JP2008296317A - Combination holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combination holder which effectively supply a suitable amount of coolant to both a cutting edge of a drill and a cutting edge of an additional machining tip. <P>SOLUTION: The combination holder 1 to be mounted on a spindle of a machine tool is formed of the drill 5 for boring and the additional machining tip 6 for additional machining such as chamfering in an area of a machined hole 81. In a portion enclosed by a holder main body 2, and an annular side wall portion 31 and a bottom portion 32 of a tip mounting portion 3 a coolant pool 35 is formed. In the drill 5, a coolant hole 52 is formed for leading a coolant C in a coolant supply channel 21 from a rear end 53 of the drill 5 to the cutting edge 51 at a front end of the same. In the bottom portion 32 of the tip mounting portion 3, a coolant channel 321 is formed for leading the coolant C in the coolant pool 35 to the cutting edge 61 of the additional machining tip 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a combination holder (composite holder) equipped with a drill for performing drilling and an additional machining tip for performing additional machining on an opening side portion of a machining hole by the drill. Processing holder).

The spindle of a numerical control (NC) machine tool or the like may be provided with a combination holder that includes a drill and a chamfering tip and performs chamfering and chamfers the opening after drilling. According to this combination holder, chamfering can be performed at the same time as the drilling is completed, and the processing efficiency can be improved.
For example, Patent Document 1 discloses a drill holder including a drill mounting portion on which a drill is mounted and a tip mounting portion on which a chamfered tip is mounted. And the tip mounting part can be repositioned with respect to the axial direction of the drill mounting part. Further, for example, in Patent Document 2, a coolant is supplied into an oil supply type collet chuck (drill holder), and a coolant is supplied to a collet provided between the chuck body and the drill to the cutting edge at the tip of the drill. It is disclosed to provide a plurality of slits and spouts that can be made.

However, in the conventional combination holder (drill holder), the coolant is supplied from the outer periphery of the drill to the drill tip, while the coolant is supplied from the spray nozzle provided on the spindle of the machine tool to the chamfering tip. Blowing. Therefore, it has been difficult to effectively supply an appropriate amount of coolant to both the drill and the chamfered tip.
Furthermore, when a plurality of types of combination holders are exchanged and used, it is difficult to spray an appropriate amount of cooling liquid on each drill and chamfering tip.

JP-A-8-174362 Japanese Patent No. 3321678

  The present invention has been made in view of such conventional problems, and intends to provide a combination holder that can effectively supply an appropriate amount of coolant to both the cutting edge of a drill and the cutting edge of an additional machining tip. Is.

The present invention is configured to be attached to a main spindle of a machine tool and to be rotated by receiving the rotational force of the main spindle, and to form a drill for drilling and a machining hole or workpiece formed in the workpiece by the drill. In a combination holder provided with additional processing tips for performing additional processing such as chamfering, counterbore, inner diameter processing, etc.
The combination holder includes a holder main body portion that holds the rear end portion of the drill, and a tip mounting portion that engages with the outer periphery of the holder main body portion to hold the additional processing chip.
The holder body has a coolant supply path capable of supplying coolant therein.
The tip mounting portion includes an annular side wall portion that engages with an outer periphery of the holder main body portion, a bottom portion that covers the tip of the holder main body portion with the drill inserted, and the bottom portion toward the tip side of the drill. And a protrusion holding part for holding the additional processing chip.
In the part surrounded by the holder main body part, the annular side wall part and the bottom part, a coolant reservoir part capable of storing the coolant flowing out from the coolant supply path is formed,
The protrusion holding portion holds the additional processing tip in a state where the cutting edge of the additional processing tip is disposed in the chip discharge groove in the drill,
In the drill, a coolant hole for guiding the coolant in the coolant supply path from the rear end of the drill to the cutting edge at the tip is formed,
At least one of the annular side wall portion, the bottom portion, and the protrusion holding portion is formed with a coolant channel for allowing the coolant accumulated in the coolant accumulation space to flow to the blade edge of the additional machining tip. (Claim 1).

