CN113953565B

CN113953565B - Drilling tool

Info

Publication number: CN113953565B
Application number: CN202111335766.1A
Authority: CN
Inventors: 江爱胜; 向良雄; 项兴东; 刘伟; 文娟; 蒋松松
Original assignee: Zhuzhou Cemented Carbide Cutting Tools Co Ltd
Current assignee: Zhuzhou Cemented Carbide Cutting Tools Co Ltd
Priority date: 2021-11-11
Filing date: 2021-11-11
Publication date: 2023-06-27
Anticipated expiration: 2041-11-11
Also published as: CN113953565A

Abstract

The invention discloses a drilling tool, which comprises a cutting part and a connecting part, wherein the clamping part comprises a clamping part and a handle part, the connecting part and the clamping part are matched to realize the connection of the cutting part and the clamping part, a spiral concave is arranged on the outer circumferential surface of the connecting part, a positioning boss coaxial with the outer circumferential surface is arranged on the end surface of the connecting part, a spiral bulge is arranged on the inner circumferential surface of the clamping part, a positioning inner hole coaxial with the inner circumferential surface is arranged on the bottom surface of the clamping part, when the cutting part and the clamping part are assembled in place, the spiral concave is matched with the spiral bulge, the outer circumferential surface is in interference fit with the inner circumferential surface, and the outer cylindrical surface of the positioning boss is in interference fit with the inner cylindrical surface of the positioning inner hole and has interference t, so that: the drilling tool has the advantages of convenience in assembly and disassembly, high positioning precision, stability, reliability and the like, and t is more than or equal to 0.005mm and less than or equal to 0.01mm.

Description

Drilling 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 cemented carbide or similar materials are generally used as tool materials, and the materials have the characteristics of high hardness and good wear resistance, so that the machining is extremely difficult, and the cost of the drilling tool materials and the machining cost are high.

In the prior art, the drilling tool is generally assembled by a cutting member and a clamping member, wherein the cutting member is made of hard alloy or similar materials with high hardness and high wear resistance, and the clamping member is made of materials with high elasticity, so that the cutting member can be independently replaced after being worn, and the drilling cost can be reduced. However, the cutter adopts a two-piece type clamping structure generally, the clamping and positioning are realized by using the elastic deformation of the clamping mechanism to open a tiny included angle, the positioning strength is low, the cutting part is easy to fall off, and the service life of the clamping part is short.

For example, chinese patent document CN 109262027a discloses a drilling tool with stable clamping, in which the outer circumferential surface of the cutting member and the inner circumferential surface of the clamping member have variable interference, and the outer circumferential surface and inner circumferential surface fit essentially means clearance interference fit of the inner hole wall and the outer cylinder, and in the process of torquing, the clearance fit is performed first, then the interference fit is performed, and finally the clearance fit is performed. When the inner peripheral surface and the outer peripheral surface are used for interference clamping, although the peripheral surface can be used for interference clamping, the peripheral surface has smaller interference radian, the peripheral surface has limited interference contact area, the tool bit cannot be clamped very firmly, vibration is easy to generate during large feeding and cutting, and the surface quality of a machined hole is reduced, and the aperture tolerance and consistency are poor.

In addition, chinese patent document CN105537654a discloses a drilling tool, where the recess and projection fit essentially refers to a clearance interference fit of the thread profile, during the torquing process, the clearance fit is first followed by the interference fit, and finally the clearance fit is reached, and the negative clearance refers to the interference. When the screw thread interference clamping is adopted, although the screw thread interference clamping can be realized, the screw thread pitch diameter interference dimension accurate control difficulty is larger, meanwhile, the screw thread interference position is generated at two sides of a screw thread profile, the circumferential center capacity of a small tool bit with a small contact area is poor, the axial positioning surfaces are in complete contact, the axial and circumferential runout precision of the tool bit is difficult to ensure during batch installation, and the screw thread interference can only realize the clamping of a cutting part and cannot center centering.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art, and provide the drilling tool which is convenient to assemble and disassemble, high in positioning precision, stable and reliable.

