WO2021200400A1 - Blade tip exchangeable cutting tool and tool body - Google Patents

Abstract

This tool body comprises a main body section that is rotatable about a center axis, and an insert attachment seat that is located on an outer circumference section of the main body section and to which can be attached a cutting insert for cutting a workpiece. The main body section has a coolant flow path that causes a coolant to flow therein from the tool base end side of the main body section and that jets the coolant from a location near the insert attachment seat. The coolant flow path has: an inlet flow path that is located at a base end section of the main body section; a coolant pooling section that is joined to the tool tip side of the inlet flow path and that has a flow path diameter greater than that of the inlet flow path; and a plurality of jetting flow paths that extend from the coolant pooling section toward the insert attachment seat. The coolant pooling section has an inclined wall surface that is inclined further toward the inside in the radial direction as the inclined wall surface advances toward the tool tip side, and the jetting flow paths are open in the inclined wall surface.

Description

Cutting tool with replaceable cutting edge and tool body

The present invention relates to a cutting tool with a replaceable cutting edge and a tool body.
The present application claims priority based on Japanese Patent Application No. 2020-664868 filed in Japan on March 31, 2020, the contents of which are incorporated herein by reference.

In the machining of stainless steel and difficult-to-cut materials, it is important to process chips and cool the cutting edge (cutting insert) in order to extend the life of the cutting tool. Therefore, a configuration is known in which coolant is injected toward the cutting insert. For example, Patent Document 1 discloses that a plurality of openings for injecting coolant toward the tip of a cutting insert are provided.

Special Table 2017-526544

However, when the coolant flow path is branched inside the tool body as described in Patent Document 1 in order to install a plurality of openings in the vicinity of the cutting insert, the coolant pressure is reduced by the branching and the plurality of openings are formed. The pressure of the coolant injected from is likely to be uneven. Therefore, it is difficult to accurately supply the coolant to the tip of the cutting insert with sufficient pressure.

One aspect of the present invention has been made in view of the above-mentioned problems of the prior art, and is a cutting tool and a tool having a replaceable cutting edge, which can simultaneously improve the processability of chips and the cooling property of a cutting insert. The purpose is to provide the main body.

In order to solve the above problems and achieve such an object, the tool body of the cutting tool with a replaceable cutting edge of the present invention rotates around the axis of the central axis to cut the object to be cut. A main body that can rotate around the central axis, and an insert mounting seat that is located on the outer periphery of the main body and can be attached with a cutting insert for cutting the object to be cut. The main body has a coolant flow path that allows coolant to flow in from the tool base end side of the main body and injects the coolant from the vicinity of the insert mounting seat, and the coolant flow path is the main body. An inlet flow path located at the base end portion of the portion, a coolant pool portion connected to the tool tip side of the inlet flow path and having a flow path diameter larger than that of the inlet flow path, and an insert mounting seat from the coolant pool portion. The coolant pool portion has a plurality of injection flow paths extending toward the inside of the tool, and the injection flow path is opened in the inclined wall surface. It is characterized by being.

In the tool body having the above configuration, the coolant pool portion has an inclined wall surface that is radially inward toward the tool tip side, so that the tool is obliquely outward from the inclined wall surface and toward the tool tip side. It is easy to secure the meat of the main body, and it is easy to arrange the insert mounting seat at this position. Then, the jet flow path can be shortened by extending the jet flow path from the sloped wall surface to the insert mounting seat located on the radial side of the inclined wall surface and diagonally toward the tool tip side. Since the flow path resistance of the jet flow path acting on the coolant is reduced, jetting can be performed without lowering the pressure of the coolant.
Further, since the jet flow path can be connected to the inclined wall surface from the front, the range in which the direction in which the jet flow path extends from the coolant pool portion can be adjusted becomes large. Thereby, the injection direction of the coolant can be easily adjusted without bending the injection flow path. Since the coolant can be accurately supplied to the cutting insert with sufficient pressure, chips can be efficiently removed and the cooling performance of the cutting insert can be improved.

Further, in the tool body according to one embodiment of the present invention, the coolant pool portion is formed around the central axis around the central axis, and the wall surface region gradually reduces in diameter from the tool base end side toward the tool tip side. The inclined wall surface having the above and the injection flow path opens may be configured to be located in the wall surface region.

According to this configuration, in the tool body in which the inner wall surface of the coolant pool portion on the tool tip side has a substantially conical shape and a plurality of insert mounting seats are lined up in the circumferential direction, the jet flow path described above is provided at a position close to each insert mounting seat. Can be formed. Since the plurality of jet flow paths toward the respective insert mounting seats are jet flow paths having the same jet performance as each other, the coolant can be supplied to the plurality of cutting inserts at an equal pressure.

Further, in the tool body according to the embodiment of the present invention, the coolant pool portion has a first wall surface area whose diameter gradually increases from the tool base end side toward the tool tip side and a tool tip side of the first wall surface area. The inclined wall surface having a second wall surface region in which the diameter is gradually reduced from the end portion of the tool toward the tip end side of the tool and the injection flow path opens is also configured to be located in the second wall surface region. good.

According to this configuration, the coolant pool has the largest diameter in a part (center) in the axial direction. By having the first wall surface region, it is possible to secure the wall thickness on the base end side of the tool body while securing the volume of the coolant pool portion. The volume of the coolant pool can be increased while suppressing the lack of rigidity on the base end side of the tool body.

Further, in the tool body according to the embodiment of the present invention, the jet flow path may be configured to extend from the connection portion with the coolant pool portion to the rear side in the tool rotation direction.

