CN110814369B

CN110814369B - Deviation-preventing type inner hole groove machining cutter assembly

Info

Publication number: CN110814369B
Application number: CN201911182920.9A
Authority: CN
Inventors: 吴伟国; 过如青
Original assignee: Wuxi Wierxun Fluid Control Technology Co ltd
Current assignee: Wuxi Wierxun Fluid Control Technology Co ltd
Priority date: 2019-11-27
Filing date: 2019-11-27
Publication date: 2021-04-02
Anticipated expiration: 2039-11-27
Also published as: CN110814369A

Abstract

The invention discloses a deviation-preventing type hole inner groove machining tool assembly which comprises a tool and a positioning mechanism, wherein the tool comprises a tool handle, a frustum is arranged at the front end of the tool handle, a positioning hole is formed in the front end surface of the frustum, an eccentric arc groove is formed in the front part of the tool handle, close to the frustum, of the tool handle, the top and the straight side of the eccentric arc groove are communicated with the outside, a limiting clamping groove for fixing a blade is formed in the eccentric arc groove, the blade is clamped in the limiting clamping groove and is in threaded connection with a threaded hole in the limiting clamping groove through a screw to be used for fixing the blade on the tool handle, one tool nose of the blade extends to the outside of the limiting clamping groove and forms a certain included angle with the side wall of the tool handle, the tool handle is fixed on a fixing mechanism of a lathe tailstock through a clamping sleeve, the positioning mechanism. In a word, the cutter has reasonable structural design and flexible use, and can greatly improve the qualification rate of the processed hole.

Description

Deviation-preventing type inner hole groove machining cutter assembly

Technical Field

The invention belongs to the technical field of machining, and particularly relates to an anti-deviation type hole inner groove machining cutter assembly.

Background

A tool is a tool commonly used in daily life, and a tool used for cutting machining in machine manufacturing is called a cutting tool, and most of the tools are used for machines, but are also used for hands.

In current machining operation, the work of machining a hole inner groove is often needed, and in the prior art, a cutter with a cutter head at the front end is mostly adopted for machining. For example, chinese utility model patent with application number CN201420243717.4 discloses a cutter of processing hole deep trouth, including the adapter sleeve that is used for being connected with the aircraft nose, with adapter sleeve looks fixed connection's core axle sleeve, slide along the length direction of core axle sleeve and set up the cutter arbor dabber in the core axle sleeve, set up the blade holder on the core axle sleeve along the radial slide of core axle sleeve, install the blade on the blade holder, set up the spring clamp dabber in core axle sleeve front end, set up the epaxial spring clamp cover of spring clamp, set up the spring clamp in the spring clamp cover, the front end of cutter arbor dabber has first inclined plane, the second inclined plane has on the blade holder, first inclined plane cooperatees with the second inclined plane.

However, in the machining process, because the hole to be machined is small, the cutter handle of the cutter is easy to swing and give way under high-speed rotation, the hole diameter of the inner groove is difficult to control, the size of the machined hole is prone to large deviation, the cutter head can be damaged, particularly, part machining is usually carried out in batch, the problem that the sizes of the inner grooves of all parts are inconsistent can be caused, the working difficulty is increased, the production efficiency is low, and the improvement of the productivity is severely restricted.

Disclosure of Invention

Aiming at the technical problems, the invention provides a tool assembly for machining an inner groove of an anti-deviation type hole.

The technical scheme of the invention is as follows: a tool assembly for processing an inner groove of an anti-deviation type hole comprises a tool and a positioning mechanism,

the cutter comprises a cutter handle, wherein a frustum is arranged at the front end of the cutter handle, a positioning hole is formed in the front end face of the frustum, an eccentric arc groove is formed in the front part of the cutter handle, which is close to the frustum, the top and the straight side of the eccentric arc groove are communicated with the outside, a limiting clamping groove for fixing the blade is formed in the eccentric arc groove, the blade is clamped in the limiting clamping groove and is in threaded connection with a threaded hole in the limiting clamping groove through a screw to fix the blade on the cutter handle, one tool nose of the blade extends to the outside of the limiting clamping groove and forms a certain included angle with the side wall of the cutter handle, and the tail of the cutter handle is;

the positioning mechanism comprises a workpiece fixing seat and a positioning fixing seat which are installed on a lathe, the workpiece is clamped on the workpiece fixing seat, the center of a hole to be machined of the workpiece is opposite to the axis of the cutter handle, a telescopic positioning device is clamped on the positioning fixing seat, the front end of the telescopic positioning device is provided with a rotating head, and the rotating head is butted with a positioning hole at the front end of the frustum in the hole to be machined.

