CN112453506B

CN112453506B - Drilling machining tool

Info

Publication number: CN112453506B
Application number: CN202011317042.XA
Authority: CN
Inventors: 江爱胜; 向良雄; 余仁超
Original assignee: Zhuzhou Cemented Carbide Cutting Tools Co Ltd
Current assignee: Zhuzhou Cemented Carbide Cutting Tools Co Ltd
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2022-05-24
Anticipated expiration: 2040-11-20
Also published as: CN112453506A

Abstract

The invention discloses a drilling processing cutter, two external cutting blades are respectively arranged at two sides of a central drill point to form a complete cutting unit with the central drill point, a first clamping concave groove and a second clamping concave groove which are mutually crossed are arranged on a cutting interface part, a first clamping boss and a second clamping boss which are mutually crossed are arranged on the clamping interface part, the first clamping concave groove penetrates through the peripheral surface of the cutting interface part, the second clamping concave groove penetrates through the bottom surface of a chip discharge groove of the cutting interface part, the outer side surface of the first clamping boss is smoothly connected with the peripheral surface of the clamping interface part, the outer side surface of the second clamping boss is smoothly connected with the bottom surface of the chip discharge groove of the clamping interface part, when a cutting part is arranged in place on the clamping part, the first clamping boss is arranged in the first clamping concave groove, the second clamping boss is arranged in the second clamping concave groove and is matched to realize the circumferential positioning of the cutting part and the clamping part, the drilling machining tool has the advantages of convenience in assembly and disassembly, high positioning strength and precision and the like.

Description

Drilling machining tool

Technical Field

The invention mainly relates to the field of metal cutting machining, in particular to a drilling machining tool.

Background

In drilling, in order to prolong the service life of the cutting part, expensive hard alloy or similar materials are generally adopted as tool materials, and the materials have the characteristics of high hardness and good wear resistance, but the processing is extremely difficult, so that the material cost and the processing cost of the drilling tool are high.

The conventional drilling tool is generally assembled by a center drill point and a clamping tool body, wherein the center drill point is made of hard alloy or similar materials with high hardness and wear resistance, the clamping tool body is made of materials with high elasticity, and only a new center drill point needs to be replaced after the center drill point is damaged, so that the use cost of the drilling tool is reduced. However, the center drill point is generally formed by a die pressing process, and complex large-size products manufactured by the process are easy to deform and crack during sintering, so the diameter of a drilling tool adopting the center drill point is generally below 30mm due to the restriction of the production process.

The use of a central drill point, two outer cutting inserts forming a cutting unit with a combined edge, allows to increase the diameter of the drilling tool considerably, but the cutting overhang length of the drilling tool is required to be more than 10 times of the cutting diameter, the manufacturing cost of the clamping part is high, the cutting precision is difficult to ensure, and the vulnerable area is generally concentrated on the cutter body part adjacent to the cutting area, therefore, a split structure is adopted, namely, the cutter body adjacent to the cutting area is designed into a cutting part, the cutter body far away from the cutting area is designed into a clamping part, the cutting part can be repeatedly arranged on the clamping part, when the cutting component is damaged, only the cutting component needs to be replaced, but the clamping component does not need to be replaced, thereby greatly reducing the manufacturing cost, however, the drilling tool with the split structure is adopted, so that the connection precision and the connection rigidity of the cutting part and the clamping part are difficult to guarantee, and the cutting performance of the tool is greatly influenced.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a drilling machining tool which is convenient to assemble and disassemble and high in positioning strength and precision.

In order to solve the technical problems, the invention adopts the following technical scheme:

a drilling machining tool comprises a cutting component, a clamping component, a central drill point and two outer cutting blades, wherein the cutting component is provided with a cutting interface part and a cutting part, the clamping component is provided with a clamping interface part and a clamping part, the cutting interface part can be repeatedly assembled and disassembled on the clamping interface part, the central drill point and the outer cutting blades are respectively arranged at the center and the circumferential position of the cutting part, the two outer cutting blades are respectively arranged at two sides of the central drill point to form a complete cutting unit with the central drill point, the cutting interface part is provided with a first clamping concave groove and a second clamping concave groove which are mutually crossed, the clamping interface part is provided with a first clamping boss and a second clamping boss which are mutually crossed, the first clamping concave groove penetrates through the circumferential surface of the cutting interface part, and the second clamping concave groove penetrates through the bottom surface of a chip discharge groove of the cutting interface part, the lateral surface of first centre gripping boss with the global smooth connection of centre gripping interface part, the lateral surface of second centre gripping boss with the bottom surface of the chip groove of centre gripping interface part is smooth to be connected, when cutting member installed in place on clamping member, first centre gripping boss was arranged in first centre gripping recess, second centre gripping boss was arranged in just the cooperation realization in the second centre gripping recess cutting member and clamping member's location.

