JPH08168958A - Method and device for dressing electrodeposition grinding wheel - Google Patents

Abstract

PURPOSE: To provide a method for dressing an electrodeposition grinding wheel, in which the life of the electrodeposition grinding wheel can be extended by re-sharpening the same. CONSTITUTION: To dress an electrodeposition grinding wheel 1, a dressing grinding stick 12 is pressed against the dulled grinding surface 1a of an outer peripheral side of the electrodeposition grinding wheel 1 while being rotated about its axis, so that the grinding surface 1 is rubbed uniformly with an appropriate pressing force and dressed efficiently with less abrasive grains dropping off. In this case, when the electrodeposition grinding wheel 1 is freely rotatably supported on axis, it is dressed throughout its circumference while being forced to make a slow rotation following the grinding stick 12 by the pressing and rotating forces of the grinding stick 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for refurbishing an electrodeposition grindstone, and more specifically, it regenerates the sharpness of an electrodeposition grindstone in which abrasive grains are electrodeposited to improve the life of the grindstone. Revision technique for prolonging.

[0002]

2. Description of the Related Art An electrodeposited grindstone is composed of a large number of non-conductive abrasive grains adhered and held on the surface of a conductive base metal by electroplating of nickel or the like to form an abrasive grain layer. This abrasive grain layer usually has a single layer structure consisting of one layer of abrasive grains, and when this one layer of abrasive grains wears due to use and causes crushing or clogging, it is no longer possible to regenerate the whetstone surface. Therefore, the electrodeposition grindstone is generally used as a so-called disposable grindstone.

[0003]

The abrasive grains used in this kind of electrodeposition grindstone are made of a material having a relatively high hardness and a high grinding ratio, such as diamond or CBN, and have high efficiency and long life. While grindable, these materials are relatively expensive.

The life of the electrodeposition grindstone is judged on the basis of when the grinding efficiency is below a certain level. Upon observing, not all of the electroplated abrasive grains were worn out and dropped, but as a result of abrasion of some abrasive grains, crushing or clogging occurred, and the sharpness of the electrodeposited grindstone itself It is often bad.

In other words, in the past, even though the abrasive grains were still usable, that is, the electrodeposited whetstone having a reproducible whetstone surface, it was replaced with a new electrodeposited whetstone, which saved resources. The improvement has been demanded also from the demand for cost reduction and cost reduction.

The present invention has been made in view of the above problems, and an object of the present invention is to regenerate the sharpness of an electrodeposition grindstone to extend the life of the grindstone. It is to provide a dressing method and a dressing device.

[0007]

In order to achieve the above object, a method for refurbishing an electrodeposition grindstone according to the present invention is such that a retouching stick grindstone is pressed against a grindstone surface of the electrodeposition grindstone while being rotated around its axis. The feature is that the surface of this grindstone is adjusted.

A dressing device for an electrodeposition grindstone of the present invention implements the above-mentioned dressing method, wherein a dressing stick grindstone has a shaft line of the dressing headstock on the spindle of the dressing headstock. While being substantially perpendicular to the surface and rotatably supported around its axis, the main shaft is drivingly connected to a rotary drive source, and the stick grindstone and the grindstone surface are relatively It is characterized in that it can be approached or separated.

[0009]

In the present invention, when the electrodeposition grindstone is dressed, the dressing stick grindstone is rotated around its axis and pressed against the grindstone surface of the electrodeposited grindstone with reduced sharpness, so that the grindstone surface is It is rubbed uniformly with a proper pressing force, and efficient dressing with less loss of abrasive grains is performed.

In this case, the electrodeposition grindstone is in the form of a disk-shaped grindstone wheel which is rotatably supported.
When the electrodeposition grindstone surface is formed on the side surface of the outer peripheral portion, the electrodeposition grindstone is efficiently rotated around the entire circumference while being slowly and forcibly rotated by the pressing rotational force of the stick grindstone.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

A grinding machine equipped with a dressing device according to the invention is shown in FIGS. This grinding device is specifically for deep groove grinding that grinds the groove wall surface of a work (work) W as shown in FIG. 6, and has a thin disk-shaped electrodeposition grinding wheel 1 as a main part. In addition to being configured, it is provided with a pair of dressing devices 2 and 2 for dressing the grindstone surfaces 1a and 1b of the electrodeposition grinding wheel 1.

