JPH0749183B2 - Grinding tool device with electrode - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding tool device with electrodes for dressing a grinding wheel by utilizing an electrolysis phenomenon.

[0002]

2. Description of the Related Art For example, a grinding grindstone is used for grinding a high hardness material, and the clogging of the grinding grindstone occurs on the outer peripheral surface of the grinding grindstone during use. In order to remove it, dressing of the grinding wheel is necessary. As one of the dressings, electrolytic dressing grinding utilizing an electrolysis phenomenon is disclosed in, for example, JP-A-63-
It is known as shown in Japanese Patent No. 283861.

In this electrolytic dressing grinding, the other electrode body is arranged so as to face a grinding wheel which also serves as one electrode, and the main body is rotated to rotate the grinding wheel integral with a tool holder attached to the main shaft. At the same time, the grinding liquid is supplied from the coolant nozzle to the outer peripheral surface of the grinding wheel, and the grinding liquid is spread over the entire outer surface of the grinding wheel, and the grinding wheel is also used as one of the electrodes. Between the other electrode body,
The electric discharge is performed through the grinding liquid to electrolytically elute the grinding dust on the outer peripheral surface of the grinding wheel, thereby preventing the grinding wheel from being clogged.

[0004]

In the conventional electrolytic dressing grinding, the outer peripheral surface of the grinding wheel is satisfactorily held by electrolysis, and high efficiency and mirror surface processing are possible. It is necessary to accurately set the position of the electrode and the coolant nozzle with respect to the outer peripheral surface of the grindstone.Therefore, when replacing the grinding grindstone in use with another grindstone, the grindstone mounted on the tool holder again On the other hand, the electrodes and the coolant nozzles had to be repositioned at appropriate positions, and the setup work when replacing the grinding wheel was troublesome.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a grinding tool device with an electrode, which can simplify the setup work when exchanging a grinding wheel. is there.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a tool holder having a base end side detachable from a spindle of a grinding machine, a grinding wheel fixed to a tip of the tool holder and also used as one electrode, and a tool holder. Along the way, a cylindrical block member having a base end side detachably attached to the spindle head and relatively rotatable with respect to the tool holder, and a distal end side of the cylindrical block member, with respect to a grinding wheel side The other electrode body, which is insulated and provided with a predetermined gap from the outer peripheral surface of the grinding wheel, is provided on the tip side of the cylindrical block member at a position separated from the outer peripheral surface of the grinding wheel by a predetermined clearance. It is characterized by being composed of a coolant nozzle.

[0007]

According to the present invention, when the grinding machine is used, the rotation of the main spindle causes the grinding wheel integrated with the tool holder attached to the main spindle to rotate, and the work is ground. At the same time, the coolant is supplied from the coolant nozzle to the outer peripheral surface of the grinding wheel so that the grinding fluid is spread over the entire outer peripheral surface of the grinding wheel. Then, between the grinding whetstone that also serves as one electrode and the other electrode body, discharge is performed through the grinding liquid, and the grinding debris on the outer peripheral surface of the grinding whetstone is electrolytically eluted, causing clogging of the grinding whetstone. Is prevented.

While the grinding wheel is rotated by the tool holder, the cylindrical block member fixed to the spindle head is stationary, so that the other electrode body and coolant nozzle provided on the block member are also stationary. The gap between the other electrode body and the grinding wheel that also serves as one electrode is kept at a predetermined interval, and the above-described electrolytic action is normally performed.

Further, when the grinding wheel used is replaced with another grinding wheel, the tool holder is removed from the spindle, and at the same time, the tubular block member integral with the tool holder is removed from the spindle head, and the tubular block is removed. The other electrode body integral with the member and the coolant nozzle are also removed at the same time.

To replace another grinding wheel with a grinding machine,
If the tool holder is attached to the spindle, the cylindrical block member is also attached to the spindle head at the same time, and the other electrode body and the coolant nozzle are secured in advance at the proper position for the grinding wheel. It is not necessary to set the other electrode body at the proper position, nor is it necessary to set the coolant nozzle at the proper position.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a grinding tool device with electrodes according to a first embodiment of the present invention. Here, as the material of the parts shown below, metal is used for parts other than the insulator, but the description thereof is omitted.

