CN214349875U - Indexable cutting insert for milling cutter and milling cutter - Google Patents

Abstract

The utility model discloses an indexable cutting insert for milling cutter, include: the cutting tool comprises a top surface, a bottom surface opposite to the top surface, a side clearance surface positioned between the top surface and the bottom surface, a clamping hole penetrating through the top surface and the bottom surface, two end tips, and a first cutting edge and a second cutting edge formed by the intersection of the top surface and the side clearance surface; the first cutting edge and the second cutting edge are provided with arc-shaped parts with different lengths and basically straight line parts connected with the arc-shaped parts with different lengths; the cutting insert is asymmetrical about the axis of the clamping hole; the bottom surface is provided with at least two grooves which are positioned at two sides of the clamping hole and have the same distance with the clamping hole. A milling cutter using the cutting insert is also disclosed. The utility model aims at providing a cutting blade, this cutting blade can the accurate positioning, can firmly be pressed from both sides tightly when using, can not rotate on the blade groove because of reaction force, but also can prevent that the blade clamping fashion is anti-.

Description

Indexable cutting insert for milling cutter and milling cutter

Technical Field

The utility model belongs to the machining field especially relates to an indexable cutting insert and milling cutter for milling cutter.

Background

In the indexable ball nose end mill, the cutting insert is fixedly mounted on the cutter body by a screw or the like, so that the cutting insert can stably perform a cutting task. In this case, since the screw has only a vertical clamping force on the insert, it is not sufficient to support the reaction force caused by the cutting force. In particular, in a cutting insert of a ball nose end mill having a circular arc-shaped cutting edge for cutting a curved surface, the insert is rotated about a screw by a reaction force caused by a cutting force. That is, there is a problem in that the cutting insert cannot be fixedly mounted on the cutter body only by using a screw.

Ball nose end mills are used in complex and severe operating conditions with cutting forces that are highly chattering and require high demands with regard to machining accuracy. If indexable cutting inserts are used in ball nose end mills, it is critical that such indexable cutting inserts be accurately positioned with respect to the cutter body and that the cutting inserts be securely clamped on the cutter body.

Conventional tools for contour milling, which tools comprise conventional indexable milling inserts for contour milling cutters or end milling cutters. The fixation of the milling insert is mainly ensured by the tightening force from the tightening screw and the cooperation between the clearance surface of the milling insert and the side support surface of the insert pocket. This would subject the fastening screw to large forces and risk instability of the fixation.

One of the prior art milling tools and milling inserts is the contact between the bottom side of the milling insert and the bottom surface of the insert pocket, between parts of the clearance surface of the milling insert and side support surfaces of the insert pocket, and between the recess of the milling insert and the protrusion of the insert pocket. The abutment becomes over-determined, i.e. there is no precise positioning of the cutting edge in relation to the cutter body and, in the worst case, the milling insert will oscillate in the insert pocket.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide a cutting insert that is precisely positionable, securely clamped in use, does not rotate on an insert pocket due to reaction forces, and is also resistant to reverse assembly when the insert is clamped.

This patent scheme provides an indexable cutting insert for milling cutter, includes: a top surface, a bottom surface opposite the top surface, a side clearance surface between the top and bottom surfaces, a clamping hole passing through the top and bottom surfaces, two end tips, and a first cutting edge and a second cutting edge formed by the intersection of the top surface and the side clearance surface; the first cutting edge and the second cutting edge are provided with arc-shaped parts with different lengths and straight line parts with different lengths, which are connected with the arc-shaped parts.

Further, the side clearance face is not perpendicular to a bottom plane defined by the bottom face.

Further, said first cutting edge has said arcuate portion longer than said second cutting edge, and said second cutting edge has said linear portion longer than said first cutting edge.

Further, the indexable cutting insert is asymmetric about an axis of the clamping hole; the bottom surface is provided with at least two grooves, and the grooves are located on two sides of the clamping hole and have the same distance with the clamping hole.

Further, the groove is located on the side of the bottom surface opposite to the arc-shaped portion. The groove is disposed proximate the tip end.

Furthermore, the groove is a long-strip-shaped groove extending towards the clamping hole, or a right-angle-shaped groove extending towards the clamping hole from a right-angle side.

There is also provided a milling cutter with indexable cutting inserts, comprising: the cutting insert comprises a cutter handle, a cutting end positioned at one end of the cutter handle, a fastening piece and the cutting insert in any one of the technical schemes; the cutting end is provided with an insert mounting groove, and the fastener fixes the cutting insert relative to the insert mounting groove through a clamping hole of the cutting insert; and the bottom of the blade mounting groove is provided with a bulge matched with the groove of the cutting blade.

Further, the inclination angle of the insert mounting pocket side wall matches the inclination angle of the side clearance face of the cutting insert.

Further, a side clearance face of the cutting insert is brought into contact with the insert mounting pocket side wall.