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

the utility model provides a drilling processing cutter, includes cutting member and clamping part, cutting member and clamping part are symmetrical about split type drilling processing cutter's center pin, cutting member includes cutting portion and connecting portion, clamping part includes clamping part and stalk portion, connecting portion and clamping part cooperation realize cutting member and clamping part's connection, be equipped with spiral concave recess on the outer peripheral face of connecting portion, be equipped with on the terminal surface of connecting portion with the coaxial location boss of outer peripheral face, be equipped with spiral protruding on the inner peripheral face of clamping part, offer on the bottom surface of clamping part with the coaxial location hole of inner peripheral face, when cutting member and clamping part assemble in place, spiral concave recess with spiral protruding cooperation, the outer peripheral face with inner peripheral face interference fit, the outer cylindrical face of location boss with the inner cylindrical face interference fit of location hole just has interference t, should satisfy: t is more than or equal to 0.005mm and less than or equal to 0.01mm.

As a further improvement of the above technical scheme:

in the assembly process of the cutting part and the clamping part, the outer peripheral surface and the inner peripheral surface have variable interference, and the interference t1 is satisfied: -t 1 is less than or equal to 0.05mm and less than or equal to 0.1mm.

The cutting part is equipped with the axial locating surface with connecting portion juncture, be equipped with the axial face that corresponds with the axial locating surface on the clamping part, when cutting part and clamping part assembly are put in place, clearance h3=0 between axial locating surface and the axial face.

The cutting part is provided with a torque transmission surface, the clamping part is provided with two circumferential surfaces corresponding to the torque transmission surfaces respectively, and when the cutting part and the clamping part are assembled in place, the gap between the torque transmission surface and the circumferential surfaces is t3 and meets the following requirements: t3 is more than or equal to 0 and less than or equal to 0.05mm.

When the spiral concave groove is matched with the spiral convex groove in place, the maximum circumferential torsion angle of the cutting part is gamma, and the requirements are satisfied: gamma is more than or equal to 70 degrees and less than or equal to 130 degrees.

When the cutting part and the clamping part are assembled in place, the clearance between the end face of the positioning boss and the bottom face of the positioning inner hole is h1, and the following requirements are satisfied: h1 is more than 0 and less than or equal to 0.2mm.

When the cutting component and the clamping component are assembled in place, the gap between the end face of the connecting part and the bottom face of the clamping part is h2, and the following conditions are satisfied: h2 is more than 0 and less than or equal to 0.2mm.

The radius of the positioning boss is R2, and the radius of the connecting part is R, so that the following conditions are satisfied: r is more than or equal to 4mm and less than or equal to 32mm, R2 is more than or equal to 0.3R and less than or equal to 0.7R.

The distance between the end face of the connecting part and the axial positioning surface is L, and the distance between the end face of the connecting part and the end face of the positioning boss is L1, and the following requirements are satisfied: l is more than or equal to 4mm and less than or equal to 15mm, L1 is more than or equal to 0.2L and less than or equal to 0.4L.

The end face of the connecting part and the outer cylindrical surface are provided with round chamfers with the radius of R1, and inclined chamfers with the angle of A are arranged between the end face of the positioning boss and the outer cylindrical surface, so that the following conditions are satisfied: r1 is more than or equal to 0.5mm and less than or equal to 2mm, A is more than or equal to 30 degrees and less than or equal to 60 degrees.

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

according to the drilling tool, the spiral concave is arranged on the outer peripheral surface of the connecting part, the positioning boss coaxial with the outer peripheral surface is arranged on the end surface of the connecting part, the spiral protrusion is arranged on the inner peripheral surface of the clamping part, the positioning inner hole coaxial with the inner peripheral surface is arranged on the bottom surface of the clamping part, when the cutting part and the clamping part are assembled in place, the spiral concave is matched with the spiral protrusion, the outer peripheral surface is in interference fit with the inner peripheral surface, the outer cylindrical surface of the positioning boss is in interference fit with the inner cylindrical surface of the positioning inner hole, and the interference t is satisfied: the cutting part is not less than 0.005mm and not more than 0.01mm, the spiral concave recess and the spiral convex are matched, the cutting part is not fallen off, the outer peripheral surface and the inner peripheral surface are in interference fit, the outer peripheral surface of the positioning boss and the inner cylindrical surface of the positioning inner hole are in interference fit, a double interference fit structure is adopted, when cutting is carried out, the inner peripheral surface of the clamping part bears radial force, the inner cylindrical surface at the bottom can share radial force generated during cutting, positioning strength and precision are higher, the radial force during cutting can be better dispersed, cutting is more stable, the matching of the outer peripheral surface, the inner peripheral surface and the positioning boss and the positioning inner hole is 360 degrees, interference contact area is increased, the problems that positioning precision is poor, the service life of the clamping part is short and the like due to deformation of the two-piece elastic structure are easily generated in use are effectively avoided, the matching of the positioning boss and the positioning inner hole can play a role of centering correction on the cutting part, the cutting part can be more accurately centered, the assembly precision is improved, and the interference t meets the requirement: t is more than or equal to 0.005mm and less than or equal to 0.01mm, so that the interference fit can be realized, and the manufacturing difficulty of the drilling tool can not be improved.

