JPH029524A - Machining method for throttle passage in static pressure supporting device - Google Patents

Abstract

PURPOSE:To make it possible to complete machining in a short time and equalize the channel depth on the sides of a pocket and an oil feeding channel by turning a throttle passage connecting the oil feeding channel and a static pressure pocket around an axis in parallel with the throttle passage and machining with a cylindrical tool having width greater than the throttle passage and with a cutting blade on its outer periphery. CONSTITUTION:First, an oil feeding channel 14 and a static pressure pocket 16 are machined with the end mill of a milling machine. Next, a sliding face 13 is machined with a surface grinder in such a way that its roughness is lessened and smoothened. Furthermore, the cylindrical abrasive wheel 30 of the surface grinder is positioned in parallel with each throttle passage, and the abrasive wheel 30 is moved toward the sliding face 13, then the cross section of the throttle passage 15 is machined in a circular arc. Since the abrasive wheel 30 has, as its cutting blade, abrasive grains on its outer periphery and its width is greater than the throttle passage 15, the thermal expansion of the throttle passage 15 during the machining process becomes the same on the side of the oil feeding channel 14 and that of the static pressure pocket 16, which makes it possible to equalize the depth of the throttle passage 15 and to complete the machining in a short time.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for processing a throttle (/)i111!8 that supplies pressure oil from an oil supply groove to a static pressure pocket in a static pressure support device for a sliding body. be.

<Prior Art> As one of such static pressure support devices for a sliding body, as shown in FIG. A plurality of static pressure pockets 4 are formed, and a throttle passage 5 is formed on the sliding surface 2 to communicate the oil supply groove 3 and the static pressure pocket 4. Some guide members have a supply path for supplying pressure oil to the oil supply groove.

The throttle passage 5 was machined by moving the end mill 6 in the longitudinal direction of the throttle passage 5 while rotating it.

<Problems to be Solved by the Invention> As described above, when the throttle passage 5 is processed by the end mill 6, there is a problem that the processing time becomes long.

Further, there was a problem in that the depth of the throttle passage 5 differed between the oil supply groove 3 (1!IJ) and the static pressure pocket 4 side due to thermal expansion during processing.

<Means for Solving the Problems> The present invention has been made in order to solve the above-mentioned problems.The present invention has been made in order to solve the above-mentioned problems. It is machined using a cylindrical tool that rotates around an axis parallel to the aperture, has a width larger than the throttle passage, and has a cutting edge on its outer periphery.

Action> Position the tool so that it is parallel to the throttle passage, and move the tool toward the sliding surface without rotating it. As a result, a throttle passage is formed on the sliding surface so that the cross section is arcuate.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 3 to 5. 10 is a guide member, and this guide member 10 is formed with a guide surface 12 that guides and supports the sliding body 11 in a slidable manner. A sliding surface 13 is formed on the sliding body 11 and is guided and supported by the guiding surface 12 . In particular, as shown in FIG. 4, the sliding surface 13 on the side surface has an oil supply groove 14 in the moving direction of the sliding body 11, a plurality of throttle passages 15 communicating at right angles to the oil supply groove 14, and a plurality of throttle passages 15 at right angles to each throttle passage 15. A communicating static pressure pocket 16 is formed.

The guide member IO has a guide surface 12 at one end at a position where pressure oil can be supplied to the oil supply groove 14 despite the movement of the sliding body 11.
A supply path 20 is formed that opens on the side. Guide surface 12
There is a bearing clearance 21 between the sliding surface 13 and the sliding surface 13 as shown in FIG.
is formed.

Pressure oil is supplied to the oil supply groove 14 via the supply passage 20 and further supplied to each static pressure pocket 16 via the throttle passage 15. The pressure oil supplied to each static pressure pocket 16 flows through the bearing clearance 21 to the outside of the bearing clearance 21 . The sliding body 11 is statically supported by the guide member IO by the static pressure generated in each static pressure pocket 16, the throttle passage 15, and the oil supply groove 14.

