Milling insert and tool

Abstract

The invention belongs to the technical field of cutters, and discloses a milling blade and a cutter, and when a blade before grinding cannot be used due to serious abrasion, a part to be ground is ground off to obtain a ground blade. The to-be-sharpened part and the sharpened blade meet the requirements that one side of the front blade face is connected with the rear blade face to form a cutting edge, the other side of the front blade face is connected with the axial end face, and the other side of the rear blade face is connected with the positioning side face, so that the rear angle of the blade before being sharpened is smaller than that of the sharpened blade, and the smaller the rear angle of the blade is, the sharper the blade is; in other words, the sharpening front blade is sharper than the sharpening rear blade, the sharper sharpening front blade can be suitable for the working condition from semi-finish milling to finish milling, the relatively blunt sharpening rear blade can be suitable for the working condition from rough milling to semi-finish milling, and the purpose that the sharpening front blade and the sharpening rear blade are suitable for different milling working conditions respectively is achieved; on the basis that the service life of the blade before grinding is guaranteed, the milling performance of the blade after grinding is guaranteed, the service life of the blade after grinding is prolonged, and economical efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cutting tools, and in particular to a milling blade and a cutting tool. Background Art

[0002] Turbine housings in the automotive industry, large castings for engineering machinery and other parts require large amounts of machining allowances and are processed using difficult-to-machine materials such as heat-resistant stainless steel and ductile iron, resulting in high tool consumption and high processing costs. Summary of the invention

[0003] The object of the present invention is to provide a milling insert and a tool, which can adapt the milling insert before and after grinding to different working conditions, so as to extend the service life of the milling insert and improve the economic efficiency.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A milling blade, comprising a ground blade with a central through hole, and a to-be-ground portion integrally formed on the ground blade to form a front-ground blade, wherein the ground blade comprises a plurality of positioning side surfaces sequentially arranged along the circumference of the central through hole, and two axial end surfaces oppositely arranged along the axial direction of the central through hole;

[0006] The sharpened blade and the portion to be sharpened both include a plurality of cutting units corresponding one to one with the positioning side surfaces, the cutting units include a rake face, a cutting edge and a flank face, one side of the rake face is connected to the flank face to form the cutting edge, the other side of the rake face is connected to the axial end face, and the other side of the flank face is connected to the positioning side surface.

[0007] As an implementation scheme of the above-mentioned milling blade, for the blade before grinding, the maximum length of the back cutting surface along the axial direction of the central through hole is H1, 0.8mm≤H1≤1.5mm;

[0008] For the blade after grinding, the maximum length of the flank surface along the axial direction of the central through hole is H2, and H2≥H1.

[0009] As an implementation scheme of the above-mentioned milling insert, for the blade before grinding, the angle between the positioning side surface and the back cutting surface connected thereto is β1, 7°≤β1≤15°;

[0010] For the blade after grinding, the angle between the positioning side surface and the back cutting surface connected thereto is β2, and 5°≤β2≤15°.

[0011] As an implementation scheme of the above-mentioned milling blade, the rake face of the blade before grinding is recorded as the rake face before grinding; for the blade after grinding, the rake face includes a first rake face and a second rake face, one side of the first rake face is smoothly connected to the cutting edge, and the other side is smoothly connected to the second rake face, and the second rake face is smoothly connected to the axial end face through a transition arc surface;

[0012] The cutting edge is a plane and is perpendicular to the central axis of the central through hole. The front cutting edge before grinding is an inclined plane. The first front cutting edge is a circular arc convex surface, and the second front cutting edge is a circular arc concave surface.

