JP2013075346A - Cutting tool and method for producing cutting workpiece using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting tool capable of enhancing the mounting stability of cutting inserts to a holder.SOLUTION: The cutting tool 10 has the cutting inserts 1 and a holder 20 in which the cutting insert is mounted using fixing members 30, each of the cutting inserts 1 has a polygonal-shape upper face 2, a lower face 3 with the same shape as the upper face, and a side face 4 located between the upper face 2 and the lower face 3 and having the first side face 42, the second side face 44, and the third side face 46 in this order in a width direction, the holder 20 has a lower mounting face 204 abutting on the lower face 3 of the cutting insert 1, the first mounting face 201 abutting on the first side face 42 of the cutting insert 1, the second mounting face 202 abutting on the second side face 44 of the cutting insert 1, and the third mounting face 203 located relative to the third side face 46 of the cutting insert 1 via a clearance D1.

Description

  The present invention relates to a cutting tool and a method of manufacturing a cut product using the cutting tool.

  There has been proposed a cutting tool that supports a throw-away tip used for face milling or the like using a bottom surface and a wall surface (support surface) of a cutting tool body (for example, see Patent Document 1). As shown in FIG. 3 and the like, this cutting tool supports the throw-away tip by using three or more wall surfaces (support surfaces) of the cutting tool body in addition to the bottom surface of the cutting tool body. .

  However, if it is designed to be supported and fixed using three or more parts (wall surfaces) as in Patent Document 1, variation in manufacturing accuracy (shape tolerance) of the throwaway tip and the cutting tool body, or It was difficult to support the throw-away tip as designed at all three or more sites (wall surfaces) due to variations in the throw-away tip mounting accuracy. As a result, for example, it will be supported only at two parts (wall surfaces), or a large cutting force will be applied to a wall surface with low strength such as a wall surface located on the outer peripheral side of the cutting tool body, as designed. However, the throwaway tip could not be supported, and the wall surface and the like could be lost.

  Therefore, a cutting tool capable of improving the mounting stability of the cutting insert with respect to the holder has been demanded.

JP 2003-275920 A

  One of the objects of the present invention is to provide a cutting tool capable of improving the mounting stability of a cutting insert with respect to a holder, and a method of manufacturing a cut product using the cutting tool.

  The cutting tool which concerns on embodiment of this invention is provided with the cutting insert and the holder with which the said cutting insert is mounted | worn using a fixing member, The said cutting insert is a polygonal upper surface and the lower surface of the same shape as the said upper surface And a side surface that is located between the upper surface and the lower surface and has a first side surface, a second side surface, and a third side surface in this order in the width direction, and the holder contacts the lower surface of the cutting insert. A lower mounting surface that is in contact; a first mounting surface that is in contact with the first side surface of the cutting insert; a second mounting surface that is in contact with the second side surface of the cutting insert; And a third mounting surface located via a clearance D1 with respect to the third side surface.

  A manufacturing method of a cut product according to an embodiment of the present invention includes a step of rotating the cutting tool with reference to a rotation axis of the holder, and an upper cutting edge of the rotating cutting tool on a surface of a work material. And a step of separating the cutting tool from the work material.

According to a cutting tool according to an embodiment of the present invention, the cutting tool includes: a cutting insert; and a holder to which the cutting insert is mounted using a fixing member, the cutting insert having a polygonal upper surface and the same shape as the upper surface A lower surface of the cutting insert, and a side surface that is located between the upper surface and the lower surface and has a first side surface, a second side surface, and a third side surface in the width direction, and the holder includes the lower surface of the cutting insert. A lower mounting surface in contact with the cutting insert, a first mounting surface in contact with the first side surface of the cutting insert, a second mounting surface in contact with the second side surface of the cutting insert, and the cutting And a third mounting surface located via a clearance D1 with respect to the third side surface of the insert. Therefore, it is possible to ensure excellent mounting stability by bringing the cutting insert into contact with the two surfaces of the first mounting surface and the second mounting surface of the holder with high accuracy. In addition, the fact that the cutting insert rotates or the cutting insert moves toward the third mounting surface side due to the cutting force applied during the cutting process is located through the clearance D1 with respect to the third side surface of the cutting insert. It can be effectively regulated or suppressed by the mounting surface.

It is a figure which shows the cutting insert which concerns on the 1st Embodiment of this invention, (a) is a perspective view, (b) is a top view. It is a side view which shows the cutting insert shown in FIG. 1, (a) is a X1 arrow view, (b) is a X2 arrow view, (c) is a X3 arrow view. It is a top view which expands and shows a part of cutting insert shown in FIG. It is sectional drawing which shows the state which cut | disconnected the cutting insert along each line shown by FIG. 3, (a) is sectional drawing cut | disconnected along AA line, (b) is along BB line. FIG. 4C is a cross-sectional view taken along the line C-C. It is a top view which expands and shows a part of cutting insert shown in FIG. It is the figure which looked at the cutting insert of FIG. 5 from the 1st side surface side, (a) is a side view, (b) is sectional drawing cut | disconnected along DD line, (c) is along EE line FIG. It is a figure which shows the holder which concerns on one Embodiment of this invention, (a) is the perspective view seen from the upper surface side, (b) is a side view, (c) is the perspective view seen from the lower surface side. It is a figure which shows the cutting tool which concerns on one Embodiment of this invention, (a) is the perspective view seen from the upper surface side, (b) is a side view, (c) is the perspective view seen from the lower surface side. . (A) is the side view which expands and shows a part of chip pocket of the holder of FIG. 7, (b) is a side view which expands and shows the mounting state of the cutting insert in the cutting tool of FIG. It is the figure seen from the upper surface side of insert. It is the side view which expands and shows the mounting state of the cutting insert in the cutting tool of FIG. 8, (a) is the figure which looked at the cutting insert from the side, (b) is the figure which looked at the cutting insert from the upper surface. It is process drawing which shows the manufacturing method of the cut workpiece which concerns on the 1st Embodiment of this invention. It is process drawing which shows the manufacturing method of the cut workpiece which concerns on the 2nd Embodiment of this invention.

  Hereinafter, a cutting tool according to an embodiment of the present invention will be described in detail with reference to the drawings. This cutting tool generally includes a cutting insert (hereinafter sometimes referred to as “insert”) and a holder on which the cutting insert is mounted using a fixing member.

(Cutting insert)
The cutting insert which concerns on embodiment of this invention is demonstrated in detail with reference to FIGS. Hereinafter, the hexagonal insert 1 in the plan view will be described as an example.

  As shown in FIGS. 1 and 2, the insert 1 according to the present embodiment is roughly an upper surface 2, a lower surface 3, a side surface 4 connected to the upper surface 2 and the lower surface 3, and an intersection line between the upper surface 2 and the side surface 4. And the lower cutting edge 5P located at the intersection of the lower surface 3 and the side surface 4. For example, the insert 1 may have a size in which one side of the upper surface 2 is 5 mm to 100 mm and the thickness of the upper and lower surfaces is 3 mm to 100 mm. In addition, as shown in FIG. 1, the through-hole 6 (attachment hole) penetrated from the upper surface 2 to the lower surface 3 is formed in the center part of each surface.