The combination holder of the present invention has a coolant supply path in the holder main body portion that holds the rear end side portion of the drill, and from this coolant supply path to both the cutting edge of the drill and the cutting edge of the additional machining tip, Efforts are made to supply an appropriate amount of coolant effectively.
Specifically, in the present invention, a coolant hole for guiding the coolant in the coolant supply path from the rear end of the drill to the cutting edge at the tip is formed in the drill held by the holder main body. . Thereby, an appropriate amount of coolant can be effectively supplied to the cutting edge of the drill via the coolant hole.

  Further, a coolant reservoir is formed in a portion surrounded by the holder main body, the annular side wall, and the bottom, and the coolant that has flowed out of the coolant supply path can be stored in the coolant reservoir. And at least any one of the cyclic | annular side wall part in a chip | tip mounting part, a bottom part, and a protrusion holding | maintenance part is formed with the coolant flow path for making the coolant in a coolant reservoir part flow down to the blade edge of an additional process chip | tip. Thereby, an appropriate amount of coolant can be effectively supplied to the cutting edge of the additional machining tip via the coolant flow path.

  Therefore, according to the combination holder of the present invention, an appropriate amount of coolant can be effectively supplied to both the cutting edge of the drill and the cutting edge of the additional machining tip.

A preferred embodiment of the present invention described above will be described.
In the present invention, the combination holder performs chamfering, counterboring, etc. at the same time that drilling is performed on the opening side portion of the processing hole formed in the workpiece (workpiece) by the drill with the additional processing tip. Additional processing can be performed. Further, the combination holder can perform additional processing such as chamfering, counterboring, inner diameter processing, or the like on a formation hole formed in advance on a workpiece (workpiece) by the additional processing tip.

Moreover, when forming the said coolant flow path in the said bottom part, it can form in the inner wall face of the penetration hole which penetrates a drill, and can also form as a through-hole in parts other than this inner wall face. Further, the coolant flowing down in the coolant channel can flow down to the cutting edge of the additional machining tip by flowing down the side surface of the protruding holding portion.
Further, when the coolant channel is formed in the bottom part and the protrusion holding part, the coolant channel can be formed in communication with the bottom part and the protrusion holding part. In this case, for example, the coolant channel may be a groove formed continuously on the inner wall surface of the insertion hole through which the drill is inserted and the side wall surface of the protruding holding portion.

  Further, in the tip mounting portion, a plurality of the protrusion holding portions are formed from the bottom portion, the additional processing chips are held in the plurality of protrusion holding portions, respectively, and the outer periphery of the holder main body portion has the above-mentioned A tapered outer peripheral surface that is reduced in diameter toward the tip side of the drill is formed, and a tapered inner peripheral surface having an inclined shape along the tapered outer peripheral surface is formed on the inner periphery of the annular side wall portion in the tip mounting portion. The tapered inner peripheral surface of the annular side wall portion of the tip mounting portion faces the tapered outer peripheral surface of the holder main body portion, and the tapered surface is formed on the stepped surface formed at the rear end portion of the tapered outer peripheral surface. It is preferable that the tip mounting portion is coaxially mounted on the holder main body portion on which the drill is mounted by bringing the rear end surface of the inner peripheral surface into contact with each other.

In this case, the holder on which the drill is mounted while moving the blade edge of the additional machining tip along the spiral shape of the chip discharge groove in a state where the blade edges of the plurality of additional machining tips are respectively disposed in the chip discharge groove in the drill. It can be mounted while turning the chip mounting portion relative to the main body. Then, the tapered inner peripheral surface of the annular side wall portion of the tip mounting portion is slid with respect to the tapered outer peripheral surface of the holder main body, and the rear end surface of the tapered inner peripheral surface is formed on the stepped surface formed at the rear end portion of the tapered outer peripheral surface. The chip mounting part is pulled into the holder main body part until it comes into contact. Thereby, a chip | tip mounting part can be mounted | worn in parallel with respect to the holder main-body part which mounted | wore the drill, and the parallelism of the blade edge | tip of the some additional processing chip | tip with respect to the axial direction of a drill can be improved.
Moreover, when the said taper outer peripheral surface and a taper inner peripheral surface face, it can prevent that the coolant in a coolant reservoir part leaks outside between these.

