Manufacturing method of resin-impregnated superabrasive vitrified grinding wheel, and resin-impregnated superabrasive vitrified grinding wheel

Abstract

To provide a method for manufacturing a super abrasive vitrified grinding wheel in which the whole of a ground layer excluding a grindstone layer is correctly impregnated with a resin.SOLUTION: In the state that a pair of discoidal upper holding jigs 25 or lower holding jigs 24, which have a diameter same as a ground layer 14 or less, is in close contact with the ground layer 14, a fluid resin is impregnated toward a radial direction outer periphery from an inner peripheral surface 14a of the ground layer 14, resin impregnation is stopped when bleed out of a fluid two-component epoxy resin 34 occurs from outer peripheral ends of the pair of discoidal jigs, and the fluid two-component epoxy resin 34 (fluid resin) impregnated in the ground layer 14 is cured. By this, a vitrified grinding wheel 10, in which the whole of the ground layer 14 excluding a grindstone layer 16 is correctly impregnated with a resin, is manufactured.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a resin-impregnated superabrasive vitrified grinding wheel in which a vitrified grinding wheel portion, formed by bonding superabrasive grains using a vitrified bond, is provided on the outer periphery of a resin-impregnated vitrified core portion, and to a resin-impregnated superabrasive vitrified grinding wheel. [Background technology]

[0002] There are known superabrasive vitrified grinding wheels in which superabrasive vitrified grinding wheel pieces, made of superabrasive grains such as CBN or diamond bonded together with a vitrified bond, are attached to the outer circumferential surface of a base metal. For example, the vitrified superabrasive grinding wheel described in Patent Document 1 is one such example. Furthermore, instead of the base metal, a vitrified core is used in which aggregates such as abrasive grains and filler are bonded together with a vitrified bond, and vitrified grinding wheel pieces are attached to the outer circumferential surface of the core. Such vitrified grinding wheels are used, for example, for centerless grinding.

[0003] However, in grinding using a vitrified grinding wheel in which vitrified grinding wheel pieces are attached to the outer peripheral surface of the above-mentioned core, not only is it impossible to obtain sufficient quality of the machined surface of the workpiece due to the joints present at the boundaries of the vitrified grinding wheel pieces, but the increase in the number of parts and assembly labor also poses an obstacle to reducing manufacturing costs.

[0004] In contrast, instead of attaching vitrified grinding stone pieces to the outer peripheral surface of a vitrified core in which aggregates are bonded with a vitrified bond, it is conceivable that, for example, during the press molding stage, a circular compact preformed from the core material is placed in the center of a press mold, and the space between the outer peripheral surface of the compact and the outer peripheral wall of the press mold is filled with the superabrasive vitrified grinding stone material, and then press molding and sintering are performed to bond a grinding stone layer to the outer periphery of the base layer corresponding to the core with the molten vitrified bond. However, with such a superabrasive vitrified grinding stone in which the grinding stone layer is integrally formed on the outer peripheral surface of the base layer, there is a problem in that if grinding fluid penetrates into the base layer, the center of gravity becomes unevenly distributed, deteriorating the dynamic balance and affecting the quality of the machined surface.

[0005] To solve this problem, in a superabrasive vitrified grinding wheel in which a grinding wheel layer is integrally formed on the outer peripheral surface of a base layer, since the base layer and the grinding wheel layer are mutually vitrified grinding wheel structures, it is desirable to impregnate the entire base layer except for the grinding wheel layer with resin to perform a waterproofing treatment to prevent the infiltration of grinding fluid. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-146817 Summary of the Invention [Problem to be solved by the invention]

[0007] However, while it is conceivable to drip uncured liquid resin onto the surface of the base layer to impregnate the entire base layer except for the grinding stone layer, the larger the thickness of the superabrasive vitrified grinding stone, the more difficult it is to impregnate the entire base layer except for the grinding stone layer with resin.If the impregnated resin reaches the grinding stone layer, it can cause other problems, such as a loss of sharpness and reduced grinding performance.

[0008] The present invention has been made in light of the above circumstances, and its object is to provide a method for manufacturing a resin-impregnated, superabrasive, vitrified grinding wheel in which the entire base layer, except for the grinding wheel layer, is precisely impregnated with resin.

