KR19980019316A - SLIDING BEARING AND MANUFACTURING METHOD THEREOF - Google Patents

Abstract

The present invention relates to a sliding bearing and a method for manufacturing the same, by which an iron-based small alloy layer is joined to a steel-back metal to improve load-carrying capacity, fatigue strength and indentation. In addition, it aims to be able to prevent departure and prevent back oil loss.

The sliding bearing of the present invention is a steel back metal; If the steel is bonded to the metal at the same time and sintered, copper 10-30 parts by weight, the rest is characterized in that it comprises an iron-based alloy layer consisting of iron. The bush-type sliding bearing manufacturing method according to the present invention comprises the steps of: inserting a copper-plated steel backing metal into a mold of a molding apparatus having a hollow and a lower pressing member installed at a lower end thereof so as to have a core installed therein; Filling the metal mixture powder having 10 to 30 parts by weight of copper, 6.5 parts by weight or less of graphite, and the balance of iron between the core and the metal, and inserting the upper pressing member at the top of the mold; Selectively pressing the upper pressing member or the lower pressing member at a pressure of 50-300 kg / cm ² to form the metal mixed powder; Sintering the molded body with a small-bonded layer and simultaneously bonding it to the steel-backed metal by holding the molded product produced in the forming step together with the steel-backed metal at a temperature of 1065-1095 ° C. under a predetermined gas atmosphere for 3-25 minutes. It is made to include.

Description

Sliding Bearing and Manufacturing Method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding bearing and a method for manufacturing the same, and in particular, an iron-based metal mixed powder molded body is joined to a steel-back metal at the same time as sintering to form a small alloy layer, thereby providing a load transfer capacity (surface pressure) The present invention relates to a sliding bearing capable of improving carrying capacity, fatigue strength and indentation, and a manufacturing method thereof.

In general, sliding bearings are used for driving parts or sliding parts of heavy equipment, presses, injection machines, vehicles, machine tools, industrial machines, etc. to support shafts, journals, or count plates. Bush, split, plate, etc. It is made in various forms, and is usually made of a copper alloy, aluminum-based alloy, copper-lead-based alloy, copper-based and synthetic resin-based composites and the like bonded to the metal.

For example, the configuration of the conventional sliding bearings is as follows.

First, there may be mentioned a sliding bearing in which an aluminum-based alloy layer is bonded to a metal if it is steel. This sliding bearing is composed of a steel backing metal, an intermediate adhesive layer bonded to the steel back side metal, and an aluminum bearing alloy layer bonded to the intermediate adhesive layer, as disclosed in Korean Patent Publication No. 96-3902. The aluminum bearing alloy layer contains a small amount of tin, silicon, the intermediate bonding layer is made of an aluminum alloy layer containing one or more small amounts of manganese, copper, magnesium optionally.

Second, a sliding bearing in which the copper-lead alloy layer is bonded is mentioned. This sliding bearing is an overlay of a steel backside metal, a copper-lead bearing alloy layer bonded to the steel backside metal, and a tin-containing lead alloy bonded to the bearing alloy layer, as disclosed in Korean Patent Publication No. 96-990. It consists of a multilayer structure having a.

Third, the sliding bearing which has a bearing layer which has a synthetic resin as a main component on the surface is mentioned. As described in Korean Patent Publication No. 92-8640, this sliding bearing has a porous metal layer formed on an inner metal such as steel sheet, and covers a surface of the porous metal layer so that a part thereof is impregnated in the pores of the porous metal layer. It consists of a bearing layer containing the main component, the impregnated portion and the bearing layer co-condenses the 4-fluorinated ethylene resin and the solid lubricant to agglomerate the fine powder particles of 4-fluorinated ethylene resin and the fine powder particles of the solid lubricant Is done.