Further, on the outer periphery of the annular side wall portion in the tip mounting portion, a male thread portion is formed, and on the outer periphery of the holder main body portion, a drawing ring is mounted via a plurality of steel balls arranged in the circumferential direction, On the inner periphery of the drawing ring, a female screw portion is formed that is screwed into the male screw portion. By rotating the drawing ring, the male screw portion and the female screw portion are screwed together, thereby the holder main body portion. It is preferable that the chip mounting portion is retracted.
In this case, the annular side wall portion of the chip mounting portion is formed on the stepped surface formed at the rear end portion of the tapered outer peripheral surface of the holder main body portion by rotating the drawing ring with respect to the holder main body portion via the plurality of steel balls. The tip mounting portion can be easily pulled into the holder main body until the rear end surface of the taper inner peripheral surface is brought into contact.

Further, the drill includes a plurality of the cutting blades and the chip discharging grooves, and the plurality of additional processing chips are all chamfering chips, and the cutting edges of the plurality of chamfering chips are respectively the chip discharging grooves. It is preferable that the position of the drill in the axial direction and the distance from the center of rotation of the drill coincide with each other in a state of being disposed inside.
In this case, by adopting a structure in which the taper outer peripheral surface of the holder main body portion and the taper inner peripheral surface of the annular side wall portion of the tip mounting portion face each other, the cutting edges of a plurality of additional machining tips in the axial direction of the drill are adopted. The degree of parallelism can be increased. As a result, the positions of the cutting edges of the plurality of chamfering tips in the axial direction of the drill and the distance from the center of rotation of the drill can be easily matched.
When chamfering is performed with a plurality of chamfering tips, the rotation radii of the cutting edges of the plurality of chamfering tips are the same, and chamfering can be performed stably at high speed.

  Further, by making the tapered outer peripheral surface and the tapered inner peripheral surface face each other, the rotation center of the main spindle of the machine tool, the rotation center of the holder main body portion, and the rotation center of the tip mounting portion can be easily matched. . Then, the radial distance from the central axis of the taper inner peripheral surface to the cutting edges of the plurality of chamfered tips at the tip mounting portion, and the radial distance from the central axis of the main spindle (and the tapered outer peripheral surface) of the machine tool to the cutting edges of the plurality of chamfering chips. It can be.

Further, the coolant channel is a channel groove formed in an insertion port formed in the bottom portion of the tip mounting portion so that the drill is inserted, and the channel groove is the additional machining tip in the circumferential direction of the drill. It is preferable to form it corresponding to the arrangement position of (Claim 5).
In this case, the coolant in the coolant reservoir can be more effectively supplied to the cutting edge of the additional machining tip via the flow channel. In addition, a flow-path groove | channel can be formed in the circumferential direction position adjacent to the circumferential direction position of an additional process chip | tip.

Hereinafter, embodiments of the combination holder of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the combination holder 1 of this example is attached to the main shaft 100 of the machine tool 10 and is configured to rotate by receiving the rotational force of the main shaft 100. Further, the combination holder 1 is provided with chamfering, counterboring, inner diameter machining, etc., on the opening side portion of a drill 5 for drilling and a machining hole 81 formed in a workpiece (workpiece) 8 by the drill 5. An additional processing chip 6 for processing is provided. The combination holder 1 has a holder main body 2 that holds the rear end portion of the drill 5, and a tip mounting portion 3 that engages with the outer periphery of the holder main body 2 to hold the additional processing tip 6. .

As shown in FIGS. 1 and 3, the holder main body 2 has a coolant supply path 21 through which coolant C can be supplied. The tip mounting portion 3 includes an annular side wall portion 31 that engages with the outer periphery of the holder main body portion 2, a bottom portion 32 that covers the tip of the holder main body portion 2 in a state where the drill 5 is inserted, and a tip of the drill 5 from the bottom portion 32. And a protrusion holding portion 33 that protrudes toward the side and holds the additional processing chip 6.
A coolant reservoir 35 capable of storing the coolant C flowing out from the coolant supply passage 21 is formed in a portion surrounded by the holder main body 2, the annular side wall 31 and the bottom 32. The protrusion holding portion 33 holds the additional processing tip 6 in a state where the cutting edge 61 of the additional processing tip 6 is disposed in the chip discharge groove 50 of the drill 5.

