JP3954872B2 - Anti-vibration device for linear guide device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a device for preventing vibration of a moving table guided by a linear guide device having rolling elements such as balls and rollers, and particularly suitable for preventing vibration of a tool post of a machine tool. It relates to the device.
[0002]
[Prior art]
Since machine tools process a workpiece by relative movement between the workpiece and the cutter, when processing a straight line or a flat surface, the cutter must be moved linearly with high accuracy. As a guide device for this linear movement, a sliding guide device by surface contact is generally used, but for the purpose of reducing the movement resistance and increasing the speed, a ball or roller is incorporated. A linear guide device having a rolling structure has been used. However, the linear guide device with a rolling structure has a problem that the vibration damping ability is lower than that of a guide device with a sliding structure, and the surface accuracy of the machined surface tends to be lowered due to vibration during movement.
[0003]
As a vibration isolator for solving this problem, Japanese Patent Application Laid-Open No. 5-1106048 discloses a linear rolling guide device capable of adjusting a gap between a fluid tank and a slider and attenuating vibrations in a plurality of directions. A vibration damping device for a moving body guided by the above has been proposed.
[0004]
As shown in FIG. 3, the structure is such that a column 27 coupled to a bearing 26 of a linear guide device comprising a track 25 fixed to the bed 21 and a bearing 26 slidably supported on the track 25. Is provided with a fluid tank disposed on the bed 21 in parallel with the track 25 and a slider block 22 fixed to the column 27 so that a part thereof is immersed in the fluid tank, and the viscosity supplied to the fluid tank is provided. In the vibration damping device of the column 27 guided by the linear rolling guide device so as to attenuate the vibration of the column 27 by the fluid, the fluid tank is formed with an inclined surface so as to become lower toward the facing surface, and moved. A pair of possible slide bases 23a and 23b are provided, and two inclined surfaces parallel to the inclined surface are formed on the slider block 22.
[0005]
The invention described in this publication provides a vibration damping device for a moving body that is adjustable by a gap between a fluid tank and a slider and is guided by a linear rolling guide device that can attenuate vibrations in a plurality of directions. It is an object. In order to achieve this object, in the apparatus described in the above publication, a plurality of grooves 28 are provided in the slide bases 23a2, 3b at predetermined intervals in the longitudinal direction, and the slide base is screwed to the base with bolts 29 penetrating the grooves 28. is doing. When vibration occurs, the distance between the slide bases 23a and 23b and the slider block 22 is adjusted so that the vibration is reduced. At this time, the opposing gap between one slide base and the slider block is set to attenuate the vertical vibration of the moving body, and the opposing gap between the other slide base and slider block is used to attenuate the longitudinal vibration of the moving body. By setting as described above, vibrations in two directions of the moving body are attenuated.
[0006]
Japanese Patent Laid-Open No. 2001-9655 discloses a linear guide device for a moving table of a machine tool that speeds up an approaching operation and a returning operation and imparts rigidity and vibration damping capability according to machining conditions.
[0007]
As shown in FIG. 4, the apparatus described in this publication includes a guide rail 1 fixed to a frame of a machine tool, and a slider that moves along the guide rail 1 while being fixed to a moving table 4 such as a tool post or a work table. A linear guide device having a rolling element 32 interposed between the sliding portion 31 and a brake shoe for holding the guide rail 1 or a brake rail provided in parallel to the guide rail 1 and the brake shoe 33 is urged toward the rail. The hydraulic cylinder 34 and control means for releasing the hydraulic pressure of the hydraulic cylinder 34 by the high-speed movement command signal of the moving base and supplying hydraulic pressure to the hydraulic cylinder 34 by the cutting movement command signal are provided.
[0008]
In the apparatus shown in FIG. 4, the brake shoe 33 and the hydraulic cylinder 34 are provided in the brake unit attached to the front end surface of the slider 31 in the figure, and the pair of brake shoes 33 are attached to the guide rail 1 or the brake rail. Opposing to be sandwiched from the side.