However, in the conventional sliding bearings configured as described above, the alloy layer in contact with the sliding counter element is made of copper, copper-tin, copper-lead, aluminum, and synthetic resin having a relatively low strength so that the allowable load is 300-500 kg / It is inadequate for use for high loads of cm ² or more, and since the hardness cannot be increased by heat treatment, the wear resistance is inferior.

On the other hand, in view of these problems, as a sliding bearing, small-bonded alloy bearings made of only an iron-based small alloy layer without steel as a metal are also used. However, this sliding bearing is made of iron-based small alloy layer without metal if it is steel, but its load transfer capacity (surface pressure) is better than that of nonferrous alloy bearings, but its diameter and length are mainly 5-50 mm. It is used in a compact range and is not suitable for high loads.

On the other hand, in view of the above problems, a sliding bearing formed by joining an iron-based small alloy layer to a steel back metal has been proposed.

However, in this sliding bearing, 70 parts by weight or more of iron components are contained in consideration of conditions such as load-carrying capacity, fatigue strength and indentation, separation prevention and back oil loss prevention. It is necessary to have a layer of sintered gold with porosity in the 30 percent range, but it is very difficult to overlay on metal if it meets this condition. This is because, when sintering the iron-based mixed powder of such composition, the shrinkage is severe due to the densification phenomenon, and if the steel is expanded at the sintering temperature, the iron-based sintered body and the metal are manufactured in a separated state without being joined. .

Due to the difficulty of joining the backside metal and the small alloy layer, the iron-based metal mixed powder is first sintered to form a small alloy layer, and then a small alloy layer is formed on the metal if it is steel using a joining method such as welding or brazing. A method of manufacturing a sliding bearing in which an iron-based small bond layer is bonded to each other is used. In this case, the manufacturing process is increased in two stages, and the melted melting solvent that is melted during brazing is easily sucked into the pores of the small alloy layer by capillary force. Pore blocking occurs. Therefore, it is difficult to obtain porosity of 10% or more with respect to the volume of the sintered alloy layer during impregnation of the lubricant, and vulnerable tissues are formed by the reaction between the solubilizer and the sintered alloy. . In addition, since the flux used during brazing remains in the pores of the small alloy layer, corrosion occurs quickly and adversely affects lubrication characteristics.

The present invention has been made in view of the above-mentioned problems, and provides a sliding bearing made to improve load transfer capacity (surface pressure), fatigue strength and indentation, and to prevent departure and back oil loss. The purpose.

Another object of the present invention is to provide a sliding bearing that is capable of performing a self-lubrication smoothly and performing a combination of dry and wet lubrication.

Another object of the present invention is to provide a method of manufacturing a sliding bearing in which a small bond layer is formed by joining a metal when the iron-based mixed metal powder is sintered and steel simultaneously.

1 is a perspective view showing an example of a sliding bearing according to the present invention.

2 is a perspective view showing another example of a sliding bearing according to the present invention.

3 is a perspective view showing still another example of the sliding bearing according to the present invention.

Figure 4 is a cross-sectional view showing a sliding bearing made to have a long length by joining in the longitudinal direction using a plurality of bush-type sliding bearing of Figure 1 having the same diameter.

5 is a cross-sectional view schematically showing a molding apparatus for manufacturing the sliding bearing of FIG.

6 is a cross-sectional view showing a welding and joining state for manufacturing the sliding bearing of FIG.

FIG. 7 is a schematic cross-sectional view of a molding apparatus for manufacturing the sliding bearing of FIG. 2.

FIG. 8 is a cross-sectional view schematically illustrating a molding apparatus for manufacturing the sliding bearing of FIG. 3.

FIG. 9 is a schematic cross-sectional view of a rolling mill for manufacturing the sliding bearing of FIG. 3.

10 is a flowchart illustrating a process of manufacturing a sliding bearing according to the present invention.

11 is a graph showing the measurement results of Example 1 of the sliding bearing according to the present invention.

12 is a graph showing the measurement results of Example 2 of the sliding bearing according to the present invention.