Further, spacing draw-in groove includes the first straight line section that forms certain contained angle with eccentric arc groove straight flange one side, this contained angle generally equals the acute angle of blade, first straight line section is used for offsetting with a side of blade, still including connecting on first straight line section, first circular arc section and the second circular arc section of lower extreme, first circular arc section is used for holding an acute angle knife tip that the blade inwards, second circular arc section is used for holding an obtuse angle position of blade, the dismantlement and the installation of blade can be convenient for in the space that two circular arc sections and blade formed, adaptability is stronger simultaneously, can the multiple different reaming sizes of centre gripping blade. The second straight line section is perpendicular to one side of the straight edge of the eccentric arc groove and connected to the first arc section, and the third straight line section is perpendicular to one side of the straight edge of the eccentric arc groove and connected to the second arc section, and is used for limiting the position of the blade and preventing the blade from deviation caused by rotation. An opening structure communicated with the outside is formed between the second straight line section and the third straight line section, so that a tool tip can extend out conveniently, and compared with a limiting groove completely matched with the blade structure, the multi-line-section irregular line is more convenient and practical by adopting the multi-line-section irregular line.

Furthermore, the blade is of a diamond structure, acute angle parts at two ends of the blade are tool tips, a through hole is formed in the center of the blade, and a screw penetrates through the through hole and extends into the threaded hole. The blade with the diamond structure is provided with two acute-angle tool tips which can be alternately used, so that the service life of the blade is prolonged.

Further, the work piece fixing base is including installing fixed block one on the lathe, set up U type groove on the fixed block one and divide into two parts from top to bottom with fixed block one, be equipped with opening blind hole thread groove up in the lower part fixed block one, be equipped with the regulation supporting screw in the blind hole thread groove, can adjust from top to bottom and ensure that the rotating head and the frustum of treating the processing hole center and the flexible positioner front end of work piece are located same water flat line, the top of regulation supporting screw is equipped with the fixation clamp seat, the work piece is placed on the fixation clamp seat, vertically be equipped with on the upper part fixed block one and run through the screw hole, it is equipped with the pretension screw who is used for adjusting fixed work piece to run through the threaded hole, a work piece is fixed, take place not hard.

Further, the location fixing base is including installing on the lathe and being located the fixed block two of fixed block one rear side, and the front side of fixed block two is opened and is equipped with the fixed slot that is used for fixed flexible positioner, is equipped with a plurality of mounting holes around the fixed slot.

Furthermore, flexible positioner includes that the afterbody fixes the location shoulder in the fixed slot and is located the location axostylus axostyle of location shoulder front end, be equipped with on the location shoulder be used for passing through bolt fixed connection's ring flange with the mounting hole, the inside displacement hole that is equipped with of location shoulder, the side in displacement hole is equipped with the spacing groove, the back end of location axostylus axostyle is located the displacement downthehole and can radially twitch, the afterbody of location axostylus axostyle is equipped with the spacing boss with the spacing groove adaptation, be connected through compression spring between the afterbody of location axostylus axostyle and the interior bottom in displacement hole, the head of location.

Furthermore, an elastic inner liner is arranged inside the clamping sleeve and fixedly connected with the clamping sleeve through a rivet. The rubber material can be chooseed for use to the elasticity inner liner to can connect fixed back on the telescopic inner wall of centre gripping through the mode that splices earlier, adopt the rivet to follow the outside nail of centre gripping sleeve to the interior nothing of elasticity inner liner and pierce through for further fixed. The elastic inner liner layer made of rubber can increase the friction force between the blade and the knife handle, so that the phenomenon of slipping is prevented, and meanwhile, the shaking caused by rotation of the part can be offset.

Furthermore, the tail of the tool shank is used for being connected with a connecting hole of a blind rivet, and the blind rivet penetrates through the bottom of the clamping sleeve and is fixed through a nut located on the outside. The tool shank and the clamping sleeve can be further fixed.

