Cutting tool

Abstract

The utility model provides a cutting tool which comprises a tool apron provided with a bottom wall and an inclined wall which form an included angle beta, and at least part of the bottom wall and the inclined wall define a clamping cavity; the cutting blade is provided with a wedge-shaped part extending outwards, and the wedge-shaped part is provided with at least one part of blade lower surface and a first positioning inclined surface; wherein the wedge-shaped part is embedded into the clamping cavity, at least parts of the lower surface of the blade and the first positioning inclined surface of the wedge-shaped part abut against the bottom wall and the inclined wall respectively, so that the cutting blade is fixed at least in part of directions, and beta is larger than or equal to 45 degrees and smaller than or equal to 65 degrees. The utility model aims to solve the problems of cutter vibration, unstable clamping and the like when the conventional cutting tool is used for cutting a workpiece.

Description

Technical Field

[0001] This utility model belongs to the field of machining, and in particular relates to a cutting tool. Background Technology

[0002] In the field of machining, cutting tools play a crucial role, widely used to shape various workpieces, forming desired grooves and shapes. This widespread application stems primarily from the machining industry's continuous pursuit of high-precision and high-efficiency machining technologies. For cutting tools, especially those specifically designed for machining grooves, the stability of their positioning structure directly affects the quality of the machined workpiece surface. In the context of pursuing machining efficiency to improve cost-effectiveness and market competitiveness, the positioning and clamping technology of cutting tools is particularly important.

[0003] However, common cutting tools on the market, especially those used for machining small parts, often experience vibration during actual operation. This not only affects the surface finish of the workpiece but may also lead to a decrease in workpiece quality. Furthermore, traditional cutting tool positioning and clamping methods are insufficient in both positioning accuracy and clamping efficiency. These problems not only reduce the stability of the cutting tool during machining, increasing the risk of scratching the workpiece surface, but also shorten the tool's lifespan, thus affecting overall machining efficiency. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to solve the problems of vibration and unstable clamping that occur when existing cutting tools cut workpieces.

[0005] This application provides a cutting tool, including:

[0006] The tool holder has a bottom wall and an inclined wall at an angle β, and at least part of the bottom wall and the inclined wall defines a clamping cavity;

[0007] A cutting insert having an outwardly extending wedge-shaped portion, the wedge-shaped portion having at least a portion of the insert's lower surface and a first positioning bevel;

[0008] The wedge-shaped part is embedded in the clamping cavity, and its lower surface of the blade and the first positioning inclined surface at least partially abut against the bottom wall and the inclined wall, respectively, to fix the cutting blade in at least a partial direction, and 45°≤β≤65°.

[0009] Furthermore, it also includes a pressure block for pressing the cutting blade onto the tool holder; the pressure block has a first pressing surface, the cutting blade also has a second positioning inclined surface, and the tool holder also has a side wall; the first pressing surface is at least partially pressed against the second positioning inclined surface, the second positioning inclined surface is set at an acute angle to the bottom wall and the side wall respectively, and the angle γ between the second positioning inclined surface and the bottom wall is 18° to 51°.

[0010] Furthermore, it also includes a pressure block, a locking member, and a cutting head. The cutting head has the cutting head and a locking hole. The pressure block has a through hole communicating with the locking hole. The locking member presses the pressure block and the cutting blade onto the cutting head through the through hole and the locking hole. The axial center line of the locking member is parallel to and not collinear with the axial center line of the locking hole.

[0011] Furthermore, the axial center line of the locking member and the axial center line of the locking hole have a distance D3, and 0.15mm≦D3≦0.3mm.

[0012] Furthermore, it also includes a cutting head, which has an upper end face and a cutting holder formed by a recess on the opposite upper end face. The cutting insert mounted on the cutting holder has an upper surface that is higher than the upper end face, and its clearance value D1 is 0.23 mm to 1.23 mm.

[0013] Furthermore, it also includes a pressure block for pressing the cutting blade onto the tool holder. The pressure block has a bottom surface of a pressure block plate, and there is a gap value D2 between the bottom surface of the pressure block plate and the upper surface, where 0.35 ≤ D2 ≤ 1.35 mm and D2 > D1.

[0014] Specifically, D2-D1≧0.12mm.

[0015] Furthermore, it also includes a cutting head and a pressure block for pressing the cutting blade onto the tool holder; the pressure block includes a pressure block plate and a positioning protrusion extending downward from one end of the pressure block plate; the cutting head has an upper end face, and the upper end face is provided with a positioning groove that cooperates with the positioning protrusion, and the positioning protrusion is at least partially embedded in the positioning groove to fix the pressure block in at least a portion of the direction.

