KR20200137321A - Copper-Chromium Journal Bearing Manufacturing Method Using Centrifugal Casting and Journal Bearing Manufactured Using It - Google Patents

Abstract

The present invention provides a copper-chromium journal bearing manufacturing method using centrifugal casting and a journal bearing manufactured by using the same, in which copper-chromium is applied as a base metal of a journal bearing applied to a steam turbine for combined cycle power generation, so that the performance of the bonding between the base metal and a Babbit metal is enhanced to provide high strength. That is, the present invention is configured mainly by comprising a degreasing step (S1), a masking step (S2), a descaling step (S3), a fluxing step (S3), a fluxing step (S4), and a first tinning step (S5), a water cooling step (S6), a second tinning step (S7), and a centrifugal casting step (S8). According to the copper-chromium journal bearing manufacturing method using centrifugal casting, after the casting surface of the base metal has sequentially undergone the degreasing step, the descaling step, and the fluxing step, the first and second tinning steps are performed thereto in stages, so that the quality of tinning is improved, thereby improving castability according to centrifugal casting. Specifically, as a cooling condition is set with reference to a centrifugal casting condition in a centrifugal casting step, the performance of the bonding between the base metal and the Babbit metal is enhanced to have high strength of 70 N/mm2 or more. Therefore, there is an advantage that the performance of the journal bearing is improved, and the life expectancy thereof is also extended to be much longer under the condition of a high speed and a heavy load.

Description

[Copper-Chromium Journal Bearing Manufacturing Method Using Centrifugal Casting and Journal Bearing Manufactured Using It}

The present invention relates to a method of manufacturing a chrome copper journal bearing using centrifugal casting and a journal bearing manufactured using the same.If this is described in more detail, the centrifugal casting method while applying the base metal of the journal bearing applied to the combined power generation steam turbine with chrome copper Bonding between Babit metals by 70 N/mm ² It relates to a method for manufacturing a chrome copper journal bearing using centrifugal casting that can be reinforced with the above bonding strength, and a journal bearing manufactured using the same.

In general, industrial rotating machines such as compressors and generators are increasing in speed and in size with the demand for efficiency improvement, and accordingly, the application of tilting pad journal bearings having excellent load bearing capacity and high speed stability is increasing. The journal bearing of the tilting pad is a bearing in which several pads located in the circumferential direction can rotate around a pivot.

In recent years, as the application of the tilting pad journal bearing increases in industrial sites, various types of failures related to the tilting pad journal bearing have also been reported. One of the most frequently reported phenomena related to the failure of the tilting pad journal bearing is the weak debonding phenomenon, which means bonding between the base metal and the Babbit metal. When debonding occurs, it causes fatal damage to the entire power generation facility. Therefore, centrifugal casting technology and improved bonding with base metal are inevitable for improving the performance of journal bearings.

Thus, in the conventionally disclosed registration number 10-0839183, the first step of selecting a material for the thrust bearing, and after the first step, the thrust bearing body is provided with a pivot capable of being detached and attached, and the material is first roughed. A second step of first manufacturing a pivot and a third step of dehydrogenating the first manufactured thrust bearing body and pivot by heat treatment by the first roughing of the second step, and the thrust dehydrogenated through the third step. The fourth step of the secondary roughing of the bearing body and the pivot, solvent cleaning, alkaline cleaning, and pickling to clean the thrust bearing body and pivot that have been subjected to the secondary roughing. The fifth step of performing the pretreatment process including the process and the fluxing process, and the tinning process of tinting the thrust bearing body and the pivot subjected to the pretreatment of the fifth step on the bavitting surface are performed. The sixth step of performing the bavitting process of applying babiting metal to the babiting surface of the thrust bearing body on which the tinning process of the sixth step is completed, and the thrust bearing in which the babiting process of the seventh step is completed After intermediate cutting of the body and the pivot, the thrust to which the pivot is assembled by assembling the pivot through the pivot assembly bolt in the state where the bearing shim is interposed in the thrust bearing body in which the eighth and eighth steps are completed. Pre-registered technology including the ninth step of manufacturing the bearing, finishing machining, and performing PT inspection, and the tenth step of performing dimensional inspection on the thrust bearing that has been completed in the ninth step, and rust prevention with TECTYL506 material. It has been done.