As a further improvement of the above technical solution:

the first clamping recess comprises two first recess side surfaces and a first recess bottom surface, the second clamping recess comprises two second recess side surfaces and a second recess bottom surface, the first clamping boss comprises two first protrusion side surfaces and a first protrusion top surface, the second clamping boss comprises two second protrusion side surfaces and a second protrusion top surface, when the cutting member is mounted in place on the clamping member, the gap between the first recess bottom surface and the first protrusion top surface is d1, the gap between the second recess bottom surface and the second protrusion top surface is d 1', which should satisfy: d1 is not less than 0.05mm, d 1' is not less than 0.5 mm.

The first clamping recess and the second clamping recess are both arranged on the cutting end face of the cutting interface part, the first clamping boss and the second clamping boss are both arranged on the clamping end face of the clamping interface part, and when the cutting component is mounted in place on the clamping component, a gap d2 between the cutting end face and the clamping end face is equal to 0.

The included angle between the first concave side surface and the second concave side surface is alpha, and the following conditions are met: alpha is more than or equal to 80 degrees and less than or equal to 110 degrees.

During cutting machining, the region that first recess side lies in cutter center pin both sides is location portion and non-location portion respectively, and the clearance between location portion and the first protruding side that corresponds is d6, and the clearance between non-location portion and the first protruding side that corresponds is d5, two the location portion of first recess side lies in the both sides of cutter center pin respectively, should satisfy: d5 is not less than 0.05mm and not more than 0.5mm, and d6 is 0.

During cutting machining, the region that the second recess side is located cutter center pin both sides is location portion and non-location portion respectively, and the clearance between location portion and the protruding side of the second that corresponds is d3, and the clearance between non-location portion and the protruding side of the second that corresponds is d4, two the location portion of second recess side is located the both sides of cutter center pin respectively, should satisfy: d3 is more than or equal to 0 and less than or equal to 0.05, and d4 is more than or equal to 0.05mm and less than or equal to 0.5 mm.

The cutting tool comprises a first concave bottom surface, a first convex top surface and a cutting component, wherein a central groove is formed in the central area of the first concave bottom surface, a central column is arranged in the central area of the first convex top surface, and when the cutting component is installed on the clamping component in place, the central column is matched with the central groove for positioning.

The central groove comprises a groove bottom surface and a groove side surface, the central column comprises a column top surface and an outer cylindrical surface, the diameter of the cutting unit is D1, the diameter of the outer cylindrical surface is D2, and the following requirements are met: 0.05D1 is not less than D2 is not less than 0.2D 1.

When cutting member puts in place on the hold assembly, be equipped with the clearance between tank bottom surface and the post top surface, the diameter of groove side is D2', should satisfy: D2-D2' is less than or equal to 0.05mm and less than or equal to 0.05 mm.

The drilling tool further comprises two connecting pieces, one end of each connecting piece is in threaded connection with the threaded connecting holes, the other end of each connecting piece is mounted in the corresponding cooling hole through a fastener to achieve axial connection of the cutting part and the clamping part, and cooling guide holes of the cooling holes are formed in the connecting pieces.

The centre gripping groove of connecting piece includes two clamp groove sides and is located two clamp groove bottom surface between the clamp groove side, press from both sides the groove side about the clamp groove central symmetry in centre gripping groove, two contained angle between the clamp groove side is beta, should satisfy: beta is more than or equal to 60 degrees and less than or equal to 100 degrees.

The center of the clamping groove is deviated from the fastening center of the corresponding fastener to the cutting part by d, and the following conditions are met: d3 is more than or equal to 0 and less than or equal to 0.2 mm.

