JP2021094679A - Slotting cutter with coolant hole, and fitting member for slotting cutter with coolant hole - Google Patents

Abstract

To prevent a coolant being jetted from a coolant hole from being uneven in pressure while securing an amount of supply of the coolant and a cutting-in depth.SOLUTION: A cutting edge 3a is provided at an outer peripheral portion of a disk-like cutter body 1 rotated around an axis O and centered on the axis O, and the cutter body 1 has a coolant hole 5 formed extending from an inner peripheral part to an outer peripheral side to be open, and a coolant groove 6 formed in one side face 1A of the cutter body 1 and in communicate with the coolant hole 5. The coolant groove 6 comprises a first coolant groove part 6A having opposite ends thereof extending in a circumferential direction at intervals with the fitting hole 1a and communicating with the coolant hole 5, and a second coolant groove part 6B which is formed such that a circumference of the fitting hole 1a is recessed to an inner peripheral side of the cutter body 1 and which is spaced from the fitting hole 1a connecting the opposite ends of the first coolant groove part 6A. The coolant groove 6 is formed so as to be continuous over the entire inner periphery of the cutter body 1 around the axis O.SELECTED DRAWING: Figure 3

Description

In the present invention, a cutting edge having a cutting edge length in the axial direction larger than the thickness of the outer peripheral portion of the cutter body is formed on the outer peripheral portion of a disk-shaped cutter main body centered on an axis that is rotated in the cutter rotation direction around the axis. Is provided, and a slotting cutter with a coolant hole having a coolant hole extending from the inner peripheral portion to the outer peripheral side is formed in the cutter body, and a slotting cutter with such a coolant hole for attaching to an arbor or the like. It relates to a mounting member of a slotting cutter with a coolant hole.

In this way, a slotting cutter provided with a cutting edge having a cutting edge length larger in the axial direction than the thickness of the outer peripheral portion of the cutter body on the outer peripheral portion cuts the outer peripheral portion of the cutter body provided with the cutting edge. It is used to perform narrow grooving on the work material by cutting into the material, or it is used for parting and cutting of the work material. Since the cutting edge length in the axial direction of the cutting edge is larger than the thickness of the outer peripheral portion of the cutter body, the outer peripheral portion of the cutter body does not interfere with the groove formed by the cutting edge.

As such a slotting cutter, for example, Patent Document 1 describes a slot milling disk having a central axis, which has an outer peripheral surface having a large number of cutting edges and a first side surface having a support surface around the central axis. And, the slot milling disk is mounted on the mounting shaft in a non-rotatable manner by interacting with the second side surface opposite to the first side surface and the mating mounting means of the rotatable mounting shaft. Also described are those that include mounting means adapted so that the support surface can be pressed against the mounting surface at the end face of the mounting shaft.

The slotting cutter described in Patent Document 1 has a closed cross section, and has at least one outlet opening in the outer peripheral surface of the slot milling disk from the inlet opening in the support surface of the slot milling disk. It has at least one injection supply fluid passage (coolant hole) extending to, and the support surface is a plane on the first side surface of the slot milling disk, extending orthogonally to the central axis. The inlet opening is accompanied by the injection supply fluid passage that forms a blind hole in the flat support surface and extends in the direction toward the outer peripheral surface of the slot milling disc.

Further, in Patent Document 1, the machine tool is described as a mounting shaft (mounting member for a slotting cutter with a coolant hole) for mounting such a slotting cutter with a coolant hole on an arbor or the like mounted on a spindle of a machine tool. On the other hand, a rotatable mounting shaft for mounting in a rotatable form, wherein the rotatable mounting shaft is rotatable about a central axis is described.

Then, in the mounting member described in Patent Document 1, the support surface on the first side surface of the slot milling disc interacts with the mating mounting means of the slot milling disc to form the end face of the rotatable mounting shaft. A mounting means adapted to press against a mounting surface orthogonal to the central axis, and a fluid-communication state with the fluid passage inside the rotatable mounting shaft, and from the fluid passage to the slot milling disc. Includes a supply opening in the mounting surface that is shaped and positioned to allow the supply of jet supply fluid to the inlet opening.

On the other hand, also in Patent Document 2, as a slotting cutter with a coolant hole, it is possible to prevent rotation of a grooved milling disc on an outer peripheral surface provided with some cutting edges and a rotatable mounting shaft. From an inlet opening that has a limited cross-section, is located in the center of the disc, and is configured to be connected to a flushing fluid source, to the outer peripheral surface of the disc. A grooved milling disc is described that includes at least one flushing fluid channel (coolant hole) extending within the milling disc up to at least one outlet opening.

Then, in the slotting cutter with a coolant hole described in Patent Document 2, at least one flushing fluid channel extends from the inlet opening toward the outer peripheral surface and terminates before reaching the inlet opening. At least extending from the internal channel portion and extending to at least one outlet opening while reorienting the flushing fluid channel in a manner tilted towards the cutting edge with the internal channel portion Includes one external channel portion.

Further, also in Patent Document 2, as a mounting member for a slotting cutter with a coolant hole, a rotatable mounting shaft is mounted on an upper grooved hole milling disk to prevent rotation, and this shaft is inside the shaft. Within the end face of the shaft, which communicates with the fluid channel and is shaped and placed to allow the flushing fluid to be delivered from the fluid channel to the inlet opening of the grooved milling disc. Those that include a supply opening are described.

Japanese Patent No. 6526987 Special Table 2018-534158 Gazette

By the way, in the slotting cutters with coolant holes described in Patent Documents 1 and 2, as shown in FIGS. 3 to 6 and 8 of Patent Document 1 and FIGS. 3 to 5 of Patent Document 2, the cutter main body is used. The radius from the axis of the above to the entrance opening is within the radius of the circle inscribed in the screw hole for attaching the cutter body to the mounting member and the circle circumscribed around the axis of the cutter body, thereby opening the entrance. The part is divided into multiple parts.

Further, in the case where the inlet opening is formed in a groove shape, the number of coolant holes branching from these divided inlet openings is also different. For this reason, in the slotting cutters with coolant holes described in Patent Documents 1 and 2, the pressure of the coolant ejected from each coolant hole is biased, so that reliable removal of chips and cooling of the cutting edge can be performed. Lubrication may be difficult.

