JP2018075676A - Holder for grooving tool, grooving tool, and grooving tool unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holder for a grooving tool in which coolant supply passage changeover operation can be easily performed.SOLUTION: A holder for a grooving tool which is used in such a manner that the holder is attached to a tool block in a state that a cutting insert is held, and feeds coolant supplied from the tool block, comprises: a tabular body part having a pair of rectangular principal surfaces, a side part positioned between the pair of principal surfaces, and a pair of insert attachment parts which are positioned at corner parts of the side part corresponding to opposing corners of the principal surfaces; and a closing part which is attached to one principal surface side of the body part. The body part is provided with: a pair of open holes being located at positions different from each other in a shorter direction of the principal surface and penetrating in a plate thickness direction; a pair of coolant supply passages individually communicating with the pair of open holes, and individually extending to the vicinity of individual insert attachment parts; and a mounting hole for mounting the closing part. The closing part closes an opening at one principal surface side of the pair of open hole in a state where the closing part is attached to the body part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a grooving tool holder, a grooving tool, and a grooving tool unit.

  Blade-shaped grooving tools (parting blades) used for grooving and parting off are known. Patent Document 1 discloses a grooving tool having a coolant supply path (blade channel) that passes through the inside of the grooving tool, opens near the cutting edge, and supplies coolant to the cutting edge in order to cool the cutting edge. Is described.

  Such a grooving tool has a structure in which cutting inserts are attached diagonally. For this reason, two coolant supply paths are provided corresponding to each cutting edge. Further, since the grooving tool may be attached with the front and back reversed, through holes are provided corresponding to each coolant supply path so that the coolant can be introduced into the coolant supply path from either the front or back surface. One opening of the through hole is closed by a sealing device, and leakage of the coolant is suppressed.

Special table 2015-512794 gazette

  In the grooving tool of Patent Document 1, screw holes are respectively formed adjacent to the two through holes, and the sealing device is screwed to the screw holes. Therefore, when switching the coolant supply path, it is necessary to remove and replace the sealing device, which makes the operator's process complicated.

  The present invention has been made under such a background, and an object of the present invention is to provide a grooving tool holder, a grooving tool, and a grooving tool unit in which a coolant supply path can be easily switched.

In order to solve the above-mentioned problems, a grooving tool holder according to an aspect of the present invention is used by attaching to a tool block while holding the cutting insert, and supplying coolant supplied from the tool block to the cutting blade of the cutting insert. A grooving tool holder, which is located at a pair of rectangular main surfaces, a side portion positioned between the pair of main surfaces, and a corner portion of the side portion corresponding to a diagonal of the main surface And a pair of insert attachment portions to which the cutting insert is attached, and a plate-like main body portion, and a closing portion attached to one main surface side of the main body portion. A pair of through-holes that are arranged at different positions in the short side direction of the main surface and penetrate in the plate thickness direction, and a pair of coolant supplies that respectively communicate with the pair of through-holes and extend to the vicinity of the separate insert mounting portions. When a mounting hole for mounting the closure part, is provided, wherein the blocking portion is to close the opening of the one main surface side of the pair of the through hole while being mounted to the body portion.
Moreover, the grooving tool of one aspect of the present invention includes the above-described grooving tool holder and the cutting insert attached to at least one of the pair of insert attaching portions.

According to the above-described configuration, the closing portion closes both the through holes simultaneously. For this reason, when switching a coolant supply path, it is not necessary to remove a blockage part from a main-body part, and an operator's process can be simplified.
Moreover, since the high-hardness material is generally provided in the main body portion of the grooving tool holder, drilling tends to be costly. In particular, when the mounting hole is a screw hole, the cost is expected to be further increased. The pair of through holes are closed by a closing portion attached to one attachment hole. Therefore, it is not necessary to provide a plurality of mounting holes, and the processing cost of the mounting holes can be suppressed.
According to the above-described configuration, the pair of through holes are arranged to be shifted from each other in the short direction of the main surface. The grooving tool holder may be moved in the longitudinal direction of the main surface with respect to the tool block, but the attachment position along the short direction of the main surface is determined. For this reason, the supply system (packing described later) from the tool block to the grooving tool holder is arranged so as to be biased to one side in the short direction of the main surface, so that either one of the pair of through holes is arranged. Only coolant can be supplied. Moreover, the coolant supply flow path for supplying the coolant can be switched by rotating the position of the grooving tool holder with respect to the tool block by 180 °.

