JPH09300103A - Hanging over main shaft structure with balance adjusting mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the unbalanced force around a rotary shaft, by installing a balance adjusting mechanism part to be balanced with a hanging over mechanism part at a symmetrical position of the hanging over mechanism part with the rotary shaft as the center. SOLUTION: The rotation of a bevel gear 9 is simultaneously transmitted to both of the bevel gears 14, 16 by rotating a rotary shaft 8, and a screw shaft for hanging over 11 and a screw shaft for balance 17 are rotated by the same rotation. Thereby a slider 13 and a counter weight 18 are moved in the directions opposite to each other along the radial by the same amount. Thereby the unbalanced force by the hanging over mechanism part 1 at the hanging over position of a blade 12, is completely balanced by the balance adjusting mechanism part 2. As the result of the same, the unbalance force does not act on the main shaft side at all.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push-out spindle used in a machine tool or the like, and more particularly to a push-out spindle structure with a balance adjusting mechanism including a push-out mechanism section and a mechanism section for balance adjustment.

[0002]

2. Description of the Related Art A machine tool or the like is widely used in a machine tool or the like, which has a push-out mechanism portion for holding an edged edge of a main spindle in a radial direction orthogonal to an axis and for machining an inner hole of a workpiece by the edged edge. in use. FIG. 5 shows an example of the schematic structure. That is, the main shaft 50 is pivotally supported by the quill 30, and the rotary shaft 80 is pivotally supported in the main shaft 50. A bevel gear 90 is fixed to the tip end side of the rotary shaft 80 in the drawing. On the other hand, a case 60 that is connected to the main shaft 50 accommodates a screw shaft 110 that is arranged in a radial direction orthogonal to the axis, and the bevel gear 14 that meshes with the bevel gear 90 is housed in the screw shaft 110.
0 is fixed. On the other hand, the slider 130 slidably supported by the case 60 along the radial direction forms a nut portion 150 that is screwed to the screw shaft 110. The blade 12 is fixed to the slider 130. The slider 130 is supported by the case 60 via a seal member 160.

With the above structure, the screw shaft 110 is rotated through the bevel gears 90 and 140 by rotating the rotary shaft 80 by a drive means (not shown), and the disk-shaped slider 130 screwed to the screw shaft 110 is pitched with the screw shaft 110. Alternatively, the blade 12 is moved in the radial direction along the lead and the blade 12 is pushed out.

[0004]

Although the pushing-out mechanism shown in FIG. 5 allows the blade to be pushed out smoothly, it has the following problems. That is, as illustrated, the case 60
Inside the screw shaft 11 in the right direction around the rotary shaft 80.
0 and a disk-shaped slider 130 that is screwed to this, and the blade 12 fixed to the slider 130 are arranged. Therefore, the unbalance with respect to the rotating shaft 80 is caused by this amount. The case 60 rotates together with the main shaft 50, and the unbalanced components described above are also rotated by the rotation of the main shaft 50 in that state. Therefore, an unbalanced force acts on the main shaft 50, and an unreasonable force acts on a portion pivotally supporting the main shaft 50. As a result, there is a problem that the rotation speed of the spindle 50 cannot be increased to some extent and high-speed machining cannot be performed. In addition, the unbalanced force adversely affects the processed surface,
There is also a problem that a highly accurate machined surface cannot be obtained. Further, there is a problem that the life of the blade 12 is shortened.

The present invention solves the above problems and reduces the above-mentioned unbalance force, enables high-speed machining to improve machining efficiency, and enables high-precision machining.
It is an object of the present invention to provide a protruding main spindle structure with a balance adjusting mechanism that can improve the life of a blade or a member around the main spindle.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a main shaft pivotally supported by a quill, a rotary shaft for protruding a blade pivotally supported in the main shaft, and a rotation of the rotary shaft. A protrusion main shaft structure having a protrusion mechanism unit for moving a blade along a radial direction orthogonal to the axis line, and a balance adjustment balanced with the protrusion mechanism unit at a symmetrical position of the protrusion mechanism unit about the rotation axis. A mechanism section is arranged, and the balance adjustment mechanism section constitutes a protrusion main spindle structure with a balance adjustment mechanism that moves along the radial direction in synchronization with the protrusion mechanism section by rotation of the rotary shaft. More specifically, the pushing-out mechanism section includes a bevel gear that meshes with a bevel gear formed on the rotating shaft side, a pushing-out screw shaft that is connected to the bevel gear and is arranged along the radial direction, A slider that is slidably supported on the protruding main shaft side so as to be screwed onto a screw shaft and move along the radial direction, and that holds the blade; A bevel gear that meshes with a bevel gear, a balancing screw shaft that is connected to the bevel gear and is arranged along the radial direction, and a balance screw shaft that meshes with the screw shaft and moves in the radial direction opposite to the slider. It is characterized by comprising a counter weight. Further, the projecting screw shaft and the balancing screw shaft have different screw pitches or leads, and the bevel gear of the projecting mechanism unit and the bevel gear of the balance adjusting mechanism unit have different numbers of teeth. The bevel gear and the pushing screw shaft of the pushing mechanism unit and the bevel gear and the balancing screw shaft of the balance adjusting mechanism unit have the same or different gears, and the screw pitch or lead is the same or different. What is done is what is selectively used.

