JP3478216B2 - Foreign matter removal method of reversible rolling mill auxiliary roll - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing foreign matter from a reversible rolling mill auxiliary roll suitable for removing foreign matter from an auxiliary roll of a reversible rolling mill. [0002] Cold rolling of difficult-to-work materials such as stainless steel and silicon steel is performed using a multi-high rolling mill such as a 12-high rolling mill or a 20-high rolling mill. FIG. 3 is a schematic side view showing an example of a 12-high rolling mill. As shown in the drawing, tension reels 2 and 2A are provided on the left and right sides of a rolling stand 1, and a rolled material 3 is rolled while reciprocating between the left and right tension reels 2 and 2A a plurality of times. In addition, 4, 4A is an auxiliary roll (deflector roll), 5, 5A is a shape detection roll,
6, 6A is a wiper roll. The auxiliary roll serves to change the transport direction of the rolled material, and the wiper roll is fed out while the lubricating oil used when the rolling mill rolls the rolled material remains on the rolled material even after rolling. It serves to cut this. By the way, if you do not cut the lubricating oil, the rolled material will meander when winding on the tension reel,
This is for preventing the coil from being wound in a coil shape having uneven width end faces, resulting in poor appearance quality. According to such a so-called reversible rolling mill,
Difficult-to-work materials can be rolled to a desired thickness with one rolling roll stand. However, on the other hand, when the lubricating oil is cut off by the wiper roll, consequently, the auxiliary rolls 4 and 4A, which are not sufficiently washed, rotate forward and reverse, so that foreign substances such as abrasion powder, dust, iron powder, and oxidized scale are removed from the auxiliary roll. When adhered to 4, 4A or the rolled material 3 and the rolling is repeated as it is, these foreign substances bite into the surface of the rolled material 3 and the rolls are also flawed and transferred to the rolled material.
In addition, the lubricating oil adhered to the rolled material and not removed by the wiper roll 6 or 6A adheres to the auxiliary rolls 4 and 4A and is not removed. As a result, the adhesion of foreign matters is promoted and the auxiliary roll and the rolled material are slipped. It may cause flaws. [0004] In order to solve this problem, the surface of the auxiliary roll is shot blasted and then chromium plated to improve the wear resistance and pick-up resistance. There are known ways to prevent this. However, in this method,
After the addition of a new auxiliary roll, as the cumulative rolling amount increases, the roll roughness decreases within a short period of time, and the effect is lost. On the other hand, as means for removing foreign matter from an auxiliary roll of a reversible rolling mill, Japanese Patent Application Laid-Open Nos.
As described in Japanese Patent Application No. 58016, there is known a method in which two wiping members are alternately pressed against the surface of a rotating auxiliary roll to scrape foreign substances adhered to the roll surface. In both cases, according to the normal rotation and reverse rotation of the auxiliary roll, one of the two wiping members corresponding to the roll rotation direction is brought into contact with the roll, and the other wiping member is separated from the roll. At this time, foreign matter adhering to the roll surface can be effectively removed even at the time of reverse rotation. Japanese Patent Application Laid-Open No. Hei 9-12212 discloses that the life of the wiping member can be extended, and Japanese Patent Application Laid-Open No. Hei 10-58016 discloses an effect obtained by alternately contacting the wiping members. It is described that the foreign matter scraped off by the step can be prevented from re-adhering to the roll. In Japanese Unexamined Patent Publication No. Hei 9-1212, the wiping member is in the form of a blade, which is a metal rectangular thin plate, for example, an aluminum alloy, stainless steel or the like. In Japanese Patent Application Laid-Open No. 10-58016, although not particularly limited, preferable wiping members are rubber, resin, sponge, felt, and the like, and the shape may be square or blade. However, according to these prior arts, each time the direction of rolling is changed, one of the two wiping members is brought into contact with the roll surface, and at the same time, the other is separated from the roll surface. Must be repeated alternately.
