JP6650133B2 - Jig, coolant supply structure and cutting tool - Google Patents

Description

  The present invention relates to a jig, a coolant supply structure, and a cutting tool.

  DESCRIPTION OF RELATED ART Conventionally, the part called a clamp piece for pressing and fixing a cutting insert from an end surface, or a presser foot is known.

  Also, a technique is known in which a coolant such as a cutting oil is discharged at the time of cutting to cool a cutting edge.

  Patent Literature 1 solves the problem that the amount of the coolant must be increased when the coolant is discharged to cool the cutting edge such that “the coolant flies in the air and hits the cutting edge” (0005). To this end, a nozzle component 4 corresponding to a presser foot for pressing the upper surface 31 of the cutting insert 3 and fixing the cutting insert 3 to the tool body 2 is provided, and a pair of discharge ports 42 formed in the nozzle component 4 is used to form A cutting tool for dispensing coolant along is disclosed.

JP 2014-231097 A

  However, in order to manufacture the cutting tool disclosed in Patent Literature 1, one end communicating with a coolant supply flow path inside the holder and a pair of openings that open to the outside are provided inside the nozzle component 4 corresponding to the presser foot. In order to connect to the other end of the device, a complicated flow path branching on the way must be formed. Such a presser foot is not only difficult to manufacture due to a complicated flow path structure, but also causes a decrease in coolant discharge pressure with an increase in flow path resistance.

  Therefore, an object of the present invention is to provide a jig, a coolant supply structure, and a cutting tool having a simple flow path structure.

  A jig provided with a presser for pressing a cutting insert according to an aspect of the present disclosure to fix the cutting insert to a holder, and a male screw part for fixing the presser to the holder. The male screw component includes a screw portion in which a male screw is formed, a head portion formed to be larger in diameter than the screw portion, and a connection portion connecting the screw portion and the head portion. A first coolant flow path is formed in the bottom surface of the screw portion to supply the coolant to the connection portion, and the first coolant flow channel is formed in the connection portion. A second coolant flow path is formed, and the presser foot has a through hole through which a male screw component penetrates, and a counterbore communicating with the through hole and the second coolant flow path and having a diameter larger than the through hole. A third coolant passage communicating with the counterbore and opening on the surface of the presser foot is formed.

  Note that the presser foot and the holder may be integrally formed.

  In addition, each flow path may be communicated with its end or a part other than the end, or the flow path resistance may be reduced by providing a plurality of ends.

  Further, when the cutting insert is fixed, it is preferable that the position where the second coolant flow path is formed in the axial direction of the external thread and the position where the counterbore are formed overlap.

  A coolant supply structure according to another aspect of the present disclosure includes a jig and a holder. The holder has a cutting insert seating surface for supporting the cutting insert, and a presser foot seating surface for supporting a presser foot that presses the end face of the cutting insert, and the holder has an opening on the presser foot seating surface. Then, a female screw for screwing with the male screw and a coolant supply passage communicating with the female screw are formed.

  A cutting tool according to still another aspect of the present disclosure includes a coolant supply structure and a cutting insert. The cutting insert has a corner cutting edge formed in an arc shape and a straight cutting edge connected to the corner cutting edge and formed in a straight line in an end view from a direction facing the end face of the cutting insert. A fourth coolant flow path communicating with the coolant supply flow path and opening to the surface of the holder is formed, and when the end face of the cutting insert is pressed by the presser and fixed to the holder, when viewed from the end face, The third coolant flow path is formed such that coolant supplied from the surface of the presser passes over the end face of the cutting insert and travels at a first acute angle toward the straight cutting edge toward the corner cutting edge. The coolant supplied from the surface of the holder passes over the end face of the cutting insert and forms a second acute angle with respect to the straight cutting edge at a second acute angle of less than half of the first acute angle. To proceed toward the, fourth coolant flow path is formed.

  Further, a jig according to still another aspect of the present disclosure, pressing a cutting insert, a presser for fixing the cutting insert to the holder, and a male screw component for fixing the presser to the holder, A jig comprising: a male screw part, a screw part in which a male screw is formed, a head formed to be larger in diameter than the screw part, and a connection part connecting the screw part and the head, The part has an opening at the bottom surface of the screw part for supplying coolant to the inside, and a first coolant flow path is formed toward the connection part. The connection part communicates with the first coolant flow path, and has one end. A second coolant flow path is formed on the side surface of the connection portion, and a third coolant flow path having one end communicating with the second coolant flow path and the other end opening on the surface of the presser foot, Is formed.

