KR20090104668A - Indexable insert with nick - Google Patents

Abstract

PURPOSE: A blade edge replaceable tip with a nick for a cutting tool is provided to reduce cutting resistance by processing cut swarf with a nick cutting edge and suppress the vibration by reducing impact during cutting. CONSTITUTION: A blade edge replaceable tip with a nick for a cutting tool comprises a side surface(3), a top surface(1), a cutting edge, and a plurality of nick grooves(8). The side surface forms a rake face. The top surface forms the flank face. The cutting edge is a ridge of the location in which the side surface and the top surface intersect. A plurality of nicks groove divides the cutting edge into a plurality of sections. The width of the nick grooves gradually increases toward the end.

Description

Blade tip interchangeable tip with nicks {INDEXABLE INSERT WITH NICK}

TECHNICAL FIELD The present invention relates to a blade tip interchangeable tip having a nick used as a cutting edge of various cutting tools such as a face milling cutter or an end mill.

The well-known blade exchangeable tip includes a tip (blade tip exchangeable tip having a nick) in which a cutting edge ridge is divided in the longitudinal direction by a plurality of grooves. The tip with this nick is mainly provided as a cutting edge for a grinding tool. In a face milling cutter or the like, a nick cutting edge is employed as the main cutting edge (outer peripheral cutting edge). In the use of such a transfer tool, the tip provided with the nick on the outer circumference of the tool body (cutter body) is not cut by the preceding tip, but the tip of the nick groove of the nick cutting edge so that the following tip complements the remaining portion in the shape of a comb. The phases are shifted in the axial direction (called step arrangement).

As a prior art of a tip having such a nick, for example, there is one described in Patent Documents 1 and 2 below. In a throw-away insert disclosed in Patent Literature 1, a groove (in the present invention, this groove is referred to as a nick groove) for dividing the main cutting edge into a comb-toothed shape at an angle intersecting the main cutting edge at an angle. It is formed in the flank face so that it may extend. Such a groove (nick groove) is formed so that the end is on the clearance surface, and the width is constant from the position of the cutting edge to the end, and gradually narrows in the depth direction. In addition, the tip illustrated by patent document 1 is a tip used vertically which uses a side as an rake face, and uses an upper and lower side as a clearance surface.

In the slow away tip disclosed in Patent Document 2, a nick groove for dividing the main cutting edge is formed on the side surface. The tip of this patent document 2 differs from the tip of patent document 1 in that it is used by what is called a horizontal use posture whose upper and lower surfaces become inclined surfaces, and a side surface becomes a clearance surface. In addition, the nick groove extends from the edge of the upper surface side to the edge of the lower surface side (the nick groove completely crosses the side surface of the tip in the tip thickness direction), which is different from the tip of Patent Document 1.

[Patent Document 1] Japanese Utility Model Publication Hei 6-7856

[Patent Document 2] Japanese Patent Application Laid-Open No. 2006-305716

The slow away tip disclosed in patent document 1 aims at the following effects. That is, the effect of reducing the cutting resistance due to processing while cutting the cutting debris with the nick cutting edge; Increasing the cutting resistance by inclining the nick groove at approximately the same angle as the axial rake of the cutting edge with respect to the main cutting edge, making the width of the nick groove constant, and narrowing the width of the nick groove at the bottom of the groove. Reduction effect; It is an object of the present invention to provide a cutter vibration suppression effect due to shock reduction during cutting. However, since the groove width of the nick groove is constant, the amount of relief of the groove surface of the nick groove cannot be sufficiently secured. Therefore, depending on the cutting conditions (e.g., when the feed is made large), since the groove surface comes into contact with the workpiece, there is a problem that sufficient functions are not exerted and the processing conditions are limited.

Moreover, in the tip which has the nick used vertically which makes the side surface larger in area than a top surface, the depth direction of a nick groove becomes the thickness direction of a tip. And from the viewpoint of securing the strength of the tip, the nick groove cannot extend to the end of the tool rotation direction of the clearance surface. For this reason, the tip has a radial rake of the inclined surface close to zero or a radial inclination when viewed along a cross section perpendicular to the axis of the tool until the end of the nick groove and the workpiece are not interfered with. The negative angle is tilted in the direction of increasing. However, the radial inclination of the inclined surface cannot be made small without limitation. For this reason, the substantial outer periphery clearance angle of the nick groove is also limited to a small range, which also causes a limitation in the machining conditions.

On the other hand, in the horizontally used tip disclosed in Patent Document 2, the effect of nick grooves on the strength is small compared to the vertically used tip. For this reason, although the nick groove can be manufactured with the groove extended from the upper surface side to the lower surface side, since this cutting force is received in the thickness direction, this tip is not suitable for heavy cutting.

