JP3740247B2 - Tool holder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tool holder for mounting a cutting tool on a spindle of a machine tool, and in particular, a structure for supplying a lubricating or cooling liquid supplied from a machine tool side to a cutting portion of a cutting tool through a main shaft. It is related with the tool holder provided with.
[0002]
[Prior art]
Conventionally known rotary cutting tools with an oil hole are designed to cool and lubricate the cutting edge by extracting the cutting oil supplied to the oil hole from the cutting edge, thereby making the cutting tool durable. There is a feature that the life can be extended and the finished surface can be improved.
[0003]
As a tool holder for such a rotary cutting tool with an oil hole, conventionally, a main shaft attached to a spindle of a machine tool, an oil passage in the main shaft for supplying oil to the tip of the rotary cutting tool with an oil hole through the main shaft, A case that rotatably supports the main shaft, an oil receiving mechanism that is connected to an oil supply base provided in the machine tool and receives oil from the machine tool, and an oil passage for sending the oil in the oil receiving mechanism to the inside of the case And a sealing mechanism that is interposed between the case and the main shaft are known.
[0004]
Furthermore, in order to facilitate replacement of the seal mechanism in this type of tool holder, a sleeve is detachably fixed to the main shaft side at the front end side of the case as a bearing, and is detachable from the case outside the sleeve. By fixing the oil-tight ring to the oil-tight ring and by detachably fixing the oil passage from the oil-receiving mechanism to the oil-tight ring, the seal mechanism can be replaced without disassembling the bearing part. Is known (see JP-A-7-1280).
[0005]
[Problems to be solved by the invention]
However, in the tool holder described in this publication, the oil-tight ring cannot be removed unless the oil passage is first removed. For this reason, there has been a problem that reduction in the number of man-hours for replacing the seal mechanism is not yet sufficient.
[0006]
In addition, since the bearing portion and the seal mechanism are separated, the oil-tight ring exhibits a behavior as a cylindrical body that is supported only at one end on the bearing portion side, and is caused by hydraulic pressure and spring pressure acting on the oil receiving mechanism. Thus, a force tilted with respect to the main shaft acts, whereby the inner surface of the oil-tight ring and the outer surface of the sleeve come into strong contact only on the oil receiving mechanism side.
[0007]
For this reason, in the tool holder described in the above publication, replacement of the seal mechanism is easier than before, but uneven wear occurs in the seal mechanism, and the frequency of replacement increases. From the viewpoint of replacement man-hours, there was a problem that man-hour reduction was insufficient, or conversely, man-hours could increase.
[0008]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to make it easy to attach and detach a seal mechanism, and thereby prevent uneven wear of the seal mechanism.
[0009]
[Means for Solving the Problems]
The tool holder of the present invention includes a main shaft attached to a spindle of a machine tool,
A flow path in the main shaft for supplying a liquid for lubrication and / or cooling to a cutting portion of a tool mounted on the main shaft through the main shaft;
A case for rotatably supporting the main shaft;
A liquid receiving mechanism for receiving the liquid from the liquid supply mechanism by being connected to a liquid supply mechanism provided in the machine tool;
A liquid passage mounted between the liquid receiving mechanism and the case, and for sending the liquid in the liquid receiving mechanism to the inside of the case through a liquid intrusion hole provided in the case;
A seal for the liquid that is interposed between the case and a sleeve that is fixed to the periphery of the main shaft and rotates integrally with the main shaft, and that is supplied into the case through the liquid intrusion hole. In a tool holder provided with a sealing mechanism to perform,
The case is provided with a bearing portion for rotatably supporting the main shaft, and a tool mounting side with respect to the bearing portion, and the seal mechanism is arranged so that the whole is substantially accommodated between the main shaft and the inner side thereof. Including an open space that can be inserted in the axial direction from the tool mounting side, and a seal storage portion to which the liquid passage is fixed outside.
The seal mechanism is fixed to the periphery of the main shaft and is in contact with the outer peripheral surface of a sleeve that rotates integrally with the main shaft , and the seal case that holds the seal and is detachably attached to the case side And consists of
The seal housing portion of the case is formed with a seal case detachment operation hole for detaching the seal case from the case by inserting a seal case detachment tool from the outside.
