JP2580327B2 - Online roll grinding equipment for rolling mills - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an online roll grinding apparatus for a cross-roll type rolling mill, and relates to an improvement of a grinding apparatus using a cylindrical or bar-shaped grindstone as a grinding body. It is.

[Conventional technology]

In recent years, in hot rolling mills and the like, in order to improve the thickness accuracy in the sheet width direction, and to extend the wear life of the roll,
A pair cross roll type rolling mill is used. This rolling mill crosses respective axes of an upper roll group including an upper work roll and a backup roll thereof and a lower roll group including a lower work roll and a backup roll thereof in a horizontal plane including a rolling direction. Is what you do. However, when the amount of rolling increases, the surface of the work roll in contact with the rolled material is locally worn, and the surface of the roll is roughened by foreign matters or the like that are partially adhered, thereby impairing the quality of the rolled product. For this reason, it is often necessary to replace the spare roll with a new one. However, this replacement requires a great deal of time and labor, and impairs production efficiency. Therefore, as a countermeasure against this, the work roll is rotated with the work roll incorporated in the rolling stand, and the grinding body such as a grindstone is reciprocated in the roll axis direction while being pressed against the roll surface. A variety of so-called on-line roll grinding apparatuses have been proposed, which reduce the frequency of roll replacement by grinding and removing the required roll profile, and some of them have been put to practical use. Here, an online roll grinding apparatus mainly using a so-called cup-shaped grindstone having a cylindrical or rod shape as a grinding body will be described below.

FIG. 4 is a front view including a partial cross section showing an example of an upper work roll grinding apparatus in a conventional pair-cross roll type four-high rolling mill, and FIG. 5 is a view taken along the line VV in FIG. FIG. FIG. 6 is a detailed front view showing the relationship between the upper work roll and the grindstone, and FIG. 7 is a VII-V of FIG.
FIG. Note that the lower work roll is almost vertically symmetrical to that of this figure, and hence only the upper work roll will be described below.

In these figures, (1) is the upper work roll,
(1 ') is a lower work roll, and (2) is an upper backup roll. (3) is the axis (O) of the upper work roll (1).
r) a plurality of grinding bodies (grinding wheels) arranged in a direction,
Each is rotatably supported by the tip of the holder (4), and is housed in the frame (5) so as to be able to freely move in and out in a direction substantially perpendicular to the roll axis (Or). At the rear of the holder (4), a pressing device (not shown) having a cylinder for pressing the grindstone (3) against the roll (1) surface at an arbitrary set pressure is mounted.

As shown in FIGS. 6 and 7, the shape of the grindstone (3) is a cylindrical body (or a rod-like body) having a ring-shaped contact surface with the roll (1), and is a so-called “cup type”. ". The rotation axis (Og) is inclined by an angle (α) (see FIG. 5) in the direction of the roll axis (Or) with respect to the normal to the surface of the roll (1), and the roll axis (Or)
Is shifted upward by an arbitrary set distance (H) (downward in the case of the lower roll (1 ')) (offset).
Furthermore, it is installed downward at an arbitrary angle (β) with respect to the horizontal plane.

Accordingly, when the grindstone (3) is pressed against the rotating roll (1) during grinding, the contact surface of the grindstone (3) with the roll (1) (hereinafter referred to as the grindstone grinding surface or simply the grinding surface)
The roller surface is always in linear contact (m), and the grindstone (3) is rotationally driven by the roll (1). The relative slip speed (Vs) between the peripheral speed (Vg) and the roll peripheral speed (Vr) of the grindstone causes the roll surface to change. Is ground. In this case, the ratio between the grinding wheel speed (Vg) and the relative sliding speed (Vs) is determined to be optimal for the angle (γ) based on the roll peripheral speed (Vr) and the properties (grinding ability and grinding ratio, etc.) of the grinding wheel (3). The tilt angle (α) and the offset amount (H) are set so as to be as follows. Therefore, once the angle (θ) and the inclination (α) are set, the offset amount (H) must always be kept accurately.

On the other hand, the frame (5) has a substantially central lower portion supported on a frame support (7) via a guide rod (6), and can be tilted up and down around the guide rod (6),
It can also slide back and forth parallel to the roll axis (Or). Also, the front part of the frame (5) (roll side, left side in FIG. 4)
Is connected to the rear part (the fourth part) via a push-up device (9) having a spring or the like.
The right side of the figure) is slidably supported on a frame support (7) via a pair of positioning devices (8) such as jacks installed in the roll axis direction. Further, a cylinder (10) provided on a frame support (7) is used as a reciprocating drive mechanism of the frame (5).

