JPH06335868A - Grinding wheel for working groove width - Google Patents

Abstract

PURPOSE:To provide a groove width working grinding wheel capable of making groove width work having high work efficiency, dimensional accuracy and surface roughness. CONSTITUTION:A groove width working grinding wheel 10 is composed of a plurality of grinding wheel members 16 stuck to the outer peripheral surface of a grinding wheel sticking member 14. A plurality of these grinding wheel members 16 have two kinds of grinding wheel members 16a, 16b differing in wearing amount are disposed altermately circumferentially of the grinding wheel sticking member 14 and stuck such that all outer surfaces 30 thereof are on the identical circumference and both sides are included in the identical plane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding wheel used for groove width processing.

[0002]

2. Description of the Related Art A thin disk-shaped grindstone fixing member used for machining groove widths of machine parts made of metal, ceramics or the like, and diamond, CBN or the like on the fixing surface of the outer peripheral surface of the grindstone fixing member. There is known a grinding wheel for groove width processing to which a grinding wheel member is fixed. At the time of this groove machining, the outer peripheral surface of the grindstone member that mainly processes the groove bottom and both side surfaces that mainly process the inner wall surface of the grindstone member are always in contact with the work material, increasing the grinding resistance and increasing the grinding fluid. Since it becomes difficult to supply the grinding wheel, a grinding wheel having a shape in which notches are formed at predetermined intervals in the circumferential direction is usually used. For example, it is a grinding wheel for groove width processing in which a plurality of grindstone members are fixed to the fixing surface of the grindstone fixing member at predetermined intervals in the circumferential direction.

[0003]

However, even with the above-described groove width processing grinding wheel, when the groove width to be processed is large, for example, the contact area increases and it becomes difficult to supply sufficient grinding fluid. Then, the surface damage of the work material such as so-called grinding burn easily occurs. In order to avoid this, a so-called softly acting grindstone with a large amount of wear may be used, but such a grindstone has a fast dimensional change due to wear of the grindstone in the groove width direction called so-called thin width, and the machining efficiency is high. In addition, there is a problem in that it cannot be used especially where high dimensional accuracy and surface roughness are required such as groove width machining of automobile parts and electric / electronic parts.

The present invention has been made based on the above circumstances, and its purpose is to achieve high processing efficiency, dimensional accuracy,
An object of the present invention is to provide a grinding wheel for groove width processing which has surface roughness and is capable of groove width processing.

[0005]

In order to achieve such an object, the gist of the present invention is that a thin disk-shaped grindstone fixing member and a predetermined fixing surface on the outer peripheral surface of the grindstone fixing member. A grindstone for groove width machining including a plurality of grindstone members fixed at intervals, wherein the plurality of grindstone members are at least two kinds of grindstone members having different wear amounts when used for grinding alone. The wheels are fixed in a predetermined order in the circumferential direction of the whetstone fixing member,
In addition, the outer peripheral surfaces of the plurality of grindstone members are included on one circumference, and both side surfaces are included in one plane.

[0006]

In this way, when a plurality of types of grindstone members having different amounts of wear are arranged in a predetermined order, for example, two types are alternate, three types (a, b, c) are alternated. Is fixed to the grindstone fixing member in the order of repeating abc and abc, and all the grindstones work on the entire machining surface of the groove to be ground. Therefore, a so-called hard-acting grindstone with a relatively small wear amount is used. The so-called softly-acting grindstone, which has a relatively large amount of wear, performs the finishing process by sharing the efficient grinding process. Therefore, while the grinding process is performed efficiently, the wear of the grindstone member, which originally has a large amount of wear, is mitigated, the dimension and shape accuracy of the grindstone for groove width machining are maintained, and a lot of highly accurate machining is possible. Also, while the dimension and shape accuracy are maintained and a good finished surface can be obtained,
The occurrence of grinding burn is suppressed by reducing the contact time of the grindstone member, which is naturally prone to grinding burn, with the work material. That is, it is difficult for grinding burn and width thinning to occur,
It is possible to efficiently perform groove width processing with high dimensional accuracy and surface roughness.

Preferably, the plurality of grindstone members are at least two kinds of grindstone members having different kinds of at least one of abrasive grains, particle size, bond degree, concentration degree, and binder type. In this way, since the wear amounts of the plurality of grindstone members can be varied depending on these factors, a groove width machining grinding whetstone to which at least two types of grindstone members having different wear amounts are fixed can be obtained.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings.