In the drill 5, a coolant hole 52 for guiding the coolant C in the coolant supply path 21 from the rear end portion 53 of the drill 5 to the cutting edge 51 at the front end is formed. A coolant channel 321 for allowing the coolant C accumulated in the coolant reservoir 35 to flow down to the cutting edge 61 of the additional machining tip 6 is formed at the bottom 32 of the tip mounting portion 3.
1 and 2, the axial direction of the drill 5 is indicated by an arrow L, and the front side is indicated by an arrow L1.

Hereinafter, the combination holder 1 of this example will be described in detail with reference to FIGS.
The combination holder 1 of this example is used for a general-purpose machine tool 10 that operates by performing numerical control (NC) such as a machining center. The spindle 100 of the general-purpose machine tool 10 chucks a plurality of types of combination holders 1. A chuck portion 101 is provided. The combination holder 1 has a chuck taper portion 26 to be held by the chuck portion 101 on the rear side of the holder main body portion 2. Further, a plurality of types of combination holders 1 are prepared, such as those with different outer diameters, lengths, etc. of the drill 5, types of additional processing tips 6, different arrangement positions in the axial direction L, etc. Can be installed.

Further, as shown in FIG. 2, a coolant path 102 through which the coolant C can be supplied into the coolant supply path 21 of the combination holder 1 is formed on the main shaft 100 of the general-purpose machine tool 10. The coolant (lubricated coolant) C is used for lubrication and cooling during processing.
As shown in FIG. 1, the coolant reservoir portion (space) 35 in this example includes the tip of the holder body 2 (in this example, the tip of collet 23 and the collet holding member 25 described later) and the tip mounting portion 3. It is formed between the bottom part 32 and the annular side wall part 31.

  As shown in the figure, the holder main body 2 of this example has a cylindrical shape with a hollow hole 20 along the axial direction L thereof. A collet 23 for holding the outer periphery of the drill 5 on the holder main body 2 is disposed at the front end portion of the hollow hole 20, and a rear end portion 53 of the drill 5 is supported at an intermediate portion of the hollow hole 20. A support member 22 is disposed. The support member 22 is screwed into the hollow hole 20. A V-shaped groove 222 is formed on the end surface of the support member 22, and an end portion 531 having a two-surface width is formed on the rear end portion 53 of the drill 5. Then, when the end face 531 of the two-sided width of the drill is inserted into the V-shaped groove 222 of the support member 22, these are connected in the rotation direction, and when the drill 5 is turned, the support member 22 is also screwed into the hollow hole 20. Advance and retreat.

  Further, the coolant supply path 21 is formed in a rear end side portion of the hollow hole 20. In addition, an annular tapered surface 27 that is reduced in diameter toward the rear end side is formed at the front end side portion of the hollow hole 20, and the outer periphery of the collet 23 has a tapered shape along the annular tapered surface 27. Yes. As shown in FIG. 2, a pull stud 28 that is held by the chuck portion 101 of the main shaft 100 of the general-purpose machine tool 10 is provided on the rear end side portion of the hollow hole 20 of the holder main body portion 2.

As shown in FIG. 1, a through hole 221 that penetrates in the axial direction L is formed at the center of the support member 22, and the coolant C in the coolant supply path 21 passes through the through hole 221 of the support member 22. Then, it flows down into the coolant hole 52 of the drill 5. Further, the coolant C in the coolant supply passage 21 flows down to the collet 23 through a gap between the V-shaped groove 222 of the support member 22 and the end 531 having a two-face width of the drill 5.
The collet 23 is formed with a plurality of slits 231 in the circumferential direction T in the axial direction L for allowing the coolant C flowing down from the coolant supply path 21 to flow down to the coolant reservoir 35. .

