JP2841288B2 - Super-finishing wheel holder and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superfinishing wheel holder and a method for manufacturing the same. More specifically, the present invention relates to a super-finished grindstone holder that has excellent machining accuracy, has a long life, and can precisely finish the surface of a work material, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In order to finish a workpiece surface such as an outer surface of a cylinder, an inner surface of a hole, and a flat surface finished by a precision boring machine or a grinding machine into an extremely smooth surface in a short time, a processing method called super finishing is used. Has been adopted. In super finishing, a grinding wheel with an extremely small grain size and a relatively small degree of bonding is applied to the work material while pressing it with a low pressure on the surface of the work material, and at the same time, the grinding stone is This is a processing method in which vertical feed is performed while giving rapid vibration in the material axis direction to finish the surface of the work material over the entire length. In such superfinishing, a superfinishing stone housed in a square hole of a holder is used. At this time, a light pressure is applied to the superfinishing stone from a direction opposite to a side in contact with the workpiece. Therefore, in the superfinishing wheel, reciprocating motion occurs relative to the motion of the work material, and friction occurs between the wall surface of the square hole of the superfinishing wheel holder and the surface of the superfinishing wheel, and as a result,
The inner wall surface of the square hole of the super-finishing wheel holder wears out, and the dimensions of the square hole become too large to be used. Recently, a superfinishing wheel using superabrasive grains has been used, the life of the grinding wheel has been prolonged, and measures against wear of the holder have been attempted for the superfinishing wheel. But,
Since the square hole of the super-finishing stone holder and the super-finishing stone have a slight play fit, the super-finishing stone is reciprocating at a high speed on the inner wall surface of the square hole of the holder. It is inevitable that the grinding fluid enters a small gap between the grinding wheels. In this grinding fluid, damaged abrasive grains,
Since dirt, cuttings, and the like are mixed, the inner wall surface of the square hole of the holder is worn due to friction along with the reciprocating motion, the dimensions of the square hole are expanded, and the accuracy of the holder is deteriorated. As the precision of the holder deteriorates, micro-vibration perpendicular to the longitudinal direction of the grindstone occurs, and the finishing precision of the work material deteriorates. As a result, the finishing precision of the work material varies and becomes unstable. In addition, the finishing efficiency also decreases. In order to solve such a problem, the present applicant disclosed in Japanese Unexamined Patent Application Publication No. Hei 7-171756 a super-abrasion-resistant thin piece fixed to at least a part of an inner wall surface of a square groove or a square hole accommodating a super-finishing grindstone. A finishing whetstone holder was proposed. This super-finishing wheel holder has excellent wear resistance, the progress of wear on the inner wall of the square hole is slow, and the super-finishing wheel holder made of conventional cemented carbide needs to be replaced in about two weeks. In processing
It has a long service life of one year or more, is excellent in finishing accuracy of work material, and greatly contributes to streamlining process and improving quality. However, in this super-finished whetstone holder itself,
There was a problem that the work was not easy. That is,
This super-finish grinding wheel holder is a method of joining super-abrasive sintered bodies cut to a predetermined size by electrical discharge machining to both ends of a cemented carbide ground to a predetermined size by a diamond whetstone, polycrystalline on the outer surface of aluminum core A method of fixing a diamond thin film material, forming a body by winding and plating a thin copper wire on the outer surface of the diamond thin film material, further dissolving an aluminum core with alkali, a method of forming a square hole of a holder made of cemented carbide, It is manufactured by a method such as fixing a thin piece of superabrasive sintered body on the inner surface with an adhesive or brazing. Even among these methods, the work is still complicated even by the method of sticking a thin piece of superabrasive grain to the inner surface of the square hole with an adhesive, which is relatively simple, and the shrinkage due to curing of the adhesive is taken into account. Strict precision is required to ensure the parallelism of the dimensions of the superabrasive grains on both sides and the opposing surfaces of the flakes, and requires careful work. In rare cases, a trouble may occur in which the flakes of the superabrasive sintered body come off. Furthermore, in the case of a super-finished grindstone holder having a complicated shape, it is necessary to bond a large number of flakes of superabrasive sintered bodies along the shape of the inner surface of the holder, and it is not easy to achieve high accuracy. In the precision machining industry, there have been many holders with a single super-finishing wheel in the past, but with the improvement of machining efficiency, there are many types of holders, such as two-specification holders or specially shaped holders that match the shape of the workpiece. Has become necessary, and it has become difficult to cope with the conventional method. Therefore, there has been a demand for a super-finished grindstone holder having a high yield, capable of easily manufacturing a holder having a high dimensional accuracy, a long life, and a complicated shape, and a method of manufacturing the same.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a super-finished grindstone holder which is excellent in machining accuracy, has a long service life and can precisely finish the surface of a work material, and a method of manufacturing the same. It is a thing.