  The second coolant channel and the third coolant channel may be communicated by reducing the diameter of a part of the connection part. Further, various means such as a ring or resin can be applied to prevent leakage.

Perspective view of cutting tool 100 Enlarged view of the cutting tool 100 as viewed from the front Front view of cutting tool 100 Right side view of cutting tool 100 Enlarged view of front end of cutting tool 100 AA sectional view in FIG. Male thread part 50 Front view showing turning of work material W using cutting tool 100

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments are exemplifications for describing the present invention, and are not intended to limit the present invention to only the embodiments.

  FIG. 1 is a perspective view of a cutting tool 100 according to the present embodiment. FIG. 2 is an enlarged view of the cutting tool 100 as viewed from the front end direction. FIG. 3 is a front view of the cutting tool 100 as viewed from a direction perpendicular to the center axis AX of the holder 10, and FIG. 4 is a right side view of the cutting tool 100.

  As shown in FIG. 1, a cutting tool 100 according to the present embodiment is a turning tool for performing left-handed cutting, and includes a holder 10 for holding a cutting insert 20, a cutting insert 20, a presser foot 40, The jig 30 includes the male screw part 50. The cutting insert 20 has, for example, a corner portion forming an acute angle of 30 degrees to 40 degrees and a corner portion forming an obtuse angle of 140 degrees to 150 degrees, and an inscribed circle is formed in a rhombus shape of 8 to 15 mm. The cutting insert 20 has an end surface 24 functioning as a rake surface, a peripheral side surface 22 functioning as a flank surface, and a circle formed at a connecting portion between the end surface 24 and the peripheral side surface 22 and formed at a sharp corner of a rhombus. An arc-shaped corner cutting edge 26A and a linear straight cutting edge 26B formed on one side of the rhombus and connected to the corner cutting edge 26A are provided.

  A part of the coolant supplied toward the cutting insert 20 is supplied from the flow path formed inside the holder 10 to the first opening formed in the presser foot 40 through the flow path in the male screw part 50 of the jig 30. It is discharged from the section H1. The flow path inside the holder 10 is branched on the way, and part of the coolant is discharged from the second opening H2 formed in the holder 10. For this reason, the holder 10 and the jig 30 constitute a coolant supply structure for supplying coolant. As the coolant, a cutting fluid or other known fluid can be used.

  Similarly, as shown in FIG. 1, the holder 10 has a base portion 12 formed in a cylindrical shape or a conical shape with a small inclination around the central axis AX (FIG. 3), and is formed integrally with the base portion 12, and is formed by cutting. A holding portion for holding the insert is provided.

  As shown in FIGS. 3 and 4, on the end face of the base 12, a connection portion H <b> 3 that opens to the end face about the central axis AX is formed. The connection portion H3 is formed to engage with a pump (not shown) for supplying a coolant. Further, a cylindrical coolant flow channel CH1 formed around the central axis AX is formed so as to communicate with the connection portion H3. As shown in the figure, the coolant channel CH1 is formed from the base 12 to the holding portion 14 along the central axis AX.

  The holding portion 14 has a cylindrical holding base portion 14A1 having a diameter larger than the base portion 12 around the center axis AX, and a holder tip integrally formed with the holding base portion 14A1 at a tip end in the center axis AX direction. A portion 14A2 is provided. As shown in FIG. 3 in which the cutting tool 100 is viewed from the end surface 24 direction of the cutting insert 20, in the case of the left-hand cutting tool 100, the holder tip portion 14A2 defines the center axis AX when the cutting insert 20 is at the tip. It is formed on the left side with respect to the included center line. Further, as shown in FIG. 4 when the cutting tool 100 is viewed from the direction of the peripheral side surface 22 serving as the flank of the cutting insert 20, the holder tip portion 14A2 is formed on the lower side including the central axis AX. Therefore, the holding base portion 14A1 is formed with an inclined surface 14B1 oriented in the traveling direction of the central axis AX so as to be continuous with the holder tip portion 14A2. Then, a second opening H2 for discharging the coolant in the discharge direction AR2 is formed in the inclined surface 14B1.

