JPH02124269A - Feeding unit for grinding liquid - Google Patents

Abstract

PURPOSE:To constrain the wear of a sliding face by constituting so that a rotating shaft part and ring member become in non-contact by one part of the feeding liquid fed between a rotating shaft part and non-rotating ring member. CONSTITUTION:A grinding liquid is led by feeding to a grinding liquid lead-in part 37 via a hose 39. One part of the led grinding liquid is flowed out to the external part from the gap between the outer periphery of a rotary shaft part 36 and ring member 38 and the remaining grinding liquid is flowed into a 2nd passage 35 from an inlet port 34 and fed to a grinding face via a 1st passage 33 and an outlet port 32 via the shaft center hole part of a grinding tool 31 and the function as a grinding liquid is displayed. Consequently, the ring member 38 hardly comes into contact directly with the outer peripheral face of the rotary shaft part 36 by the grinding liquid slightly flowed out of the gap between the ring member 38 and rotary shaft part 36 and the wear of the sliding face is restrained.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a grinding fluid supply device.

[Prior Art] In general, grinding and polishing equipment performs processing while supplying a grinding fluid to the processing surface in order to improve processing efficiency and accuracy of the finished surface.

This grinding fluid can be supplied from a supply section disposed around the tool or workpiece, or from near the center of rotation of the tool (for example,
(as disclosed in Japanese Patent Publication No. 2003-11201), and two straws are selected and combined as appropriate and used.

The schematic configuration for feeding from near the center of rotation of the tool is shown in Part 8.
As shown in FIG. 8, this configuration is such that a grinding wheel 2 is removably attached to a spindle shaft 1, and a pulley 3 attached to the spindle shaft 1 and a rotating shaft of a drive motor 4 are attached to each other.
A belt 6 is passed between the belt 6 and the J-shaped pulley 5, and the grindstone 2 is rotated to grind the workpiece.

On the other hand, the grinding oil is introduced from a hose 7, and this hose 7 is communicated with a grinding oil passage (not shown) provided inside the spindle shaft 1 through a rotary joint 8. The oil passage communicates with a grinding oil passage (not shown) provided inside the grinding wheel 2, and furthermore, the grinding oil path of the spindle shaft 1 communicates with a grinding oil passage (not shown) provided inside the grinding wheel 2. They communicate with each other to supply grinding oil to the workpiece, and the used grinding oil is collected by a receiving frame 9.

Conventionally, this type of rotary joint includes one having a surface contact type sealing material as shown in FIG. 9, and another having a line contact type sealing material as shown in FIG. 10.

Next, the above-mentioned conventional rotary joint will be explained with reference to the drawings.

FIG. 9 is a cross-sectional side view of the upper half of a rotary joint having a surface-contact type sealing material. In the third embodiment, the rotary joint 10 includes a polishing shaft 11, which is made of a hollow tube shaft, and whose tip is a polishing liquid spout 11a, and rotatably supports the polishing shaft 11. It has an inlet 12 through which the polishing liquid flows into the coaxial shaft 11 from the rear end, and a suction hole 13 through which the polishing liquid leaking from the sealing surface 11c of the polishing shaft 11 is sucked.

It is fitted into a fixed polishing shaft support member 14 and a hole communicating with the inlet port 12 in this support member 14, and its tip surface is in surface contact with the sealing surfaces 1, 1c on the rear end surface of the polishing shaft 11. A seal ring 15, a radial ball bearing 16 and a mechanical seal ring 17 disposed within the support member 14 and rotatably supporting the polishing shaft 11,
Its main parts are composed of: The bottom of the abrasive bearing hole 14a of the support member 14 communicates with the abrasive liquid inlet 12, and the seal ring 15 is pressed from the rear into the bottom so that the end surface of the seal ring 15 is connected to the abrasive shaft. A coil spring 18 is interposed to press against the rear end surface of 11. Further, near the tip of the polishing shaft 11 that protrudes outward from the support member 14, there is a driven portion 1 of the same shaft 11.
A gear 1b is integrally provided. In the figure, reference numeral 15a indicates a locked portion formed to protrude from the outer circumferential surface of the seal ring 15, and reference numeral 14b indicates a portion of the seal ring 15 that engages with the locked portion 15a. Rotation stop portions formed in a protruding manner within the support member 14 for inhibiting rotation are shown.

