CN113000876A - Machining cutter and machine tool with same - Google Patents

Abstract

The invention discloses a machining tool and a machine tool with the same, wherein the machining tool is used for machining a groove in the inner wall of a pipe fitting, the depth direction of the groove in the inner wall is parallel to the axial direction of the pipe fitting, the machining tool comprises a tool handle and a blade, a first end part of the tool handle is provided with a convex clamping part, the convex clamping part is provided with a notch, the convex clamping part is divided into a first clamping part and a second clamping part by the notch, and the tool handle further comprises a clamping bolt penetrating through the first clamping part, the notch and the second clamping part; the blade comprises a connecting part and a cutting part which are fixedly connected, the connecting part is used for being inserted into the opening, the extending length of the opening along the length direction of the handle is greater than that of the connecting part along the length direction of the handle, and the cutting part is used for cutting a groove on the inner wall of the pipe fitting. When the machining cutter is applied, the cutter blade can be quickly replaced when the cutter is broken, the working efficiency is effectively improved, and the production period is shortened.

Description

Machining cutter and machine tool with same

Technical Field

The invention relates to the technical field of machining, in particular to a machining tool and a machine tool with the same.

Background

The inner wall of the connecting pipe of the high-temperature gas cooled reactor nuclear island main equipment is provided with a groove extending along the circumferential direction of the pipe, the depth of the connecting pipe groove is about 40mm, the width of the connecting pipe groove is about 12mm, the position of the connecting pipe groove is about 300mm away from the end part of the connecting pipe, the conventional cutter is difficult to complete machining operation, the machining scrap condition cannot be observed in the machining process, the dependence on machining experience and turning method of an operator is high, cutter breakage is easy to occur, the efficiency is low, and the production period of a product is delayed.

Disclosure of Invention

In view of the above, a first object of the present invention is to provide a machining tool, in which when the machining tool is used, the cutting blade can be replaced quickly when the cutting tool is broken, so as to effectively improve the working efficiency and shorten the production cycle. A second object of the invention is to provide a machine tool comprising the machining tool described above.

In order to achieve the first object, the invention provides the following technical scheme:

a machining tool is used for machining a groove in the inner wall of a pipe fitting, the depth direction of the groove in the inner wall is parallel to the axial direction of the pipe fitting, the machining tool comprises a tool handle and a blade, a protruding clamping part is arranged at the first end of the tool handle, the protruding clamping part is provided with a notch, the protruding clamping part is divided into a first clamping part and a second clamping part through the notch, and the tool handle further comprises a clamping bolt penetrating through the first clamping part, the notch and the second clamping part;

the blade comprises a connecting part and a cutting part which are fixedly connected, the connecting part is used for being inserted into the opening, the extending length of the opening along the length direction of the handle is greater than that of the connecting part along the length direction of the handle, and the cutting part is used for cutting a groove on the inner wall of the pipe fitting.

Preferably, in the machining tool, the inner walls of the two sides of the notch are in transition connection through an arc-shaped wall; alternatively, the first and second electrodes may be,

the tail end of the opening is provided with a buffering round hole, and the inner walls of the two sides of the opening are in transitional connection through arc-shaped walls of the buffering round hole.

Preferably, in the machining tool, a positioning boss is arranged on an inner wall of the notch, and the positioning boss is used for abutting against the connecting part of the blade.

Preferably, in the machining tool, the convex clamping part is an arc-shaped plate, and the outer diameter of the arc-shaped plate is 4-5mm smaller than that of the pipe fitting.

Preferably, in the machining tool, the side surface of the tool shank body, which is opposite to the pipe fitting, is an arc surface; the side face, opposite to the pipe fitting, of the knife handle body is flush with the outer side cambered surface of the arc-shaped plate.

Preferably, in the machining tool, the cutting portion of the blade is circular truncated cone-shaped, the cutting edge of the cutting portion extends along the circumferential direction of the circular truncated cone-shaped, and an included angle between the first side surface and the second side surface of the cutting edge is 55 ° to 67 °.

Preferably, in the machining tool, the side wall of the cutting part is a first side surface of the blade, and an included angle between the first side surface of the blade and a center line of the cutting part is 8-10 °;

the top of the cutting part is provided with a conical or round table-shaped cutting edge avoiding groove, the side wall of the cutting edge avoiding groove is a second side surface of the cutting edge, and an included angle between the second side surface of the cutting edge and the top surface of the round table-shaped cutting part is 15-25 degrees.