Here, in order to prevent such a bias in the coolant pressure, the radius from the axis of the cutter body to the inlet opening should be made smaller than the radius of the circle inscribed in the screw hole centering on the axis of the cutter body. Alternatively, it is conceivable to make the radius of the circle circumscribing the screw hole larger than the radius of the circle, and to form the groove-shaped inlet opening in an annular shape that orbits around the axis so as to avoid the screw hole.

However, when the radius from the axis to the inlet opening is smaller than the radius of the circle inscribed in the screw hole, the opening area of the annularly formed inlet opening becomes smaller, and a sufficient amount of coolant is supplied. It becomes difficult to supply and eject. In addition, when the radius from the axis to the entrance opening is made larger than the radius of the circle circumscribing the screw hole, the outer diameter of the tip of the mounting member to which the cutter body is attached must also be made larger. The depth at which the cutting edge from the cutting edge to the outer periphery of the tip of the mounting member can be cut becomes small, and deep groove grooving cannot be performed.

On the other hand, in the mounting members described in Patent Documents 1 and 2, the flow paths (coolant supply holes) for supplying coolant to the plurality of inlet openings of the cutter body are also branched into a plurality of flow paths. High machining accuracy and connection accuracy are required to supply coolant by accurately matching the inlet opening with the inlet opening in the circumferential direction. Moreover, these flow paths are inclined with respect to the axis toward the outer peripheral side toward the tip side, and a lot of time, labor, and cost are required to form such an inclined flow path. It becomes.

The present invention has been made under such a background, and while ensuring the amount of coolant supplied and the depth at which the cutting edge can be cut, it is possible to prevent the pressure of the coolant ejected from the coolant hole from being biased. The primary purpose is to provide a slotting cutter with a coolant hole that can reliably remove chips, cool the cutting edge, and lubricate the cutting edge. A second object of the present invention is to provide a mounting member for a slotting cutter with a coolant hole, which allows the coolant supply hole to communicate with the coolant hole of the cutter body at no cost.

In order to solve the above-mentioned problems and achieve the above-mentioned first object, the slotting cutter with a coolant hole of the present invention has a disk shape centered on the above-mentioned axis, which is rotated in the direction of rotation of the cutter around the axis. A chip pocket is formed on the outer peripheral portion of the cutter body, and the cutting edge length in the axial direction is greater than the thickness of the outer peripheral portion of the cutter body in the axial direction at the outer peripheral edge of the wall surface of the chip pocket facing the cutter rotation direction. The cutter body is a slotting cutter with a coolant hole, which is provided with a large cutting edge and has a coolant hole extending from the inner peripheral portion of the cutter body to the outer peripheral side. A mounting hole that penetrates the cutter body in the axial direction is formed on the inner peripheral portion away from the axis on the outer peripheral side, and one side surface of the two side surfaces of the cutter body communicates with the coolant hole. The coolant groove is formed, and the coolant groove extends in the circumferential direction of the cutter body so that both ends are spaced from the mounting hole and communicates with the coolant hole, and the axial direction. The mounting hole is formed so as to be recessed toward the inner peripheral side of the cutter body when viewed from the direction facing one side surface, and connects both ends of the first coolant groove portion. A second coolant groove portion is provided, and the inner peripheral portion of the cutter body is formed so as to be continuous over the entire circumference around the axis.

In the slotting cutter with a coolant hole configured in this way, the coolant grooves formed in the cutter body extend in the circumferential direction of the cutter body so that both ends are spaced from the mounting holes and communicate with the coolant holes. It also includes a first coolant groove and a second coolant groove that connects both ends of the first coolant groove and is also spaced apart from the mounting holes.

Therefore, even if the first coolant groove itself is divided in the circumferential direction of the cutter body by the mounting holes, the coolant groove is formed by the second coolant groove portion connecting both ends of the first coolant groove portion as described above. The inner peripheral portion of the cutter body can be formed so as to be continuous over the entire circumference around the axis. Therefore, the amount of coolant supplied to the coolant groove can be secured, and the pressure of the coolant supplied from the coolant groove to the coolant hole can be prevented from being biased, so that chips can be reliably removed and the cutting edge can be cut. It is possible to cool and lubricate the blade.

The second coolant groove is formed so that the circumference of the mounting hole is recessed toward the inner peripheral side of the cutter body when viewed from the direction facing the one side surface in the axial direction. Therefore, the coolant groove is formed in the cutter body. It is possible to avoid protruding to the outer peripheral side of the circle circumscribing the mounting hole centered on the axis of. Therefore, it is possible to prevent the outer diameter of the tip of the mounting member to which the cutter body is attached from becoming large, and it is possible to secure a sufficient cutting depth for the cutting edge provided at the outer peripheral end of the cutter body. ..

Further, the second coolant groove portion is provided with an arc-shaped portion formed in an arc shape centered on the center line of the mounting hole when viewed from the direction facing the one side surface in the axial direction. Since the distance from the mounting hole can be kept constant in this arcuate portion, the strength of the cutter body can be maintained. In particular, by making the entire second coolant groove portion an arc-shaped portion as a whole, the distance between the second coolant hole and the mounting hole can be made constant.

Further, the first coolant groove portion is formed in an arc shape centered on the axis line, and the radius from the axis line to the wall surface of the first coolant groove portion facing the inner peripheral side of the cutter body is defined as the axis line. By setting the center to be equal to or less than the radius of the circle circumscribing the mounting hole, the length of the first coolant groove in the circumferential direction can be secured larger as long as the cutting depth of the cutting edge is not impaired. ..

In particular, when the entire second coolant groove portion is formed as the arc-shaped portion as described above, the radius from the axis line to the wall surface of the first coolant groove portion facing the inner peripheral side of the cutter body is set. By setting the radius from the axis to the center line of the mounting hole or less, the length of the first coolant groove in the circumferential direction is secured, and at the connecting portion of the first and second coolant grooves, these first , The second coolant groove does not intersect at an acute angle. Therefore, it is possible to prevent the coolant pressure from being biased at such an acute-angled connection portion.