[0016] The improvements in this application bring the following advantages: The clamping method of the cutting tool provided in this application embodiment can reduce the risk of unstable clamping in existing systems, thereby achieving a more stable assembly effect. Furthermore, this positioning structure has sufficient rigidity and stability to resist the effects of cutting forces and vibrations that occur in the machining of small parts. It reduces the risk of machining instability, such as oscillation, that is prone to occur in existing systems. Attached Figure Description

[0017] Figure 1 This is an exploded view of a cutting tool according to an embodiment of this application;

[0018] Figure 2 This is a three-dimensional structural diagram of the blade body of this application;

[0019] Figure 3 This is a side view of the blade body of this application;

[0020] Figure 4 This is a side view of a cutting tool according to an embodiment of this application;

[0021] Figure 5 For along Figure 4 Cross-sectional view of AA in the middle;

[0022] Figure 6 This is a three-dimensional structural diagram of the cutting blade of this application;

[0023] Figure 7 This is another three-dimensional structural diagram of the cutting blade of this application;

[0024] Figure 8 This is a schematic diagram of the side structure of the cutting insert of this application;

[0025] Figure 9 For along Figure 8 Cross-sectional view of PP in China;

[0026] Figure 10 This is a three-dimensional structural diagram of the pressing block in this application;

[0027] Figure 11 This is a schematic diagram of the side structure of the pressure block in this application;

[0028] Figure 12 This is a schematic diagram of the other side structure of the pressure block in this application;

[0029] Figure 13 For along Figure 12 Cross-sectional view of BB in the middle;

[0030] Figure 14 For along Figure 12 Cross-sectional view of CC. Detailed Implementation

[0031] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0032] Please see Figure 1-14 This application provides an embodiment of a cutting tool, comprising:

[0033] The tool holder 13 has a bottom wall 131 and an inclined wall 132 forming an included angle β, and at least a portion of the bottom wall 131 and the inclined wall 132 defines a clamping cavity 14.

[0034] The cutting blade 2 has an outwardly extending wedge-shaped portion 24, the wedge-shaped portion 24 having at least a portion of the blade's lower surface 22 and a first positioning bevel 241;

[0035] The wedge-shaped portion 24 is embedded in the clamping cavity 14, and its lower surface 22 and the first positioning inclined surface 241 abut against the bottom wall 131 and the inclined wall 132, respectively, to fix the cutting blade 2 in certain directions, such as reducing or even preventing the blade from moving or vibrating in the directions of the bottom wall 131, the inclined wall 132, and the side wall 133. The included angle β is an acute angle, preferably 45°, 50°, 55°, 60°, 65°, etc. Compared with general vertical plane positioning, this angle setting not only facilitates the stability of the cutting blade installation, but also has an angle range between 45° and 65°. When the angle is less than 45°, the strength of the cutting blade will decrease, resulting in poor practical application effect and short tool life. When the angle is greater than 65°, the clamping stability decreases accordingly, which will still lead to a decrease in the stability of the cutting blade during assembly. Moreover, beyond this range, it is not conducive to the shape structure design and machining of the cutting blade. More specifically, the angle design of the bottom wall and the inclined wall of the tool holder has a more stable positioning effect when applied to workpiece machining.

[0036] Specifically, the lower surface 22 of the blade and the first positioning inclined surface 241 form an angle θ, where θ = β or θ ≈ β.

[0037] Unless otherwise specified, all cutting tools described in this application are in a fully installed state.

[0038] As one embodiment, a cutting tool includes: a tool body 1 having a tool holder 13, a cutting blade 2, a pressure block 3 for pressing and fixing the cutting blade 2 to the tool holder 13, and a locking member 4 for locking and fixing the tool body 1, the cutting blade 2 and the pressure block 3 into one unit.

[0039] As one embodiment, the cutting blade 2 includes a blade body 25 and a wedge-shaped portion 24. The blade body 25 has an upper blade surface 21, a lower blade surface 22, and a blade side surface 23 connecting the upper blade surface 21 and the lower blade surface 22. The wedge-shaped portion 24 extends outward from the blade side surface 23. The upper blade surface 21 is partially recessed and inclined downward to form a second positioning slope 211 and a positioning sidewall 212. The lower end of the wedge-shaped portion has a portion of the lower blade surface 22, or in other words, the lower end surface of the wedge-shaped portion 24 is connected to the lower blade surface 22; the upper end of the wedge-shaped portion 24 has a first positioning slope 241.

[0040] The cutter body 1 includes a cutter shank 11 and a cutter head 12 disposed at one end of the cutter shank 11. The cutter head 12 has an upper end face 121, a front end face 122, and a first cutter head side face 123. A tool holder 13 for mounting the cutting insert 2 is recessed at the intersection of the upper end face 121, the front end face 122, and the first cutter head side face 123. The tool holder 13 has a bottom wall 131, an inclined wall 132, and a side wall 133. The bottom wall 131 abuts against the lower surface 22 of the insert, the inclined wall 132 abuts against the first positioning inclined surface 241, and the side wall 133 abuts against the first side face 231 of the insert side face 23. The bottom wall and the inclined wall of the tool holder form an angle β and clamp and define a clamping cavity.

