JPS61244433A - Static-pressure force generating apparatus - Google Patents

Abstract

PURPOSE:To permit a necessary static pressure force to act onto the slidable surface of a machine tool, etc. by inserting and fixing a thin pipe into the insertion hole on a body installed in demountable ways for the oil pockets formed onto the slidable surface, in a static-pressure generating apparatus for the slidable surface. CONSTITUTION:A pair of guide grooves 2 are formed in recessed form onto the inside surface of a saddle 1. A projecting part 4 is formed onto the lower part on the both side surfaces of a movable table 3 for supporting a work, and said movable table 3 is supported in slidable ways for the saddle 1 through the fitting between the guide groove 2 and the projecting part4. A air of oil pockets are formed onto each slidable surface 5, and a tapered screw 11 is formed onto the bottom surface so as to communicate to an oil feeding passage 7, and a pressurized-oil feeding member 8 is installed into the tapped hole 11. Said member 8 consists of a taper stop screw 9 having a hexagonal hole screwed in demountable ways into the tapped hole 11 and a thin pipe 10 fixed into an insertion hole 12. The pressurized oil 15 is supplied into the oil pocket 6 through the thin pipe 10, and a static pressure force acts onto the slidable surface 5.

Description

[Detailed Description of the Invention] Purpose of the Invention (Industrial Application Field) This invention is installed in an oil pocket provided on a sliding surface of a machine tool, etc., and supplies pressure oil to the oil pocket. The present invention relates to a static pressure generating device that generates static pressure on a sliding surface.

(Prior Art) Conventionally, as a static pressure generating device for this cover, for example, as shown in FIG. As shown in the figure, a device in which an aperture slit 24 is formed by a pair of thin blade bodies 23 is known.

(Problems to be Solved by the Invention) However, in a static pressure generating device used for sliding surfaces of machine tools, etc., in order to obtain a predetermined static pressure, the diameter of the throttle hole 22 or the diameter of the throttle slit 24 is changed. The gap is usually 0.1-
Since it is necessary to set the minute dimension value of 0.5 mm,
There are problems in that the drilling of the aperture hole 22 is very difficult, and the finishing of the end face of the thin blade body 23 is very troublesome, resulting in high production costs in both cases.

Moreover, in the former case, if the inner circumferential surface of the throttle hole 22 is formed to be rough, it is difficult to efficiently generate the required static pressure according to the designed value due to the action of contact friction with the pressure oil passing therethrough. Since this is difficult, it is necessary to finish the inner circumferential surface of the aperture hole 22 smoothly after drilling it, which requires a great deal of time and effort.

Structure of the Invention (Means for Solving the Problems) The present invention has been made by paying attention to the above-mentioned problems, and an insertion hole 12 is formed through the main body 9 which is removably attached to the oil pocket 6. A thin tube 10 is inserted and fixed into an insertion hole 12.

(Function) Therefore, in the static pressure generating device of the present invention, the main body 9
Separately, if the thin tube 10 is manufactured by pultrusion molding etc. so that its inner diameter has the required dimension value, the thin tube 1
The insertion hole 12 has a large inner diameter corresponding to the outer diameter of the main body 9.
This makes the drilling process extremely easy, and the finishing accuracy of the inner circumferential surface can be low, thereby significantly reducing the manufacturing cost of the entire device.

Moreover, since the inner circumferential surface of the thin tube 10 is formed with good surface roughness by the above-mentioned pultrusion molding, etc., the contact frictional resistance with the pressure oil 15 can be kept low, and the static pressure according to the required design value can be efficiently maintained. It can be made to work well. Further, since the main body 9 is removably attached to the oil pocket 6, maintenance work such as cleaning or replacement can be easily performed.

(Example) Hereinafter, an example in which the present invention is embodied in a static pressure generating device for a table sliding device in a surface grinder or the like will be described based on FIG. 12.

In Fig. 1, reference numeral 1 denotes a saddle as a sliding guide provided in a part of the machine frame, and a pair of guide grooves 2 (only one shown) extending opposite to each other are recessed in the inner surface of the saddle. There is.

Reference numeral 3 denotes a movable table for supporting a workpiece, and a convex portion 4 that movably fits into the guide groove 2 is formed at the lower part of both sides of the table. The movable table 3 is slidably supported with respect to the saddle 1 by fitting the guide groove 2 and the convex portion 4.