Drawings

Fig. 1 is a perspective view of a drilling tool according to the present invention.

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

Fig. 3 is a left side view of the drilling tool of the present invention.

Fig. 4 is a cross-sectional view A-A of fig. 2.

Fig. 5 is a B-B cross-sectional view of fig. 3.

Fig. 6 is a perspective view of the cutting member of the drilling tool of the present invention.

Fig. 7 is a front view of the cutting member of the drilling tool of the present invention.

Fig. 8 is a partial schematic view at F in fig. 7.

Fig. 9 is a G-G cross-sectional view of fig. 7.

Fig. 10 is a sectional view of E-E of fig. 7.

Fig. 11 is a perspective view of the clamping member of the drilling tool of the present invention.

Fig. 12 is a top view of the drill tool holding member of the present invention.

Fig. 13 is a C-C cross-sectional view of fig. 12.

The reference numerals in the drawings denote:

1. a cutting member; 11. a cutting portion; 111. an axial locating surface; 12. a connection part; 121. an outer peripheral surface; 122. spiral recess; 13. positioning the boss; 131. an outer cylindrical surface; 14. a torque transmitting surface; 2. a clamping member; 21. a clamping part; 211. an inner peripheral surface; 212. spiral bulges; 213. an axial face; 214. a circumferential surface; 22. a handle; 23. positioning an inner hole; 231. an inner cylindrical surface; 9. a central axis.

Detailed Description

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

Fig. 1 to 13 show an embodiment of a drilling tool according to the present invention, the drilling tool comprises a cutting member 1 and a clamping member 2, the cutting member 1 and the clamping member 2 are symmetrical about a central axis 9 of the split drilling tool, the cutting member 1 comprises a cutting portion 11 and a connecting portion 12, the clamping member 2 comprises a clamping portion 21 and a shank 22, the connecting portion 12 and the clamping portion 21 cooperate to realize connection of the cutting member 1 and the clamping member 2, a spiral recess 122 is provided on an outer circumferential surface 121 of the connecting portion 12, a positioning boss 13 coaxial with the outer circumferential surface 121 is provided on an end surface of the connecting portion 12, a spiral protrusion 212 is provided on an inner circumferential surface 211 of the clamping portion 21, a positioning inner hole 23 coaxial with the inner circumferential surface 211 is provided on a bottom surface of the clamping portion 21, the spiral recess 122 cooperates with the spiral protrusion 212 when the cutting member 1 and the clamping member 2 are assembled in place, the outer circumferential surface 121 cooperates with the inner circumferential surface 211 in an interference manner, and an outer cylindrical surface 131 of the positioning boss 13 cooperates with an inner cylindrical surface 231 of the positioning inner hole 23 in an interference amount t, which is satisfied: the fit of the spiral concave 122 and the spiral convex 212 is less than or equal to 0.005mm and less than or equal to 0.01mm, so that the cutting part is not fallen off, the outer circumferential surface 121 and the inner circumferential surface 211 are in interference fit, the outer circumferential surface 131 of the positioning boss 13 and the inner cylindrical surface 231 of the positioning inner hole 23 are in interference fit, a double interference fit structure is adopted, when cutting is carried out, the inner circumferential surface 211 of the clamping part 2 bears radial force, the inner cylindrical surface 231 at the bottom can share the radial force generated during cutting, the positioning strength and the precision are higher, the radial force during cutting can be better dispersed, the cutting is more stable, the interference supporting radian is increased, meanwhile, the interference contact area is increased, the problems that the positioning precision is poor, the service life of the clamping part 2 is short and the like due to easy deformation of the two-piece elastic structure in use are effectively avoided, the matching of the positioning boss 13 and the positioning inner hole 23 can play a guiding and correcting role on the cutting part 1, the cutting part 1 can be more accurately centered, the assembly precision is improved, and the interference t meets the requirements: t is more than or equal to 0.005mm and less than or equal to 0.01mm, so that the interference fit can be realized, and the manufacturing difficulty of the drilling tool can not be improved.