On the other hand, on the outer peripheral surface of the seal case inserted inside the case, a screw hole is provided at a position where the axis can coincide with the seal case attaching / detaching operation hole, and a set bolt is screwed into the screw hole. And the head of the retaining bolt is caught in the seal case attaching / detaching operation hole,
The seal case is against the case It is configured not to move in the axial direction toward the tool mounting side .
[0010]
According to the tool holder of the present invention, when replacing the seal or the sleeve, first, a removal tool is inserted from the operation hole of the case, the seal case is separated from the case, and this is removed. Similarly, a detaching tool is inserted from the operation hole to separate the sleeve from the main shaft, and this is removed. Of the seal case and the sleeve thus extracted, the parts that need to be replaced are replaced, and the seal mechanism is attached to the seal housing portion of the case again in the order of the sleeve and the seal case. At this time, the liquid passage connecting the liquid receiving mechanism and the case may not be removed. Therefore, the number of man-hours for replacement itself is smaller than before.
[0011]
Further, according to this tool holder, the seal mechanism is accommodated inside the case so as to be almost entirely accommodated, and the liquid passage from the liquid receiving mechanism is fixed to the case. The case supports the pressure. Therefore, the seal case is not directly subjected to such a liquid pressure or the like, and is unlikely to be in a biased contact state with the sleeve. Therefore, uneven wear of the seal is unlikely to occur, and the number of replacements is reduced as much as the life of the seal is extended. In particular, when the seal case is attached to the case so as to be slidable in the radial direction, this effect is further ensured.
[0012]
In addition, there is a gap between the case and the seal case so that the inclined case and the seal case do not come into contact with each other even if the case is inclined with respect to the main shaft by a force applied to the liquid receiving mechanism. It is better if it is formed. By configuring in this way, there is no risk of “the inclined case is unevenly contacted with the seal case, so that the seal is unevenly contacted with the sleeve and is unevenly worn”, and further reliability can be obtained with respect to the improvement of the life. Because.
[0013]
By the way, when the seal mechanism is mounted so as to be almost entirely inside the case as described above, each of the case, the seal mechanism, and the main shaft can be kept liquid-tight by a seal member such as an O-ring. As a result, the following problems may occur.
[0014]
One of them is that when you try to pull out the seal case of the seal mechanism that is assembled in such a liquid-tight state, if nothing is devised, the space behind it becomes negative pressure Therefore, it is a problem that it is difficult to extract the seal case. On the contrary, when the seal case is inserted, there is a possibility that the air in the back space does not escape well and the seal case cannot be easily inserted.
[0015]
Therefore, in the present invention, it is preferable that an atmosphere communication hole for communicating a space between the seal mechanism housed inside and the bearing portion to the atmosphere is formed in the seal housing portion of the case. This is because when the seal case is inserted and removed, the air in the space behind the seal case can freely flow through the air communication hole and does not obstruct the extraction and insertion. As a result, it is possible to easily replace parts of the seal mechanism, and it is possible to further reduce the number of man-hours for replacement.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present application will be described below with reference to the drawings. FIG. 1 shows a structure near a machining end in a machine tool, A is a machine tool main body such as a machining center, B is a tool holder for attaching a tool to the main body, and C is a tool.
[0017]
The machine tool main body A is well known, 2 is a frame, 3 is a spindle, 4 is a bearing, 5 is a holder mounting hole, and is formed in a tapered shape. 6 is an oil supply base attached to the frame 2, 7 is a recessed hole provided at the tip, 8 is an O-ring for sealing, 9 is an oil passage, and is connected to a pump for supplying oil as is well known. . The oil is, for example, cutting oil or coolant. In some cases, water may be used in addition to oil. In the present specification, these are collectively referred to as oil.
[0018]
Next, the tool holder B will be described.
The tool holder B includes a main shaft 20 rotated by the spindle 3, an oil receiving mechanism 30 for supplying oil to the tool C through the main shaft 20, and a case 40 that rotatably supports the main shaft 20 through a bearing 41. An oil receiving base 60 that connects the oil receiving mechanism 30 and the case 40, and a seal mechanism 70 that is provided between the case 40 and the main shaft 20 and that is provided for the oil supplied from the oil receiving mechanism 30.
