JPH04505335A - Maintenance-free sliding bearing and its manufacturing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Maintenance-free sliding bearing The object of the invention is a new maintenance-free multilayer sliding bearing.

Maintenance-free sliding bearings consisting of a metal bearing and a plastic layer can be used, for example, in Known from Patent Publication No. 353424225 and European Patent Application No. 0217462 It is. Such multilayer sliding bearings are made from a rough base layer of steel, bronze or high-strength Metal support made of aluminum alloy and matrix of polytetrafluoroethylene It is a combination with a sliding layer made of

The rough base layer consists of a sintered porous bronze layer, iron layer or aluminum alloy layer . This layer can be a polytetrafluoroethylene layer applied on top in the form of a paste, or It becomes the material that fixes the layer made of the copolymer. High viscosity paste is rolled Press firmly and sinter.

The sliding bearings mentioned above have a plastic layer formed from a paste for many applications. The downside is that it is too thin. Therefore, the bearings manufactured from now on will not have a sufficient lifespan. . Furthermore, the irregularities that appear when the multilayer material is deformed cannot be pulled back.

Adding bronze particles to the paste to improve the heat transfer properties of the plastic, which is important for the bearings. If mixed, the outer layer may be oxidized during the manufacturing process. Also, such support material The material is not inert. In particular, it may be attacked by acids. More paste Particles may separate from the paste during application.

Fertigungstechnik und Betrieb 23 (197 3), No, 1. According to p. 48-49, ordinary polytetrafluoroethylene It is known that sheets can be laminated using a method of laminating sheets. This material can be used for all adhesives It is completely inert to the agent and thus allows the sheets to be adhered in the first place. That is, Polytetrafluoroethylene sheets cannot be attached onto a support, so , fixed only by physical adhesive force. On the contrary, the sheets can be glued together. It is necessary to fix it. Therefore, in this case, the temperature load potential is Regardless of the nature of the material, it depends on the adhesive used.

DB-O32401804 has a sliding layer that is substantially free of filler. The present invention relates to a composite support member made of plastic. This includes polyarylene sulfuric acid. resin, epoxide resin, polyamide resin, polyester resin, phenoxy resin, polymer liimide resin, polyamide-imide resin, polypropylene resin and polysulfonate resin. Use resin. These plastic sheets also cannot be directly attached to metal surfaces. It can be fixed to metal surfaces with the help of suitable adhesives. Others, plastic It is recommended to apply a thin film of lubricant to the stick.

PR-PS 1354161 is a tetrafluoroethylene filled with molybdenum disulfide. A stack consisting of tyrene is disclosed. Adhesives Age February 1967 , p. 30-34 also refer to metal laminated with polytetrafluoroethylene. Ru. However, polytetrafluoroethylene can be chemically treated to create epoxide groups. and bonded to a metal support. Direct attachment is only possible for FEP. this The material is thermoplastic and, as opposed to tetrafluoroethylene, has an additional bonding layer. Emphasize that it can be attached directly to metal without the need for

Finally, according to Da-O33021369, modified tetrafluoroethylene Flowable granular powders made of polymers are known. This powder has a bulk weight of Based on its flowability and flowability, it is especially suitable for automatic metering and therefore for charging into ram extrusions. . There is no statement that this material is suitable for application to metal or other materials.

The problem to be solved by the invention is to provide a maintenance-free sliding bearing that does not have the above drawbacks. It is to provide.

This task consists of a metal support and the formula attached directly onto it: CF2=CF-0-Rf( In the formula, Rf is perfluoroethyl, perfluoro-n-propyl or perfluoro perfluoroalkyl vinyl ether represented by (representing an oro-n-butyl group) A sliding layer consisting of a copolymer with tetrafluoroethylene or A sliding support consisting of an intermediate layer with a sliding layer made of plastic. Therefore, it is solved.

Copolymer of perfluoroalkyl vinyl ether and tetrafluoroethylene The layer consisting of has a thickness suitable for later processing. This thickness is 1.5fflII+ It can be made thicker.

This layer is applied directly to the smooth or rough surface of the metal support.

This is done by pressing the copolymer layer flat against the metal support until sufficient adhesion is achieved. conduct. The feature of the present invention is that perfluoroalkyl vinyl ether and tetrafluorocarbon A layer consisting of a copolymer with ethylene can be applied directly to a metal support.