[0041] As an example, near the intersection of the bottom wall and the inclined wall, both the bottom wall and the inclined wall are slightly recessed to form a clearance area, and the clamping cavity of the clearance area is connected.

[0042] As an example, such as Figure 10-14 As shown, the bottom end of the clamping claw 311 has a first gripping surface 311a that abuts against the second positioning inclined surface 211 of the cutting blade 2; the first gripping surface 311a has an angle α1 with the bottom surface 34 of the pressure plate, wherein 18°≦α1≦51°.

[0043] As an example, such as Figure 10-14 As shown, the side of the clamping claw 311 has a second gripping surface 311b that abuts against the positioning sidewall 212 of the cutting blade 2; the second gripping surface 311b has an angle α2 with the bottom surface 34 of the pressure plate, wherein α2≦90°.

[0044] As one embodiment, the pressure block 3 includes a pressure plate 35 and pressure claw portions 311 and positioning protrusions 32 extending downward from opposite ends of the pressure plate 35. The pressure claw portions 311 apply pressure to the second positioning inclined surface 211 and positioning sidewall 212 of the cutting blade 2 to maintain the positioning of the cutting blade 2, and the pressure block 3 is fixedly connected to the tool holder 13 by a locking member 4. The first gripping surface 311a of the pressure claw portion 311 abuts against the second positioning inclined surface 211 of the cutting blade 2, and the second gripping surface 311b of the pressure claw portion 311 abuts against the positioning sidewall 212 of the cutting blade 2.

[0045] As one embodiment, the cutting blade 2 has two wedge-shaped portions 24, which are formed by extending outward from two opposite blade sides 23 of the blade body.

[0046] As an example, the lower surface 22 of the blade is also partially recessed and inclined to form a second positioning slope 211.

[0047] As an example, the upper end face 121 of the cutter head 12 is provided with a positioning groove 1211 corresponding to the positioning protrusion 32. The positioning protrusion 32 is partially or completely embedded in the positioning groove 1211, which can help the pressure block 3 to better and more stably and firmly press and lock the cutting blade 2, reducing the displacement and vibration of the cutting blade 2 during the processing.

[0048] As one embodiment, the first gripping surface 311a of the pressure block 3 is at least partially pressed against the second positioning inclined surface 211 of the cutting blade. The second positioning inclined surface 211 of the cutting blade is set at an acute angle γ with the bottom wall 131 and the side wall 133, respectively. The angle value range of the included angle γ is preferably 23°, 28°, 33°, 38°, 43°, 48°, etc. Compared with ordinary cutting blades, this cutting blade 2 has a special positioning surface system, in which the locking member 4 acts on the pressure block 3, and then the main pressure is transmitted vertically downward to the cutting blade 2 itself through the second positioning inclined surface 211 within a certain angle range, and finally acts on the blade body 1. Specifically, apart from non-essential factors such as gravity, the pressure applied by the locking element 4 to the pressure block 3 causes the second positioning inclined surface 211 of the cutting blade, which bears its clamping force, to be subjected to both a downward pressure component and a pressure component applied towards the inner side wall. This results in better clamping stability of the inclined positioning surface of the cutting blade 2, forming a stable fastening effect. This positioning structure facilitates the transmission of the fastening force of the locking element 4 to the cutting blade 2.

[0049] Preferably, the included angle γ is equal to or approximately equal to the included angle α1.

[0050] Furthermore, the angle between the positioning surface 311a on the side of the pressure block 3 and the first positioning inclined surface 241 is in a corresponding relationship.

[0051] As an example, the pressure block 3 is also provided with a through hole 33 penetrating the middle of the pressure block plate 35, and a locking hole 1212 corresponding to the through hole 33 is provided on the upper end face 121 of the cutter head 12. The locking member 4 can be inserted into and accommodated in the through hole 33 and the locking hole 1212, thereby tightly and reliably locking the pressure block, the cutting blade and the cutter body into one piece.

[0052] As an example, the axial center line L1 of the locking member 4 is parallel to and not collinear with the axial center line L2 of the locking hole 1212. Specifically, there is a distance D3 between the axial center line L1 of the locking member 4 and the axial center line L2 of the locking hole 1212. Preferably, D3 is 0.15mm, 0.2mm, 0.25mm, 0.3mm, etc. The locking member 4, the pressure block 3, and the blade body are connected in a staggered manner. The center of the locking member through hole of the blade body is misaligned with the center of the locking member 4. Unlike concentric vertical downward assembly, the misalignment distance D3 is between 0.15mm and 0.3mm. The misalignment between the locking element 4 and the center of the locking hole of the tool body generates a greater clamping force when the locking element 4 is tightened. This clamping force acts on the pressure block 3, thereby indirectly fixing the cutting blade 2 to the tool body better. Moreover, the misaligned connection between the three has a better locking effect than the general tightening method of the locking element 4 being screwed into the locking hole.

