JP2956954B2 - Mill roll wiper device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mill roll wiper device. In order to produce a stainless steel plate having a smooth surface and good gloss, a skin pass mill is installed on the outlet side of the continuous annealing and pickling equipment. In this skin pass mill, the surface properties of the mill roll are important for temper rolling of a chromium-based stainless steel sheet whose surface gloss is particularly important. In other words, if scale adheres to the surface of the mill roll, the surface quality of the stainless steel plate deteriorates. Therefore, it is necessary to grind the surface of the mill roll and to always maintain the mirror surface. The present invention thus relates to a wiper device for keeping the surface of the mill roll mirror-finished.

[0002]

2. Description of the Related Art As a conventional mill roll wiper device, there is one disclosed in Japanese Patent Application Laid-Open No. 4-162903. This conventional apparatus is intended to intermittently or continuously grind a mill roll during skin pass rolling in-line, and is configured as follows. Figure 9
The pressing frame 101 is capable of moving forward and backward with respect to the mill roll 102, and a moving base 111 provided on the pressing frame 101 and capable of reciprocating in the mill roll axial direction.
And a pressing roll 116 provided on the moving base 111.
And a polishing unit including a rewind shaft 125 and a take-up shaft 130 for supplying a polishing sheet 135 to the pressing roll 116, and a forward / backward / pressing cylinder 106 for moving the polishing unit back and forth and pressing against the mill roll 102. It is configured. In the state shown in the figure, the forward / backward / pressing cylinder 106 is extended,
While the polishing operation is being performed by pressing the polishing sheet 135 of the polishing unit against the mill roll, when the forward / backward / pressing cylinder 106 is contracted as indicated by the dotted arrow, the polishing unit also retracts as indicated by the dotted arrow. In the illustrated use state, the polishing sheet 135 is sometimes moved between the rewind shaft 125 and the take-up shaft 130, and the moving base 111 is moved to the reciprocating cylinder 11.
If the pressing roll 116 is pressed against the mill roll 102 while moving in the axial direction of the mill roll 102 in step 3, the surface of the mill roll 102 is polished in-line.

[0003]

However, the conventional example has the following disadvantages. When moving the polishing unit from the retracted position to the use position
The polishing unit is rotated at 106, but when the polishing unit rotates around the axis of the fulcrum 105 and the pressing roll 116 comes into contact with the surface of the mill roll, an impact is likely to occur due to the dynamic inertia of the polishing unit. Is transferred to the surface of the mill roll, and the mill roll is damaged. The pressing roll 116 is pressed against the mill roll 102 by the forward / backward / pressing cylinder 106. Since the forward / backward / pressing cylinder 106 is a cylinder having a large output necessary for rotating the polishing unit, polishing and wiping are performed. However, there is a problem in that the pressing is performed with a force larger than the pressing force necessary for the above, and the surface of the mill roll is rather roughened.

The present invention has been made in view of the above circumstances, and provides a wiper device capable of contacting a surface of a mill roll without damaging the same and pressing the pressing roll against the mill roll with a small pressing force during polishing to improve the surface properties of the strip. With the goal.

[0005]

According to the present invention, there is provided a wiper apparatus comprising: a pressing frame; a moving base mounted on the pressing frame so as to reciprocate along a mill roll axis direction; and a pressing roll mounted on the moving base. And a rewind shaft and a take-up shaft pivotally supported on the moving base on both sides of the pressing roll, wound on both ends of the rewind shaft and the take-up shaft,
The wiping unit, which is composed of a wiping sheet wound around the pressing roll and sheet feeding means for feeding the wiping sheet in the middle thereof, and a wiping sheet wound around the pressing roll. A high-output opening / closing actuator for moving between a work preparation position immediately before contact with a mill roll and a retracted position where the pressing roll is separated from the mill roll; and winding the pressing roll from the work preparation position to the pressing roll. over its dependent wiping sheet Ri is Do and a pressing actuator of small output for pressing into a working position pressed against the mill roll surface, the open-close actuator
This is an open / close cylinder.
The bracket of the pressing frame is inserted into the slot formed in the Levis.
The pin passed through the socket is loosely fitted and the clevis
Between the bottom and the support bracket of the pressing roll,
It is characterized by having a pressing actuator interposed .

