JP7494466B2 - Mounting material for slotting cutter with coolant holes - Google Patents

Description

The present invention relates to a mounting member for a slotting cutter with coolant holes for mounting a slotting cutter with coolant holes to an arbor or the like, the slotting cutter having a disk-shaped cutter body centered on an axis that is rotated in the cutter rotation direction about the axis, the outer periphery of which is provided with cutting blades whose cutting blade length in the axial direction is greater than the thickness of the outer periphery of the cutter body, and the cutter body has a coolant hole that extends from the inner periphery of one of the two side surfaces of the cutter body and opens inside the cutter body to the outer periphery, and a through hole formed on the inner periphery side of the opening of the coolant hole on the one side surface.

A slotting cutter in which a cutting blade whose axial length is greater than the thickness of the outer periphery of the cutter body is provided on the outer periphery in this way is used to make narrow grooves in the workpiece by cutting the outer periphery of the cutter body provided with this cutting blade into the workpiece, or is used for parting off or cutting the workpiece. Because the axial length of the cutting blade is greater than the thickness of the outer periphery of the cutter body, the outer periphery of the cutter body does not interfere with the groove formed by the cutting blade.

For example, Patent Document 1 describes such a slotting cutter as a slot milling disk having a central axis, an outer peripheral surface with multiple cutting edges, a first side surface having a support surface around the central axis, a second side surface opposite the first side surface, and mounting means adapted to interact with a mating mounting means of a rotatable mounting shaft to non-rotatably mount the slot milling disk to the mounting shaft and to press the support surface against a mounting surface on the end face of the mounting shaft.

Furthermore, the slotting cutter described in this patent document is provided with at least one injection supply fluid passage (coolant hole) having a sealed cross section and extending from an inlet opening in the support surface of the slot milling disc to at least one outlet opening in the outer peripheral surface of the slot milling disc, the support surface being a plane on the first side of the slot milling disc and extending perpendicular to the central axis, the inlet opening forming a blind hole in the flat support surface, and the injection supply fluid passage extending in a direction toward the outer peripheral surface of the slot milling disc.

In addition, this patent document 1 describes a mounting shaft (mounting member for a slotting cutter with coolant holes) for mounting such a slotting cutter with coolant holes to an arbor or the like that is attached to the spindle of a machine tool, which is a rotatable mounting shaft for mounting the cutter in a rotatable manner to the machine tool, and which is rotatable around a central axis.

The mounting member described in this patent includes mounting means adapted to interact with a mating mounting means of the slot milling disk to press a support surface on a first side of the slot milling disk against a mounting surface at an end face of the rotatable mounting shaft perpendicular to the central axis, and a supply opening in the mounting surface that is in fluid communication with a fluid passage within the rotatable mounting shaft and is shaped and positioned to allow the supply of a jet supply fluid from the fluid passage to an inlet opening of the slot milling disk.

On the other hand, Patent Document 2 also describes a slotted milling disk, also as a slotting cutter with coolant holes, which includes an outer peripheral surface provided with several cutting edges, a means configured to enable anti-rotation mounting of the slotted milling disk on a rotatable mounting shaft, and at least one flushing fluid channel (coolant hole) having a limited cross section and extending inside the milling disk from an inlet opening arranged in the center of the disk and configured to be connected to a flushing fluid source to at least one outlet opening on the outer peripheral surface of the disk.

Furthermore, in the slotting cutter with coolant holes described in Patent Document 2, at least one flushing fluid channel includes an inner channel portion that extends from an inlet opening toward the outer peripheral surface and terminates before reaching the outer peripheral surface, and at least one outer channel portion that extends from the inner channel portion while changing the direction of the flushing fluid channel in a manner that is inclined toward the cutting edge, and extends to at least one outlet opening.

This patent also describes, as a mounting member for a slotting cutter with coolant holes, a rotatable mounting shaft that is mounted in an anti-rotational manner on an upper slot milling disk, the shaft including a supply opening in an end face of the shaft that is in fluid communication with a fluid channel inside the shaft and that is shaped and positioned to allow the supply of flushing fluid from the fluid channel to an inlet opening of the slot milling disk.

Patent No. 6526987 JP 2018-534158 A

In the slotting cutters with coolant holes described in Patent Documents 1 and 2, as shown in Figures 3 to 6 and 8 of Patent Document 1 and Figures 3 to 5 of Patent Document 2, the radius from the axis of the cutter body to the inlet opening is within the range of the radius of a circle inscribed and circumscribed around the screw hole for attaching the cutter body to the mounting member, with the axis of the cutter body as its center, and this divides the inlet opening into multiple parts.

In addition, in the mounting members for the slotting cutters with coolant holes described in Patent Documents 1 and 2, the flow paths (coolant supply holes) that supply coolant to the inlet opening divided into multiple parts of the cutter body are also branched into multiple parts. However, high machining and connection accuracy are required to supply coolant by precisely aligning the multiple branched flow paths and the inlet opening in the circumferential direction.

Moreover, the flow passages in the mounting members of the slotting cutters with coolant holes described in Patent Documents 1 and 2 are inclined with respect to the axis so as to move toward the outer periphery as they approach the tip. However, forming such inclined flow passages in the mounting member requires a lot of time, effort, and cost.

