JP4084952B2 - Cylindrical grinding wheel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a cylindrical grinding wheel used for industrial grinding.
[0002]
[Prior art]
An annular grindstone part involved in grinding processing, and a disk-shaped core part fixed on the inner peripheral side of the grindstone part, and the core part is a grinding machine via a pair of flange members The grinding surface of the work material is ground by the abrasive layer provided on the grindstone portion by being held in contact with the work material while being gripped and fixed to the rotation main shaft and rotated about its axis. Cylindrical grinding wheels are known. Such a double-structure cylindrical grinding wheel has less material such as abrasive grains than a cylindrical grinding wheel in which a portion corresponding to the core portion is integrally formed with the same grinding wheel structure as the grinding wheel portion. In addition to the above, by selecting the material used for the core part, the cylindrical grinding wheel that has become unsuitable for use due to the decrease in outer diameter due to grinding for a long time is recovered. The separated core portion can be reused as a material for a new cylindrical grinding wheel.
[0003]
As a method for such reuse, for example, there is a method for regenerating a grinding wheel described in the specification of Japanese Patent Application No. 2000-327685. This is an invention previously made by the present inventor. In such an invention, various metal materials such as an aluminum alloy, steel, or cast iron have been proposed as the material of the core portion. Among these, aluminum alloys have the advantage of being lighter than materials such as steel or cast iron. Cylindrical grinding wheels that use such aluminum alloys as the core material have a relatively high rotational peripheral speed. It is also suitably used for grinding. However, aluminum alloys have such advantages, but in addition to being relatively expensive, the thermal expansion coefficient is as large as about 2.4 × 10 ⁻⁵ . For example, the abrasive grains are mutually separated by vitreous binder. In a cylindrical grinding wheel equipped with a grindstone with a vitrified grindstone structure formed by bonding, the bonding force between the grindstone and the core may be weakened due to expansion / contraction due to temperature change. And is used only for a cylindrical grinding wheel with a special aspect.
[0004]
[Problems to be solved by the invention]
On the other hand, materials such as steel and cast iron are relatively inexpensive and have a thermal expansion coefficient similar to that of the vitrified grindstone structure described above. However, it is preferably used as a material for a core portion in a general cylindrical grinding wheel. However, steel or cast iron has the disadvantage that it is relatively heavy. Cylindrical grinding wheels that use steel or cast iron as the core material are used for grinding operations with a relatively high rotational peripheral speed. There was a problem that it was difficult to be done.
[0005]
As a simple means for reducing the weight of the core, it is conceivable to provide a plurality of holes in the core. However, when a cylindrical grinding wheel equipped with such a core is rotated around its axis during grinding, the plurality of holes are provided, which generates noise due to wind noise. In addition to this, a new problem occurs in that the grinding fluid is impeded by the air flow. Further, as another means, it is conceivable to reduce the thickness dimension of the core part, but when trying to make the core part thinner than a predetermined thickness, the dimensional accuracy is reduced due to distortion in the production stage of the core part, Abnormal vibration may occur during grinding. That is, at present, no suitable means for reducing the weight of the core has been provided.
[0006]
The present invention has been made against the background of the above circumstances, and an object of the present invention is to provide a cylindrical grinding wheel that has a relatively lightweight core portion and that does not cause problems during grinding. There is.
[0007]
[Means for Solving the Problems]
In order to achieve such an object, the gist of the present invention includes an annular grindstone part involved in grinding, and a disk-shaped core part fixed on the inner peripheral side of the grindstone part, A cylindrical grinding wheel that has a core portion that is gripped and fixed to a rotary main shaft through a pair of flange members, and that is rotated around the axis and is ground by the grindstone portion. A plurality of partial annular holes centered on the shaft center are provided in a portion related to gripping and fixing by a pair of flange members so that the opening is closed by the flange member. To do.
[0008]
【The invention's effect】
According to this configuration , a plurality of partial annular holes centering on the shaft center are provided in a portion related to gripping and fixing by the pair of flange members in the core portion. Since the plurality of holes are covered with the pair of flange members and the openings thereof are closed, there is no problem that noise due to wind noise is generated or the application of the grinding fluid is hindered by the air flow. That is, it is possible to provide a cylindrical grinding wheel that has a relatively lightweight core portion and that does not cause a problem during grinding.
[0009]
Other aspects of the invention
Here, preferably, the hole is a through-hole provided through the core in the thickness direction. According to this configuration, a plurality of through holes are provided in a portion of the core portion that is involved in gripping and fixing by the pair of flange members, and the plurality of through holes are covered with the pair of flange members during grinding. Since the opening on both sides is closed, the core portion can be reduced in weight in a suitable manner.
