and the axis of the cutter body, so that different drilling requirements are met, the accuracy cannot meet the requirement in the traditional method for adjusting the diameter of the fine boring cutter, the cutter adjusting time is increased for a client in use, the risk of part out-of-tolerance is easily caused, and the production efficiency is reduced. This is a significant departure from the goal of customers to increase production efficiency.

Disclosure of Invention

In view of the above-mentioned drawbacks or deficiencies in the prior art, the present application aims to provide a large-diameter adjustable fine boring tool, comprising:

the tool apron is provided with an installation end face connected with external equipment, the external equipment can drive the tool apron to rotate, and the direction of a rotating shaft of the external equipment is a first direction; a first mounting surface is arranged at one end of the tool apron, which is relatively far away from the mounting end surface;

a counterweight part and an assembling part which have the same weight are arranged on the first mounting surface and on two sides of the first direction, and the assembling part is used for mounting a blade;

the distance adjusting part is arranged in the tool apron and used for driving the counterweight part and the assembling part to slide along a second direction, and the second direction is perpendicular to the first direction so as to adjust the vertical distance from the gravity center of the counterweight part and the assembling part to the first direction;

and the diameter adjusting part is arranged in the assembling part and is used for adjusting the vertical distance from the blade to the first direction.

According to the technical scheme provided by the embodiment of the application, the counterweight part comprises: the first sliding block and the balancing weight are arranged on the first sliding block; the fitting portion includes: the structure of the second sliding block is the same as that of the first sliding block, and the cutter head part is arranged on the second sliding block; the blade is arranged on the knife head part.

According to the technical scheme provided by the embodiment of the application, the distance adjusting part comprises: locate run through on the first installation face the logical groove of blade holder, the axis direction that leads to the groove is on a parallel with the second direction, first slider with the second slider is close to relatively the blade holder side is equipped with the butt post, the one end of butt post is located lead to the inslot, the both ends that lead to the groove are equipped with adjusting screw respectively, adjusting screw with butt post butt can drive the butt post drives first slider with the second slider is followed the second direction removes.

According to the technical scheme provided by the embodiment of the application, the cutter head part comprises:

one end of the cutter body is fixed to the second sliding block and is provided with a center line perpendicular to the second direction, and the direction of the center line is a third direction;

the movable shaft is arranged in the cutter body, the axis direction of the movable shaft is a fourth direction, and the fourth direction is perpendicular to the third direction; a first surface is formed on the periphery of the movable shaft by cutting; a first groove is formed in one end of the movable shaft, and the axis of the first groove is in the fourth direction;

the anti-rotation body penetrates through and is fixed on the cutter body and is provided with a second surface attached to the first surface, the second surface is a wedge-shaped surface, and the extending direction of the second surface is perpendicular to the fourth direction;

the tool holder is arranged outside the tool body, is fixed at one end of the movable shaft, which is relatively far away from the first groove, and is used for mounting the blade;

the diameter adjusting part is provided with a screw rod which is arranged in the first groove and is in threaded connection with the movable shaft; when the screw rod rotates, the movable shaft is driven to move along the fourth direction.

According to the technical scheme provided by the embodiment of the application, the diameter adjusting part further comprises a protruding part formed by extending the screw rod outwards relative to the outer wall far away from the knife clamp end, and the protruding part is arranged outside the knife body; the projection may prevent the screw from moving in the fourth direction.

According to the technical scheme provided by the embodiment of the application, the cutter body is penetrated and provided with the locking screw, and the locking screw abuts against the movable shaft and is used for fixing the movable shaft after the precision is adjusted.

According to the technical scheme that this application embodiment provided, the inside distribution of blade holder has the delivery route, be close to on the cutter body blade department is equipped with a plurality of apopores.

According to the technical scheme that this application embodiment provided, first slider with follow on the second slider be equipped with waist type hole, first installation face go up with the position that waist type hole is relative is equipped with the bolt hole, waist type downthehole be equipped with the T type screw that the bolt hole matches, T type screw be used for with first slider or the second slider with the blade holder is fastened in advance.