A drilling machining tool comprises a cutting component, a clamping component, a central drill point and two outer cutting blades, wherein the cutting component is provided with a cutting interface part and a cutting part, the clamping component is provided with a clamping interface part and a clamping part, the cutting interface part can be repeatedly assembled and disassembled on the clamping interface part, the central drill point and the outer cutting blades are respectively arranged at the center and the circumferential position of the cutting part, the two outer cutting blades are respectively arranged at two sides of the central drill point to form a complete cutting unit with the central drill point, the cutting interface part is provided with a first clamping boss and a second clamping boss which are mutually crossed, the clamping interface part is provided with a first clamping recess and a second clamping recess which are mutually crossed, the outer side surface of the first clamping boss is smoothly connected with the circumferential surface of the cutting interface part, the outer side surface of the second clamping boss is smoothly connected with the bottom surface of a chip discharge groove of the cutting interface part, the first clamping concave groove penetrates through the circumferential surface of the clamping interface part, the second clamping concave groove penetrates through the bottom surface of a chip discharge groove of the clamping interface part, when the cutting part is installed on the clamping part in place, the first clamping boss is arranged in the first clamping concave groove, the second clamping boss is arranged in the second clamping concave groove and is matched with the second clamping concave groove to achieve circumferential positioning of the cutting part and the clamping part.

Compared with the prior art, the invention has the advantages that:

the drilling processing cutter of the invention has the advantages that the first clamping boss is arranged in the first clamping recess, the second clamping boss is arranged in the second clamping recess to be matched with the first clamping recess to realize the circumferential positioning of the cutting part and the clamping part, the first clamping boss and the second clamping boss are mutually crossed, the first clamping recess and the second clamping recess are mutually crossed, the circumferential and radial double positioning can be realized, the circumferential rigidity of the transmission torque transmitted to the cutting part by the clamping part is greatly improved, the cutting vibration is effectively reduced, the maximum drilling depth of the drilling cutter is improved, the first clamping recess penetrates through the circumferential surface of the cutting interface part, the second clamping recess penetrates through the bottom surface of a chip removal groove of the cutting interface part, the positioning strength is furthest improved, the matching state between the clamping recess and the clamping boss can be directly detected and observed during the assembly, and the accurate positioning and installation of the cutting part on the clamping part are ensured, the assembly and disassembly are convenient.

Drawings

Fig. 1 is an exploded perspective view of the drilling tool of the present invention.

Fig. 2 is a front view of the drilling tool of the present invention.

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

Fig. 4 is a sectional view B-B of fig. 2.

Fig. 5 is a cross-sectional view C-C of fig. 2.

Fig. 6 is a cross-sectional view taken along line D-D of fig. 3.

FIG. 7 is an enlarged view of FIG. 6 at E

Fig. 8 is a perspective view of a cutting member of the drilling tool of the present invention.

The reference numerals in the figures denote:

1. a cutting member; 11. a cutting interface portion; 111. a first clamping recess; 1111. a first concave side; 1112. a first recessed bottom surface; 112. a second clamping recess; 1121. a second recessed side; 1122. a second recessed bottom surface; 114. a central recess; 1141. the bottom surface of the groove; 1142. a groove side surface; 115. connecting a threaded hole; 117. cutting an end face; 12. a cutting portion; 2. a clamping member; 21. a clamping interface portion; 211. a first clamping boss; 2111. a first convex side; 2112. a first raised top surface; 212. a second clamping boss; 2121. a second convex side; 2122. a second convex top surface; 200. a cutter central shaft; 214. a central column; 2141. a pillar top surface; 2142. an outer cylindrical surface; 215. a cooling hole; 216. clamping the end face; 22. a clamping portion; 3. a central drill point; 4. an outer cutting blade; 5. a connecting member; 51. cooling the guide hole; 52. a clamping groove; 521. the side surface of the clamping groove; 522. the bottom surface of the clamping groove; 523. the center of the clamping groove; 6. a fastener; 61. and (4) fastening the center.

Detailed Description

The invention will be described in further detail below with reference to the drawings and specific examples.