In registration number 10-0839182, which is another conventional technology, a thrust bearing body made of SS400 material and formed with babit metal on one side, and a bearing shim on the other side of the thrust bearing body are assembled through a pivot assembly bolt. It includes a pivot, and if the pivot assembled on the thrust bearing body is worn, it can be corrected by adjusting the thickness of the bearing shim disposed on the lower end of the pivot. If the wear is severe, only the pivot can be disassembled and replaced. The technology that can be used has been previously registered.

However, in the prior art, as the bearing body, that is, the base metal, is formed of general structural rolled steel (SS400), durability was not secured under high speed and high load conditions, resulting in fatal damage to the entire power generation facility. The bonding of is low to 45 N/mm ² or less, and in particular, the bonding due to the centrifugal casting method is deteriorated.

KR 10-0839183 B1 (2008.06.11.) KR 10-0839182 B1 (2008.06.11.)

Accordingly, the present invention was conceived to solve the above problems, and the base metal was formed of chromium copper (Copper-Chromium) to improve mechanical strength, while the base metal cast surface was subjected to a degreasing step, a decleaning step, and a fluxing step. After passing through successively, it is a problem of the present invention to provide a method of manufacturing a journal bearing in which the tin plating quality is improved by performing the first and second tinning steps in stages to improve bonding and castability according to centrifugal casting.

In addition, since the bonding between the base metal and the babit metal is reinforced with a bonding strength of 70 N/mm ² or more, a method of manufacturing a chrome copper journal bearing using centrifugal casting that improves the performance of the journal bearing and prolongs its life under high speed and high load conditions. And it is an object to provide a journal bearing manufactured using the same.

In order to achieve this object, a feature of the present invention is a degreasing step (S1) of immersing the base metal material 10 processed with the circular cast surface 12 therein in an alkaline cleaning bath; After the degreasing step (S1), a masking step (S2) of applying a release agent 14 to the non-cast surface of the base metal material 10; A pretreatment step of the cast surface of brushing an acidic washing solution or an aqueous chloride solution on the cast surface 12 of the base metal material 10; Thereafter, a first tinning step (S5) of immersing the base metal material 10 in a tin bath containing liquid tin to form the primary tin plating layer 20; A water cooling step (S6) of injecting the base metal material 10 that has undergone the first tinning step (S5) into a cooling tank and cooling it; After the water cooling step (S6), a second tinning step (S7) of immersing the base metal material 10 in a tin bath containing liquid tin to form a secondary tin plating layer (20'); And centrifugal casting in which the base metal material 10 that has undergone the second tinning step (S7) is put into a centrifugal casting machine, and a babit metal layer 30 is formed on the base metal material 10 casting surface 12 by a centrifugal casting method. It characterized in that it comprises a; step (S8).

The pretreatment step of the casting surface includes a de-cleaning step (S3) of brushing an acidic washing solution on the casting surface 12 of the base metal material 10, and a chlorinated aqueous solution on the casting surface 12 of the base metal material 10. It characterized in that it consists of a fluxing step (S4) of brushing.

At this time, the base metal material 10 is characterized in that it is formed of chromium copper containing 0.5 to 1 part by weight of chromium (Cr) based on 100 parts by weight of copper (Cu).

In addition, in the dehydration step (S3), brushing the acidic washing solution preheated to 25 to 35°C on the casting surface 12 of the base metal material 10 for 3 to 5 minutes, and washing with water after 3 to 5 minutes. It is characterized.

In addition, in the fluxing step (S4), a chlorinated aqueous solution containing 20 to 30% by weight of ZnCl on the cast surface 12 of the base metal material 10 is preheated to 40 to 50°C, followed by brushing for 3 to 5 minutes. Characterized in that.

In addition, the first tinning step (S5) is performed for 90 to 100 minutes in a tin bath at a temperature condition of 310 to 320°C, and then the second tinning step (S7) is performed at a temperature condition of 310 to 315°C. It is characterized by being performed for 130 to 150 minutes in a bath (tin bath).

In addition, in the centrifugal casting step (S8), a cooling time of 15 to 20 minutes is set with a cooling water of 25 to 30° C. under conditions of a Babbitt metal material injection temperature of 280 to 290°C and a rotation speed of the centrifugal casting machine of 285 to 295 rpm, and The temperature is characterized in that it is set to 410 ~ 420 ℃.