For this reason, the control for performing the contact / separation is complicated, and the installation cost for manufacturing control software is increased, and the maintenance load is large. The apparatus disclosed in Japanese Patent Application Laid-Open No. 9-1212 is suitable for scraping foreign substances because the contact piece with the roll surface is a metal blade, but is not suitable for wiping lubricating oil. The device disclosed in Japanese Unexamined Patent Publication No. Hei 10-58016 is suitable for wiping lubricating oil because the contact piece is made of rubber, resin, sponge, felt or the like, but is not suitable for scraping foreign matter. Accordingly, the present invention enables both the scraping of foreign matter and the wiping of lubricating oil to the auxiliary roll of a reversible rolling mill, and furthermore, the rewinding of foreign matter without increasing cost and maintenance load. It is an object of the present invention to provide a method for removing foreign matters of a reversible rolling mill auxiliary roll, which can prevent the foreign matter. [0009] The present invention is a method for removing foreign matter adhered to the auxiliary roll surface of a reversible rolling mill,
A first wiper is provided on the forward side of the contact portion between the rolled material and the auxiliary roll, and a second wiper is provided on the opposite side, with a direction following the rolled material heading toward the rolling mill as a forward direction. The first wiper is always in contact with the wiper and the auxiliary roll surface, and the second wiper is only at the start of forward rolling. Is the way. In the present invention, it is preferable that the tip of the first wiper is made of a felt plate and the tip of the second wiper is made of a resin blade. FIG. 1 is an explanatory diagram showing an example of an embodiment of the present invention. In FIG. 1, a tension reel 2 (see FIG. 3) is disposed on the left side of the auxiliary roll 4, and a rolling stand 1 (see FIG. 3) is disposed on the right side of the shape detection roll 5. Reference numeral 10 denotes a first wiper, which is constituted by detachably attaching a wiping member 11 forming a tip of the wiper to a holder 12. The holder 12 is attached to the frame 13 and constantly presses the end surface of the wiping member 11 against the roll surface of the auxiliary roll 4 (except during maintenance). Reference numeral 20 denotes a second wiper, which is constituted by sandwiching a scraping member 21 forming the tip of the wiper between air tubes 24 and 25 and detachably attaching the same to a holder 22. holder
Reference numeral 22 is attached to a frame 23. Second wiper 20
In order to facilitate the contact / separation between the wiper tip and the auxiliary roll surface, the scraping member 21 is connected to the air tubes 24, 25.
It is fixed by sandwiching it. In FIG. 1, the air tube
When the air tube 24 is inflated and the air tube 25 is contracted, the scraping member 21 is separated from the roll surface. Conversely, when the air tube 24 is contracted and the air tube 25 is inflated, the scraping member is
21 is pressed against the roll surface. The actuator for bringing the tip of the wiper into contact with or separating from the auxiliary roll surface may be a rack and pinion, a cylinder, or the like, in addition to the air tube. First wiper 10
Is for wiping foreign substances such as abrasion powder, dust, iron powder and oxide scale and excess lubricating oil from the roll surface.The material of the tip of the wiper does not cause scratches on the roll surface, Felt is preferred from the viewpoint that impregnation can be sufficiently performed. The shape may be the square plate shape in this example, or may be the shape of a pointed blade. The second wiper 20 scrapes the foreign matter from the roll surface, and for the purpose, it is preferable that the wiper scraping member is shaped like a sharp blade. The material is preferably a resin from the viewpoint that the material does not cause scratches on the roll surface and has a sufficient elastic modulus to peel off foreign matter from the roll surface. In addition, among the resins, those that do not generate scum due to friction with the roll surface and have heat resistance up to about 150 ° C. are more preferable. From such a viewpoint, epoxy resins, bakelite, nylon, polycarbonate, and the like, and It is preferable that these resins are reinforced with fibers or fillers. Copper is preferred other than resin. As shown in FIG. 1, the arrangement of the first and second wipers is such that a contact point O between the rolled material 3 and the auxiliary roll 4 in the roll surface is provided.
