CN114632962B - Machining combined cutter applied to aviation parts and machining method - Google Patents

Abstract

The invention discloses a processing combined cutter applied to aviation parts, which comprises a connecting seat used for fixedly connecting with an external electric tool, wherein a bracket is integrally arranged at the lower end of the connecting seat, an adjusting opening and an opening are formed in the outer side of the bracket, and a clamping groove is formed in the inner wall of the bracket; further comprises: the rotating seat is movably connected to the inner side of the bracket; the fixed seat is welded and fixed on the outer side of the knife handle, and a movable column is movably arranged in a cavity of the fixed seat; the wind guide hole is formed in the cutter handle and used for guiding wind power. The combined cutter and the processing method for the aviation parts can be used for rapidly and stably replacing the cutters without types to carry out various processing on the parts, and can drive air to flow by utilizing power in the rotating process, so that the high-efficiency cooling of the combined cutter and the processing method can be realized, and meanwhile, scraps generated in the processing process can be blown away in real time, so that the processing precision of the device is effectively improved.

Description

Machining combined cutter applied to aviation parts and machining method

Technical Field

The invention relates to the technical field of aviation part machining, in particular to a machining combined cutter and a machining method applied to aviation parts.

Background

With the continuous development of aviation industry, various trend of aviation parts is generated, the aviation parts are more and more precise and complex, and in order to improve aviation safety, each part needs to be precisely machined, so that a combined cutter is required to be used for matching machining, but the existing machining combined cutter applied to aviation parts still has some defects.

The utility model discloses a draw hole cutter for processing aviation part major diameter pilot hole, it is after accomplishing drawing hole operation, when extruding the waste material, the uneven state of unilateral atress can appear in the waste material, be convenient for pop out the chamber that gathers materials with the waste material, avoid appearing card material phenomenon, when carrying out cutting operation simultaneously, can not appear not hard up under the effect of the moment of unscrewing between elasticity ejecting subassembly and the cutter body, avoid elasticity ejecting subassembly to become invalid because lax, and then avoid the emergence of card material condition, but it needs to extrude the waste material through the extrusion in the use, thereby make the cutting edge wearing and tearing too fast, although realize the quick discharge of waste material, but can't guarantee the cutting edge, its knife type is fixed simultaneously, inconvenient quick stable switch is carried out to the knife type according to the processing needs, result in the workable scope of cutter little, there is certain use defect.

Therefore, we propose a combined tool and a machining method applied to aviation parts, so as to solve the above-mentioned problems.

Disclosure of Invention

The invention aims to provide a processing combined tool and a processing method applied to an aviation part, which are used for solving the problems that the processing combined tool applied to the aviation part in the current market, which is proposed by the background technology, needs to extrude waste materials through extrusion, so that the abrasion of a cutting edge is too fast, the rapid discharge of the waste materials is realized, but the cutting edge cannot be ensured, meanwhile, the cutter type is fixed, the cutter type is not convenient to rapidly and stably switch according to the processing requirement, and the processing range of the cutter is small.

In order to achieve the above purpose, the present invention provides the following technical solutions: the combined cutter for machining aviation parts comprises a connecting seat which is used for being fixedly connected with an external electric tool, wherein a bracket is integrally arranged at the lower end of the connecting seat, an adjusting opening and an opening are formed in the outer side of the bracket, and a clamping groove is formed in the inner wall of the bracket;

further comprises:

the rotary seat is movably connected to the inner side of the bracket, two knife handles are integrally arranged at the upper end and the lower end of the rotary seat, knife holders are fixedly arranged at the end parts of the knife handles, a first blade and a second blade are respectively integrally arranged at the outer sides of the two knife holders, and meanwhile, the knife holders are fixedly arranged with the knife handles through fixing screws;

the magnetic block is fixedly embedded and installed on the inner wall of the top of the bracket;

the positioning ring is integrally arranged on the inner wall of the tool apron;

the fixed seat is welded and fixed on the outer side of the knife handle, and a movable column is movably arranged in a cavity of the fixed seat;

the wind guide hole is formed in the cutter handle and used for guiding wind power.