[0010]
Preferably, a thickness of a portion of the core portion that is not involved in holding and fixing by the pair of flange members is made thinner than a portion that is involved in holding and fixing by the pair of flange members. If it does in this way, the part which does not participate in the holding | grip fixation by the said one pair of flange member in the said core part can be made as thin as possible with required and sufficient thickness dimension, and the said core part in a suitable aspect Can be further reduced in weight.
[0011]
【Example】
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
[0012]
1A and 1B are views for explaining a cylindrical grinding wheel 10 according to an embodiment of the present invention. FIG. 1A is a plan view seen from the direction of the axis S, and FIG. It is sectional drawing. As shown in this figure, this cylindrical grinding wheel 10 is a circle composed of a grindstone structure in which abrasive grains are bonded to each other by a binder such as a vitreous binder in order to participate exclusively in the grinding of a work material. An annular grindstone portion 12 and a perforated disc (disk) -shaped grindstone support portion, that is, a core portion 14 made of, for example, a metal material fixed on the inner peripheral side of the grindstone portion 12 are provided. × Outer diameter 1065 mmφ × Thickness t22 mm
[0013]
The grindstone structure of the grindstone 12 is a well-known vitrified grindstone structure, and abrasive grains or abrasives such as silicon carbide (SiC) or molten alumina (Al ₂ O ₃ ) are used as silicon oxide (SiO ₂ ). It is a porous grindstone structure in which a large number of continuous or discontinuous pores are formed while being bonded by a vitreous inorganic binder (vitrified bond) containing as a main component.
[0014]
The core portion 14 is made of a metal material such as steel having an outer diameter of about 700 mmφ or cast iron. That is, in the cylindrical grinding wheel 10 of the present embodiment, the grinding wheel portion 12 is provided in a portion from the outer circumferential surface to a diameter of about 700 mmφ, and the inner circumferential surface of the grinding wheel portion 12 and the core portion 14. Are fixed to each other by, for example, a two-component synthetic resin binder, and the core portion 14 is provided in a portion from a diameter of about 700 mmφ to the inner peripheral surface.
[0015]
FIG. 2 shows a state in which the cylindrical grinding wheel 10 of this embodiment is gripped and fixed to the rotary spindle 16 of the grinding machine by cutting it with an axis S common to the cylindrical grinding wheel 10 and the rotary spindle 16. It is sectional drawing shown. As shown in FIG. 2, the cylindrical grinding wheel 10 of the present embodiment has a pair of flange members whose core portions 14 each have a perforated disk shape, that is, a first flange member fixed to the rotary main shaft 16. 18 and a second flange member 20 fixed to the first flange member 18, and is gripped and fixed to the rotary main shaft 16 of the grinding machine and slid onto a work material (not shown) while being rotated about the axis S. By being in contact with each other, the work surface of the work material is ground by the abrasive layer provided on the grindstone 12.
[0016]
As shown in FIG. 2, the end 22 of the rotating main shaft 16 is formed in a tapered shape, and a male screw 26 is formed on the axis S thereof. A hole 24 corresponding to the end 22 is formed in the center of the first flange member 18, and the hole 24 penetrates the flange member 18 in the thickness direction. Further, the first flange member 18 and the second flange member 20 have a dug lower portion 30 which is dug down in an annular shape from the outer peripheral surface to a predetermined diameter in order to abut and hold and fix the core portion 14. 32 are formed. The first flange member 18 is formed with a plurality of female screws 34 on the concentric circle centered on the axis S, for example, at substantially equal intervals, and the plurality of female screws 34 in the second flange member 20 are formed. A plurality of through holes 36 are respectively formed in portions corresponding to the female screws 34.
[0017]
The rotary main shaft 16 and the first flange member 18 are fixed to each other by a nut 28 being screwed onto the male screw 26 in a state where the end 22 and the hole 24 are fitted together. The first flange member 18 and the second flange member 20 fixed to the rotary spindle 16 are the second flange member 20 in a state where the core portion 14 is in contact with the digging portions 30 and 32. The plurality of bolts 38 inserted into the plurality of through holes 36 in the member 20 are fixed to each other by being screwed into the plurality of female screws 34 in the first flange member 18. Thus, the first flange member 18 and the second flange member 20 are fixed to each other in a state where the core portion 14 of the cylindrical grinding wheel 10 is held and fixed with sufficient strength.