According to a specific means for solving the above-described problem, the present invention is a base metal is formed of chromium copper, excellent electrical conductivity and can improve the mechanical strength of the bearing,

After the base metal cast surface goes through a degreasing step, a decleaning step and a fluxing step in succession, the first and second tinning steps are performed step by step to improve the tin plating quality, thereby improving castability according to centrifugal casting.

In particular, as the cooling conditions are set based on the centrifugal casting conditions in the centrifugal casting step, the bonding between the base metal and the babbitt metal is reinforced with a bonding strength of 70 N/mm ² or more, improving the performance of journal bearings and life under high speed and high load conditions. This prolonged and prolonged effect is a great invention.

1 is a flow chart schematically showing a method of manufacturing a chrome copper journal bearing using centrifugal casting according to an embodiment of the present invention.
2 is a photograph showing a degreasing step of a method for manufacturing a chrome copper journal bearing using centrifugal casting according to an embodiment of the present invention.
3 is a photograph showing a masking step of a method for manufacturing a chrome copper journal bearing using centrifugal casting according to an embodiment of the present invention.
Figure 4 is a photograph showing a decleaning step of the method for manufacturing a chrome copper journal bearing using centrifugal casting according to an embodiment of the present invention.
5 is a photograph showing the fluxing step of a method for manufacturing a chrome copper journal bearing using centrifugal casting according to an embodiment of the present invention.
6 is a photograph showing a first tinning step of a method for manufacturing a chrome copper journal bearing using centrifugal casting according to an embodiment of the present invention.
7 is a photograph showing a water cooling step of a method for manufacturing a chrome copper journal bearing using centrifugal casting according to an embodiment of the present invention.
8 is a photograph showing a second tinning step of a method for manufacturing a chrome copper journal bearing using centrifugal casting according to an embodiment of the present invention.
9 is a photograph showing a centrifugal casting step of a method for manufacturing a chrome copper journal bearing using centrifugal casting according to an embodiment of the present invention.
10 is a block diagram showing a cross-sectional structure of a journal bearing manufactured using a method for manufacturing a chrome copper journal bearing using centrifugal casting according to an embodiment of the present invention.
11 is a test report showing the bonding of a journal bearing manufactured using a method for manufacturing a chrome copper journal bearing using centrifugal casting according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The terms about, substantially, etc. of the degree used in the present specification are used at or close to the numerical value when manufacturing and material tolerances specific to the stated meaning are presented, and are accurate to aid understanding of the present invention. Absolute numbers are used to prevent unfair use of the stated disclosure by unconscionable infringers.

1 is a flowchart schematically showing a method of manufacturing a chrome copper journal bearing using centrifugal casting according to an embodiment of the present invention.

The present invention relates to a method of manufacturing a chromium copper journal bearing using centrifugal casting, which is formed of chromium copper as a base metal, which is excellent in electrical conductivity and improves mechanical strength, while the base metal cast surface is degreasing step, derusting step and floc. After going through the sinking step in succession, the tin plating quality is improved by performing the first and second tinning steps in stages to improve the bonding according to the centrifugal casting.In particular, the cooling conditions are set based on the centrifugal casting conditions in the centrifugal casting step. Accordingly, since the bonding between the base metal and the babit metal is reinforced with a bonding strength of 70 N/mm ² or more, the degreasing step (S1) and the masking step ( S2), dehydration step (S3), fluxing step (S3), fluxing step (S4), first tinning step (S5), water cooling step (S6), second tinning step (S7), centrifugal casting step (S8) ).

1. DE-GREASING step

The degreasing step (S1) according to the present invention is a step of immersing the base metal material 10 on which the circular cast surface 12 is processed in an alkaline cleaning bath.

In the degreasing step (S1), the base metal material 10 is immersed in an alkaline washing bath at 70 to 80° C. for 30 to 40 minutes, and then washed with water (WATER RINSE). As shown in Fig. 2 (a), the base metal material 10 is put into an alkaline washing tank with the outer circumferential surface clamped to the crane clamp, and after being immersed for 30 to 40 minutes, it is moved to the washing room as shown in Fig. 2 (b) and sprayed through the nozzle. After washing with the washing water and drying, the masking step (S2) to be described later is performed.

Here, in the degreasing step (S1), foreign substances including oil remaining during the cutting process of the base metal material 10 are removed, so that adhesion improvement according to the application of the release agent 14 in the masking step (S2) to be described later, and will be described later. In the first and second tinning steps (S5) (S7), the plating quality of the tin plating layer is improved.