During the assembly of the cutting member 1 and the clamping member 2, the outer peripheral surface 121 and the inner peripheral surface 211 have a varying interference t1, and the interference t1 should satisfy: -0.1mm < t1 < 0.05mm, facilitating installation and increasing the positioning strength of the cutting member 1 and the clamping member 2 as the cutting force increases during use of the tool, in this embodiment t1= -0.05 when initial assembly and t1=0.03 when assembled in place.

In this embodiment, the juncture of the cutting portion 11 and the connecting portion 12 is provided with an axial positioning surface 111, the clamping portion 21 is provided with an axial surface 213 corresponding to the axial positioning surface 111, and when the cutting member 1 and the clamping member 2 are assembled in place, a gap h3=0 between the axial positioning surface 111 and the axial surface 213 is ensured to ensure the axial positioning strength and accuracy.

In this embodiment, the cutting portion 11 is provided with a torque transmission surface 14, the clamping portion 21 is provided with two circumferential surfaces 214 corresponding to the two torque transmission surfaces 14, and when the cutting member 1 and the clamping member 2 are assembled in place, the gap between the torque transmission surface 14 and the circumferential surfaces 214 is t3, which should be satisfied: t3 is 0-0.05 mm to ensure that the screw recess 122 and the screw protrusion 212 and the outer cylindrical surface 131 and the inner cylindrical surface 231 can completely achieve an interference fit, in this embodiment t3=0.03 mm.

In order to ensure that the cutting member 1 can be easily assembled and disassembled and to ensure that the clamping member 2 has sufficient strength for clamping the cutting member 1, when the spiral recess 122 is matched with the spiral protrusion 212 in place, the maximum circumferential twist angle of the cutting member 1 is gamma, and the following conditions should be satisfied: 70 ° - γ -130 °, in this example γ=100°.

When the cutting member 1 and the clamping member 2 are assembled in place, the clearance between the end surface of the positioning boss 13 and the bottom surface of the positioning inner hole 23 is h1, which should satisfy: 0< h1.ltoreq.0.2 mm, h1=0.1 mm in this example.

When the cutting member 1 and the clamping member 2 are assembled in place, the clearance h2 between the end surface of the connecting portion 12 and the bottom surface of the clamping portion 21 should be satisfied: h2 is more than 0 and less than or equal to 0.2mm. In this example, h2=0.1 mm.

The radius of the positioning boss 13 is R2, and the radius of the connecting portion 12 is R, so that: r2 is 0.3 r.ltoreq.0.7r, in this example r=18 mm, r2=8 mm.

The distance between the end face of the connecting portion 12 and the axial positioning face 111 is L, and the distance between the end face of the connecting portion 12 and the end face of the positioning boss 13 is L1, which should satisfy: l is more than or equal to 4mm and less than or equal to 15mm, L1 is more than or equal to 0.2L and less than or equal to 0.4L. In this example, l=7mm, l1=2mm.

For convenient installation, a round chamfer with a radius of R1 is arranged between the end face of the connecting part 12 and the outer cylindrical surface 131, and an inclined chamfer with an angle of A is arranged between the end face of the positioning boss 13 and the outer cylindrical surface 131, so that the following conditions are satisfied: r1 is more than or equal to 0.5mm and less than or equal to 2mm, A is more than or equal to 30 degrees and less than or equal to 60 degrees. In this example, r1=1 mm, a=40°.