  As described above, the insert 1 of the present embodiment has a hexagonal shape (substantially hexagonal) as shown in FIG. The insert 1 alternately has three main corners 21 having a first inner angle α1 and three sub-corners 22 having a second inner angle α2 larger than the first inner angle α1. Here, the hexagonal shape is not limited to a strict hexagonal shape (regular hexagonal shape), but is a concept including a slight deformation within a range where the function can be exhibited. For example, this includes a case where each side or each vertex is set to be slightly curved.

  And in the insert 1 of this embodiment, the upper cutting edge 5 is located over the perimeter of the upper surface 2, and as shown in FIG.1 (b), it adjoins the both sides from one main corner 21. As shown in FIG. Since the cutting portions 5a and 5c have the same shape toward the two secondary corners 22 and 22, the cutting is performed by rotating the right hand and the left hand in both directions at each of the three main corners 21. Can do. That is, by using each of the three main corners 21 in the right-hand and left-hand directions, it can be used as the insert 1 having substantially six main corners. Here, the first interior angle α1 is substantially a right angle, and is preferably set within a range of 90 degrees ± 3 degrees, for example. In particular, the first interior angle α1 is preferably larger than 90 degrees. Note that the second interior angle α2 may be set within a range of 140 ° to 150 °. In addition, it is preferable that the length of each side is equal from a viewpoint of ensuring large length of the cutting blade which contributes to cutting, using all the sides for cutting.

  In addition, as shown in FIGS. 1 (a) and 2 (a), the insert 1 of this embodiment is a so-called negative electrode that can be used as a surface that exhibits a scooping function on both the upper surface 2 and the lower surface 3. It is a mold insert. Therefore, when cutting is performed using the lower cutting edge 5P, the lower surface 3 can be used as a scooping surface, and the upper surface 2 (upper mounting portion 26) can be used as a seating surface (mounting portion). That is, the insert 1 of the present embodiment has a configuration in which the upper surface 2 and the lower surface 3 have the same shape, and the upper and lower surfaces can be used for cutting. When cutting is performed using the upper cutting edge 5, the lower surface 3 (lower mounting portion 36) functions as a seating surface (mounting portion) for mounting on the holder 20. Hereinafter, the description regarding the upper surface 2 is also applied to the lower surface 3 unless otherwise specified.

  Hereinafter, each component of the insert 1 of this embodiment is demonstrated in detail.

  The upper surface 2 is a surface having a so-called scooping function for discharging chips, and inclines inward from the upper cutting edge 5 toward the lower surface 3 side and the rake surface 23 inclined toward the lower surface 3 side. It has a connecting surface 24 and a planar upper mounting portion 26 that is substantially perpendicular to the central axis S1. In this specification, “inward” means the inside of the insert 1 with respect to the upper cutting edge 5 and the side of the through hole 6. In the present embodiment, the rake face 23, the connecting face 24, and the upper mounting portion 26 are continuous. Thereby, since the area of the upper mounting part 26 can be ensured larger, the stability of mounting on the holder 20 can be improved. That is, for example, since the distance from the top portion 26t of the upper placement portion 26 to the corner cutting edge 51, that is, the overhang amount can be reduced, the bending moment received by the insert 1 can be reduced. As a result, it is possible to prevent the insert 1 from being damaged during the cutting process.

  The rake face 23 is a main part that exhibits the above-described rake function, and is continuous to the upper cutting edge 5 as shown in FIGS. 1 to 4, and as it goes from the upper cutting edge 5 toward the central axis S1. It is inclined at a rake angle β toward the lower surface 3 with respect to the vertical surface S1b. In the present embodiment, the rake face 23 is located over the entire circumference of the insert 1. The rake angle β is preferably set to 10 to 30 degrees.

  Specifically, the rake face 23 has a secondary rake face 23b and a main rake face 23a as shown in FIG. As shown in FIG. 4, the minor rake face 23 b is continuous with the minor cutting edge 52, and is inclined at the first rake angle β <b> 1 toward the lower surface 3 with respect to the vertical plane S <b> 1 b as it goes inward. The main rake face 23c is continuous with the main cutting edge 53 and is inclined toward the lower face 3 at the second rake angle β2 with reference to the vertical plane S1b as it goes inward. In FIG. 3, the region between the sub rake face 23b and the main rake face 23a is a gently curved connecting face.

  Further, as shown in FIGS. 5 and 6, the rake face 23 has at least a minor rake face 23b and a main rake face 23a having a cross-sectional shape obtained by cutting the inner end portion along the direction of the central axis S1. In the straddling region, it is linear or concave.

  Since the insert 1 of the present embodiment has the above-described configuration, the cutting chips generated by the sub-cutting blades 52 and the main cutting blades 53 of the upper cutting blade 5 to be described later are used as the rake face 23. Since it can be deformed linearly or concavely in the process of passing, it is possible to exhibit excellent chip dischargeability by stably curling the chips in the subsequent discharge process. In addition, as shown in FIG.6 (c), it is preferable that the shape of the above-mentioned cross section is a linear form or a concave form in the substantially whole area of the sub rake face 23b and the main rake face 23a. According to this, it becomes possible to exhibit the above-mentioned excellent chip discharging property under a wide range of depth of cut conditions. Moreover, it is preferable that the inner side edge part of the rake face 23 is linear in top view. This makes it possible to further improve the stability of the curl of the chips.

  Further, as shown in FIG. 3, the width W1 of the rake face 23 is preferably reduced from the first corner 21a side toward the second corner 22a side in a top view. That is, the relationship of W1a> W1b is satisfied. According to this, it becomes possible to exhibit the above-mentioned excellent chip discharging property under a wide range of depth of cut conditions.

  In the present embodiment, the rake face 23 further has a land surface 231 that is located at the end portion on the upper cutting edge 5 side and substantially parallel to the vertical surface S1b, as shown in FIG. As a result, the strength of the upper cutting edge 5 can be improved, and it can be suitably used even under so-called heavy cutting processing conditions. Note that the land surface 231 may be substantially parallel to the vertical surface S1b.

  As shown in FIG. 1 and the like, the upper placement portion 26 is a planar portion that is located inward of the rake face 23 on the upper surface 2.

  In the insert 1 of the present embodiment, the upper placement portion 26 has a polygonal shape, particularly a hexagonal shape, when viewed as a whole. Here, the polygonal shape is not limited to the case of having a vertex in a strict sense, but, for example, there is a slight connection between the sides, as long as it is necessary to obtain the predetermined effect of the present application. It is a concept that includes a curved configuration.

In addition, as shown in FIG. 1B, in the top view, the outer periphery of the through hole 26 is located inside a region surrounded by straight lines connecting the top portions 26t corresponding to the three main corners of the upper placement portion 26. ing. In the present specification, “top” refers to a portion corresponding to a vertex of a polygon, but may mean a region near the vertex surrounded by an elliptical dotted line as shown in the figure (hereinafter referred to as “the top”). The same applies to the above).

  Moreover, as shown in FIG.1 (b), it is preferable that the upper mounting part 26 has the three separation parts 26a spaced apart from each other. Accordingly, when the holder 20 is mounted, each of the three separating portions 26a of the insert 1 can be brought into contact with the corresponding contact surface (lower mounting surface) 24 of the holder 20 separately. It is possible to improve the stability of the mounting to 20. For example, even when the shape of the upper mounting portion 26 is deformed, for example, in the firing step of the manufacturing process of the insert 1, the three separating portions 26 a are independent from each other, and thus undergo another process such as polishing. In this case, the holder 20 can be brought into a relatively strong contact with the contact surface (lower mounting surface) 24 of the holder 20. Each of the three separation portions 26a has a triangular shape in plan view. In particular, it is preferable that one triangular top portion of the separation portion 26 a is closest to the main corner 21. This makes it possible to further improve the stability of mounting on the holder 20. When the upper cutting blade 5 is used for cutting, the lower mounting portion 36 on the lower surface 3 side is a surface that contacts the holder 20. The reverse is also true.

