KR100799508B1 - Roll chock, manufacturing method thereof and rolling mill - Google Patents

Abstract

A roll chock with improved corrosion resistance and wear resistance is provided to improve quality of a final product and improve the output by increasing wear resistance and corrosion resistance of a contact part between a chock and a liner, thereby improving rolling performance, a manufacturing method of the roll chock is provided, and a rolling mill comprising the roll chock is provided. A manufacturing method of a roll chock comprises: (Sa) a casting step of forming a cast article that is a base of the roll chock; (Sb) a rough machining step of rough machining the cast article such that a portion of the cast article that does not contact a liner has a margin of 3 to 5 mm based on a final article, and a groove with a depth of 3 to 5 mm is formed in a portion of the cast article that contacts the liner based on the final article; (Se) a quality determining step of taking a nondestructive test on the rough machined article and comparing the test results with a reference quality to determine quality of the rough machined article; (Sc) a hardfacing layer forming step of performing hardfacing operation of the groove using a stainless steel-based welding rod to form a hardfacing layer with a height of 8 to 15 mm on the groove; (Sg) a stress relieving step of subjecting the hardfacing article to a heat treatment at a temperature of 600±25 deg.C for 50 to 70 minutes after performing the hardfacing layer forming step; and (Sd) a finish cutting step of finish cutting the cast article having the hardfacing layer formed thereon to adjust dimensions of the cast article.

Description

Roll choke with improved corrosion resistance and abrasion resistance, manufacturing method and rolling device {Roll Chock, Manufacturing Method

1 is a perspective view showing a conventional rolling device.

2 is a cross-sectional view of the rolling apparatus shown in FIG.

3 is a perspective view showing a roll choke of the present invention.

4 is a cutaway perspective view of the roll choke shown in FIG.

5 is a perspective view showing a work roll and work roll chocks of the present invention.

6 is a bottom perspective view of the work roll and work roll chocks shown in FIG. 5;

7 is a perspective view showing a support roll and a support roll choke of the present invention.

8 is a schematic view showing one embodiment of a method for producing a roll choke of the present invention.

9 is a schematic view showing another embodiment of the roll chocks manufacturing method of the present invention.

** Description of the symbols for the main parts of the drawings **

1000: rolling equipment

100 housing 200 liner

300: work roll 310: work roll choke

311 body 312 bearing receiving portion

313: roller receiving portion 314: body support

315: side support

320: Bearing

400: support roll 410: support roll choke

420: Bearing

500: Foster Welding Layer

600: rolled material

Sa-Sg: each step of the manufacturing method of the roll chalk of this invention

The present invention relates to a roll choke having a high corrosion resistance and abrasion resistance, a method for manufacturing the same, and a rolling apparatus, and more specifically, by forming a growth welding layer using SUS309 on a body support portion or a side support portion, which is a contact portion with a liner. The present invention relates to a roll choke with improved corrosion resistance and abrasion resistance, a manufacturing method thereof, and a rolling apparatus.

In general, the manufacturing process of steel is largely composed of a steel making process, steelmaking process, casting process and rolling process. The iron making process is a process of removing oxygen in iron ore and melting iron ore to produce pig iron, and the steel making process is a process of manufacturing steel by removing impurities of pig iron which has been subjected to the iron making process, and the casting process is a continuous casting machine It is a process of manufacturing an intermediate material such as slab, bloom or billet having a predetermined shape while passing through the steel in a liquid state, and the rolling process is a process of forming / modifying a steel sheet or a wire to suit the purpose of use.

The roll choke is shown in Figure 1 a general rolling apparatus as one of the components used in the rolling process.

As shown in FIG. 1, the conventional rolling apparatus includes a housing 100, a work roll 300 provided inside the housing 100 and in contact with a rolled material, and the work roll 300. A support roll 400 (Back Up Roll) for supporting the support roll, a support roll choke 410 (Back Up Roll Chock) provided at both ends of the support roll 400 to operate the support roll 400, and It is provided on both ends of the work roll 300 is characterized in that it comprises a work roll choke 310 (Work Roll Chock) for operating the work roll 300.

The rolling apparatus is exposed to a high temperature and high pressure environment of about 1000 ~ 1200 ℃ not only causes problems such as thermal fatigue cracks, hot wear, deformation, corrosion, but also the thermal fatigue is repeated by heating and cooling by cooling water High strength is required to withstand its own load.

In particular, the roll chocks and the housing are in contact with each other to generate a frictional force, which causes a problem that the roll chocks and the housing are easily worn at the contact portion and the choke and the liner mounting surface are easily corroded.

