JP4157866B2 - Tool mount - Google Patents

Description

  The present invention relates to a tool mount for holding a tool holder when the tool is attached to the tool holder.

  2. Description of the Related Art Conventionally, a tool clamp stand, that is, a tool mounting base that holds a tool holder in an upright state, for example, has been used in order to grip the tool with respect to the tool holder. This tool mounting base has a holding hole for inserting the tool holder, and has a mechanism for preventing the tool holder from swirling when the holder nut is tightened to hold the tool. This mechanism consists of an engagement protrusion that engages with a key groove that is conventionally provided in the flange portion of the tool holder, and an engagement hole that engages with a nut portion provided at the base end of the tool holder. .

  However, if a key groove is formed on the outer peripheral surface of the tool holder or a nut portion is formed on the base end portion of the tool holder in this way, when the tool holder is rotated at a high speed, the presence of these key grooves and nut portions The problem arises that the rotational balance is lost and vibration is generated. In addition, there is a problem that forming these key grooves and nuts leads to an increase in processing steps.

  Therefore, the present invention can reliably hold a tool holder having a good balance during high-speed rotation and a small number of machining steps, i.e., a cylindrical tool holder whose outer peripheral surface is smooth at least in the circumferential direction. An object of the present invention is to provide a tool mounting base that can prevent the tool holder from rotating around when the holder is tightened.

  In order to achieve the above object, the present invention provides a tool mounting base for holding a tool holder when the tool is mounted by rotating the rotating portion of the tool holder, and the tool holder is inserted into the outer peripheral cylinder of the tool holder. A holding hole for holding a wedge member made of a cylindrical roller is provided on the inner peripheral surface of the holding hole, and the holding means is disposed on the inner peripheral surface of the tool mount. A retainer that holds the wedge member movably at a predetermined interval in the circumferential direction, and a groove that is formed on the inner peripheral surface of the tool mount and that determines the depth of the wedge region and the play region that accommodates the wedge member. The wedge region is continuously formed on both sides in the circumferential direction of the play region, and the wedge member is freed by rotation in one circumferential direction of the rotating portion when the tool is attached to the tool holder. One side from the area It moves to the area and is configured to bite between the outer peripheral surface of the tool holder and the wall surface of the wedge area, and when removing the tool from the tool holder, it is opposite to the one circumferential direction of the rotating portion. A tool mounting base configured to move to the other wedge region in the direction and bite between the outer peripheral surface of the tool holder and the wall surface of the wedge region is provided.

  A step that can contact the flange portion of the tool holder can be formed on the inner peripheral surface of the holding hole.

  It is preferable that a biasing unit that biases the wedge member from the play area toward the wedge area is provided. In addition, biasing means for biasing the retainer from the play area toward the wedge area may be provided.

  In addition, the tool mounting base according to the present invention can be configured so that the two holding holes are provided and fixed when the tool holders inserted into the holding holes are rotated in different directions. .

  Furthermore, the tool mount according to the present invention is configured so that one holding hole is provided, and the inner peripheral surface of the holding hole is composed of inner peripheral surfaces in both directions of a wedge ring formed separately. You can also.

  Further, the wedge ring can be detachably mounted in the holding hole upside down, and can be configured to be fixed when the inserted tool holders are rotated in different directions.

  According to the present invention, the wedge member is caught between the outer peripheral surface of the tool holder and the inner peripheral surface of the tool mount by rotating the holder nut of the tool holder and rotating the tool holder in one circumferential direction thereof. Thus, the tool holder and the tool mount are integrated in one circumferential direction, and the tool holder can be fixed to the tool mount so as not to rotate in one circumferential direction of the tool holder. As a result, the holder nut can be rotated in one circumferential direction with respect to the tool holder, and the processing tool can be gripped by the tool holder. Therefore, it is not necessary to provide a keyway or the like for engaging with the tool mount on the outer peripheral surface of the tool holder, and the outer peripheral surface can be smoothly formed. As a result of eliminating the need to provide a keyway or the like on the outer peripheral surface of the tool holder in this way, the balance during high-speed rotation can be maintained, and the tool holder can be easily machined.