In the present invention, the fact that the opening / closing actuator has a large output means the relative meaning that the output is larger than that of the pressing actuator, and its absolute value depends on the weight of the wiping unit and the locus of the opening / closing operation. It is what is optimally required. The small output of the pressing actuator means that the output does not exceed the pressing force of the pressing roll (for example, 100 kgf or less) that is optimal for wiping, and as a result, the output is considerably smaller than the output of the opening and closing actuator. Means

[0007]

In order to move the wiping unit from the retracted position to the work position in the first aspect of the invention, first, the wiping unit is moved from the retracted position to the work preparation position by a high-output opening / closing actuator. Since this movement is performed by a large output opening / closing actuator, the movement can be performed quickly, and since the pressing roll is just before coming into contact with the mill roll, it does not collide with the mill roll due to the dynamic inertia of the wiping unit and does not damage the mill roll. Then, into contact with the mill roll surfaces and press the pressing roll pressing actuator of small output. At this time, the pressing force of the pressing roll is weak, so that even if the wiping sheet is pressed by the mill roll, the surface of the mill roll is not damaged. And
The weight of the wiping unit must be such that the pin hits the bottom of the slot
To the small pressing actuator.
The last force is not applied and the damage is diverted.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings. Note that the upper and lower wiper devices of the present invention are provided with a material pass line as a boundary, and their configurations are substantially the same. Therefore, the lower wiper device will be described below. FIG. 1 is a side view of a wiper device according to an embodiment of the present invention, in which a large X portion is an enlarged view of a small x portion,
FIG. 2 is a rear view of the wiper device. 1 and 2, R is a mill roll and A is a wiping unit. The configuration of the wiping unit A may be any as long as it has a function of polishing or wiping the surface of the mill roll R, and there is no particular restriction on the configuration. In this embodiment, the configuration is as follows. First, an outline is described. Reference numeral 1 denotes a pressing frame, which is connected to a swing shaft 3 by an arm 2 so as to swing in the direction of arrow a.
On the upper surface of the pressing frame 1, a moving base 4 is provided with a mill roll R.
It is mounted so as to be able to reciprocate along the axial direction of. A pressing roll 5 is mounted on the upper surface of the movable base 4, and a rewinding shaft 6 and a winding shaft 7 are provided on both sides thereof. The wiping sheet 8 has one end wound around the rewinding shaft 6, the other end wound around the winding shaft 7, and the middle thereof being wound around the upper surface of the pressing roll 5. As will be described later in detail, when the reciprocating movement of the moving base 4 and the feeding of the wiping sheet 8 are repeated, the wiping sheet 8 is brought into contact with the surface of the rotating mill roll R so that polishing and wiping can be performed.

An opening / closing cylinder 10 corresponding to the opening / closing actuator described in the claims is mounted on the back surface of the pressing frame 1. The opening / closing cylinder 10 is constituted by a hydraulic cylinder having a large output sufficient to support the weight of the wiping unit A and perform a swing operation, and swings the wiping unit A between a work preparation position II and a retreat position III. For this purpose, the opening / closing cylinder 10 is swingably supported by a trunnion 11, and the rod 12 is connected to the pressing frame 1 by a clevis 20. As shown in the enlarged view X of FIG. 1, the clevis 20 has a long hole 21 formed therein and a small output pressing cylinder 30 incorporated therein. Note that this pressing cylinder
Reference numeral 30 corresponds to a pressing actuator referred to in the claims.

Next, the assembly structure of the pressing cylinder 30 will be described with reference to FIGS. FIG. 3 is a plan view of the clevis 20 and FIG. 4 is a longitudinal sectional view of the same. A long hole 21 is formed at the tip of the clevis 20, and a pin 14 passed through the bracket 13 of the pressing frame 1 is loosely fitted. This pin 14 is movable within the long axis interval d of the long hole 21. On the other hand, a small pressing cylinder 30 is attached to the bottom of the clevis 20, and its rod 31 comes into contact with the bracket 13. A linear ball bearing 32 is externally mounted on the rod 31, and a guide rod mounted on the clevis 20 is provided.
It guides through the inside of the tube 22 so as not to cause a failure such as buckling due to a reaction force applied to the rod 31.

By the pressing cylinder 30 having the above structure, FIG.
The wiping unit A can be moved from the work preparation position II to the work position I shown in (1), and the pressing roll 5 can be pressed with a low pressing force appropriate for the wiping operation. The interval between the work preparation position II and the work position I is preferably, for example, about 5 to 20 mm. Further, the pressing force of the pressing cylinder 30 is preferably 100 kgf or less, and the pressure receiving area of the piston of the pressing cylinder and the supply pressure are set so as to be such. Further, it is preferable that the large-output opening / closing cylinder 10 and the small-output pressing cylinder 30 have separate hydraulic circuits for driving so that they can be operated independently and independently, and the hydraulic pressure can be set independently.