Explanation of symbols for the main parts of the drawings

1, 2, 3: sliding bearings 4, 5, 6: forming apparatus

7: rolling mill 11, 21, 31: steel back side metal

12, 22, 32: small alloy layer 13, 23, 33: metal mixed powder molded body

15: coupling jaw 16: solvent

41, 51, 61: mold 42, 52: core

43, 53, 63: lower pressure member 44, 54, 64: upper pressure member

71: upper rolling roller 72: lower rolling roller

In order to achieve the above object, the sliding bearing according to the present invention is a steel back metal, and the steel back metal is bonded at the same time and sintered, the copper 30-30 parts by weight, the rest comprises an iron-based alloy layer made of iron. In addition, the iron-based alloying layer of the sliding bearing of the present invention further comprises 0.1 to 6.5 parts by weight of graphite. In addition, the iron-based bond layer of the sliding bearing of the present invention further comprises 0.1 to 7.0 parts by weight of molybdenum disulfide, 2 to 15 parts by weight of tin, 2 to 15 parts by weight of nickel, or 2 to 5 parts by weight of manganese.

On the other hand, the sliding bearing manufacturing method for manufacturing the sliding bearing according to the present invention in the bush type, if the core is installed in the center of the core and the lower pressure member is installed on the bottom of the molding apparatus provided with a copper plated steel, if the metal Inserting; Filling the metal mixture powder having 10 to 30 parts by weight of copper, 6.5 parts by weight or less of graphite, and the balance of iron between the core and the metal, and inserting the upper pressing member at the top of the mold; Selectively pressing the upper pressing member or the lower pressing member at a pressure of 50-300 kg / cm ² to form the metal mixed powder; Sintering the molded body with a small-bonded layer and simultaneously bonding it to the steel-backed metal by holding the molded product produced in the forming step together with the steel-backed metal at a temperature of 1065-1095 ° C. under a predetermined gas atmosphere for 3-25 minutes. It is characterized by including the.

According to the present invention, there is provided a plate-type sliding bearing manufacturing method comprising the steps of: inserting a steel back metal into a mold of a molding apparatus having a rectangular hollow with a lower pressing member inserted therein; If the steel is 10 to 30 parts by weight of copper, 6.5 parts by weight or less of graphite, and the rest of the iron-based metal mixed powder composed of iron and then inserting the upper pressure member in the upper end of the mold; Making a molded body by pressing the metal mixed powder by pressing the upper pressing member or the lower pressing member; Sintering the molded body with a small alloy layer and bonding it to the steel back metal by maintaining the molded body with a steel backing metal at a temperature of 1,065-1250 ° C. under a predetermined gas atmosphere for 3-25 minutes.

In addition, another plate-type sliding bearing manufacturing method of the present invention, if the steel is placed on a rolling machine, and the iron-based metal mixed powder in which 10 to 30 parts by weight of copper, 6.5 parts by weight or less of graphite, and the remainder is made of iron Laying step; Forming an iron-based metal mixed powder molded body on the steel, if the metal mixture powder is steel, passing the upper and lower rolling rollers at a predetermined pressure; And forming the iron-based small-alloy layer by bonding the molded body to the steel-side metal simultaneously with sintering by maintaining the steel-side metal and the molded body at a predetermined temperature under a predetermined gas atmosphere.

Other features and advantages of the present invention will become more apparent from the following description based on the accompanying drawings.

As illustrated in FIGS. 1 to 3, the sliding bearing according to the present invention may be formed in various shapes according to the purpose of use, such as a bush type, a split type divided into a semicircle, and a plate type.

As shown in Fig. 1 and Fig. 2, in the case of the bush-type sliding bearing 1 and the split sliding bearing 2, steel (11, 21) is located on the outer side of the steel, metal (11, 21). By sintering the iron-based metal mixed powder on the inner circumferential surface of the steel), the iron-based small-alloy layers 12 and 22 may be formed on the inner circumferential surfaces of the metal 11 and 21, and as shown in FIG. 3, a plate-type sliding bearing ( In the case of 3), the iron-based metal mixed powder is sintered to one surface of the metal backing metal 31 so that the iron-based small alloy layer 32 can be formed on any one surface of the steel backing metal 31.

