JP2981427B2 - Diamond point dresser and dressing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a diamond point dresser and a dressing method, and more particularly, to a technique for obtaining durability and high dressing performance.

[0002]

2. Description of the Related Art A single-stone diamond dresser in which one diamond is buried at the tip and the grinding wheel is dressed, that is, dressed and reshaped by pressing the tip against the grinding surface of a rotating grinding wheel. It has been known. Such single-stone diamond dressers, according to the shape of the buried diamond,
Point dressers such as a conical dresser processed into a conical shape, an R-shaped conical dresser whose tip end is formed into a curved surface, and a pyramid dresser processed into a pyramid shape, and a single buried raw stone that is left unprocessed Classified as stone dressers. Of these, a single stone dresser is difficult to embed diamond such that its tip is located on the axis of the main body and is symmetric with respect to the axis because of the unevenness of the shape of the ore. It cannot be used for high-precision dressing. Therefore, in general, a point dresser obtained by processing diamond into a predetermined shape is used for precision grinding.

[0003]

Among the above point dressers, a pyramid dresser is used when a high sharpness is required because a sharp edge is formed on a pyramid surface. However, there is a problem that the service life is short since the service life is limited until the sharp edge of the conical surface is worn and the sharpness is reduced. In addition, the pyramid shape is difficult to be embedded or processed after embedding so that the tip (apex) is located on the axis of the main body. Therefore, it is difficult to obtain high shape accuracy of the ground surface. In addition, there is a problem that the tip is sharp and easily chipped. Further, when using a point dresser, a predetermined dressing is performed on the grinding surface so that the tip of the dresser is directed in the rotation direction of the grinding wheel in order to perform uniform dressing by suppressing excessive penetration of diamond into the grinding surface. Is pressed against the ground surface in an inclined state forming a dress angle. Therefore, at the beginning of use of the dresser, diamond breakage due to biting into the grinding surface is suppressed, but as a result of being obliquely pressed against the grinding surface, the tip is further sharply deformed, so that the tip is damaged. There is also the problem that the possibility increases gradually.

[0004] On the other hand, the conical dresser can easily match the axial direction with the axial direction of the main body, so that a high shape precision of the ground surface can be obtained. There is a problem that the tip is easily broken. In general, as the dressing point pressed against the grinding surface wears, the conical dresser is rotated by a predetermined angle around the axis of the main body to change the dressing point to a non-wearing portion, so that a number of points can be used. ], The tip is further sharpened, and the defect is more likely to occur. In addition, the change of the dressing point is made for the purpose of extending the service life by using the entire circumference of the cone evenly, but the dressing point of the conical dresser has a small area near the tip of the conical surface. Because part
The number of changes that can be made is small, and the durability cannot be improved so much even by using a large number of points. Further, the conical dresser is also used for dressing, for example, a grinding wheel for precision machining for orbital grinding of a small diameter bearing inner ring. For example, in an inner ring manufacturing apparatus that is configured as an automatic machine having a grinding wheel and a dresser and is operated unattended, a number of inner rings are polished while the dressing of the grinding wheel is sequentially performed, and the dresser replacement is also performed automatically. However, in such a manufacturing apparatus, assuming that the shape of the dresser and thus the shape of the ground surface are kept constant, a large number of inner rings are manufactured continuously without confirming them. Therefore, if the tip position of the dresser is not constant, the grinding surface is extended and the shape accuracy of the inner ring to be processed by the dressing is reduced, so that in such an application, the damage of the dresser (tip loss) is further increased. It is a big problem.

According to the above-mentioned conical dresser with R, the tip shape is kept constant because the above-mentioned tip loss is unlikely to occur. However, since the dressing point is a curved surface, high dressing performance is obtained. There is a problem that can not be. Moreover, since the conventional point dressers as described above are pressed against the ground surface over a wide area including the tip, there is also a problem that the ground surface becomes excessively smooth and the grinding performance of the grinding wheel is reduced. .