  According to the present invention, a tool holder having a good balance during high-speed rotation and a small number of machining steps, that is, a cylindrical tool holder having an outer peripheral surface that is smooth at least in the circumferential direction can be reliably held. It is possible to provide a tool mounting base capable of preventing the tool holder from rotating around when the holder is tightened.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a tool holder, that is, a chuck body 10 mounted by a tool mount according to this embodiment. The chuck body 10 is mainly mounted on a machining center or other spindle head (not shown), and is tapered to the proximal end direction, that is, tapered toward the left in FIG. The chuck positioning flange portion 14 formed in this manner and a chuck cylinder 16 that protrudes further integrally from the flange portion 14 in the distal direction. On the outer peripheral surface of the flange portion 14, a key groove or the like for torque transmission which has been conventionally provided is not formed, and has a smooth surface at least in the circumferential direction. For this reason, even when the chuck body 10 used in this embodiment is rotated at a high speed, the rotation balance can be maintained. The machining that requires high-speed rotation of the tool is usually small-diameter machining, and the transmission torque is also small. Therefore, even if there is no engagement with the main shaft by the keyway, the friction between the taper shank portion 12 and the inner surface of the main shaft. Only torque transmission is sufficient. Further, a T-shaped protrusion 17 is formed at the proximal end of the taper shank portion 12, and the chuck body 10 is fixed to the spindle head by pulling the protrusion 17. Also here, a nut portion or the like for engagement with a tool mount described later is not provided.

  The chuck cylinder 16 has an inner peripheral surface 18 that receives a straight shank portion or a collet of a tool to be gripped, and an outer peripheral surface 20 of the chuck cylinder 16 is formed in a tapered shape that tapers in the distal direction. A holder nut 22 is loosely fitted on the outer peripheral surface of the chuck cylinder 16, and the holder nut 22 is formed in a tapered shape that tapers toward the distal end corresponding to the outer peripheral surface 20 of the chuck cylinder 16. A peripheral surface 24 is provided. A plurality of needle rollers 26 are interposed between the holder nut 22 and the chuck cylinder 16, and these needle rollers 26 are rotatably held by a retainer 28. Then, by rotating the holder nut 22, the needle roller 26 revolves spirally with respect to the outer peripheral surface 20 of the chuck cylinder 16 while rotating, whereby a tool gripping force is applied to the chuck cylinder 16. . Further, the outer periphery of the holder nut 22 is not provided with a groove or knurling for hooking a conventional spanner for tightening the holder nut, and the balance at the time of high-speed rotation is also secured here. The holder nut 22 can be rotated by a special spanner (not shown) that can give a rotational torque even to a smooth surface in the circumferential direction.

  FIG. 2 is a partially cutaway side view of the tool mounting base 32 according to the present embodiment, and FIG. 3 is a plan view thereof. As shown in FIG. 2, the tool mounting base 32 is formed in a U-shape as a whole, and includes a holding portion 34 that holds the chuck body 10 and a column portion that is formed downward following the holding portion 34. 36 and a base portion 38 that supports the holding portion 34 via the pillar portion 36.

  The holding portion 34 is formed to have a predetermined thickness, and as shown in FIG. 3, a pair of holding holes into which the chuck body 10 is inserted and the outer peripheral surface 15 of the flange portion 14 of the chuck body 10 is held. That is, it has a fastening holding hole 40A and a loosening holding hole 40B. As shown in FIG. 2, each holding hole 40A, 40B is penetrated from the upper surface to the bottom surface of the holding portion 34, and has a step 42 projecting radially inward in the vicinity of the middle portion thereof. Above the step 42 of each holding hole 40A, 40B has an inner diameter slightly larger than the outer diameter of the flange portion 14, and below the step 42 has an inner diameter smaller than the outer diameter of the flange portion 14. Yes. With this configuration, when the chuck body 10 is inserted into the holding holes 40A and 40B, the flange portion 14 abuts on the step 42, so that the chuck body 10 falls off the tool mounting base 32. Can be prevented. In addition, a wedge mechanism, which will be described later, is provided on the inner peripheral surface 44 of each holding hole 40A, 40B.

