JP4889300B2 - Throw-away insert and cutting tool equipped with it - Google Patents

Description

  The present invention relates to a throw-away insert used for processing a work material having low thermal conductivity and a cutting tool equipped with the throw-away insert.

In recent years, in order to increase the efficiency of cutting, high-speed cutting with a high cutting speed or heavy cutting with a large depth of cut has been frequently used. Along with this, as a characteristic of the throw-away insert used for cutting, high chip discharge and wear resistance are required, and various throw-away inserts are provided to achieve such a problem. For example, as in Patent Document 1, a throw-away insert is known in which slits are arranged in a raised portion formed on a rake face, and a groove portion communicating with the slit is formed. With such a configuration, the contact area between the chip and the raised portion is reduced, and cutting resistance is reduced. As a result, an effect that wear due to scraping with chips is suppressed is obtained.
JP 2001-252803 A

  However, with the above-mentioned throw-away inserts, under severe cutting conditions accompanying the recent higher efficiency of cutting, it is possible to reduce the throwing speed during cutting only by suppressing the temperature rise caused by the reduction of the contact area between the chip and the raised portion. The temperature of the away insert sometimes became high. Especially when machining materials with low thermal conductivity such as stainless steel, the temperature of the throw-away insert tends to be high. In addition to wear on the rake face, peeling of the coating film on the throw-away insert surface and chip welding Etc. are likely to occur.

  Further, since the slits are provided in the raised portions, the strength of the raised portions is reduced, and there is a problem that the raised portions are easily chipped under severe cutting conditions such as heavy cutting.

  The present invention has been made in order to solve such problems of the prior art, and reduces the breaker strength even in high-speed cutting or heavy cutting or cutting of a work material with low thermal conductivity. Therefore, an object of the present invention is to provide a throwaway insert that exhibits high welding resistance and wear resistance by suppressing an increase in temperature of the throwaway insert and having an excellent heat dissipation effect.

In order to solve the above problems, the throw-away insert of the present invention has an upper surface as a rake surface, a lower surface as a seating surface, and a side surface as a flank surface, and at least a part of an intersecting ridge line portion between the rake surface and the flank surface. A generally flat throw-away insert having a cutting edge, wherein the rake face is adjacent to the first rake face area disposed in the vicinity of the cutting edge, and the cutting edge. And a second rake face region disposed behind the first rake face area and in a rake face central area not involved in the curling action of the chips , wherein the second rake face area includes a plurality of rake face areas. At least one of the concave portion and the plurality of convex portions is arranged in a matrix.

  With such a configuration, the surface area of the rake face is increased with the chip curling action without reducing the breaker strength, and thus the diffusion of heat generated during cutting is promoted. Because of this heat dissipation effect, rake face wear, chip welding, film peeling, etc. are suppressed, so long-life throw-away inserts are possible even when machining materials with low thermal conductivity such as stainless steel. .

  Moreover, it is desirable that the concave portion is substantially hemispherical because the surface area of the rake face is efficiently increased, an excellent heat dissipation effect is obtained, and clogging of chips is suppressed.

  Furthermore, in order that the said convex part is connected with the said adjacent convex part by the concave curved surface, it is effective in increasing the surface area of the said rake face, and it is excellent in the heat dissipation effect, In order to suppress clogging of chips. desirable.

  Further, the formation of at least one of a plurality of concave portions and a plurality of convex portions on the seating surface increases a frictional force acting between the holder and the throw-away insert, and the throw-away insert is attached to the holder. This is desirable because it is stably fixed without shifting.

  Furthermore, a plurality of convex portions whose top portions include a plane are formed on the seating surface, and the convex portions are formed by positioning the plane portions of the plurality of convex portions in the same plane. The seating surface is desirable because it acts as a sufficient contact surface when the throw-away insert is attached to the holder, and the throw-way insert can be more stably fixed to the holder.

