JP3459379B2 - Cup type grinding tool - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cup-type grinding tool capable of high-precision groove bottom machining as an alternative to groove machining by cutting using an end mill or grinding using a grindstone with a shaft, dressing and the like. .

[0002]

2. Description of the Related Art For machining a groove bottom having a width dimension of, for example, 8 mm or less, such as a bottom surface of a narrow groove provided in a scroll compressor, a cutting process by an end mill is generally used. Although high efficiency can be obtained in the cutting of fine grooves by such an end mill, since a small diameter end mill is used, the dimensional accuracy is not always sufficiently obtained due to the significant wear of the tool, and the tool is not damaged. Since it frequently occurs, there are drawbacks such as a decrease in work efficiency and an increase in processing cost. Also, when using a whetstone with a shaft to which a cylindrical grindstone is fixed at the shaft end, the contact area of the tip surface of the cylindrical grindstone during grinding work is large, so the inflow of grinding fluid and chips Is not sufficiently discharged, and grinding burn and tool damage are likely to occur, and the angle between the tip surface and the outer peripheral surface of the cylindrical grindstone part is lost relatively early due to the falling and wear of the abrasive grains. There is a drawback that it is difficult to form a right angle between the inner side wall surface and the bottom surface, and sufficient dimensional accuracy is not always obtained. For example, in the scroll compressor, if the dimensional accuracy of the groove is not sufficiently obtained, the efficiency of the compressor is directly reduced.

On the other hand, as shown in FIGS. 5 and 6 , it is conceivable to construct an electrodeposition grindstone 50 having an outer diameter similar to that of the above-mentioned grindstone with a shaft by using superabrasive grains. This electrodeposition grindstone 50 includes a base metal 56 having a cylindrical large-diameter portion 52 and a cylindrical small-diameter portion 54, and a surface of the cylindrical large-diameter portion 52, that is, a tip end surface, an outer peripheral surface, and an inner peripheral surface, which are super-abrasive. Grains 58 are provided with a grindstone structure fixed by an electrodeposited metal binder 60. The thickness of the cylindrical large-diameter portion 52 at the tip of such an electrodeposition grindstone 50 is, for example, about 1.0 mm. According to the grinding process using the tip end surface 62 of the electrodeposition grindstone 50, the dimensional accuracy of the machining at the groove bottom of the fine groove machining can be obtained, as compared with the end mill or the grindstone with the shaft.

[0004]

However, even in the above-mentioned electrodeposition grindstone 50, since the contact area at the tip face 62 thereof is still large, the inflow of the grinding fluid and the discharge of the cutting chips are not sufficient, so that the grinding burn and the tool damage may occur. It is liable to occur, and since the superabrasive grains are fixed on the tip surface with an electrodeposited metal in a state of being lined in one layer, there is a drawback that a sufficient tool life cannot be obtained yet. There is also a use where the electrodeposited grindstone 50 is used as a dresser for sharpening or truing the grindstone by using its tip end surface, but in this case as well, there is a drawback that a sufficient tool life cannot be obtained.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cup-type grinding tool capable of obtaining a tool life in the case of grooving or dressing using a tip surface. To do.

[0006]

The present inventors have SUMMARY OF THE INVENTION As a result of extensive studies to achieve the above object, abrasive structure which superabrasive grains are bonded by a metal binder that abrasive structure
If a cup-shaped grinding tool is provided at the tip of the cylindrical base metal, a cylindrical grinding part made of a metal backing made of metal that is extremely thin and is integrated with the cylindrical base metal is used. Has a relatively sufficient rigidity necessary for groove bottom polishing and dressing even though it is thin and cylindrical, and the tip surface of the cylindrical grinding part is used for groove bottom polishing and dressing. When used, even if the abrasive grains on the tip surface are consumed or fallen off, the abrasive grains on the lower side appear on the tip surface and can contribute to the grinding action, so that the tool life is preferably improved. Found out. The present invention was made based on such findings.

That is, the gist of the cup-type grinding tool of the present invention is that the cylindrical base metal has a cylindrical grinding portion at one end thereof, and the tip surface of the cylindrical grinding portion is used for grinding. a tool, the cylindrical grinding unit, abrasive structure which superabrasive grains are bonded by a metal binder that the grindstone group
It is made of a material that is thinner than the weave and is lined with a metal that is integral with the cylindrical base metal.

