JP2986412B2 - Rotary dresser - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rotary dresser. More specifically, the present invention relates to a rotary dresser which has a small distortion on the diamond layer surface, can reduce the amount of shape modification, is easy to manufacture, and has excellent durability.

[0002]

2. Description of the Related Art A diamond rotary dresser is a rotary dresser in which diamond abrasive grains are embedded and fixed on the outer peripheral surface of a roll, and transfers the shape of the dresser to the grinding wheel by pressing the grinding wheel while rotating the dresser. It is. Diamond rotary dresser can significantly reduce dressing time, high reproducibility of dressing accuracy, easy high-level automation,
Since the grinding cost can be reduced, it is widely used. Diamond rotary dressers are classified into sintered rotary dressers and electroformed rotary dressers according to their manufacturing methods. Sintered rotary dresser is made by densely hand-grafting diamond abrasive grains on the outer surface of the dresser and then fixing it with sintered metal.It has excellent durability, but it is easily deformed by heat during sintering, and its shape is modified. There is a problem that it takes time. Electroformed rotary dresser
The diamond abrasive grains are fixed with metal by electroplating, and the temperature in the manufacturing process is lower than that of sintering. Can be manufactured relatively easily. The electroformed rotary dresser is usually filled with diamond abrasive grains on the inner peripheral surface of the matrix, and after temporarily fixing one layer of the diamond abrasive grains to the inner peripheral surface of the matrix by electroplating, excess diamond abrasive grains are removed. The diamond abrasive grains are fixed by electroforming by electroplating. In a conventional electroformed rotary dresser, a diamond layer and a core metal are joined by pouring and solidifying a molten material of a low melting alloy such as a tin-bismuth alloy or a tin-lead alloy into a gap therebetween. But,
Although the temperature of the low-melting alloy reached about 200 ° C., the difference in the coefficient of thermal expansion of the constituent materials and the shrinkage during solidification of the alloy caused distortion and deformation of the diamond layer surface. As a result, there is a problem that a correction work for removing distortion is required, which hinders sharpness, or that the work requires a long time. The present inventors have previously developed a rotary dresser having a resin layer on the inner periphery of a diamond layer, and the resin layer is fixed to a core metal with an adhesive, reducing distortion of the diamond layer surface, and reducing the shape of the diamond layer. The amount of correction was successfully reduced. FIG. 1 is a sectional view of a rotary dresser invented by the present inventors first. The rotary dresser of this figure has a resin layer 2 on the inner periphery of a diamond layer 1, and the resin layer is fixed to a core metal 3 by an adhesive. Such a rotary dresser fills the inner peripheral surface of a matrix with diamond abrasive grains, temporarily fixes one layer to the inner peripheral surface of the mother die by electroplating, removes excess diamond abrasive grains, and performs electroforming. A diamond layer is formed by fixing diamond abrasive grains, and a resin layer is formed by further curing the resin on the inner periphery of the diamond layer. The resin layer is fixed to a metal core with an adhesive. it can. Since such a rotary dresser is not exposed to high temperatures in the manufacturing process, it does not generate distortion due to thermal expansion or contraction, and shortens or eliminates the time required for the work of repairing the diamond abrasive layer. Can be. However, FIG.
In the rotary dresser shown in (1), since the resin layer and the core metal are bonded with an adhesive, a satisfactory bonding strength may not always be obtained. In addition, since the end face 4 of the resin layer is exposed, not only is it difficult to say that the appearance is good,
The end face of the resin layer may be damaged by the impact, and the resin layer may be eroded by dressing liquid during dressing. This makes it easy to join the resin layer and the metal core, stably bond the resin layer to the metal core, and develop a rotary dresser in which the resin layer is mechanically and chemically protected at the end face. Was required.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a rotary dresser having a diamond layer having a resin layer on the inner peripheral surface of the diamond layer and having a small distortion. Another object of the present invention is to provide a highly accurate rotary dresser in which a resin layer is protected mechanically and chemically.

