JP4928410B2 - Manufacturing method of multilayer sliding member - Google Patents

Description

  The present invention relates to a method for manufacturing a multilayer sliding member used for a sliding bearing or the like.

  Conventionally, as a sliding member such as a bearing having a low friction sliding portion only on the surface layer, for example, Patent Document 1 and Patent Document 2 have been proposed. Patent Document 1 relates to a laminated sliding member, and Patent Document 2 relates to a bearing manufacturing method in which an unwoven fabric of a fluororesin fiber and another fiber is used as a low friction sliding surface. In Patent Document 3, a mixed liquid obtained by uniformly mixing solid lubricant particles and a thermosetting resin liquid is pressurized and filled into the fiber structure gap of the base material from one side of the sheet-like reinforcing base material. There is disclosed a method for manufacturing a sliding member comprising the steps of: attaching a thermosetting resin having adhesiveness to the thermosetting resin liquid to the other surface of the substrate. In Patent Document 4, (a) a step of cutting a resin-processed sheet base material having a low coefficient of friction into a desired size, and scooping it into a core metal of a molding die, (b) resin using a thermosetting synthetic resin (C) a step of preforming the processed chip base material into a shape close to a desired molded product using a mold; and (c) a molding die having a core metal to which a resin processed sheet base material is attached. Loading, heating the overdue, and simultaneously pressing the contents in the axial direction of the core metal by a pressing die to integrally compress and mold the resin processed sheet base material and the chip base material. The manufacturing method of the synthetic resin sliding member which has a low friction sliding surface layer in the inner-hole surface which consists of a process of ()) is disclosed.

  As in Patent Document 1, in the case of a molded product having a laminated structure, if it is flat, semi-cylindrical or hemispherical, a resin processing sheet having low friction is disposed on the surface layer, and a normal compression molding method is used. Can be molded without any trouble. Moreover, even if it is a cylindrical or long pipe shape, the laminate can be easily formed by the laminated tube forming method (rolled forming method).

Japanese Examined Patent Publication No. 39-14852 Japanese Examined Patent Publication No. 47-50893 JP 56-160423 A JP-A-57-100134

  However, when the base portion of the resin processed sheet of the surface layer has a laminated structure as in Patent Document 1, the load resistance when used as a sliding member such as a bearing is inferior, and the range of use as a sliding member by itself is poor. There is a problem of being limited. Therefore, when the base portion of the resin processed sheet of the surface layer is a metal cylindrical body, for example, a steel pipe, the laminated pipe forming method cannot be adopted as a matter of course. Patent Document 2 is a manufacturing method devised to prevent such wrinkles and displacement of the low friction sliding surface layer disposed on the inner surface of the cylinder, but the technology disclosed herein employs a compression molding method. Eliminating and adopting injection molding and transfer molding (such as die-casting when the base is a metal), but not only has a complicated manufacturing method, but also has a thin surface layer. There is also a problem that the range of use as a sliding member is limited.

  The present invention has been made in view of the above-mentioned points, and the object of the present invention is not to require a large-sized facility and not only to significantly reduce the manufacturing cost but also to be integrated with the inner surface of the cylinder of the back metal. Dimensional accuracy can be ensured without requiring any machining or the like on the surface of the sliding face material joined to the product, and the product cost can be reduced. It is an object of the present invention to provide a method for producing a multilayer sliding member that exhibits excellent friction and wear characteristics in use.