  Further, a holder end surface 14B2 which is continuous with the inclined surface 14B1 and faces in the same direction as the end surface 24 of the cutting insert 20 is formed at the holder tip portion 14A2. A presser foot 40 is mounted on the holder end face 14B2. As shown in FIG. 4, the holder end surface 14B2 is not parallel to the central axis AX, but is inclined so as to approach the central axis AX toward the front end. Therefore, the end face 24 of the cutting insert 20 and the holder end face 14B2 can be visually recognized also in FIG.

  A tip seat 14C for holding the cutting insert 20 is formed at the front end of the holder tip 14A2. The tip seat 14C has a tip seat surface formed substantially parallel to the holder end surface 14B2 for supporting the bottom surface of the cutting insert 20, and a tip seat surface for supporting two peripheral side surfaces of the cutting insert 20. Vertically, it has two wall surfaces formed at the same acute angle of 30 to 40 degrees as the peripheral side surface 22 of the cutting insert 20. These two side surfaces are connected to the holder end surface 14B2 at the upper side.

  In the cutting tool 100 according to the present embodiment, the cutting insert 20 is fixed by a lever lock method. Accordingly, one end of an L-shaped lever L (FIG. 6) inserted into a hole formed inside the holder distal end portion 14A2 so as to open on the chip seat surface of the chip seat 14C is attached to the side surface of the male screw 14B3 (FIG. 3). By pressing down on the formed inclined surface or the like, the other end of the L-shaped lever L protruding from the chip seat surface and inserted into the through hole of the cutting insert 20 presses the inner wall of the through hole of the cutting insert 20, By pressing the two peripheral side surfaces of the cutting insert 20 toward the two wall surfaces of the tip seat 14C, the cutting insert 20 can be fixed to the holder 10.

  In order to press and fix a cutting insert having a through hole like the cutting insert 20 against two wall surfaces of the tip seat 14C, a female screw for screwing with a male screw 14B3 is provided inside the holder tip portion 14A2. And the female screw and the through hole of the cutting insert 20 to form a space for accommodating the L-shaped lever L. However, the present invention is not limited to the case where the cutting insert is fixed by a lever lock method, but includes a method of fixing a cutting insert having no through hole using a presser such as a clamp piece. The present invention can be widely applied to a case where a cutting insert is fixed by using a clamp mechanism specified in the above.

  The shim 16 is inserted between the cutting insert 20 and the chip seating surface. As a result, the end face 24 of the cutting insert 20 and the holder end face 14B2 of the holder tip 14A2 are adjusted to be substantially flush. ing.

  As shown in FIGS. 3 and 4, the coolant flow channel CH1 formed along the central axis AX is formed from the base 12 to the holding portion 14, and the center thereof is smaller in diameter than the coolant flow channel CH1 at the end. It communicates with a coolant channel CH2 formed in a cylindrical shape along the axis AX. The coolant channel CH2 communicates with a coolant channel CH3 having a smaller diameter than the coolant channel CH2 at the tip. Further, on the side surface forming the cylinder of the coolant channel CH2, the coolant channel CH4 communicates with the coolant channel CH4 having a smaller diameter than the coolant channel CH2.

  As shown in FIGS. 3 and 4, the coolant channel CH3 is formed in a cylindrical shape from the holding base portion 14A1 to the holder tip portion 14A2, and a female screw that is screwed into the screw portion 50B of the male screw component 50 (FIG. 4). It communicates with the formed coolant channel CH5. Specifically, as shown in FIG. 3, the coolant passage CH <b> 3 is inclined away from the central axis AX as it progresses toward the male screw component 50, and the cutting insert 20 is viewed from the circumferential side surface 22 direction. In No. 4, it is formed so as to be inclined away from the holder end face 14B2 as it advances in the direction of movement of the central axis AX.

  The coolant channel CH4 is formed from the side surface of the coolant channel CH2 toward the radial outside of the central axis AX. The coolant channel CH4 communicates with a coolant channel CH6 that defines the discharge direction AR2 of the coolant discharged from the second opening H2 on the cylindrical side surface.