[0004]

The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that a super-abrasive sintered body having a super-abrasive grain content of 35 to 90% by volume has been produced. After joining the hard alloy, the super-finishing wheel holder, in which the square hole accommodating the super-finishing wheel was machined by electric discharge machining, at least the inner wall of the square hole on the side to the work material is made of super-abrasive sintered body, It has been found that it is easy to manufacture with high precision, has a long life, and can precisely finish the surface of a work material. Based on this finding, the present invention has been completed. That is, the present invention provides (1) a super-finishing wheel holder having a square hole for accommodating a super-finishing wheel, which is formed by joining a super-abrasive sintered body and a cemented carbide, at least on the side of the work material. A super-finish grinding wheel holder, wherein the inner wall of the square hole is formed of a super-abrasive sintered body having a super-abrasive content of 35 to 90% by volume; Super-abrasive sintered body having a square groove for accommodating a super-finishing grindstone from a portion to another end, wherein the inner wall of the side of the square groove on the work material has a super-abrasive grain content of 35 to 90% by volume The inner wall of the square groove on the other side is made of cemented carbide, and the lid for the work material is made of cemented carbide and the other side is made of cemented carbide. The super-finishing wheel holder according to (1), wherein a square hole for accommodating the wheel is formed.
(3) A square hole for accommodating a super-finishing grindstone is provided in the super-abrasive grain sintered body approximately perpendicular to the joining direction of the super-abrasive sintered body and the cemented carbide, and (1) The super-finishing wheel holder according to (1), wherein the content of the super-abrasive grains in the consolidated body is 35 to 90% by volume, (4) the content of the super-abrasive grains is 35 to 90% by volume.
(1) and (2), wherein after joining the superabrasive sintered body and the cemented carbide, the square hole for accommodating the superfinishing stone is machined by electric discharge machining or wire electric discharge machining. Item or (3), the method for manufacturing a super-finished grinding wheel holder, and (5) after machining a square hole for accommodating the super-finished grinding wheel by electric discharge machining or wire electric discharge machining, and further by grinding or polishing. (4) The method for manufacturing a super-finished grinding wheel holder according to the above (4) for finishing the surface of the abrasive grain sintered body.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of one embodiment of a super-finishing wheel holder of the present invention. FIG. 1 (a) shows a main body, and FIG.
Represents a lid. The main body is composed of a super-abrasive sintered body 1, a super-abrasive sintered body base material 2 and a cemented carbide 3, and is provided with a square groove 4 which becomes a square hole for accommodating a super-finished grindstone when the lid is overlaid. ing. The lid is made of a superabrasive sintered body 5 and a cemented carbide 6. FIG. 2 is a perspective view showing a state where the superfinishing stone holder of FIG. 1 is assembled. The super-finishing grindstone 7 is accommodated in the square groove formed by accommodating the superfinishing grindstone 7 in the square groove of the main body and the lid or by overlapping the lid on the main body.
The state shown in FIG. The square hole formed by the square groove and the lid provided in the main body is slightly larger than the super-finishing wheel, and there is a slight gap between the super-finishing wheel and the inner wall of the square hole. It can be moved back and forth in the length direction. The super-abrasive sintered body 1 of the main body and the super-abrasive sintered body 5 of the lid are overlapped and assembled so as to be in contact with each other, and the side having the super-abrasive sintered body of the assembled super-finishing wheel holder is in a state with respect to the work material. Used for super finishing. In super-finishing, the super-finishing wheel vibrates in its length direction and receives a force in a direction perpendicular to the length direction by contact with the work material at an end in contact with the work material. It is mainly supported by the inner wall of the square hole on the side of the superfinishing wheel holder facing the workpiece.
Since the inner wall of the square hole on the side with respect to the workpiece is made of a super-abrasive sintered body,
The inner wall of the square hole on the side of the work piece of the super-finishing wheel holder that is less likely to be worn makes it possible to perform high-precision super-finishing processing and prolong the life of the super-finishing wheel holder.