It is preferable that the contact points A and B of the first and second wipers 10 and 20 are sequentially arranged in the forward direction (clockwise in FIG. 1). In addition, the second wiper 20 draws a vector from the contact point B toward the root of the blade, and when drawing a roll peripheral velocity vector at the contact point B during forward rolling, both are arranged so as to form an acute angle. Is preferred. If the angle between the two vectors is an obtuse angle, it becomes difficult to scrape foreign particles in forward rolling. The first wiper 10 is used for removing the lubricating oil on the roll surface of the auxiliary roll 4. In addition, the foreign matter relatively weakly adhering to the roll surface is also removed at the same time. In the method in which the first wiper 10 intermittently contacts the roll surface during rolling, the removal of the lubricating oil becomes insufficient,
Slip occurs between the rolled material and the auxiliary roll, and the rolled material has slip flaws. Therefore, it is important that the first wiper is always used while pressed against the roll surface during rolling. By the way, if the first wiper 10 is constantly pressed, foreign matter 30 accumulates on the contact portion between the wiping member 11 and the auxiliary roll 4 during reverse rolling. Reverse rolling is completed,
Next, when starting rolling in the forward direction, the foreign matter 30 is removed by the first wiper 10.
, And moves with the rotation of the auxiliary roll 4 in the forward direction. When the second wiper 20 is separated from the roll surface, the foreign matter 30 reaches the contact point O, moves to the rolled material, is carried to the rolling mill, enters the roll bite, and causes a roll roll defect, By pressing the second wiper 20 against the auxiliary roll 4, the foreign matter 30 can be effectively removed. In addition, the foreign matter 31 is a member for wiping during the forward rolling.
11 accumulates at the contact portion with the auxiliary roll 4.
Is carried away to the tension reel side opposite to the rolling mill at the time of the next reverse rolling, so that this does not cause a roll roll flaw. Here, according to the investigation by the present inventors, the second
The same as the first wiper 10, the wiper 20 of the
In the reverse rolling, foreign matter 32 accumulates at the contact portion between the scraping member 21 and the auxiliary roll 4, and at the start of forward rolling, the foreign matter 32 successively moves from the roll surface to the contact O to the rolled material. It was conveyed to a rolling mill, and it was found that rolling roll flaws might be generated. When the second wiper 20 is constantly pressed against the auxiliary roll 4, the life of the scraping member 21 is short and the frequency of replacement is high, and the roughness caused by friction between the auxiliary roll 4 and the scraping member 21 is increased. Due to the decrease, the life of the auxiliary roll 4 tended to be shortened. On the other hand, when an attempt was made to separate the second wiper 20 from the auxiliary roll 4 except during the start of forward rolling, foreign matter that would slip through the first wiper during this separation would cause a roll roll flaw. I was worried that it would occur, but surprisingly, rolling roll flaws no longer occurred. From this, it is considered that only the foreign matter that has accumulated in the contact portion between the tip of the wiper 20 and the auxiliary roll 4 and accumulated and aggregated to a certain size or more has a roll roll flaw when it is transported to the rolling mill. Therefore, according to the present invention, the second wiper 20 is pressed (pressed) against the roll surface of the auxiliary roll 4 at the start of forward rolling according to the operation control mode shown in the time chart of FIG. At that time, the roll was separated (opened) from the roll surface. This repetition of pressing and opening can be easily performed by alternately expanding and contracting the air tubes 24 and 25. Thus, the first wiper can be used during reverse rolling.