According to the technical scheme provided by the embodiment of the application, the side wall of the cutter holder is provided with main scale marks, and the first sliding block or the second sliding block is provided with a first auxiliary marking line matched with the main scale marks.

According to the technical scheme that this application embodiment provided, the screw rod is kept away from relatively the cutter holder pot head is equipped with the calibrated scale, the cutter body outer wall be equipped with the vice marking of second that the calibrated scale matches.

In summary, the present application provides a large-diameter adjustable fine boring tool, wherein a tool apron of the large-diameter adjustable fine boring tool has an installation end surface connected to an external device, the external device can drive the tool apron to rotate, and a direction of a rotating shaft of the external device is a first direction; the tool apron is provided with the counterweight part and the assembling part which are the same in weight, the blade is arranged on the assembling part, and the counterweight part and the assembling part are driven by the distance adjusting part to slide towards or away from the first direction; the vertical distance from the blade to the rotating shaft of the tool apron is finely adjusted through the diameter adjusting part, and then the hole diameter of the drilled hole is finely adjusted. The vertical distance from the blade to the rotating shaft of the tool apron is adjusted twice, so that the precision of boring cutter cutting is improved, and in addition, when the cutting is rotated at high speed by taking the rotating shaft of the tool apron as a center, the distances from the counterweight parts and the assembling parts, which are equal in weight on two sides of the axis, to the rotating shaft of the tool apron are equal, so that the cutting stability is improved.

Drawings

Fig. 1 is a schematic structural diagram of a large-diameter adjustable fine boring tool according to an embodiment of the present disclosure;

fig. 2 is a schematic bottom view of a large-diameter adjustable fine boring tool according to an embodiment of the present disclosure;

fig. 3 is a cross-sectional view a-a of fig. 2.

The text labels in the figures are represented as:

1. a tool apron; 11. mounting an end face; 12. a first mounting surface; 13. a through groove; 14. bolt holes; 131. a first through groove; 132. a second through groove; 2. a counterweight portion; 21. a first slider; 22. a balancing weight; 3. an assembling portion; 31. a second slider; 32. a cutter head portion; 321. a cutter body; 322. a movable shaft; 3221. a first surface; 3222. a first groove; 3223. a second groove; 323. rotation prevention; 3231. a second surface; 324. a tool holder; 325. locking the screw; 4. a blade; 41. a water outlet hole; 51. a butting post; 52. an adjusting screw; 61. a screw; 62. a boss portion; 63. a copper nut; 7. a kidney-shaped hole; 71. a T-shaped screw; 8. a main scale line; 9. a dial.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

As mentioned in the background art, the present application proposes, in view of the problems in the prior art, a large-diameter adjustable fine boring tool, as shown in fig. 1, comprising:

the tool apron comprises a tool apron 1 and a tool post, wherein the tool apron 1 is provided with an installation end surface 11 connected with external equipment, the external equipment can drive the tool apron 1 to rotate, and the direction of a rotating shaft of the external equipment is a first direction; a first mounting surface 12 is arranged at one end of the tool apron 1 relatively far away from the mounting end surface 11; preferably, the holder 1 is oval, and the rotation axis of the holder 1 is the axis of the holder;

a counterweight part 2 and an assembling part 3 with the same weight are arranged on the first mounting surface 12 on two sides in the first direction, and the assembling part 3 is used for mounting a blade 4; when the external equipment drives the tool apron 1 to drive the blade 4 to rotate at a high speed, chip drilling can be finished;

the distance adjusting part is arranged in the tool apron 1 and used for driving the counterweight part 2 and the assembling part 3 to slide along a second direction, and the second direction is perpendicular to the first direction so as to adjust the vertical distance from the gravity center of the counterweight part 2 and the assembling part 3 to the first direction;

and the diameter adjusting part is arranged in the assembling part 3 and is used for adjusting the vertical distance from the blade 4 to the axis of the tool apron 1.

