Turning blade

Abstract

The utility model provides a turning blade which comprises a blade body, the blade body is provided with an upper surface, a lower surface and a plurality of peripheral side faces connecting the upper surface and the lower surface, every two adjacent peripheral side faces are connected through a circular base curved surface, the two adjacent peripheral side faces and the circular base curved surface form a tool nose, and the upper surface is provided with a cutting edge and a chip breaker groove at the tool nose. The cutting edge and the chip breaker groove are symmetrical about the angular bisection surface of the tool nose; the cutting edge comprises an arc cutting edge and a rear side cutting edge, the chip breaker groove comprises a first chip breaker cambered surface and cutting surfaces symmetrically located on the two sides of the first chip breaker cambered surface, the arc cutting edge sinks towards the center of the blade body to form the first chip breaker cambered surface, and the first chip breaker cambered surface and the circular base curved surface intersect to form the arc cutting edge; the cutting face and the peripheral side face intersect to form a rear side cutting edge. Through the combined action of the first chip breaking cambered surface and the symmetrical cutting surfaces, chips are guided to continuously curl and move and are broken and discharged at a proper position, so that the chips are prevented from being accumulated, and the risks of tool abrasion and chip winding are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of machining tools, in particular to a turning blade. Background Art

[0002] In the field of metal cutting machining, the performance of the blade directly affects chip control and chip evacuation efficiency during the machining process. Chip control refers to the effective management of chip formation, curling, and fracture during cutting to avoid chip entanglement with the workpiece or tool, and to maintain machining stability and safety. Good chip control can improve machining efficiency, reduce tool wear, and maintain the continuity and stability of the machining process. Therefore, one of the important objectives of blade design is to achieve smooth chip evacuation and effective fracture.

[0003] In traditional blade design, chip control mainly relies on the chip breaker groove structure on the blade. The geometric shape and size of these chip breaker grooves directly affect chip curling and fracture behavior. However, the common chip breaker groove designs in the prior art often rely on a single form and are difficult to adapt to the chip control requirements under different machining conditions. For example, at different cutting depths and feed rates, a single chip breaker groove structure may not be able to effectively control chip formation and fracture, resulting in unsmooth chip evacuation, increased friction and heat generation during machining, and affecting machining efficiency and tool life.

[0004] In addition, the chip breaker groove design of traditional blades is usually formed by die pressing or sintering. This method has limitations in achieving high-precision geometric shapes and microstructures. The chip breaker grooves formed by die pressing or sintering may show inconsistencies during chip flow and fracture processes, further affecting the chip control effect. Especially during high-speed cutting or machining of difficult-to-cut materials, the deficiencies of the existing chip breaker groove designs are more obvious, easily leading to chip entanglement and tool damage, and reducing machining stability. Summary of the Utility Model

[0005] In view of this, the utility model provides a turning blade, which optimizes the chip breaker groove structure on the blade to achieve effective fracture and smooth evacuation of chips, thereby improving the stability and efficiency of the machining process, reducing the risk of tool wear and chip entanglement. At the same time, the utility model also adopts a new chip breaker groove manufacturing process to ensure the precision and accuracy of the chip breaker groove and the consistency of mass production, reduce the generation of defective products during the blade production process, and improve the quality of the blade.

[0006] The technical solution of the utility model is realized as follows:

[0007] The utility model provides a turning tool blade, which comprises a blade body. The blade body is of a polygonal structure and is provided with a central hole. The blade body is rotationally symmetric about the central axis of the central hole. The blade body includes an upper surface, a lower surface and a plurality of peripheral side surfaces connecting the upper surface and the lower surface. Adjacent two peripheral side surfaces are connected by a circular base curved surface, and the three form a tool tip. The upper surface has a cutting edge and a chip breaker groove at the tool tip, and the cutting edge and the chip breaker groove are symmetric about the angular bisecting plane of the tool tip.

[0008] The cutting edge includes an arc cutting edge and two rear cutting edges located on both sides of the arc cutting edge, and the arc cutting edge intersects with the angular bisecting plane of the tool tip.

[0009] The chip breaker groove includes a first chip breaking arc surface and cutting surfaces symmetrically located on both sides of the first chip breaking arc surface. The first chip breaking arc surface is recessed from the arc cutting edge towards the central hole, and the first chip breaking arc surface intersects with the circular base curved surface to form the arc cutting edge. The two cutting surfaces respectively intersect with the adjacent peripheral side surfaces to form the rear cutting edges.