Foreign matter 30 that has accumulated and agglomerated at the contact portion between 10 and the auxiliary roll 4
The second wiper in the pressed state at the start of the next forward rolling
After the removal, the second wiper 20 is immediately opened, so that foreign matter at the contact portion between the second wiper 20 and the auxiliary roll 4 during the next reverse rolling is removed. Therefore, it is possible to prevent foreign matters deposited and agglomerated at the contact portion between the tip of the wiper 20 and the auxiliary roll 4 from being carried to the rolling mill, and to effectively prevent the occurrence of roll roll flaws. Can be. According to the present invention, the first wiper is always pressed, and the second wiper needs to be repeatedly pressed and released. This is performed by a simple mechanism such as an air tube at a predetermined timing. Since it is sufficient to produce simple control software for controlling the expansion and contraction, it is simpler than changing the side where two wipers are pressed alternately according to the rolling direction as in the prior art.
The increase in installation cost and maintenance load is hardly a problem. EXAMPLE Using a 12-high rolling mill (reversing rolling mill) shown in FIG. 3, a reversible rolling method in which a steel sheet is reciprocated between left and right tension reels 2 and 2A on a ferritic stainless steel sheet SUS430. And cold-rolled. In this cold rolling, the first and second wipers are respectively installed on the left auxiliary roll 4 in FIG. 3 in the form shown in FIG. 1, and the first and second wipers are mounted on the auxiliary roll 4A in FIG. 1 is installed in the form of left and right hand reverse to that of FIG. 1, the first wiper is always pressed, and the second wiper is used only when the rolling of the forward rolling is started. Example 2) Case 2: Rolling was carried out in three different ways: pressing (Comparative Example 1) and always opening (not used; Comparative Example 2). Example, Comparative Examples 1 and 2, defect rate due to occurrence of surface flaws on the steel sheet after rolling, auxiliary roll life (replacement cycle of auxiliary roll), and Example and Comparative Example 1, wiper life of second wiper (wiper The tip replacement cycle was investigated. The wiper tip of the first wiper was formed of a felt plate, the wiper tip of the second wiper was formed of a resin blade, and glass fiber reinforced epoxy resin was used as the resin. Table 1 shows the results of the investigation. Comparative Example 2 had a defective rate of 5%, and Comparative Example 1 had a defective rate of 1%.
In the example, the defect rate was 0%, and the surface flaw of the steel sheet could be completely prevented. Also, in Comparative Example 1, the wiper life was as short as 2 months, and the auxiliary roll life was 4 months, which was significantly shorter than the 12 months in Comparative Example 2. The life of the auxiliary roll was maintained at 12 months, which is the same as that of Comparative Example 2. [Table 1] Thus, according to the present invention, it is possible to perform both scraping of foreign matter and wiping of lubricating oil on the auxiliary roll of the reversible rolling mill, and without increasing installation cost and maintenance load. Thus, there is an excellent effect that re-entanglement of foreign matter can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing an example of an embodiment of the present invention. FIG. 2 is a time chart illustrating an example of an operation control mode of a second wiper according to the present invention. FIG. 3 is a schematic side view showing an example of a 12-high rolling mill. [Description of Signs] 1 Rolling stand 2, 2A Tension reel 3 Rolled material 4, 4A Auxiliary roll (deflector roll) 5, 5A Shape detection roll 6, 6A Wiper roll 10 First wiper 11 Wiping member 12, 22 Holder 13 , 23 frame 20 second wiper 21 scraping member 24, 25 air tube 30, 31, 32 foreign matter

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-58016 (JP, A) JP-A 9-1212 (JP, A) JP-A-6-254602 (JP, A) JP-A 2000-176518 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B21B 28/04

Claims (1)

(57) [Claim 1] A method for removing foreign matter adhering to an auxiliary roll surface of a reversible rolling mill, wherein a direction in which a rolled material is directed to a rolling mill is taken as a forward direction, In addition to having a first wiper on the forward side of the contact portion between the rolled material and the auxiliary roll and a second wiper on the opposite side, a contact timing between the wiper and the auxiliary roll surface is provided. A foreign matter removing method for an auxiliary roll of a reversible rolling mill, wherein the first wiper is always used, and the second wiper is used only at the start of forward rolling.