JPH04289077A - Grinding wheel - Google Patents

Abstract

PURPOSE:To improve grinding performance by forming hard layers with high abrasive grain density and high hardness on a grinding wheel to be arranged radically in a peripheral direction, and soft layers with low abrasive grain density and elasticity between both the adjacent hard layers respectively to ensure the following performance of the grinding wheel. CONSTITUTION:A grinding wheel W is formed by jointing, axially and concentrically with the position of the adjacent had layers 6 matched, plural disc-shaped wheel pieces 11 where multiple hard layers 6 elongating radically and multiple soft layers 10 formed respectively between both the adjacent hard layers 6 are arranged alternatively in a peripheral direction. In the grinding wheel W, the hard layers 6 with high abrasive grain and the soft layers 10 with low abrasive grain density and elasticity are formed alternatively to make the grinding wheel own excellent grinding performance by the respective hard layers 6, excellent following performance and elastic performance by the respective soft layers 10.

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 grinding metal materials and the like.

0002

BACKGROUND OF THE INVENTION Conventionally, a non-woven abrasive wheel in which abrasive grains are fixed to constituent fibers of a non-woven fabric has been used as a grinding wheel for grinding metal materials.

0003

[Problem to be Solved by the Invention] In a non-woven polishing wheel, if the bulk specific gravity (weight per unit volume) is reduced by reducing the amount of abrasive grains, the flexibility of the wheel will be improved and it will be easier to handle the material to be ground. Although the follow-up performance during grinding improves, the grinding performance decreases. Furthermore, if the bulk specific gravity is increased by increasing the amount of abrasive grains, the grinding performance will improve in proportion to the bulk specific gravity, but the upper limit of the bulk specific gravity is limited by the structure and rigidity of the grinding machine. It cannot be made larger than the limit. Furthermore, when the bulk specific gravity is increased, there are problems in that the follow-up performance is reduced and that a so-called knocking phenomenon occurs on the surface to be ground when the limit pressure is exceeded during grinding. An object of the present invention is to solve the above-mentioned problems and improve the grinding performance by ensuring the follow-up performance of the grinding wheel.

0004

[Means for Solving the Problems] The grinding wheel of the present invention is formed by intertwining and bonding fiber groups to be elastically compressible and deformable, and has a synthetic resin as a main component in a part of the base material to which abrasive grains are fixed. A large number of hard layers are hardened by fixing a mixture of the main material and abrasive grains and extend radially from the center toward the periphery, and a large number of soft layers are formed between the two adjacent hard layers. It has a structure in which a plurality of disc-shaped wheel pieces in which layers are arranged alternately in the circumferential direction are joined concentrically in the axial direction with the positions of the adjacent hard layers aligned.

[0005]

[Operation] A hard layer with high abrasive grain density is formed on the grinding wheel and arranged radially in the circumferential direction, and a soft layer with low abrasive grain density and elasticity is formed between the two adjacent hard layers. The hard layers improve cutting performance, and the soft layers ensure tracking performance and elastic performance, thereby suppressing an increase in bulk specific gravity.

[0006]

[Effects of the Invention] Since the present invention is constructed as described above, hard layers with high abrasive grain density and elastic soft parts with low abrasive grain density are alternately formed on the grinding wheel. The grinding wheel W can have both excellent grinding performance due to the layers and excellent tracking performance and elastic performance due to each soft layer. In addition, each hard layer has a structure similar to that of a grinding wheel, and the grinding load is handled by a large number of abrasive grains, so the grinding surface of the material to be ground is uniform and the finished state is more precise. Since the abrasive grains act effectively, it is possible to increase the amount of grinding and the grinding ratio, and it is also possible to suppress welding of cutting powder to the material to be ground due to frictional heat. Furthermore, each soft layer interposed between the hard layers can exert a spring effect and improve the tracking performance and elastic performance of the grinding wheel, increasing both the critical pressure and circumferential speed of the grinding wheel during grinding. At the same time, it is possible to reduce the knocking phenomenon as the critical pressure and circumferential speed increase. In particular, since the bulk specific gravity of the soft layer of the grinding wheel can be reduced, it is possible to effectively improve grinding performance by ensuring follow-up performance and elastic performance without increasing the bulk specific gravity of the entire grinding wheel. .