  In the grooving tool holder described above, the closing portion has a protrusion extending in the thickness direction of the main body, and the protrusion is inserted into one of the pair of through holes. Also good.

  According to the above-described configuration, rotation of the closing portion with respect to the attachment hole can be suppressed. Therefore, it can suppress that a blockade part shifts from opening of a pair of through-holes, and can block up a pair of through-holes reliably.

  In the grooving tool holder described above, the attachment hole is a screw hole, and the closing portion is positioned between a screw inserted into the screw hole, a head portion of the screw, and the main surface. It is good also as a structure which has a cover body which block | closes opening of the said one main surface side of the said through-hole.

  According to the above-described configuration, the blocking portion can be easily removed. In addition, if the lid is provided with a projection, the screw can be loosened and the lid can be rotated, so that the through hole into which the projection is inserted can be inserted into either of the pair of through holes without removing the screw. Can be switched.

  A grooving tool unit according to an embodiment of the present invention is a grooving tool unit including the above-described grooving tool, and includes the grooving tool and the tool block that supports the grooving tool. The tool block surrounds a rectangular facing surface facing the main surface of the grooving tool, a coolant channel opening to the facing surface, an opening of the coolant channel and a short side of the facing surface. One of the pair of through-holes of the grooving tool, having a packing that is biased toward one side in the hand direction and compressed between the opposing surface and the main surface of the main body. Opens in a region surrounded by the packing.

  According to this embodiment, the packing provided in the tool block surrounds one of the openings of the pair of through holes. Therefore, the coolant can be supplied to only one of the pair of through holes. Thereby, since the coolant supply path to be used can be switched simply by changing the grooving tool to the tool block, it is not necessary to remove the lid and the number of work steps can be reduced.

  According to the present invention, it is possible to provide a grooving tool holder, a grooving tool, and a grooving tool unit that allow easy switching of the coolant supply path.

The perspective view of the grooving tool unit which concerns on 1st Embodiment. The disassembled perspective view of the grooving tool of 1st Embodiment. The front view of the grooving tool of 1st Embodiment. Sectional drawing which follows the IV-IV line of FIG. The partial front view of the grooving tool of 2nd Embodiment. Sectional drawing which follows the VI-VI line of FIG. The front view of the obstruction | occlusion part of the modification 1 of 2nd Embodiment. The front view of the obstruction | occlusion part of the modification 2 of 2nd Embodiment.

  Embodiments to which the present invention is applied will be described below in detail with reference to the drawings. In the drawings used in the following description, for the purpose of emphasizing the feature portion, the feature portion may be shown in an enlarged manner for convenience, and the dimensional ratios of the respective constituent elements are not always the same as in practice. Absent. In addition, for the same purpose, portions that are not characteristic may be omitted from illustration.

<First Embodiment>
<Grooving tool unit>
FIG. 1 is a perspective view of a grooving tool unit 50 according to the first embodiment.
As shown in FIG. 1, the grooving tool unit 50 includes a grooving tool 1 and a tool block 51 that supports the grooving tool 1. The grooving tool unit 50 is used for grooving and parting using a lathe.

<Tool block>
The tool block 51 is a block for supporting the grooving tool 1 and supplying coolant to the grooving tool 1. The tool block 51 includes an opposing surface 52, a first step portion 53, a second step portion 54, a pair of coolant passages (first coolant passage 55A and second coolant passage 55B), and packing ( First packing 56A and second packing 56B).

