JPH04336959A - Dressing device for grinding wheel - Google Patents

Abstract

PURPOSE:To provide the dressing device for a grinding wheel, which can be mounted a grinding machine by enabling a grinding stone such as a CBN grinding wheel made of carbide abrasive grains to be formed into a given curved shape, and furthermore making it small in size. CONSTITUTION:A device is made up of a turning body holding body 17 which can be moved to the direction of a Z axis parallel with the rotating shaft of a grinding wheel 14, and to the direction of a X axis normal to the Z axis, and of a turning body 23 which is fitted onto the turning body holding body 17 in such a way as to be rotated around a C axis normal to both the Z and X axes. The device is composed of a rotating drive shaft 25 penetrated through within the turning body 23 in parallel, a tool shaft 20 supported by the turning body 23 in such a way as to be perpendicularly intersected with the C axis, a rotation dressing tool 19 fitted onto the tool shaft 20, a crossed helical gear transmitting the rotation of a rotating drive shaft 25 to the tool shaft 20, and of a numerical control device which controls the movement of the turning body holding body 17 and the turn of the turning body 23.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention relates to a dressing device for a grinding wheel, and more particularly, to a dressing device for a grinding wheel, and more specifically, for example, a grinding wheel such as a CBN grinding wheel (cubic boron nitride grinding wheel) used for grinding raceway grooves in a ball bearing raceway. The present invention relates to a dressing device suitable for forming a grinding wheel using abrasive grains.

0002

[Prior Art] Figures 7 and 8 show an inner ring (1) of a ball bearing.
Grinding wheel (3) for grinding the orbital groove (2)
A conventional example of a dressing device (4) for forming a grinding wheel (3) on a grinding machine is shown.

The raceway groove (2) of the inner ring (1) has a certain curvature, and the outer peripheral surface of the grinding wheel (3) has a raceway groove (2).
It is molded into a convex shape to match the curvature of.

[0004] The dressing device (4) has a rotating arm holder that can move in the horizontal axis (Z-axis) direction parallel to the rotating axis (5) of the grinding wheel (3) and in the horizontal axis (X-axis) direction perpendicular thereto. body (6) and a rotating arm holder (
6) Swivel arm (7) attached to the arm (
7) and a dressing tool (8) using a point diamond attached to it.

[0005]

[Problems to be Solved by the Invention] In the above-mentioned dressing device equipped with a dressing tool using a conventional point diamond, there is a problem that the point diamond wears out quickly. Since it cannot be used to form a grinding wheel, it has been necessary to use a dressing device equipped with a rotary dressing tool using, for example, a rotary diamond.

However, in a conventional dressing device equipped with a rotating dressing tool, the pulleys and belt portion of the belt transmission device that transmits rotation from the motor to the dressing tool may interfere with the grinding wheel or the grinding wheel flange, or the rotating portion of the dressing device may Because the turning radius becomes large and the dressing device itself becomes large, it is difficult to install it on the grinding machine. Conventionally, it is difficult to install a dressing device that can form a CBN grindstone into a convex curvature shape on the same grinding machine. The grinding machine provided did not exist.

[0007] Therefore, it was necessary to once remove the CBN grindstone from the grinding machine and shape it using a separately provided dressing device. In this case, it takes a lot of effort to reinstall it on the grinding machine, and it is difficult to restore the same accuracy as before removal. It could not be used for grinding work.

[0008] An object of the present invention is to provide a grinding wheel that can be formed into an arbitrary curved shape, such as a CBN grinding wheel, and can be further miniaturized so that it can be installed on a grinding machine. The purpose of the present invention is to provide a dressing device for a grindstone.

[0009]

[Means for Solving the Problems] A dressing device for a grinding wheel according to the present invention has a turning device capable of moving in a first axis direction parallel to the rotation axis of the grinding wheel and in a second axis direction perpendicular to the first axis direction. a rotating body holder, a revolving body attached to the revolving body holder so as to be able to rotate around a third axis that is perpendicular to the first axis and the second axis, and a rotational drive shaft passing in parallel within the revolving body. , a tool shaft supported on the revolving body so as to be orthogonal to the third axis, a rotary dress tool attached to the tool shaft, a screw gear that transmits rotation of the rotary drive shaft to the tool shaft, and a revolving body holder. It consists of a numerical control device that controls the movement and rotation of the revolving structure.