[0009] In light of the above circumstances, the inventors of the present invention have conducted extensive research into impregnating the base layer with resin from its exposed surface, and have discovered that the entire base layer, excluding the grinding stone layer, can be accurately impregnated with resin by placing a disc-shaped jig of the same diameter or smaller in close contact with the base layer, impregnating the base layer with fluid resin from its inner peripheral surface toward its outer periphery in the radial direction, and stopping the resin impregnation when fluid resin is visually observed seeping out from the outer peripheral edge of the disc-shaped jig. The present invention is based on this finding. [Means for solving the problem]

[0010] That is, the gist of the present invention is (a) Mounting holes are formed, A method for manufacturing a resin-impregnated super-abrasive vitrified grinding wheel, which has a circular base layer having a vitrified grinding wheel structure and a circular grinding wheel layer having the same thickness as the base layer and also having a vitrified grinding wheel structure, integrally formed with the base layer, the entire base layer being impregnated with resin, comprising: (b) a pair of disk-shaped jigs having a diameter equal to or smaller than that of the base layer; a lower holding jig and an upper holding jig having a central hole of 、 The base layer and the base layer is sandwiched between the base layer and the Closely attached to An airtight space is formed in the mounting hole and the central hole. (c) a jig attachment process for the resin in a fluid state Contained in the space, The underlayer The mounting holes The method includes (d) a resin impregnation step of impregnating the resin from the inner peripheral surface toward the outer periphery in the radial direction, (e) a resin impregnation stopping step of stopping the resin impregnation when the fluid resin begins to seep out from the outer peripheral ends of the pair of disk-shaped jigs, and (f) a resin hardening step of hardening the fluid resin impregnated into the base layer. [Effects of the Invention]

[0011] According to the resin-impregnated superabrasive vitrified grinding wheel of the present invention, Mounting holes are formed,In manufacturing a resin-impregnated superabrasive vitrified grinding wheel, the wheel integrally comprises a circular base layer having a vitrified grinding wheel structure and a circular grinding wheel layer having the same thickness as the base layer and also having a vitrified grinding wheel structure, the entire base layer being impregnated with resin, a pair of disk-shaped jigs having a diameter equal to or smaller than that of the base layer a lower holding jig and an upper holding jig having a central hole but 、 The underlying layer The base layer is sandwiched between the base layer and the base layer, and is concentric with the base layer. When the resin is in a fluid state, it Contained in a space, Undercoat layer Mounting hole The resin is impregnated from the inner peripheral surface toward the outer periphery in the radial direction, and when the fluid resin begins to seep out from the outer peripheral edges of the pair of disk-shaped jigs, the resin impregnation is stopped and the fluid resin impregnated in the base layer is allowed to harden. This produces a superabrasive vitrified grinding wheel in which the entire base layer, except for the grinding wheel layer, is precisely impregnated with resin.

[0012] Preferably, the jig mounting step includes: the lower holding jig and the upper holding jig Using the lower holding jig and the upper holding jig of Through sheet packing The base layer is sandwiched between the disc-shaped jig and the base layer, and the disc-shaped jig is brought into liquid-tight contact with the base layer. By stopping the resin impregnation when the fluid resin begins to seep out from the outer periphery of the disc-shaped jig, it can be determined that the fluid resin has been accurately impregnated into the entire base layer except for the grinding stone layer.

[0013] Preferably, the resin impregnation step is The mounting holes The fluid resin is uniformly pressurized over the entire inner circumferential surface, thereby impregnating the base layer with the fluid resin, so that the fluid resin uniformly impregnates the base layer radially outward.

[0014] Preferably, the resin impregnation step is The mounting holes The inner peripheral surface and the pair of disk-shaped jigs are surrounded by The aforementioned With the fluid resin confined in the airtight space, compressed air is supplied into the airtight space. Mounting hole The fluid resin is uniformly pressed onto the inner peripheral surface.

[0015] Preferably, the resin impregnation stopping step is performed by The mounting holesThe impregnation of the base layer with the fluid resin is stopped by stopping the uniform pressure of the fluid resin on the inner circumferential surface, thereby immediately stopping the impregnation of the base layer with the fluid resin.

[0016] Preferably, the resin is a two-component epoxy resin, the fluid resin is a fluid epoxy resin mixture obtained by mixing the two-component epoxy resin, and the resin curing step is a step of curing the fluid epoxy resin mixture by heating, thereby curing the fluid epoxy resin mixture impregnated in the base layer.

