JPS591010A - Method and device for grinding rolling roll - Google Patents

Abstract

PURPOSE:To grind a rolling roll on line over a long period of time and in excellent grinding efficiency, by pressing a non-conductor made of ultra-hard material, solidly stuck to the tip of an electrode whetstone, to the rolling roll, and supplying DC current while feeding an electrolyte to a place between the electrode and the roll. CONSTITUTION:In a device for on-line grinding a rolling roll 6 by setting an electrode whetstone 9 to a cathode and the rolling roll 6 to an anode, and feeding an electrolyte 22 to a place between both electrodes; a nonconductor made of ultra-hard material, in which abrasive grains are embedded if necessary, is solidly stuck to the tip of said whetstone 9, and the whetstone 9 is pressed to the roll 6 through said non-conductor by adding a hydraulic pressure 26 to a whetstone pressing device 8 from a pipe 11. Said pressing pressure is set to the degree of 0.5-6kg/cm<2>, and the distance between the whetstone 9 and the roll 6 is maintained within the range of 0.2-0.4mm.. Further, a sticking of spattered electrolyte 22 to a material 5 to be rolled is prevented, and at the same time, the electrolyte is enabled to circulate by storing it, by providing holding plates 12, 13.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling roll grinding method and apparatus, and in particular,
The present invention relates to a rolling roll online grinding method and apparatus suitable for grinding rolls online.

Examples of conventional rolling roll online grinding methods are shown in FIGS. 1 and 2. In Figure 1, roll 1
This is a method of grinding by pressing a whetstone 2 against the surface of the surface using water pressure such as water 3. However, this method requires large-scale equipment that can sufficiently withstand the grinding reaction force against the grinding wheel 2, and since it is not possible to use a large-diameter grinding wheel unlike online grinding, it is consumable and has a short lifespan. There were some drawbacks that made it unsuitable.

Furthermore, it is difficult to set the amount of grinding depth, and there are also drawbacks such as poor grinding efficiency for materials with hard surfaces such as rolls.

FIG. 2 shows a method of grinding by driving the rotary grindstone 4 by the necessary amount against the roll l. However, even in this method, since the grinding wheel 4 is pressed against the surface of the roll 1 for grinding, the rotating grinding wheel 4 quickly becomes clogged, and it is difficult to discharge the grinding powder. Yanagi with a hard charcoal surface like No. 1 had drawbacks such as poor grinding efficiency.

Therefore, in order to overcome the drawbacks of the conventional pure mechanical grinding method, which involves pressing a grindstone against the surface of a rolling roll with a large force or grinding with a certain amount of thrust, electrolytic grinding, which has recently been put into practical use, has been applied to the surface of a rolling mill roll. Attempts have been made to apply it to online grinding. This is a method in which the rolling roll is used as one electrode, the grindstone is used as the other electrode, and an electrolytic solution is flowed between the electrodes to elute and grind the metal from the rolling roll according to Faraday's law. However, even in this method, there is a drawback that the distance between the electrodes constituted by the rolling roll and the grindstone is set far apart.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus for grinding a mill roll, which eliminates the above-mentioned drawbacks and enables online grinding with long life and high grinding efficiency.

In the present invention, a rolling roll is used as an anode, an electrode grinding wheel having a non-conductor made of a superhard material fixed to the tip is used as an electrode, an electrolyte is supplied between the rolling roll and the electrode grinding wheel, and the electrolyte is passed through the electrode to both electrodes. The above object is achieved by applying an electric current between the two and pressing a non-conductor onto the roll to grind the roll using mainly electrolytic action and secondary mechanical grinding.

In the present invention, in order to reliably set the distance between the two poles,
A nonconductor is provided on the electrode grinding wheel surface facing the rolling roll surface,
This non-conductor is applied to the surface of the rolling roll using an electrode grinding wheel of 0.5 to 6K.
The light pressing at t/α2 is performed using force.

At this time, if the nonconductor is embedded with abrasive grains, for example, the grinding will be mechanical grinding plus electrolytic grinding. However, in this case, the purpose of providing the nonconductor may be to secure the distance between the two electrodes, but since the force of pressing the electrode grindstone against the surface of the fourth layer is small as mentioned above, more than 60% of the grinding is done by electrolytic grinding. It will be done. Therefore, in the present invention, there is no need to worry about clogging, and since the grinding is performed mainly by electrolytic action, there is no effect of the hardness of the material to be ground, and processing efficiency is high even with highly hard materials such as rolling rolls. Nothing seems to get worse.

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

FIG. 2 is an explanatory diagram showing one embodiment of the method and apparatus for grinding a mill roll of the present invention. The rolled material 5 is rolled by a pair of rolling rolls 6 arranged opposite to each other, and the rolling rolls 6 are supported by a backup roll 7. An electrode grindstone 9 mounted on an electrode grindstone pressing device 8 is arranged adjacent to the rolling roll 6. For pressing the electrode grindstone, a pipe 10 for sending an electrolytic solution is connected to the rear end of the device 8, and a pipe 11 for sending a liquid such as water to press the electrode grindstone 9 is connected to the side surface. The electrode grindstone pressing device 8 is fixed to a holding plate 12. The electrolyte pressing device 8, which is disposed close to the lower rolling roll 6, has a holding plate 13 attached to its lower side surface for preventing the electrolyte from flowing out. FIG. 3 is a detailed diagram of the electrode grindstone 9 shown in FIG.
A nonconductor 14 is provided at the tip of the electrode grindstone 9, and the distance between the electrode grindstone 9 and the rolling roll 6 is 0. z~0.4ttm
is maintained.

