JP3197187B2 - Grinding body for online roll grinding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding body for online roll grinding. That is, the present invention relates to a grinding body for an online roll grinding device used by being mounted on a rolling mill.

[0002]

2. Description of the Related Art Conventionally, as a grinding body 01 of an online roll grinding apparatus used by being mounted on a rolling mill, a ring-shaped base metal 02 which is rotationally driven as shown in FIG. What mounts and forms the cup type grinding stone layer 03 is known. Further, this disk-shaped base metal 02 is formed of a thin plate, and the disk-shaped base metal 02 is caused to bend by pressure during grinding, and the surface of the cup-type grindstone layer 03 is brought into contact with the roll surface during grinding. And the like are known (JP-A-6-320431).

[0003]

As shown in FIG. 6, an online roll grinding apparatus 10 is arranged toward a roll 11, reciprocates in the axial direction of the roll 11, and rotates at a high speed while rotating the grinding body. It is provided so as to grind the surface of the roll 11. Also, the axis 10a of the grinding device 10
Is the same height as the axis 11a of the roll 11, or a height shifted up and down by a fixed distance, that is, the offset height H
Further, the axis 10a of the grinding device 10 is provided by being set horizontally inclined by an angle α, for example, 0.5 ° with respect to a line 10b perpendicular to the axis 11a of the roll 11 (hereinafter, referred to as the axis 10a). This inclination angle α is called a grinding stone pressing angle).

[0004] However, in the grinding of the roll 11 by such grinding apparatus 10 is often in total surface width of the grinding layer 03 of the grinding apparatus 10 does not contact the roll surface, the grindstone layer 0
A phenomenon occurs in which the outer peripheral edge or the inner peripheral edge of No. 3 collides with the roll surface. It is considered that the cause is mainly due to the offset error ΔH of the grinding device 10 and the grinding wheel pressing angle angle error Δα.

FIG. 7 is a sectional view showing the offset height H between the roll 11 and the grinding body 01. FIG. 8 shows the state when the roll 11 is ground with the offset height H = 0 or 50 mm in the state of FIG. It is a figure which shows the relationship between the grindstone wear amount (delta) and the grindstone rotation radius r. As an example, the inner diameter of the grindstone layer 03 is 90 mm,
120mm outer diameter, and the width of the grinding layer 03 and 30 mm, as shown in FIG. 8, the grindstone layer 03 is worn inclined by δ from the inner diameter portion substantially linearly to the outer diameter, the offset value H
In the case of = 0 and the case of H = 50 mm, a difference (error) of Δδ is generated in the amount of wear δ.

[0006] On the other hand, the roll 11 of the rolling mill wears the rolled portion of the roll during the rolling operation, causing a level difference on the roll surface. If in order to smooth the roll surface do online roll grinding in the grinding apparatus 10, the diameter of Russia Lumpur 11 slide into gradually decreased. With the offset height H of the grinding device 10 kept constant,
On the other hand, when the gap between the pair of upper and lower work rolls having a reduced diameter is kept constant, the axis 10a of the grinding device 10 and the roll 1 are fixed.
The offset error ΔH with respect to the offset height H of one shaft center 11a increases.

FIG. 9 shows the offset error ΔH and the whetstone layer 0
3 shows the relationship between the wear amount δ and the error Δδ. The increase in the offset error ΔH causes the error Δδ of the wear amount δ of the grindstone layer 03 to increase in proportion to this, and the increased wear amount error Δ
δ causes a phenomenon of one-side contact with the roll surface of the grinding body 01 during online grinding described later.

In FIG. 9, the increase in the error Δδ of the wear amount δ due to the increase in the offset error ΔH is referred to as “amount per piece”.
As shown. Further, FIG. 10 shows a ground body 01 of the grinding 10 pressed against the roll 11 at a whetstone pressing angle α as seen in a plane. The whetstone pressing angle α generates an error Δα due to a chock liner error of a bearing portion (roll chock) that supports the roll 11 and a deformation of a moving support mechanism of the grinding device.