The working method of the invention is as follows: the first step, a first fixing block and a second fixing block are installed on a lathe, a positioning shaft shoulder is placed in a fixing groove of the second fixing block, and a flange on the positioning shaft shoulder is fixedly connected with an installation hole of the second fixing block through a bolt, so that the tip end of a positioning shaft rod faces the first fixing block; secondly, placing the workpiece on a fixed clamping seat, adjusting the height of the workpiece through an adjusting support screw rod to enable the circle center of a hole to be machined of the workpiece to be opposite to the axis of the positioning shaft rod, and screwing down a pre-tightening screw rod to pre-tighten the workpiece; and thirdly, placing the blade in a limiting clamping groove, after adjusting the position and the angle, utilizing a screw to penetrate through a through hole in the blade and be fixedly connected with a threaded hole in the limiting clamping groove, then sleeving a clamping sleeve at the tail part of the cutter handle in a rotating mode, fixing the cutter handle on a three-jaw chuck of a lathe tailstock, adjusting the position of the cutter away from the workpiece, abutting a tip part of a rotating head at the front end of a positioning shaft rod against a positioning hole at the front end of a frustum in a hole to be processed in the workpiece, feeding the cutter handle forwards by the machine tool until the cutter point of the blade is aligned with the workpiece, opening the three-jaw chuck of the machine tool to drive the cutter handle to rotate, reaming the workpiece, supporting the frustum at the front end of the cutter handle and the rotating head at the front end of the positioning shaft rod, and effectively preventing errors caused by swinging of. Along with the forward feeding of handle of a knife, the location axostylus axostyle receives the extrusion, progressively retreats along the displacement hole under compression spring's buffering, guarantees going on smoothly of course of working, has also guaranteed reaming quality simultaneously, and the sweeps of cutting away follow the discharge of eccentric arc groove.

The invention has the beneficial effects that:

(1) according to the cutter, the eccentric arc groove is formed in one side of the front end of the cutter handle, so that enough discharge space is reserved for waste residues in the cutting process, the reduction of the processing quality of a workpiece caused by accumulation of the waste residues is prevented, and meanwhile, the blade can be protected from being damaged.

(2) Compared with the limit groove which is completely matched with the blade structure, the irregular limit clamping groove is arranged, so that the function of clamping and limiting the blade can be realized, the blade can be conveniently installed and replaced, and the cutter is more convenient and practical.

(3) The blade with the diamond structure has two acute-angle tool points, can be used alternately, and prolongs the service life of the blade.

(4) The front end of the cutter handle is also provided with the positioning hole, the rotating head at the front end of the positioning shaft lever is used for abutting against the positioning hole in the using process, and a supporting force is formed at the front end of the cutter handle, so that the cutter handle can be prevented from shaking in the rotating process to cause large errors of a processed hole.

In a word, the cutter has reasonable structural design and flexible use, and can greatly improve the qualification rate of the processed hole.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the construction of the tool of the present invention;

FIG. 3 is a schematic view of the invention taken from the direction A in FIG. 2;

FIG. 4 is a schematic structural view of a limiting slot of the present invention;

FIG. 5 is a schematic view of the construction of the blade of the present invention;

fig. 6 is a schematic view of the structure of a tool with a blind rivet in embodiment 2 of the present invention.

The cutting tool comprises a cutting tool 1, a cutting tool handle 11, a pull nail 111, a connecting hole 112, a nut 113, a frustum 12, a positioning hole 13, an eccentric arc groove 14, a blade 15, a through hole 151, a limiting clamping groove 16, a first straight line segment 161, a first arc segment 162, a second arc segment 163, a second straight line segment 164, a third straight line segment 165, a clamping sleeve 17, an elastic lining layer 171, a rivet 172, a threaded hole 18, a screw 180, a positioning mechanism 2, a workpiece fixing seat 21, a fixing block 211, a fixing block I211 a, a fixing block I on the lower portion, a fixing block I on the upper portion 211b, a fixing block I212-U-shaped groove 212, a blind hole thread groove 213, a regulating support screw 214, a regulating support screw rod, 215-fixed clamp seat, 216-through threaded hole, 217-pretightening screw, 22-positioning fixed seat, 221-fixed block II, 222-fixed groove, 223-mounting hole, 224-bolt, 23-telescopic positioning device, 231-positioning shaft shoulder, 232-positioning shaft rod, 233-flange plate, 234-displacement hole, 235-limiting groove, 236-limiting boss, 237-compression spring, 238-bearing, 24-rotating head and 3-workpiece.

Detailed Description

In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.