A balance adjusting mechanism section is provided at a position symmetrical with the pushing mechanism section for pushing out the blade about the rotation axis, and the balance adjusting mechanism section is provided in synchronization with the pushing mechanism section. Move in the direction of the protrusion to keep the balance at all times. As a result, the unbalanced force acting on the main shaft is reduced. In addition,
The balance adjusting mechanism portion may be any one as long as it reduces the unbalanced force by the protruding mechanism portion, and does not necessarily have the same structure as the protruding mechanism portion. That is, the purpose can be achieved as long as it has a structure capable of making the unbalance moment and the unbalance force acting around the rotation axis substantially the same.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a protruding main spindle structure with a balance adjusting mechanism of the present invention will be described in detail below with reference to the drawings. 1 and 2 show an example thereof. 1 and 2, the right side is the protrusion mechanism section 1 on the right side of the rotary shaft 8 and the left side is the balance adjustment mechanism section 2, which are arranged at symmetrical positions. In this example, both have substantially the same structure. In this case, a tool 12 (shown by a chain double-dashed line) may be attached to the balance adjusting mechanism 2 side to enable rough finishing. Alternatively, another object having the same shape and weight as the blade 12 may be provided in the balance adjusting mechanism 2.

A main shaft 5 is pivotally supported by a bearing 4 on the quill 3. A circular case 6 is connected to the upper side of the main shaft 5 in the figure as shown in FIG. A rotating shaft 8 is pivotally supported inside the main shaft 5 by bearings 7 and the like. The main shaft 5 and the rotary shaft are drive-controlled independently or in synchronization by drive means (not shown). A bevel gear 9 is provided above the rotary shaft 8 in the figure.

The push-out mechanism 1 includes a bearing 1 in a case 6.
The protruding screw shaft 11 and the blade 12 which are pivotally supported by 0 etc.
The slider 13 and the like for holding the. That is, the protruding screw shaft 11 is housed in the case 6 and arranged along the radial direction orthogonal to the axis of the rotary shaft 8. The protruding screw shaft 11 is constrained from moving in the radial direction, and the case 6
Supported by the side. A bevel gear 14 that meshes with the bevel gear 9 of the rotating shaft 8 is formed on the protruding screw shaft 11. Further, for example, a screw having an appropriate pitch or lead is threaded on the protruding screw shaft 11. In addition, it is desirable to use, for example, a ball screw or the like in order to reduce frictional resistance of the screw.

On the other hand, a nut member 15 is screwed into the screw of the protruding screw shaft 11, and the nut member 15 is fixed to the slider 13. The slider 13 is supported by the case 6 slidably in the radial direction. The blade 12 is detachably supported by the slider 13 so as to project in the radial direction. With the above-described structure, when the rotating shaft 8 is rotated, the protruding screw shaft 11 is rotated via the bevel gear 9 and the bevel gear 14, and the nut member 15 and the slider 13 that are screwed to the screw shaft 11 are the screws of the protruding screw shaft 11. The blade 12 is moved in the radial direction according to the pitch or the lead and the blade 12 is pushed out.

Next, the balance adjusting mechanism 2 will be described.
The balance adjusting mechanism 2 includes a balance screw shaft 17 having a bevel gear 16, a counterweight 18, and the like. The balancing screw shaft 17 is arranged along the radial direction at a position opposed to the protruding screw shaft 11 and is housed in the case 6. The bearing 6 is supported by the bearing 19 and is supported in the case 6 while being restrained from moving in the radial direction. The bevel gear 16 formed on the balance screw shaft 17 is the rotating shaft 8
Mesh with. Further, the thread of the balance screw shaft 17 is formed of a screw opposite to the screw of the protruding screw shaft 11.