Preferably, the knife handle and the knife holder form a sleeving structure, guide blocks are arranged at the circumferential equal angles of the tail end of the knife handle, guide grooves are formed in the circumferential equal angles of the inner wall of the knife holder, and meanwhile, the guide blocks are in clearance fit with the guide grooves.

Through adopting above-mentioned technical scheme, can be convenient cup joint blade holder and handle of a knife, and the clearance fit of guide block and guide slot can effectively improve the connection stability between the two, avoids taking place relative rotation and influencing machining precision in the course of working.

Preferably, the positioning ring and the tool apron are of an integrated structure, the inner diameter of the positioning ring is smaller than the outer diameter of the end part of the fixing screw, and the fixing screw is in threaded connection with the tool handle.

Through adopting above-mentioned technical scheme, can make the fixed screw when with handle of a knife threaded connection, can extrude locking holding ring to realize the fixed to the blade holder, the installation, be convenient for follow-up dismantlement change to the blade holder.

Preferably, the central axes of the magnetic block and the knife handle are mutually overlapped, the positions of the magnetic block and the fixing screw are vertically corresponding, and the fixing screw is made of steel.

Through adopting above-mentioned technical scheme for when the handle of a knife rotates to being parallel to each other with the support, the position of magnetic path and fixed screw corresponds from top to bottom, thereby makes the fixed screw receive magnetic force effect to carry out preliminary location to the handle of a knife, avoids the handle of a knife to take place to warp and influence subsequent use after the regulation is accomplished.

Preferably, the fixing seat is provided with a plurality of fixed seat angles about the central axis of the knife handle, the inner side of the fixing seat is provided with a movable column in a telescopic manner, and a spring is connected between the end face of the movable column and the inner wall of the fixing seat.

Through adopting above-mentioned technical scheme for in the rotatory in-process of handle of a knife, the movable column can carry out elastic expansion along the inboard of fixing base under centrifugal force effect, and then realizes the automatically regulated to the fixing base position.

Preferably, the outside threaded connection of movable column has the counter weight screw, just the counter weight screw constitutes the block structure with the draw-in groove, simultaneously the draw-in groove symmetry is seted up in the inner wall of support.

Through adopting above-mentioned technical scheme for when the handle of a knife is rotatory, can drive the movable column and carry out elasticity and stretch out and draw back, make movable column end connection's counter weight screw can block into the draw-in groove then, thereby realize the location to the handle of a knife, avoid handle of a knife rotatory in-process to take place to rock, simultaneously through the precession degree of depth of change counter weight screw in movable column inside, can change the centrifugal force of counter weight screw, thereby realize the regulation to the eccentricity of handle of a knife, further improve the rotation stability of handle of a knife, thereby improve cutter machining precision.

Preferably, an air inlet hole is formed in the outer wall of one side of the fixing seat, and the cavity inside the fixing seat is communicated with the air guide hole.

Through adopting above-mentioned technical scheme for in the rotatory in-process of handle of a knife, the air can be through the fresh air inlet hole filling fixing base inboard, and then get into in the wind-guiding hole, thereby realize the high-efficient cooling to handle of a knife and blade holder, avoid operating temperature too high.

Preferably, the outer wall of the tool apron is provided with exhaust holes at equal angles with respect to the circumferential direction of the central axis, the exhaust holes are communicated with the air guide holes, the exhaust holes are provided in an inclined structure, and the exhaust holes, the first blades and the second blades are alternately distributed.

Through adopting above-mentioned technical scheme for the air that gets into in the wind-guiding hole can upwards be high-speed blowout through the exhaust hole, thereby blows off sweeps and granule that produce in the course of working fast, thereby avoids receiving the cutter extrusion and wearing and tearing part, and then has further improved the machining precision of combination cutter.

