CN116900368A - A split drilling tool - Google Patents

Abstract

The invention discloses a split drilling tool, which comprises a cutting part and a clamping part, wherein the cutting part comprises a cutting part and a connecting boss, the clamping part comprises a handle part and a clamping groove, the connecting boss is matched with the clamping groove to realize the connection of the cutting part and the clamping part, the outer circumferential surface of the connecting boss comprises a large circumferential surface and a small circumferential surface which are circumferentially arranged, the large circumferential surface and the small circumferential surface have the same rotation center shaft, the rotation radius of the large circumferential surface is larger than that of the small circumferential surface, and the inner wall of the clamping groove comprises an inner large circumferential surface matched with the large circumferential surface and an inner small circumferential surface matched with the small circumferential surface.

Description

A split drilling tool

Technical field

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

Background technique

In drilling processing, in order to extend the service life of the cutting part, more expensive carbide or similar materials are usually used as tool materials. Since such materials have the characteristics of high hardness and good wear resistance, they are extremely difficult to process, which makes The material cost and processing cost of drilling tools are high.

In order to solve the above problems, drilling tools in the prior art generally adopt a split structure, that is, they are assembled from cutting parts and clamping parts. The cutting parts are made of cemented carbide or similar materials with high hardness and strong wear resistance. The clamping part is made of a material with greater elasticity. When the cutting part is worn, the cutting part can be replaced separately, thereby reducing the cost of drilling. However, this type of tool generally adopts a two-piece clamping structure, using the elastic deformation of the clamping mechanism to open a tiny included angle to achieve clamping and positioning. The positioning strength is not high, the cutting parts are easy to fall off, and the life of the clamping parts is short. .

Chinese patent document CN113953564A discloses a split drilling tool. When the cutting component and the clamping component are assembled, the positioning outer peripheral surface is axially inserted into the closed positioning groove through the hollow inner peripheral surface, and the cutting component is circumferentially rotated at a certain angle. , the positioning outer circumferential surface and the positioning inner circumferential surface have an interference fit, and the positioning outer circumferential surface and the positioning inner circumferential surface have a varying amount of interference during the circumferential rotation of the cutting component. Although the two-piece elastic structure is easy to use during use, Deformation causes problems such as poor positioning accuracy and short life of the clamping parts. However, in this solution, the connection part has recessed bayonet openings in the circumferential direction and the connection part is rotationally symmetrical, resulting in low structural strength of the connection part, which is difficult to deal with when the feed is large, the torsion is large, etc. Under harsh working conditions, the connecting part is easy to break. On the other hand, this solution cannot limit the one-way assembly of cutting parts and connecting parts, and the assembly accuracy is poor.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology and provide a split drilling tool with high positioning accuracy, convenient assembly and disassembly, long service life and low production cost.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

A split drilling tool includes a cutting part and a clamping part. The cutting part includes a cutting part and a connecting boss. The clamping part includes a handle and a clamping groove. The connecting boss is connected to the connecting boss. The clamping groove cooperates to realize the connection between the cutting component and the clamping component. The outer circumferential surface of the connecting boss includes a large circumferential surface and a small circumferential surface arranged in the circumferential direction. The large circumferential surface and the small circumferential surface have the same rotation. central axis, the rotation radius of the large circumferential surface is greater than the rotation radius of the small circumferential surface, and the inner wall of the clamping groove includes an inner large circumferential surface that matches the large circumferential surface and an inner large circumferential surface that matches the small circumferential surface. Small inner surface.

As a further improvement of the above technical solution:

The rotation radius of the large circumferential surface is R2, and the rotation radius of the small circumferential surface is R1, which should satisfy: 0.6R2<R1<R2.

The rotation radius of the inner small peripheral surface is R3, which should satisfy: R3=R1.

The rotation radius of the inner large circumferential surface is R4, which should satisfy: 0<R4-R2<0.5mm.

On any cross section perpendicular to the central axis of rotation, the angle formed by the line connecting the two end points of the small circumferential surface and the central axis of rotation is A, and the angle formed by the line connecting the two end points of the inner small circumferential surface and the central axis of rotation is The angle is B, which should satisfy: 120°≤A≤180°, 120°≤B<180°, 0°≤A-B≤15°.

There is an outer connecting circumferential surface between the large circumferential surface and the small circumferential surface, the outer connecting circumferential surface is tangent to the small circumferential surface, and there is an inner connecting surface between the inner large circumferential surface and the inner small circumferential surface. The inner connecting peripheral surface is tangent to the inner small peripheral surface.