In the figure, 1 is a spindle head of a grinding machine,
Reference numeral 2 is a main spindle rotatably attached to the main spindle head 1, and 3 is a tool holder. The tool holder 3 has a tool adapter 3A and a flange 3D having a V groove 3C formed on the base end side thereof, and the tool adapter 3A can be mounted or dismounted in the tapered hole 2A of the main spindle 2 in a fitted state. It has a structure. The spindle head 1 is provided with a first grinding fluid supply passage 1A.

A first concave member 4 is fixedly attached to the end face 1B of the spindle head 1 via a first insulator 5, and a second concave member 6 is fixed to the end face 1B via a second insulator 7. Installed. The second concave member 6 includes a spindle head 1A
6A is formed to communicate with the first grinding fluid supply path 1A.

Reference numeral 8 is a power source, and its negative terminal 8A is a wiring 9A.
And the positive electrode terminal 8B is connected to the second concave member 6 via the wiring 9B.

The tool holder 3 has a holder main body 3B made of a solid rod coaxial with the tool adapter 3A, and the tip of the holder main body 3B has abrasive grains provided on the disk 10A and its outer peripheral surface 10B. A grinding wheel 10 made of a member is fixed, and this grinding wheel 10 also serves as one electrode.

Two bearings 11 are externally provided on the outer peripheral surface of the holder body 3B of the tool holder 3, and a thick cylindrical block member 12 is provided with respect to the holder body 3B via these bearings 11 (two pieces). It is fitted so that it can rotate relative to it. It is fitted on the rudder main body 3B so as to be rotatable relative thereto.

At the base end side of the cylindrical block member 12, there are provided a mounting portion composed of a protruding body 12A and a mounting portion composed of a protruding body 12B. The protrusions 12A and 12B can be fixedly attached to and removed from the first concave member 4 and the second concave member 6 of the spindle head 1, respectively. A slip ring 13 is embedded in the tubular block member 12 of the holder main body 3B and is attached to the tool holder 3 so as to be rotatable relative to the tool holder 3. Furthermore, the third insulator 1 is provided in the tubular block member 12.
4 is fitted and a second grinding fluid supply path 12D is formed along the axial direction. One end of the grinding fluid second supply path 12D is opened at the tip of the protrusion 12B, and the hole 6A of the second concave member 6 is formed.
It is designed to communicate with.

An electrode supporting portion 12C is formed on one side of the cylindrical block member 12, and an electrode body 15 is provided on the electrode supporting portion 12C so as to correspond to the protruding body 12A. It is located with a predetermined gap from the outer peripheral surface 10B of the grindstone 10. In addition, the tubular block member 12
On the other side, a grinding liquid supply pipe 16 communicating with the grinding liquid second supply passage 12D is provided, and a coolant nozzle 16A is provided in the grinding liquid supply pipe 16 at a fixed position with respect to the electrode body 15. . The tip of the coolant nozzle 16A has a predetermined gap from the outer peripheral surface 10B of the grinding wheel 10 and a wiring 18A is embedded in the separating member 12 from the electrode body 15 to the projection 12A, and the slip ring 13 is formed.
The wiring 18B is embedded from the to the protrusion 12B.

Therefore, the grinding tool device with the electrode is
The tool holder 3 is mounted on a tool storage magazine (not shown) installed on the side of the grinding tool machine, and when necessary, the tool holder 3 holds the V groove 3C of the flange 3D by the tool exchange arm or the like. The spindle head 1 is conveyed to the front of the spindle 2, and thereafter, the tool holder 3 is attached to the spindle 2 for use.