  In addition, since the cutting tool includes the above-described throw-away insert and the holder on which the throw-away insert is detachably provided, both the throw-away insert and the holder are less likely to wear due to the excellent heat dissipation effect of the throw-away insert. In addition, slipping of the throw-away insert is suppressed, and the throw-away insert and the holder are stably fixed, which is desirable because high processing accuracy can be obtained.

According to the throw-away insert of the present invention, the rake face consists of the first rake face area and the second rake face area disposed in the rake face central area not involved in the curling action of the chips, and the second rake face area. By arranging at least one of the plurality of concave portions and the plurality of convex portions in a matrix, the chip curling action is maintained without reducing the breaker strength, and the surface area of the rake face is increased. Since the heat generated during cutting can be effectively diffused and dissipated, rake face wear, chip welding, film peeling, etc. are suppressed, and it is long even when processing work materials with low thermal conductivity. it is possible to life throws away insert.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 and 2 and FIGS. 4 to 9 show an embodiment of the present invention. FIG. 1 shows an entire throw-away insert (hereinafter abbreviated as an insert) 1 according to a first embodiment of the present invention. 2A is a plan view, FIG. 2B is a side view, FIG. 4B is a bottom view, FIG. 4 is an overall perspective view of an insert 21 according to the second embodiment of the present invention, and FIG. 4A is a plan view, FIG. 6B is a side view, FIG. 6B is a bottom view, FIG. 6 is an overall perspective view of the insert 31 according to the third embodiment, and FIG. (B) Side view, (c) Bottom view, FIG. 8 (a) Enlarged view of the main part of FIG. 7, (b) AA sectional view of (a), FIG. It is the (a) whole perspective view, (b) top view, (c) side view of the insert 41 by embodiment. FIG. 3 is a perspective view of a turning tool equipped with the insert of the present invention.

  1 and 2, the insert 1 according to the first embodiment is composed of a substantially polygonal plate-like body, specifically a substantially parallelogram-like body, with a seating surface 2 on the lower surface of the body and an upper surface. It has a rake face 3 and a flank face 4 on the side face. A cutting edge 5 is formed at the intersection ridge line between the rake face 3 and the flank face 4.

  The rake face 3 is adjacent to the first rake face area 6 disposed in the vicinity of the cutting edge and the first rake face area 6, and is arranged behind the first rake face area 6 with respect to the cutting edge 5. The second rake face region 7 is provided. The first rake face area 6 of the present embodiment is disposed in a rake face area involved in the curling action of chips, such as a land portion adjacent to the cutting edge 5 or a breaker. Further, the second rake face area 7 is a rake face central area not involved in the curling action of chips, for example, the insert side of the insert in which the upper and lower faces of the insert have the same surface configuration and the upper and lower faces of the insert are used. It corresponds to a portion in contact with the holder receiving surface 10, a so-called seat surface of the insert, and a seating portion of the insert.

  Here, a plurality of recesses 8 are arranged in parallel in the second rake face region 7 of the insert 1. That is, the plurality of concave portions 8 are arranged side by side, and are arranged in a matrix (matrix shape) here. Specifically, as shown in FIG. 2A, when two directions parallel to the cutting edge 5 are X and Y, a plurality of concave portions 8 are regularly arranged in both the X and Y directions. On the other hand, in the first rake face region 6, such a recess 8 is not provided side by side.

  By adopting such a configuration, the surface area of the insert 1 is increased with a sufficient chip curling action without reducing the strength of the breaker formed in the first rake face region 6. The area of contact with the air increases, heat generated during processing is easily radiated into the atmosphere, and an excellent heat dissipation effect is obtained. Therefore, the temperature rise of the insert surface is suppressed, and rake face wear, chip welding, film peeling, and the like are suppressed. As a result, a long-lived throw-away insert can be achieved even in cutting of severe conditions and machining of work materials with low thermal conductivity.