[0018]
Here, as shown in FIG. 1, a plurality of holes are formed in the core portion 14 of the cylindrical grinding wheel 10 of the present embodiment. The plurality of hole portions are preferably a plurality (eight in this embodiment) of partial annular through-holes centering on the axis S provided through the core portion 14 in the thickness direction. 2, as shown in FIG. 2, for example, a part from the inner peripheral surface of the core portion 14 to a diameter of about 430 mmφ involved in gripping and fixing by the first flange member 18 and the second flange member 20, that is, When attached to the first flange member 18 and the second flange member 20, the digging portions 30 and 32 are brought into close contact with the core portion 14 so that the opening 44 of the through hole 42 is blocked. Is provided. Further, the portion of the core portion 14 that is not involved in the holding and fixing by the first flange member 18 and the second flange member 20 is a portion whose thickness is related to the holding and fixing by the first flange member 18 and the second flange member 20. It is thinner than. That is, the diameter of the core portion 14 from about 430 mmφ to a predetermined diameter R _1, for example, about 550 mmφ becomes thinner as it goes to the outer periphery, and the diameter R ₁ to a predetermined diameter R _2, for example, about 680 mmφ is constant. An annular groove 46 is formed from both flat surfaces so as to have a thickness dimension of, for example, about t6.0 mm. By configuring the core portion 14 as described above, the weight thereof is reduced by about 40% compared to the core portion in which the plurality of through holes 42 and the annular groove portion 46 are not provided.
[0019]
The present inventor manufactured a cylindrical grinding wheel 50 as shown in FIG. 3 as a comparative example in order to verify that the cylindrical grinding wheel 10 according to the present embodiment hardly generates noise. A comparative test was conducted. In the cylindrical grinding wheel 50, as shown in FIG. 3, a core portion 52 having the same inner diameter and outer diameter as the core portion 14 and made of the same material is fixed inside the grinding wheel portion 12. In the core portion 52, a plurality of through holes 54 are formed on a concentric circle centered on the axis S so as to be substantially equidistant. The through hole 54 has a diameter of about 145 mmφ, and the core 52 is gripped and fixed by the first flange member 18 and the second flange member 20 as shown by a chain line in FIG. It will communicate with the outside without being blocked.
[0020]
Using the cylindrical grinding wheel 50 of the comparative example configured as described above and the cylindrical grinding wheel 10 of the above-described embodiment, a grinding test was performed at a rotational peripheral speed of about 4800 m / min. The volume generated in the grinding process by the cylindrical grinding wheel 10 of the present embodiment was about 70 dB, whereas the volume generated in the grinding process by the cylindrical grinding wheel 50 of the comparative example. Was about 90 dB. As described above, the volume of the cylindrical grinding wheel 50 of the comparative example is increased because the through hole 54 formed in the core portion 52 communicates with the outside, so that noise due to wind noise is generated. This is considered to be the reason. In addition, in the grinding process by the cylindrical grinding wheel 10 of the present embodiment, no problem occurred in the application of the grinding fluid, whereas in the grinding process by the cylindrical grinding wheel 50 of the comparative example, the grinding fluid was used. The hindrance was inhibited. As described above, in the grinding process by the cylindrical grinding wheel 50 of the comparative example, the application of the grinding liquid is hindered because the through hole 54 formed in the core portion 52 communicates with the outside. This is thought to be due to the flow. From the above test results, the cylindrical grinding wheel 10 of the present embodiment has a cylindrical grinding wheel equipped with a through hole 54 in a portion not involved in gripping and fixing by the first flange member 18 and the second flange member 20. Compared to 50, it was confirmed that it is difficult to generate noise during grinding and does not cause problems such as impeding the application of grinding fluid.
[0021]
As described above, according to the present embodiment, a plurality of holes are provided in the portion of the core portion 14 that is involved in the gripping and fixing by the pair of flange members, that is, the first flange member 18 and the second flange member 20. In the grinding process, the plurality of holes are covered with the pair of flange members and the opening 44 is closed, so that noise due to wind noise is generated or the application of the grinding fluid is hindered by the air flow. Do not cause problems such as That is, it is possible to provide the cylindrical grinding wheel 10 that includes the relatively lightweight core portion 14 and that does not cause a problem during grinding.
[0022]
Preferably, the hole portion is a through hole 42 provided through the core portion 14 in the thickness direction, so that the portion of the core portion 14 involved in gripping and fixing by the pair of flange members. In the grinding process, the plurality of through holes 42 are covered with the pair of flange members and the openings 44 on both sides thereof are closed. 14 can be reduced in weight.
[0023]
Preferably, the thickness of the portion of the core portion 14 that is not involved in gripping and fixing by the pair of flange members is made thinner than the portion that is involved in gripping and fixing by the pair of flange members. The portion of the core portion 14 that is not involved in the holding and fixing by the pair of flange members can be made as thin as possible with a necessary and sufficient thickness dimension, and the core portion 14 can be further reduced in weight in a suitable manner. Can be
[0024]
As mentioned above, although the suitable Example of this invention was described in detail based on drawing, this invention is not limited to this, Furthermore, it implements in another aspect.