In addition, in the slotting cutters with coolant holes described in Patent Documents 1 and 2, in which the inlet opening is formed in a groove shape, the number of coolant holes branching off from these divided inlet openings is also different. This can cause a bias in the pressure of the coolant sprayed from each coolant hole, making it difficult to reliably remove chips and cool and lubricate the cutting edge.

The present invention was made against this background, and aims to provide a mounting member for a slotting cutter with a coolant hole that can connect the coolant supply hole to the coolant hole in the cutter body without high machining precision, connection precision, or requiring a lot of time, effort, or cost, and can prevent uneven pressure of the coolant sprayed from the coolant hole, ensuring reliable removal of chips and cooling and lubrication of the cutting edge.

In order to solve the above problems and achieve the above object, the present invention provides a slotting cutter with a coolant hole, in which a chip pocket is formed on the outer periphery of a disk-shaped cutter body centered on the axis which is rotated in the cutter rotation direction around the axis, and a cutting blade is provided on the outer periphery end of the wall surface of the chip pocket facing the cutter rotation direction, the cutting blade having a cutting blade length in the axial direction greater than the thickness in the axial direction of the outer periphery of the cutter body, and the cutter body has a coolant hole extending from the inner periphery of one of the two side surfaces of the cutter body to open inside the cutter body to the outer periphery, and a through hole is formed on the inner periphery side of the opening of the coolant hole on the one side, and the one side is provided with a cutting blade having a cutting blade length in the axial direction greater than the thickness in the axial direction of the outer periphery of the cutter body. The mounting member for a slotting cutter with a coolant hole is attached toward the tip side, and includes a mounting member main body formed in a cylindrical shape centered on the axis and having a coolant supply hole formed in the inner periphery that communicates with the through hole with the axis being coaxial, and a flange member formed in a disk shape centered on the axis and attached so as to sandwich the cutter main body between the tip surface of the mounting member main body with the axis being coaxial, and is characterized in that the rear end surface of the flange member facing the mounting member main body has a recess formed therein, the inner periphery of which communicates with the through hole and the outer periphery of which communicates with the opening of the coolant hole in the inner periphery of the cutter main body.

In the mounting member for the slotting cutter with coolant hole configured in this way, the coolant supplied to the coolant supply hole on the inner circumference of the mounting member body passes through the through hole of the cutter body and flows into a recess formed in the rear end face of the flange member facing the mounting member side. The coolant that flows into this recess then flows from the outer circumference of the recess into the opening of the coolant hole on the inner circumference of one side of the cutter body and is supplied to the outer circumference side, and is sprayed onto the outer circumference of the cutter body to remove chips and cool and lubricate the cutting edge.

Therefore, in the mounting member for the slotting cutter with coolant hole having the above configuration, if the recess of this flange member opens into the opening of the coolant hole on the inner periphery of one side of the cutter body, coolant can be supplied to the coolant hole of the cutter body. For this reason, high machining precision or connection precision is not required for circumferential alignment of the recess and the opening of the coolant hole.

In addition, since the mounting member body only needs to be cylindrical, there is no need to form the coolant supply hole at an angle, and it does not take much time, effort, or cost to form such an inclined coolant supply hole. Moreover, by temporarily holding the coolant in the recess of the flange member, it is possible to prevent the pressure of the coolant ejected from the coolant hole in the cutter body from becoming uneven, making it possible to equalize the ejection pressure of the coolant and ensure the removal of chips and the cooling and lubrication of the cutting edge. The mounting member for the slotting cutter with coolant hole of the present invention can be applied to a shell-type mounting member in which the mounting member body is attached to the spindle of the machine tool via an arbor, or a shank-type mounting member in which the mounting member body is directly attached to the spindle of the machine tool.

Here, when the opening of the coolant hole in the inner peripheral portion of the cutter body is a coolant groove formed in a groove shape recessed from the one side surface, the wall surface of the recess facing the inner peripheral side of the flange member when viewed from the direction facing the rear end face in the axial direction is made to be congruent with the wall surface of the coolant groove facing the inner peripheral side of the cutter body when viewed from the direction facing the one side surface in the axial direction, or made to be larger and similar in shape to the wall surface of the coolant groove facing the inner peripheral side of the cutter body when viewed from the direction facing the one side surface in the axial direction, thereby enabling efficient supply of coolant from the recess to the coolant groove and the coolant hole.

In addition, by forming an annular wall portion on the outer periphery of the opening of the coolant supply hole, which protrudes from the tip surface of the mounting member body and is fitted into the through hole of the cutter body, the cutter body can be reliably positioned in the radial direction relative to the axis, making it possible to perform highly accurate groove cutting.

Furthermore, when an annular wall portion is formed on the tip surface of the mounting member body in this manner, an annular groove recessed from the tip surface of the mounting member body can also be formed adjacent to the outer periphery of the annular wall portion on the tip surface of the mounting member body. This prevents the corner where the tip surface of the mounting member body and the outer periphery of the annular wall portion intersect from interfering with the other side of the cutter body that will come into contact with the tip surface, making it possible to stably attach the cutter body to the mounting member body.

As explained above, the present invention does not require high machining precision or precision in connection with a slotting cutter with coolant holes, and also reduces the time, labor, and cost required for manufacturing. It is possible to reliably connect the coolant supply hole to the coolant hole in the cutter body to supply coolant, and it is possible to equalize the coolant ejection pressure, which allows for reliable removal of chips and cooling and lubrication of the cutting edge.