The present invention improves the tip having a nick used vertically as disclosed in Patent Literature 1 to give an appropriate clearance to the groove face of the nick groove, thereby reducing the contact of the workpiece to the clearance surface to reduce the machining conditions. It is a task to widen.

In order to solve the above problems, in the present invention,

As a blade tip interchangeable tip with a nick for a grinding tool,

The side that is the slope,

The upper surface,

A cutting edge that is a ridge line at a position where the side surface and the upper surface cross each other;

A plurality of nick grooves for dividing the cutting edge into a plurality of nick grooves, each having a termination on the upper surface, the nick groove gradually increasing toward the end of the nick groove

It was set as the blade tip exchangeable tip which has the nick for the grinding | polishing tools containing these.

As for the nick groove formed in this tip, it is preferable to set the ratio of the groove width W1 of the terminal part to the groove width W of the inlet part which contact | connected the said ridgeline to 1.1W-2.0W. In addition, it is preferable that the nick groove is a groove formed by pressing, and it is preferable that the groove width on the groove edge side is a tapered groove larger than the groove width on the groove bottom side.

In the tip of the present invention, the groove width of the nick groove is increased toward the end of the groove. For this reason, when the cutting conditions such as the feed amount are changed, an appropriate margin of the groove face of the nick groove is ensured even at the end side of the groove. As a result, effects such as reduction of cutting resistance due to the function of the nick grooves can be obtained.

The lower limit of the ratio of the groove width W1 of the terminal portion to the groove width W of the inlet portion of the nick groove is preferably about 1.1 W in order to obtain the effect of the invention. From the viewpoint of securing the margin of the groove surface, the groove width W1 of the terminal portion is larger. The upper limit of the ratio of the groove width W1 of the end portion is preferably 2.0 W in order to ensure the cutting edge length between the nick grooves at least the same dimension as the groove width of the inlet portion of the nick groove. If these conditions are satisfied, the two tips cover the missing portions (nick groove forming portions) of the cutting edges of the tips with each other, and cutting can be performed without remaining portions.

The nick groove formed in the tip of the present invention may be formed by cutting. However, since cutting of grooves with varying widths takes time, it is preferable to mold by presses having almost no restrictions on the molding conditions.

Further, if the nick groove is a tapered groove whose groove width on the groove edge side is larger than the groove width on the groove bottom side, it is easy to mold, and the groove edge is acute, and the effect of increasing the strength can also be obtained.

EMBODIMENT OF THE INVENTION Hereinafter, based on FIGS. 1-6, embodiment of the blade tip changeable tip which has the nick of this invention is described. The blade tip exchangeable tip (hereinafter simply referred to as a tip) 10 having a nick shown is produced by first forming a green compact from a raw material powder such as cemented carbide by pressing and sintering the green compact. do. By forming the inclined side surface 3 into a curved surface, the ridge 5 at the position where the side surface 3 and the upper surface 1 intersect is curved, and when the ridge line 5 is used as a cutting edge, It is easy to secure the axial rake of the. 2 is a lower surface, and when the upper and lower surfaces of the tip of FIG. 1 are inverted, the surface of the same shape as the upper surface before inversion will appear on a surface. That is, the lower surface 2 is the same structure as the upper surface 1, and can be replaced with the upper surface 1. Thus, since the lower surface 2 is the same structure as the upper surface 1, the description about the lower surface 2 is abbreviate | omitted. Reference numeral 4 is an end face, reference numeral 6 is a ridge line formed between the upper face 1 and the end face 4, and reference numeral 7 in FIG. 4 is a mounting hole formed in the center of the upper and lower surfaces.

In the upper surface 1, a plurality of nick grooves 8 are formed to divide each ridge 5 in the longitudinal direction along two ridge lines 5 formed between the two side surfaces 3 and the upper surface 1. Each nick groove 8 is formed at a predetermined interval in the longitudinal direction of each ridgeline 5.

The tip 10 shown in FIG. 1 has the positions of the nick groove 8 dividing the ridge on the left side (indicated by 5L for convenience of description) and the nick groove 8 dividing the ridge line on the right side (as indicated by 5R) in FIG. The ridges are shifted in the longitudinal direction. Thereby, the step arrangement state of the cutting edge for complementary cutting is provided without changing the phase in the tool axial direction of the tip mounting position with respect to the tool body.