FIG. 3 is an explanatory view of a method of manufacturing the main body of the superfinishing wheel holder of FIG. Superabrasive grains are sintered on the superabrasive sintered body base material 2, and a material having the shape shown in FIG. As superabrasive grains, diamond abrasive grains or cubic boron nitride abrasive grains can be used. As the binder, for example, metal powders such as cobalt and nickel, and ceramic powders such as alumina and silicon carbide can be used.
As a superabrasive sintered body base material, for example, tungsten carbide,
Ceramic or the like can be used. In the present invention, the content of superabrasive grains in the superabrasive sintered body is 35 to 90% by volume.
And more preferably 50 to 60% by volume. When the content of superabrasive grains in the superabrasive sintered body is less than 35% by volume,
The wear resistance of the superabrasive sintered body is insufficient, the inner wall of the square hole on the side of the square hole of the superfinishing wheel holder against the work material is quickly worn, the precision of superfinishing processing is reduced, and the superfinishing wheel holder May have a shorter lifespan. If the content of the superabrasive grains in the superabrasive sintered body exceeds 90% by volume, the mechanical strength of the superabrasive sintered body may increase, and processing may be difficult.
On the other hand, from the cemented carbide, the shape shown in FIG.
By joining the super-abrasive-grain sintered materials shown in (1) and (2), a rectangular parallelepiped material is cut out. The cemented carbide used is not particularly limited, and examples thereof include tungsten carbide, titanium carbide, tantalum carbide, alloys thereof, and alloys containing cobalt. By joining the superabrasive sintered material having the shape shown in FIG. 3A and the cemented carbide material having the shape shown in FIG. 3B, the superabrasive having the rectangular parallelepiped shape shown in FIG. It can be used as a raw material for a finishing whetstone holder. There is no particular limitation on the method of joining the superabrasive sintered material and the cemented carbide material. For example, they can be joined by brazing, bonding with an adhesive, or the like. The raw material of the super-finishing wheel holder having the shape shown in FIG. 3 (c) is then subjected to electric discharge machining to form a square groove to obtain a main body of the super-finishing wheel holder having the shape shown in FIG. 1 (a). The square groove can be easily machined by wire electric discharge machining. In the present invention, since the content of superabrasive grains in the superabrasive sintered body is 90% by volume or less, the superabrasive sintered body having the shape shown in FIG. Material can be easily machined by electric discharge machining.

FIG. 4 is an explanatory view of a method of manufacturing the lid of the superfinishing wheel holder of FIG. Fig. 4
A material having the shape shown in FIG. As superabrasive grains, diamond abrasive grains or cubic boron nitride abrasive grains can be used. As the binder, for example, metal powders such as cobalt and nickel, and ceramic powders such as alumina and silicon carbide can be used. In the lid, since the superabrasive sintered body material and the cemented carbide are integrated and no electric discharge machining is performed, if the content of the superabrasive grains in the superabrasive sintered body is 35% by volume or more, It can be arbitrarily selected. If the content of the superabrasive grains in the superabrasive sintered body is less than 35% by volume, the wear resistance of the superabrasive sintered body is insufficient, and the side of the square hole of the superfinishing wheel holder with respect to the workpiece is not provided. The inner wall of the square hole wears quickly, the precision of the superfinishing is reduced, and the life of the superfinishing wheel holder may be shortened. on the other hand,
A rectangular parallelepiped material is cut out of the cemented carbide by joining the superabrasive sintered material shown in FIG. 4A and having the shape shown in FIG. 4B. The cemented carbide used is not particularly limited, and examples thereof include tungsten carbide, titanium carbide, tantalum carbide, alloys thereof, and alloys containing cobalt. By joining the superabrasive grain sintered body material having the shape shown in FIG. 4A and the cemented carbide material having the shape shown in FIG. 4B, the superabrasive having the rectangular parallelepiped shape shown in FIG. It can be used as a lid for the finishing whetstone holder.
There is no particular limitation on the method of joining the superabrasive sintered material and the cemented carbide material. For example, they can be joined by brazing, bonding with an adhesive, or the like.