Next, the sliding surface 13. Oil supply groove 14. static pressure pocket 16,
A method of processing the throttle passage 15 will be explained based on FIGS. 1 and 2. First, the oil supply groove 14 and the static pressure pocket 16
is processed using the end mill of a milling machine in the same way as before. Next, the sliding surface 13 is machined using a surface grinder so that it is flat and has a small surface roughness. Further, a cylindrical grinding wheel 30 rotating around the horizontal axis of the surface grinder is positioned so as to be parallel to each throttle passage 15, and the grinding wheel 30 is positioned parallel to each throttle passage 15.
0 to the sliding surface 13 side, the throttle passage 1
5 is processed to have an arcuate cross section. The other throttle passages 15 are similarly processed into arcuate shapes by positioning the grinding wheel 30 at a position corresponding to the throttle passage 15 and moving it toward the sliding surface. Since the grinding wheel 30 has abrasive grains on its outer periphery as cutting edges and has a width larger than the throttle passage 15 (width in the longitudinal direction of the throttle passage 15), thermal expansion of the throttle passage 15 during machining is avoided. is the same on the oil supply passage 14 side and the static pressure bokent 16 side, the depth of the throttle passage 15 can be made the same, and machining can be performed in a short time.

In addition, in the embodiment described above, the oil supply groove 14 and the static pressure pocket 1
6 was described using an end mill of a milling machine, but since depth accuracy is not required,
You can leave it as a cast iron.

Further, in the embodiment described above, an example was described in which a grinding wheel 30 having cutting edges made of abrasive grains was used on the outer periphery, but the throttle passage 1
A milling cutter that rotates around an axis parallel to 5 and has a cutting edge on the outer periphery may also be used.

<Effects of the Invention> As described above, the present invention rotates the throttle passage that communicates the oil supply groove and the static pressure pocket about an axis parallel to the throttle passage so that the cross section is arcuate, and Machining is done using a cylindrical tool with a large width and a cutting edge on the outer periphery, so it can be machined in a short time.Moreover, since the static pressure pocket side of the throttle passage and the oil supply groove side are machined at the same time, the static pressure pocket of the throttle passage can be machined at the same time. The effect of making the groove depth on the side groove and the groove depth on the oil supply groove side the same can be obtained.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention,
Figures 1 and 2 are diagrams showing the state of machining of the throttle passage by the grinding wheel. Figure 1 is a cross-sectional view taken in a direction perpendicular to the longitudinal direction of the throttle passage, and Figure 2 is a diagram taken along the line ■-■ in Figure 1. Figure 3 is a cross-sectional view showing the sliding body guided and supported by the guide member, Figure 4 is a diagram showing the sliding surface seen from direction ■ in Figure 3, Figure 5 is FIG. 4 is a cross-sectional view taken along the line ■-■, and FIG. 6 is a diagram showing the processing state of a conventional throttle passage. 10... Guide member, 11... Sliding body, 13...
Sliding surface, 14... Oil supply groove, 15... Throttle passage, 16
... Static pressure pocket, 20 ... Supply path, 30 ... Grinding wheel (tool).

Claims (1)

[Claims] (1) A lubrication groove is formed on the sliding surface of the sliding body in the sliding direction of the sliding body, as well as a plurality of static pressure pockets, and a throttle passage is formed on the sliding surface to communicate the lubrication groove and the static pressure pocket. In a static pressure support device for a sliding body, in which a supply path for supplying pressure oil to the oil supply groove is formed in a guide member that slidably guides and supports the sliding body, the sliding body rotates around an axis parallel to the throttle passage. A method for machining a throttle passage in a static pressure support device, characterized in that the throttle passage is machined to have an arc-shaped cross section using a cylindrical tool having a width larger than the throttle passage and a cutting edge on the outer periphery.