The rotary joint 10 configured in this way operates as follows. That is, the support member 14 is attached and fixed to a non-IJ1 member such as a polishing machine (not shown), and the polishing shaft 11 is rotated from a drive source (not shown) via its driven portion 11'o. The driving force is transmitted and it rotates. The polishing liquid flowing in from the inlet 12 with a predetermined pressure is applied to the seal ring 15 and the polishing shaft 1.
1 and is ejected from the jet port 11a of the polishing @ 11 toward the surface to be polished, such as a glass lens, thereby polishing the lens surface.

The suction hole 13 is provided opposite to the sealing surface 11c, and a suction device (not shown) connected to the suction hole 13 sucks the polishing liquid leaked to the outside of the polishing shaft 1 through the sealing surface 11c. It is designed to be discharged outside. Further, the mechanical seal ring 17 prevents the polishing powder leaking from the sealing surface 11C from entering the radial ball bearing 16.

On the other hand, a conventional rotary joint having a line contact type sealing material is constructed as shown in FIG.

It should be noted that, among the constituent members of the rotary joint 20 in FIG. 10, those similar to the constituent members of the rotary joint 10 in FIG. Polishing shaft 2 in this rotary joint 20
1, the rear end portion is the seal ring 1 shown in FIG. 9 above.
The inner circumferential edge of the mechanical seal ring 22 is arranged so as to be in line contact with the outer circumferential surface of this rearwardly extending portion. Above polishing shaft 2
The polishing liquid spout 21a provided at the tip of the rotary joint 1.1 and the driven portion 11b are formed in exactly the same manner as the spout 11a and the driven portion 1.1b of the rotary joint 10 shown in FIG. , its effect remains the same. In this joint 20, the fixed polishing shaft support member 14 and the polishing 7 shaft 21
A mechanical seal ring 22 is used to prevent the polishing liquid from leaking between the two, and the line contact between this and the seal ring I7 to the outer peripheral surface of the polishing shaft 21 allows
The grinding T7 liquid is prevented from flowing into the radial ball bearing 16, and this is the only point that differs from the rotary joint IO shown in FIG. 9 above.

Conventional rotary joints were constructed in this way.

[Problem to be Solved by the Invention] As is well known, not only the abrasive but also impurities are mixed into the polishing liquid as it is repeatedly used. 11c, 21c
When leakage occurs, it is inevitable that the sealing surfaces 11c and 21c will be worn out and their 7'-ru function will be reduced. In the case of the surface contact type rotary joint (10), the wear of the seal surface 11c is the wear of the seal ring 15 pressed by the coil spring 18.
However, if a polishing fluid containing impurities is used, the life of the polishing shaft will be surprisingly short (3 months at most). , the line contact type rotary joint 20 shown in FIG. 10 does not have such a wear compensation function.
In this case, there was a further problem that the life of the polishing shaft was shortened.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a grinding fluid supply device that has an hour wheel configuration and can significantly extend the life of the device.

[Means to solve the problem]

FIG. 1 shows a conceptual diagram (basic configuration diagram) of a grinding fluid supply device according to the present invention. As shown in the figure, the grinding fluid supply bag Z30 has a first outlet 32 in the direction of the grinding tool 31.
Passage 33. and a rotating shaft portion 36 (which may be a spindle or other component) having a second passage 35 communicating with the first passage 33 having an inlet 34 on its outer periphery.
and a grinding fluid introducing portion 37 that is fitted into the rotating shaft portion 36 and for introducing grinding fluid between the outer peripheral portion of the rotating shaft portion 36.
It is composed of a ring member 38 that forms a. Reference numeral 39 indicates a hose for supplying the grinding fluid to the grinding fluid introduction section 37.

[For production]

In the above configuration, the grinding fluid is supplied to and introduced into the grinding fluid introducing portion 37 via the three hoses. A portion (a small amount) of the introduced grinding fluid flows out from the gap between the outer periphery of the rotating shaft portion 36 and the inner circumferential surface of the ring member 38.
The remaining grinding fluid flows into the second passage 35 from the inlet 34, passes through the first passage 33 and the outlet 32, and is supplied to the grinding surface through the axial hole of the grinding tool 31, and functions as a grinding fluid. demonstrate. Therefore, the ring member 38
Due to the grinding fluid slightly flowing out from the gap between the rotary shaft portion 36 and the rotary shaft portion 36, direct contact with the outer circumferential surface of the rotary shaft portion 36 is almost eliminated.