According to this configuration, it becomes easy to inject coolant from the front side in the tool rotation direction with respect to the cutting insert.

Further, in the tool main body according to the embodiment of the present invention, the jet flow path may be configured to extend linearly from the inclined wall surface toward the outer peripheral surface of the main body portion.

According to this configuration, the coolant can be accurately supplied at a sufficient pressure without lowering the injection pressure.

Further, in the tool main body according to one embodiment of the present invention, the main body portion has a plurality of recesses on the outer peripheral portion on the tool tip side, and the insert mounting seat is formed on a part of the inner wall surface of each recess. In addition, the jet flow path may be opened on the inner wall surface on the front side in the tool rotation direction with respect to the insert mounting seat.

As a result, when the object to be cut is cut by the cutting insert, the coolant can be injected toward the chips generated in front of the cutting insert in the tool rotation direction, so that the generated chips can be quickly removed. Can be done.

Further, in the tool main body according to one embodiment of the present invention, the main body portion may be configured to be manufactured by a 3D printer.

In the present invention, since the main body has a plurality of jet flow paths extending from the coolant pool to the outer peripheral surface, by using a 3D printer, a complicated shape can be easily formed as compared with the case of manufacturing by injection molding or cutting. Can be made.

The cutting tool with a replaceable cutting edge of the present invention is characterized by including the tool body and a plurality of cutting inserts that are detachably attached to the tool body.
According to the cutting tool with a replaceable cutting edge provided with the tool body described above, it is possible to improve the processability of chips generated by the cutting insert and to improve the cooling efficiency of the cutting insert.

According to the present invention, it is possible to provide a cutting tool with a replaceable cutting edge and a tool body capable of improving the processability of chips and the cooling efficiency of a cutting insert.

FIG. 1 is a perspective view showing an embodiment of a cutting tool with a replaceable cutting edge of the present invention. FIG. 2 is a side view showing the configuration of a cutting tool with a replaceable cutting edge. FIG. 3 is a perspective view showing a configuration of a cutting insert of the cutting tool with a replaceable cutting edge of the present invention. FIG. 4 is a plan view of the cutting tool with a replaceable cutting edge of the present invention as viewed from the tip side. FIG. 5 is a cross-sectional view showing the configuration of a cutting tool with a replaceable cutting edge. FIG. 6 is a perspective view showing the position of the jet flow path formed in the tool body in the vicinity of the cutting insert. FIG. 7 is a side view showing the shape of the jet flow path. FIG. 8 is a view of the jet flow path viewed from the inlet opening side. FIG. 9 is a diagram showing how coolant is injected from the tool body toward the cutting insert.

Hereinafter, a cutting tool with a replaceable cutting edge according to an embodiment of the present invention will be described.
In each of the following drawings, in order to make each component easy to see, the scale of the dimensions may be different depending on the component.

(Replaceable cutting tool)
FIG. 1 is a perspective view showing an embodiment of the cutting tool 100 with a replaceable cutting edge of the present invention. FIG. 2 is a side view showing the configuration of the cutting tool 100 with a replaceable cutting edge of the present invention. FIG. 3 is a perspective view showing the configuration of the cutting insert 10 of the cutting tool 100 with a replaceable cutting edge of the present invention. FIG. 4 is a plan view of the cutting tool 100 with a replaceable cutting edge as viewed from the tip side. FIG. 5 is a cross-sectional view showing the configuration of the cutting tool 100 with a replaceable cutting edge. FIG. 6 is a perspective view showing the position of the jet flow path 19 formed in the tool body 11 in the vicinity of the cutting insert 10. FIG. 7 is a side view showing the shape of the jet flow path 19. FIG. 8 is a view of the jet flow path 19 as viewed from the inlet opening 19a side. FIG. 9 is a diagram showing how the coolant 25 is injected from the tool body 11 toward the cutting insert 10.

As shown in FIGS. 1 to 5, the cutting tool 100 having a replaceable cutting edge includes a tool body 11 and a plurality of cutting inserts 10. The plurality of cutting inserts 10 are detachably attached to the plurality of insert mounting seats 12 formed on the outer peripheral portion on the tip end side of the tool body 11 by mounting bolts 13, respectively.

In the cutting tool 100 with a replaceable cutting edge, the base end side (upper side in FIG. 1) of the tool body 11 is connected to the spindle of the tool machine. The cutting tool 100 with a replaceable cutting edge rotates around the central axis O shown in FIG. 1 in the tool rotation direction T, so that the object to be cut is cut by a plurality of cutting inserts 10.

(Tool body)
As shown in FIGS. 1 and 2, the tool main body 11 has a main body portion 110 that can rotate around the central axis O, and a plurality of insert mounting seats 12 located on the outer peripheral portion of the main body portion 110. The tool body 11 of the present embodiment is manufactured by using a 3D printer, and is manufactured by laminating while melting and laminating the powder material of the raw material metal of the tool body 11.
The material and manufacturing method of the tool body 11 are not limited to those described above, and the tool body 11 may be manufactured by cutting or injection molding.