As described above, in order to dissipate heat generated during processing, the recesses 8 are preferably formed densely in the second rake face region 7. Specifically, the cross-sectional area of the opening of the recess 8 is preferably 0.5 to 1 mm ² / piece. In addition, it is preferable that 0.1 to 1 recess 8 is formed per 1 mm ² . As a result, a heat dissipation effect can be obtained effectively, and the strength can be maintained on the entire rake face of the insert 1 on average. Such strength can be maintained even when the recesses 8 are regularly arranged as described above, but this effect is further enhanced by the dense arrangement of the recesses 8. In the present embodiment, the recesses 8 are formed with a cross-sectional area of 0.5 mm ² / piece and 0.5 per 1 mm ² .

  Further, as described above, in order to dissipate heat generated during processing, the recess 8 is preferably substantially hemispherical as shown in FIG. Since the concave portion 8 is substantially hemispherical, the surface area of the rake face 3 is efficiently increased, and an excellent heat dissipation effect is obtained. In addition, even when chips such as powder are generated, chips are less likely to be clogged in the concave portion 8, and the catching of elongated chips that are easily generated under conditions such as low feed is also suppressed. Furthermore, even when chips accumulate on the rake face 3 of the insert due to processing at the wall or the like, catching of the chips is suppressed, and as a result, wrapping of the chips on the holder or the like is suppressed.

  Here, as shown in FIG. 3, the insert of the present invention is a throw-away insert that is used by being detachably attached to a holder, and the insert hits at least a part of the seating surface 2 against the holder receiving surface 10. Fixed in contact. Therefore, some of the heat generated in the insert during cutting is transmitted to the holder, and the holder temperature also rises. As a result, there is a problem that the holder is softened and the holder is likely to be worn by collision with high-temperature chips.

  Therefore, in order to dissipate the heat generated during processing as described above, it is more preferable that the seating surface 2 has a surface configuration having a heat dissipating effect. Specifically, as in the first embodiment shown in FIG. 2C, the recess 8 is preferably formed on the seating surface 3. By setting it as such a structure, the heat | fever generate | occur | produced with the insert 1 can be thermally radiated not only from the scoop surface 3, but also from the seating surface 2. FIG. In addition, as the recessed part 8 formed in the seating surface 2, it is preferable to connect with the adjacent recessed part further in addition to the above-mentioned shape. As a result, a passage for air, a so-called vent hole, is formed between the seating surface 2 and the holder receiving surface 10, and some of the heat transmitted from the vent hole to the holder out of the heat generated in the insert 1 is in the air. Therefore, the heat dissipation effect of the insert 1 is further enhanced. In addition, moderate friction is generated between the holder and the seating surface 2 that is in contact with the holder receiving surface 10, so that the insert is stably fixed to the holder.

  In addition, as another surface configuration of the seating surface, a plurality of protrusions are formed on the seating surface 2 in order to make the seating surface 2 have a superior heat dissipation effect as in the second embodiment shown in FIG. The part 9 may be juxtaposed. As for the convex part 9 formed in the seating surface 2, the top part 11 of a convex part is comprised including the plane, and it is preferable that the plane part of this convex part is located in the same plane. With such a configuration, the top portion 11 of the convex portion formed on the seating surface of the insert serves as a contact surface with the holder receiving surface 10, so that a stable contact surface can be secured and the insert can be fixed without shifting. Is done. As a result, high processing accuracy is possible.