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a diamond point dresser and a dressing method capable of obtaining both durability and high dressing performance. is there.

[0007]

In order to achieve the above object, a gist of a diamond point dresser according to the first invention is that a diamond is buried in a tip portion and is rotated around an axis. Dressing of the grinding wheel by pressing the diamond against the grinding surface with the axis of the main body inclined at a predetermined angle with respect to the grinding surface so that the tip of the grinding wheel is directed in the direction of rotation of the grinding surface of the grinding wheel (A) wherein the diamond is formed in a truncated cone shape whose axis is positioned substantially coaxially with the axis of the main body.

[0008]

According to the first aspect of the present invention, the diamond point dresser is formed by forming a diamond into a truncated cone shape whose axis is positioned substantially coaxially with the axis of the main body. Therefore, when the tip is pressed against the grinding surface in a state where the axial direction of the main body is inclined with respect to the grinding surface, the tip formed between the tip surface and the conical surface of the truncated conical diamond is formed. Although the dressing of the ground surface is performed by the edge portion of the peripheral portion of the surface, the edge portion forms an obtuse angle, so that it is unlikely that a defect occurs. In addition, since the ground surface is brought into line contact only with the edge portion, the contact area is reduced and high dressing performance is obtained. Furthermore, since the dressing point is formed on the peripheral edge of the truncated cone-shaped diamond tip surface, the main body rotates around the axis in comparison with the conventional conical dresser where the dressing point is located near the sharp tip. By doing so, the number of dressing points that can be sequentially changed and used increases, and a long life can be obtained. Therefore, a diamond point dresser having both durability and high dressing performance can be obtained.

[0009]

The gist of the dressing method of the second invention for achieving the above object is to use the diamond point dresser of the first invention to change the grinding surface of a grinding wheel. A dressing method for dressing, (a) the diamond point dresser, in a state where the axial direction is inclined at a predetermined angle with respect to the grinding surface so that the tip portion is directed to the rotation direction of the grinding wheel, A dressing step of dressing while pressing against the ground surface at a predetermined dressing point at a predetermined dressing point in the peripheral edge of the truncated cone diamond; and (b) rotating the diamond point dresser around the axis of the main body. A dressing point changing step of changing the dressing point pressed against the ground surface. That.

[0010]

According to the second aspect of the present invention, the diamond point dresser is formed in a truncated cone shape with the axial direction of the main body inclined with respect to the grinding surface so that the tip portion is directed to the rotating direction of the grinding wheel. A dressing step of dressing while pressing against the ground surface at a predetermined dressing point of the peripheral edge of the diamond tip surface, and rotating the diamond point dresser around the axis of the main body to press the ground surface. Dressing point changing step of changing the dressing point to be performed. For this reason, dressing of the ground surface is performed by the peripheral edge corners of the truncated conical diamond formed between the distal end surface and the conical surface of the diamond, but the edge portion is obtusely angled and thus is missing. Is hard to occur, and since the ground surface is brought into line contact only with the edge portion, the contact area is small, so that high dressing performance can be obtained. In the dressing point changing step, the diamond point dresser is rotated, so that the dressing points are sequentially changed in a long range along the peripheral portion of the truncated cone-shaped diamond tip surface, so that it is stable at many dressing points. As a result, a long service life can be obtained. Therefore, both durability and high dressing performance can be obtained.

[0011]

In another embodiment of the present invention, the diamond preferably has a cone angle (an angle formed by a pair of hypotenuses forming a conical surface in a cross section passing through the axis) of about 30 to 150 degrees. Is formed in a truncated cone shape of about 100 to 120 degrees, most preferably about 110 degrees. By doing so, the peripheral edge of the diamond is sufficiently obtuse at the corner where the high dressing performance can be obtained, so that higher durability and dressing performance can be obtained.