FIG. 1 is a perspective view seen from one side of a cutter body, showing an example of a slotting cutter with coolant holes that is attached to one embodiment of a mounting member for a slotting cutter with coolant holes of the present invention. 2 is a perspective view of the cutter body of the slotting cutter with coolant holes shown in FIG. 1 as viewed from the other side surface side. FIG. 2 is a side view of the slotting cutter with coolant holes shown in FIG. 1, viewed from a direction opposing one side surface of the cutter body in the axial direction. FIG. 2 is a side view of the slotting cutter with coolant holes shown in FIG. 1, viewed from a direction opposing the other side surface of the cutter body in the axial direction. FIG. FIG. 2 is a perspective view showing a mounting member main body in one embodiment of the mounting member for the slotting cutter with coolant holes of the present invention. FIG. 7 is a side view of the mounting member main body shown in FIG. 6 . 7 is a bottom view of the mounting member body shown in FIG. 6 as viewed from the axial tip side. FIG. 7 is a plan view of the mounting member main body shown in FIG. 6 as viewed from the axial rear end side. FIG. 2 is a perspective view showing a flange member in one embodiment of a mounting member for a slotting cutter with coolant holes according to the present invention. FIG. 10 is a side view of the flange member shown in FIG. 9 . 10 is a bottom view of the flange member shown in FIG. 9 as viewed from the axial tip side. FIG. 7 is a plan view of the flange member shown in FIG. 6 as viewed from the axial rear end side. FIG. 14 is attached to the mounting member shown in FIGS. 5 to 13. FIG. 14 is a perspective view of the cutter body as viewed from one side. FIG. 14 is another perspective view of the state shown in FIG. 13 as viewed from one side of the cutter body. FIG. 14 is a perspective view of the state shown in FIG. 13 as viewed from the other side of the cutter body. FIG. 14 is a side view of the state shown in FIG. 13 as viewed from a direction opposing one side surface of the cutter body in the axial direction. FIG. 14 is a side view of the state shown in FIG. 13 as viewed from a direction opposing the other side surface of the cutter body in the axial direction. FIG. FIG. 17 is a plan view seen in the direction of the arrow V in FIG. 16 . FIG. 17 is a front view taken in the direction of the arrow W in FIG. 16 . 14 is an exploded perspective view of the cutter body, the mounting member body, the flange member, the clamp bolt, and the mounting screw in the state shown in FIG. 13 . 16 is an exploded perspective view of the cutter body, the mounting member body, the flange member, the clamp bolt, and the mounting screw in the state shown in FIG. 15 . This is a cross-sectional view taken along the line XX in Figure 16. 17 is a cross-sectional view taken along the line Y-Y in FIG. 16 . This is a ZZZ cross-sectional view of Figure 16.

Figures 1 to 4 show an example of a slotting cutter with coolant holes that is attached to one embodiment of the mounting member of the slotting cutter with coolant holes of the present invention shown in Figures 5 to 12, and Figures 5 to 12 show one embodiment of the mounting member of the slotting cutter with coolant holes of the present invention. Also, Figures 13 to 24 show the state in which the slotting cutter with coolant holes shown in Figures 1 to 4 is attached to the mounting member of the embodiment shown in Figures 5 to 12, and an exploded view of the state.

The slotting cutter with coolant holes in the above example has a disk-shaped cutter body 1 made of a metal material such as steel and centered on the axis O. On the outer periphery of this cutter body 1, a plurality of chip pockets 2 (11 in this embodiment) are formed at equal intervals in the circumferential direction, opening to the outer periphery in a roughly V-shape when viewed from the direction of the axis O and penetrating the cutter body 1 in the direction of the axis O. The bottom surface of the chip pocket 2 facing the outer periphery of the cutter body 1 is formed so as to be concave toward the inner periphery of the cutter body 1.

One such example of a slotting cutter with coolant holes is attached to an arbor (not shown) that is attached to the spindle of a machine tool via a mounting member of an embodiment described below, and is rotated around axis O in cutter rotation direction T while being sent out in a direction intersecting axis O, so that the cutting blade 3a provided on the outer peripheral end of the wall surface 2a of the chip pocket 2 facing the cutter rotation direction T performs narrow groove processing on the workpiece, or performs parting off or cutting of the workpiece. The cutting blade length in the direction of axis O of the cutting blade 3a is made larger than the thickness in the direction of axis O of the outer periphery of the cutter body 1, so that the outer periphery of the cutter body 1 does not interfere with the groove formed in the workpiece by the cutting blade 3a.

Here, at the outer peripheral end of the wall surface 2a of these chip pockets 2 facing the cutter rotation direction T, a groove-shaped insert mounting seat 4 is formed on the cutter rotation direction T side of this outer peripheral end, penetrating the cutter body 1 in the axial O direction and extending to the inner peripheral side of the cutter body 1, and the above-mentioned cutting edge 3a is formed on a cutting insert 3 of a hard metal or the like that is harder than the cutter body 1 and is detachably attached to this insert mounting seat 4. In other words, this example of a slotting cutter with coolant holes is a slotting cutter with replaceable cutting edge and coolant holes.

A first slit 4a is formed on the inner periphery of the insert mounting seat 4, which extends from the insert mounting seat 4 further toward the inner periphery of the cutter body 1, and an oval or elliptical hole 4b having a major axis in the direction in which the first slit 4a extends is formed in the first slit 4a. In addition, a second slit 4c is formed on the side of the first slit 4a in the cutter rotation direction T, which extends from the bottom surface of the chip pocket 2 facing the outer periphery of the cutter body 1 toward the inner periphery.