The upper surface, side surface, and lower surface of the convex portion 4 each serve as a sliding surface 5 of the movable table 3, and each sliding surface 5 has a pair of oil pockets 6 in the shape of a groove extending along the sliding direction. It is formed to extend. A tapered screw hole 11 is formed in the bottom of each oil pocket 6 so as to communicate with the oil supply passage 7 provided through the movable table 3, and a pressure oil supply member 8 is attached to the screw hole 11. .

This pressure oil supply member 8 includes a hexagon socket taper set screw 9 that is removably screwed into a tapered screw hole 11, and a thin tube 10 that is inserted and fixed into an insertion hole 12 that extends on the axis of the hexagon socket taper set screw 9.
It is composed of. Pressure oil 15 from the oil supply passage 7 is supplied into the oil pocket 6 through this thin tube lO, and static pressure is applied to each sliding surface 5 of the movable table 3 by the pressure oil 15. There is. By the way,
In this example, a commercially available injection needle is used as the thin tube 1o.

Reference numeral 14 shown in FIG. 1 is a take-out hole for taking out the pressure oil supply member 8 to the outside during cleaning or replacement. ing. Also, as shown in FIG. 2, a pressure oil supply member 8 provided in the upper oil pocket 6
In this case, the direction of the hexagon socket taper set screw 9 is reversed, and a communication path 18 is formed between the protruding side of the thin tube 10 and the bottom surface of the oil pocket 6. In the figure, 16 is a cap screw for closing the opening of the extraction hole 14.

Therefore, in the static pressure generating device of this embodiment having the above configuration, since a syringe needle is used as the thin tube IO of the pressure oil supply member 8, the surface roughness of the inner circumferential surface is good and the pressure oil 15 The influence of contact frictional resistance with the sliding surface 5 is small, and static pressure can be applied to the sliding surface 5 in accordance with the required design value. Moreover, the outer diameter of the injection needle is usually 0.5 to 1.0 mm.
Since it is relatively thick, the insertion hole 12 can be easily bored into the hexagonal socket taper set screw 9. Then, by inserting and fixing the thin tube 10 into the bored insertion hole 12 using an adhesive or the like, the pressure oil supply member 8 can be manufactured extremely easily.

Furthermore, if a hexagonal socket taper set screw 9 is used as the main body, its taper action improves the sealing performance for the taper screw hole 11, and there is no risk of leakage of the pressure oil 15. It should be noted that a normal hexagonal socket set screw without a tapered shape may be used as the main body, but in this case, it is necessary to screw the main body through a sealing material.

Effects of the Invention As detailed above, in the static pressure generating device of the present invention, if the thin tube is manufactured separately from the main body by pultrusion molding etc. so that its inner diameter has the required attachment value, the thin tube can be easily removed. The insertion hole with a large inner diameter corresponding to the outer diameter of the device can be penetrated through the main body, making the drilling process extremely easy and requiring low finishing accuracy on the inner peripheral surface, thereby reducing the manufacturing cost of the entire device. This can be significantly reduced.

Moreover, since the inner circumferential surface of the thin tube is formed with good surface roughness by the above-mentioned pultrusion process, the contact friction resistance with the pressure oil can be kept low, and the static pressure according to the required design value can be applied efficiently. can be done. Further, since the main body is removably attached to the oil pocket, maintenance work such as cleaning or replacement can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a static pressure generating device according to an embodiment of the present invention assembled to a table sliding device, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. , 4 are sectional views showing conventional devices, respectively. In the figure, 5 is a sliding surface, 6 is an oil pocket, 8 is a pressure oil supply member, 9 is a hexagon socket taper set screw as a main body, 10 is a thin tube, 12 is an insertion hole, and 15 is pressure oil.

Claims (1)

[Claims] 1. It is installed in an oil pocket (6) provided on a sliding surface (5) of a machine tool, etc., and supplies pressure oil (15) to the oil pocket (6) to In a static pressure generating device that generates static pressure on a sliding surface (5), an insertion hole (12) is provided through a main body (9) that is removably attached to the oil pocket (6), and the insertion hole (12) is inserted through the main body (9). A static pressure generating device characterized in that a thin tube (10) is inserted and fixed into a hole (12). 2. The static pressure generating device according to claim 1, wherein the main body is constituted by a hexagon socket taper set screw (9). 3. The static pressure generating device according to claim 1, wherein a syringe needle is used as the thin tube (10).