Preferably, the diamond is
It is formed in a truncated cone shape with a diameter of the tip surface of about 0.15 to 2 (mm). With this configuration, since the tip surface of the truncated cone-shaped diamond is sufficiently large, the tip is less likely to be chipped, and higher durability can be obtained.
If the diameter of the tip surface is excessively large, the contact area becomes large and the ground surface becomes too smooth, so that the dressing performance is impaired and the sharpness of the grindstone deteriorates. It is preferred.

Preferably, in the above-mentioned dressing method, the dressing point changing step rotates the dresser by a predetermined angle of about 15 to 40 degrees around the axis. In this manner, a large number of dressing points of several to twenty and several places are sequentially used, so that a single dresser enables long-time dressing under more stable conditions.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the following description,
The dimensional ratios and the like of each part are not necessarily drawn accurately.

FIG. 1 is a diagram showing a diamond point dresser (hereinafter, simply referred to as a dresser) 10 according to an embodiment of the present invention. FIG. 1 (a) is a perspective view showing the whole, and FIG.
FIG. 4 is an enlarged view of the distal end viewed from the distal end side in the axial direction, and FIG. 4C is a view corresponding to the right side view of FIG. In the figure, dresser 1
Reference numeral 0 denotes, for example, a diamond 14 having a large aspect ratio called a long diamond having a large aspect ratio of about 1/32 to 3 (ct), which is formed of, for example, steel, is formed at the tip of the main body 12 having a substantially cylindrical shape. It is embedded and configured.

The main body 12 has a columnar shank portion 16 which is formed in a columnar shape and is gripped by a holder of a dressing device (not shown), and has a large diameter following the shank portion 16 and has a diamond 14 embedded therein. And an embedding section 18 to be formed. The embedding portion 18 includes a conical surface 20 whose diameter is located on the axis of the shank portion 16, the diameter of which decreases toward the distal end at a position opposite to the shank portion 16.

The diamond 14 is fixed to the tip of the conical surface 20 by sintering, brazing, or caulking, as shown in FIG. 1 (c). And a flat surface 24 having a tip portion perpendicular to the axial direction C. That is, the tip of the dresser 10 is
2 and a flat surface 24 provided at the tip of the conical surfaces 20 and 22 formed by the surfaces of the diamond 14 and the diamond 14.
Is formed in the shape of a truncated cone with the axis C positioned on the axis of the main body 12 (the shank 16). Therefore, the edge portion 30 which is the boundary between the conical surface 22 and the flat surface 24 has an obtuse angle. This frustoconical shape is
Cone angle theta _c of 0,22 is, for example, is about 30 to 150 degrees, the flat surface 24 of the tip, for example, diameter 0.15 to 2 (mm)
It is about circular. Therefore, the size theta _e dihedral angle between the angles, or the conical surface 22 and the flat surface 24 of the edge portion 30 is a _{(π + θ c) / 2} = 105 ~165 degrees. After the diamonds 14 are fixed to the main body 12, the conical surfaces 20, 22 and the flat surface 24 are integrated with the conical surfaces 20, 22 by, for example, polishing such as lapping, so that the axis C is The shank portion 16 is formed so as to be smooth so as to coincide with the axis of the shank portion 16, and further, the front end portion is formed so as to be perpendicular and smooth to the axis C thereof. In this embodiment, the flat surface 24 corresponds to the tip surface.

The dresser 10 configured as described above has:
For example, as shown in FIG. 2, the tip is pressed against the grinding surface 28 of the grinding wheel 26 rotated in the direction of the arrow A in the direction of the arrow B along the axial direction C,
It is used while being reciprocated in a direction parallel to the axis of the grinding wheel 26 perpendicular to the paper surface (that is, the thickness direction of the grinding wheel 26). In the drawings, the flat surface 24 is shown in an enlarged manner for convenience of explanation.