  The collet 23 is held at the tip of the holder main body 2 by a collet holding member 25 with a part thereof being inserted into the tip of the hollow hole 20. Further, the collet 23 has a collet center hole 232 through which the drill 5 is inserted. The collet holding member 25 is slidable through an engagement member 251 that engages with the outer peripheral portion of the collet 23, and a plurality of steel balls 252 that are arranged in the circumferential direction T with respect to the engagement member 251 and a holder. It has a tightening ring (nut) 253 that is screwed onto the outer periphery in the vicinity of the tip of the main body 2.

  As shown in FIGS. 4 and 5, when the drill 5 is mounted on the holder body 2, the rear end of the drill 5 is placed in the collet center hole 232 of the collet 23 disposed in the hollow hole 20 of the holder body 2. By inserting the side portion and turning the tightening ring 253 relative to the holder main body 2, the engagement member 251 press-fits the collet 23 into the distal end portion of the hollow hole 20, and the drill 5 is inserted into the holder through the collet 23. The main body 2 can be held.

  As shown in FIGS. 1 and 3, the drill 5 of this example includes two pieces of chip discharge grooves 50, and two cutting blades 51 corresponding to the tip positions of the chip discharge grooves 50. Further, two coolant holes 52 formed in the drill 5 are formed in a portion where the chip discharge groove 50 is not formed in the drill 5. The two coolant holes 52 in this example are formed in a spiral shape along the spiral shape of the two chip discharge grooves 50. In addition, the coolant hole 52 can be made into various through holes other than this, for example, it can also form 1 item | strip | row linearly.

As shown in FIGS. 1 and 3, the additional processing chip 6 of this example is a chamfering chip 6A, and the combination holder 1 is configured to perform chamfering with two chamfering chips 6A. And in the chip | tip mounting part 3, while the two protrusion holding | maintenance parts 33 are formed from the bottom part 32, the chip | tip 6A for chamfering is hold | maintained at the some protrusion holding | maintenance part 33, respectively.
Further, the coolant channel 321 formed in the bottom 32 of the tip mounting portion 3 of this example is a channel groove 321 formed in the insertion port 322 provided in the bottom 32 of the tip mounting portion 3 so that the drill 5 can be inserted. The flow channel 321 is formed in correspondence with the arrangement position of the two additional machining tips 6 with respect to the circumferential direction T of the drill 5. Two channel grooves 321 in this example are formed adjacent to the cutting-side tip of the cutting edge 61 of each additional machining tip 6 (see FIG. 3).

As shown in FIG. 1, a tapered outer peripheral surface 241 that is reduced in diameter toward the distal end side of the drill 5 is formed on the outer periphery of the holder main body portion 2 of this example. A tapered inner peripheral surface 311 having an inclined shape along the tapered outer peripheral surface 241 is formed on the inner periphery of the annular side wall portion 31 in the chip mounting portion 3 of this example. The tip mounting portion 3 is formed at the rear end of the tapered outer peripheral surface 241 while the tapered inner peripheral surface 311 of the annular side wall 31 of the tip mounting portion 3 faces the tapered outer peripheral surface 241 of the holder main body 2. The rear end surface 312 of the tapered inner peripheral surface 311 is brought into contact with the stepped surface 242 thus mounted coaxially with respect to the holder main body 2 to which the drill 5 is mounted.
Further, the cutting edges 61 of the plurality of chamfering tips 6 </ b> A are arranged in the chip discharge groove 50, and the distances from the rotation center of the position drill 5 with respect to the axial direction L of the drill 5 are the same.

  Further, by facing the taper outer peripheral surface 241 in the holder main body 2 and the taper inner peripheral surface 311 in the annular side wall 31, the rotation center in the spindle 100 of the machine tool 10, the rotation center in the holder main body 2, The rotation center in the chip mounting portion 3 can be easily matched. Then, the radial distance from the central axis of the taper inner peripheral surface 311 to the cutting edges 61 of the plurality of chamfering tips 6A in the tip mounting portion 3 is set to a plurality of chamfers from the central axis of the spindle 100 (and the taper outer peripheral surface 241) of the machine tool 10. The radial distance to the cutting edge 61 of the tip 6A can be set.