Furthermore, the cutting end is respectively provided with one blade mounting groove along two sides of the axis of the milling cutter, and the two blade mounting grooves are 180-degree symmetrical relative to the axis.

The improvement of this patent brings the following advantage:

(1) the present solution provides contact between the clearance surface of the cutting insert and the side support surface of the insert pocket, thereby ensuring accurate positioning of the cutting edge relative to the cutter body. The cutting insert can be firmly clamped, and thus the cutting insert is prevented from rotating on the insert pocket due to a reaction force caused by the cutting force.

(2) The cutting blade has better installation stability when being matched and positioned with the groove, and effectively prevents the blade from vibrating.

(3) Due to the asymmetry of the blade, the groove at the bottom of the blade needs to be matched with the bulge on the blade groove of the cutter body, so that the blade is prevented from being reversely mounted during clamping.

(4) Contact is made between the recess of the cutting insert and the projection of the insert pocket, the side of which abuts the recess only when the cutting insert is allowed to move slightly under a certain load during machining. The abutment is avoided becoming over-determined.

Drawings

Fig. 1 is a perspective view of an indexable cutting insert for a milling cutter according to an embodiment of the present application;

fig. 2 is a front view of an indexable cutting insert for a milling cutter according to an embodiment of the present application;

fig. 3 is a schematic bottom view of an indexable cutting insert for a milling cutter according to an embodiment of the present application;

fig. 4 is a rear view of an indexable cutting insert for a milling cutter according to an embodiment of the present application;

fig. 5 is an exploded perspective view of a milling cutter having indexable cutting inserts according to an embodiment of the present application;

fig. 6 is a rear view of an indexable cutting insert for a milling cutter according to another embodiment of the present application;

wherein 1 is a top surface, 2 is a bottom surface, 3 is a side clearance surface, 4 is a clamping hole, 5 is an end tip, 6 is a first cutting edge, 61 is an arc-shaped portion of the first cutting edge, 62 is a straight line portion of the first cutting edge, 7 is a second cutting edge, 71 is an arc-shaped portion of the first cutting edge, 72 is a straight line portion of the second cutting edge, 8 is a groove, 100 is a shank, 200 is an insert mounting groove, 201 is a protrusion, 300 is a fastener, and 400 is a cutting insert.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

Referring to fig. 1 to 4, embodiment 1 of the present application discloses an indexable cutting insert for a milling cutter, including:

a top surface 1, a bottom surface 2, a side clearance surface 3, a clamping hole 4, two end tips 5, a first cutting edge 6 and a second cutting edge 7; the bottom surface 2 is substantially flat and disposed opposite the top surface 1 at the upper and lower ends of the cutting insert 400; a side clearance face 3 is located between the top face 1 and the bottom face 2 as a side face of the cutting insert 400; the first cutting edge 6 and the second cutting edge 7 are positioned at the intersection of the top surface 1 and the side clearance surface 3, and as a main component for the cutting function, the first cutting edge 6 and the second cutting edge 7 are both composed of an arc-shaped part and a substantially straight line part, the arc-shaped part of the first cutting edge 6 and the arc-shaped part of the second cutting edge 7 are different in length, and likewise, the straight line part of the first cutting edge 6 is also different in length from the straight line part of the second cutting edge 7; the two end tips 5 are located at the front and rear ends of the cutting insert 400 and are also transition portions of the first and second cutting edges 7; the clamping hole 4 is located in the middle of the cutting insert 400, and penetrates through the top surface 1 and the bottom surface 2 from top to bottom to serve as a part of the cutting insert 400 for fixing; the cutting insert 400 is asymmetrical about the axis of the clamping hole 4; at least two grooves 8 are also arranged on the bottom surface 2 and on both sides of the clamping hole 4, and the grooves 8 have the same distance with the clamping hole 4. The cutting insert 400 is preferably made of cemented carbide.

Optionally, the cutting insert is a positive cutting insert 400, i.e. the insert clearance angle is not zero, the cutting insert 400 has inclined side surfaces, or the side clearance surface 3 and a theoretical bottom plane defined by the bottom surface 2 are not perpendicular to each other; the cutting insert 400 is mounted in the insert mounting pocket 200 of the milling cutter, and the side clearance surface 3 of the insert has a slope surface portion to be matched with the insert mounting pocket 200 of the cutter body to make contact, thereby effectively preventing the cutting insert 400 from rotating during the cutting operation.

Optionally, the arcuate portion of the first cutting edge 6 is longer than the arcuate portion of the second cutting edge 7; the straight portion of the first cutting edge 6 is shorter than the straight portion of the second cutting edge 7.

Alternatively, the groove 8 is provided on the side of the bottom surface 2 at a position of the bottom surface 2 opposite to the arc-shaped portions of the first and second cutting edges 7; preferably, the groove 8 is arranged close to the end tip 5; preferably, the recess 8 is elongated or oblong, the recess 8 extending in the direction of the clamping hole 4.

