JP5724900B2 - Fund for rolling mill - Google Patents

Description

  The present invention relates to a fund for a rolling mill.

  In general, a rolling machine for rolling a material to be rolled is provided with a fund. This fund has a role of peeling the rolled material after rolling from the rolling roll and physically suppressing warpage of the rolled material.

  At the contact portion between the fund and the material to be rolled after repeated rolling, seizure or wear occurs due to friction with the material to be rolled. In addition, the higher the tensile strength of the material to be rolled, the greater the warpage of the steel sheet after rolling, but in recent years the opportunity to roll high-tensile materials has increased due to the higher grades of steel material components. The frequency of image sticking is also increasing. Then, when rolling is performed using the burned-in raw material as it is, crimping rods and wire rods remain on the material to be rolled, leading to deterioration of the test yield. In order to avoid this, it is necessary to perform maintenance of the funding that has been burned.

  Conventionally, the maintenance of the funding that has been seized has been performed by shaving the seized part with a grinder. However, since the seizure portion of the fund is located in a very narrow place in terms of equipment, the periphery of the seizure portion is dark and the operator must work in a state where his hand is not visible. Further, since the burn-in portion is above the pass line, the operator must work while looking into the fund from below to work while checking the burn-in portion. When working in such a state, there is a risk of burns or injury due to the sparks of the grinder falling on the worker or the operator touching the surrounding high-temperature equipment.

  In order to avoid such a situation, it is conceivable to replace the fund itself without scraping the burned fund with a grinder. For example, Patent Document 1 discloses a recombination mechanism for a guide device including a fund. As another method, the material of the fund is cast iron with a large amount of C, so that carbon becomes a lubricant, and the friction between the fund and the material to be rolled can be reduced. Thereby, the frequency of burn-in of the fund can be reduced, and the frequency of maintenance of the burn-in part can also be reduced.

JP 2007-167958 A

  However, since the guide recombination mechanism disclosed in Patent Document 1 is for exchanging the entire guide device including the fund, it takes a lot of time for the exchange. For this reason, if the seizure portion of the fund is not cut with a grinder, the guide device must be replaced every time the seizure occurs on the fund, resulting in a decrease in production line throughput. Even if cast iron is used as the material of the fund, it is inevitable to replace the entire fund every time the seizure occurs, unless the seized part is cut with a grinder.

  In order to solve the above problems, the object of the present invention is to provide a rolling mill hood capable of reducing the frequency of seizure occurring at the contact portion between the fund and the material to be rolled and maintaining the seized portion easily. There is to do.

According to the present invention, a rolling mill fund is provided on the upper side and / or lower side of the pass line on the entry side and / or exit side of the rolling roll, and is formed of the fund body and cast iron or a hard-to-bake material. A rolling mill und is provided, characterized in that the rolling liner has a vertically symmetrical shape and is attached to a contact portion with a material to be rolled.

The liner is preferably fixed from the side of the fund body .

  According to the present invention, by attaching a liner formed of cast iron or a non-baked material to the contact portion between the fund and the rolled material, friction with the rolled material can be reduced and the frequency of seizure can be reduced. Can do. Further, even if seizure occurs, the liner can be exchanged, so that it is not necessary to exchange the entire fund. Thereby, it is possible to maintain the burned-in portion of the fund safely and in a short time.

1 is a schematic view of a shape rolling mill according to an embodiment of the present invention. It is the schematic of the shape rolling mill seen from the X direction of FIG. It is explanatory drawing of the fund based on embodiment of this invention. It is AA sectional drawing of FIG. It is explanatory drawing of the liner which concerns on embodiment of this invention. It is a figure which shows an example of the attachment position of the liner which concerns on embodiment of this invention. It is the result of having compared the ratio of the residual flaw of a to-be-rolled material when a to-be-rolled material is rolled by the conventional shaped steel rolling mill and the shaped steel rolling mill which concerns on this invention.

