CN113953564A

CN113953564A - Split type drilling machining cutter

Info

Publication number: CN113953564A
Application number: CN202111335744.5A
Authority: CN
Inventors: 项兴东; 江爱胜; 向良雄; 李鸿磊; 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: 2022-01-21

Abstract

The invention discloses a split drilling processing cutter, wherein a cutting part comprises a cutting part and a connecting part, 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, the peripheral surface of the connecting part comprises a plurality of positioning outer peripheral surfaces and circumferential clearance surfaces which are arranged at intervals, recessed bayonets are arranged on the positioning outer peripheral surfaces, closed positioning grooves which extend axially, pin holes which extend radially and pins arranged in the pin holes are arranged on the clamping part, when the cutting part and the clamping part are assembled, the positioning outer peripheral surfaces are inserted into the closed positioning grooves axially through the clearance inner peripheral surfaces, after the cutting part rotates for a certain angle in the circumferential direction, the positioning outer peripheral surfaces are in interference fit with the positioning inner peripheral surfaces, the interference magnitude of the positioning outer peripheral surfaces and the positioning inner peripheral surfaces is changed in the circumferential rotation process of the cutting part, and the front ends of the pins are matched with the recessed bayonets, the invention has the advantages of high positioning precision, convenient assembly and disassembly and the like.

Description

Split type drilling machining cutter

Technical Field

The invention mainly relates to the field of metal cutting machining, in particular to a split type 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 the tool material, and the material has the characteristics of high hardness and good wear resistance, so that the processing is extremely difficult, and the material cost and the processing cost of the drilling tool are high.

In the prior art, a drilling tool is generally assembled by a cutting part and a clamping part, wherein the cutting part is made of hard alloy or similar materials with high hardness and wear resistance, and the clamping part is made of materials with high elasticity, so that the cutting part can be independently replaced after being worn, thereby reducing the cost of drilling. However, such a cutting tool generally adopts a two-piece type clamping structure, clamping and positioning are realized by opening a small included angle through elastic deformation of the clamping mechanism, the positioning strength is not high, the cutting part is easy to fall off, and the service life of the clamping part is short.

For example, chinese patent document CN109262027A discloses a drilling tool, in which a central portion of an outer peripheral surface and a central portion of an inner peripheral surface are respectively provided with a recess and a projection which are engaged with each other, and a distance between a center line of the recess and the projection and an axial positioning surface is set to be interference fit. The recess sets up on the two-piece structure of clamping part, along with the fatigue deformation of the piece formula structure that the recess is located in work, the precision loses very fast, clamping part's life-span is short.

In addition, chinese patent document CN111054951A discloses a split type rotary machining tool, in which a clamping portion is provided with a closed positioning groove, a clamping recess and an excessive inner hole. The clamping part is provided with a spiral groove which corresponds to the chip groove and extends to the handle part. The scheme adopts a closed positioning groove structure, and can solve the problem of short service life of a clamping part, but the clamping part is an over-positioning clamping in nature and is difficult to manufacture; secondly, the positioning groove is short due to structural influence, and the circumferential centering capacity of the tool bit is poor; again, when the diameter of the cutting member is small, the clamping boss structure on the connecting portion is difficult to achieve, and the diameter of the cutting member is limited.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a split type drilling machining tool which is high in positioning precision, convenient to assemble and disassemble, long in tool bar service life and convenient to manufacture.

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

a split type drilling machining cutter comprises a cutting part and a clamping part, wherein the cutting part and the clamping part are symmetrical about a central axis of the split type drilling machining cutter, the cutting part comprises a cutting part and a connecting part, the clamping part comprises a clamping part and a handle part, the connecting part and the clamping part are matched to realize connection of the cutting part and the clamping part, the peripheral surface of the connecting part comprises a plurality of positioning peripheral surfaces and circumferential clearance avoiding surfaces which are arranged at intervals, recessed bayonets are formed in the positioning peripheral surfaces, axially extending closed positioning grooves, radially extending pin holes and pins arranged in the pin holes are formed in the clamping part, when the cutting part and the clamping part are assembled, the positioning peripheral surfaces are inserted into the closed positioning grooves along the axial direction through the clearance inner peripheral surfaces, and the cutting part rotates for a certain angle in the circumferential direction, the positioning outer circumferential surface is in interference fit with the positioning inner circumferential surface, the positioning outer circumferential surface and the positioning inner circumferential surface have variable interference in the circumferential rotation process of the cutting part, and the front end of the pin is matched with the recessed bayonet.

