KR20190017468A - End coupling of spindle and this reinforcing method - Google Patents

Abstract

Provided are an end coupling of a spindle and a reinforcing method thereof, wherein an abrasion portion of the end coupling is reinforced to prevent vibration of a spindle to improve durability of facilities. Moreover, a reinforcing unit is connected to the spindle by a slipper metal pin, and is provided in a contact portion with the slipper metal pin. The reinforcing unit has a reinforcing layer provided by welding an austenitic aging stiffening material.

Description

[0001] END COUPLING OF SPINDLE AND THIS REINFORCING METHOD [0002]

A method of end-coupling and end-coupling reinforcement of a spindle in which a reinforcing layer is formed is disclosed.

In the rolling process, a slab produced by continuous casting is charged into a heating furnace and reheated to a high temperature, followed by a roughing mill and a finishing mill to produce a final rolled product.

During the hot rolling process, the power of the motor is transmitted to the rolling roller through a spindle, a slipper metal, and a coupling. The spindle connected to the motor and the coupling connected to the rolling roller are the main components of the power transmission of the hot rolling parts.

The spindle is a key component of the rolling mill drive system, and the spindle must be operated stably to produce a good quality product.

The spindle is a device for transmitting the power of the motor to the rolling roll, and an end coupling is assembled to the motor shaft and connected to the spindle shaft. The spindle shaft is provided with a spindle connection part connected to the end coupling to transmit power to the rolling roll.

The spindle is provided with a slipper metal at a connection portion thereof, and the slipper metal and the end coupling are connected to each other through a slipper metal pin.

During operation of the motor, vibration is applied to the end coupling, and abrasion occurs at the connection portion of the end coupling assembled with the slipper metal pin.

Abrasion also occurs in the slipper metal pin assembled with the wear of the end coupling. As a result, a clearance is generated between the end coupling and the slipper metal pin, and the spindle rotating is shaken in the axial direction of the spindle.

The vibration of the spindle is transmitted to the motor, and the motor is shaken to generate a torsional load, thereby damaging the rotor.

Since the above-mentioned wear of the end coupling makes it difficult to operate the facility stably, there is a limitation in producing high-quality products.

Since the entire end coupling of the end coupling is required to be replaced, productivity and economical efficiency are reduced due to shortening of the equipment life.

Further, since the end coupling of the spindle is normally covered with a dog house, it is difficult to check the wear state of the end coupling. It is also difficult to maintain and manage the end coupling because it takes a long time to perform the above-mentioned end-coupling exchange operation.

Accordingly, when the flow of the spindle is generated due to the progress of the wear of the end coupling, there is always a risk that a second large-scale facility accident may occur.

The end coupling of the spindle is reinforced by preventing the vibration of the spindle by reinforcing the wear of the end coupling, thereby improving the durability of the spindle.

The end coupling of the spindle includes a reinforcing portion connected to a spindle by a slipper metal pin and provided at a contact portion with the slipper metal pin, and the reinforcing portion includes a reinforcing layer formed by welding an austenitic-age- can do.

Wherein the reinforcing layer has a carbon (C) content of more than 0 and not more than 0.15 wt%, a silicon (Si) content of more than 0 and not more than 0.98 wt%, a manganese (Mn) content of more than 0 and not more than 7.5 wt%, a chromium (Cr) And more than 0 to 9.8 wt% of nickel (Ni), and further includes fine addition of molybdenum (Mo), nitrogen (N), boron (B), titanium (Ti) and the balance iron (Fe).

Manganese in the reinforcing layer is not less than 4 wt% and not more than 7.5 wt%, and carbon is not less than 0.06 wt% and not more than 0.08 wt%.

The reinforcing layer may further include molybdenum (Mo) having a content of 0.34 to 0.51 wt%.

The reinforcing portion may include an austenitic age-hardenable material, and may further include an additional reinforcing layer welded to the reinforcing layer.