[0010] On the basis of the above technical solution, preferably, the chip breaker groove further includes an arc cutting edge surface, which is located between the first chip breaking arc surface and the circular base curved surface. The arc cutting edge surface intersects with the circular base curved surface to form the arc cutting edge, the arc cutting edge surface intersects with the first chip breaking arc surface to form a front chip discharging edge, the arc cutting edge surface respectively intersects with the two peripheral side surfaces to form front cutting edges, and the arc cutting edge surface is respectively tangent to the two cutting surfaces.

[0011] On the basis of the above technical solution, preferably, the chip breaker groove further includes two second chip breaking arc surfaces, which are symmetrically located on both sides of the first chip breaking arc surface and are located between the cutting surface and the first chip breaking arc surface. The second chip breaking arc surface is tangent to the first chip breaking arc surface, and the cutting surface and the first chip breaking arc surface intersect to form a side chip discharging edge.

[0012] Furthermore, preferably, the vertex of the arc cutting edge is lower than the upper surface, and the distance from the upper surface to the vertex of the arc cutting edge is 0.01 mm to 0.5 mm.

[0013] Furthermore, preferably, the radius of the front chip discharging edge ranges from 0.1 mm to 3 mm, the radius of the arc cutting edge ranges from 0.03 mm to 3 mm, and the radius of the arc cutting edge is greater than the radius of the circular base curved surface.

[0014] Furthermore, preferably, the radius of the first chip breaking arc surface in its central longitudinal section ranges from 3 mm to 10 mm, the radius of the arc cutting edge surface in its central longitudinal section ranges from 5 mm to 15 mm, and the value of the radius of the arc cutting edge surface must be greater than the radius of the first chip breaking arc surface.

[0015] Based on the above technical solution, preferably, on the central longitudinal section of the first chip-breaking arc surface, the included angle a between the tangent line at the highest point of the circular arc cutting edge surface and the upper surface is 3° to 15°, and the included angle b between the tangent line at the highest point of the first chip-breaking arc surface and the upper surface is 5° to 25°.

[0016] Based on the above technical solution, preferably, on the central cross-section of the first chip-breaking arc surface, the included angle c between the contour tangent line of the cutting surface and the upper surface is 3° to 15°, and the included angle d between the contour tangent line of the second chip-breaking arc surface and the upper surface is 5° to 25°.

[0017] Preferably, the lower end of the circular base surface is inclined towards the central hole, and the included angle e between the circular base surface and the axis of the central hole is 3° to 15°.

[0018] Preferably, the chip-breaking groove is formed by a grinding process.

[0019] The utility model has the following beneficial effects compared with the prior art:

[0020] (1) Through the synergistic effect of the circular arc cutting edge and the rear cutting edge, a sharp cutting edge and a chip curling groove are formed. The chip can be cut smoothly and briskly during the initial formation and continuous cutting process, and the effectiveness of chip control is ensured. After the chip enters the chip-breaking groove, the first chip-breaking arc surface and the symmetric cutting surface act together to guide the continuous movement and curling of the chip. When the chip length reaches a certain extent, the geometric design of the chip-breaking groove causes it to break at an appropriate position. The broken chip is quickly discharged through the chip-breaking groove, preventing the chip from accumulating on the tool surface or the workpiece, reducing the risk of tool wear and chip entanglement, and improving the stability and efficiency of the machining process.

[0021] (2) The chip-breaking groove is made by grinding. The chip-breaking groove has excellent precision and can accurately control the chip flow direction. The chip-breaking groove made by grinding has excellent surface roughness, making the chip removal smoother, extending the tool life. At the same time, it is beneficial to machining workpieces with better surface roughness.

[0022] (3) The chip-breaking groove made by grinding is made by grinding with precision machining equipment, which can accurately control the 3D topography of the chip-breaking groove, improve the manufacturing precision of the chip-breaking groove, and reduce the defective rate during the blade production process.