  The coolant channel CH5 extends substantially perpendicular to the holder end face 14B2 and communicates with the end of the cylindrical side surface of the coolant channel CH3. On the inner wall of the coolant channel CH5, a female screw for screwing with a male screw formed on the screw portion 50B of the male screw component 50 is formed.

  The coolant channel CH6 is formed such that one end communicates with the side surface of the coolant channel CH4 and the other end communicates with the inclined surface 14B1. As will be described in detail later, the coolant flow channel CH6 is configured such that the extension of the central axis thereof is directed to the corner cutting edge 26A of the cutting insert 20, and the end face 24 of the cutting insert 20 and the end face 24 thereof in a side view shown in FIG. It has an elevation angle of about 10 to 15 degrees with respect to the flat end face 14B2 of the holder, and is located on the end face 24 when viewed from a direction facing the end face 24 of the cutting insert 20 and has a corner cutting edge 26A. It is formed so as to make a slight acute angle (greater than 0 degree and less than 10 degrees) with the straight line formed by the straight cutting edge 26B so that it approaches the straight cutting edge 26B as it approaches.

  Next, a flow path from the coolant flow path CH5 to the first opening H1 will be described with reference to the drawings. FIG. 5 is an enlarged view in which a front end portion of the cutting tool 100 in FIG. 3 is enlarged. FIG. 6 is a cross-sectional view passing through the center of the first opening H1 and the axis of the externally threaded component 50 in FIG. FIG. 7 shows the male screw part 50.

  As shown in FIG. 7, for example, the male screw part 50 includes a cylindrical screw part 50B in which an M6 male screw is formed, a screw head 50A formed larger in diameter than the screw part 50B, and a screw part 50B. A connection portion 50C (or a tightening screw portion 50C) for connecting to the screw head 50A is provided. In the screw portion 50B, a cylindrical coolant channel CH7 having a diameter of, for example, 1 to 3 mm is formed along the axis of the male screw, and opens in the bottom surface and extends in the direction of the connection portion 50C. The connecting portion 50C is sandwiched between two small-diameter portions 50C1 and 50C2 formed to have a small diameter for fitting the O-ring, and is larger than the small-diameter portions 50C1 and 50C2. Is provided with a cylindrical portion 50C3 formed at the bottom. Inside the cylindrical portion 50C3, there is formed a coolant flow channel CH8 that penetrates perpendicularly to the axis of the male screw and has both ends opened on the side surfaces of the cylindrical portion 50C3. The coolant channel CH7 is formed up to the inside of the cylindrical portion 50C3 of the connecting portion 50C so as to communicate with the coolant channel CH8. Note that a hexagonal hole (FIG. 5) for engaging a hexagonal wrench used for tightening is formed in the screw head 50A.

  As shown in FIG. 6, the presser foot 40 includes an upper surface 40B for abutting on the screw head 50A, a leg 40C formed on the bottom surface side and supported by a recess formed on the holder end surface 14B2, It has a pressing portion 40D for pressing the end surface 24 of the insert 20 to fix it to the holder 10, and an inclined surface 40A facing the end surface 24 of the cutting insert 20. Further, the presser foot 40 is formed with a cylindrical through-hole penetrating the upper surface 40B and the bottom surface, and further communicates with the through-hole at a central portion in the axial direction of the through-hole, and is formed larger in diameter than the through-hole. A counterbore 40E is formed. The counterbore 40E is formed at a position that communicates with the opening of the coolant channel CH8 formed on the side surface of the cylindrical portion 50C3 when the screw head 50A contacts the upper surface 40B. Since the counterbore 40E is formed in a cylindrical shape having a predetermined radius around the center axis of the through hole formed in the presser foot 40, the counterbore 40E and the coolant channel CH8 are formed regardless of the direction of the coolant channel CH8. Are configured to communicate. Further, a coolant flow channel CH9 having one end communicating with the counterbore 40E and the other end communicating with the inclined surface 40A is formed inside the presser foot 40. As shown in the figure, the coolant channel CH9 is inclined so as to advance toward the corner cutting edge 26A of the cutting insert 20, and the coolant channel CH9 is inclined with respect to a plane perpendicular to the center axis of the through hole of the presser foot 40. The elevation angle is formed to be 10 degrees to 15 degrees.