The invention provides another technical scheme that a processing method of a processing combined cutter applied to aviation parts comprises the following steps:

step one: the upper end of the connecting seat is fixedly connected with the output end of the electric tool for machining, then the rotating seat is rotated according to a machining mode required to be carried out, so that the rotating seat drives the tool handles to rotate 180 degrees, positions of the two tool handles are interchanged, the required tool holders face downwards, meanwhile, the magnetic blocks adsorb the fixing screws positioned below the tool holders through magnetic force, the preliminary positioning of the tool handles is realized, the tool handles can be enabled to keep the central axis coincident with the connecting seat, the counterweight screws are rotated subsequently, the screwing depth of the counterweight screws on the inner sides of the movable columns is adjusted, the centrifugal force of the counterweight screws is adjusted in the subsequent rotation process, and the correction of the eccentricity of the tool handles is realized;

step two: remove electric tool for the blade holder is located the outside that needs processing to be low, then starts electric tool, makes electric tool drive connecting seat and handle of a knife carry out synchronous revolution, and the inboard movable column of fixing base can carry out elasticity under centrifugal force effect this moment, thereby make movable column end connection's counter weight screw automatic card go into the draw-in groove of relevant position, thereby realize the location to the handle of a knife, ensure that the support coincides each other with the axis of handle of a knife between them, and then ensure the machining precision of blade holder, can be to inside groove step, downthehole side chamfer, draw the step countersink through using the first blade in the different blade holder outsides, the second blade.

Step three: in the working process of the cutter, the air inlet hole at the outer side of the fixing seat can be filled with a large amount of air, and the air can flow into the air guide hole through the inner cavity of the fixing seat, so that heat generated in the machining process of the cutter handle and the cutter seat can be rapidly removed, the air can be led to the exhaust hole through the air guide hole, the exhaust hole can spray the air obliquely upwards at a high speed, and therefore scraps generated at the machining position can be effectively blown away, and the cutter is prevented from extruding the scraps to influence the machining precision;

step four: after the processing is finished, the abrasion state of the cutter is observed, if the cutter is abraded greatly, the fixing screw is disassembled through rotation, and the cutter holder can be slid and disassembled from the lower end of the cutter handle, so that the first and second worn blades are convenient to replace, and the whole cutter is not required to be replaced.

Compared with the prior art, the invention has the beneficial effects that: the combined cutter and the processing method for the aviation parts can be used for rapidly and stably replacing the unnecessary types of cutters to carry out various processing on the parts, and can drive air to flow by utilizing power in the rotating process, so that the high-efficiency cooling of the combined cutter and the processing method can be realized, and meanwhile, scraps generated in the processing process can be blown away in real time, the processing precision of the device is effectively improved, and the concrete contents are as follows;

1. the rotary seat is provided with the support, the rotary seat and the movable column, the positions of the two groups of cutter handles can be exchanged through rotating the rotary seat, so that the quick switching of the cutter heads is realized, meanwhile, in the rotary process of the cutter handles, the movable column can be elastically telescopic and adjustable under the action of centrifugal force, and further, the counterweight screws on the outer sides of the movable column can be automatically clamped into clamping grooves at corresponding positions, so that the stability of the work of the cutter handles is ensured, the cutter handles are prevented from rotating sideways, and the machining precision is ensured while the cutter changing is conveniently and rapidly completed;

2. the balance weight screw is arranged, the screw-in depth of the balance weight screw in the movable column can be adjusted by rotating the balance weight screw, and the distance between the balance weight screw and the cutter handle is further changed, so that the centrifugal force generated by the balance weight screw in the rotation process of the cutter handle is changed, the eccentricity of the cutter handle is adjusted, and the machining precision of the cutter is further improved;

3. be provided with fresh air inlet, wind-guiding hole and exhaust hole, the fresh air inlet of fixing base lateral wall can automatic pour into a large amount of air when the handle of a knife carries out high-speed rotation for in the air current gets into the wind-guiding hole, thereby realize taking away fast the heat that produces when handle of a knife and blade holder work, the air current can be through the high-speed blowout of exhaust hole slope in the top simultaneously, thereby can blow away the sweeps that produce in the course of working, avoid the sweeps to remain and receive the extrusion of cutter and damage the part.