Preferably, the machining cutter further comprises a lengthened cutter handle detachably connected with the cutter handle;

the lengthened knife handle is fixedly connected with the knife handle through a plurality of bolts.

Preferably, in the machining tool, a side surface of the lengthened tool shank, which is opposite to the pipe fitting, is an arc surface.

A machine tool comprising a machining tool as claimed in any one of the preceding claims.

The machining cutter provided by the invention comprises a cutter handle and a blade. The first end of handle of a knife has protruding clamping part, and this protruding clamping part is used for the centre gripping blade, and when processing pipe fitting inner wall recess, protruding clamping part can stretch into the inner wall recess and process.

The convex clamping part is provided with a gap which divides the convex clamping part into a first clamping part and a second clamping part. In other words, the notch divides the convex clamping part into two parts, one side of the notch is a first clamping part, and the other side of the notch is a second clamping part. The direction from the opening end of the notch to the bottom wall of the notch is along the direction from the first end part to the second end part of the knife handle. The handle of a knife still includes the clamping bolt who passes first clamping part, opening and second clamping part. After the blade is inserted into the notch, the first clamping part and the second clamping part can approach each other by screwing the nut of the clamping bolt, and the blade is finally clamped; the blade can be separated from the notch by loosening the nut of the clamping bolt.

The blade comprises a connecting part and a cutting part which are fixedly connected. The connecting portion and the cutting portion may be of an integral structure. The connecting part is inserted into the notch, and after the connecting part is inserted into the notch, the nut of the clamping bolt is screwed tightly, so that the first clamping part and the second clamping part clamp the blade. The cutting part is used for cutting a groove on the inner wall of the pipe fitting and is provided with a cutting edge used for cutting the groove on the inner wall of the pipe fitting.

The extension length of the gap along the length direction of the knife handle is greater than that of the connecting part along the length direction of the knife handle. Namely, after the connecting part of the knife handle is inserted into the notch, a gap is reserved between one end of the connecting part, which is far away from the cutting part, and the bottom wall of the notch. In other words, after the connecting part of the tool holder is inserted into the notch, the distance between one end of the connecting part, which is far away from the cutting part, and the bottom wall of the notch is greater than zero. So set up, first clamping part and second clamping part are bigger for the swing distance of handle of a knife body, and when first clamping part and second clamping part were close to relatively or kept away from, the clearance between first clamping part and the second clamping part was bigger, the operation of being convenient for more.

When the machining cutter provided by the embodiment is applied, when the cutter is broken, the nut of the clamping bolt can be unscrewed, the blade is separated from the notch, the new blade is replaced as soon as possible, and after the blade is replaced, the nut of the clamping bolt is screwed to generate enough pretightening force to clamp and fix the blade, so that the working efficiency can be effectively improved, and the production period can be shortened. In addition, the machining cutter has the advantages of simple structure and lower manufacturing cost.

In order to achieve the second object, the invention further provides a machine tool, which comprises any one of the machining tools. Because the machining tool has the technical effects, a machine tool with the machining tool also has corresponding technical effects.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a cross-sectional view of a tube;

FIG. 2 is a schematic structural diagram of a machining tool according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a machining tool for machining a groove in an inner wall according to an embodiment of the present invention;

FIG. 4 is a schematic view of a tool shank provided by an embodiment of the invention;

FIG. 5 is a top view of a blade provided by an embodiment of the present invention;

FIG. 6 is a side view of a blade provided by an embodiment of the present invention;

fig. 7 is a schematic structural diagram of the lengthened knife handle provided by the embodiment of the invention.

In the figure:

the device comprises a pipe fitting 1, a pipe fitting 1a, an inner wall groove 2, a cutter handle 2, a notch 2a, a buffering round hole 2a1, a positioning boss 2a2, a convex clamping part 2b, a clamping bolt hole 2c, a blade 3, a connecting part 3a, a cutting part 3b, a lengthened cutter handle 4, a holding groove 4a and a clamping bolt 5.

Detailed Description

The invention aims to provide a machining tool, which can be used for quickly replacing a blade when the tool is broken in the machining process, so that the working efficiency is effectively improved, and the production period is shortened. A second object of the invention is to provide a machine tool comprising the machining tool described above.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left" and "right", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the positions or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus are not to be construed as limitations of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Referring to fig. 1-3, the machining tool of the present invention is mainly used for machining a groove 1a on an inner wall of a pipe 1, and a depth direction of the groove 1a is parallel to an axial direction of the pipe 1. Specifically, the direction from the notch of the groove 1a in the inner wall of the pipe 1 to the groove bottom is parallel to the axis of the pipe 1.