At this time, the base metal material 10 is formed of chromium copper containing 0.5 to 1 parts by weight of chromium (Cr) based on 100 parts by weight of copper (Cu), and is a circular tube so that the inner and outer circumferential surfaces are concentrically aligned by cutting. Is formed in a shape. The journal bearing according to the present invention supports the rotor of the turbine, and since the base metal material 10 is formed of chromium copper, an alloy for precipitation hardening, it has excellent electrical conductivity and safety due to high mechanical strength and high temperature and high pressure rotor operation. Is secured.

2. Masking step

The masking step (S2) according to the present invention is a step of applying a release agent 14 to the non-cast surface of the base metal material 10 after the degreasing step (S1). The masking step (S2) is performed on the casting surface on which the babit metal is formed in the centrifugal casting step (S8) to be described later, that is, the area (outer circumferential surface and side cross-section) excluding the circular cast surface 12 of the base metal material 10 as shown in FIG. 3. Is applied.

Accordingly, while performing the first and second tinning steps (S5) (S7) to be described later, the area except for the circular cast surface 12 of the base metal material 10 is masked so that the non-plated area of the tin plated layer is separated, In the first and second tinning steps S5 and S7 to be described later, the tin plating layer plated on the non-plated region is easily peeled off. Accordingly, after the centrifugal casting step (S8) to be described later, the post-process according to the outer peripheral surface treatment of the base metal material 10 is simplified.

3. DE-RUSTING step

The decleaning step (S3) according to the present invention is a step of brushing an acidic cleaning solution on the cast surface 12 of the base metal material 10.

In FIG. 4, in the de-cleaning step (S3), the cast surface 12 of the base metal material 10 is brushed with an acidic washing solution containing hydrochloric acid, and after 3 to 5 minutes, a water rinse is performed. At this time, the acidic washing solution is preheated to 25 to 35 °C and brushed for 3 to 5 minutes.

Since foreign matter including rust is removed from the cast surface 12 of the base metal material 10 through the de-cleaning step (S3), the babbitt metal layer 30 formed by the centrifugal casting step (S8) A phenomenon in which the bonding force with the base metal material 10 and the cast surface 12 is decreased due to the occurrence of rust and foreign matter is prevented.

4. Fluxing step

The fluxing step (S4) according to the present invention is a step of brushing an aqueous chloride solution on the cast surface 12 of the base metal material 10.

As shown in FIG. 5, the fluxing step (S4) is performed by preheating a chlorinated aqueous solution containing 20 to 30% by weight of ZnCl on the cast surface 12 of the base metal material 10 to 40 to 50°C for 3 to 5 minutes. Brush it.

Accordingly, the casting surface 12 of the base metal material 10 is surface-treated with an aqueous chloride solution to improve the plating quality of the tin plating layer in the first and second tinning steps S5 and S7 described later.

In this way, before the base metal material 10 performs the first and second primary tining steps (S5) (S7) and centrifugal casting steps (S8) to be described later, that is, a babit metal layer on the casting surface 12 ( 30), the casting surface pretreatment process including the DE-RUSTING step (S3) and the fluxing step (S4) is performed in combination, so bonding is strengthened when the babit metal layer 30 is formed. .

5. PRIMARY TINNING step

In the first tinning step (S5) according to the present invention, after the fluxing step (S4), the base metal material 10 is immersed in a tin bath containing liquid tin to form the first tin plating layer 20 ) Is formed.

In FIG. 6, the first tinning step (S5) is performed for 90 to 100 minutes in a tin bath at a temperature of 310 to 320°C, and immersed in the tin bath compared to the second tinning step (S7) to be described later. As a preliminary teaning step in which time is kept short, the primary tin plating layer 20 is plated to a uniform thickness on the cast surface 12 of the base metal material 10.

At this time, when the teaning time is set to less than 90 minutes in the first tinning step (S5), a non-plated area is generated, and when it exceeds 100 minutes, the thickness of the tin plated layer 20 for each area of the cast surface 12 of the base metal material 10 Since the deviation causes the plating quality to deteriorate, the first tinning step (S5) is preferably performed at 310 to 320°C for 95 minutes.

6. Water cooling step

The water cooling step (S6) according to the present invention is a step of cooling by introducing the base metal material 10 that has undergone the first tinning step (S5) into a cooling tank.