[0023] (4) By setting the arc cutting edge surface, a transition area is formed between the first chip-breaking arc surface and the cylindrical surface of the cutting blade, optimizing the chip flow path, making the formation of the arc cutting edge smoother, thereby reducing the cutting resistance and the risk of the tool tip breaking. The arc cutting edge surface intersects with the first chip-breaking arc surface to form a front chip-breaking edge, ensuring a smooth chip flow direction and reducing the risk of chip accumulation and entanglement. At the same time, the arc cutting edge surface intersects with the front cutting edge, enabling the blade to maintain good cutting performance during multi-directional cutting, evenly distributing the cutting force, improving the smoothness of the cutting process and the smooth discharge of chips. Through this design, the chips are more smooth during the formation and curling process, improving the chip discharge efficiency and avoiding obvious obstacles during the chip flow and fracture process.

[0024] (5) The chip surface has a circular arc shape in both the axial and radial directions. This design of the chip-breaking groove enables the chips to curl and deform in two directions, forming more controlled chips, giving the blade good chip flow direction control ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 is a schematic plan view of the turning blade disclosed in the present invention;

[0027] Figure 2 is a schematic perspective view of a structure form of the turning blade disclosed in the present invention;

[0028] Figure 3 is a schematic perspective view of another structure form of the turning blade disclosed in the present invention;

[0029] Figure 4 is Figure 3 a partial enlarged view at C in

[0030] Figure 5 is Figure 1 a plan sectional view taken along the line A-A in

[0031] Figure 6 is Figure 1 a plan sectional view taken along the line B-B in

[0032] Figure 7 is a schematic view of the state of the turning blade disclosed in the present invention when machining a workpiece;

[0033] Reference numerals:

[0034] 1. Blade body; 10. Central hole; 11. Upper surface; 12. Lower surface; 13. Peripheral side surface; 14. Circular base surface; 2. Cutting edge; 3. Chip breaker groove; 21. Arc cutting edge; 22. Rear cutting edge; 31. First chip breaking arc surface; 32. Cutting surface; 34. Arc cutting edge surface; P1. Front chip discharging edge; 23. Front cutting edge; 33. Second chip breaking arc surface; P2. Side chip discharging edge; G. Workpiece. Specific embodiments

[0035] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] As Figure 1 shown, in combination with Figure 2 and 7 , an embodiment of the present invention discloses a turning blade, including a blade body 1. The blade body 1 is a polygonal structure. The blade body 1 is provided with a central hole 10, and the blade body 1 is rotationally symmetric about the central axis of the central hole 10.

[0037] Of course, as other embodiments, the blade body 1 can be a triangular structure or a quadrilateral structure. The blade body 1 is rotationally symmetric about the central axis of the central hole 10, so that the turning blade has good symmetry and stability during installation and use, which is convenient for blade positioning and replacement.

[0038] The blade body 1 includes an upper surface 11, a lower surface 12 and a plurality of peripheral side surfaces 13 connecting the upper surface 11 and the lower surface 12. Adjacent two peripheral side surfaces 13 are connected by a circular base surface 14 and the three form a tool tip. The upper surface 11 has a cutting edge 2 and a chip breaker groove 3 at the tool tip. The cutting edge and the chip breaker groove 3 are symmetric about the angular bisecting plane of the tool tip. This structural setting ensures the uniform formation and fracture of chips during the cutting process. In addition, all groove surfaces are processed by grinding technology to ensure low friction during processing. It helps to extend the processing life of the blade and form a machined surface with high quality and high roughness.

[0039] In this embodiment, the circular base surface 14 can be a cylindrical surface or a conical surface.

[0040] In this embodiment, the blade body 1 has a substantially rhombic structure. For convenience, one direction of the extension of the longer one of the two diagonals of the rhombus is set as the first direction Ax, and one direction of the extension of the shorter one of the diagonals is set as the second direction Ay. Among them, the cutting tip is in the Ax direction.

[0041] The cutting edge 2 includes an arc cutting edge 21 and two rear cutting edges 22 located on both sides of the arc cutting edge 21, and the arc cutting edge 21 intersects with the angular bisecting plane of the cutting tip.

[0042] In this embodiment, the arc cutting edge 21 is at the cutting tip part, so that the arc cutting edge 21 first contacts the material during the cutting process in the radial direction of the workpiece and starts the formation of the chip. Refer to the attached Figure 5 As shown, the radial rake angle structure of the arc cutting edge 21 can reduce the cutting resistance, make the initial formation of the chip smoother, contribute to the curling of the chip and guide the chip to flow towards the chip breaker groove 3.