This type of insert mounting seat 4 is designed by fitting a shaft portion with 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) into the hole portion 4b, and then rotating the shaft portion so that the long axis of the shaft portion overlaps with the short axis of the hole portion 4b. This causes the portion of the outer periphery of the cutter body 1 between the circumferentially adjacent chip pockets 2 that is on the cutter rotation direction T side (upper jaw portion) between the first and second slits 4a, 4c of the insert mounting seat 4 to elastically deform so as to tilt toward the cutter rotation direction T, and the gap with the portion of the insert mounting seat 4 that is on the opposite side to the cutter rotation direction T (lower jaw portion) is expanded.

With the insert mounting seat 4 thus expanded, the cutting insert 3 is inserted into the insert mounting seat 4 from the outer periphery of the cutter body 1 with the cutting edge 3a facing the outer periphery, and then the tool is rotated so that the long axis of the tool shaft overlaps with the long axis of the hole 4b. This causes the cutter rotation direction T side of the insert mounting seat 4 to return to its original state, and the cutting insert 3 is sandwiched between the part of the insert mounting seat 4 opposite the cutter rotation direction T due to its elastic force, and is removably fixed and attached to the insert mounting seat 4.

The inner circumference of such a cutter body 1 has multiple (four in this embodiment) circular mounting holes 1a of the same diameter penetrating the cutter body 1 in the direction of the axis O, and are formed at equal intervals in the circumferential direction at positions spaced equal distances from the axis O toward the outer periphery. Furthermore, on the inner circumference side of these mounting holes 1a, a through hole 1b is formed that is larger in diameter than the mounting hole 1a and is centered on the axis O, and a key groove 1c is formed on the outer periphery of this through hole 1b, which communicates with the through hole 1b. In this example of a slotting cutter with coolant holes, two key grooves 1c extend in a direction perpendicular to the axis O between two mounting holes 1a that are adjacent in the circumferential direction when viewed from the direction of the axis O.

Furthermore, in the cutter body 1, in this example of a slotting cutter with coolant holes, the same number of coolant holes 5 as the chip pockets 2 are formed so as to extend radially from the inner periphery of the cutter body 1 to the outer periphery as shown in Figures 3 and 4 when viewed from the axial line O direction. These coolant holes 5 have a circular cross section, and on the outer periphery of the cutter body 1, they open to extend in a direction toward the cutting edge 3a of the cutting insert 3 on the bottom surface of the chip pocket 2 facing the outer periphery of the cutter body 1 between the first and second slits 4a, 4c on the cutter rotation direction T side of the insert mounting seat 4.

Furthermore, a coolant groove 6 that communicates with these coolant holes 5 is formed on one of the two side surfaces 1A and 1B of the cutter body 1, the side surface 1A. As shown in FIG. 3, this coolant groove 6 includes a first coolant groove portion 6A that extends in the circumferential direction of the cutter body 1 with both ends spaced apart from the mounting hole 1a and communicates with the coolant hole 5, and a second coolant groove portion 6B that is spaced apart from the mounting hole 1a and is formed so as to be recessed around the mounting hole 1a toward the inner periphery of the cutter body 1 when viewed from the direction facing the one side surface 1A in the axis O direction, and connects the both ends of the first coolant groove portion 6A.

Therefore, by connecting both ends of the first coolant groove portion 6A with the second coolant groove portion 6B in this example of a slotting cutter with a coolant hole, the coolant groove 6 is formed so as to be continuous around the entire inner circumference of the cutter body 1 around the axis O without opening into the mounting hole 1a, through hole 1b, or key groove 1c.

Here, the first coolant groove portion 6A is formed in an arc shape centered on the axis O, and is divided into four parts around the mounting hole 1a. The radius from the axis O to the wall surface 6a of the first coolant groove portion 6A facing the inner circumference of the cutter body 1 is set to be equal to or less than the radius of a circle circumscribing the mounting hole 1a with the axis O as its center, and in particular, 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 this example of a slotting cutter with coolant holes, is set to be approximately equal to the radius from the axis O to the center line C of the mounting hole 1a.

Furthermore, the second coolant groove portion 6B has an arc-shaped portion that is 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 axial O direction. In particular, in this example of a slotting cutter with coolant holes, the second coolant groove portion 6B is entirely formed as such an arc-shaped portion. The first and second coolant groove portions 6A, 6B have approximately the same groove width and depth, and are formed with a square cross section that is recessed from the one side surface 1A.

The mounting member of this embodiment to which such a slotting cutter with coolant holes is attached comprises a cylindrical mounting member body 11 as shown in Figures 5 to 8, and a disk-shaped flange member 12 as shown in Figures 9 to 12, which is attached to the tip side of this mounting member body 11 (the lower side in Figures 5 and 6).

The mounting member body 11 and flange member 12 are made of a metal material such as steel, like the cutter body 1, and have approximately the same outer diameter (diameter) centered on the axis O. The outer diameter (diameter) of the mounting member body 11 and flange member 12 is slightly larger than the diameter of the circle circumscribing the mounting hole 1a of the cutter body 1 centered on the axis O.

