JP7236523B1 - boring head - Google Patents

Abstract

An object of the present invention is to prevent warping of a boring head caused by injecting high-pressure coolant. A boring head (31) includes a head body (32) having a head passage (34) through which coolant flows, and a cartridge shaft (36). The head passage 34 includes an axial passage 34s extending from the distal end of the head main body 32 and overlapping the axis O, and a plurality of axial passages 34s branched from the tip of the axial passage 34s and arranged to avoid the cartridge shaft 36 and the axis O. A first outlet passage 34v is provided in the notch 33b and directed toward the cutting edge tip, and a second outlet passage 34w is on the opposite side of the notch 33b across the axis O. provided in [Selection drawing] Fig. 7

Description

The present invention relates to a modular boring system and a boring head that serves as a tip member of a boring bar.

A boring bar that performs cutting can be elongated in the central axis direction of the boring bar by adding a relay member, such as in a modular boring system, to enable deep boring. Regarding boring bars, there is known a structure in which a coolant passage extending from the end to the tip of the boring bar is bored inside the boring bar and coolant is supplied to the cutting edge tip at the tip of the boring bar via the coolant passage. Such a coolant supply structure is described, for example, in Japanese Patent Laying-Open No. 2021-030384 (Patent Document 1). According to such a structure, coolant can be jetted to the cutting portion to efficiently cool it, which contributes to high-speed machining.

JP 2021-030384 A

The inventor of the present invention has found that the above-described conventional coolant supply structure has points to be improved. In other words, when high-pressure coolant is jetted from the tip of the boring bar toward the cutting edge tip, the tip of the boring bar, including the cutting edge tip, warps to the opposite side of the workpiece due to the reaction force at the time of jetting. Then, the tip of the cutting edge moves away from the cutting portion, and there arises a concern that the diameter of the boring hole becomes small. In particular, when the boring bar is lengthened in the axial direction by adding a relay member as in a modular boring system, the accuracy of cutting is affected.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a boring bar technique that does not affect machining accuracy even when a coolant is vigorously injected.

For this purpose, the boring head according to the present invention comprises: a head passage extending from the head end to the head tip through which coolant flows; and a horizontal hole extending from the notch on one side to the notch on the other side and intersecting with the axis of the boring bar; A cartridge shaft which is arranged away from the axis and has a cutting tip attached to one end thereof, and an adjustment mechanism which is provided at the other end of the cartridge shaft and adjusts the distance from the axis of the boring bar to one end of the cartridge shaft. and a fixing mechanism which is provided at the distal end portion and detachably fixes the cartridge shaft whose distance is adjusted as described above to the distal end portion. The head passage of the head main body includes an axial passage that extends from the end of the head and overlaps with the axis of the boring bar, and an axial passage that branches off from the tip of the axial passage to avoid the horizontal hole at the tip of the head and the axis of the boring bar. A plurality of outlet passages are arranged, a first outlet passage in a notch on one side of the head tip and directed toward the cutting tip, and a second and subsequent outlet passages in the other side of the head tip. provided on the side.

There is no particular limitation on the number of exit passages, as long as at least three are sufficient. The second outlet passage is provided on the other side of the head distal end portion in the circumferential direction relative to the other end of the horizontal hole, and the third outlet passage is provided on the other side of the head distal portion other than the horizontal hole. It is provided on the other side in the circumferential direction than the end.

In the present invention, each of the second and subsequent outlet passages has a smaller cross-sectional area than the first outlet passage. The cross-sectional area of each outlet passage may be equal in at least two or may be different from each other.

