JPH08276362A - Truing electrode for conductive grinding wheel and truing method - Google Patents

Abstract

PURPOSE: To prevent a milling edger and the like from being defectively ground, and efficiently grind them by forming a contact part of the grinding wheel for a truing electrode out of the various kinds of metals such as Ti, Zr and Hf, or out of a plurality of alloys. CONSTITUTION: A grinding body 101 which is formed out of conductive combining material mixed with ultrafine abrasive grains, is provided for the outer circumference of a disc shaped conductor 102 so as to be formed into a conductive grinding wheel 1. A section in contact with the grinding surface of the grinding wheel 1 for a truing electrode 201, is formed out of either one of the various kinds of metals such as Ti, Zr and Hf, or more than two alloys. The aforesaid truing electrode 201 is so held that it can be cut in by a tailstock 401 which is traversely moved over a grinding bed. Both sides of the truing electrode 201 are formed into each tapered part, and grooves 302 are formed in a parallel part between the tapered part. By this constitution, sludge is so designed as to be hardly accumulated, but as to be easily washed out by conductive working solution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a truing electrode for a grindstone and a truing method, and is suitable for finishing the surface of a rolling roll such as steel to a level according to the quality of rolled products.

[0002]

2. Description of the Related Art When dressing a grinding wheel, it is disclosed in Japanese Patent Laid-Open No. 61-4665 and Japanese Patent Laid-Open No. 4665/1994 that it is disclosed that dressing and truing (reshaping) in consideration of an electro-chemical action are performed. There is a publication of 3-196968. In the invention described in the above-mentioned Japanese Patent Laid-Open No. 61-4665, as shown in FIG. 9, a rotating conductive disk grindstone 1 forms a conductive band 2 by a conductive path 5 standing from a conductive ring 4, The conductive strips 2 and the polishing strips 3 are arranged alternately. Then, during the grinding of the workpiece M, a working liquid is caused to flow from the nozzle 8 between the electrode 6 and the grindstone outer peripheral surface to form an energized state, which is generated by the electric power applied from the terminals 9 and 10 of the power source 7. The grinding stone is dressed by electrolysis and discharge. Further, the above-mentioned Japanese Patent Laid-Open No. 3-1
According to the invention described in Japanese Patent No. 96968, as shown in FIG. 10, a disk grindstone 1 is provided with a grindstone 1'bonded with superabrasive grains (CBN, diamond) and has conductivity, and a spindle 2 It is fixed via a flange 3 and is rotationally driven. And the grindstone 1
′ Means that the dress electrode 4 made of a metal having a strong chemical affinity, an alloy containing the metal, or the metal and a non-metal material comes into contact with the outer peripheral surface thereof. The dressing electrode 4 is reciprocated in a direction orthogonal to the rotational movement direction of the disk grindstone 1 by a dressing electrode holding device 5 fixed to a grindstone cover 7 via an insulating plate 6. Power supply 8
Is to apply a voltage such that the whetstone side becomes positive on the time average in a state where the dressing electrode 4 has a conductive machining liquid interposed in the contact portion with the grindstone 1 '. With these configurations, the dressing electrode 4 is brought into contact with the grindstone grinding surface at a predetermined set pressure to cause an electric discharge action, an electrolytic action, and a mechanical action between the dressing electrode 4 and the grindstone grinding surface, and thereby the superabrasive grains (CBN, Diamond) Dressing and truing of a conductive grindstone.

[0003]

However, the above-mentioned JP-A-61-1665 and JP-A-3-1969.
In the invention described in Japanese Patent Publication No. 68, when the dress electrode is reciprocated in a direction simply orthogonal to the movement direction of the grindstone, since the truing device is not provided, the grindstone surface is finished only flat and Truing (reshape)
Takes time, and it is not possible to chamfer both sides of the grindstone,
As a result, both sides of the grindstone hit the object to be ground (contact).
Next, feed marks (uneven grinding) occur. Further, when the truing (reforming) is insufficient during grinding of a roll or the like, unevenness is generated on the surface of the ground roll, and for example, a steel sheet rolled by such a roll significantly impairs commercial value. The present invention solves the above problems,
An object of the present invention is to provide a truing electrode and a truing method capable of efficiently grinding without causing defects when grinding a rolling roll or the like.