The opening / closing cylinder 10 is a large-diameter cylinder and has an output greater than the moment corresponding to the product of the center of gravity of the wiping unit A and the maximum turning radius, and is used between the retracted position III and the work preparation position II. Rock it. Since the work preparation position II is immediately before the pressing roll 5 comes into contact with the mill roll R, damage to the surface of the mill roll R due to the wiping unit A colliding with the mill roll R does not occur. Then, the wiping unit A is opened and closed by the opening / closing cylinder 10.
The completion of the movement to the work preparation position may be detected by an arbitrary position detector or a timer, and the pressing cylinder 30 is operated based on the detection signal. As a result, the pin 14 of the pressing frame 1 slides in the long hole 21 of the clevis 20, and the wiping unit A is slightly tilted to move from the work preparation position II to the work position I. As a result, the pressing roll 5 moves the wiping sheet 8 to the mill roll R.
Although the surface is brought into contact with the surface, since the output of the pressing cylinder 30 is small, it comes into soft contact with the mill roll R and does not damage the surface of the mill roll R. As described above, the two-stage operation of the high-output opening / closing cylinder 10 and the low-output pressing cylinder 30 allows the wiping unit A to move quickly,
The impact at the time of contact can be eliminated so that the surface of the mill roll R is not damaged.

When returning the wiping unit A to the retracted position III, the pressing cylinder 30 must first be contracted and then the opening / closing cylinder 10 must be contracted. At this time, since the weight of the wiping unit A is supported by the clevis 20 by the pin 14 hitting the lower arc portion of the long hole 21, no thrust force is applied to the small pressing cylinder 30, and the pressing cylinder 30
Will not damage.

In the above embodiment, the wiping sheet 8 may be a sheet containing abrasive particles such as sandpaper, or may be a sheet having no abrasive particles such as a nonwoven fabric or a non-abrasive polishing cloth. In the former case, the roll surface is polished. In the latter case, the scale can be wiped to wipe off the scale on the roll surface.

Next, keep explained based on details of the word i ping unit A in FIG. A motor 17 is connected to a sprocket 16 coaxial with the winding shaft 6 by a chain 18 or the like so that the wiping sheet 8 can be always wound up, and moreover, tension can be applied to the sheet. A brake 26 is also connected to a sprocket 25 coaxial with the rewinding shaft 7 by a chain 27 or the like, so that a back tension can be added so that the roll-shaped wiping sheet 8 being unwound is not loosened. One end of the pressing roll 5 is connected to a lever 36 via a one-way clutch 35, and the other end of the lever 36 is connected to the tip of a rod 38 of a feed cylinder 37. The lever 36 is composed of half pieces 36a and 36b divided into two in the longitudinal direction so that the length in the longitudinal direction can be adjusted. When the feed cylinder 37 is extended, the rotational force is not transmitted to the pressing roll 5 by the one-way clutch 35, so that the wiping sheet 8 cannot be fed. However, when the feed cylinder 37 is contracted from the extended position, the pressing roll is pressed. 5 rotates in the direction of arrow F, and the wiping sheet 8 is fed from the rewinding shaft 7 to the winding shaft 6 according to the amount of rotation. Therefore, by driving the feed cylinder 37 from time to time, a new portion of the wiping sheet 8 can be always used, and a tension can be applied so that the wiping sheet 8 does not become loose. The front Symbol moving base 4 is reciprocally mounted on the press-on frame 1 with a linear bearing 15 is adapted to reciprocate along the axial direction of the mill roll R in an oscillating Cylinders. Therefore, the contact portion between the surface of the mill roll R and the wiping sheet 8 changes, and wiping is performed effectively.

Next, experimental results of the wiper device according to the present invention will be described. As Example 1, the wiper device shown in FIGS. 1 to 5 having the opening / closing cylinder 10 and the pressing cylinder 30 was prepared. As Comparative Example 1, the opening / closing cylinder without the pressing cylinder 30 was used.
A conventional wiper device that performs a pressing operation with only 10 was prepared. As a test material, stainless steel sheet SU of 0.7mm thickness
Select S430, and wiping sheet 8 has abrasive grains (# 1000)
And non-abrasive grains were used. And mill roll reduction load
An actual machine test was performed under the condition of 650 tons. FIG. 6 shows the results. Incidentally, Ra in the column of the test material roughness is the average value of the roughness,
Rmax indicates the maximum value of roughness, and the unit is μm. Also, the glossiness is as shown in FIG. 7, the incident angle 60 ° light
The reflected light is a specular glossiness measured by a glossiness measuring device, and a higher value means a higher glossiness. In the column of glossiness in FIG. 6, the glossiness measurement value in the T direction (lateral direction) of the plate material is entered at the lower right, and the glossiness measurement value in the L direction (flow direction) is entered at the upper left. First,
In Comparative Example 1, in which only the large-output opening / closing cylinder 10 is used, a large disturbance occurs in the roughness profile of the test material regardless of the presence or absence of abrasive grains on the wiping sheet 8. Gloss values are about 540 to 565 in the L direction and about 500 to 540 in the T direction, indicating low values. This indicates that the pressing force of the opening / closing cylinder 10 was strong, and even if the wiper material was non-abrasive, the roll was mirror-polished, so that the roll surface had flaws, and the roll flaws were transferred to the rolled material. is there. On the other hand, in Example 1, since the pressing force was reduced by the pressing cylinder 30 having a small output, the roughness profile of the test material hardly changed before and after the use of the wiper device, and the gloss (60)
°) is about 565 to 570 in the L direction and about 530 to 560 in the T direction, which is higher than that of Comparative Example 1. This means that no flaw was formed on the roll surface. Before and after the use of the wiper device, when both the abrasive grains (# 1000) and the non-abrasive grains of the wiping sheet 8 are used, the stainless steel plate SUS430 No. 2B finish (JISG
(0203) quality that sufficiently cleared the surface quality specification was obtained.