[0009]
[Problems to be solved by the invention]
However, in the conventional structure shown in FIG. 3, it is necessary to separately provide two slide bases 23a and 23b in addition to the guide rail for guiding the moving table 4. Particularly, when the moving table has a large moving stroke, a highly accurate slide is required. A great amount of work is required to manufacture and adjust the base. Further, although vibrations in the left-right direction and the front-rear direction can be prevented, vibrations in the vertical direction cannot be prevented.
[0010]
Further, in the conventional apparatus shown in FIG. 4, since a hydraulic device for operating the brake shoe is necessary and the moving base moves, it is necessary to use a hydraulic hose for supplying hydraulic pressure. Life is likely to be shortened.
[0011]
Therefore, the present invention has a simpler structure and can be easily and additionally mounted on an existing machine. Further, the present invention can effectively prevent vibrations of the left and right, front and rear, and up and down of the moving base. It is an object to obtain a vibration isolator for a guide device.
[0012]
[Means for Solving the Problems]
The vibration isolator of the present invention is a vibration isolator that is mounted on a movable table 4 that is guided by a guide rail 1 and moves linearly by a linear guide device that incorporates rolling elements that roll between a fixed member and a movable member. is there. The anti-vibration device of the present invention is formed on a bracket 6 that is mounted on a movable table 4 so that the position of the guide rail 1 can be adjusted in the direction perpendicular to the surface of the guide rail 1, an anti-vibration slider 8 that is fixed to the bracket, and the anti-vibration slider. A sliding groove 10 that is slidably fitted to the guide rail 1, an adjustment block 11 that forms one of the opposing surfaces of the sliding groove, and an adjustment screw 15 that sets the position of the adjustment block. And both the opposite side surfaces and the bottom surface of the sliding groove 10 are composite resin surfaces that are in sliding contact with the guide rail 1.
[0013]
The composite resin surface is particularly preferably a fluororesin resin surface containing gunmetal as a composite material. The vibration isolator of the present invention is suitable as a vibration isolator for a moving table of a machine tool, and particularly suitable for a vibration isolator for a tool post slide and a moving spindle stock slide.
[0014]
In the vibration isolator having the above structure, the positional relationship between the vibration isolating slider 8 and the guide rail 1 can be easily adjusted by adjusting the mounting position of the bracket 6, and one of the opposing sliding surfaces is adjusted with the adjusting screw 15. Therefore, the adjustment screw 15 can easily adjust the distance between the sliding surfaces facing each other in accordance with the width of the guide rail 1. And since the sliding surface of the anti-vibration slider 8 contacts the guide rail 1 from the upper and left and right directions, and the sliding surface is a resin surface, a large vibration damping capability is given in the left and right and up and down directions. Can do. Further, the longitudinal direction of the movable table 4 can be absorbed by the viscosity in the shear direction of the lubricating oil by supplying the lubricating oil between the guide rail 1 and the sliding surface of the vibration-proof slider 8. Furthermore, by using a resin surface containing a composite material such as gunmetal as the material of the sliding surface of the vibration-proof slider, the movement resistance when the moving table 4 moves at high speed can be reduced.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. The figure shows an example in which the vibration isolator of the present invention is provided on a tool post slide of a lathe. In the figure, reference numeral 1 denotes a guide rail fixed to a fixed side member (frame or lower moving table) 2, which is fixed in parallel to both sides of the groove 3 on the upper surface of the fixed side member 2. Reference numeral 4 denotes a moving table (turret slide), and the lower surfaces of both side edges are guided to the guide rail 1 by a linear guide device having a rolling structure (not shown). A cylindrical groove 5 is provided at the center of the lower surface of the movable table 4 so as to protrude downward, and a nut member screwed into a feed screw disposed in the concave groove 3 of the fixed side member is provided in the cylindrical groove 5 portion. Inserted.