The frame support base (7) is supported by pins (13) via a bracket (11) protruding from the rear central portion so as to be horizontally rotatable with respect to the slide frame (12). The slide frame (12) is slidably supported by a pair of guide rails (15) provided on the working side and the drive side of the housing (14), and is mounted on a beam (16) of the housing (14). Via 17), it is possible to take in and out in the direction perpendicular to the roll axis (Or).

On the other hand, a pair of cushions (1) with a built-in spring, for example, are provided at the lower part of the front end of the frame support (7) at positions opposite to the side surfaces of the chocks (18a) (18b) at both ends of the roll (1).
With the cross-following mechanism consisting of 9) arranged, the slide frame (12) is advanced toward the roll (1) by the retract cylinder (17) and pressed against the stopper (15a) at the tip of the guide rail (15). The pair of cushions (1
The grinding surface (m) of the grindstone (3) can be held parallel to the roll axis (Or) by contacting the 9) with the projecting member (20) on the side of each work roll chock (18a) (18b). ,It is configured.

With the above configuration, at the time of roll grinding, the retracting cylinder (17) is advanced to slide frame (12).
By moving along the guide rail (15),
The grinding surface (m) of the grinding wheel (3) automatically follows the variation of the cross angle (θ) of the upper and lower rolls, and is kept parallel to the roll axis (Or). Grinding can be performed while maintaining a predetermined off-seo amount (H) while horizontally rotating integrally with (18b).

On the other hand, it is necessary to match the position (H) of the axis (Og) of the grinding wheel by following the fluctuation of the roll (1) diameter due to the roll grinding or the fluctuation of the roll center (Or) due to the fluctuation of the roll gap. In this case, the positioning device (8)
This can be easily implemented by a combination of the tilting of the grinding wheel (3) by the pressing and the putting in and out of the grinding stone (3) by the pressing device (not shown).

[Problems to be solved by the invention]

The roll cloth means in the conventional rolling mill described above,
The front and rear surfaces of the roll chocks at both ends of the upper and lower roll groups are clamped by jacks (for example, 16 in total) attached to the housing (14), and are opposed to each other in the front and rear direction of the rolling direction (Z). Since the required cross angle (θ) is set by pressing horizontally in the direction, the work roll (1) rotates around the roll drum center (O) (that is, the cross center), and The position shown by the dotted line in FIG.

However, such a cross drive mechanism has a disadvantage that the number of jacks (16) is large, and the cost of equipment is high. Therefore, the inventors of the present invention for cost reduction,
A one-sided cross drive mechanism that reduces the number of jacks from sixteen in the above example to eight has been previously proposed. In this proposal, one of the roll chocks at both ends of the upper / lower roll group is set as a fulcrum (for example, (P) in FIG. 2), and the roll chocks on the opposite sides are driven horizontally via jacks. Is set.

However, in the case of such a one-sided cross mechanism, the fourth
The grinding device illustrated in FIGS. 5 and 5 cannot be used for the following reasons. That is, when the roll (1) is set to an arbitrary cross angle (θ), the roll (1) moves to the position shown by the dotted line in FIG. 2 with the rotation center (P) as a fulcrum, and the roll surface position (solid line position) before crossing. Therefore, the roll body is inclined away from the center of the roll body by a distance (e). Therefore, it is possible to extend the grindstone holder (4) by the stroke (e) and press the grinding surface (m) of the grindstone (3) in parallel with the surface of the roll (1). As shown in FIG. 1, the roll center (Or ') and the grinding surface position (m) have a discrepancy of (S) above and below. When grinding is performed in this state, the grinding wheel (3) is clogged, the grinding efficiency is reduced, and finally grinding becomes impossible.

In order to prevent this, a grinding device should be installed so that the axis (Og) of the grinding wheel or the slide frame (12) can be moved in and out of the roll (1) horizontally. Since a guide (not shown) is installed and it is extremely difficult due to location constraints,
As shown in the figure, the grinding wheel axis (Og) and the guide rail (15) must be mounted with an inclination (β) with respect to the horizontal. In the illustrated example, the mounting angles of the grinding wheel axis (Og) and the guide rail (15) are the same, but they do not always need to be matched.

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above problems, and has as its object to provide an online roll grinding device that can be used in a single-sided cross drive type cross rolling mill.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a frame in which a plurality of holders rotatably supporting a grinding body at the tip are housed in a roll axis direction of a cross-roll type rolling mill, and the frame is parallel to the roll axis. An on-line roll grinding device comprising a frame supporter for supporting the frame supporter so as to be able to reciprocate and tilt in the vertical direction, and a slide frame movably mounted on the frame supporter. An on-line roll grinding apparatus for a rolling mill, characterized in that the frame is connected by an eccentric pin and a cross-following cylinder that operates to follow the cross angle adjustment of the roll.