According to the present invention, when coolant is injected from a plurality of outlet passages, the reaction force associated with the injection is balanced around the axis of the boring bar, and warping of the boring bar during injection can be prevented. . Therefore, high-speed and high-precision drilling can be achieved while supplying a large amount of coolant to the cutting location. In addition, according to the present invention, since the coolant is injected in three or more directions as viewed from the axis of the boring bar, the injection balance around the axis of the boring bar is further improved. Further, according to the present invention, since the cross-sectional area of the second and subsequent outlet passages is smaller than the cross-sectional area of the first outlet passage, the ejection speed of the second and subsequent outlet passages is higher than the ejection speed of the first outlet passage. also increases, and the injection reaction force of the second and subsequent outlet passages can be increased. Further, according to the present invention, it is possible to sufficiently ensure the injection flow rate of the first outlet passage. The above-mentioned distal end and tip should be understood to refer to the root and tip of the axis of the boring bar. The above-mentioned one side and the other side of the tip part refer to a semicircular area of 0° to 180° and a semicircular area of 180° to 360° centered on the central axis of the head body, that is, the axis of the boring bar. be understood. As a preferred aspect of the invention, with respect to the axial position of the boring bar, the first outlet passage is located axially distally of the second and subsequent outlet passages.

As described above, according to the present invention, it is possible to prevent the boring head from warping even when the coolant is jetted from the tip of the boring head to the cutting portion at high speed. Therefore, the concern that the hole diameter of the boring will be reduced is eliminated, and the machining accuracy is not lowered. The present invention is advantageous for deep hole drilling.

1 is a side view of an embodiment of the present invention; FIG. It is an expanded sectional view which shows the connection location of the same embodiment. It is a side view which extracts and shows the channel|path connection member of the same embodiment. It is a bottom view which extracts and shows the channel|path connection member of the same embodiment. It is an expanded sectional view which shows the modification of the same embodiment. FIG. 4 is a vertical cross-sectional view showing another embodiment of the present invention; It is a front view which shows the front-end|tip part of a boring head.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail based on the drawings. FIG. 1 is an overall view showing a modular boring system according to an embodiment of the present invention, approximately half of which represents a side view and approximately half of which represents a longitudinal section. The modular boring system 10 includes a tool shank 11, a relay adapter 21, and a boring head 31, and extends with the axis O as its central axis. In the following description, one side in the direction of the axis O on the shank side is called the terminal end, and the other side in the direction of the axis O on the head side is called the tip.

The tool shank 11 has a shank portion 12 formed at the distal end of the tool shank 11 and a tip connection portion 13 formed at the tip of the tool shank 11 . The shank portion 12 has a predetermined standard size and shape including a flange portion and a gradually tapered shaft portion protruding from the flange portion toward the end, and is detachably attached to the spindle of a machine tool (not shown). . The tip connection portion 13 is cylindrical and has a flat annular flat surface 14 , a recess 15 formed in the center of the annular flat surface 14 , and a cylindrical portion 16 . is detachably attached. A first side lock bolt hole 17 which is a female screw penetrating through the cylindrical portion 16 extending in the radial direction of the cylindrical portion 16 is formed at a predetermined position in the circumferential direction of the cylindrical portion 16 that defines the recess 15 . The first side lock bolt hole 17 connects with the recess 15 . A first side lock bolt 18 is screwed into the first side lock bolt hole 17 .

Inside the tool shank 11 is provided a shank passage 19 extending from the shank portion 12 at the distal end to the tip connecting portion 13 at the distal end. The shank passage 19 of this embodiment extends so as to overlap the axis O, which is the central axis of the modular boring system 10 . The terminal end of the shank passage 19 is connected to the bottom surface of a large-diameter central terminal hole 12 h formed in the shank portion 12 . The tip of the shank passage 19 is connected to the bottom surface of the recess 15 of the tip connecting portion 13 via the intermediate passage 20 . The inner diameter of the shank passage 19 is made uniform from the end to the tip (that is, uniform in cross section). Also, the inner diameter of the shank passage 19 is smaller than the inner diameters of the terminal center hole 12 h and the intermediate passage 20 .

The shank passage 19 and intermediate passage 20 are arranged coaxially. However, the inner diameter of the intermediate passage 20 is larger than the inner diameter of the shank passage 19 and smaller than the inner diameter of the recess 15 . As a modified example (not shown), the central region of the tool shank 11 excluding the shank portion 12 and the tip connection portion 13 may be elongated. In such a modification, the dimension Lc of the intermediate passage 20 in the direction of the axis O is made longer than the dimension of the shank portion 12 in the direction of the axis O and the dimension of the tip connection portion 13 in the direction of the axis O. As shown in FIG. This allows the modular boring system 10 to drill long deep holes in a workpiece (not shown).