According to the present invention, the constituents of the small-bonded metal layers 11, 21 and 31 are preferably made of 10 to 30 parts by weight of copper and the balance of iron. Graphite may be further added to 6.5 parts by weight or less of the small-bonded alloy layer.

In addition, according to the present invention, in addition to copper, graphite, and iron, the small-bonding layers 11, ₂₁ , and 31 may further include molybdenum disulfide (MoS ₂ ), tin, nickel, and manganese, in which case the ratio of copper is 10 to 10. 30 parts by weight of graphite, 6.5 parts by weight or less, 0.1 to 7.0 parts by weight of molybdenum disulfide, 2 to 15 parts by weight of tin, 2 to 15 parts by weight of nickel, 2 to 5 parts by weight of manganese, and the balance of iron desirable.

Since the sliding bearings 1, 2, and 3 are formed of the iron-based small-alloy layers 12, 22, and 32, heat treatment for increasing the hardness is possible.

When graphite or molybdenum disulfide is contained in the small bond layer 12, 22, 32, they act as a dry lubricant. In order to satisfy the long-term lubrication-free condition, it is preferable to impregnate the small alloy layer with a wet lubricant such as lubricating oil or grease.

In addition, if the steel used in the present invention, the metal is made of carbon steel, it is preferable that the copper plating treatment to a thickness of 2-10μm by electroless plating or electroplating. Here, stainless steel may be used as the metal if it is steel.

In addition, according to the present invention, as shown in Figure 4, by sliding and welding a plurality in the longitudinal direction can be a sliding bearing having a long length.

Next, the method of manufacturing the sliding bearing of this invention of the said structure is demonstrated.

First, the manufacturing method of a bush-type sliding bearing is demonstrated, referring FIG. 1, FIG. 4 thru | or 6, and FIG.

As the metal 11 used in this method, a copper plated one is used. The copper plating layer is preferably formed to have a thickness of 2 to 10 탆 through, for example, electroless plating or electroplating.

Next, the metal mixture powder having the composition ratio as described above is evenly mixed, and the core 42 is installed at the center and the mold 41 of the molding apparatus 4 is provided with the lower pressing member 43 at the lower end thereof. After the back metal 11 is inserted, the mixed metal mixed powder is filled between the metal back surface 11 and the core 42 to insert the upper pressing member 44 at the upper end of the mold 41.

Next, the metal mixed powder is press-molded to form the molded body 13 and then taken out together with the metal 11 if it is steel. At the time of press molding, the upper press member 44 or the lower press member 45 may be selectively pressurized or all pressurized. The molding pressure is preferably maintained at a pressure of 50 to 300 kg / cm 2, respectively, at an atmospheric pressure and a lower pressure, and the molding pressure is set in consideration of the desired porosity (volume ratio of the pores to the volume of the entire small alloy layer) after sintering bonding described below. . The porosity is preferably made from 10 to 30%.

Next, the iron-based small-alloy layer 12 is formed on the steel back metal 11 by sintering the molded body 13 together with the steel back metal 11. The sintering bonding process is carried out in any one gas atmosphere selected from the group comprising nitrogen, hydrogen, or a mixed gas atmosphere of nitrogen and hydrogen, ammonia decomposition gas atmosphere, argon gas atmosphere, vacuum pressure or endo and exothermal gas atmosphere. In the case of a mixed gas atmosphere of nitrogen and hydrogen, it is preferable that hydrogen is contained in a volume ratio of 30% or more with respect to the mixed gas. Further, in the case of vacuum pressure, 10 ^-2 Torr or less is preferable. The sintering temperature is preferably set to 1065 ° C to 1095 ° C, and the temperature is maintained for 3 to 25 minutes.