As a further improvement of the above technical solution:

when the cutting component and the clamping component are assembled in place, the outer diameter of the positioning outer peripheral surface is d1, the hole diameter of the positioning inner peripheral surface is d2, and the following requirements are met: d1-d2 is more than or equal to 0 and less than or equal to 0.03 mm.

After the positioning outer peripheral surface is axially inserted into the closed positioning groove through the clearance inner peripheral surface and after the cutting component is circumferentially rotated by an angle C, the positioning outer peripheral surface is in interference fit with the positioning inner peripheral surface, and the requirements are met: c is more than or equal to 60 degrees and less than or equal to 100 degrees.

The positioning inner circumferential surface and the clearance inner circumferential surface are symmetrically arranged at intervals, the positioning outer circumferential surface and the circumferential clearance surface are also symmetrically arranged at intervals, and the number M of the positioning outer circumferential surfaces, the number N of the circumferential clearance surfaces, the number P of the positioning inner circumferential surfaces and the number Q of the clearance inner circumferential surfaces meet the following requirements: 2 ≦ M ≦ N ═ P ≦ Q ≦ 4.

The pin is installed in the pin hole in advance, when the positioning outer peripheral surface is inserted into the closed positioning groove through the clearance inner peripheral surface, a gap T3 exists between the circumferential clearance surface and the end part of the pin, and the requirements that: t3 is more than or equal to 0.05mm and less than or equal to 0.2 mm.

The cutting part is provided with two torque transmission surfaces, the clamping part is provided with two circumferential surfaces corresponding to the torque transmission surfaces, and when the cutting part and the clamping part are assembled in place, a gap T4 between the torque transmission surfaces and the circumferential surfaces is equal to 0.

Cutting portion and connecting portion juncture are equipped with the axial positioning face, be equipped with the axial face that corresponds with the axial positioning face on the clamping part, when cutting part and clamping part assembly target in place, clearance between axial positioning face and the axial face is T2, the axial length of connecting portion is L2, the axial degree of depth of sealing the constant head tank is L3, should satisfy: t2 is 0, L3-L2 is 0.05mm ≤ 1.0 mm.

The cutting portion is provided with two chip grooves, and the clamping portion is provided with spiral grooves which correspond to the chip grooves and extend to the handle portion.

The diameter of the outer peripheral surface of the cutting part is D, the minimum thickness between two chip grooves is L1, and the following conditions are met: d1 is more than or equal to 0.15D and less than or equal to 0.32D, and L1-D1 is more than or equal to 1mm and less than or equal to 3.0 mm.

The top of sealing the constant head tank is equipped with interior chamfer, be equipped with outer chamfer on the connecting portion, interior chamfer and outer chamfer can be used to realize the centering in advance.

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

the split drilling tool of the invention has the advantages that when the cutting part and the clamping part are assembled, the positioning outer peripheral surface is axially inserted into the closed positioning groove through the clearance inner peripheral surface, after the cutting part rotates in the circumferential direction for a certain angle, the positioning outer peripheral surface is in interference fit with the positioning inner peripheral surface, the interference between the positioning outer peripheral surface and the positioning inner peripheral surface is changed in the circumferential rotation process of the cutting part, the closed positioning groove is arranged on the clamping part, the problems of poor positioning precision, short service life of the clamping part and the like caused by easy deformation of a two-piece elastic structure in use are effectively avoided, the positioning outer peripheral surfaces are arranged in a plurality and are in interference fit with the positioning inner peripheral surface, the circumferential positioning strength and precision are effectively ensured, the connecting part and the clamping part are simple in structure and convenient to process, the front end of a pin is matched with a concave bayonet, the anti-falling function of the cutting part is effectively realized, and the stability and the safety of the split drilling tool in use are ensured, and the assembly and disassembly are convenient.

Drawings

Fig. 1 is a perspective view of a first embodiment of the split drilling tool of the present invention.

Fig. 2 is a perspective view of a cutting member in a first embodiment of the split type drilling tool of the present invention.

Fig. 3 is a perspective view of a holder in a first embodiment of the split type drilling tool of the present invention.

Fig. 4 is a front view of a first embodiment of the split drilling tool of the present invention.

Fig. 5 is a sectional view a-a of fig. 4.

Fig. 6 is a sectional view B-B of fig. 4.

Fig. 7 is a left side view of fig. 4.

Fig. 8 is a front view of a cutting member in a first embodiment of the split drilling tool of the present invention.