In this case, the main spindle 2 is stopped at a predetermined angular position, the key of the main spindle 2 and the key groove of the tool holder 3 held by the tool exchanging arm are aligned, and the cylindrical block is formed. The protrusions 12A, 12 of the member 12
B matches the positions of the first and second concave members 4, 6 of the spindle head 1, and the tubular block member 12 is positioned and fixed to the spindle head 1.

Next, the tool holder 3 is rotated by the rotation of the spindle 2.
The grinding wheel 10 that is integral with the machine rotates to grind the work. At the same time, the grinding fluid flows from the supply source to the grinding fluid first supply passage 1A of the spindle head 1, the hole 6A of the second concave member 6, the grinding fluid second supply passage 12D of the cylindrical block member 12, and the grinding fluid supply pipe 16. The coolant reaches the coolant nozzle 16A through the tip of the coolant nozzle 16A and is supplied to the vicinity of the space between the outer peripheral surface 10B of the grinding wheel 10 and the workpiece, and reaches the entire surface of the outer peripheral surface 10B of the grinding wheel 10. The positive electrode terminal 8B of the power source 8 is connected to the outer peripheral surface 10B of the grinding wheel 10 via the wiring 9B, the second concave member 6, the wiring 18B in the tubular block member 12, the slip ring 13, and the holder body 3B of the tool holder 3. Electrically connected to. On the other hand, the negative electrode terminal 8A of the power source 8 is electrically connected to the electrode body 15 via the wiring 9A, the first concave member 4, and the wiring 18A in the tubular block member 12. In the tubular block member 12, the positive electrode terminal 8B side and the negative electrode terminal 8A side are insulated from each other by the third insulator 14.

In this state, when the power source 8 is turned on, electric discharge is generated through the grinding fluid between the grinding wheel 10 that also serves as one electrode and the electrode body 15, and the grinding wheel 10 is discharged. The grinding debris on the outer peripheral surface 10B is electrolyzed and the clogging of the grinding wheel 10 is prevented.

Then, the grinding wheel 10 is moved by the tool holder 3.
While the cylindrical block member 12 fixed to the spindle head 1 is stationary, the electrode body 15 integrated with the cylindrical block member 12 is also stationary, and the electrode body 15 and one of the electrodes are rotated. The gap between the grinding wheel 10 and the grinding wheel 10 is also maintained at a predetermined interval, and the above-described electrolytic action is normally performed.

Further, when the grinding wheel 10 used in the grinding tool device with an electrode is to be replaced with another grinding wheel 10 having the same size or different size, the tool holder 3 is rotated by the tool changing arm or the like. 2 taper hole 2A
At the same time, the tubular block member 12 is removed from the spindle head 1, the electrode body 15 and the coolant nozzle 16A together with the grinding wheel 10 are removed at the same time as shown in FIG. 1, and then they are stored in the tool magazine. It

In order to attach another grinding wheel 10 to the grinding machine, the grinding wheel 10 relating to another electrode-equipped grinding tool device is used.
With respect to the electrode body 15 and the coolant nozzle 16
It is necessary to place A at the proper position, but with the tool holder 3, the electrode body 15, the coolant nozzle 16
A, since the grinding wheel 10 has a structure integrally assembled in advance, when the tool holder 3 is attached to the spindle 2 when exchanging the grinding wheel 10, the cylindrical block member 1 is
Two protrusions 12A and 12B are attached to the first concave member 4 and the second concave member 6 of the spindle head 1, and the grinding wheel 10
Since the positions of the electrode body 15 and the coolant nozzle 16A with respect to the outer peripheral surface 10B are secured in advance at regular positions, it is not necessary to set the electrode body 15 at the regular position with respect to the grinding wheel 10 at the time of replacement, It is not necessary to adjust the position of the coolant nozzle 16A.

According to the above construction, the grinding wheel 10 also serving as one of the electrodes, the electrode body 15 and the coolant nozzle 16A are integrally formed in a relatively rotatable structure. When exchanging, it is not necessary to position the electrode body 15 and the coolant nozzle 16A at a predetermined gap according to the shape and size of the grinding wheel 10 each time, and the setup work for exchanging the grinding wheel 10 can be simplified. it can.

