JPS5946688B2 - Roll grinding device in rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION 1. The present invention relates to a roll grinding device for a rolling mill.

In rolling, for example hot tandem rolling, especially hot strip finishing tandem rolling, the central surface part (threading part) of the work rolls that the material to be rolled passes through and comes into contact with during threading wears out. Until the rolls are changed, the sheet passing order is set to a wide rod (10 rods is a collection of 5 to 6 rolled materials of the same width at a time).

) to rods with narrower widths, the effect on the product shape (shape of the center elongation of the plate crown, edge elongation, etc.) due to wear of the rolls is suppressed as much as possible. In this way, when changing the threading order from wide width to narrow width, it is necessary to arrange the rolled materials in advance in order of width, which improves production efficiency in terms of connection with previous and previous processes. This is a very large constraint.

In particular, hot rolling equipment (e.g. heating furnace or rough rolling equipment) without cooling the blooming rolled steel billet or continuous casting billet.
In the case of direct rolling, if you try to feed the material in the order of width loft, you will not only be severely restricted in the steelmaking, blooming, and continuous casting processes, but also limit the amount of material to be rolled that can be rolled before the next roll change. There is also the disadvantage that the number of books decreases. In order to eliminate such disadvantages, Japanese Patent Application Laid-Open No. 553-58951 discloses that the rotating surface of a hot rolling work roll mounted on a rolling stand has a length that is much shorter than the length of the roll extending in the direction of the outer circumferential generatrix of this roll. Grinding is carried out in a timely manner by reciprocating cross-feeding in the direction of the generatrix while pressing a bar-shaped grinding tool, and the step that grows as the sheet passes is constantly removed mainly at the boundary between the rolling non-operating area near both ends of the roll and the center area of the roll. A method of treating the surface of a hot rolling work roll is provided to allow for removal and width schedule reduction.

According to this method, a rod-shaped grinding tool that is much shorter than the roll surface is fed back and forth, so it has the disadvantage of low grinding efficiency. On the other hand, the applicant has filed a patent application for patent application No. 53-178.
In No. 2, when rolling the material to be rolled in a tandel mill with an online crown meter installed on the exit side of the final stand in a random order in terms of width, the upper and lower work rolls can be placed at any position in the length direction of the upper and lower work rolls by any amount for each stand. Equipped with an online roll polishing device, each time the rolled material is finished rolling,
Predictively polishes the non-threaded parts of the rolled material on the upper and lower work rolls of each stand, and also conducts the threading of the rolled material on the underground work rolls of each stand based on the plate crown signal of the rolled material from the online crown meter. We proposed a tandem mill online roll polishing method for corrective polishing of the plate. The present invention grinds the work roll so as to eliminate the level difference between the threaded part and the non-threaded part of the rolled material formed on the rolling mill work roll every time the material to be rolled is rolled. By maintaining the roll surface (profile) that is close to the one immediately after changing, it removes the constraint of having to roll in order of width, expands the degree of freedom in the rolling order (unifies the width schedule), and improves the roll profile for the next roll. In order to improve the work efficiency by increasing the number of rolled materials before replacement, for example, we will improve the roll grinding equipment of the rolling mill that implements the above-mentioned roll grinding method. To provide a roll grinding device which has the following characteristics: there is no joint mark of the grinding body on the surface of the subsequent roll, the roll roughness after grinding is good, and the grinding body can be replaced very easily.

That is, the gist of the device of the present invention is as follows.

The first gist of the present invention is to attach a grinding body holder to a frame, which is equipped with a grinding body at the tip and has a pressing mechanism at the rear that presses the grinding body against the roll surface of a rolling mill with an arbitrary pressure. In this frame, multiple units are arranged in the axial direction.
The reason is that the roll axial direction reciprocating drive mechanism is connected.
In other words, by using a plurality of grinding bodies and swinging the grinding bodies in the direction of the roll axis, the grinding body grains and metal grains can be easily discharged from the grinding body pressing surface, improving grinding efficiency, and the plurality of grinding bodies can be arranged. Even if the grinding body is ground, no seam marks will be produced on the grinding body. The gist of the second invention is
A liquid supply device which employs a grinding wheel as the grinding body according to the first aspect of the invention, and supplies liquid to the vicinity of the roll pressing surface of the group of grinding wheels in order to further facilitate the discharge of the grinding wheel grains and metal particles from the grinding wheel pressing surface. This is due to the fact that it was deployed.

