KR20080099471A - Insert for parting and chafering - Google Patents

Abstract

An insert for parting and chamfering is provided to perform paring and chamfering sequentially after being mounted to a tool. An insert for parting and chamfering comprises a divided part(10) cutting a rotating workpiece; and a chamfering part(20) chamfering the workpiece cut by the divided part. A cutting edge(11) is formed in contact with the cut matter in the leading end upper end of the divided part. One part of the chamfering part with wide width is stepped. The front surface of the stepped surface(21A,21B) has a top edge capable of chamfering the edge part of the cut surface of the cut workpiece. The divided part includes the groove formed in the upper side of the tip into the longitudinal direction and the leading end of groove is mating to the cutting edge.

Description

 Insert for parting and chafering

1 is a perspective view of an insert according to the invention.

2 and 3 are side and top views of the insert according to the invention.

4 is a cross-sectional view taken along the line A-A of FIG. 3.

5a and 5b are plan views showing the machining process of the workpiece using the insert according to the present invention.

The present invention relates to a tool, and more particularly to an insert capable of performing cutting and filleting.

In general, cutting tools are used in the field of cutting operations such as drilling, milling and turning. In the field of drilling and milling, tools have the property of rotating and are useful for the machining of fixed and movable work-pieces. On the other hand, the tool used for turning is used for the purpose of machining a workpiece rotating in a fixed state.

For example, in order to manufacture a bearing cap, a cutting process may be performed on a work piece, followed by a chamfering process on an edge portion of the work piece. Therefore, inserts of a particular shape for the dividing process and the fillet process are prepared separately, and the insert is selected and used according to each process.

Generally, the machining tool is assembled by clamping the insert on the mounting surface of the holder using clamping means. Therefore, in order to proceed with the filleting process after the dividing process, the insert for the dividing process must be removed from the holder, and then the insert for the filleting process must be mounted.

There is a problem in that two types of inserts have to be prepared in order to manufacture a single product requiring a dividing process and a fillet process. Also, as described above, since a lot of time is required for inserting and removing the inserts, product productivity is reduced. A problem occurs.

The present invention is to solve the problems occurring in the process of producing a product that is required to cut and fillet processing, to provide an insert that can be carried out in a sequence after the mounting and tooling in a tool The purpose is.

The insert according to the present invention comprises a cutting part for cutting the rotating workpiece; And a fillet having a width wider than the width of the dividing portion and formed at the rear end of the dividing portion to fillet the cut workpiece.

A cutting edge is formed at the top of the distal end of the cutting part in contact with the work to be cut, and at least one side of the fillet is formed stepped, and the stepped surface is a curved surface, and the cutting edge of the cutting cutting the upper edge thereof. We can fillet part.

The dividing portion includes a groove formed in the longitudinal direction on an upper surface of the tip portion, the tip of the groove corresponding to the cutting edge. In addition, the dividing portion includes a protrusion formed at the rear of the groove, and the front surface of the protrusion is formed of an upwardly inclined surface.

 Hereinafter, with reference to the accompanying drawings of the present invention will be described in detail.

1 is a perspective view of the insert according to the present invention, Figures 2 and 3 are a side view and a plan view of the insert according to the present invention, the insert 100 according to the present invention is a process by the powder metallurgy method, that is, the mold pressure, It is a monolith made through the process of sintering, grinding and coating. The insert 100 according to the present invention may be divided into a parting section 10 and a chamfering section 20 of the rear end having substantially the same height.

The configuration and function of each part constituting the insert 100 will be described in detail.

Division 10

The straight portion 10 having a predetermined width and length is a portion for cutting the workpiece, and a cutting edge 11 for cutting in contact with the rotating workpiece is formed at the upper end.

Grooves 12 of a predetermined depth are formed in the upper surface of the tip portion 10 in the longitudinal direction of the dividing portion 10, and the tip portion thereof corresponds to the cutting edge 11. The rear end of the groove portion 12 is provided with a projection 13 having a predetermined height over the entire width of the dividing portion 10. The front surface 13A of the protrusion 13 is formed of an upward inclined surface.

In the structure of the divided part 10, chips generated when the workpiece is processed by the cutting edge 11 are guided along the grooves 12, and the upwardly inclined surface 13A of the protrusion 13 is formed. Move upwards to prevent contact between the chip and the tool holder (not shown). In addition, the chip discharged from the groove 12 is bent in the process of moving along the front inclined surface 13A of the projection 13 is cut into a predetermined length.