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventors have provided screws on the inner peripheral surface of the resin layer and the outer peripheral surface of the core metal, and attached the core metal to the resin. By screwing into the layer, the joining work is facilitated, the joining strength is improved, and the core is divided into two parts,
It has been found that the joining strength can be further improved and the end face of the resin layer can be protected, and the present invention has been completed based on this finding. That is, the present invention provides (1) a resin layer on the inner periphery of a diamond layer, wherein a female screw is provided on an inner peripheral surface of the resin layer, and a male screw is provided on an outer peripheral surface of a cored bar, and A rotary dresser characterized in that the core is screwed into the resin layer, (2) the core is composed of two parts, a first core and a second core, and the screw is screwed into the resin layer by a screw. The first core metal to be attached has a gap between the resin layer and a part of the outer peripheral surface so as not to contact the resin layer, and a male screw is provided on the outer peripheral surface not in contact with the resin layer, A female screw threaded with the male screw is provided on the inner peripheral surface of the cored bar, and the gap between the first cored bar and the resin layer such that the outer peripheral surface of the second cored bar contacts the inner peripheral surface of the resin layer. (1) The rotary dresser according to (1), wherein both end surfaces of the resin layer are covered with annular portions provided at both outer ends of the core bar. (4) The rotary dresser according to the above (2) or (3), wherein the outer peripheral surface of the second core has an air escape groove, and (5) contact between the core and the resin layer. Item (1), Item (2), Item (3) or Item
(4) The rotary dresser according to (4), (6) the resin layer, wherein metal powder or metal compound powder is mixed into the resin layer;
(2) The rotary dresser according to (3), (4) or (5), (7) the rotary dresser according to (6), wherein the metal powder is aluminum powder, (8) (4) The rotary dresser according to (6), wherein the metal powder is tungsten powder; and (9) the rotary dresser according to (1), (2), or (4), wherein the resin constituting the resin layer is an epoxy resin.
(3) The present invention provides a rotary dresser according to the above (4), (5), (6), (7) or (8).

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 2 is a cross-sectional view of one embodiment of the rotary dresser of the present invention. FIG. 2A is a cross-sectional view of a diamond layer and a resin layer, and FIG. 2B is a cross-sectional view of a cored bar.
FIG. 2C is a cross-sectional view showing a state where the core metal is screwed into the resin layer. As shown in FIG. 2A, a resin layer 2 is provided on the inner periphery of the diamond layer 1, and the inner peripheral surface of the resin layer is processed so as to be in contact with the outer peripheral surface of the metal core, and a female screw 5 is provided. Have been. As shown in FIG. 2 (b), the outer peripheral surface of the cored bar 3 is processed so as to be in contact with the inner peripheral surface of the resin layer, and the male screw screwed into the female screw provided on the inner peripheral surface of the resin layer. A screw 6 is provided. By screwing the core metal into the resin layer using male and female screws, a rotary dresser shown in FIG. 2C is obtained. Since the joining between the core metal and the resin layer is performed by screws, the joining operation is easy, the joining strength is large, and a highly accurate rotary dresser can be obtained.
FIG. 3 is a sectional view of another embodiment of the rotary dresser of the present invention. The rotary dresser of the present embodiment has a resin layer 2 on the inner periphery of a diamond layer 1, and the core includes a first core 7 and a second core 8. The first metal core is provided with a male screw that is screwed with a female screw provided in the resin layer. The outer diameter of the first core metal is reduced so that the outer core is not in contact with the resin layer on a part of the outer peripheral surface. A male screw that is screwed with a female screw provided on the second metal core is provided on an outer peripheral surface having a gap and not in contact with the resin layer. The second metal core has a shape that fills a gap between the first metal core and the resin layer. An outer peripheral surface of the second metal core is in contact with an inner peripheral surface of the resin layer, and a female screw provided on the inner peripheral surface is provided. Is screwed into the gap between the first metal core and the resin layer so as to screw with a male screw provided on the outer peripheral surface of the first metal core. In the rotary dresser of this aspect, the annular portion 9 is provided at the outer ends of the first core metal and the second core metal, and when the core metal is screwed into the resin layer and joined, the annular portion forms the resin layer. Is coated. In the rotary dresser of the embodiment shown in FIG. 3, the joining between the core metal and the resin layer is performed by screws, and the joining is performed in a state where the resin layer is sandwiched between the two core metals, so that the joining operation is easy,
The joining strength and accuracy are further improved. In addition, since the end surface of the resin layer is covered with the annular portion provided on the cored bar, the appearance is good, the end surface of the resin layer is not damaged by impact, and a grinding fluid is used during use. This does not cause swelling or erosion of the resin layer.

