JP2907856B2 - Dressing method of grinding wheel - Google Patents

Description

The present invention relates to a dressing method for a grinding wheel, particularly a superabrasive grinding wheel such as a diamond wheel and a CBN wheel.

[Prior Art] To perform truing and dressing (hereinafter, truing and dressing are collectively referred to as dressing) of superabrasive grinding wheels (hereinafter, referred to as superabrasive wheels) such as diamond wheels and CBN wheels. It required a lot of time and experience.

Techniques for solving the above-mentioned problems include, for example,
There is one disclosed in JP-A-62-264866. That is, as shown in FIGS. 5 (a) and 5 (b), while rotating the cup-shaped dressing grindstone 3 on the rotating superabrasive grindstone 1 continuously in the vertical direction. I do.
The dressing is terminated when the dressing resistance applied to the dressing grindstone 3 decreases to a predetermined value, so that the sharpness of the superabrasive grindstone 1 becomes constant. At this time,
The dressing whetstone 3 rotates around the axis, and the surface 2
Is dressed in the direction of the axis of rotation of the superabrasive grinding wheel 1, even if the surface 2 is deformed by processing, this deformation is not transferred to the dressing grindstone 3. Moreover, since the dressing grindstone 3 moves only in the vertical direction, dressing can be performed in the shortest time. In addition, by arranging the dressing grindstone 3 at a position that does not hinder processing, dressing can be performed even during grinding, and the grinding can be automated.

[Problems to be solved by the invention]

However, in the above-described conventional technology, the surface 2 is not flat, and minute unevenness occurs. Hereinafter, the sixth
This will be described in more detail with reference to FIGS. As shown in FIG. 3A, the axis O ′ of the dressing grindstone 3 is on the bisector of the width S of the superabrasive grindstone 1.
The width W of the dressing grindstone 3 on the dividing line is arranged so as to be bisected by the axis of the superabrasive grindstone 1. Here, attention is paid to the outer edge 4 of the dressing grindstone 3 and the outer edge 4
Surface only after dressing
Has a convex shape as shown in FIG. Also,
Similarly, focusing on the inner edge 5 of the dressing grindstone 3 and assuming that only the inner edge 5 has abrasive grains, the cross section of the surface 2 after dressing has a concave shape as shown in FIG. Since the abrasive grains are present on the entire surface of the width W of the dressing whetstone 3, the cross section of the surface 2 after dressing is as shown in FIG. . That is, even if the surface of the dressing grindstone 3 is completely flat, the surface 2 is not flat, and irregularities are formed. Although the height of the unevenness can be reduced by reducing the width W of the dressing grindstone 3, there is a problem that the dressing grindstone 3 is consumed quickly.

Also, as shown in FIG. 7, the axis O ′ of the dressing grindstone 3 is arranged on the axis of the superabrasive grindstone 1, and the width W is made larger than the width S of the superabrasive grindstone 1. When dressing is performed while rotating around the center O ', the above-described irregularities are not formed, and the surface 2 becomes flat. However, if the surface 2 is deformed by processing, the deformation is transferred to the dressing grindstone 3 by dressing, and the surface 2 cannot be flattened.

To solve only the flattening of the surface 2, for example, as shown in FIG. 8, while rotating the dressing grindstone 3, the axis of the dressing grindstone 3 is aligned with the rotating surface of the superabrasive grindstone 1. What is necessary is just to move in the plane of a right angle. However, in this case, it is assumed that dressing is started from (a) in FIG.
The dressing grindstone 3 is moved along the arrow shown in FIG. That is, the movement in the plane and the vertical feed for cutting must be alternately performed, so that the efficiency of dressing cannot be improved.

An object of the present invention is to solve the above-mentioned problems, improve the flatness of the surface 2, and provide a dressing method capable of performing dressing with high efficiency.

[Means for solving the problem]

The above-mentioned problem is solved by rotating the dressing grindstone 3, moving the rotation axis of the dressing grindstone 3 in a plane perpendicular to the rotation surface of the superabrasive grindstone 1, and cutting the superabrasive grindstone 1. You.