  The facing surface 52 faces one main surface (second main surface 10b) of the grooving tool 1. The facing surface 52 has a rectangular shape. In the following description, the short side direction of the facing surface 52 may be referred to as the up-down direction, and the longitudinal direction of the facing surface 52 may be referred to as the left-right direction. The posture in which the grooving tool unit 50 is used is not limited.

  The first and second coolant channels 55 </ b> A and 55 </ b> B open to the facing surface 52. The openings of the first and second coolant channels 55A and 55B are arranged side by side in the left-right direction. The first and second coolant passages 55 </ b> A and 55 </ b> B extend inside the tool block 51. The coolant is supplied from the external device to one of the first and second coolant channels 55A and 55B.

  The first and second packings 56 </ b> A and 56 </ b> B are attached to the facing surface 52 by being fitted into grooves formed in the facing surface 52. The first packing 56A surrounds the opening of the first coolant channel 55A. The second packing 56B surrounds the opening of the second coolant channel 55B. In the facing surface 52, a region surrounded by the first and second packings 56A and 56B is formed to be recessed by about 0.4 mm. The first and second packings 56 </ b> A and 56 </ b> B are compressed by contacting the opposing surface 52 and the second main surface 10 b of the grooving tool 1. As a result, a sealed channel space (a liquid reservoir portion LP described later) is formed inside the first and second packings 56A and 56B.

The first and second packings 56A and 56B are arranged side by side in the left-right direction. The grooving tool unit 50 is used in a state in which the cutting blade 12 is protruded from either one of the left and right directions selected alternatively. As shown in FIG. 1, in the present embodiment, the first packing 56 </ b> A and the first coolant channel 55 </ b> A constitute a coolant supply path when the cutting blade 12 protrudes to the left in a front view. In addition, the second packing 56B and the second coolant channel 55B constitute a coolant supply path when the cutting blade 12 is protruded to the right in front view.
The first and second packings 56 </ b> A and 56 </ b> B are arranged so as to be biased downward on the facing surface 52. As will be described later, in the region surrounded by the first or second packing 56A, 56B, only one of the first and second through holes 6, 7 of the grooving tool 1 opens. . As a result, the coolant is supplied to one of the first and second through holes 6 and 7.

The first step portion 53 and the second step portion 54 are positioned above and below the opposing surface 52 (both sides in the short direction). The first step portion 53 and the second step portion 54 protrude in the normal direction of the facing surface 52.
The first step portion 53 is located above the facing surface 52. The first step portion 53 has three gripping pieces 53a that move downward (that is, the second step portion 54 side) as the screw 53b rotates. A gripping surface 53f is provided below the gripping piece 53a.
The second step portion 54 is located below the facing surface 52. The second step portion 54 has a gripping surface 54f facing upward. The gripping surface 54f is inclined in a direction toward the upper side as the distance from the facing surface 52 increases.

  The grooving tool 1 is sandwiched and gripped between the gripping surface 53f of the first step portion 53 and the gripping surface 54f of the second step portion 54 from the vertical direction. In addition, since the gripping surface 54f of the second step portion 54 is inclined, the grooving tool 1 is sandwiched from above and below and pressed against the facing surface 52 side to compress the first and second packings 56A and 56B.

<Grooving tools and holders for grooving tools>
FIG. 2 is an exploded perspective view of the grooving tool 1 of the present embodiment. FIG. 3 is a front view of the grooving tool 1 of the present embodiment.
The grooving tool 1 includes a grooving tool holder 2 and a cutting insert 11. The grooving tool holder 2 holds the cutting insert 11. The grooving tool holder 2 is used by being attached to a tool block 51. The grooving tool holder 2 supplies the coolant supplied from the tool block 51 to the cutting blade 12 of the cutting insert 11. The grooving tool holder 2 has a rectangular plate-shaped main body 10 and a closing portion 20.