In the region outside the temperature and time range, the molded body 13 is sintered but is hardly bonded to the metal 11 if it is steel. Because, in the region within the temperature and time range, when the molded body 13 is sintered into the small alloy layer 12, the shrinkage hardly occurs or is slightly expanded to bond the small alloy layer 12 to the metal 11 if it is steel. This is easily achieved, but liquid phase sintering occurs in the region above the temperature and time ranges, and solid phase sintering occurs in the region below the temperature and time ranges. Poor bonding occurs. In addition, when the solid phase sintering occurs, the strength of the small alloy layer 12 becomes weak. When the liquid phase sintering occurs, if the molten copper having high fluidity formed by melting the copper during sintering is steel, the metal 11 and the small alloy layer 12 are formed. Not only is the distribution of pores in the small-alloy layer 12 uneven, but also adversely affects the porosity due to concentration at any one of the interfaces between and. In addition, the greater the flowability of the molten copper, the larger the shrinkage of the small-bonded alloy layer 12.

Therefore, when sintering is performed within each transition temperature and transition time range in which solid phase sintering and liquid phase sintering occur, copper contained in the molded body 13 is melted to form molten copper, but the viscosity of the molten copper at this time is relatively high. Therefore, if the fluidity is low and the steel is prevented from flowing to the interface between the metal 11 and the small-bonded gold layer or from being concentrated in one place, the distribution of molten copper is uniform. Therefore, a phenomenon in which pores of the small-alloy layer 12 are blocked is reduced, and the pores may be evenly distributed. On the other hand, the molten copper having a high viscosity is present on the surface of the small alloy layer 12 so that the metal 11 and the small alloy layer 12 are joined together at the same time as sintering.

In addition, the iron-based mixed metal powder out of the composition ratio is not sintered at the same time bonding. In this case, it is preferable to mainly change content of copper which plays a decisive role in joining.

When sintering is performed under the conditions as described above, porosity affecting physical properties such as load transfer capacity, fatigue strength, and indentation can be obtained in the range of about 10 to 40% with respect to the small alloy layer 12.

Next, the sliding bearing 1 obtained by sintering bonding as described above is subjected to heat treatment such as carburizing, nitriding, carburizing, quenching, or soaking to improve hardness. This heat treatment is possible because the small-bonded metal layer 12 is made of iron as a main component. In the case of heat treatment in a continuous furnace, it is preferable to transfer the sliding bearings 1 from the heating table to the cooling zone, and then maintain the temperature at 750 to 950 ° C. and then carry out carburizing, nitriding, carburizing, quenching, or souring treatment. .

When graphite or molybdenum disulfide is contained in the small alloy layer 12, they act as a dry lubricant, and lubricating oil or grease is applied to the sliding bearing (1) heat-treated to use the sliding bearing (1) without lubrication for a long time. Impregnating a wet lubricant such as may be further included.

In addition, according to the present invention, as shown in Figure 4 by sliding the bush-type sliding bearings (1), (1) having the same diameter in the longitudinal direction can be produced a sliding bearing having a long length in the longitudinal direction, Figure With reference to 4 and 6 will be described a manufacturing method of such a sliding bearing.

As a method of manufacturing a sliding bearing having a long length in the longitudinal direction, one sliding bearing is to have a female coupling jaw (15) on the inner peripheral surface of the metal 11 if the steel bearing, the other one on the outer peripheral surface of one end of the metal (11) if the steel By having the male coupling jaw 15, and then combining them with each other by welding or brazing it can be produced a sliding bearing of a long length. Preferably, as a TIG welding or brazing method, a method of manufacturing a sliding bearing having a long length by brazing a torch by furnace brazing at the same time as sintering bonding in a sintering bonding process using silver or copper solder can be employed. In addition, as shown in Figure 6 by inserting the copper-based solvent (16) in advance between the coupling step (15, 15) furnace brazing by performing the sintering bonding and brazing in a single process, the multilayer of the present invention The length of the bearing bush can be increased. It is also possible to join by TIG welding. The small-alloy layer 12 is provided with an inner circumferential surface groove 14 to function as a grease feeding and storage groove.