One embodiment of the method for manufacturing a rotary dresser of the present invention will be described below. First, the inner peripheral surface of the matrix 10 is filled with diamond abrasive grains, and one layer thereof is temporarily fixed to the inner peripheral surface of the matrix by electroplating. There is no particular limitation on the method of filling the inner peripheral surface of the matrix with diamond abrasive grains, and the inner peripheral surface of the mother die immersed in a plating bath can be filled with diamond abrasive grains, or the inner peripheral surface of the master die can be filled. After the surface is filled with diamond abrasive grains, it can be immersed in a plating bath.
A cathode is connected to a matrix having an inner peripheral surface filled with diamond abrasive grains, and an anode is connected to a plating solution to perform electroplating. The metal to be plated can be used without any particular limitation as long as it can temporarily fix diamond abrasive grains. For example, nickel, copper, chromium and the like can be suitably used. When one layer of the diamond abrasive grains is temporarily fixed and does not fall off from the inner peripheral surface of the mother die, excess diamond abrasive particles are removed from the inner peripheral surface of the mother die, and electroplating is continued to further remove the diamond abrasive particles. Is fixed by electroforming to form a diamond layer 1. Next, the resin layer 2 is formed by curing the resin on the inner periphery of the diamond layer. The resin to be used is not particularly limited, but a room-temperature curing type resin is preferable from the equipment side because it does not require a special heating device, and from the aspect of dimensional stability because there is no dimensional change due to heating and cooling. Is also preferred. Examples of such a resin include a phenol resin, a melamine resin, and an epoxy resin, and a room temperature-curable two-pack type epoxy resin can be particularly preferably used.

In the rotary dresser of the present invention, metal powder or metal compound powder can be mixed into the resin layer. Examples of the metal powder to be mixed include powders of aluminum, titanium, chromium, manganese, iron, cobalt, nickel, copper, zinc, molybdenum, silver, indium, tin, tantalum, tungsten, and the like.
As the metal compound powder to be mixed, for example, alumina,
Calcium carbonate, titanium oxide, tantalum carbide, tantalum boride, tantalum nitride, tantalum oxide, tantalum silicide,
Powders such as tungsten carbide, tungsten boride, tungsten nitride, tungsten oxide, and tungsten silicide can be given. In the rotary dresser of the present invention, among these, aluminum powder and tungsten powder can be particularly preferably used. Aluminum powder has good wettability with a resin, a small shrinkage rate after a certain period of time, and a large reinforcing effect per unit weight. The amount of aluminum powder contained in the resin layer is preferably 30 to 60% by weight of the resin layer, and more preferably 40 to 50% by weight of the resin layer. Tungsten powder has a high density, and the density of the resin layer can be set to 4 to 7 g / cm ³ to approximate the density of the core metal. By bringing the density of the resin layer close to the density of the core metal, the weight balance of the rotary dresser is improved, the amount of imbalance is reduced, and a high level of skill and long time balancing work performed by drilling holes in the core metal Is little or no need. There is no particular limitation on the method of curing the resin that forms the resin layer.For example, a bottom plate is attached to the matrix and the diamond layer, and the resin mixed with the powder and mixed with a curing agent is cast and allowed to stand. Cured, or attached a side plate on both sides of the matrix and diamond layer, pour the resin mixed with the above powder while rotating and mix the curing agent,
The resin can be cured while being pressed against the diamond layer by centrifugal force.

