JPS637881B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a bar steady rest device, which is installed at the rear of the main shaft of the processing machine, especially when processing a long bar using a processing machine such as a lathe. The present invention relates to a bar steadying device that supports a rotating bar.

(Prior Art) A bar steadying device rotatably supports a bar so that it does not swing during operation of a processing machine.

Conventionally, as a means of rotationally supporting this bar, a bar steady rest device is equipped with a hollow cylindrical support tube for supporting the bar, and this support tube is concentric with the main shaft of the lathe. It is provided to extend adjacent to the main shaft, and the support tube is filled with oil and the swirling flow of this oil causes the bar to float and support rotation.

The support tube has a plurality of oil injection holes and oil return holes provided at predetermined intervals along its entire length, while an oil leakage prevention means is provided at the rear end of the support tube, and a bar at the front end. A cover is provided which allows the passage of oil and has means for preventing oil leakage. Then, after inserting the bar into the support tube and gripping its tip with the chuck of the main engine, oil is injected from the oil injection hole to fill the space between the inner periphery of the support tube and the outer periphery of the bar. The rod is floated by the swirling flow of oil generated as the rod rotates and is supported for rotation.

(Problem to be solved by the invention) However, in the conventional bar steady rest device that supplies pressure oil to the support tube and rotatably supports the bar by the swirling flow of the pressure oil, the pressure oil is not supplied to the support tube. The feeding is carried out by injecting the rod material into the rod receiving space between the rod material and the support tube toward the center of the tube. Therefore, the supplied pressure oil flows in from a direction approximately perpendicular to the swirling flow of pressure oil generated by the rotation of the bar being processed, which disturbs the swirling flow and causes turbulence, which causes the bar to vibrate. There are problems that cause this.

The present invention was devised in view of the above-mentioned circumstances, and its purpose is to rotate the bar while suppressing the vibration of the bar without causing turbulence in the pressure oil in the support tube. An object of the present invention is to provide a bar steady rest device that can be supported.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a bar steady rest device for rotatably supporting a bar supplied to a processing machine. A hollow cylindrical support tube provided concentrically with the center of the main shaft, a plurality of oil injection holes provided at intervals along the tube for supplying pressure oil into the support tube; a plurality of return oil holes provided at intervals along the tube for discharging pressure oil from inside the tube; and a pressure oil return hole fitted to the outer periphery of the support tube for introducing pressure oil into the oil injection hole. an oil introduction member; and a return oil discharge member fitted to the outer periphery of the support tube for discharging pressure oil from the oil return hole; The tube is characterized by being bored in the tangential direction of the inner periphery of the tube.

(Function) According to the above-mentioned means, the oil injection hole for supplying pressure oil into the support tube is drilled in the tangential direction of the inner circumference of the tube along the rotational direction of the bar. Pressure oil can be supplied from the tangential direction along the swirling flow of pressure oil generated by rotation, and a rectifying oil wall can be formed along the inner circumference of the support tube without disturbing the swirling flow of pressure oil, causing vibration in the bar. Rotation support is possible without any problems.

(Example) Hereinafter, an example of the bar steady rest device according to the present invention will be described with reference to FIGS. 1 to 6.

In FIGS. 1 and 2, reference numeral 1 denotes a stand attached to a lathe, which is a main machine (processing machine), and this stand 1 is provided with an opening/closing bar support 2. A support base 3 with a turning rail is provided adjacent to the opening/closing bar support base 2, and a front holding member 5 is provided on this support base 3. Depending on the shape of the lathe, a stand unique to this device may be prepared.

On the other hand, a stand 4 is installed at the rear of the device, and a rear holding member 6 is disposed on the stand 4. A hollow cylindrical support tube 7 is supported by the rear holding member 6 and the front holding member 5. ing. The support tube 7 is arranged to extend coaxially with the main shaft of the main engine, and its rear end is sealed with a rear cover member to prevent oil leakage.