Next, a method of manufacturing the split sliding bearing 2 divided into semi-cylindrical shapes will be described with reference to FIGS. 2 and 7.

In this method, if the metal 21 is placed on the mold 51 of the molding apparatus 5 having a semi-cylindrical hollow and a semi-cylindrical core 52 at the center and a lower pressing member 53 at the lower end thereof, After inserting, the iron-based metal mixed powder is filled between the steel backing metal 21 and the mold 51, and then the upper press member 54 is inserted into the upper end of the mold 51 to press-form the molded body 23. To produce a sliding bearing 2 in which the small alloy layer 22 is formed on the steel back metal 21 by sintering the molded body 23 together with the steel back metal 21 under the same conditions as described above. Since all of the bush-type sliding bearings have the same method as the manufacturing method, detailed description thereof will be omitted here. Also, by dividing the bush-type sliding bearing 1 in half, two divided sliding bearings 2, 2 can be obtained.

Next, a method of manufacturing the plate-type sliding bearing 3 will be described with reference to FIGS. 3, 8 and 9.

In this method, a metal bearing powder having a composition ratio as described above is sintered and simultaneously bonded to a copper plated plate-type steel backing metal 31 at a predetermined thickness to form an iron-based small alloy layer 32. As a method, as shown in Fig. 8, first, the steel back metal 31 is placed on the mold 61 of the molding apparatus 6 having a rectangular hollow in which the lower pressing member 63 is inserted.

Next, if the steel is a metal mixture powder of the composition described above on the metal 31, the upper pressing member 64 is inserted into the upper end of the mold 61 to the upper pressing member 64 and the lower pressing member 63. By pressing at the predetermined pressure described above, the metal mixed powder is press-molded to form a molded body 33.

Next, the molded body 33 is held together with the steel back metal 11 at a predetermined temperature under a predetermined gas atmosphere for a predetermined time to bond the molded body 33 to the steel back metal 31 at the same time as the sintered metal layer. Form.

According to the method of using the rolling mill 7 as shown in FIG. 9 as a method different from the above method, first, if the steel 31 is placed on the rolling mill 1, a metal mixed powder having the above composition ratio is placed thereon. Release.

Next, if the metal mixture powder is steel placed on the upper side, the metal 31 is passed through the upper and lower rolling rollers 71 and 72 at a predetermined pressure, and the powder is kept at a predetermined temperature under a predetermined gas atmosphere for a predetermined time. At the same time as sintering the molded body is joined to the steel back metal 31 to form an iron-based small alloy layer 33, and if necessary, the lubricant impregnation process and heat treatment process as described above in the bush-type sliding bearing manufacturing method.

In the manufacturing method of the plate type sliding bearing 3, unlike the bush type or the split type sliding bearing manufacturing method, it is preferable to keep the sintering temperature in the range of 1,065 ° C to 1250 ° C and to maintain the holding time for 3 minutes to 35 minutes. . Under such sintering conditions, the unbonded and bonded defects do not occur due to the difference in relative shrinkage and thermal expansion of the small alloy layer 32 and the steel back metal 31. In addition, when the composition range of the metal mixed powder does not deviate from the above range, unbonding and poor bonding do not occur. When the sintering joining process is performed in the range outside the above conditions, in the plate-type sliding bearing 3, unlike the bush-type sliding bearing 1, the center part of the interface is joined and the edge region is twisted. This defect which does not join at all occurs. For this reason, the former defect is different from the bush type, if the small alloy layer 32 is located above the metal 31 if the steel is not only affected by its own weight, but also appears as a complex effect due to distortion during cooling. The latter case is a defect occurring in relation to the composition ratio of the metal mixed powder as described above.