As shown in FIGS. 1 and 2, the main body 110 has a larger diameter at the tool tip side (lower side in FIG. 1) than at the tool base end side, and has a substantially outer shape centered on the central axis O. It is formed in a disk shape. In the substantially disk-shaped main body 110, the surface on the tool base end side is referred to as the base end surface 11b, and the surface on the tool tip side is referred to as the tip surface 11a. A plurality of tip pockets (recesses) 14 recessed inward in the radial direction of the main body 110 are formed on the outer peripheral portion of the main body 110 on the tool tip side at intervals in the circumferential direction. As shown in FIG. 2, the tip pocket 14 has a first recess 14A extending from the tool tip side toward the tool base end side, and a second recess 14B communicating with the tool tip side of the first recess 14A. Of the inner wall surface of the tip pocket 14, the inner wall surface (wall surface) 14b of the second recess 14B facing the tool rotation direction T is formed with an insert mounting seat 12 to which the cutting insert 10 is mounted.

In the present embodiment, a plurality of (four) chip pockets 14 are formed in the main body 110 at equal intervals in the circumferential direction. One insert mounting seat 12 is formed in each of the second recesses 14B of the four chip pockets 14.

(Cutting insert)
FIG. 3 is a perspective view showing the configuration of the cutting insert 10 in the present embodiment.
As shown in FIG. 3, the cutting insert 10 is formed in a polygonal plate shape by a hard material such as cemented carbide. In the case of the present embodiment, it is formed in the shape of a hexagonal plate in which acute-angled angles and obtuse-angled angles are alternately arranged around the insert central axis C. The cutting insert 10 includes two hexagonal surfaces 2 facing opposite sides and six side surfaces 3 arranged around the two hexagonal surfaces 2. The lengths of each side of the hexagonal surface 2 when viewed from the axial direction of the insert central axis C are substantially equal. The cutting insert 10 of the present embodiment is a negative type cutting insert, and the plurality of side surfaces 3 have a flat shape parallel to the insert central axis C.
Here, the axial direction of the insert central axis C refers to the direction from one hexagonal surface 2 to the other hexagonal surface 2 along the insert central axis C.

A mounting hole 4 is formed in the center of the cutting insert 10 so as to penetrate the cutting insert 10 in the axial direction of the insert central axis C. The mounting holes 4 are opened in a pair of hexagonal surfaces 2 perpendicular to the insert central axis C, respectively. A mounting bolt 13 for mounting the cutting insert 10 to the insert mounting seat 12 on the tool body 11 side is inserted into the mounting hole 4.

On the hexagonal surface 2, an annular flat surface portion 2a perpendicular to the insert central axis C is formed around the opening of the mounting hole 4. A curved surface portion 5A is formed around the flat surface portion 2a viewed from the axial direction of the insert central axis C. The flat surface portion 2a is located closer to the central portion in the axial direction of the insert central axis C than the curved surface portion 5A. That is, on the hexagonal surface 2 of the cutting insert 10, the flat surface portion 2a is located at a position lower than the curved surface portion 5A.

The cutting insert 10 has a plurality of (six) corner portions C1 and C2 on the outer peripheral portion thereof. The first corner portion C1 and the second corner portion C2 are alternately arranged in the circumferential direction of the cutting insert 10. The sandwiching angle of the first corner portion C1 seen from the axial direction of the insert central axis C is smaller than the sandwiching angle of the second corner portion C2. On the two hexagonal surfaces 2, a cutting edge 5 is formed at a position corresponding to each first corner portion C1. Specifically, three cutting blades 5 are formed on each of the two hexagonal surfaces 2. The cutting edge 5 has a concave rake face 5a. The rake face 5a is a part of the curved surface portion 5A formed around the flat surface portion 2a of the hexagonal surface 2 and is composed of a portion corresponding to the first corner portion C1.

The rake face 5a has a concave curved surface in which the first corner portion C1 side located on the outer peripheral portion of the cutting insert 10 protrudes most outward in the axial direction and dents inward in the axial direction toward the insert central axis C side. There is. Therefore, the rake face 5a of the cutting edge 5 can curl the tip of the chip 30 generated by scooping up the object to be cut. As a result, it is possible to prevent the chips 30 from coming into contact with the cutting surface of the work piece and the chips 30 from being sandwiched between the cutting insert 10 and the cutting surface of the work piece.

The cutting insert 10 is fixed to the insert mounting seat 12 of the tool body 11 by screwing the mounting bolt 13 inserted through the mounting hole 4 into the screw hole provided in the insert mounting seat 12. The cutting insert 10 is attached to the tool body 11 with one of the pair of hexagonal surfaces 2 facing forward in the tool rotation direction T. The cutting insert 10 is attached to the tool body 11 in a posture in which the front and back hexagonal surfaces 2 are parallel to the radial direction of the tool body 11.

(Tool body)
Next, the configuration of the tool body 11 will be described in detail.
As shown in FIGS. 1 and 5, the tool body 11 of the present embodiment has a plurality of keyways 1A provided so as to open in the base end surface 11b. The tool body 11 has a coolant flow path 7 inside the tool body 11. The tool body 11 has a clamp bolt insertion hole 8 that opens in the tip surface 11a and extends in the axial direction of the central axis O. The coolant flow path 7 and the clamp bolt insertion hole 8 are connected to each other in the axial direction of the central axis O inside the tool body 11. The center of the tool body 11 has a shape penetrated by a coolant flow path 7 communicating with the central axis O in the axial direction and a clamp bolt insertion hole 8.
Here, the axial direction of the central axis O refers to the direction from the distal end surface 11a to the proximal end surface 11b along the central axis O, or the direction from the proximal end surface 11b to the distal end surface 11a along the central axis O.