  4 is a partial cross-sectional view of the holding hole 40A for tightening along the line IV-IV in FIG. 2, and the wedge mechanism has an appropriate interval in the circumferential direction of the inner peripheral surface 44 as shown in FIG. A plurality of cylindrical wedge members 46, grooves 48 for accommodating the respective wedge members 46, and coil-like springs 50 for urging each wedge member 46 in the clockwise direction of FIG. Yes. Each groove 48 is recessed from the inner peripheral surface 44 of the holding hole 40A and extends a predetermined length in the axial direction (a direction perpendicular to the paper surface of FIG. 4) so as to accommodate the cylindrical wedge member 46. Further, the groove 48 is configured by continuously forming a play area 52 which is a relatively deep groove and a wedge area 54 shallower than the play area 52 in the circumferential direction. The play area 52 has a sufficient capacity to accommodate the wedge member 46 in a rollable manner, and the depth thereof is such that a part of the wedge member 46 slightly protrudes inward from the inner peripheral surface 44. It is formed smaller than the diameter. The depth of the wedge region 54 is relatively shallow so that the wedge member 46 bites in a wedge shape with the outer peripheral surface 15 of the flange portion 14. Further, the spring 50 is housed in the spring housing portion 56 and urges the wedge member 46 in the clockwise direction, that is, from the play area 52 toward the wedge area 54. As shown in FIG. The wedge member 46 is located in the wedge region 54 in a normal state where it is not mounted on the wedge. A protrusion 58 is formed at the groove end opposite to the spring accommodating portion 56, and the wedge member 46 is prevented from dropping from the groove 48 by the urging of the protrusion 58 and the spring 50.

  Further, the wedge mechanism of the loosening holding hole 40B is configured to exhibit a wedge action in the opposite direction to the wedge mechanism of the holding hole 40A as shown in FIG. That is, the wedge area 54 of the holding hole 40A is formed in the clockwise direction with respect to the play area 52, that is, the direction of the arrow A in FIG. In contrast, it is formed on the counterclockwise direction (the direction of arrow B in FIG. 5). Further, in the holding hole 40B, the spring 50 is arranged to urge the wedge member 46 from the play area 52 toward the wedge area 54, that is, counterclockwise.

  Next, the operation of this embodiment will be described. First, when mounting a processing tool such as a drill or an end mill on the chuck cylinder 16, the chuck body 10 is inserted into the holding hole 40A for tightening as shown in FIG. As a result, the wedge member 46 comes into contact with the flange portion 14 and is pressed by the outer peripheral surface 15 of the flange portion 14 to move from the wedge region 54 to the play region 52, that is, from the state shown in FIG. 6 to the state shown in FIG. Since the play area 52 accommodates the wedge member 46 with play, the play area 52 does not bite into the flange portion 14. Therefore, when the chuck body 10 is inserted into the holding hole 40A, the outer peripheral surface of the wedge member 46 is in contact with the outer peripheral surface 15 of the flange portion 14, but the work is not obstructed, and the chuck main body 10 is smoothly inserted into the holding hole 40A. can do.

  Next, when the chuck body 10 is rotated in the direction in which the holder nut 22 in FIG. 6 is fastened to the chuck body 10, that is, in the clockwise direction (the direction of arrow A in FIG. 4), the wedge member 46 has a play area 52 in the groove 48. The inner peripheral surface of the flange portion 14 and the outer peripheral surface 15 of the flange portion 14 are in contact with each other and by the urging force of the spring 50, the roller 50 moves relatively clockwise while rotating. Here, for the rotation of the holder nut 22, it is preferable to use a wrench (not shown) capable of transmitting sufficient rotational torque even to a smooth circumferential surface. When the wedge member 46 moves relative to the clockwise direction, the wedge member 46 is positioned in the wedge region 54, and the wedge member 46 is disposed on the wall surface of the wedge region 54 and the outer peripheral surface 15 of the flange portion 14 as shown in FIG. 8. The chuck body 10 is integrated and fixed to the mounting tool. When a further force is applied to the chuck body 10 in the tightening direction of the holder nut 22, the chuck body 10 is fixed in the tightening direction with respect to the tool mounting base, so the holder nut 22 is rotated in the tightening direction. be able to. By this rotation, the inner peripheral surface 18 of the chuck cylinder 16 can be contracted, and a processing tool such as a drill or an end mill can be gripped by the inner peripheral surface 18 of the chuck cylinder 16.