[0043] Refer to the attached Figure 6 As shown, the rear cutting edges 22 are located on both sides of the cutting tip, extend from the arc cutting edge 21 and have an axial rake angle structure, so that the rear cutting edges 22 provide a sharp cutting edge during the axial cutting process of the workpiece, continuously reduce the cutting force, guide the chip to flow towards the chip breaker groove 3, and assist in the breaking of the chip.

[0044] The chip breaker groove 3 includes a first chip breaking arc surface 31 and cutting surfaces 32 symmetrically located on both sides of the first chip breaking arc surface 31. The first chip breaking arc surface 31 is recessed towards the center hole 10 direction from the arc cutting edge 21. The first chip breaking arc surface 31 intersects with the circular base curved surface 14 to form the arc cutting edge 21, and the two cutting surfaces 32 respectively intersect with the adjacent peripheral side surface 13 to form the rear cutting edges 22.

[0045] The first chip breaking arc surface 31 is set as a recessed structure, which can form a natural chip guiding path during the cutting process. The first chip breaking arc surface 31 helps the initial curling of the chip, and enables the chip to be smoothly guided into the chip breaker groove 3 after formation, reduces the friction between the chip and the tool surface, and ensures that the chip can be smoothly discharged.

[0046] The cutting surfaces 32 are symmetrically arranged on both sides of the first chip breaking arc surface 31, which helps to maintain the consistency of chip control under different cutting conditions (such as different cutting depths and feed rates). The setting of the cutting surfaces 32 helps to effectively guide the chip during the axial cutting process of the workpiece through the rear cutting edges 22, ensures that the chip can be curled towards the first end chip groove through the guidance of the cutting surfaces 32, and breaks during the curling transition process between the cutting surfaces 32 and the first chip breaking arc surface 31, so as to smoothly discharge the chip from the blade.

[0047] Through the synergistic effect of the arc cutting edge 21 and the rear cutting edge 22, the chip can be smoothly curled and guided during the initial formation and continuous cutting process, ensuring the effectiveness of chip control. After the chip enters the chip breaker groove 3, the first chip breaking arc surface 31 and the symmetric cutting surface 32 act together to guide the chip to continue curling and moving. When the chip length reaches a certain extent, the geometric design of the chip breaker groove 3 causes it to break at an appropriate position. The broken chip is quickly discharged through the chip breaker groove 3, preventing the chip from accumulating on the tool surface or the workpiece, reducing the risk of tool wear and chip entanglement, and improving the stability and efficiency of the machining process.

[0048] In this example, since the insert is centrosymmetric, regardless of whether machining forward (left) or backward (right), the geometric angles of the chip breaker groove 3 of the insert are the same, ensuring the stability of cutting.

[0049] As some preferred embodiments, referring to the attached Figure 3 and 4 shown, the chip breaker groove 3 further includes an arc cutting edge surface 34, and the arc cutting edge surface 34 is located between the first chip breaking arc surface 31 and the circular base curved surface 14. This structural setting adds a transition area between the first chip breaking arc surface 31 and the circular base curved surface 14, which helps to further optimize the machining effect of the insert, mainly reflected in enhancing the strength of the tip cutting edge and the chip curling ability of the chip evacuation groove.

[0050] The arc cutting edge surface 34 and the cylindrical surface 14 intersect to form the arc cutting edge 21, Addition of the arc cutting edge surface 34 making the formation of the arc cutting edge 21 smoother, thereby reducing the cutting resistance. At the same time, it avoids the risk of the tip breaking and being damaged during the cutting process due to the arc cutting edge surface 34 being too sharp.

[0051] The arc cutting edge surface 34 intersects with the first chip breaking arc surface 31 to form the front chip evacuation edge P1, and the front chip evacuation edge P1 quickly and effectively guides the chip flow direction.

[0052] The arc cutting edge surface 34 intersects with the two peripheral side surfaces 13 respectively to form the front side cutting edge 23. This design enables the insert to maintain good cutting performance in different directions during the cutting process. The setting of the front side cutting edge 23 helps to evenly distribute the cutting force during the multi-direction cutting process, ensuring the smoothness of the cutting process and the smooth evacuation of the chip. In this embodiment, the front side cutting edge 23 and the rear side cutting edge 22 have a smooth transition, so as to meet the continuous control of the chip during the cutting in the axial direction of the workpiece, ensuring that there is no obvious obstruction during the flow and fracture process of the chip, and further improving the chip evacuation efficiency.