The inner periphery of the mounting member body 11 is a coolant supply hole 11A, and this coolant supply hole 11A is formed with the largest inner diameter at the rear end, which is a fitting hole 11a that fits into the cylindrical protrusion formed at the tip of the arbor described above. In addition, at the tip side of this fitting hole 11a, an insertion hole 11b with the smallest inner diameter is formed, through which the screw shaft portion 13a of the clamp bolt 13 is inserted, as shown in Figures 21 to 23.

Furthermore, a receiving hole 11c is formed further toward the tip side of the insertion hole 11b, opening into the tip surface of the mounting member body 11 and receiving the head 13b of the clamp bolt 13. The inner diameter of the receiving hole 11c is larger than the insertion hole 11b and smaller than the fitting hole 11a. The inner diameters of the fitting hole 11a, the insertion hole 11b, and the receiving hole 11c are all set to a constant size.

As shown in Figures 22 to 24, the tip surface of the head 13b of the clamp bolt 13 is formed with an engagement hole 13c with a regular hexagonal cross section that engages with a work tool such as a hexagonal wrench, and a circulation hole 13d with a circular cross section and a smaller diameter than the circle inscribed in the engagement hole 13c is formed from the bottom surface facing the tip side of the engagement hole 13c to the rear end surface of the screw shaft 13a. In addition, the rear end surface of the mounting member main body 11 is formed with a key groove 11B that extends in the diameter direction relative to the axis O and communicates with the engagement hole 11a, and that engages with a key formed in the tip of the arbor.

With the cutter body 1 and flange member 12 removed, the mounting member body 11 is attached to the tip of the arbor by fitting the cylindrical protrusion at the tip of the arbor into the fitting hole 11a of the coolant supply hole 11A and fitting the key into the key groove 11B, and screwing the screw shaft 13a of the clamp bolt 13 inserted from the accommodation hole 11c into the insertion hole 11b into the clamp screw hole formed in the center of the protrusion. By further screwing the clamp bolt 13, the head 13b of the clamp bolt 13 presses against the bottom surface facing the tip of the accommodation hole 11c, and the mounting member body 11 is fixed to the tip of the arbor.

The tip surface of the mounting member body 11 has an annular wall portion 11d formed on the outer periphery of the opening of the accommodation hole 11c of the coolant supply hole 11A, which protrudes from the tip surface and fits into the through hole 1b of the cutter body 1. Further outside the outer periphery of the annular wall portion 11d, an annular groove portion 11e recessed from the tip surface of the mounting member body 11 is formed adjacent to the annular wall portion 11d.

The height of the annular wall 11d protruding from the tip surface of the mounting member body 11 is set to be smaller than the thickness of the inner periphery of the cutter body 1 in the direction of the axis O. In addition, on the outer periphery of the annular groove 11e, the same number (four) of mounting screw holes 11f as the mounting holes 1a of the cutter body 1 are formed at equal intervals in the circumferential direction so that they are coaxially connected to the center line C of the mounting holes 1a with their axes O aligned.

The outer periphery of the tip surface of the mounting member 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 plane perpendicular to the axis O. A key that fits into a key groove 1c that communicates with the through hole 1b of the cutter body 1 may be formed on the outer periphery of the annular groove portion 11e on the tip surface of the mounting member body 11, but since the cutter body 1 is prevented from rotating by the mounting screw 14 described later, such a key is not formed in this embodiment.

Furthermore, the flange member 12 also has the same number (four) of mounting screw insertion holes 12a as the mounting holes 1a of the cutter body 1, which are formed at equal intervals in the circumferential direction so as to be coaxial with the center line C of the mounting holes 1a. The rear end surface of this flange member 12 has a recess 12b, the inner periphery of which is connected to the through hole 1b of the cutter body 1 and the outer periphery of which is connected to the coolant groove 6, which is recessed from the rear end surface of the flange member 12 so as to avoid the mounting screw insertion holes 12a. 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 tip surface of the flange member 12 are formed in a plane perpendicular to the axis O.

Here, the wall surface 12c of the recess 12b facing the inner periphery of the flange member 12 when viewed from a direction facing the rear end face of the flange member 12 in the axial O direction is formed in this embodiment with the same dimensions and shape as the wall surfaces 6a, 6b of the first and second coolant groove portions 6A, 6B of the coolant groove 6 facing the inner periphery of the cutter body 1 when viewed from a direction facing the one side surface 1A in the axial O direction, as shown in FIG. 12.

With the cutter body 1 facing the one side surface 1A toward the tip, the flange member 12 and the cutter body 1 are arranged such that the annular wall portion 11d of the mounting member body 11 fixed to the tip of the arbor as described above is fitted into the through hole 1b, the other side surface 1B of the cutter body 1 is abutted against the tip surface of the mounting member body 11, and the mounting hole 1a is coaxial with the mounting screw hole 11f, and the flange member 12 is arranged on the inner periphery 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, with the cutter body 1 and flange member 12 thus positioned at the tip of the mounting member body 11, the mounting screw 14 is screwed into the mounting screw hole 11f through the mounting screw insertion hole 12a and the mounting hole 1a as shown in Figures 17 and 20, so that the cutter body 1 is fixed and attached so that it is sandwiched between the flange member 12 and the tip of the mounting member body 11.

With the cutter body 1 and flange member 12 attached to the tip of the mounting member body 11 attached to the tip of the arbor as described above, when the cutter body 1 is rotated around the axis O and the cutting blade 3a performs grooving, parting, or cutting of the workpiece, 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 cutting oil.