[0004]

According to a first aspect of the present invention, there is provided a truing electrode for a conductive grindstone in which a portion of the conductive grindstone in contact with the grinding surface is made of various metals such as Ti, Zr, and Hf, or any two of them. It is characterized by being composed of the above alloys. A second invention according to the present application is a flat surface portion in which a portion in contact with a grinding surface of an electrically conductive grindstone is wider than a grindstone width made of various metals such as Ti, Zr, and Hf or any two or more alloys; And a taper portion extending from both ends of the section at a desired angle. According to a third aspect of the present invention, in a state in which a conductive working fluid is interposed between a conductive grindstone and a truing electrode, both sides of the grindstone can be tapered while a current is passed from the grindstone to the truing electrode, and the grindstone It is characterized in that the ground surface can be trued to obtain a desired protrusion amount of abrasive grains.

[0005]

[Function] The truing electrode that comes into contact with the grindstone of the truing device performs truing of the grindstone before grinding the roll or the like with the conductive grindstone. Ti having a strong chemical affinity for the superabrasive grains constituting the grindstone, It is made of any metal of Zr and Hf or an alloy of two or more of them, and the conductive grindstone can be effectively trued. Further, the truing electrode shape has a width in which the parallel portion is wider than the width of the grindstone, and can truing the grinding surface of the grindstone, and the truing electrode has a part capable of tapering both sides of the grindstone,
Predetermined taper processing can be applied to both sides of the grindstone. Also, with the conductive machining fluid interposed between the conductive grindstone and the truing electrode, a current is passed from the grindstone to taper both sides of the grindstone or truing the parallel part of the grindstone grinding surface. In the method, the working fluid removes the sludge generated by the abrasion of the grindstone or the truing electrode and efficiently cleans the space between the grindstone and the truing electrode, so that the current easily flows and the truing can be performed efficiently. Therefore, chatter marks caused by wobbling of the grindstone due to lack of truing and feed marks due to lack of truing on both sides of the whetstone (lack of taper processing) are eliminated, and a ground surface with excellent surface quality can be obtained.

[0006]

【Example】

Example 1 FIG. 1 is an explanatory diagram showing a main part configuration of one demonstration example to which the present invention is applied. In the figure, reference numeral 1 denotes a conductive grindstone, in which a grinding body 101 formed by mixing a conductive binder with superabrasive grains is provided on the outer periphery of a disc-shaped conductor 102. Reference numeral 201 is a truing electrode, and the portion in contact with the grinding surface of the grindstone 1 is made of various metals such as Ti, Zr, and Hf or any two or more alloys, and can be cut by the tailstock 401 traversing the grinder bed. Is held. As shown in FIG. 2, the truing electrode 201 is fixed to a tailstock 401 via an insulator (acrylic plate) 301, has tapered portions a on both sides, and has a groove 302 on the surface of a parallel portion b. ing. As shown in FIG. 3, the groove 302 is parallel to the surface of the parallel portion b, is carved in the rotating direction of the grindstone 1, has a structure in which sludge is unlikely to accumulate, and is easily washed away by the conductive processing liquid. The truing of the grindstone 1 is performed by the tailstock 4 to which the truing electrode 201 is attached to the grindstone base before grinding.
01, the grinding band 101 is cut into the truing electrode 201 by a predetermined amount, and a working liquid having a predetermined electric conductivity (185 Ω · cm) is supplied from the conductive working liquid nozzle 14 to the grinding band 101. And the truing electrode 201 are sprayed, the grindstone 1 is rotated at a predetermined number of revolutions, and the grindstone head is traversed so that the contact portion of the grindstone 1 with the truing electrode 201 is changed in the width direction to control the current. The tool energizes the stone so that a current flows from the grindstone to the truing electrode. Further, the tapering of both sides of the grindstone 1 is performed at the taper portion a of the truing electrode 201, but the taper amount can be added by a predetermined amount by the traverse amount of the truing electrode of the wheel head. Before grinding the rolling roll as described above, the whetstone 1 is subjected to removal of runout of the whetstone 1 by the truing electrode 201, tapering of both sides of the whetstone, and optimization of the amount of projection of the abrasive grains, and then the rolling roll. Since such grinding can be performed, grinding with excellent surface quality can be efficiently performed from the beginning.

Example 2 After being trued by the truing electrode 201,
As shown in FIG. 4, the grindstone 1 traverses and rolls 13.
Go to the side and start grinding. At that time, as shown in FIG. 5, a dressing electrode control device 4 is provided above the grindstone cover 3, and the dressing of the surface of the grindstone 1 is performed by the flat surface portion of the dressing electrode 2 while grinding, and the taper processing by the taper portion is performed. It is ground while being processed. This dress electrode 2 is shown in FIGS.
As will be apparent from the details of FIG.
As in No. 1, both sides of the grindstone can be tapered. The dressing state of the grindstone 1 can be measured by the grindstone load current under a constant grinding efficiency, but if it is constantly measured and the grindstone load current becomes higher than a predetermined current, it means that the dress is not in good condition. Increase the output (current) of the power supply to increase the dressing efficiency. If the grindstone load current is less than or equal to a predetermined current value, the output (current) of the dressing power supply is set to a predetermined value to prevent excessive dressing.