[0053] The arc cutting edge surface 34 is tangent to the two cutting surfaces 32 respectively. Through the smooth transition design, the chip is more smoothly formed and curled.

[0054] During the actual machining process, when the cutting blade cuts forward (to the left) along the radial direction of the workpiece and the cutting depth is relatively shallow, the arc cutting edge surface 34 and the front cutting edge 23 first come into contact with the workpiece. Due to the existence of the axial rake angle and the radial rake angle, and since the rake face is an arc surface, the chip will flow towards the center line of the tool tip in a direction perpendicular to these two cutting edges (roughly at an angle of 45 degrees with the axis direction). After flowing through the arc cutting edge surface 34, it continues to flow towards the first chip-breaking arc surface 31. Because the radial curvature of the first chip-breaking arc surface 31 is larger, the chip undergoes greater curling. When the chip continues to flow, it will curl into a conical spiral chip and break when it exceeds its curling ability.

[0055] When the above process occurs at a larger cutting depth, the above-mentioned cutting process will also occur. However, due to the addition of the rear cutting edge 22 and the cutting surface 32, the curling of the chip occurs more sharply, and the chip will become more prone to breakage.

[0056] As some preferred embodiments, the chip-breaking groove 3 further includes two second chip-breaking arc surfaces 33, which are symmetrically located on both sides of the first chip-breaking arc surface 31. This structural setting balances the chip flow path and makes the chip flow more smoothly before entering the chip-breaking groove 3. The second chip-breaking arc surface 33 is located between the cutting surface 32 and the first chip-breaking arc surface 31, forming a transition region, making the chip flow more smoothly when flowing from the cutting surface 32 to the first chip-breaking arc surface 31. The second chip-breaking arc surface 33 is tangent to the first chip-breaking arc surface 31, forming an optimized chip flow path, making the chip curl towards the first chip-breaking arc surface in the second chip-breaking arc surface 33. Due to the addition of the second chip-breaking arc surface 33, the overall curvature radius of the second chip-breaking arc surface 33 and the first chip-breaking arc surface 31 in the radial direction is larger, enabling the chip to undergo greater curling and be more prone to breakage when it exceeds the chip curling ability. The cutting surface 32 and the first chip-breaking arc surface 31 intersect to form a side chip evacuation edge P2. Through the setting of the side chip evacuation edge P2, the curling of the chip occurs more sharply, and the chip will become more prone to breakage.

[0057] In this embodiment, the vertex of the arc cutting edge 21 is lower than the upper surface 11, and the distance from the upper surface 11 to the vertex of the arc cutting edge 21 is 0.01 mm to 0.5 mm. The vertex of the arc cutting edge 21 being lower than the upper surface 11 is mainly to cooperate with the grinding process to better control the center height of the cutting blade and the consistency of the ground cutting edge.

[0058] The radius of the front chip removal edge P1 ranges from 0.1 mm to 1 mm, and the radius of the arc cutting edge 21 ranges from 0.3 mm to 3 mm. The design of the larger radius of the arc cutting edge 21 increases the contact area during the cutting process, helps to disperse the cutting force, and reduces tool wear. The larger radius makes the cutting process smoother, reduces vibration and impact, and improves the machining stability and surface quality. The design of the small radius of the front chip removal edge P1 enables the chip to enter the chip breaker groove 3 more quickly, improving the chip removal efficiency. The radius of the arc cutting edge 21 is greater than the radius of the circular base surface 14. This design ensures that the arc cutting edge 21 can form a smoother transition area during the cutting process, effectively reducing friction and heat accumulation during the cutting process.

[0059] In this embodiment, the radius of the first chip breaking arc surface 31 in its central longitudinal section ranges from 3 mm to 10 mm, and the radius of the arc cutting edge surface 34 in its central longitudinal section ranges from 5 mm to 15 mm. In the specific implementation process, the radius of the first chip breaking arc surface 31 in its central longitudinal section is less than the radius of the arc cutting edge surface 34 in its central longitudinal section. With this setting, the chip continues to flow to the first chip breaking arc surface 31 after flowing through the arc cutting edge surface 34, and a larger curling radius can be formed in the first chip breaking arc surface 31, accelerating the speed of chip curling and breaking.