  Further, in the present embodiment, the upper placement portion 26 of the upper surface 2 is located on the lower surface 3 side (downward) from any part of the upper cutting edge 5 in a side view, as shown in FIG. Thereby, it is possible to reduce the collision of the chips generated by the upper cutting blade 5 with the upper placement portion 26 during the cutting process, and it is possible to suppress damage to the upper placement portion 26. Specifically, by setting a large distance between the upper cutting edge 5 and the upper placement portion 26 of the upper surface 2, a large space for generating chips can be secured, and chip discharge performance can be improved. Can do. Further, for example, in the firing process of the manufacturing process of the insert 1, when the shape of the upper placement portion 26 is deformed or the like, the upper placement portion 26 is positioned on the lower surface 3 side with respect to the upper cutting edge 5. However, it is difficult to shape by polishing, but by providing the upper mounting portion 26 with an inclination, it can be stably applied to the contact surface (lower mounting surface) 24 of the holder 20 without undergoing the polishing. It is possible to contact.

  Note that when viewing the lower mounting portion 36 on the lower surface 3 side, the end on the central axis S1 side is positioned on the upper surface 2 side with respect to the vertical surface S1b as compared with the end on the lower cutting blade 5P side. In other words, on the lower surface 3, the lower mounting portion 36 is located on the outer side in the outer peripheral region in the thickness direction of the insert 1 rather than in the central region. As a result, when the upper surface 2 is mounted on the holder 20 with the holder 20 facing forward in the rotation direction, the end on the lower cutting edge 5P side of the lower placement portion 36 is placed on the corresponding contact surface (lower surface) of the holder 20. (The mounting surface) 24 is brought into a relatively strong contact, and the end on the central axis S1 side can also be brought into a relatively weak contact with the corresponding contact surface (lower mounting surface) 24 of the holder 20. The stability of the mounting on the holder 20 can be improved by assisting the mounting on the holder 20 by the end on the lower cutting edge 5P side by the end on the central axis S1 side. In addition, it is preferable to set the inclination angle from the center area | region of the lower mounting part 36 to an outer peripheral area | region to 80 to 90 degree | times on the basis of central axis S1.

  As shown in FIGS. 1 to 4, the connecting surface 24 is located on the upper surface 2 between the rake face 23 and the upper placement portion 26, and is continuous with each of the rake face 23 and the upper placement portion 26. It is the part which is doing. The connecting surface 24 functions as a escape portion for chips passing through the rake surface 23 and is also a portion that contributes to ensuring a large area of the upper placement portion 26.

  As shown in FIG. 4, the connecting surface 24 is inclined toward the lower surface 3 at a connecting angle γ with reference to the vertical surface S1b as it goes inward. The joint angle γ of the joint surface 24 is larger than both the first rake angle β1 of the sub rake face 23b and the second rake angle β2 of the main rake face 23a. This makes it possible to effectively exhibit the functions as described above.

Note that the width W2 of the connecting surface 24 is, as shown in FIG.
It is preferable that the distance decreases from the 1a side toward the second corner 22a side. That is, the relationship of W2a> W2b is satisfied. According to this, it becomes possible to exhibit the above-mentioned excellent chip discharging property under a wide range of depth of cut conditions.

  The upper surface 2 may further have a recess 25 lower than the upper mounting portion 26 around the through hole 6 as shown in FIG. The three separation portions 26 a described above are separated from each other through the through hole 6 and the recess 25. Accordingly, each of the three separating portions 26a can be brought into contact with the corresponding contact surface (lower mounting surface) 24 of the holder 20 more reliably, so that the mounting to the holder 20 as described above is stable. It is possible to further improve the performance.

  As shown in FIGS. 1 and 2, the upper cutting edge 5 has a corner cutting edge 51, a secondary cutting edge 52, and a main cutting edge 53. Specifically, in the present embodiment, the upper cutting edge 5 is, for example, a first main corner (first corner) of the three main corners 21 as shown in FIGS. 1 (b) and 2 (a). The upper and lower surfaces 2, 3 as the distance from the corner cutting edge 51 and the corner cutting edge 51 increases from 21 a toward the first sub-corner (second corner) 22 a adjacent to the first main corner 21 a among the three sub-corners 22. The secondary cutting edge 52 that is inclined at the first inclination angle θ1 with respect to the vertical plane S1b perpendicular to the central axis S1 that passes through the secondary cutting edge 52, and the secondary cutting edge 52 that is based on the vertical plane S1b as the distance from the secondary cutting edge 52 increases. The main cutting edge 53 is inclined at the second inclination angle θ2 toward the lower surface 3 side. Thereby, the chip | tip produced | generated by the site | part of the sub cutting edge 52 and the main cutting edge 53 among the upper cutting edges 5 becomes convex shape as mentioned above. The first inclination angle θ1 of the auxiliary cutting edge 52 may be inclined upward with reference to the vertical plane S1b. Such an inclined configuration of each cutting edge region of the upper cutting edge 5 is coupled with the main corner 21 having the first inner angle α1 and the sub-corner 22 having the second inner angle α2 as described above, so that the insert 1 has a low cutting resistance. It becomes possible to combine excellent fracture resistance. Similarly, the corner cutting edge 51, the sub cutting edge 52, and the main cutting edge 53 are sequentially arranged from the first main corner (first corner) 21a toward the other adjacent second sub corner 22b among the three sub corners 22. have. That is, it has a configuration that can be used both ways as described above.

  As shown in FIG. 2, the corner cutting edge 51 is located at the intersection of the main corner side surface 41 and the upper surface 2, and prevents the upper cutting edge 5 from being lost due to the cutting force applied during the cutting process. Have In the present embodiment, the corner cutting edge 51 is parallel to the vertical plane S1b.

  In the present embodiment, the corner cutting edge 51 is preferably linear in a top view. Thereby, compared with the case where it is set as the corner R, since the width | variety of the front-end | tip of a blade edge in top view becomes large, high cutting-edge strength can be ensured. As a result, the thickness of the chips generated at the main corner 21 can be reduced, and chipping of the end of the work material, so-called edge chipping, can be effectively suppressed even when processing cast iron, which is a relatively brittle work material. It becomes possible to do. And it is preferable that it inclines at about 45 degree | times on the basis of the adjacent site | part (for example, subcutting blade 52) among the upper cutting blades 5. FIG. Thereby, the insert 1 can be used both sides.

  As shown in FIG. 2, the auxiliary cutting edge 52 is located on the corner cutting edge 51 side in the intersection of the first side face 42 and the upper surface 2, and as shown in FIG. It is a cutting blade having a role as the main cutting portions 5 a and 5 c together with the blade 53. At the same time, it is a cutting blade that functions as a so-called wiping blade mainly having a role of improving the accuracy of the finished surface 102 of the work material 100. In the present embodiment, as shown in FIGS. 2 and 3, the auxiliary cutting edge 52 is linear in both a top view and a side view.