Example 1

Metal mixed powder is composed of 74 parts by weight of iron, 25 parts by weight of copper, and 1 part by weight of graphite, and the molding pressure is 50-300kg / cm 2, respectively. Is 102mm and 6mm thick steel, and the sintering temperature together with the metal was maintained in the range of 5 to 60 minutes in the range of 930 ° C to 1100 ° C, and then cooled bearings were manufactured. The shrinkage rate of the layer and the result of measuring the bondability between the small-bonded metal layer and the steel metal are shown in the graph of FIG.

As can be seen from the graph of FIG. 11, it can be seen that there is almost no shrinkage when held at a sintering temperature in the range of 1065 ° C to 1095 ° C for 3 minutes to 25 minutes, and the sintering and bonding are performed well.

Example 2

The metal mixed powder in which 75 parts by weight of iron powder and 25 parts by weight of copper powder were mixed, and the metal mixed powder in which 74 parts by weight of iron powder, 25 parts by weight of copper powder and 1 part by weight of graphite powder were mixed by a molding apparatus and a roll compression method were used. Copper-plated steel backing made of a 150-mm, 50-mm, 20-mm-thick molded body with 5 to 60 minutes at a temperature in the range of 900 to 1200 degrees in a mixed nitrogen and hydrogen gas atmosphere. After maintaining and cooling, a plate-type sliding bearing was manufactured, and the shrinkage ratio of the small-bonded gold layer of the sliding bearing and the bondability of the small-bonded gold layer and the metal, if the steel were measured, are shown in the graph of FIG. 12. Molding pressure was applied to 50-300kg / ㎠ for both up and down pressure.

As can be seen from the graph of Figure 12, it can be seen that the sintering temperature to obtain the most sintered state without the unbonded and poor bond due to the relative shrinkage and expansion rate of the small bond layer is in the range of 1,065 to 1250 degrees, It can be seen that the sintering holding temperature ranges from 3 minutes to 20 minutes.

The effect of the sliding bearing according to the present invention made as described above and the manufacturing method thereof are as follows.

1) If the iron-based mixed metal powder is steel, it is sintered in the transition region of solid state sintering and liquid phase sintering in a state of being contact-molded with the metal, so that it can be sintered to the iron-based small alloy layer and easily joined to the metal if the steel is sintered.

2) The back side metal is made of carbon steel with hardness control and the low density iron-based alloy with lubrication and friction properties is bonded to the inner side, so the back side metal supports the load of the inner bearing material, so the allowable load is over 700kg / cm ² .

3) If the counterpart is hard chromium carbon steel, the coefficient of dynamic friction is 0.05 and the operating temperature is 30-100 ℃ or less.

4) When the housing is iron-based, the press-fitting is easy, the housing and the elastic modulus are similar, and the sliding bearing according to the present invention does not cause the separation problem from the housing due to the low coefficient of friction.

5) There is no friction noise and noise when reciprocating, swinging and rotating with the shaft.

6) The embeddability of foreign matter and wear residue is very good.

7) Resistant to impact loads, and if steel, the metal retains the iron-based alloying layer in a bonded form, so the effect of preventing cracks and fatigue is extremely excellent.

8) No seizure or sintering of the inner bearing sintering material to the counterpart will occur under any circumstances during operation.

9) Excellent compatibility with the counterpart, especially when the counterpart is hard chromium-plated carbon steel, it does not damage the counterpart at all.

10) If it is steel, there is no metal, so there is no oil loss on the bearing back side. In addition, even after the bearing is operated, there is a steel back metal on the back of the bearing, so that the low pressure acts on the pores in the back metal part much more than the bearing without the back metal and general bearings, so that the recovery rate of lubricating oil is high.

