JPH0767655B2 - Positioning guide fixing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning guide fixing device for a sliding member that is slidable on a main body such as a work placement table in an apparatus such as a machine tool.

[Conventional technology]

In a conventional device such as a machine tool, a static pressure guide means is interposed between a main body and a sliding member such as a table capable of sliding the main body, and the sliding member is guided by a separate drive source. Some work is performed by moving the contact / sliding member to a desired stop position and stopping and holding it. In such an apparatus, the accuracy of the entire apparatus depends on the accuracy of the supporting rigidity of the sliding member, the positioning feed, and the rigidity of the stop holding.

[Object of the Invention]

The present invention has been made based on the above circumstances,
An object of the present invention is to provide a positioning guide fixing device for a sliding member, which is capable of fixing a sliding member having a large stop-holding rigidity, a large supporting rigidity, and a high-precision positioning feed.

[Structure of Invention]

The positioning guide fixing device of the present invention includes a main body having a trapezoidal groove, a facing slope portion inclined from the vertical direction of the trapezoidal groove, and a sliding member that engages with the upper surface of the main body and slides linearly.
A plurality of static pressures capable of pressurizing and supplying fluid to the sliding surface where the sliding member engages with the upper surface of the main body and the opposing sliding surface where the sliding member engages with the trapezoidal groove and which is inclined from the vertical direction. Pockets are provided, and fluid pressures of different pressures are independently supplied to the static pressure pockets provided on the opposing sliding surfaces that are inclined from the vertical direction.

During sliding, the fluid pressure supplied to one of the static pressure pockets provided on the opposing sliding surfaces inclined from the vertical direction is made lower than the fluid pressure supplied to the other, so that the sliding members face each other. One of the sliding surfaces is slid on the main body through a minimum oil film that does not generate a frictional force due to solid contact in a biased state.

At the time of fixation, the fluid pressure supplied to one of the static pressure pockets provided on the opposing sliding surfaces inclined from the vertical direction is removed, and the fluid pressure supplied to the other removes the fluid pressure of the opposing sliding surface of the sliding member. Fix one to the body.

Example of Invention

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view showing a state where the sliding member slides on the main body, and FIG. 2 is a side sectional view showing a state where the sliding member is fixed.

In the figure, reference numeral 1 denotes a main body of a machine tool or the like, which is fixed on a foundation surface plate 2. Reference numeral 3 in the drawing denotes a sliding member slidably arranged on the main body 1. That is, the main body 1 is formed with a trapezoidal groove 4, while the sliding member 3 is formed with a ridge 5 having a shape corresponding to the trapezoidal groove 4, and the ridge 5 is the trapezoidal groove 4. Is loosely fitted to. These main body 1
Between the sliding member 3 and the first static pressure pocket 6, the second static pressure pocket 6,
The static pressure guide means including the static pressure pocket, the pipe 8, the working fluid supply source (not shown), etc. is provided. That is, the first and second static pressure pockets 6 and 7 are provided on the side walls of the protruding portion 5 of the sliding member 3, and are supplied with the working fluid of a predetermined pressure via the pipes 8 and 8, respectively. The first and second static pressure pockets 6 and 7 act on the sliding member 3 with fluid pressures whose horizontal components face each other. In the figure, 9 is a sliding member 3.
Is a static pressure pocket for smooth sliding.

In the apparatus having the above-mentioned structure, this embodiment guides and fixes the sliding member 3 as follows.

First, at the time of sliding guide, a relatively high pressure working fluid is supplied to the first static pressure pocket 6, and a static friction force (friction force due to solid contact) is applied to the second static pressure pocket 7. Supply a working fluid with a relatively low pressure that can secure a minimum oil film that does not occur. In such a supply state of the working fluid, as shown in FIG. 1, the gap 10 on the side where the first static pressure pocket is arranged is kept wide, while the gap 11 on the side where the second static pressure pocket is arranged is kept narrow. . The sliding member 3 is hydrostatically guided in the above-described state, and receives power from a drive source (not shown) to form the main body 1.
Slide on. According to such a sliding guide, since the contact state between the main body and the sliding member does not change, it is possible to perform highly accurate positioning feed without being affected by the frictional force. Further, in the embodiment in which the main body is slid through the minimum oil film, the amount of deformation of the minimum oil film during sliding is small, so sliding guide with less shaking during sliding and large support rigidity is possible. Become.

Next, when the sliding member 3 is fixedly held at the stop position,
While supplying the working fluid to the first static pressure pocket 6 as it is, the supply of the working fluid to the second static pressure pocket 7 is stopped. Then, the sliding member 3 is moved by the fluid pressure from the first static pressure pocket 6 as shown in FIG.
In the side where the second static pressure pocket is provided. The amount of movement of the sliding member 3 in the pressing direction at this time is extremely small because the gap 11 is kept narrow in the static pressure guide state as described above. Therefore, a reliable holding state can be maintained without deviation from the target stop position. Further, since the opposing sliding surfaces inclined from the vertical direction of the trapezoidal groove narrowing upward and the sliding surfaces in the horizontal direction cooperate to perform the fixing action, a large holding rigidity can be obtained.

As a modification of the above embodiment, the contact surface between the sliding member 3 and the main body 1 may be widened by stopping the supply of the working fluid to the static pressure pocket 9 when the sliding member 3 is fixed.

〔The invention's effect〕

In the positioning guide apparatus according to the present invention, the sliding member slides on the slanting opposing sliding surfaces in a biased state, but the minimum oil film has a small amount of deformation in the sliding state, so stable and less blurring occurs. A large supporting rigidity during sliding can be obtained.

Furthermore, when holding the sliding member fixed at the stop position,
A large holding rigidity can be obtained by the synergistic action of the inclined slidable sliding surfaces and the horizontal sliding surface. Furthermore, in the positioning guide apparatus according to the present invention, since the amount of displacement of the sliding member at the time of fixing is extremely small, the stop position can be accurately held and fixed to the main body without causing positional displacement.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention,
FIG. 1 is a side sectional view showing a state where the sliding member slides on the main body, and FIG. 2 is a side sectional view showing a state where the sliding member is fixed. 1 ... Main body, 3 ... Sliding member 4 ... Trapezoidal groove 6 ... First static pressure pocket 7 ... Second static pressure pocket 9 ... Static pressure pocket.

Claims (1)

[Claims] 1. A main body provided with a trapezoidal groove whose upper portion is narrowed, and an inclined surface portion of the trapezoidal groove whose upper portion is narrowed and which opposes the vertical direction and which slides linearly by engaging the upper surface of the main body A sliding member is provided, and fluid is pressurized and supplied to the sliding surface where the sliding member engages with the upper surface of the main body and the facing sliding surface where the sliding member engages with the trapezoidal groove and which is inclined from the vertical direction. There are multiple static pressure pockets that can be used, and fluid pressures of different pressures are independently supplied to the static pressure pockets that are provided on the opposing sliding surfaces that are inclined from the vertical direction. By setting the fluid pressure supplied to one of the static pressure pockets provided on the opposing sliding surfaces inclined from the direction to be lower than the fluid pressure supplied to the other, the opposing sliding surfaces of the sliding member One side of the main body does not generate frictional force due to solid contact in a biased state Sliding through the minimum oil film, when fixed, removes the fluid pressure supplied to one of the static pressure pockets provided on the opposing sliding surfaces inclined from the vertical direction, and slides with the fluid pressure supplied to the other. A positioning guide fixing device configured to fix one of the facing sliding surfaces of the moving member to the main body.