Fig. 1 to 8 show an embodiment of a drilling tool according to the present invention, which comprises a cutting member 1, a clamping member 2, a center drill tip 3 and two outer cutting inserts 4, wherein the cutting member 1 is provided with a cutting interface portion 11 and a cutting portion 12, the clamping member 2 is provided with a clamping interface portion 21 and a clamping portion 22, the cutting interface portion 11 is repeatedly attachable to and detachable from the clamping interface portion 21, the center drill tip 3 and the outer cutting inserts 4 are respectively mounted at the central and circumferential positions on the cutting portion 12, the two outer cutting inserts 4 are respectively arranged at two sides of the center drill tip 3 to form a complete cutting unit with the center drill tip 3, the cutting interface portion 11 is provided with a first clamping recess 111 and a second clamping recess 112 which are intersected with each other, the clamping interface portion 21 is provided with a first clamping boss 211 and a second clamping boss 212 which are intersected with each other, the first clamping recess 111 penetrates through the circumferential surface of the cutting interface portion 11, the second clamping recess 112 penetrates through the bottom surface of a chip groove of the cutting interface part 11, the outer side surface of the first clamping boss 211 is smoothly connected with the peripheral surface of the clamping interface part 21, the outer side surface of the second clamping boss 212 is smoothly connected with the bottom surface of the chip groove of the clamping interface part 21, when the cutting component 1 is installed on the clamping component 2 in place, the first clamping boss 211 is arranged in the first clamping recess 111, the second clamping boss 212 is arranged in the second clamping recess 112 and is matched with the second clamping recess to realize the positioning of the cutting component 1 and the clamping component 2, the first clamping boss 211 and the second clamping boss 212 are mutually crossed, the first clamping recess 111 and the second clamping recess 112 are mutually crossed, the first clamping boss 211 is arranged in the first clamping recess 111, the second clamping boss 212 is arranged in the second clamping recess 112 to be matched with the positioning of the cutting component 1 and the clamping component 2, and the circumferential and radial double positioning of the cutting component 1 and the clamping component 2 can be realized, the circumferential rigidity of the transmission torque transmitted to the cutting component 1 by the clamping component 2 is greatly improved, the cutting vibration is effectively reduced, the maximum drilling depth of a drilling tool is improved, the first clamping concave groove 111 penetrates through the circumferential surface of the cutting interface part 21, and the second clamping concave groove 112 penetrates through the bottom surface of a chip removal groove of the cutting interface part 21, so that the positioning strength is improved to the maximum extent, the matching state between the clamping concave groove and the clamping boss can be directly detected and observed during assembly, the accurate positioning and installation of the cutting component 1 on the clamping component 2 are ensured, and the assembly and disassembly are convenient.

In this embodiment, the first clamping recess 111 comprises two first recess side surfaces 1111 and one first recess bottom surface 1112, the second clamping recess 112 comprises two second recess side surfaces 1121 and one second recess bottom surface 1122, the first clamping boss 211 comprises two first protrusion side surfaces 2111 and one first protrusion top surface 2112, the second clamping boss 212 comprises two second protrusion side surfaces 2121 and one second protrusion top surface 2122, the gap between the first recess bottom surface 1112 and the first protrusion top surface 2112 is d1 and the gap between the second recess bottom surface 1122 and the second protrusion top surface 2122 is d 1' when the cutting member 1 is mounted in place on the clamping member 2, in order to ensure that the cutting member 1 has good axial deformation resistance on the clamping member 2, it is satisfied that: d1 is not less than 0.05mm, d1 'is not less than 0.5mm, in the embodiment, d1 is not less than d 1' is not less than 0.2 mm.

In this embodiment, the first clamping recess 111 and the second clamping recess 112 are both provided in the cutting end surface 117 of the cutting interface portion 11, and the first clamping projection 211 and the second clamping projection 212 are both provided in the clamping end surface 216 of the clamping interface portion 21, so that in order to ensure a good axial deformation resistance of the cutting member 1 in the clamping member 2, the clearance d2 between the cutting end surface 117 and the clamping end surface 216 is equal to 0 when the cutting member 1 is mounted in place on the clamping member 2.

In this embodiment, the included angle between the first concave side surface 1111 and the second concave side surface 1121 is α, and in order to ensure that the cutting element 1 can be positioned in any radial direction of the clamping element 2, it should be satisfied that: α is 80 ° to 110 °, in this example, α is 90 °.