As shown in the figure, a male screw portion 313 is formed on the outer periphery of the annular side wall portion 31 in the chip mounting portion 3. A pull-in ring (nut) 41 is attached to the outer periphery of the holder main body 2 via a plurality of steel balls 42 arranged in the circumferential direction T. A female thread portion 411 to be screwed is formed.
And the chip | tip mounting part 3 turns to the holder main-body part 2 by the screwing of the external thread part 313 and the internal thread part 411 by rotating the drawing ring 41 with respect to the holder main-body part 2 via the some steel ball 42. FIG. It is configured to be pulled in.

Next, in the combination holder 1 of this example, a procedure for mounting the chip mounting portion 3 to the holder main body portion 2 will be described in detail.
First, the two chamfering tips 6A are respectively attached to the tip portions of the protruding holding portions 33 of the chip mounting portion 3, and the two chamfering tips 6A are previously attached to the protruding holding portions 33 (FIGS. 1 and 3). reference).
Next, as shown in FIGS. 4 and 5, the drill 5 is inserted into the insertion hole 322 in the bottom 32 of the tip mounting portion 3, and the tip mounting portion is moved to the outer periphery of the holder main body 2 to which the drill 5 is mounted. Three annular side wall portions 31 are arranged.

  Next, as shown in FIG. 6, the cutting edges 61 of the additional machining tips 6 are arranged along the spiral shape of the chip discharge grooves 50 in a state where the cutting edges 61 of the plurality of additional machining chips 6 are respectively disposed in the chip discharge grooves 50 of the drill 5. The tip mounting portion 3 is mounted while rotating with respect to the holder main body portion 2 to which the drill 5 is mounted.

As shown in FIGS. 7 and 1, the tip mounting portion 3 is rotated with respect to the tapered outer peripheral surface 241 in the holder main body 2 by rotating the drawing ring 41 with respect to the holder main body 2 via the plurality of steel balls 42. Of the annular side wall portion 31 until the rear end surface 312 of the tapered inner peripheral surface 311 contacts the stepped surface 242 formed at the rear end portion of the tapered outer peripheral surface 241. The chip mounting portion 3 is pulled into the front. At this time, when the drawing ring 41 is turned, the chip mounting portion 3 is pulled into the holder main body 2 by the screw connection between the drawing ring 41 and the chip mounting portion 3.
In this way, the tip mounting portion 3 can be mounted in parallel to the holder main body portion 2 to which the drill 5 is mounted, and the parallelism of the cutting edges 61 of the plurality of additional processing tips 6 with respect to the axial direction L of the drill 5 can be increased. it can.

  As shown in FIG. 1, the combination holder 1 of this example has the coolant supply path 21, and the coolant C in the coolant supply path 21 is supported in the hollow hole 20 of the holder body 2. It can flow down into the two coolant holes 52 formed in the drill 5 via the through hole 221 of the member 22. Further, the coolant C in the coolant supply path 21 is formed between the tip of the holder body 2 and the chip mounting portion 3 via the support member 22 in the hollow hole 20 of the holder body 2, the collet 23, and the like. It is possible to flow down to the coolant reservoir 35. Then, the coolant C accumulated in the coolant reservoir 35 can flow down in the respective coolant channels (channel grooves) 321 and the side surfaces of the protrusion holding portions 33 and down to the cutting edge 61 of each additional machining tip 6. it can.

Thus, in this example, the coolant C stored in the coolant supply passage 21 can be effectively supplied to the two cutting edges 51 of the drill 5 via the two coolant holes 52, and the coolant reservoir 35. And it can be effectively supplied to the cutting edges 61 of the two additional machining tips 6 via the two coolant channels 321.
Further, by appropriately setting the pressure of the coolant C supplied to the coolant supply path 21, the diameter of the coolant hole 52, the cross-sectional area of the coolant path 321, and the like, the cutting edge 51 of the drill 5 and the cutting edge 61 of the additional machining tip 6 are set. The flow rate of the coolant C supplied to can be optimized.
Therefore, according to the combination holder 1 of this example, an appropriate amount of coolant C can be effectively supplied to both the cutting edge 51 of the drill 5 and the cutting edge 61 of the additional machining tip 6.

