Polygonal indexable milling blade

Abstract

The utility model belongs to the technical field of machining tools, and relates to a double-sided indexable milling blade, which comprises an upper surface, a lower surface opposite to the upper surface, a peripheral side surface positioned on the periphery of a blade body and perpendicular to the upper surface and the lower surface, and a front blade surface respectively connected with the peripheral side surface, the upper surface and the lower surface of the blade, comprising a main cutting edge, a corner cutting edge and an auxiliary cutting edge, the main cutting edge comprises a first cutting edge, a second cutting edge and a third cutting edge, the first cutting edge and the third cutting edge are linear, and the second cutting edge is a convex arc cutting edge. The improved toughness behavior of the cutting edge can be achieved, the tipping condition is reduced, stable transition is achieved when the cutting edge makes contact with a workpiece, and cutting force is reduced when the cutting edge cuts in, so that more stable machining is achieved under the low noise level, and the surface quality of the workpiece is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical processing tools, in particular to a polygonal indexable milling cutter blade. Background Art

[0002] The metal cutting process is a process of interaction between the workpiece and the tool. The utilization rate of the tool becomes the key. In order to improve efficiency and the utilization rate of the tool, an indexable blade structure design is usually adopted. At the same time, the blade is designed to be better utilized. The blade is designed to be a polygon, that is, each side of the polygon corresponds to a cutting edge. The cutting edge of the blade is designed to be flat or curved on the back face. On the one hand, this will lead to high cutting resistance during the processing, and on the other hand, it is easy to cause the tool to vibrate and break during the processing. In this case, due to the increase in cutting resistance, abnormal vibration (high-frequency vibration) will occur, and there is a problem that it is difficult to finish the surface of the cut material to a satisfactory state. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the main purpose of the utility model is to provide a polygonal indexable milling insert.

[0004] In order to solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0005] A polygonal indexable milling insert, which is a double-sided indexable milling insert, comprises:

[0006] upper surface;

[0007] Lower surface: arranged opposite to the upper surface;

[0008] Peripheral side: located around the blade body, perpendicular to the upper and lower surfaces;

[0009] Rake face: connected to the peripheral side surface, upper surface and lower surface of the blade respectively;

[0010] Cutting edge: The intersection of the front cutting edge and the peripheral side surface is the cutting edge, including the main cutting edge, corner cutting edge, and auxiliary cutting edge; among them: the main cutting edge includes the first cutting edge, the second cutting edge, and the third cutting edge in sequence, the first cutting edge and the third cutting edge are straight lines, and the second cutting edge is a convex arc.

[0011] As a preferred solution of a polygonal indexable milling insert described in the utility model, the angles of the rake faces corresponding to the first cutting edge, the second cutting edge, and the third cutting edge and the peripheral side face are all different, and the angles of the rake faces and the peripheral side face are in the following relationship:

[0012] The angle θ1 between the rake face corresponding to the first cutting edge and the peripheral side surface>the angle θ2 between the rake face corresponding to the second cutting edge and the peripheral side surface>the angle θ3 between the rake face corresponding to the third cutting edge and the peripheral side surface.

[0013] As a preferred solution of the polygonal indexable milling insert described in the utility model, wherein: the angles θ1, θ2, and θ3 are all within the range of 65 to 75°.

[0014] As a preferred solution of the polygonal indexable milling insert described in the utility model, wherein: the first cutting edge of the main cutting edge is parallel to the upper surface and the lower surface, its length is L1, and 0.5mm≤L1≤1mm.

[0015] As a preferred solution of the polygonal indexable milling insert described in the utility model, the second cutting edge of the main cutting edge is in the shape of an outwardly convex arc, the height difference thereof is H1, and 0.03mm≤H1≤0.06mm.

[0016] As a preferred solution of a polygonal indexable milling insert described in the utility model, the third cutting edge of the main cutting edge is straight and inclined downward relative to the first cutting edge, the inclination angle is A, and 3°≤A≤7°; the height difference is H2, and 0.3mm≤H2≤0.5mm.

[0017] As a preferred solution of the polygonal indexable milling insert described in the utility model, the ratio of the projection lengths L1, L2, and L3 of the first cutting edge, the second cutting edge, and the third cutting edge is L1:L2:L3=1:1:(4-5).

[0018] As a preferred solution of the polygonal indexable milling insert described in the utility model, the auxiliary cutting edge is a curved cutting edge, the height difference thereof is H3, and 0.3≤H3≤0.5mm.

[0019] As a preferred solution of the polygonal indexable milling insert described in the utility model, a screw hole is provided at the geometric center of the polygonal indexable milling insert body, penetrating the upper surface and the lower surface.

