JP2007307621A - Truing and dressing method of super-abrasive grain wire saw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-efficiency, high-accuracy truing method and a dressing method for a super-abrasive grain wire saw. <P>SOLUTION: The super-abrasive grain wire saw is subjected to a truing process or a truing/dressing process while it travels in contact with the surface of a whetstone rotating. Therein the speed difference at the contacting point between the whetstone and the wire saw should be between 50-3,000 m/min, including the limits. The peripheral velocity of the whetstone should preferably be between 50-3,000 m/min, including the limits. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to truing of a superabrasive wire saw and truing dressing.

As a superabrasive wire saw, a superabrasive wire saw in which superabrasive grains are fixed to a core wire with a binder is known. This superabrasive wire saw has a very good sharpness. Furthermore, since a water-soluble or water-insoluble grinding fluid is used, the machine and its surroundings can be reduced, and the working environment can be improved. Since a super-abrasive wire saw with a length of several kilometers or more can be manufactured, a large number of wafers can be sliced at once, compared to the free-abrasive multi-wire saw method using slurry. A cutting speed several times or more can be obtained. A superabrasive wire saw uses, for example, a material made of polyethylene, nylon, polyester, or a material reinforced with glass fiber or carbon fiber as a core wire, and superabrasive abrasive grains are bonded to the outer periphery of the core wire by a synthetic resin. It is fixed by an agent or electrodeposition.
(For example, see Patent Document 1)

As another superabrasive wire saw, a monofilament or multifilament such as carbon fiber, aramid fiber, alumina fiber, boron fiber, silicon carbide fiber, or silicon-titanium-carbon-oxygen-based inorganic fiber is used as a core wire, and the outer periphery of this core wire Superabrasive grains are fixed by plating or resin.
(For example, see Patent Document 2)

To dress a superabrasive wire saw, it is known to press a dressing stone against the superabrasive wire saw.
(For example, see Patent Document 3)

Further, as a method of dressing a superabrasive wire saw, it is known to press a GC grindstone against the superabrasive wire saw.
(For example, see Patent Document 4)

Furthermore, there is known a dressing method for a superabrasive wire saw in which a pipe-like superabrasive layer called beads is fixed to a core wire used for cutting stone, concrete or the like at a predetermined pitch. As shown in FIGS. 8 and 9, the rotating grindstone is dressed in a spiral shape by bringing the endless superabrasive wire saw into contact with the torsional force while rotating.
(For example, see Non-Patent Document 5)
Japanese Patent Laid-Open No. 8-126953 JP-A-9-155631 JP-A-11-28654 JP 2000-158319 A Dr. Fritsch HP, superabrasive wire saw dressing device, SAM150, etc. [searched May 11, 2006], Internet <URL http://www.dr-fritsch.de/e_menue.htm>

  However, the conventional method described above has a problem that the superabrasive wire saw cannot be sufficiently dressed. In addition, there was a problem that truing was hardly possible. The present invention has been made to solve these problems.

The present invention is a method of truing or truing dressing a superabrasive wire saw by running the surface of a rotating grindstone in contact with a superabrasive wire saw, the contact point between the grindstone and the superabrasive wire saw A truing / dressing method for a superabrasive wire saw, characterized in that the difference in speed is 50 m / min or more and 3000 m / min or less. Needless to say, only truing can be performed by setting the conditions, only dressing can be performed, and truing and dressing can be performed simultaneously.
Here, truing is to make the cross-sectional shape of the superabrasive wire saw as close to a perfect circle as possible. More specifically, the superabrasive wire saw has a superabrasive layer in which superabrasive grains are fixed to the surface of the core wire with a binder. The superabrasive layer of the superabrasive wire saw is ground with a grindstone, and in the cross section of the superabrasive layer perpendicular to the longitudinal direction of the superabrasive wire saw, the protruding end of the superabrasive grain becomes a perfect circle as shown in FIG. It is to arrange to form.
And dressing is removing the binding material and clogging of a superabrasive grain layer, making superabrasive grain protrude, and restoring sharpness. In particular, when nickel-coated abrasive grains or the like are used, it is necessary to remove the nickel coating to expose the tip of the abrasive grains and to align the protruding ends of the superabrasive grains so as to form a perfect circle.
Here, the speed difference at the contact point between the grindstone and the superabrasive wire saw was limited to 50 m / min or more and 3000 m / min or less. If the speed difference was less than 50 m / min, the speed difference was insufficient and truing dressing was sufficiently performed. This is because if it exceeds 3000 m / min, the surface of the superabrasive wire saw generates grinding burn, and the performance of the superabrasive wire saw is remarkably deteriorated.
The speed difference is more preferably 100 m / min or more and 2500 m / min or less, and most preferably 200 m / min or more and 2000 m / min or less.

