Milling blade

Abstract

The utility model discloses a milling blade which comprises a blade body, the blade body comprises a first end face, a second end face, a long circumferential side face and a short circumferential side face, one end of the blade body is a working end, the other end of the blade body is a non-working end, and the working end is provided with a front blade face, a corner cutting edge and a main cutting edge. A chip containing groove is formed in the front tool face, and the front tool face extends outwards at a preset angle and intersects with the short circumferential side face to form a main cutting edge and a plurality of corner cutting edges; the main cutting edge is connected with the auxiliary cutting edge through an arc; the front cutter surface comprises a first front cutter surface and a second front cutter surface, and the first front cutter surface and the second front cutter surface are mutually inclined; the first rake face, the second rake face and the chip pocket are sequentially connected along the center direction of the blade main body; and the groove-shaped section direction of the chip flute is consistent with the stress direction of the main cutting edge. The utility model provides a milling blade which stabilizes the groove shape and has positive effects on reducing cutting vibration and stabilizing the cutting flow direction.

Description

TECHNICAL FIELD

[0001] The utility model belongs to milling tool technical field, especially, relate to a milling blade. BACKGROUND

[0002] High feed milling cutter is a typical high efficiency cutting tool, in the continuous cutting process, affected by cutting vibration and impact, affect the processing quality, increase the risk of milling blade failure. The existing cutting tool has been pursuing to improve the processing efficiency, usually increase the strength of the tool in structure, reduce the cutting force suffered by the tool, from these two aspects constantly optimize and improve. But the prior art is easy to cause cutting stress to increase, cause tool vibration, increase tool wear.

[0003] The patent with the patent publication number CN102458741A discloses a cutting blade and blade tip replaceable cutting tool, the first inclined part (the front rake face) of the cutting blade provided by the patent is composed of a front inclined surface a and a concave curved surface b, the inclined surface a of the first inclined part is a flat inclined surface that is inclined to the inside of the cutting blade at a specified angle through the main cutting edge, the second corner edge and the second auxiliary cutting edge;The inclined surface is formed in a way that gradually retreats in the thickness direction as it moves away from the main cutting edge, the second corner edge and the second auxiliary cutting edge, that is, in a way that is close to the middle surface;The second inclined part is an inclined surface that stands up to the flat surface at a specified angle from the bottom, the second inclined part gradually bulges to the outside in the thickness direction of the cutting blade as it moves away from the flat surface.

[0004] The above-mentioned patent clearly describes the formation of the front rake face, that is, the inclined part of the front rake face is composed of the main cutting edge, the corner edge and the auxiliary cutting edge, which is inclined and extended at a specified angle. This means that the front rake face is not a single straight face, but a composite face composed of multiple curved surfaces or curved surfaces and straight surfaces. This may cause the overall stress of the blade to be unstable during processing, thereby causing cutting vibration, affecting processing quality, increasing the risk of cutting blade failure, and also making it difficult to control the flow direction of the chips. UTILITY MODEL CONTENTS

[0005] The utility model mainly aims at the problem that the blade cutting processing in the prior art is affected by cutting vibration and impact, affecting the quality of blade processing, and increasing the failure of milling blade, and provides a milling blade.

[0006] In view of the above technical problems, the technical scheme of the utility model is as follows:

[0007] A milling blade, comprising a blade body, the blade body comprising a first end face, a second end face, a long peripheral side and a short peripheral side, one end of the blade body being a working end and the other end being a non-working end, the working end being provided with a front rake face, a corner cutting edge and a main cutting edge.

[0008] The rake face is provided with a chip pocket, the rake face extends outwardly at a preset angle to intersect with the short peripheral surface to form a main cutting edge and a plurality of corner cutting edges; the main cutting edge is connected with a secondary cutting edge through a circular arc; the rake face comprises a first rake face and a second rake face, the first rake face and the second rake face are inclined to each other; the first rake face, the second rake face and the chip pocket are sequentially connected along the center direction of the blade body; the chip pocket is in the same direction as the stress direction of the main cutting edge.

[0009] Further, the blade body is a double-sided four-edge structure; the blade body center is provided with a blade positioning hole, and the contour projection of the blade body is a hexagon.

[0010] Further, the first end face and the second end face are each provided with a positioning face, the main cutting edge is parallel to and higher than the positioning face.

[0011] Further, the highest point of the corner cutting edge is collinear with the main cutting edge, and the secondary cutting edge extends towards the positioning face and ends below the positioning face.

[0012] Further, the length of the corner cutting edge and the main cutting edge is two-thirds of the width of the blade.