The gist of the third invention is that a grindstone is mounted at the tip, and a liquid supply hole is provided at the rear, and this hole is equipped with a piping system connected to a liquid pressure source via a pressure regulating valve, an on/off valve, etc. A plurality of grindstone holder boxes are arranged in the roll axis direction on a frame, each forming a pressure chamber that presses the grindstone against the roll surface of the rolling mill at an arbitrary pressure using the pressure regulating valve and for an arbitrary time using the on-off valve. a flexible seal member connected to the roll axial reciprocating drive mechanism and having a ventilation hole at the edge within the pressure chamber of each holder box;
The edge portion is slidably filled with liquid along the inner surface of the box, so that the liquid is sprayed from between the inner circumferential surface of the box and the outer circumferential surface of the grindstone.

As a result, the functions of the grindstone pressing mechanism and the liquid supply device according to the second aspect of the invention are held in the holder box, and the device is simplified and the discharge of the grindstone grains and metal particles is promoted in the same manner as described above. This improves grinding efficiency.

An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 3.

Fig. 1 is an example of the overall planar configuration of a roll grinding device placed close to the work roll of one rolling stand in a tandem mill, Fig. 2 is a view taken along the XX line in Fig. 1, and Fig. 3 shows a YY cross-sectional view of FIG.

The roll grinding device 17 of the rolling mill is equipped with a grindstone 2 at its tip,
It also has a water supply hole 18 at the rear end, and a water pressure header 1 is connected to this hole 18 via a pressure regulator 12 and an on/off solenoid valve 13.
5, a water pressure chamber 4 is formed in which the grindstone 2 is pressed against the surface of the work roll 1 of the rolling mill at an arbitrary pressure by the regulator 12 and for an arbitrary time by the on-off valve 13. The reciprocating drive mechanism 19 is connected to a plurality of frames 7 arranged in the roll axis direction so that the grinding wheel holder box 3 is not generated between the pressing surfaces of the grinding wheels 2 mounted on the box 3. can swing back and forth along the guide frame 8 in the roll axis direction. In this embodiment, the holder boxes 3 are placed on the frame 7 in a staggered manner in two stages, as shown in FIG. It is placed.

The reciprocating drive mechanism 19 is composed of a reciprocating length variable crank 9 attached to the rotating shaft of the drive motor 11 and a connecting rod 16 that connects the end of the frame 7 with a pin, and connects the rotational movement of the crank 9. This is converted into a reciprocating motion of the frame 7 in the longitudinal direction of the roll via the rod 16. Note that 10 is a reciprocating length adjusting screw for adjusting the distance from the crank rotation axis to the pin of the connecting rod 16, and adjusting the reciprocating length.

Since the present invention is equipped with the reciprocating drive mechanism 19, the arrangement of the three groups of holder boxes on the frame 7 can be changed, for example, by arranging the holder boxes 3 in parallel at the lower stage to create a dead space between the pressing surfaces of the grindstone groups. By adjusting the amount of reciprocating motion, it is possible to prevent any joint marks between the grinding wheels from remaining on the roll surface.

1 (In this embodiment, as shown in FIG. 3, in the water pressure chamber 4 of the holder box 3, there is a flexible seal body 5 (specifically, a sponge or a small A rubber packing (eg, a rubber gasket with holes) is installed so that its edge is slidable along the inner circumferential surface of the box 3 by the water supplied into the water pressure chamber 4, and the inner circumferential surface of the waste 3 is fitted. Cleaning water 6 is sprayed from a gap with the outer peripheral surface of the grindstone.

The frame 8 and the drive mechanism 19 are provided on the rolling mill housing or on a support provided independently of the housing such that the two groups of grindstones face the roll surface along the roll axis.

A method of using the roll grinding device 17 of the present invention constructed as described above will be described.

4. Determine the grinding position of the work roll 1 in the axial direction.

2. Determine the two groups of grindstones corresponding to this grinding position, and determine the grindstone pressing force and pressing time according to the required roll grinding amount and work roll rotation speed by each grindstone 2.

) Drive the motor 11 to reciprocate the frame 7 by a predetermined amount in the roll axis direction.

) Adjust the pressure using each pressure regulator 12 of the group of grindstones to be pressed so that the above-mentioned predetermined pressure is obtained, and then turn on the on/off valves 13 of each grindstone at the same time.

As a result, the grindstone group to be pressed is pressed against the rotating work roll surface while reciprocating in the roll axis direction.
In general, in the method of polishing by pressing a grindstone divided in the longitudinal direction of the roll against the surface of a rotating roll, abrasive grains and metal particles generated during polishing accumulate between the roll and the grindstone, resulting in a reduction in the amount of polishing per unit time. However, in the present invention, the divided grinding body, that is, the grinding wheel, is pressed against the roll surface and reciprocated in the roll axis direction. So,
The abrasive grains and metal particles are easily discharged from the contact surface between the grindstone and the roll, effectively preventing a decrease in polishing ability and a deterioration in the surface roughness of the finished roll.