  Hereinafter, an embodiment of the present invention will be described based on a section rolling mill 1 in a rough rolling process of H-section steel. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 1, the shape steel rolling mill 1 includes a rolling roll 2 for roughly rolling a material to be rolled. A transport table 3 for transporting the material to be rolled is arranged below the pass line P on the entry side and the exit side of the rolling roll 2. And it is comprised so that a to-be-rolled material may be conveyed toward the right direction from the left of FIG.

  On the rear side of the rolling roll 2, that is, on the exit side of the material to be rolled, a fund 4 fixed to a guide device (not shown) for guiding the material to be rolled is disposed. The fund 4 is arranged so that its lower surface can come into contact with the workpiece to be warped, and the warpage of the material to be rolled that has passed through the rolling roll 2 can be corrected. Further, the fund 4 is also arranged so as to be close to the rolling roll 2, and the material to be rolled that is in close contact with the rolling roll 2 after rolling can be peeled off. In the present embodiment, as shown in FIG. 2, three funds 4 are arranged above the pass line.

  As shown in FIGS. 3 and 4, the periphery of the contact portion of the fund 4 with the material to be rolled has been processed, and a portion of the fund 4 has been scraped off. A liner 4b that is in direct contact with the material to be rolled after rolling and a jig 4c that fixes the liner 4b are disposed in the scraped portion. That is, the hood 4 includes a hood body 4a that is a portion excluding the liner 4b and the jig 4c, the liner 4b, and the jig 4c. The three funds 4 shown in FIG. 2 are all configured as described above.

  The liner 4b is made of cast iron and has a substantially rectangular parallelepiped shape and a vertically symmetrical shape as shown in FIG. Further, the corners are tapered so that the material to be rolled can smoothly pass through the lower surface of the fund 4. Further, as shown in FIG. 4, a jig receiving portion cut into a substantially V shape is formed at the center of the side surface in the width direction of the liner 4b so that the jig 4c can be received. Yes. The jig 4c for fixing the liner 4b is fitted to the jig receiving portion of the liner 4b so as to hold the liner 4b from the side of the fund body 4a, and is fixed to the side surface of the fund body 4a by bolts 4d.

  The rough rolling method of the H-section steel in the section rolling mill 1 configured as described above will be described. First, the material to be rolled is transported from the left in FIG. 1 to the right by the transport table 3 and passed through the rolling roll 2. At this time, the material to be rolled is roughly rolled by passing through the rolling roll 2. And the to-be-rolled material closely_contact | adhered to the rolling roll 2 is peeled by the fund 4 arrange | positioned above the pass line of the exit side of to-be-rolled material.

  Thereafter, the material to be rolled is transported to the subsequent process again by the transport table 3 while the upper warp is corrected by the liner 4 b provided at the contact portion with the material to be rolled on the lower surface of the fund 4. At this time, friction is generated at the contact portion between the liner 4b of the fund 4 and the material to be rolled, but since the liner 4b is formed of cast iron, carbon serves as a lubricant and can reduce friction. For this reason, the liner 4b is difficult to seize.

  In this way, the rough rolling process of the H-shaped steel is performed. If rolling is repeated, seizure occurs in the liner 4b of the fund 4 due to friction with the material to be rolled. It becomes impossible to do. In that case, first, the bolt 4d of the jig 4c fastened to the side surface of the fund body 4a is loosened, and the liner 4b in which seizure has occurred is removed. Then, the liner 4b is turned upside down, the surface on which no seizure occurs is aligned with the lower surface of the fund 4, fixed to the jig 4c, and the bolt 4d that has been loosened is tightened again. If the liner 4b is exchanged in this way, the rolling can be repeated again. Thereafter, when the seizure occurs again, the liner 4b on which the seizure has occurred may be replaced with another new liner 4b.

  As described above, according to the present invention, since the liner is formed of cast iron, the frequency of seizure of the fund can be reduced, and even if seizure occurs, the liner can be easily replaced. . This eliminates the need for the operator to scrape off the seized portion with a grinder, and eliminates the need to replace the entire fund. As a result, the burn-in portion can be maintained safely and in a short time, and the throughput of the production line can be improved. Moreover, since only the material of the liner is cast iron, the cost can be reduced as compared with the case where the entire material of the fund is cast iron.