[0016]
A bracket 6 shown in FIG. 2 is fixed with bolts 7 on the end surfaces of the movable table 4 above the rails 1 on both sides. The bracket 6 is L-shaped when viewed from the side, and a vibration-proof slider 8 is fixed to the lower surface of the bracket 6 with four bolts 9. The anti-vibration slider 8 has a downward U-shaped cross section, and is provided with a sliding groove 10 fitted to the guide rail 1 on the lower surface. An adjustment block 11 is mounted on one side wall of the sliding groove 10, and two guide holes 12 and screw holes 13 in the direction of sandwiching the guide rail 1 are provided behind the adjustment block 11. The adjustment block 11 has a rectangular plate shape, and two guide pins 14 are planted on the back surface thereof, and the guide pins are mounted in a state in which the guide pins are slidably fitted into the guide holes 12 of the vibration-proof slider. . A hexagon socket head screw 15 is screwed into the screw hole 13.
[0017]
Fluororesin plates 16a, 16b and 16c containing gunmetal as a composite material are attached to both side surfaces (non-moving side and adjustment block) and bottom surface of the sliding groove 10.
[0018]
The anti-vibration device configured as described above adjusts the parallelism between the guide rail 1 and the sliding groove 10 at the fastening portion between the anti-vibration slider 8 and the bracket 6 when the anti-vibration device is attached to the movable table 4. The sliding gap between the bottom surface of the sliding groove 10 and the non-moving side surface and the guide rail 1 can be adjusted at the fastening portion between the guide rail 1 and the movable table 4. And the space | interval of the sliding surface and guide rail 1 which opposes the width direction can be adjusted by pushing the adjustment block 11 with the hexagon socket head screw 15. FIG. The anti-vibration device mounted in this manner moves in a state where both side surfaces and the upper surface of the guide rail 1 are in surface contact with the sliding surface of the composite resin, and the vibration generated in the movable table 4 during this movement. Absorb.
[0019]
【The invention's effect】
The above-described vibration isolator of the linear guide device according to the present invention has a simple structure and is easy to manufacture, and does not require assembling and adjustment, and effectively prevents vibration of the movable table in the vertical and horizontal directions and in the front-rear direction. can do. Furthermore, there is an effect that the resistance at the time of moving the moving table at a high speed is small and it can be easily mounted on an existing apparatus.
[Brief description of the drawings]
FIG. 1 is a partially sectional front view showing a state in which the vibration isolator of the present invention is attached to a moving table. FIG. 2 is a developed perspective view of the vibration isolator of FIG. FIG. 4 is a partial sectional front view of another conventional apparatus.
1 Guide rail 4 Moving base 6 Bracket 8 Anti-vibration slider
10 Sliding groove
11 Adjustment block
15 Hexagon socket head screw

Claims (3)

A vibration isolator that is mounted on a movable table (4) that is guided by a guide rail (1) and moves linearly with a linear guide device that incorporates rolling elements that roll between a fixed member and a movable member, A bracket (6) that is mounted on a movable base so that the position of the guide rail can be adjusted in a direction perpendicular to the surface of the guide rail, a vibration-proof slider (8) fixed to the bracket, and a vibration-proof slider formed on the guide rail. A sliding groove (10) that fits slidably, an adjustment block (11) that forms one of the opposing surfaces of the sliding groove, and an adjustment screw (15) that sets the position of the adjustment block; An anti-vibration device for a linear guide device, characterized in that both opposing side surfaces and the bottom surface of the sliding groove are composite resin surfaces in sliding contact with the guide rail (1). The vibration isolator according to claim 1, wherein the composite resin surface is a resin surface of a fluororesin containing gunmetal as a composite material. The vibration isolator according to claim 1 or 2, wherein the moving table is a tool post slide or a moving head stock slide of a machine tool.

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