FIG. 8 is an explanatory diagram showing the system configuration of the dressing device shown in FIGS. In the figure, reference numeral 1 is a grindstone having a disk shape having conductivity, which is formed by mixing superabrasive grains with a conductive binder. 2 is a dress electrode,
The portion of the grindstone that comes into contact with the grinding surface is made of various metals such as Ti, Zr, and Hf or any two or more alloys, and the grindstone 1 is dressed in a direction parallel to its axis. Reference numeral 4 denotes a dressing electrode control device, which holds the dressing electrode 2 so as to be traversable in the direction parallel to the rotation axis of the grindstone 1 (the direction of the arrow in FIG. 7) and to feed the grindstone 1 in the radial direction. It has become. Reference numeral 6 denotes a grindstone motor, which drives the grindstone 1 by belting. Reference numeral 7 is a grindstone motor controller, which rotates the grindstone motor 6 at a speed determined based on dressing conditions, which will be described later, and 8 is a grindstone motor current detector. 9 is a dress power supply. A dressing current controller 11 determines an appropriate dressing current from the detection value obtained by the grindstone motor current detector 8. An energizing brush 12 forms a circuit that contacts the end of the rotating shaft of the grindstone 1 and flows from the dressing power source 9 through the dressing electrode control device 4 to the dressing electrode 2 to the grindstone 1. A rolling roll 13 is used to grind and finish the grindstone 1. Reference numeral 14 denotes a nozzle, which is used to grind the grinding fluid pumped up from the grinding fluid tank 16 and purified by the grinding fluid filtering paper filter 15 in the process of feeding, between the grindstone 1 and the dressing electrode 2 and the grindstone 1. It is supplied between the rolls 13. The used grinding fluid is received by the grinding fluid recovery toy 17 and circulated through the pipe 18.

[0009]

According to the present invention, before grinding, the grindstone is trued in advance to reduce the runout of the grindstone, the both sides of the grindstone are tapered, and the protrusion amount of the abrasive grains is adjusted to a proper state. Since grinding can be performed, chatter due to feed marks and runout is eliminated from the beginning of grinding, and high quality roll expression can be efficiently obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a main part configuration of one demonstration example of a grinding apparatus to which the present invention is applied.

FIG. 2 is a main part explanatory view showing a cross section taken along the line II-II of FIG.

FIG. 3 is a perspective view showing a truing electrode according to the present invention.

FIG. 4 is a schematic perspective view showing an overall configuration of one demonstration example of a grinding apparatus to which the present invention is applied.

FIG. 5 is an explanatory diagram showing a configuration of a grindstone portion of one demonstration example of a grinding apparatus to which the present invention is applied.

6 is an explanatory view of a main part showing a cross section taken along the line VI-VI of FIG.

FIG. 7 is an enlarged sectional view showing a dress electrode according to the present invention.

FIG. 8 is an explanatory diagram showing a system configuration of a dressing device to which the present invention is applied.

FIG. 9 is an explanatory diagram showing an example of a conventional technique.

FIG. 10 is an explanatory diagram showing another embodiment of the conventional technique.

[Explanation of symbols]

 1 Grinding Stone 2 Dressing Electrode 4 Dressing Electrode Control Device 6 Grinding Stone Motor 7 Grinding Stone Motor Controller 8 Grinding Stone Motor Current Detector 9 Power Panel 11 Control Panel 12 Power Supply Brush 13 Rolling Roll 14 Nozzle 101 Grinding Band 102 Disc-shaped Conductor 201 Truing Electrode 401 Tailstock

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiki Manabe 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.

Claims (3)

[Claims] 1. A truing electrode for a conductive grindstone, characterized in that a portion of the grindstone having conductivity which is in contact with the ground surface is made of various metals such as Ti, Zr and Hf or an alloy of any two or more thereof. 2. A flat part having a width wider than the width of the grindstone made of various metals such as Ti, Zr, and Hf or an alloy of any two or more of which is in contact with the grinding surface of the conductive grindstone, and from both ends of the flat part. A truing electrode for a conductive grindstone, comprising a tapered portion that is inclined and extends at a desired angle. 3. A truing process for performing a tapering process on both sides of the grindstone while passing a current from the grindstone to the truing electrode in a state where a conductive working fluid is interposed between the conductive grindstone and the truing electrode. Truing method for conductive grinding stone.