JPH01171736A - Inclined table - Google Patents

Abstract

PURPOSE:To obtain a stable and highly accurate table which can stand a lopsided load by making the downside guide of both side guides which are installed parallel to a table axis while being inclined at a defined angle on an installing base, a ball-and-roller bearing and restricting the rotation with respect to the axis by the upside guide. CONSTITUTION:The rail-portion installing faces 14a, 14b of a cross roller guide 13b provided on the lower part of an inclined table are pressed against a table side installing face 15b and a base side installing face 16b within leaving gaps because of the load of the table 11. The roller 17 in the cross roller guide is also pressed without leaving a gap by the rolling faces 18a, 18b in a rail and, since the pressing force is constant, gaps toward the table side installing face 15b and toward the base side installing face 16b can be always kept constant. At this time, an upper cross roller guide 13a can restrict the rotation of the upper part of the table 11 with a bearing portion as a fulcrum by means of the cross roller guide 13b, preventing the rotation with respect to a table axis.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a tilting table used in machine tools and the like.

BACKGROUND OF THE INVENTION Conventionally, tables used in machine tools and the like have had various configurations.

One of them, the structure shown in Fig. 3, is an example of a sliding bearing using V grooves.
The edges 4a and 4b are combined to form a linear guide.

Further, the structure shown in FIG. 4 is an example of a structure using an endless track type rolling bearing. Guide rail 6a on base 5
, 6b are attached, and a table 8 is assembled to a slider 7 that slides on them, thereby forming a linear guide.

Problems to be Solved by the Invention However, in the case of a structure using sliding bearings as shown in Fig. 3, the V grooves 2a, 2b and
The edges 4a and 4b are pressed down by the pressure of the table 3's own weight, so if a force that exceeds the force due to the table's own weight is applied to the table, the table will rise from the base 1 because there is no regulation, and the table 3 There was a problem in that the straightness of the vehicle was impaired. In order to solve this problem, the weight of the table 3 is increased and the V-groove 2a is installed.

2b and the V-edges 4a, 4b could be pressed with a stronger force, but in this case, since a sliding bearing is used, the sliding resistance increases, and this, combined with an increase in table weight and inertia, causes problems in driving. There is also the problem that the force becomes too large.

In addition, when using an infinitely flexible type rolling bearing as shown in FIG.
When installing, press reference surface 9 machined on the base side.
They are attached to the mounting surfaces 10a and 10b with a belt, and the rail itself is usually tightened with a belt.
Even if you try to press the rail against the reference surfaces 9a, 9b with a push plate from the side of the rail, the tightening force and pressing force will be uneven, and the guide rails 6a, 6b will be deformed. There was a problem in that the straightness of the table 8 was impaired by the amount. Furthermore, these track type rolling bearings cause stick-slip and deformation of the slider 7 and guide rails 6a and 6b when the built-in rolling elements move in and out of the rail surface, so deterioration of straightness due to these problems is also a problem. It had become.

Therefore, in view of the above-mentioned problems, the present invention prevents the guide part from floating even when an unbalanced load is applied, reduces the weight of the sliding resistance table of the shaft system, and even reduces the driving force. The present invention provides a table structure that has little deformation, does not cause stick slips, and has a high level of straightness.

Means for Solving the Problems In order to solve the above problems, in the tilting table of the present invention, the plane on which the guide structure is arranged is tilted by a predetermined angle to reduce the table's own weight. A rolling bearing with a finite stroke is used mainly for the guide on the receiving side,
The other guide is configured to restrict rotation of the table with respect to the movement axis.

Effects The effects of adopting the above configuration are as follows. In other words, when a pair of structures serving as guides are arranged at a predetermined angle to a plane to support and guide a table, which is a moving body, one of the guides, mainly the side disposed downward, has a finite rolling stroke. If a bearing is used to support the table's own weight, the rails and moving bodies that make up the guide will be able to move between the table and the base holding it due to the table's own weight, at least for the rolling elements. There is no gap between the intervening parts (they are pressed against each other, and if there is no change in the table's own weight, the amount of deformation will be constant, so the table and base can be guided with the accuracy of the mounting surface of the structure that serves as a guide. As a result, in the present invention, variations in deformation due to parts when applying preload to the guide rail can be reduced by rolling with a uniform load of the table's own weight, and by using rolling bearings with a finite stroke, without the occurrence of stake slip. Since the number of moving bodies does not fluctuate, by applying a stable pressure, the same effect as applying a uniform preload can be obtained, so it can be reduced. There is no slippage, no deformation of the rails or rolling elements, and no deterioration of the straightness of the table.