  Further, the material of the liner is not limited to cast iron as long as it is a hard-to-burn material. . Even when the liner material is a hard-to-burn material, the frequency of seizure of the fund can be reduced as in the case where the liner material is cast iron. Thereby, the exchange span of the fund can be lengthened and the throughput of the production line can be improved.

  In general, a fund used in a shape steel rolling mill has an appropriate shape and width depending on the product size of the H-section steel. In such a case, in the present invention, the same liner and jig can be used for the und body having different shapes and widths by processing the und body so that the same liner can be accommodated. it can. For this reason, it is not necessary to produce a liner and jig according to the size of the fund body, and the cost can be reduced.

  Moreover, the attachment position of the liner is not limited to an attachment position that is symmetrical in the width direction of the fund body as shown in FIG. 4, and may be an attachment position as shown in FIG. 6. That is, considering the shape of the rolling roll, product shape, clearance with peripheral parts, etc., the liner is mounted at a position where the product warpage can be effectively suppressed, and further, the liner can be easily replaced. It is preferable.

  Further, if the shape of the liner is a vertically symmetrical shape, the same liner can be used by reversing the liner upside down and fixing it again to the jig when replacing the liner with seizure. That is, since it is not necessary to replace with a new liner, the cost can be reduced.

  In addition, since the shape steel rolling according to the embodiment of the present invention is intended for one-pass rolling, the fund is provided on the exit side of the material to be rolled of the rolling roll. A fund may be provided on the entry side of the rolled material. If it does so, at the time of reverse rolling, the effect similar to the effect mentioned above will be acquired by the fund provided in the entrance side. That is, it is preferable that the fund is appropriately arranged on the entry side, exit side, and upper side and lower side of the pass line P according to the rolling purpose and rolling method.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to this example. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  For example, in the embodiment of the present invention, the present invention is used in a shape rolling mill for producing H-section steel, but is not limited to H-section steel, and is applicable to other shape rolling mills. You can also Further, the rolling mill to which the present invention can be applied is not limited to a shape steel rolling mill, but can also be applied to a rolling mill for manufacturing steel sheets.

  The material to be rolled was repeatedly rolled using a conventional shape rolling mill and a shape rolling mill according to the present invention. FIG. 7 shows the result of comparing the ratio of soot remaining in the material to be rolled at that time. In the present embodiment, 100 is the residue remaining on the material to be rolled by the conventional shape rolling mill. Moreover, the material of the fund used for the conventional shape rolling mill is S45C. Moreover, the material of the fund body used for the shape rolling mill according to the present invention is S45C, and the material of the liner is FC300 which is a kind of cast iron.

  As shown in FIG. 7, when the shape steel rolling mill according to the present invention was used, the wrinkles remaining in the material to be rolled decreased by about 90% compared to the case where the conventional shape steel rolling mill was used. This indicates that the fund used in the shape steel rolling mill according to the present invention is less likely to be seized even when the material to be rolled is repeatedly rolled as compared with the conventional fund. That is, the use of FC300, which is a kind of cast iron, as the material of the liner according to the present invention, carbon acts as a lubricant at the contact portion between the liner and the material to be rolled, and the effect of reducing friction is recognized. It was.

  The present invention can be applied to a section rolling mill for producing H-section steel.

DESCRIPTION OF SYMBOLS 1 Shape steel rolling machine 2 Roll roll 3 Conveying table 4 Fund 4a Fund main body 4b Liner 4c Jig 4d Bolt

Claims (2)

A rolling mill hood provided on the upper side or / and lower side of the pass line on the entry side and / or exit side of the rolling roll,
Fund body,
It consists of a liner made of cast iron or hard-to-baked material,
The rolling mill undulation, wherein the liner has a vertically symmetrical shape and is attached to a contact portion with a material to be rolled.   The rolling machine hood according to claim 1, wherein the liner is fixed from a side of the hood body.

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