Here, as shown in FIG. 2A, the auxiliary cutting edge 52 is inclined at the first inclination angle θ <b> 1 toward the lower surface 3 with respect to the vertical plane S <b> 1 b as it is away from the corner cutting edge 51. It is preferable. According to this, it becomes possible to reduce the cutting resistance of the auxiliary cutting edge 52 at the time of cutting. The first inclination angle θ <b> 1 of the sub cutting edge 52 is preferably set to 3 to 15 degrees toward the lower surface 3.

  As shown in FIG. 2, the main cutting edge 53 is located closer to the first auxiliary corner 22a than the auxiliary cutting edge 52 in the intersecting portion between the first side face 42 and the upper surface 2, and chips are cut during the cutting process. A cutting edge that has a major role in generation. The second inclination angle θ2 of the main cutting edge 53 is preferably set to 7 degrees to 19 degrees toward the lower surface 3. In the present embodiment, the main cutting edge 53 is concave in a side view. That is, as shown in FIG. 2A and FIG. 6A, the main cutting edge 53 is curved toward the lower surface 3 in a side view.

  Here, as shown in FIG. 2A, the first inclination angle θ <b> 1 of the auxiliary cutting edge 52 is preferably smaller than the second inclination angle θ <b> 2 of the main cutting edge 53. At the same time as having a high cutting edge strength on the secondary cutting edge 52 side, a low cutting resistance can be realized on the main cutting edge 53 side.

  In addition, it is preferable that the connection part of the main cutting edge 53 and the sub-cutting edge 52 is set so that it may become convex in side view, ie, it may curve in the range of R1.0-R10.0 to the upper surface 2 side.

  In addition, as shown to Fig.2 (a), the insert 1 of this embodiment is the thickness of insert 1 as it goes to the 1st subcorner (2nd corner) 22a side from the 1st main corner (1st corner) 21a side. As shown in FIG. 1B, the second inner angle α2 of the second corner 22a is larger than the first inner angle α1 of the first corner 21a. It is possible to ensure high cutting edge strength in the blade region.

  Similar to the upper cutting edge 5, the lower cutting edge 5P has a corner cutting edge 51P, a secondary cutting edge 52P, and a main cutting edge 53P, as shown in FIG.

  The side surface 4 is a surface that functions as a so-called escape portion for suppressing contact with the work material 100. In the present embodiment, as shown in FIG. 2, the side surface 4 is perpendicular to the upper surface 2 and the lower surface 3, that is, perpendicular to the central axis S1. Therefore, compared to an insert having a clearance angle between the side surface 4 and the upper surface 2 or the lower surface 3, the thickness of the insert 1 in the direction perpendicular to the central axis S1 can be ensured, resulting in excellent fracture resistance. Can be provided.

  Specifically, as shown in FIG. 2A, the side surface 4 connected to the hexagonal upper surface 2 is a first main body that is in the width direction, that is, the lateral direction in the side view of FIG. A main corner side surface 41, a first side surface 42, a sub-corner side surface 43, and a second side surface 44 are provided in this order from the corner 21a toward the second main corner 21b. The first side surface 42 and the second side surface 44 are both flat surfaces. The sub-corner side surface 43 is a curved surface, whereas the main corner side surface 41 is a flat surface. This corresponds to the fact that the corner cutting edge 51 located at the intersection of the main corner side surface 41 and the upper surface 2 is linear in top view. Similarly, as shown in FIG. 2C, the side surface 4 has a main corner side surface 45, a third side surface 46, and a sub-corner side surface 47 from the second main corner 21b in the width direction toward the third main corner 21c. And it has the 4th side 48 in order. In addition, the 3rd side surface 46 and the 4th side surface 48 in the 2nd main corner 21b have a function similar to the 3rd side surface 46 and the 4th side surface 48 in the 1st main corner 21a, respectively.

As shown in FIG. 1 etc., the through-hole 6 penetrates the upper surface 2 and the lower surface 3, and has a role which fixes the insert 1 to the holder 20 mentioned later. That is, the insert screw (fixing member) 30 is inserted into the through hole 6 and further screwed into the hole 204 a formed in the lower mounting surface 204 of the holder 20, thereby fixing the insert 1 to the holder 20 and cutting tool 10. Is formed. In addition, the central axis of the through-hole 6 exists at the same position as the central axis S1 of the insert body.

(Holder and cutting tool)
Next, the holder and the cutting tool according to the embodiment of the present invention will be described in detail with reference to FIGS. 7 to 10 by taking as an example a case where an insert having the same configuration as that of the above-described embodiment is used.

  As shown in FIG. 8, the cutting tool 10 of this embodiment generally includes a plurality of inserts 1 according to the above-described embodiment and a holder 20 to which the plurality of inserts 1 are mounted.

  As shown in FIG. 7, the holder 20 has a plurality of chip pockets 20 a at the outer peripheral tip. Each chip pocket 20a has a lower mounting surface 204, a first mounting surface 201, a second mounting surface 202, and a third mounting surface 203 at the outer peripheral portion as shown in FIG. 9A. As shown in FIG. 9B, the insert 1 is attached to the outer peripheral portion. That is, in this embodiment, when the cutting tool 10 rotates in the direction of arrow A in FIGS. 11 and 12, the insert 1 has the upper surface (rake face) 2 facing the front side of the arrow A that is the rotation direction, The main cutting edge 53 is mounted on the outermost periphery of the holder 20. The insert 1 used here is equivalent to that shown in FIG. 2C, and has a configuration in which the upper surface 2 and the lower surface 3 are reversed. That is, the order of the first side surface 42, the second side surface 44, and the third side surface 46 in the width direction is reversed with respect to the upper surface 2 and the lower surface 3.

  Specifically, in the cutting tool 10 of this embodiment, the insert 1 includes a polygonal upper surface 2, a lower surface 3 having the same shape as the upper surface 2, and an upper surface 2 and a lower surface, as shown in FIG. 3 and a side surface 4 having a first side surface 42, a second side surface 44, and a third side surface 46 in this order in the width direction. As shown in FIG. 9, the holder 20 includes a lower mounting surface 204 that is in contact with the lower surface 3 of the insert 1, a first mounting surface 201 that is in contact with the first side surface 42 of the insert 1, and the insert 1. The second mounting surface 202 is in contact with the second side surface 44, and the third mounting surface 203 is located with respect to the third side surface 46 of the insert 1 via the clearance D 1. According to this configuration, it is possible to ensure excellent mounting stability by bringing the insert 1 into contact with the two surfaces of the first mounting surface 201 and the second mounting surface 202 of the holder 20 with high accuracy. Further, the fact that the insert 1 rotates or the insert 1 moves toward the third mounting surface 203 due to the cutting force applied during the cutting process is located with respect to the third side face 46 of the insert 1 via the clearance D1. The third mounting surface 203 can be effectively regulated or suppressed. Here, the clearance D1 is a slight gap as shown in FIG. 9B, and is preferably larger than 0 mm and not larger than 0.2 mm. According to this, while being able to acquire the above-mentioned operation effect more effectively, when attaching insert 1 to holder 20, it is possible to make 3rd mounting surface 203 of holder 20 function as a composition for positioning. Become.

  Further, as shown in FIG. 9B and the like, the insert 1 is mounted on the holder 20 with the relative distance between the third side surface 46 and the third mounting surface 203 being variable by the fixing member 30. It is preferable that the variable distance D2 (not shown) is set larger than the clearance D1. According to this, the mounting property of the insert 1 by the first mounting surface 201 and the second mounting surface 202 of the holder 20 can be supplemented by the third mounting surface 203 or distributed to the third mounting surface 203. It is possible to ensure better mounting stability.