The relay adapter 21 is interposed between the boring head 31 at the tip and the tool shank 11 at the tip to connect them. For this reason, the relay adapter 21 has a terminal connection portion 23 corresponding to the tip connection portion 13 described above, and a tip connection portion 13 identical to the tip connection portion 13 described above, at both ends. Although not shown, a plurality of relay adapters 21 may be interposed, or the relay adapter 21 may be an elongated member having a long dimension in the direction of the axis O from the distal connection portion 23 to the distal connection portion 13. good. This allows the modular boring system 10 to drill longer, deeper holes in a workpiece (not shown). Alternatively, although not shown, in the modular boring system 10, the boring head 31 and the distal tool shank 11 may be directly connected without the intermediate adapter 21 interposed.

The distal end fitting 23 is detachably coupled to the distal end fitting 13 of the tool shank 11 . The terminal connection portion 23 has an annular flat surface 23t and a convex portion 25 projecting from the center of the annular flat surface 23t. The convex portion 25 has a columnar shape, and a first fixing hole 25h is formed at a predetermined position in the circumferential direction. The projection 25 is inserted into and fitted into the recess 15 of the tip connection portion 13, and in a state where the annular flat surface 23t is in surface contact with the annular flat surface 14, the first fixing hole 25h is engaged with the first side lock of the tip connection portion 13. It communicates with the bolt hole 17 . The first side-lock bolt 18 screwed into the first side-lock bolt hole 17 has a tool fitting portion 18t such as a hexagonal hole on the outer diameter side (the side farther from the central axis O). When the side lock bolt 18 is screwed in, the tip of the first side lock bolt 18 on the inner diameter side (the side closer to the central axis O) enters the first fixing hole 25h. Since the tip of the first side lock bolt 18 is tapered and the first fixing hole 25h is formed as a tapered hole, the outer diameter surface of the tip of the first side lock bolt 18 is equal to the inner diameter of the first fixing hole 25h. The faces are pressed by the face-to-face faces of the tapers, the projection 25 is pulled into the recess 15 by the action of the wedge, and the annular flat surface 23t is strongly pressed against the annular flat surface 14.例文帳に追加As a result, the distal connection portion 23 is firmly connected and fixed to the distal connection portion 13 .

Conversely, when the first side lock bolt 18 is loosened, the tip portion of the first side lock bolt 18 retreats from the first fixing hole 25h, and the terminal connection portion 23 is separated from the tip connection portion 13 . The first fixing hole 25h of the present embodiment extends in the radial direction of the projection 25, is a bottomed hole with a flat bottom surface, and is not connected to the relay passage 24, which will be described later.

In this embodiment, a plurality of first side-lock bolt holes 17 are provided at intervals in the circumferential direction in one tip connection portion 13 . Each of the first side lock bolt holes 17 is arranged at two locations with an interval of 90° in the circumferential direction around the axis O, for example. The same applies to the first fixing hole 25h. The terminal connecting portion 23 is more firmly connected and fixed to the distal connecting portion 13 by the plurality of first side lock bolts 18 .

The relay adapter 21 is further provided with a relay passage 24 . The relay passage 24 is a round hole extending in the direction of the axis O and has a constant inner diameter along the direction of the axis O. As shown in FIG. The relay passage 24 of the present embodiment overlaps with the axis O and extends through the convex portion 25 . The tip of relay passage 24 is connected to the bottom surface of recess 15 .

The boring head 31 has a head body 32 , a cartridge shaft 36 , an adjusting mechanism 37 and a cutting tip 39 . The head body 32 is a cylindrical body extending about the axis O and has an outer peripheral surface. A terminal connection portion 23 is provided at the distal end of the head body 32 . The end connection portion 23 of the boring head 31 is the same as the end connection portion 23 of the relay adapter 21 described above, so the same reference numerals are given and the description thereof is omitted.