FIG. 11 shows the whetstone pressing angle error Δα,
The relationship between the amount of wear δ of the grindstone layer 03 and the error Δδ is shown. The grindstone pressing angle error Δα is the chock liner error amount (m
m) and the pressing angle error Δ
The error Δδ of the grinding wheel wear amount δ (that is, the amount per side) increases and decreases in proportion to the increase and decrease of α and the chock liner error. When the whetstone pressing angle error Δα is generated on the side where the whetstone pressing angle α set in the grinding device is increased, for example, 0.5 °, the outer one contact of the whetstone layer 04 is demagnetized, and the whetstone pressing angle When it occurs on the side that decreases α, the grinding stone layer 03
To make a half inside.

In online roll grinding, when roll grinding occurs in such a single contact state, the contact width of the grinding wheel changes, the grinding ability changes, and the grinding device is moved at a constant speed in the roll axis direction. Grooving grinding is performed in a spiral shape. In order to avoid this, it is inevitable that the efficiency is reduced and the precision of the grinding is reduced, for example, by adjusting the parallel feed speed of the grinding device 10 to be slow when the one-side grinding occurs.

In the conventional grinding body shown in FIG. 12, when such a one-side collision phenomenon occurs, the grinding wheel layer 03 is deformed by bending deformation of the thin disk-shaped base metal 02 of the grinding body 01 in order to eliminate the one-side contact state. Is intended to be in contact with the roll 11 over the entire width, but nevertheless, as described below, it is not possible to eliminate the problem that the roll grinding is performed in a single contact state. That is, as shown in FIG. 13 (a), the grinding wheel in a state in which the grindstone layer 03 of the grinding body 01 is hit by the outer end piece, in the grinding device 10 is pressed against the roll 11, sheet metal base disk 02 Deflection The outer peripheral end of the layer 03 is pushed back, and the inner end of the grindstone layer 03 approaches the roll 11, and as shown in FIG.
Is in contact with the roll 11.

On the other hand, as shown in FIG. 13 (c), when the grinding device 10 is pressed against the roll 11 in a state where the grinding stone layer 03 of the grinding body 01 is hit against the inner end, FIG.
As shown in the figure, the bending of the thin disk-shaped base metal 02
As a result, the outer end side of the roller 3 is moved in a direction away from the surface of the roll 11, and this inner contact state cannot be eliminated.
The present invention has been made in view of the above prior art,
The main purpose is to surely prevent the occurrence of both the outer side and the inner side of the grindstone layer on the roll.

[0013]

According to the present invention for achieving the above object, an annular grindstone layer is formed on a surface of the disk-shaped base near the periphery, and the wheel-layer mounting part of the disk-shaped base is mounted on the disk-shaped base. , Having a peripheral portion of the disk-shaped base metal as a supporting point and being formed into a flat plate-like shape projecting to the inner circumferential side with a lateral groove-shaped gap between the disk-shaped base metal and the main body thereof, being bent and deformed. It is characterized by.

[0014]

When a grinding body of an online roll grinding device is pressed against a roll surface, and the outer end of the grinding wheel layer comes into contact with the roll surface first, a disk-shaped base body having a lateral groove-shaped gap therebetween. The end side of the part bends and the whole width of the grinding wheel comes into contact with the roll at this point. Conversely, if the inner end of the grinding layer comes into contact with the roll surface first, the outer edge of by the inner side of the grinding wheel layer mounting portion protruding inward support is deformed laterally of the channel gap in the part, the entire grindstone width of this portion is in contact with the roll. Therefore, during the online roll grinding operation, the entire width of the grindstone can always be brought into contact with the roll at the point where the grindstone layer contacts the roll, regardless of the occurrence of the offset error ΔH and the pressing angle error Δα.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

Embodiment 1 Configuration FIG. 1 shows a grinding body for online roll grinding according to a first embodiment of the present invention. As shown in FIG.
It is fixed to the tip of the cylindrical rotary part 3 of the grinding device. The grinding body 1 is composed of a substantially annular disk-shaped base 2 and an annular grindstone layer 5.