Wherein the additional reinforcing layer contains carbon (C) in an amount of more than 0 to 0.15 wt%, silicon (Si) in an amount of more than 0 to 0.98 wt%, manganese (Mn) in an amount of more than 0 and not more than 7.5 wt%, chromium (Cr) (Ni): not less than 0 and not more than 9.8 wt%, and includes fine addition of molybdenum (Mo), nitrogen (N), boron (B), titanium (Ti) and the balance iron (Fe).

The manganese (Mn) in the additional reinforcing layer is 7 wt% or more, and the carbon (C) is 0.1 wt% or more.

The method for reinforcing an end coupling of a spindle includes forming a reinforcing portion in a wear portion of an end coupling, and the step of forming the reinforcing portion includes forming a reinforcing layer by welding an austenitic-age hardenable material to the wear portion ≪ / RTI >

The forming of the reinforcing portion may further include forming an additional reinforcing layer by welding an austenitic-age-hardenable material on the reinforcing layer.

The reinforcing portion forming step may further include a pre-heating step of pre-heating the wear portion of the end-coupling.

The wear-side preheating step of the end-coupling may be performed by disassembling the end-coupling in the apparatus and charging it into an electric furnace, and then heating the end-coupling, or end coupling assembled in the apparatus, And the wear portion of the ring is heated by the welding torch.

The pre-heating of the wear-side part of the end-coupling may maintain the pre-heating temperature for the end-coupling wear part in the range of 150 to 200 ° C.

The wear-side preheating step of the end-coupling may further comprise a warming step to prevent cooling of the wear-side surface of the end-coupling so that the pre-heating state of the end-coupling is maintained.

The reinforcing layer forming step may be performed within 4 hours after the pre-heating of the abrasion part of the end-coupling.

The wear and tear preheating step of the end-coupling may further include an additional preheating step of reheating the wear part by using a welding torch when the welding operation delay of the end-coupling wear part is delayed.

After completion of the welding work of the end-coupling wear part, the step of warming the reinforcement part by covering the insulator with the insulator is further included.

After completion of the welding work of the end-coupling wear part, the step of inspecting the reinforcing part of the end coupling and the step of re-welding the defect part of the reinforcing part of the end coupling that is not welded.

According to the present and the present invention, it is possible to reinforce the abrasion portion of the end coupling which is in contact with the slipper metal pin, thereby preventing wear of the end coupling. The wear of the end coupling can be prevented, and the durability of the mill equipment can be improved. It is possible to prevent the vibration of the spindle due to wear of the end coupling and prolong the lifetime of the mill equipment.

In addition, through the reinforcement method of the end coupling, it is possible to reduce the time and cost in the maintenance work of the equipment, thereby improving the productivity and reducing the cost.

1 is a view schematically showing a state where a reinforcement material is welded to an end coupling according to the present embodiment.
2 is a view schematically showing an assembled state of the end coupling according to the present embodiment.
3 is a view schematically showing a state in which a reinforcing member is welded to a wear portion of an end coupling according to the present embodiment.
4 is a view illustrating a process of reinforcing the end coupling of the spindle according to the present embodiment.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

1 is a view schematically showing a state where a reinforcement material is welded to an end coupling according to the present embodiment. 2 is a view schematically showing an assembled state of the end coupling according to the present embodiment.

As shown in Figs. 1 and 2, an end coupling 1 for transferring the power of the motor to the spindle of the rolling mill is assembled with the spindle connection portion 2. The end coupling 1 and the spindle connecting portion 2 are assembled by the slipper metal 3 and the slipper metal pin 4 assembled thereto. A wear part (A) is formed in a portion of the end coupling (1) where the slipper metal pin (4) is contacted.

In the present embodiment, an end coupling 1 having a reinforcing portion 5 for reinforcing a wear portion A of the end coupling 1 is formed.

The end coupling 1 having the reinforcing portion 5 formed on the wear portion A is in contact with the slipper metal pin 4 while being connected to the spindle connecting portion 2, And a body 10 formed thereon. The body 10 includes carbon (C), silicon (Si), manganese (Mn), chromium (Cr), nickel (Ni), and molybdenum (Mo).