On the other hand, in order to achieve the second object, the mounting member of the slotting cutter with a coolant hole of the present invention has a through hole formed on the inner peripheral side of the coolant groove of the cutter body as described above. The slotting cutter with a coolant hole is a mounting member for a slotting cutter with a coolant hole to which one side surface thereof is directed toward the tip side, and is formed in a cylindrical shape centered on the axis, and the axis is coaxial. In this state, a coolant supply hole that communicates with the through hole is formed in the inner peripheral portion, and a mounting screw hole that communicates with the mounting hole is formed on the tip surface, and the axis is the center. A mounting screw insertion hole is formed which is formed in a disk shape and communicates with the mounting hole in a state where the axis is coaxial, and the mounting screw inserted from the mounting screw insertion hole through the mounting hole is the mounting screw hole. The cutter body is provided with a flange member that is screwed into the cutter body so as to be sandwiched between the cutter body and the tip surface of the mounting member body, and the rear end surface of the flange member facing the mounting member body side has an inner circumference. The outer peripheral portion is formed so that a recessed portion from the rear end surface that communicates with the coolant groove is formed so as to avoid the mounting screw insertion hole.

In the mounting member of the slotting cutter with a coolant hole configured in this way, the coolant supplied to the coolant supply hole in the inner peripheral portion of the mounting member body once passes through the through hole of the cutter body and is once on the mounting member side of the flange member. It flows into the recess formed on the rear end face facing. Then, the coolant that has flowed into the recess flows into the coolant groove of the cutter body from the outer peripheral portion of the recess, is supplied to the coolant hole of the cutter body that communicates with the coolant groove, and is ejected to the outer peripheral portion of the cutter body. Removes chips, cools and lubricates the cutting edge.

Therefore, in the mounting member of the slotting cutter with a coolant hole having the above configuration, if any part of the recess of the flange member is open to the continuous coolant groove over the entire circumference of the inner peripheral portion of the cutter body, Since the coolant can be supplied from the coolant groove of the cutter body to the coolant hole, high processing accuracy and connection accuracy are not required for alignment in the circumferential direction.

Further, since the mounting member main body may be cylindrical, it is not necessary to incline the coolant supply hole, and it does not require much time, labor, or cost to form such a coolant supply hole. .. Moreover, once the coolant is held in the recess of the flange member, the pressure of the coolant ejected from the coolant hole through the coolant groove of the cutter body can be further made uniform. The mounting member of the slotting cutter with a coolant hole of the present invention is a shell-type mounting member in which the mounting member body is mounted on the spindle of the machine tool via an arbor, or the mounting member body is directly mounted on the spindle of the machine tool. It can be applied to shank type mounting members.

Here, when the wall surface of the recess facing the inner peripheral side of the flange member when viewed from the direction facing the rear end surface in the axial direction is viewed from the direction facing the one side surface in the axial direction. The wall surface of the coolant groove facing the inner peripheral side of the cutter body when viewed from the direction facing the inner peripheral side of the cutter body, or when viewed from the direction facing the one side surface in the axial direction. By making the shape larger than that, it is possible to efficiently supply the coolant to the coolant groove and the coolant hole.

Further, the cutter body is formed by forming an annular wall portion on the tip surface of the mounting member body, which protrudes from the tip surface and is fitted into the through hole of the cutter body, on the outer periphery of the opening of the coolant supply hole. It can be reliably positioned in the radial direction with respect to the axis line, and high-precision grooving can be performed.

Further, when the annular wall portion is formed on the tip surface of the mounting member body in this way, the annular groove portion recessed from the tip surface is also adjacent to the outer peripheral side of the annular wall portion on the tip surface of the mounting member body. The corner portion where the tip surface of the mounting member body and the outer peripheral surface of the annular wall portion intersect with each other interferes with the other side surface of the cutter body that comes into contact with the tip surface. Since it can be avoided, the cutter body can be stably attached to the attachment member body.

As described above, according to the slotting cutter with a coolant hole of the present invention, the amount of coolant supplied and the depth at which the cutting edge can be cut can be secured, and the pressure of the coolant ejected from the coolant hole can be adjusted. By preventing bias, it is possible to reliably remove chips, cool the cutting edge, and lubricate the cutting edge.

Further, according to the mounting member of the slotting cutter with a coolant hole of the present invention, high processing accuracy and connection accuracy with the slotting cutter with a coolant hole are not required, and the time, labor and cost required for manufacturing are reduced. By reducing the amount, it becomes possible to reliably communicate the coolant supply hole with the coolant hole of the cutter body to supply the coolant.

It is a perspective view which saw from one side surface side of the cutter body which shows one Embodiment of the slotting cutter with a coolant hole of this invention. It is a perspective view seen from the other side surface side of the cutter body in the embodiment shown in FIG. FIG. 5 is a side view of the embodiment shown in FIG. 1 as viewed from a direction facing one side surface of the cutter body in the axial direction. FIG. 5 is a side view of the embodiment shown in FIG. 1 as viewed from a direction facing the other side surface of the cutter body in the axial direction. It is a perspective view which shows the mounting member main body in one Embodiment of the mounting member of the slotting cutter with a coolant hole of this invention. It is a side view of the mounting member main body shown in FIG. It is a bottom view which looked at the mounting member main body shown in FIG. 6 from the tip side in the axial direction. FIG. 6 is a plan view of the mounting member main body shown in FIG. 6 as viewed from the rear end side in the axial direction. It is a perspective view which shows the flange member in one Embodiment of the mounting member of the slotting cutter with a coolant hole of this invention. It is a side view of the flange member shown in FIG. It is a bottom view which looked at the flange member shown in FIG. 9 from the tip side in the axial direction. 6 is a plan view of the flange member shown in FIG. 6 as viewed from the rear end side in the axial direction. It is a perspective view which showed the state which the slotting cutter with a coolant hole of an embodiment shown in FIGS. 1 to 4 was attached to the attachment member shown in FIGS. 5 to 13 seen from one side surface side of the cutter main body. It is another perspective view which looked at the state shown in FIG. 13 from one side surface side of the cutter main body. FIG. 3 is a perspective view of the state shown in FIG. 13 as viewed from the other side surface side of the cutter body. It is a side view which looked at the state shown in FIG. 13 from the direction which faces one side surface of a cutter body in the axial direction. It is a side view which looked at the state shown in FIG. 13 from the direction which faces the other side surface of the cutter body in the axial direction. It is a top view of the arrow line V direction view in FIG. It is a front view of the arrow line W direction view in FIG. FIG. 3 is an exploded perspective view of a cutter body, a mounting member body, a flange member, a clamp bolt, and a mounting screw in the state shown in FIG. FIG. 15 is an exploded perspective view of a cutter body, a mounting member body, a flange member, a clamp bolt, and a mounting screw in the state shown in FIG. FIG. 16 is a cross-sectional view taken along the line XX in FIG. FIG. 16 is a sectional view taken along line YY in FIG. FIG. 16 is a cross-sectional view taken along the line ZZZ in FIG.