Fig. 9 is a right side view of the cutting member in the first embodiment of the split drilling tool of the present invention.

Fig. 10 is a schematic view of the installation of the first embodiment of the split drilling tool of the present invention.

Fig. 11 is a left side view of fig. 10.

Fig. 12 is a cross-sectional view C-C of fig. 10.

Fig. 13 is a perspective view of a second embodiment of the split drilling tool of the present invention.

Fig. 14 is a perspective view of a holder in a second embodiment of the split drilling tool of the present invention.

Fig. 15 is a front view of a cutting member in a third embodiment of the split drilling tool of the present invention.

Fig. 16 is a right side view of a cutting member in a third embodiment of the split drilling tool of the present invention.

The reference numerals in the figures denote:

1. a cutting member; 11. a cutting portion; 111. an axial positioning surface; 12. a connecting portion; 121. positioning the peripheral surface; 122. a circumferential void-avoiding surface; 123. recessing the bayonet; 124. chamfering the outer part; 13. a chip pocket; 14. a torque transmitting surface; 2. a clamping member; 21. a clamping portion; 211. sealing the positioning groove; 2111. positioning the inner circumferential surface; 2112. a clearance inner peripheral surface; 2113. inner chamfering; 212. a pin hole; 213. an axial face; 214. a circumferential surface; 22. a handle; 25. a helical groove; 26. a blade; 27. a blade mounting groove; 3. a pin; 9. a central axis.

Detailed Description

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

Fig. 1 to 12 show a first embodiment of the split drilling tool of the present invention, which comprises a cutting member 1 and a clamping member 2, wherein the cutting member 1 and the clamping member 2 are symmetrical with respect to 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 handle portion 22, the connecting portion 12 and the clamping portion 21 cooperate to realize the connection between the cutting member 1 and the clamping member 2, the circumferential surface of the connecting portion 12 comprises a plurality of positioning outer circumferential surfaces 121 and circumferential clearance surfaces 122 arranged at intervals, a recessed bayonet 123 is arranged on the positioning outer circumferential surfaces 121, a closed positioning groove 211 extending axially, a pin hole 212 extending radially and a pin 3 arranged in the pin hole 212 are arranged on the clamping portion 21, when the cutting member 1 and the clamping member 2 are assembled, the positioning outer circumferential surfaces 121 are inserted into the closed positioning groove 211 axially through the clearance inner circumferential surfaces 2112, after the cutting component 1 rotates in the circumferential direction by a certain angle, the positioning outer peripheral surface 121 is in interference fit with the positioning inner peripheral surface 2111, the positioning outer peripheral surface 121 and the positioning inner peripheral surface 2111 have changed interference in the circumferential rotation process of the cutting component 1, the clamping portion 21 is provided with the closed positioning groove 211, the problems that the positioning accuracy is poor, the service life of the clamping component is short and the like due to the fact that the two-piece elastic structure is easy to deform in use are effectively solved, the positioning outer peripheral surfaces 121 are arranged in a plurality and are in interference fit with the positioning inner peripheral surface 2111, the circumferential positioning strength and accuracy are effectively guaranteed, the connecting portion 12 and the clamping portion 21 are simple in structure and convenient to machine, the front end of the pin 3 is matched with the recessed bayonet 123, the anti-falling function of the cutting component 1 is effectively achieved, the stability and the safety of the split drilling cutter in use are guaranteed, and the assembly and disassembly are convenient.

In order to ensure that the positioning outer circumferential surface 121 and the positioning inner circumferential surface 2111 are in interference fit, when the cutting component 1 and the clamping component 2 are assembled in place, on any radial section, the outer diameter of the positioning outer circumferential surface 121 is d1, and the bore diameter of the positioning inner circumferential surface 2111 is d2, which should satisfy the following conditions: d1-d2 is not less than 0 and not more than 0.03mm, in the embodiment, d2 is 4.29mm, and d1 is 4.3 mm.

In order to ensure the circumferential dimension and the positioning strength of the positioning outer circumferential surface 121, after the positioning outer circumferential surface 121 is axially inserted into the closed positioning groove 211 through the clearance inner circumferential surface 2112, and after the cutting component 1 rotates by the circumferential rotation angle C, the positioning outer circumferential surface 121 and the positioning inner circumferential surface 2111 are in interference fit, the following requirements are met: c is 60 ° or more and 100 ° or less, and in this embodiment, C is 90 °.