In this embodiment, during cutting, the regions of the first concave side surfaces 1111 located on both sides of the tool center axis 200 are respectively the positioning portions and the non-positioning portions, the gap between the positioning portions and the corresponding first convex side surfaces 2111 is d6, the gap between the non-positioning portions and the corresponding first convex side surfaces 2111 is d5, the positioning portions of the two first concave side surfaces 1111 located on both sides of the tool center axis 200, the regions of the second concave side surfaces 1121 located on both sides of the tool center axis 200 are respectively the positioning portions and the non-positioning portions, the gap between the positioning portions and the corresponding second convex side surfaces 2121 is d3, the gap between the non-positioning portions and the corresponding second convex side surfaces 2121 is d4, and the positioning portions of the two second concave side surfaces 1121 located on both sides of the tool center axis 200, as shown in fig. 4, in order to ensure a large cutting force applied to the cutting member 1, it is possible to suppress the cutting member 11 from being loosened in the circumferential direction and the radial direction, and reduce the manufacturing difficulty of cutting member 1, clamping member 2, should satisfy: d5 is more than or equal to 0.05mm and less than or equal to 0.5mm, and d6 is 0; d3 is more than or equal to 0 and less than or equal to 0.05, d4 is more than or equal to 0.05mm and less than or equal to 0.5 mm; in this embodiment, d3 is 0, d4 is 0.25mm, d5 is 0.2mm, and d6 is 0.

In this embodiment, a central groove 114 is formed in a central region of the first recessed bottom surface 1112, a central post 214 is arranged in a central region of the first raised top surface 2112, when the cutting component 1 is mounted in place on the clamping component 2, the central post 214 and the central groove 114 are matched and positioned, and the positioning accuracy of the cutting component 1 and the clamping component 2 is further improved through the matching of the central post 214 and the central groove 114.

In this embodiment, the central groove 114 includes a groove bottom surface 1141 and a groove side surface 1142, the central column 214 includes a column top surface 2141 and an outer cylindrical surface 2142, the diameter of the cutting unit is D1, the diameter of the outer cylindrical surface 2142 is D2, when the cutting element 1 is mounted on the clamping element 2 in place, a gap is provided between the groove bottom surface 1141 and the column top surface 2141, and the diameter of the groove side surface 1142 is D2', in order to ensure the radial positioning accuracy of the cutting element 1 and ensure that the cutting element 1 has sufficient rigidity in the radial direction, it should be satisfied that: 0.05D1 is not less than D2 not less than 0.2D1, 0.05mm is not less than D2, and 0.2 'is not less than 0mm, in the embodiment, D1 is 40mm, D2 is 5mm, and D2' is 5.02 mm.

In this embodiment, the first recessed bottom surface 1112 is provided with two threaded connection holes 115 respectively located at two sides of the central groove 114, the first protruding top surface 2112 is provided with two cooling holes 215 respectively located at two sides of the central post 214, the drilling tool further includes two connecting members 5, one end of each connecting member 5 is in threaded connection with the threaded connection holes 115, the other end of each connecting member 5 is installed in the corresponding cooling hole 215 through a fastening member 6 to axially connect the cutting member 1 and the clamping member 2, and the connecting member 5 is provided with a cooling guide hole 51 corresponding to the cooling hole 215.

In this embodiment, the clamping groove 52 of the connecting member 5 includes two clamping groove side surfaces 521 and a clamping groove bottom surface 522 located between the two clamping groove side surfaces 521, the clamping groove side surfaces 521 are symmetrical with respect to a clamping groove center 523 of the clamping groove 52, an included angle between the two clamping groove side surfaces 521 is β, the clamping groove center 523 forms an offset d toward the cutting member 1 compared with the fastening center 61 of the corresponding fastening member 6, and in order to ensure that the cutting end surface 117 of the cutting member 1 and the clamping end surface 216 of the clamping member 2 are completely attached, it should be satisfied that: beta is more than or equal to 60 degrees and less than or equal to 100 degrees, and d is more than or equal to 0 and less than or equal to 0.2 mm. In this example, β is 80 ° and d is 0.1 mm.