  Next, when removing the chuck body 10 from the holding hole 40A, if the chuck body 10 is rotated in a direction opposite to the tightening direction, that is, counterclockwise, the wedge member 46 moves relatively counterclockwise, and the groove It is accommodated in 48 play areas 52. Since the play area 52 is a deep groove as described above, the outer peripheral surface of the wedge member 46 does not bite into the wall surface of the wedge area 54 and the outer peripheral surface 15 of the flange portion 14. It can be taken out from 40A.

  Next, when removing a processing tool such as a drill or an end mill from the chuck cylinder 16, first, the chuck body 10 is loosened and inserted into the holding hole 40B. Next, when the machining tool is mounted on the chuck cylinder 16, that is, when the chuck body 10 is rotated in the loosening direction of the holder nut 22 (in the direction of arrow B in FIG. 5), the chuck body 10 is moved by the wedge action. It is integrated with the mounting base and fixed clockwise. Accordingly, the holder nut 22 can be rotated in the loosening direction of the holder nut 22 with respect to the chuck body 10 by hooking the spanner on the recess 30 formed on the outer peripheral surface of the holder nut 22, and this rotation causes the chuck cylinder to rotate. The inner peripheral surface 18 of 16 is expanded, and the machining tool can be removed from the chuck cylinder 16.

  As described above, if the tool mounting base of the present embodiment is used, the chuck body can be provided without providing a key groove or the like on the outer peripheral surface of the chuck body to prevent the chuck body from rotating when the holder nut is tightened. Can be fixed in one circumferential direction with respect to the tool mount, and the tool holder can be prevented from being swung. For this reason, the chuck body used in the tool mount of the present embodiment can maintain a balance during high-speed rotation and can reduce the number of machining steps.

  In the present embodiment, the wedge member 46 is formed in a cylindrical shape, but it is not necessary to be limited to this, and it is sufficient if it rolls. For example, it may be formed in a spherical shape. Further, in the chuck main body 10 used in the present embodiment, the outer peripheral surface is smoothly formed and no groove or the like is provided. However, the present invention is not limited to this, and for example, it is indicated by two-dot oblique lines in FIG. The torque transmission key groove 59 previously provided may be formed as described above. Even in this case, it is not necessary to insert the chuck body 10 into the tool mount in accordance with the position of the key groove 59, and it can be used at any position on the circumference, so that the tool mount of the chuck body 10 can be used. There is an advantage that the insertion operation becomes easier. In this embodiment, the coiled spring 50 is used as the spring. However, the present invention is not limited to this. For example, a leaf spring may be used.

  FIG. 9 shows a second embodiment of the present invention. The present embodiment is different from the first embodiment in that an annular wedge ring 61 is detachably provided on the inner peripheral surface 44 of the holding hole 40, and the wedge ring 61 has a wedge similar to the above-described embodiment. A mechanism, that is, a wedge member 46, a groove 48 forming a play area 52 and a wedge area 54, and a spring 50 are provided. The wedge ring 61 can be mounted in the holding hole 40 even if it is turned upside down. By doing so, the biting direction of the wedge mechanism can be reversed.

  As described above, by providing the detachable wedge ring 61, the direction in which the wedge ring 61 is mounted on the tool mounting base is changed between when the machining tool is mounted on the chuck cylinder 16 and when it is removed from the chuck cylinder 16. Therefore, only one holding hole 40 is required as shown in FIG.

  FIG. 10 shows a third embodiment of the present invention. The present embodiment is different from the first embodiment in that an annular retainer 60 is fixed to the inner peripheral surface 44 of the holding hole 40, and a wedge member 46 is inserted into a plurality of receiving grooves 62 formed in the retainer 60. And a plate spring 50 'in place of the coil spring.

  The retainer 60 is formed in an annular shape, and a protrusion 64 protruding outward is engaged with a recess 66 formed in a part of the inner peripheral surface 44 of the holding hole 40, whereby the inner periphery of the holding hole 40 is retained. It is fixed to. The leaf spring 50 ′ is formed in an arc shape whose central portion protrudes toward the wedge member 46, and urges the wedge member 46 toward the wedge region.

  As described above, the wedge member is movably held by the retainer 60, and the play area 52 and the wedge area 54 are configured by the relatively shallow groove 48 formed in the inner peripheral surface 44 of the holding hole 40. Compared with the first embodiment in which both regions are formed only by the inner peripheral surface 44 and the wedge member is held, the processing of the inner peripheral surface 44 of the holding hole 40 is easy.

