Round double-side cutting blade with anti-rotation structure and milling cutter

Abstract

The invention discloses a circular double-side cutting blade with an anti-rotation structure and a milling cutter, the circumferential side surface of the circular double-side cutting blade intersects with the upper end face and the lower end face to form an upper cutting edge and a lower cutting edge, and the circumferential side surface comprises a plurality of radial convex parts and a plurality of radial concave parts; the radial protruding parts and the radial concave parts are alternately arranged in the circumferential direction, the circumferential side surface is provided with alternate concave curves and convex curves on any radial section of the circular double-side cutting blade, and the radial protruding parts and the radial concave parts are obliquely arranged along the circumferential side surface. An included angle theta is formed between the inclination direction of the radial protruding part and the axial direction of the circular double-side cutting blade and between the inclination direction of the radial concave part and the axial direction of the circular double-side cutting blade, the upper end face rotates by the angle theta with the blade center axis as the center and then coincides with the projection of the lower end face in the axial direction, and a blade installation groove of a milling tool corresponds to the circular double-side cutting blade. The device has the advantages of convenience in assembly and disassembly, stability and reliability in positioning, difficulty in deflection and the like.

Description

Technical Field

[0001] The invention mainly relates to metal cutting tools, in particular to a circular double-sided cutting blade and a milling tool with an anti-rotation structure. Background Art

[0002] Generally, the circular blade used for milling is a positive angle single-sided blade without anti-rotation structure. This blade is installed on the corresponding milling tool and fixed in the tool groove by the clamping screw. The cutting blade is subjected to the reaction force from the workpiece and chips during the cutting process, thereby generating a rotation torque centered on the central axis of the screw hole. This torque may loosen the screw, so that the blade cannot be pressed tightly, resulting in cutting vibration, causing the blade to break easily, reducing its life, and even flying out of the tool groove.

[0003] In order to solve the above problems, the cutting blades in the prior art have positioning grooves at the bottom of the blades, or convex or concave planes are provided on the sides of the blades as positioning surfaces to prevent rotation. For example, Chinese patent document CN114012153A discloses a cutting tool, but this structure is limited by the grooves on the lower surface or side of the blades, and is only suitable for single-sided blades, and the blade utilization rate is low; Chinese patent document CN107538020A discloses an anti-rotation circular blade, which is provided with at least one arc-shaped groove on the inner surface of the center hole that can cooperate with the surface of the fastening screw that fixes the circular cutting blade, and the screw is positioned and anti-rotated in an eccentric manner with the screw hole of the blade, but this structure is only applicable to single-sided blades; Chinese patent document CN111788028A discloses another solution, which designs an anti-rotation double-sided blade, and adopts a plurality of angled and spaced indexing latches protruding from the side as an anti-rotation structure, but this structure mainly sets the back angle to 0°, that is, it is only applicable to negative angle blades. Compared with positive angle blades, negative angle blades have too large cutting force, higher machine tool load requirements, and too large impact during the cutting process. In addition, most of the anti-rotation positioning surface designs in the prior art are mainly based on cut planes and vertical raised surfaces on the side walls, which can provide a positioning function, but the clamping is completely dependent on the clamping force of the screws, which has poor stability and is prone to damage. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a circular double-sided cutting blade and a milling tool with an anti-rotation structure, which are stable and reliable in positioning and not prone to deflection.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A circular double-sided cutting blade with an anti-rotation structure, comprising an upper end face, a lower end face and a circumferential side surface connecting the upper end face and the lower end face, the circular double-sided cutting blade also having a center hole penetrating the upper end face and the lower end face, the circumferential side surface respectively intersecting with the upper end face and the lower end face to form an upper cutting edge and a lower cutting edge, the circumferential side surface comprising a plurality of radial protrusions and a plurality of radial recesses, the radial protrusions and the radial recesses being alternately arranged along the circumferential direction, the circumferential side surface being alternating recessed curves and convex curves on any radial cross section of the circular double-sided cutting blade, the radial protrusions and the radial recesses being inclined along the circumferential side surface, the inclination directions of the radial protrusions and the radial recesses both having an angle θ with the axial direction of the circular double-sided cutting blade, the upper end face being rotated by an angle θ around the center axis of the blade so as to coincide with the projection of the lower end face in the axial direction.