The positioning inner circumferential surfaces 2111 and the clearance inner circumferential surfaces 2112 are symmetrically arranged at intervals, the positioning outer circumferential surfaces 121 and the circumferential clearance surfaces 122 are also symmetrically arranged at intervals, and the number M of the positioning outer circumferential surfaces 121, the number N of the circumferential clearance surfaces 122, the number P of the positioning inner circumferential surfaces 2111 and the number Q of the clearance inner circumferential surfaces 2112 satisfy: in order to ensure the centering effect, M ═ N ═ P ═ Q ≦ 4, in this embodiment, M ═ N ═ P ═ Q ═ 2.

The pin 3 is installed in the pin hole 212 in advance, and when the location outer peripheral face 121 inserted the closed positioning groove 211 through the clearance inner peripheral face 2112, there was clearance T3 in the tip of circumference clearance face 122 and pin 3, does not produce the interference with the pin 3 of installing in advance when guaranteeing that connecting portion 12 inserted closed positioning groove 211, and guarantees that the pin 3 can realize the anti-drop function, should satisfy: t3 is more than or equal to 0.05mm and less than or equal to 0.2mm, and in the embodiment, T3 is 0.1 mm.

In this embodiment, the cutting portion 11 is provided with two torque transmission surfaces 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, a gap T4 between the torque transmission surfaces 14 and the circumferential surfaces 214 is equal to 0, so that the positioning strength and the positioning accuracy are further ensured by the close fit between the torque transmission surfaces 14 and the circumferential surfaces 214.

Cutting portion 11 is equipped with axial positioning face 111 with connecting portion 12 juncture, be equipped with the axial face 213 that corresponds with axial positioning face 111 on the holder 21, when cutting member 1 and clamping member 2 assembled in place, the clearance between axial positioning face 111 and the axial face 213 is T2, T2 is 0, guarantee axial positioning intensity and precision, the axial length of connecting portion 12 is L2, the axial depth of closing constant head tank 211 is L3, for the bottom of guaranteeing connecting portion 12 and closing constant head tank 211 contactless, should satisfy: L3-L2 is not less than 0.05mm and not more than 1.0mm, in the embodiment, L3 is 8.3mm, and L2 is 8 mm.

In the present embodiment, two chip pockets 13 are provided in the cutting portion 11, and a spiral groove 25 extending toward the shank portion 22 is provided in the clamping portion 21 so as to correspond to the chip pockets 13.

In order to ensure the positioning strength and accuracy of the connecting portion 12, the diameter of the outer peripheral surface of the cutting portion 11 is D, and the minimum thickness between the two chip flutes 13 is L1, which should satisfy the following conditions: d1 is not less than 0.15D and not more than 0.32D, L1-D1 is not less than 1mm and not more than 3.0mm, in the embodiment, D is 19mm, and L1 is 5.94 mm.

In this embodiment, the top end of the closed positioning slot 211 is provided with an inner chamfer 2113, the connecting portion 12 is provided with an outer chamfer 124, and the inner chamfer 2113 and the outer chamfer 124 can be used for realizing pre-centering, so as to facilitate installation.

Fig. 13 to 14 show a second embodiment of the split drilling tool of the present invention, which is substantially identical to the first embodiment except for the following: in this embodiment, the spiral groove 25 is composed of multiple sections, two blade mounting grooves 27 are formed in the clamping member 2, and the blades 26 are mounted and then combined with the cutting member 1 to form a complete cutting edge, so that the application range of the split drilling tool is further expanded.

Fig. 15 to 16 show a third embodiment of the split drilling tool of the present invention, which is substantially identical to the first embodiment except that: in this embodiment, the number M of the positioning outer peripheral surfaces 121, the number N of the circumferential clearance surfaces 122, the number P of the positioning inner peripheral surfaces 2111, and the number Q of the clearance inner peripheral surfaces 2112 are all 3, so that the centering effect and the positioning strength of the split drilling tool are further improved.