In detail, the present invention is characterized in that the peripheral speed of the grindstone at the contact point is 50 m / min or more and 3000 m / min or less.
The reason why the peripheral speed of the grindstone is limited is that if the speed is less than 50 m / min, the speed difference is insufficient and the truing / dressing cannot be performed sufficiently. If the speed exceeds 3000 m / min, the surface of the superabrasive wire saw is ground and burned. This is to significantly reduce the performance of the superabrasive wire saw.
The peripheral speed of the grindstone is more preferably from 100 m / min to 2000 m / min, and most preferably from 200 m / min to 2000 m / min.

Specifically, the present invention is characterized in that the traveling speed of the superabrasive wire saw is 1 m / min or more and 2000 m / min or less.
The reason for limiting the traveling speed here is that the efficiency of truing and dressing is reduced at less than 1 m / min, and if it exceeds 2000 m / min, it becomes difficult to stably run the superabrasive wire saw. is there.
The higher the running speed, the higher the efficiency of truing / dressing. However, the speed difference at the contact point between the grindstone and the superabrasive wire saw is controlled to be 50 m / min or more and 3000 m / min or less so as not to cause grinding burn.

Specifically, the present invention is characterized in that the tension of the superabrasive wire saw is 5% or more and 70% or less of the breaking strength of the core wire.
The reason why the tension value is limited is that if it is less than 5%, the wire saw will bend and accurate truing / dressing cannot be performed. If it exceeds 70%, the superabrasive layer may be cracked and damaged. Because.
The tension is more preferably 5% or more and 60% or less of the breaking strength of the core wire, and most preferably 10% or more and 50% or less of the breaking strength of the core wire.

More specifically, the present invention is characterized by truing or truing a superabrasive wire saw while forming multiple grooves in a grindstone.
As shown in FIG. 1, it implements, forming many independent groove | channels in a grindstone. When the outer peripheral portion of the grindstone is combed, it is preferable to form the grindstone using a diamond dresser or the like.

More specifically, the present invention is characterized in that the grindstone is truing or truing-dressing the superabrasive wire saw while turning the surface of the superabrasive wire saw with the axis of the superabrasive wire saw as the pivot center. .
As shown in FIG. 5, by rotating the grinding wheel along the surface of the superabrasive wire saw with the axis of the superabrasive wire saw as the center of rotation, the cross-sectional shape of the superabrasive wire saw is more accurately rounded. The effect of making is obtained.

More specifically, the present invention is characterized by truing or truing a superabrasive wire saw while forming a thread-like groove in a grindstone.
As shown in FIG. 6, it is possible to truing or truing a superabrasive wire saw while forming a thread-like groove in the grindstone.

More specifically, the present invention is characterized in that the grindstone is composed of one or more sets of grindstones facing each other, and truing or truing dressing a superabrasive wire saw.
As shown in FIG. 4, it is preferable to use one or more sets of grindstones facing each other so as to sandwich a superabrasive wire saw because high-efficiency and high-accuracy truing dressing is possible. Furthermore, it is most preferable to construct two or more pairs of grindstones facing each other because it enables more efficient and highly accurate truing dressing.