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. The primary base material 8 for manufacturing the grinding wheel W is formed of a nonwoven fabric in which a large number of fibers 1 are intertwined and the intersections of the fibers 1 are bonded with a binder 2 so that it can be elastically compressed and deformed.
A large number of abrasive grains 3 are fixed to the surface of the fiber 1.

[0008] The primary base material 8 is pretreated as necessary in order to improve the adhesion between the fibers 1 and the abrasive grains 3, and to adjust the elasticity and flexibility of the primary base material 8. . In this pretreatment, a synthetic resin selected from among thermosetting resins such as phenol resin, epoxy resin, and urethane resin, or thermoplastic resins such as acrylic resin and polyester resin, depending on the purpose of the grinding wheel W, is applied to the nonwoven fabric. Alternatively, the synthetic resin coating 4 is formed on the surface of the fiber 1 by impregnating it and then heat-treating it.

[0009] When fixing the abrasive grains 3 to the constituent fibers 1 of the primary base material 8, the above-mentioned thermosetting resin or thermoplastic resin 5 is applied or impregnated on the front and back surfaces of the nonwoven fabric.
After the abrasive grains 3 are attached, heat treatment is performed to fix the abrasive grains 3 to the fibers 1.

[0010] For the secondary base material 9, a slurry in which the above-mentioned main material mainly composed of thermosetting resin or thermoplastic resin and abrasive grains is mixed is applied to the primary base material 8 from the vicinity of the center to the peripheral part. A large number of hard layers 6 are formed, each of which is applied in a band shape extending toward the outside and then hardened by heat treatment, and arranged radially around the center of the first base material 8. Each hard layer 6 is formed so as to penetrate from the surface layer to the back layer of the primary base material 8.

The wheel piece 11 has a center hole 7 punched in the center of the secondary base material 9, and the secondary base material 9 is formed by punching a center hole 7 in the center of each hard layer 6.
The abrasive grains are punched out into a disc shape concentric with the center hole 7 so that they are arranged rotationally symmetrically, and the abrasive grains in the wheel piece 11 have a high density of abrasive grains extending radially from the vicinity of the center toward the periphery. A large number of hard layers 6 and soft layers 10 each formed between adjacent hard layers 6 and having a low abrasive grain density are arranged alternately. The longitudinal cross-sectional shape of each hard layer 6 of the wheel piece 11 is set to be a substantially circular arc shape convexly curved toward the rotational direction a with respect to a radial straight line connecting the center and the outer peripheral edge of the wheel piece 11.

The grinding wheel W has a plurality of wheel pieces 10 arranged in a straight line with the outer edges 6a of the hard layers 6 arranged in a horizontal line with the positions of the adjacent hard layers 6 aligned. , are formed by being joined concentrically in the axial direction. The grinding wheel W includes a large number of hard layers in which the hard layers 6 of each wheel piece 11 are connected in a horizontal row, and each wheel piece 1.
One soft layer 10 is alternately formed with a large number of soft layers connected in a horizontal line, and the outer edge 14 of each hard layer is a straight line parallel to the axis of the grinding wheel W (see FIG. 1), or This is a straight line that obliquely intersects the axis (see Fig. 7).