[0008]

Effects of the Invention] In this way, the cylindrical grinding unit abrasive structure which superabrasive grains are bonded by a metal binder that the grindstone
Since it is made of a material that is thinner than the tissue and is lined with a metal that is integral with the cylindrical base metal, a relatively sufficient rigidity necessary for groove bottom grinding processing and dressing processing can be obtained due to the cylindrical shape, Moreover, even if the abrasive grains on the tip surface of the cylindrical grinding portion are consumed or fallen off, the abrasive grains on the lower side can appear on the tip surface and contribute to the grinding action, resulting in a longer tool life than in the past. To be

[0009]

Another aspect of the present invention is preferably such that the cylindrical grinding portion has superabrasive grains such as diamond grains or CBN grains on the outer peripheral surface of one end of the cylindrical base metal. In the state where the superabrasive grains are located on the upper surface, a metal binder that is softer than the material to be cut, such as steel, such as nickel (Ni), is bonded to the outer peripheral surface by electroplating. , One end portion of the cylindrical base metal located on the inner peripheral side of the cylindrical grinding portion is removed by machining to have a thickness structure in which the superabrasive grains are arranged in one or two layers. is there. By doing so, the cylindrical grinding portion has a relatively thin-walled cylindrical shape having a thickness structure in which superabrasive grains are arranged in one layer or two layers, so that suitable groove bottom grinding processing and long tool life can be achieved. There is an advantage that can be obtained.

[0010]

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

FIG. 1 is a perspective view showing a cup-type grinding tool 10 according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the cup-type grinding tool 10. This cup-type grinding tool 10 can also be called a cup-type superabrasive grain electrodeposition grindstone, and is, for example, a cylindrical base metal 12 made of tool steel and fixed to one end of the cylindrical base metal 12. And a cup-shaped or cylindrical grinding portion 14 having one end opened, and grinding is performed using the tip surface 16 of the cylindrical grinding portion 14.

FIG. 3 shows a side plate 22 of a scroll compressor provided with a spiral fine groove 20 which is grooved by the cup-type grinding tool 10 and is horizontal on a work table (not shown) during grinding. It is designed to be fixed in various postures. The cup type grinding tool 10
In the process of moving the base metal 12 along the alternate long and short dash line in a state where the base metal 12 is detachably fixed concentrically to a chuck provided around a vertical axis of a rotary main shaft of a grinder (not shown), The groove bottom processing is performed.
For example, the cup-type grinding tool 10 is lowered to a processing position where the tip surface 16 thereof is ground, and then the fine groove 2
Grinding is performed while being moved along 0.

In the cylindrical grinding portion 14, a grindstone structure in which superabrasive grains 26 such as diamond grains and CBN grains are bonded by a metal binder 28 is backed by a thin metal layer for backing, that is, a backing layer 40. By doing, 0.3
It has a thickness of about mm. That is, the cylindrical grinding portion 14 has the superabrasive grains 2 on the outer peripheral surface of the tip of the cylindrical base metal 12.
6 is joined by the electrodeposition method, and the tip end of the cylindrical base metal 26 located on the inner peripheral side of the cylindrical grinding portion 14 is removed by machining, whereby the superabrasive grains 26 are formed.
It has a thickness structure that is lined up in one layer.

The cylindrical grinding portion 14 is constructed, for example, according to the steps shown in FIG. That is, in the base metal preparing step 32, the base metal 12 formed into a cylindrical shape from a metal material such as tool steel is prepared. The base metal 12 at this time has a large-diameter tip portion of, for example, about 8 mmφ having a size substantially corresponding to the inner peripheral side space of the cylindrical grinding portion 14 in the cup-type grinding tool 10 shown in FIGS. 1 and 2. The large-diameter tip portion is formed integrally with a small-diameter base end portion having a size smaller than that of the large-diameter tip portion, for example, about 6 mmφ.

In the electrodeposition step 34, the end surface of the large-diameter tip portion and the small-diameter base end portion are masked in advance to prevent electrodeposition, and a nickel plating layer is preliminarily applied to the surface not covered by the mask. The base metal 12 is, for example, # 8
Superabrasive grains 26 such as 0 CBN abrasive grains are immersed in an electrodeposition tank containing a nickel plating solution in which a direct current is applied between the base metal 12 and other electrodes. As a result, nickel is deposited on the outer peripheral surface of the large-diameter tip portion of the base metal 12 while avoiding the superabrasive grains 26 that are insulators, and the gaps between the superabrasive grains 26 are filled and deposited. The superabrasive grains 26 on the outer peripheral surface of the large-diameter tip portion are fixed by the metal binder 28 made of nickel to form the cylindrical grinding portion 14.

Next, in the cleaning step 36, the large-diameter tip portion of the base metal 12 is cleaned to remove the superabrasive grains 26 other than one layer of the superabrasive grains 26 fixed on the outer peripheral surface thereof.
6 is easily removed. Then, the base metal tip removing step 3
8, the cylindrical grinding portion 1 of the large-diameter tip portion of the base metal 12
The cup-shaped grinding tool 10 shown in FIGS. 1 and 2 is obtained by removing a region substantially corresponding to the inner peripheral side space of 4 by cutting, for example. Since the cylindrical grinding portion 14 in the present embodiment is configured in a state where the superabrasive grains 26 are arranged in a single layer and the thickness thereof is, for example, about 0.2 mm,
It is reinforced by a backing layer 40 of about 0.1 mm for ensuring rigidity. The backing layer 40 is provided by leaving the outermost peripheral layer of the large-diameter tip portion of the base metal 12 during the cutting in the base metal tip portion removing step 38, and the rigidity of the cylindrical grinding portion 14 is provided. Is sufficiently obtained, and the thickness is set so as not to hinder the grinding of the bottom surface of the narrow groove 20.