In this embodiment, the cutting member 1 is configured to be attachable to and detachable from the center drill tip 3 by elastic engagement and disengagement of the cutting portion 12, and the cutting member 1 is configured to mount the outer cutting insert 4 in the pocket of the cutting member 1 by an insert fastener.

In addition to the above embodiments, according to the cutting length of the cutting member, the clamping recess and the clamping boss may be respectively designed on the clamping member and the cutting member, that is, the drilling tool includes the cutting member, the clamping member, the central drill tip and two outer cutting blades, the cutting member is provided with the cutting interface portion and the cutting portion, the clamping member is provided with the clamping interface portion and the clamping portion, the cutting interface portion is repeatedly assembled and disassembled on the clamping interface portion, the central drill tip and the outer cutting blades are respectively installed at the central and circumferential positions on the cutting portion, the two outer cutting blades are respectively installed at two sides of the central drill tip to form a complete cutting unit with the central drill tip, the cutting interface portion is provided with the first clamping boss and the second clamping boss which are mutually crossed, the clamping interface portion is provided with the first clamping recess and the second clamping recess which are mutually crossed, the outer side surface of the first clamping boss is smoothly connected with the circumferential surface of the cutting interface portion, the outer side surface of the second clamping boss is smoothly connected with the bottom surface of a chip removal groove of the cutting interface part, the first clamping recess penetrates through the peripheral surface of the clamping interface part, the second clamping recess penetrates through the bottom surface of the chip removal groove of the clamping interface part, and when the cutting part is installed on the clamping part in place, the first clamping boss is arranged in the first clamping recess, the second clamping boss is arranged in the second clamping recess and matched with the first clamping boss and the second clamping boss to realize circumferential positioning of the cutting part and the clamping part.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims

1. A drilling processing cutter comprises a cutting part (1), a clamping part (2), a central drill point (3) and two outer cutting blades (4), wherein the cutting part (1) is provided with a cutting interface part (11) and a cutting part (12), the clamping part (2) is provided with a clamping interface part (21) and a clamping part (22), the cutting interface part (11) can be repeatedly assembled and disassembled on the clamping interface part (21), the central drill point (3) and the outer cutting blades (4) are respectively arranged at the center and the circumferential positions of the cutting part (12), and the two outer cutting blades (4) are respectively arranged at the two sides of the central drill point (3) to form a complete cutting unit with the central drill point (3), and the drilling processing cutter is characterized in that: be equipped with intercrossing's first centre gripping recess (111) and second centre gripping recess (112) on cutting interface part (11), be equipped with intercrossing's first centre gripping boss (211) and second centre gripping boss (212) on centre gripping interface part (21), first centre gripping recess (111) run through cutting interface part (11) global, second centre gripping recess (112) run through the bottom surface of the chip groove of cutting interface part (11), the lateral surface of first centre gripping boss (211) with the global smooth connection of centre gripping interface part (21), the lateral surface of second centre gripping boss (212) with the bottom surface smooth connection of the chip groove of centre gripping interface part (21), when cutting member (1) is installed in place on clamping member (2), first centre gripping boss (211) are arranged in first centre gripping recess (111), second centre gripping boss (212) are arranged in and cooperate in second centre gripping recess (112) and realize the cutting interface part (2) are equipped with The cutting component (1) and the clamping component (2) are positioned, the first clamping recess (111) comprises two first recess side surfaces (1111) and a first recess bottom surface (1112), the first clamping boss (211) comprises two first protrusion side surfaces (2111) and a first protrusion top surface (2112), a central groove (114) is formed in the central area of the first recess bottom surface (1112), a central column (214) is arranged in the central area of the first protrusion top surface (2112), when the cutting component (1) is installed on the clamping component (2) in place, the central column (214) is matched and positioned with the central groove (114), two threaded connecting holes (115) respectively positioned at two sides of the central groove (114) are formed in the first recess bottom surface (1112), two cooling holes (215) respectively positioned at two sides of the central column (214) are formed in the first protrusion top surface (2112), the drilling machining tool further comprises two connecting pieces (5), one end of each connecting piece (5) is in threaded connection with the corresponding threaded connecting hole (115), the other end of each connecting piece is installed in the corresponding cooling hole (215) through a fastener (6) to achieve axial connection between the corresponding cutting part (1) and the corresponding clamping part (2), and a cooling guide hole (51) of the corresponding cooling hole (215) is formed in each connecting piece (5).

