JP2000280130A - Static pressure sliding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a static pressure sliding device capable of downsizing the whole device and simplifying the whole device structure without the need for a dedicated arresting gear for a work table. SOLUTION: A work table 11 consists of a guide rail 21 serving as a guide member and a moving table 22 serving as a moving member. When the directional control valve 52 of a pressure oil supply source 12 is at a position I, pressure oil 31 is supplied to static pressure pockets 30a, 30b, and is kept in a first state, and the moving table 22 is movable for the guide rail 21. The directional control valve 52 is switched to a II position, and a second circuit 32b is kept in an atmospheric state through a drain circuit 32c. The pressure oil 31 is supplied to only the static pressure pocket 30a without being supplied to the static pressure pocket 30b, and is kept in a second state, an the moving table 22 is brought into close contact with the guide member 21, thereby arresting the moving table 22 for the guide rail 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydrostatic sliding device for a machine tool.

[0002]

2. Description of the Related Art Conventionally, for example, in a work table apparatus applied to a grinding machine, a linear guide rail is provided on the machine base, and the work table is guided and supported by the guide rail. Then, the lubricating oil is supplied between the sliding surfaces of the guide rail and the work table, and an oil film is formed between the sliding surfaces, so that sliding friction resistance between the two is reduced. Therefore, high-speed feeding is possible when the work table moves. On the other hand, when stopping the work table and grinding the work on the work table,
A work table clamping device using a clamp cylinder or the like for restraining the work table has been provided.

[0003]

However, in the conventional configuration, it is necessary to provide a work table clamping device provided with a dedicated clamp cylinder as means for clamping the work table. For this reason, there has been a problem that the size of the entire apparatus is increased and the configuration is complicated.

[0004] The present invention has been made by focusing on the problems existing in the prior art as described above. It is an object of the present invention to provide a hydrostatic sliding device that does not require a dedicated restraint device, can reduce the size of the entire device, and can simplify the configuration.

[0005]

In order to achieve the above-mentioned object, the invention according to claim 1 is provided by way of at least a pair of parallel static pressure sliding surfaces provided around a guide member.
In a hydrostatic sliding device having a moving member movable on the guide member, a first state in which pressure oil is supplied to both surfaces of the hydrostatic sliding surface of the guide member, and one of the hydrostatic sliding surfaces And a switching means for switching to a second state in which the supply of the pressure oil to the other static pressure sliding surface is stopped.

Therefore, by switching the hydrostatic sliding device from the first state to the second state by the switching means, a dedicated restraint device for the moving member is not provided.
The configuration of the entire hydrostatic sliding device can be simplified.

According to a second aspect of the present invention, in the first aspect, a plurality of pairs of static pressure sliding surfaces are provided. Therefore, the total contact area between the moving member and the static pressure sliding surface is increased, and the moving member can be firmly restrained by the guide member.

According to a third aspect of the present invention, in the first or second aspect, the switching means is a switching valve provided in a pressure oil supply circuit for a static pressure sliding surface. I have.

Therefore, the static pressure sliding device can be easily switched from the first state to the second state by the switching valve. Further, the switching valve of the conventional lubricating oil supply circuit for the static pressure sliding surface may be configured to be capable of switching between the first and second states.

According to a fourth aspect of the present invention, in the first aspect, in the second state, the static pressure sliding surface on the side where the supply of the pressure oil is stopped is large. The gist is to be at atmospheric pressure.

Therefore, in the second state, it is possible to reliably remove excess lubricating oil from the static pressure sliding surface on the side where the supply of pressure oil is stopped, and to bring the moving member into close contact with the static pressure sliding surface. it can.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a work table device applied to a grinding machine or the like will be described in detail with reference to FIGS.

As shown in FIG. 1, a work table device 1
1 includes a guide rail 21 as a guide member and a moving table 22 as a moving member.
The moving table 22 linearly slides back and forth along the guide rail 21 in a direction perpendicular to the plane of FIG. On the moving table 22, for example, a work is mounted, and as the moving table 22 moves, predetermined processing is performed on the work by a tool at a fixed position.

The guide rail 21 has a groove 23 extending in the moving direction of the moving table 22 and includes three guide projections 24-26, which extend in the longitudinal direction of the groove 23. Guide protrusion 24 and guide protrusion 25
Are protruded inward and horizontally from both sides of the upper end of the groove 23. On the other hand, the guide projection 26 projects upward and vertically from the center of the bottom surface of the groove 23.