  Moreover, the holder 20 has the 1st mounting surface 201, the 2nd mounting surface 202, and the 3rd mounting surface 203 as mentioned above, About these detailed structures, it is as showing to Fig.9 (a). is there. Hereinafter, it demonstrates in order.

  The first mounting surface 201 includes a first contact portion 201 a that is a portion far from the second mounting surface 202 and a first non-contact portion 201 b that is a portion closer to the second mounting surface 202. ing. The first non-contact portion 201b has a first end portion 201b1 that is an end portion on the second mounting surface 202 side. Next, the second mounting surface 202 includes a second contact portion 202a that is a portion far from the first mounting surface 201 and a second non-contact portion 202b that is a portion closer to the first mounting surface 201. Have. The second non-contact portion 202b has a second end portion 202b1 that is an end portion on the first mounting surface 201 side. Next, the third mounting surface 203 has a third end portion 203 a 1 that is an end portion on the side far from the second mounting surface 202.

  Regarding the first mounting surface 201, it is preferable that the first side surface 42 of the insert 1 is in contact with the first contact portion 201 a of the first mounting surface 201. According to this, since the contact portion with the first mounting surface 201 can be moved away from the contact portion with the second mounting surface 202, the mounting stability of the insert 1 can be improved. The first side surface 42 of the insert 1 is preferably not in contact with the first end 201b1 of the first mounting surface 201 of the holder 20. According to this, even if the mounting accuracy of the insert 1 is low, for example, it is possible to suppress the contact portions from being close to each other, and thus it is possible to ensure mounting stability. The contact part means a part surrounded by a dotted line in FIG. 9B. The same applies to the following.

  Regarding the second mounting surface 202, the second side surface 44 of the insert 1 is preferably in contact with the second contact portion 202 a of the second mounting surface 202. According to this, since the contact portion with the second mounting surface 202 can be moved away from the contact portion with the first mounting surface 201, the mounting stability of the insert 1 can be improved. The second side surface 44 of the insert 1 is preferably not in contact with the second end 202 b 1 of the second mounting surface 202 of the holder 20. According to this, even if the mounting accuracy of the insert 1 is low, for example, it is possible to suppress the contact portions from being close to each other, and thus it is possible to ensure mounting stability.

  In addition, it is preferable that the area of the 1st contact part 201a is larger than the area of the 2nd contact part 202a.

  For the third mounting surface 203, as shown in FIG. 9 (b), when the third end 203a1, which is the end far from the second mounting surface 202, is viewed from the upper surface 2 side of the insert 1, It is preferable to be located on the second side surface 44 side from the midpoint of the third side surface 46 of the insert 1. According to this, since the third mounting surface 203 capable of supporting the mounting stability of the insert 1 by the first mounting surface 201 and the second mounting surface 202 can be made relatively small, the work material during cutting work or It becomes possible to suppress contact with chips.

  In addition, it is preferable that the 3rd mounting surface 203 has the convex part 203b (not shown) extended linearly in the direction which goes to the lower surface 3 side from the upper surface 2 side of the 3rd side surface 46 of the insert 1. FIG. In this case, the clearance D1 may be determined by the distance between the convex portion 203b and the third side face 46.

Next, when viewed from the upper surface 2 side of the insert 1, the portion where the first surface 201 a extending the first mounting surface 201 intersects the second surface 202 a extending the second mounting surface 202 is the first intersecting portion. 205. Here, the inner angle of the first intersecting portion 205 of the holder 20 is an obtuse angle. When viewed from the upper surface 2 side of the insert 1, the holder 20 is a first relief that is recessed inward from the first intersection 205 between the first mounting surface 201 and the second mounting surface 202. A part 205a is further provided. The first escape portion 205 a functions as a portion that suppresses contact between the insert 1 and the holder 20. In addition, about the 1st surface 201a and the 2nd surface 202a, as shown in FIG. 9, with the straight line which extended each upper side of the 1st mounting surface 201 and the 2nd mounting surface 202, the 1st surface 201a and the 2nd surface Each upper side of 202a is shown.

  Further, when viewed from the upper surface 2 side of the insert 1, a portion where the second surface 202 a extending the second mounting surface 202 intersects the third surface 203 a extending the third mounting surface 203 is the second intersecting portion 206. It is. Here, the inner angle of the second intersecting portion 206 is substantially a right angle. When viewed from the upper surface 2 side of the insert 1, the holder 20 is a second relief that is recessed inwardly from the second intersecting portion 206 between the second mounting surface 202 and the third mounting surface 203. It further has a portion 206a. The second relief portion 206 a functions as a portion that suppresses contact between the insert 1 and the holder 20.

  Next, as a mounting method, in this embodiment, the mounting screw (fixing member) 30 is inserted into each through hole 6 of the insert 1 to the hole 204a formed in the lower mounting surface 204 of the holder 20. By screwing, the inserts 1 are respectively fixed to the holders 20 as shown in FIG.

  As shown in FIG. 9B, the holder 20 has a hole 204 a that fits with the fixing member 30 in a part of the lower mounting surface 204 and when viewed from the upper surface 2 side of the insert 1. Furthermore, it is preferable that the central axis S1 of the through hole 6 is eccentric outward with respect to the central axis S3 of the hole portion 204a. Here, eccentricity means that the center axis S1 of the through-hole 6 and the center axis S3 of the hole 204a are positioned so as to deviate from each other, as shown in FIG. 9 (b). The distance is indicated by D3. And the direction of eccentricity means the linear direction which connects the central axis S1 of the through-hole 6, and the central axis S3 of the hole part 204a like the arrow shown in FIG.9 (b). According to this, by inserting the fixing member 30 into the through hole 6 of the insert 1 and the hole portion 204a of the holder 20 and screwing in, the fixing member 30 is inward with respect to the insert 1 with respect to the central axis S3 of the hole portion 204a. Since a force is applied in the direction, the first mounting surface 201 and the second mounting surface 202 of the holder 20 can be strongly brought into contact with each other. The eccentric distance D3 is preferably set to 0.23 mm to 0.47 mm.

  Here, when viewed from the upper surface 2 side of the insert 1, a portion where the first surface 201 a extending the first mounting surface 201 intersects the second surface 202 a extending the second mounting surface 202 is the first intersecting portion. 205. The direction of eccentricity is a linear direction connecting a portion closer to the second mounting surface 202 than the first intersecting portion 205 and the central axis S3 of the hole 204a.

  The eccentric distance D3 is preferably set larger than the clearance D1 described above. By making the eccentric distance D3 relatively large, the insert 1 can be mounted on the holder 20 in a variable state.

In this embodiment, the insert 1 is adjacent to the first main corner 21a of the upper cutting edge 5 on the basis of the parallel surface S2a parallel to the rotation axis S2 of the holder 20, as shown in FIG. The axial rake angle θa of the first main cutting portion 5a across the first sub-corner 22a is positive and the non-cutting portion 5b of the upper cutting blade 5 extending from the first sub-corner 22a to the adjacent second main corner 21b. The holder 20 is mounted in such a state that the axial rake angle θb is negative. Here, the first main cutting portion 5a includes a sub cutting edge 52 and a main cutting edge 53. In this embodiment, the axial rake angle θa is positive in both the sub cutting edge 52 and the main cutting edge 53. is there. For example, the axial rake angle of the sub cutting edge 52 is preferably set to 0 to 10 degrees, and the axial rake angle of the main cutting edge 53 is preferably set to 5 to 20 degrees. As for the axial rake angle θa, for a curved cutting edge such as the main cutting edge 53, a straight line L1 obtained by extending the starting point of the main cutting edge 53, that is, the tangent line at the end of the sub cutting edge 52 is used. To measure. Further, the axial rake angle θb is, for example, the non-cutting portion 5b.
The measurement may be performed using a straight line L2 obtained by extending the tangent at the starting point of the first sub-corner 22a.