[0013] As an implementation scheme of the above-mentioned milling blade, the cutting edge of the blade before grinding, the cutting edge of the blade after grinding, the front cutting face before grinding, the first cutting face, the second cutting face and the preset cross section have intersection lines with the front cutting edge intersection line, the rear cutting edge intersection line, the front cutting face intersection line, the first cutting face intersection line and the second cutting face intersection line, respectively, and the preset cross section is perpendicular to the positioning side surface corresponding to the front cutting face and perpendicular to the axial end surface;

[0014] The intersection point of the cutting edge intersection line before grinding and the front cutting face intersection line before grinding is point P, and the angle between the tangent line of the front cutting face intersection line before grinding at point P and the cutting edge intersection line before grinding is α1, 12°≤α1≤18°;

[0015] The intersection point of the grinding cutting edge intersection line and the first rake face intersection line is point Q, and the angle between the tangent line of the grinding cutting edge intersection line at point Q and the grinding cutting edge intersection line is α2, 8°≤α2≤25°;

[0016] Two adjacent cutting edges are smoothly connected by a circular arc edge, the projection of the circular arc edge in the plane where the axial end face is located is the circular arc edge projection, and the curvature radius of the circular arc edge projection away from the edge of the side of the central through hole is R1, 0.8mm≤R1≤1.2mm;

[0017] The arc curvature of the intersection line of the first rake face is R2, 0.6mm≤R2≤1.5mm;

[0018] The arc curvature of the intersection line of the second rake face is R3, 0.6 mm≤R3≤1.2 mm.

[0019] As an implementation scheme of the above-mentioned milling insert, the flank surface has a first edge connected to the positioning side surface, and a second edge connected to the cutting edge;

[0020] The axial end surface has a third edge connected to the transition arc surface, and for the blade before grinding, the distance between the second edge and the third edge along the preset direction is K1, K1 ≥ 1.8 mm;

[0021] For the blade after grinding, the distance between the second edge and the third edge along the preset direction is K2, K2 ≥ 1.2 mm;

[0022] The preset direction is parallel to the preset cross section and perpendicular to the central axis of the central through hole.

[0023] As an implementation scheme of the above-mentioned milling blade, for the blade before grinding, the width of the cutting edge along the preset direction is C1; for the blade after grinding, the width of the cutting edge along the preset direction is C2; C2≥C1.

[0024] As an implementation scheme of the above-mentioned milling blade, for the blade before grinding, the angle between the flank face and the corresponding rake face before grinding is γ1, γ1 = 90° - β1 - α1;

[0025] For the repaired blade, the angle between the tangent line at the position where the first rake face and the cutting edge meet and the flank face is γ2, γ2=90°+β2-α2, γ2>γ1.

[0026] As an implementation scheme of the above-mentioned milling insert, the plurality of cutting units are arranged rotationally symmetrically along the circumference of the central through hole;

[0027] And / or, the blades before grinding are symmetrically arranged about a preset symmetry plane, and the preset symmetry plane is parallel to the axial end surface and perpendicular to the central axis of the central through hole.

[0028] In order to achieve the above object, the present invention further provides a tool, comprising a cutter disc and a milling blade as described in any of the above schemes, wherein the milling blade is mounted on the cutter disc; a plurality of the milling blades are provided, and the plurality of the milling blades are arranged at intervals along the circumference of the cutter disc;

[0029] The projection of the cutting edge in a preset projection plane is a main edge projection, and the preset projection plane is parallel to the central axis of the cutter disc and perpendicular to the central axis of the central through hole on the milling blade where the cutting edge is located;

[0030] The angle between the main blade projection and the preset plane is Kr, 42°≤Kr≤45°, and the preset plane is perpendicular to the central axis of the cutter disc.

[0031] Beneficial effects of the present invention: The milling blade and tool provided by the present invention can grind off the portion to be grinded to obtain the blade after grinding when the blade before grinding cannot be used due to severe wear. Since for both the portion to be grinded and the blade after grinding, one side of the front blade face is connected to the back blade face to form a cutting edge, the other side of the front blade face is connected to the axial end face, and the other side of the back blade face is connected to the positioning side face, so that the back angle of the blade before grinding is smaller than the back angle of the blade after grinding, and the smaller the back angle of the blade, the sharper the blade, in other words, the blade before grinding is sharper than the blade after grinding, and the sharper front blade before grinding can be applied to the working conditions of semi-finishing milling to finishing milling, and the relatively blunt blade after grinding can be applied to the working conditions of rough milling to semi-finishing milling, so that the front blade before grinding and the blade after grinding can be applied to different milling working conditions respectively, and the milling performance of the blade after grinding can be guaranteed on the basis of ensuring the service life of the front blade before grinding, and the service life of the blade after grinding can be extended, and the economic efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of a blade before grinding provided by an embodiment of the present invention;