0010

[Operation] By numerically controlling the movement of the rotating body holder and the rotation of the rotating body, the outer peripheral surface of the rotary dressing tool can be moved in a circular motion with an arbitrary radius of curvature, so the grinding wheel can be shaped into any curved shape. Can be molded.

[0011] Since a dressing tool that is rotationally driven to shape the grinding wheel is used, even a grindstone made of ultra-hard abrasive grains such as a CBN grindstone can be formed. Furthermore, compared to point diamond dressing tools, there is less wear and the grindstone can be formed in a shorter time.

[0012] Since the rotation of the rotary drive shaft is transmitted to the tool shaft of the rotary dressing tool through the screw gear, there is no need for a belt transmission device, and furthermore, since the rotary drive shaft is passed through the revolving body in parallel, , the turning radius of the turning portion of the dressing device can be reduced. Therefore, the device can be downsized and can be installed on a grinding machine.

[0013]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 6 show parts of a dressing device of a numerically controlled grinding machine. In the following description, FIGS.
The front side is the front, the back side is the rear, and the left and right are the left and right. Further, the horizontal axis in the left-right direction is the X-axis, and the horizontal axis in the front-rear direction is the Z-axis.

As shown in FIGS. 1 and 2, a grinding wheel head (12) is placed on the bed (11) of the grinding machine, and is rotatably supported by the grinding wheel head (12) so as to be parallel to the Z axis. A grinding wheel (14) is attached to the front end of the grinding wheel shaft (13).

A Z-axis slide (slide in the axial direction of the grinding wheel) (15) is placed on the bed (11) on the right side of the grindstone head (12), and an X-axis slide (slide in the radial direction of the grindstone) is placed on the Z-axis slide (15). )(16) is placed on it. On the X-axis slide (16), a mounting part (17a) with an L-shaped cross section and a mounting part (
The vertical cylindrical part (17b) provided above the left end of
) A rotating body holder (17) is fixed thereto.

A revolving body (23) consisting of a rotating shaft (23a) and a tool holder (23b) connected to the rotating shaft (23a) with a pin is attached to the rotating body holder cylindrical portion (17b). The rotating shaft (23a) is located inside the rotating body holder cylindrical part (17b) and is configured to be able to pivot around a vertical axis (C-axis) via a bearing (18), and the tool holder (23b) is the rotating body holder cylindrical part (
17b) Provided to protrude downward. Rotating body (2
3), a rotary drive shaft (25) rotatably supported via a bearing (24) is passed in parallel. Swivel body (
23) A rotary drive device (M1) equipped with a motor is fixed on the top surface, and the rotary drive shaft (25) is rotated by this rotary drive device (M1). A short cylindrical cover (28) is fitted over the upper end of the rotating body holder cylindrical portion (17b) to seal the inside. Rotating axis (23a)
A worm wheel (22) is fixed to the worm wheel (22), and as will be described later, the rotation shaft (23a) is rotated by a rotation drive device (M2) equipped with a servo motor.

The tool holder (23b) is located between the X-axis slide (16) and the grindstone (14), and the grindstone shaft (23b) is located here.
A tool shaft (20) having a horizontal axis at the same height as 13) is rotatably supported. A rotary dressing tool (19) is attached to the tool shaft (20).

The Z-axis slide (15) is a Z-axis drive device (M3) using, for example, a servo motor and a ball screw.
is moved on the bed (11) in the Z-axis direction,
The shaft slide (16) is moved in the X-axis direction by a similar X-axis drive (M4).

Rotary drive device (M1), swing drive device (M
2), Z-axis drive device (M3), and X-axis drive device (M
4) are each connected to a numerical control device (21), and according to commands from the numerical control device (21), the rotary dressing tool (19) can be rotated, rotated around the C-axis, moved in the X-axis direction, and moved in the Z-axis direction. movement is controlled.

As shown in FIG. 3, the tool shaft (20) is rotatably supported at the bottom of the tool holder (23b) via a bearing (35). A screw gear (27) that meshes with a screw gear (26) formed at the tip of the rotary drive shaft (25) is fixed to the tool shaft (20), and the rotary dressing tool (19) is attached to the tool holder (23b). ) It is installed so that it protrudes more. Tool holder (23b)
A labyrinth seal (36) is fixed to the tool shaft (2).
0) is sealed. The rotary dressing tool (19) is
It consists of a short cylindrical tool holder (38) fixed to the tool shaft (20) with a screw (37), and a rotary diamond (39) held by this. The outer peripheral edge of the rotary diamond (39) is in contact with the grinding wheel (14) at one point in the horizontal plane including the tool axis (20), and this is the dressing point (39) at which the grinding wheel (14) is formed.
a) It becomes. The dress point (39a) is always located on the C-axis.