The machining tool provided by the invention comprises a tool handle 2 and a blade 3. The first end of the tool holder 2 is provided with a convex clamping part 2b, the convex clamping part 2b is used for clamping the blade 3, and when the groove 1a in the inner wall of the pipe fitting 1 is machined, the convex clamping part 2b can extend into the groove 1a in the inner wall for machining.

The convex clamping portion 2b has a notch 2a, and the notch 2a divides the convex clamping portion 2b into a first clamping portion and a second clamping portion. In other words, the notch 2a divides the convex clamping portion 2b into two parts, one side of the notch 2a is a first clamping portion, and the other side of the notch 2a is a second clamping portion. The direction from the opening end of the notch 2a to the bottom wall of the notch 2a is along the direction from the first end part to the second end part of the knife handle 2. The tool shank 2 further comprises a clamping bolt 5 passing through the first clamping part, the notch 2a and the second clamping part. After the blade 3 is inserted into the notch 2a, the first clamping part and the second clamping part can be close to each other by screwing the nut of the clamping bolt 5, and the blade 3 is finally clamped; the insert 3 can be detached from the notch 2a by loosening the nut of the clamping bolt 5. The tool shank 2 is provided with a clamping bolt hole 2 c.

The insert 3 comprises a connecting portion 3a and a cutting portion 3b which are fixedly connected. The connecting portion 3a and the cutting portion 3b may be of an integral structure. The connecting portion 3a is inserted into the notch 2a, and after the connecting portion 3a is inserted into the notch 2a, the nut of the clamping bolt 5 is tightened so that the first clamping portion and the second clamping portion clamp the insert 3. The cutting part 3b is used for cutting a groove on the inner wall of the pipe 1, and the cutting part 3b has a blade for cutting an inner wall groove 1a on the inner wall of the pipe 1.

The extension length of the notch 2a in the longitudinal direction of the shank 2 is greater than the extension length of the connecting portion 3a in the longitudinal direction of the shank 2. That is, after the connecting portion 3a of the holder 2 is inserted into the notch 2a, a gap is formed between one end of the connecting portion 3a facing away from the cutting portion 3b and the bottom wall of the notch 2 a. In other words, after the connecting portion 3a of the holder 2 is inserted into the notch 2a, the distance from the end of the connecting portion 3a facing away from the cutting portion 3b to the bottom wall of the notch 2a is greater than zero. So set up, first clamping part and second clamping part are bigger for the swing distance of handle of a knife body, and when first clamping part and second clamping part were close to relatively or kept away from, the clearance between first clamping part and the second clamping part was bigger, the operation of being convenient for more.

When the machining cutter provided by the embodiment is applied, when the cutter is broken, the nut of the clamping bolt 5 can be unscrewed, the blade 3 is separated from the notch 2a, the new blade 3 is replaced as soon as possible, and after the blade 3 is replaced, the nut of the clamping bolt 5 is screwed to generate enough pretightening force to clamp and fix the blade 3, so that the working efficiency can be effectively improved, and the production period can be shortened. In addition, the machining cutter has the advantages of simple structure and lower manufacturing cost.

The pipe fitting 1 to be processed is made of an austenitic stainless steel overlaying layer, the matrix structure of the pipe fitting is austenite, the pipe fitting contains a large amount of Ni (8-25%) besides the Cr content (about 18%), and the pipe fitting is non-magnetic chromium-nickel steel. The austenitic stainless steel has a large cold hardening tendency and is characterized by good high-temperature corrosion resistance, high-temperature strength, plasticity and toughness. For the cutting characteristics of the austenitic stainless steel, the blade 3 is made of hard alloy, and the hard alloy can be YG, YW tungsten cobalt or M, K of ISO standard. The base material of the cutter body is made of M10 hard alloy, and the material has good cutting performance aiming at stainless steel materials.

Adopt M10 carbide blade 3 to carry out processing test, find that blade 3 can satisfy the processing demand, nevertheless wear and tear sooner, the reason is: the blade 3 is small in size, and heat generated during cutting is concentrated on the edge portion, resulting in burning of the edge. Through analysis and research, the anti-abrasion coating treatment is carried out on the blade 3, the coating material is high-temperature resistant TiAlN, and the coating material has good affinity with the stainless steel material of the groove area to be processed, so that the situations of chip accumulation, overheating of the blade 3 and the like generated in the machining process are avoided.