FIG. 4 is an explanatory view of one embodiment of a process for forming a resin layer by curing the resin. Side plates 11 are attached to both sides of the matrix 10 and the diamond layer 1 formed on the inner peripheral surface thereof, and a resin 12 is poured from the center while rotating. The resin is pressed against the diamond layer by centrifugal force and hardens while leaving a space in the center. When the resin is cured under centrifugal force, a force always acts in the direction of pressing the diamond layer against the resin, the diamond layer is not pulled inward due to shrinkage due to the curing of the resin, and there is little risk of distortion of the diamond layer It is preferred. Also,
When the resin is cured under centrifugal force, the central portion where the core metal is to be mounted becomes hollow, and the amount of the resin layer to be removed by cutting can be reduced as compared with the case where the resin is cured under standing. After the resin is cured at room temperature under centrifugal force, the resin is cured in a thermostat.
Holding at 0 to 100 ° C. for 2 to 5 hours is more preferable because the stability after curing is improved and deformation becomes difficult. After the curing of the resin is completed, the side plate is removed, and the resin layer is cut. FIG. 5 is a cross-sectional view showing one aspect of a cutting state of the resin layer. In the resin layer 2, a female screw 5 to be screwed with a male screw provided in the first metal core to be attached is processed.
FIG. 6 is a cross-sectional view showing a state where the first metal core is screwed. The first core is screwed into the resin layer by screwing the female screw of the cut resin layer and the male screw of the first core. One end surface of the resin layer is covered with the annular portion 9 of the first metal core. The first core is provided with a male screw 6 to be screwed with the female screw provided on the second core. When the first metal core is screwed into the resin layer, a gap 13 for screwing the second metal core exists between the first metal core and the resin layer.

In the rotary dresser of the present invention, the contact surface between the first metal core and the resin layer, the contact surface between the second metal core and the resin layer, and the contact surface between the first metal core and the second metal core are formed. Can be fixed with an adhesive. By fixing the contact surface with an adhesive in addition to the screwing of the male screw and the female screw, the bonding between the metal core and the resin layer is further strengthened. As the adhesive, an adhesive having a pot life longer than the time required for the screwing of the first core metal and the screwing of the second core metal is selected and applied to the contact surface in advance before the screwing of the core metal. Keep it. The adhesive to be used is not particularly limited, and for example, a two-pack type epoxy adhesive can be suitably used, and a room temperature-curable adhesive is particularly preferable because it does not cause distortion due to heating and cooling. Since the gap between the contact surfaces is usually about 0.1 to 0.2 mm, the effect of volume shrinkage due to the curing of the adhesive is small, and the distortion generated in the diamond layer is extremely small. FIG. 7A is a cross-sectional view showing a state in which the second metal core is being screwed, and FIG. 7B is a cross-sectional view taken along line AA. The second metal core 8 is provided with a female screw that is screwed with the male screw provided on the first metal core 7, and the outer peripheral surface of the second metal core is in contact with the inner peripheral surface of the resin layer. It is screwed into the gap between the first metal core and the resin layer. In the rotary dresser of the present invention, it is preferable to provide the air escape groove 14 on the outer peripheral surface of the second metal core. There is no particular limitation on the shape of the air escape groove, for example,
The groove may be a linear groove parallel to the central axis, or may be a spiral groove relative to the central axis. The number of air release grooves provided on the outer peripheral surface of the second metal core is not particularly limited, but is preferably 2 to 5 in general. By providing an air escape groove, when the second core is screwed into the gap 13 between the first core and the resin layer, the air in the gap is easily exhausted, and the adhesive is applied particularly to the contact surface. In this case, the screwing of the second core metal can be performed smoothly. FIG. 8 is a cross-sectional view showing a state in which the screwing of the second core has been completed. The second metal core 8 is formed of the first metal core 7 and the resin layer 2.
Of the second metal core is screwed in a state of filling the gap of
Covers and protects one end face of the resin layer. Finally, the matrix 10 is removed to complete the rotary dresser of the present invention shown in FIG. In the manufacture of the rotary dresser of the present invention, one or two cores can be machined into the shape of the finished product before screwing, or a gripping bar protruding outside the finished product of the rotary dresser. After the core is screwed in, the gripping margin is removed by grinding to obtain a finished rotary dresser. Providing the core bar with a margin makes it easy to screw the core bar.