  As shown in FIG. 10A, the insert 1 has a negative linear rake angle (not shown) connecting the first main corner 21 a and the second main corner 21 b of the upper cutting edge 5. In such a state, the holder 20 is mounted. In other words, the axial rake angle (not shown) as a whole including the first main cutting portion 5a and the non-cutting portion 5b is negative.

  As described above, the cutting tool 10 is configured by mounting the insert 1 on the holder 20. By rotating the cutting tool 10 in the direction of arrow A, various types of cutting such as face milling and plunge processing can be performed on the workpiece 100 as described later.

  For example, as shown in FIG. 11 (b), when performing face milling, the workpiece 100 is cut using the first main cutting portion 5 a of the insert 1 to form the cutting surface 101, and the secondary cutting is performed. The finished surface 102 can be formed by cutting the workpiece 100 using the cutting edge 52. At this time, the sub cutting edge 52 is set in a substantially parallel relationship with respect to the vertical surface S2b perpendicular to the rotation axis S2 of the holder 20.

<Manufacturing method of cut product>
Next, an embodiment of a method for manufacturing a cut product according to the present invention will be described in detail with reference to FIGS. 11 and 12.

  The manufacturing method of the cut workpiece described below generally includes a step of rotating the cutting tool 10 according to the above-described embodiment with reference to the rotation axis S2 of the holder 20, and an upper cutting edge 5 of the rotating cutting tool 10. A step of bringing the cutting tool 10 into contact with the surface of the work material 100, and a step of separating the cutting tool 10 from the work material 100.

(First embodiment)
A first embodiment of the method for manufacturing a cut product according to the present invention will be described in detail with reference to FIG. 11 taking so-called face milling as an example. The method for manufacturing a cut product according to the present embodiment includes the following steps (i) to (iii). In the following description, when the order in which the steps are executed is not specified, the order may be changed as appropriate.

  (I) A step of rotating the cutting tool 10 in the direction of arrow A about the rotation axis S2 of the holder 20 (cutting tool 10) as shown in FIG. Then, the cutting tool 10 is moved in the direction of the arrow B so as to approach the work material 100.

  (Ii) A step of bringing the upper cutting edge 5 of the rotating cutting tool 10 into contact with the surface of the work material 100 as shown in FIG. In this embodiment, this process has the following three processes.

    First, a step of moving the rotating cutting tool 10 in the direction of arrow C, which is a direction perpendicular to the rotation axis S2. Thus, the face milling can be performed on the work material 100 by moving in the direction perpendicular to the rotation axis S2.

Secondly, the first main cutting portion 5 a extending from the first main corner 21 a to the adjacent first sub-corner 22 a in the upper cutting edge 5 of the rotating cutting tool 10 is brought into contact with the surface of the work material 100. Process. Thereby, the work surface of the work material 100 cut in contact with the first main cutting portion 5a is
The cutting surface 101 is as shown in FIG.

    Thirdly, the sub cutting edge 52 located between the first main corner 21a and the second sub corner 22b in the upper cutting edge 5 of the rotating cutting tool 10 is in contact with the first main cutting portion 5a. The process of making it contact the work surface of the work material 100 formed by this. As a result, a portion of the work surface of the work material 100 cut by the first main cutting portion 5a in the above-described process that is left uncut without being directly cut by the first main cutting portion 5a is smoothed by the auxiliary cutting edge 52. As a result, a finished surface 102 as shown in FIG.

  (Iii) A step of moving the cutting tool 10 as it is in the direction of arrow C as shown in FIG. 11C to separate the cutting tool 10 from the work material 100.

  By going through each of the above steps, a cut product obtained by cutting the work material 100 into a desired shape as shown in FIG. 11C is manufactured.

  Moreover, when performing cutting continuously, the process which maintains the state which rotated the cutting tool 10, for example, and makes the upper cutting blade 5 of the cutting tool 10 contact the different location of the workpiece 100 is carried out. Repeat it.

  Here, when the main corner 21 of the upper cutting edge 5 used for cutting is worn, the unused upper cutting edge is rotated by rotating the insert 1 with respect to the central axis S1 of the through hole 6. 5 main corners 21 may be used. Alternatively, in the present embodiment, by rotating the rotation direction of the cutting tool 1 in the direction opposite to the arrow A, one main corner 21 of the insert 1 may be changed to a reverse-handed cutting process. As described above, by using each of the three main corners 21 for both the right hand and the left hand, it can be used as the insert 1 having substantially six main corners. In addition, by changing the rotation direction of the cutting tool 1 in the direction opposite to the arrow A, the secondary cutting edge 52 in the first main cutting portion 5a has a role as a cutting edge for forming the finished surface 102. Although the upper cutting edge 5 has been described above, the same applies to the lower cutting edge 5P.

  In addition, each above-mentioned process can be changed as follows.

  For example, in the step (i), the work material 100 may be rotated while the cutting tool 10 is fixed. In addition, since the cutting tool 10 and the work material 100 need only be relatively close to each other, for example, the work material 100 may be brought close to the cutting tool 10 in the reverse of the above-described steps. Similarly, in the step (iii), since the work material 100 and the cutting tool 10 need only be relatively distant from each other, for example, the work material 100 is kept away from the cutting tool 10 held at a predetermined position. May be. These changes can be similarly applied to the second embodiment described below.

(Second Embodiment)
Next, as a second embodiment of the method for manufacturing a cut product according to the present invention, a so-called plunge process (butting process) will be described as an example with reference to FIG. The method for manufacturing a cut product according to the present embodiment includes the following steps (i) to (iii). In the following description, when the order in which the steps are executed is not specified, the order may be changed as appropriate.

  (I) A step of rotating the cutting tool 10 in the direction of arrow A about the rotation axis S2 of the holder 20 (cutting tool 10) as shown in FIG. Then, the cutting tool 10 is moved in the direction of the arrow D so as to approach the work material 100.

  (Ii) A step of bringing the upper cutting edge 5 of the rotating cutting tool 10 into contact with the surface of the work material 100 as shown in FIG. In this embodiment, this process has the following three processes.

    First, a step of moving the rotating cutting tool 10 in the direction of arrow D, which is a direction parallel to the rotation axis S2. Thus, the plunge process can be performed on the work material 100 by moving in a direction parallel to the rotation axis S2.

    Secondly, the second main cutting portion 5 c extending from the first main corner 21 a to the adjacent second sub-corner 22 b in the upper cutting edge 5 of the rotating cutting tool 10 is brought into contact with the surface of the work material 100. Process. Thereby, the cut surface of the work material 100 cut in contact with the second main cutting portion 5c becomes a cut surface 101 as shown in FIG.