  A manufacturing method of a multilayer sliding member according to the present invention includes a cylindrical back metal made of a metal cylinder and a sliding layer of a sliding surface material integrally formed on the cylindrical inner surface of the cylindrical upper back metal. And (a) an impregnation applying step of impregnating and applying a thermosetting synthetic resin varnish containing a tetrafluoroethylene resin powder to a woven fabric containing spun yarns of synthetic fibers; (B) In the impregnation coating step, the resulting woven fabric is dried to obtain 25 to 35 wt% of tetrafluoroethylene resin, 25 to 50 wt% of thermosetting synthetic resin, and 25 to 50 wt% of woven fabric. A sliding surface material manufacturing step for manufacturing the sliding surface material, and (c) the sliding surface material obtained in the sliding surface material manufacturing step, the developed length of the cylindrical inner surface of the cylindrical back metal and the sliding surface material A cutting and laminating step of laminating and laminating a plurality of sheets while cutting into a dimension corresponding to the height of the cylindrical backing metal, d) A laminated sliding face material producing step of producing a laminated sliding face material by heating and pressing the laminated sliding face material obtained in the cutting and laminating process in the laminating direction; e) The laminated sliding face material obtained in the laminated sliding face material manufacturing step is bent under heating, and the laminated sliding face material has a curvature that matches the curvature of the cylindrical inner surface of the cylindrical backing metal. A pre-cylindrical laminated sliding face material forming step for forming into a pre-cylindrical laminated sliding face material having butt ends at both ends, and (f) a preliminary obtained in the pre-cylindrical laminated sliding face material forming step Forming an adhesive layer on the cylindrical outer surface of the cylindrical laminated sliding face material, and forming an adhesive layer on the cylindrical inner surface of the cylindrical back metal made of the metal cylinder, and (g) forming the adhesive layer The cylindrical cylindrical sliding surface material obtained in the process is coated with an adhesive and the cylindrical outer surface is coated with the cylindrical backing plate. An insertion step of inserting into the cylindrical inner surface of the cylindrical backing metal in contact with the adhesive layer formed on the cylindrical inner surface; (h) on the inner surface of the preliminary cylindrical laminated sliding face material inserted into the cylindrical inner surface of the cylindrical backing metal; A metal pipe press-fitting process for press-fitting a metal pipe having a large thermal expansion coefficient, and (i) drying the cylindrical backing metal, the preliminary cylindrical laminated sliding face material and the metal pipe obtained in the metal pipe press-fitting process. A drying step of drying in a furnace at a temperature of 150 to 200 ° C. for 20 to 40 minutes, and (j) cooling the cylindrical backing metal, preliminary cylindrical laminated sliding face material and metal pipe obtained in the drying step, A cooling step of removing the metallic pipe by contraction, and in the drying furnace, the preliminary cylindrical laminated sliding face material is pressed against the cylindrical inner surface side of the cylindrical backing metal by thermal expansion outward in the radial direction of the metallic pipe, A sliding layer made of a sliding surface material is used as the back metal cylinder. It is characterized by being integrally joined to the inner surface.

  The cylindrical back metal is preferably made of a steel pipe.

  The woven fabric is formed from at least one spun yarn of synthetic fiber selected from polyester fiber, polyvinyl alcohol fiber and aramid fiber.

  The woven fabric is preferably formed from a twisted yarn of a synthetic yarn selected from polyester fiber, polyvinyl alcohol fiber and aramid fiber and a filament yarn or spun yarn of ethylene tetrafluoride resin fiber.

  The woven fabric is a woven fabric selected from each of a plain weave, a twill weave, a satin weave, a change plain weave, a change twill weave, a change satin weave change structure, a mixed structure of a mihara structure and a change structure.

  The thermosetting synthetic resin is one of synthetic resins selected from a resol type phenol resin, an epoxy resin, and an unsaturated polyester resin.

    According to the method for manufacturing a multilayer sliding member of the present invention, a metal pipe having a large coefficient of thermal expansion is provided on the inner surface of a pre-cylindrical laminated sliding surface material inserted into a cylindrical inner surface of a back metal plate made of a metal cylinder. In the step of press-fitting and drying them in a drying furnace at a temperature of 150 to 200 ° C. for 20 to 40 minutes and then cooling, the sliding due to the radially outward thermal expansion generated in the metal pipe In the face material, a high pressure is continuously applied to the inner surface of the cylinder of the back metal, and the slide surface material is pressed against the inner surface of the cylinder of the back metal. Are firmly joined and integrated. Since this manufacturing method does not require any large equipment, not only can the manufacturing cost be remarkably reduced, but also the surface of the sliding face material integrally joined to the cylindrical inner surface of the back metal. Since the dimensional accuracy can be ensured without requiring machining or the like, the product cost can be reduced.

  Further, the obtained multi-layer sliding member has a sliding layer which is a sliding surface supported by a cylindrical inner surface of a back plate made of a metal cylinder and is formed of a laminated sliding surface material, and its thickness. Is formed thick so that it exhibits excellent friction and wear characteristics in high load applications and use under dry friction conditions.

  According to the present invention, since no large-scale equipment is required, not only the manufacturing cost can be remarkably reduced, but also the sliding face material as a sliding layer integrally joined to the cylindrical inner surface of the back metal. Since the dimensional accuracy can be ensured without requiring any machining or the like on the surface, the product cost can be reduced and the sliding surface is supported by the inner surface of the back metal cylinder. Since the sliding layer is made of laminated sliding face material and its thickness is thick, it is a multi-layer that exhibits excellent friction and wear characteristics in high load applications and use under dry friction conditions The manufacturing method of a sliding member can be provided.