1 to 4 show an embodiment of a slotting cutter with a coolant hole of the present invention, and FIGS. 5 to 12 show an embodiment of a mounting member for a slotting cutter with a coolant hole of the present invention. It shows. 13 to 24 show a state in which the slotting cutter with a coolant hole of the embodiment shown in FIGS. 1 to 4 is attached to the attachment member shown in FIGS. 5 to 12, and an exploded view thereof. is there.

The slotting cutter with a coolant hole of the present embodiment includes a disk-shaped cutter body 1 centered on the axis O made of a metal material such as a steel material. On the outer peripheral portion of the cutter main body 1, a plurality of (11 in this embodiment) tip pockets 2 that open substantially in a V shape on the outer peripheral side when viewed from the axis O direction and penetrate the cutter main body 1 in the axis O direction are provided. , Are formed at equal intervals in the circumferential direction. The bottom surface of the tip pocket 2 facing the outer peripheral side of the cutter main body 1 is formed so as to be curved toward the inner peripheral side of the cutter main body 1.

Such a slotting cutter with a coolant hole is attached to an arbor (not shown) attached to the spindle of the machine tool via the attachment member in a state of being attached to the attachment member described later, and the cutter rotation direction is about the axis O. By being rotated by T and being sent out in a direction intersecting the axis O, a narrow grooving is made in the work material by a cutting edge 3a provided at the outer peripheral end of the wall surface 2a facing the cutter rotation direction T of the chip pocket 2. Performs processing, parting and cutting of work materials. The cutting edge length of the cutting edge 3a in the axis O direction is larger than the thickness of the outer peripheral portion of the cutter body 1 in the axis O direction, and the outer periphery of the cutter body 1 is formed in the groove formed in the work material by the cutting edge 3a. The parts do not interfere.

Here, at the outer peripheral end of the wall surface 2a of these chip pockets 2 facing the cutter rotation direction T, the cutter body 1 penetrates the cutter body 1 in the axis O direction on the cutter rotation direction T side of the outer peripheral end. A concave groove-shaped insert mounting seat 4 extending to the inner peripheral side of the blade 3a is formed, and the cutting edge 3a has a higher hardness than the cutter body 1 such as cemented carbide that is detachably attached to the insert mounting seat 4. It is formed on the cutting insert 3. That is, the slotting cutter with a coolant hole of the present embodiment is a slotting cutter with a coolant hole having a replaceable cutting edge.

A first slit 4a extending from the insert mounting seat 4 to the inner peripheral side of the cutter body 1 is formed on the inner peripheral side of the insert mounting seat 4, and the first slit 4a is formed with the first slit 4a. An oval or elliptical hole 4b having a long axis in the direction in which the slit 4a extends is formed. Further, on the cutter rotation direction T side of the first slit 4a, a second slit 4c extending from the bottom surface of the chip pocket 2 facing the outer peripheral side of the cutter main body 1 to the inner peripheral side is formed.

In such an insert mounting seat 4, the shaft portion having an oval or elliptical cross section that can be fitted into the hole portion 4b of a work tool such as an L-shaped wrench (not shown) is aligned with the hole portion 4b. After fitting, the long axis of the shaft is rotated so as to overlap the short axis of the hole 4b, so that the insert mounting seat of the outer peripheral portion of the cutter body 1 between the chip pockets 2 adjacent in the circumferential direction The portion (upper jaw portion) on the cutter rotation direction T side between the first and second slits 4a and 4c of 4 is elastically deformed so as to be tilted toward the cutter rotation direction T side, and becomes the cutter rotation direction T of the insert mounting seat 4. The distance from the opposite part (lower jaw) is widened.

Therefore, in the state where the insert mounting seat 4 is expanded in this way, the cutting insert 3 is inserted into the insert mounting seat 4 from the outer peripheral side of the cutter body 1 with the cutting edge 3a facing the outer peripheral side, and then the length of the shaft portion of the work tool. When the work tool is rotated so that the shaft overlaps the long shaft of the hole 4b, the cutter rotation direction T side of the insert mounting seat 4 returns to the original state, and the cutting insert 3 is moved by the elastic force of the insert mounting seat 4. It is detachably fixed and attached to the insert mounting seat 4 so as to be sandwiched between the cutter rotation direction T and the portion on the opposite side.

In such an inner peripheral portion of the cutter body 1, a plurality of circular (four in the present embodiment) mounting holes 1a having the same diameter penetrating the cutter body 1 in the axis O direction are equal to the outer peripheral side from the axis O. It is formed at equal intervals in the circumferential direction at positions separated by a distance. Further, a through hole 1b having a diameter larger than that of the mounting hole 1a centered on the axis O is formed on the inner peripheral side of these mounting holes 1a, and the through hole 1b is formed on the outer peripheral portion of the through hole 1b. A key groove 1c that communicates with the key groove 1c is formed. In the present embodiment, the two key grooves 1c extend in the direction orthogonal to the axis O between the two mounting holes 1a adjacent to each other in the circumferential direction when viewed from the axis O direction.

Further, in the cutter main body 1, the same number of coolant holes 5 as the chip pocket 2 in the present embodiment are radiated straight lines from the inner peripheral portion of the cutter main body 1 as shown in FIGS. 3 and 4 when viewed from the axis O direction. It is formed so as to extend toward the outer peripheral side and open. These coolant holes 5 have a circular cross section, and on the outer peripheral portion of the cutter main body 1, the outer peripheral portion of the cutter main body 1 between the first and second slits 4a and 4c on the cutter rotation direction T side of the insert mounting seat 4 The bottom surface of the tip pocket 2 facing the side is opened so as to extend in the direction toward the cutting edge 3a of the cutting insert 3.