This layer may act directly as a sliding layer or may be coated with trifluoroethylene, polyimide or polyetheretherketone (PEE) K) acts as an interlayer with good adhesion. i.e. perfluoroalkyl bi Copolymers of nyl ether and tetrafluoroethylene can be made adhesive or It is not necessary to fasten by glue or glue. This makes it especially possible to performance is independent of the adhesive used.

Particularly consider steel as the metal support. Perfluoroalkyl vinyl ether and te A slippery layer material attached to the copolymer layer with trafluoroethylene. plastics, especially polytetrafluoroethylene, polyimide or polymers. Lietheretherketone (PEEK) is suitable.

Copolymer of perfluoroalkyl vinyl ether and tetrafluoroethylene layer and/or a sliding layer of plastic attached to this layer. , to thicken and/or to improve heat transfer and/or wear resistance. One or more fillers can be added for this purpose.

Depending on the purpose, carbon, alumina, ceramic materials, glass, bronze, disulfuric acid, etc. Can contain molybdenum chloride or silicon carbide mesh, powder, spheres or fibers .

Silicon carbide particles provide good heat transfer, which eliminates the risk of oxidation during the manufacturing process. does not cause Note that silicon carbide particles are acid resistant and inexpensive. Ma It is lighter than metal particles, especially bronze, so perfluoroalkyl vinyl ether from the mixture when forming a copolymer layer of tel and tetrafluoroethylene. There is no risk of separation. Such filling is necessary to improve the wear resistance of sliding bearings. The filler must remain on the bearing side. According to the invention, the filler , perfluoroalkyl vinyl ether without having to be pressed with a roll as in conventional technology. Since the filler content is mixed into the copolymer layer of tetrafluoroethylene and tetrafluoroethylene, can realize 1 to 40% by volume. Particularly preferred is 5 to 30% by volume.

A copolymer consisting of perfluoroalkyl vinyl ether and tetrafluoroethylene The reamer layer can be very reliably thickened up to 1.5 mm. In addition, the current According to technology, it is impossible to press the paste with a roll to make it thicker than 50 μm. Can not.

In experiments, this sliding bearing can withstand temperatures up to 260°C, depending on the material used. At working temperatures, perfluoroalkyl vinyl ether and tetrafluoroethyl The copolymer layer with Ren will not peel off. Also, for a short period of time, it is higher than this. Withstands temperature loads without damage.

The structure of the sliding bearing material of the invention is shown in the figure. In the figure, the metal layer is 1 and the metal layer is 1. There are two copolymer layers of fluoroalkyl vinyl ether and tetrafluoroethylene. The plastic layer attached on top of this is shown as 3.

The following examples will explain the invention in further detail.

Example 1 Polytetrafluoroethylene and etched metal support (VA-Metal (oplast) was laminated to an experimental steel plate.

Thickness of layer for sliding: 0.48mm Temperature of heated plate: 375-385 Pressure of heated plate: 6-10 bar Intermediate layer material: Registered trademark Ho5ta flon TFM4025 Intermediate layer thickness before lamination: 0.25 nm Thickness of intermediate layer after lamination: Approximately 0.20 nm Result of shear force test: = 106 N/cm2 Room temperature = 7ON/cm” 200℃ Example 2 Experiments on etched and unetched metal supports Thickness of sample before lamination: 1.1On+n+Thickness of sample after lamination: 1.00mm Temperature of heated plate = 290℃ Pressure of heated plate 6-10 bar Inserted middle layer: Registered trademark Ho5taflon ET6235 (ETFE) Layer to make it: Same as Example 1 Elevated temperature of etched and unetched VA-Metaloplast I tested it.

Shear force test results Room temperature 133 91 Layer for sliding: PTFE with filled carbon content of 35% Thickness: 0.5 mm Middle layer: TFM with 30% SiC content Thickness: 0.25mm Temperature of heated plate = 390℃ Pressure of heated plate 2 bar Shear force test results The membrane did not peel off, but tore.

Example 4 (no middle layer) Sliding layer: TFM + 25% + 5% graphite (no etching) ( Pressed directly onto the steel. ) Thickness: 0.25noe Temperature of heated plate: 380℃ Pressure of heated plate 2 bar Shear force test results Room temperature: =150 ON/cm2 100℃:=108ON/cm” 150℃: = 22 ON/cm2 Example 5 Layer for sliding: Polyimide (Kapton Type M (DuFont) ) Thickness: 0.125mta Example 5 Layer for sliding: Polyimide (Kapton Type M (DuPont) ) Thickness: 0.125mm Adhesive sheet: TFM sheet (same as Example 1) Thickness: 00-25JI1 Temperature of heated plate = 395℃ Pressure of heated plate 5Qbar Shear force test results The sheet tore without peeling.