Guide recesses 27 to 29 are formed on the moving table 22 at positions corresponding to the three guide projections 24 to 26, respectively. The guide projections 24 to 26 have static pressure sliding surfaces 24 a to 24 respectively.
c, 25a to 25c and 26a to 26c are formed. The guide recesses 27 to 29 have static pressure sliding surfaces 27a to 27c and 28a to 28 parallel to the static pressure sliding surfaces 24a to 24c, 25a to 25c, and 26a to 26c, respectively.
c, 29a to 29c are formed. Those static pressure sliding surfaces 24a to 24c, 25a to 25c, 26a to 26
c, 27a-27c, 28a-28c, 29a-29c
The moving table 22 is supported by the guide rail 21 via the. Also, the static pressure sliding surfaces 24a, 24b, 25a,
25b, 26c, 27a, 27b, 28a, 28b, 2
9c are formed in parallel with each other, and the static pressure sliding surfaces 24c, 25
c, 26a, 26b, 27c, 28c, 29a, 29b
Are parallel to each other and the static pressure sliding surfaces 24a, 24b,
25a, 25b, 26c, 27a, 27b, 28a, 2
8b and 29c are at right angles. Further, static pressure pockets 30a and 30b are respectively formed at predetermined positions on the static pressure sliding surfaces 27a to 29a and 27b to 29b.

The static pressure pockets 30a and 30b are connected to a pressure oil supply source 12 for supplying a pressure oil 31 via first and second circuits 32a and 32b of different systems. That is, there are two systems, a first circuit 32a for supplying pressure oil to the static pressure pocket 30a and a second circuit 32b for supplying pressure oil to the static pressure pocket 30b. First circuit 3
2a is the lower surface of the guide recesses 27 and 28 and the guide recess 2
The pressure oil 31 is supplied to the static pressure pockets 30a formed on the side surfaces of the guide recesses 28 on the side of the guide recesses 9 respectively. Second circuit 32b
Supplies the pressurized oil 31 to the static pressure pockets 30b formed on the upper surfaces of the guide recesses 27 and 28 and on the side surface of the guide recess 29 on the guide recess 27 side. The pressure oil 31 squirted from each of the static pressure pockets 30a and 30b is recovered through a recovery path (not shown) via the groove 23, and is returned to the lubricating oil tank 53.

The first circuit 32a is connected to the discharge side of the pressure oil pump 51. The second circuit 32b includes the first circuit 32
A branch is made from a, and a solenoid-driven directional switching valve 52 is connected in the middle of the branch. 32c indicates a drain circuit. When the direction switching valve 52 is switched to the position I, the pressure oil 31 is supplied to both the static pressure pocket 30a and the static pressure pocket 30b. When the direction switching valve 52 is switched to the position II, the pressure oil 31 is supplied only to one of the static pressure pockets 30a, and the static pressure pocket 30b is brought into the atmospheric pressure state via the drain circuit 32c.

Here, the operation of the moving table 22 reciprocating linearly with respect to the guide rail 21 will be described with reference to FIG. In the state where the direction switching valve 52 is at the position I,
The pressurized oil 31 is pumped through the first and second circuits 32a, 32b, respectively, and the respective static pressure pockets 30a, 30
This is the first state in which the pressure oil 31 is supplied to b. Accordingly, each of the static pressure sliding surfaces 24a to 24
c, 25a to 25c, 26a to 26c and guide recess 2
7 to 29, each of the static pressure sliding surfaces 27a to 27c, 28a to 28
An oil film of the pressurized oil 31 is formed between the pressure oils c and 29a to 29c. Therefore, in the moving table 22, low friction sliding is formed between each static pressure sliding surface with the guide rail 21, and the reciprocating linear movement is smoothly performed.

Next, the operation of restraining the reciprocating linear movement of the moving table 22 with respect to the guide rail 21 will be described with reference to FIG.
It will be described based on. By switching the direction switching valve 52 to the II position when the moving table 22 is positioned at the predetermined position, the supply of the pressure oil to the second circuit 32b of the first and second circuits 32a and 32b is stopped. At the same time, the second circuit 32b is brought into the atmospheric pressure state via the drain circuit 32c, and the static pressure pocket 30b and each of the static pressure sliding surfaces 24b to 26b, 2 having the static pressure pocket 30b are provided.
7b-29b will be in an atmospheric pressure state. Thereby, the pressure oil 3
1 is supplied to only the static pressure pocket 30a without being supplied to the static pressure pocket 30b.

Therefore, as shown in FIG. 2, the side where the supply of the pressurized oil is stopped, that is, the upper surfaces 27b and 28b of the guide recesses 27 and 28 of the moving table 22 and the one side surface 29b of the guide recess 29 are on the opposite side. The guide protrusion 2 is provided by hydraulic pressure.
4 to 26 are closely attached to the respective surfaces 24b, 25b, 26b.

As described above, the movable table 22 is firmly restrained at a required position with respect to the guide rail 21. When moving the movable table 22 from the restrained state to the movable state again, the direction switching valve 52 is switched to the position I so that the pressure oil 31 is supplied not only to the first circuit 32a but also to the second circuit 32b. I do. At this time, the second
By the action of the pressure oil 31 ejected from each of the static pressure pockets 30b connected to the circuit 32b, the above-mentioned fixing action between the guide rail 21 and the moving table 22 is released.

Next, effects exerted by the above embodiment will be described. (1) In the present embodiment, only the direction switching valve 52 is provided in one circuit 32b reaching the static pressure pocket 30b, and a clamp device for exclusive use for restraining the worktable device 11 is provided separately. No need to provide. Therefore, it is possible to reduce the size, simplify the configuration, and save energy of the worktable device 11.