1 and 2 are a plan view and a partial cross-sectional view of a grinding wheel for groove width machining (hereinafter referred to as a grinding wheel) 10 which is an embodiment of the present invention. This grinding wheel 10
Mounting hole 12 in the center, for example made of aluminum alloy
A grindstone fixing member 14 having an outer diameter of 350 mm, for example,
The grindstone fixing member 14 is composed of a plurality of (20 in this embodiment) grindstone members 16 fixed to the outer peripheral surface of the grindstone fixing member 14, and the grindstone fixing member 14 has a relatively thick mounting portion 18 on the inner peripheral side. And a relatively thin (for example, 8 mm thick) grindstone fixing portion 20 on the outer peripheral side. Further, all of the plurality of grindstone members 16 have dimensions of, for example, a length in the circumferential direction of 52 mm, a width (length in the thickness direction of the grindstone fixing member 14) of 8 mm, and a thickness of 12 mm in the radial direction. For example, the outer peripheral surfaces 30 (grinding surfaces) of the plurality of grindstone members 16 are fixed on one surface at intervals of, for example, about 3 mm so that both side surfaces 26 (grinding surfaces) are included in one surface. There is.

In the present embodiment, for example, the plurality of grindstone members 16 include, for example, a grindstone member 16a (for example, CBN100N150V in the JIS standard display) having grain size # 100 bonded by vitrified bonds, and grain size # 8.
No. 0 CBN abrasive grain is bonded by vitrified bond to the grindstone member 16b (for example, CBN in the display according to JIS standard.
80N150V), and these whetstone members 16a and 16b are alternately arranged as they go in the circumferential direction of the whetstone fixing member 14, as shown in part in FIG. As described above, the grindstone member 16a and the grindstone member 16b have exactly the same shape and structure except that the grain size of the abrasive grains is different. In the present embodiment, the wear amount changes the grain size of the abrasive grains. It is supposed to be different.

The grinding wheel 10 constructed as described above is
A groove which is fixed to the rotary shaft of a grinder for grinding a groove (not shown) by the mounting hole 12 and is rotated in the circumferential direction to form a groove 24 in a work material (workpiece) 22 as shown in a partial cross section in FIG. Width processing was performed. It should be noted that the work material 22 is slightly narrower (for example, 7.4 mm) than a predetermined groove width (8 mm in this embodiment) in advance.
The lower groove 25 is formed, and therefore, the machining allowance by the grinding wheel 10 is 0.3 mm on one side. Also,
At the same time, for the purpose of comparison, groove width machining using a conventional grindstone, that is, a grindstone A having a structure similar to that of the grinding grindstone 10 and having grindstone members 16 a and a grindstone B having all grindstone members 16 b is performed for comparison. It was The grinding conditions are as shown in Table 1.

[0012]

[Table 1]

As a result, when the grinding wheel 10 is used, 2000 pieces of the work material 22 (groove 8000) are obtained with a predetermined accuracy.
It was possible to process (book). On the other hand, in the processing using the grindstone A, which was tested at the same time, the shape of the grindstone was deformed due to wear after 1300 pieces were machined, and machining became impossible, and in the processing using the grindstone B, grinding burn occurred. It could not be processed at all. That is, according to the grinding wheel 10, the wear of the wheel is small, and high-precision machining can be performed more in comparison with the conventional wheel.

In the grinding wheel 10 described above, the whetstone member 16a, which has a finer grain size and acts relatively softly, and the whetstone member 16b, which has a coarser grain size and acts relatively hard, are alternately arranged in the circumferential direction. In addition, since the grinding surfaces (outer peripheral surface / inner peripheral surface) of both the grindstone members 16a and 16b are in the same plane and both grindstone members contribute to the machining, the grindstone member 16a performs the efficient grinding process. , Grindstone member 1
6b shares the finishing process. Therefore, as shown in FIG. 3, even in the groove width machining in which the grindstone side surfaces 26, 26 are in constant contact with the groove side walls 28, 28, although the grinding is performed efficiently, the grindstone member 16a which originally has a large wear amount is The wear is alleviated and the dimensional and shape accuracy of the grinding wheel 10 is maintained, which enables many highly accurate processing. Further, while the dimensional and shape accuracy is maintained and a good finished surface is obtained, the contact time of the grindstone member 16b, which originally tends to cause grinding burn, to the work material 22 is reduced, so that the occurrence of grinding burn is suppressed. Of.

Next, another embodiment of the present invention will be described. Since the basic configuration of this embodiment is the same as that of the first embodiment, the description of common parts will be omitted with reference to FIGS.