The end coupling 1 includes a reinforcing portion 5 connected to the spindle connecting portion 2 by the slipper metal pin 4 and provided at a contact portion with the slipper metal pin 4, The reinforcing portion 5 may include a reinforcing layer 20 formed by welding an austenitic-age-hardenable material.

The reinforcing layer 20 to be welded to the wear portion A of the end coupling 1 may be welded to the powder by heat welding.

The reinforcing layer 20 may be formed of at least one of carbon (C), silicon (Si), manganese (Mn), chromium (Cr), nickel (Ni), molybdenum (Mo), nitrogen (N), boron ) And the balance iron (Fe). The age hardenability is a phenomenon in which the hardness of the alloy increases with the passage of time after the heat treatment.

The reinforcing portion 5 may further include an austenitic age-hardenable material and may further include an additional reinforcing layer 30 welded to the reinforcing layer 20.

The additional reinforcing layer 30 includes an austenitic age-hardening material containing carbon (C), silicon (Si), manganese (Mn), chromium (Cr), nickel (Ni), and the balance iron (Fe).

In addition, the main body 10 of the end coupling 1 hardens the mechanical structural steel (SCM440) and then processes it to heat the steel before grinding to improve its mechanical properties.

The main body 10 is made of a material which contains 0.037 wt% or less of carbon (C), 0.30 wt% or less of silicon (Si), 0.91 wt% or less of manganese (Mn) : 1.3 wt% or less and molybdenum (Mo): 0.14 wt% or less.

The main body 10 is subjected to a loosening process of maintaining the machined structural steel at 860 DEG C for 12 hours and 30 minutes, then cooling it in the air to remove the internal stress and uniformize the texture.

The mechanical structural steel is then quenched at 860 ° C for 7 hours and 30 minutes to cool in oil. The quenching process is followed by quenching to increase the hardness of the mechanical structure steel.

The reinforcing portion 5 constituting the reinforcing layer 20 and the additional reinforcing layer 30 is hardened by forging steel or hardened alloy steel subjected to quenching treatment. The reinforcing portion 5 is highly resistant to an impact load, and particularly excellent in weldability of dissimilar metals and excellent in abrasion resistance, impact resistance, abrasion resistance and weldability.

The reinforcing portion 5 is welded to the wear portion A of the end coupling 1 by using the welding rod 7 (see FIG. 3), thereby reinforcing the end coupling 1. The reinforcing portion 5 includes a reinforcing layer 20 formed on the surface of the worn portion A and an additional reinforcing layer 30 formed on the surface of the reinforcing layer 20.

In the present embodiment, the reinforcing layer 20 constituting the reinforcing portion 5 has a carbon (C) content of more than 0 to 0.15 wt%, a silicon (Si) content of more than 0 to 0.98 wt%, a manganese (Mn) content of more than 0 (Ni), nitrogen (N), boron (B), titanium (Ti), and titanium (Ti) ) And the remainder iron (Fe). The reinforcing layer 20 is formed through a breaching process on the wearable portion A of the end coupling 1.

Manganese in the reinforcing layer is not less than 4 wt% and not more than 7.5 wt%, and carbon is not less than 0.06 wt% and not more than 0.08 wt%. The reinforcing layer may further include molybdenum (Mo) having a content of 0.34 to 0.51 wt%.

The additional reinforcing layer 30 constituting the reinforcing portion 5 has a carbon (C) content of more than 0 to 0.15 wt%, a silicon (Si) content of more than 0 to 0.98 wt%, a manganese (Mn) (Mo), nitrogen (N), boron (B), titanium (Ti), or the like, Fine addition and residual iron (Fe).

The additional reinforcing layer 30 is very excellent in strength at high temperature, impact and friction, shock absorbing property and aging hardening property. The manganese (Mn) in the additional reinforcing layer is 7 wt% or more, and the carbon (C) is 0.1 wt% or more.