The angle formed by the intersection of the vertical bisecting plane P of the connecting boss through the central axis of rotation and the torque transmission surface of the cutting part is C, which should satisfy: 0°<C<30°.

The circumscribed radius of the cutting edge tip of the cutting part is R5, which should satisfy: 0.1R5<R1<0.3R5.

A pin hole is provided on the side wall of the clamping groove, a fastener is installed in the pin hole, and a recessed bayonet is provided on the large circumferential surface. When the cutting component and the clamping component are assembled in place, the The end of the fastener cooperates with the recessed bayonet to lock the cutting component and the clamping component.

The recessed bayonet includes an upper side of the bayonet, a bottom surface of the bayonet and a lower side of the bayonet. When the cutting component and the clamping component are assembled in place, the fastener is in contact with the upper side of the bayonet, the bottom surface of the bayonet and the lower surface of the bayonet. The gaps on the lower side of the bayonet are t1, t2 and t3 respectively, which should satisfy: 0<t1<0.5mm, t2=t3=0.

Compared with the prior art, the advantages of the present invention are:

The split drilling tool of the present invention includes a cutting part and a clamping part. The cutting part includes a cutting part and a connecting boss. The clamping part includes a handle and a clamping groove. The connecting boss and the clamping groove cooperate to form the cutting part. In connection with the clamping component, the outer circumferential surface of the connecting boss includes a large circumferential surface and a small circumferential surface arranged in the circumferential direction. The large circumferential surface and the small circumferential surface have the same central axis of rotation, and the rotation radius of the large circumferential surface is larger than that of the small circumferential surface. The rotation radius of the clamping groove includes an inner large circumferential surface that matches the large circumferential surface and an inner small circumferential surface that matches the small circumferential surface. Through the small circumferential surface and the inner small circumferential surface, the large circumferential surface and the inner large circumferential surface The combination realizes the circumferential and radial positioning of the cutting parts and the clamping parts, and the small circumferential surface and the inner small circumferential surface, and the large circumferential surface and the inner large circumferential surface can achieve semicircular positioning close to 180°, and the contact area of the positioning surface is large. There is no positioning weak area, thus improving the positioning strength and accuracy, allowing the tool to still cut stably under working conditions such as large feed and high torque, which greatly improves the versatility and service life of the tool.

Description of the drawings

Figure 1 is a three-dimensional structural view of the split drilling tool of the present invention.

Figure 2 is a three-dimensional structural view of the cutting component of the split drilling tool of the present invention.

Figure 3 is a three-dimensional structural view of the clamping component of the split drilling tool of the present invention.

Figure 4 is a front view of the split drilling tool of the present invention.

FIG. 5 is view A-A of FIG. 4 .

Figure 6 is an enlarged view of B in Figure 5.

Figure 7 is a side view of the split drilling tool of the present invention.

FIG. 8 is view C-C of FIG. 4 .

FIG. 9 is an enlarged view of D in FIG. 8 .

Each symbol in the figure represents:

1. Cutting parts; 11. Cutting part; 111. Torque transmission surface; 12. Connection boss; 121. Small circumferential surface; 122. Large circumferential surface; 123. External connecting circumferential surface; 124. Recessed bayonet; 1241. Upper side of the bayonet; 1242. Bottom surface of the bayonet; 1243. Lower side of the bayonet; 2. Clamping component; 21. Handle; 22. Clamping groove; 221. Inner small peripheral surface; 222. Inner large peripheral surface; 223 , Internal connecting surface; 23. Pin hole; 24. Chip groove; 3. Fasteners; 4. Rotating central axis.

Detailed ways

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

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "horizontal", "inner", "outer", "top", "bottom", etc. indicate the orientation or positional relationship as The orientation or positional relationship shown in the drawings is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood. are limitations of the present invention.