(Key groove)
As shown in FIGS. 1 and 2, the key groove 1A is a concave groove that opens in the base end surface 11b and extends in the radial direction that intersects the central axis O. In this embodiment, the tool body 11 has four keyways 1A. The four keyways 1A are arranged radially around the central axis O at equal angles to each other. The radial inner end of each keyway 1A communicates with the coolant flow path 7 that opens in the center of the base end surface 11b. The radial outer end of the keyway 1A is open to the outer peripheral surface 110a of the main body 110.

A key at the tip of an arbor (not shown) is fitted into the key groove 1A. The tool body 11 is attached to the tip of the arbor by screwing the clamp bolt 9 (FIG. 5) inserted from the clamp bolt insertion hole 8 on the tool tip side into the tip of the arbor. The tool body 11 is attached to the spindle of the machine tool via an arbor.

(Coolant flow path)
As shown in FIG. 5, the coolant flow path 7 includes an inlet flow path 15 that opens to the base end surface 11b of the main body 110, a coolant pool 16 that connects to the tool tip side of the inlet flow path 15, and a coolant pool 16. It has a plurality of jet flow paths 19 that communicate with each other. The coolant flow path 7 is a flow path for injecting the coolant flowing in from the tool base end side of the main body 110 from the vicinity of the insert mounting seat 12.

The inlet flow path 15 extends in the axial direction of the central axis O with the central axis O as the center. One end side of the inlet flow path 15 opens in the center of the base end surface 11b, and the other end side is connected to the coolant pool portion 16.
The inlet flow path 15 penetrates the portion of the main body 110 on the tool base end side in the axial direction of the central axis O. The inlet flow path 15 opens circularly in the center of the base end surface 11b and extends in the axial direction of the central axis O with a uniform inner diameter toward the tool tip side. A radial inner opening 15a of the keyway 1A opens on the inner peripheral surface of the inlet flow path 15 located on the tool base end side.

The coolant reservoir 16 has a shape that is rotationally symmetric with respect to the central axis O. The coolant collecting portion 16 has a coolant accommodating space K for storing the coolant supplied toward the cutting insert 10. The coolant collecting portion 16 has a diameter (flow path diameter) larger than that of the portion 15b located on the tool tip side of the key groove 1A of the inlet flow path 15. With this configuration, the coolant reservoir 16 can secure a sufficient volume.

The inner wall surface of the coolant reservoir 16 has a substantially bicone shape in which the maximum diameter side of two substantially cones having the same shape are opposed to each other in the axial direction of the central axis O. The inner wall surface of the coolant pool portion 16 has a shape in which the diameter is reduced from the central portion of the central axis O having the maximum diameter in the axial direction toward the tool tip side and the tool base end side, respectively.
The central portion in the axial direction of the central axis O means a portion corresponding to the center in the length along the axial direction of the central axis O of the tool body 11.

That is, the coolant collecting portion 16 has a first wall surface region R1 whose diameter gradually increases from the base end surface 11b side toward the tip end surface 11a side, and a base end surface 11b from the end portion of the first wall surface region R1 on the base end surface 11b side. It has a second wall surface region R2 that gradually shrinks in diameter toward the side.

The coolant pool 16 has a base end side peripheral wall surface 16a, a tip end side peripheral wall surface 16b, and a bottom surface 16c that partition the coolant accommodating space K in the axial direction of the central axis O. The coolant pool portion 16 has the maximum diameter at the top portion 16d formed by intersecting the proximal end side peripheral wall surface 16a and the distal end side peripheral wall surface 16b at the central position in the axial direction of the central axis O.

The peripheral wall surface 16a on the base end side is connected to the end portion on the tool tip side of the inlet flow path 15 at the end portion on the tool base end side. The base end side peripheral wall surface 16a is located in the first wall surface region R1 whose diameter increases from the tool base end side toward the tip end surface 11a (top 16d) side.

The tip side peripheral wall surface 16b is connected to the tool tip side end portion (top 16d) of the base end side peripheral wall surface 16a at the end portion on the tool base end side. The peripheral wall surface 16b on the tip end side is located in the second wall surface region R2 whose diameter decreases from the base end side of the tool toward the tip end surface 11a side.

The bottom surface 16c extends inward in the radial direction of the main body 110 from the tool tip side end of the tip side peripheral wall surface 16b. The bottom surface 16c is annular when viewed from the axial direction of the central axis O. The bottom surface 16c is inclined toward the tool base end side in the radial direction of the main body portion 110 (toward the central axis O) from the end portion connected to the front end side peripheral wall surface 16b. The diameter of the bottom surface 16c is reduced toward the base end surface 11b side. The bottom surface 16c is arranged at a position overlapping the front end side peripheral wall surface 16b when viewed from the radial direction of the main body 110.

With the above configuration, the coolant pool portion 16 has the deepest depth from the connection position with the inlet flow path 15 at the connection position 16g between the front end side peripheral wall surface 16b and the bottom surface 16c. A clamp bolt insertion hole 8 opens in the center of the bottom surface 16c.

In the main body 110 of the present embodiment, a plurality of jet flow paths 19 extending linearly from the coolant collecting portion 16 toward the insert mounting seat 12 are formed in the vicinity of each insert mounting seat 12 formed on the outer peripheral portion. There is.