The reinforcing layer 20 and the additional reinforcing layer 30 are compared with the test steels and are shown in Table 1 as follows.

division C
weight% Si
weight% Mn
weight% Cr
weight% Ni
weight% Impact resistance aging The tensile strength Remarks Reinforced layer 0.15
weight% 0.98
weight% 7.5
weight% 21
weight% 9.8
weight% Extremely
Good Very good Very good Shock resistance,
Aging hardening Additional stiffening layer 0.15
weight% 0.98
weight% 7.5
weight% 21
weight% 9.8
weight% Extremely
Good Extremely
Good Good Shock resistance,
Aging hardening Test River 1 0.06
weight% 0.65
weight% 3.1
weight% 19.5
weight% 6.5
weight% usually none usually Corrosion resistance Test River 2 0.061
weight% 0.50
weight% 3.5
weight% 23
weight% 6.0
weight% usually none usually Corrosion resistance Test River 3 0.11
weight% 0.34
weight% 2.5
weight% 11
weight% 6.8
weight% usually none usually

Test steel 1 to test steel 3 contained 0.06 to 0.11 wt% of carbon (C), 0.34 to 0.65 wt% of silicon (Si), 2.5 to 3.5 wt% of manganese (Mn) (Ni), 6.0 to 6.8 weight% of nickel (Ni), nitrogen (N), boron (B) and titanium (Ti) It is a ferrite material. The test steels were found to have poor age hardening properties and poor strength at high temperatures.

On the other hand, the reinforcing portion 5 of the present embodiment is an austenitic material mainly composed of manganese, chrome, and nickel welded to the locally worn portion A of the end coupling 1 of the spindle connecting portion 2. By using an age hardening material as the reinforcing portion 5, physical properties of high impact resistance, high hardness, and high tensile strength can be secured.

This makes it possible to improve the wear resistance and elongation rate even under the condition of impacting the wear portion A of the end coupling 1 and to reduce the wear caused by the contact between the end coupling 1 and the slipper metal pin 4 Can be extremely limited.

Further, after the welding of the reinforcing portion 5, the welded structure changes into the martensite structure by quenching, and the welded structure is hardened, whereby the welded portion can be prevented from falling out in the form of a piece simultaneously with the crack.

3 is a view schematically showing a state in which a reinforcing member is welded to a wear portion of an end coupling according to the present embodiment. 4 is a view illustrating a process of reinforcing the end coupling of the spindle according to the present embodiment.

As shown in Figs. 3 and 4, the method for reinforcing the end coupling of the spindle can be carried out in two ways.

First, after the end coupling 1 is completely disassembled from the spindle connecting portion 2 of the rolling mill, the end coupling 1 is preheated in the electric furnace, and then the wear portion of the end coupling 1 A is welded to the reinforcement portion 5.

Secondly, a dog house covering the end coupling 1 is opened without removing the end coupling 1 from the spindle connecting portion 2 of the rolling mill. The dog house is a lid covering the connection of the spindle and the end coupling (1).

After pre-heating the worn portion A of the end-coupling 1, the reinforcing portion 5 is welded to the worn portion A of the end coupling 1 at the site where the rolling mill is installed.

That is, the reinforcement method of the end coupling 1 is carried out by preheating the abrasion portion A of the end coupling 1 to the wear portion A of the end coupling 1, A step S2 of forming a reinforcing portion 5 by welding a curable material and a step S3 of finishing the welding work by grinding the surface of the reinforcing portion 5 of the end coupling 1 have.

The step of forming the reinforcing portion S2 includes the step of forming the reinforcing portion 5 in the wear portion A of the end coupling 1 and the step of forming the reinforcing portion 5 includes a step And forming a reinforcing layer 20 (see FIG. 1) by welding the base material to the wear-resistant portion A.

And further forming an additional reinforcing layer 30 (see FIG. 1) by welding an austenitic-age-hardening material on the reinforcing layer 20.