  As shown in FIG. 6, such a presser foot 40 is attached to a small diameter portion 50C1 and 50C2 of the male screw part 50 with the O-rings R1 and R2 attached thereto, respectively, through a through hole of the presser foot 40. The upper surface 40B of the presser foot 40 is fixed to the holder 10 by screwing with a female screw formed at the distal end portion 14A2 and pressing the upper surface 40B of the presser foot 40 with the screw head 50A. At this time, the pressing portion 40D presses the end surface 24 of the cutting insert 20 in the chip seat surface direction of the chip seat 14C. The lever lock type has the advantage that the cutting insert can be replaced in a short time compared to the method of fixing the cutting insert to the holder with a male screw penetrating it, but it is difficult to fix it stably in the direction perpendicular to the end face It is. However, by pressing the end face 24 of the cutting insert 20 toward the holder 10 using the presser foot 40, the cutting insert 20 can be more stably fixed to the holder 10.

  FIG. 5 is a view of the state in which the presser foot 40 is fixed to the holder 10 as described above, as viewed from the axial direction of the externally threaded component 50. As described above, a hexagonal hole is formed in the screw head 50A as shown by a solid line in the drawing. A small circle indicated by a broken line inside the hexagonal hole indicates the inner wall of the coolant channel CH7 formed at the center of the shaft. A rectangular broken line that intersects both ends of the small circle indicates the coolant channel CH8. Three circles D1, D2, and D3 having different diameters are shown by broken lines so as to surround the hexagonal hole shown by the solid line. Of the three circles, the circle D3 having the smallest diameter indicates the inner wall of the coolant channel CH5. The circle D2 indicates the wall surface of the cylindrical portion 50C3, and the coolant channel CH8 is formed up to the circle D2. The circle D1 indicates the inner wall of the counterbore 40E formed of a cylindrical surface. Therefore, the coolant that has flowed into the counterbore 40E from the coolant channel CH8 flows into the coolant channel CH9 through the gap between the counterbore 40E (circle D1) and the cylindrical portion 50C3 (circle D2) as indicated by the arrow. It is.

  The coolant channels CH1 to CH9 can be formed by piercing using a drill or the like. For example, after forming a cylindrical hole in the coolant flow channel CH3 so as to communicate with the coolant flow channel CH2 from the side facing outward of the holder distal end portion 14A2, the opening is leaked using a plug or the like. It can be formed by closing so that it does not. Therefore, each coolant flow path is formed in a columnar shape having a predetermined inner diameter, and in order to prevent mixing of air bubbles and the like, and to reduce pressure loss, as a general rule, the diameter of the coolant flow path becomes smaller as progressing. Is formed.

  Hereinafter, an operation of turning a work material using the cutting tool 100 according to the present embodiment will be described. FIG. 8 shows a state in which the workpiece W having the upright wall W1 is turned using the cutting tool 100. More specifically, while rotating the work material W from the front side to the back side of the paper, the corner cutting edge 26A formed at the tip of the cutting insert 20 is pressed against the inner wall surface of the ring-shaped upright wall W1 to thereby raise the upright wall W1. Turning the inner wall of At this time, since the inner wall surface of the upright wall W1 is in close proximity to the straight cutting edge 26B and the peripheral side surface 22 connected thereto, the cutting insert 20 is formed in a diamond shape having a small acute angle so as not to interfere with the upright wall W1. Is preferred. In addition, cutting and discharging of chips, which are not easy because the inner wall surfaces of the standing wall W1 are close to and opposed to each other, are promoted by using coolant discharged from two directions.

  First, for example, turning is performed while a coolant (not shown) is connected to a pump (not shown) connected to the connection portion H3 to be tightened in FIG. The coolant is supplied from the pump at, for example, 5 MPa to 10 MPa. The coolant supplied from the pump is discharged from the coolant channel CH1 through the coolant channel CH2, and part of the coolant is discharged from the coolant channel CH4 through the coolant channel CH6 in the discharge direction AR2 from the second opening H2. Another part flows from the coolant flow channel CH3 into the coolant flow channel CH5, proceeds from the coolant flow channel CH7 formed inside the screw portion 50B toward the screw head 50A, and from the coolant flow channel CH8 to the counterbore 40E. Is discharged from the first opening H1 through the coolant channel CH9 in the discharge direction AR1.