Example 1

As shown in figure 1, the tool assembly for processing the inner groove of the anti-deviation type hole comprises a tool 1 and a positioning mechanism 2,

as shown in fig. 2-3, the cutting tool 1 includes a tool shank 11, a frustum 12 is disposed at the front end of the tool shank 11, a positioning hole 13 is disposed on the front end surface of the frustum 12, an eccentric arc groove 14 is disposed at a position, close to the frustum 12, of the front portion of the tool shank 11, a top portion and a straight side of the eccentric arc groove 14 are communicated with the outside, a limiting clamping groove 16 for fixing the blade 15 is disposed in the eccentric arc groove 14, as shown in fig. 5, the blade 15 is of a diamond structure, acute angles at two ends of the blade 15 are tool tips, a through hole 151 is disposed at a center portion of the blade 15, and a screw 180 penetrates through the. The blade 15 with the diamond structure has two sharp-angled tool points, and can be used alternately, so that the service life of the blade 15 is prolonged. The blade 15 is clamped in the limiting clamping groove 16 and is in threaded connection with a threaded hole 18 in the limiting clamping groove 16 through a screw 180, the blade 15 can be fixed on the tool shank 11, one tool nose of the blade 15 extends to the outside of the limiting clamping groove 16 and forms a certain included angle with the side wall of the tool shank 11, and the tool shank is fixed on a fixing mechanism of a lathe tailstock through a clamping sleeve 17 at the tail part of the tool shank 11; as shown in fig. 4, the limiting clamping groove 16 includes a first straight line segment 161 forming a certain included angle with one side of the straight edge of the eccentric arc groove 14, the included angle is generally equal to the acute angle of the blade, the first straight line segment 161 is used for abutting against one side of the blade 15, the limiting clamping groove further includes a first arc segment 162 and a second arc segment 163 connected to the first straight line segment 161 and at the lower end, the first arc segment 162 is used for accommodating an inward acute-angle tool nose of the blade 15, the second arc segment 163 is used for accommodating an obtuse-angle part of the blade 15, the blade 15 can be conveniently detached and installed through a gap formed by the two arc segments and the blade 15, and meanwhile, the limiting clamping groove is stronger in adaptability and can clamp blades 15 with various different reaming sizes. A second straight line segment 164 perpendicular to the straight side of the eccentric arc groove 14 and connected to the first arc segment 162, and a third straight line segment 165 perpendicular to the straight side of the eccentric arc groove 14 and connected to the second arc segment 163, for defining the position of the blade 15 and preventing deviation thereof due to rotation. An opening structure communicated with the outside is formed between the second straight line section 164 and the third straight line section 165, so that a tool tip can extend out conveniently, and compared with a limiting groove completely matched with a blade structure, the multi-line-section irregular line is more convenient and practical by adopting the multi-line-section irregular line.

As shown in fig. 1, the positioning mechanism 2 includes a workpiece fixing seat 21 and a positioning fixing seat 22 which are installed on a lathe, a workpiece 3 is clamped on the workpiece fixing seat 21, the center of a hole to be processed of the workpiece 3 is opposite to the axis of the tool holder 11, the workpiece fixing seat 21 includes a first fixing block 211 which is installed on the lathe, a U-shaped groove 212 is formed on the first fixing block 211 to divide the fixing block into an upper part and a lower part, a blind hole thread groove 213 with an upward opening is formed in the lower part first fixing block 211a, an adjusting support screw 214 is arranged in the blind hole thread groove 213, the adjusting support screw 214 can be adjusted up and down to ensure that the center of the hole to be processed of the workpiece 3, a rotating head 24 at the front end of the telescopic positioning device 23 and a frustum 12 are located on the same horizontal line, a fixing clamp seat 215 is arranged at the top of the adjusting support screw 214, the workpiece 3 is placed on the fixing, the workpiece 3 is used for fixing and preventing the workpiece from loosening during machining, so that the machined hole is deviated.