FIG. 9 is a sectional view of another embodiment of the rotary dresser of the present invention. The rotary dresser of the present embodiment has a resin layer 2 on the inner periphery of a diamond layer 1, and the core includes a first core 7 and a second core 8. The inner peripheral surface of the resin layer is screwed with the first core metal and the second core metal.
Female screws are provided. The first metal core is provided with a male screw that is screwed with a female screw provided in the resin layer. The outer diameter of the first core metal is reduced so that the outer core is not in contact with the resin layer on a part of the outer peripheral surface. Has gaps. The second metal core has a shape that fills a gap between the first metal core and the resin layer, and is provided with a male screw that is screwed with a female screw provided in the resin layer. After screwing the first metal core, the second metal core is brought into contact with the outer peripheral surface of the first metal core whose outer peripheral surface has become smaller,
The male screw provided on the outer peripheral surface of the second metal core is screwed into the gap between the first metal core and the resin layer so as to screw with the female screw provided on the internal peripheral surface of the resin layer. Alternatively, the order of screwing the cores may be reversed, and the first core may be screwed after the second core is screwed. In the rotary dresser of this aspect, the annular portion 9 is provided at the outer ends of the first core metal and the second core metal, and when the core metal is screwed into the resin layer and joined, the annular portion forms the resin layer. Is coated. The rotary dresser of the embodiment shown in FIG. 9 is easy to work because two male screws provided on the first and second cores and two female screws provided on the resin layer have the same dimensions. Since the joining between the core metal and the resin layer is performed by screws, the joining operation is easy, and the joining strength and accuracy are increased. In addition, since the end surface of the resin layer is covered with the annular portion provided on the cored bar, the appearance is good, the end surface of the resin layer is not damaged by impact, and a grinding fluid is used during use. This does not cause swelling or erosion of the resin layer. FIG. 10 is a sectional view of another embodiment of the rotary dresser of the present invention. In the rotary dresser of this embodiment, the annular portion 9 is not integrated with the first core metal 7 and the second core metal 8 but is a separate component. After the first metal core and the second metal core are screwed into and joined to the resin layer, two annular portions are joined to the end surface of the resin layer with an adhesive or the like, and the end surfaces of the resin layer are joined by the annular portions. Cover. The rotary dresser of the embodiment shown in FIG. 10 is easy to work because the shapes of the first core metal, the second core metal, and the annular portion are simple. Also, the end face of the resin layer is
As it is covered by the ring, it has good appearance,
The end surface of the resin layer is not damaged by the impact, and the resin layer does not swell or corrode due to the application of a grinding fluid during use. In the rotary dresser of the present invention, since the joining of the resin layer and the core metal is performed using the screwing of the screws, the working operation is easy, and the working accuracy and the joining strength are high.