The wear-and-light preheating step S1 of the end-coupling is performed by disassembling the end-coupling 1 in the apparatus and charging it into an electric furnace, and then heating the end-coupling 1, The wear part A of the end coupling 1 is heated by the welding torch in a state in which the spindle 2 and the spindle 2 (see Fig. 2) are disassembled.

The pre-heating step (S1) of the wear-side part of the end-coupling can maintain the pre-heating temperature of the wear part (A) of the end-coupling (1) within the range of 150 to 200 ° C.

The preheating during the welding and the temperature management between the reinforcing layer layers should be maintained in the range of 150 to 200 ° C. The reason for this is that the optimal preheat temperature is 400 to 500 ° C. at the starting point of martensite of 310 ° C. and the end point of 140 ° C. of the mechanical structural steel (SCM440), but deformation generation and preheating are practically impossible. At around 300 ° C there is a brittle embrittlement band, and below 140 ° C cracks are expected to occur in the martensitic structure.

Thus, in the temperature range of 150 to 200 占 폚, the metal structure forms austenite, bainite and martensite. The end coupling (1) requires a total preheating (time required for 10 hours) at a temperature in the range of 150 to 200 ° C in an electric furnace.

The heated end coupling 1 as described above is moved to the workplace and the welding operation of the wear part A proceeds. At this time, it further includes a warming step for preventing the surface of the wear part (A) of the end coupling (1) from being cooled so that the pre-heating state of the end coupling (1) is maintained.

In order to prevent the cooling of the wear part (A) of the end coupling (1) preheated in the above-mentioned end-coupling wear part warming step, the wear part (A) is welded within 4 hours after the work of the end coupling Can be performed.

The wear and tear preheating step S1 of the end coupling further includes an additional preheating step of reheating the worn portion A using a welding torch when the welding operation of the end coupling 1 is delayed can do.

The preheating process can be directly carried out on the wear part A by using the welding torch 6 when the welding operation delay of the end coupling part 1 is made.

In other words, the end coupling (1) transferred to the worksite advances the welding operation within 4 hours so that the preheated state is not cooled. If the welding operation is delayed, a preheating process may be added to the wear portion (A) of the end coupling (1) with the welding torch (6). After completion of the welding work of the end-coupling (1) wear part (A), it may further comprise a step of slowly cooling the reinforcing layer by covering the reinforcing layer of the wear part (A) with a heat insulating material.

After finishing the welding of the reinforcing layer to the wear part (A) of the end coupling (1), the defect part of the welding part is inspected and the defect part is re-welded. After the hardness of the welded portion is inspected and the regenerated welded portion is smoothly worked, the non-destructive inspection is carried out. Thus, the reinforcing process of the wear-resistant portion A is completed.

On the other hand, when the wear part A of the end coupling 1 is reinforced in the field, the dog house of the end coupling 1 assembled into the device is opened, and then the end coupling 1 and the spindle are disassembled The worn portion A of the end coupling 1 is heated by the welding torch 6. [

The temperature of the welding torch 6 which heats the wear portion A of the end coupling 1 in the end-coupling preheating step S1 may be in the range of 150 to 200 占 폚.

The reinforcing welding operation is carried out by using the welding torch 6 and the welding electrode 7 having a reinforcing material in the worn portion A of the preheated end coupling 1.

Since the surface of the worn portion A completed the welding operation is not smooth, the surface of the reinforcing layer is polished using a grinder in the welding operation finishing step.

Therefore, it is possible to easily carry out the reinforcement work in the field without the need to completely disassemble the end coupling 1.

Component  And composition range

Hereinafter, the component system and the range of components of the end-coupling 1 reinforcing material according to the embodiment of the present invention will be described.

Carbon (C): more than 0 and not more than 0.15% by weight

Carbon (C) is the most effective and important element in increasing the strength of steel. Carbon (C) is dissolved in austenite to form martensite structure during quenching. Carbon (C) combines with elements such as iron, chromium, molybdenum, and vanadium to form carbides to improve strength and hardness. On the other hand, if the content of carbon (C) exceeds 0.15% by weight, there is a problem that the possibility of deformation during quenching may be increased.