As shown in fig. 1, the positioning fixing base 22 includes a second fixing block 221 installed on the lathe and located at the rear side of the first fixing block 211, a fixing groove 222 for fixing the telescopic positioning device 23 is opened at the front side of the second fixing block 221, and a plurality of mounting holes 223 are formed around the fixing groove 222. A telescopic positioning device 23 is clamped on the positioning fixing seat 22, a rotating head 24 is arranged at the front end of the telescopic positioning device 23, and the rotating head 24 is butted with the positioning hole 13 at the front end of the frustum 12 in the hole to be processed. As shown in fig. 1, the telescopic positioning device 23 includes a positioning shoulder 231 whose tail is fixed in the fixing groove 222 and a positioning shaft rod 232 located at the front end of the positioning shoulder 231, the positioning shoulder 231 is provided with a flange 233 for fixedly connecting with the mounting hole 223 through a bolt 224, the positioning shoulder 231 is provided with a displacement hole 234 inside, the side surface of the displacement hole 234 is provided with a limit groove 235, the rear end of the positioning shaft rod 232 is located in the displacement hole 234 and can be pulled in the radial direction, the tail of the positioning shaft rod 232 is provided with a limit boss 236 adapted to the limit groove 235, the tail of the positioning shaft rod 232 is connected with the inner bottom of the displacement hole 234 through a compression spring 237, and the head of the positioning shaft rod 232 is connected with the rotating head 24 having a tip through a bearing 238. As shown in fig. 1, an elastic lining layer 171 is provided inside the clamping sleeve 17, and the elastic lining layer 171 is fixedly connected to the clamping sleeve 171 by a rivet 172. The elastic lining layer 171 can be made of rubber, and can be connected to the inner wall of the clamping sleeve 17 in a gluing mode and fixed, and the rivet 172 is adopted to be nailed from the outside of the clamping sleeve 17 to the elastic lining layer 171 without penetrating for further fixation. The elastic lining layer 171 made of rubber can increase the friction force between the blade and the handle 11, prevent slipping, and simultaneously can offset the shaking caused by rotation.

The working method of the embodiment comprises the following steps: firstly, mounting a first fixing block 211 and a second fixing block 221 on a lathe, placing a positioning shaft shoulder 231 into a fixing groove 222 of the second fixing block 221, and fixedly connecting a flange 233 on the positioning shaft shoulder 231 with a mounting hole 223 of the second fixing block 221 by using a bolt 224, so that the tip of a positioning shaft rod 232 faces towards the first fixing block 211; secondly, placing the workpiece 3 on a fixed clamping seat 215, adjusting the height of the workpiece 3 by adjusting a supporting screw 214, enabling the circle center of a hole to be processed of the workpiece 3 to be opposite to the axis of a positioning shaft rod 232, and pre-tightening the workpiece 3 by screwing down a pre-tightening screw 217; thirdly, the blade 15 is placed in the limit clamping groove 16, after the position and the angle are adjusted, the screw 180 penetrates through the through hole 151 on the blade 15 and is fixedly connected with the threaded hole 18 in the limit clamping groove 16, then, the clamping sleeve 17 is sleeved at the tail part of the tool shank 11 in a rotating mode, the tool shank 11 is fixed on a three-jaw chuck of a lathe tailstock, the position of the tool 1 away from the workpiece 3 is adjusted, the tip part of a rotating head 24 at the front end of a positioning shaft rod 232 is abutted against a positioning hole 13 at the front end of a frustum 12 in a hole to be machined in the workpiece 3, the tool machine feeds the tool shank 11 forwards until the tool tip of a blade 15 is aligned with the workpiece 3, the three-jaw chuck of the tool machine is opened to drive the tool shank 11 to rotate, the workpiece 3 is reamed, the frustum 12 at the front end of the tool holder 11 and the rotating head 24 at the front end of the positioning shaft rod 232 form a support, and errors caused by the swing of the tool holder 11 can be effectively prevented in the rotating process. With the forward feeding of the tool holder 11, the positioning shaft rod 232 is extruded and gradually retreats along the displacement hole 234 under the buffering of the compression spring 237, so that the smooth proceeding of the machining process is ensured, the reaming quality is also ensured, and the cut-off scraps are discharged from the eccentric arc groove 14.

Example 2

As a further improvement, as shown in fig. 6, in the present embodiment, a connection hole 112 for connecting a blind rivet 111 is provided at the tail of the tool shank 11, and the blind rivet 111 penetrates the bottom of the clamping sleeve 17 and is fixed by a nut 113 located at the outside. Further fixing of the tool shank 11 to the clamping sleeve 17 can be carried out.

Claims

1. A tool assembly for processing an inner groove of an anti-deviation type hole is characterized by comprising a tool (1) and a positioning mechanism (2);

the cutter (1) comprises a cutter handle (11), a frustum (12) is arranged at the front end of the cutter handle (11), a positioning hole (13) is arranged on the front end surface of the frustum (12), an eccentric arc groove (14) is arranged on the front part of the knife handle (11) close to the frustum (12), the top and the straight side of the eccentric arc groove (14) are communicated with the outside, a limiting clamping groove (16) for fixing the blade (15) is arranged in the eccentric arc groove (14), the blade (15) is clamped in the limiting clamping groove (16), and is in threaded connection with a threaded hole (18) in the limiting clamping groove (16) through a screw (180), the lathe tailstock cutting tool is used for fixing a blade (15) on a lathe tool handle (11), one tool nose of the blade (15) extends to the outside of a limiting clamping groove (16) and forms a certain included angle with the side wall of the lathe tool handle (11), and the tail of the lathe tool handle (11) fixes the lathe tool handle (11) on a fixing mechanism of the lathe tailstock through a clamping sleeve (17);