The coolant thus supplied to the clamp screw hole passes through the flow hole 13d and engagement hole 13c of the clamp bolt 13 and is supplied to the accommodation hole 11c of the coolant supply hole 11A of the mounting member body 11. Furthermore, the coolant supplied to the accommodation hole 11c of the coolant supply hole 11A passes through the through hole 1b of the cutter body 1 and flows into the recess 12b of the flange member 12, then flows to the outer periphery of the recess 12b and is supplied to the coolant groove 6 toward the rear end side in the direction of the axis O, and is supplied from the coolant groove 6 to the coolant hole 5 and is sprayed from the outer periphery of the cutter body 1.

The mounting member for the slotting cutter with coolant hole configured as described above includes a mounting member body 11 having a coolant supply hole 11A formed on its inner periphery that communicates with the through hole 1b of the cutter body 1, and a flange member 12 that is attached by sandwiching the cutter body 1 with the one side surface 1A facing the tip side between the mounting member body 11 and the tip surface of the mounting member body 11. The rear end surface of the flange member 12 has a recess 12b recessed from the rear end surface, the inner periphery of which communicates with the through hole 1b and the outer periphery of which communicates with the coolant hole 5 via the coolant groove 6.

Therefore, with the mounting member configured as described above, if any part of the recess 12b of the flange member 12 opens into the coolant groove 6 that communicates with the coolant hole 5, coolant can be supplied from the coolant groove 6 of the cutter body 1 to the coolant hole 5. Therefore, high machining precision or connection precision is not required for circumferential alignment of the cutter body 1 with the mounting member body 11 or flange member 12 of the mounting member.

Furthermore, since the mounting member body 11 of the mounting member only needs to be cylindrical as described above, it does not take much time, effort, or cost to form the coolant supply hole 11A, as would be the case if the coolant supply hole 11A were formed at an angle. Moreover, by temporarily holding the coolant in the recess 12b of the flange member 12, it is possible to prevent bias in the ejection pressure of the coolant ejected from the coolant hole 5 through the coolant groove 6 of the cutter body 1, and to achieve uniformity, which makes it possible to reliably remove chips generated by the cutting edge 3a, and to efficiently cool and lubricate the cutting edge 3a.

In addition, in the mounting member of this embodiment, the wall surface 12c of the recess 12b facing the inner periphery of the flange member 12 when viewed from the direction facing the rear end face in the axial O direction is formed to have the same shape and dimensions as the wall surfaces 6a, 6b of the first and second coolant groove portions 6A, 6B of the coolant groove 6 facing the inner periphery of the cutter body 1 when viewed from the direction facing one side surface 1A in the axial O direction. Therefore, even when the coolant flows from this recess 12b into the coolant groove 6, it is possible to prevent the occurrence of an imbalance in the coolant pressure, and it is possible to efficiently supply coolant to the coolant groove 6 and the coolant hole 5.

However, in this embodiment, the wall surface 12c of the recess 12b facing the inner periphery of the flange member 12 when viewed from the direction opposite the rear end face in the axial O direction is formed to have a shape and dimensions that are congruent with the wall surfaces 6a, 6b of the first and second coolant groove portions 6A, 6B of the coolant groove 6 facing the inner periphery of the cutter body 1 when viewed from the direction opposite one side surface 1A in the axial O direction, but may be a similar shape that is larger than the wall surfaces 6a, 6b of the coolant groove 6 facing the inner periphery of the cutter body 1 when viewed from the direction opposite one side surface 1A in the axial O direction.

In addition, in this embodiment, a circular wall portion 11d that protrudes from the tip surface of the mounting member body 11 and fits into the through hole 1b of the cutter body 1 is formed on the outer periphery of the opening of the accommodation hole 11c of the coolant supply hole 11A. This makes it possible to reliably position the cutter body 1 in the radial direction relative to the axis O, allowing for highly accurate groove cutting.

Moreover, in this embodiment, adjacent to the outer periphery of the annular wall portion 11d formed on the tip surface of the mounting member body 11, an annular groove portion 11e is formed on the tip surface of the mounting member body 11, which is recessed from the tip surface. This makes it possible to prevent the corner portion where the tip surface of the mounting member body 11 and the outer periphery of the annular wall portion 11d intersect from interfering with the other side surface 1B of the cutter body 1 that abuts against the tip surface of the mounting member body 11, making it possible to stably attach the cutter body 1 to the mounting member body 11.

On the other hand, in the above example of a slotting cutter with a coolant hole, the coolant groove 6 formed in the cutter body 1 includes a first coolant groove portion 6A that extends circumferentially around the cutter body 1 with both ends spaced apart from the mounting hole 1a and communicates with the coolant hole 5, and a second coolant groove portion 6B that connects both ends of the first coolant groove portion 6A and is also spaced apart from the mounting hole 1a, and is formed so as to be continuous around the entire inner circumference of the cutter body 1 as described above.

Therefore, even if the first coolant groove portion 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 pressure of the coolant supplied from the coolant groove 6 to the coolant hole 5 can be prevented from becoming uneven.

Therefore, according to the example slotting cutter with coolant hole configured as described above, in addition to the coolant being temporarily held in the recess 12b of the flange member 12 of the mounting member, sufficient coolant can be ejected from the coolant hole 5 with a uniform ejection pressure, which makes it possible to more reliably remove chips generated by the cutting edge 3a and to more efficiently cool and lubricate the cutting edge 3a.