As shown in FIG. 6, the work W is an annular work having a circular through hole Wa at the center thereof.
A deep groove Wb to be ground is formed on a part of the inner peripheral surface of the through hole Wa.
Are formed to extend radially outward. Wc is deep groove Wb
2 shows a circular recess for machining formed on the bottom of the. As shown in FIGS. 3 to 5, the work W is positioned and held in a horizontal state on the work holding table 4 of the apparatus base 3. Correspondingly, the work holding table 4 has through holes 4a which allow the electrodeposition grinding wheel 1 to move in the cutting direction A and the correction direction B in the vertical direction corresponding to the through holes Wa of the work W. Has been installed throughout. Reference numeral 30 denotes a work holder for positioning and fixing the work W on the work holding table 4.

The electrodeposition grinding wheel 1 has such a thickness that it can be inserted into the deep groove Wb of the work W, and electrodeposition grinding wheel surfaces 1a and 1b are formed on both side surfaces of the outer peripheral portion thereof. The grindstone surfaces 1a and 1b have a single layer structure in which so-called super-abrasive grains such as diamond grains and CBN grains are attached and held by electroplating of nickel or the like.

The electrodeposition grinding wheel 1 is a grinding wheel driving device, which is rotatably supported by a holder arm 5 and which has a transmission belt (power transmission means) 6 wound around an outer peripheral groove thereof. It is drivingly connected to a drive motor (not shown).

The halter arm 5 has an outer dimension that can be inserted into the through hole Wa of the work W, and its base end, that is, the upper end is attached to a holder main body (not shown). The holder motor is mounted on the holder body, and is movable in the cutting direction A and the correction direction B by a driving device (not shown).

The holder arm 5 is provided so as to project downward from the holder body, that is, in the cutting direction A, and
At the tip portion, that is, the lower end portion, the electrodeposition grinding wheel 1 is
As shown in the figure, the grinding portion is mounted so as to project. The outer peripheral contour shape dimension including the electrodeposition grinding wheel 1 and the holder arm 5 is designed so that it can be inserted into and withdrawn from the through hole Wa which is a processing space of the work W.

As shown in FIGS. 1 and 2, the pair of dressing devices 2 and 2 are arranged so as to correspond to the grinding wheel surfaces 1a and 1a of the electrodeposition grinding wheel 1, respectively.

Both of the dressing devices 2 and 2 have the same structure, and FIGS. 4 and 5 show the structure of one dressing device 2. The dressing device 2 is arranged on the device base 3 in a direction (arrow C direction, which corresponds to the correction direction B in the illustrated embodiment) toward or away from the grindstone surface 1a (1b) of the electrodeposition grinding wheel 1. ) Is arranged to be movable. Specifically, the dressing device 2 is mounted on the moving table 10, and the moving table 10 is moved by a moving device (not shown).
It is possible to move in the arrow C direction on the guide rail 11 of the device base 3.

The dressing device 2 is mainly composed of a dressing headstock 13 having a dressing stick grindstone 12 and a drive motor 14 as a rotational drive source thereof.

The dressing headstock 13 has mounting bolts 15, 1
5, the column 16 is mounted horizontally and height-adjustable, and the column 16 is provided on the movable table 10 in a vertically standing state. A main spindle 17 is rotatably supported on the dressing headstock 13 by bearings 18, 18.

The main shaft 17 has a hollow cylindrical shape. The stick grindstone 12 is inserted and supported in the main shaft 17, and a transmission pulley 19 mounted and fixed to a base end portion of the drive motor 14 is fixed by a transmission belt 20. It is linked to the transmission pulley 21. The drive motor 14 is horizontally disposed on the movable table 10 via a support bracket 22, and the transmission pulley 21 is attached and fixed to the drive shaft 14a.

The stick grindstone 12 is specifically
A rod-shaped member made of an alumina-based abrasive such as WA or an alumina-based abrasive such as GC, and its tip surface 12
a is set as the retouching surface. The stick grindstone 12 can be inserted into the hollow inside of the main shaft 17, and is integrally fixed to the main shaft 17 by a tightening bolt 25. When the stick grindstone 12 is fixed to the main shaft 17, the axis of the stick grindstone 12 is set to be substantially perpendicular to the grindstone surface 1 a of the electrodeposition grinding wheel 1.

As a result, when the drive shaft 14a of the drive motor 14 is rotationally driven, the main shaft 17 and the stick grindstone 12 integrated with the main shaft 17 are transmitted through the transmission pulley 21, the transmission belt 20 and the transmission pulley 19. It is rotated with speed. Further, the moving table 10 is moved in the arrow C direction by a moving device (not shown), and the dressing surface 12a of the stick grindstone 12 is rotated and the electrodeposition grindstone 1 is rotated.
It is brought into contact with the grindstone surface 1a with a predetermined pressing force to perform the dressing operation.

In the grinding apparatus configured as described above, the grinding wheel surfaces 1a and 1b of the electrodeposition grinding wheel 1 are used to
Both wall surfaces 40a and 40b (see FIG. 6) of the deep groove Wb of the work W are sequentially ground.