In FIG. 1, the distal end connection portion 23 of the boring head 31 is connected and fixed to the distal end connection portion 13 of the relay adapter 21, but as a modification not shown, it may be connected and fixed to the distal end connection portion 13 of the tool shank 11. . In other words, the end connecting portion 23 is provided at the end of the boring head 31 and the end of the relay adapter 21 . Further, the tip connecting portion 13 is provided at the tip of the relay adapter 21 and the tip of the tool shank 11 . The number of relay adapters is appropriately adjusted within a range of 0 to a plurality. Regarding the terminal connection part 23 and the tip connection part 13 that are connected to each other, the terminal side member and the tip side member (the tool shank 11, the relay adapter 21, and the boring head 31) on which these connection parts are respectively provided are simply referred to as the tool. They are also referred to as a shank-side member and a head-side member.

Returning to the description of the boring head 31, notches 33b and 33c and a horizontal hole 35 are provided at the tip of the head body 32. As shown in FIG. The cutouts 33b and 33c are formed on one side and the other side of the head body 32 so as to sandwich the axis O, and are recessed from the outer peripheral surface of the head body 32 .

The horizontal hole 35 extends from the notch 33b on one side to the notch 33c on the other side and intersects the axis O. As shown in FIG. The cartridge shaft 36 is passed through the horizontal hole 35 and held so as to be displaceable in a posture that intersects the axis O. As shown in FIG. Specifically, the central portion of the cartridge shaft 36 intersects the axis O, and both ends of the cartridge shaft 36 are spaced apart from the axis O. As shown in FIG.

A cutting tip 39 is attached to one end of the cartridge shaft 36 by screwing. By loosening the screw, the cutting edge tip 39 can be appropriately replaced. The cutting edge tip 39 protrudes radially outward from the outer peripheral surface of the head body 32 . Rotation of the modular boring system 10 about the axis O causes the cutting edge tip 39 to cut a workpiece (not shown) to drill a deep hole.

An adjustment mechanism 37 is provided in the notch 33c on the other side of the tip portion of the head body 32 . The adjustment mechanism 37 includes an adjustment dial 38 coaxially provided at the other end of the cartridge shaft 36 and displaces the cartridge shaft 36 in the direction perpendicular to the axis O. As shown in FIG. By rotating the adjustment dial 38 of the adjustment mechanism 37 by an arbitrary dial scale, the cartridge shaft 36 advances and retreats along the extending direction of the horizontal hole 35 by a displacement amount corresponding to the dial scale.

When the adjustment dial 38 is rotated in one direction, the cutting edge tip 39 is displaced to the outer diameter side away from the axis O, and the hole diameter of the deep hole can be increased. Conversely, when the adjustment dial 38 is rotated in the other direction, the cutting edge tip 39 is displaced toward the inner diameter side so as to approach the axis O, and the hole diameter of the deep hole can be reduced.

A female threaded hole extending from the outer peripheral surface to the horizontal hole 35 is formed at the tip of the boring head 31, and a side lock bolt 40 is screwed into the female threaded hole. These female screw holes and side lock bolts 40 are mechanisms for fixing the cartridge shaft 36 . The side lock bolt 40 is screwed from the outer peripheral surface, and the tip portion abuts against the cartridge shaft 36 to fix the cartridge shaft 36 . Loosening the side lock bolt 40 allows the cartridge shaft 36 to move in the extending direction of the horizontal hole 35 .

The boring head 31 is further provided with a head passage 34 . The head passage 34 includes an axial passage 34s on the distal end side, intermediate passages 34t, 34u, and 34x branching from the distal end side of the axial passage 34s, and a plurality of outlet passages connected to the distal ends of the intermediate passages 34t, 34u, and 34x. 34v, 34w, 34y. The cross-sectional area of the head passage 34 is the smallest among the outlet passages 34v, 34w, 34y, the cross-sectional area of the intermediate passages 34t, 34u, 34x is larger than the cross-sectional area of the outlet passages 34v, 34w, 34y, and the axial passage 34s. is larger than the cross-sectional area of each intermediate passage 34t, 34u, 34x. That is, the cross-sectional area of the head passage 34 decreases as the coolant advances to the tip of the boring bar. All of the head passages 34 are round holes.