(Main body)
The main body 10 includes rectangular first and second main surfaces 10a and 10b, and side portions 10c and 10d located between the first and second main surfaces 10a and 10b.
The first main surface 10a is a surface to which the closing portion 20 is attached. The second main surface 10 b is a surface facing the facing surface 52 of the tool block 51.
The side portions 10c and 10d connect the first and second main surfaces 10a and 10b. The side portions 10c and 10d are classified into a pair of short side portions 10c and a pair of long side portions 10d. The short side portion 10c extends along the short sides of the first and second main surfaces 10a and 10b. 10 d of long side parts are extended along the long side of 1st and 2nd main surface 10a, 10b.

  The main body 10 is formed in a rectangular thin plate shape from steel or the like. The main body 10 rotates 180 ° around a center line (axis of the mounting hole 9 in FIG. 2) extending in the plate thickness direction of the main body 10 through the rectangular center formed by the first and second main surfaces 10a and 10b. It has a symmetrical shape. The main body portion 10 is formed at the corner portions 13 of the side portions 10c and 10d corresponding to the diagonals of the first and second main surfaces 10a and 10b (that is, the boundary portion between the short side portion 10c and the long side portion 10d). It has a pair of insert attachment part (1st insert attachment part 16A and 2nd insert attachment part 16B) located. The cutting insert 11 is attached to at least one of the first and second insert attachment portions 16A and 16B.

  As shown in FIG. 2, the first and second insert mounting portions 16A and 16B are provided with a notch portion 16c extending inward from the corner portion 13 and a slit 16d extending further inward from the notch portion 16c. Yes. Further, the first and second insert mounting portions 16A and 16B have an upper jaw portion 16a and a lower jaw portion 16b that are arranged vertically with a notch interposed therebetween. The cutting insert 11 is sandwiched between the upper jaw portion 16A and the lower jaw portion 16B and clamped to the main body portion 10. The cutting insert 11 is inserted into the cutout portion 16c with the upper jaw portion 16A elastically deformed upward, and is attached to the first insert attachment portion 16A or the second insert attachment portion 16B.

  The main body 10 includes a first through hole 7, a second through hole 8, a first internal flow path (first coolant supply path) 17, and a second internal flow path (second coolant). Supply path) 18 and mounting holes 9 are provided.

  The attachment hole 9 is provided for attaching the closing portion 20. The attachment hole 9 is located at the center (intersection of diagonal lines) of the rectangular main body 10. The attachment hole 9 penetrates in the plate thickness direction. A female screw is formed on the inner peripheral surface of the mounting hole 9. That is, the attachment hole 9 is a screw hole.

  The first and second through holes 7 and 8 penetrate in the plate thickness direction of the main body 10. The first and second through holes 7 and 8 are circular. The first and second through holes 7 and 8 have the same diameter. The first and second through holes 7 and 8 are arranged so as to be shifted from each other in the short and long directions of the main surfaces 10a and 10b.

The first through hole 7 is disposed on the first insert mounting portion 16A side in the longitudinal direction, and is disposed on the second insert mounting portion 16B side in the short side direction. On the other hand, the 2nd through-hole 8 is arrange | positioned at the 2nd insert attachment part 16B side in the longitudinal direction, and is arrange | positioned at the 1st insert attachment part 16A side in the transversal direction.
The first and second through-holes 7 and 8 are arranged in 180 ° rotational symmetry about the attachment hole 9. Therefore, the distance between the attachment hole 9 and the first through hole 7 is equal to the distance between the attachment hole 9 and the second through hole 8. Moreover, the 1st through-hole 7, the 2nd through-hole 8, and the attachment hole 9 are located in a line. That is, the attachment hole 9 is arranged at the midpoint between the first through hole 7 and the second through hole 8.

