KR20180083486A - Oilless bearing comprising coating material having mesh supporting layer - Google Patents

Abstract

The present invention relates to an oilless bearing including a multilayer coating material having a mesh supporting layer and a composite material layer. The oilless bearing includes: a base steel plate composed of a pickled cold rolled steel sheet; a sintered mesh supporting layer coupled on the base steel plate; and a calcined composite material layer formed by being supplied between the base steel plate and the mesh supporting layer. The composite material layer includes a PTFE 1 agent, a PTFE 2 agent, and an additive. According to the present invention, the composite material layer, the mesh supporting layer, and so on are bonded onto the base steel plate through hot rolling, sintering, and firing processes. As a result, thin film-type addition is performed, low friction and high durability are enhanced, and thus the bearing having the multilayer coating material can be provided.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an oil-free bearing including a multi-layer coating material having a mesh support layer,

The present invention relates to an oil-less bearing comprising a multi-layer coating having a composite layer and a mesh support layer. More specifically, the composite material layer and the mesh support layer are bonded to each other through a hot rolling process, a sintering process, and a firing process on a base steel plate to form a thin film, thereby enhancing low friction and high durability, .

In general, the bearing is a part that performs a function of supporting a shaft that performs a rotational motion or a linear motion, and its type and shape are largely divided into a sliding bearing, a rolling bearing, and a bushing bearing according to the purpose and function.

Conventionally, bearings used in the prior art are provided with lubricant such as oil or grease periodically or continuously in order to prevent frictional resistance, abrasion and heat generation due to the characteristics of the bar made of a metal material, thereby rotating and sliding the shaft.

However, in the case of conventional metal bearings, the use of the bearing surface may be restricted due to a special environment exposed to a cleaning agent, cooling water, hydrofluoric acid, hydrochloric acid and chlorine gas. In order to solve this problem, DU or DC coating is applied, corrosion still occurs in the acid, base and corrosive gas atmosphere, and the bearing operation is not smooth.

On the other hand, the development of a customized product suitable for the target market, such as application of super high load or precision machine, etc., has been urgently needed in order to overcome the salt and gas atmosphere environment as well as to replace the conventional use of rolling bearings by using a dry lubricating bearing having a composite material Is required. In addition, the development of high-end composite dry lubricated bearings has increased the need to meet the high performance and high quality requirements of consumers.

In the case of dry lubricating bearings for copper sintering, the bronze powder should be uniformly arranged with fine particles, but due to misalignment and deviation caused by abrasion, the service life of the product is decreased and the sliding layer is separated An improved system, method and apparatus for bearings and tolerance rings for assemblies that have difficulty in applying ultra high load and super high load products and have tolerance compensation for wear and misalignment and which do not require maintenance Development of the implemented bearings is necessary.

As a conventional document for suggesting a composite sliding bearing, reference may be made to Laid-Open Patent No. 10-2013-0098383 (2013.09.04).

In this document, it is confirmed that the compound sliding bearing in which a resin layer made of an aromatic polyether ketone resin is formed using a sintered metal as a base, which is used for a sliding bearing having a high rotation accuracy by stabilizing lubricity, is disclosed.

(Patent Document 1) KR10-2013-0098383 A

The present invention aims to overcome the above-mentioned problems of the prior art. The present invention relates to a method of bonding a composite material layer and a mesh support layer on a base steel plate through hot rolling, sintering and sintering processes to form a thin film, thereby achieving low friction and high durability It is an object to provide a bearing which is reinforced to have a multi-layer coating.

According to an aspect of the present invention, there is provided an oil-free bearing including a multi-layer coating material having a composite material layer and a mesh support layer, comprising: a base steel plate made of pickled cold-rolled steel; A mesh support layer bonded to the base steel sheet and sintered; And a composite material layer formed between the base steel plate and the mesh support layer and fired, the composite material layer including a PTFE 1 agent, a PTFE 2 agent, and an additive.

The PTFE 1, PTFE 2, and Additive are mixed at a ratio of 3: 6: 1.

The Additive mixes MoS2, Si and Graphite in a ratio of 3: 3: 4.

According to another aspect of the present invention, there is provided a method of manufacturing an oil-less bearing, the method comprising: preparing a bottom steel plate made of a cold-rolled steel sheet; Picking the base steel plate 10; Stacking a metal mesh on the metal powder; Sintering the laminated structure of the metal powder and the metal mesh to form a mesh support layer; Impregnating the PTFE compound comprising PTFE 1, PTFE 2 and Additive between the bottom steel plate and the mesh support layer; Forming a composite material layer through a firing process after impregnating the PTFE compound; And performing hot rolling on the base steel plate, the composite material layer, and the mesh support layer.

The non-lube bearing including the multi-layer coating material having the composite material layer and the mesh support layer as described above according to the present invention is characterized in that a composite material layer such as a PTFE compound and a mesh support layer sintered on the base steel plate are hot rolled, sintered and sintered Through the process of bonding to form a thin film, thereby enhancing low friction and high durability to form a bearing having a multilayer coating.