[0013] Further, the main cutting edge and the secondary cutting edge are both straight lines, the included angle between the main cutting edge and the secondary cutting edge is an acute angle, and the main cutting edge and the secondary cutting edge are connected through a circular arc transition.

[0014] Further, it further comprises a first rake angle and a second rake angle, the angle of the first rake angle is 15°-20°, and the angle of the second rake angle is 25°-30°.

[0015] Further, the blade of the secondary cutting edge extends along one end of the long peripheral surface, and the main cutting edge, the secondary cutting edge and the corner cutting edge are concentrated on one side of the short peripheral surface.

[0016] Further, the main cutting edge is provided with a blade at the joint with the first rake face, and the width of the blade is 0.1-0.25mm.

[0017] Further, the first rake face and the second rake face are both planes.

[0018] Compared with the prior art, the utility model has the beneficial effects as follows:

[0019] The milling insert of the present application comprises an insert body, the insert body comprising a first end face, a second end face, a long peripheral side face and a short peripheral side face, one end of the insert body being a working end and the other end being a non-working end, the working end being provided with a rake face, corner cutting edges and a main cutting edge; the rake face is provided with a chip pocket, the rake face extends outwardly at a preset angle to intersect with the short peripheral side face to form the main cutting edge and a plurality of corner cutting edges; the main cutting edge is connected with a sub cutting edge through a circular arc; the rake face comprises a first rake face and a second rake face, the first rake face and the second rake face are inclined to each other; the first rake face, the second rake face and the chip pocket are sequentially connected along the central direction of the insert body; the direction of the cross section of the chip pocket is consistent with the stress direction of the main cutting edge, and the cross section size perpendicular to the main offset angle is the same, which has a positive effect on the flow direction of cutting and has a positive effect on stabilizing the cutting flow direction; it is also conducive to the uniform distribution of cutting load, reduces cutting vibration, improves surface quality and prolongs the service life of the insert. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of a milling insert;

[0021] Figure 2 It is a top view of a milling insert;

[0022] Figure 3 It is a side view of a milling insert;

[0023] Figure 4 It is an E-E sectional view of a milling insert;

[0024] Figure 5 It is a local schematic diagram of a cutting edge of a milling insert;

[0025] Figure 6 It is a sectional view of a milling insert;

[0026] Figure 7 It is the stress direction of the main cutting edge of a milling insert and the direction of the insert pocket.

[0027] In the above drawings, 10. insert body; 20. corner cutting edge; 21. main cutting edge; 22. circular arc; 23. sub cutting edge; 24. sub tool tip; 30. edge band; 31. rake face; 31a. first rake face; 31b. second rake face; 32. circular arc groove; 33. intersection line; 34. sub cutting edge rake face; 40. first end face; 41. second end face; 42. long peripheral side face; 45. clearance face; 46. circular arc face; 47. short peripheral side face; 50. insert positioning hole; L1. first rake angle width; L2. second rake angle width; a. first rake angle; b. second rake angle. DETAILED DESCRIPTION

[0028] In order to clearly illustrate the technical features of the application, the following will describe the application in detail with specific embodiments, and with reference to the drawings.

[0029] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the application. However, the application can be practiced without the specific details. In other instances, well-known methods have not been described in detail in order not to unnecessarily obscure aspects of the application.

[0030] In addition, in the description of the application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second", are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0031] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection, or communication; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. In the description of the specification, the description of the terms; "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0033] Example 1

[0034] As Figures 1 to 6 shown, a milling insert includes an insert body 10, the insert body 10 includes a first end surface 40, a second end surface 41, a long peripheral side surface 42 and a short peripheral side surface 47, one end of the insert body 10 is a working end, the other end is a non-working end, the working end is provided with a rake surface 31, an angular cutting edge 20 and a main cutting edge 21;

[0035] The rake surface 31 is provided with a chip pocket, the rake surface 31 extends outward at a preset angle and intersects with the short peripheral side surface 47 to form the main cutting edge 21 and a plurality of angular cutting edges 20; the main cutting edge 21 is connected with a sub-cutting edge 23 through a circular arc 22; the rake surface 31 includes a first rake surface 31a and a second rake surface 31b, the first rake surface 31a and the second rake surface 31b are inclined to each other; the first rake surface 31a, the second rake surface 31b and the chip pocket are connected in sequence along the central direction of the insert body 10; as Figure 7 shown, F1 is the force direction of the main cutting edge 21, F2 is the direction of the chip pocket, the cross-sectional direction of the chip pocket is consistent with the force direction of the main cutting edge 21, that is, the direction of the chip pocket is parallel to the main cutting edge 21.