  The first internal flow path 17 communicates with the first through hole 7. Similarly, the second internal flow path 18 communicates with the second through hole 8. The first and second internal flow passages 17 and 18 are arranged 180 ° rotationally symmetrically around the attachment hole 9. Hereinafter, the first internal channel 17 will be described as a representative of the first and second internal channels 17 and 18.

The first internal channel 17 (and the second internal channel 18) includes a main channel 17a, a first branch channel 17b, and a second branch channel 17c.
The main flow path 17a communicates with the first through hole 7 on one end side. Moreover, the branch part 17d branched from the 1st and 2nd branch paths 17b and 17c is located in the other end side of the main flow path 17a. The main flow path 17a linearly extends from the first through hole 7 toward the short side portion 10c where the first insert mounting portion 16A is located, and reaches the branch portion 17d.

  The first branch path 17b is bent obliquely downward toward the first insert mounting portion 16A at a point extending linearly from the branch portion 17d obliquely upward. Furthermore, the first branch path 17b extends to the vicinity of the first insert mounting portion 16A and opens on the upper side.

  The second branch passage 17c bends obliquely upward toward the first insert mounting portion 16A at a point extending linearly so as to extend the main flow passage 17a from the branch portion 17d. Further, the second branch path 17c extends to the vicinity of the first insert mounting portion 16A and opens on the lower side.

  When the coolant is passed through the first internal channel 17 via the first through hole 7, the coolant is injected from the openings of the first and second branch channels 17b and 17c. Thereby, a coolant can be supplied to the cutting blade 12 of the cutting insert 11 attached to the first insert attachment portion 16A from above and below.

(Blocking part)
As shown in FIG. 1, the closing portion 20 is attached to the first main surface 10 a side of the main body portion 10. Moreover, the closure part 20 has the screw | thread 21 and the cover body 25 as shown in FIG.
The screw 21 has a shaft portion 21a on which a male screw is formed, and a head portion 21b located on one end side of the shaft portion 21a. The screw 21 is inserted into the mounting hole 9.

  The lid body 25 is formed in a plate shape. The lid body 25 is arranged with the plate surface facing the first main surface 10 a of the main body 10. The lid body 25 has an annular portion 26, and a first covering portion 27 and a second covering portion 28 that extend in the opposite directions from the annular portion 26. One of the first and second covering portions 27 and 28 closes the opening of the first through hole 7 and the other closes the opening of the second through hole 8. That is, the lid body 25 simultaneously closes the openings on the first main surface 10 a side of the first and second through holes 7 and 8 in a state of being attached to the main body portion 10.

  The annular portion 26 is formed in an annular shape, and an insertion hole 26a penetrating in the thickness direction is provided at the center. The shaft portion 21a of the screw 21 is inserted into the insertion hole 26a.

  The first covering portion 27 has a columnar protrusion 27 a on the side facing the first main surface 10 a of the main body portion 10. The protrusion 27a extends in the plate thickness direction of the lid body 25 (that is, the plate thickness direction of the main body 10). The diameter of the protrusion 27 a is substantially the same as or slightly smaller than the diameter of the first and second through holes 7 and 8. The distance between the axis of the insertion hole 26a and the axis of the protrusion 27a is equal to the distance between the axis of the mounting hole 9 and the axes of the first and second through holes 7 and 8. The protrusion 27 a is inserted into one of the first through hole 7 and the second through hole 8 by attaching the closing portion 20 to the main body portion 10.

  The second covering portion 28 has a recess 28 a on the side facing the first main surface 10 a of the main body portion 10. The recess 28a is circular. The diameter of the recess 28 a is larger than the diameters of the first and second through holes 7 and 8. The distance between the axis of the insertion hole 26 a and the axis of the recess 28 a is equal to the distance between the axis of the attachment hole 9 and the axes of the first and second through holes 7 and 8. The concave portion 28 a faces the opening of one of the first and second through holes 7 and 8 by attaching the closing portion 20 to the main body portion 10. By providing the recess 28a, any one of the first and second through holes 7 and 8 can be sealed with an edge of the recess 28a to suppress liquid leakage.