11) Due to the compound magnetic lubrication effect, the unpaid period is greatly increased. The grease feeding period can be improved from a minimum of 300 hours to more than 1000 hours, and the unpaid period can be semi-permanent depending on the bearing design method.

12) Since the bearing back is carbon steel, welding is possible, and the thickness of the bearing back metal can be adjusted, so that it can be housed or can be used by welding other supports.

Claims (9)

Steel and metal; If the steel is sintered simultaneously with the metal, the copper bearing 10-30 parts by weight, the rest of the sliding bearing comprising an iron-based alloy layer consisting of iron. The method of claim 1, The iron-based bond layer is a sliding bearing, characterized in that it further comprises 0.1 to 6.5 parts by weight of graphite. The sliding bearing according to claim 1 or 2, wherein the iron-based small alloy bond layer further comprises 0.1-7.0 parts by weight of molybdenum disulfide. The method according to claim 1 or 2, The iron-based alloy bond layer is a sliding bearing, characterized in that it further comprises 2 to 15 parts by weight of tin, 2 to 15 parts by weight of nickel, or 2 to 5 parts by weight of manganese. The sliding bearing according to claim 1, wherein the steel back metal is copper plated by an electroless plating method or an electroplating method with a thickness of 2 to 10 µm. In the sliding bearing manufacturing method for manufacturing a sliding bearing in the form of a bush: Inserting a copper-plated steel backing metal into a mold of a molding apparatus having a hollow so that a core is installed at the center and a lower pressing member installed at a lower end thereof; Filling the metal mixture powder having 10 to 30 parts by weight of copper, 6.5 parts by weight or less of graphite, and the balance of iron between the core and the metal, and inserting the upper pressing member at the top of the mold; Selectively pressing the upper pressing member or the lower pressing member at a pressure of 50-300 kg / cm ² to form the metal mixed powder; Sintering the molded body with a small-bonded layer and simultaneously bonding it to the steel-backed metal by holding the molded product produced in the forming step together with the steel-backed metal at a temperature of 1065-1095 ° C. under a predetermined gas atmosphere for 3-25 minutes. Sliding bearing manufacturing method characterized in that it comprises. The method of claim 6, The gas atmosphere is sliding, characterized in that the gas atmosphere selected from the group consisting of nitrogen, hydrogen, mixed gas atmosphere of nitrogen and hydrogen, ammonia decomposition gas atmosphere, argon gas atmosphere, vacuum pressure or endo and exothermal gas atmosphere Bearing manufacturing method. In the sliding bearing manufacturing method for manufacturing a sliding bearing in the form of a plate: Inserting a steel back metal into a mold of a molding apparatus having a rectangular hollow having a lower pressing member inserted therein; If the steel is 10-30 parts by weight of copper, 6.5 parts by weight or less of graphite, 7.0 parts by weight or less of molybdenum disulfide and the remainder of the iron-based metal mixed powder composed of iron and then inserting the upper pressing member in the upper end of the mold and ; Making a molded body by pressing the metal mixed powder by pressing the upper pressing member or the lower pressing member; Sintering the molded body with a small-bonded layer of gold and bonding it to the steel-side metal at the same time by maintaining the molded body with a steel backing metal at a temperature of 1,065-1250 ° C. under a predetermined gas atmosphere for 3-25 minutes. Sliding bearing manufacturing apparatus. In the sliding bearing manufacturing method for manufacturing a sliding bearing in a plate shape, Placing an iron-based metal mixture powder on a rolling machine, and placing iron-based metal mixed powder having 10 to 30 parts by weight of copper, 6.5 parts by weight or less of graphite, 7.0 parts by weight or less of molybdenum disulfide, and a balance of iron; Forming an iron-based metal mixed powder molded body on the steel, if the metal mixture powder is steel, passing the upper and lower rolling rollers at a predetermined pressure; And holding the metal and the molded body at a predetermined temperature for a predetermined time, thereby bonding the molded body to a steel backed metal at the same time as sintering to form an iron-based small alloy layer.