Referring to fig. 6, the present application discloses an indexable cutting insert 400 for a milling cutter in embodiment 2, which is substantially the same as embodiment 1 except that the recess 8 of the cutting insert 400 is a right-angled triangular recess 8, one of the right-angled sides extending in the direction of the clamping hole 4.

Referring to fig. 5, embodiment 3 of the present application is a milling cutter having an indexable cutting insert 400, including a shank 100, a cutting end, a fastener 300, and a cutting insert 400; the cutting end is located at one end of the tool holder 100, and is provided with a blade mounting groove 200, the cutting blade 400 is arranged on the blade mounting groove 200 and then fixed by a fastener 300, and the fastener 300 can be a detachable fixing device in different manners such as a screw, a buckle and the like; the bottom of the insert mounting groove 200 is further provided with a protrusion 201 which is matched with the groove 8 of the cutting insert 400, and the groove 8 and the protrusion 201 are matched with each other to further accurately fix the cutting insert 400 on the insert mounting groove 200; and since the cutting insert 400 is not a symmetrical pattern in a front view, the positions of the recess 8 and the protrusion 201 are uniquely matched, and if the cutting insert 400 is reversely mounted, the situation of non-mounting occurs, which can prevent the problem that an operator mistakenly mounts the cutting insert 400 upside down.

Optionally, the inclination angle of the side wall of the insert mounting groove 200 is matched with the inclination angle of the side clearance surface 3 of the cutting insert 400, and the inclination angles can enable the side wall and the side clearance surface to be tightly attached to each other, so that the mounting accuracy of the cutting insert 400 can be ensured, the adverse conditions of rotation, vibration and the like of the cutting insert 400 in the operation process can be effectively avoided, and the processing accuracy and the processing efficiency are improved.

Alternatively, the insert side chamfer portion is matched to the cutter body insert mounting pocket, i.e., contact is made between the side clearance surface 3 of the cutting insert and the side wall of the insert mounting pocket to ensure that the cutting insert can be accurately positioned.

Alternatively, there are two insert mounting slots 200, which are respectively disposed on both sides of the axis of the milling cutter, and any one of the insert mounting slots 200 is rotated 180 ° with respect to the axis of the milling cutter and then overlapped with the other insert mounting slot 200, i.e., the two insert mounting slots 200 are 180 ° symmetrical with respect to the axis.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. An indexable cutting insert for a milling cutter, comprising: a top surface, a bottom surface opposite the top surface, a side clearance surface between the top and bottom surfaces, a clamping hole passing through the top and bottom surfaces, two end tips, and a first cutting edge and a second cutting edge formed by the intersection of the top surface and the side clearance surface; the first cutting edge and the second cutting edge are provided with arc-shaped parts with different lengths and straight line parts with different lengths, which are connected with the arc-shaped parts.

2. The indexable cutting insert for a milling cutter according to claim 1 wherein the side clearance face is non-perpendicular to a bottom plane defined by the bottom surface.

3. The indexable cutting insert for a milling cutter according to claim 1 wherein the first cutting edge has the arcuate portion longer than the second cutting edge, the second cutting edge having the linear portion longer than the first cutting edge.

4. The indexable cutting insert for a milling cutter according to claim 1, wherein the indexable cutting insert is asymmetric about an axis of the clamping hole; the bottom surface is provided with at least two grooves, and the grooves are located on two sides of the clamping hole and have the same distance with the clamping hole.

5. The indexable cutting insert for a milling cutter according to claim 4 wherein the groove is located on the side of the bottom surface opposite the arcuate portion, the groove being disposed proximate the end tip.

6. An indexable cutting insert for a milling cutter according to claim 5 wherein the recess is an elongated recess extending toward the clamping hole or a right-angled recess having a right-angled edge extending toward the clamping hole.

7. A milling cutter with indexable cutting inserts, comprising: a shank, a cutting end at one end of the shank, a fastener, a cutting insert according to any one of claims 1-6; the cutting end is provided with an insert mounting groove, and the fastener fixes the cutting insert relative to the insert mounting groove through a clamping hole of the cutting insert; and the bottom of the blade mounting groove is provided with a bulge matched with the groove of the cutting blade.

8. The milling cutter with indexable cutting inserts of claim 7 wherein the angle of inclination of the insert mounting pocket side wall matches the angle of inclination of the side clearance face of the cutting insert.

9. The milling cutter with indexable cutting inserts of claim 7 wherein the side clearance surfaces of the cutting inserts are in contact with the insert mounting pocket side walls.

10. A milling cutter with indexable cutting inserts according to claim 7 wherein the cutting end is provided with one of the insert mounting slots on each side of the milling cutter axis, the two insert mounting slots being 180 ° symmetrical with respect to the axis.

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