(Function and effect)
Next, the function and effect of the grooving tool 1 (and the grooving tool holder 2) of this embodiment will be described.
4 is a cross-sectional view taken along line IV-IV in FIG. As shown in FIG. 4, the grooving tool 1 is attached to the tool block 51 with the second main surface 10 b facing the facing surface 52. Between the 2nd main surface 10b and the opposing surface 52, the 1st packing 56A (and 2nd packing 56B) is compressed. A region surrounded by the second main surface 10b, the facing surface 52, and the first packing 56A constitutes a liquid reservoir portion LP provided in the coolant flow path.

  The first coolant channel 55A of the tool block 51 opens in a region surrounded by the first packing 56A. Therefore, the coolant supplied from the first coolant channel 55A of the tool block 51 reaches the liquid reservoir LP. Further, the first through hole 7 of the main body 10 opens in a region surrounded by the first packing 56A. Therefore, the coolant flows from the liquid reservoir LP into the first through hole 7.

  The opening on the first main surface 10 a side of the first through hole 7 is closed by the second covering portion 28 of the lid body 25. The second covering portion 28 prevents the coolant that has flowed into the first through hole 7 from flowing out of the opening on the first main surface 10a side. The coolant that has flowed into the first through hole 7 is supplied to the cutting blade 12 via the first internal flow path 17 that communicates with the first through hole 7.

  As shown in FIG. 4, the first covering portion 27 of the lid body 25 closes the opening of the second through hole 8 on the first main surface 10 a side. Further, the protrusion 27 a of the first covering portion 27 is inserted into the second through hole 8. The protrusion 27a suppresses the lid 25 from rotating. That is, the second covering portion 28 can be prevented from being displaced from the opening of the first through hole 7, and the opening of the first through hole 7 can be reliably closed by the second covering portion 28.

As shown in FIG. 1, the first and second packings 56 </ b> A and 56 </ b> B of the tool block 51 are arranged on the opposing surface 52 so as to be biased downward. Moreover, the 1st and 2nd through-holes 7 and 8 of the grooving tool 1 are arrange | positioned by shifting up and down. That is, the 1st and 2nd through-holes 7 and 8 are arrange | positioned in the mutually different position of the transversal direction of main surface 10a, 10b. As a result, only one of the first through hole 7 and the second through hole 8 located on the lower side (the first through hole 7 in the example of FIG. 1) is the first packing 56A (or the second packing). Opening is made in a region surrounded by the packing 56B). The coolant that has reached the region inside the first packing 56 </ b> A from the first coolant channel 55 </ b> A flows only into the first through hole 7. Further, when the grooving tool 1 is rotated by 180 ° and attached to the tool block 51, only the second through hole 8 is surrounded by the first packing 56A (or the second packing 56B). . In this case, the coolant that has reached the inner region of the first packing 56 </ b> A flows only into the second through hole 8.
The first and second packings 56 </ b> A and 56 </ b> B may be arranged so as to be biased upward on the facing surface 52. That is, the first and second packings 56 </ b> A and 56 </ b> B only need to be arranged to be biased to one side in the short direction of the facing surface 52.

Next, a procedure for switching the internal flow path through which the coolant flows when the grooving tool 1 is rotated and replaced with respect to the tool block 51 will be described.
First, the screw 21 of the closing part 20 is sufficiently loosened. Next, the lid body 25 is retracted toward the head 21 b side of the screw 21, and the protruding portion 27 a is removed from the second through hole 8. Next, the lid body 25 is rotated 180 °. Next, the protrusion 27 a is inserted into the first through hole 7 and the screw 21 is tightened to fix the lid 25. On the other hand, the grooving tool 1 is removed from the tool block 51, rotated 180 °, and attached to the tool block 51 again. By passing through the above process, the internal flow path through which the coolant flows can be switched from the first internal flow path 17 to the second internal flow path 18.