[0033] Figure 2 yes Figure 1 Axial schematic diagram of

[0034] Figure 3 is a side view of a blade before grinding provided by an embodiment of the present invention;

[0035] Figure 4 yes Figure 2 Middle AA section Figure 1 ;

[0036] Figure 5 yes Figure 4 Dimensional relationship diagram;

[0037] Figure 6 is a schematic structural diagram of a blade after grinding provided by an embodiment of the present invention;

[0038] Figure 7 yes Figure 6 Axial schematic diagram of

[0039] Figure 8 yes Figure 7 Middle BB section Figure 1 ;

[0040] Fig. 9 yes Figure 8 Dimensional relationship diagram;

[0041] Fig.10 It is a schematic structural diagram of a milling tool provided by an embodiment of the present invention.

[0042] In the figure:

[0043] 1. Knife plate;

[0044] 2. Milling blade; 21. Positioning side; 22. Axial end face; 2301. Grinding front cutting edge; 2302. Grinding rear cutting edge; 231. Rake face; 2311. Grinding front rake face; 2312. First rake face; 2313. Second rake face; 2314. Transition arc face; 2321. Grinding front and rear rake faces; 2322. Grinding rear rake face; 24. First arc face; 25. Second arc face;

[0045] 261, cutting edge intersection line before grinding; 262, cutting edge intersection line after grinding; 263, front cutting face intersection line before grinding; 264, first front cutting face intersection line; 265, second front cutting face intersection line; 27, center through hole;

[0046] 3. Tighten the screws;

[0047] 4. Preset symmetry plane;

[0048] 5. Preset cross section;

[0049] 10, first edge; 101, first front edge; 102, first rear edge; 20, second edge; 201, second front edge; 202, second rear edge;

[0050] 100, blade before grinding; 200, blade after grinding; 300, portion to be ground. DETAILED DESCRIPTION

[0051] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0052] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0054] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0055] like Figures 1 to 9 As shown, an embodiment of the present invention provides a milling insert, which includes a ground insert 200 having a central through hole 27 and a to-be-ground portion 300 integrally formed with the ground insert 200 to form a ground insert 100 .

[0056] The ground blade 200 includes a plurality of positioning side surfaces 21 sequentially arranged along the circumference of the central through hole 27, and two axial end surfaces 22 arranged opposite to each other along the axial direction of the central through hole 27; the ground blade 200 and the portion to be ground 300 both include a plurality of cutting units corresponding one to one to the positioning side surfaces 21, and the cutting units include a rake face 231, a cutting edge and a flank face, one side of the rake face 231 is connected to one side of the flank face to form a cutting edge, the other side of the rake face 231 is connected to the axial end surface 22, and the other side of the flank face is connected to the positioning side surface 21.

[0057] When the blade 100 before grinding cannot be used any more due to severe wear, the portion to be ground 300 can be ground off to obtain the blade 200 after grinding. Since for the portion to be ground 300 and the blade 200 after grinding, one side of the front cutting edge 231 is connected to the back cutting edge to form a cutting edge, the other side of the front cutting edge 231 is connected to the axial end face 22, and the other side of the back cutting edge is connected to the positioning side face 21, so that the back angle of the front grinding blade 100 will be smaller than the back angle of the back grinding blade 200. The smaller the back angle of the blade, the sharper the blade. In other words, the front grinding blade 100 is sharper than the back grinding blade 200. The sharper front grinding blade 100 can be used for semi-finishing milling to fine milling conditions, and the relatively dull back grinding blade 200 can be used for rough milling to semi-finishing milling conditions, so that the front grinding blade 100 and the back grinding blade 200 are respectively suitable for different milling conditions, and on the basis of ensuring the service life of the front grinding blade 100, the milling performance of the back grinding blade 200 can be guaranteed, the service life of the back grinding blade 200 can be extended, and the economy can be improved.