Furthermore, a coolant groove 6 communicating with these coolant holes 5 is formed on one side surface 1A of the two side surfaces 1A and 1B of the cutter body 1. Then, as shown in FIG. 3, the coolant groove 6 extends in the circumferential direction of the cutter main body 1 so that both ends thereof are spaced from the mounting hole 1a, and the first coolant groove 6A communicates with the coolant hole 5. , The mounting hole 1a is formed so as to be recessed toward the inner peripheral side of the cutter body 1 when viewed from the direction facing the one side surface 1A in the axis O direction, and connects both ends of the first coolant groove 6A. It is provided with a hole 1a and a second coolant groove 6B spaced apart from each other.

Therefore, by connecting both ends of the first coolant groove 6A by the second coolant groove 6B in this way, the coolant groove 6 does not open into the mounting hole 1a, the through hole 1b, and the key groove 1c. The inner peripheral portion of the cutter body 1 is formed so as to be continuous over the entire circumference around the axis O.

Here, the first coolant groove 6A is formed in an arc shape centered on the axis O, and is divided into four at a portion around the mounting hole 1a. Further, the radius from the axis O to the wall surface 6a of the first coolant groove 6A facing the inner peripheral side of the cutter body 1 is equal to or less than the radius of the circle circumscribing the mounting hole 1a centering on the axis O, and in particular, the axis. It is set to be equal to or less than the radius from O to the center line C of the mounting hole 1a, and in this embodiment, it is substantially equal to the radius from the axis O to the center line C of the mounting hole 1a.

Further, the second coolant groove portion 6B is an arc-shaped portion formed in an arc shape centered on the center line C of the mounting hole 1a when viewed from the direction facing the one side surface 1A of the cutter body 1 in the axis O direction. It has. In particular, in the present embodiment, the entire second coolant groove portion 6B has such an arcuate portion. The first and second coolant groove portions 6A and 6B have substantially the same groove width and depth, are formed in a rectangular cross section, and are formed so as to be recessed from the one side surface 1A.

As shown in FIGS. 5 to 8, the mounting members of the present embodiment to which such a slotting cutter with a coolant hole is mounted are a cylindrical mounting member main body 11 and a tip side of the mounting member main body 11 (FIGS. 5 and 8). It is provided with a disk-shaped flange member 12 as shown in FIGS. 9 to 12 attached to the lower side in FIG.

Like the cutter body 1, the mounting member main body 11 and the flange member 12 are formed of a metal material such as a steel material so that their outer diameters (diameters) are substantially equal to each other with the axis O as the center. The outer diameter (diameter) of the member 12 is slightly larger than the diameter of the circle that circulates around the axis O and circulates in the mounting hole 1a of the cutter body 1.

The inner peripheral portion of the mounting member main body 11 is a coolant supply hole 11A, and the coolant supply hole 11A has the largest inner diameter at the rear end portion, and the rear end portion is formed at the tip end portion of the above-mentioned arbor. It is a fitting hole 11a that is fitted into a cylindrical convex portion. Further, as shown in FIGS. 21 to 23, an insertion hole 11b having the smallest inner diameter into which the screw shaft portion 13a of the clamp bolt 13 is inserted is formed on the tip end side of the fitting hole 11a.

Furthermore, an accommodating hole 11c is formed on the distal end side of the insertion hole 11b so as to open to the distal end surface of the mounting member main body 11 and accommodate the head portion 13b of the clamp bolt 13. The inner diameter of the accommodating hole 11c is larger than that of the insertion hole 11b and smaller than that of the fitting hole 11a. The inner diameters of the fitting hole 11a, the insertion hole 11b, and the accommodating hole 11c are each of a constant size.

As shown in FIGS. 22 to 24, an engaging hole portion 13c having a regular hexagonal cross section is formed on the tip surface of the head portion 13b of the clamp bolt 13 to engage with a work tool such as a hexagonal wrench. From the bottom surface of the engaging hole portion 13c facing the tip side to the rear end surface of the screw shaft portion 13a, a flow hole 13d through which coolant having a circular cross section smaller in diameter than the circle inscribed in the engaging hole portion 13c flows is formed. There is. Further, on the rear end surface of the mounting member main body 11, a key groove 11B that extends in the radial direction with respect to the axis O and communicates with the fitting hole 11a and that fits with the key formed at the tip of the arbor is formed.

In such a mounting member main body 11, with the cutter main body 1 and the flange member 12 removed, the cylindrical convex portion at the tip of the arbor is fitted into the fitting hole 11a of the coolant supply hole 11A. The key is fitted into the key groove 11B, and the screw shaft portion 13a of the clamp bolt 13 inserted from the accommodating hole 11c into the insertion hole 11b is screwed into the clamp screw hole formed in the center of the convex portion of the arbor. It is attached to the tip. Further, by screwing the clamp bolt 13, the head portion 13b of the clamp bolt 13 presses the bottom surface facing the tip end side of the accommodating hole 11c, and the mounting member main body 11 is fixed to the tip end portion of the arbor.

On the tip surface of the mounting member main body 11, an annular wall portion 11d protruding from the tip surface and fitted into the through hole 1b of the cutter main body 1 is formed on the outer periphery of the opening of the accommodating hole 11c of the coolant supply hole 11A. Has been done. Further, on the outer peripheral side of the annular wall portion 11d, an annular groove portion 11e recessed from the tip surface of the mounting member main body 11 is formed adjacent to the annular wall portion 11d.

Here, the protruding height of the annular wall portion 11d from the tip end surface of the mounting member main body 11 is smaller than the thickness of the inner peripheral portion of the cutter main body 1 in the axis O direction. Further, on the outer peripheral side of the annular groove portion 11e, the same number (4) of mounting screw holes 11f as the mounting holes 1a of the cutter body 1 are coaxial with the center line C of the mounting holes 1a in a state where the axis lines O are aligned. It is formed at equal intervals in the circumferential direction so as to communicate with.

The outer peripheral portion of the tip surface of the mounting member main body 11 other than the annular wall portion 11d, the annular groove portion 11e, and the opening of the mounting screw hole 11f is formed in a flat shape perpendicular to the axis O. Further, a key fitted in the key groove 1c communicating with the through hole 1b of the cutter body 1 may be formed on the outer peripheral side of the annular groove portion 11e on the tip surface of the mounting member body 11, but the cutter body 1 will be described later. Such a key is not formed in the present embodiment because it is prevented from rotating by the mounting screw 14.