(2) In this embodiment, the guide projection 24
-26 static pressure sliding surfaces 24a-24c, 25a-25
c, 26a to 26c, and the respective static pressure sliding surfaces 27a to 27c, 28a to 28c, 29a to 29 of the guide recesses 27 to 29.
c form three static pressure sliding surfaces. Therefore, when the moving table 22 is constrained to the guide rail 21, the contact area and the contact area are increased, and the moving table 22 can be firmly constrained.

(3) In the present embodiment, the directional control valve 52
By switching the supply state of the pressure oil 31 of the work table device 11, the moving table 22 is restrained with respect to the guide rail 21. Therefore, only by adding the direction switching valve 52 for the pressure oil 31 to the existing worktable device, a firm restraining means for the moving table 22 can be provided.
Therefore, the configuration is not complicated, and the conventional apparatus can be easily modified to provide the above-described functions.

(4) In this embodiment, the static pressure pocket 3
When 0b enters the atmospheric pressure state via the drain circuit 32c,
Due to the action of the pressure of the pressure oil 31, each of the static pressure sliding surfaces 24b to 26b of the guide projections 24 to 26 becomes a guide recess 27 to 29.
Are brought into close contact with the respective static pressure sliding surfaces 27b to 29b to be in a fixed state. Therefore, the moving table 22 is mounted on the guide rail 2.
1 and firmly restrained.

The above embodiment can be modified as follows. In the embodiment, the guide projections 24 to 26 of the guide rail 21 and the guide recesses 27 to 2 of the moving table 22 are used.
9 were formed at three places. Of these three locations, the worktable device 11 is configured without the guide projection 26 and the corresponding guide recess 29.

In the above embodiment, the present invention is embodied as a grinding machine provided with the work table device 11, but this is embodied as a work table device applied to a cutting machine, a milling machine or the like.

Even if the configuration is changed as described above, the same effect as the above-mentioned effect can be obtained. Next, technical ideas that can be grasped from the embodiment will be described below. The static pressure sliding device according to any one of claims 1 to 4, wherein pressurized water is supplied instead of pressurized oil. In the case of such a configuration, handling is simpler than that of pressure oil.

The static pressure sliding device according to any one of claims 1 to 4, wherein a pressurized gas is supplied instead of the pressurized oil.
With such a configuration, handling is further simplified as compared with pressurized oil or pressurized water.

[0030]

Since the present invention is configured as described above, it has the following effects. According to the first aspect of the present invention, the switching member switches the hydrostatic sliding device from the first state to the second state, so that the moving member can move to the guide member on the side where the supply of the pressure oil is stopped. Closely fixed. Therefore, the configuration of the entire hydrostatic sliding device can be simplified without providing a dedicated restraint device for the moving member.

According to the invention described in claim 2, according to claim 1
In addition to the effect described above, by providing a plurality of pairs of static pressure sliding surfaces, the moving member is brought into close contact with the guide member on the side where the supply of the pressure oil is stopped, thereby increasing the binding force. Therefore, the moving member can be firmly restrained with respect to the guide member.

According to the invention described in claim 3, according to claim 1
In addition to the effect of 2, the switching valve allows the hydrostatic sliding device to be easily switched from the first state to the second state, has a simple configuration, and can be changed to the conventional device by changing the switching valve. Applicable.

According to the fourth aspect of the present invention, the first aspect is provided.
In addition to the effects of (1) to (3), by bringing the static pressure sliding surface on the side where the supply of the pressure oil is stopped into the atmospheric pressure state in the second state, the above-described close contact fixing can be realized quickly and reliably.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first state of a hydrostatic sliding device according to an embodiment.

FIG. 2 is a sectional view showing a second state.

[Explanation of symbols]

Reference numeral 21: a guide rail as a guide member; 22, a movable table as a movable member;
7 to 29: guide concave portions, 24a to 24c, 25a to 25
c, 26a-26c, 27a-27c, 28a-28
c, 29a to 29c: static pressure sliding surface, 30a, 30b: static pressure pocket, 31: pressurized oil, 52: directional switching valve as switching means.

Claims (4)

[Claims] 1. A static pressure sliding device comprising a movable member movable on a guide member via at least a pair of parallel static pressure slide surfaces provided around the guide member. A first state in which pressure oil is supplied to both surfaces of the static pressure sliding surface, and a supply of pressure oil to one static pressure sliding surface and the supply of pressure oil to the other static pressure sliding surface is stopped. A hydrostatic sliding device provided with a switching means for switching to the second state. 2. The hydrostatic sliding device according to claim 1, wherein a plurality of pairs of hydrostatic sliding surfaces are provided. 3. The static pressure sliding device according to claim 1, wherein the switching means is a switching valve provided in a supply circuit of the pressure oil to the static pressure sliding surface. 4. In the second state, the static pressure sliding surface on the side where the supply of the pressure oil is stopped becomes an atmospheric pressure state.
4. The hydrostatic sliding device according to any one of the above items 3.