JPH04360739A - Guide device for movable body - Google Patents

Abstract

PURPOSE:To accurately move a movable body straight even in the case that a guide face 5a as a reference is not flat face in the lengthwise direction between opposed guide faces 4a, 5a of a pair of upper and lower guide members 4, 5. CONSTITUTION:Guide face adjusting mechanisms 9 are provided on a plurality of positions in the lengthwise direction between guide members 4, 5 of which guide faces 4a, 5a guide and support the slide faces 7d, 7e of a movable body 7 through static pressure bearings 8, 8. One guide member 4 is elastically deformed with the guide face adjusting mechanisms 9, the interval between the guide face 4a of the one guide member 4 and the guide face 5a of the other guide member 5 is made symmetrical on both sides of the center line of the interval in the lengthwise direction, and the movable body 7 is moved straight in the lengthwise direction of the interval while keeping the movable body 7 on the center of the interval with the static pressure bearings 8, 8.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide device for a movable body such as a table of a machine tool.

0002

[Prior Art] Fig. 6 shows a conventional general guide device for a movable body.
I will explain about it.

As shown in FIG. 6, this guide device for a movable body includes a fixed guide member 2 provided on a bed 1, and this guide member 2 includes a pair of lateral (left and right) direction guide members 3 and a left guide member 3. , 1 each on the right
The main members are a pair of vertical guide members 4 and 5, and these are fixed.

[0004] A pair of lateral guide members 3 are each fixed on the bed 1 at a mutual interval, and guide surfaces 3a facing the left and right guide members 3 are formed along the longitudinal direction thereof. ing.

Further, regarding the vertical guide members 4 and 5, the lower guide member 5 is arranged on the left and right outer sides of the left and right lateral guide members 3 and also serves as a fixed base, and a spacer 6 is provided on the lower guide member 5. An upper guide member 4 serving as a guide rail is fixed thereto, and opposing guide surfaces 4a and 5a protruding inward in the left-right direction from the spacer 6 of the guide members 4 and 5 are formed along the longitudinal direction thereof.

[0006] A movable body 7 such as a table of a machine tool has
One downward protrusion 7a and two lateral protrusions 7b are formed. The downward protrusion 7a is disposed between the lateral guide members 3, and these guide surfaces 3a and the downward protrusion 7a
The sliding surfaces 7c provided on both side surfaces are slidably opposed to each other. The lateral protrusion 7b is inserted between the opposing guide surfaces 4a, 5a of the upper and lower guide members 4, 5, and slides provided on the guide surfaces 4a, 5a and the upper and lower surfaces of the lateral protrusion 7b The surfaces 7d and 7e are slidably opposed to each other.

[0007] Each guide surface 3a of the guide members 3, 4, 5,
4a, 5a and the respective sliding surfaces 7c, 7d, 7e of the movable body 7
A hydrostatic bearing 8 is provided between the movable body 7 and the movable body 7, which is movable in the longitudinal direction of the fixed guide body 1, that is, in the front-back direction, and guided in the horizontal and vertical directions via the lubricating oil of the hydrostatic bearing 8. Supported.

[0008]

[Problems to be Solved by the Invention] As described above, the conventional guide device for a movable body connects the sliding surface of the movable body between opposing guide surfaces provided on each pair of guide members via a hydrostatic bearing. Since the movable body is guided and supported, the movable body is positioned by the hydrostatic bearing at the center position of each pair of guide members, that is, at a position where the bearing gaps on both sides of the hydrostatic bearing are equal. Therefore, the motion accuracy of the movable body is greatly affected by the shape of the opposing guide surfaces, and if the machining accuracy of the guide surfaces is low or the temperature difference between room temperature and the lubricating oil used in hydrostatic bearings, thermal deformation of the guide surfaces may occur. If this occurs, the straightness of the movable body will be impaired.

That is, as illustrated in FIG. 7, if the guide surface 5a of the lower guide member 5 is not flat, such as by being curved in a convex arc shape with a high central portion in the longitudinal direction, which is the moving direction of the movable body, the upper guide Even if the guide surface 4a of the member 4 is flat, the center of the lateral protrusion 7b of the movable body is aligned with the center line 0 of the interval between the guide surfaces 4a, 5a due to the static pressure bearings 8, 8. Since the movable body moves while maintaining the same, there is a problem in that the movable body does not move straight horizontally, but moves with a convex curve in the vertical direction.

[0010] This invention solves the above-mentioned problems, and
Provided is a guide device for a movable body that can move the movable body in a straight line with high precision even when the guide surface that serves as a reference for the guide member is curved in the longitudinal direction or is not flat due to low precision machining or thermal deformation. The purpose is to

[0011]

[Means for Solving the Problems] The present invention provides the above-mentioned structure in which the sliding surfaces of the movable body are respectively guided and supported via hydrostatic bearings on the opposing guide surfaces provided on the guide members of each pair of the fixed guide bodies. In such a guide device for a movable body, one guide member is elastically deformed at a plurality of locations in the longitudinal direction between a required pair of opposing guide members to form a guide surface of one guide member and a guide surface of the other guide member. A guide surface adjustment mechanism is provided to make the distance between the guide surface and the guide surface symmetrical on both sides of the center line along the longitudinal direction of the distance.