Furthermore, in this embodiment, a flexible seal body 5 having a water passage hole at the edge is placed in the water pressure chamber 4 of the whetstone holder box 3 with the whetstone 2 loosely attached to the tip thereof. Since the interior is slidable by the water supplied into the water pressure chamber, when the on-off valve 13 is turned on, water whose pressure is controlled by the pressure regulator 12 flows into the water pressure chamber 4 from the supply hole 18. When filled, the cross-sectional area of the grinding wheel Sm2 x water pressure Pkg/
With a force of M2=SPkg, the grindstone 2 is pushed forward and pressed against the surface of the rotating work roll 1 while reciprocating in the roll axis direction.

Further, part of the water in the water pressure chamber 4 passes through the ventilation hole of the seal body 5, and the cleaning water 6 is ejected forward along the gap between the outer circumferential surface of the grindstone and the inner circumferential surface of the box. This jetted cleaning water 6 cleans the surface of the rolls between the upper or lower grinding wheels, which changes due to the reciprocating movement, and also comes into pressure contact with the roll surface and cleans the pressing surface of the grinding wheels that are reciprocating. The abrasive grains and metal grains can be washed out and completely prevented from deteriorating the grinding ability and the finished roll surface roughness.

5. After the predetermined pressing time has elapsed, the grindstones that are turned on all at once turn off the valves 13 to stop pressing and stop spouting cleaning water.

By the operations 1 to 5 above, any roll surface position of the work roll 1 in the roll axis direction is ground by an arbitrary amount.

Note that as the grinding wheel wears down through repeated grinding, its length gradually becomes shorter, but when it is pressed against the roll surface, for example, the frame 7 can be freely attached to the frame 8 before the rear end of the grinding wheel comes off from the holder. Alternatively, the entire frame 7 may be replaced without being freely connectable to the reciprocating drive mechanism 19.

In one embodiment of the roll grinding device of the present invention detailed above,
(1) A seal having a water pressure chamber and a small hole in the holder box in which the grinding wheel is mounted, in order to have both the pressing function of the grinding wheel's pressing mechanism and the supply function of the water supply device near the roll contact surface of the grinding wheel. Although the body is housed inside the box, the pressing device and the water supply device may be provided independently.

In this case, various types of pressing mechanisms and feeding devices can be employed. (2) Also, although water is used as the cleaning liquid, other useful liquids can also be used, and as the grinding body, something other than a grindstone can be used. Most preferred.

(3) A reciprocating mechanism in the roll axis direction using a crank is used, but other methods may also be used.

[Brief Description of the Drawings] All the drawings show one embodiment of the apparatus of the present invention, and FIG. 1 is a plan view of the roll grinding apparatus. An example of the overall configuration, Figure 2 is the X-
The X-ray arrow view, and FIG. 3 is a Y--Y sectional view of FIG. 1...Work roll, 2...Whetstone, 3
...Holder box, 4...Water pressure chamber, 5...Seal body, 6...Washing water, 7
...Frame, 8...Guide frame, 9...Crank, 10...Screw, 1
1... Motor, 12... Pressure regulator, 13... On/off valve, 14... Piping system, 15... Water pressure header. , 16...
Connecting rod, 17...Roll grinding device, 18...
... Water supply hole, 19 ... Reciprocating drive device.

Claims (1)

[Scope of Claims] 1. A plurality of grinding body holders are arranged in a frame in the roll axis direction, each having a grinding body attached to the tip and a pressing mechanism at the rear that presses the grinding body against the roll surface of a rolling mill with an arbitrary pressure. , a roll grinding device in a rolling mill, in which a roll axial reciprocating drive mechanism is connected to the frame. 2. A plurality of grindstone holders are arranged in the roll axis direction on a frame, each having a grindstone attached to the tip and a pressing mechanism at the rear that presses the grindstone against the roll surface of the rolling mill with an arbitrary pressure. A roll grinding device for a rolling mill, which connects the mechanisms and is equipped with a liquid supply device that supplies liquid to the vicinity of the roll pressing surface of the group of grindstones in order to remove abrasive grains and metal grains on the roll surface. 3 A grindstone is installed at the tip, and a liquid supply hole is provided at the rear, and this hole is equipped with a piping system that connects to a liquid pressure source via a pressure adjustment valve, an on-off valve, etc. A plurality of grindstone holder boxes each forming a pressure chamber that presses the above-mentioned grindstone against the roll surface of the rolling mill using an on-off valve are arranged in the roll axis direction in a frame, and a roll axis direction reciprocating drive mechanism is attached to this frame. Along with connecting,
A flexible seal having a liquid passage hole at the edge is installed in the pressure chamber of each holder box so that the edge can slide freely by liquid along the inner surface of the box, and the inner circumferential surface of the box and the outer circumferential surface of the grinding wheel are connected to each other. A roll grinding device for a rolling mill that allows liquid to be ejected from between.