[0020] The beneficial effects of the utility model are as follows:

[0021] The utility model proposes a polygonal indexable milling insert, which is a double-sided indexable milling insert, including an upper surface, a lower surface arranged opposite to the upper surface, a peripheral side surface located around the blade body and perpendicular to the upper and lower surfaces, a front cutting surface connected to the peripheral side surface and the upper and lower surfaces of the blade respectively, including a main cutting edge, a corner cutting edge, an auxiliary cutting edge, and the main cutting edge includes a first cutting edge, a second cutting edge, and a third cutting edge, the first cutting edge and the third cutting edge are straight lines, and the second cutting edge is an outward convex arc cutting edge. The utility model can achieve improved toughness behavior of the cutting edge, reduce chipping, smoothly transition when contacting the workpiece, reduce cutting force when cutting in, thereby more smoothly processing at a lower noise level, so as to improve the surface quality of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the indexable milling insert of the utility model;

[0024] Figure 2 It is a side view of the indexable turning insert of the utility model;

[0025] Figure 3 This is a three-dimensional view of the front cutting surface of the indexable turning insert of the utility model;

[0026] Figure 4 yes Figure 2 Enlarged view of the D portion of the cutting edge;

[0027] Figure 5 It is a top view of the indexable turning insert of the utility model;

[0028] Figure 6 It is a partial cross-sectional view of the first cutting edge of the indexable turning insert of the utility model corresponding to the rake face along the EE section;

[0029] Figure 7 It is a partial cross-sectional view of the second cutting edge of the indexable turning insert of the utility model corresponding to the rake face along the FF section;

[0030] Figure 8 It is a partial cross-sectional view of the third cutting edge of the indexable turning insert of the utility model corresponding to the rake face along the GG section.

[0031] Among them, 1-upper surface, 2-screw hole, 3-peripheral side, 4-corner cutting edge, 5-main cutting edge, 5.1-first cutting edge, 5.2-second cutting edge, 5.3-third cutting edge, 6-front cutting surface, 6.1-first front cutting surface, 6.2-second front cutting surface, 6.3-third front cutting surface, 7-auxiliary cutting edge, and 8 is a groove.

[0032] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] The utility model provides Figure 1-8 A polygonal indexable milling insert is shown, and the polygonal indexable milling insert is a double-sided indexable milling insert, comprising:

[0035] Upper surface 1;

[0036] Lower surface: arranged opposite to the upper surface 1;

[0037] The peripheral side surface 3 is located around the blade body and is perpendicular to the upper surface 1 and the lower surface;

[0038] Rake face 6: connected to the peripheral side surface 3, upper surface 1 and lower surface of the insert respectively;

[0039] Cutting edge: The intersection of the front cutting surface 6 and the peripheral side surface 3 is the cutting edge, including the main cutting edge 5, the corner cutting edge 4, and the auxiliary cutting edge 7; wherein: the main cutting edge 5 includes the first cutting edge 5.1, the second cutting edge 5.2, and the third cutting edge 5.3 in sequence, the first cutting edge 5.1 and the third cutting edge 5.3 are straight lines, and the second cutting edge 5.2 is an outward convex arc.

[0040] It should be noted that when the blade of the utility model cuts into the workpiece, the cutting edges cut in sequentially. The first to touch the workpiece are the corner cutting edge 4, the first cutting edge 5.1 of the main cutting edge 5, and the part of the auxiliary cutting edge 7 close to the corner cutting edge 4. At this time, in order to prevent the blade tip from chipping, the three should be in the same plane, so that the area of ​​the cutting edge contacting the workpiece can be larger and thus less prone to chipping.

[0041] Specifically, the rake faces 6 corresponding to the first cutting edge 5.1, the second cutting edge 5.2, and the third cutting edge 5.3 (the first cutting edge 5.1 corresponds to the first rake face 6.1, the second cutting edge 5.2 corresponds to the second rake face 6.2, and the third cutting edge 5.3 corresponds to the third rake face 6.3) and the peripheral side surface 3 are all different in angle, and the angle between the rake face 6 and the peripheral side surface 3 is:

[0042] The angle θ1 between the first rake face 6.1 corresponding to the first cutting edge 5.1 and the peripheral side surface 3> the angle θ2 between the second rake face 6.2 corresponding to the second cutting edge 5.2 and the peripheral side surface 3> the angle θ3 between the third rake face 6.3 corresponding to the third cutting edge 5.3 and the peripheral side surface 3. The θ1, θ2, and θ3 are all within the range of 65 to 75°.