0012

[Operation] The guide device for a movable body according to the present invention elastically deforms one of a required pair of guide members by means of guide surface adjustment mechanisms provided at multiple locations in the longitudinal direction between the required pair of guide members.
This guide surface is made symmetrical to the guide surface which is a non-plane reference such as the other curved guide member and on both sides of the center line of the interval between both guide surfaces.

[0013] Thereby, the movable body can be moved while being kept at the center of the above-mentioned interval by the action of the static pressure bearings provided between both guide surfaces and the movable body.

Therefore, even if the guide surface of the guide member is curved or has low flatness, the movable body can be moved straight with high accuracy.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In FIGS. 1 and 2, the same reference numerals as those in FIG.
, 5, respectively, and is constructed as follows.

That is, in the guide surface adjustment mechanism 9, as shown in FIGS. 3 and 4, a height adjustment block 10 is supported on the upper surface of the outer side of the lower guide member 5, and a height adjustment block 10 is supported on the upper surface 10a of the height adjustment block 10. A slope is provided in which the protrusion height decreases toward the inside. Further, the height adjustment block 10 is provided with a plurality of elongated holes 10b that pass through the block in the vertical direction and are long in the front-rear direction.

The lower end of a bracket 11 is fixed to the outer surface of the lower guide member 5 directly below the height adjustment block 10, and the upper end of the bracket 11 has a horizontal adjustment screw 12 extending in the left-right direction. It is supported through the shaft, restricting movement forward and backward, and allowing rotation around the axis. The inner end of the adjustment screw 12 is screwed into the height adjustment block 10, and the outer end of the adjustment screw 12 protruding outside the bracket 11 is fitted with a lock nut 1.
3 are screwed together.

A support block 14 is fixed to the lower surface of the outer side of the upper guide member 4 by a plurality of mounting bolts 15, and a guide groove 14a is formed along the left-right direction on the lower surface of the support block 14, and a height adjustment mechanism is formed in the guide groove 14a. The upper part of the block 10 is fitted. The front and rear surfaces of the height adjustment block 10 are guided and supported by the front and rear walls 14b of the guide groove 14a, and the bottom surface 14c of the guide groove 14a is provided with an inclination that increases the protrusion height toward the inside. The upper surface 10a of the height adjustment block 10 is closely supported by the groove bottom surface 14c so as to be slidable in the left-right direction.

The tightening bolts 16 passed through the plurality of round holes 4b and 14d provided in the upper guide member 4 and the support block 14 are also passed through the long holes 10b of the height adjustment block 10. The threaded end of the tightening bolt 15 is screwed into the screw hole 5b of the lower guide member 5, and the head of the tightening bolt 16 is supported by the step 14e provided in the round hole 14d of the support block 14. The upper guide member 4 is a support block 14
The lower guide member 5 is tightened and fixed using the height adjustment block 10 as a spacer.

Guide surface adjustment mechanism 9 configured as described above
In this case, with the tightening bolt 16 slightly loosened and the lock nut 13 loosened, a tool is applied to the head of the adjustment screw 12 and the screw 12 is rotated to perform the adjustment operation.

By this operation, the height adjustment block 10
moves the upper surface of the lower guide member 4 in the left-right (inside and out) direction and moves the height adjustment block 10 to the left in FIG. The distance between the guide member 5 and the guide surface 5a becomes narrower. Conversely, when the height adjustment block 10 is moved to the right in FIG. 3, the upper guide member 4 rises, and the guide surface 4a of the upper guide member 4 and the lower guide member 5
The distance between the guide surface 5a and the guide surface 5a becomes wider.

One guide surface adjustment mechanism 10 has been described above, but as shown in FIG. 2, the guide surface adjustment mechanism 10 extends over the entire longitudinal length of the upper and lower guide members 4 and 5.
A large number of them are arranged at predetermined intervals.

As illustrated in FIG. 5, when the guide surface 5a of the lower guide member 5 is curved in a high convex arc shape at the center in the longitudinal (front and rear) direction, which is the moving direction of the movable body, , a guide surface 4a formed on the opposing surfaces of the lower guide members 4 and 5,
The guide surface adjustment mechanism 10 is arranged so that the interval between the spaces 5a and 5a is symmetrical in the upper and lower directions along the longitudinal direction with respect to the center line 0 of this interval.
Adjust by.

That is, by the above-mentioned adjustment operation of each guide surface adjusting mechanism 10, the distance is narrowed by a large amount at the center in the longitudinal direction and by a small amount at both ends. After that, rotate the lock nut 13 using a tool, and
1 prevents the adjustment screw 12 from rotating inadvertently. Furthermore, after that, the slightly loosened tightening bolt 16 is fully tightened, and the upper guide member 4 is elastically deformed, so that the guide surface 4a of the lower guide member 5 is changed to the guide surface 5a of the lower guide member 5.
and curve it into a symmetrical convex arc shape.