One end side of the jet flow path 19 opens to the inclined wall surface 16f closest to each insert mounting seat 12 among the peripheral wall surface 16b on the tip end side of the coolant pool portion 16. The other end side of the jet flow path 19 is the outer peripheral surface 110a of the main body 110 and opens to the inner wall surface 14a of the chip pocket 14.
In the tool body 11 of the present embodiment, the coolant pool portion 16 has an inclined wall surface 16f that is radially inward toward the tool tip side, so that the coolant pool portion 16 is radially outward and toward the tool tip side from the inclined wall surface 16f. It is easy to secure the meat of the tool body in the oblique direction, and it is easy to arrange the insert mounting seat 12 at this position. Then, the jet flow path 19 can be shortened by extending the jet flow path 19 from the sloped wall surface 16f to the insert mounting seat 12 located on the radial side of the inclined wall surface 16f and diagonally toward the tool tip side. As a result, the flow path resistance of the injection flow path 19 acting on the coolant is reduced, so that the coolant can be injected without lowering the pressure.

Further, since the jet flow path 19 can be connected to the inclined wall surface 16f from the front, the range in which the direction in which the jet flow path 19 extends from the coolant pool portion 16 can be adjusted becomes large. Thereby, the injection direction of the coolant can be easily adjusted without bending the injection flow path 19. Since the coolant can be accurately supplied to the cutting insert 10 with sufficient pressure, chips can be efficiently removed and the cooling performance of the cutting insert can be improved.

In the present embodiment, the coolant pool portion 16 is formed around the central axis O, and has a second wall surface region R2 whose diameter gradually decreases from the tool base end side toward the tool tip side. The inclined wall surface 16f through which the jet flow path 19 opens is located in the second wall surface region R2.
According to this configuration, the inner wall surface of the coolant reservoir 16 on the tool tip side has a substantially conical shape, and in the tool body 11 in which a plurality of insert mounting seats 12 are lined up in the circumferential direction, the above-mentioned position is close to each insert mounting seat 12. The jet flow path 19 can be formed. Since the plurality of jet flow paths 19 toward the respective insert mounting seats 12 are jet flow paths having the same jet performance as each other, the coolant can be supplied to the plurality of cutting inserts 10 with uniform pressure.

In the tool body 11 of the present embodiment, at the connection portion between the jet flow path 19 and the coolant pool portion 16, the intersection angle between the normal line of the inclined wall surface 16f and the center line of the jet flow path 19 is 45 ° or less. May be good. According to this configuration, since the jet flow path is connected from the front direction of the inclined wall surface 16f, the range in which the direction in which the jet flow path 19 extends from the coolant pool portion 16 can be adjusted becomes large. Thereby, the injection direction of the coolant can be easily adjusted without bending the injection flow path 19.

As shown in FIG. 6, nine outlet openings 19b of the jet flow path 19 are arranged in each chip pocket 14. More specifically, it has a first opening row 20A in which five outlet openings 19b are arranged in a row, and a second opening row 20B in which four outlet openings 19b are arranged in a row. In the following description, when the first opening row 20A and the second opening row 20B are not particularly distinguished, they are referred to as "opening row 20". That is, each chip pocket 14 has two rows of opening rows 20 in which the outlet openings 19b of the plurality of jet flow paths 19 are lined up in a row.

The first opening row 20A and the second opening row 20B inject coolant 25 in different directions (FIG. 9).
The first opening row 20A comprises five outlet openings 19b of the first jet flow path 19A, and injects coolant 25 toward the cutting insert 10 fixed to the insert mounting seat 12. In the present embodiment, the plurality of first jet flow paths 19A constituting the first opening row 20A are flow paths for supplying the coolant 25 toward the rake face 5a in the vicinity of the cutting edge 5 of the cutting insert 10. ..

The second opening row 20B is composed of four outlet openings 19b of the second jet flow path 19B. The second opening row 20B supplies the coolant 25 toward the front side in the tool rotation direction T with respect to the cutting insert 10 fixed to the insert mounting seat 12. In the present embodiment, the second jet flow path 19B is a flow path that supplies the coolant 25 toward the chips 30 of the work piece cut by the cutting insert 10.

As shown in FIGS. 4 and 5, each outlet opening 19b of the plurality of jet flow paths 19A and 19B constituting the opening rows 20A and 20B has a first recess 14A inclined at a predetermined angle with respect to the central axis O. The inner wall surface 14a is arranged along the inclination of the inner wall surface 14a, and is arranged in a line substantially in the axial direction of the central axis O when viewed from the radial direction of the main body 110. In the opening rows 20A and 20B, the direction in which the plurality of outlet openings 19b are lined up is substantially parallel to the extending direction of the outer peripheral blade of the cutting insert 10.

The first opening row 20A and the second opening row 20B are arranged substantially parallel to each other on the inner wall surface 14a of the first recess 14A in the chip pocket 14 at intervals in the tool rotation direction T. The first opening row 20A is formed in the vicinity of the second recess 14B to which the cutting insert 10 is attached, and the second opening row 20B is formed on the front side in the tool rotation direction T with respect to the first opening row 20A. ing.

The number of outlet openings 19b of the jet flow paths 19 constituting the opening rows 20A and 20B may be different between the first opening row 20A and the second opening row 20B. In the case of the present embodiment, the first opening row 20A that supplies the coolant 25 toward the cutting insert 10 is in the jet flow path 19 more than the second opening row 20B that supplies the coolant 25 toward the chips 30. a lot. The first opening row 20A is composed of the outlet openings 19b of the five jet channels 19A, and the second opening row 20B is composed of the outlet openings 19b of the four jet channels 19B.

The number of openings in the jet flow path 19 constituting the opening rows 20A and 20B is not limited to the number described above, and can be changed as appropriate. For example, the number of jet flow paths 19 provided in the main body 110 is increased or decreased according to the size of the cutting insert 10 and the size and amount of chips 30, and the jet flow paths 19 constituting the opening rows 20A and 20B are formed. The number of openings may be changed. The number of jet flow paths 19 in each of the opening rows 20A and 20B is at least three or more.