[0036] In this embodiment, the two positioning surfaces on the first end surface 40 and the second end surface 41 are parallel and perpendicular to the central axis and the peripheral side surface of the insert body 10, the geometric center of the insert body 10 is provided with an insert positioning hole 50, the insert positioning hole 50 penetrates the flat positioning surface area provided on the first end surface and the flat positioning surface area provided on the second end surface. The main cutting edge 21 is parallel to and higher than the positioning surface, the highest point of the angular cutting edge 20 is collinear with the main cutting edge 21, the sub-cutting edge 23 extends towards the positioning surface and ends below the positioning surface. The main cutting edge 21, the angular cutting edge 20, the sub-cutting edge 23 and the rake surface 31 on the same surface are all center-symmetric. The main cutting edge 21 and the sub-cutting edge 23 are straight lines, the included angle between the main cutting edge 21 and the sub-cutting edge 23 is an acute angle, and the specific angle is 32°, which can ensure the cutting precision and processing efficiency, and the main cutting edge 21 and the sub-cutting edge 23 are connected through the circular arc 22, which is not easy to damage the workpiece.

[0037] The corner cutting edge 20 and the main cutting edge 21 are approximately two-thirds the length of the short circumferential side. The cutting edges of the corner cutting edge 20 and the main cutting edge 21 extend along the direction of the secondary cutting edge 23 to the edge of the long circumferential side. The cutting edge 30 of the secondary cutting edge 23 extends a certain distance along one end of the long circumferential side. Under machining conditions such as ramp milling and helical milling, they can still maintain a good cutting state, thus better realizing ramp milling and helical milling. The main cutting edge 21, the secondary cutting edge 23, and the corner cutting edge 20 are all concentrated on one side of the short circumferential side 47. The rake face 31 includes a first rake face 31a and a second rake face 31b. The first rake face 31a and the second rake face 31b are inclined to each other. More precisely, the rake face 31 is composed of two single surfaces at different angles, or it can be a combination of curved surfaces or multiple curved surfaces and planes. This structure results in a more balanced stress distribution.

[0038] In this embodiment, the blade body 10 has a double-sided four-blade structure. When the blade body 10 is assembled and installed with the cutter head, and the cutter head is positioned above the blade, the clearance surface 45 is in a clearance state, and the other end of the short-circuit side surface 47 serves as a positioning surface.

[0039] Example 2

[0040] like Figures 1 to 6 As shown, in this embodiment, the outline projection of the blade body 10 is hexagonal; the long side surface 42 is defined in the long direction of the outline, and the short side surface 47 is defined in the short direction. A clearance surface 45 is defined on the short side surface 47 near the blade tip, and a short side positioning surface 47 is defined near the secondary blade tip 24. The short side cutting edge is distributed at a certain angle by the clearance surface 45 and the short positioning surface with the axis C as the line of symmetry. The short side cutting edge is the cutting edge located on the short side surface 47. Specifically, the angle range can be set to 140° to 160°. Under the condition of balancing the effective depth of cut and the principal cutting edge angle, the angle can be set to 150°. The angle joint is connected by an arc surface 46. To ensure the strength of the arc surface 46, the arc size can be set to the range of R5 to R8, with R6 being the optimal arc radius.

[0041] The groove shape of the insert body 10 consists of two uniform rake faces 31 formed by two different rake angles. Specifically, the rake face 31 has an arc-shaped groove 32, i.e., a chip groove, in the flat area near the positioning surface and 0.1 to 0.2 mm below the flat surface. If this range is too small, it may change the chip shape; if it is too large, it may cause the cutting flow direction to become uncontrollable. Specifically, the inclined surface connecting the arc-shaped groove 32 intersects the flat surface to form an intersection line 33, such as... Figure 1As shown, the intersecting line 33 is at a 15° angle to the axis A, passes through the two positioning surfaces, and is parallel to the clearance surface 45 where the main cutting edge 21 is located. The perpendicular distance between the intersecting line 33 and the axis B of the insert positioning hole on the same plane is 0.25 to 0.45 mm. This range ensures an effective groove depth when the rake angle is determined. In addition, it ensures that the contact surface between the flat positioning surface and the tool groove is not too small. Otherwise, the sharpness of the insert will deteriorate, the cutting performance of the insert will weaken, or the positioning will not be stable, causing cutting vibration. Specifically, the cross-section of the groove is perpendicular to the intersecting line 33 and extends to the circumferential surface with the intersecting line 33 as the vector direction. Thus, the uniform rake face 31 is completely formed.