FIG. 5 (a) is a plan view of another embodiment of the superfinishing wheel holder of the present invention, and FIG. 5 (b) is a sectional view taken along line AA of FIG. 5 (a). FIG. 5 (c) is a cross-sectional view showing a state in which the superfinishing stone is housed in FIG. 5 (b). In the super-finishing wheel holder of the present embodiment, the square hole 8 for accommodating the super-finishing wheel is perpendicular to the joining direction of the super-abrasive sintered body 10 and the cemented carbide 9, and Is provided.
The superabrasive sintered body is joined to the cemented carbide through a superabrasive sintered body base material 11. Superfinishing wheel 12 is housed in a square hole provided in the superabrasive sintered body. The square hole provided in the superabrasive grain part is slightly larger than the superfinishing wheel, and there is a slight gap between the superfinishing wheel and the inner wall of the square hole. It is possible to reciprocate in the direction. In super-finishing, the super-finishing wheel vibrates in its length direction and receives a force in a direction perpendicular to the length direction by contact with the work material at an end in contact with the work material. It is supported by the inner wall of the square hole of the super-finishing wheel holder. The super-finishing wheel holder of this embodiment has a square hole for accommodating the super-finishing wheel, which is made of a super-abrasive sintered body. The life of the holder is extended.

FIG. 6 is an explanatory diagram of a method of manufacturing the super-finishing wheel holder of FIG. From the material obtained by sintering the superabrasive grains on the superabrasive sintered body base material 11 to form the superabrasive sintered body 10,
A material having the shape shown in FIG. 6A is cut out. As superabrasive grains, diamond abrasive grains or cubic boron nitride abrasive grains can be used. As the binder, for example, metal powders such as cobalt and nickel, and ceramic powders such as alumina and silicon carbide can be used.
As a superabrasive sintered body base material, for example, tungsten carbide,
Ceramic or the like can be used. In the present invention, the content of superabrasive grains in the superabrasive sintered body is 35 to 90% by volume.
And more preferably 50 to 60% by volume. When the content of superabrasive grains in the superabrasive sintered body is less than 35% by volume,
The wear resistance of the superabrasive sintered body is insufficient, the square holes of the superfinishing wheel holder are rapidly worn, the precision of the superfinishing process is reduced, and the life of the superfinishing wheel holder may be shortened. If the content of the superabrasive grains in the superabrasive sintered body exceeds 90% by volume, the mechanical strength of the superabrasive sintered body may increase, and processing may be difficult. On the other hand, FIG.
A material having the shape shown in the figure is cut out. The cemented carbide used is not particularly limited, and examples thereof include tungsten carbide, titanium carbide, tantalum carbide, alloys thereof, and alloys containing cobalt. By joining a superabrasive sintered material having a shape shown in FIG. 6A and a cemented carbide material having a shape shown in FIG. 6B, a superfinishing wheel having a shape shown in FIG. It can be a raw material for the holder. There is no particular limitation on the method of joining the superabrasive sintered material and the cemented carbide material. For example, they can be joined by brazing, bonding with an adhesive, or the like. The raw material of the superfinishing wheel holder having the shape shown in FIG. 6C is then processed by electric discharge machining to obtain a superfinishing wheel holder having the shape shown in FIG. The super-finishing grindstone holder of this embodiment can be easily manufactured because only part of the holder is subjected to die sinking electrical discharge machining and most of the holder can be machined by wire electrical discharge machining. In the present invention, since the superabrasive grain content of the superabrasive sintered body is 90% by volume or less, the superabrasive sintered body having the shape shown in FIG. Material can be easily machined by electric discharge machining.