Drawings

FIG. 1 is a schematic view of a part of a main sectional structure of the present invention;

FIG. 2 is a schematic perspective view of a bracket according to the present invention;

FIG. 3 is a schematic view of a first blade mounting arrangement of the present invention;

FIG. 4 is a schematic top view of a first insert according to the present invention;

FIG. 5 is a schematic view of a bottom view of a first blade according to the present invention;

FIG. 6 is a schematic view of a second blade mounting structure of the present invention;

FIG. 7 is an enlarged schematic view of the structure of FIG. 1A according to the present invention;

fig. 8 is a schematic view of the mounting structure of the fixing base of the present invention.

In the figure: 1. a connecting seat; 2. a bracket; 3. an adjustment port; 4. an opening; 5. a rotating seat; 6. a knife handle; 7. a magnetic block; 8. a guide block; 9. a tool apron; 10. a guide groove; 11. a first blade; 12. a second blade; 13. a positioning ring; 14. a set screw; 15. a fixing seat; 16. a movable column; 17. a spring; 18. a counterweight screw; 19. a clamping groove; 20. an air inlet hole; 21. an air guide hole; 22. and an exhaust hole.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1-8, the present invention provides a technical solution: the combined cutter for machining aviation parts comprises a connecting seat 1 for fixedly connecting with an external electric tool, wherein a bracket 2 is integrally arranged at the lower end of the connecting seat 1, an adjusting port 3 and an opening 4 are formed in the outer side of the bracket 2, and a clamping groove 19 is formed in the inner wall of the bracket 2;

further comprises: the rotary seat 5 is movably connected to the inner side of the bracket 2, two knife handles 6 are integrally arranged at the upper end and the lower end of the rotary seat 5, knife holders 9 are fixedly arranged at the end parts of the knife handles 6, a first blade 11 and a second blade 12 are integrally arranged at the outer sides of the two knife holders 9 respectively, and meanwhile, the knife holders 9 are fixedly arranged with the knife handles 6 through fixing screws 14; the magnetic block 7 is fixedly embedded and arranged on the inner wall of the top of the bracket 2; the positioning ring 13 is integrally arranged on the inner wall of the tool apron 9; the fixed seat 15 is welded and fixed on the outer side of the knife handle 6, and a movable column 16 is movably arranged in the cavity of the fixed seat 15; the wind guide hole 21 is formed in the knife handle 6 and is used for guiding wind power.

The knife handle 6 and the knife holder 9 form a sleeving structure, the guide blocks 8 are arranged at the circumferential equal angles of the tail end of the knife handle 6, the guide grooves 10 are formed at the circumferential equal angles of the inner wall of the knife holder 9, and meanwhile, the guide blocks 8 are in clearance fit with the guide grooves 10. The positioning ring 13 and the tool holder 9 are of an integrated structure, the inner diameter of the positioning ring 13 is smaller than the outer diameter of the end part of the fixing screw 14, and the fixing screw 14 is in threaded connection with the tool handle 6. The central axes of the magnetic block 7 and the knife handle 6 are mutually overlapped, the positions of the magnetic block 7 and the fixing screw 14 are vertically corresponding, and the fixing screw 14 is made of steel.

The fixing base 15 is provided with a plurality of with respect to the central axis of the knife handle 6 in equal angle, the inner side of the fixing base 15 is provided with a movable column 16 in a telescopic manner, and a spring 17 is connected between the end face of the movable column 16 and the inner wall of the fixing base 15. The outside threaded connection of movable post 16 has counter weight screw 18, and counter weight screw 18 and draw-in groove 19 constitute the block structure, and draw-in groove 19 symmetry is seted up in the inner wall of support 2 simultaneously. An air inlet hole 20 is formed in the outer wall of one side of the fixing seat 15, and a cavity in the fixing seat 15 is communicated with the air guide hole 21.

The outer wall of the tool apron 9 is provided with exhaust holes 22 at equal angles around the central axis, the exhaust holes 22 are communicated with the air guide holes 21, the exhaust holes 22 are arranged in an inclined structure, and the exhaust holes 22, the first blades 11 and the second blades 12 are alternately distributed.