  11 to 13 show a fourth embodiment of the present invention. The difference between this embodiment and the third embodiment is that the retainer 60 is not fixed to the inner peripheral surface 44 of the holding hole 40, and the entire retainer 60 rotates in the circumferential direction of the holding hole 40. The wedge member 46 is moved from the play area 52 to the wedge area 54, and biasing means are not provided for each wedge member 46, but by providing the retainer 60 with biasing means, each wedge member 46 is moved to the play area 52. This is a point where the hoop wedge region 54 is biased and a point where only one holding hole 40 is provided. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The tool mounting base 32 in this embodiment is mainly composed of a tool mounting base body 33, a cylindrical retainer 60 installed on the inner peripheral surface 44 of the tool mounting base body 33, and a spring that biases the retainer 60 in one circumferential direction. 68 and a lid 70 that holds the spring 68 in place.

  More specifically, the retainer 60 is installed on the inner peripheral surface 44 of the holding hole 40 so as to be rotatable in the circumferential direction. The retainer 60 accommodates the wedge member 46 so as to be rotatable and immovable in the circumferential direction. A plurality of receiving grooves 62 are formed at appropriate intervals in the circumferential direction. By configuring the retainer 60 so that the wedge member 46 is accommodated in this manner, in the present embodiment, the plurality of wedge members 46 move integrally with the retainer 60 in the circumferential direction. Also in this embodiment, the play area 52 and the wedge area 54 are constituted by the groove 48 of the inner peripheral surface 44 of the holding hole 40. Each groove 48 in the present embodiment is configured by forming the wedge region 54 continuously on both sides in the circumferential direction of the play region 52. With this configuration, the groove 48 can be easily formed. Reference numeral 72 denotes a stopper that prevents the wedge member 46 from moving from the play area 52 to the wedge area 54 on the counterclockwise direction, so that the wedge member 46 is connected to the play area 52 and the clockwise wedge area. It can be ensured that it only moves between 54. Therefore, the chuck body 10 has a function of locking with the flange portion 14 only when the chuck body 10 is rotated in one direction.

  The spring 68 is formed in a substantially annular shape as shown in FIG. 14, and small protrusions 74 and 76 are formed at both ends thereof. One small protrusion 74 is fitted in a fitting groove (not shown) formed on the upper surface of the retainer 60, and the other small protrusion 76 is fitted in a fitting groove (not shown) formed in the lid body 70. Mated. With this configuration, the retainer 60 is always biased in the direction in which the wedge member 46 moves from the play area 52 toward the wedge area 54.

  As described above, according to the fourth embodiment, the wedge member 46 can be urged from the play area 52 to the wedge area 54 by one spring, so that the number of parts can be reduced and the assembly can be simplified. .

  FIG. 15 shows a fifth embodiment of the present invention. In this embodiment, unlike the first embodiment, as shown in FIG. 17, the wedge regions 54 are continuously formed on both sides in the circumferential direction of the play region 52. A recess groove 78 that is recessed from the wall surface is formed on the wall surface of the play area 52, and a cylinder 80 is provided along the recess groove 78 so as to be able to appear and retract. The cylinder 80 is always urged toward the center of the holding hole 40 by a pair of leaf springs 50 ′. In a normal state before the flange portion 14 is attached to the holding hole 40, the cylinder 80 is depressed. Projecting from the groove 78 into the groove 48. For this reason, as shown by the solid line in FIG. 17, the wedge member 46 before mounting the flange portion 14 in the holding hole 40 is pressed by the column 80 and is positioned in either the left or right wedge region 54. Both ends of the wedge member 46 are provided with boss portions 82. The boss portions 82 are fitted into fitting grooves 84 provided on both side surfaces of the groove 48, that is, the left and right side surfaces of FIG. The wedge member 46 is prevented from falling out of the groove 48.

  Next, the operation of this embodiment will be described. First, when the flange portion 14 is inserted into the holding hole 40, the wedge member 46 comes into contact with the outer peripheral surface 15 of the flange portion 14 and is pressed by the outer peripheral surface 15 of the flange portion 14 as indicated by a two-dot chain line in FIG. 16. Escape from the wedge area 54 to the play area 52 and retract the cylinder 80 against the biasing force of the spring 50 '. Therefore, the chuck body 10 can be smoothly inserted into the holding hole 40.