In detail, the present invention is characterized in that about a half circumference of the superabrasive wire saw is in contact with the grindstone.
It is preferable that about a half circumference of the superabrasive wire saw is always in contact with the grindstone. For example, as illustrated in FIG. 1A, the traveling direction of the superabrasive wire saw is made to be orthogonal to the rotation axis of the grindstone 2 and travel while contacting the grindstone.

More specifically, the present invention is characterized in that the superabrasive wire saw is a superabrasive wire saw in which superabrasive grains are fixed to the surface of the core wire with a binder.
The superabrasive wire saw applicable to the present invention is not particularly limited. For example, the core wire can be polyethylene, nylon, glass fiber, carbon fiber, piano wire, and stranded wire thereof. As the superabrasive grain, diamond or CBN can be used depending on the type of workpiece. As the binder, various binders such as resin bond, vitrified bond, metal bond, and nickel plating can be used.

  By using the truing dressing method of the present invention, a superabrasive wire saw can be truing or truing dressing with high efficiency and high accuracy.

  The best mode for carrying out the invention will be described in detail in the following examples. In the following embodiments, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated.

First, the superabrasive wire saw 1 shown in FIGS. 2 and 3 was obtained by the following manufacturing method. Here, FIG. 2 is a schematic view showing an appearance and a partial cross section of the superabrasive wire saw. FIG. 3 is a schematic view showing a cross section of a superabrasive wire saw.
Phenol resin paint, diamond filler 4b having an average particle diameter of 2.6 μm, and nickel-coated diamond abrasive grains 4a having a particle diameter of 40/60 μm are set so that the solid content ratio thereof is 60% by volume, 5% by volume, and 35% by volume. Furthermore, the solvent cresol was added to this mixture to make the amount of the solvent in the paint 50% by volume. Next, this abrasive grain dispersion solution is applied to a copper-plated piano wire 6 having an outer diameter of 0.18 mm (tensile strength of 82.2 N), passed through a die having an inner diameter of 0.28 mm, and then a baking furnace having a furnace temperature of 300 degrees. And baked to cure. A superabrasive wire saw 1 having an outer diameter of 0.24 mm and a resin bond layer thickness of about 20 μm was obtained.

Next, this superabrasive wire saw was subjected to truing dressing by the method shown in FIGS. The conditions at that time are as follows. The peripheral speed of the grindstone 2 was set to 500 m / min, the traveling speed of the superabrasive wire saw was set to 10 m / min, and the tension of the superabrasive wire saw was set to 20% of the breaking strength of the core wire. At the contact point between the superabrasive wire saw and the grindstone, the traveling direction of the superabrasive wire saw and the rotational direction of the grindstone are opposite (that is, upcut), so the speed difference is the sum of 500 m / min and 10 m / min. 510 m / min. ,
As shown in FIG. 1A, the traveling direction of the superabrasive wire saw 1 is orthogonal to the rotational axis of the grindstone 2 and travels while contacting the grindstone. While the superabrasive wire saw was cut into the grindstone with a constant pressing force, truing dressing was performed. Next, as shown in FIG. 1B, grooves were formed in the grindstone, and when the groove depth reached a preset depth, truing dressing was performed while forming the next groove. Furthermore, as shown in FIG. 1C, when the cross section of the grindstone became comb-shaped, the outer periphery of the grindstone was dressed and flattened with a diamond dresser (or diamond rotary dresser) or the like. The truing dressing was continued while repeating the above steps (a) to (c).

FIG. 4 is a perspective view showing a layout of a superabrasive wire saw and a grindstone. A pair of grindstones are placed above and below the superabrasive wire saw, truing dressing is performed on the entire circumference of the superabrasive wire saw, the nickel coating on the superabrasive protrusion is removed, and the superabrasive layer The protruding end of the superabrasive grain formed a perfect circle in the cross section.
When the optical glass was cut using a superabrasive wire saw that had been subjected to this truing and dressing, a sharpness and a high-quality processed surface were obtained. From this result, it was found that the performance of the superabrasive wire saw can be maximized by employing the truing dressing method of the present invention. That is, it was found that the present invention is extremely effective for truing dressing of a superabrasive wire saw. FIG. 7 shows a schematic diagram of a cross section of a truing-dressed superabrasive wire saw.