Further, by adopting a structure in which the taper outer peripheral surface 241 in the holder main body 2 and the taper inner peripheral surface 311 in the annular side wall portion 31 of the chip mounting portion 3 face each other, two additional processing chips in the axial direction L of the drill 5 are provided. The parallelism of the six cutting edges 61 can be increased. Thereby, the position with respect to the axial direction L of the drill 5 of the cutting edge 61 of the two chamfering tips 6 </ b> A and the distance to the rotation center of the drill 5 can be easily matched.
As shown in FIG. 1, when drilling a workpiece (workpiece) 8, a hole is drilled by the drill 5 and simultaneously a drilled hole is drilled by the two chamfering tips 6 </ b> A. Chamfering can be performed efficiently and efficiently on the opening 81.

As shown in FIGS. 8 and 9, the coolant flow path 321 in the bottom portion 32 of the chip mounting portion 3 can be a through hole 321 </ b> A formed through the bottom portion 32. In this case, the gap between the insertion hole 322 formed in the bottom 32 and the drill 3 can be sealed with a sealing ring 323 such as an O-ring disposed in the insertion hole 322.
The through hole 321 </ b> A can also be formed in at least one of the annular side wall portion 31 and the protruding holding portion 33 of the chip mounting portion 3.

Below, the example of the process performed with the drill 5 and the additional process tip 6 in the said combination holder 1 is shown.
As shown in FIG. 10, for example, the two protrusion holding portions 33 in the chip mounting portion 3 of the combination holder 1 are mounted with a chamfering tip 6 </ b> A on one protrusion holding portion 33, and an inner diameter machining is performed on the other protrusion holding portion 33. The chip 6B for use can be mounted. As shown in the figure, when drilling is performed, drilling can be performed with the drill 5 and at the same time, chamfering can be performed on the opening of the processed hole 81 with the chamfering tip 6A. .

  Further, as shown in FIG. 11, the inner diameter machining can be performed by the inner diameter machining tip 6B. As shown in FIG. 12, the cutting edge 51 of the drill 5 chamfers the corner portion 83 of the workpiece 8 (45 °, 30 °). In this case, the inner diameter machining can be performed on a pilot hole (formation hole) 82 formed on the workpiece 8, and the chamfering is performed by moving the spindle 100 of the machine tool 10 and mounting the drill 5 mounted on the combination holder 1. Can be performed along the corner 83 of the workpiece 8.

  Although not shown, the protruding holding portion 33 can hold a counterbore tip. In this case, drilling can be performed on the opening side portion of the processed hole 81 after drilling with the counterbore tip at the same time as drilling is performed.

It is a figure which shows the combination holder in an Example, and is AA arrow directional cross-sectional explanatory drawing in FIG. Explanatory drawing which shows the combination holder in an Example. Cross-sectional explanatory drawing which shows the periphery of the drill and additional processing chip | tip in a combination holder in an Example seen from the axial direction of the drill. Cross-sectional explanatory drawing which shows the state which mounts | wears a holder main-body part with a drill in an Example. Cross-sectional explanatory drawing which shows the state which mounted | wore the holder main-body part in the Example. Cross-sectional explanatory drawing which shows the state which mounts the chip | tip mounting part in a holder main-body part in an Example. Cross-sectional explanatory drawing which shows the state before the chip | tip mounting part in a Example mounts | wears with a holder main-body part, and the chip | tip mounting part by drawing-in ring. It is a figure which shows the other combination holder in an Example, and is BB arrow directional cross-sectional explanatory drawing in FIG. Cross-sectional explanatory drawing which shows the periphery of the drill and additional processing chip | tip in another combination holder in an Example seen from the axial direction of the drill. Cross-sectional explanatory drawing which shows the state which drills by the combination holder which mounted | wore the chip | tip for chamfering, and the chip | tip for internal diameter processing in an Example. Sectional explanatory drawing which shows the state which performs an internal diameter process with the combination holder which mounted | wore the chip | tip for chamfering, and the chip | tip for internal diameter processing in an Example. Cross-sectional explanatory drawing which shows the state which chamfers with respect to the corner | angular part of a workpiece | work with the combination holder which mounted | wore the chip | tip for chamfering, and the chip | tip for internal diameter processing in an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Combination holder 10 Machine tool 100 Main shaft 2 Holder main-body part 20 Hollow hole 21 Coolant supply path 241 Tapered outer peripheral surface 242 Step surface 3 Tip mounting part 31 Annular side wall part 311 Tapered inner peripheral surface 312 Rear end face 313 Male thread part 32 Bottom part 321 Coolant Channel (channel groove)
33 Projection holding part 35 Coolant reservoir part 41 Retraction ring 411 Female thread part 42 Steel ball 5 Drill 50 Chip discharge groove 51 Cutting edge 52 Coolant hole 6 Additional machining tip 61 Cutting edge 8 Work piece 81 Working hole C Coolant