The counterweight part 2 and the assembling part 3 are driven by the distance adjusting part to slide towards the direction close to or far away from the axis of the tool apron 1, on one hand, the vertical distance between the blade 4 on the assembling part 3 and the axis of the tool apron 1 can be adjusted to adjust the aperture of a drilled hole, on the other hand, the vertical distances between the gravity center of the assembling part 3 and the axis of the tool apron 1 can be adjusted to be equal, and the phenomenon of deflection caused by the high-speed rotation of the tool apron 1 is prevented from causing the risk of excessive parts; and the vertical distance from the blade 4 to the axis of the tool apron 1 is finely adjusted through the diameter adjusting part, so that the hole diameter of the drilled hole is finely adjusted. The precision of the boring cutter cutting is improved by adjusting the vertical distance between the blade 4 and the axis of the tool apron 1 twice, and in addition, when the cutting is rotated at high speed by taking the axis of the tool apron 1 as a center through the distance adjusting part, the distances from the counterweight part 2 and the assembling part 3 with equal weights on two sides to the axis are equal, so that the cutting stability is improved.

Further, the weight 2 includes: a first slide block 21 and a balancing weight 22 arranged on the first slide block 21; the fitting portion 3 includes: a second slide block 31 with the same structure as the first slide block 21 and a cutter head part 32 arranged on the second slide block 31; the blade 4 is provided at the head portion 32. Specifically, the first slider 21 and the second slider 31 have the same structure and the same weight, and are symmetrically arranged with respect to the first direction, the end surfaces of the first slider 21 and the second slider 31, which are relatively far away from the tool apron 1 side, are provided with mounting holes for mounting the counterweight 22 and the tool head 32, and the distances from the positions of the two mounting holes to the first direction are equal; preferably, the weight member 22 and the tool head 32 are cylinders having approximately the same shape, and are fixed to the mounting holes by bolts, so that when different boring tools are used, the stability of chips can be ensured by replacing the weight member 22 having the same weight. The replacement is simple, the tool apron and the sliding block can be repeatedly used, and the cost is saved.

Further, the pitch adjusting portion includes: locate run through on the first installation face 12 blade holder 1's logical groove 13, the axis direction that leads to groove 13 is on a parallel with the second direction, first slider 21 with second slider 31 is close to relatively blade holder 1 side is equipped with butt post 51, the one end of butt post 51 is located lead to in the groove 13, the both ends that lead to the groove 13 are equipped with adjusting screw 52 respectively, adjusting screw 52 with butt post 51 butt and can drive butt post 51 drives first slider 21 with second slider 31 is followed the second direction removes.

The through groove 13 includes a first through groove 131 and a second through groove 132 opposite to the first slider 21 and the second slider 31, the first through groove 131 penetrates through the outer wall of the tool holder 1 from the side of the axis of the tool holder 1 relatively close to the first slider 21, the second through groove 132 penetrates through the outer wall of the tool holder 1 from the side of the axis of the tool holder 1 relatively close to the second slider 31, and the first through groove 131 and the second through groove 132 are not communicated with each other. The inner walls of the first through groove 131 and the second through groove 132 are provided with threads matched with the adjusting screws 52, and the two adjusting screws 52 extend into the first through groove 131 and the second through groove 132 from two sides of the tool holder 1, so as to drive the abutting column 51 to move along the second direction, thereby realizing that the first slider 21 and the second slider 31 move along the second direction.

Further, the cutter head portion 32 includes:

a cutter body 321, one end of the cutter body 321 being fixed to the second slider 31, and having a center line perpendicular to the second direction, the center line being in a third direction; preferably, in this embodiment, the cutter body 321 is approximately an outer cylinder, and the axis thereof is the center line;

the movable shaft 322 is disposed in the cutter body 321, and an axial direction of the movable shaft is a fourth direction, and the fourth direction is perpendicular to the third direction; the outer circumferential surface of the movable shaft 322 is chip-formed with a first surface 3221; a first groove 3222 is formed at one end of the movable shaft 322, and an axis of the first groove 3222 is in the fourth direction; preferably, the movable shaft 322 is a cylinder, the first groove 3222 is a cylindrical groove, and an inner wall of the groove is provided with threads;