As shown in figure 4, the inner walls of the two sides of the gap 2a are connected by the transition of the arc-shaped wall. The recess of the curved wall faces the first end of the shank 2. The arc-shaped wall is positioned at the tail end of the notch 2a, and the tail end of the notch 2a is the end part of the notch 2a close to the second end part of the knife handle 2. So set up, when first clamping part and second clamping part swung for the handle of a knife body, the atress of first clamping part and second clamping part transmitted to the arc wall, and the cushioning effect of arc wall can prevent the terminal fracture of first clamping part and second clamping part.

Specifically, the end of the gap 2a may be a round buffering hole 2a 1. The axial line of the buffer round hole 2a1 is vertical to the length direction of the knife handle 2, or the axial line of the buffer round hole 2a1 is vertical to the depth direction of the gap 2a, and the inner walls of two sides of the gap 2a are in transition connection through the arc-shaped wall of the buffer round hole 2a 1.

Of course, the inner walls of the two sides of the gap 2a may be connected by a plane wall, which is not limited herein.

The width of the position of the gap 2a for inserting the blade 3 is 0.15-0.2mm larger than the thickness of the connecting part 3a of the blade 3, thereby ensuring that the blade 3 can be smoothly installed and has enough clamping force. The depth of the gap 2a is 2-3mm larger than the length of the connecting part 3a of the blade 3.

In order to position the blade 3 conveniently, a positioning boss 2a2 is arranged on the inner wall of the notch 2a, and the positioning boss 2a2 is used for abutting against the connecting part 3a of the blade 3. After the connecting part 3a of the blade 3 is inserted into the notch 2a, one end of the connecting part 3a, which is far away from the cutting part 3b, is abutted against the positioning boss 2a 2.

In order to prevent the raised clamping portion 2b from interfering with the groove wall of the inner wall groove 1a when the inner wall groove 1a of the pipe fitting 1 is machined, the raised clamping portion 2b may be an arc-shaped plate. The cell wall of inner wall recess 1a is the arcwall face, and protruding clamping part 2b also is the arc like this, and the axis of inner wall recess 1a is located the homonymy with the axis of protruding clamping part 2b, adds man-hour and can avoid protruding clamping part 2b and inner wall recess 1a collision to interfere.

The extension length of the convex clamping part 2b along the length direction of the tool holder 2 is 2-3mm larger than the depth of the groove 1a in the inner wall of the pipe fitting 1, so that the tool holder 2 is not interfered with a workpiece in the turning process of the groove 1a in the inner wall of the pipe fitting 1, the part of the convex clamping part 2b does not extend too long, the rigidity is insufficient, and the clamping force of the blade 3 is insufficient to cause the blade 3 to fall off in the turning process.

Preferably, the axis of the inner wall groove 1a and the axis of the convex grip portion 2b may coincide.

The outer diameter of the arc-shaped plate is 4-5mm smaller than that of the pipe fitting 1, so that the width of the raised clamping part 2b is not limited, and a safety gap between the arc-shaped plate and the groove wall of the inner wall groove 1a can be ensured. The thickness of the protruding clamping part 2b is 4-5mm less than the width of the groove 1a on the inner wall of the pipe fitting 1, and the width direction of the groove 1a on the inner wall is divided into 2-knife or 3-knife machining. By adjusting the positions of the convex clamping part 2b and the blade 3 on the machine tool, the processing of different positions of the inner wall groove 1a can be realized.

Of course, the outer diameter of the arc plate can be set according to the actual situation, and is not limited herein.

In another embodiment, the raised holding portion 2b may be a flat plate, and when the raised holding portion 2b is a flat plate, the width thereof is smaller to ensure a safety gap with the groove wall of the inner wall groove 1 a.

Similarly, in order to prevent the tool holder 2 from interfering with the inner wall of the pipe 1, the side surface of the tool holder body opposite to the pipe 1 is a cambered surface. The diameter of the side of the shank body for the opposite side to the tube 1 may be equal to or smaller than the diameter of the tube 1, preferably the diameter of the side of the shank body for the opposite side to the tube 1 is slightly smaller than the diameter of the tube 1.