[0007] As a further improvement of the above technical solution:

[0008] The angle θ between the inclination directions of the radial protrusion and the radial recess and the axial direction of the circular double-sided cutting blade satisfies: -45°≤θ≤45°.

[0009] The circumferential side surface constitutes the back cutting surface of the circular double-sided cutting blade, the waistline contour line of the circumferential side surface is a curve, and the tangent line of the waistline contour line and the parallel line of the center hole axis have an angle α, and satisfy 0°≤α≤20°.

[0010] The upper cutting edge is rotated by an angle θ around the central axis of the insert and coincides with the projection of the lower cutting edge in the axial direction.

[0011] The upper cutting edge and the lower cutting edge are both composed of multiple arc segments, and are convex arc segments 4a and concave arc segments 4b arranged alternately. The junction of the convex arc segment 4a and the concave arc segment 4b is tangent, the radius of the convex arc segment 4a is r3, the radius of the concave arc segment 4b is r4, and satisfies: r3≥r4.

[0012] All of the convex arc segments 4a are inscribed in a circle with a radius of r1 and the same center as the center hole, and all of the concave arc segments 4b are circumscribed in a circle with a radius of r2 and the same center as the center hole, and satisfy: r1-r2≥0.5mm.

[0013] The convex arc segments 4a and the concave arc segments 4b are equidistantly distributed along the circumference of the circular double-sided cutting blade, and the number of the convex arc segments 4a and the concave arc segments 4b is N, and N satisfies: N≥4.

[0014] A milling tool comprises a tool body and a circular double-sided cutting blade with an anti-rotation structure according to the present invention, wherein the tool body is provided with a blade mounting groove, and the circular double-sided cutting blade is mounted in the blade mounting groove, and the blade mounting groove comprises a bottom supporting surface and a side supporting surface, and the side supporting surface is arranged corresponding to the circumferential side surface, and after the circular double-sided cutting blade is installed in place, the center line of the blade mounting groove is parallel to the axis of the center hole.

[0015] As a further improvement of the above technical solution:

[0016] The knife body is provided with a plurality of blade mounting grooves.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] The circular double-sided cutting blade with an anti-rotation structure of the present invention comprises an upper end face, a lower end face and a circumferential side surface connecting the upper end face and the lower end face. The circular double-sided cutting blade is also provided with a center hole penetrating the upper end face and the lower end face. The circumferential side surface intersects with the upper end face and the lower end face to form an upper cutting edge and a lower cutting edge respectively. The circumferential side surface comprises a plurality of radial protrusions and a plurality of radial recesses. The radial protrusions and the radial recesses are alternately arranged along the circumferential direction. The circumferential side surface is an alternating recessed curve and a convex curve on any radial cross section of the circular double-sided cutting blade. The radial protrusions and the radial recesses are inclinedly arranged along the circumferential side surface. The projections of the upper end face and the lower end face in the axial direction coincide with each other. The inclined radial protrusions The radial recessed portion can increase the positioning contact area of ​​the circumferential side surface of the cutting blade, and can also generate an axially downward pressing force and a torque force opposite to the rotation direction of the cutting blade on the cutting blade during cutting processing, effectively preventing the circular double-sided cutting blade from deflecting relative to the cutter body during cutting, and improving the stability and reliability of the positioning and clamping of the cutting blade. The circumferential side surface on any radial section of the circular double-sided cutting blade is alternating concave curves and convex curves, that is, the upper cutting edge and the lower cutting edge are both corrugated curved cutting edges. This cutting edge has a good chip-splitting effect during the cutting process, which can effectively improve the distribution of cutting force on the cutting edge and increase the service life of the circular double-sided cutting blade.