[0017] The gist of another invention is (a) Mounting holes are formed, A resin-impregnated superabrasive vitrified grinding wheel having a circular base layer with a vitrified grinding wheel structure and a circular grinding wheel layer with a vitrified grinding wheel structure that is provided on the outer periphery of the base layer with the same thickness as the base layer, the entire base layer being impregnated with resin, wherein: (b) the base layer and the grinding wheel layer are bonded together with a molten vitrified binder; and (c) the entire base layer, except for the grinding wheel layer, is impregnated with resin. With such a resin-impregnated superabrasive vitrified grinding wheel, there are no joints, compared to a vitrified grinding wheel in which vitrified grinding wheel pieces are attached to the outer peripheral surface of a core, so high quality of the machined surface can be obtained, and the number of parts and assembly steps can be reduced, thereby reducing manufacturing costs. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a front view illustrating a resin-impregnated superabrasive vitrified grinding wheel manufactured by the manufacturing method of this embodiment. [Figure 2] FIG. 2 is a process diagram illustrating an example of a manufacturing process for the resin-impregnated superabrasive vitrified grinding wheel of this embodiment. [Figure 3] FIG. 3 is a diagram illustrating the impregnation jig mounting step in FIG. 2. [Figure 4] FIG. 3 is a diagram illustrating the resin impregnation step in FIG. 2. [Figure 5]3 is a cross-sectional view illustrating an example of a resin-impregnated region in the underlayer obtained by the resin impregnation step of FIG. 2. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] An embodiment of the present invention will be described in detail below with reference to the drawings. Note that in the following embodiment, the drawings are appropriately simplified or modified, and the dimensional ratios and shapes of the various parts are not necessarily drawn accurately. [Example]

[0020] 1 is a front view of a resin-impregnated superabrasive vitrified grinding wheel (hereinafter referred to as a vitrified grinding wheel) 10 manufactured by a manufacturing method according to one embodiment of the present invention. The vitrified grinding wheel 10 integrally comprises a circular base layer 14 having a mounting hole 12 and a circular grinding wheel layer 16 provided on the outer periphery of the base layer 14 with the same thickness as the base layer 14.

[0021] The base layer 14 contains aggregates such as alumina, mullite, or silicon carbide, a vitrified binder, and interconnected pores. The aggregates are bonded together by the vitrified binder to form a porous vitrified grinding wheel structure, which functions as the core of the vitrified grinding wheel 10. The aggregates have a particle size of, for example, about #60 to #500 (JIS B4130), and the vitrified binder contains, for example, 40 to 60 mass% SiO2, 10 to 30 mass% Al2O3, 5 to 25 mass% BO3, and 1 to 15 mass% oxides. The pores are, for example, 20 to 50 volume %, and the base layer 14 is porous and can be impregnated with resin.

[0022] Similarly, the grinding wheel layer 16 contains superabrasive grains such as CBN grains and diamond grains, a glassy vitrified bond, and interconnected pores. The superabrasive grains are bonded together by the vitrified bond, forming a porous vitrified grinding wheel structure. This structure functions as the grinding wheel portion of the vitrified grinding wheel 10. The superabrasive grains are typically cubic boron nitride (CBN) or diamond. The superabrasive grains have a particle size of, for example, #80 to #600 (JIS B4130). The vitrified bond is the same or similar to that of the base layer 14, and contains, for example, 40 to 60 mass% SiO2, 10 to 30 mass% Al2O3, 5 to 25 mass% BO3, and 1 to 15 mass% oxides. The pores are, for example, 25 to 40 volume %, making the grinding wheel layer 16 porous and resin-impregnable.

[0023] In the vitrified grinding wheel 10, for example, the adjacent base layer 14 and grinding wheel layer 16 are fired simultaneously, so that the base layer 14 and grinding wheel layer 16 are integrally bonded to each other by the molten vitrified binder.

[0024] The base layer 14 of the vitrified grinding wheel 10 is entirely impregnated with resin, making it difficult for the grinding fluid to penetrate, and preventing the center of gravity from being shifted unidirectionally due to the infiltrated grinding fluid, thereby preventing deterioration of dynamic balance. Suitable resins used for resin impregnation include thermosetting resins such as epoxy resin, acrylic resin, phenolic resin, melamine resin, alkyd resin, and urea resin.