Fillet 20

The fillet portion 20 integrally formed at the rear end of the dividing portion 10 has a width larger than the width of the dividing portion 10. At least one side of the fillet 20 having a width greater than the width of the divided part 10 is formed to be stepped, and the stepped surfaces 21A and 21B have the stepped edges at the edges of the workpieces to which the filleting process is to proceed. It is preferable to form the curved surfaces 21A and 21B having a curvature corresponding to the design curvature of the portion. The stepped surfaces 21A and 21B may also be formed by the inclined surface or the combination of the inclined surface and the curved surface according to the desired edge shape of the workpiece. Hereinafter, the curved surfaces 21A and 21B may be formed on both sides of the fillet 20. Described by way of example formed in.

The upper edges of the curved surfaces 21A and 21B function as fillets edges that come into contact with the cut edges of the workpiece and process the same when the fillets are processed.

Here, as shown in FIG. 3, the curved surfaces 21A and 21B of the fillet portion 20 are preferably formed to be inclined with respect to the vertical line toward the dividing portion 10, and the curved surfaces 21A, The top of 21B) provides a sharper cutting edge angle with respect to the workpiece.

The upper surface of the fillet portion 20, preferably the upper surface of both sides, that is, the upper portion of the portion formed with the curved surface (21A, 21B) is formed by the inclined surface (21A-1, 21B-1) inclined upwardly to the rear do. In the structure of such a fillet part 20, the chip | tip which generate | occur | produces when a to-be-processed object is processed by the upper cutting edge of curved surface 21A, 21B is this inclined surface 21A-1, 21B-1. Move upward along.

On the other hand, Figure 4 is a cross-sectional view taken along the line A-A of Figure 3, the insert and the upper, lower gripper according to the present invention is shown together.

1 and 4, in the present invention, the upper groove 25 for the grip is formed on a part of the upper surface of the fillet portion 20, that is, the upper surface behind the protrusion 13 along the longitudinal center line. And / or the lower groove 26 for grip is formed on the entire lower surface of the fillet portion 20 and the dividing portion 10 along the longitudinal center line, so that the insert 100 can be seen by the upper and lower grippers G1 and G2. It is desirable to have a structure that can be securely fixed. In addition, it is possible to provide a more rigid grip by forming a plurality of serrations on the inner surfaces of the upper and lower grooves 25 and 26 for the grip, although not shown in the drawing.

The upper and lower grooves 25 and 26 for the grip are preferably composed of double grooves formed by overlapping two grooves having different curvatures (as shown in FIG. 4). The double groove has a longitudinal protrusion formed over the boundary of the grooves having different curvatures, which functions as a contact surface with the gripper end. This structure will be described in more detail.

The upper groove 25 includes a first groove 25-1 and a second groove 25-2. A first groove 25-1 having a first curvature in the longitudinal direction is formed on an upper surface of the chamfer 20, and a bottom larger than the first curvature is formed on the bottom surface of the first groove 25-1. A second groove 25-2 having two curvatures is formed along the first groove 25-1. Therefore, protrusions P11 and P12 are formed in the longitudinal direction at both boundary portions of the first groove 25-1 and the second groove 25-2.

The lower groove 26 also includes a third groove 26-1 and a fourth groove 26-2. A third groove 26-1 having a third curvature is formed on the lower surfaces of the dividing portion 10 and the fillet portion 20 over the entire length, and the ceiling surface of the third groove 26-1 is formed. The fourth groove 26-2 having a fourth curvature larger than the third curvature is formed therein. Therefore, longitudinal protrusions P21 and P22 are formed at both boundary portions of the third groove 26-1 and the fourth groove 26-2.

When mounting the insert 100 to the tool holder, the upper and lower grooves G1 and G2 of the tool holder form upper and lower grooves 25 and 26, respectively, formed on the upper and lower surfaces of the insert 100, respectively. Contact and pressurization. At this time, the upper gripper (G1) is in contact with the longitudinal projections (P11, P12) formed on the boundary between the first groove 25-1 and the second groove 25-2 formed on the upper surface of the mower 20. At the same time, the lower gripper G2 contacts the protrusions P21 and P22 formed at the boundary between the third groove 26-1 and the fourth groove 26-2 formed on the lower surface of the mower 20, respectively. It is desirable to be. Therefore, the curvature of each gripper end is preferably formed larger than the first and third curvature and smaller than the second and fourth curvature.

As such, the grippers G1 and G2 come into contact with the insert 100 at two contact points (i.e., P11, P12 and P21, P22), thereby preventing variation in the contact position due to machining error and Since the forces applied can be balanced, the insert 100 can be mounted more accurately and firmly in the tool holder.

Here, in order to use the upper gripper G1 and the lower gripper G2 of the same specification, it is preferable that the first curvature is the same as the third curvature and the second curvature is the same as the fourth curvature.