[Example] Hereinafter, an example of the present invention will be described in detail using the drawings. In the following description, the same components as those shown in FIG. 1 are designated by the same reference numerals.

(First Embodiment) FIG. 2 is a front sectional view showing a first embodiment of a grinding fluid supply device 30 according to the present invention, and the figure shows an example in which a grinding tool 31 is fixedly installed.

As shown in the figure, the grinding fluid supply device 30 is attached to the upper end of a spindle 41 that is rotationally driven via a drive device (not shown).

The grinding fluid supply device 30 has a spindle 4 at its lower axial center.
A shaft portion (
a rotating shaft portion) 36 and a ring member 4 loosely fitted to the shaft portion 36
4, and a grinding fluid supply hose portion 45 for supplying and introducing grinding fluid (not shown) between the outer circumferential surface of the shaft portion 36 and the inner circumferential surface of the ring member 44.

A first passage 33 communicating with a communication hole 46 extending through the axis of the grinding tool 31 is formed at an appropriate depth above the axis of the shaft portion 36 . The shaft portion 36 is composed of a large diameter shaft portion 36a, a medium diameter shaft portion 36b2, and a small diameter screw shaft portion 36c having a screw portion 49 via step portions 47 and 48.
A concave groove 50 having an appropriate width (length in the axial direction) is formed around the axis of the outer periphery of 6b. The ring member 38 is loosely fitted to the medium-diameter shaft portion 36b, and is set so that a slight gap is maintained between the inner peripheral surface of the ring member 38 and the outer peripheral surface of the medium-diameter shaft portion 36b. be. Further, an appropriate gap is maintained between the step portion 47 and the step portion 47 as well. A second passage 35, which is perpendicular to the axial direction of the shaft part 36 and communicates with the first passage 33, extends through the groove 50 of the medium diameter shaft part 36b.

A joint 5] is fixed to the ring member 38, and is connected to the joint 51 in the grinding fluid introduction part 37 formed between the inner circumferential surface of the ring member 38 and the groove 50 on the side of the medium diameter shaft portion 36b. Grinding fluid is supplied from a connected hose 39. That is, the grinding fluid from the three hoses is transferred to the grinding fluid introduction section 37.
．． Via the inlet 34 a second passage 35. It is set to flow (introduce) into the first passage 33 and into the communication hole 46 of the grinding tool 31 via the outlet 32.

A cover 52 is fixed on the top of the spindle 41 to prevent grinding fluid from entering, and works with a receiving frame 54 having a tube body 53 coaxial with the spindle 41 to protect the spindle 41 when the grinding fluid falls. It is constructed to prevent infiltration.

The grinding tool 31 is composed of a grinding portion 55 and a shaft portion 56, and the shaft center portion is provided with a female thread portion 57 that screws into the threaded portion 49 of the shaft portion 36.

In the two grinding machines equipped with the above-mentioned 1N grinding liquid supply device 30, the rotation of the spindle 15 is transmitted to the grinding tool 31 via the shaft part 36, and the workpiece such as a lens is ground in the grinding part 55. It is something to do.

When grinding, at the same time, apply the grinding fluid to hose 3.
9 into the grinding fluid introduction part 37 at a predetermined pressure.
do. A part of the pumped grinding fluid flows out from the gap between the ring member 3 and the medium-diameter shaft portion 36b, and the flowing out grinding fluid falls downward and is accommodated (collected) in the receiving frame 54. Most of the remaining grinding fluid flows into the second passage 35 from the inlet 34, and flows into the first passage 33. It is supplied to the grinding surface through the communication hole 46 and functions as a grinding fluid.

The used grinding fluid falls downward and is accommodated in the receiving frame 54.

In particular, in this embodiment, the ring member 38 is caused to float from the shaft portion 36 by the grinding fluid slightly flowing out from the gap between the medium diameter shaft portion 36b and the ring member 38. Shaft part 3G and ring member 3 during rotation
8 is eliminated, and as a result, wear on the sliding surface is eliminated or extremely reduced, and the life of the shaft portion 36 and, by extension, the life of the grinding device can be greatly extended.