At this time, the dresser 10 is tilted rearward in the rotational direction by a predetermined dress angle φ of about 15 to 40 degrees with respect to the normal direction H of the grinding surface 28 with respect to the axis direction C. That is, the shank portion 12 is fixed to a holder of a dressing device (not shown) at a predetermined rotation position around the axis C so that the tip portion is directed in the rotation direction. Therefore, of the tip of the dresser 10, the conical surface 2
A part of the edge 30 of the peripheral edge of the flat surface 24 (that is, the corner of the peripheral edge of the flat surface) formed between the flat surface 2 and the flat surface 24 is pressed against the ground surface 28, and the diamond 14 is brought into line contact at the edge 30. In this state, the ground surface 28 is dressed. Therefore, dresser 1
0 and with high dressing performance because the contact area is small between the grinding surface 28 is obtained, since the edge portion 30 for performing dressing is a theta _e = 105 to 165 degrees of obtuse, the edge portion 30 It is unlikely that they will be sharpened and even damaged during dressing. That is, in the present embodiment, as shown in FIG. 2, the step of pressing the dresser 10 in the B direction against the grinding surface 28 of the grinding wheel 26 rotated in the A direction corresponds to the dressing step. Strictly speaking, the dressing of the grindstone 26 is performed at the grinding surface 2 of the edge portion 30.
This is done by a dressing point 32, which is part of the above, which is brought into contact with 8.

When the dressing point 32 pressed against the grinding surface 28 is worn by a predetermined amount by repeatedly dressing the grinding wheel 26 as described above, for example, the fixing of the shank portion 12 is loosened and the dresser 10 is removed. For example, it is re-fixed at a rotational position rotated by a predetermined angle of about 15 to 40 degrees in the direction of arrow D in the figure, and further dressing is performed using different dressing points 32. The rotation angle of the dresser 10 is changed to 360 while repeatedly changing the dressing point 32 by a predetermined amount by rotating the dresser 10 every predetermined angle.
The dresser 10 is continuously used until the entire circumference of the edge portion 30 is used for dressing. Thereby, since the plurality of dressing points 32 on the edge portion 30 formed on the peripheral portion of the flat surface 24 are sequentially used, high dressing performance is maintained for a long time. The change of the dressing point 32 is performed, for example, after confirming that the wear amount is about 1/5 to 4/5 of the diameter of the flat portion 24.
8 is determined according to the required accuracy and the like. In the present embodiment, the step of rotating the dresser 10 in the direction D about the axis C at every predetermined angle corresponds to a dressing point changing step.

FIG. 3 is a view showing the state of wear of the tip of the dresser 10 used as described above.
(b) is a diagram corresponding to (b) and (c) of FIG. 1, respectively. In FIG. 3A, a plurality of wear surfaces 34 are formed on the entire peripheral edge of the flat portion 24 so as to extend in the radial direction. As shown in FIG.
Is pressed against the grinding surface 28 at an angle, so that the wear surface 34 has the diamond 1 as shown in FIG.
Than the cone angle theta _c of 4 conical surfaces 22 are formed so as to form a large angle with respect to the axial direction C. FIG. 3 shows a state after use when the rotation angle of the dresser 10 around the axis is 30 degrees, for example.
4 are formed at a total of 12 locations every 30 degrees along the peripheral edge of the flat portion 24.

In short, in the present embodiment, the dresser 10 is formed by forming the diamond 14 into a truncated cone shape in which the axis is located on the axis C of the main body 12. Therefore, when the diamond 14 at the tip is pressed against the grinding surface 28 in a state where the axial direction of the main body 12 is inclined with respect to the grinding surface 28, the flat surface 24 and the conical surface 22 of the truncated conical diamond 14 are formed. The grinding surface 2 is formed by the edge portion 30 of the peripheral portion of the flat surface 24 formed between
Although the possible 8 dressing is made, the edge portion 30 is hard to occur defective from the fact that an obtuse angle of about θ _e = 105 ~165 °. Moreover, since the grinding surface 28 is brought into line contact only with the edge portion 30,
The contact area is reduced, so that high dressing performance can be obtained. In addition, dressing point 32
Is formed on the edge portion (peripheral portion) 30 of the flat surface 24 which is the tip surface of the diamond 14 having a truncated cone shape.
Compared with the conventional conical dresser in which the dressing point 32 is located near the sharp tip, the number of the dressing points 32 that can be changed and used sequentially by rotating the main body 12 around the axis C increases, A long life can be obtained. Therefore, a dresser 10 having both durability and high dressing performance can be obtained.