Furthermore, in the above example of the slotting cutter with coolant holes, the second coolant groove portion 6B is formed so as to be recessed around the mounting hole 1a toward the inner circumference of the cutter body 1 when viewed from the direction facing one side surface 1A of the cutter body 1 in the axial O direction. This makes it possible to prevent the coolant groove 6 from protruding beyond the circle circumscribing the mounting hole 1a with the axis O of the cutter body 1 as its center, thereby preventing the outer diameter of the mounting member body 11 tip of the mounting member to which the cutter body 1 is attached and the flange member 12 from becoming large, and making it possible to ensure a sufficient cutting depth for the cutting blade 3a provided at the outer circumferential end of the cutter body 1.

In addition, in the above-mentioned example of the slotting cutter with coolant holes, the second coolant groove portion 6B is provided with an arc-shaped portion that is formed in an arc shape centered on the center line C of the mounting hole 1a when viewed from the direction facing one side surface 1A in the axial O direction. Therefore, the distance from the mounting hole 1a can be kept constant in this arc-shaped portion, so it is possible to maintain the strength of the cutter body 1. In particular, in the above-mentioned example of the slotting cutter with coolant holes, the entire second coolant groove portion 6B is an arc-shaped portion centered on the center line C of the mounting hole 1a, so the distance from the mounting hole 1a can be kept constant throughout the entire second coolant groove portion 6B, so the strength can be maintained.

Furthermore, in the above example of a slotting cutter with a coolant hole, the first coolant groove portion 6A of the coolant groove 6 is formed in an arc shape centered on the axis O, and the radius from the axis O to the wall surface 6a of the first coolant groove portion 6A facing the inner circumference of the cutter body 1 is less than the radius of a circle circumscribing the mounting hole 1a with the axis O as its center.

As a result, the circumferential length of the first coolant groove portion 6A can be increased without compromising the cutting depth of the cutting edge 3a, and a more stable supply of coolant to the coolant hole 5 can be achieved. To ensure this effect, it is desirable for the first coolant groove portion 6A to extend between a circle circumscribing and inscribing the mounting hole 1a with the axis O as its center.

Furthermore, in the above example of the slotting cutter with coolant holes, the entire second coolant groove portion 6B is made into the above-mentioned arc-shaped portion as described above, and the radius from the axis O to the wall surface 6a of the first coolant groove portion 6A facing the inner circumference of the cutter body 1 is less than the radius from the axis O to the center line C of the mounting hole 1a, and in particular is approximately equal to the radius to this center line C.

As a result, while the circumferential length of the first coolant groove portion 6A is ensured, the first and second coolant groove portions 6A, 6B do not intersect at an acute angle at the connection portion between the first and second coolant groove portions 6A, 6B, making it possible to prevent imbalances in the coolant pressure at such acute angle connections.

In addition to being an arc-shaped portion centered on the center line C, the second coolant groove portion 6B may be U-shaped when viewed from the direction facing the one side surface 1A, or the connection portion connected to the first coolant groove portion 6A may be formed into a convex curved shape such as a convex arc that is convex toward the mounting hole 1a.

The above example of a slotting cutter with coolant holes is a replaceable-tip type slotting cutter with coolant holes in which a cutting insert 3 with a cutting edge 3a is detachably attached to an insert mounting seat 4 formed on the outer periphery of the cutter body 1. However, the present invention can also be applied to a brazed type slotting cutter with coolant holes in which such a cutting insert 3 is joined to the outer periphery of the cutter body by brazing or the like, or to a mounting member for mounting a solid type slotting cutter with coolant holes in which a cutting edge is formed directly on the outer periphery of the cutter body 1.

The mounting member for the slotting cutter with coolant holes of the above embodiment can also be attached to the slotting cutters with coolant holes described in Patent Documents 1 and 2 with the side of the cutter body with the inlet opening facing the tip side (flange member 12 side) as long as the position of the inlet opening communicates with the recess 12b of the flange member 12. In this case, the cutter rotation direction can be set opposite to the cutter rotation direction T of the above embodiment.

That is, like the above example of a slotting cutter with a coolant hole, the second coolant groove portion 6B connecting both ends of the first coolant groove portion 6A may not be formed, and the first coolant groove portion 6A may be connected to the recess 12b of the flange member 12, or the coolant groove 6 itself, including the first coolant groove portion 6A, may not be formed, and the coolant hole 5 may open to one side surface 1A of the cutter body 1 at the inner periphery of the cutter body 1 and communicate with the recess 12b.

Conversely, the cutter body 1 of the above example of a slotting cutter with coolant holes can also be attached to the mounting member described in, for example, Patent Documents 1 and 2 with one side surface 1A facing the mounting member, as long as the position of the first coolant groove portion 6A coincides with the coolant supply hole. In this case, too, the cutter rotation direction can be set opposite to the cutter rotation direction T of the above example of a slotting cutter with coolant holes in the above embodiment.

Furthermore, in the above embodiment, the mounting member for the slotting cutter with coolant holes of the present invention is described as being applied to a shell-type mounting member in which the mounting member body 11 is attached to an arbor attached to the spindle of a machine tool by a clamp bolt 13. However, even if the mounting member has a cylindrical mounting member body like this shell-type mounting member, the present invention can also be applied to a shank-type mounting member in which the mounting member body is directly attached to the spindle of a machine tool without going through an arbor, as is the case with a small-diameter slotting cutter with coolant holes.