[0042] The groove direction of the rake face 31 is completely consistent with the force direction of the principal cutting edge angle. The cross-sectional dimensions of each section perpendicular to the principal cutting edge angle are the same. This structure has a positive effect on the flow of chips and is also conducive to the uniform distribution of cutting load. At the same time, it reduces cutting vibration and improves the service life of the insert. By optimizing the groove shape, the cutting force is optimized and evenly distributed, and the insert body 10 can achieve the optimal working state during the machining process.

[0043] Example 3

[0044] like Figures 3 to 6 As shown, in this embodiment, the cross-sectional direction of the rake face 31 intersects with the short-circuit side surface 47 to naturally form a corner cutting edge 20 and a main cutting edge 21. Specifically, the rake face 31 is composed of a first rake face 31a and a second rake face 31b. The first rake angle α of the first rake face 31a, which is closer to the main cutting edge 21, ranges from 15° to 20°. The second rake angle β of the second rake face 31b, which is closer to the flat surface of the positioning surface, ranges from 20° to 25°, and α < β. The distance of the first rake angle α must be greater than the distance of the second rake angle β. This method can better balance the sharpness and strength of the insert body 10. Looking directly at the short-circuit side surface 47, the main cutting edge 21 and the first rake face 31a intersect with the short-circuit side surface 47 to form a corner cutting edge 20 and a main cutting edge 21. The flat surface of the end face 40 is parallel, and the main cutting edge 21 is inclined at a certain angle towards the positioning surface. The secondary cutting edge 23 and the rake face 31 are smoothly transitioned through the curved surface to form the secondary tip 24. This area participates in the important work of ramp milling and helical milling. The point where the main cutting edge 21 and the first rake face 31a meet is set as a flat cutting edge 30. The preferred value range of the cutting edge 30 is 0.1 to 0.025 mm. Alternatively, a combination of flat cutting edge 30 and negative chamfer can be selected according to complex working conditions. The cutting edge 30 extends from the starting point of the meeting point to the position of the secondary tip 24.

[0045] In this embodiment, the blade body 10 is made of cemented carbide powder, but it can also be made of other materials.

[0046] Obviously, the above-described embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, on the basis of the above-described description, other different forms of changes or variations can also be made. Here, it is not necessary and also impossible to exhaust all the implementation modes. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A milling insert, characterized by The cutting blade body comprises a first end face, a second end face, a long circumferential side face and a short circumferential side face, one end of the cutting blade body is a working end, and the other end is a non-working end, the working end is provided with a rake face, corner cutting edges and a main cutting edge; The rake face is provided with a chip groove, the rake face extends outward at a preset angle to intersect with the short circumferential side face to form the main cutting edge and a plurality of corner cutting edges, the main cutting edge is connected with a sub-cutting edge through a circular arc, the rake face comprises a first rake face and a second rake face, the first rake face and the second rake face are inclined to each other, the first rake face, the second rake face and the chip groove are sequentially connected along the central direction of the cutting blade body, and the groove type cross section direction of the chip groove is consistent with the stress direction of the main cutting edge.

2. A milling insert according to claim 1, characterized in that The cutting blade body is a double-sided four-edge structure, the cutting blade body is provided with a cutting blade positioning hole at the center, and the contour projection of the cutting blade body is a hexagon.

3. A milling insert according to claim 1, characterized in that The first end face and the second end face are each provided with a positioning face, the main cutting edge is parallel to the positioning face and is higher than the positioning face.

4. The milling insert according to claim 1, wherein, The highest point of the corner cutting edge is collinear with the main cutting edge, the sub-cutting edge extends towards the positioning face and ends at a position lower than the positioning face.

5. A milling insert according to claim 4, characterized in that The length of the corner cutting edge and the main cutting edge is two-thirds of the width of the cutting blade.

6. A milling insert according to claim 1, characterized in that The first rake face and the second rake face are further included, the angle of the first rake face is 15°-20°, and the angle of the second rake face is 25°-30°.

7. The milling insert according to claim 1, wherein The main cutting edge and the sub-cutting edge are both straight lines, and the included angle between the main cutting edge and the sub-cutting edge is an acute angle.

8. A milling insert according to claim 7, characterized in that The edge band of the sub-cutting edge extends along one end of the long circumferential side face, the main cutting edge, the sub-cutting edge and the corner cutting edge are concentrated on one side of the short circumferential side face.

9. The milling insert according to claim 1, wherein, The main cutting edge is provided with an edge band at the joint with the first rake face, and the width of the edge band ranges from 0.1 mm to 0.25 mm.

10. The milling insert according to claim 1, wherein, The first rake face and the second rake face are both planes.

Images