The machining method of the machining combined cutter applied to the aviation part comprises the following steps of:

step one: the upper end of the connecting seat 1 is fixedly connected with the output end of an electric tool for machining, then the rotating seat 5 is rotated according to a machining mode required to be carried out, so that the rotating seat 5 drives the tool handles 6 to rotate 180 degrees, positions of the two tool handles 6 are interchanged, the required tool holders 9 face downwards, meanwhile, the magnetic blocks 7 adsorb the fixed screws 14 positioned below the magnetic blocks through magnetic force, the preliminary positioning of the tool handles 6 is realized, the tool handles 6 can keep the central axis coincidence with the connecting seat 1, the counterweight screws 18 are rotated subsequently, the screwing depth of the counterweight screws 18 on the inner sides of the movable columns 16 is adjusted, and then the centrifugal force in the subsequent rotating process of the counterweight screws 18 is adjusted, so that the eccentricity of the tool handles 6 is corrected;

step two: remove electric tool for blade holder 9 is located the outside that needs processing to be low, then starts electric tool, make electric tool drive connecting seat 1 and handle of a knife 6 and carry out synchronous rotation, this moment under centrifugal force effect the inboard movable column 16 of fixing base 15 can carry out elasticity and stretch out and draw back, thereby make the automatic card of movable column 16 end connection's counter weight screw 18 go into the draw-in groove 19 of relevant position, thereby realize the location to handle of a knife 6, ensure that support 2 and the axis of handle of a knife 6 are mutual coincidence, and then ensure the machining precision of blade holder 9, through the first blade 11 of using different blade holder 9 outsides, second blade 12 can be to inside groove step, downthehole side chamfer, the step countersink of drawing.

Step three: during the working process of the cutter, the air inlet hole 20 at the outer side of the fixed seat 15 can be filled with a large amount of air, and at the moment, the air can flow into the air guide hole 21 through the inner cavity of the fixed seat 15, so that heat generated in the processing process of the cutter handle 6 and the cutter seat 9 can be rapidly removed, the air can be led into the air outlet hole 22 through the air guide hole 21, the air outlet hole 22 can spray the air obliquely upwards at a high speed, and therefore scraps generated at the processing position can be effectively blown away, and the phenomenon that the cutter extrudes the scraps to influence the processing precision is avoided;

step four: after the machining is finished, the abrasion state of the cutter is observed, if the cutter is abraded greatly, the fixing screw 14 can be rotationally detached, and the cutter holder 9 can be slid and detached from the lower end of the cutter handle 6, so that the worn first cutter blade 11 and second cutter blade 12 can be conveniently replaced later, and the whole cutter is not required to be replaced.

What has not been described in detail in this specification is prior art that is well known to those skilled in the art, and in the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.

Claims (2)

1. The utility model provides a be applied to processing combination cutter of aviation part, is including being used for carrying out fixed connection's connecting seat (1) with external electric tool, the lower extreme integration of connecting seat (1) is provided with support (2), just regulation mouth (3) and opening (4) have been seted up in the outside of support (2), and draw-in groove (19) have been seted up to the inner wall of support (2);

characterized by further comprising:

the rotary seat (5) is movably connected to the inner side of the bracket (2), two tool shanks (6) are integrally arranged at the upper end and the lower end of the rotary seat (5), tool holders (9) are fixedly arranged at the end parts of the tool shanks (6), a first blade (11) and a second blade (12) are respectively integrally arranged at the outer sides of the two tool holders (9), and the tool holders (9) are fixedly arranged with the tool shanks (6) through fixing screws (14);

the magnetic block (7) is fixedly embedded and installed on the inner wall of the top of the bracket (2);

the positioning ring (13) is integrally arranged on the inner wall of the tool apron (9);

the fixed seat (15) is welded and fixed on the outer side of the knife handle (6), and a movable column (16) is movably arranged in a cavity of the fixed seat (15);

the air guide hole (21) is formed in the knife handle (6) and is used for guiding wind power;

the tool holder (6) and the tool holder (9) form a sleeving structure, guide blocks (8) are arranged at the circumferential equal angles of the tail end of the tool holder (6), guide grooves (10) are formed in the circumferential equal angles of the inner wall of the tool holder (9), and meanwhile, the guide blocks (8) are in clearance fit with the guide grooves (10);