1 Cutter body 1A One side surface of cutter body 1 1B The other 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 edge 4 Insert mounting seat 5 Coolant hole 6 Coolant groove 6A First coolant groove portion 6B Second coolant groove portion 6a Wall surface of first coolant groove portion 6A facing the inner periphery side of cutter body 1 6b Wall surface of second coolant groove portion 6B facing the inner periphery side of cutter body 1 11 Mounting member body 11A Coolant supply hole 11a Fitting hole 11b Insertion hole 11c Storage hole 11d Annular wall portion 11e Annular groove portion 11f Mounting screw hole 12 Flange member 12a Mounting screw insertion hole 12b Recess 12c Wall surface of recess 12b facing the inner periphery of flange member 12 13 Clamp bolt 13a Screw shaft portion of clamp bolt 13 13b Head portion of clamp bolt 13 13c Engagement hole portion 13d Flow hole 14 Mounting screw O Axis line of cutter body 1 T Cutter rotation direction C Center line of mounting hole 1a

Claims (4)

a mounting member for a slotting cutter with a coolant hole, the slotting cutter being attached with the one side facing the tip, the slotting cutter having a coolant hole, the one side facing the tip, the slotting cutter being provided with a chip pocket formed on the outer periphery of a disk-shaped cutter body centered on the axis which is rotated in the cutter rotation direction around the axis, a cutting blade having a cutting blade length in the axial direction greater than the thickness in the axial direction of the outer periphery of the cutter body, the cutting blade being provided on the outer periphery end of a wall surface of the chip pocket facing the cutter rotation direction, the cutter body being provided with a coolant hole extending from the inner periphery of one of the two side surfaces of the cutter body to open radially outward within the cutter body, and a through hole formed on the one side surface on the inner periphery side of the opening of the coolant hole;
a mounting member main body formed in a cylindrical shape centered on the axis line, the mounting member main body having a coolant supply hole formed in an inner periphery thereof, the coolant supply hole communicating with the through hole in a state where the coolant supply hole is coaxial with the axis line;
a flange member formed in a disk shape centered on the axis line, and configured to sandwich the cutter body between the end surface of the mounting member body and the flange member coaxially with the axis line,
A recess is formed on a rear end surface of the flange member facing the mounting member body, the inner periphery of the recess being recessed from the rear end surface and communicating with the through hole and the outer periphery of the recess being recessed from the rear end surface and communicating with an opening of the coolant hole in the inner periphery of the cutter body,
The opening of the coolant hole in the inner periphery of the cutter body is a coolant groove formed in a groove shape recessed from the one side surface,
A mounting member for a slotting cutter with a coolant hole, wherein the wall surface of the recess facing the inner periphery of the flange member when viewed from a direction opposite the rear end face in the axial direction is congruent with the wall surface of the coolant groove facing the inner periphery of the cutter body when viewed from a direction opposite the one side face in the axial direction, or is a similar shape but larger than the wall surface of the coolant groove facing the inner periphery of the cutter body when viewed from a direction opposite the one side face in the axial direction . 2. A mounting member for a slotting cutter with a coolant hole as described in claim 1, characterized in that a circular wall portion protruding from the tip surface of the mounting member body and fitted into the through hole of the cutter body is formed on the outer periphery of the opening of the coolant supply hole. 3. A mounting member for a slotting cutter with a coolant hole as described in claim 2, characterized in that a circular groove portion recessed from the tip surface of the mounting member body is formed adjacent to the outer periphery of the circular wall portion. a mounting member for a slotting cutter with a coolant hole, the slotting cutter being attached with the one side facing the tip, the slotting cutter having a coolant hole, the one side facing the tip, the slotting cutter being provided with a chip pocket formed on the outer periphery of a disk-shaped cutter body centered on the axis which is rotated in the cutter rotation direction about the axis, a cutting blade having a cutting blade length in the axial direction greater than the thickness in the axial direction of the outer periphery of the cutter body, the cutting blade being provided on the outer periphery end of a wall surface of the chip pocket facing the cutter rotation direction, the cutter body being provided with a coolant hole extending from the inner periphery of one of the two side surfaces of the cutter body to open radially outward within the cutter body, and a through hole formed on the one side surface on the inner periphery side of the opening of the coolant hole;
a mounting member main body formed in a cylindrical shape centered on the axis line, the mounting member main body having a coolant supply hole formed in an inner periphery thereof, the coolant supply hole communicating with the through hole in a state where the coolant supply hole is coaxial with the axis line;
a flange member formed in a disk shape centered on the axis line, and configured to sandwich the cutter body between the end surface of the mounting member body and the flange member coaxially with the axis line,
A recess is formed on a rear end surface of the flange member facing the mounting member body, the inner periphery of the recess being recessed from the rear end surface and communicating with the through hole and an outer periphery of the recess being recessed from the rear end surface and communicating with an opening of the coolant hole in the inner periphery of the cutter body,
a circular wall portion protruding from a tip end surface of the mounting member body and fitted into the through hole of the cutter body is formed on an outer periphery of an opening of the coolant supply hole,
A mounting member for a slotting cutter with a coolant hole , wherein a circular groove portion recessed from the tip surface of the mounting member body is formed adjacent to the outer periphery of the circular wall portion .

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