More specifically, the content of carbon (C) may be 0.07 or more.

manganese( Mn ): More than 0 and not more than 7.5% by weight

Manganese (Mn) improves the yield strength of carbon steel by adding finer pearlite and enhancing solubility of ferrite when added. The addition of manganese (Mn) can improve the curing performance during quenching in austenite. On the other hand, if the content of manganese (Mn) exceeds 7.5% by weight, there is a problem that cracking and warping may be increased during quenching.

More specifically, it may be 4.0% or more or 6.4% or more.

silicon( Si ): More than 0 and not more than 0.98% by weight

Since silicon (Si) is used as a deoxidizer, it forms silicon dioxide (SiO2) or silicate and has little effect on the mechanical properties of the material. Silicon (Si) is a strong deoxidizer, and the strength of the material can be improved.

Silicon (Si) also has the effect of increasing softening resistance during tempering. On the other hand, when the content of silicon (Si) exceeds 0.98% by weight, the process compound is excessively precipitated and the crack resistance is lowered.

More specifically, the content of silicon (Si) may be 0.7% or more.

nickel( Ni ): More than 0 and not more than 9.8 wt%

Nickel (Ni) is the most important and common element for alloying with chromium. Nickel (Ni) is used to reinforce the matrix because it fine-grained the steel structure and is well employed in austenite and ferrite. When the nickel (Ni) coexists with chromium (Cr) or molybdenum (Mo), it exhibits excellent curing performance and can easily heat treat the large steel. On the other hand, if the content of nickel (Ni) exceeds 9.8 wt%, the viscosity of the welded portion excessively increases, resulting in the problem of pores and insufficient penetration.

More specifically, the content of nickel (Ni) may be 9.0% or more.

chrome( Cr ): More than 0 and not more than 21% by weight

Chromium expands the austenite region and forms carbides that do not cause brittleness even in large quantities. The chromium improves the oxidation resistance and the sulfidation resistance, and therefore is the most common alloy element contained in almost all of structural steel, tool steel, stainless steel, and heat resistant steel. On the other hand, when the content of chromium (Cr) exceeds 21% by weight, ferrite and chromium carbide are formed at a high temperature, and toughness is lowered.

More specifically, the content of chromium (Cr) ranges from 17.8 to 20.5% by weight.

molybdenum( Mo ): 0.34 to 0.51 wt%

Since molybdenum (Mo) forms carbide, it shows an excellent effect as an alloying element of an advanced cutting tool and raises the grain coarsening temperature. Molybdenum (Mo) may be more effective when used in combination with chromium (Cr) to improve hardenability. On the other hand, if the content of molybdenum (Mo) exceeds 0.51% by weight, the precipitation of the molybdenum (Mn) -based carbide causes a decrease in impact toughness at low temperature and high temperature, resulting in a decrease in ductility.

More specifically, the content of molybdenum (Mo) ranges from 0.34 to 0.51% by weight.

Therefore, the reinforcing material for reinforcing the abraded portion A of the end coupling 1 is austenitic-based and has a structure in which impact resistance and hardening resistance are dense. Further, the reinforcing material is effective for joining and cultivating alloy steels, chrome steels, manganese steels, heat treated steels and general steels that require excellent tensile strength and elongation. The reinforcing material also has an effect of improving the hardness by mechanical abrasion. The reinforcing material has a hardness of 25 SIMILAR 30 HS after welding and a hardness of 36 SIMILAR 47 SIMILAR when used.

While the illustrative embodiments of the present invention have been shown and described, various modifications and alternative embodiments may be made by those skilled in the art. Such variations and other embodiments will be considered and included in the appended claims, all without departing from the true spirit and scope of the invention.