[0058] Specifically, the back cutting edge has a first edge 10 connected to the positioning side surface 21, and a second edge 20 connected to the cutting edge; for the blade 100 before grinding, the first edge 10 is closer to the central axis of the central through hole 27 than the second edge 20; for the blade 200 after grinding, the second edge 20 is closer to the central axis of the central through hole 27 than the first edge 10.

[0059] For ease of understanding, the following description will refer to the back face of the front blade 100 after grinding as the ground front and rear blade faces 2321, and the back face of the rear blade 200 after grinding as the ground rear blade face 2322; the first edge 10 of the ground front and rear blade faces 2321 will be referred to as the first front edge 101, and the second edge 20 will be referred to as the second front edge 201; the first edge 10 of the ground rear blade face 2322 will be referred to as the first rear edge 102, and the second edge 20 will be referred to as the second rear edge 202.

[0060] The first front edge 101 is closer to the central axis of the central through hole 27 than the second front edge 201, and the second rear edge 202 is closer to the central axis of the central through hole 27 than the first rear edge 102, so that the back angle of the front blade 100 after grinding is much smaller than the back angle of the rear blade 200 after grinding, so that the front blade 100 after grinding is sharper than the rear blade 200 after grinding.

[0061] Furthermore, if Figure 5 and Fig. 9 As shown, the maximum length of the ground front and rear blade surfaces 2321 along the axial direction of the central through hole 27 is H1, 0.8mm≤H1≤1.5mm. The maximum length of the ground rear blade surface 2322 along the axial direction of the central through hole 27 is H2, H2≥H1.

[0062] By limiting H1, the structural strength of the blade 100 before grinding can be ensured, and at the same time, it is convenient to grind the front and rear cutting edges 2321 to obtain the rear cutting edge 2322 with H2≥H1.

[0063] By limiting H2, it can be ensured that when the front and rear cutting edges 2321 are ground, the front and rear cutting edges 2321 are ground clean to obtain the ground rear cutting edge 2322. Since the second rear edge 202 is closer to the positioning side surface 21 than the second front edge 201, H2≥H1.

[0064] It should be noted that H1 can select any value between 0.8 mm and 1.5 mm, such as H1 can select any value among 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, and 1.5 mm.

[0065] Furthermore, if Figure 5 and Fig. 9 As shown, the angle between the positioning side surface 21 and the grinding back blade surface connected thereto is β1, 7°≤β1≤15°. By limiting β1, the sharpness of the blade 100 before grinding is guaranteed, and the structural strength of the blade 100 before grinding can be taken into account.

[0066] It should be noted that β1 can select any angle value between 7° and 15°, such as β1 can select any angle of 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, and 15°.

[0067] The angle between the positioning side surface 21 and the ground back blade face 2322 connected thereto is β2, 5°≤β2≤15°. By limiting β2, the structural strength of the ground blade 200 can be ensured, while ensuring that the ground front blade face 2311 of the portion to be ground 300 can be completely removed.

[0068] It should be noted that β2 can select any angle value between 5° and 15°, such as β2 can select any angle of 5°, 6°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, and 15°.

[0069] Furthermore, if Figure 1 , Figure 4 and Figure 8 As shown, the front cutting surface 231 of the blade 100 before grinding is recorded as the front cutting surface 2311 before grinding; for the blade 200 after grinding, the front cutting surface 231 includes a first front cutting surface 2312 and a second front cutting surface 2313, one side of the first front cutting surface 2312 is smoothly connected to the cutting edge, and the other side is smoothly connected to the second front cutting surface 2313, and the second front cutting surface 2313 is smoothly connected to the axial end face 22 through a transition arc surface 2314.