While the invention has been described in terms of preferred embodiments, it is not intended to be limiting. Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art, or equivalent embodiments with equivalent variations can be made, without departing from the scope of the invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. Drilling machining tool, including cutting member (1) and clamping member (2), cutting member (1) and clamping member (2) are symmetrical about center pin (9) of split type drilling machining tool, cutting member (1) include cutting portion (11) and connecting portion (12), clamping member (2) include clamping portion (21) and stalk portion (22), connecting portion (12) and clamping portion (21) cooperation realize the connection of cutting member (1) and clamping member (2), its characterized in that: the utility model discloses a cutting device, including connecting portion (12), connecting portion, outer peripheral face (121) of connecting portion (12), connecting portion (12) are equipped with spiral concave recess (122), be equipped with on the terminal surface of connecting portion (12) with outer peripheral face (121) coaxial location boss (13), be equipped with spiral protrusion (212) on inner peripheral face (211) of clamping portion (21), offered on the bottom surface of clamping portion (21) with inner peripheral face (211) coaxial location hole (23), when cutting member (1) and clamping member (2) assemble in place, spiral concave recess (122) with spiral protrusion (212) cooperation, outer peripheral face (121) with inner peripheral face (211) interference fit, outer cylinder (131) of location boss (13) with inner cylindrical face (231) interference fit and have interference value t, should satisfy: in the assembly process of the cutting part (1) and the clamping part (2), the outer peripheral surface (121) and the inner peripheral surface (211) have variable interference, and the interference t1 is as follows: -t 1 is less than or equal to 0.05mm and less than or equal to 0.1mm.

2. The drilling tool according to claim 1, wherein: the cutting part (11) and the connecting part (12) are provided with axial locating surfaces (111), the clamping part (21) is provided with axial surfaces (213) corresponding to the axial locating surfaces (111), and when the cutting part (1) and the clamping part (2) are assembled in place, a gap h3=0 between the axial locating surfaces (111) and the axial surfaces (213).

3. The drilling tool according to claim 1, wherein: the cutting part (11) is provided with a torque transmission surface (14), the clamping part (21) is provided with two circumferential surfaces (214) corresponding to the two torque transmission surfaces (14), and when the cutting part (1) and the clamping part (2) are assembled in place, a gap between the torque transmission surface (14) and the circumferential surfaces (214) is t3, and the following requirements are satisfied: t3 is more than or equal to 0 and less than or equal to 0.05mm.

4. A drilling tool according to any one of claims 1 to 3, characterized in that: when the spiral concave groove (122) and the spiral convex groove (212) are matched in place, the maximum circumferential torsion angle of the cutting part (1) is gamma, and the requirements are that: gamma is more than or equal to 70 degrees and less than or equal to 130 degrees.

5. A drilling tool according to any one of claims 1 to 3, characterized in that: when the cutting part (1) and the clamping part (2) are assembled in place, a gap between the end face of the positioning boss (13) and the bottom face of the positioning inner hole (23) is h1, and the following conditions are satisfied: h1 is more than 0 and less than or equal to 0.2mm.

6. The drilling tool as recited in claim 5, wherein: when the cutting member (1) and the clamping member (2) are assembled in place, a gap h2 between the end face of the connecting portion (12) and the bottom face of the clamping portion (21) should satisfy: h2 is more than 0 and less than or equal to 0.2mm.

7. A drilling tool according to any one of claims 1 to 3, characterized in that: the radius of the positioning boss (13) is R2, and the radius of the connecting part (12) is R, so that the following conditions are satisfied: r is more than or equal to 4mm and less than or equal to 32mm, R2 is more than or equal to 0.3R and less than or equal to 0.7R.

8. The drilling tool according to claim 2, wherein: the distance between the end face of the connecting part (12) and the axial positioning surface (111) is L, and the distance between the end face of the connecting part (12) and the end face of the positioning boss (13) is L1, which is satisfied: l is more than or equal to 4mm and less than or equal to 15mm, L1 is more than or equal to 0.2L and less than or equal to 0.4L.

9. A drilling tool according to any one of claims 1 to 3, characterized in that: the end face of the connecting part (12) and the outer cylindrical surface (131) are provided with round chamfers with the radius of R1, and the end face of the positioning boss (13) and the outer cylindrical surface (131) are provided with inclined chamfers with the angle of A, so that the following conditions are satisfied: r1 is more than or equal to 0.5mm and less than or equal to 2mm, A is more than or equal to 30 degrees and less than or equal to 60 degrees.