the inner part of the clamping sleeve (17) is provided with an elastic inner lining layer (171), the elastic inner lining layer (171) is fixedly connected with the clamping sleeve (171) through a rivet (172), the elastic inner lining layer (171) can be made of rubber, and can be connected to the inner wall of the clamping sleeve (17) in a gluing mode and fixed, and then the rivet (172) is adopted to be nailed into the elastic inner lining layer (171) from the outer part of the clamping sleeve (17);

the positioning mechanism (2) comprises a workpiece fixing seat (21) and a positioning fixing seat (22) which are installed on a lathe, the workpiece fixing seat (21) is clamped with a workpiece (3), the center of a hole to be machined of the workpiece (3) is opposite to the axis of the cutter handle (11), the positioning fixing seat (22) is clamped with a telescopic positioning device (23), the front end of the telescopic positioning device (23) is provided with a rotating head (24), and the rotating head (24) is butted with a positioning hole (13) in the front end of the frustum (12) in the hole to be machined;

the limiting clamping groove (16) comprises a first straight line section (161) forming a certain included angle with one side of a straight edge of the eccentric arc groove (14), a first arc section (162) and a second arc section (163) connected to the upper end and the lower end of the first straight line section (161), a second straight line section (164) perpendicular to one side of the straight edge of the eccentric arc groove (14) and connected to the first arc section (162), and a third straight line section (165) perpendicular to one side of the straight edge of the eccentric arc groove (14) and connected to the second arc section (163), wherein an opening structure communicated with the outside is formed between the second straight line section (164) and the third straight line section (165);

the blade (15) is of a diamond structure, acute angle parts at two ends of the blade (15) are tool tips, a through hole (151) is formed in the center part of the blade (15), and the screw (180) penetrates through the through hole (151) and extends into the threaded hole (18);

the workpiece fixing seat (21) comprises a first fixing block (211) installed on a lathe, the first fixing block (211) is provided with a U-shaped groove (212) which divides the fixing block into an upper part and a lower part, a blind hole thread groove (213) with an upward opening is formed in the lower part of the first fixing block (211 a), an adjusting support screw (214) is arranged in the blind hole thread groove (213), a fixing clamp seat (215) is arranged at the top of the adjusting support screw (214), a workpiece (3) is placed on the fixing clamp seat (215), a penetrating threaded hole (216) is longitudinally formed in the upper part of the first fixing block (211 b), and a pre-tightening screw (217) used for adjusting the fixing workpiece (3) is arranged in the penetrating threaded hole (216).

2. The tool assembly for machining the inner groove of the deviation-preventing type hole as claimed in claim 1, wherein the positioning fixing seat (22) comprises a second fixing block (221) which is installed on a lathe and located at the rear side of the first fixing block (211), a fixing groove (222) for fixing the telescopic positioning device (23) is formed in the front side of the second fixing block (221), and a plurality of mounting holes (223) are formed in the periphery of the fixing groove (222).

3. The tool assembly for processing the inner groove of the anti-deviation type hole according to claim 2, wherein the telescopic positioning device (23) comprises a positioning shaft shoulder (231) the tail part of which is fixed in the fixing groove (222) and a positioning shaft rod (232) which is positioned at the front end of the positioning shaft shoulder (231), a flange (233) which is fixedly connected with the mounting hole (223) through a bolt (224) is arranged on the positioning shaft shoulder (231), a displacement hole (234) is arranged inside the positioning shaft shoulder (231), a limit groove (235) is arranged on the side surface of the displacement hole (234), the rear section of the positioning shaft rod (232) is positioned in the displacement hole (234) and can be radially drawn, a limit boss (236) which is matched with the limit groove (235) is arranged at the tail part of the positioning shaft rod (232), and the tail part of the positioning shaft rod (232) is connected with the inner bottom part of the displacement hole (234) through a compression spring (237), the head of the positioning shaft (232) is connected to the rotary head (24) with the tip by a bearing (238).

4. The tool assembly for machining the inner groove of the anti-deviation type hole is characterized in that the tail portion of the tool shank (11) is used for being connected with a connecting hole (112) of a pull nail (111), and the pull nail (111) penetrates through the bottom of the clamping sleeve (17) and is fixed through an external nut (113).