Preferably, the side of the shank body for opposing the tube 1 is flush with the side of the convex clamping portion 2b for opposing the tube 1. The side that is used for with pipe fitting 1 of handle of a knife body is parallel and level with the outside cambered surface of arc, and the side that is used for with pipe fitting 1 of handle of a knife body promptly is same curved surface with the outside cambered surface of arc.

Of course, the side surface of the tool holder body opposite to the pipe fitting 1 and the outer arc surface of the arc plate may be staggered, and are not limited herein.

As shown in fig. 5 to 6, the cutting portion 3b of the insert 3 has a circular truncated cone shape, and the cutting edge of the cutting portion 3b extends in the circumferential direction of the circular truncated cone shape, specifically, the diameter of the first end of the cutting portion 3b is large, and the diameter of the second end of the cutting portion 3b is small. The cutting edge of the cutting portion 3b is located at a first end thereof, the cutting edge extending along the edge of the first end of the cutting portion 3 b. The arc-shaped cutting edge is adopted to obtain good cutting effect. The machining test shows that the cutting effect is good.

The two side walls of the blade are respectively a first side surface and a second side surface, and the included angle between the first side surface and the second side surface of the blade is 55-67 degrees. Of course, the included angle between the first side surface and the second side surface of the blade edge can also be other angle values, such as 50 ° according to the actual situation, and is not limited herein.

As shown in fig. 6, the side wall of the cutting part 3b is the first side surface of the blade, and the included angle between the first side surface of the blade and the center line of the cutting part 3b is α, which is 8 ° to 10 °. The included angle between the side wall of the truncated cone-shaped cutting part 3b and the central line of the truncated cone shape is alpha, and the alpha is 8-10 degrees.

The top of the cutting portion 3b has a conical or truncated cone-shaped blade escape groove. The side wall of the blade avoiding groove is a second side surface of the blade, and an included angle between the second side surface of the blade and the top surface of the truncated cone-shaped cutting part 3b is beta, wherein the beta is 15-25 degrees. The top surface of the circular truncated cone-shaped cutting portion 3b is perpendicular to the center line of the cutting portion 3b, and the top surface and the bottom surface of the circular truncated cone-shaped cutting portion 3b are parallel.

After the blade 3 and the tool holder 2 are assembled, the axis of the truncated cone-shaped cutting part 3b is perpendicular to the axis of the arc-shaped plate. The arcuate plate extends about an axis thereof. When the groove 1a on the inner wall of the pipe fitting 1 is machined, the included angle between the central line of the truncated cone-shaped cutting part 3b and the axis of the pipe fitting 1 is 45 degrees, so that the cutting edge is inclined relative to the pipe fitting 1.

Of course, the cutting portion 3b may have other shapes, such as a flat plate shape, and the blade is located at the edge of the flat plate shape, which is not limited herein.

In another specific embodiment, the machining tool further comprises a lengthened tool shank 4 detachably connected with the tool shank 2, and the lengthened tool shank is used for solving the problem that the distance between the position of the groove 1a in the inner wall of the pipe fitting 1 and the end part of the pipe fitting 1 is large. The lengthened cutter handle 4 can be clamped and fixed on a horizontal lathe cutter table so as to be suitable for processing the inner wall groove 1a with larger depth. After the lengthened cutter handle 4 is clamped and fixed on a horizontal lathe cutter platform, the pipe fitting 1 to be processed is clamped and fixed on a lathe and is aligned by a dial indicator, and the alignment precision is controlled within 0.1 mm.

The lengthened cutter handle 4 and the cutter handle 2 can be fixedly connected through a plurality of bolts. Be provided with the holding tank 4a that is used for placing handle of a knife 2 on the extension handle of a knife 4, arrange the handle of a knife body in holding tank 4a back, the bolt will extend handle of a knife 4 and handle of a knife 2 fixed can. The lengthened knife handle 4 and the knife handle 2 can be fixedly connected through 4-5 bolts, and the thread specification can be selected from M8-M12 mm.

The lengthened cutter handle 4 can be made of 20 steel or other steel materials with similar mechanical properties.

The tail end of the lengthened cutter handle 4 is matched with a horizontal lathe cutter table in size and used for clamping.

In order to prevent the lengthened cutter handle 4 from interfering with the inner wall of the pipe fitting 1, the side surface of the lengthened cutter handle 4 opposite to the pipe fitting 1 is a cambered surface. The diameter of the side of the elongated shank 4 opposite the tube 1 may be equal to or smaller than the diameter of the tube 1, preferably the diameter of the side of the elongated shank 4 opposite the tube 1 is slightly smaller than the diameter of the tube 1.