When abrasion occurs at the contact area between the roll chocks and the housing or corrosion occurs at the liner mounting surface, thickness variation of the final product is generated, surface quality is deteriorated, and a defective rate is increased, and the life of the roll choke is shortened, so that the roll Many mechanics are required to replace the choke, and production costs increase as the work stops, causing a problem in that the production efficiency is lowered.

In order to solve the above problems, there has been disclosed a technique further including a liner at the contact portion of the roll choke and the housing.

The rolling apparatus 1000 as described above is illustrated in FIG. 2. The rolling device 1000 shown in FIG. 2 is the same as other components, but is further provided with a liner 200 provided to prevent wear between the housing 100, thereby reducing wear of the roll chocks and the housing. It is responsible for guiding the roll chocks.

However, even if the liner is further provided, in the case of the roll choke that withstands continuous thermal fatigue and high load, the roll choke still wears and corrodes, and thus the technology cannot completely solve the conventional problem. .

Conventional rolling apparatus and roll chalk are also shown with the same reference numerals in the case of the same components as the present invention.

Accordingly, the present invention has been made to solve the above problems, the object of the present invention is to increase the wear resistance and corrosion resistance on the mounting surface of the choke and liner significantly reduce the corrosion and wear of the contact area to improve the rolling performance It is to provide a roll choke, a manufacturing method and a rolling apparatus having improved corrosion resistance and abrasion resistance to improve the quality of the product and increase the yield.

In addition, the object of the present invention is to prevent the occurrence of corrosion and wear on the joint surface of the roll choke and lighter to facilitate the removal of the liner replacement, to reduce the downtime period, and to increase the replacement cycle of the roll choke to reduce the manufacturing cost It is to provide a roll choke, a manufacturing method and a rolling apparatus having improved corrosion resistance and wear resistance that can be reduced.

The roll choke to increase the corrosion resistance and wear resistance of the present invention for achieving the above object is a body formed on the upper and lower body support; A bearing accommodating part formed to accommodate the bearing inside one side of the body; A roller receiving part connected to the bearing receiving part inside the other side of the body and having a roller; In the roll chocks formed including, the roll choke is connected to one side of the body support portion to support one or more side support portions to support the roll choke is formed, the welding layer to the body support portion or the side support portion It is characterized by being formed.

In addition, the growth welding layer is characterized in that it is formed using a stainless steel (Stainless) series of electrodes.

On the other hand, the manufacturing method of the roll choke of the present invention, a method of manufacturing a roll choke provided in the rolling apparatus, a) casting step of producing a casting product as the basis of the roll choke; b) Roughening the grooves of the basic casting to have a margin of 3 ~ 5mm relative to the final product, the grooves 3 ~ 5mm deep relative to the final product in the area where the liner is in contact with each other. Roughing step of processing; c) a growth welding layer forming step of forming and growing a growth welding layer having a height of 8 to 15 mm by using a stainless steel welding rod in the groove; And d) finishing processing to adjust the dimensions by finishing the cast product on which the growth welding layer is formed; Characterized in that it is prepared to include.

In addition, the manufacturing method of the roll choke after the step b), e) non-destructive inspection of the rough processed product and comparing the inspection result and the reference quality to determine the quality of the rough processed product; Is further included, and if the determination result in step e) does not meet the criteria, after step e), f) Arc-Air Gouging or A defect removal step of removing defects by grinding; It is characterized in that it is further included.

In addition, the roll choke manufacturing method is a stress relief step of heat treatment for 50 ~ 70 minutes at a temperature of 600 ± 25 ℃ after step c); It is characterized in that it is further included.

In addition, the step c) is characterized in that the flux mixed wire welding method (MAG welding method) or coated arc (ARC) welding method, the step c) is to preheat the welded to 100 ~ 120 ℃, the temperature between the welding layer It is characterized by setting to 120 ~ 220 ℃.

On the other hand, the rolling apparatus of the present invention is characterized in that it is a roll chalk having the above characteristics.

The rolling apparatus of the present invention includes a housing, a liner provided to prevent abrasion between the housing, a work roll provided inside the housing and in contact with a rolled material, and a support roll supporting the work roll. (Back Up Roll), a support roll choke provided at both ends of the support roll to operate the support roll, and a work roll choke provided at both ends of the work roll to operate the work roll ( Work Roll Chock), wherein the roll choke is characterized in that the build-up welding (Build Up Welding) layer is formed in a portion in contact with the liner.

In addition, the growth welding layer is characterized in that formed of SUS309.