[0070] The cutting edge is a plane and perpendicular to the central axis of the central through hole 27 . The front rake surface 2311 before grinding is an inclined plane. The first rake surface 2312 is a circular arc convex surface, and the second rake surface 2313 is a circular arc concave surface.

[0071] For the front blade 100, the front rake face 2311 of the front blade 100 is used for cutting, and the first rake face 2312 and the second rake face 2313 are used for chip removal. The above arrangement can improve the chip removal performance of the front blade 100 during milling. For the rear blade 200, the front rake face 2311 of the front blade 100 is ground off, the first rake face 2312 is used for cutting, and the second rake face 2313 is used for chip removal. The cutting edge is a plane with a certain width and perpendicular to the central through hole 27, which is simple to manufacture and has good dimensional stability.

[0072] Two adjacent flank surfaces are smoothly connected via a first arc surface 24 , and two adjacent positioning side surfaces 21 are smoothly connected via a second arc surface 25 .

[0073] Furthermore, if Figure 5 and Fig. 9 As shown, the intersection lines of the cutting edge of the front-grinding blade 100, the cutting edge of the rear-grinding blade 200, the front-grinding rake face 2311, the first rake face 2312, the second rake face 2313 and the preset section 5 are respectively the front-grinding cutting edge intersection line 261, the rear-grinding cutting edge intersection line 262, the front-grinding rake face intersection line 263, the first rake face intersection line 264 and the second rake face intersection line 265, and the preset section 5 is perpendicular to the positioning side surface 21 corresponding to the rake face 231 and is perpendicular to the axial end face 22.

[0074] like Figure 4 and Figure 5 As shown, the intersection point of the grinding front cutting edge intersection line 261 and the grinding front rake face intersection line 263 is point P, and the angle between the tangent line of the grinding front rake face intersection line 263 at point P and the grinding front cutting edge intersection line 261 is α1, 12°≤α1≤18°. Figure 8 and Fig. 9 As shown, the intersection point of the ground cutting edge intersection line 262 and the first rake face intersection line 264 is point Q, and the angle between the tangent line of the ground cutting edge intersection line 262 at point Q and the ground cutting edge intersection line 262 is α2, 8°≤α2≤25°.

[0075] It should be noted that α1 can select any angle value between 12° and 19°, such as α1 can select any angle among 12°, 13°, 14°, 15°, 16°, 17°, and 18°. α2 can select any angle value between 8° and 25°, such as α2 can select any angle among 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, 20°, 21°, 22°, 23°, 24°, and 25°.

[0076] like Figure 2 As shown, two adjacent cutting edges are smoothly connected by arc edges, and the projection of the arc edges in the plane where the axial end face 22 is located is the arc edge projection, and the curvature radius of the arc edge projection away from the central through hole 27 is R1, 0.8mm≤R1≤1.2mm; Figure 4 , Figure 5 , Figure 8 and Fig. 9 As shown, the arc curvature of the first rake face intersection line 264 is R2, 0.6 mm≤R2≤1.5 mm, and the arc curvature of the second rake face intersection line 265 is R3, 0.6 mm≤R3≤1.2 mm.

[0077] By limiting α1, R2 and R3, the structural strength of the front cutting face 2311 of the blade 100 before grinding can be ensured, and the chipping of the cutting edge during milling can be avoided. By limiting R1, the chipping resistance of the cutting edge of the blade 100 before grinding and the blade 200 after grinding can be improved. It should be noted that the value of α2 is related to the value of R2.

[0078] It should be noted that R1 can select any value between 0.8mm and 1.2mm, such as R1 can select any value among 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1.0mm, 1.05mm, 1.1mm, 1.15mm, and 1.2mm. R2 can select any value between 0.6mm and 1.5mm, such as R2 can select any value among 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, and 1.5mm. R3 can select any value between 0.6mm and 1.2mm, such as R3 can select any value among 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, and 1.2mm.

[0079] No matter for the blade 100 before grinding or the blade 200 after grinding, 0.8 mm ≤ R1 ≤ 1.2 mm is required.

