JPH0818231B2 - Cutter polishing equipment - Google Patents

Description

The present invention relates to a polishing device for a cutter used in a gear cutting machine.

[Conventional technology]

When manufacturing a gear, a gear cutting machine is used to cut a gear while rotating a cutter made of cemented carbide that has been processed into a certain shape. Since the cutter wears, it is necessary to periodically grind the cutter with a grindstone.

Heretofore, when polishing the cutter, it has been usual to use a cam copying plate in the shape of a cutter to perform copying control and polish each side of the cutter.

[Problems to be solved by the invention]

However, when the above-mentioned copying control is performed, the grindstone comes into contact with the cutter only from a certain direction, so that the grindstone cannot be used efficiently.

Further, since one tooth surface is alternately ground with respect to the cutter, the cutter needs to be replaced, which is troublesome.

The present invention has been made in view of such circumstances, and provides a cutter polishing apparatus that can polish the front and back of a cutter in one run, can also effectively use a grindstone, and can easily dress the grindstone. With the goal.

[Means for solving problems]

A cutter polishing apparatus according to the present invention which meets the above-mentioned object includes a cutter holding device having an up-down movement and an indexing device for receiving a cutter for gear cutting to be polished, and a vertical and horizontal movement relative to the cutter. Is a cutter polishing device including a whetstone with a rotary drive source that moves in a rotatable manner, a numerical control device that controls these, and a whetstone dresser that is arranged at a position that is a certain distance away from the cutter. The controller stores the polishing shape of the cutter, and the polishing surface of the grindstone is rotated with the inner side of a certain distance from the polishing surface as an origin while the distance between the polishing surface of the cutter and the origin and the grindstone. Numerical control means for moving while maintaining the distance from the dresser to the origin is provided.

[Action]

In the cutter polishing apparatus according to the present invention, since the grindstone moves in the vertical and horizontal directions relative to the cutter and is further rotatable, the grinding shape of the cutter to be ground is input in advance, and the grindstone surface is also input. When a starting point is input at a constant distance from, and the control means in the control device is numerically controlled so that the surface of the rotating grindstone moves the surface trajectory of the cutter, the surface of the cutter is polished to a constant shape.

Also, since the position of the whetstone dresser has been determined,
By moving the grindstone by numerical control, the polishing surface of the grindstone can be dressed into a predetermined shape.

In this case, by inputting a position at a constant distance from the position where it abuts against the grindstone dresser as the origin, a constant position from the grindstone polishing surface can be input as the origin regardless of how the grindstone is used.

〔Example〕

Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.

Here, FIG. 1 is a plan view of a cutter polishing apparatus according to an embodiment of the present invention, FIG. 2 is a partial plan view illustrating the operation of the cutter polishing apparatus, and FIG. 3 is a side view of the cutter polishing apparatus. Is.

As shown in FIG. 1, a cutter polishing apparatus 10 according to one embodiment of the present invention is a cutter 11 for a gear cutting machine to be polished.
It has an X-direction moving mount 12 for mounting, a turntable 14 for mounting a grindstone 13 arranged facing the cutter 11, a Y-direction moving mount 15 for mounting the turntable 14, and these auxiliary devices. Is configured. These will be described in detail below.

The X-direction moving base 12 is provided so as to be movable in the X-direction, and is provided with a rotary encoder (not shown), and the position thereof is input to the numerical controller. A shaft 16 for fixing the cutter 11 is mounted on the X-direction moving base.
The shaft 16 is provided with an indexing device for rotating the shaft 16 at a constant angle, so that the cutter 11 can be rotated at an arbitrary angle and can be held at a predetermined angle. The shaft 16 is attached to the X-direction moving base 12 via an elevating device 17 so that the cutter 11 can be held at a constant height.

The Y-direction moving mount 15 is provided with a rotary encoder that moves so as to be orthogonal to the X-direction moving mount 12 and measures the moving distance, and the output thereof is input to the numerical controller.

A turntable 14 is provided above the Y-direction moving base 15, and a front-back moving device is mounted on the turntable 14.
A grindstone 13 is connected to a motor 19 via 18 and is rotatably provided.

The shaft 16, the lifting device 17, the turntable 14 and the longitudinal movement device 18 are provided with a sensor such as a rotary encoder for detecting the moving distance and the rotation angle, and the output thereof is input to the numerical control device and the cutter. The position of 11 and the position and angle of the grindstone with respect to the cutter 11 can be input.

 In the figure, 20 indicates a hydraulic unit and 21 indicates a dust collector.