[0025] Fig. 2 is a process diagram illustrating the manufacturing process of the vitrified grinding wheel 10. In Fig. 2, in a raw material preparation step P1, aggregate, a vitrified binder, and a binder such as dextrin, which are materials for the base layer 14, are prepared and kneaded. Also, abrasive grains, a vitrified binder, and a binder such as dextrin, which are materials for the grinding wheel layer 16, are prepared and kneaded.

[0026] Next, in the press molding process P2, a circular molded body preformed from the kneaded material of the base layer 14 is placed in the center of a ring-shaped mold for press molding (not shown), and the kneaded material of the grinding wheel layer 16 is filled into the ring-shaped space between the outer peripheral surface of the molded body and the side wall of the mold, and then the material in the mold is press molded.

[0027] Next, in the firing step P3, the compact press-molded in the press molding step P2 is fired at a firing temperature that melts the vitrified binder, for example, at a temperature of about 1000° C. This firing melts the vitrified binder, so that the base layer 14 and the grinding wheel layer 16 are integrally bonded together.

[0028] In the impregnation jig mounting step P4, as shown in FIG. 3, an impregnation jig 20 is mounted on the fired vitrified grinding wheel 10 before being impregnated with resin. The impregnation jig 20 has an outer diameter smaller than the outer diameter of the base layer 14, i.e., the diameter of the boundary surface 36, by a predetermined value, for example, approximately 5 to 10 mm. The impregnation jig 20 includes a pair of disk-shaped jigs, a lower holding jig 24 and an upper holding jig 25, which hold the base layer 14 concentrically and liquid-tightly in a thicknesswise direction via a sheet-like packing 22. A connection flange 28 is fixed to the upper holding jig 25 via the packing 22 so as to close a central hole 25a of the upper holding jig 25, forming an airtight and liquid-tight space 26 surrounded by the inner circumferential surface 14a of the base layer 14, the upper holding jig 25, and the lower holding jig 24. A pressure supply pipe 32 connects a compressed air supply device 30, such as a compressor, to the connection flange 28 and supplies compressed air into the space 26. A mixed, fluidized two-component epoxy resin 34 is previously contained within the space 26.

[0029] In the resin impregnation step P5, as shown in FIG. 4, the pressure in the space 26 is increased by compressed air supplied through the pressure supply pipe 32, and the two-component epoxy resin 34 is uniformly applied to the inner circumferential surface 14a of the base layer 14. This uniform application of pressure is continued until the fluid two-component epoxy resin 34 oozes out from the outer circumferential edge of the disk-shaped upper holding jig 25 or the lower holding jig 24 or until air bubbles are generated. This uniform application of pressure causes the two-component epoxy resin 34 to advance radially from the inner circumferential surface 14a of the base layer 14 toward the grinding wheel layer 16, with the radial impregnation distance (impregnation depth) from the inner circumferential surface 14a being uniform around the base layer 14 and uniform across the thickness of the base layer 14. This impregnation changes the liquid level of the two-component epoxy resin 34 in the space 26 from the dashed line to the solid line. Then, in the resin impregnation stopping step P6, when it is detected by visual inspection or a camera that the two-component epoxy resin 34 in a fluid state has seeped out from the outer peripheral edge of the upper holding jig 25 or the lower holding jig 24, the two-component epoxy resin 34 has almost reached the outer peripheral edge of the upper holding jig 25 or the lower holding jig 24, i.e., the boundary surface 36 between the base layer 14 and the grinding stone layer 16, and the uniform pressure application is immediately stopped. In this state, as shown in Fig. 5, the two-component epoxy resin 34 has impregnated almost the entire base layer 14. The diagonal lines in Fig. 5 indicate a resin-impregnated region 38 of the two-component epoxy resin 34 in the base layer 14, and the tip of the resin-impregnated region 38 is close to or has reached the boundary surface 36.