(Operation)

In the present invention, as described above, since the frame support and the slide frame are connected by the eccentric pin, the rotation of the eccentric pin moves the frame support to the slide frame and at least the rolling direction of the work roll at the time of the roll cross. , And can be horizontally rotated around the eccentric pin. Further, by horizontally moving and horizontally rotating the frame support base in the rolling direction via a cross-following cylinder provided on the slide frame, it is possible to follow the movement of the work roll chock during the roll cross.

As described above, it is possible to automatically follow the set cross angle of the roll in the one-side shift drive system and match the position of the grinding surface of the grindstone with the roll so as to have a predetermined offset amount.

〔Example〕

FIG. 1 is a front view including a partial cross section of one embodiment of the present invention,
FIG. 2 is a schematic plan view taken along the line II-II of FIG.
The figure is a detailed view of the main part of FIG. In these drawings, the same or similar members as those of the conventional device described with reference to FIGS. 4 and 5 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, as shown in the figure, an eccentric pin (2) having an eccentric amount (R) is used as a pin for connecting the frame support (7) and the slide frame (12) in the conventional apparatus.
1) use. In addition, a pair of left and right cross-following cylinders (22) (2
Through 2), the frame support (7) is connected to the slide frame (12) so as to be able to advance and retreat horizontally to the work roll (1) side, and the support shaft (21a) of the eccentric pin (21) is provided. Is configured so as to be horizontally rotatable around. All other configurations are the same as the conventional one.

With the above configuration, when the roll (1) is crossed by an angle (θ) by the one-side cross mechanism (indicated by a dotted line in the figure) and the follower cylinders (22) and (22) are advanced appropriately as shown in FIG. As shown, the eccentric shaft (21a) of the eccentric pin (21) rotates with the eccentric amount (R) as a radius, and the frame support (7) rolls horizontally by the moving amount (e) of the roll axis (Or). As it moves to the side, it horizontally rotates about the axis (21a), and the grinding surface (m) of the grindstone (3) group is pressed in parallel with the roll (1) surface. Therefore, the whetstone (3)
Is set in a state where the axis (Og) is offset by (H) with respect to the roll center (Or ') after crossing. Hereinafter, roll grinding can be performed in the same procedure as the conventional apparatus.

[Effects of the Invention] In the present invention, the eccentric pin is used as a connecting pin for connecting the support frame supporting the grinding wheel and the slide frame supporting the same supporting frame, and the eccentric grinding wheel group is installed by installing the cross-following cylinder. Since the pin can be rotated horizontally around the fulcrum and can be moved horizontally to the roll side with respect to the slide frame, it automatically follows the set cross angle of the roll in the one-side shift drive system, and the position of the grinding surface of the grindstone Can be adjusted to the center of the roll so as to have a predetermined offset amount. Therefore, the apparatus of the present invention has an advantage that it has a very simple structure and can be applied to an existing apparatus at a low cost, and can be used in a rolling mill of any drive system of both cross and single cross.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is an enlarged view of a main part in FIG. 4th
The figure is a front view showing an example of a conventional online roll grinding device of a cross roll rolling mill, and FIG. 5 is a plan view of the same. FIG. 6 is a detailed front view showing the relationship between the upper work roll and the grindstone, and FIG. 7 is a side view of the same. (1) (1 ') ... work roll, (2) ... backup roll, (3) ... grinding body (grinding stone), (4) ... grinding body holder, (5) ... frame, (7) ... frame support, (10) reciprocating drive cylinder, (12) slide frame, (13) connecting pin, (18a), (18b)
… Work roll chock, (19) Cross follow mechanism (cushion), (21) Eccentric pin, (22) Cross follow cylinder, (H) Offset amount, (Og)
Grinding body rotation axis, (Or) ... Work roll axis, (θ)
... cross angle, (D) ... rolling mill drive side, (W) ... rolling mill working side.

Claims (1)

(57) [Claims] 1. A frame comprising a plurality of holders rotatably supporting a grinding body at a tip thereof in a roll axis direction of a cross-roll type rolling mill, and the frame being reciprocally movable parallel to the roll axis and vertically. In an online roll grinding device including a frame support that tiltably supports, and a slide frame that is movably supported by supporting the frame support, the frame support and the slide frame are provided with an eccentric pin and the roll. An on-line roll grinding device for a rolling mill, wherein the on-line roll grinding device is connected to a cross-following cylinder that operates in accordance with the cross-angle adjustment.