Each nick groove 8 extends in a direction substantially parallel to the ridge line 6. In addition, in order to suppress the decrease in the strength of the tip, the end 8e of the groove is formed so that the groove 8 does not extend from one side to the other side (the groove does not reach the end of the tool rotation direction of the allowable surface in the use state). It is arranged on). In addition, the length of the groove is as short as possible. As shown in Fig. 5, the groove width of the nick groove 8 is such that the relationship between the groove width W at the inlet portion and the groove width W1 at the terminal 8e portion is W1> W. It gradually increases toward the terminal 8e from the inlet of. The groove width W1 at the end 8e is set in the range described as preferable, that is, 1.1 W to 2.0 W.

The nick groove 8 is formed by a press, and as shown in Fig. 6, the groove width Eg on the groove edge side is a tapered groove larger than the groove width Bg on the groove bottom side.

7 and 8 show a face milling cutter using the exemplified tip 10 as a cutting edge. The front milling cutter 20 has a predetermined distance in the circumferential direction of the tip base 22 and the cutting chip pockets 23 adjacent to each tip base on the outer periphery of the tip of the tool body (cutter body) 21. It is provided with a plurality. And this front milling cutter 20 uses the tip 10 which uses 5L as a cutting edge for each tip base 22, and the tip 10 which uses 5R as a cutting edge. I put it on alternately.

As for each tip 10, one side surface 3 is an inclined surface, the upper surface 1 is an outer periphery clearance surface, and ridgelines 5L and 5R are main cutting blades. The ridgeline 9 formed between the side surface 3 and the end surface 4 is a sub-cutting edge, and each tip has a direction in which the end surface 4 becomes a front clearance surface (the clearance surface of the secondary cutting edge). It is placed on the tip base 22. Thereafter, each tip is fastened by the clamp bolt 24 which passed the mounting hole 7, and each tip is fixed to the tool main body 21. As shown in FIG.

In the above-described front milling cutter 20, one of the main cutting edge composed of the ridgeline 5L and the main cutting edge composed of the ridgeline 5R first cuts the cutting region of the workpiece in a divided state. The other main cutting edge cuts the left to-be-cut area | region which was not cut by the main cutting edge. At this time, the to-be-cut area left uncut by the preceding main cutting edge enters the nick groove 8 of the preceding main cutting edge. However, in the present invention, as described above, the groove width W1 at the end 8e portion is made larger than the groove width W at the inlet portion of the nick groove 8, and thus the to-be-cut area to be left without cutting. The problem of increasing the cutting resistance in contact with the groove face of the nick groove is unlikely to occur. Therefore, the setting range, such as a feed condition of a tool, can be extended. For this reason, it becomes possible to draw out the function of the nick cutting edge under the cutting conditions expanded conventionally, and it becomes possible to perform stable cutting with low resistance.

Moreover, this invention demonstrates the effectiveness also when it applies to tip for transfer tools other than a front milling cutter, such as an end mill and a side cutter.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the upper surface of the tip of embodiment of this invention.

FIG. 2 is a side view of the tip of FIG. 1. FIG.

3 is a bottom view of the tip of FIG. 1.

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

5 is an enlarged view of the nick groove of FIG. 1.

FIG. 6 is a cross-sectional view taken along the line Y-Y of FIG. 5.

7 is a perspective view showing an example of the use of the tip of FIG. 1 (a face milling cutter with a nick).

8 is a side view of the face milling cutter with nick of FIG. 5. FIG.

Claims (7)

As a blade tip interchangeable tip with a nick for a grinding tool, Side (3) which is a rake face The upper surface 1 which is a flank face, A cutting edge which is a ridge line 5 at a position where the side surface 3 and the upper surface 1 cross each other, A plurality of nick grooves 8 for dividing the cutting edge into a plurality of nick grooves, the nick grooves 8 having an end on the upper surface 1 and the groove width gradually increasing toward the end thereof. Blade tip interchangeable tip having a nick for a grinding tool comprising a. The ratio of the groove width W1 of the end portion of the nick groove 8 to the groove width W of the inlet portion in contact with the ridgeline 5 is 1.1 W to 2.0 W. Blade tip interchangeable tip with nick. 2. The blade tip interchangeable tip according to claim 1, wherein the nick groove (8) is a groove formed by a press. 3. The blade tip interchangeable tip according to claim 2, wherein the nick groove (8) is a groove formed by a press. 2. The blade tip changeable tip according to claim 1, wherein the nick groove (8) is a tapered groove whose groove width (Eg) on the groove edge side is larger than the groove width (Bg) on the groove bottom side. 3. The blade tip changeable tip according to claim 2, wherein the nick groove (8) is a tapered groove whose groove width (Eg) on the groove edge side is larger than the groove width (Bg) on the groove bottom side. 4. The blade tip changeable tip according to claim 3, wherein the nick groove (8) is a tapered groove whose groove width (Eg) on the groove edge side is larger than the groove width (Bg) on the groove bottom side.

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