[0011]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the present invention. Example 1 90 mm diameter at both ends, maximum diameter 95 mm at center, thickness 5
A 5-mm rotary dresser having the shape and structure shown in FIG. 3 was produced. A steel mother die having an outer diameter of 150 mm, an inner diameter of 90 mm at both ends, a maximum inner diameter of 95 mm at the center, and a thickness of 55 mm was machined by an NC lathe to mask portions other than the diamond layer. This master was immersed in a nickel plating bath made of a nickel sulfamate solution, and the inner peripheral surface of the master was filled with 40/50 natural diamond abrasive grains specified in JIS B 4130. Then, current was applied at a current density of 1 A / dm ² for 4 hours to temporarily fix one layer of diamond abrasive grains, and after removing excess diamond abrasive grains, the current density was further increased to ^{2 A} / dm ^2.
Nickel plating was continued for 90 hours at dm ² to finally form a diamond layer having a thickness of 3 mm. Two side plates made of acrylic resin are attached to the matrix and the diamond layer, and the epoxy resin [Nippon Ciba Kaigie Co., Ltd. AV1] is rotated while rotating.
38] 100 parts by weight, hardener [Nippon Ciba Kaigie Co., Ltd. H
Y998] 40 parts by weight and tungsten powder (# 150
0) 514 parts by weight of the mixture was injected, and the mixture was cured at room temperature for 1 hour while the resin mixture was pressed against the diamond layer by centrifugal force. After the rotation was stopped and left for 1 day, it was placed in a thermostat and kept at 70 ° C. for 3 hours. A cylindrical hole with a diameter of 80 mm is ground in the resin layer, and both ends are 2 mm wide and 8 mm in diameter.
6mm, and M82 × 1.0 on one end
A female screw with a thread length of 10 mm was machined. 86mm in diameter, 2mm in thickness, 80mm in diameter, 33mm in thickness and 71mm in diameter, 20mm in thickness
It has a hole of 43mm diameter in the center, M82 × 1.0 at one end of 80mm diameter part, male screw of 10mm screw length, M72 × 1.0 at end of 71mm diameter part, screw length 1
A first metal core having the shape shown in FIG. 6 and having a male screw of 0 mm was manufactured using an iron material (S45C). further,
86mm diameter, 2mm thick cylindrical shape and 80mm diameter, 1 thickness
It is a stack of 8mm cylinders, has a hole of 71mm diameter in the center, M72 × 1.0 at the end of the inner peripheral surface, has a female thread of 10mm long, and has a width of 80mm on the outer circumference. A second metal core having the shape shown in FIG. 7 having three linear air escape grooves parallel to the central axis having a diameter of 3 mm and a depth of 2 mm was fixed to an iron material (S
45C). Epoxy resin [Nippon Ciba Kaigie Co., Ltd. AV138] on the contact surface between the first core metal and the resin layer.
100 parts by weight and a curing agent [Nippon Ciba Kaigie Co., Ltd. HY99
8] An adhesive mixed with 40 parts by weight was applied, and the first core was screwed into the resin layer to obtain a state shown in FIG. Further, the contact surface between the second mandrel and the resin layer and the second mandrel and the first
The same adhesive was applied to the contact surface of the metal core of No. 1 and the second metal core was screwed into the gap between the first metal core and the resin layer. The air escaped from the air escape groove, and the second cored bar could be smoothly screwed. After leaving at room temperature for one day, it was put in a thermostat and kept at 70 ° C. for 3 hours to cure the adhesive. Thereafter, the matrix was removed by cutting with an NC lathe, and the amount of protrusion of diamond abrasive grains was adjusted to 50 μm by dressing with an alumina grindstone.
The rotary dresser having the shape and the structure shown in FIG. The outer peripheral surface of the diamond layer of the obtained rotary dresser was measured with a roundness measuring device [Roncom 3 manufactured by Tokyo Seimitsu Co., Ltd.]
0B type], the roundness was 6 to 7 μm.
m. Furthermore, using a WA grinding stone (M), 200μ
After 100 rounds of the impact test of cutting at 0.1 mm at a speed of m / rev, the roundness was measured. The roundness after the impact test was 6 to 7 μm. Comparative Example 1 The diameter of the diamond layer at both ends was the same as in Example 1 and the diameter was 9
0 mm, the maximum diameter at the center is 95 mm, and the thickness is 55 mm.
A rotary dresser having the structure shown in (1) and having no screw provided on the core metal and the resin layer was produced. The diamond layer and the resin layer were formed by the same operation as in Example 1. Also, using an iron material (S45C), a cylindrical shape having a diameter of 80 mm and a thickness of 18 mm, a cylindrical shape having a diameter of 75 mm and a thickness of 19 mm and a diameter of 71 m
A core metal having a cylindrical shape having a diameter of 43 mm was formed at the center by stacking cylindrical shapes having a thickness of 18 mm and a thickness of 18 mm. The resin layer is cut according to the shape of the iron core, and the epoxy resin [Nippon Ciba Kaigie] is applied to the surface of the iron core and the surface of the cut resin layer.
An adhesive obtained by mixing 100 parts by weight of [AV138 Co., Ltd.] and 40 parts by weight of a curing agent [Nippon Cibakaigie Co., Ltd. HY998] was applied, and a core was inserted into the resin layer. After leaving at room temperature for one day, it was put in a thermostat and kept at 70 ° C. for 3 hours to cure the adhesive. Thereafter, the matrix was cut and removed with an NC lathe, and the amount of protrusion of the diamond abrasive grains was reduced to 50 μm by dressing with an alumina grindstone to complete a rotary dresser having the shape and structure shown in FIG. The roundness was measured in the same manner as in Example 1. The roundness of the outer peripheral surface of the diamond layer of the obtained rotary dresser was 8 to 9 μm. The roundness after repeating the impact test 100 times is 1
It was 2 to 15 μm. From the results of Example 1 and Comparative Example 1, the dresser of the present invention in which the core metal and the resin layer were joined with the screw and the adhesive was used. It turns out that the accuracy is better than the dresser. Furthermore, the joining work between the core metal and the resin layer
The dresser of the present invention was much easier than the dresser of Comparative Example 1.

