CN101929506B - A kind of winding fiber reinforced self-lubricating composite bearing and its manufacturing method - Google Patents

Abstract

The invention discloses a fiber wound reinforced self-lubricating composite bearing and a manufacturing method thereof. The bearing comprises an inner winding layer and an outer winding layer, the inner winding layer is formed by the way that polytetrafluoroethylene fiber and other high wearable fiber are mixed and dipped by resin glue solution and then winding is carried out, wherein other wearable fiber is one or two of aramid fiber, polyester fiber, ultrahigh molecular weight polyethylene fiber and carbon fiber; and the outer winding layer is wound on the inner winding layer by virtue of alkali-free long glass fiber dipped in resin glue solution, thus being as the backing of the bearing. The fiber wound reinforced self-lubricating composite bearing of the invention has the characteristics of high bearing capacity, good wear resistance and low cost, can be used for preparing self-lubricating radial sliding bearing and is widely applied to lubrication free work places in rotating, swinging, reciprocating and sliding motion modes.

Description

A kind of winding fiber reinforced self-lubricating composite bearing and its manufacturing method

technical field

The invention relates to a self-lubricating composite sliding bearing and a manufacturing method thereof, in particular to a winding fiber reinforced self-lubricating composite sliding bearing and a manufacturing method thereof.

technical background

In recent years, with the massive consumption of non-ferrous metals and the increase in the cost of non-ferrous metals, the technology of replacing metal materials with organic polymer materials as structural and functional components has achieved rapid development. Fiber-reinforced epoxy resin composites are a type of high-strength reinforced materials. Because such materials have the characteristics of high hardness and high strength of thermosetting resins, the reinforced materials have excellent mechanical properties. Fiber-reinforced resin-based self-lubricating composite bearings have been one of the key directions in the research and development of new bearings because of their advantages such as good self-lubricating performance, corrosion resistance, shock absorption and dryness reduction, resistance to foreign matter intrusion damage, low cost, and energy saving. The Chinese invention patent with the patent number CN87102143 discloses a fiber-reinforced molding plastic type water-lubricated anti-friction and anti-wear material. The main components are cheap and easy-to-get phenol-formaldehyde resin and absorbent cotton fiber. The molding method can conveniently form various sliding friction parts, and no substances polluting the environment and endangering the health of operators are produced during the preparation and molding process. This kind of material is used to manufacture submersible pump motor guide bearings and thrust disc friction plates. Water is used as the lubricating medium to have good anti-friction and anti-wear properties under high-speed and high-load working conditions. However, since such materials are prepared by compression molding, only flat plate-shaped materials can be prepared, which are suitable for making gaskets or flat thrust bearings. The Chinese utility model patent with the publication number CN2482605 discloses a composite bearing, which includes a non-metallic inner layer and a metal outer layer. Blended. The bearing has a simple structure and is easy to form and manufacture. It can be made into sliding bearings of various shapes according to needs. It has strong bearing capacity, good rigidity, high strength and hardness, excellent self-lubrication, wear resistance and excellent anti-corrosion resistance. Pollution and corrosion resistance. However, since the organic fibers used in this type of bearing exist in the form of mixed weaving cloth, the cost is relatively high, and the bearing is only suitable for the preparation of thin-walled sliding bearings.

Contents of the invention

The technical problem to be solved by the present invention is to propose a winding fiber reinforced self-lubricating composite bearing with high load capacity, good wear resistance and low cost and its manufacturing method.

In order to solve the above technical problems, a fiber-wound reinforced self-lubricating composite bearing of the present invention includes an inner winding layer and an outer winding layer. The other wear-resistant fibers are made of one or two of aramid fiber, polyester fiber, ultra-high molecular weight polyethylene fiber or carbon fiber; the outer winding layer is made of alkali-free long glass fiber and resin The glue solution is impregnated and wound on the inner winding layer as the backing of the bearing.

A method for manufacturing a fiber-wound reinforced self-lubricating composite bearing, comprising the following process steps:

1. Prepare resin glue: weigh epoxy resin, curing agent, curing accelerator, filler, and organic additives in proportion, stir with a high-speed mixer, and put it into the glue pool in the winding machine after being uniform ,stand-by.

2. Prepare the mandrel: polish and clean the mandrel;

3. Prepare the inner layer material of the bearing: twist polytetrafluoroethylene (PTFE) continuous long fibers and other wear-resistant fibers together to form a mixed fiber, and the fiber degree of the polytetrafluoroethylene (PTFE) fibers is 150-500D. The other wear-resistant fibers are one or a mixture of aramid fiber, polyester fiber, ultra-high molecular weight polyethylene fiber or carbon fiber, and the fiber degree is 200-1000D.