  Further, as another surface configuration of the seating surface, the seating surface is the same as the rake surface 3 as shown in FIG. 2A, like the insert 21 of the second embodiment shown in FIGS. Even with this surface configuration, an excellent heat dissipation effect can be obtained. As shown in FIG. 5, the insert 21 in this case has a so-called negative shape with a clearance angle of 0, and both the upper and lower surfaces of the insert function as a seating surface and a rake surface. In such an insert, in order to efficiently promote the diffusion of heat and exhibit an excellent heat dissipation effect, the upper and lower surfaces of the insert have the above-described first rake face region 6 in the rake face area 6 as in the rake face 3 of the present embodiment. Such recesses and projections are not formed, and at least one of the plurality of recesses and projections as described above is preferably arranged in parallel in the second rake face region 7. Here, the effect when the surface having the surface configuration of the rake face 3 described above functions as the rake face is as described above. When the surface having the surface configuration of the rake surface 3 functions as a seating surface, the second rake surface region 7 is a contact surface with the holder receiving surface 10 when the insert is attached to the holder, and the second rake Since at least one of the plurality of concave portions and convex portions is arranged in parallel in the surface region 7, moderate friction is generated between the holder and the insert, so that the insert is stably fixed to the holder.

  As described above, as the embodiment of the seating surface 2, the embodiment in which the concave portion 8 or the convex portion 9 is formed on the seating surface 2 and the embodiment in which the seating surface 2 has the same surface configuration as the rake face 3 have been shown. Also in the form, by making the seating surface 2 a surface having irregularities, slipping of the insert is suppressed, and high processing accuracy is possible. Furthermore, it is preferable to form a vent hole between the seating surface and the holder receiving surface because heat transmitted to the holder is dissipated into the air.

  Next, a third embodiment of the present invention will be described with reference to FIGS. In addition, about the structure similar to 1st embodiment, the same referential mark is attached | subjected and the overlapping description shall be abbreviate | omitted.

  As shown to Fig.7 (a), as for the insert 31 of 3rd embodiment, the several ridge part 9 is regularly arranged in parallel by the 2nd rake face area | region 7 at the matrix form. More specifically, the plurality of convex portions 9 are arranged in parallel at equal intervals in both the X and Y directions shown in the figure. In other words, the convex portions 9 formed in the second rake face region 7 are separated from each other by the groove portion 12. In the present embodiment, the grooves 12 are arranged in a lattice pattern. With such a configuration, since the surface area of the rake face 3 can be effectively increased, an excellent heat dissipation effect can be obtained.

  Moreover, when the convex part 9 is formed in the seating surface 2, since the groove part 12 which spaces apart the convex part 9 is arrange | positioned crossing, the passage of air arises between the holder receiving surface 10 and the insert 31. A part of the heat to be transferred to the holder side is efficiently radiated to the atmosphere. Specifically, the groove portions 12 are preferably formed at intervals of 0.5 to 3 mm. In addition, in the insert 31 of this embodiment, the groove part 12 is formed at intervals of about 1 mm.

  Here, in the present embodiment, the embodiment in which the groove portions 12 arranged in parallel in two directions are formed to be orthogonal to each other, but the angle α formed by the intersecting groove portions 12 shown in FIG. The groove part 12 should just be formed so that the surface area of a surface may increase, and it is not limited to 90 degree | times. That is, when the groove portions arranged in parallel in the two directions are substantially parallel, in other words, when the groove portions are formed substantially side by side in one direction, the air fluidity between the groove portions is lowered, and an excellent heat dissipation effect is obtained. Absent.

  Further, as described above, in order to efficiently dissipate heat generated during processing, as shown in FIG. 8 (b), it is preferable that the convex portions 9 are connected to the adjacent convex portions 9 by concave curved surfaces. Is good. That is, in the present embodiment, as described above, the convex portions 9 are separated from each other by the groove portion 12, but the cross-sectional shape of the groove portion 12 is substantially semicircular as shown in FIG. It is good. Here, FIG. 8B corresponds to a cross-sectional view taken along line AA in FIG. With such a configuration, the surface area of the rake face 3 can be increased efficiently, and problems such as chipping are less likely to occur.