[0080] Furthermore, if Figure 4 and Figure 5 As shown, for the axial end surface 22 having a third edge connected to the transition arc surface 2314, for the blade 100 before grinding, the distance between the second edge 20 and the third edge along the preset direction is K1, K1 ≥ 1.8 mm. Figure 8 and Fig. 9 As shown, for the blade 200 after grinding, the distance between the second edge 20 and the third edge along the preset direction is K2, K2 ≥ 1.2 mm; the preset direction is parallel to the preset section 5 and perpendicular to the central axis of the central through hole 27.

[0081] Such an arrangement can increase the structural strength of the front cutting edge 2311 of the front blade 100 before grinding, and by limiting the value range of K1, ensure that the size of K2 corresponding to the front cutting edge 2311 obtained after grinding meets the requirements, so that the front cutting edge 231 of the back blade 200 obtained after grinding can still normally remove chips, and at the same time ensure that the structural strength of the front cutting edge 231 of the back blade 200 after grinding meets the requirements.

[0082] It should be noted that K1 can be any value selected from 1.8mm, 1.85mm, 1.9mm, 1.95mm, 2.0mm, 2.05mm, 2.1mm, 2.15mm, 2.2mm, etc. K2 can be any value selected from 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, etc.

[0083] Furthermore, if Figure 5 , Figure 8 and Fig. 9 As shown, the cutting edge of the blade 100 before grinding is recorded as the cutting edge before grinding 2301, and the cutting edge of the blade 200 after grinding is recorded as the cutting edge after grinding 2302. The width of the cutting edge 2301 before grinding along the preset direction is C1; the width of the cutting edge 2302 after grinding along the preset direction is C2; C2≥C1.

[0084] By limiting C2 to be greater than or equal to C1, it can be ensured that the structural strength of the cutting edge 2302 after grinding meets the requirements.

[0085] Furthermore, if Figure 1 , Figure 4 and Figure 5 As shown, for the blade 100 before grinding, the angle between the grinding front and rear cutting edges 2321 and the corresponding grinding front cutting edge 2311 is γ1, γ1 = 90° - β1 - α1. The value range of the angle γ1 is associated with the angle β1 and the angle α1. γ1 is usually called the blade wedge angle. The smaller the blade wedge angle, the sharper the blade. Compared with ordinary double-sided negative blades, the blade is sharper as a whole due to the existence of the angle β1. Therefore, the blade 100 before grinding is particularly suitable for semi-finishing to finishing milling.

[0086] like Figure 6 , Figure 8 and Fig. 9 As shown, the angle between the tangent line at the position where the first rake face 2312 and the ground cutting edge 2302 meet and the ground rake face 2322 is γ2, γ2=90°+β2-α2, γ2>γ1.

[0087] The value range of the angle γ2 is associated with the angle β2 and the angle α2. By limiting γ2>γ1, the blade 200 after grinding can be blunter as a whole compared to the ordinary double-sided negative blade due to the existence of the angle β1. Therefore, the blade 200 after grinding is particularly suitable for rough milling to semi-finishing milling processing.

[0088] Furthermore, if Figure 1 As shown, the plurality of cutting units are arranged rotationally symmetrically along the circumference of the central through hole 27. For example, the entire milling insert 2 is octagonal, and the eight cutting edges at one axial end of the milling insert 2 have the same structure. One cutting edge is used each time, which can improve the service life and cost performance of the milling insert 2.

[0089] Furthermore, the blade 100 before grinding is symmetrically arranged about the preset symmetry plane 4, and the preset symmetry plane 4 is parallel to the axial end face 22 and perpendicular to the central axis of the central through hole 27. Such an arrangement can increase the number of cutting edges to improve the service life and cost performance of the milling blade 2, and at the same time can ensure that the cutting effect is consistent when the cutting edge at either axial end of the milling blade 2 is used.