In the cup type grinding tool 10 of the present embodiment constructed as described above, the cylindrical grinding portion 14 has a metal backing layer having a thin grindstone structure in which superabrasive grains 26 are bonded by a metal binder 28. Since it is lined with 40 to have a small thickness, it is sharp, and its cylindrical shape provides a relatively sufficient rigidity necessary for groove bottom grinding processing and dressing processing. Even if the superabrasive grains 26 on the tip surface 16 of the above are worn or dropped, the superabrasive grains 26 on the lower side thereof appear on the tip face 16 and can contribute to the grinding action, so that the tool life is longer than that of the conventional one. To be

Further, according to the present embodiment, the cylindrical grinding portion 1
No. 4 is nickel (Ni) or the like in a state where the superabrasive grains 26 such as diamond grains or CBN grains are located on the outer peripheral surface of the tip of the cylindrical base metal 12 and the superabrasive grains 26 are located on the outer peripheral surface. Softer than the side plate (material to be cut) 22
8 are joined by an electrodeposition method in which they are fixed to the outer peripheral surface by electroplating, and the tip of the cylindrical base metal 12 located on the inner peripheral side of the cylindrical grinding portion 14 is removed by machining. As a result, the superabrasive grains 26 have a thickness structure in which they are arranged in a single layer. For this reason, the cylindrical grinding portion 14 has a relatively thin-walled cylindrical shape having a thickness structure in which the superabrasive grains 26 are arranged in a single layer, and thus there is an advantage that a suitable groove bottom grinding process and a long tool life can be obtained. .

[0019]

[0020]

[0021]

Although one embodiment of the present invention has been described with reference to the drawings, the present invention can be applied to other modes.

For example, the cup-type grinding tool 10 described above,
Although 46 has been described as performing fine grinding of fine grooves, it may be possible to perform surface grinding on a relatively small plane or dressing such as sharpening or truing a grindstone.

Further, in the above-mentioned embodiment, nickel was used as the metal binder 28 for bonding the superabrasive grains 26 to the base metal 12, but copper Cu, cobalt Co, iron Fe.
Other metals, such as, may be used.

Further, the cup type grinding tools 10 and 46 described above are used.
, The radial thickness of the cylindrical grinding portion 14 is 0.
Although the thickness is about 3 to 0.4 mm, if the thickness is about 1.5 to 2.0 mm, for example, a sharp grinding process can be performed on the bottom surface of the narrow groove 20.

Further, the base metal 12 of the above-mentioned embodiment is S45.
Other steel materials known as C and SK materials may be used.

The above description is merely an embodiment of the present invention, and the present invention can be modified in various ways without departing from the spirit of the invention.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a configuration of a cup-type grinding tool according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view illustrating the configuration of the cup-type grinding tool of FIG.

FIG. 3 is a perspective view illustrating groove processing using the cup-type grinding tool of FIG.

4A to 4C are process diagrams illustrating a manufacturing process of the cup-type grinding tool of FIG.

FIG. 5 is a perspective view illustrating a configuration of a conventional cup-type grinding tool.

6 is a vertical cross-sectional view illustrating the configuration of the cup-type grinding tool of FIG.

[Explanation of symbols]

10, 46: Cup-type grinding tool 12: Base metal 14: Cylindrical grinding part 16: Tip surface 26: Super abrasive grain (abrasive grain) 28: Metal binder

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kinya Yokoi Kinya Yokono, 210, Takeno, Osamu-machi, Ukiha-gun, Fukuoka Noritake Diamond Co., Ltd. (56) Reference JP-A-51-114307 (JP, A) JP-A-5- 237769 (JP, A) JP 11-10537 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B24D 7/00 B24D 3/00 310 B24D 3/00 320 B24D 3 / 06

Claims (2)

(57) [Claims] 1. A cup-type grinding tool, comprising a cylindrical grinding part at one end of a cylindrical base metal, and grinding using a tip end surface of the cylindrical grinding part, wherein the cylindrical grinding part is a super- grinding tool. The grindstone structure in which grains are bonded by a metal binder is thinner than the grindstone structure and has the above-mentioned cylindrical shape.
A cup-type grinding tool, characterized in that it is made of metal backed with a base metal. 2. The cylindrical grinding part is one in which superabrasive grains are bonded to the outer peripheral surface of one end of the cylindrical base metal by an electrodeposition method, and is located on the inner peripheral side of the cylindrical grinding part. The cup-type grinding tool according to claim 1, wherein one end portion of the cylindrical base metal is removed by machining to have a thickness structure in which the superabrasive grains are arranged in one or two layers.