Next, the operation and effects of the embodiment having the above-described configuration will be explained. In this example, a main material mainly composed of synthetic resin and abrasive grains are formed on a part of the primary base material 8 in which a group of fibers are intertwined and joined to be elastically compressible and to which abrasive grains 3 are fixed. a large number of hard layers 6 which are hardened by fixing a mixture of the above and extend radially from the vicinity of the center toward the periphery;
A plurality of disc-shaped wheel pieces 11 in which a large number of soft layers 10 formed between adjacent hard layers 6 are arranged alternately in the circumferential direction are aligned with the positions of the adjacent hard layers 6. The grinding wheel W is connected concentrically in the axial direction in the state
has been formed.

For this reason, the grinding wheel W has a hard layer 6 with a high abrasive grain density and a soft layer 1 with a low abrasive grain density and elasticity.
0 are alternately formed, and the grinding wheel W can have both the excellent grinding performance of each hard layer 6 and the excellent tracking performance and elastic performance of each soft layer 10.

Furthermore, since each hard layer 6 has a structure similar to that of a grindstone and the grinding load is borne by a large number of abrasive grains, the material to be ground 15
The ground surface becomes uniform and the finished state (surface roughness) becomes more precise, and since a large number of abrasive grains act effectively on each hard layer 6, the amount of grinding and the grinding ratio can be increased, and Welding of cutting powder to the material to be ground 15 due to frictional heat can be suppressed.

Furthermore, each soft layer 1 interposed between the hard layers 6
0 exerts a spring effect and can improve the following performance and elastic performance of the grinding wheel W, so it is possible to increase both the critical pressure and circumferential speed of the grinding wheel W during grinding, and the critical pressure Also, the knocking phenomenon can be reduced as the circumferential speed increases.

In particular, since the bulk specific gravity of the soft layer 10 of the grinding wheel W can be reduced, the tracking performance and elastic performance can be ensured without increasing the bulk specific gravity of the grinding wheel W as a whole, and the grinding performance can be effectively improved. can be improved.

Table 2 shows the results of a performance comparison test between the grinding wheel W of the present invention described above and a conventional nonwoven fabric grinding wheel. Table 1 shows the usage details of the grinding wheel of the present invention and the conventional nonwoven fabric grinding wheel used in the test.

[0019]

[Table 1] Furthermore, the grinding conditions are as follows. Material to be ground: SUS-304, width 40mm Wheel circumferential speed (m/min): 1100, 1300 Feeding speed of material to be ground (m/min): 10 Load (HP/25mm)
:2.8 Grinding method: Down cut Grinding oil: Water-soluble grinding fluid, 50 times diluted

[0020]

[Table 2] As a result of the above-mentioned performance comparison test, the grinding wheel W of the present invention was superior to the conventional nonwoven fabric grinder in terms of grinding performance such as grinding amount, stock removal, wheel loss, grinding ratio, presence of welding, and knocking phenomenon. Significantly superior to wheels,
It was also demonstrated that the grinding wheel W of the present invention is excellent in terms of the finished state of the material to be ground.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of a grinding wheel.

FIG. 2 is a partially enlarged view of a nonwoven fabric.

FIG. 3 is a partially enlarged sectional view of the primary base material.

FIG. 4 is a perspective view of a secondary base material.

FIG. 5 is a perspective view of the wheel piece.

FIG. 6 is a side view showing the grinding wheel in use.

FIG. 7 is a perspective view showing another example of a grinding wheel. 1 Fiber 3 Abrasive grains 6 Hard layer 8 Primary base material 10 Soft layer 11 Wheel piece W Grinding wheel

Claims (1)

[Claims] Claim 1: A mixture of a main material mainly composed of synthetic resin and abrasive grains is applied to a part of a base material in which fiber groups are intertwined and joined to be elastically compressible and to which abrasive grains are fixed. A large number of hard layers that are fixed and hardened and extend radially from the vicinity of the center toward the periphery, and a large number of soft layers formed between the two adjacent hard layers are arranged alternately in the circumferential direction. A grinding wheel characterized in that it is formed by concentrically joining a plurality of disc-shaped wheel pieces in the axial direction with the positions of the adjacent hard layers aligned.