JP2003127062A - Dressing method and dressing device for diamond wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in the conventional dressing method of a diamond wheel using fixed particles that diamond grains are worm and dulled simultaneously with dressing. SOLUTION: The dressing method and the dressing device for the diamond wheel are to remove binders from the diamond wheel by immersing the diamond wheel turning at a peripheral velocity of 3400-5400 m/min in a mixed liquid of an abrasive and a grinding liquid or by spraying the mixed liquid onto the diamond wheel turning at a high-speed to make the abrasive hit against the face to be dressed of the diamond wheel at a high-speed. A good dressing shape can be formed under the different binder removal conditions at the front and back in the turning direction due to different hitting powers to the faces to be dressed at the front and back in the turning direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of dressing a diamond grindstone used for grinding and cutting.

[0002]

2. Description of the Related Art In grinding and cutting with a diamond grindstone, phenomena such as increase in grinding resistance and baking of a work occur due to clogging and crushing of the diamond grindstone as the machining progresses. Processing speed and processing quality are reduced. With respect to a diamond grindstone in which such clogging or crushing has occurred, dressing of the grindstone is performed in order to recover the cutting of the diamond grindstone, prevent deterioration of processing quality, and perform processing at a stable processing speed.

As this dressing method, conventionally, there are methods such as rotary dressing and stick dressing, which are generally carried out using a GC (green carborundum) grindstone or the like. Further, as a method that does not use a GC grindstone, there is an electrolytic dressing method. This electrolytic dressing method is a method in which the diamond grindstone is dressed in an electrolytic solution by energizing the diamond grindstone.

[0004] A grindstone is formed by immersing a grindstone in a mixture of an abrasive and a polishing liquid under ultrasonic waves and causing the abrasive particles in motion to collide with the grindstone by the ultrasonic waves in the mixture. The dressing method is disclosed in JP-A-6-55440.

[0005]

In methods such as rotary dress and stick dress, the truing (molding) effect of the diamond grindstone is great, but since fixed abrasive grains are used for the dress, the dressing is performed at the same time as the diamond abrasive grain particles. Also wears and causes blindness. As a result, the dressed portion and the blind portion are present on the grinding surface of the diamond grindstone, and the dressing effect is reduced.

Further, in the electrolytic dressing method, it is necessary to add electrodes or the like so that the diamond grindstone can be energized.
A separate power supply for energizing is required. And p of electrolyte
H adjustment is required, management is not easy, and the device is expensive. Therefore, there is a demand for a dressing method that is inexpensive and can be easily dressed, and that has a high dressing effect.

In a dressing method in which a grindstone is dipped in a mixed solution of an abrasive and a polishing solution, and ultrasonic particles in the mixed solution collide abrasive particles in motion with the grindstone, collision energy is small and the dressing work takes a long time. At the same time, the binder on the surface of the blade is only removed uniformly, it has no directionality, and it is not possible to dress the abrasive particles in the required dressing shape.

[0008]

In order to achieve the above object, the present invention is to immerse a rotating diamond grindstone in a mixed liquid of an abrasive and a polishing liquid, or a mixed liquid of an abrasive and a polishing liquid. It is a method of dressing a diamond grindstone by spraying. Peripheral speed 3400m / min-5400m
Abrasive particles collide with the diamond grindstone rotating at a speed of / min at a high speed, and only the soft binder portion on the surface of the diamond grindstone is removed. However, the diamond abrasive grains are not removed, and the abrasive grains hardly wear. Further, since the binder is removed by the abrasive agent colliding with the diamond grindstone rotating at a high peripheral speed, the removal amount of the binder of the diamond abrasive grains is different before and after the rotating direction. For this reason, the blade surface of the diamond grindstone is finished in a good dressing state. Also,
In the dressing method according to the present invention, the outer peripheral surface and the side surface of the diamond grindstone can be dressed at the same time.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a sectional view seen from the front side of a method for dressing a diamond grindstone 1 according to the first embodiment of the present invention, and FIG. 2 is a sectional view seen from the same side direction. The mixed liquid 3 of the abrasive and the polishing liquid is put in a mixed liquid tank 4 and stirred by a stirring plate 5 so that the abrasive is not precipitated or separated. Here, the abrasive has an average particle size of about 3 μm (#
4000) GC (green carborundum) abrasive grains,
Pure water was used as the polishing liquid. The diamond particle diameter of the grindstone varies depending on the type of blade, but the average particle diameter is about 6 to 20 μm (# 500 to # 2000).
The diamond grindstone 1 to be dressed is sandwiched between the grindstone flanges 2, and the spindle motor 7 and rotary shaft 6 are used to
Rotate at 000 rpm and the peripheral speed is 4500 m / min
To reach. After that, the diamond grindstone 1 is immersed in the mixed liquid 3 up to the vicinity of the grindstone flange 2, and this state is maintained for several minutes to perform dressing work. The abrasive in the mixed liquid 3 collides with the grindstone blade rotating at a high speed at the peripheral speed,
As a result, the bonding material 10 which is the soft part of the dressed surface
Are removed.