[0025]
For example, FIG. 4 is a diagram for explaining a cylindrical grinding wheel 60 according to another embodiment of the present invention, wherein (a) is a plan view seen from the direction of the axis S, and (b) is (a). FIG. 4 is a sectional view taken along line IV-IV. As shown in FIG. 4, the core portion 62 of the cylindrical grinding wheel 60 has a plurality of partial annular shapes (four in each case from the planes on both sides) centered on the axis S. The groove portions 64 are formed to be alternately provided with a predetermined depth dimension from the planes on both sides of the core portion 62. That is, in the present invention, the hole portion formed in the core portion does not necessarily have to be the through hole 42, and any form may be used as long as it is formed in a portion involved in gripping and fixing by the pair of flange members. .
[0026]
Further, in the above-described embodiment, the grindstone 12 has a vitrified grindstone structure in which abrasive grains are bonded to each other with a vitreous binder, but the present invention is not limited thereto. For example, it may be based on a resinoid grindstone structure in which abrasive grains are bonded to each other with a synthetic resin binder.
[0027]
Further, in the above-described embodiment, the grindstone 12 is an integral object having an annular shape as shown in FIG. 1, but is constituted by adhering a plurality of segment chips divided in the circumferential direction to the core. The present invention is also suitably used for segmented grinding wheels.
[0028]
In the above-described embodiment, the grindstone portion 12 is configured to include silicon carbide or fused alumina abrasive grains, that is, so-called general abrasive grains. For example, diamond abrasive grains or CBN abrasive grains are used. A so-called superabrasive grain may be provided.
[0029]
Further, in the above-described embodiment, the core portion 14 has the annular groove 46 formed from both planes thereof, so that the thickness of the portion of the core portion 14 that is not involved in the holding and fixing by the pair of flange members is Although it was made thinner than the part related to the holding and fixing by the pair of flange members, this is merely an example of a preferable aspect, and the core part is formed by forming the through hole 42. If the weight reduction of 14 is sufficiently achieved, it is not necessary to deliberately reduce the thickness of the portion not involved in the holding and fixing by the pair of flange members.
[0030]
Needless to say, the dimensions of the respective parts of the cylindrical grinding wheel 10 and the material of the core 14 are appropriately changed according to the application of the cylindrical grinding wheel 10.
[0031]
Although not exemplified one by one, the present invention is implemented with various modifications within the scope not departing from the gist thereof.
[Brief description of the drawings]
1A and 1B are views for explaining a cylindrical grinding wheel according to an embodiment of the present invention, in which FIG. 1A is a plan view seen from the axial direction, and FIG. 1B is a sectional view taken along line II in FIG. It is.
FIG. 2 is a cross-sectional view showing a state where the cylindrical grinding wheel of the present embodiment is gripped and fixed to a rotating spindle of a grinding machine, cut by a common axis to the cylindrical grinding wheel and the rotating spindle. .
3A and 3B are diagrams illustrating a cylindrical grinding wheel as a comparative example, where FIG. 3A is a plan view seen from the axial direction, and FIG. 3B is a sectional view taken along line III-III in FIG. .
4A and 4B are diagrams for explaining a cylindrical grinding wheel according to another embodiment of the present invention, in which FIG. 4A is a plan view seen from the axial direction thereof, and FIG. 4B is an IV-IV of FIG. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10, 60: Cylindrical grinding type grinding wheel 12: Grinding wheel part 14, 62: Core part 16: Rotation main shaft 18: 1st flange member 20: 2nd flange member 42: Through hole (hole part)
44: Opening 46: Annular groove 64: Hole

Claims (3)

An annular grindstone part involved in grinding processing and a disk-shaped core part fixed to the inner peripheral side of the grindstone part are provided, and the core part is held and fixed to the rotating spindle through a pair of flange members. Is a cylindrical grinding wheel that is rotated around its axis and is ground by the grinding wheel,
A plurality of partial annular holes centered on the shaft center are provided at portions of the core portion that are involved in gripping and fixing by the pair of flange members so that the openings are closed by the flange members. A cylindrical grinding wheel characterized by having   The cylindrical grinding wheel according to claim 1, wherein the hole portion is a through hole provided through the core portion in the thickness direction.   3. The cylindrical grinding according to claim 1, wherein a thickness of a portion of the core portion that is not involved in gripping and fixing by the pair of flange members is made thinner than a portion that is involved in gripping and fixing by the pair of flange members. Type grinding wheel.

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