The shank passage 19, the relay passage 24, and the head passage 34 are connected in series in this order and extend in the direction of the axis O to form a coolant passage. Coolant is supplied from the main shaft to the end center hole 12h as indicated by the arrows on the left side of FIG. Since the number of relay adapters 21 can be appropriately adjusted within a range of 0 to a plurality, the distal side passage and the distal side passage (shank passage 19 and relay The passageway 24 and the head passageway 34) are also referred to simply as the shank side passageway and the head side passageway.

From the shank passage 19 to the axial passage 34s of the present embodiment, the passage overlaps with the axis O and extends straight, and the cross-sectional area decreases toward the tip. The smaller the cross-sectional area, the faster the flow velocity, and the coolant can be vigorously jetted from the outlet passage 34v toward the cutting location.

The head passage 34 will now be described in detail.

The axis passage 34 s is a round hole that extends overlapping the axis O and penetrates the projection 25 . The axial passage 34s is connected to an intermediate passage 34t extending across the axis O. As shown in FIG. FIG. 7 is a front view of the boring head 31 viewed from the tip side. The midway passage 34t extends orthogonally to the axis O and connects to the tip of the axis passage 34s in a T shape. The outer diameter end of the intermediate passage 34t is sealed with a plug 34b. Both ends of the midway passage 34t are connected to ends of the midway passages 34u and 34x extending parallel to the axis O in an L shape.

In FIG. 1, in order to avoid complication of the drawing, one intermediate passage 34u is represented by a broken line, and the other intermediate passage 34x extending parallel to the intermediate passage 34u is omitted. A horizontal hole 35 extends between the intermediate passages 34u and 34x. The horizontal hole 35 is separated from the intermediate passages 34u and 34x and is not connected.

As shown in FIG. 1, the tip of the intermediate passage 34u is connected to the first outlet passage 34v at a position overlapping the horizontal hole 35 in the direction of the axis O. As shown in FIG. The first outlet passage 34v extends straight at an acute angle with respect to the middle passage 34u extending from the end of the head body 32 in the direction of the axis O to the tip. The outlet of the first outlet passage 34v is arranged on one side of the head body 32 and specifically connects with the notch 33b. And the first outlet passage 34v is directed to one end of the cartridge shaft 36 and the cutting edge tip 39. As shown in FIG.

Further, the tip of the intermediate passage 34u is connected to the inlet of the second outlet passage 34w on the terminal side of the connection point with the inlet of the first outlet passage 34v. The second outlet passage 34w extends straight at an acute angle with respect to the middle passage 34u extending from the distal end side of the head body 32 to the distal end side. The second outlet passage 34w is arranged on the other side of the head main body 32, and specifically connects to the outer peripheral surface on the one side in the circumferential direction from the notch 33c. The second outlet passage 34w is directed to the side opposite to the cutting edge tip 39. As shown in FIG. The ends of the intermediate passages 34u and 34x are sealed with plugs 34c and 34d.

The tip of the intermediate passage 34x illustrated in FIG. 1 is connected to the third outlet passage 34y at a position overlapping the horizontal hole 35 in the direction of the axis O (FIG. 7). The third outlet passage 34y illustrated in FIG. 1 extends straight at an acute angle with respect to the middle passage 34x extending from the distal end to the distal end of the head body 32 in the direction of the axis O. As shown in FIG. The third outlet passage 34y is arranged on the other side of the head main body 32, and specifically connects to the outer peripheral surface on the other side in the circumferential direction of the notch 33c. The third outlet passage 34y is oriented to the side opposite to the cutting edge tip 39. As shown in FIG. All of the first to third outlet passages 34v, 34w, 34y extend straight from the inner diameter side to the outer diameter side with the axis O as the center. Further, the first to third outlet passages 34v, 34w, 34y all extend straight in an oblique direction so as to recede from the axis O from the distal end side to the distal end side.