Furthermore, if the line to the axis of the table is regulated by a guide placed on the other side, it is possible to prevent the lifting of the table due to the unbalanced load mentioned above by using a guide equivalent to that on the side of the load receiver. Or, by using rolling bearings with low resistance for both, it is possible to prevent the table from increasing in weight and lifting up, and to construct a table with low driving force.

Example An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the configuration of a tilting table according to a first embodiment of the present invention, where 11 is a table, 12 is a base, and the table 12 is a cross roller guide 13a, 13b.
It is supported and guided on the base 12 by.

The actual operation of the tilting table configured as described above will be explained. Due to the load of the table 11, the cross roller guide 13b disposed downward in FIG.
, is pressed against the base side mounting surface 16b without any gap. Further, the roller 17 in the cross roller guide also has an in-rail transfer surface 18a.

The table side mounting surface 15b is pressed against the table side mounting surface 15b because the force of the pressing is constant.

The distance between the base side mounting surfaces 16b is always kept constant. At this time, the upper cross roller guide 13a is
It is possible to restrict the rotation of the cross roller 13b above the bearing part as a fulcrum, and as a result, rotation about the table axis is prevented.

Since a cross roller guide is used, the driving resistance is small, and since the rollers, which are rolling elements, do not move in and out of the rolling surface, there is no stick slip and the resulting deformation that causes inferior straightness. There is no variation in deformation depending on the table position due to preload (as a result, it does not affect the straightness of the table. Also, since the upper part is restricted, there is no free direction (,
Can withstand uneven loads. As in this configuration, the above effects can be obtained by arranging the cross roller guide that constitutes the guide at 45° C. and incorporating the table.

FIG. 2 illustrates a second embodiment of the present invention.
The base of the table 20 has the same structure as that shown in the embodiment of FIG. 1 shown in FIG. The difference from the configuration shown in FIG. 1 is the angle of inclination of the table and the type of guide used. In the second embodiment, a ball gate 21 using steel balls as rolling elements is used as the lower guide, and a V-groove sliding bearing 22 is used as the upper rotation regulating guide.

The operation of this embodiment is the same as that of the first embodiment, but the lower guide can be of any type as long as it is a rolling bearing.
This shows that the upper guide does not need to be a rolling bearing as long as its rotation can be regulated, and that the effects of the present invention can be obtained even if the inclination angle is not limited to 45 degrees.

Effects of the Invention As described above, in the present invention, a structure serving as a guide is mounted on the mounting base parallel to the axis of the table and tilted at a predetermined angle, and the lower guide is small (in both cases, it is a rolling bearing with a finite stroke, and By adopting a configuration in which rotation with respect to the table axis is restricted by the - side guide, there is less variation in preload and deterioration of straightness due to the coming and going of rolling elements in the guide part, low driving resistance, and resistance to uneven loads. This allows a stable and highly accurate table to be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a tilting table according to a first embodiment of the present invention, FIG. 2 is a perspective view showing a second embodiment of the present invention,
3 and 4 are perspective views of conventional tables. 11.19...Table, 12.20...
...Base, 13a, 13b...Cross roller guide, 21...Ball guide, 22...
...Sliding bearing. Name of agent: Patent attorney Toshio Nakao and one other person 11-m-
Table 12- Base I3α, 13mu Cross roller γid Fig. 1 1? -Table 20~ Base 21- Ball guide 22- Sliding lees receiver Fig. 2 Fig. 3 Fig. 4

Claims (1)

[Claims] A structure that serves as a guide is mounted on the mounting base with the plane on which it is arranged parallel to the axis and tilted at a predetermined angle, and a finite stroke rolling bearing is used for the guide that mainly receives its own weight, and the other side is A tilting table with a structure that prevents rotation about the axis using guides.