Claims (5)

A drill that is attached to a main spindle of a machine tool and is rotated by receiving the rotational force of the main spindle, and a drill for drilling, and a machining hole formed in the workpiece by the drill or a formation hole formed in the workpiece In addition, a combination holder provided with an additional processing tip for performing additional processing such as chamfering, counterbore, inner diameter processing,
The combination holder includes a holder main body portion that holds the rear end portion of the drill, and a tip mounting portion that engages with the outer periphery of the holder main body portion to hold the additional processing chip.
The holder body has a coolant supply path capable of supplying coolant therein.
The tip mounting portion includes an annular side wall portion that engages with an outer periphery of the holder main body portion, a bottom portion that covers the tip of the holder main body portion with the drill inserted, and the bottom portion toward the tip side of the drill. And a protrusion holding part for holding the additional processing chip.
In the part surrounded by the holder main body part, the annular side wall part and the bottom part, a coolant reservoir part capable of storing the coolant flowing out from the coolant supply path is formed,
The protrusion holding portion holds the additional processing tip in a state where the cutting edge of the additional processing tip is disposed in the chip discharge groove in the drill,
In the drill, a coolant hole for guiding the coolant in the coolant supply path from the rear end of the drill to the cutting edge at the tip is formed,
At least one of the annular side wall portion, the bottom portion, and the protrusion holding portion is formed with a coolant channel for allowing the coolant accumulated in the coolant accumulation space to flow to the blade edge of the additional machining tip. Combination holder. In claim 1, in the tip mounting portion, a plurality of the protruding holding portions are formed from the bottom portion, and the additional processing tips are held in the plurality of protruding holding portions, respectively.
On the outer periphery of the holder main body portion, a tapered outer peripheral surface that is reduced in diameter toward the tip side of the drill is formed,
A tapered inner peripheral surface having an inclined shape along the tapered outer peripheral surface is formed on the inner periphery of the annular side wall portion in the chip mounting portion,
The tapered inner peripheral surface of the annular side wall portion of the tip mounting portion faces the tapered outer peripheral surface of the holder main body portion, and the stepped surface formed at the rear end portion of the tapered outer peripheral surface faces the stepped inner surface. A combination holder, wherein the tip mounting portion is coaxially mounted on the holder main body portion on which the drill is mounted by bringing the rear end surface of the peripheral surface into contact. In Claim 2, the external thread part is formed in the perimeter of the above-mentioned annular side wall part in the above-mentioned chip mounting part,
A pull-in ring is attached to the outer periphery of the holder body through a plurality of steel balls arranged in the circumferential direction, and a female thread portion that is screwed into the male screw portion is formed on the inner periphery of the pull-in ring. And
A combination holder configured to draw the tip mounting portion into the holder main body portion by screwing the male screw portion and the female screw portion by turning the drawing ring. In Claim 2 or 3, the drill has a plurality of the cutting blade and the chip discharge groove,
The plurality of additional processing chips are all chamfering chips,
The cutting edges of the plurality of chamfering tips are arranged in the chip discharge grooves, respectively, and the position in the axial direction of the drill and the distance from the rotation center of the drill are the same. holder.   5. The coolant channel according to claim 1, wherein the coolant channel is a channel groove formed in an insertion port formed in the bottom portion of the tip mounting portion so as to allow the drill to be inserted. The combination holder is formed corresponding to the position of the additional processing tip with respect to the circumferential direction of the drill.

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