The function of the insert having the above configuration will be described with reference to FIGS. 1 to 3 and FIGS. 5A and 5B.

5A is a plan view illustrating a process of turning the workpiece 200 using the insert 100 according to the present invention shown in FIGS. 1 to 4, and FIG. 5B illustrates a fillet process performed after the dividing process. It is a top view which shows. 5A and 5B, holders supporting the inserts are not shown for convenience.

After mounting the insert 100 according to the invention to a holder (not shown) via clamping means, the tool corresponds to the rotating workpiece 200 and then moved towards the workpiece 200 by inserting it. The cutting edge 11 at the tip of the divided part 10 of 100 cuts the workpiece 200 (state of FIG. 5A).

The chips produced in the workpiece 200 by the cutting edges 11 of the dividing portion 10 are guided by the grooves 12 formed in the upper surface of the distal end portion 10, and then in the groove 12. It exits and comes in contact with the inclined surface 13A of the projection 13. The chip is cut in the process of moving along the inclined surface 13A of the protrusion 13.

As the dividing process continues, the insert 100 cuts the workpiece 200, and then the curved surfaces 21A and 21B formed at both front end surfaces of the fillet part 20 are cut workpieces ( 200 is in contact with the cutting edge edge (state of FIG. 5B).

When the workpiece 200 continues to rotate in this state, both cutting edges of the workpiece are processed while contacting the upper edges (the fillet edges) of the curved surfaces 21A and 21B of the fillet portion 20 so as to be curved. It is processed (filled) into a shape having the same curvature as the curvature of (21A, 21B) .

The chip generated by the fillet edge of the fillet 20 is guided by the inclined surfaces 21A-1 and 21B-1 formed on the curved surfaces 21A and 21B and discharged to the outside of the insert 100.

Chips generated during the fillet processing by the inclined surfaces 21A-1 and 21B-1 do not flow between the insert 100 (especially the fillet 20) and the workpiece 200, and thus the machining process is performed. No adverse effects (e.g., workpiece surface defects occurring) are affected.

Preferred embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art having various ordinary knowledge of the present invention may make various modifications, changes, and additions within the spirit and scope of the present invention. And additions should be considered to be within the scope of the following claims.

The insert according to the present invention having such a structure and function has the following features.

The use of a single insert to perform the splitting and filleting process eliminates the need for removing the splitting insert from the tool holder after the splitting process and mounting the filleting insert. In other words, the cutting process can be performed immediately after the dividing process on the workpiece, without replacing the insert, thereby greatly reducing the overall processing time.

In addition, by manufacturing the insert for the splitting process and the insert for the filleting process as a single insert it is possible to significantly reduce the insert manufacturing cost and manufacturing time.

Claims (12)

Dividing part for cutting the rotating workpiece; And It has a wider than the width of the dividing portion, and is formed integrally with the dividing portion at the rear end of the dividing portion and includes a fillet for fillet processing the workpiece cut by the dividing portion, A cutting edge is formed at the top of the distal end of the cutting part in contact with the work to be cut, and at least one side of the wide fillet is stepped, and the front surface of the cut surface has a cut edge of the cut workpiece. An insert characterized by having a top edge that can be filleted. The insert of claim 1, wherein the stepped surface comprises a curved surface. The insert according to claim 1, wherein the dividing portion includes a groove formed in a longitudinal direction on an upper surface of the distal end portion, and the distal end portion of the groove corresponds to a cutting edge. The insert of claim 1, wherein the dividing portion includes a protrusion formed at the rear of the groove, and the front surface of the protrusion is formed of an upwardly inclined surface. The insert according to any one of claims 1 to 4, wherein the fillet portion is formed with an inclined surface whose upper surface is inclined upwardly to the rear. The insert according to any one of claims 1 to 4, wherein the fillet portion is provided with a grip groove formed on an upper surface thereof along a longitudinal center line. The insert according to claim 6, wherein a plurality of serrations are formed on an inner surface of the grip groove. 7. The insert according to claim 6, wherein the groove for grip is formed by a double groove having two grooves having different curvatures overlapped and a longitudinal protrusion formed over the boundary thereof. The insert according to any one of claims 1 to 4, wherein the fillet portion and the dividing portion are formed with a groove for grip along a longitudinal center line at a lower surface thereof. 10. The insert according to claim 9, wherein a plurality of serrations are formed on an inner surface of the grip groove. 10. The insert according to claim 9, wherein the groove for grip is formed of a double groove having two grooves having different curvatures overlapped and a longitudinal protrusion formed over the boundary thereof. The insert according to any one of claims 1 to 4, wherein the curved surface is inclined toward the dividing portion with respect to a vertical line.

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