[0030] In the resin curing step P7, the vitrified grinding wheel 10, from which the impregnation jig 20 has been removed, is placed in a thermostatic bath, and the two-component epoxy resin 34 that has impregnated substantially the entire base layer 14 of the vitrified grinding wheel 10 is cured. In the thermostatic bath, the resin is maintained at a temperature of about 50°C for 12 hours, for example. Next, in the finishing step P8, finishing processes such as finishing the inner peripheral surface, outer peripheral surface, and side surface of the mounting hole 12 are performed, thereby obtaining the vitrified grinding wheel 10 shown in FIG.

[0031] As described above, in the method for manufacturing the vitrified grinding wheel 10 of this embodiment, a pair of upper and lower holding jigs 25 and 24 having the same diameter or smaller than the base layer 14 are held in close contact with the base layer 14, and the fluid two-component epoxy resin 34 (fluid resin) is impregnated into the base layer 14 from the inner peripheral surface 14a toward the outer periphery in the radial direction, and as soon as the fluid two-component epoxy resin 34 oozes out from the outer peripheral ends of the pair of upper and lower holding jigs 25 or 24, the resin impregnation is immediately stopped, and the fluid two-component epoxy resin 34 (fluid resin) impregnated into the base layer 14 is cured. This manufactures a vitrified grinding wheel 10 in which the entire base layer 14, except for the grinding wheel layer 16, is accurately impregnated with the resin.

[0032] Furthermore, according to the manufacturing method of the vitrified grinding wheel 10 of this embodiment, the impregnation jig mounting step P4 uses a pair of disk-shaped upper holding jigs 25 or lower holding jigs 24, and the pair of upper holding jigs 25 or lower holding jigs 24 are brought into liquid-tight contact with the base layer 14 while sandwiching the base layer 14 in the thickness direction. As a result, by immediately stopping the resin impregnation when the two-component epoxy resin 34 in a fluid state (fluid resin) begins to seep out from the outer peripheral edge of the upper holding jig 25 or lower holding jig 24, it can be seen that the entire base layer 14, except for the grinding wheel layer 16, has been accurately impregnated with the fluid resin (the two-component epoxy resin 34 in a fluid state).

[0033] Furthermore, according to the manufacturing method of the vitrified grinding wheel 10 of this embodiment, the resin impregnation step P5 uniformly pressurizes the two-component epoxy resin 34 in a fluid state onto the entire inner circumferential surface 14a of the base layer 14, thereby impregnating the base layer 14 with the fluid resin. This allows the fluid resin to progress radially outward within the base layer 14, and the radial penetration distance (impregnation depth) from the inner circumferential surface 14a is uniform in the circumferential direction of the base layer 14 and uniform in the thickness direction of the base layer 14.

[0034] Furthermore, according to the manufacturing method of the vitrified grinding wheel 10 of this embodiment, in the resin impregnation step P5, the two-component epoxy resin 34 in a fluid state is confined in the airtight space 26 surrounded by the inner peripheral surface 14a of the base layer 14 and the pair of disc-shaped upper and lower holding jigs 25 and 24, and pressure is applied to the space 26. This allows the fluid resin to be evenly applied to the inner peripheral surface 14a of the base layer 14.

[0035] Furthermore, according to the manufacturing method of the vitrified grinding wheel 10 of this embodiment, when seepage of the fluid two-component epoxy resin 34 (fluid resin) occurs at the outer peripheral end of the disc-shaped lower holding jig 24 or the upper holding jig 25, the resin impregnation stopping step P6 stops the impregnation of the fluid resin into the base layer 14 by stopping the uniform pressure of the fluid resin (fluid two-component epoxy resin 34) on the inner peripheral surface 14a of the base layer 14. As a result, the impregnation of the fluid resin into the base layer 14 is immediately stopped with the entire base layer 14 impregnated with the fluid resin (fluid two-component epoxy resin 34).

[0036] Furthermore, according to the manufacturing method of the vitrified grinding wheel 10 of this embodiment, the resin impregnated into the base layer 14 is the two-component epoxy resin 34, the fluid resin is a fluid epoxy resin mixture mixed with the two-component epoxy resin 34, and the resin curing step P7 is a step of curing the fluid epoxy resin mixture (two-component epoxy resin 34) by heating. This causes the fluid epoxy resin mixture (two-component epoxy resin 34) impregnated into the base layer 14 to be cured.

[0037] Although one embodiment of the present invention has been described in detail above with reference to the drawings, the present invention is not limited to this embodiment and can be implemented in other modes.