the rotation preventing body 323 penetrates through and is fixed on the cutter body 321, and is provided with a second surface 3231 attached to the first surface 3221, wherein the second surface 3231 is a wedge-shaped surface, and the extending direction of the wedge-shaped surface is perpendicular to the fourth direction;

a holder 324, disposed outside the cutter body 321, fixed to an end of the movable shaft 322 opposite to the first groove 3222, for mounting the insert 4;

the diameter adjusting part is provided with a screw rod 61 which is arranged in the first groove 3222 and is in threaded connection with the movable shaft 322; when the screw rod 61 rotates, the movable shaft 322 is driven to move along the fourth direction.

When the screw 61 rotates, the rotation preventing body 323 prevents the movable shaft 322 from rotating, so that the movable shaft 322 moves in the fourth direction, thereby achieving that the tool holder 324 mounted at one end of the movable shaft 322 moves in a direction approaching or separating from the tool body 321, and further achieving the adjustment of the vertical distance from the insert 4 to the axis of the tool holder 1; since the second surface 3231 is a wedge-shaped surface, the extending direction of the second surface 3231 is perpendicular to the fourth direction, and the first surface 3221 and the second surface 3231 are attached to each other, the first surface 3221 and the second surface 3231 are inclined surfaces with complementary angles, and since the area of the inclined surfaces is larger than that of the flat surfaces, the contact area between the anti-rotation body 323 and the movable shaft 322 is increased, and the structural stability is improved.

Further, the diameter adjusting part further comprises a protruding part 62 formed by extending the screw 61 outwards relative to the outer wall of the end far away from the holder 324, and the protruding part 62 is arranged outside the cutter body 321; the projection 62 prevents the screw 61 from moving in the fourth direction.

Specifically, the outer wall of the cutter body 321 is provided with a circular hole on the side opposite to the tool holder 324, the circular hole is coaxially arranged with the movable shaft 322, the inner diameter of the circular hole is approximately equal to the outer diameter of the screw rod 61, the outer diameter of the boss 62 of the screw rod 61 is larger than the circular hole, so that during assembly, the screw rod 61 passes through the circular hole to be in threaded connection with the movable shaft 322, and the boss 62 is left outside the cutter body 321, so that during rotation of the screw rod 61, the screw rod 61 can only rotate in situ due to the restriction of the boss 62. In this embodiment, a copper nut 63 is disposed in the first groove 3222, an outer wall of the copper nut 63 is fixed to an inner wall of the first groove 3222 through glue, that is, the copper nut 63 is fixedly connected to the movable shaft 322, a thread engaged with the screw 61 is disposed on the inner wall of the copper nut 63, and when the screw 61 rotates, the copper nut 63 is driven to move along the second direction, so that the copper nut 63 drives the movable shaft 322 to move along the second direction.

Preferably, a second groove 3223 is formed in the outer peripheral surface of the movable shaft 322, the second groove 3223 has two opposite side walls, and the surfaces of the two side walls are perpendicular to the fourth direction; the bottom surface of the second groove is the first surface 3221. Specifically, the two side walls are distributed and arranged along the fourth direction, and the rotation preventing body 323 is disposed in the second groove 3223, so that a stroke range of the movable shaft 322 moving along the fourth direction is defined between the two side walls.

Further, as shown in fig. 1, a locking screw 325 is further disposed through the cutter body 321, and the locking screw 325 abuts against the movable shaft 322 to fix the movable shaft 322 after precision adjustment. Optionally, the locking screw 325 is a ball screw, a contact surface with the movable shaft 322 is a plane, a third groove is further formed in the circumferential surface of the movable shaft, a bottom surface of the third groove is also a plane, the locking screw 325 penetrates through the cutter body 321 to abut against the bottom surface of the third groove, and the contact area is increased due to the surface-to-surface contact, so that the stability of fixing the movable shaft 322 is improved; in addition, after the vertical distance between the blade 4 and the axis of the tool apron 1 is adjusted, the movable shaft 322 is fixed through the locking screw 325, so that the stability of cutting chips of the blade 4 is improved when the tool apron 1 rotates.