[0019] The milling tool of the present invention comprises a tool body and a circular double-sided cutting blade with an anti-rotation structure of the present invention. A blade mounting groove is provided on the tool body, and the circular double-sided cutting blade is mounted in the blade mounting groove. The blade mounting groove comprises a bottom supporting surface and a side supporting surface, and the side supporting surface is arranged corresponding to the circumferential side surface. After the circular double-sided cutting blade is installed in place, the center line of the blade mounting groove is parallel to the axis of the center hole, and the circular double-sided cutting blade is stably and reliably positioned in the blade mounting groove and is not prone to deflection. Therefore, the milling tool is easy to disassemble and assemble, and has good processing quality and high precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional view of a circular double-sided cutting blade with an anti-rotation structure according to the present invention.

[0021] Figure 2 It is a front view of a circular double-sided cutting blade with an anti-rotation structure according to the present invention.

[0022] Figure 3 It is a top view of a circular double-sided cutting blade with an anti-rotation structure according to the present invention.

[0023] Figure 4 It is a stereogram of the milling cutter of the present invention.

[0024] Figure 5 It is a front view of the milling cutter of the present invention.

[0025] Figure 6 Schematic diagram of the blade mounting slot of the milling tool of the present invention.

[0026] Figure 7 It is a schematic diagram of a circular double-sided cutting blade with an anti-rotation structure of the present invention being positioned and installed on a milling tool.

[0027] The symbols in the figure represent:

[0028] 1. Upper end face; 2. Lower end face; 3. Circumferential side surface; 31. Radial protrusion; 32. Radial recess; 41. Upper cutting edge; 42. Lower cutting edge; 4a. Convex arc segment; 4b. Concave arc segment; 5. Center hole; 6. Waistline contour line; 7. Cutting body; 8. Blade mounting groove; 81. Bottom support surface; 82. Side support surface. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] In the description of the present invention, it should be noted that terms such as "center", "up", "down", "horizontal", "inside", "outside", "top", and "bottom" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0031] Figures 1 to 3An embodiment of a circular double-sided cutting insert with an anti-rotation structure of the present invention is shown, the circular double-sided cutting insert with an anti-rotation structure comprises an upper end face 1, a lower end face 2 and a circumferential side surface 3 connecting the upper end face 1 and the lower end face 2, the circular double-sided cutting insert is also provided with a center hole 5 penetrating the upper end face 1 and the lower end face 2, the circumferential side surface 3 intersects with the upper end face 1 and the lower end face 2 to form an upper cutting edge 41 and a lower cutting edge 42, the circumferential side surface 3 comprises a plurality of radial protrusions 31 and a plurality of radial recesses 32 (such as Figure 3 As shown, the radial protrusions 31 and the radial recesses 32 in this embodiment are both 8 in number), the radial protrusions 31 and the radial recesses 32 are alternately arranged along the circumferential direction, the circumferential side surface 3 on any radial cross section of the circular double-sided cutting insert is an alternating recessed curve and a convex curve, the radial protrusions 31 and the radial recesses 32 are tilted along the circumferential side surface 3, the projections of the upper end surface 1 and the lower end surface 2 in the axial direction coincide, the tilted radial protrusions 31 and the radial recesses 32 can increase the positioning contact area of ​​the circumferential side surface 3 of the cutting insert, and can also be used for cutting the cutting insert during cutting. The blade 2 generates an axially downward pressing force and a torque force opposite to the rotation direction of the cutting blade 2, which effectively prevents the circular double-sided cutting blade from deflecting relative to the cutter body during cutting, thereby improving the stability and reliability of the positioning and clamping of the cutting blade. The circumferential side surface 3 on any radial section of the circular double-sided cutting blade is an alternating concave curve and convex curve, that is, the upper cutting edge 41 and the lower cutting edge 42 are both corrugated curved cutting edges. This cutting edge has a good chip-splitting effect during the cutting process, which can effectively improve the distribution of cutting force on the cutting edge and increase the service life of the circular double-sided cutting blade.