4. Inner layer of winding bearing: using a winding machine, the resin glue solution prepared by impregnating the above-mentioned mixed fibers is wound on the mandrel, the winding angle is 30°-85°, and the winding thickness is 0.45mm-0.55mm.

5. Prepare the backing layer: Wind the alkali-free long glass fiber impregnated with the glue solution on the inner lining layer as the backing layer of the bearing. The fiber winding angle is 30°～85°, and the yarn width is 10mm～ 25mm;

6. Curing and molding: Take off the primary product of the wound bearing, place it together with the mandrel in an oven for curing, the curing temperature is 100°C-180°C, and the time is 6-15 hours; after the curing is complete, the bearing wool The product is taken out of the oven together with the mandrel.

7. Subsequent processing: process the outer surface of the cured bearing wool together with the mandrel on a lathe, leaving a part of the machining allowance; then remove the film, take the bearing product out of the mandrel, and process it to the requirements according to the height of the bearing Dimensions, and the outer diameter of the bearing is processed to the required tolerance range to obtain the finished bearing.

In the above-mentioned method for manufacturing a fiber-wound reinforced self-lubricating composite bearing, when preparing the mandrel, after the mandrel is polished and cleaned, the surface of the mandrel is sprayed or wiped with a corresponding high-temperature-resistant release agent, and the release agent It is one or a mixture of silicone oil and polyvinyl alcohol.

In the above-mentioned method for manufacturing a fiber-wound reinforced self-lubricating composite bearing, when preparing the backing layer, the alkali-free long glass fibers are properly wetted before dipping, and the fiber degree of the alkali-free glass fibers is 200- 3000Tex.

In the above method for manufacturing the fiber-wound reinforced self-lubricating composite bearing, the epoxy resin used to prepare the resin glue is liquid bisphenol A epoxy resin, and the epoxy value is 0.35-0.55eq/100g.

Above-mentioned a kind of manufacturing method of winding fiber reinforced self-lubricating composite bearing, the used described curing agent of preparation described resin glue adopts methyltetrahydrophthalic anhydride (MeTHPA) or hexahydrophthalic anhydride (HHPA), and its consumption is 60～90% (calculated in parts by mass) of the epoxy resin;

In the above-mentioned method for manufacturing a fiber-wound reinforced self-lubricating composite bearing, the curing accelerator used to prepare the resin glue is a tertiary amine or imidazole curing accelerator, and the dosage is 0.2 to 5% of the epoxy resin (calculated in parts by mass);

In the above-mentioned manufacturing method of fiber-wound reinforced self-lubricating composite bearings, the filler used to prepare the resin glue is graphite, molybdenum disulfide, polytetrafluoroethylene (PTFE), copper powder, zinc stearate, quartz sand One or more than one of the mixtures, the dosage is 2 to 20% (calculated in parts by mass) of the epoxy resin;

In the above-mentioned method for manufacturing a fiber-wound reinforced self-lubricating composite bearing, the organic auxiliary agent used to prepare the resin glue includes a wetting agent and a coupling agent, and the wetting agent is made of a non-ionic siloxane copolymer. One of nonionic wetting agent (Troysol S366) or polyethylene glycol octyl phenyl ether (X-350), the dosage is 0.1-2% of the epoxy resin component (calculated in parts by mass) ; The coupling agent is a silane coupling agent, and the dosage is 0.1-2% (calculated in parts by mass) of the epoxy resin.

In the present invention, the self-lubricating composite sliding bearing made of winding polytetrafluoroethylene continuous long fiber and wear-resistant fiber as the self-lubricating lining of the composite bearing, and winding the alkali-free long glass fiber as the backing layer can replace the traditional copper alloy bearing and Copper alloy embedded solid lubricating bearings. The winding fiber reinforced self-lubricating composite bearing of the present invention has the characteristics of high load-carrying capacity, good wear resistance, and low cost, and can prepare self-lubricating radial sliding bearings, which are widely used in oil-free bearings in rotation, swing, reciprocating and sliding motion modes. Lubricate the workplace. During production, the mandrel is polished and cleaned to ensure the smoothness of the core surface. Before winding, the corresponding high-temperature-resistant release agent is sprayed or wiped on the surface of the mandrel to facilitate the release of the film. Proper wetting of the alkali-free long glass fiber before dipping can ensure the wettability of the alkali-free glass fiber.

Description of drawings

Fig. 1 is a schematic diagram of the longitudinal section structure of the self-lubricating composite bearing of the present invention;

FIG. 2 is a schematic diagram of the lateral structure relative to FIG. 1 .