  Next, in the case where the machining tool is gripped by the chuck cylinder 16, when the chuck body 10 is rotated counterclockwise, the wedge member 46 rotates toward the wedge region 54 on the clockwise side as shown by a solid line in FIG. 17. It moves and is pushed into the wedge region by the projecting output of the cylinder 80, and bites in a wedge shape between the wall surface of the wedge region 54 and the outer peripheral surface 15 of the flange portion 14, and the chuck body 10 and the tool mounting base 32 are integrated. It becomes. For this reason, when the holder nut 22 is further rotated in the same direction, the inner peripheral surface 18 of the chuck cylinder 16 contracts and the machining tool is gripped by the chuck cylinder 16.

  Next, when the chuck body 10 is taken out from the holding hole 40, if the chuck body 10 is slightly rotated counterclockwise, the wedge member 46 moves relatively counterclockwise to enter the play area 52 of the groove 48. Stored. Thereby, the chuck body 10 can be easily taken out from the holding hole 40 as in the above embodiment.

  Next, when the machining tool is taken out from the chuck cylinder 16, when the chuck body 10 is rotated counterclockwise, the wedge member 46 is moved relatively to the wedge region 54 on the counterclockwise side. The chuck body 10 and the tool mount are integrated with each other in a wedge shape between the wall surface and the outer peripheral surface 15 of the flange portion 14. For this reason, by rotating the holder nut 22 counterclockwise, the inner peripheral surface 20 of the chuck cylinder 16 is expanded, and the machining tool can be removed from the chuck cylinder 16.

  As described above, according to the present embodiment, there is no need to change the holding hole into which the chuck body 10 is inserted depending on whether the machining tool is attached or removed.

The notch sectional drawing of the chuck | zipper used for the tool mounting base concerning a present Example is shown. It is a partially cutaway view of the tool mounting base according to the present embodiment. It is a top view of a tool mounting base. It is sectional drawing along the IV-IV line of FIG. It is sectional drawing along the IV-IV line of FIG. It is an enlarged view of the wedge mechanism before attaching a chuck | zipper main body to a holding hole. It is an enlarged view of the wedge mechanism when the chuck body is mounted in the holding hole. It is an enlarged view which shows the state which the wedge member engulfed between the wall surface of a wedge area | region, and the outer peripheral surface of a flange part. It is a disassembled perspective view of the 2nd Example of this invention. It is principal part sectional drawing which shows the 3rd Example of this invention. It is a partially notched top view which shows the 4th Example of this invention. It is sectional drawing along the XII-XII line | wire of FIG. It is sectional drawing of the same position as FIG. 8 of 4th Example. It is a perspective view of the spring used for the 4th example. It is sectional drawing which shows the 5th Example of this invention. It is sectional drawing along the XVI-XVI line | wire in FIG. It is sectional drawing along the XVII-XVII line | wire in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tool holder 32 Tool mounting base 40 Holding hole 44 Inner peripheral surface 46 Wedge member

Claims (1)

A tool mount for holding the tool holder when the tool is mounted by rotating the rotating part of the tool holder,
Having a holding hole in which the tool holder is inserted and the outer cylindrical portion of the tool holder is held;
A holding means for holding a wedge member made of a cylindrical roller is provided on the inner peripheral surface of the holding hole,
The holding means is
A retainer that is disposed on the inner peripheral surface of the tool mount and holds the wedge member movably at a predetermined interval in the circumferential direction;
A groove that is formed on the inner peripheral surface of the tool mount and that determines the depth of the wedge area and the play area that accommodates the wedge member;
With
The wedge area is continuously formed on both sides in the circumferential direction of the play area,
When the tool is attached to the tool holder, the wedge member moves from the play area to the one wedge area by rotation in one circumferential direction of the rotating part, and moves between the outer peripheral surface of the tool holder and the wall surface of the wedge area. When the tool is removed from the tool holder, the outer peripheral surface of the tool holder is moved to the other wedge region by rotating in the direction opposite to the one circumferential direction of the rotating portion. A tool mounting base configured to bite between the wall surface of the wedge region.