The length of the tool shank 2 can be designed according to the common standard tool shank, so that the tool shank can be conveniently installed and clamped on a tool post of a common horizontal lathe under the condition that the lengthened tool shank 4 is not used.

When the machining cutter provided by the invention is applied, the cutting speed can be 650-800 r/min, and the cutting temperature is not required to be too high, so that the cutting temperature is reduced. The feeding amount can be selected from 0.12-0.18 mm/r. The feed amount should not be too large to reduce the cutting load. The back cutting amount is as large as possible within the bearable range of the cutter, and 0.8-1.5 mm can be selected.

Based on the machining tool provided in the above embodiment, the invention further provides a machine tool, which includes any one of the machining tools in the above embodiments. Because the machine tool adopts the machining tool in the above embodiment, please refer to the above embodiment for the beneficial effects of the machine tool.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims (10)

1. A machining tool is used for machining a groove (1a) in the inner wall of a pipe fitting (1), and the depth direction of the groove (1a) in the inner wall is parallel to the axial direction of the pipe fitting (1), and is characterized by comprising a tool handle (2) and a blade (3), wherein a protruding clamping part (2b) is arranged at the first end part of the tool handle (2), the protruding clamping part (2b) is provided with a notch (2a), the notch (2a) divides the protruding clamping part (2b) into a first clamping part and a second clamping part, and the tool handle (2) further comprises a clamping bolt (5) penetrating through the first clamping part, the notch (2a) and the second clamping part;

the cutting tool is characterized in that the blade (3) comprises a connecting portion (3a) and a cutting portion (3b), the connecting portion (3a) is fixedly connected with the connecting portion, the connecting portion (3a) is used for being inserted into the notch (2a), the extending length of the notch (2a) in the length direction of the tool handle (2) is larger than the extending length of the connecting portion (3a) in the length direction of the tool handle (2), and the cutting portion (3b) is used for cutting a groove in the inner wall of the pipe fitting (1).

2. The machining tool according to claim 1, characterized in that the inner walls of the two sides of the gap (2a) are connected by an arc-shaped wall transition; alternatively, the first and second electrodes may be,

the tail end of the notch (2a) is provided with a buffering round hole (2a1), and the inner walls of the two sides of the notch (2a) are in transition connection through the arc-shaped wall of the buffering round hole (2a 1).

3. The machining tool according to claim 1, characterized in that a positioning boss (2a2) is provided on the inner wall of the gap (2a), the positioning boss (2a2) being used for abutting against the connecting portion (3a) of the blade (3).

4. The machine tool according to claim 1, characterized in that the raised clamping portion (2b) is an arcuate plate having an outer diameter 4-5mm smaller than the outer diameter of the tube (1).

5. The machining tool according to claim 4, characterized in that the side of the shank body opposite to the tube (1) is a cambered surface; the side face, opposite to the pipe fitting (1), of the knife handle body is flush with the outer side cambered surface of the arc-shaped plate.

6. The machining tool according to claim 1, characterized in that the cutting portion (3b) of the insert (3) is truncated cone-shaped, the cutting edge of the cutting portion (3b) extending in the circumferential direction of the truncated cone-shape, and the angle between the first side surface and the second side surface of the cutting edge being 55 ° to 67 °.

7. The machining tool according to claim 6, characterized in that the side wall of the cutting part (3b) is a first side of the cutting edge and the angle between the first side of the cutting edge and the centre line of the cutting part (3b) is 8 ° -10 °;

the top of the cutting part (3b) is provided with a conical or circular truncated cone-shaped cutting edge avoiding groove, the side wall of the cutting edge avoiding groove is a second side surface of the cutting edge, and an included angle between the second side surface of the cutting edge and the top surface of the circular truncated cone-shaped cutting part (3b) is 15-25 degrees.

8. The machining tool according to claim 1, further comprising an elongated shank (4) detachably connected to the shank (2);

the lengthened knife handle (4) is fixedly connected with the knife handle (2) through a plurality of bolts.

9. The machining tool according to claim 8, characterized in that the side of the lengthened shank (4) opposite to the pipe (1) is a cambered surface.

10. A machine tool comprising a machine tool according to any one of claims 1 to 9.

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