[0032] The positioning of the cutting blade 2 mainly relies on the locking action of the fastener, which presses the cutting blade against the bottom support surface and the side wall support surface of the tool groove, and the radial protrusion 31 and the radial recessed portion 32 can provide a friction force inclined along the angle θ, which is decomposed into axial and circumferential friction forces. The axial friction force is consistent with the direction of the clamping force of the fastener, and the circumferential friction force can play an anti-rotation role. In order to avoid excessive circumferential friction that affects the clamping of the screw on the blade and affects the reliability of the blade installation, the inclination directions of the radial protrusion 31 and the radial recessed portion 32 satisfy the angle θ with the axial direction of the circular double-sided cutting blade: -45°≤θ≤45°. In this embodiment, θ=30°.

[0033] In this embodiment, the circumferential side surface 3 constitutes the back cutting surface of the circular double-sided cutting blade, the waistline contour line 6 of the circumferential side surface 3 is a curve, and there is an angle α between the tangent line of the waistline contour line 6 and the parallel line of the axis of the center hole 5. In order to reduce the cutting force during the cutting process and ensure the edge strength of the circular double-sided cutting blade, so as not to cause the edge strength to drop too much due to an excessive back angle and become unsuitable for the application environment of general rough processing of circular blades, the following should be satisfied: 0°≤α≤20°. In this embodiment, α=11°.

[0034] In this embodiment, the upper cutting edge 41 is rotated by an angle θ about the central axis of the insert so as to coincide with the projection of the lower cutting edge 42 in the axial direction.

[0035] In this embodiment, the upper cutting edge 41 and the lower cutting edge 42 are both composed of multiple circular arcs, and are convex arc segments 4a and concave arc segments 4b arranged alternately. The junction of the convex arc segment 4a and the concave arc segment 4b is tangent, the radius of the convex arc segment 4a is r3, and the radius of the concave arc segment 4b is r4, and satisfies: r3≥r4. The upper cutting edge 41 and the lower cutting edge 42 are composed of the convex arc segment 4a and the concave arc segment 4b, which can reduce the processing difficulty of the circular double-sided cutting blade. The convex arc segment 4a plays a major cutting role, and r3≥r4 is set. Because the smaller r3 is, the smaller the strength of the radial protrusion 31 is. Circular blades are mainly used in the field of rough processing, and the edge impact is large. If the radius of the radial protrusion 31 is too small, the edge strength at the radial protrusion 31 will decrease, which will make the blade more prone to chipping.

[0036] In this embodiment, all convex arc segments 4a are inscribed in a circle with a radius of r1 and the same center as the center hole 5, and all concave arc segments 4b are circumscribed in a circle with a radius of r2 and the same center as the center hole 5. In order to ensure that the radial recessed portion 32 has a sufficient depth and the circumferential friction force can ensure the anti-rotation effect of the structure, it should meet the following conditions: r1-r2≥0.5mm. In this embodiment, r1-r2=0.8mm.

[0037] In this embodiment, the convex arc segments 4a and the concave arc segments 4b are equidistantly distributed along the circumference of the circular double-sided cutting blade, and the number of convex arc segments 4a and concave arc segments 4b is N. The number of convex arc segments 4a and concave arc segments 4b affects the number of times the blade can be rotated, that is, the number of usable edges. N satisfies: N≥4, that is, the blade can be rotated at least 4 times, which can improve the cost-effectiveness of the blade. In this embodiment, N is equal to 8.

[0038] Figures 4 to 7An embodiment of a milling tool of the present invention is shown, which includes a tool body 7 and a circular double-sided cutting blade with an anti-rotation structure in the above embodiment. A blade mounting groove 8 is provided on the tool body 7, and the circular double-sided cutting blade is mounted in the blade mounting groove 8. The blade mounting groove 8 includes a bottom support surface 81 and a side support surface 82. The side support surface 82 is arranged corresponding to the circumferential side surface 3. After the circular double-sided cutting blade is installed in place, the center line of the blade mounting groove 8 is parallel to the axis of the center hole 5. The circular double-sided cutting blade is stably and reliably positioned in the blade mounting groove 8 and is not prone to deflection. Therefore, the milling tool is easy to disassemble and assemble, and has good processing quality and high precision.

[0039] In this embodiment, a plurality of blade mounting grooves 8 are formed on the blade body 7 .