[0060] Further, referring to the attached Figure 5 As shown, on the central longitudinal section of the first chip breaking arc surface 31, the included angle a between the tangent line at the highest point of the arc cutting edge surface 34 and the upper surface 11 is 3° to 15°, making the cutting angle gentle and reducing the damage to the cutting edge caused by the cutting impact force. The included angle b between the tangent line at the highest point of the first chip breaking arc surface 31 and the upper surface 11 is 5° to 25°, which can form a chip breaking angle larger than the cutting angle, enabling the chip to enter the chip breaker groove 3 quickly and smoothly and be discharged. In the specific implementation process, it is set that a is less than b. In this way, during the cutting process, the chip first passes through the guidance of the smaller included angle a and then through the chip breaking process of the larger included angle b, which helps to optimize the chip flow path and reduce the chip accumulation on the tool surface.

[0061] As some preferred embodiments, referring to the attached Figure 6As shown in the figure, on the central cross-section of the first chip-breaking arc surface 31, the included angle c between the contour tangent of the cutting surface 32 and the upper surface 11 is 3° to 15°, making the cutting angle gentle and reducing the damage to the cutting edge caused by the cutting impact force. The included angle d between the contour tangent of the second chip-breaking arc surface 33 and the upper surface 11 is 5° to 25°, which can form a chip-breaking angle larger than the cutting angle, enabling the chip to quickly enter the second chip-breaking arc surface 33 and the first chip-breaking arc surface 31 under the guidance of the cutting surface 32. In the specific implementation process, c is set to be less than d, so that during the cutting process, the chip first passes through the guidance of the smaller included angle c and then through the chip-breaking process of the larger included angle d, which helps to optimize the chip flow path and reduce the accumulation of chips on the tool surface.

[0062] As some preferred embodiments, referring to the attached Figure 5 As shown in the figure, the lower end of the circular base surface 14 inclines towards the central hole 10, and the included angle e between the circular base surface 14 and the axis of the central hole 10 is 3° to 15°. With this setting, during the cutting process of the blade, the upper end of the circular base surface 14, the arc cutting edge 21, and the front cutting edge 23 will first contact the workpiece. During the gradual feed process, the lower end of the circular base surface 14 contacts the workpiece. In this way, during the cutting process, the resistance during blade cutting can be reduced, and the cutting stability and cutting efficiency can be improved.

[0063] In the prior art, in the cutting blade industry, the die pressing and sintering methods are commonly used to make different chip-breaking grooves 3 at the blade edge, expecting to achieve good chip control or chip-breaking effects and make the machined workpiece have good surface roughness. However, due to the influence of die pressing accuracy and sintering shrinkage deformation, defects such as asymmetry and inconsistent geometric morphology will occur at the chip-breaking groove 3, resulting in the actual chip-breaking groove 3 being unable to achieve the chip control effect of the design goal. At the same time, the front tool face of the die-pressed and sintered blade needs to go through a complex polishing process to achieve a good surface roughness, and a large number of defective products are easily generated during this process.

[0064] Therefore, the chip-breaking groove 3 in this embodiment is formed by a grinding process. The grinding process can provide a high-quality surface roughness while ensuring the shape of the chip-breaking groove 3, reduce or even eliminate the need for additional polishing processes, and reduce the defective product rate. The consistent geometric morphology of the chip-breaking groove 3 ensures that each cutting blade can achieve the chip control effect of the design goal, improving the machining quality and efficiency.

[0065] The chip-breaking groove is made by grinding. The chip-breaking groove has excellent precision and can accurately control the chip flow direction. The chip-breaking groove made by grinding has excellent surface roughness, making the chip evacuation smoother, prolonging the service life of the tool. At the same time, it is beneficial to machine workpieces with better surface roughness.

[0066] The chip-breaking groove made by grinding is manufactured by precise processing equipment, which can accurately control the 3D morphology of the chip-breaking groove, improve the manufacturing accuracy of the chip-breaking groove, and reduce the defective rate in the blade production process.