  Further, as shown in FIG. 5, when the grindstone is truing or truing and dressing the superabrasive wire saw while turning the surface of the superabrasive wire saw with the axis of the superabrasive wire saw as the pivot center, the superabrasive grain The cross-sectional shape of the wire saw was made into a highly accurate perfect circle. This superabrasive wire saw has a better sharpness and an extremely high quality processed surface.

It is a schematic diagram which shows the method of truing or truing dressing, forming many independent groove | channels in the grindstone of this invention. It is a schematic diagram which shows the external appearance and partial cross section of a superabrasive wire saw. It is a schematic diagram which shows sectional drawing of a superabrasive wire saw. It is a perspective view which shows the layout of the superabrasive wire saw of this invention, and a grindstone. FIG. 3 is a schematic view showing a truing or truing dressing method of the grindstone of the present invention while turning the surface of the superabrasive wire saw while turning the surface of the superabrasive wire saw around the axis of the superabrasive wire saw. It is a schematic diagram which shows the method of truing or truing dressing, forming a thread-shaped groove | channel in the grindstone of this invention. It is a schematic diagram of a truing-dressed superabrasive wire saw cross-section. It is a schematic diagram which shows the method of the conventional truing dressing. It is a perspective view of FIG.

Explanation of symbols

1: Super-abrasive wire saw 2: Whetstone 3: Diamond dresser 4a: Abrasive grain 4b: Filler 5: Binder 6: Core wire

Claims (10)

A method of truing or truing a superabrasive wire saw by running a superabrasive wire saw in contact with the surface of a rotating grindstone,
A truing / dressing method for a superabrasive wire saw, wherein a speed difference at a contact point between the grindstone and the superabrasive wire saw is 50 m / min or more and 3000 m / min or less.   2. The truing / dressing method of a superabrasive wire saw according to claim 1, wherein a peripheral speed of the grindstone at the contact point is 50 m / min or more and 3000 m / min or less.   The truing / dressing method for a superabrasive wire saw according to claim 1 or 2, wherein the traveling speed of the superabrasive wire saw is 1 m / min or more and 2000 m / min or less.   The truing / dressing of a superabrasive wire saw according to any one of claims 1 to 3, wherein the tension of the superabrasive wire saw is 5% or more and 70% or less of the breaking strength of the core wire. Method.   The truing of the superabrasive wire saw according to any one of claims 1 to 4, wherein the superabrasive wire saw is truing or truing dressing while forming a multi-groove in the grindstone.・ Dressing method.   The grinding wheel is truing or truing-dressing the superabrasive wire saw while turning the surface of the superabrasive wire saw about the axis of the superabrasive wire saw as a turning center. 6. A truing / dressing method of a superabrasive wire saw according to any one of 5 above.   The truing of a superabrasive wire saw according to any one of claims 1 to 4, wherein the superabrasive wire saw is truing or truing dressing while forming a thread-like groove in the grindstone.・ Dressing method.   The superabrasive according to any one of claims 1 to 7, wherein the grindstone is composed of one or more pairs of grindstones facing each other, and truing or truing dressing a superabrasive wire saw. Truing and dressing method for grain wire saws.   The truing / dressing method for a superabrasive wire saw according to any one of claims 1 to 8, wherein approximately half a circumference of the superabrasive wire saw is in contact with the grindstone.   The superabrasive wire saw according to any one of claims 1 to 9, wherein the superabrasive wire saw is a superabrasive wire saw in which superabrasive grains are fixed to a surface of a core wire with a binder. Truing dressing method.

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