As shown in FIG. 7, with respect to side portions on one side and the other side of the head body 32 sandwiching the axis O, the first outlet passage 34v is disposed on one side of the head body 32 and directed to the cutting edge tip 39, and the second outlet passage 34v The outlet passage 34 w is located on the other side of the head body 32 and faces away from the cutting tip 39 . The cross-sectional area of the second outlet passage 34w is smaller than the cross-sectional area of the first outlet passage 34v. The third outlet passage 34y is similar to the second outlet passage 34w.

As shown in FIG. 7, the first to third outlet passages 34v, 34w, 34y are arranged around the axis O at intervals of 90° to 150° in the circumferential direction in a well-balanced manner. According to this embodiment, even if the coolant is injected at high speed from the first to third outlet passages 34v, 34w, 34y,
It is balanced and does not warp the boring head 31 and the modular boring system 10 . A well-balanced arrangement of the first to third outlet passages 34v, 34w, and 34y is beneficial for the modular boring system 10 that is long in the direction of the axis O, and does not cause a decrease in machining accuracy when drilling deep holes using the cutting edge tip 39.

Further, according to the present embodiment, since the cross-sectional area of the second outlet passage 34w is smaller than the cross-sectional area of the first outlet passage 34v, the ejection speed of the second outlet passage 34w is higher than the ejection speed of the first outlet passage 34v. Also, the reaction force in the injection direction of the second outlet passage 34w can be increased. Therefore, it is possible to prevent warping of the modular boring system 10 while supplying a sufficient amount of coolant to the cutting location from the first outlet passage 34v.

Further, according to the present embodiment, the position of the third outlet passage 34y not shown in FIG. 1 in the direction of the axis O overlaps the position of the second outlet passage 34w in the direction of the axis O shown in FIG. That is, with respect to the position in the direction of the axis O, the first outlet passage 34v is arranged on the tip side in the direction of the axis O relative to the second and subsequent outlet passages 34w and 34y.

FIG. 2 is an enlarged vertical cross-sectional view showing a connecting portion between the terminal connection portion 23 and the tip connection portion 13. As shown in FIG. Specifically, FIG. 2 shows the connection point between the relay adapter 21 and the boring head 31, but the connection point between the tool shank 11 and the relay adapter 21 is the same, or the connection point between the tool shank 11 and the boring head 31 is also the same. or the connecting points between the relay adapters 21, 21 are the same, and the description of the latter three is omitted. A passage connecting member 41 that connects the relay passage 24, which serves as the shank-side passage, and the head passage 34, which serves as the head-side passage, is interposed at such a connecting portion.

FIG. 3 is a side view showing the passage connecting member 41, showing a state seen in a direction perpendicular to the axis O. As shown in FIG. FIG. 4 is a bottom view showing the passage connecting member 41, showing a state seen from the end side in the direction of the axis O. As shown in FIG. The passage connecting member 41 has a top-like shape, and includes a distal large-diameter portion 42 , a distal small-diameter portion 43 projecting from the distal large-diameter portion 42 toward the distal end, and a passage from the distal large-diameter portion 42 to the distal small-diameter portion 43 . It has a through passage 44 passing through the connecting member 41 and is arranged in the recess 15 . In this embodiment, the entire passage connecting member 41 is completely accommodated within the recess 15 .

The terminal large-diameter portion 42 has a cylindrical shape that occupies the terminal portion of the passage connecting member 41 . The outer peripheral surface of the terminal large-diameter portion 42 fits into the inner peripheral surface of the recess 15 . Furthermore, an end seal portion 46 is provided in an annular gap between the outer peripheral surface of the large diameter end portion 42 and the inner peripheral surface of the recess 15 . Such an annular gap is sealed by end seals 46 . The end seal portion 46 is, for example, an O-ring, and is fitted in an annular groove 48 formed on the outer peripheral surface of the end large diameter portion 42 and extending in the circumferential direction.

The tip small-diameter portion 43 has a cylindrical shape with a smaller diameter than the distal end large-diameter portion 42 and occupies the tip portion of the passage connecting member 41 . The outer peripheral surface of the tip small diameter portion 43 is fitted to the inner peripheral surface of the end of the relay passage 24 . Further, a tip seal portion 47 is provided in an annular gap between the outer peripheral surface of the tip small diameter portion 43 and the inner peripheral surface of the passage connecting member 41 . This annular gap is sealed by the tip seal portion 47 . The tip seal portion 47 is, for example, an O-ring, and is fitted into an annular groove formed in the inner peripheral surface of the relay passage 24 and extending in the circumferential direction.