Hereinafter, with reference to the accompanying drawings, a roll choke, a method of manufacturing the same, and a rolling apparatus having high corrosion resistance and wear resistance of the present invention having the characteristics as described above will be described in detail.

Figure 3 is a perspective view showing a roll choke of the present invention, Figure 4 is a cut perspective view of the roll choke shown in Figure 3, as shown in Figures 3 and 4, to improve the corrosion resistance and wear resistance of the present invention The chokes 310 and 410 may include: a body 311 having body support parts 314 formed on upper and lower surfaces thereof; A bearing receiving part 312 formed to receive bearings 320 and 420 inside one side of the body 311; A roller receiving part 313 connected to the bearing receiving part 312 inside the other side of the body 311 and having rollers 300 and 400 provided therein; In the roll chocks (310, 410) formed to include, the roll choke (310, 410) is connected to one side of the body support portion one or more side support (315) for supporting the roll choke (310, 410) ) Is formed to protrude, and a welding welding layer 500 is formed on the body support 314 or the side support 315.

In addition, the growth welding layer is formed by using a stainless steel electrode, more preferably SUS308, SUS309 and the like is preferably used to increase the wear resistance and corrosion resistance.

3 and 4 illustrate the work roll choke 310, the roll chocks 310 and 410 of the present invention include a support roll choke 410 in various modifications within the scope of the present invention. It is possible.

The rolling apparatus of the present invention is provided with a liner 200 provided to prevent corrosion and abrasion between the housing 100 and the housing 100, and provided in the housing 100 to be in contact with the rolling material 600. The work roll 300 (Work Roll), the support roll 400 (Back Up Roll) for supporting the work roll 300, and the support roll 400 are provided on both ends of the support roll 400 And a support roll choke 410 (Back Up Roll Chock) for operating the work roll, and a work roll choke 310 (Work Roll Chock) provided at both ends of the work roll 300 to operate the work roll 300. In the rolling apparatus 1000 is configured to, the roll choke is characterized in that the build-up welding (Build Up Welding) layer is formed in a portion in contact with the liner 200.

The liner 200 is formed between the housing 100 and a roll choke (work roll choke 310 and support roll choke 410 and between the roll choke and roll choke to prevent wear in the portion and roll choke As it is provided to guide the, liner 200 in the present invention means all the usual liner 200 provided in the rolling device 1000 including a hard liner (200).

5 is a perspective view showing the work roll 300 and the work roll choke 310 of the present invention, Figure 6 is a bottom perspective view of the work roll 300 and the work roll choke 310 shown in FIG. 5 and 6 are views related to the work roll 300 for operating the rolling rolls in direct contact with the rolling material 600, the growth welding layer 500 corresponds to the darkly marked portion.

Rolling apparatus 1000 of the present invention is formed by the growth welding layer 500 can significantly reduce the corrosion and abrasion of the part, even if the portion is worn, simply complete the repair by complementing the growth welding layer It is possible to extend the life of the roll choke (310, 410) is effective.

7 is a perspective view showing a support roll 400 and a support roll choke 410 of the present invention, wherein the support roll choke 410 is a component for operating the support roll 400 of the work roll choke 310. It is provided on the upper side and the lower side to support the work roll 300, and similar to the work roll choke 310, the welding welding layer 500 in the portion shown in bold in FIG. ) Is formed.

The corrosion resistance and wear resistance of the roll chocks including the work roll choke 310 and the support roll choke 410 of the present invention are formed in a high wear-prone portion in contact with the liner 200 to form a welding layer 500. It is preferable that the growth welding layer 500 is formed using a stainless steel electrode. SUS308, SUS309 may be used as the stainless steel electrode, and the growth welding layer 500 may be formed to improve corrosion resistance and wear resistance.

8 is a schematic view showing an embodiment of a roll choke production method of the present invention, the roll choke production method of the present invention in the manufacturing method of the roll choke provided in the rolling apparatus 1000, a) to produce a casting Casting step (Sa); b) to have a margin of 3 ~ 5mm based on the final product in the area where the liner 200 of the basic casting is not in contact, and a depth of 3 ~ 5mm relative to the final product in the area where the liner 200 is in contact Rough machining step (Sb) for roughing so that the groove is formed; c) forming a growth welding layer 500 to form a growth welding layer 500 in the groove (Sc); And d) finishing processing step of adjusting the dimensions by finishing the cast product on which the growth welding layer 500 is formed (Sd); Characterized in that it is prepared to include.

The casting step (Sa) is to produce a cast product that is the basis of the roll choke so that cracks or pores do not occur inside, and if necessary to satisfy the required mechanical strength through the annealing process (Annealing) May be performed.