Next, with reference to FIG. 2, the operation of the cutter polishing apparatus 10 will be described in detail. First, the grindstone 13 at the standby position 22 with the preset origin a as a reference is moved in the Y direction moving mount 15 and the X direction. Operate the mobile stand 12 to move the grindstone 13
Move as shown by arrows b, c, d, and turntable
14 is rotated, the direction of the grindstone 13 which is rotationally driven by the motor 19 is directed in the vicinity of the polishing surface of the cutter 11 at a substantially right angle so that the predetermined polishing surface 23 of the grindstone 13 contacts the cutter 11 for a predetermined length. To do.

Then, the X-direction moving mount 12, the Y-direction moving mount 15 and the turntable 14 are numerically controlled to move the grindstone 13 to the arrows e, f, g according to the polishing curve of the cutter 11 to be ground.
Move like h. As a result, the cutter 11 is ground into a constant shape (for example, an involute curve), but the cutter 11 is advanced by the polishing allowance on the way back and forth.

In this case, if the grindstone 13 abutting the cutter 11 hits only a certain surface, that part decreases, so that the grindstone 13 is set to the origin P.
Is formed in a circular arc shape with respect to the center, and the whole is controlled so that the grindstone gradually rotates (swings) around the origin P in the middle of grinding, so that the entire surface of the grindstone 13 can be ground. Therefore, the partial consumption of the grindstone 13 can be reduced.

After that, the cutter 11 is indexed, and the grindstone 13 is repeatedly subjected to the above steps (e, f, g, h) so as to grind the entire tooth. However, after the grindstone 13 is used for a preset time, the grindstone dressing is performed. I do.

In this case, the grindstone 13 is moved in the manner of i, j, k so as to be brought into contact with the grindstone dresser 24 made of diamond. Here, it is assumed that the grindstone dresser 24 is attached to the cutter 11 at a fixed position in three dimensions.

Then, the grindstone 13 is brought into contact with the grindstone dresser 24 at a constant angle (θ), and from that point, a constant length l (for example, 30
(mm) position is the origin P of the grindstone, and with this origin P as a reference, the turntable 14 is controlled to rotate the grindstone 13 to finish the surface of the grindstone 13 in an arc shape.

Then, the grindstone 13 is moved as shown by arrows 1 and m, and then the movements of the arrows e, f, g, and h are repeated to continue the polishing of the cutter 11, or the polishing of the cutter 11 is completed. If there is, the grindstone 13 returns to the standby position 22 through the steps of l, m, n and o.

Since the cutter 11 is polished by repeating the above steps, the front and back cutters can be polished in one step, and even if the number of grindstones decreases, the distance between the origin P and the polishing surface is always constant, so stable polishing can be performed. Furthermore, since the polishing surface of the grindstone has a circular arc shape and can be controlled so as to grind the entire surface uniformly, there is no partial abrasion of the grindstone and the grindstone dressing is easy.

In the above embodiment, the grindstone 13 is placed on the X-direction moving base 12.
Although the cutter 11 is arranged on the Y-direction moving base 15, the present invention is not limited to these, and the present invention is not limited to these as long as the grindstone can move vertically and horizontally relative to the cutter and can rotate. Applied.

〔The invention's effect〕

As is clear from the above description, the cutter polishing apparatus according to the present invention moves the polishing wheel while being numerically controlled so that the grindstone can rotate vertically and horizontally and can be rotated, so that the front and back sides of the cutter can be separately polished as in the conventional case. No need to polish,
It has become possible to polish the front and back of the cutter in one step.

In addition, since the grindstone is rotated (swinged) from the polishing surface of the grindstone as an origin to rotate (swing) to perform dressing and polishing of the grindstone, dressing becomes easy, and further, the surface of the grindstone is partially worn. Without using it, the grindstone can be used evenly, and a long life can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of a cutter polishing apparatus according to an embodiment of the present invention, FIG. 2 is a partial plan view illustrating the operation of the cutter polishing apparatus, and FIG. 3 is a side view of the cutter polishing apparatus. [Explanation of symbols] 10 …… Cutter polishing device, 11 …… Cutter, 12 …… X direction moving stand, 13 …… Whetstone, 14 …… Turntable, 15…
… Y direction moving stand, 16 …… axis, 17 …… elevator, 18 ……
Front-rear movement device, 19 …… motor, 20 …… hydraulic unit, 21
…… Dust collector, 22 …… Standby position, 23 …… Polishing surface

Claims (1)

[Claims] 1. A cutter holding device with an indexing device for receiving a cutter for gear cutting to be polished, and a rotary drive source for moving in a vertical and horizontal direction relative to the cutter and further rotatably. The grindstone, a numerical control device for controlling these, and a cutter polishing device having a grindstone dresser arranged at a constant distance from the cutter, wherein the control device includes the cutter. The grinding shape is memorized, and the grinding surface of the grindstone moves while maintaining the distance between the grinding surface of the cutter and the origin and the distance from the grindstone dresser from the origin while rotating with the inner side of the grinding surface at a certain distance from the origin. A cutter polishing device characterized in that it is provided with a numerical control means.