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. The utility model provides a split type drilling processing cutter, includes cutting member (1) and clamping part (2), cutting member (1) and clamping part (2) are symmetrical about the center pin (9) of split type drilling processing cutter, cutting member (1) includes cutting portion (11) and connecting portion (12), clamping part (2) include clamping part (21) and stalk portion (22), the connection of cutting member (1) and clamping part (2) is realized in connecting portion (12) and clamping part (21) cooperation, its characterized in that: the circumferential surface of the connecting part (12) comprises a plurality of positioning outer circumferential surfaces (121) and circumferential clearance surfaces (122) which are arranged at intervals, recessed bayonets (123) are formed in the positioning outer circumferential surfaces (121), axially extending closed positioning grooves (211), radially extending pin holes (212) and pins (3) arranged in the pin holes (212) are formed in the clamping part (21), when the cutting component (1) and the clamping component (2) are assembled, the positioning outer circumferential surfaces (121) are axially inserted into the closed positioning grooves (211) through the clearance inner circumferential surfaces (2112), after the cutting component (1) rotates for a certain angle in the circumferential direction, the positioning outer circumferential surfaces (121) are in interference fit with the positioning inner circumferential surfaces (2111), and the positioning outer circumferential surfaces (121) and the positioning inner circumferential surfaces (2111) have variable interference in the circumferential rotation process of the cutting component (1), the front end of the pin (3) is matched with the concave bayonet (123).

2. The split drilling machining tool of claim 1, characterized in that: when the cutting component (1) and the clamping component (2) are assembled in place, the outer diameter of the positioning outer peripheral surface (121) is d1, and the hole diameter of the positioning inner peripheral surface (2111) is d2 on any radial section, so that the following requirements are met: d1-d2 is more than or equal to 0 and less than or equal to 0.03 mm.

3. The split drilling machining tool of claim 1, characterized in that: after the positioning outer peripheral surface (121) is axially inserted into the closed positioning groove (211) through the clearance inner peripheral surface (2112) and the cutting component (1) rotates by a circumferential angle C, the positioning outer peripheral surface (121) and the positioning inner peripheral surface (2111) are in interference fit, and the requirements are met: c is more than or equal to 60 degrees and less than or equal to 100 degrees.

4. The split drilling machining tool of any one of claims 1 to 3, characterized in that: the positioning inner circumferential surface (2111) and the clearance inner circumferential surface (2112) are arranged at intervals symmetrically, the positioning outer circumferential surface (121) and the circumferential clearance surface (122) are also arranged at intervals symmetrically, and the number M of the positioning outer circumferential surfaces (121), the number N of the circumferential clearance surfaces (122), the number P of the positioning inner circumferential surface (2111) and the number Q of the clearance inner circumferential surface (2112) are satisfied: 2 ≦ M ≦ N ═ P ≦ Q ≦ 4.

5. The split drilling machining tool of any one of claims 1 to 3, characterized in that: the pin (3) is installed in the pin hole (212) in advance, when the positioning outer peripheral surface (121) is inserted into the closed positioning groove (211) through the clearance inner peripheral surface (2112), a gap T3 exists between the circumferential clearance surface (122) and the end part of the pin (3), and the requirements are met: t3 is more than or equal to 0.05mm and less than or equal to 0.2 mm.

6. The split drilling machining tool of any one of claims 1 to 3, characterized in that: two torque transmission surfaces (14) are arranged on the cutting portion (11), two circumferential surfaces (214) corresponding to the two torque transmission surfaces (14) are arranged on the clamping portion (21), and when the cutting component (1) and the clamping component (2) are assembled in place, a gap T4 between the torque transmission surfaces (14) and the circumferential surfaces (214) is equal to 0.

7. The split drilling machining tool of any one of claims 1 to 3, characterized in that: cutting portion (11) and connecting portion (12) juncture are equipped with axial positioning face (111), be equipped with axial face (213) that correspond with axial positioning face (111) on clamping part (21), when cutting part (1) and clamping part (2) assemble in place, the clearance between axial positioning face (111) and axial face (213) is T2, the axial length of connecting portion (12) is L2, the axial depth of sealing constant head tank (211) is L3, should satisfy: t2 is 0, L3-L2 is 0.05mm ≤ 1.0 mm.

8. The split drilling machining tool of claim 2, characterized in that: be equipped with two chip pockets (13) on cutting portion (11), be equipped with on clamping part (21) with chip pocket (13) correspond and to shank (22) the helical groove (25) that extend.

9. The split drilling machining tool of claim 8, characterized in that: the diameter of the outer peripheral surface of the cutting part (11) is D, the minimum thickness between the two chip grooves (13) is L1, and the following requirements are met: d1 is more than or equal to 0.15D and less than or equal to 0.32D, and L1-D1 is more than or equal to 1mm and less than or equal to 3.0 mm.

10. The split drilling machining tool of any one of claims 1 to 3, characterized in that: the top of sealing the locating slot (211) is provided with an inner chamfer (2113), the connecting part (12) is provided with an outer chamfer (124), and the inner chamfer (2113) and the outer chamfer (124) can be used for realizing pre-centering.