[0019]
The spindle 20 has a tapered protrusion 21 fitted in the holder mounting hole 5 of the machine tool main body A, a holder holding member 22 having a groove 22a into which a manipulator not shown is fitted, and supplies oil to the tool C. The tool mounting hole 25 provided with the oil holes 23 and 24 for performing and the receiving tool 25a of the tool C is provided.
[0020]
The oil receiving mechanism 30 includes an oil receiving cylinder 31 fitted in the recessed hole 7 of the oil supply base 6 and a lid that holds the oil receiving cylinder 31 slidably in the axial direction and is fitted and fixed to the oil receiving base 60. The body 32 is comprised. Among these, a sleeve 33 is fitted in the oil receiving cylinder 31. A spring 34 is mounted on the right side of the sleeve 33 in the drawing to exert an urging force in a direction to push the oil receiving cylinder 31 away from the lid 32, and on the left side is a direction in which the valve body 35 is pressed against the valve seat 35a. A valve body pressing spring 36 that exerts power is attached. A locking piece 37 is screwed on the outside of the oil receiving cylinder 31. This locking piece 37 is for preventing the main shaft 20 from rotating when the magazine is mounted by being fitted into the fitting recess 26a of the locking ring 26 screwed to the main shaft 20.
[0021]
The lid 32 is formed with an oil hole 38 a for discharging oil from an oil chamber 38 formed by the lid 32 and the oil receiving cylinder 31. Further, a ring-shaped depression 32a is formed by including a part of the outer periphery of the lid 32 including the opening position of the oil hole 38a. Thereby, the oil filled in the oil chamber 38 is discharged to the oil receiving table 60 through the oil hole 38a and the recess 32a.
[0022]
As shown in FIG. 2, the case 40 has bearings 41 and 41 fitted in the left side of the figure, and the right side part from the center is an open space 42 in which the seal mechanism 70 can be inserted and removed. As shown in FIG. 3 in an enlarged manner, the inner race 41 a of each bearing 41 is supported by bearing holding rings 43 a and 43 b fitted to the main shaft 20 and a bearing fixing ring 44 a screwed to the main shaft 20. It is fixed on the side. On the contrary, the outer race 41b of each bearing 41 is sandwiched between a stepped portion 40a formed on the case 40 side and a bearing pressing ring 43c fitted in the case 40, and is also screwed into the case 40. It is fixed to the case 40 side by a fixing ring 44b. Each bearing fixing ring 44a, 44b is prevented from loosening by set screws 45, 45.
[0023]
An operation hole 46 for tightening or loosening the set bolt 71a of the seal case 71 is passed through the wall of the case 40 on the open space 42 side. Further, a stepped hole 47 through which the oil passage 61 of the oil receiving stand 60 is fitted and oil is introduced from the oil passage 61 is also penetrated. Further, two ring grooves 49 and 49 into which O-rings 48 and 48 are fitted are provided on the inner wall of the open space 42 so as to sandwich the operation hole 46 and the stepped hole 47 described above. A ring-shaped recess 50 that circulates around the inner wall surface is formed between the ring grooves 49 and 49. The case 40 is formed with an air communication hole 52 for communicating the left end space 51 of the open space 42 with the air.
[0024]
Next, the oil receiving stand 60 will be described. As shown in FIGS. 1 to 3, the oil receiving table 60 includes an oil passage 61 having one end fitted into the stepped hole 47 of the case 40 and the other end of the oil passage 61 and an oil receiving mechanism. The holding part 62 that is externally fitted to the cover body 32 of the 30 and a fixing part 63 that fixes the holding part 62 to the case 40 are configured. The holding portion 62 is formed with a stepped hole 64 similar to the stepped hole 47 of the case 40, and the oil passage 61 is fitted therein. The oil passage 61 communicates with the oil chamber 38 of the oil receiving mechanism 30 through the stepped hole 64, the small diameter portion 32a of the lid body 32, and the oil hole 38a. The oil passage 61 is sealed with O-rings 65 and 65 with respect to the stepped holes 47 and 63.
[0025]
Next, the seal mechanism 70 will be described. 3 and 4, the seal mechanism 70 includes a seal case 71 integrated to the case 40 side by a set bolt 71a, a sleeve 72 fixed to the main shaft 20 by a set bolt 72a, and a seal case. 71 and a seal 73 mounted between the sleeve 72 and the sleeve 72.