Further, the flange member 12 also has the same number (4) of mounting screw insertion holes 12a as the mounting holes 1a of the cutter body 1 at equal intervals in the circumferential direction so as to communicate coaxially with the center line C of the mounting holes 1a. It is formed. Then, on the rear end surface of the flange member 12, a recess 12b whose inner peripheral portion communicates with the through hole 1b of the cutter body 1 and whose outer peripheral portion communicates with the coolant groove 6 avoids the mounting screw insertion hole 12a. It is formed so as to be recessed from the rear end surface of the flange member 12. The rear end surface of the flange member 12 other than the recess 12b and the opening of the mounting screw insertion hole 12a and the front end surface of the flange member 12 are formed in a flat shape perpendicular to the axis O.

Here, the wall surface 12c of the recess 12b facing the inner peripheral side of the flange member 12 when viewed from the direction facing the rear end surface of the flange member 12 in the axis O direction is as shown in FIG. 12 in the present embodiment. Dimensions congruent with the wall surfaces 6a and 6b of the first and second coolant groove portions 6A and 6B of the coolant groove 6 facing the inner peripheral side of the cutter body 1 when viewed from the direction facing the one side surface 1A in the axis O direction. And is formed in shape.

Such a flange member 12 and a cutter body 1 are the circle of the mounting member body 11 fixed to the tip of the arbor as described above with the cutter body 1 facing the one side surface 1A toward the tip side. The annular wall portion 11d is fitted into the through hole 1b so that the other side surface 1B of the cutter body 1 is brought into contact with the tip surface of the mounting member body 11 and the mounting hole 1a is coaxial with the mounting screw hole 11f. The flange member 12 is arranged on the inner peripheral portion of one side surface 1A of the cutter body so that the mounting screw insertion hole 12a is coaxial with the mounting hole 1a and the mounting screw hole 11f.

Then, from the state where the cutter body 1 and the flange member 12 are arranged at the tip of the mounting member body 11 in this way, the mounting screws 14 are inserted into the mounting screw insertion holes 12a and the mounting holes as shown in FIGS. 17 and 20. By screwing into the mounting screw hole 11f through 1a, the cutter main body 1 is fixed and mounted so as to be sandwiched between the flange member 12 and the tip end portion of the mounting member main body 11.

With the cutter body 1 and the flange member 12 attached to the tip of the mounting member body 11 attached to the tip of the arbor as described above, the cutter body 1 is rotated around the axis O while being rotated. When the cutting edge 3a is used to perform grooving, parting off, or cutting of a work material, coolant is supplied from the machine tool to the clamp screw hole of the arbor. This coolant may be a gas such as compressed air or a liquid such as a cutting fluid.

The coolant supplied to the clamp screw holes in this way is supplied to the accommodating holes 11c of the coolant supply holes 11A of the mounting member main body 11 through the flow holes 13d and the engagement holes 13c of the clamp bolts 13. Further, the coolant supplied to the accommodating hole 11c of the coolant supply hole 11A flows into the recess 12b of the flange member 12 through the through hole 1b of the cutter body 1, and then flows to the outer peripheral portion of the recess 12b to the rear in the axis O direction. It is supplied to the coolant groove 6 toward the end side, is supplied to the coolant hole 5 from the coolant groove 6, and is ejected from the outer peripheral portion of the cutter main body 1.

Here, in the slotting cutter with a coolant hole having the above configuration, the coolant groove 6 formed in the cutter body 1 extends in the circumferential direction of the cutter body 1 so that both ends are spaced from the mounting hole 1a. A first coolant groove 6A communicating with the fifth coolant groove 6A and a second coolant groove 6B connecting both ends of the first coolant groove 6A and also spaced from the mounting hole 1a are provided, as described above. The inner peripheral portion of the cutter body 1 is formed so as to be continuous over the entire circumference.

Therefore, even if the first coolant groove 6A is divided in the circumferential direction of the cutter body 1 by the mounting hole 1a, the amount of coolant supplied to the coolant groove 6 can be secured, and the coolant hole from the coolant groove 6 can be secured. It is possible to prevent the pressure of the coolant supplied to No. 5 from being biased. Therefore, according to the slotting cutter with a coolant hole configured as described above, sufficient coolant can be ejected from the coolant hole 5 at a uniform pressure, so that the chips generated by the cutting edge 3a can be reliably removed. Further, it becomes possible to efficiently cool and lubricate the cutting edge 3a.

Further, in the slotting cutter with a coolant hole having the above configuration, the second coolant groove 6B is formed around the mounting hole 1a when viewed from the direction facing the one side surface 1A of the cutter body 1 in the axis O direction. It is formed so as to be recessed on the inner peripheral side. Therefore, it is possible to prevent the coolant groove 6 from protruding to the outer peripheral side of the circle circumscribing the mounting hole 1a around the axis O of the cutter body 1, so that the mounting member body 11 of the mounting member to which the cutter body 1 is mounted can be prevented. It is possible to prevent the outer diameter of the tip portion and the flange member 12 from becoming large, and it is possible to secure a sufficient cutting depth in the cutting edge 3a provided at the outer peripheral end of the cutter body 1.

Further, in the present embodiment, an arcuate portion formed in the second coolant groove portion 6B in an arc shape centered on the center line C of the mounting hole 1a when viewed from the direction facing the one side surface 1A in the axis O direction. Is provided. Therefore, since the distance from the mounting hole 1a can be kept constant in this arcuate portion, the strength of the cutter body 1 can be maintained. In particular, in the present embodiment, the entire second coolant groove 6B is formed as an arc-shaped portion centered on the center line C of the mounting hole 1a, so that the entire second coolant groove 6B is the mounting hole 1a. The strength can be maintained by keeping the interval between the two.

On the other hand, in the present embodiment, the first coolant groove 6A of the coolant groove 6 is formed in an arc shape centered on the axis O, and the first coolant groove 6A facing the inner peripheral side of the cutter body 1 from the axis O. The radius to the wall surface 6a is equal to or less than the radius of the circle circumscribing the mounting hole 1a about the axis O.