In this embodiment, the passage connecting member 41 is fixed to the distal end connecting portion 13 . This structure will be explained. A second side lock bolt hole 52 is formed in the outer peripheral surface of the tip connection portion 13 . The second side lock bolt hole 52 extends radially about the axis O and connects with the recess 15 . A second side lock bolt 51 is screwed into the second side lock bolt hole 52 . The second side lock bolt 51 has a tool fitting portion such as a hexagonal hole on the outer diameter side, and when it is screwed from the outer diameter side, the tip of the inner diameter side of the second side lock bolt 51 enters the recess 15 . Then, it abuts on the passage connecting member 41 and fixes it. In this embodiment, the tip of the second side lock bolt 51 is tapered. A tapered second fixing hole 45 is formed on the outer peripheral surface of the large-diameter end portion 42 of the passage connecting member 41 . The second fixing hole 45 has a bottom and is not connected to the through passage 44 . The passage connecting member 41 is firmly fixed to the tip connecting portion 13 by the tip portion of the second side lock bolt 51 entering the second fixing hole.

When the second side lock bolt 51 is screwed into the second side lock bolt hole 52, the male thread of the second side lock bolt 51 is coated with an adhesive. This adhesive hardens and the second side lock bolt 51 is prevented from loosening. Also, the gap between the male thread and the female thread is sealed, preventing the coolant in the recess 15 from leaking out from the second side lock bolt hole 52 .

The second side lock bolt holes 52 are arranged at regular intervals in the circumferential direction. As a result, the passage connecting member 41 is restricted from moving in the direction of the axis O over the entire circumference, and does not tilt with respect to the axis O. As shown in FIG. Therefore, when high-pressure coolant flows from the shank passage 19 into the recessed portion 15, the passage connecting member 41 is fixed so as not to incline with respect to the axis O, even if the hydraulic pressure of the coolant acts unevenly on the passage connecting member 41. be done.

According to this embodiment, the passage connecting member 41 that connects the shank passage 19 on the distal end side and the intermediate passage 24 on the distal end side is accommodated in the recess 15 and is not inserted into the shank passage 19 . Since various types of tool shanks 11 and relay adapters 21 share the shape and dimensions of the concave portion 15, one type of passage connecting member 41 is used to commonly connect various shank passages 19 and head passages 34. can. That is, even when connecting a plurality of types of tool shanks 11 and relay adapters 21, there is no need to prepare a plurality of types of passage connecting members 41. FIG. The same applies to the case of connecting the relay passage 24 and the head passage 34, or the case of connecting other distal side passages and distal side passages.

Further, since the passage connecting member 41 is not inserted into the shank passage 19 on the distal end side, it is not necessary to polish the inner peripheral surface of the shank passage 19 . In other words, since it is sufficient to add finish polishing to a portion not too far from the tip of the shank-side member, that is, the inner peripheral surface of the recess 15, it is also applicable to a long shank-side member.

Furthermore, since the first fixing hole 25h is bottomed and does not connect with the relay passage 24 or the head passage 34, the relay passage 24 or the head passage 34 does not have a sharp angle. Therefore, although not shown, for example, when a tip seal portion is attached to the outer periphery of the tip small diameter portion 43 of the passage connecting member 41 and the tip small diameter portion 43 is inserted into the relay passage 24 or the head passage 34 and fitted, the tip Seals are not damaged. According to the modular boring system of this embodiment, high pressure coolant can be supplied from the tool shank 11 at the end to the tip of the boring head 31 .

Next, a modified example of the embodiment described above will be described. FIG. 5 is a longitudinal sectional view showing a modification. In this modified example, the same reference numerals are given to the configurations common to the above-described embodiment, and the description thereof will be omitted, and the different configurations will be described below. In this modification, a terminal seal portion 49 is provided in place of the terminal seal portion 46 (FIG. 2) described above. The end seal portion 49 is obtained by moving the end seal portion 46 to the end side of the second fixing hole 45 , and has the same configuration as the end seal portion 46 in other respects.