In an embodiment of the present invention to be described later, in order to move the rotation axis of the dressing grindstone 3 in a direction perpendicular to the rotation surface of the superabrasive grinding wheel 1, the rotation axis of the dressing grindstone 3 is changed. By rotating about another axis parallel to this, that is, by orbiting,
Has been realized.

[Action]

Since the rotation axis of the dressing grindstone 3 moves in a plane perpendicular to the rotation plane of the superabrasive grinding wheel 1, the surface 2
The unevenness shown in FIG. 4D does not occur. Similarly, even if the surface 2 is deformed by processing, this deformation is not transferred to the dressing grindstone 3. Therefore, the surface 2 can be made flat.

Furthermore, since the axis of rotation of the dressing grindstone 3 is moved vertically while moving in a plane perpendicular to the rotation surface of the superabrasive grindstone 1, the efficiency of dressing can be improved.

〔Example〕

FIG. 1 is a front sectional view of a first dressing apparatus embodying the present invention, which is mounted on a grinding wheel head of a surface grinding machine.
FIG. 2 is a sectional view taken along the line II of FIG.

Reference numeral 11 denotes a grinding wheel head of a surface grinding machine that rotatably supports the superabrasive grinding wheel 1. A base 12 is fixed to the grinding head 11. 13
Is a guide, along a guide surface 14 provided on the base 12,
It is slidable in the vertical direction in FIG. 15 is the main shaft,
The two bearings 16 rotatably support the guide 13. 17 is a pulley. 18 is a whetstone axis. The axis O 'of each of the four grinding wheel shafts 18 is parallel to the axis O of the main shaft 15 and is at the same distance from the axis O. Further, spur teeth 19 are formed on the outer peripheral portion of the grinding wheel shaft 18, and are rotatably supported on the main shaft 15 by two bearings 20 respectively. Reference numeral 21 denotes an internal gear fixed to the lower end of the guide 13 and engaged with each spur tooth 19 of the grinding wheel shaft 18. 3 is a cup-shaped dressing whetstone fixed to the whetstone shaft 18. 22 is a motor base fixed to the guide 13. Reference numeral 23 denotes a motor, which is fixed to a motor base 22. 24 is a pulley. 25 is a belt, pulley 17 and pulley 24
And are connected. Reference numeral 26 denotes a feed screw, which is rotatably supported on the upper end side of the base 12 and is screwed with the guide 13. 27 is a gear fixed to the feed screw 26. 28 is a motor. Reference numeral 29 denotes a gear fixed to the output shaft of the motor, which is engaged with the gear 27.
Reference numeral 30 denotes a cover. In addition, as shown in FIG.
The axis O of the main shaft 15 is disposed substantially on the axis of the superabrasive grindstone 1. The distance between the surface passing through the center of the width S of the superabrasive grinding wheel 1 and the axis O is substantially equal to the distance OO ', and the diameter of the inner edge portion 5 of the dressing grinding wheel 3 is larger than the width S. Less than,
The operation will be described.

When the motor 23 is rotated, the main shaft 15 rotates via the pulley 24, the belt 25, and the pulley 17, and the grindstone shaft 18 supported by the main shaft 15 also rotates around the axis O. At this time, since the spur teeth 19 are engaged with the internal gear 21, the grinding wheel shaft 18 rotates around the axis O '. That is, the dressing grindstone 3 revolves around the axis O while rotating around the axis O '. When the motor 28 is rotated in this state, the feed screw 26 rotates via the gear 29 and the gear 27,
The guide 13 moves downward, and the dressing grindstone 3 is cut into the superabrasive grindstone 1 to perform dressing. At this time, (1) all working surfaces of the dressing whetstone 3
Due to the orbital motion, the superabrasive grinding wheel 1 passes across the highest ridge line in a direction substantially parallel to the side surface of the superabrasive grinding wheel 1. Therefore, the unevenness shown in FIG. 6D does not occur.

(2) The working surface of the dressing grindstone 3 passes through the superabrasive grain grindstone 1 substantially in the width direction by the rotation. Therefore, even if the surface 2 is deformed by the processing, this deformation is not transferred to the dressing grindstone 3.