As described above, the shapes of the guide surfaces 4a, 5a of the upper and lower guide members 4, 5 on both the left and right sides are shaped along the longitudinal direction with respect to the center line 0 located on the same horizontal plane between these. By making each vertically symmetrical, the sliding surfaces 7d and 7e provided on both upper and lower sides of the lateral protrusion 7b of the movable body 7
Static pressure bearings 8, 8 are provided on the guide surfaces 4a, 5a facing the lateral direction protrusion 7b of the movable body 7, and
Since the movable body 7 works to maintain the center of the distance between the guide surfaces 4a and 5a of the lower guide members 4 and 5, the movable body 7 moves straight horizontally with high precision.

The above explanation has been made regarding the case where the guide surface 5a of the lower guide member 5 serving as a reference is curved in a convex arc shape.
Even if the guide surface is curved in a concave arc shape or wave shape, the above-mentioned problem can be achieved by elastically deforming the upper guide member and adjusting the guide surface so that both sides of the center line of the upper and lower guide members are symmetrical. As in the case, the movable body can be moved straight with high precision.

The configuration of this embodiment other than those described above is the same as that of the conventional guide device shown in FIG.

Furthermore, the present invention does not require fixing a support block as a separate member to the upper guide member as in the above embodiment.
A support block may be integrally projected from the lower surface of the upper guide member.

Furthermore, the present invention can be applied to one of the lateral guide members, and by adjusting the guide surface of the guide surface to be symmetrical with the guide surface of the other lateral guide member, the movable body can be moved in the left-right direction. It can move straight with high precision.

[0031]

Effects of the Invention As explained above, the present invention provides a movable structure in which a sliding body of a movable body is guided and supported via a hydrostatic bearing on the opposing guide surfaces provided on each pair of guide members of a fixed guide body. In a body guiding device, one guide member is elastically deformed at multiple locations in the longitudinal direction between a required pair of opposing guide members to improve the distance between the guide surface of one guide member and the guide surface of the other guide member. Since the guide surface adjustment mechanism is provided symmetrically on both sides of the center line along the longitudinal direction of this interval, the following effects can be obtained.

The guiding device for a movable body according to the present invention elastically deforms one of the required pairs of guide members by means of guide surface adjustment mechanisms provided at a plurality of locations in the longitudinal direction between the required pairs of guide members. is made symmetrical to the guide surface that is a non-plane reference such as the other curved guide member, and to both sides of the center line of the interval between both guide surfaces.

[0033] Thereby, the movable body can be moved while being kept at the center of the interval by the action of the static pressure bearings provided between both guide surfaces and the movable body.

Therefore, even if the guide surface of the guide member is curved or has low flatness, the movable body can be moved in a straight line with high accuracy, and therefore the machining accuracy of the guide surface does not have to be very high. Since there is almost no need to take measures against thermal deformation of the guide member, it is possible to provide a guide device for a movable body at a low cost.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing a movable body guiding device according to an embodiment of the present invention.

[Fig. 2] Partial side view in the direction of arrow A in Fig. 1

[Figure 3] Enlarged partial view of part B in Figure 1

[Fig. 4] Cross-sectional view taken along line C-C in Fig. 3

[Fig. 5] A longitudinal sectional view for explaining the operation of the vertical guide member of the guide device shown in Fig. 1.

[Fig. 6] A schematic cross-sectional view showing a conventional movable body guiding device.

[Fig. 7] A longitudinal cross-sectional view for explaining deformation of the vertical guide member of the guide device shown in Fig. 6.

[Explanation of symbols]

1 Bed 2 Fixed guide body 3 Lateral guide member 4, 5 Upper and lower guide members 3a, 4a, 5a Guide surface 7 Movable body 7c, 7d, 7e Sliding surface 8 Static pressure bearing 9 Guide surface adjustment mechanism 10 Height adjustment block 11 Bracket 12 Adjustment screw 13 Lock nut 14 Support block 16 Tightening bolt

Claims (1)

[Claims] Claim 1: A fixed guide body having a plurality of pairs of guide members, each having a guide surface facing each pair of guide members formed along the longitudinal direction, and a fixed guide body having a plurality of pairs of guide members, each of which is slidably slidable on the opposing guide surface of each pair. In a guide device for a movable body, the movable body is guided and supported by the fixed guide body by opposing sliding surfaces, and a static pressure bearing is provided between the guide surface and the sliding surface. By elastically deforming one of the guide members at multiple locations in the longitudinal direction between the guide members, the distance between the guide surface of one guide member and the guide surface of the other guide member is changed to the center of the distance along the longitudinal direction. A guide device for a movable body, characterized in that a guide surface adjustment mechanism is provided to make the guide surface symmetrical on both sides of the line.