A pressure oil introduction member 9 is provided on the outer periphery of the support tube, as shown in detail in FIGS. 3 to 6.
A large number of return oil discharge members 10 are fitted alternately at intervals, and a pressure oil tube 11 and a return oil tube 12 are arranged below the support tube 7 and extend parallel to its axis. These tubes 11 and 12 are held by respective members 9 and 10 fitted to the support tube 7. O-rings 13 are interposed between both sides of each pressure oil introduction member 9 and the support tube 7, and these O-rings 13 are held by a holding plate 14, which allows the support tube 7 and the pressure oil introduction to be connected. Oil leakage between the member 9 and the member 9 is prevented. Similarly, the pressure oil tube 11 is also connected to the holding plate 1 holding the O-ring 15.
6 are fixed to both sides of the pressure oil introduction member 9 to prevent oil leakage. A wide inner groove is provided at the center of the inner periphery of the pressure oil introduction member 9 that fits into the support tube 7, and a similar inner groove is provided at the fitting portion of the pressure oil tube 11. As shown in FIGS. 3 and 4, oil passage holes a and b passing through the center of the insertion hole of the pressure oil tube 11 from the lower surface of the pressure oil introduction member 9 are bored toward the center of the upper inner groove. There is also an oil passage hole c at the corresponding position of the inserted pressure oil tube 11.
is drilled. The entrance of the oil passage a is a tapered screw hole, and a joint 17 is screwed into this screw hole to only one of the many pressure oil introduction members 9 that is directly connected to the hydraulic power source.
are connected. As shown in FIG. 3, in the portion of the support tube 7 into which each pressure oil introduction member 9 is fitted, housing rods are placed in contact with the inner periphery at three equal positions in the tangential direction from the outer periphery. Oil injection holes d are bored in accordance with the specified rotational direction. The support tube 7, the pressure oil tube 11, and the return oil tube 12 pass through the return oil discharge member 10, and the support tube 7 and the return oil tube 12 are fixed by the same means as the pressure oil introduction member 9. Each return oil discharge member 10
An oil return hole e is bored in the inner circumferential bottom of the support tube 7 into which the support tube 7 is fitted, and an oil hole f and an oil hole g that communicate with the return oil hole e are also provided in the return oil discharge member 10 from the outside. An oil hole h is formed through the center of the insertion hole of the oil return tube 12, and an oil hole h is also formed at the corresponding position of the oil return tube 12. The outlet of the oil hole g is also a tapered screw hole, and a joint 17' is screwed into only one of the return oil discharge members 10.
A flexible tube 18' is connected to this joint 17'. The stand 4 includes a hydraulic oil tank 19 that stores oil used in general hydraulic equipment, a hydraulic pump 20, and an electrical equipment box 21 for operating this device.
is built-in. A hydraulic pump 20 is installed at the front end of the front holding member 5 when the rear end of the bar 22 passes forward.
A detection device 5' is installed to stop the operation of the bar 22 and electrically issue a command to stop the hydraulic pressure supply.Although not shown, a window and radial notches that match the contour and dimensions of the bar 22 are installed. A palate member made of a rubber member is provided as a means for preventing oil leakage. In addition, in the case of a polygonal member or the like, a rotatable means is attached to attach the palate member. When inserting the bar 22 into the support tube 7, the tension between the front holding member 5 and the revolving rail of the support base 3 is loosened, the opening/closing support base 2 is opened, and the support tube 7 is moved to the center position shown in FIG. It can swing on the rail from A to B using the rear holding member 6 as a fulcrum, and when inserting the bar into the support tube 7, the main spindle of the main engine is prevented from interfering with the bar 22.

Next, the operation of the present invention will be described.