the positioning ring (13) and the tool apron (9) are of an integrated structure, the inner diameter of the positioning ring (13) is smaller than the outer diameter of the end part of the fixing screw (14), and the fixing screw (14) is in threaded connection with the tool handle (6);

the central axes of the magnetic block (7) and the knife handle (6) are mutually overlapped, the positions of the magnetic block (7) and the fixing screw (14) are vertically corresponding, and the fixing screw (14) is made of steel;

the fixed seat (15) is arranged in a plurality of equal angles relative to the central axis of the knife handle (6), the inner side of the fixed seat (15) is provided with a movable column (16) in a telescopic manner, and a spring (17) is connected between the end face of the movable column (16) and the inner wall of the fixed seat (15);

the outer side of the movable column (16) is in threaded connection with a counterweight screw (18), the counterweight screw (18) and the clamping groove (19) form a clamping structure, and meanwhile the clamping groove (19) is symmetrically arranged on the inner wall of the bracket (2);

an air inlet hole (20) is formed in the outer wall of one side of the fixed seat (15), and a cavity in the fixed seat (15) is communicated with the air guide hole (21);

the outer wall of the tool apron (9) is provided with exhaust holes (22) at equal angles around the central axis, the exhaust holes (22) are communicated with the air guide holes (21), the exhaust holes (22) are provided in an inclined structure, and the exhaust holes (22) are alternately distributed with the first blades (11) and the second blades (12).

2. A machining method of a machining composite tool for an aircraft part according to claim 1, comprising the steps of:

step one: the upper end of the connecting seat (1) is fixedly connected with the output end of the electric tool for machining, then the rotating seat (5) is rotated according to a machining mode required to be carried out, the rotating seat (5) drives the tool handles (6) to rotate 180 degrees, so that the positions of the two tool handles (6) are interchanged, the required tool holders (9) face downwards, meanwhile, the magnetic blocks (7) absorb the fixing screws (14) located below the magnetic blocks through magnetic force, the preliminary positioning of the tool handles (6) is realized, the tool handles (6) can be ensured to be coincident with the central axis of the connecting seat (1), the counterweight screws (18) are rotated subsequently, the screwing depth of the counterweight screws (18) at the inner sides of the movable columns (16) is adjusted, and the centrifugal force in the subsequent rotation process of the counterweight screws (18) is adjusted, so that the eccentricity of the tool handles (6) is corrected;

step two: the electric tool is moved, so that the tool holder (9) is positioned at the outer side of a workpiece to be machined, then the electric tool is started, the electric tool drives the connecting seat (1) and the tool holder (6) to synchronously rotate, at the moment, the movable column (16) at the inner side of the fixed seat (15) can elastically stretch under the action of centrifugal force, and accordingly a counterweight screw (18) connected with the end part of the movable column (16) is automatically clamped into a clamping groove (19) at a corresponding position, positioning of the tool holder (6) is achieved, the central axes of the support (2) and the tool holder (6) are ensured to be mutually overlapped, further the machining precision of the tool holder (9) is ensured, and an inner groove step, a hole inner side chamfer and a step are reamed by using a first cutter (11) and a second cutter (12) at the outer sides of different tool holders (9);

step three: in the working process of the cutter, the air inlet hole (20) at the outer side of the fixing seat (15) can be filled with a large amount of air, and the air can flow into the air guide hole (21) through the inner cavity of the fixing seat (15), so that heat generated in the machining process of the cutter handle (6) and the cutter seat (9) can be rapidly removed, the air can be led into the exhaust hole (22) through the air guide hole (21), the exhaust hole (22) can spray the air obliquely upwards at a high speed, and therefore scraps generated at a machining position can be effectively blown away, and the influence on machining precision caused by extrusion of the scraps by the cutter is avoided;

step four: after the machining is finished, the abrasion state of the cutter is observed, if the cutter is abraded greatly, the cutter holder (9) can slide and be detached from the lower end of the cutter handle (6) through rotating the detaching fixing screw (14), so that the worn first blade (11) and second blade (12) are convenient to replace subsequently, and the whole cutter is not required to be replaced.