Particularly, the multi-layer coating material constituting the bearing functions as a composite layer including a plurality of PTFE materials, an additive and a metal mesh. MoS2, Si, graphite and the like are added as an additive on the composite material layer to improve sliding performance Or through a mesh support layer to apply to ultra high load and ultra high-speed products to smooth the joining of different materials and to provide tolerance compensation for wear and misalignment, thereby providing a bearing system that does not require maintenance.

FIG. 1 is a view showing a process of forming an oil-less bearing including a multi-layer coating material having a composite material layer and a mesh support layer according to an embodiment of the present invention;
FIG. 2 is a view showing a manufacturing process of the non-lubricated bearing of FIG. 1,
3 is a view showing a multi-layer coating material forming an oil-free bearing according to the present invention, and Fig.
4 is a flowchart illustrating a process of manufacturing the non-lubricant bearing according to the present invention in a time-wise manner.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of other various forms of implementation, and that these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know completely. Wherein like reference numerals refer to like elements throughout.

It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

FIG. 1 is a view showing a process of forming an oil-less bearing including a multi-layer coating material having a composite material layer and a mesh support layer according to an embodiment of the present invention. FIG. 2 is a view showing a manufacturing process of the non- FIG. 4 is a flow chart showing a process of manufacturing the non-lubricant bearing according to the present invention in a time-series manner.

In the present invention, a sliding coating layer using a composite material layer and a mesh supporting layer is developed and applied on a journal contact portion. The metal mesh coating layer impregnated with the PTFE Compound, which is the key of the sliding function in a dry lubricating bearing, It plays an important role in providing continuous sliding function.

In the present invention, PTFE compound material capable of fusing with a base steel plate material and a metal mesh support are bonded through a hot rolling process, a sintering process, and a sintering process to form a thin film, thereby enhancing low friction and high durability, .

The present invention includes impregnation between a base steel plate and a mesh support layer by incorporating PTFE-based 1, 2, and additive (MoS2, Si, Graphite) as a composite material layer forming a coating layer.

1 to 4, a non-lube bearing material for realizing a multilayer coating material is sequentially shown by joining a sintered mesh supporting layer and a composite material layer to be sintered on a base steel plate to be provided.

FIG. 1 (a) shows a base steel plate 10 provided basically for the production of an oil-less bearing. As the base steel plate 10, a cold-rolled steel plate is employed. The cold-rolled steel sheet uses steel plate cold commercial (SPCC) or cold rolled carbon steel sheet (CR).

A cold-rolled steel sheet is a steel sheet which is washed with an acid and then rolled with a cold strip mill or a reverse mill at room temperature to have a uniform thickness and a smooth and glossy surface. This can be adjusted by hardening with a roughing mill and smoothening the surface so that it can withstand machining by drawing or deep drawing.

The cold-rolled steel sheet is produced by a pickling process for removing the surface scale from hot-rolled coil and rolling through a thickness of 0.15 to 3.2 mm, followed by annealing and temper rolling. The cold-rolled steel sheet is produced by a pickling process in which a hot-rolled steel strip is passed through a scale breaker and a hydrochloric acid tank to remove an oxide film which is a cause of surface defects in a final cold rolled product; Cold rolling, which uses advanced control devices such as automatic thickness control and automatic shape control with uniform thickness and shape control, with a normal reduction rate of 40% to 90% in order to obtain the thickness and material suitable for the application. Electrolytic cleaning to remove cold rolling oil and dirt through mechanical and chemical reaction by passing cold-rolled steel sheet through alkali solution before annealing; This is a process for softening the material of hardened steel during cold rolling. An annealing method using box annealing and a continuous annealing method as an excellent production method for producing from deep drawing to high tensile steel through rapid heating and rapid cooling; Temper rolling in which defects such as stress strains, which are likely to appear in annealed steel strips, are removed through rolling with a reduction of about 1% on the plate, and an appropriate roughness is given to produce a product with a beautiful surface; And the final process of production, it is produced by correcting the defects of the product and judging whether it is suitable for use, in accordance with the size desired by the customer.

In order to manufacture the non-lube bearing through the base steel plate 10 according to the present invention, a pretreatment process is performed first. The pretreatment step may be a pickling treatment using 12% HCl.

Fig. 1 (b) shows a mesh support layer 20 that is bonded onto a bottom steel plate 10.

The mesh support layer 20 means a metal mesh layer and is preliminarily bonded to the bottom metal plate 10. [ The mesh support layer 20 is formed by laminating a metal mesh (99.9% Copper Mesh) on a Cu powder sintered layer for a Cu sintered layer.

The sintering treatment is carried out at a high temperature of 800 DEG C or more in a state where the mesh supporting layer 20 is preliminarily laminated on the bottom steel plate 10 (Fig. 2 (a)).

1 (c) shows a process of supplying a PTFE Compound constituting a composite material layer between the bottom steel plate 10 and the mesh support layer 20.