FIGS. 4 and 5 are cross-sectional views of the blade portion of the diamond grindstone before and after dressing, as viewed from the radial direction. As shown in FIG. 4, before the dressing, the diamond abrasive grains 11 are filled with the binder due to clogging and crushing, but as shown in FIG. 5, the diamond abrasive grains are exposed after the dressing, and the diamond abrasive grains are exposed. Blindness of No has happened. FIG. 6 is a cross-sectional view seen from the side surface of the blade of the diamond grindstone after dressing. Since the grindstone is rotating at a high speed, more binder is removed on the front side in the direction of rotation, and the amount of binder removed on the back side is a dress form with a small amount of binder, and from the aspect of cutting edge and holding of the abrasive grain, good It has a protruding shape of abrasive grains. In other words, during grinding, the front side comes into contact with the object to be ground and performs the grinding process, so the cutting edge is well exposed, and the binding agent on the rear side remains so that the abrasive grains are held firmly. You are in a good dress.

[0012]

[Table 1]

As shown in Table 1, as a result of the experiment, 3400 to 540 is determined from the protruding shape of the abrasive grains and the required dressing time.
A peripheral speed of 0 m / min is preferred. When the diameter of the diamond grindstone is 72 mm, these peripheral velocities become 15,000 to 24,000 rpm when converted into the number of revolutions. In addition,
When the peripheral velocity is less than 3400 m / min, the impact force of the abrasive on the dressed surface becomes small, the dressing speed becomes slow, and the dress shape is symmetrical before and after the abrasive grains, and the sharpening state is insufficient. is there. Also, the peripheral speed is 540
If it exceeds 0 m / min, the abrasive grains are likely to fall off the blade, and at the same time, the rotational speed of the spindle motor approaches the limit, and a stable rotational speed cannot be obtained.

(Second Embodiment) FIG. 3 is a cross-sectional view of a diamond grindstone dressing device according to a second embodiment of the present invention as seen from the front side. The diamond grindstone 1 is sandwiched between the grindstone flanges 2, and is rotated at a high speed by the spindle motor 7 at 20000 rpm through the rotary shaft 6.
The peripheral speed is 4500 m / min. Further, the mixed liquid 3 of the abrasive and the polishing liquid was put into the mixed liquid tank 4 and stirred by the stirring plate 5 so that the abrasive was not precipitated or separated. Here, GC abrasive grains of about 3 microns were used as the polishing agent, and pure water was used as the polishing liquid. A dressing operation is performed by spraying the mixed liquid through a pump 8 and a jet nozzle 9 onto a diamond grindstone that is rotating at a high speed for several minutes. By setting the spraying angle in the lying direction with respect to the dressed surface and in the direction facing the rotation of the grindstone, the effective dressing work can be performed in the shortest time.

FIG. 6 is a sectional view of the diamond grindstone as seen from the side surface of the blade after dressing. The grindstone is rotating at a high speed, and the mixed liquid sprayed from the spray nozzle collides in the direction opposite to the peripheral speed of the blade. Compared to the first embodiment, in the present embodiment, since the abrasives collide with the dressed surface in the same direction, more binder is removed in a shorter time and on the front side in the rotation direction. On the rear side, the dressing shape is such that the amount of the binder removed is small, and the cutting edge of the abrasive grains and the holding surface are in a good protruding form. In other words, during grinding, the front side comes into contact with the object to be ground and performs the grinding process, so that the protruding form is in a state in which the cutting edge is well projected, and the binding agent on the rear side leaves the abrasive grains. Good retention and good dress shape.