Further, although the main body 110 of the present embodiment has two or more opening rows 20 for each chip pocket 14, three or more rows may be formed. When three or more rows of openings 20 are arranged, the number of outlet openings 19b constituting the rows of openings 20 may be the same in a plurality of rows of openings, or may be different for each row of openings.

The flow path diameters (opening diameters of the outlet openings 19b) of the plurality of jet flow paths 19A and 19B that form the first opening row 20A and the second opening row 20B, respectively, may be different from each other. Further, even within the opening rows 20A and 20B, the flow path diameters (opening diameters of the outlet openings 19b) of the plurality of jet flow paths 19 constituting the opening rows 20A and 20B may be different.

In the present embodiment, a large coolant pool 16 is provided in the center of the main body 110, and the coolant pool 16 is directed toward each cutting insert 10 in the vicinity of the plurality of cutting inserts 10 provided on the outer periphery of the main body 110. A plurality of jet flow paths 19 are extended. Each jet flow path 19 extends linearly from the coolant pool portion 16 toward the inner wall surface 14a of the chip pocket 14 without branching in the middle. In the present embodiment, since the narrow flow path is not branched, the pressure of the coolant 25 is unlikely to drop in the injection flow path 19, and the coolant 25 is vigorously injected from the outlet opening 19b. In the present embodiment, all the jet flow paths 19 provided in the main body 110 have substantially the same shape as each other. By making the shape and length of each jet flow path 19 uniform, it is possible to suppress variations in flow path resistance for each jet flow path 19, and to make the jet pressure from each outlet opening 19b uniform.

The jet flow path 19 has a tapered shape (FIG. 7) in which the diameter is gradually reduced from the coolant pool portion 16 toward the insert mounting seat 12. The outlet opening has a reduced diameter taper shape in which the opening diameter of the outlet opening 19b on the other end side communicating with the chip pocket 14 is smaller than the opening diameter of the inlet opening 19a on one end side communicating with the coolant reservoir 16. The flow velocity of the coolant 25 ejected from the 19b side can be increased. In the present embodiment, the flow velocity of the injected coolant 25 is about 7 to 9 m / s.

As shown in FIGS. 7 and 8, a spiral groove 19d is formed on the inner inner peripheral surface of the jet flow path 19. In the present embodiment, a plurality of (4) spiral grooves 19d exist in the circumferential direction of the injection flow path 19, and each spiral groove 19d draws a spiral from the inlet opening 19a side of the injection flow path 19 to the outlet opening 19b. Is formed in.

In the present embodiment, the widths and depths of the four spiral grooves 19d are substantially the same as each other. The four spiral grooves 19d are arranged at substantially equal intervals in the circumferential direction of the inner peripheral surface of the jet flow path 19. Each spiral groove 19d is formed to have a uniform width and depth in the direction in which each spiral groove 19d extends. With these configurations, an increase in flow path resistance due to the formation of the spiral groove 19d can be suppressed. It is possible to improve the straightness of the injected coolant while suppressing the decrease in the injection pressure.

Here, the jet flow path 19 of the present embodiment is viewed from the axial direction of the central axis O shown in FIG. 4, and the extending direction of the jet flow path 19 is a direction intersecting the radial direction of the main body 110. be. In FIG. 4, the angle θ1 is the intersection of the straight line S1 extending in the radial direction of the main body 110 through the inlet opening 19a of the jet flow path 19A belonging to the first opening row 20A and the center line N1 of the jet flow path 19A. The angle. The angle θ2 is the intersection angle between the straight line S2 extending in the radial direction of the main body 110 through the inlet opening 19a of the jet flow path 19B belonging to the second opening row 20B and the center line N2 of the jet flow path 19B. In the present embodiment, the angle θ1 and the angle θ2 are different from each other, and both are 45 ° or less.

In the tool rotation direction T (counterclockwise direction in FIG. 4) of the tool body 11, the center lines N1 and N2 of the jet flow paths 19A and 19B are both behind the straight lines S1 and S2 extending in the radial direction of the main body 110. It extends toward the side. According to this configuration, the linear jet flow paths 19A and 19B can be arranged in the direction from the front side of the tool rotation direction T toward the cutting insert 10. The coolant 25 can be injected from each outlet opening 19b toward the cutting insert 10 side without forming the injection flow paths 19A and 19B in a curved shape.

In the present embodiment, the injection directions of the coolant 25 to be injected from the first opening row 20A and the second opening row 20B can be optimized by making the angle θ1 and the angle θ2 different from each other. In the case of the present embodiment, the angle θ1 is larger than the angle θ2, and the jet flow path 19A is more inclined to the rear side of the tool rotation direction T with respect to the radial direction of the main body 110 than the jet flow path 19B. ing. This makes it easier for the coolant 25 jetted from the jet flow path 19A to face the rake face 5a of the cutting insert 10.

The clamp bolt insertion hole 8 is a bolt hole into which a clamp bolt 9 for connecting the tool body 11 to the tool machine is inserted. One end side of the clamp bolt insertion hole 8 opens in the center of the bottom surface 16c of the coolant pool portion 16, and the other end side opens in the tip surface 11a. The clamp bolt insertion hole 8 is a through hole in which a first through hole 81 and a second through hole 82 having different diameters are connected in the axial direction of the central axis O. The first through hole 81 and the second through hole 82 are coaxial positions with respect to the central axis O. Both the first through hole 81 and the second through hole 82 have a diameter smaller than that of the inlet flow path 15 constituting the coolant flow path 7.