When inserting the bar into the support tube 7,
As described above, the support tube 7 is rotated, the bar 22 is pushed in from the palate member of the front holding member 5, and the bar 22 is rotated back to the center position so that the protrusion of the bar 22 is attached to the opening/closing bar support 2 of the stand 1. is clamped and closed to prevent the bar material from coming into contact with extreme drooping due to its own weight within the support tube 7, and the bar material 22 is grasped by passing through the main shaft of the main machine from the tip and sending it out to the grasping part of the chuck. Then, operate the push button of the electrical equipment box 21 to activate the pressure oil pump 20,
Pressure oil is sent to the pressure oil introduction member 9 through the flexible tube 18. Pressure oil directly and pressure oil tube 1
The pressure oil reaches the other pressure oil introduction member 9 via the support tube 7, and is introduced tangentially from the oil injection hole d of the support tube 7 into the space between it and the bar 22, and after being filled, the main shaft of the main engine is rotated. The pressure oil that has spouted and filled the support tube 7 through the plurality of pressure oil introduction members 9 returns to the hydraulic oil tank 19 directly from the plurality of return oil discharge members 10, via the return oil tube 12, and through the flexible tube 18'. As a result, the flow of pressure oil between the support tube 7 and the rod 22 is always rectified, and a rectifying oil wall is formed along the inner circumference. Bar material 2
When 2 is non-rotating, its center is X in Figure 3.
As soon as the rotation starts, it is pressed by the rectifying oil wall and floats up, and is regulated to the Y position concentric with the center of the support tube 7, so smooth rotation continues without vibration and noise. . At this time, if you try to prevent the return oil from flowing out, the pressure oil in the support tube 7 will suddenly become a turbulent flow and the rod 22 will vibrate, but if you allow the return oil to flow freely, the flow will become rectified again and vibrate. It has been confirmed that the rotation is free of .
When machining in the main machine progresses and the rear end of the bar 22 escapes from the front end of the front holding member 5, the detection device 5' detects this and the supply of pressure oil is stopped.

(Effects of the Invention) As is clear from the description of the embodiments, the present invention provides that the oil injection hole for supplying pressure oil into the support tube is arranged in the tangential direction of the inner circumference of the tube along the rotational direction of the bar. Because it is perforated, pressure oil can be supplied from the tangential direction along the swirling flow of pressure oil generated by the rotation of the bar, and a rectifying oil wall can be created along the inner circumference of the support tube without disturbing the swirling flow of pressure oil. It can be formed and rotatably supported without causing vibration to the rod.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the bar steady rest device according to the present invention, FIG. 2 is a plan view of the same bar steady rest device,
Figure 3 is a cross-sectional view taken along line P-P' in Figure 1, Figure 4 is a cross-sectional view taken along R-R' in Figure 3, and Figure 5 is a cross-sectional view taken along line 1 in Figure 1.
6 is a sectional view taken along line Q-Q' in the figure, and FIG. 6 is a sectional view taken along line S-S' in FIG. 1, 4...Stand, 2...Opening/closing bar support base,
3...Support stand with rotating rail, 5, 6...Holding member, 7...Support tube, 9...Pressure oil introduction member, 10...Return oil discharge member, 11...Pressure oil tube, 12... Return oil tube, 17...Joint, 18
... Flexible tube, 19 ... Hydraulic oil tank, 20 ... Pressure oil pump, d ... Injection hole, e ...
Return oil hole.

Claims (1)

[Claims] 1. A bar steady device for rotatably supporting a bar supplied to a processing machine, which includes a hollow cylindrical support tube provided adjacent to the main shaft of the processing machine and coaxial with the center of the main shaft, and this support tube. a plurality of oil injection holes provided at intervals along the tube for supplying pressure oil into the tube; and a plurality of oil injection holes provided at intervals along the tube for discharging pressure oil from within the tube. a plurality of return oil holes; a pressure oil introduction member fitted to the outer periphery of the support tube for introducing pressure oil into the oil injection hole; and a pressure oil introduction member fitted to the outer periphery of the support tube to introduce pressure oil from the return oil hole. and a return oil discharge member for discharging oil, the oil injection hole provided in the support tube being bored in the tangential direction of the inner periphery of the tube along the rotating direction of the rod. Material steadying device.