  The distance between the first opening H1 and the corner cutting edge 26A is shorter than the distance between the second opening H2 and the corner cutting edge 26A. The flow path system of the coolant flow path CH6 is formed to be larger than the coolant flow path CH9. Therefore, the pressure of the coolant discharged from the first opening H1 and traveling on the end face 24 decreases relatively little. Therefore, it is possible to cause the coolant to collide with the chips at a pressure sufficient to divide the chips. When the inventors of the present application performed experiments under various conditions, the elevation angle of 10 to 15 degrees with respect to the end face 24 so as to pass through the center of the end face 24 (that is, when the cutting insert was attached). The coolant is discharged toward the corner cutting edge 26 </ b> A so as to form an angle between the position where the corner cutting edge is expected to exist, the line connecting the first opening H <b> 1 and the end face of the cutting insert). As a result, it was found that the chip breaking effect was more suitably exhibited. In order to have a large elevation angle, the height of the presser foot 40 must be increased. However, if the height of the presser foot 40 is increased, chips may come into contact. For this reason, it is conceivable to reduce the height of the presser foot and supply the coolant so as to have an elevation angle of less than 5 to 10 degrees. However, it is conceivable that the presser foot 40 is about 10 mm so as to have an elevation angle of 10 degrees or more. It has been found that by setting the coolant channel CH9 communicating with the first opening H1, the chip breaking effect is enhanced. Furthermore, the effect of cooling the cutting insert 20 is also exhibited by discharging the coolant.

  On the other hand, the pressure of the coolant discharged from the second opening H2 is lower than the pressure of the coolant discharged from the first opening H1. The coolant discharged from the second opening H2 advances toward the corner cutting edge 26A along the straight cutting edge 26B or almost parallel to the wall surface of the upright wall W1. Therefore, when viewed from the direction facing the end face 24, the angle of the two coolants is approximately half the angle between the two sides connected to the corner cutting edge 26A of the cutting insert 20. Thus, it has been found that there is an effect of discharging the chips by supplying the coolant toward the corner cutting edge 26A along the straight cutting edge 26B or substantially parallel to the wall surface of the standing wall W1.

  When the inventors of the present application performed experiments under various conditions, it was found that a straight line L1 (FIG. 8) formed by a straight cutting edge 26B greatly involved in cutting near a connecting portion with the corner cutting edge 26A faces the end face 24. When viewed from the direction in which the coolant flows, the coolant discharged from the second opening H2 travels on the end face 24, and approaches the straight line L1 as the travel proceeds. It has been found that when the coolant is discharged toward the corner cutting edge 26A so as to form an angle (less than half the angle formed by the coolant discharged from the opening H2 and the straight line L1), the chip discharging performance is further improved.

  In order to realize such an operation, as shown in FIG. 8, when the cutting insert 20 is arranged on the tip seat 14C, a straight line L1 is formed based on a position where the straight cutting edge 26B is assumed to be present. In this case, the second opening H2 is provided on the cutting insert 20 side (left side of the straight line L1 in FIG. 8) of the straight line L1.

  As described above, the chips are discharged by discharging the coolant from the first opening H1 having a small distance to the corner cutting edge 26A, passing over the central portion of the end face 24 of the cutting insert 20 toward the corner cutting edge 26A. The coolant is discharged from the first opening H1 having a large distance from the corner cutting edge 26A to the cutting edge 20 so as to pass through the end of the end face 24 of the cutting insert 20 and travel toward the corner cutting edge 26A. It was found that emission could be promoted. However, it is not always necessary to configure so that the coolant is discharged from the second opening H2. Conversely, an opening may be further provided to supply the coolant from different directions.

  Further, the coolant could be supplied through the flow path having a small pressure loss without forming a complicated flow path inside the presser foot 40.

  As described above, in the present embodiment, the elevation angle of the coolant is preferably 10 to 15 degrees, but is not limited thereto.