In this embodiment, in order to insulate the wiring 18A and the wiring 18B, the tubular block member 12 is formed.
Although the third insulator 14 is fitted inside, the entire tubular block member 12 can be made of an insulator.

FIG. 2 shows a grinding tool device with an electrode according to a second embodiment of the present invention. The grinding tool device with an electrode according to the second embodiment has basically the same configuration as the grinding tool device with an electrode according to the first embodiment, but only different portions will be described. The same components as those in the first embodiment are designated by the same reference numerals. Further, as a material of the parts shown below, metal is used for parts other than the insulator, but the description thereof will be omitted.

In the figure, a main spindle 2 is rotatably mounted on a main spindle head 1 of a grinding machine, is relatively rotatably fitted onto the main spindle 2, and has a main spindle head end surface member 21 having a first gear 21A on its outer peripheral surface. It is rotatably supported at the end of the head 1. The second gear 22 meshes with the first gear 21A,
The second gear 22 is attached to the tip of a shaft portion 23A of a servo motor 23 attached to the spindle head 1. The first concave member 4 is provided on the front end surface 21B of the spindle head end surface member 21.
Is fixedly attached via the first insulator 5, and
The second concave member 6 is fixedly attached.

According to the second embodiment, as shown in FIGS. 2 and 3, the spindle head 1 is moved (indicated by the arrow X) along the contour W1 of the work W of the grinding wheel 10. ,
By controlling the rotation angle of the servo motor 23 to rotate the spindle head end surface member 21 by an appropriate angle, the electrode body 15 and the coolant nozzle 16A can be rotated to arbitrary positions with respect to the grinding wheel 10, and a complicated contour can be obtained. Since the electrode body 15 and the coolant nozzle 16A can be constantly moved to a position where they do not interfere with the work W in the shape of the work W, contour processing can be performed without changing the setup.

[0032]

As described above, when the grinding tool device with an electrode in use is to be replaced with another grinding tool device with an electrode, the grinding wheel is integrated with the tool holder and also serves as one electrode. In contrast, the tool holder is provided with a relatively rotatable cylindrical block member provided with the other electrode body and the coolant nozzle, and moreover, the tool holder is mounted on the spindle, and the cylindrical block member is mounted on the spindle head. Even if the other electrode body and the coolant nozzle are integrated with the grindstone, the other electrode body and the coolant nozzle can be held stationary with respect to the rotating grinding wheel.

Accordingly, the positioning of the other electrode body and the coolant nozzle is ensured in advance with respect to the grinding wheel of another grinding tool device with an electrode at a predetermined gap, and at the time of replacement, the other electrode body and the coolant nozzle are ground by the grinding wheel. However, it is not necessary to perform the positioning at a predetermined gap, and it is possible to simplify the setup work when exchanging the grinding wheel.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a grinding tool device with an electrode according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a grinding tool device with electrodes according to a second embodiment of the present invention.

FIG. 3 is an operation state explanatory view showing a processing state of a workpiece of the grinding tool device with electrodes in the second embodiment.

[Explanation of symbols]

 1 Spindle Head 2 Spindle 3 Tool Holder 10 Grinding Wheel 10B Outer Surface 12 Cylindrical Block Member 14 Third Insulator 15 Electrode 16A Coolant Nozzle

Claims (1)

[Claims] 1. A tool holder whose base side is detachably attached to a spindle of a grinding machine, a grinding wheel which is fixed to the tip of the tool holder and also serves as one of the electrodes, and the base side is attached to the spindle in the middle of the tool holder. A cylindrical block member that is detachably attached to the head and is rotatable relative to the tool holder, and a tip end side of the cylindrical block member is insulated from the grinding wheel side and an outer peripheral surface of the grinding wheel. And the other electrode body provided via a predetermined gap, and a coolant nozzle provided on the tip side of the cylindrical block member at a position separated from the outer peripheral surface of the grinding wheel by a predetermined gap. A grinding tool device with an electrode characterized by the above.