[0043] Specifically, the first cutting edge 5.1 of the main cutting edge 5 is parallel to the upper surface 1 and the lower surface, and its length is L1, and 0.5mm≤L1≤1mm. The second cutting edge 5.2 of the main cutting edge 5 is an outward convex arc, and its height difference is H1, and 0.03mm≤H1≤0.06mm. The radius of the outward convex arc structure of the second cutting edge 5.2 is R, and 8mm≤R≤15mm; the third cutting edge 5.3 of the main cutting edge 5 is a straight line and tilted downward relative to the first cutting edge 5.1, the inclination angle is A, and 3°≤A≤7°; its height difference is H2, and 0.3mm≤H2≤0.5mm. The ratio of the projected lengths L1, L2, and L3 of the first cutting edge 5.1, the second cutting edge 5.2, and the third cutting edge 5.3 is L1:L2:L3=1:1:(4~5).

[0044] It should be noted that, due to the straight shape of the first cutting edge 5.1, when the cutting depth is shallow during use, the cutting resistance of the cutting edge is relatively small, and smooth processing can be achieved. When the cutting depth is deep, the second cutting edge 5.2 and the third cutting edge 5.3 are involved in the work. Since the angle of the second cutting edge 5.2 that contacts the workpiece outward gradually increases, it is conducive to a smooth transition and reduces the risk of chipping. Secondly, the edge of the third cutting edge 5.3 is tilted downward relative to the first cutting edge 5.1. In this way, during use, the third cutting edge 5.3 will produce an inclination angle, which is conducive to reducing the cutting resistance, thereby reducing the vibration of the blade, making the processing smoother and the surface processing quality better.

[0045] Specifically, the auxiliary cutting edge 7 is a curved cutting edge, and the height difference thereof is H3, and 0.3≤H3≤0.5 mm.

[0046] Specifically, a screw hole 2 is provided at the geometric center of the polygonal indexable milling insert body, penetrating the upper surface 1 and the lower surface, for fixing the insert.

[0047] Specifically, the rake face 6 is connected to the upper surface 1 or the lower surface through the groove 8. When the blade of the utility model cuts into the workpiece, chips are generated. Since the rake face 6 has a certain angle, the chips can flow into the groove 8 along the angle of the rake face 6, and then flow out of the blade through the groove 8. This is conducive to the flow of chips, and avoids the chips flowing back to the workpiece surface to scratch the workpiece surface and affect the roughness.

[0048] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification under the utility model concept of the utility model, or direct / indirect application in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A polygonal indexable milling insert, characterized in that: The polygonal indexable milling insert is a double-sided indexable milling insert, including: upper surface; Lower surface: arranged opposite to the upper surface; Peripheral side: located around the blade body, perpendicular to the upper and lower surfaces; Rake face: connected to the peripheral side surface, upper surface and lower surface of the blade respectively; Cutting edge: The intersection of the front cutting edge and the peripheral side surface is the cutting edge, including the main cutting edge, corner cutting edge, and auxiliary cutting edge; among them: the main cutting edge includes the first cutting edge, the second cutting edge, and the third cutting edge in sequence, the first cutting edge and the third cutting edge are straight lines, and the second cutting edge is a convex arc.

2. The polygonal indexable milling insert according to claim 1, characterized in that: The included angles between the rake face and the peripheral side surface corresponding to the first cutting edge, the second cutting edge, and the third cutting edge are all different. The included angle between the rake face and the peripheral side surface is as follows: The angle θ1 between the rake face corresponding to the first cutting edge and the peripheral side surface>the angle θ2 between the rake face corresponding to the second cutting edge and the peripheral side surface>the angle θ3 between the rake face corresponding to the third cutting edge and the peripheral side surface.

3. The polygonal indexable milling insert according to claim 2, characterized in that: The θ1, θ2 and θ3 are all within the range of 65 to 75°.

4. The polygonal indexable milling insert according to claim 1, characterized in that: The first cutting edge of the main cutting edge is parallel to the upper surface and the lower surface, has a length L1, and 0.5 mm ≤ L1 ≤ 1 mm.

5. The polygonal indexable milling insert according to claim 1, characterized in that: The second cutting edge of the main cutting edge is in an outwardly convex arc shape, and the height difference thereof is H1, and 0.03mm≤H1≤0.06mm.

6. The polygonal indexable milling insert according to claim 1, characterized in that: The third cutting edge of the main cutting edge is straight and inclined downward relative to the first cutting edge, with an inclination angle of A, and 3°≤A≤7°; its height difference is H2, and 0.3mm≤H2≤0.5mm.

7. The polygonal indexable milling insert according to claim 1, characterized in that: The ratio of the projected lengths L1, L2, and L3 of the first cutting edge, the second cutting edge, and the third cutting edge is L1:L2:L3=1:1:(4-5).

8. The polygonal indexable milling insert according to claim 1, characterized in that: The auxiliary cutting edge is a curved cutting edge, the height difference of which is H3, and 0.3mm≤H3≤0.5mm.

9. The polygonal indexable milling insert according to claim 1, characterized in that: A screw hole is arranged at the geometric center of the polygonal indexable milling insert body and passes through the upper surface and the lower surface.

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