The roughing step (Sb) is a step for forming a groove for forming the growth welding layer 500, and processing the other parts to satisfy the final numerical range, the liner 200 of the basic casting product is not in contact Considering the final finishing step in the part that does not have a margin of 3 ~ 5mm based on the final product, and processing to form a groove of 3 ~ 5mm depth based on the final product in the area where the liner 200 is in contact. Step.

The growth welding layer 500 forming step (Sc) is a step of forming a growth welding layer 500 having a height of 8 to 15 mm by using a stainless steel welding rod in a groove formed through the roughing processing step (Sb). to be.

In the growth welding layer 500 forming step (Sc), it is preferable to use a flux mixing wire welding method (MAG welding method) or a covering arc (ARC) welding method, and before the welding, the groove portion, which is a welding part, is preheated to 100 to 120 ° C, It is preferable to set the said welding interlayer temperature to 120-220 degreeC.

The finishing processing step (Sd) is a step of precision processing to meet the dimensions of the final product of the roll choke by finishing the cast product on which the growth welding layer 500 is formed.

The roll chocks are assembled to complete other components, including bearings 320 and 420.

9 is a schematic view showing another embodiment of the roll choke manufacturing method of the present invention, the roll choke manufacturing method of the present invention after the rough processing step (Sb) e) the non-destructive inspection of the rough processed product, the test result The quality judgment step (Se) of comparing the reference quality with the rough processed product may be further included.

The quality determination step (Se) is a step of comparing the reference quality of the product subjected to the rough machining step (Sb) in more detail ultrasonic inspection (UT) inspection using ultrasonic waves, which can determine the internal and surface defects, Magnetic particle inspection (MT) test using a ferromagnetic material may be performed.

If the determination result in the quality determination step Se does not reach the reference quality, after the quality determination step Se, f) arc-air gouging or grinding processing on the roughly processed groove surface is defective. Defect removal step (Sf) for removing the may be further included.

In addition, as shown in FIG. 9, the method for manufacturing the roll chocks of the present invention is heat-treated for 50 to 70 minutes at a temperature of 600 ± 25 ° C. after the growth welding layer 500 forming step (Sc). Stress relief step (Sg) may be further included.

On the other hand, the rolling apparatus 1000 of the present invention is characterized in that the roll chocks (310, 410) having a growth welding layer 500 is employed in a portion in contact with the liner 200 as described above.

The present invention is not limited to the above-described embodiments, and the scope of application is not limited, and various modifications can be made without departing from the gist of the present invention as claimed in the claims.

Accordingly, the roll choke, the manufacturing method and the rolling apparatus of the present invention which have high corrosion resistance and wear resistance have high mechanical properties by forming a build-up welding layer on the contact area of the roll choke with the liner and the housing, and prevent corrosion and wear. Significantly reduces the rolling performance and the quality of the final product has the effect of increasing the yield.

Claims (10)

delete delete In the manufacturing method of the roll choke provided in the rolling apparatus, a) a casting step of producing a casting that is the basis of the roll choke; b) roughing process to allow 3 ~ 5mm of margin to the part where the liner of the basic casting is not in contact with the final product, and to form a groove having a depth of 3 ~ 5mm based on the final product in the part where the liner is in contact with. Rough machining step; e) a quality judgment step of determining the quality of the rough processed product by non-destructive inspection of the rough processed product and comparing the inspection result with the reference quality; c) a growth welding layer forming step of forming and growing a growth welding layer having a height of 8 to 15 mm by using a stainless steel welding rod in the groove; g) a stress removing step of performing heat treatment for 50 to 70 minutes at a temperature of 600 ± 25 ° C. after step c); And d) finishing processing step of adjusting the dimensions by finishing the cast product on which the growth welding layer is formed; Method of producing a roll choke characterized in that it is prepared to include. delete The method of claim 3, wherein The manufacturing method of the roll choke If the result of the determination in step e) does not meet the criteria, after step e), f) Arc-Air Gouging or Grinding is performed on the rough grooved surface to remove defects. Defect removal step; Method for producing a roll choke characterized in that it further comprises. delete The method of claim 3, wherein The c) step is a method of manufacturing a roll choke, characterized in that using a flux mixing wire welding method (MAG welding method) or coated arc (ARC) welding method. The method of claim 7, wherein The step c) is a method of manufacturing a roll choke characterized in that the preheating of the welding portion to 100 ~ 120 ℃, the temperature between the welding layer is set to 120 ~ 220 ℃. delete delete

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