In the present embodiment, the dresser 10
The flat surface of the truncated cone-shaped diamond 14 in a state where the axial direction C of the main body portion 12 is inclined at a predetermined dress angle φ with respect to the grinding surface 28 so that the tip portion is directed to the rotation direction A of the grinding wheel 26. The dressing step of dressing while pressing against the grinding surface 28 at a predetermined dressing point 32 of the edge portion 30 of the 24 peripheral edge, and rotating the dresser 10 around the axis C of the main body portion 12 And a dressing point changing step of changing the dressing point 32 to be pressed. For this reason, dressing of the grinding surface 28 is performed by the edge portion 30 formed between the flat surface 24 and the conical surface 22 at the tip of the truncated conical diamond 14, but the edge portion 30 forms an obtuse angle. As a result, chipping hardly occurs, and the grinding surface 28 is brought into line contact only with the edge portion 30. Therefore, since the contact area is small, high dressing performance can be obtained. Then, in the dressing point changing step, the dresser 10 is rotated, so that the dressing point 32 is sequentially changed in a long range along the peripheral edge 30 of the flat surface 24 at the tip of the truncated conical diamond 24. Since stable dressing is performed at many dressing points 32, a long life can be obtained. Therefore, both durability and high dressing performance can be obtained.

Further, in the present embodiment, the diamond 14, the cone angle theta _c is formed in a truncated cone shape of about 30 to 150 degrees. Therefore, the edge portion 30 is sufficiently obtuse as long as high dressing performance can be obtained, so that higher durability and dressing performance can be obtained. Incidentally, when the cone angle theta _c becomes too large, the angle of the edge portion _{30 θ e (= [π +} θ c] / 2) since it will not bite almost on the grinding surface 28 is too large, sufficient sharpness That dressing performance You won't get it.

In the present embodiment, the diamond 14 is formed in a truncated cone shape having a diameter of the flat surface 24 at the tip of about 0.15 to 2 (mm). For this reason, the flat surface 24 at the tip of the diamond 14 having a truncated conical shape is made sufficiently large, so that the tip of the diamond 14 is less likely to be damaged, and higher durability can be obtained. If the diameter of the flat surface 24 is excessively large, the contact area becomes too large and the grinding surface 28 becomes too smooth, so that the dressing performance is impaired and the sharpness of the grinding wheel 26 becomes poor. It is preferred that this be done.

In the present embodiment, the dressing point changing step is to rotate the dresser 10 about the axis C by a predetermined angle of about 15 to 40 degrees. In this manner, a large number of dressing points 32 at several places to twenty and several places are sequentially used, so that one dresser 10 enables long-time dressing under more stable conditions.

While the embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be embodied in still another embodiment.

For example, in the above-described embodiment, the main body portion 12 has the cylindrical shank portion 16 and the buried portion 18 formed with a larger diameter than the shank portion 16, but these shapes may be appropriately changed. . For example, the shank portion 16 may have a tapered shape or a stepped shape, and the shape is appropriately set according to the shape of the holder of the dressing device. Also,
The embedding part 18 may be formed in various polygonal shapes or the like, and the tip part on the opposite side to the shank part 16 may have a truncated cone shape.

In the embodiment, the diamond 1
For 4, a natural product was used, but a synthetic single crystal may be used. In addition, the shape is a prismatic column, a columnar polygonal cross section, or a columnar shape is used,
After being embedded in the main body 12, it may be polished into a shape as shown in FIG. Dresser 10 is generally
After the diamond 14 has been worn by a predetermined amount, it is replaced and processed into a predetermined shape, so that the main body 12 is used repeatedly. When a columnar diamond is used, the frequency of the replacement can be reduced.