[0012]

According to the rotary dresser of the present invention, since the diamond layer is held by the resin layer and the resin layer is joined to the core metal by screws, the distortion of the diamond layer surface is small, the fabrication is easy, and the machining accuracy and Excellent bonding strength. Further, by applying an adhesive to the contact surface between the resin layer and the core metal, the bonding strength is further improved, and by providing an annular portion on the core metal to cover the end surface of the resin layer, the end surface of the resin layer is coated. Scratches and erosion can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rotary dresser invented by the present inventors first.

FIG. 2 is a cross-sectional view of one embodiment of the rotary dresser of the present invention.

FIG. 3 is a sectional view of another embodiment of the rotary dresser of the present invention.

FIG. 4 is a diagram illustrating one embodiment of a process of forming a resin layer by curing the resin.

FIG. 5 is a cross-sectional view showing one aspect of a cutting state of the resin layer.

FIG. 6 is a cross-sectional view showing a state where a first core is screwed.

FIG. 7 is a cross-sectional view showing a state in which the second core is being screwed.

FIG. 8 is a cross-sectional view showing a state in which the screwing of the second core has been completed.

FIG. 9 is a sectional view of another embodiment of the rotary dresser of the present invention.

FIG. 10 is a sectional view of another embodiment of the rotary dresser of the present invention.

FIG. 11 is a sectional view of a rotary dresser manufactured in Comparative Example 1.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Diamond layer 2 Resin layer 3 Core 4 End face 5 Female screw 6 Male screw 7 First core 8 8 Second core 9 Ring part 10 Master block 11 Side plate 12 Resin 13 Gap 14 Air escape groove

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-64778 (JP, A) JP-A-2-110463 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B24B 53/053 B24B 53/12

Claims (9)

(57) [Claims] 1. A resin layer is provided on an inner periphery of a diamond layer, a female screw is provided on an inner peripheral surface of the resin layer, and a male screw is provided on an outer peripheral surface of a core metal. A rotary dresser characterized by being screwed into a layer. 2. A metal core comprising a first metal core and a second metal core, wherein the first metal core screwed to the resin layer by a screw is formed of a resin layer on a part of the outer peripheral surface. A female screw having a gap between the resin layer and the outer peripheral surface not in contact with the resin layer so as not to be in contact with the inner peripheral surface of the second cored bar; 2. The rotary dresser according to claim 1, wherein the second core is screwed into a gap between the first core and the resin layer such that an outer peripheral surface of the second core contacts an inner peripheral surface of the resin layer. 3. The rotary dresser according to claim 2, wherein both end surfaces of the resin layer are covered with annular portions provided at both outer ends of the cored bar. 4. The rotary dresser according to claim 2, wherein an air escape groove is provided on an outer peripheral surface of the second metal core. 5. The rotary dresser according to claim 1, wherein a contact surface between the core metal and the resin layer is fixed by an adhesive. 6. The rotary dresser according to claim 1, wherein the resin layer is mixed with a metal powder or a metal compound powder. 7. The rotary dresser according to claim 6, wherein the metal powder is an aluminum powder. 8. The rotary dresser according to claim 6, wherein the metal powder is a tungsten powder. 9. The resin according to claim 1, wherein the resin constituting the resin layer is an epoxy resin. Rotary dresser.