The composite material layer performs an intermediate function between the bottom steel plate 10 and the mesh support layer 20. [

The composite material layer is formed by supplying a PTFE compound onto the preliminary bonding structure between the bottom steel plate 10 and the mesh support layer 20 and firing the mixture at a temperature of 300 캜 or higher (Fig. 2 (b)).

The PTFE compound is mixed with PTFE 1, PTFE 2, and Additive at a ratio of 3: 6: 1. As described above, the feed amount can be set in the order of PTFE 1 additive and additive on the basis of the most supplied PTFE 2 agent.

Additives, on the other hand, are prepared by mixing MoS2, Si and Graphite at a ratio of 3: 3: 4. As described above, it is possible to set the supply amount of MoS2 and Si at the same ratio based on the graphite supplied the most.

On the other hand, as the additive (additive), any one or more of MoS ₂ (molybdenum disulfide), Graphite (graphite), Glass fiber and WS ₂ (tungsten disulfide) can be adopted.

MoS ₂ has strong friction and heat resistance and is considered to be the most suitable additive for the characterization of the present invention. The MoS ₂ is improved in durability and frictional resistance through chemical synthesis with plastics, and can be used for manufacturing abrasion resistant resins, bearings and wear pads.

Graphite is a high temperature lubricant with many applications in the industry, and it can increase the efficiency of frictional reduction when the slide layer is arranged in parallel with the plate filler. The Gaphite is a carbonaceous material having a low density molecular structure and is a mineral which has flexibility but hardly elasticity, but has a metallic characteristic such as heat and electric conductivity. The Gaphite is used as a pencil, electric motor, battery, brush for fuel, high temperature lubricant.

Glass fiber can be used to increase the strength of the slide layer. The glass fiber has high mechanical strength at high temperature and can be used for each characteristic customized glass and is used for a dome structure such as a composite material, a reinforced plastic, a soundproofing material, a heat insulating material, an aircraft, a rocket motor case and a tent.

WS ₂ can improve the sliding performance by pore fill of metallic material. The WS ₂ can fill the metal pore through diffusion or form a layer on the metal surface. Also, it is used as ball bearing structure, plain bearing plate, friction surface coating as nano powder of 30-150 nm size.

The additives such as MoS ₂ act as a friction reducing filler and can improve the strength of the slide layer, the heat resistance, and the wear resistance through the above-described conventional Teflon mixture and a sufficient binding and firing (heating) process.

Fig. 1 (d) shows the final coated non-lube bearing material in a composite arrangement between the bottom steel plate 10 and the mesh support layer 20. The above process is performed by hot rolling to bond the conveyed material (Fig. 2 (c)).

Figure 3 shows a multi-layer coating that forms an oil-free bearing in accordance with the present invention.

On the other hand, the thickness of the metal mesh structure including the bottom steel plate 10, the mesh support layer 20 and the PTFE Compound may be 0.2 mm to 0.3 mm.

The non-lube bearing including the multi-layer coating material having the composite material layer and the mesh support layer as described above according to the present invention is characterized in that a composite material layer such as a PTFE compound and a mesh support layer sintered on the base steel plate are hot rolled, sintered and sintered Through the process of bonding to form a thin film, thereby enhancing low friction and high durability to form a bearing having a multilayer coating.

It is to be understood that the terms "comprises", "comprising", or "having" as used in the foregoing description mean that the constituent element can be implanted unless specifically stated to the contrary, But should be construed as further including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (4)

A base steel plate made of cold-rolled steel sheet pickled;
A mesh support layer bonded to the base steel sheet and sintered; And
And a composite material layer formed between the bottom steel plate and the mesh support layer and fired,
Wherein the composite material layer comprises a PTFE 1 agent, a PTFE 2 agent and an additive.
An oil-less bearing comprising a multi-layer coating having a composite layer and a mesh support layer.
The method according to claim 1,
The PTFE 1, PTFE 2, and Additive were mixed at a ratio of 3: 6: 1.
An oil-less bearing comprising a multi-layer coating having a composite layer and a mesh support layer.
3. The method of claim 2,
The additive is a mixture of MoS2, Si and Graphite in a ratio of 3: 3: 4,
An oil-less bearing comprising a multi-layer coating having a composite layer and a mesh support layer.
4. A method of manufacturing an oil-less bearing according to any one of claims 1 to 3,
Preparing a base steel plate 10 made of a cold-rolled steel sheet;
Picking the base steel plate 10;
Stacking a metal mesh on the metal powder;
Sintering the laminated structure of the metal powder and the metal mesh to form a mesh support layer;
Impregnating the PTFE compound comprising PTFE 1, PTFE 2 and Additive between the bottom steel plate and the mesh support layer;
Forming a composite material layer through a firing process after impregnating the PTFE compound; And
And performing hot rolling on the base steel plate, the composite material layer, and the mesh support layer.
A method for manufacturing an oil-less bearing comprising a multi-layer coating material having a composite layer and a mesh support layer.

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