[0067] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A turning tool insert, comprising an insert body (1), the insert body (1) being of a polygonal structure, the insert body (1) being provided with a central hole (10), and the insert body (1) being rotationally symmetric about the central axis of the central hole (10), characterized in that: The blade body (1) includes an upper surface (11), a lower surface (12), and a plurality of peripheral side surfaces (13) connecting the upper surface (11) and the lower surface (12). Adjacent two peripheral side surfaces (13) are connected by a circular base curved surface (14), and the three form a tool tip. The upper surface (11) has a cutting edge (2) and a chip breaker groove (3) at the tool tip, and the cutting edge (2) and the chip breaker groove (3) are symmetric about the angular bisecting plane of the tool tip. The cutting edge (2) includes an arc cutting edge (21) and two rear cutting edges (22) located on both sides of the arc cutting edge (21), and the arc cutting edge (21) intersects with the angular bisecting plane of the tool tip. The chip breaker groove (3) includes a first chip breaking arc surface (31) and cutting surfaces (32) symmetrically located on both sides of the first chip breaking arc surface (31). The first chip breaking arc surface (31) is recessed from the arc cutting edge (21) towards the center hole (10). The first chip breaking arc surface (31) intersects with the circular base curved surface to form the arc cutting edge (21), and the two cutting surfaces (32) respectively intersect with the adjacent peripheral side surfaces (13) to form the rear cutting edges (22).

2. The turning insert according to claim 1, characterized in that: The chip breaker groove (3) further includes an arc cutting edge surface (34). The arc cutting edge surface (34) is located between the first chip breaking arc surface (31) and the circular base curved surface. The arc cutting edge surface (34) and the circular base curved surface intersect to form the arc cutting edge (21). The arc cutting edge surface (34) and the first chip breaking arc surface (31) intersect to form a front chip discharging edge (P1). The arc cutting edge surface (34) respectively intersects with the two peripheral side surfaces (13) to form front cutting edges (23), and the arc cutting edge surface (34) is respectively tangent to the two cutting surfaces (32).

3. The turning tool insert according to claim 2, characterized in that: The chip breaker groove (3) further includes two second chip breaking arc surfaces (33). The two second chip breaking arc surfaces (33) are symmetrically located on both sides of the first chip breaking arc surface (31), and the second chip breaking arc surfaces (33) are located between the cutting surfaces (32) and the first chip breaking arc surface (31). The second chip breaking arc surfaces (33) are tangent to the first chip breaking arc surface (31), and the cutting surfaces (32) and the first chip breaking arc surface (31) intersect to form side chip discharging edges (P2).

4. The turning insert according to claim 3, characterized in that: The vertex of the arc cutting edge (21) is lower than the upper surface (11), and the distance from the upper surface (11) to the vertex of the arc cutting edge (21) is 0.01 mm to 0.5 mm.

5. The turning insert according to claim 4, characterized in that: The radius of the front chip discharging edge (P1) ranges from 0.1 mm to 1 mm, the radius of the arc cutting edge (21) ranges from 0.03 mm to 3 mm, and the radius of the arc cutting edge (21) is greater than the radius of the circular base curved surface.

6. The turning insert according to claim 4, wherein: The radius of the first chip breaking arc surface (31) in its central longitudinal section ranges from 3 mm to 10 mm, the radius of the arc cutting edge surface (34) in its central longitudinal section ranges from 5 mm to 15 mm, and the radius value of the arc cutting edge surface (34) must be greater than the radius of the first chip breaking arc surface (31).

7. The turning insert according to claim 6, characterized in that: On the central longitudinal section of the first chip-breaking arc surface (31), the included angle a between the tangent line at the highest point of the arc cutting edge surface (34) and the upper surface (11) is 3° to 15°, and the included angle b between the tangent line at the highest point of the first chip-breaking arc surface (31) and the upper surface (11) is 5° to 25°.

8. The turning tool insert according to claim 7, characterized in that: On the central cross-section of the first chip-breaking arc surface (31), the included angle c between the contour tangent line of the cutting surface (32) and the upper surface (11) is 3° to 15°, and the included angle d between the contour tangent line of the second chip-breaking arc surface (33) and the upper surface (11) is 5° to 25°.

9. The turning insert according to claim 1, characterized in that: The lower end of the circular base surface inclines towards the central hole (10), and the included angle e between the circular base surface and the axis of the central hole (10) is 3° to 15°.

10. The turning tool insert according to claim 1, characterized in that: The chip-breaking groove (3) is formed by a grinding process.

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