That is, first, by adjusting the movement of the holder arm 5 in one of the correction directions B, the position of one grinding wheel surface 1a of the electrodeposition grinding wheel 1 is adjusted with respect to the wall surface 40a of the deep groove Wb. Subsequently, the electrodeposition grinding wheel 1 is rotated through the transmission belt 6 by the rotation driving of a drive motor (not shown), and the holder arm 5 is lowered in the cutting direction A while the grinding wheel surface 1a causes the deep groove Wb. Wall surface 40a is ground. When the grinding of the wall surface 40a is completed, the holder arm 5 rises, and the electrodeposition grinding wheel 1 rises and returns to the initial position.

Next, the position of the other grinding wheel surface 1b of the electrodeposition grinding wheel 1 is adjusted with respect to the wall surface 40b of the deep groove Wb by adjusting the movement of the holder arm 5 in the correction direction B (the opposite direction to the above). After that, the wall surface 40b is ground by the same operation as described above. After that, this series of grinding operations
It is sequentially repeated for the deep groove Wb of the subsequent work W.

When the sharpness of the grindstone surfaces 1a, 1b of the electrodeposition grinding wheel 1 decreases after grinding a plurality of works W, the dressing work by the dressing devices 2, 2 is performed respectively. This dressing operation is performed in a state in which the electrodeposition grinding wheel 1 is returned to the initial position by ascending and the electrodeposition grinding wheel 1 is free from the forced rotation by the drive motor.

That is, as described above, in each dressing device 2, the stick grindstone 12 is rotated at a predetermined speed around its axis by the rotational drive of the drive motor 14 (the rotational direction of both stick grindstones 12, 12). Are opposite to each other), and due to the approaching movement of the moving base 10 in the direction of the arrow C, the retouching surface 12a of the stick grindstone 12 has an appropriate pressing force against the grindstone surfaces 1a and 1b of the electrodeposition grindstone 1 with reduced sharpness. The whetstone surfaces 1a and 1b are abutted against each other and are rubbed at the same time and uniformly, and are retouched.

In this case, the electrodeposition grinding wheel 1 is rotatably supported by the stop of the drive motor, and therefore the electrodeposition grinding wheel 1 is rotated by the pressing rotational force of the stick grinding wheel 12. While slowly rotating in the direction of the arrow D (see Fig. 3), the grinding wheel surface 1
Dressing is performed over the entire circumference of a and 1b.

As described above, by simultaneously driving the pair of dressing devices 2 and 2 to carry out the dressing work of both the grindstone surfaces 1a and 1b at the same time, both stick grindstones 12 and 1 are
As a result of the pressing rotational force of 2 acting on the electrodeposition grinding wheel 1 from both sides at the same time, the forced rotation of the electrodeposition grinding wheel 1 is smoothly performed in a well-balanced manner, and high-efficiency dressing is secured.

Of course, it is also possible to individually drive the dressing surfaces 2a and 1b of the electrodeposition grinding wheel 1 individually by driving the dressing devices 2 and 2 sequentially instead of simultaneously.

In this embodiment, the dressing work by the dressing device 2 is appropriately carried out so that the electrodeposition grinding wheel 1
It has been tentatively proved that the service life of is extended almost twice as compared with the conventional one.

It should be noted that the above-described embodiments are merely for showing preferable specific examples of the present invention, and the present invention is not limited to these embodiments, and various design changes can be made within the scope thereof. . The modified examples are listed below.

(1) In the illustrated embodiment, the dressing work is carried out with the drive motor of the electrodeposition grinding wheel 1 stopped, but the electrodeposition grinding wheel 1 is driven by the drive motor. It may be performed while being forcedly rotated.

(2) In the illustrated embodiment, the stick grindstone 12 is structured to approach or separate from the grindstone surfaces 1a, 1b of the electrodeposition grinding wheel 1, but the electrodeposition grinding wheel 1 A structure for approaching or separating the stick grindstone 12 may be adopted.

(3) In the illustrated embodiment, the belt transmission structure using the transmission belt 6 is adopted as the power transmission means for drivingly connecting the electroplated grinding wheel 1 to its drive motor. Other power transmission means such as a transmission mechanism may also be employed.

(4) The grinding apparatus of the present invention is used for grinding not only the deep groove Wb in the through hole Wa of the annular work W as in the illustrated embodiment, but also other machined surfaces having a restricted machining space. Applicable. In this case, when the work surface is only one surface, the grinding wheel surface of the electrodeposition grinding wheel 1 may be one surface, and the dressing device 2 is also configured to have only one surface for this one surface.