Detailed ways

Example 1

As shown in the figure, a wound fiber reinforced self-lubricating composite bearing of the present invention includes an inner winding layer 1 (bearing inner layer) and an outer winding layer 2 (backing layer), and its manufacturing method includes the following process steps:

1. Preparation of resin glue.

Epoxy resin E44, methyltetrahydrophthalic anhydride (MeTHPA), 2-ethyl-4 methylimidazole, quartz sand, polyethylene glycol octylphenyl ether, γ-aminopropyltriethoxysilane (KH550 ) are weighed according to the ratio in the table below, and stirred with a high-speed stirrer. After being uniform, put it into the glue pool in the winding machine for use.

Component Ratio (in parts by mass) Epoxy resin E44 100 Methyltetrahydrophthalic anhydride (MeTHPA) 60 2-Ethyl-4 methylimidazole 1.0 Quartz sand 5  Polyethylene glycol octylphenyl ether 0.5 γ-Aminopropyltriethoxysilane (KH550) 1.5

2. Mandrel preparation.

Before winding, the carbon steel mandrel is polished and cleaned to ensure the surface finish of the mandrel. At the same time, in order to facilitate the release of the film, before winding, spray or wipe the high temperature resistant release agent simethicone on the surface of the mandrel.

3. Preparation of bearing inner layer material.

One strand of self-lubricating PTFE continuous long fiber (fiber degree 500D), one strand of polyester fiber (fiber degree 1500D) and one strand of aramid fiber (fiber degree 200D) were wound together to form a mixed fiber.

4. Wrap the inner layer of the bearing.

The above-mentioned mixed fibers are impregnated with the prepared resin glue solution and wound together on the mandrel. The dimension winding angle is 55°, and the winding thickness is 0.5mm.

5. Preparation of the backing layer.

After the surface of the bearing inner layer material is relatively dry, use a winding machine to pass the non-alkali glass long fiber (600Tex fiber) through the glue pool and wind it on the metal mandrel. The winding angle is 65°, the width of the yarn sheet is 20mm, and the number of winding layers is 6 layers.

6. Curing and molding

After the winding is completed, the product is placed in an oven, the curing temperature is 120°C, and the curing time is 8 hours.

7. Subsequent processing

Take out the cured bearing wool together with the mandrel from the oven, process the outer surface on the lathe, leaving a part of the machining allowance; then remove the film, take the bearing product out of the mandrel, and process it to the required size according to the height of the bearing , and the outer diameter of the bearing is processed to the required tolerance range to make the finished bearing of the present invention.

Example 2

A method for manufacturing a fiber-wound reinforced self-lubricating composite bearing, comprising the following process steps:

1. Preparation of resin glue.

Epoxy resin E51, hexahydrophthalic anhydride (HHPA), 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30), molybdenum disulfide, nonionic siloxane copolymer ( Troysol S366), γ-glycidyl etheroxypropyl trimethoxysilane (KH560), weighed according to the ratio in the table below, and stirred with a high-speed stirrer. After being uniform, put it into the glue pool in the winding machine. use.

Component Ratio (in parts by mass) Epoxy resin E51 100 Hexahydrophthalic anhydride (HHPA) 90 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30) 4.0 Molybdenum disulfide 15 Non-ionic siloxane copolymer (Troysol S366) 1.5 γ-Glycidyl etheroxypropyl trimethoxysilane (KH560) 0.5

2. Mandrel preparation.

Before winding, the mandrel is polished and cleaned to ensure the surface finish of the mandrel. At the same time, in order to facilitate the release of the film, before winding, spray or wipe the high temperature resistant release agent polyvinyl alcohol on the surface of the mandrel. Mandrel made of metal material

3. Preparation of bearing inner layer material.

One strand of self-lubricating PTFE continuous long fiber (fiber degree 200D), one strand of ultra-high molecular weight polyethylene fiber (fiber degree 1300D) and one strand of carbon fiber (fiber degree 200D) were wound together to form a mixed fiber.

4. Wrap the inner layer of the bearing.

The above-mentioned mixed fibers are impregnated with the prepared resin glue solution and wound together on the mandrel. The dimension winding angle is 70°, and the winding thickness is 0.55mm.

5. Preparation of the backing layer.

After the surface of the inner layer material of the above-mentioned bearing is relatively dry, use a winding machine to pass the long fiber of non-alkali glass (with a fiber degree of 2000Tex) through the glue pool and wind it on the metal mandrel. The winding angle is 45°, the width of the yarn sheet is 10mm, and the number of winding layers is 6 layers.

6. Curing and molding

After the winding is completed, the product is placed in an oven, the curing temperature is 160°C, and the curing time is 5 hours.

7. Subsequent processing

Take out the cured bearing wool together with the mandrel from the oven, process the outer surface on the lathe, leaving a part of the machining allowance; then remove the film, take the bearing product out of the mandrel, and process it to the required size according to the height of the bearing , and the outer diameter of the bearing is processed to the required tolerance range to make the finished bearing of the present invention.