Example 6-8 Test condition: Sample size: 25X25mm Pulling force: 0.100kg Temperature: Repeat the process of raising the temperature by 5℃ in 3 minutes and holding this temperature for 3 minutes. Example 6 Layer for sliding: Metalloplast MP2 (=plastic + bronze mesh) Middle layer: ETFE Preparation of sample: Metalloplast MP2 + ETFE sheet (0 ゜5mm chrome plated) metal plate at a tool temperature of 310°C and a pressure of 3t. pressed for seconds Shear force test results: 5 samples peeled off at 300°C.

Example 7 Layer for sliding: Metalloplast MP2 Middle layer: PFA sheet Preparation of sample: Metalloplast MP2 + PPA sheet (0° 5mm chrome plating) metal plate for 25 seconds at a tool temperature of 385℃ and a pressure of 3t. pressed for a while Shear force test results = 5 samples are 380°, 385°, 386°, 387°, It peeled off at 390°C.

Example 8 Layer for sliding: Metalloplast MP2 Middle layer: TFM sheet Preparation of sample: Metalloplast MP2 + TPM sheet (0° 5 open chrome plating) was pressed onto a metal plate with a pressure of 3 tons. Results of shear force test: None of the samples peeled off at 410°C.

Meanings of symbols listed in the examples @: PTFE = polytetrafluoroethylene TFM = modified polytetrafluoroethylene (= perfluoroalkyl vinyl ether and tetrafluoroethylene according to the invention) copolymer with Ren) ETFE = copolymer of ethylene and tetrafluoroethylene. Here thermoplastic fluoropolymers.

PFA = copolymer of perfluorovinyl ether and tetrafluoroethylene . This product is chemically similar to TFM, but its high ether content makes it a thermoplastic. be.

Submission of translation of written amendment (Article 184-8 of the Patent Law) October 28, 1991

Claims (14)

[Claims] 1. It consists of a metal support and a layer applied directly onto it, which forms the formula CF2=CF-O-Rf (wherein Rf is perfluoroethyl, perfluoro-n-propyl or perfluoro-n-propyl Perfluoroalkyl vinyl ether represented by (representing a fluoro-n-butyl group) and tetrafluoroethylene copolymer (PTA or TFM) , and this layer is a sliding layer or a sliding layer made of plastic. A maintenance-free sliding bearing forming an intermediate layer with a second layer on top. 2. A sliding support according to claim 1, wherein the sliding layer has a thickness of up to 1.5 mm. Acceptance. 3. Metal support has a smooth surface A sliding bearing according to claim 1. 4. The sliding bearing according to claim 1 or 2, wherein the metal support has a roughened surface. . 5. The metal support consists of steel A sliding support according to any one of claims 1 to 4. 6. Copolymer of perfluoroalkyl vinyl ether and tetrafluoroethylene The sliding layer applied over the layer of rimmer is perforated and/or is a breathable plastic sheet A sliding support according to any one of claims 1 to 4. 7. Copolymer of perfluoroalkyl vinyl ether and tetrafluoroethylene The layer applied on top of the layer consisting of reamer is made of polytetrafluoroethylene or polyester. A sliding layer made of imide or polyetherketone (PEEK) A sliding support according to any one of claims 1 to 6. 8. Copolymer of perfluoroalkyl vinyl ether and tetrafluoroethylene The thickness of the sliding layer of plastic applied on top of the layer of rimmer and/or to improve heat transfer and/or wear resistance. according to any one of claims 1 to 7, in which one or more filler materials are added. sliding bearing. 9. Filling materials include carbon, alumina, ceramic materials, glass, bronze, and disulfide. molybdenum or silicon carbide mesh, powder or fiber A sliding bearing according to claim 8. 10. The sliding support according to claim 8 or 9, wherein the content of the filler material is 1 to 40% by volume. Acceptance. 11. 10. The sliding bearing according to claim 9, wherein the content of filler material is 5 to 30% by volume. 12. A combination of tetrafluoroethylene and perfluoroalkyl vinyl ether An intermediate layer consisting of a polymer is used as a filler material such as carbon, alumina, or ceramic. materials, glass, bronze, molybdenum disulfide or silicon carbide mesh, powder or contains fibers A sliding support according to any one of claims 1 to 11. 13. The sheet is bonded flush to the support by pressure and heat. The method for manufacturing a sliding support according to any one of claims 1 to 11. 14. roughening the surface of a metal support before applying a sliding layer on top 14. The method according to claim 13.