The first through hole 81 communicates with the coolant pool portion 16 and opens in the center of the bottom surface 16c thereof. The tool base end side of the second through hole 82 communicates with the first through hole 81, and the tool tip side opens in the center of the tip surface 11a. The clamp bolt 9 is inserted into the clamp bolt insertion hole 8 from the tip surface 11a side of the main body 110. The shaft portion 9b of the clamp bolt 9 is passed through the first through hole 81, and the head portion 9a of the clamp bolt 9 is inserted into the second through hole.

The clamp bolt 9 has a coolant flow path 91 formed in the center of the shaft portion 9b along the central shaft O. The coolant flow path 91 is composed of a main flow path 91a whose one end side opens to the bolt tip surface and a plurality of branch flow paths 91b communicating with the other end side of the main flow path 91a. Each branch flow path 91b opens on the outer peripheral surface of the shaft portion 9b and communicates with the coolant pool portion 16.

The cutting edge exchangeable cutting tool 100 composed of the tool body 11 and the plurality of cutting inserts 10 is attached to the spindle of the tool machine 200 via an arbor (not shown) attached to the rear end side of the tool body 11. The inlet flow path 15 of the coolant flow path 7 formed in the main body 110 is closed by an arbor. The coolant flow path of the arbor is connected to the coolant flow path 91 of the clamp bolt 9. The coolant flow path 91 of the clamp bolt 9 is connected to the coolant pool portion 16 of the main body portion 110. The coolant 25 is supplied from the coolant flow path of the arbor to the coolant pool portion 16 of the main body 110 through the coolant flow path 91 of the clamp bolt 9.

In the cutting tool 100 with a replaceable cutting edge of the present embodiment, the coolant 25 flowing into the coolant flow path 7 through the clamp bolt 9 fills the coolant accommodating space K in the coolant reservoir 16. The coolant 25 filled in the coolant accommodating space K passes through the plurality of jet passages 19A and 19B and has a diameter from the first opening row 20A and the second opening row 20B that open to the inner wall surface 14a of each chip pocket 14. It is jetted outward in the direction. As shown in FIG. 9, the injected coolant 25 is injected toward the periphery of the cutting edge 5 of the cutting insert 10. In the present embodiment, since the positions of the first opening row 20A and the second opening row 20B that open to the inner wall surface 14a of each chip pocket 14 are different from each other in the tool rotation direction T, the coolant 25 is different from each other. It is injected in two directions that are offset back and forth in the tool rotation direction.

As shown in FIG. 9, the coolant 25 is injected from the first opening row 20A toward the rake face 5a of the cutting insert 10. Further, since the outlet openings 19b of the first opening row 20A are lined up along the direction in which the cutting edge 5 extends, the coolant 25 is sprayed in a wide shape in the direction in which the cutting edge 5 extends. Since the coolant 25 can be supplied to a wide range of the rake face 5a, the cutting edge 5 that becomes hot by cutting the work piece can be quickly cooled. Further, since the coolant 25 enters between the chip 30 and the rake face 5a, the chip 30 can be easily curled into a small size. It becomes difficult for the chips 30 to enter between the object to be cut and the cutting insert 10.

Coolant 25 is injected from the second opening row 20B toward the front side in the tool rotation direction T from the cutting insert 10. As shown in FIG. 9, the chips 30 carved by the cutting edge 5 extend toward the tool base end side while being curled on the front side of the rake face 5a in the tool rotation direction T. In the present embodiment, the coolant 25 injected from the second opening row 20B aims at the chips 30 located on the front side of the rake face 5a. As a result, the generated chips 30 can be subjected to a bending force toward the outer peripheral side to break the chips 30. Therefore, the chips 30 can be quickly flicked while being divided into small pieces. It is possible to prevent the chips 30 from entering between the cutting insert 10 and the object to be cut. Since the outlet openings 19b of the second opening row 20B are also arranged along the direction in which the cutting edge 5 extends, the coolant 25 is injected in a wide shape when viewed from the axial direction of the central axis O. Therefore, almost all of the coolant 25 injected from the second opening row 20B can be applied to the chips 30. The chips 30 can be accurately blown off with a small amount of coolant 25.

In the present embodiment, the inner wall surface 14a of each chip pocket 14 is provided with two- stage opening rows 20A and 20B, and these opening positions are shifted in the tool rotation direction T. This makes it possible to simultaneously inject the coolant 25 toward both the cutting edge 5 of the cutting insert 10 and the chip 30 generated by the cutting edge 5. Therefore, the processability of the chips 30 and the cooling effect of the cutting edge 5 can be improved at the same time. Further, even when a difficult-to-cut material is machined, it is possible to prevent the sharpness of the cutting insert 10 from deteriorating, and it is expected that the tool life will be extended.

Further, since the injection flow path 19 of the present embodiment has a tapered shape in which the diameter is gradually reduced from the coolant collecting portion 16 toward the inner wall surface 14a (insert mounting seat 12) of the chip pocket 14, an orifice component is used. It is possible to increase the flow velocity of the coolant 25 to be injected without any problems, and it is possible to further improve the cooling efficiency of the cutting insert 10 and the processing efficiency of the chips 30.