In the manufacture method of self-lubricating composite bearing of the present invention, the curing accelerator that is used to prepare resin glue can adopt except 2,4,6-three (dimethylaminomethyl) phenol (DMP-30) and 2-ethyl- 4 Tertiary amine or imidazole curing accelerators other than methylimidazole, fillers can be powders with excellent lubrication or wear resistance, such as graphite, molybdenum disulfide, polytetrafluoroethylene (PTFE), copper powder, stearin One or more mixtures of acid zinc and quartz sand, the wetting agent in the organic additive mainly plays the role of wetting, dispersing and defoaming in the resin glue, and non-ionic siloxane copolymer can be used One of the non-ionic wetting agents (Troysol S366) or polyethylene glycol octylphenyl ether (X-350), the coupling agent can be other than γ-aminopropyl triethoxysilane (KH550) other silane coupling agents. The release agent sprayed or wiped on the surface of the mandrel can use other silicone oil or polyvinyl alcohol, or a mixture of silicone oil and polyvinyl alcohol. The wear-resistant fiber in the inner layer material can be one or a mixture of aramid fiber, polyester fiber, ultra-high molecular weight polyethylene fiber or carbon fiber.

Claims (2)

1. the production method of a fiber wound reinforced self-lubricating composite bearing is characterized in that, it comprises following process step:

(1), the preparation resin adhesive liquid: with the weighing in proportion of epoxy resin, curing agent, curing accelerator, filler, organic additive, utilize homogenizer to stir, treat evenly after, insert in the glue pond in the Stetch Wrapping Machine, for use;

(2), prepare plug: plug is polished and cleaned; At mandrel surface spraying or the corresponding high temperature resistant remover of obliterating, said remover is one or both the mixture in silicone oil, the polyvinyl alcohol;

(3), preparation bearing inner layer material: a kind of blend fiber is formed in other abrasion resistant fibrous common winding of teflon continuous long fiber peacekeeping; The fibrousness of said polytetrafluoroethylene fiber is 150～500D; The mixture of one or both in said other abrasion resistant fibrous employing aramid fibre, polyester fibre, superhigh molecular weight polyethylene fibers or the graphite fiber, fibrousness is 200～1000D;

(4), twine the bearing internal layer: utilize Stetch Wrapping Machine, above-mentioned blend fiber is wrapped on the plug through the said resin adhesive liquid that dipping prepares, winding angle is 30 °～85 °, and winding thickness is 0.45mm～0.55mm;

(5), preparation back sheet: earlier with suitable wetting of alkali-free continuous glass-fiber, the fibrousness of said alkali-free continuous glass-fiber is 200～3000Tex; Be wrapped on the inside liner after more said alkali-free continuous glass-fiber being flooded glue, with the back sheet as bearing, its fiber winding angle is 30 °～85 °, and yarn width is at 10mm～25mm;

(6), solidifying: the bearing first product that winds is taken off, be positioned in the baking oven together with plug and be cured, solidifying temperature is 100 ℃～180 ℃, and the time is 6～15 hours; After treating completion of cure, bearing hair article are taken out from baking oven together with plug;

(7), following process: the bearing hair article after will solidifying carry out the processing of outer surface together with plug on lathe, stay part machining allowance; Demoulding takes out the bearing goods from plug then, is worked into the requirement size by bearing height, and bearing outside diameter is machined to needed tolerance range, gets bearing completed products.

2. the production method of a kind of fiber wound reinforced self-lubricating composite bearing as claimed in claim 1 is characterized in that, prepares the used said epoxy resin of said resin adhesive liquid and adopts the liquid bisphenol A type epoxy resin, and epoxide number is 0.35～0.55eq/100g; Preparing the used said curing agent of said resin adhesive liquid and adopt methyl tetrahydro phthalic anhydride or hexahydrophthalic anhydride, is 60～90% of said epoxy resin in its consumption of mass fraction; Preparing the used said curing accelerator of said resin adhesive liquid and adopt tertiary amines or imidazoles curing accelerator, is 0.2～5% of said epoxy resin in the mass fraction consumption; Preparing the used said filler of said resin adhesive liquid and adopt one or more the mixture in graphite, molybdenum disulfide, teflon, copper powder, zine stearate, the silica sand, is 2～20% of said epoxy resin in its consumption of mass fraction; Prepare the used said organic additive of said resin adhesive liquid and comprise wetting agent and coupling agent; Said wetting agent adopts a kind of in nonionic wetting agent or the Triton X-100 of nonionic siloxane copolymer, is 0.1～2% of said epoxy resin component in its consumption of mass fraction; Said coupling agent adopts silane coupling agent, is 0.1～2% of said epoxy resin in its consumption of mass fraction.

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