For example, in the first embodiment, the grindstone fixing member 14 is made of SS steel and has an outer diameter of 300 mm, and the plural grindstone members 16 are 40 mm long, 5 mm wide and 10 mm thick.
The distance between the grindstone members 16 was 2 mm. Further, in this embodiment, for example, the CBN abrasive grains having a grain size of # 80 have a concentration degree of 18
0 (for example, CBN80M180V in the display method according to JIS standard) and the whetstone member 16d (for example, JI
In the display method according to the S standard, two kinds of grindstone members of CBN80M200V) are alternately arranged instead of the grindstone members 16a and 16b as in the first embodiment. In this embodiment, the amount of wear of the grindstone member 16 is made different by changing the degree of concentration of abrasive grains.

The grinding wheel 10 having the above construction was used for the same groove width processing as in the first embodiment. Table 2 for detailed processing conditions
As shown in FIG. 7, the grindstone member 16 is also used in this embodiment.
The grindstone C consisting only of c and the grindstone D consisting only of the grindstone member 16d were evaluated at the same time.

[0018]

[Table 2]

As a result, when the grinding wheel 10 of this embodiment was used, it was possible to machine 1200 pieces (7200 grooves) of the work material 22 with a predetermined accuracy. On the other hand, in the processing using the grindstone C, which was simultaneously tested, 600
After the individual processing, the shape of the grindstone was deformed due to wear and the processing became impossible. In the processing using the grindstone D, grinding was generated and the processing was impossible at all. That is, similarly to the first embodiment, the grinding stone 10 of this embodiment has a small abrasion of the grinding stone,
A lot of high precision machining was possible compared with the conventional grindstone.

In the grinding wheel 10 of the present embodiment, the grinding wheel member 16c having a relatively low concentration of abrasive grains and acting relatively softly.
And a grindstone member 1 having a relatively high concentration of abrasive grains and acting relatively hard
6d and 6d are arranged alternately in the circumferential direction, and both grindstone members contribute to the machining as in the first embodiment, so that the grindstone member 16c finishes efficient grinding. Share processing. Therefore, by the same operation as that of the first embodiment, the occurrence of grinding burn is suppressed, and a large number of highly accurate machining operations are possible.

Next, another embodiment of the present invention will be described. The basic configuration of this embodiment is similar to that of the first embodiment and will be described with reference to FIGS. 1 to 3.

For example, in the first embodiment, the grindstone fixing member 14 is made of FRP and has an outer diameter of 200 mm, the plurality of grindstone members 16 are 40 mm in length, 2 mm in width, 3 mm in thickness, and the interval between the grindstone members 16 is 2 mm. did. Further, in this embodiment, for example, a grindstone member 16e made of CBN abrasive grains (for example, CBN120N20 in the display method according to JIS standard).
0V) and a grindstone member 16f (for example, CBM120N200V in the display method according to JIS standard) composed of CBN (hereinafter, for convenience, referred to as CBM) abrasive grains having high toughness, instead of the grindstone members 16a and 16b. They are arranged alternately as in the embodiment. In this example,
The amount of wear of the grindstone member 16 is made different by changing the type of abrasive grains.

The grinding wheel 10 having the above structure was used for the same groove width processing as in the first embodiment. Table 3 for detailed processing conditions
As shown in FIG. 7, the grindstone member 16 is also used in this embodiment.
The grindstone E consisting only of e and the grindstone F consisting only of the grindstone member 16f were evaluated simultaneously.

[0024]

[Table 3]

As a result, in the case of using the grinding wheel 10 of this embodiment, it was possible to process 3000 pieces (24000 grooves) of the work material 22 with a predetermined accuracy. On the contrary,
In the processing using the grinding stone E, which was tested at the same time, 20
After the processing of 00 pieces, the shape of the grindstone was deformed due to wear and the processing became impossible, and in the processing using the grindstone F, grinding was generated and the processing was impossible at all. That is, similarly to the first embodiment, the grinding stone 10 of this embodiment has a small abrasion of the grinding stone, and can perform many highly accurate machining as compared with the conventional grinding stone.

In the grinding wheel 10 of the present embodiment, the CBN
A relatively soft-acting grindstone member 16e made of abrasive grains
And the relatively hard-acting grindstone members 16f made of CBM abrasive grains having a toughness higher than that of CBN are alternately arranged in the circumferential direction, and both grindstone members are processed in the same manner as in the first embodiment. In order to contribute, the grindstone member 16e takes part in efficient grinding and the grindstone member 16f takes part in finishing. Therefore, by the same operation as that of the first embodiment, the occurrence of grinding burn is suppressed, and a large number of highly accurate machining operations are possible.