Further, a spiral spiral groove 19d is formed on the inner peripheral surface of the jet flow path 19. The coolant 25 injected from the injection flow path 19 is jetted as a swirling flow by the spiral groove 19d. By providing a plurality of spiral grooves 19d in the jet flow path 19, a swirling flow can be efficiently generated. As a result, the straightness of the coolant 25 in the injection direction and the flow velocity are increased, and it becomes difficult for the coolant 25 to spread on the tip side in the injection direction. As a result, it is possible to aim at the cutting edge 5 and the chip 30 of the cutting insert 10, respectively, and it is possible to improve the efficiency of removing the chip 30 and the cooling efficiency of the cutting insert 10.

Further, in the tool body 11, the plurality of jet flow paths 19A and 19B constituting the opening rows 20A and 20B are arranged side by side in the direction along the central axis O. According to this configuration, the coolant 25 can be evenly sprayed over a wide range along the outer peripheral blade of the cutting insert 10, and the generated chips 30 can be sprayed over a wide range along the direction in which the chips 30 extend. Coolant 25 can be injected. As a result, the cooling efficiency of the cutting insert 10 and the removal efficiency of the chips 30 can be further improved.

Further, each jet flow path 19 is open to the inclined wall surface 16f near the chip pocket 14 in the coolant collecting portion 16. Since the inclined wall surface 16f is inclined along the inner wall surface 14a of the chip pocket 14, the length of the jet flow path extending from the coolant collecting portion 16 toward the insert mounting seat 12 can be shortened, and the jet flow path can be shortened. It can be jetted inside without reducing the pressure of the coolant.
Further, by providing the jet flow path 19 on the inclined wall surface 16f, the direction in which the jet flow path 19 extends can be adjusted. Therefore, the injection direction of the coolant 25 can be easily controlled, and the coolant 25 can be accurately supplied to the cutting insert 10 with sufficient pressure. Further, by making the lengths of the plurality of jet flow paths 19 uniform, the flow path resistance of each jet flow path 19 can be made uniform. As a result, the pressure of the injected coolant 25 can be made uniform, the chips 30 can be efficiently removed, and the cooling performance of the cutting insert 10 can be improved.

Further, since the tool main body 11 has a plurality of injection flow paths 19 having a small diameter extending from the coolant collecting portion 16 toward the outer peripheral surface 110a in the main body portion 110, injection molding is performed by using a 3D printer. It is possible to easily produce a complicated shape as compared with the case of producing by cutting or cutting.

Although the preferred embodiments according to the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical idea described in the claims, and of course, the technical scope of the present invention also includes them. It is understood that it belongs to.

5 ... Cutting edge 5a ... Scooping surface 7,91 ... Coolant flow path 10 ... Cutting insert 11 ... Tool body 12 ... Insert mounting seat 14 ... Tip pocket (recess)
14a ... Inner wall surface 14b ... Inner wall surface (wall surface)
15 ... Inlet flow path 16 ... Coolant pool 16f ... Inclined wall surface 19, 19A, 19B ... Injection flow path 20 ... Opening row 20A ... First opening row 20B ... Second opening row 25 ... Coolant 100 ... Cutting edge replaceable cutting Tool 110 ... Main body 110a ... Outer surface O ... Central axis R1 ... First wall surface area R2 ... Second wall surface area (wall surface area)
T ... Tool rotation direction

Claims (8)

1. A tool body used for cutting tools with interchangeable cutting edges that rotate around the axis of the central axis to cut the object to be cut.
   The main body that can rotate around the central axis,
   An insert mounting seat located on the outer peripheral portion of the main body and to which a cutting insert for cutting a work piece can be mounted.
   With
   The main body has a coolant flow path that allows coolant to flow in from the tool base end side and injects the coolant from the vicinity of the insert mounting seat.
   The coolant flow path is
   An inlet flow path located on the tool base end side of the main body and
   A coolant pool that is connected to the tool tip side of the inlet flow path and has a flow path diameter larger than that of the inlet flow path.
   A plurality of jet flow paths extending from the coolant reservoir toward the insert mounting seat,
   Have,
   The coolant pool portion has an inclined wall surface that goes inward in the radial direction toward the tool tip side, and the jet flow path is opened in the inclined wall surface.
   Tool body.
2. The coolant pool portion is formed around the central axis, and has a wall surface region whose diameter gradually decreases from the tool base end side toward the tool tip side.
   The inclined wall surface through which the jet flow path opens is located in the wall surface region.
   The tool body according to claim 1.
3. The coolant pool portion has a first wall surface area whose diameter gradually increases from the tool base end side toward the tool tip side, and a first wall surface region.
   A second wall surface region whose diameter is gradually reduced from the end of the first wall surface region on the tool tip side toward the tool tip side, and
   Have,
   The inclined wall surface through which the jet flow path opens is located in the second wall surface region.
   The tool body according to claim 1 or 2.
4. The jet flow path extends rearward in the tool rotation direction from the connection portion with the coolant pool portion.
   The tool body according to any one of claims 1 to 3.
5. The jet flow path extends linearly from the inclined wall surface toward the outer peripheral surface of the main body portion.
   The tool body according to any one of claims 1 to 4.
6. The main body has a plurality of recesses on the outer circumference on the tip side of the tool.
   The insert mounting seat is formed on a part of the inner wall surface of the recess, and the coolant flow path is opened on a wall surface of the inner wall surface other than the insert mounting seat.
   The tool body according to any one of claims 1 to 5.
7. The main body is manufactured by a 3D printer.
   The tool body according to any one of claims 1 to 6.
8. The tool body according to any one of claims 1 to 7.
   A plurality of the cutting inserts that are detachably attached to the tool body.
   Cutting tool with replaceable cutting edge.

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