Here, in the water cooling step (S6), the base metal material 10 that has undergone the first tinning step (S5) is added to the cooling tank in which the cooling water is stored at 25 to 30° C. and cooled for 15 to 25 minutes. In addition to the cooling hardening of the plating layer 20, the plating treatment efficiency of the secondary tin plating layer 20 ′ is improved in the second tinning step S7 to be described later.

On the other hand, after passing through the water cooling step (S6), the casting surface 12 of the base metal material 10 is inspected to select the plating defects of the primary tin plating layer 20, so after going through the centrifugal casting step (S8) The defective rate of finished products due to poor bonding with the babit metal layer 30 is significantly reduced.

7. SECONDARY TINNING step

In the second tinning step (S7) according to the present invention, after the water cooling step (S6), the base metal material 10 is immersed in a tin bath containing liquid tin to form a secondary tin plating layer 20' ) To form.

In FIG. 8, the second tinning step (S7) is a main teaning step performed for 130 to 150 minutes in a tin bath at a temperature of 310 to 315°C, which is formed through the first tinning step (S5). A secondary tin plating layer 20 ′ is formed on the primary tin plating layer 20 in an overlying form.

Here, since the secondary tin plating layer 20' formed by the second tinning step (S7) is plated between the same material as the preceding primary tin plating layer 20, a longer time than the first tinning step (S5) During the formation of the secondary tin plating layer 20 ′, other tin plating quality is improved, and castability according to the centrifugal casting in the centrifugal casting step S8 described later is improved.

On the other hand, if the teaning time is set to less than 130 minutes in the second tinning step (S7), the plating thickness is less than the standard value, and if it exceeds 150 minutes, the tin plating layer 20 for each area of the cast surface 12 of the base metal material 10 Since the plating quality deteriorates due to thickness variation, the second tinning step (S7) is preferably performed at 310 to 315°C for 140 minutes.

8. Centrifugal casting step

In the centrifugal casting step (S8) according to the present invention, the base metal material 10 subjected to the second tinning step (S7) is put into a centrifugal casting machine as shown in FIG. 9 (a), and the base metal material 10 is subjected to the centrifugal casting method. ) It is a step of forming the babit metal layer 30 on the casting surface 12. 9(b) shows a state in which the babit metal layer 30 is formed on the casting surface 12 after the centrifugal casting is completed.

In the centrifugal casting step (S8), under the conditions of Babit metal material injection temperature 280 ~ 290 ℃, centrifugal casting machine rotation speed 285 ~ 295 rpm, cooling water injection timing 2 ~ 3 seconds, cooling water temperature 25 ~ 30 ℃ and cooling time 15 ~ 20 It is set in minutes. In addition, in the centrifugal casting step (S8), the pouring temperature is set to 410~420℃, the pouring amount 80~90kg, and the pouring time 55~60 seconds.

And, in the centrifugal casting step (S8), the cooling conditions are set based on the centrifugal casting conditions. Preferred centrifugal casting setting conditions are Babit metal material HOYT 11R, pouring temperature 420℃, pouring amount 90kg, material temperature 289℃, rotation Water 289rpm, pouring time 58 seconds, cooling water injection timing 3 seconds, cooling water temperature 25℃, cooling time 18 minutes, the bonding between the base metal material 10 and the babit metal layer 30 is 70 N/mm ² or higher. As it is reinforced with, it has the advantage of improving the performance of journal bearings and prolonging the life under high speed and high load conditions.

10 is a block diagram showing a cross-sectional structure of a journal bearing manufactured using a method for manufacturing a chrome copper journal bearing using centrifugal casting according to an embodiment of the present invention.

Journal bearings manufactured by the method of manufacturing a chrome copper journal bearing using centrifugal casting according to the present invention are formed of chrome copper and immersed in an alkaline cleaning tank to be degreased, and a base metal material with a circular cast surface 12 formed therein ( 10); First and second tin plating layers 20 and 20 ′ formed on the cast surface 12 of the base metal material 10; And a babit metal layer 30 that is centrifugally cast on the casting surface 12 on which the first and second tin plating layers 20 and 20 ′ are formed by introducing the base metal material 10 into a centrifugal control device. Done.

In addition, a detailed description of the configuration including the base metal material 10, the first and second tin plating layers 20 and 20 ′, and the babit metal layer 30 is a method of manufacturing a chrome copper journal bearing using the centrifugal casting. Since it overlaps with, a detailed description according to a specific embodiment will be omitted.