(3) Dressing is possible only by the rotating motion and the cutting motion of the main shaft 15, and there is no need to particularly provide a mechanism for performing the lateral feed motion. Further, the value obtained by dividing the cutting speed by the rotation speed of the main shaft 15 is the dressing cutting amount. Therefore, for example, even if the cutting amount is reduced, the efficiency can be improved by increasing the rotation speed of the main shaft 15.

Here, the members described with reference to FIG. 1 are all mounted on the base 12 except for the superabrasive grinding wheel 1 and the grinding head 11. Accordingly, the base 12 and the members mounted on the base 12 in FIG. 1 will be collectively referred to as a dressing apparatus A hereinafter.

FIG. 3 shows a second embodiment of the present invention. In the figure, reference numeral 31 denotes a dressing device. In the dressing device A, a base 12 and a guide 13 are provided.
And a feed screw 26, a gear 27, a gear 29, and a motor 28 for moving the guide 12 up and down are removed. Reference numeral 32 denotes a table on which the work is placed, and reference numeral 33 denotes a column which supports the grinding head 11 so as to be movable in the vertical direction.
In this embodiment, the dressing device 31 is connected to a table.
32, and the cutting motion of the dressing is performed using a cutting mechanism on the grinding machine side. Therefore, the dressing device can be simplified. The operation is substantially the same as that of the first embodiment, and a description thereof will be omitted.

FIG. 4 shows a third embodiment of the present invention, in which a dressing device 31 is mounted on a column 33.
As in the second embodiment, the cutting motion of the dressing utilizes a cutting mechanism on the grinding machine side.

By the way, in the above-mentioned first to third embodiments, it is a part of the working surface of the dressing grindstone 3 that comes into contact with the superabrasive grindstone during one revolution. Therefore, when the ratio between the number of rotations of the rotation and the number of revolutions is an integer, only a specific part of the dressing grindstone 3 is selectively removed. Therefore, it is preferable that the ratio between the rotation speed of the rotation and that of the revolution does not become an integer.

In this embodiment, the case in which the number of the grinding wheel shafts 18 is four is shown, but one or more grinding wheel shafts 18 may be used. Also, the grinding wheel shaft 18
May be rotated by a motor. Further, the revolving direction may be one direction, for example, the axis O
Reciprocation in the direction of rotation around the axis, that is, when rotated 180 degrees clockwise about the axis O, 1
The rotation of 80 degrees may be repeated. Although the case of dressing has been described above, the present invention can also be applied to a case in which a surface related to processing of a superabrasive grindstone is formed into a flat surface parallel to the rotation axis, or the outer periphery is formed into a perfect circle, that is, so-called truing. Further, it goes without saying that the present invention is not limited to the super-abrasive grindstone, but can be applied to a case where another grinding grindstone is dressed.

〔The invention's effect〕

As described in detail above, according to the present invention, the dressing grindstone 3 rotated around the axis is moved around another axis parallel to the axis and cut in the direction of the axis. I do. As a result, it is possible to flatten the surface 2 of the superabrasive grindstone in which the axis of rotation is arranged in a direction perpendicular to the axis of rotation of the dressing grindstone, and it is possible to improve the dressing work efficiency. There is.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a first dressing apparatus embodying the present invention. FIG. 2 is a sectional view taken along the line II of FIG. FIG. 3 and FIG. 4 are second and third embodiments of the present invention. 5 to 8 are explanatory diagrams of the prior art. 1 ... super-abrasive grindstone, 3 ... dressing grindstone, 12 ... base, 13 ... guide, 15 ... spindle, 18 ... grindstone shaft, 19 ...
... spur teeth, 21 ... internal gears, 23, 28 ... motors.

Claims (1)

(57) [Claims] An axial center of a grinding wheel and a cup-shaped grinding wheel, each of which rotates, is arranged at right angles to each other, and the grinding wheel and the cup-shaped grinding wheel are cut relatively in the axial direction of the cup-shaped grinding wheel. In the method of dressing a grinding wheel, the cup-shaped grinding wheel is revolved in parallel with the axis of the grinding wheel, and the rotating grinding wheel and the cup-shaped grinding wheel that rotates and revolves are rotated by a cup-shaped grinding wheel. A dressing method for a grinding wheel, characterized in that the grinding wheel is dressed by being relatively cut in the center direction.