[0038] For example, in the above-described embodiment, it is explained that the outer diameters of the disk-shaped upper holding jig 25 and lower holding jig 24 are the same as or smaller by a predetermined value, for example, about 5 to 10 mm, than the diameter of the base layer 14. This predetermined value is experimentally set in advance in accordance with the viscosity of the fluid resin and the base layer 14 so that the radial impregnation distance (impregnation depth) from the inner circumferential surface 14a of the fluid resin (two-component epoxy resin 34 in a fluid state) approximately coincides with the boundary surface 36.

[0039] The above is merely one embodiment, and although other examples will not be given, the present invention can be implemented in various forms with various modifications and improvements based on the knowledge of those skilled in the art within the scope of the present invention. [Explanation of symbols]

[0040] 10: Vitrified grinding wheel (resin-impregnated super abrasive vitrified grinding wheel) 14: Base layer 16: Grindstone layer 20: Impregnation jig 24: Lower holding jig (disc-shaped jig) 25: Upper holding jig (disc-shaped jig) 26: Space 28: Connection flange 30: Compressed air supply device 32: Pressure supply pipe 34: Two-component epoxy resin (fluid epoxy resin mixture) 36: Boundary 38: Resin impregnation area

Claims

1. A method for manufacturing a resin-impregnated superabrasive vitrified grinding wheel, comprising: a circular base layer having a mounting hole and a vitrified grinding wheel structure; and a circular grinding wheel layer having the same thickness as the base layer and also having a vitrified grinding wheel structure, which are integrally formed with the base layer, and the entire base layer is impregnated with resin, a jig mounting process in which a pair of disk-shaped jigs, a lower holding jig and an upper holding jig having a diameter equal to or smaller than that of the base layer, are brought into close contact with the base layer while sandwiching the base layer and being concentric with the base layer, thereby forming an airtight space within the mounting hole and the central hole; a resin impregnation step of placing a fluidized resin in the space and impregnating the base layer from the inner circumferential surface of the mounting hole toward the outer circumferential surface in the radial direction; a resin impregnation stopping step of stopping the resin impregnation when the resin in the fluid state starts to seep out from the outer peripheral ends of the pair of disk-shaped jigs; a resin curing step of curing the fluid resin impregnated in the underlayer. A method for producing a resin-impregnated superabrasive vitrified grinding wheel, comprising:

2. The jig mounting step uses the lower holding jig and the upper holding jig, and the lower holding jig and the upper holding jig are brought into liquid-tight contact with the base layer with the base layer sandwiched between them via a sheet-like packing.

2. The method for producing a resin-impregnated superabrasive vitrified grinding wheel according to claim 1.

3. The resin impregnation step is performed by uniformly pressurizing the fluid resin over the entire inner circumferential surface of the mounting hole in the base layer, thereby impregnating the fluid resin into the base layer.

2. The method for producing a resin-impregnated superabrasive vitrified grinding wheel according to claim 1.

4. The resin impregnation step includes supplying compressed air into the airtight space surrounded by the inner circumferential surface of the mounting hole of the base layer and the pair of disk-shaped jigs while the fluid resin is confined in the airtight space.

4. The method for producing a resin-impregnated superabrasive vitrified grinding wheel according to claim 3.

5. The resin impregnation stopping step stops the impregnation of the fluid resin into the base layer by stopping the uniform pressure of the fluid resin on the inner circumferential surface of the mounting hole of the base layer.

5. The method for producing a resin-impregnated superabrasive vitrified grinding wheel according to claim 4.

6. The resin is a two-component epoxy resin, the fluid resin is a fluid epoxy resin mixture in which the two-component epoxy resin is mixed, and the resin curing step is to cure the fluid epoxy resin mixture by heating.

2. The method for producing a resin-impregnated superabrasive vitrified grinding wheel according to claim 1.

7. A resin-impregnated superabrasive vitrified grinding wheel, comprising a circular base layer having a mounting hole and a vitrified grinding wheel structure, and a circular grinding wheel layer having the same thickness as the base layer and a vitrified grinding wheel structure, which are integrally formed, and the entire base layer is impregnated with resin, the base layer and the grinding wheel layer are bonded together by a molten vitrified bond; The entire base layer is impregnated with resin, except for the grinding stone layer. A resin-impregnated superabrasive vitrified grinding wheel characterized by:

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