In addition, in an example using a conventional rotary joint, it is necessary to provide a dedicated grinding fluid passage (communication hole) inside the spindle, but the grinding fluid supply device 30 of this embodiment has a grinding fluid passage in the spindle 41. without providing - spindle 4
1 and the grinding tool 31, it can perform its function, so it can be easily applied to a grinding machine having a spindle without a grinding fluid passage, and the range of application can be greatly expanded.

Furthermore, compared to the conventional rotary joint configuration, the structure is simpler and the number of parts is reduced, making it possible to significantly downsize the device.

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention. The feature 1 of this embodiment is that the structure of the shaft portion 36 in the first embodiment is different from that of the grinding tool 31.
This is because the shaft portion 56 of the example is also configured. That is, the communication hole 46 provided in the axial center of the grinding tool 31 is also used as the first passage 33 in the first embodiment, and the t+b portion 56 of the grinding tool 31 is provided with a second passage orthogonal to the communication hole 46. 35 is installed through it. The grinding tool 31 connects to the spindle 4 through a threaded portion 60 provided at the bottom of the shaft.
It is configured to be screwed onto the female threaded portion 61 on the first side. Since the other components are the same as those in the first embodiment, the same components as those shown in FIG. 2 are given the same reference numerals and their explanations will be omitted.

According to the above configuration, since the distance from the grinding fluid introduction part to the grinding surface can be set short, potential energy loss during supply of the grinding fluid is reduced, and a large amount of the grinding fluid can be supplied. Other functions and effects are the same as those in the first embodiment, so their explanation will be omitted.

(Third Embodiment) FIG. 4 shows a third embodiment of the present invention. In this example, the second
As in the embodiment, the shaft portion 56 of the 31 grinding tools has the same structure as the shaft portion 36 in the first embodiment. In addition, in this embodiment, the axis of the spindle 41 and the grinding tool 3
Holes 70 and 71 that communicate with each other are provided at the axes of the holes 7 and 7.
A push rod 72, which is driven up and down by a drive device (not shown), is installed within the 0.71 mm. Further, in this embodiment, the groove 50 in the first embodiment is formed on the ring member 38 side. Reference numeral 73 indicates a workpiece (lens). The rest of the configuration is the same as that of the second embodiment, so the same reference numerals are given to the same components as those shown in FIG. 3, and the explanation thereof will be omitted.

According to the configuration of this embodiment described above, there are the following effects.

That is, as the grinding process progresses, the processed surface 7 of the workpiece 73
3a and the grinding surface 55a of the grinding tool 3J increases, and for this reason, in the past, the workpiece 73 was
However, according to this embodiment, it is possible to easily unscrew the M by moving the push rod 72 upward.

Note that during machining, it goes without saying that the pushbutton 72 is moved below the grinding surface 55a. Further, in this embodiment, the grinding fluid can be supplied even if a mechanism other than the grinding fluid supply is incorporated inside the spindle 41. Other functions and effects are the same as those in the first embodiment, so their explanation will be omitted.

(Fourth Embodiment) FIG. 5 shows a fourth embodiment of the present invention. This example shows a configuration example in which the grinding tool 31 is mounted on the lower end of the spindle 41.

A hole 80 is formed in the axis of the spindle 41, and a pull rod 81 that can be moved up and down via a drive device (not shown) is installed inside the hole 80. A pulling portion 8 formed at the inner end of the grinding tool 31 is provided at the tip of the pulling rod 81.
2 is provided with a locking claw 83 for detachably holding it. Tc: 1 part of the spindle 41 includes the shaft part 56 of the grinding tool 31
A tapered hole 85 corresponding to the tapered surface 84 is formed.

A groove-like step portion 86 is provided around the circumference of the tapered hole 85 , and this step portion 86 is connected to the grinding fluid introduction portion 37 through a hole 87 .
It is a communication. Further, the stepped portion 86 communicates with the communication hole 46 of the grinding tool 31 via the second passage 35.

At the lower end of the spindle 41, a flange member 8 for controlling the lower part of the ring member 38 is removably attached. The other configurations are the same as in the first embodiment.

In the above configuration, the pull rod 81 is lowered, the grinding tool 31 is chucked by locking the pull portion 82 and the locking pawl 83, and the grinding tool 31 is moved into the spindle by moving the pull rod 81 upward. Fixed at 41.