Since the end seal portion 49 of the modified example blocks the space between the recess 15 and the second side lock bolt hole 52 , the coolant flowing from the shank passage 19 to the recess 15 does not enter the second side lock bolt hole 52 . . Therefore, when the second side lock bolt 51 is simply screwed into the second side lock bolt hole 52 without using the adhesive described above, or when the second side lock bolt 51 is not screwed into the second side lock bolt hole 52 Even so, coolant is prevented from leaking out from the second side lock bolt hole 52 . In the modified modular boring system, too, high pressure coolant can be supplied from the distal tool shank 11 to the tip of the boring head 31 .

Another embodiment of the present invention will now be described. FIG. 6 is an enlarged sectional view showing another embodiment of the invention. For other embodiments, the same reference numerals are given to the configurations common to the above-described embodiment, and the description thereof is omitted, and the different configurations are described below. In another embodiment, a seal portion 53 is provided in the annular gap between the second side lock bolt 51 and the second side lock bolt hole 52 . This annular gap is sealed by the seal portion 53 . The seal portion 53 is an O-ring, for example, and is fitted in an annular groove formed in the outer peripheral surface of the second side lock bolt 51 and extending in the circumferential direction. Also, the seal portion 53 is installed closer to the recessed portion 15 than the male thread of the second side lock bolt 51 .

According to the embodiment shown in FIG. 6, the sealing portion 53 seals the annular gap between the second side lock bolt 51 and the second side lock bolt hole 52 without sealing the annular gap with an adhesive or the like. . Therefore, coolant is prevented from leaking from the second side lock bolt hole 52 .

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same scope as the present invention or within an equivalent scope. For example, a part of configuration may be extracted from one embodiment described above, another part of configuration may be extracted from another embodiment described above, and these extracted configurations may be combined.

INDUSTRIAL APPLICABILITY The present invention is advantageously used in machine tools.

10 modular boring system, 11 tool shank,
13 tip connection part, 15 concave part, 16 cylindrical part,
19 shank passage, 20 intermediate passage, 21 relay adapter,
23 end connection part, 24 relay passage, 25 convex part,
31 boring head 32 head main body 34 head passageway
34s axis line passage, 34 head passage, 34b, 34c plugs,
34t, 34u, 34x intermediate passage, 34v first exit passage,
34w second outlet passage, 34y third outlet passage, 35 horizontal hole,
36 cartridge shaft, 37 adjustment mechanism, 38 adjustment dial,
39 cutting edge tip, 40 side lock bolt (fixing mechanism),
O boring bar axis;

Claims (2)

A head passage extending from the terminal end to the tip through which coolant flows, notches formed on one side and the other side of the tip across the axis of the boring bar, and cuts on the other side from the notch on the one side. a head body having a transverse hole extending to the notch and intersecting the axis of the boring bar;
a cartridge shaft that is passed through the horizontal hole, has one end and the other end arranged away from the axis, and has a cutting tip attached to the one end;
an adjustment mechanism provided at the other end of the cartridge shaft for adjusting a distance from the axis to the one end of the cartridge shaft;
a fixing mechanism provided at the distal end portion for detachably fixing the cartridge shaft having the adjusted distance to the distal end portion;
The head passage includes an axial passage extending from the distal end portion of the head main body and overlapping with the axial line, and at least three axial passages branching from the distal end of the axial passage and arranged avoiding the lateral hole and the axial line. including an exit passage for the book,
a first said outlet passage is provided in said one side notch and directed to said cutting tip;
The second outlet passage is provided on the other side of the distal end portion in the circumferential direction from the other end of the horizontal hole,
the third outlet passage is provided on the other side of the distal end portion in the circumferential direction relative to the other end of the horizontal hole,
A boring head, wherein each of said second and subsequent outlet passages has a smaller cross-sectional area than said first outlet passage. 2. The boring head of claim 1, wherein the first outlet passage is located axially distally relative to the axial position of the boring bar relative to the second and subsequent outlet passages.

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