[0090] like Fig.10 As shown, the present invention further provides a tool, including a cutter disc 1 and the above-mentioned milling blade 2, wherein the milling blade 2 is mounted on the cutter disc 1; a plurality of milling blades 2 are provided, and the plurality of milling blades 2 are spaced apart along the circumference of the cutter disc 1.

[0091] Exemplarily, the milling blade 2 is mounted on the cutter head 1 by means of the fastening screws 3, and the assembly and disassembly of the milling blade 2 is convenient and quick.

[0092] Furthermore, if Fig.10 As shown, the projection of the cutting edge in the preset projection plane is the main edge projection, the preset projection plane is parallel to the central axis of the cutter disc 1 and perpendicular to the central axis of the central through hole 27 on the milling blade 2 where the cutting edge is located; the angle between the main edge projection and the preset plane is Kr, 42°≤Kr≤45°, and the preset plane is perpendicular to the central axis of the cutter disc 1.

[0093] Kr is the main deflection angle. By ensuring that the main deflection angles Kr of the blade 200 after grinding and the blade 100 before grinding remain unchanged, the milling blade 2 can be applied to general surface processing.

[0094] It should be noted that Kr can adopt any angle value between 42° and 45°, such as Kr can be any angle of 42°, 42.5°, 43°, 43.5°, 44°, 44.5° and 45°.

[0095] After the front blade 100 is used for a period of time, the front rake face 2311 and the front and rear cutting faces 2321 are worn. The front rake face 2311 and the front and rear cutting faces 2321 can be ground to remove the worn parts. The front rake face 2311 is ground off, and the second rake face 2313 is used as the rake face of the rear blade 200 after grinding, and the axial end face 22 remains unchanged; while the front and rear cutting faces 2321 are ground off, and the positioning side face 21 remains unchanged, so that the rear blade 200 after grinding can still be installed on the cutter disc 1 and continue to be used.

[0096] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A milling insert, characterized in that: The invention comprises a ground blade (200) provided with a central through hole (27), and a to-be-ground portion (300) integrally formed on the ground blade (200) to form a front-ground blade (100), wherein the ground blade (200) comprises a plurality of positioning side surfaces (21) sequentially arranged along the circumference of the central through hole (27), and two axial end surfaces (22) arranged opposite to each other along the axial direction of the central through hole (27); The sharpened blade (200) and the portion to be sharpened (300) both include a plurality of cutting units corresponding one to one with the positioning side surface (21), the cutting units including a rake face (231), a cutting edge and a flank face, the cutting edge being formed by connecting one side of the rake face (231) and one side of the flank face, the other side of the rake face (231) being connected to the axial end face (22), and the other side of the flank face being connected to the positioning side surface (21).

2. The milling insert according to claim 1, characterized in that For the front blade (100) being ground, the maximum length of the back blade surface along the axial direction of the central through hole (27) is H1, 0.8 mm ≤ H1 ≤ 1.5 mm; For the blade (200) after grinding, the maximum length of the back cutting surface along the axial direction of the central through hole (27) is H2, and H2≥H1.

3. The milling insert according to claim 1, characterized in that For the front blade (100) being sharpened, the angle between the positioning side surface (21) and the back cutting surface connected thereto is β1, 7°≤β1≤15°; For the blade (200) after grinding, the angle between the positioning side surface (21) and the back cutting surface connected thereto is β2, 5°≤β2≤15°.

4. The milling insert according to claim 3, characterized in that The front cutting surface (231) of the front blade (100) before grinding is recorded as the front cutting surface (2311) before grinding; for the back blade (200), the front cutting surface (231) includes a first front cutting surface (2312) and a second front cutting surface (2313), one side of the first front cutting surface (2312) is smoothly connected to the cutting edge, and the other side is smoothly connected to the second front cutting surface (2313), and the second front cutting surface (2313) is smoothly connected to the axial end surface (22) through a transition arc surface (2314); The cutting edge is a plane and is perpendicular to the central axis of the central through hole (27); the front cutting edge (2311) before grinding is an inclined plane; the first front cutting edge (2312) is a circular arc convex surface; and the second front cutting edge (2313) is a circular arc concave surface.