Therefore, it is possible to secure a larger length of the first coolant groove 6A in the circumferential direction within a range in which the cutting depth of the cutting edge 3a is not impaired, and to supply more stable coolant to the coolant hole 5. be able to. In order to ensure such an effect, it is desirable that the first coolant groove 6A extends between a circle circumscribing the mounting hole 1a and a circle inscribed around the axis O.

Further, in the present embodiment, as described above, the entire second coolant groove 6B is formed into the arcuate portion, and the wall surface 6a of the first coolant groove 6A facing the inner peripheral side of the cutter body 1 from the axis O. The radius up to is set to be equal to or less than the radius from the axis O to the center line C of the mounting hole 1a, and in particular, is substantially equal to the radius to the center line C.

Therefore, while ensuring the length of the first coolant groove 6A in the circumferential direction, the first and second coolant grooves 6A and 6B have an acute angle at the connecting portion of the first and second coolant grooves 6A and 6B. Since it does not intersect, it is possible to prevent the coolant pressure from being biased at such an acute-angled connection portion.

The second coolant groove 6B has an arcuate shape centered on the center line C as described above, and also has a U shape when viewed from the direction facing the one side surface 1A. The connecting portion connected to the first coolant groove portion 6A may be formed in a convex curved shape such as a convex arc that is convex toward the mounting hole 1a.

Further, in the present embodiment, the cutting insert 3 having the cutting edge 3a formed on the insert mounting seat 4 formed on the outer peripheral portion of the cutter body 1 is detachably attached to the slotting cutter with a coolant hole with a replaceable cutting edge. The case where the present invention is applied has been described. For example, a brazing type slotting cutter with a coolant hole in which such a cutting insert 3 is joined to the outer peripheral portion of the cutter body by brazing or the like, or a cutting cutter body 1 is cut on the outer peripheral portion. It is also possible to apply the present invention to a solid type slotting cutter with a coolant hole in which the blade is directly formed.

On the other hand, in the mounting member of the slotting cutter with a coolant hole of the present embodiment, a coolant supply hole 11A communicating with the through hole 1b of the cutter body 1 is formed in the inner peripheral portion, and the coolant supply hole 11A communicates with the mounting hole 1a on the tip surface. A flange in which a mounting member main body 11 having a mounting screw hole 11f formed and a mounting screw insertion hole 12a communicating with the mounting hole 1a are formed so as to sandwich the cutter main body 1 between the tip surface of the mounting member main body 11. A member 12 is provided, and a recess 12b is formed on the rear end surface of the flange member 12 so that the inner peripheral portion communicates with the through hole 1b and the outer peripheral portion communicates with the coolant groove 6.

Therefore, according to the mounting member of the present embodiment, if any part of the recess 12b of the flange member 12 is open in the coolant groove 6, the coolant is supplied from the coolant groove 6 of the cutter body 1 to the coolant hole 5. Therefore, high processing accuracy and connection accuracy are not required for the alignment of the cutter body 1 with the mounting member body 11 and the flange member 12 of the mounting member in the circumferential direction.

Further, since the mounting member main body 11 of the mounting member may be cylindrical as described above, it takes a lot of time to form the coolant supply hole 11A, as in the case where the coolant supply hole 11A is formed in an inclined manner. No labor or cost is required. Moreover, by temporarily holding the coolant in the recess 12b of the flange member 12, the pressure of the coolant ejected from the coolant hole 5 through the coolant groove 6 of the cutter body 1 can be further made uniform.

Further, in the mounting member of the present embodiment, the wall surface 12c of the recess 12b facing the inner peripheral side of the flange member 12 when viewed from the direction facing the rear end surface in the axis O direction is one side surface 1A in the axis O direction. The coolant grooves 6 are formed to have the same shape and dimensions as the wall surfaces 6a and 6b of the first and second coolant grooves 6A and 6B facing the inner peripheral side of the cutter body 1 when viewed from the direction facing the cutter body 1. Therefore, even when the coolant flows into the coolant groove 6 from the recess 12b, it is possible to prevent the coolant pressure from being biased, and it is possible to efficiently supply the coolant to the coolant groove 6 and the coolant hole 5. ..

However, in the present embodiment, the wall surface 12c of the recess 12b facing the inner peripheral side of the flange member 12 when viewed from the direction facing the rear end surface in the axis O direction is from the direction facing one side surface 1A. It is formed in the same shape and dimensions as the wall surfaces 6a and 6b of the first and second coolant grooves 6A and 6B of the coolant groove 6 facing the inner peripheral side of the cutter body 1 when viewed, but in the axis O direction. It may have a similar shape larger than the wall surfaces 6a and 6b of the coolant groove 6 facing the inner peripheral side of the cutter body 1 when viewed from the direction facing one side surface 1A.

Further, in the present embodiment, on the tip surface of the mounting member main body 11, the annular wall portion 11d protruding from the tip surface and fitted into the through hole 1b of the cutter main body 1 is the opening of the accommodating hole 11c of the coolant supply hole 11A. It is formed on the outer circumference of. Therefore, the cutter body 1 can be reliably positioned in the radial direction with respect to the axis O, so that high-precision grooving can be performed.

Moreover, in the present embodiment, an annular groove portion recessed from the tip surface of the mounting member body 11 adjacent to the outer peripheral side of the annular wall portion 11d formed on the tip surface of the mounting member body 11. 11e is formed. Therefore, the corner portion where the tip surface of the mounting member body 11 and the outer peripheral surface of the annular wall portion 11d intersect interferes with the other side surface 1B of the cutter body 1 that abuts on the tip surface of the mounting member body 11. Therefore, the cutter main body 1 can be stably attached to the attachment member main body 11.

If the position of the first coolant groove 6A coincides with the coolant supply hole, the cutter body 1 of the slotting cutter with a coolant hole of the above embodiment can be attached to, for example, the mounting member described in Patent Documents 1 and 2. On the other hand, it is possible to mount one side surface 1A toward the mounting member side. In this case, the cutter rotation direction T may be opposite to that of the above embodiment.

On the contrary, in the slotting cutter with a coolant hole described in Patent Documents 1 and 2, if the position of the inlet opening coincides with the recess 12b of the flange member 12, the inlet opening opens. It is also possible to attach the cutter body to the attachment member of the above embodiment with the side surface of the cutter body facing the tip side (flange member 12 side). In this case as well, the cutter rotation direction T may be the opposite direction to that of the above embodiment.