    Thirdly, the sub cutting edge 52 located between the first main corner 21a and the first sub corner 22a in the upper cutting edge 5 of the rotating cutting tool 10 is in contact with the second main cutting portion 5c. The process of making it contact the work surface of the work material 100 formed by this. As a result, a portion of the work surface of the work material 100 cut by the second main cutting portion 5c in the above-described process that is left uncut without being directly cut by the second main cutting portion 5c is smoothed by the sub cutting edge 52. As a result, a finished surface 102 as shown in FIG.

  (Iii) A step of moving the cutting tool 10 as it is in the direction of the arrow C and separating the cutting tool 10 from the work material 100 as shown in FIG.

  By passing through the above steps, a cut product obtained by cutting the work material 100 into a desired shape as shown in FIG.

  Moreover, what is necessary is just to perform the method similar to the content demonstrated in the above-mentioned 1st Embodiment, when performing cutting continuously. The same method as in the first embodiment described above may be performed even when the cutting edge portion used in the cutting process is worn.

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

  For example, the insert 1 of the above-described embodiment has a hexagonal shape (substantially hexagonal shape) as shown in FIG. 1B in plan view, but instead, various polygonal shapes such as a quadrangular shape and a pentagonal shape are used. It can be applied to any insert. Even in that case, the above-described effects can be exhibited by having the above-described configuration.

  Moreover, in the above-mentioned embodiment, although the shape of the upper surface 2 and the lower surface 3 of the insert 1 was made the same, it may replace with this and may make the upper surface 2 and the lower surface 3 into a different shape. For example, as a so-called single-sided insert for cutting with the upper cutting edge 5 of the upper surface 2, a configuration in which a large clearance angle of the side surface 4 corresponding to the upper cutting edge 5 can be secured. Such a configuration can be realized, for example, by reducing the area of the lower surface 3 with respect to the area of the upper surface 2.

Moreover, although the insert 1 of the above-mentioned embodiment was set as the structure which provides the connecting surface 24 between the rake face 23 and the upper mounting part 26 in the upper surface 2, it replaces with this and the rake face 23 and the upper mounting part 26 are provided. Between the upper cutting edge 5 and the central axis S1, a rising surface 24 that is inclined toward the upper surface 2 with respect to the vertical surface S1b may be used. According to this, when chip is discharged, it can be deformed into a curl shape with a small diameter, and chip discharge performance can be improved. The rising surface 24 is preferably provided at a portion corresponding to the three sub-corners 22. In this case, the rake face 23 is continuous with the upper placement portion 26 at a portion corresponding to the three main corners 21 and is connected to the upper placement portion 26 via the rising surface 24 at a portion corresponding to the three sub corners 22. It is continuous. The inclination angle is preferably set to 40 degrees to 70 degrees toward the upper surface 2 with respect to the vertical plane S1b.

  Moreover, in the insert 1 of the above-described embodiment, the surface shape of the rake face 23 was relatively smooth. Instead, a rake convex portion (see FIG. (Not shown). As a result, the generated chips can be curled relatively small by the rake convex part under the low cutting condition or the low feed condition, so that excellent chip discharging performance can be exhibited in finishing processing and the like. it can. In addition, it is preferable to arrange | position so that the whole rake convex part may be settled in the area | region of the rake face 23. FIG. Further, it is preferable that the highest portion of the rake convex portion is located at a position lower than the upper cutting edge 5.

  Moreover, in the insert 1 which concerns on the above-mentioned embodiment, although the structure which has the three separation parts 26a in which the upper mounting part 26 was mutually spaced apart was demonstrated, it replaced with this and as long as the same effect can be acquired. You may employ | adopt the structure which connects the three isolation | separation parts 26a in the mutually adjacent site | part.

  Further, although not specifically described in the insert 1 according to the above-described embodiment, the colors of the upper surface 2 and the lower surface 3 may be made different from each other. Specifically, for example, when the insert body is a cemented carbide showing a silver color, it is preferable to cover one of the upper surface 2 and the lower surface 3 with, for example, a titanium nitride (TiN) showing a gold color. In the negative-type insert, both the upper surface 2 and the lower surface 3 function as rake surfaces, which may cause an erroneous mounting of the insert. When either one of the upper surface 2 and the lower surface 3 is coated with TiN, the surface coated with TiN and the surface not coated have different colors. Therefore, each surface can be clearly distinguished, and misidentification when the insert 1 is mounted can be suppressed. Here, the coating target surface of either the upper surface 2 or the lower surface 3 does not need to cover the entire surface. The effect of can be obtained. The material used for the coating is not limited to TiN as long as the color difference between the upper surface 2 and the lower surface 3 can be recognized. For example, when the insert body is a cemented carbide, titanium carbonitride (TiCN) showing a bright reddish brown, titanium nitride aluminum (TiAlN) showing a dark reddish brown can also be employed.

  In the above-described embodiment, the direction of eccentricity is the linear direction connecting the portion closer to the second mounting surface 202 than the first intersecting portion 205 and the central axis S3 of the hole portion 204a. The linear direction connecting the first intersecting portion 205 and the central axis S3 of the hole portion 204a may be used. At this time, the area of the first contact part 201a is preferably set larger than the area of the second contact part 202a. According to this configuration, the insert 1 can be strongly abutted against the first abutting portion 201a having a larger area than the second abutting portion 202a by eccentricity, so that more excellent mounting stability can be obtained. .

  In the above-described embodiment, the third mounting surface 203 has the convex portion 203b extending linearly in the direction from the upper surface 2 side to the lower surface 3 side of the third side surface 46 of the insert 1. Instead, the inner angle of the second intersecting portion 206 may be set large while the third mounting surface 203 is planar. According to this configuration, the end of the third mounting surface 203 on the second mounting surface 202 side can be brought into linear contact with the third side surface 46 of the insert 1.

1 Cutting insert (insert)
2 Upper surface 21 Main corner 21a First main corner (first corner)
21b 2nd main corner 21c 3rd main corner α1 1st interior angle 22 Secondary corner 22a 1st secondary corner (2nd corner)
22b Second sub-corner 22c Third sub-corner α2 Second internal angle 23 Rake face β Rake angle 23a Corner rake face 23b Sub-rake face β1 First rake angle 23c Main rake face β2 Second rake angle 231 Land face 24 Connecting face γ Connecting Corner 25 Recess 26 Upper placement part (sitting surface)
26a Separation part 26t Top part 3 Lower surface 36 Lower mounting part (sitting surface)
4 side surface 41 main corner side surface 42 first side surface 43 sub corner side surface 44 second side surface 45 main corner side surface 46 third side surface 47 sub corner side surface 48 fourth side surface 5 upper cutting edge 51 corner cutting edge 52 sub cutting edge θ1 first inclination Angle 53 Main cutting edge θ2 Second inclination angle 5a First main cutting part (cutting part)
θa Axial rake angle of first main cutting part 5b Non-cutting part θb Axial rake angle of non-cutting part 5c Second main cutting part (cutting part)
5P Lower cutting edge 51P Lower corner cutting edge 52P Lower secondary cutting edge 53P Lower main cutting edge 6 Through hole 10 Cutting tool 20 Holder 20a Chip pocket 201 First mounting surface
201a 1st contact part
201b 1st non-contact part
201b1 first end
201c 1st surface 202 2nd mounting surface
202a 2nd contact part
202b Second non-contact portion
202b1 second end
202c 2nd surface 203 3rd mounting surface
203a1 third end
203a 3rd surface
203b Convex part 204 Lower mounting surface
204a hole
S3 Center axis of hole 205 First intersection
205a First escape portion 206 Second intersection
206a Second relief portion 30 Fixing member (mounting screw)
DESCRIPTION OF SYMBOLS 100 Work material 101 Cutting surface 102 Finish surface S1 Central axis of cutting insert S1a Parallel surface parallel to S1 S1b Vertical surface perpendicular to S1 S2 Rotation axis of a cutting tool (holder) S2a Parallel surface parallel to S2 S2b S2 perpendicular to S2 Vertical plane S3 Center axis of holder hole