On the other hand, Figure 11 is a result of testing the bonding force by randomly selecting two journal bearing samples manufactured according to various embodiments of the method for manufacturing a chrome copper journal bearing using centrifugal casting of the present invention, SAMPLE 1 is 86.5 N/mm ² , and Sample 2 is 78.4 N/mm ² , and it can be seen that the bonding is improved to 70 N/mm ² or more, considering that the bonding force of journal bearings for general power generation facilities is 40-45 N/mm ² .

As described above, the most preferred embodiments of the present invention have been described in the detailed description of the present invention, but various modifications may be made within the scope of the technical scope of the present invention. Therefore, the scope of protection of the present invention is not limited to the above embodiments, but the scope of protection should be recognized from the techniques of the claims to be described later and equivalent technical means from these techniques.

10: base metal material 12: cast surface
20: primary tin plating layer 20': secondary tin plating layer
30: Babbitt metal layer

Claims (8)

Degreasing step (S1) of immersing the base metal material 10 made of chromium copper with the circular cast surface 12 processed therein in an alkaline cleaning tank;
After the degreasing step (S1), a masking step (S2) of applying a release agent 14 to the non-cast surface of the base metal material 10;
A pretreatment step of the cast surface of brushing an acidic washing solution or an aqueous chloride solution on the cast surface 12 of the base metal material 10;
After the pretreatment step of the casting surface, a first tinning step (S5) of immersing the base metal material 10 in a tin bath containing liquid tin to form a primary tin plating layer 20;
A water cooling step (S6) of injecting the base metal material 10 that has undergone the first tinning step (S5) into a cooling tank and cooling it;
After the water cooling step (S6), a second tinning step (S7) of immersing the base metal material 10 in a tin bath containing liquid tin to form a secondary tin plating layer (20'); And
Centrifugal casting step of injecting the base metal material 10 subjected to the second tinning step (S7) into a centrifugal casting machine, and forming a babit metal layer 30 on the casting surface 12 of the base metal material 10 by centrifugal casting method (S8); Chrome copper journal bearing manufacturing method using centrifugal casting, characterized in that consisting of.
The method of claim 1,
The pretreatment step of the casting surface includes a de-cleaning step (S3) of brushing an acidic cleaning solution on the casting surface 12 of the base metal material 10,
Chrome copper journal bearing manufacturing method using centrifugal casting, characterized in that consisting of a fluxing step (S4) of brushing an aqueous chloride solution on the casting surface 12 of the base metal material (10).
The method of claim 1,
The degreasing step (S1) is a method of manufacturing a chrome copper journal bearing using centrifugal casting, characterized in that after immersing the base metal material 10 in an alkaline washing tank at 70 to 80° C. for 30 to 40 minutes and then washing with water.
The method of claim 2,
The dehydration step (S3) is characterized by brushing the acidic washing solution preheated to 25 to 35°C on the casting surface 12 of the base metal material 10 for 3 to 5 minutes, and washing with water after 3 to 5 minutes. Chrome copper journal bearing manufacturing method using centrifugal casting.
The method of claim 2,
In the fluxing step (S4), brushing for 3 to 5 minutes while preheating a chlorinated aqueous solution containing 20 to 30% by weight of ZnCl to the casting surface 12 of the base metal material 10 at 40 to 50°C. Chrome copper journal bearing manufacturing method using centrifugal casting, characterized in that.
The method of claim 1,
The first tinning step (S5) is performed for 90 to 100 minutes in a tin bath at a temperature of 310 to 320°C, and then the second tinning step (S7) is performed in a tin bath at a temperature of 310 to 315°C. Tin bath), characterized in that 130 to 150 minutes in a method of manufacturing a chrome copper journal bearing using centrifugal casting.
The method of claim 1,
In the centrifugal casting step (S8), a cooling time of 15 to 20 minutes is set with a cooling water of 25 to 30° C. under conditions of a Babbitt metal material injection temperature of 280 to 290°C and a rotation speed of the centrifugal casting machine of 285 to 295 rpm, and the pouring temperature is Chrome copper journal bearing manufacturing method using centrifugal casting, characterized in that set to 410 ~ 420 ℃.
A journal bearing manufactured by the method of manufacturing a chrome copper journal bearing using the centrifugal casting of any one of claims 1 to 7.

Images