Although the embodiments of the present invention have been described in detail above, the present invention can be carried out in still another mode.

Although CBN abrasive grains are used as the abrasive grains of the grindstone member 16 in the above-described embodiments, diamond abrasive grains similarly used for high precision machining may be used instead of the CBN abrasive grains.

Further, as the grindstone fixing member 14, other steel materials such as SS steel, aluminum alloy, FRP and the like shown in the embodiment, a grinding grindstone, or a combination thereof can be used.

The binder used to bond the abrasive grains is
Besides vitrified bond, metal bond, resin bond, electrodeposition, etc. may be used. However, the vitrified bond shown in the above-mentioned embodiment is most preferable because it can form a pore type grindstone from the viewpoint of machine truing and dressing easiness.

Further, the plurality of grindstone members may be composed of not only two kinds shown in the embodiment but also three kinds or more kinds. For example, in the above-mentioned first embodiment, if a part of the grindstone member a is replaced with a grindstone member having an intermediate wear amount between the two kinds of grindstone members, it becomes possible to further reduce the load of the softly acting grindstone member. A longer life can be obtained. Further, the arrangement of the grindstone members does not necessarily have to be alternately arranged as shown in the embodiment, and the shapes of the grindstone members do not all have to be the same. In the present invention, the grindstone member that acts relatively softly and the grindstone member that acts relatively hard may be arranged so as to contact the work material at predetermined time intervals. For example, instead of the order of ab and ab shown in the embodiment, they may be arranged as aab and aab.

Further, when the wear amounts of the plurality of grindstone members are greatly different, the wear deformation of the grindstone that acts softly becomes faster, so that the grain size and the degree of bonding for making the wear amounts different are
It is preferable that each is within two ranks in the JIS standard. For example, regarding the grain size of the abrasive grains, if one grindstone member is # 100, the other is preferably # 60 to # 140. Also, the type of abrasive grain, the degree of concentration,
It is preferable that the kind of the binder is also determined in accordance with it. That is, in the present invention, since the grindstone member that acts relatively soft and the grindstone member that acts relatively hard share the processing as described above, it is possible that all of the plurality of grindstone members are always involved in the grinding process. It is preferred for speed, accuracy and durability.

Further, the work material 22 is the SC shown in the embodiment.
Not only M steel, but also steel materials such as SS steel and SUS steel, ceramics and the like, which require high-precision groove width machining with a grindstone using CBN abrasive grains or diamond abrasive grains, can be used. Further, the shape of the work material 22 is not particularly limited as long as it is a shape such as a cylindrical shape, a plate shape, etc. in which the grinding wheel for groove width processing of the present invention can be used, and as shown in the examples. Not only the work material 22 but also a work material in which the lower groove 25 is not formed in advance can be processed. In such processing, in addition to the side surface 26 of the grinding wheel 10, the outer peripheral surface 30 is always in contact with the inner surface (bottom surface) of the groove, and when a conventional grinding wheel is used, grinding burn or abrasion deformation of the wheel is further reduced. Although it is likely to occur, the grinding wheel for groove width machining of the present invention can perform many highly accurate machining.

Although not illustrated one by one, the present invention can be variously modified without departing from the spirit thereof.

[Brief description of drawings]

FIG. 1 is a plan view showing a grinding wheel for groove width processing according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a partial cross-sectional view showing a processing example using the grinding wheel for groove width processing of FIG.

[Explanation of symbols]

 10: Grinding wheel for groove width processing 14: Grinding wheel fixing member 16a, 16b: Grinding wheel member 26: Side surface 30: Outer peripheral surface

Claims (2)

[Claims] 1. A grindstone for groove width machining, comprising: a thin-disk-shaped grindstone fixing member; and a plurality of grindstone members fixed to a fixing surface of an outer peripheral surface of the grindstone fixing member at a predetermined interval. The plurality of grindstone members, at least two kinds of grindstone members having different amounts of wear when used for grinding alone are fixed in a predetermined order along the circumferential direction of the grindstone fixing member, A grinding wheel for groove width processing, wherein the outer peripheral surfaces of the plurality of grindstone members are included in one circumference and both side surfaces are included in one plane. 2. The plurality of grindstone members are at least two kinds of grindstone members different in at least one of abrasive grain type, grain size, bond degree, concentration degree, and binder type. Grinding wheel for groove width machining of 1.