  The closing part 20 of the present embodiment can rotate the lid 25 around the axis of the mounting hole 9 by loosening the screw 21. For this reason, it is not necessary to completely remove the blocking portion 20 when the internal flow path for flowing the coolant is switched by rotating the grooving tool 1 relative to the tool block 51. The internal flow path can be switched by loosening the screw 21 and rotating the lid 25.

According to the present embodiment, the first and second through holes 7 and 8 are closed by the closing portion 20 attached to one attachment hole 9. That is, since a plurality of mounting holes 9 are not required, the processing cost of the mounting holes can be suppressed.
According to this embodiment, the attachment hole 9 is located between the first and second through holes 7 and 8. Thereby, the structure which the obstruction | occlusion part 20 attached to the attachment hole 9 block | closes the 1st and 2nd through-holes 7 and 8 simultaneously is realizable easily.

Second Embodiment
FIG. 5 is a partial front view of the grooving tool 101 of the second embodiment. 6 is a cross-sectional view taken along line VI-VI in FIG.
The grooving tool 101 of the second embodiment is different from the grooving tool 101 of the first embodiment in the configuration of the closing portion 120. In addition, about the component of the same aspect as the above-mentioned embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The grooving tool 101 has a closing portion 120 attached to the first main surface 10a side of the main body portion 10. The closing part 120 has a screw 21 and a lid 125.

  The lid 125 is formed in a disc shape. An insertion hole 125 a is provided at the center of the lid 125. The shaft portion 21a of the screw 21 is inserted into the insertion hole 125a. The lid 125 is disposed with the plate surface facing the first main surface 10 a of the main body 10. The diameter of the lid 125 is larger than the distance between the axis of the attachment hole 9 and the axes of the first and second through holes 7 and 8. Therefore, the lid 125 has an opening on the first main surface 10a side of the first and second through holes 7 and 8 regardless of the angle of the lid 125 attached to the axis of the attachment hole 9. Close at the same time. According to the present embodiment, when the grooving tool 101 is rotated and replaced with respect to the tool block 51, it is not necessary to remove the closing portion 120 and it is not necessary to rotate the closing portion 120. That is, the operator can switch the internal flow path through which the coolant flows only by removing the grooving tool 101 from the tool block 51, rotating 180 °, and attaching it to the tool block 51 again.

<Modification>
FIG. 7 is a front view of the closing portion 120A of Modification 1 of the second embodiment. FIG. 8 is a front view of the closing portion 120B of Modification 2 of the second embodiment.
The closing portion 120A of the first modification includes a screw 21 and a plate-like lid 125A. The lid 125A has a triangular shape with rounded corners in plan view.
The closing part 120B of Modification 2 includes a screw 21 and a plate-like lid 125B. The lid 125B has a hexagonal shape in plan view.

  As shown in the first and second modifications, the lids 125, 125A, and 125B simultaneously open the first and second through holes 7 and 8 regardless of the angle of rotation with respect to the axis of the screw 21. As long as what closes out comes out, it may have not only circular shape but any shape.