When the rotary drive device (M1) is driven, the rotary drive shaft (25) is rotated, and this rotation is transmitted to the dressing tool (19) by the screw gears (26) and (27). 19) is rotated.

As shown in FIG. 4, the swing drive device (M2)
A swing drive shaft (29) rotated by a swing drive shaft (29) is rotatably supported within a swing drive shaft holder (30) via a bearing (31), and a The worm (32) and a worm wheel (22) fixed to the revolving body (23) are engaged with each other.

When the servo motor of the swing drive device (M2) is driven, the swing drive shaft (29) is rotated, and this rotation is transmitted to the swing structure (23) by the worm (32) and worm wheel (22). The rotating body (23) is rotated around the C-axis.

As shown in FIG. 5, the rotating body holder cylindrical part (
17b) From the right outer side, the bolt (33a) for the right rotation stopper that stops clockwise rotation when viewed from above is screwed in, and from the rear surface of the rotating body holder cylindrical part (17b), the bolt (33a) for the right rotation stopper is screwed in. A left-turn stopper bolt (33b) that stops counterclockwise rotation when viewed from above is screwed in at a different height from the bolt (33a). Projections (34a) (34b) that engage with these bolts (33a) (33b), respectively, protrude from the outer peripheral surface of the pivot shaft (23a) and are shifted by about 1/4 turn in the circumferential direction. It is being Therefore, the rotating body (2
For the rotation in 3), use the right rotation stopper bolt (33a)
The range is limited to approximately 180 degrees between the position where the protrusion (34a) and the left rotation stopper bolt (33b) engage.

FIG. 6 shows the rotary dressing tool (19
) indicates the state of movement and rotation.

When forming the grindstone, first, the rotation drive device (M1) is driven to rotate the rotary diamond (39) according to numerical commands from the numerical control device (21). Next, the Z-axis drive device (M3) and the X-axis drive device (
M4) to move the Z-axis slide (15) and X-axis slide (16), and move the rotary diamond (
39) and the grindstone forming surface (14a) at the dressing point (
39a). Here, the turning drive device (M2) is driven to connect the grindstone forming surface (14a) at the dressing point (39a) and the rotary diamond (3).
9) Rotate the rotating body (23) around the C-axis so that the contact angle with the outer peripheral edge becomes a predetermined value. By simultaneously performing the above-described movement in the X-axis direction, movement in the Z-axis direction, and rotation around the C-axis, the grindstone (14) is formed into a predetermined curved shape.

[0028]

[Effects of the Invention] The dressing device for a grinding wheel according to the present invention can be made compact by reducing the turning radius of the turning portion of the dressing device equipped with a rotating dressing tool, and can be mounted on a grinding machine. becomes possible.

[0029] Therefore, a grinding wheel made of ultra-hard abrasive grains such as a CBN grinding wheel can be formed into an arbitrary curved shape on a grinding machine, and accuracy during grinding can be stabilized and efficiency can also be improved.

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of the present invention.

FIG. 2 is an enlarged partially cutaway front view.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV in FIG. 2;

FIG. 5 is a sectional view taken along line V-V in FIG. 2;

FIG. 6 is a plan view showing the state of the dressing tool when it is turned.

FIG. 7 is a partially cutaway plan view schematically showing a conventional example of a dressing device.

FIG. 8 is a plan view of the same.

[Explanation of symbols]

(13) Grinding wheel shaft (14) Grinding wheel (17) Swivel body holder (19) Rotary dressing tool (20) Tool axis (21) Numerical control device (23) Swivel body (25) Rotation drive shaft (26) Screw gear (27) Screw gear

Claims (1)

[Claims] Claim 1: A rotating body holder movable in a first axis direction parallel to the rotation axis of the grinding wheel and a second axis direction perpendicular to the first axis direction, and perpendicular to the first axis and the second axis. a revolving body attached to a revolving body holder so as to be able to rotate around a third axis forming a revolving body; a rotary drive shaft passing parallel to the revolving body; and a rotating drive shaft supported by the revolving body so as to be orthogonal to the third axis. a rotating dressing tool attached to the tool axis, a screw gear that transmits the rotation of the rotary drive shaft to the tool axis, and a numerical control device that controls the movement of the rotating body holder and the rotation of the rotating body. A dressing device for grinding wheels.