FIG. 8 is a graph showing the skin pass milling rate and the number of polishing pieces in Example 1 and Comparative Example 1, and shows the results from January to December 1993. From January to mid-April, it was polished in Comparative Example 1, and from mid-April to the end of December, it was polished in Example 1. In Comparative Example 1, since the surface was rough, the number of polishing of the rolls was inevitably increased to around 50,
The skin pass mill implementation rate, which is the ratio of the number of coils actually subjected to skin pass to the planned number of skin pass mill coils, was only about 70 to 75%. On the other hand, in Example 1, since the roll surface after polishing was smooth, the number of polishing was reduced to about 30 to 35 and the skin pass milling rate was about
90-98% was able to be greatly improved.

Although there is a chromium-based stainless steel product whose surface gloss is close to a mirror surface, when the present invention is applied to this product, contact scratches on the wiping sheet do not occur at the circumferential pitch of the roll, and the product is sufficiently passed as a final product. Reached the level. Although the product surface roughness was rolled by a skin pass mill in one coil, the difference between where the roll wiper was applied and where it was not applied disappeared.
For this reason, it was possible to enhance the surface properties of the strip without strongly transferring the newly polished stripes on the roll surface to the strip.

[0019]

According to the present invention, it is contacted without damaging the surface of the mill roll, and during the polishing presses the pressing roll with a small pressing force to the mill rolls, can Rukoto enhances surface properties of the strip, pressing the actuator Damage
A wiper device that can be prevented can be provided.

[Brief description of the drawings]

FIG. 1 is a side view of a wiper device according to an embodiment of the present invention, and an X portion is an enlarged view of an x portion.

FIG. 2 is a rear view of the wiper device of FIG.

FIG. 3 is a plan view around a clevis 20 and a pressing cylinder 30.

FIG. 4 is a longitudinal sectional view around the clevis 20 and the pressing cylinder 30.

FIG. 5 is a side view of the wiping unit A.

FIG. 6 is an explanatory diagram showing experimental results of Example 1 and Comparative Example 1 according to the present invention.

FIG. 7 is an explanatory diagram of a procedure for measuring glossiness.

FIG. 8 is a graph showing the execution rate of the skin pass mill and the number of polishing pieces in Example 1 and Comparative Example 1 according to the present invention.

FIG. 9 is an explanatory diagram of a conventional wiper device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Pressing frame 4 Moving base 5 Pressing roll 6 Winding axis 7 Rewinding axis 8 Wiping sheet 10 Opening / closing cylinder 30 Pressing cylinder

Continued on the front page (72) Inventor Masayuki Saiga 5-2 Sokai-cho, Niihama-shi, Ehime Sumitomo Heavy Industries Machinery Co., Ltd. Niihama Works (72) Inventor Keizo Abe 5-2 Sokai-cho, Niihama-shi, Ehime Sumitomo Heavy Industries (56) References JP-A-61-274866 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21B 28/04 B24B 5/37 B24B 21/00 B24B 21/12

Claims (1)

(57) [Claims] 1. A pressing frame, a moving base mounted on the pressing frame so as to be able to reciprocate along the axial direction of a mill roll, a pressing roll mounted on the moving base, and moving on both sides of the pressing roll. A rewind shaft and a take-up shaft rotatably supported on a base, a wiping sheet wound around the rewind shaft and the take-up shaft from both ends thereof, and a halfway wound around the pressing roll; A wiping unit comprising sheet feeding means for feeding a sheet, a wiping unit, a work preparation position immediately before the wiping sheet wound around the pressing roll comes into contact with the mill roll, and the pressing roll being separated from the mill roll. A high output opening / closing actuator for moving the pressing roll from the work preparation position to the pressing roll. Wiping sheet which is wound around the Ri Do and a pressing actuator of small output for pressing into a working position pressed against the mill roll surface, the on-off actuator is opened and closed cylinder, the opening and closing
In the long hole formed in the clevis at the tip of the cylinder rod,
The pin passed through the bracket of the pressing frame is loosely fitted.
While supporting the clevis bottom and the pressing roll.
The pressing actuator is interposed between the bracket and the bracket.
Wiper device mill rolls, characterized in that those were.