(5) Further, in the above-mentioned embodiment, the structure is such that the grindstone surface is formed on the side surface of the outer peripheral portion of the electrodeposition grinding wheel 1. As shown in FIG. 7, it is also applicable to the case where the grindstone surface 1c is formed on the outer peripheral surface of the electrodeposition grinding wheel 1.

In other words, the tip of the stick grindstone 12 is a conical dressing surface 12b, and the grinding surface 1c of the electrodeposition grinding wheel 1 is dressed by the rotation of the dressing surface 12b. There is. In addition, the electrodeposition grinding wheel 1 at the time of this dressing
Normally, the rotation is forced by a drive motor, but a structure in which the electrodeposition grinding wheel 1 rotates together with the rotation of the stick grindstone 12 can be adopted as in the above-described embodiment.

(6) In the illustrated embodiment, the description of the specific configuration of the drive unit of each component is omitted, but these drive units are controlled by the control device in a semi-automatic or full-automatic manner. It is controlled automatically.

[0042]

As described in detail above, according to the present invention,
When dressing the electrodeposition grindstone, the dressing stick grindstone was rotated around its axis while being pressed against the grindstone surface of the electrodeposited grindstone with reduced sharpness, so that the grindstone surface had an appropriate pressing force and Evenly rubbed, efficient removal of abrasive grains is performed.

As a result, even in an electrodeposited grindstone having a single layer of abrasive grains, when this layer of abrasive grains wears due to use and causes crushing or clogging, the dressing method of the present invention is appropriately carried out. By doing so, the grinding wheel surface can be regenerated and the life of the grinding wheel can be greatly extended. By the way, it has been tentatively proved that, by adopting the present invention, the life of the electrodeposition grindstone is extended to about twice or more that of the conventional one.

Further, since the above electrodeposition grindstone is in the form of a disk-shaped grindstone wheel that is rotatably supported, and the electrodeposition grindstone surface is formed on the outer peripheral side surface,
By the pressing rotational force of the stick grindstone, the electrodeposition grindstone is rotated around the entire circumference while being slowly and forcibly rotated. As a result, the rotating power of the electrodeposition grindstone is unnecessary, and more uniform and highly efficient realignment can be realized by the synergistic effect of the rotation of the electrodeposition grindstone at an appropriate speed and the rotation of the stick grindstone.

[Brief description of drawings]

FIG. 1 is a front view showing a partial cross-section of a main part of a grinding apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view showing a partial cross-section of a main part configuration of the grinding apparatus.

FIG. 3 is a side view showing a partial cross-section of a main part of the grinding apparatus.

FIG. 4 is a front view showing a dressing device of the grinding device.

FIG. 5 is a plan view showing the dressing device of the grinding device in a partial cross section.

FIG. 6 is a perspective view showing a workpiece to be ground by the grinding apparatus.

FIG. 7 is a schematic configuration diagram showing a main part of a grinding apparatus that is another embodiment according to the present invention.

[Explanation of symbols]

 W Work Wa Work Through Hole Wb Work Deep Groove 1 Electroplated Grinding Wheel 1a Grinding Wheel Surface of Electroplated Grinding Wheel 2 Adjusting Device 5 Holder Arm 6 Transmission Belt (Power Transmission Means) 10 Moving Stand 12 Adjusting Stick Grinding Wheel 12a Eye Retouching surface of retouching stick grindstone 13 Realignment headstock 14 Drive motor 17 Main spindle 19,21 Transmission pulley 20 Transmission belt

Claims (3)

[Claims] 1. A retouching stick whetstone is pressed against the whetstone surface of an electrodeposition whetstone while rotating about its axis,
A method for refurbishing an electrodeposition grindstone, characterized in that the surface of this grindstone is refurbished. 2. The electrodeposition grindstone is in the form of a disk wheel that is rotatably supported and has an electrodeposition grindstone surface formed on the outer peripheral side surface thereof. On the surface, while rotating the stick grindstone around its axis, by pressing the tip surface, the electrodeposition grindstone is adapted to be rectified while being rotated by the pressing rotational force of the stick grindstone. The dressing method of the electrodeposition grindstone according to claim 1. 3. An apparatus for performing the dressing method for an electrodeposition grindstone according to claim 1 or 2, wherein a dressing stick grindstone has a shaft line of the electrodeposition grindstone on the spindle of the dressing headstock. The spindle is supported so as to be substantially perpendicular to the grindstone surface and rotatably around its axis, and the main shaft is drivingly connected to a rotary drive source, and the stick grindstone and the grindstone surface are relative to each other. A dressing device for an electro-deposition grindstone, which is capable of approaching or separating from an electrode.