FIG. 4 is an explanatory diagram showing the overall configuration of the rolling roll grinding device shown in FIG. 2. The rolling roll 6 is connected to the anode of the power source 15, and the electrode grindstone 9 is connected to the negative electrode of the power source 15. A pipe 10 through which the electrolyte is sent is connected to an electrolyte supply device 16. This electrolyte supply device 16 includes
Pressure gauge 17° flow meter 1B, pressure flow regulator 19. A switching valve 20 and a pump 21 are provided, and the suction side of the pump 21 is connected to a storage tank 23 in which an electrolytic solution 22 is stored. The electrolytic solution used for grinding the rolling rolls 6 flows back into the storage tank 23 through a pipe 24. A pipe 11 through which a liquid such as water is sent is connected to a liquid supply device 25, and a liquid 26 is supplied to the tip of the electrode grindstone 9. Reference numeral 27 is a pressure reducing valve that adjusts the pressure of the liquid 26 to adjust the force with which the electrode grindstone 9 is pressed against the rolling roll 6.

Next, the operation of this embodiment will be explained. The electrode grindstone 9t is brought close to the rotating rolling roll 6, and at this time the electrode grindstone 9 is pressed against the rolling roll 6 by the liquid 26 from the liquid supply device 25. At the same time, the electrolytic solution supply device 16 supplies the electrolytic solution 22 from the tip of the electrode grindstone 9 . When electricity is applied between the rolling roll 6 and the electrode grinding wheel 9 in such a state, the metal constituting the rolling roll 6 is eluted according to Faraday's law, and the rolling roll 6 is electrolytically ground and the metal provided at the tip of the electrode grinding wheel 9 is eluted. Since the nonconductor 14 is embedded with abrasive grains, it is pressed against the surface of the rolling roll 60, and mechanical grinding of the rolling roll 6 is also performed at the same time, albeit slightly. The electrolytic solution 22 is applied to the rolled material 5 by the pressing plate 12.
Also, press the presser plates 12 and 13.
A pool of stain removal solution 22 is formed and returned to the storage tank 23 via 24 feet of piping for reuse. In addition, if Mt - Durham atomic weight of the material to be ground, It - current, t'l1l hour (minute), nt - valence of the material to be ground, Ft - Faraday's constant, and ri is the current efficiency, It Machining amount m = □×η (1) There is a relationship of p, and the processing amount m can be easily controlled by the current ■ and the time t.

According to this embodiment, the rolling roll 6 is used as an anode, and the electrode grindstone 9
is used as a cathode, and the electrolytic solution 22 is flowed between these electrodes to electrolytically grind the rolling roll 6 (60% or more). At the same time, mechanical grinding is also performed using the abrasive grains of the nonconductor 14 at the tip of the electrolytic grinding wheel 9. There is almost no surface scratching, which has the effect of extending the life of the υ grinding wheel.Also, since the metal forming the rolling roll 6 is eluted according to Faraday's law and electrolytically ground, it is not affected by the hardness of the roll. This has the effect of significantly improving processing efficiency. Note that machining efficiency is improved by 50% compared to conventional mechanical grinding alone. In addition, as shown in equation (1), the amount of machining can be easily controlled by current and time, which has the effect of improving the machining surface accuracy of the rolling roll 6 (20% improvement over mechanical grinding). , it is possible to grind the roll 6 while it is being rolled or in the rolling state while the roll 6 is installed in the stand of the rolling mill, it improves the quality of rolled products, reduces the number of roll changes, and schedule-free rolling. It has the effect of making it possible. Furthermore, since a nonconductor with embedded abrasive grains is provided at the tip of the electrolytic grinding wheel 9, the distance between the surface of the rolling roll 6 and the electrolytic grinding wheel 9 can be secured, which has the effect of eliminating the need for automatic pole gap control like electrolytic polishing. be.

As described above, according to the method and apparatus for grinding a mill roll of the present invention, a mill roll can be ground online with long life and high grinding efficiency.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an example of a method for grinding rolls of a conventional rolling mill, Fig. 2 is an explanatory diagram showing another example of a method of grinding rolls of a conventional rolling mill, and Fig. 3 is an explanatory diagram showing an example of a method of grinding rolls of a conventional rolling mill. 4 is a detailed explanatory diagram of the electrode grindstone portion of FIG. 3, and FIG. 5 is an example of the overall configuration of the embodiment shown in FIG. 3. FIG. 6... Rolling roll, i... Electrode grindstone pressing device, 9
...electrode grindstone, 12.13...pressing plate, 14...
Nonconductor, 15... Power supply, 16... Electrolyte supply device,
23...Storage tank, 24...Piping, 25...Liquid supply device. Figure 1

Claims (1)

[Claims] 1. An electrode grindstone disposed opposite to the roll surface of a rolling mill;
a device for pressing the electrode grindstone against the surface of the roll, and a device for grinding the roll by flowing a direct current between the roll and the grindstone while supplying an electrolyte between the roll and the electrode grindstone. The roll grinding method is characterized in that a nonconductor made of a superhard material is fixed to the surface of the electrode grindstone facing the roll surface, and the roll is ground by pressing this nonconductor against the roll surface with a predetermined pressure. Grinding method for rolling rolls. 2. An electrode grindstone placed opposite to the roll surface of the rolling mill;
This pressing of the electrode grinding wheel against the surface of the roll involves a device, an electrolyte supply device that supplies an electrolyte between the roll and the electrode grinding wheel, and a direct current flowing between the roll and the electrode grinding wheel. In a rolling roll grinding device having a power supply device, the pressing device is configured to cover a nonconductor made of a superhard material fixed to the roll facing surface of the electrode and stone, and a tip of the electrode grindstone to be mounted. A grinding device for a rolling roll, comprising: a presser plate attached to the presser plate; and piping for returning the electrolyte stored by the presser plate to the electrolyte supply device.