1: End coupling 2: Spindle connection
3: Slipper metal 4: Slipper metal pin
5: reinforcement part 6: welding torch
7: welding rod 10:
20: reinforcing layer 30: additional reinforcing layer
A: Wear portion

Claims (17)

And a reinforcing portion connected to the spindle by a slipper metal pin and provided at a contact portion with the slipper metal pin,
Wherein the reinforcing portion includes a reinforcing layer formed by welding an austenitic age-hardenable material. The method according to claim 1,
Wherein the reinforcing layer has a carbon (C) content of more than 0 and not more than 0.15 wt%, a silicon (Si) content of more than 0 and not more than 0.98 wt%, a manganese (Mn) content of more than 0 and not more than 7.5 wt%, a chromium (Cr) And nickel (Ni): more than 0 and not more than 9.8 wt%
And coupling of spindle containing fine addition of molybdenum (Mo), nitrogen (N), boron (B), titanium (Ti) and the remainder iron (Fe). 3. The method of claim 2,
Wherein the manganese in the reinforcing layer is not less than 4 wt% and not more than 7.5 wt%, and the carbon is not less than 0.06 wt% and not more than 0.08 wt%. 3. The method of claim 2,
Wherein the reinforcing layer further comprises molybdenum (Mo) having a content of 0.34 to 0.51 wt%. The method according to claim 1,
Wherein said reinforcing portion comprises an austenitic age-hardenable material and further comprises a further reinforcing layer welded to said reinforcing layer. 5. The method of claim 4,
Wherein the additional reinforcing layer contains carbon (C) in an amount of more than 0 to 0.15 wt%, silicon (Si) in an amount of more than 0 to 0.98 wt%, manganese (Mn) in an amount of more than 0 and not more than 7.5 wt%, chromium (Cr) And Ni (Ni): more than 0 and not more than 9.8 wt%
And coupling of spindle containing fine addition of molybdenum (Mo), nitrogen (N), boron (B), titanium (Ti) and the remainder iron (Fe). The method according to claim 6,
Wherein the manganese (Mn) in the additional reinforcing layer is at least 7 wt% and the carbon (C) is at least 0.1 wt%. And forming a reinforcing portion in the wear portion of the end coupling,
The step of forming the reinforcing portion includes welding an austenitic-age-hardenable material to the abrasive portion to form a reinforcing layer. 9. The method of claim 8,
Wherein the forming of the reinforcing portion further comprises forming an additional reinforcing layer by welding an austenitic-age-hardening material on the reinforcing layer. 9. The method of claim 8,
Wherein the step of forming the reinforcing portion further includes a step of pre-heating the wear portion of the end coupling. 11. The method of claim 10,
The wear-side preheating step of the end-coupling may be performed by disassembling the end-coupling in the apparatus and charging it into an electric furnace, and then heating the end-coupling, or end coupling assembled in the apparatus, And the worn portion of the ring is heated by a welding torch. 12. The method of claim 11,
Wherein the wear and tear preheat step of the end coupling maintains the preheat temperature of the end-coupling wear part in the range of 150 to 200 占 폚. 12. The method of claim 11,
Wherein the wear-side preheating step of the end-coupling further comprises a warming step to prevent cooling of the wear-side surface of the end-coupling so that the pre-heating state of the end-coupling is maintained. 11. The method of claim 10,
Wherein the reinforcing portion forming step is performed within 4 hours after the pre-heating of the abrasion portion of the end coupling. 12. The method of claim 11,
Wherein the wear-and-wear preheating step of the end-coupling further comprises an additional preheating step of reheating the wear part using a welding torch when the welding operation delay of the end-coupling wear part is reheated. 9. The method of claim 8,
Further comprising the step of gradually cooling the reinforcing portion by covering the reinforcing portion with a thermal insulating material after completion of the welding work of the end-coupling wear portion. 17. The method of claim 16,
Further comprising the step of inspecting the reinforcing portion of the end coupling after completion of the welding work of the end-coupling wear portion and re-welding the defect portion of the welded portion of the reinforcing portion of the end coupling. Way.

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