The size of the shank portion 16 and the size of the diamond 14 are appropriately changed according to dressing conditions and the like.

In the embodiment, the diamond 1
The cone angle theta _c of about 30 to 150 degrees 4, the diameter of the flat surface 24 has been set to the extent 0.15 to 2 (mm), these values, the dressing performance required for each application (e.g. It is appropriately changed according to the sharpness, precision, etc.) and durability.

In the embodiment, the wear amount of the dressing point 32 is confirmed, and the dresser 10 is moved to the axis C.
Although it was rotated around, for example, dressing time until reaching a predetermined amount of wear is measured in advance and every predetermined time,
Alternatively, the dressing resistance may be measured and rotated by a predetermined angle each time it is detected that the dressing resistance has increased to a predetermined value. In these cases, the dressing point 32 is automatically changed by providing the dressing device with a timer, a dressing resistance detecting device, and the like, and an automatic rotating device for rotating the dresser 10 about the axis C. May be configured. In this way, the dressing point 32 is changed under more uniform conditions, so that the dressing performance is further stabilized. In these cases, the dresser 10 is rotated by a predetermined angle every predetermined time or each time the dressing resistance increases to a predetermined value.

In the embodiment, the dresser 10 is rotated at a predetermined angle around the axis C every time the amount of wear at the dressing point 32 becomes a predetermined amount, that is, at a predetermined time. The dresser 10 may be continuously rotated around its axis C during the execution of the process.
Even in this case, since a large number of dressing points 32 are used evenly, high durability and high dressing performance can be obtained.

Although not specifically exemplified, the present invention can be variously modified without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1A is a perspective view showing a dresser according to an embodiment of the present invention, FIG. 1B is an enlarged view showing a tip portion viewed from an axial direction, and FIG. It is a figure corresponding to the right view in (b).

FIG. 2 is a diagram schematically showing a use state of the dresser of FIG. 1;

FIG. 3 is a diagram showing the tip of the dresser after use,
(a) and (b) are diagrams corresponding to FIGS. 1 (b) and (c), respectively.

[Explanation of symbols]

 10: Diamond point dresser 12: Main body 14: Diamond 24: Flat surface (tip surface) 26: Grinding wheel 28: Grinding surface 30: Edge portion (tip surface peripheral edge corner) 32: Dressing point

Continuation of the front page (56) References JP-A-63-312064 (JP, A) JP-A-6-55442 (JP, A) JP-B-39-13900 (JP, B1) JP-B-46-42282 (JP-A) , B1) (58) Field surveyed (Int. Cl. ⁶ , DB name) B24B 53/12 B24B 53/047

Claims (2)

(57) [Claims] A diamond is buried in a tip portion, and an axis direction of a main body portion with respect to the grinding surface is oriented so that the tip portion is directed in a rotation direction of a grinding surface of a grinding wheel rotated around an axis. A diamond point dresser of a type in which the diamond is pressed against the grinding surface in a state of being inclined at a predetermined angle to dress the grinding wheel, wherein the diamond has an axis substantially coaxial with the axis of the main body. A diamond point dresser formed in a positioned truncated cone shape. 2. A dressing method for dressing a grinding surface of a grinding wheel using the diamond point dresser according to claim 1, wherein the diamond point dresser is arranged so that the tip portion is directed in a rotation direction of the grinding wheel. In the state where the axial direction is inclined at a predetermined angle with respect to the grinding surface, a dressing step of dressing while pressing against the grinding surface at a predetermined dressing point of a peripheral edge portion of the distal end surface of the truncated cone-shaped diamond, A dressing point changing step of changing the dressing point pressed against the ground surface by rotating the diamond point dresser around the axis of the main body.