Further, in the above embodiment, the mounting member of the slotting cutter with a coolant hole of the present invention is applied to a shell-type mounting member in which the mounting member main body 11 is mounted by a clamp bolt 13 on an arbor mounted on a spindle of a machine tool. Although the case has been described, even if the mounting member is provided with a cylindrical mounting member body as in the shell type mounting member, the mounting member body is used, for example, in a slotting cutter with a small diameter coolant hole. It is also possible to apply the present invention to a shank-type mounting member that is directly mounted on the spindle of a machine tool without using an arbor.

1 Cutter body 1A One side surface of cutter body 1 1B Another side surface of cutter body 1 1a Mounting hole 1b Through hole 2 Chip pocket 2a Wall surface of chip pocket 2 facing the cutter rotation direction T 3 Cutting insert 3a Cutting blade 4 Insert mounting seat 5 Coolant hole 6 Coolant groove 6A 1st coolant groove 6B 2nd coolant groove 6a Wall surface of 1st coolant groove 6A facing the inner peripheral side of the cutter body 1 6b 2nd coolant facing the inner peripheral side of the cutter body 1 Groove 6B wall surface 11 Mounting member body 11A Coolant supply hole 11a Fitting hole 11b Insertion hole 11c Accommodation hole 11d Circular wall 11e Circular groove 11f Mounting screw hole 12 Flange member 12a Mounting screw insertion hole 12b Recess 12c Flange member 12 Wall surface of recess 12b facing the inner circumference 13 Clamp bolt 13a Screw shaft of clamp bolt 13 13b Head of clamp bolt 13 13c Engagement hole 13d Flow hole 14 Mounting screw O Axis of cutter body 1 T Cutter rotation direction C Mounting Center line of hole 1a

Claims (9)

A chip pocket is formed on the outer peripheral portion of a disk-shaped cutter body centered on the axis that is rotated in the cutter rotation direction around the axis, and the above is formed on the outer peripheral edge of the wall surface of the chip pocket facing the cutter rotation direction. A cutting edge having a cutting edge length in the axial direction larger than the thickness of the outer peripheral portion of the cutter main body in the axial direction is provided, and the cutter main body extends from the inner peripheral portion of the cutter main body to the outer peripheral side and opens. A slotting cutter with a coolant hole in which a coolant hole is formed.
A mounting hole that penetrates the cutter body in the axial direction is formed on the inner peripheral portion of the cutter body away from the axis on the outer peripheral side, and the cutter body is formed on one of the two side surfaces. A coolant groove is formed that communicates with the coolant hole,
The coolant groove faces the first side surface in the axial direction of the first coolant groove, which extends in the circumferential direction of the cutter body so that both ends are spaced from the mounting hole and communicates with the coolant hole. A second coolant spaced apart from the mounting hole, which is formed so as to be recessed on the inner peripheral side of the cutter body and connects both ends of the first coolant groove when viewed from the direction of the first coolant groove. A slotting cutter with a coolant hole, which is provided with a groove portion and is formed so as to have an inner peripheral portion of the cutter body continuous over the entire circumference around the axial line. The second coolant groove portion is characterized by including an arc-shaped portion formed in an arc shape centered on the center line of the mounting hole when viewed from the direction facing the one side surface in the axial direction. The slotting cutter with a coolant hole according to claim 1. The slotting cutter with a coolant hole according to claim 2, wherein the second coolant groove portion has an arcuate portion as a whole. The first coolant groove portion is formed in an arc shape centered on the axis line, and the radius from the axis line to the wall surface of the first coolant groove portion facing the inner peripheral side of the cutter body is centered on the axis line. The slotting cutter with a coolant hole according to any one of claims 1 to 3, wherein the radius is equal to or less than the radius of a circle circumscribing the mounting hole. 4. The fourth aspect of the present invention is that the radius from the axis line to the wall surface of the first coolant groove portion facing the inner peripheral side of the cutter body is equal to or less than the radius from the axis line to the center line of the mounting hole. Slotting cutter with coolant holes as described in. The slotting cutter with a coolant hole according to any one of claims 1 to 5, in which a through hole is formed on the inner peripheral side of the coolant groove of the cutter body, has one side surface on the tip side. It is a mounting member for a slotting cutter with a coolant hole that can be mounted toward it.
It is formed in a cylindrical shape centered on the axis, and with the axis coaxial, a coolant supply hole that communicates with the through hole is formed in the inner peripheral portion, and a coolant supply hole that communicates with the mounting hole is formed on the tip surface. The mounting member body with mounting screw holes and the mounting member body
A mounting screw insertion hole is formed that is formed in a disk shape centered on the axis and communicates with the mounting hole in a state where the axis is coaxial, and the mounting is inserted through the mounting hole through the mounting screw insertion hole. A flange member for mounting the cutter body by being screwed into the mounting screw hole so as to be sandwiched between the cutter body and the tip surface of the mounting member body is provided.
On the rear end surface of the flange member facing the mounting member main body side, the inner peripheral portion communicates with the through hole, and the outer peripheral portion communicates with the coolant groove. A mounting member for a slotting cutter with a coolant hole, characterized in that it is formed to avoid it. The wall surface of the recess facing the inner peripheral side of the flange member when viewed from the direction facing the rear end surface in the axial direction is the cutter when viewed from the direction facing the one side surface in the axial direction. It is larger than the wall surface of the coolant groove that faces the inner peripheral side of the cutter body when it is combined with the wall surface of the coolant groove facing the inner peripheral side of the main body or when viewed from the direction facing the one side surface in the axial direction. The mounting member for a slotting cutter with a coolant hole according to claim 6, wherein the slotting cutter has a similar shape. The tip surface of the mounting member main body is characterized in that an annular wall portion that protrudes from the tip surface and is fitted into the through hole of the cutter main body is formed on the outer periphery of the opening of the coolant supply hole. The mounting member for a slotting cutter with a coolant hole according to claim 6 or 7. The slot with a coolant hole according to claim 8, wherein an annular groove portion recessed from the tip surface is formed adjacent to the outer peripheral side of the annular wall portion on the tip surface of the mounting member main body. Mounting member for the ting cutter.

Images