[0040] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A circular double-sided cutting blade with an anti-rotation structure, comprising an upper end face (1), a lower end face (2) and a circumferential side surface (3) connecting the upper end face (1) and the lower end face (2), the circular double-sided cutting blade further comprising a center hole (5) penetrating the upper end face (1) and the lower end face (2), the circumferential side surface (3) intersecting with the upper end face (1) and the lower end face (2) to form an upper cutting edge (41) and a lower cutting edge (42), characterized in that: The circumferential side surface (3) comprises a plurality of radial protrusions (31) and a plurality of radial recesses (32), wherein the radial protrusions (31) and the radial recesses (32) are alternately arranged along the circumferential direction, and the circumferential side surface (3) is an alternating recessed curve and a convex curve on any radial cross section of the circular double-sided cutting blade, and the radial protrusions (31) and the radial recesses (32) are arranged obliquely along the circumferential side surface (3), and the inclination directions of the radial protrusions (31) and the radial recesses (32) have an angle θ with the axial direction of the circular double-sided cutting blade, and the upper end surface (1) coincides with the projection of the lower end surface (2) in the axial direction after rotating by an angle θ around the central axis of the blade.

2. The circular double-sided cutting insert with an anti-rotation structure according to claim 1, characterized in that: The angle θ between the inclination directions of the radial protrusion (31) and the radial recess (32) and the axial direction of the circular double-sided cutting blade satisfies: -45°≤θ≤45°.

3. The circular double-sided cutting insert with an anti-rotation structure according to claim 2, characterized in that: The circumferential side surface (3) constitutes the back cutting surface of the circular double-sided cutting blade, the waistline contour line (6) of the circumferential side surface (3) is a curve, and the tangent line of the waistline contour line (6) and the parallel line of the axis of the center hole (5) have an angle α, and satisfy 0°≤α≤20°.

4. The circular double-sided cutting insert with an anti-rotation structure according to any one of claims 1 to 3, characterized in that: The upper cutting edge (41) is rotated by an angle θ around the central axis of the blade so as to coincide with the projection of the lower cutting edge (42) in the axial direction.

5. The circular double-sided cutting insert with an anti-rotation structure according to claim 4, characterized in that: The upper cutting edge (41) and the lower cutting edge (42) are both composed of multiple circular arcs, and are convex circular arc segments (4a) and concave circular arc segments (4b) that are alternately arranged. The convex circular arc segments (4a) and the concave circular arc segments (4b) are tangent at their junction. The radius of the convex circular arc segment (4a) is r3, and the radius of the concave circular arc segment (4b) is r4, and the following condition is satisfied: r3≥r4.

6. The circular double-sided cutting insert with an anti-rotation structure according to claim 5, characterized in that: All of the convex arc segments (4a) are inscribed in a circle having a radius of r1 and being concentric with the center hole (5), and all of the concave arc segments (4b) are circumscribed in a circle having a radius of r2 and being concentric with the center hole (5), and satisfy: r1-r2≥0.5mm.

7. The circular double-sided cutting insert with an anti-rotation structure according to claim 5, characterized in that: The convex circular arc segments (4a) and the concave circular arc segments (4b) are both equidistantly distributed along the circumference of the circular double-sided cutting blade, and the number of the convex circular arc segments (4a) and the number of the concave circular arc segments (4b) are both N, and N satisfies: N≥4.

8. A milling tool, characterized in that: It comprises a tool body (7) and a circular double-sided cutting blade with an anti-rotation structure as described in any one of claims 1 to 7, wherein a blade mounting groove (8) is provided on the tool body (7), and the circular double-sided cutting blade is mounted in the blade mounting groove (8), and the blade mounting groove (8) comprises a bottom supporting surface (81) and a side supporting surface (82), and the side supporting surface (82) is arranged corresponding to the circumferential side surface (3), and after the circular double-sided cutting blade is installed in place, the center line of the blade mounting groove (8) is parallel to the axis of the center hole (5).

9. The milling tool according to claim 8, characterized in that: The blade body (7) is provided with a plurality of blade mounting grooves (8).

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