In the dressing method according to the present embodiment, the dressing operation can be performed without removing the grindstone blade by providing the dressing injection nozzle in the grinding machine, the dicing saw, or the like. You can increase the rate.

In addition to spraying the abrasive from the injection nozzle to the dressed surface which is the blade portion of the diamond grindstone according to this embodiment, in addition to the dressed surface of the blade portion rotating at high speed according to the first embodiment, By causing the abrasives in the mixed liquid 3 to collide with each other, the dressing work can be further performed in a short time.

[0018]

According to the dressing method of the present invention as described above, the particles of the abrasive collide with the diamond grindstone at high speed when the diamond grindstone rotates at high speed, and the binder, which is the soft part of the grindstone, is removed. However, hard diamond abrasive grains are hardly removed and remain.

Further, since the abrasive particles are suspended in the mixed solution, the binder is removed even when the abrasive particles collide with the diamond particles, but the diamond particles are hardly worn, and no clogging occurs. I can dress.

[Brief description of drawings]

FIG. 1 is a sectional view of a dressing method according to a first embodiment of the present invention as seen from the front direction.

FIG. 2 is a sectional view of the dressing method according to the first embodiment of the present invention viewed from a side direction.

FIG. 3 is a sectional view of the dressing device according to the second embodiment of the present invention as seen from the front direction.

FIG. 4 is a cross-sectional view of the outer peripheral portion of the diamond grindstone before dressing as seen from the blade radial direction.

FIG. 5 is a cross-sectional view of the outer peripheral portion of the diamond grindstone after dressing as seen from the blade radial direction.

FIG. 6 is a cross-sectional view of the abrasive grains and the binder in a good state as seen from the side surface of the diamond grindstone blade.

[Explanation of symbols]

1 diamond whetstone 2 grindstone flange 3 Mixed liquid of abrasive and polishing liquid 4 mixed liquid tank 5 stirring plate 6 Wheel rotation axis 7 Spindle motor 8 pumps 9 injection nozzles 10 Binder 11 diamond grains

Claims (6)

[Claims] 1. A dressing surface of a disk-shaped diamond grindstone in which diamond abrasive grains are bonded with a binder is dipped in a mixed solution of an abrasive and a polishing solution contained in a container to form a disk-shaped diamond grindstone. Peripheral speed is 3400m / min-5
A method for dressing a diamond grindstone, which comprises rotating particles at a rotation speed of 400 m / min to cause the particles of the abrasive to collide with the dressed surface to remove the binder on the surface. 2. The method for dressing a diamond grindstone according to claim 1, wherein the mixed solution is stirred in a container equipped with a stirring mechanism so that the polishing agent does not precipitate and separate. 3. A mixture of an abrasive and a polishing liquid is sprayed from the spray nozzle in a direction in which the spray nozzle sprays the surface to be dressed and in a direction opposite to the rotation of the grindstone. A method of dressing a diamond grindstone, characterized in that the binder on the dressed surface is removed. 4. A mixed liquid of an abrasive and a polishing liquid contained in a container,
The dressed surface of a diamond grindstone in which diamond abrasive grains are bonded with a binder is immersed, and the peripheral speed of the disk-shaped diamond grindstone is 3400 m / min to 5400 m / mi.
The method for dressing a diamond grindstone according to claim 3, wherein the dressing method is performed by rotating at a rotation speed such that n. 5. A dressing form in which a larger amount of binder is removed on the front side in the rotational direction and a smaller amount of the binder is removed on the rear side because the collision impact force applied to the dressed surface differs before and after the rotational direction. A diamond grindstone characterized by being present. 6. A mixed liquid comprising an abrasive and a polishing liquid, a container for the mixed liquid, a stirring plate, a rotating mechanism, a pump, an injection nozzle, and a pump for pumping the mixed liquid stirred by the stirring plate, A dressing device for a diamond grindstone, characterized by spraying the dressed surface of the diamond grindstone rotated by a rotating mechanism through an injection nozzle in a lying direction and in a direction opposite to the rotation of the grindstone.