The counterweight 18 comprises a nut member 20 which is screwed onto the screw of the balancing screw shaft 17. By rotating the rotary shaft 8 with the above structure, the balance screw shaft 17 rotates via the bevel gear 9 and the bevel gear 16, and the counterweight 18 that is screwed into the balance screw shaft 17 is rotated.
Moves in the radial direction along the balancing screw shaft 17.
Since the protruding screw shaft 11 and the balance screw shaft 17 rotate in opposite directions, the slider 13 and the counterweight 18 move in opposite directions.

In the embodiment shown in FIGS. 1 and 2, the bevel gear 14 and the bevel gear 16 have the same shape, and the protruding screw shaft 11 and the balancing screw shaft 17 are the same except for the left and right screws. The slider 13 having the blade 12 and the counterweight 18 are formed in the same shape. As described above, by rotating the rotary shaft 8, the rotation of the bevel gear 9 is controlled by the rotation of both bevel gears 14,
16 and the screw shaft 11 for protrusion and the screw shaft 17 for balance are rotated at the same rotation. This allows
The slider 13 and the counterweight 18 move in opposite directions along the radial direction by the same amount. As described above, the unbalanced force of the protrusion mechanism unit 1 is perfectly balanced by the balance adjustment mechanism unit 2 at the protrusion position of the blade 12. As a result, no unbalanced force acts on the spindle 5 side. As a result, the spindle 5 can be machined at high speed, the adverse effect on the machined surface is eliminated, and high precision machining can be performed. Further, the service life of the blade 12 and the members around the main shaft 5 and the rotary shaft 8 can be improved.

FIG. 3 shows another embodiment of the protruding main spindle structure with the balance adjusting mechanism of the present invention. In the case of this example, the screw pitch (lead) of the protrusion screw shaft 11a of the protrusion mechanism portion 1a and the screw pitch (lead) of the balance screw shaft 17a of the balance adjustment mechanism portion 2a are different, and are not shown. The case where the screw pitch of the balance adjusting mechanism 2a is formed finely is shown. In this case, the bevel gears 14a and 16a meshing with the bevel gear 9 of the rotating shaft have the same shape. Further, the counterweight 18a is formed heavier than the slider 13a having the blade 12a by an amount corresponding to the difference in screw pitch. In this example, the rotary shaft 8
Rotating the bevel gears 14a and 16a at the same number of rotations, the slider 13a and the counterweight 18
The amount of movement of a is different by the difference in screw pitch. In this example, the counterweight 18a has a smaller movement amount than the slider 13a. However, since the counterweight 18a is heavy due to the small amount of movement, the moment with respect to the rotating shaft 8 is the same and balanced. Of course,
When the centrifugal force is taken into consideration, it is a function of the square of the radius from the center of the rotating shaft 8. Therefore, the balance can be maintained by making the weight of the counterweight 18a commensurate with it. From the above, the protruding screw shaft 11a
And the weight of the slider 13a and the screw pitch of the balancing screw shaft 17a and the counterweight 18
It becomes possible to maintain the balance around the rotating shaft 8 even if the weight of a and the like differ.

FIG. 4 shows still another embodiment of the present invention. In this case, the bevel gear 14b of the push-out mechanism 1b and the bevel gear 16b of the balance adjustment mechanism 2b have different numbers of teeth, and the screw pitch of the push-out screw shaft 11b and the screw of the balance screw shaft 17b are different from each other. The pitch is different. Further, the slider 13b and the counterweight 18b have the same weight or different weights. Also in the case of this example, the unbalanced force around the rotary shaft 8 can be canceled by selecting the dimensions and weights of the respective components in association with each other.

In the above description, the case where one slider 13 and one counterweight are arranged has been described, but the present invention is not limited to this. Further, although the material of the counterweight 18 is not mentioned, it is also possible to apply a different material as one means for balancing.