Furthermore, water outlet paths are distributed in the tool apron 1, and a plurality of water outlet holes 41 are formed in the tool body 321 near the blade 4. When the blade holder 1 drives the blade 4 to rotate, the temperature rise caused by overlarge friction resistance and the poor cooling condition can be effectively reduced, and then the plastic slag generated by high-temperature hot melting of cutting scraps is prevented.

Furthermore, waist-shaped holes 7 are formed in the first slider 21 and the second slider 31 along the second direction, bolt holes 14 are formed in the first mounting surface 12 at positions opposite to the waist-shaped holes 7, T-shaped screws 71 matched with the bolt holes 14 are arranged in the waist-shaped holes 7, and the T-shaped screws 71 are used for pre-fastening the first slider 21 or the second slider 31 to the tool apron 1. Specifically, the waist-shaped hole 7 is a long strip-shaped hole, the length direction of the long strip-shaped hole is parallel to the second direction, when the first slider 21 or the second slider 31 is pre-fastened with the tool holder 1, the head of the T-shaped screw 71 is located above a boss in the waist-shaped hole 7, and the T-shaped screw 71 is an inner hexagon bolt; the substantial position of the blade 4 can be fixed by the pre-fastening, and after the pre-fastening, the position accuracy of the blade 4 is adjusted by the distance adjusting part and the diameter adjusting part.

Furthermore, the side wall of the tool apron 1 is provided with a main scale mark 8, and the first sliding block 21 or the second sliding block 31 is provided with a first auxiliary scale mark matched with the main scale mark 8. When the first slide block 21 or the second slide block 31 is relatively close to each other, the adjustment amount can be seen through the main scale mark 8, and a reference value is provided for the adjustment of the blade 4, so that the adjustment is more accurate.

Furthermore, the screw 61 is sleeved with a dial 9 relatively far away from the tool holder 324, and the outer wall of the cutter body 321 is provided with a second auxiliary marking matched with the dial 9. Specifically, the dial 9 is disposed relatively close to the first groove 3222 and exposed outside the cutter body 321, and preferably, the dial 9 is in threaded connection with the screw 61 and fixed by glue, and when the screw 61 rotates, the dial 9 rotates therewith. Cutter body 321 outer wall the circumference of calibrated scale 9 is equipped with the vice marking of second, be equipped with main marking on the calibrated scale 9, through the cooperation of main, vice marking, and first surface 3221 with the locking structure of second surface 3231, the regulation precision of finish boring sword can reach 0.002mm, and can embody the regulating value directly perceived through the marking during the regulation.

The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. The foregoing is only a preferred embodiment of the present application, and it should be noted that there are no specific structures which are objectively limitless due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes can be made without departing from the principle of the present invention, and the technical features mentioned above can be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention in other instances, which may or may not be practiced, are intended to be within the scope of the present application.

Claims

1. The utility model provides a fine boring cutter with adjustable major diameter which characterized in that includes:

the tool apron comprises a tool apron (1) and a tool post, wherein the tool apron (1) is provided with an installation end surface (11) connected with external equipment, the external equipment can drive the tool apron (1) to rotate, and the direction of a rotating shaft of the external equipment is a first direction; a first mounting surface (12) is arranged at one end, relatively far away from the mounting end surface (11), of the tool apron (1);

a counterweight part (2) and an assembling part (3) with the same weight are arranged on the first mounting surface (12) at two sides in the first direction, and the assembling part (3) is used for mounting a blade (4);

the distance adjusting part is arranged in the tool apron (1) and used for driving the counterweight part (2) and the assembling part (3) to slide along a second direction, and the second direction is perpendicular to the first direction so as to adjust the vertical distance from the center of gravity of the counterweight part (2) and the assembling part (3) to the center line of the first direction;

and the diameter adjusting part is arranged in the assembling part (3) and is used for finely adjusting the vertical distance from the blade (4) to the first direction.