[0026]
Here, the sleeve 72 is made of, for example, steel, and a portion of the outer peripheral surface where the inner peripheral edge of the seal 73 is in sliding contact is hardened to increase wear resistance, for example, thermal spraying of a hard material such as ceramic or titanium nitride. Coating and hard chrome plating are applied. Alternatively, the sleeve 72 itself may be formed of a hard material. As shown in FIG. 4B, the sleeve 72 is provided with four circular holes 72b having a size through which the head of the set bolt 72a can be passed. Further, ring-shaped depressions 72c and 72d that circulate around the sleeve 72 are formed inside and outside the portion where the circular hole 72b is formed. The sleeve 72 is attached to the main shaft 20 from the right side in FIG. 1 so that the left end abuts the stepped portion 27 formed on the main shaft 20, and the set bolt 72 a is screwed into the screw hole 28 provided in the main shaft 20. Thus, the oil hole 23 and the circular hole 72b are fixed at substantially the same position. Note that O-rings 29 and 29 are mounted between the sleeve 72 and the main shaft 20 so that a seal between the two is maintained. The screw hole 28 is formed at a position where the axis of the operation hole 46 of the case 40 can coincide with the axis.
[0027]
One seal 73 is made of, for example, a material having high wear resistance and good slip, such as ethylene tetrafluoride. The seal 73 is fixed to the seal case 71 as shown in FIGS. The seal 73 is configured as a ring having a cross-sectional shape as shown in the figure from an inner seal piece 73a, an outer seal piece 73b, and a stopper piece 73c. Then, the sealing piece 73 c is sandwiched between the convex portion 74 of the seal case 71 and the seal holding ring 75, and the seal pressing ring 76 is screwed into the seal case 71 and tightened to fix the seal 73 to the seal case 71. Yes. Note that a set screw 76a for preventing loosening is screwed into the seal pressing ring 76.
[0028]
Further, the seal case 71 is formed with a screw hole 77 into which the above-described set bolt 71a is screwed, and an oil hole 78 through which oil flows in the oil chamber 38 toward the seal 73 side. The oil filled in the oil chamber 38 of the oil receiving mechanism 30 is, as shown by arrows in FIG. 3B, an oil hole 38a, a recess 32a, a stepped hole 64, an oil passage 61, a stepped hole 47, and a recess 50. The oil hole is introduced into the space in which the seal 73 is mounted through the oil hole 78, and further enters the oil hole 23 of the main shaft 20 through the recess 72d, the circular hole 72b, and the recess 72c of the sleeve 72, and further extends in the axial direction. 24 enters the oil hole 81 of the tool receiver 25a, passes through an oil passage 82 formed in the tool C mounted on the tip, and is supplied to the tip of the tool C. Yes.
[0029]
Here, in the present embodiment, as shown in FIGS. 1, 3, and 5, a gap 91 is intentionally formed between the case 40 and the seal case 71. The gap 91 is for keeping the seal case 71 floating with respect to the case 40 and ensuring a space of a predetermined size defined by the O-rings 48 and 48 and the case 40 and the seal case 71. It is. A gap 92 is also provided between the set bolt 71 a and the operation hole 46. An O-ring 71b is mounted on the outer periphery of the head of the set bolt 71a to prevent oil leakage from the operation hole 46. The seal case 71 is attached to the case 40 so as to be movable in the radial direction when the head of the set bolt 71a is caught in the operation hole 46.
[0030]
Next, the usage method and usage state of the above configuration will be described.
In the state in which the tool holder B having the above configuration is housed in the magazine, the locking piece 37 is fitted into the fitting recess 26a and the rotation of the spindle 20 is prevented. When the tool holder B is mounted on the machine tool body A, the protrusion 21 of the main shaft 20 is inserted in the axial direction toward the mounting hole 5 of the spindle 3 and connected as is well known. Then, the oil receiving cylinder 31 of the oil receiving mechanism 30 abuts against the oil supply base 6 and is pushed toward the inside of the lid body 32. As a result, the locking piece 37 is disengaged from the fitting recess 26a, and the rotation of the main shaft 20 is performed. It becomes a free state.