[0018]

【The invention's effect】

1) According to the protruding main spindle structure with a balance adjusting mechanism of claim 1 of the present invention, the protruding mechanism portion and the balance adjusting mechanism portion for protruding the blade are arranged in symmetrical positions, and the protruding portion is a component of the balance adjusting mechanism portion. By setting so as to balance with the mechanism section, there is no imbalance around the rotation axis, and it becomes possible to rotate the spindle at high speed.
Therefore, the machining efficiency can be improved, and the unbalanced force is not adversely affected, and high-precision machining can be performed. Further, the load on the blades, bearings, etc. can be reduced, and the service life thereof can be improved. 2) According to the protruding spindle structure with the balance adjusting mechanism of claim 2 of the present invention, since the slider and the counterweight move in opposite directions along the respective screw shafts due to the rotation of the rotating shaft, the rotating shaft is constituted. The balance can be automatically adjusted when the blade is pushed out by the rotation of. That is, balancing is performed automatically and reliably. 3) According to the protruding main spindle structure with balance adjusting mechanism of claims 3 to 5, the rotation is transmitted to the pitch of the protruding screw shaft of the protruding mechanism portion and the balance screw shaft of the balance adjusting mechanism portion and to each of them. By appropriately and selectively setting the number of teeth of the bevel gears and the weights of the slider and the counterweight, it is possible to obtain a desired combination capable of balancing. This makes it possible to select each balancing component according to the spindle structure. That is, the degree of freedom in selection is high, and the effect of being easy to implement can be enhanced. 4) According to the protruding main spindle structure with the balance adjusting mechanism of the sixth aspect of the present invention, the counterweight is slidably supported on the main spindle side, so that the countweight can be accurately moved and balanced. The certainty of is improved.

[Brief description of drawings]

FIG. 1 is an axial cross-sectional view showing the overall structure of an embodiment of a protruding main shaft structure with a balance adjusting mechanism of the present invention.

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a schematic view showing another embodiment of the protruding spindle structure with the balance adjusting mechanism of the present invention.

FIG. 4 is a schematic view showing still another embodiment of the protruding main spindle structure with the balance adjusting mechanism of the present invention.

FIG. 5 is a partial axial sectional view showing a schematic structure of a conventional push-out mechanism section.

[Explanation of symbols]

 1 protruding mechanism 1a protruding mechanism 1b protruding mechanism 2 balance adjusting mechanism 2a balance adjusting mechanism 2b balance adjusting mechanism 3 quill 4 bearing 5 main shaft 6 case 7 bearing 8 rotating shaft 9 bevel gear 10 bearing 11 screw screw shaft for protruding 11a Screw-out shaft for protrusion 11b Screw-out shaft for protrusion 12 Blade 13 Slider 13a Slider 13b Slider 14 Bevel gear 14a Bevel gear 14b Bevel gear 15 Nut member 16 Bevel gear 16a Bevel gear 16b Bevel gear 17 Balance screw shaft 17a Balance screw shaft 17b Balancing screw shaft 18 Counterweight 18a Counterweight 18b Counterweight 19 Bearing 20 Nut member

Claims (6)

[Claims] 1. A main shaft pivotally supported by a quill, a rotary shaft for protruding a blade pivotally supported in the main shaft, and a push-out mechanism portion for moving the blade along a radial direction orthogonal to the axis by rotation of the rotary shaft. In the protruding main shaft structure having, a balance adjusting mechanism part that is balanced with the protruding mechanism part is arranged at a symmetrical position of the protruding mechanism part about the rotating shaft, and the balance adjusting mechanism part is A protruding main spindle structure with a balance adjusting mechanism, which moves in the radial direction in synchronization with the protruding mechanism portion by rotation. 2. The push-out mechanism section, a bevel gear that meshes with a bevel gear formed on the rotary shaft side, a push-out screw shaft that is connected to the bevel gear and is arranged along the radial direction, A slider that is slidably supported on the protruding main shaft side so as to be screwed onto a screw shaft and move along the radial direction, and that holds the blade; A bevel gear that meshes with a bevel gear, a balancing screw shaft that is connected to the bevel gear and is arranged along the radial direction, and a balance screw shaft that meshes with the screw shaft and moves in the radial direction opposite to the slider. The protrusion main spindle structure with a balance adjusting mechanism according to claim 1, comprising a counterweight. 3. The protrusion main shaft structure with a balance adjusting mechanism according to claim 2, wherein the protrusion screw shaft and the balance screw shaft have different screw pitches or leads. 4. A balance adjusting mechanism with a protruding main spindle structure according to claim 2, wherein the bevel gear of the protruding mechanism section and the bevel gear of the balance adjusting mechanism section have different numbers of teeth. 5. The bevel gear and the pushing screw shaft of the pushing mechanism unit and the bevel gear and the balancing screw shaft of the balance adjusting mechanism unit have the same or different gears and the same screw pitch or lead. Alternatively, the protruding main spindle structure with the balance adjusting mechanism according to claim 2, wherein different ones are selectively used. 6. The protruding main spindle structure with a balance adjusting mechanism according to claim 2, wherein the counterweight is slidably supported on the protruding main spindle side.