Figures 1 to 9 show an embodiment of the split drilling tool of the present invention. The split drilling tool includes a cutting part 1 and a clamping part 2. The cutting part 1 includes a cutting part 11 and a connecting boss. 12. The clamping part 2 includes a handle 21 and a clamping groove 22. The connecting boss 12 cooperates with the clamping groove 22 to realize the connection between the cutting part 1 and the clamping part 2. The outer peripheral surface of the connecting boss 12 includes circumferentially arranged The large circumferential surface 122 and the small circumferential surface 121 have the same rotation center axis 4. The rotation radius of the large circumferential surface 122 is greater than the rotation radius of the small circumferential surface 121. The inner wall of the clamping groove 22 includes The inner large circumferential surface 222 matching the large circumferential surface 122 and the inner small circumferential surface 221 matching the small circumferential surface 121 are realized by the small circumferential surface 121 and the inner small circumferential surface 221, and the large circumferential surface 122 and the inner large circumferential surface 222. The cutting part 1 and the clamping part 2 are positioned in the circumferential and radial directions, and the small circumferential surface 121 and the inner small circumferential surface 221, and the large circumferential surface 122 and the inner large circumferential surface 222 can all achieve semicircular positioning close to 180°. The positioning surface The contact area is large and there is no positioning weak area, thus improving the positioning strength and accuracy, allowing the tool to still cut stably under working conditions such as large feed and high torque, greatly improving the versatility and service life of the tool, small circle The surface 121, the inner small circumferential surface 221, the large circumferential surface 122 and the inner large circumferential surface 222 are all arc surfaces, and the large circumferential surface 122 and the small circumferential surface 121 have the same rotation center axis 4, which reduces the connection boss 12 and The processing difficulty of the clamping groove 22 reduces the tool manufacturing cost.

The rotation radius of the large circumferential surface 122 is R2, and the rotation radius of the small circumferential surface 121 is R1. In order to ensure the positioning area of the connecting boss 12 and increase the cross-sectional area of the connecting boss 12, it should satisfy: 0.6R2<R1<R2, In this embodiment, R1=1.4mm and R2=1.6mm.

In this embodiment, the rotation radius of the inner small peripheral surface 221 is R3. To ensure the matching accuracy between the connecting boss 12 and the clamping groove 22, it should satisfy: R3=R1. In this embodiment, R3=1.4mm.

The rotation radius of the inner large peripheral surface 222 is R4. In order to facilitate the loading and unloading of the cutting component 1 and the clamping component 2, it should satisfy: 0<R4-R2<0.5mm. In this embodiment, R4=1.7mm.

In this embodiment, on any cross section perpendicular to the rotation central axis 4, the angle formed by the connection between the two end points of the small circumferential surface 121 and the rotation central axis 4 is A, and the two end points of the inner small circumferential surface 221 and the rotation central axis The angle formed by the 4 lines is B. In order to ensure that the connecting boss 12 and the clamping groove 22 have sufficient positioning arcs and ensure positioning accuracy, it should meet: 120°≤A≤180°, 120°≤B<180°, 0°≤A-B≤15°. In this embodiment, A=175° and B=170°.

In this embodiment, an outer connecting circumferential surface 123 is provided between the large circumferential surface 122 and the small circumferential surface 121 . The outer connecting circumferential surface 123 is tangent to the small circumferential surface 121 . There is an inner connecting peripheral surface 223, which is tangent to the inner small peripheral surface 221, which reduces the processing difficulty of connecting the boss 12 and the clamping groove 22, and also avoids the generation of sharp points and reduces stress concentration. Improve tool life.

The angle C formed by the intersection of the vertical bisector plane P of the rotation center axis 4 and the torque transmission surface 111 of the cutting part 11 of the connecting boss 12 is C. The sufficient distance should satisfy: 0°<C<30°. In this embodiment, C=5°.

The circumscribed radius of the cutting edge tip of the cutting part 11 is R5, which should satisfy: 0.1R5<R1<0.3R5. In this embodiment, R5=9.5mm.

In this embodiment, a pin hole 23 is provided on the side wall of the clamping groove 22. A fastener 3 is installed in the pin hole 23. A recessed bayonet 124 is provided on the large circumferential surface 122. The cutting component 1 and the clamping component 2 When assembled in place, the end of the fastener 3 cooperates with the recessed bayonet 124 to lock the cutting component 1 and the clamping component 2 .

In this embodiment, the recessed bayonet 124 includes a bayonet upper side 1241, a bayonet bottom 1242, and a bayonet lower side 1243. When the cutting component 1 and the clamping component 2 are assembled in place, the fastener 3 and the bayonet upper side 1241 The gaps between the bottom surface of the bayonet 1242 and the lower side of the bayonet 1243 are t1, t2 and t3 respectively. In order to ensure that there is no gap between the axial force transmission surface of the cutting component 1 and the clamping component 2, it should satisfy: 0<t1<0.5mm , t2=t3=0, in this embodiment, t1=0.2mm.