Claims (22)

Cutting inserts,
A holder to which the cutting insert is mounted using a fixing member,
The cutting insert is
A polygonal top surface;
A lower surface having the same shape as the upper surface;
A side surface located between the upper surface and the lower surface and having a first side surface, a second side surface, and a third side surface in the width direction;
The holder is
A lower mounting surface in contact with the lower surface of the cutting insert;
A first mounting surface in contact with the first side surface of the cutting insert;
A second mounting surface in contact with the second side surface of the cutting insert;
A cutting tool having a third mounting surface located via a clearance D1 with respect to the third side surface of the cutting insert.   The cutting insert is mounted on the holder in a state in which the relative distance between the third side surface and the third mounting surface is variable by the fixing member, and the variable distance D2 is larger than the clearance D1. The cutting tool according to claim 1, which is set. The cutting insert further has a through hole penetrating between the upper surface and the lower surface,
The holder has a hole that is fitted to the fixing member in a part of the lower mounting surface;
The cutting tool according to claim 1 or 2, wherein when viewed from the upper surface side of the cutting insert, the central axis of the through hole is eccentric outward with respect to the central axis of the hole. The first mounting surface and the second mounting surface are spaced apart from each other;
When viewed from the upper surface side of the cutting insert, a first surface that extends the first mounting surface and a second surface that extends the second mounting surface constitute a first intersecting portion,
The cutting tool according to claim 3, wherein the direction of the eccentricity is a linear direction connecting the central axis of the hole and the first intersecting portion. The first mounting surface and the second mounting surface are spaced apart from each other;
When viewed from the upper surface side of the cutting insert, a first surface that extends the first mounting surface and a second surface that extends the second mounting surface constitute a first intersecting portion,
4. The cutting tool according to claim 3, wherein the direction of the eccentricity is a linear direction connecting a portion closer to the second mounting surface than the first intersecting portion and the central axis of the hole portion.   The cutting tool according to any one of claims 3 to 5, wherein the eccentric distance D3 is set larger than the clearance D1.   The said 1st side surface of the said cutting insert is contact | abutting to the 1st contact part which is a site | part far from the said 2nd mounting surface among the said 1st mounting surfaces of the said holder. The cutting tool according to Crab.   The first side surface of the cutting insert further includes a first non-contact portion that is a portion of the first mounting surface of the holder that is closer to the second mounting surface, and the first non-contact portion. The cutting tool of Claim 7 which is not contact | abutting to the 1st end part which is an edge part of the said 2nd mounting surface side among these. The said 2nd side surface of the said cutting insert is contact | abutting to the 2nd contact part which is a site | part far from the said 1st mounting surface among the said 2nd mounting surfaces of the said holder. The cutting tool according to Crab.   The second side surface of the cutting insert further includes a second non-contact portion that is a portion of the second mounting surface of the holder that is closer to the first mounting surface, and the second non-contact portion. The cutting tool of Claim 9 which is not contact | abutting to the 2nd end part which is an edge part of the said 1st mounting surface side among these.   The cutting tool according to claim 9 or 10, wherein an area of the first contact portion is larger than an area of the second contact portion.   When viewed from the upper surface side of the cutting insert, the third end of the third mounting surface of the holder, which is the end farther from the second mounting surface, is the third side surface of the cutting insert. The cutting tool in any one of Claims 1-11 located in the 2nd side surface side rather than a midpoint. The third mounting surface of the holder has a convex portion extending linearly in a direction from the upper surface side to the lower surface side of the third side surface of the cutting insert,
The cutting tool according to any one of claims 1 to 12, wherein the clearance D1 is a distance between the convex portion and the third side surface. The first mounting surface and the second mounting surface are spaced apart from each other;
When viewed from the upper surface side of the cutting insert, a first surface that extends the first mounting surface and a second surface that extends the second mounting surface constitute a first intersecting portion, and the first The cutting tool according to any one of claims 1 to 13, wherein an internal angle of the intersecting portion is an obtuse angle.   When viewed from the upper surface side of the cutting insert, the holder has a first relief portion that is recessed inward from the first intersecting portion between the first mounting surface and the second mounting surface. The cutting tool according to claim 14, further comprising: The second mounting surface and the third mounting surface are spaced apart from each other;
When viewed from the upper surface side of the cutting insert, a second intersecting portion is formed in which a second surface extending from the second mounting surface and a third surface extending from the third mounting surface intersect, The cutting tool according to any one of claims 1 to 15, wherein an internal angle of the intersecting portion is substantially a right angle.   When viewed from the upper surface side of the cutting insert, the holder has a second relief portion that is recessed inward from the second intersecting portion between the second mounting surface and the third mounting surface. The cutting tool according to claim 16, further comprising: The cutting insert is
The upper surface alternately includes two or more main corners having a first inner angle and two or more sub-corners having a second inner angle larger than the first inner angle,
The cutting tool according to claim 1, wherein the two or more main corners include the first corner, and the two or more sub-corners include the second corner.   The upper cutting edge has a first sub-corner and a second sub-adjoining from the first main corner of the two or more main corners to the first main corner of the two or more sub-corners. The cutting tool according to claim 18, comprising a corner cutting edge, a secondary cutting edge, and a main cutting edge in order toward each of the corners. A step of rotating the cutting tool according to any one of claims 1 to 19 on the basis of a rotation axis of the holder;
Contacting the upper cutting edge of the rotating cutting tool with the surface of the work material;
And a step of separating the cutting tool from the work material. The step of rotating the cutting tool according to claim 19 on the basis of the rotation axis of the holder;
Contacting the upper cutting edge of the rotating cutting tool with the surface of the work material;
Separating the cutting tool from the work material, and
The step of bringing the upper cutting edge into contact with the surface of the work material,
Moving the rotating cutting tool in a direction perpendicular to the axis of rotation;
A step of bringing the first main cutting portion across the first sub-corner adjacent to the first main corner out of the upper cutting edge of the rotating cutting tool into contact with the surface of the work material;
Of the upper cutting edge of the rotating cutting tool, a sub cutting edge located between the first main corner and the second sub corner is formed by contacting with the first main cutting portion. And a step of contacting the work surface of the work material. The step of rotating the cutting tool according to claim 19 on the basis of the rotation axis of the holder;
Contacting the upper cutting edge of the rotating cutting tool with the surface of the work material;
Separating the cutting tool from the work material, and
The step of bringing the upper cutting edge into contact with the surface of the work material,
Moving the rotating cutting tool in a direction parallel to the rotation axis;
A step of bringing the second main cutting portion across the second sub-corner adjacent to the first main corner out of the upper cutting edge of the rotating cutting tool into contact with the surface of the work material;
Of the upper cutting edge of the rotating cutting tool, a sub cutting edge located between the first main corner and the first sub corner is formed by contacting with the second main cutting portion. And a step of contacting the work surface of the work material.

Images