[0053] In one embodiment, the cutting insert 2 is assembled in the tool holder 13 of the tool head 12. The upper surface 21 of the insert is higher than the upper end face 121 of the tool head, and the clearance value D1 of the insert is preferably 0.23mm, 0.43mm, 0.63mm, 0.83mm, 1.03mm, 1.23mm, etc. By designing the upper surface 21 of the insert to be higher than the upper end face 121, an assembly effect of avoiding gaps and protecting the surface of the cutting insert 2 from compression and wear is achieved.

[0054] As an example, there is a gap value D2 between the bottom surface 34 of the pressure plate and the upper end surface 121; the difference between D2 and D1 is the gap value from the bottom surface 34 of the pressure plate to the upper surface of the blade. There is a certain gap between the upper surface 21 of the blade and the bottom surface 34 of the pressure plate, preferably 0.12mm, 0.14mm, 0.16mm, etc. Furthermore, the gap value D2 is preferably 0.35mm, 0.55mm, 0.75mm, 1.05mm, 1.35mm, etc. By designing gaps between the upper surface 21 of the cutting blade and the bottom surface 34 of the pressure plate, and between the upper surface 21 of the cutting blade and the upper end surface 121 of the blade head, the effect of preventing interference between the three components during assembly and use can be achieved.

[0055] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A cutting tool, characterized in that, include: The tool holder has a bottom wall and an inclined wall at an angle β, and at least part of the bottom wall and the inclined wall defines a clamping cavity; A cutting insert having an outwardly extending wedge-shaped portion, the wedge-shaped portion having at least a portion of the insert's lower surface and a first positioning bevel; The wedge-shaped portion is embedded in the clamping cavity, and its lower surface of the blade and the first positioning inclined surface at least partially abut against the bottom wall and the inclined wall, respectively, to fix the cutting blade in at least a portion of the direction, and 45°≤β≤65°.

2. A cutting tool according to claim 1, characterized in that, It also includes a pressure block for pressing the cutting blade onto the tool holder; the pressure block has a first pressing surface, the cutting blade also has a second positioning inclined surface, and the tool holder also has a side wall; the first pressing surface is at least partially pressed against the second positioning inclined surface, the second positioning inclined surface is set at an acute angle to the bottom wall and the side wall respectively, and the angle γ between the second positioning inclined surface and the bottom wall is 18° to 51°.

3. A cutting tool according to claim 1, characterized in that, It also includes a pressure block, a locking member, and a cutting head. The cutting head has the cutting head and a locking hole. The pressure block has a through hole communicating with the locking hole. The locking member presses the pressure block and the cutting blade onto the cutting head through the through hole and the locking hole. The axial center line of the locking member is parallel to and not collinear with the axial center line of the locking hole.

4. A cutting tool according to claim 3, characterized in that, The axial centerline of the locking member and the axial centerline of the locking hole have a distance D3, and 0.15mm≦D3≦0.3mm.

5. A cutting tool according to any one of claims 1-4, characterized in that, It also includes a cutting head, which has an upper end face and a cutting holder formed by a recess on the opposite upper end face. The cutting insert mounted on the cutting holder has an upper surface that is higher than the upper end face, and its clearance value D1 is 0.23 mm to 1.23 mm.

6. A cutting tool according to claim 5, characterized in that, It also includes a pressure block for pressing the cutting blade onto the tool holder. The pressure block has a bottom surface of a pressure block plate, and there is a gap value D2 between the bottom surface of the pressure block plate and the top surface, where 0.35 ≤ D2 ≤ 1.35 mm and D2 > D1.

7. A cutting tool according to claim 6, characterized in that, D2-D1≧0.12mm.

8. A cutting tool according to any one of claims 1-4, characterized in that, It also includes a cutting head and a pressure block for pressing the cutting blade onto the tool holder; the pressure block includes a pressure block plate and a positioning protrusion extending downward from one end of the pressure block plate; the cutting head has an upper end face, and the upper end face is provided with a positioning groove that mates with the positioning protrusion, and the positioning protrusion is at least partially embedded in the positioning groove to fix the pressure block in at least a portion of the direction.

9. The cutting tool according to claim 3, characterized in that, The pressure block includes a pressure plate and pressing claws and positioning protrusions extending downward from opposite ends of the pressure plate.

10. The cutting tool according to claim 9, characterized in that, The clamping claw has a first clamping surface and a second clamping surface. The first clamping surface and the second clamping surface form two included angles α1 and α2 with the bottom surface of the pressure plate, respectively, where 18°≦α1≦51° and α2≦90°.

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