The disk-shaped base member 2 is attached to an end portion of the cylindrical rotary portion 3, a main body portion 2 b extending outward, and the main body portion 2 b is continuous with the peripheral edge of the main body portion 2 b as a supporting point. And a flat ring-shaped grindstone layer attaching portion 2c projecting inward with a lateral groove-shaped gap 4 therebetween. The grindstone layer 5 is formed by being mounted on a grindstone layer mounting portion 2c which is a surface portion near the periphery of the disk-shaped base metal 2. Whetstone layer mounting part 2c
The width of the flat ring-shaped portion, and the width and height of the grindstone layer 5 mounted on the grindstone layer mounting portion 2c may be appropriately designed.

Operation and Effect As shown in FIG. 2, when the grinding body 1 is pressed against the roll surface at a grinding wheel pressing angle α, and the outside of the grinding layer 5 comes into contact with the surface of the roll 11 first, the solid line in FIG. After the outer end of the grindstone layer 5 comes into contact with the surface of the roll 11 as shown by, when the grinding body 1 is further pressed, the outer periphery of the main body portion 2b of the disk-shaped base metal 2 is shown by the dashed line in the figure. The side bends and deforms in a downward bending state, and the entire width of the grindstone layer 5 comes into contact with the surface of the roll 11, so that the roll surface grinding of the width of the grindstone layer 5 is performed.

As shown in FIG. 3, when the grinding body 1 is pressed against the roll surface at a grindstone pressing angle α, and the inside of the grindstone layer 5 contacts the surface of the roll 11 first, as shown by a solid line in the drawing. Then, after the inner end of the grindstone layer 5 comes into contact with the surface of the roll 11, when the grinding body 1 is further pressed, as shown by a dashed line in the figure, the inner peripheral end of the flat ring-shaped grindstone layer mounting portion 2c Is deformed by being pushed into the groove-shaped gap 4 downward from the surface of the roll 11, and the entire width of the grindstone layer 5 is
1 is brought into contact with the surface of the roll 1, and the roll surface grinding for the width of the grindstone layer 5 is performed.

Experimental Results FIG. 4 shows the results of performing the above-described roll grinding on the grinding body 1 of this embodiment. FIG. 4 also shows a result of performing the same roll grinding on a conventional grinding body as a comparative example.
In the figure, the abscissa indicates the amount of deflection (μm) after one contact, and the ordinate indicates the eccentric load (kgf) corresponding to the amount of deflection. When the entire width of the grindstone layer 5 comes into contact with the entire width of the grindstone layer 5 and the load value and the amount of deflection until the one-sided elimination, and when the whole width of the grindstone layer 5 comes into contact after the outer end of the grindstone layer 5 comes into contact The load value and the amount of deflection until the one-sided contact is eliminated are shown.

As can be seen from FIG. 4, in the case of the conventional grinding body 01, when the grinding wheel layer hits one side from the outside, the bending deformation of the grinding body leads to full width contact of the grinding wheel layer. When the inner circumference hits one side, no force acts to bring the grindstone layer into full width contact, and the whole width of the grindstone layer cannot be contacted as indicated by the dotted line. On the other hand, in the grinding body 1 of the present embodiment, both when the inside of the grinding stone layer 5 hits one side and when the outside of the grinding stone layer 5 hits one side, the grinding deformation of the grinding body 1 is caused by the subsequent deformation of the grinding stone layer. 5 full width contacts can be achieved.

Second Embodiment Configuration FIG. 5 shows a grinding body for online roll grinding according to a second embodiment of the present invention. As shown in the drawing, in the present embodiment, a flat ring-shaped grindstone mounting portion 2c is attached to the main body portion 2 at the center.
In this configuration, a half of a flat plate-shaped whetstone mounting portion 2c extending inwardly of the grinding body 1 is opposed to the main body 2b with a lateral groove-shaped gap therebetween. Other configurations are the same as those of the above-described embodiment. The width of the flat ring-shaped portion of the grinding wheel layer mounting portion 2c and the width and height of the grinding wheel layer 5 mounted on the grinding wheel mounting portion 2c may be appropriately designed.