2. The large-diameter adjustable fine boring tool according to claim 1, wherein: the weight portion (2) includes: the device comprises a first sliding block (21) and a balancing weight (22) arranged on the first sliding block (21); the fitting portion (3) includes: a second sliding block (31) with the same structure as the first sliding block (21) and a cutter head part (32) arranged on the second sliding block (31); the blade (4) is arranged on the knife head part (32).

3. The large-diameter adjustable fine boring tool according to claim 2, wherein: the distance adjusting part includes: locate run through on first installation face (12) blade holder (1) lead to groove (13), the axis direction that leads to groove (13) is on a parallel with the second direction, first slider (21) with second slider (31) are close to relatively blade holder (1) side is equipped with butt post (51), the one end of butt post (51) is located lead to in the groove (13), the both ends that lead to groove (13) are equipped with adjusting screw (52) respectively, adjusting screw (52) with butt post (51) butt and can drive butt post (51) drive first slider (21) with second slider (31) are followed the second direction removes.

4. The large-diameter adjustable fine boring tool according to claim 2, wherein: the bit portion (32) includes:

the cutter body (321), one end of the cutter body (321) is fixed to the second slider (31), and the cutter body has a center line perpendicular to the second direction, and the direction of the center line is a third direction;

the movable shaft (322) is arranged in the cutter body (321), the axis direction of the movable shaft is a fourth direction, and the fourth direction is perpendicular to the third direction; a first surface (3221) is formed by cutting on the outer peripheral surface of the movable shaft (322); one end of the movable shaft (322) is provided with a first groove (3222), and the axis of the first groove (3222) is in the fourth direction;

the anti-rotation body (323) penetrates through and is fixed on the cutter body (321), the anti-rotation body is provided with a second surface (3231) attached to the first surface (3221), the second surface (3231) is a wedge-shaped surface, and the extending direction of the second surface is perpendicular to the fourth direction;

the cutter holder (324) is arranged outside the cutter body (321), is fixed at one end of the movable shaft (322) relatively far away from the first groove (3222) and is used for mounting the blade (4);

the diameter adjusting part is provided with a screw rod (61) which is arranged in the first groove (3222) and is in threaded connection with the movable shaft (322); when the screw rod (61) rotates, the movable shaft (322) is driven to move along the fourth direction.

5. The large-diameter adjustable fine boring tool according to claim 4, wherein: the diameter adjusting part also comprises a convex part (62) formed by extending the screw rod (61) outwards relative to the outer wall far away from the end of the cutter holder (324), and the convex part (62) is arranged outside the cutter body (321); the projection (62) may prevent the screw (61) from moving in the fourth direction.

6. The large-diameter adjustable fine boring tool according to claim 4, wherein: the cutter body (321) is penetrated by a locking screw (325), and the locking screw (325) abuts against the movable shaft (322) and is used for fixing the movable shaft (322) after the precision is adjusted.

7. The large-diameter adjustable fine boring tool according to claim 4, wherein: the cutter holder (1) is internally distributed with water outlet paths, and the cutter body (321) is provided with a plurality of water outlet holes (41) close to the blade (4).

8. The large-diameter adjustable fine boring tool according to claim 2, wherein: waist-shaped holes (7) are formed in the first sliding block (21) and the second sliding block (31) along the second direction, bolt holes (14) are formed in the positions, opposite to the waist-shaped holes (7), of the first mounting surface (12), T-shaped screws (71) matched with the bolt holes (14) are arranged in the waist-shaped holes (7), and the T-shaped screws (71) are used for pre-fastening the first sliding block (21) or the second sliding block (31) with the tool apron (1).

9. The large-diameter adjustable fine boring tool according to claim 2, wherein: the side wall of the tool apron (1) is provided with main scale marks (8), and the first sliding block (21) or the second sliding block (31) is provided with a first auxiliary scale line matched with the main scale marks (8).

10. The large-diameter adjustable fine boring tool according to claim 4, wherein: the screw rod (61) is relatively far away from the end sleeve of the tool holder (324) and is provided with a dial (9), and the outer wall of the tool body (321) is provided with a second auxiliary marking line matched with the dial (9).