  Further, the presser foot 40 may be provided integrally with the holder 10. For example, a part corresponding to a presser foot for pressing the end face of the cutting insert, and a part corresponding to a tip seat for pressing the bottom surface of the cutting insert and the like are integrally provided, and the cutting insert is vertically arranged like a beak. Is known. In such an embodiment, when the cutting insert is fixed to the holder by adjusting the interval between the portion corresponding to the presser foot and the portion corresponding to the tip seat with a male screw, the present embodiment is installed inside such a male screw. The present invention may be applied by forming a coolant channel as shown in the form.

  In addition, a plurality of flow paths can be provided. For example, one or more flow paths may be connected to the coolant flow path CH8.

  Various means can be used for communicating the coolant flow channel CH9 and the coolant flow channel CH8. For example, the cylindrical portion 50C3 may be formed to have a small diameter.

  In addition, various known techniques can be applied to the configuration for suppressing the liquid leakage, in addition to the ring.

  In addition, the present invention can be variously modified without departing from the gist thereof. For example, some components of one embodiment may be combined with another embodiment within the ordinary creative ability of those skilled in the art.

DESCRIPTION OF SYMBOLS 10 ... Holder, 12 ... Base, 14 ... Holder, 14A1 ... Holder base, 14A2 ... Holder tip, 14B1 ... Inclined surface, 14B2 ... Holder end face, 14C ... Tip seat, 16 ... Shim, 20 ... Cutting insert, 22 ... peripheral side surface, 24 ... end surface, 30 ... jig, 40A ... inclined surface, 40B ... upper surface, 40C ... leg, 40D ... pressing part, 40E ... counterbore, 42 ... discharge port, 50 ... parts, 50A ... head, 50C ... Connecting part, 50C1 ... Small diameter part, 50C3 ... Cylindrical part, 100 ... Cutting tool, AX ... Central axis, CH1-CH9 ... Coolant flow path, W ... Work material

Claims (2)

A holder,
A coolant supply structure comprising: a presser for pressing the cutting insert; and a jig including a presser for fixing the cutting insert to the holder and an external thread part for fixing the presser to the holder. ,
The male screw part,
A thread portion where an external thread is formed;
A head formed to be larger in diameter than the screw portion;
A connection portion that connects the screw portion and the head,
In the screw portion, a first coolant channel that opens to the bottom surface of the screw portion to supply coolant to the inside and is directed toward the connection portion is formed,
A second coolant flow passage communicating with the first coolant flow passage and opening to a side surface of the connection portion is formed in the connection portion;
The presser foot has a through hole through which the male screw component passes, a counterbore communicating with the through hole and the second coolant channel, and a counterbore formed larger in diameter than the through hole, and a communication with the counterbore. A third coolant flow path which is open on the surface of the presser foot.
The holder is
With a cutting insert seating surface for supporting the cutting insert,
In the holder,
A female screw for screwing with the male screw,
A coolant supply passage communicating with the female screw;
Communicating with the coolant supply channel, opening to the surface of the holder for discharging the coolant, and a cylindrical fourth coolant channel having a diameter larger than the third coolant channel ; and
In the holder, a hole portion is formed to open a part of the cutting insert seating surface and to house a part of a lever inserted into an insert through hole penetrating the cutting insert,
The holder further comprises:
A lever partly housed in the hole, and another part protruding from the hole,
A second screw portion for moving the lever in a side direction of the insert through-hole,
A coolant supply structure further comprising: A coolant supply structure according to claim 1 , comprising the cutting insert,
The cutting insert has a corner cutting edge formed in an arc shape, and a straight cutting edge connected to the corner cutting edge and formed in a straight line, when viewed from an end face viewed from a direction facing an end surface of the cutting insert. With
When the end face of the cutting insert is pressed by the presser foot and fixed to the holder,
In the end face view, the coolant supplied from the surface of the presser foot passes over the end face of the cutting insert, and advances toward the corner cutting edge at a first acute angle with respect to the straight cutting edge. The third coolant flow path is formed, and the coolant supplied from the surface of the holder passes over the end face of the cutting insert, and the second coolant flow path is less than half of the first acute angle with respect to the straight cutting edge. The fourth coolant flow path is formed so as to advance toward the corner cutting edge at an acute angle.
Cutting tools.