FIG. 7 (a) is a perspective view of another embodiment of the superfinishing wheel holder of the present invention. The super-finishing grindstone holder of the present embodiment is made of a material having a super abrasive grain sintered body 10 formed in a cylindrical super abrasive grain sintered body base material 11 and having a shape shown in FIG. And a square hole 8 is formed by electric discharge machining. In the superfinishing wheel holder of this embodiment, a square hole 8 for accommodating the superfinishing wheel is provided perpendicular to the joining direction of the cylindrical superabrasive sintered body 10 and the cemented carbide 9.
The superabrasive sintered body is joined to the cemented carbide through a superabrasive sintered body base material 11. The superfinishing stone is housed in a square hole provided in a cylindrical superabrasive sintered body. The square hole provided in the superabrasive grain part is slightly larger than the superfinishing wheel, and there is a slight gap between the superfinishing wheel and the inner wall of the square hole. It is possible to reciprocate in the direction. In super-finishing, the super-finishing wheel vibrates in its length direction and receives a force in a direction perpendicular to the length direction by contact with the work material at an end in contact with the work material. It is supported by the inner wall of the square hole of the super-finishing wheel holder. The super-finishing wheel holder of this embodiment has a square hole for accommodating the super-finishing wheel, which is made of a super-abrasive sintered body. The life of the holder is extended. The super-finishing wheel holder of the present invention is manufactured by electric discharge machining after joining a super-abrasive grain sintered body constituting a portion for accommodating the super-finishing wheel and a cemented carbide mainly serving as a body portion. Compared with the conventional super-finished grinding wheel holder, which has a super-abrasive sintered flake attached to the wall, not only does the machining accuracy improve significantly,
The machining is much easier, the machining time is shortened, the production cost is reduced due to the improved yield, and the machining of holders with complex shapes is possible. The superfinishing wheel holder of the present invention can be suitably used, for example, as a superfinishing wheel holder for superfinishing the inner peripheral surface of a bearing.

[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 A 5.0 mm-thick diamond grinder using a nickel-based binder having a content of diamond grits of 60% by volume as a binder on a superabrasive grain sintered compact base material of 4.0 mm-thick tungsten carbide. Using a material having a granular sintered body, a super-finished grindstone holder having the shape shown in FIG. 1 was produced. FIG. 3 cut out from a diamond abrasive sintered body to approximately 4W × 15L × 12T
A material having a shape shown in FIG. 3A and a tungsten carbide material having a shape shown in FIG.
A raw material for a 15 mm × 19 mm super-finished grindstone holder body was prepared. The width of the raw material is 2.
Two 5 mm square grooves having a depth of 3.0 mm were machined to obtain a superfinished grindstone holder body having the shape shown in FIG. FIG. 4 of 5 mm × 15 mm × 1.5 mm cut out from a diamond abrasive grain sintered body having a diamond abrasive content of 90% by volume.
The material having the shape shown in FIG. 1A and the tungsten carbide material having the shape shown in FIG.
A lid of a 19 mm × 4.5 mm super-finishing wheel holder was prepared. The superabrasive grain sintered body of the main body of the superfinishing wheel holder and the superabrasive grain sintered body of the lid are overlapped so that they are in contact with each other, and the side having the superabrasive grain sintered body of the assembled superfinishing wheel holder is machined. The workpiece was mounted on a jig of a processing apparatus, and two super-finishing grindstones having a cross section of 2.5 mm × 3.0 mm were housed in a square hole to perform super-finishing of the inner ring of the rolling bearing. Even after 253 days have passed since the start of processing, super finishing has been continued without causing any performance problems. Example 2 A 5.0-mm-thick diamond grinder using a nickel-based binder having a content of diamond grits of 60% by volume as a binder on a superabrasive-grain sintered compact base material of 4.0-mm-thick tungsten carbide. Using a material having a granular sintered body, a superfinishing wheel holder having a shape shown in FIG. 5 was produced. The material shown in FIG. 6A cut out from the diamond abrasive sintered body into 5 W × 10 L × 10 T and the tungsten carbide material shown in FIG. 5mm x 10mm x 6
Raw materials for a 0 mm super-finished whetstone holder body were produced.
This raw material is machined by wire electric discharge machining and die sinking electric discharge machining to obtain a super-finishing wheel holder having a square hole for accommodating a super-finishing wheel having a cross section of 1.2 mm × 1.5 mm and having a shape shown in FIG. Was. A super-finished grindstone having a cross section of 1.2 mm × 1.5 mm was accommodated in the square hole of the super-finished grindstone holder, and superfinishing of the outer ring of the rolling bearing was performed. 25 after starting machining
Even after three days, superfinishing continues without any performance problems.