[0031]
When the spindle 3 rotates in the mounted state, the main shaft 20 rotates integrally, and the tool C also rotates together to perform a known cutting process. The rotation speed of the main shaft 20 is, for example, about several hundred to 8,000 rotations per minute. In this process, the oil sent through the oil passage 9 of the oil supply base 6 pushes the valve 35 open and flows into the oil receiving cylinder 31, and as described above, passes through the oil chamber 38, the oil passage 61, etc., and the seal case 71. , Further enters the main shaft 20 and is supplied to the tip of the tool C. This oil provides lubrication or cooling during the cutting operation.
[0032]
During the oil supply, the seal 73 prevents oil leakage between the sleeve 72 and the seal case 71. In this case, since the seal 73 having the above-described shape is used, the higher the pressure of the oil to be fed, the higher the inner and outer seal pieces 73a and 73b, the outer peripheral surface of the sleeve 72 and the inner wall of the seal case 71, respectively. To prevent oil leakage. Here, since the sleeve 72 and the seal 73 are rubbed with each other, they are gradually worn out. Therefore, replacement of the sleeve 72 and the seal 73 when they are worn will be described.
[0033]
In replacing the sleeve 72 and the seal 73, first, the base 93 provided at the tip of the main shaft 20 is removed. Subsequently, a tool is inserted from the operation hole 46, and the set bolt 71a is loosened and extracted. Thereby, the seal case 71 becomes free with respect to the case 40, and can be pulled rightward in FIG.
[0034]
After the seal case 71 is pulled out in this manner, the tool is inserted again from the operation hole 46, and the set bolt 72a that prevents the sleeve 72 from being pulled out is loosened and pulled out. As a result, the sleeve 72 is now free from the main shaft 20, and the sleeve 72 can also be pulled out in the right direction in FIG.
[0035]
As described above, in the present embodiment, by adopting a structure in which the part for housing the bearings 41 and 41 and the part for housing the seal mechanism 70 in the case 40 are separated in the axial direction, the bearings 41 and 41 are removed. The seal 73 and the sleeve 72 can be replaced without disassembling. Further, since the seal mechanism 70 is accommodated inside the case 40 so as to be almost entirely accommodated and the oil passage 61 is connected to the case 40, the oil passage 61 is removed when the seal mechanism 70 is replaced. It does not have to be. Therefore, the man-hours required for replacing the seal mechanism 70 can be further reduced as compared with the prior art. Moreover, although the seal mechanism 70 is almost completely housed inside the case 40, the left end space 51 of the open space 42 is communicated with the atmosphere by the atmosphere communication hole 52, so that the seal case 71 is inserted and removed. At the same time, the atmosphere is supplied to and discharged from the open space 42 to enable smooth insertion and removal. That is, it can be said that the provision of the air communication hole 52 exerts a more advantageous effect on the reduction of the number of replacement steps as described above.
[0036]
By the way, in such a tool holder B, in the oil receiving mechanism 30, the internal spring 34 applies a force for pushing the lid 32 in the axial direction, and the internal pressure of the oil chamber 38 is also applied. For this reason, the case 40 receives these forces via the oil passage 61 and is inclined with respect to the main shaft 20. An XX cross section at that time is shown in FIG. As can be seen from comparison with FIG. 3A, the gap 91 between the case 40 and the seal case 71 is narrower on the oil passage 61 side. However, in the present embodiment, as described above, since the gap 91 is intentionally provided between the case 40 and the seal case 71, the case 40 and the seal are sealed even when the case 40 is inclined in this way. Case 71 does not contact. Therefore, the contact pressure between the seal 73 and the sleeve 72 does not vary depending on the part, and the seal 73 does not wear unevenly. In other words, uneven wear of the seal 73 can be prevented by providing a gap 91 that does not allow the seal case 71 and the case 40 to come into contact with each other even when the case 40 is inclined by the pressure or hydraulic pressure of the spring 34. What is necessary is just to determine the dimension of the clearance gap 91 from such a viewpoint. The specific dimension of the gap 91 may be determined according to the dimension, material, structural characteristics, and the like of the tool holder B, and may be, for example, about 0.05 mm to 0.3 mm. Of course, it is good also as a clearance gap wider than this. However, if it is too wide, the sealing performance by the O-ring may not be sufficiently maintained, so this point needs to be noted.