Although the present invention has been disclosed above in terms of preferred embodiments, this is not intended to limit the present invention. Any person familiar with the art can, without departing from the scope of the technical solution of the present invention, use the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into equivalent implementations with equivalent changes. example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims (10)

1. The utility model provides a split type drilling processing cutter, includes cutting member (1) and clamping part (2), cutting member (1) is including cutting portion (11) and connection boss (12), clamping part (2) are including stalk portion (21) and centre gripping groove (22), connection boss (12) with centre gripping groove (22) cooperation realizes the connection of cutting member (1) and clamping part (2), its characterized in that: the outer peripheral surface of the connecting boss (12) comprises a large peripheral surface (122) and a small peripheral surface (121) which are circumferentially arranged, the large peripheral surface (122) and the small peripheral surface (121) have the same rotation center shaft (4), the rotation radius of the large peripheral surface (122) is larger than that of the small peripheral surface (121), and the inner wall of the clamping groove (22) comprises an inner large peripheral surface (222) matched with the large peripheral surface (122) and an inner small peripheral surface (221) matched with the small peripheral surface (121).

2. The split drilling machining tool of claim 1, wherein: the radius of rotation of the large circumferential surface (122) is R2, and the radius of rotation of the small circumferential surface (121) is R1, which should satisfy: 0.6R2< R1< R2.

3. The split drilling tool of claim 2, wherein: the rotation radius of the inner small peripheral surface (221) is R3, and the following conditions are satisfied: r3=r1.

4. A split drilling tool according to claim 3, wherein: the rotation radius of the inner peripheral surface (222) is R4, and the following is satisfied: 0< R4-R2<0.5mm.

5. The split drilling machining tool according to any one of claims 1 to 4, characterized in that: on any section perpendicular to the rotation center shaft (4), an included angle formed by connecting two end points of the small circumferential surface (121) with the rotation center shaft (4) is A, and an included angle formed by connecting two end points of the inner small circumferential surface (221) with the rotation center shaft (4) is B, so that the following conditions are satisfied: a is more than or equal to 120 degrees and less than or equal to 180 degrees, B is more than or equal to 120 degrees and less than or equal to 180 degrees, and A-B is more than or equal to 0 degrees and less than or equal to 15 degrees.

6. The split drilling machining tool according to any one of claims 1 to 4, characterized in that: an outer connection peripheral surface (123) is arranged between the large peripheral surface (122) and the small peripheral surface (121), the outer connection peripheral surface (123) is tangential to the small peripheral surface (121), an inner connection peripheral surface (223) is arranged between the inner large peripheral surface (222) and the inner small peripheral surface (221), and the inner connection peripheral surface (223) is tangential to the inner small peripheral surface (221).

7. The split drilling machining tool according to any one of claims 1 to 4, characterized in that: an included angle formed by the intersection of the connecting boss (12) passing through the perpendicular bisector plane P of the rotation center shaft (4) and the torque transmission surface (111) of the cutting part (11) is C, and the following conditions are satisfied: 0 ° < C <30 °.

8. The split drilling machining tool according to any one of claims 1 to 4, characterized in that: the radius of the circumcircle of the cutting tip of the cutting part (11) is R5, and the following conditions are satisfied: 0.1r5< r1<0.3r5.

9. The split drilling machining tool according to any one of claims 1 to 4, characterized in that: the clamping groove is characterized in that pin holes (23) are formed in the side wall of the clamping groove (22), a fastener (3) is arranged in the pin holes (23), a concave bayonet (124) is formed in the large circumferential surface (122), and when the cutting part (1) and the clamping part (2) are assembled in place, the end part of the fastener (3) is matched with the concave bayonet (124) to lock the cutting part (1) and the clamping part (2).

10. The split drilling tool of claim 9, wherein: the concave bayonet (124) comprises an upper bayonet side (1241), a bottom bayonet surface (1242) and a lower bayonet side (1243), and when the cutting part (1) and the clamping part (2) are assembled in place, the clearance between the fastener (3) and the upper bayonet side (1241), the bottom bayonet surface (1242) and the lower bayonet side (1243) is t1, t2 and t3 respectively, so that the following conditions are satisfied: 0< t1<0.5mm, t2=t3=0.