In the present embodiment, in the present embodiment, the grinding wheel layer attaching portion 2c is provided at the intermediate portion with the main body portion 2b.
When the grinding body 1 is pressed against the roll 11 at the set pressing angle α, the outer circumference of the grinding wheel layer 5 provided on the grinding wheel layer mounting portion 2c is in contact with the roll 11 at one side. When the inside of the grindstone layer 5 hits the roll 11 one side , the bending deformation of the main body part 2b and the grindstone layer mounting part 2c is as described above.
In the same manner as in the embodiment, the bending of the grindstone layer attaching portion 2c occurs symmetrically with substantially the same eccentric load, and therefore, the grindstone layer 5 acts from a single contact state to a full width contact state with a constant pressing load. Can be done.

[0024]

As described above in detail with reference to the embodiments, according to the present invention, the grinding body of the online roll grinding apparatus is formed by mounting an annular grindstone layer on the surface of the disk-shaped base near the periphery. At the same time, the grinding wheel layer mounting portion of the disk-shaped base metal, with the peripheral edge of the disk-shaped base metal as a supporting point, the inner peripheral side with a lateral groove-shaped gap between the disk-shaped base metal and the main body With the configuration of a flat ring that protrudes into the surface, the occurrence of roll grinding in a one-sided contact state due to the offset error of the grinding device, the grinding wheel pressing error, etc. is reliably and effectively eliminated, and the accuracy and performance of online roll grinding Has the effect of enhancing

[Brief description of the drawings]

FIG. 1 is a sectional view of a grinding body for online roll grinding according to a first embodiment of the present invention.

FIG. 2 is an explanatory view showing a bending deformation in a state of a single outer contact by enlarging a portion II in FIG. 1;

FIG. 3 is an explanatory diagram showing an enlarged portion II in FIG. 1 and showing a bending deformation in a state of an inner side contact.

FIG. 4 is a graph showing a comparison between the results of a roll grinding experiment performed on the ground body of the first embodiment of the present invention and a conventional ground body.

FIG. 5 is a sectional view of a grinding body for online roll grinding according to a second embodiment of the present invention.

FIG. 6 is a schematic perspective view showing a basic function of online roll grinding.

7 is a view taken in the direction of arrows VII-VII in FIG. 6;

FIG. 8 is a graph showing a relationship between a grinding wheel wear amount δ and an offset value H of a grinding device.

FIG. 9 is a graph showing a relationship between an offset error ΔH and an amount of contact Δδ (increase of an error of a wear amount).

FIG. 10 is a horizontal sectional view taken along the line XX in FIG. 6;

FIG. 11 is a graph showing a relationship between a grinding wheel pressing angle error Δα and an amount of contact Δδ.

FIG. 12 is a longitudinal sectional view of a conventional grinding body for online roll grinding.

13 (a) and 13 (b) are cross-sectional views showing a bending deformation of the grinding body when the outer piece hits, and FIGS. 13 (c) and (d) are inner pieces of the conventional grinding body for online roll grinding. It is sectional drawing which shows bending deformation of a grinding body at the time of a hit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grinding body 2 Disc-shaped base 2a Attachment part 2b Main body part 2c Grinding wheel layer attaching part 3 Cylindrical rotating part 4 Groove type gap 5 Grinding stone layer 10 Grinding device 10a Axis 10b Line perpendicular to roll axis 11 Roll 11a Roll axis Center H offset value α Grinding stone pressing angle

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-320431 (JP, A) JP-A-1-301,074 (JP, A) Japanese Utility Model Sho 58-28706 (JP, U) (58) Field (Int. Cl. ⁷ , DB name) B24D 7/00 B21B 28/04

Claims (1)

(57) [Claims] An annular grindstone layer is mounted and formed on a surface of the disk-shaped base near the periphery, and the wheel-layer mounting part of the disk-shaped base has the periphery of the disk-shaped base as a supporting point, A grinding body for online roll grinding, wherein the grinding body is formed into a flat plate-like ring shape projecting inwardly with a lateral groove-shaped gap between itself and a main body of the base metal, and is deformed by bending .