In plan view, the longest distances from the center of the mounting hole 9 to the opening of the first and second through holes 7 and 8 on the first main surface 10a side are defined as a first distance R1 and a second distance R2, respectively. . In the present specification, the longest distance to the opening means the distance to the farthest part of the circular opening edges of the first and second through holes 7 and 8.
In addition, the distance from the center of the attachment hole 9 to the outer shape of the lids 125, 125A, 125B in plan view is a third distance R3. As shown in FIG. 5, the third distance R <b> 3 of the lid 125 is constant over the entire circumference around the attachment hole 9. On the other hand, as shown in FIGS. 7 and 8, the third distance R3 between the lids 125A and 125B continuously changes along the circumferential direction.
When the third distance R3 is larger than the first and second distances R1 and R2 on the entire circumference around the mounting hole 9, the lids 125, 125A and 125B are at any angle with respect to the axis of the screw 21. Even if it rotates, the openings of the first and second through holes 7 and 8 are simultaneously closed.
When the third distance R3 is smaller than the first and second distances R1 and R2 at a part around the mounting hole 9, the first and second penetrations are performed as shown in the first embodiment. A protrusion 27a to be inserted into one of the holes 7 and 8 is required. In this case, the protrusion 27 a suppresses the rotation of the lid body 25 and suppresses the lid body 25 from being displaced from the openings of the first and second through holes 7 and 8.

  Although various embodiments of the present invention have been described above, each configuration in each embodiment and combinations thereof are examples, and addition, omission, replacement, and configuration of configurations are within the scope without departing from the spirit of the present invention. Other changes are possible. Further, the present invention is not limited by the embodiment.

  In the above-described embodiment, the attachment hole is a screw hole, and the case where the closing portion is fixed by inserting a screw into the screw hole is exemplified, but other configurations may be used. For example, the mounting hole may be a hole in which a female screw is not formed, a screw may be inserted from the second main surface side of the main body portion, and the lid body may be fixed with a nut.

DESCRIPTION OF SYMBOLS 1,101 ... Groove tool 2 ... Groove tool holder 7, 8 ... Through-hole 9 ... Mounting hole 10 ... Main-body part 10a, 10b ... Main surface 10c, 10d ... Side part 11 ... Cutting insert 12 ... Cutting blade 13 ... Corner portion 16A, 16B ... Insert mounting portion 17, 18 ... Internal flow path (coolant supply path)
20, 120, 120A, 120B ... Blocking part 21 ... Screw 21a ... Shaft part 21b ... Head 25, 125, 125A, 125B ... Lid 27a ... Projection part 50 ... Grooving tool unit 51 ... Tool block 52 ... Opposing surface

Claims (5)

A holder for a grooving tool that is attached to a tool block while holding the cutting insert and supplies coolant supplied from the tool block to the cutting blade of the cutting insert,
A pair of rectangular main surfaces, a side portion located between the pair of main surfaces, and a pair of cutting inserts that are attached to the corner portions of the side portions corresponding to the diagonal of the main surfaces A plate-shaped main body having an insert mounting portion;
A closing part attached to one main surface side of the main body part,
In the main body,
A pair of through-holes arranged in different positions in the short direction of the main surface and penetrating in the thickness direction;
A pair of coolant supply passages that respectively communicate with the pair of through holes and extend to the vicinity of the separate insert mounting portions;
A mounting hole for mounting the blocking portion is provided,
The closing portion closes the opening on the one main surface side of the pair of through holes in a state of being attached to the main body portion,
Grooving tool holder. The closing portion has a protrusion extending in the thickness direction of the main body,
The protrusion is inserted into one of the pair of through holes.
The grooving tool holder according to claim 1. The mounting hole is a screw hole,
The closing portion includes a screw inserted into the screw hole, a lid positioned between the head of the screw and the main surface, and closing an opening on the one main surface side of the pair of through holes, Having
The grooving tool holder according to claim 1 or 2. A grooving tool holder according to any one of claims 1 to 3,
The cutting insert attached to at least one of the pair of insert attachment parts,
Grooving tool. A grooving tool unit comprising the grooving tool according to claim 4,
The grooving tool;
The tool block for supporting the grooving tool,
The tool block is
A rectangular facing surface facing the main surface of the grooving tool;
A coolant channel opening in the facing surface;
A packing that surrounds the opening of the coolant channel and is biased to one side in the short direction of the facing surface, and is compressed between the facing surface and the main surface of the main body,
Either one of the pair of through-holes of the grooving tool opens in a region surrounded by the packing,
Grooving tool unit.

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