[0012]

The super-finishing wheel holder of the present invention is manufactured by electric discharge machining after joining a super-abrasive sintered body constituting a portion for accommodating a super-finishing wheel and a cemented carbide mainly serving as a body portion. In addition, the machining accuracy is remarkably excellent, the machining is easy, the machining time is shortened, the yield is improved, the production cost is reduced, and the machining of a holder having a complicated shape becomes possible.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of a superfinishing wheel holder of the present invention.

FIG. 2 is a perspective view showing a state where the superfinishing wheel holder of FIG. 1 is assembled.

FIG. 3 is an explanatory diagram of a method of manufacturing the main body of the superfinishing wheel holder of FIG. 1;

FIG. 4 is an explanatory view of a method of manufacturing the lid of the superfinishing wheel holder of FIG. 1;

FIG. 5 is a plan view and a sectional view of another embodiment of the superfinishing wheel holder of the present invention.

FIG. 6 is an explanatory diagram of a method of manufacturing the superfinishing wheel holder of FIG. 5;

FIG. 7 is a perspective view of another embodiment of the superfinishing wheel holder of the present invention.

[Explanation of symbols]

 Reference Signs List 1 super-abrasive sintered body 2 super-abrasive sintered body base material 3 super-hard alloy 4 square groove 5 super-abrasive sintered body 6 super-hard alloy 7 super-finishing wheel 8 square hole 9 super-hard alloy 10 super-abrasive sintering Bonding 11 Super abrasive grain sintered body base material 12 Super finishing whetstone

Claims (5)

(57) [Claims] 1. A superabrasive sintered body and a cemented carbide are joined together,
A super-abrasive grinding stone holder having a square hole for accommodating a super-finishing stone, wherein at least the inner wall of the square hole on the side of the work material has a super-abrasive grain content of 35 to 90% by volume. A super-finishing whetstone holder characterized by comprising: 2. A square groove for accommodating a super-finishing grindstone from one end to a work material to another end, and the inner wall of the square groove on the work material side has a superabrasive grain content of 35%. ９０90% by volume of a super-abrasive sintered body, the inner wall of the square groove on the other side is made of a cemented carbide, the main body is made of a super-abrasive sintered body, and the other side is made of a super-abrasive sintered body. The super-finishing wheel holder according to claim 1, wherein a square hole for accommodating the super-finishing wheel is formed by stacking a lid made of a hard alloy. 3. A super-abrasive grain sintered body portion is provided with a square hole for accommodating a super-finishing whetstone, substantially perpendicular to a joining direction of the super-abrasive sintered body and the cemented carbide. The superfinished grinding wheel holder according to claim 1, wherein the content of the superabrasive grains in the grain sintered body is 35 to 90% by volume. 4. After joining a superabrasive grain sintered body having a superabrasive grain content of 35 to 90% by volume and a cemented carbide, a square hole for accommodating a superfinishing stone is subjected to electric discharge machining or wire electric discharge machining. The method for producing a super-finishing wheel holder according to claim 1, wherein the workpiece is machined. 5. The super-finished grinding wheel holder according to claim 4, wherein a square hole for accommodating the super-finished grinding wheel is machined by electric discharge machining or wire electric discharge machining, and then the surface of the super-abrasive sintered body is finished by grinding or polishing. Manufacturing method.