The flow, action, and effect of the grinding fluid are the same as those in the first embodiment, so their explanation will be omitted. However, according to this embodiment, the flow of the grinding fluid is directed downward). In particular, in this case, since the grinding fluid is supplied from above, there is an advantage that there is no loss of potential energy tJl.

(Fifth Embodiment) FIG. 6 shows a fifth embodiment of the present invention. The feature of this embodiment is that grooves 90 and 91 are provided around the axis at the upper and lower parts of the grinding fluid introduction part 37 in the spindle 41, and grooves 90 and 91 are provided at positions corresponding to the parts 909) in the ring member 3B. 9 and 93 are installed on the same hill so that fluid such as air can be supplied at a predetermined pressure to the nitrogen space between each 114 part 90.92 and 91.93 via a hose 94. This is the point that was constructed.

The rest of the configuration is the same as that shown in FIG. 1, so the explanation thereof will be omitted.

First, a fluid such as air is supplied between the ring member 38 and the spindle 41 through the hose 94 at a predetermined pressure, and the supplied fluid accumulates in the space between the grooves 90, 92 and 0193, and the spin 1 ru between the ring member 41 and the ring member 38
It flows out from the gap.

On the other hand, the grinding fluid is pumped through the hose 39 at a predetermined pressure. The pumped grinding fluid is introduced into the grinding fluid introduction section 37,
Second passage 35. The powder is supplied through the first passage 33 to a grinding section of a grinding tool (not shown).

In this case, by appropriately adjusting the pressure of the fluid supplied from the hose 94 and the pressure of the grinding fluid supplied from the hose 39, the fluid flows out from the gap between the ring member 38 and the spindle 41 due to the sealing effect of the fluid. This has the advantage that the amount of grinding fluid to be used can be suppressed, and the grinding fluid can be efficiently supplied to the grinding section.

Note that the tf5 configuration of the second passage 35 in each of the above embodiments may be configured as shown in FIGS. 7a, b, and c. That is, FIG. 7a shows that when four second passages 35 are provided,
In No. 71211b, a recess 96 having a triangular planar cross section is formed on the outer periphery of the rotating shaft portion 36 (see FIG. 2), the grinding tool 31, or the spindle 41, and a hole 97. When supplying to the first passage 33 via the second passage 35, FIG. 7C shows a case where the second passage 35 is formed in a spiral shape.

This configuration has the advantage that the grinding fluid can be supplied efficiently.

〔Effect of the invention〕

As described above, according to the device according to claim 1 of the present invention,
Due to the action of some of the liquid supplied between the rotating shaft and the non-rotating ring member, there is almost no direct contact between the rotating shaft and the ring member, so wear on the sliding surfaces can be suppressed. This can significantly extend the life of the device. In addition, since the structure is simpler and there are fewer parts than conventional low joints, the cost can be significantly reduced.

Further, according to the device according to claim 1, the sealing effect of the fluid supplied from the fluid introduction part can suppress the buildup of the grinding fluid flowing out from the gap between the ring member and the rotating shaft,
Grinding fluid can be efficiently supplied toward the grinding section.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram of the device according to the present invention, FIG. 2 is a front sectional view showing the first implementation of the device according to the present invention, FIGS. 3, 4, 5, and 6. The figure shows the third, third, and third parts of the apparatus according to the present invention. 4th. and a front sectional view showing the fifth embodiment, FIGS.
9, FIG. 8, FIG. 9, and FIG. 10 are explanatory diagrams of the prior art. 31... Grinding tool 32... Outlet 33... First passage 34... Inlet 35... Second passage 36... Rotating shaft section 37... Grinding fluid introduction section 38... -Ring member 39--Hose Fig. 39... Hose Fig. Fig. Fig. n Fig. n

Claims (2)

[Claims] (1) A first passage having an outlet for the grinding fluid in the direction of the machining surface of the grinding tool is provided inside the rotating shaft, and an inlet for the grinding fluid is provided on the outer periphery of the rotating shaft; A second passage communicating with the passage is provided, a ring member equipped with a grinding fluid supply part is loosely fitted to the shaft part, and an inlet of the second passage is provided between the shaft part and the ring member. A grinding fluid supply device characterized in that it is configured by providing a grinding fluid introduction section that communicates with the grinding fluid introduction section. (2) The grinding fluid supply device according to claim 1, wherein at least one fluid introduction portion is formed in the axial direction of the grinding fluid introduction portion in the ring member.