2. The drilling machining tool of claim 1, wherein: the second clamping recess (112) comprises two second concave side surfaces (1121) and a second concave bottom surface (1122), the second clamping boss (212) comprises two second convex side surfaces (2121) and a second convex top surface (2122), and when the cutting element (1) is mounted in place on the clamping element (2), the gap between the first concave bottom surface (1112) and the first convex top surface (2112) is d1, and the gap between the second concave bottom surface (1122) and the second convex top surface (2122) is d 1': d1 is not less than 0.05mm, d 1' is not less than 0.5 mm.

3. The drilling machining tool of claim 1, wherein: the first clamping recess (111) and the second clamping recess (112) are both arranged on the cutting end surface (117) of the cutting interface part (11), the first clamping boss (211) and the second clamping boss (212) are both arranged on the clamping end surface (216) of the clamping interface part (21), and when the cutting component (1) is mounted in place on the clamping component (2), a gap d2 between the cutting end surface (117) and the clamping end surface (216) is equal to 0.

4. The drilling machining tool of claim 2, wherein: the included angle between the first recess side surface (1111) and the second recess side surface (1121) is alpha, and the following conditions are satisfied: alpha is more than or equal to 80 degrees and less than or equal to 110 degrees.

5. The drilling machining tool of claim 2, wherein: during cutting, the regions of the first concave side surface (1111) at two sides of the tool center axis (200) are respectively a positioning part and a non-positioning part, the clearance between the positioning part and the corresponding first convex side surface (2111) is d6, the clearance between the non-positioning part and the corresponding first convex side surface (2111) is d5, the positioning parts of the two first concave side surfaces (1111) are respectively at two sides of the tool center axis (200), and the following requirements are met: d5 is not less than 0.05mm and not more than 0.5mm, and d6 is 0.

6. The drilling machining tool of claim 2, wherein: during cutting, the regions of the second concave side surfaces (1121) at two sides of the central axis (200) of the tool are respectively a positioning part and a non-positioning part, the gap between the positioning part and the corresponding second convex side surface (2121) is d3, the gap between the non-positioning part and the corresponding second convex side surface (2121) is d4, the positioning parts of the two second concave side surfaces (1121) are respectively at two sides of the central axis (200) of the tool, and the requirements are that: d3 is more than or equal to 0 and less than or equal to 0.05, and d4 is more than or equal to 0.05mm and less than or equal to 0.5 mm.

7. The drilling machining tool of any one of claims 1-6, characterized in that: the central groove (114) comprises a groove bottom surface (1141) and a groove side surface (1142), the central column (214) comprises a column top surface (2141) and an outer cylindrical surface (2142), the diameter of the cutting unit is D1, the diameter of the outer cylindrical surface (2142) is D2, and the following requirements are met: 0.05D1 is not less than D2 is not less than 0.2D 1.

8. The drilling machining tool of claim 7, wherein: when the cutting member (1) is mounted in place on the clamping member (2), a gap is arranged between the groove bottom surface (1141) and the column top surface (2141), and the diameter of the groove side surface (1142) is D2', which satisfies the following conditions: D2-D2' is less than or equal to 0.05mm and less than or equal to 0.05 mm.

9. The drilling machining tool of claim 1, wherein: the clamping groove (52) of the connecting piece (5) comprises two clamping groove side surfaces (521) and a clamping groove bottom surface (522) positioned between the two clamping groove side surfaces (521), the clamping groove side surfaces (521) are symmetrical relative to a clamping groove center (523) of the clamping groove (52), and an included angle between the two clamping groove side surfaces (521) is beta, and the requirements are that: beta is more than or equal to 60 degrees and less than or equal to 100 degrees.

10. The drilling machining tool of claim 9, wherein: the centre of the clamping groove (523) is deviated from the fastening centre (61) of the corresponding fastening piece (6) to the cutting part (1) by an offset d, and the following conditions are satisfied: d3 is more than or equal to 0 and less than or equal to 0.2 mm.