  Further, as described above, in order to efficiently dissipate the heat generated during processing, at least the concave portion 8 and the convex portion 9 are formed on the flank 4 excluding the flank face adjacent region where the flank wear is seen. Either one may be arranged in parallel. FIG. 9 shows an insert 41 according to a fourth embodiment of the present invention in which a recess 8 is formed in the flank 4. Thus, since the surface area of the whole insert is increased by forming the concave portion 8 or the convex portion 9 also on the flank 4, the contact area with the air of the entire insert is increased, and the heat generated during cutting is increased. Spreading is promoted. As a result, an excellent heat dissipation effect can be obtained. The insert 41 of the present embodiment has a so-called negative shape with a relief angle of 0, but, unlike the insert 21 shown in FIG. 5, a single-sided insert having a different surface configuration on the upper and lower surfaces of the insert is illustrated.

  As described above, in FIGS. 1 to 9, the embodiment in which only one of the concave portion 8 or the convex portion 9 is formed in the seating surface 2 and the second rake face region 7 is shown. Even if both are arranged in parallel, the same effect can be obtained.

  Further, different components (recesses 8 and protrusions 9) were formed on the upper and lower surfaces of the insert, like the insert in which the recess 8 was formed in the seating surface 2 and the protrusion 9 was formed in the second rake face region 7. Even if it is a thing, the same effect is acquired.

  1 to 9 exemplify inserts in which the insert body portion has a substantially parallelogram plate shape. However, as another embodiment of the present invention, the body portion has a substantially polygonal plate shape and a substantially disk shape. It goes without saying that the same effect can be obtained even if formed in a shape.

  As mentioned above, although embodiment of this invention was illustrated, this invention is not limited to embodiment, It cannot be overemphasized that it can be made arbitrary, unless it deviates from the objective of invention.

1 is an overall perspective view of a throw-away insert according to a first embodiment of the present invention. It is (a) top view, (b) side view, (c) bottom view of the throw away insert of FIG. It is a perspective view of the turning tool equipped with the throw away insert of the present invention. It is a whole perspective view of the throw away insert by 2nd embodiment of this invention. It is (a) top view, (b) side view, (c) bottom view of the throw away insert of FIG. It is a whole perspective view of the throw away insert by 3rd embodiment of this invention. It is (a) top view, (b) side view, (c) bottom view of the throw away insert of FIG. It is the (a) principal part enlarged view of the throw away insert of FIG. 7, and the AA line sectional view of (b) (a). It is (a) whole perspective view, (b) top view, (c) side view of the throw away insert by a 4th embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insert 2 Seating surface 3 Rake face 4 Relief face 5 Cutting edge 6 First rake face area | region 7 Second rake face area | region 8 Concave part 9 Convex part 10 Holder receiving surface 11 Top part 12 of convex part Groove part 13 Holder 21 Second embodiment Insert 31 of the third embodiment Insert 41 of the fourth embodiment Insert of the fourth embodiment

Claims (6)

A generally flat throw-away insert having a scooping surface on the upper surface, a seating surface on the lower surface, and a flank on the side surface, and having a cutting edge at least at a part of the intersection ridge line portion between the rake surface and the flank surface, ,
The rake face is a first rake face area disposed in the vicinity of the cutting edge, adjacent to the first rake face area, behind the first rake face area with respect to the cutting edge , and chips. A second rake face region disposed in the center area of the rake face not involved in the curling action of the rake face, and at least one of a plurality of concave portions and a plurality of convex portions is arranged in a matrix in the second rake face region. A throw-away insert characterized by   The throwaway insert according to claim 1, wherein the recess is substantially hemispherical.   The throwaway insert according to claim 1 or 2, wherein the convex portion is connected to the adjacent convex portion by a concave curved surface.   The throwaway insert according to any one of claims 1 to 3, wherein at least one of a plurality of concave portions and a plurality of convex portions is formed on the seating surface.   4. A plurality of convex portions whose top portions include a flat surface are formed on the seating surface, and the flat portions of the plurality of convex portions are positioned in the same plane. Any one of the throwaway inserts described.   A cutting tool comprising: the throwaway insert according to any one of claims 1 to 5; and a holder on which the throwaway insert is detachably provided.

Images