5. The milling insert according to claim 4, characterized in that The intersection lines of the cutting edge of the front-grinding blade (100), the cutting edge of the rear-grinding blade (200), the front-grinding rake face (2311), the first rake face (2312), the second rake face (2313) and the preset cross section (5) are respectively the front-grinding cutting edge intersection line (261), the rear-grinding cutting edge intersection line (262), the front-grinding rake face intersection line (263), the first rake face intersection line (264) and the second rake face intersection line (265), and the preset cross section (5) is perpendicular to the positioning side surface (21) corresponding to the rake face (231) and perpendicular to the axial end surface (22); The intersection point of the grinding front cutting edge intersection line (261) and the grinding front rake face intersection line (263) is point P, and the angle between the tangent line of the grinding front rake face intersection line (263) at point P and the grinding front cutting edge intersection line (261) is α1, 12°≤α1≤18°; The intersection point of the ground cutting edge intersection line (262) and the first rake face intersection line (264) is point Q, and the angle between the tangent line of the ground cutting edge intersection line (262) at point Q and the ground cutting edge intersection line (262) is α2, 8°≤α2≤25°; Two adjacent cutting edges are smoothly connected by a circular arc edge, the projection of the circular arc edge in the plane where the axial end surface (22) is located is the circular arc edge projection, and the curvature radius of the edge of the circular arc edge projection away from the central through hole (27) is R1, 0.8mm≤R1≤1.2mm; The arc curvature of the first rake face intersection line (264) is R2, 0.6 mm≤R2≤1.5 mm; The arc curvature of the second rake face intersection line (265) is R3, 0.6 mm≤R3≤1.2 mm.

6. The milling insert according to claim 5, characterized in that The back cutting surface has a first edge (10) connected to the positioning side surface (21), and a second edge (20) connected to the cutting edge; The axial end surface (22) has a third edge connected to the transition arc surface (2314), and for the blade (100) before grinding, the distance between the second edge (20) and the third edge along a preset direction is K1, and K1 is ≥ 1.8 mm; For the blade (200) after grinding, the distance between the second edge (20) and the third edge along a preset direction is K2, and K2 is ≥ 1.2 mm; The preset direction is parallel to the preset cross section (5) and perpendicular to the central axis of the central through hole (27).

7. The milling insert according to claim 6, characterized in that For the blade (100) before grinding, the width of the cutting edge along the preset direction is C1; for the blade (200) after grinding, the width of the cutting edge along the preset direction is C2; C2≥C1.

8. The milling insert according to claim 4, characterized in that For the front blade (100) before grinding, the angle between the back cutting edge and the corresponding front cutting edge (2311) before grinding is γ1, γ1 = 90° - β1 - α1; For the repaired blade (200), the angle between the tangent line at the position where the first front cutting surface (2312) and the cutting edge meet and the back cutting surface is γ2, γ2=90°+β2-α2, γ2>γ1.

9. The milling insert according to any one of claims 1 to 8, characterized in that The plurality of cutting units are arranged rotationally symmetrically along the circumference of the central through hole (27); And / or, the pre-grinding blade (100) is symmetrically arranged with respect to a preset symmetry plane (4), and the preset symmetry plane (4) is parallel to the axial end face (22) and perpendicular to the central axis of the central through hole (27).

10. A tool, characterized in that It comprises a cutter disc (1) and a milling blade (2) according to any one of claims 1 to 9, wherein the milling blade (2) is mounted on the cutter disc (1); a plurality of the milling blades (2) are provided, and the plurality of the milling blades (2) are arranged at intervals along the circumference of the cutter disc (1); The projection of the cutting edge in a preset projection plane is a main edge projection, and the preset projection plane is parallel to the central axis of the cutter disc (1) and perpendicular to the central axis of the central through hole (27) on the milling blade (2) where the cutting edge is located; The angle between the main blade projection and the preset plane is Kr, 42°≤Kr≤45°, and the preset plane is perpendicular to the central axis of the cutter disc (1).

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