[0037]
As mentioned above, although one embodiment of the present invention has been described, the present invention is not limited to this and can be implemented in various modes.
[0038]
【The invention's effect】
As described above, in the present invention, when replacing the seal mechanism in the tool holder, it is not necessary to disassemble the bearing portion, and the liquid passage connecting the liquid receiving mechanism and the case may be left as it is. The seal mechanism can be replaced with very few man-hours.
[0039]
In addition, with regard to the problem of uneven wear that has occurred in the past as a result of having a structure that does not require disassembly of the bearing portion in this way, a liquid passage is connected to the case so that the seal case itself is not pressed directly. Improvement is achieved by configuring. In particular, according to the third and fourth aspects, even if the case is tilted, it can be prevented from tilting to the seal case, which is effective for shortening the life due to uneven wear, and can further reduce man-hours. I have to.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a relationship between a tool holder and a machine tool body in an embodiment.
FIG. 2 is a cross-sectional view of a tool holder in the embodiment.
FIG. 3 is a partially enlarged cross-sectional view of the tool holder in the embodiment.
FIG. 4 is an enlarged cross-sectional view of parts constituting a seal mechanism of the tool holder in the embodiment.
FIG. 5 is an enlarged cross-sectional view of the portion XX in FIG. 1 showing the operation of the tool holder in the embodiment.
[Explanation of symbols]
20 Main shaft 30 Oil receiving mechanism 38 Oil chamber 40 Case 41 Bearing 42 Open space 46 Operation hole 52 Atmospheric communication hole 60 Oil receiving table 61 Oil passage 70 Seal mechanism 71 Seal case 71a Stop bolt 72 Sleeve 72a Stop bolt 73 Seal 91 Clearance 92 Clearance

Claims (4)

A spindle attached to the spindle of the machine tool;
A flow path in the main shaft for supplying a liquid for lubrication and / or cooling to a cutting portion of a tool mounted on the main shaft through the main shaft;
A case for rotatably supporting the main shaft;
A liquid receiving mechanism for receiving the liquid from the liquid supply mechanism by being connected to a liquid supply mechanism provided in the machine tool;
A liquid passage mounted between the liquid receiving mechanism and the case, and for sending the liquid in the liquid receiving mechanism to the inside of the case through a liquid intrusion hole provided in the case;
A seal for the liquid that is interposed between the case and a sleeve that is fixed to the periphery of the main shaft and rotates integrally with the main shaft, and that is supplied into the case through the liquid intrusion hole. In a tool holder provided with a sealing mechanism to perform,
The case is provided with a bearing portion for rotatably supporting the main shaft, and a tool mounting side with respect to the bearing portion, and the seal mechanism is arranged so that the whole is substantially accommodated between the main shaft and the inner side thereof. Including an open space that can be inserted in the axial direction from the tool mounting side, and a seal storage portion to which the liquid passage is fixed outside.
The seal mechanism is fixed to the periphery of the main shaft and is in contact with the outer peripheral surface of a sleeve that rotates integrally with the main shaft , and the seal case that holds the seal and is detachably attached to the case side And consists of
The seal housing portion of the case is formed with a seal case detachment operation hole for detaching the seal case from the case by inserting a seal case detachment tool from the outside.
On the other hand, on the outer peripheral surface of the seal case inserted inside the case, a screw hole is provided at a position where the axis can coincide with the seal case attaching / detaching operation hole, and a set bolt is screwed into the screw hole. And the head of the retaining bolt is caught in the seal case attaching / detaching operation hole,
The seal case is against the case A tool holder configured not to move in the axial direction toward the tool mounting side . The tool holder according to claim 1, wherein
The sleeve fixed to the periphery of the main shaft and rotating integrally with the main shaft is fixed to the main shaft with a set bolt,
The tool holder, wherein the seal case attaching / detaching operation hole also serves as an attaching / detaching operation hole of the sleeve fixing set bolt . The tool holder according to claim 1 or 2,
The tool holder, wherein the seal case is attached so as to be slidable in a radial direction with respect to the case. The tool holder according to claim 3,
A gap is formed between the case and the seal case so that the inclined case and the seal case do not come into contact with each other even when the case is inclined with respect to the main shaft by a force applied to the liquid receiving mechanism. A tool holder characterized by that.

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