Hereinafter, the manufacturing method of the multilayer sliding member of this invention is demonstrated in detail.
The manufacturing method of the multilayer sliding member of the present invention comprises a cylindrical backing metal made of a metal cylinder and a sliding layer of a sliding face material integrally formed on the cylindrical inner surface of the cylindrical backing metal. A method for producing a multi-layer sliding member, comprising: (a) an impregnation application step of impregnating and applying a thermosetting synthetic resin varnish containing a tetrafluoroethylene resin powder to a woven fabric containing spun yarns of synthetic fibers; (B) In the impregnation coating step, the resulting woven fabric is dried and consists of 25 to 35% by weight of tetrafluoroethylene resin, 25 to 50% by weight of thermosetting synthetic resin, and 25 to 50% by weight of woven fabric. A sliding surface material manufacturing step for manufacturing the sliding surface material, and (c) a sliding surface material obtained in the sliding surface material manufacturing step, the developed length of the cylindrical inner surface of the cylindrical back metal and the cylinder A cutting and laminating step of cutting a dimension corresponding to the height of the metal back metal and laminating a plurality of these by overlapping (d) A laminated sliding face material producing step of producing a laminated sliding face material by heating and press-molding a plurality of laminated sliding face materials obtained in the cutting and laminating process in a laminating direction; and (e) The laminated sliding face material obtained in the laminated sliding face material manufacturing step is bent under heating, and the laminated sliding face material has a curvature that matches the curvature of the cylindrical inner surface of the cylindrical backing metal. A pre-cylindrical laminated sliding face material forming step for forming a pre-cylindrical laminated sliding face material having butt ends at both ends, and (f) a pre-cylindrical laminated layer obtained in the pre-cylindrical laminated sliding face material forming step. Forming an adhesive layer on the cylindrical outer surface of the sliding face material, and forming an adhesive layer on the cylindrical inner surface of the cylindrical back metal made of the metal cylinder; and (g) the adhesive layer forming step. The cylindrical outer surface coated with the adhesive on the preliminary cylindrical laminated sliding face material obtained by An insertion step of inserting into the cylindrical inner surface of the cylindrical backing metal in contact with the adhesive layer formed on the inner surface; (h) on the inner surface of the preliminary cylindrical laminated sliding face material inserted into the cylindrical inner surface of the cylindrical backing metal; A metal pipe press-fitting step for press-fitting a metal pipe having a large thermal expansion coefficient, and (i) a cylindrical back metal, a pre-cylindrical laminated sliding face material and a metal pipe obtained in the metal pipe press-fitting step. A drying step of drying at a temperature of 150 to 200 ° C. for 20 to 40 minutes, and (j) cooling the cylindrical backing metal, preliminary cylindrical laminated sliding face material and metal pipe obtained in the drying step, A cooling process in which the heat-resistant pipe is removed by contraction, and the pre-cylindrical laminated sliding face material is pressed against the cylindrical inner surface side of the cylindrical backing metal by thermal expansion outward in the radial direction of the metal pipe in the drying furnace. A sliding layer made of a moving surface material is used as a cylindrical inner surface of the backing metal. It is to be joined together.

  In the manufacturing method described above, a carbon steel pipe for machine structure (STKM13C) defined by JISG3445 is preferably used as the back metal made of a metal cylinder. The sliding surface material may be a woven fabric made of a synthetic fiber spun yarn, or a twisted yarn of a synthetic fiber spun yarn and a filament yarn or spun yarn of an ethylene tetrafluoride resin (hereinafter abbreviated as “PTFE”) fiber. And a thermosetting synthetic resin containing PTFE impregnated in the woven fabric. The synthetic fiber forming the woven fabric is preferably selected from at least one of polyester fiber, polyvinyl alcohol fiber (vinylon fiber), and aramid fiber. The polyester fiber is a polyester fiber generally obtained by polycondensation from a dicarboxylic acid component and a diol component. Examples of the carboxylic acid component of the polyester include terephthalic acid, isophthalic acid, and naphthalene-2,6-dicarboxylic acid. Examples of the diol component of the polyester include ethylene glycol, hydroquinone, bisphenol A, and biphenyl. Moreover, as both components, p-hydroxybenzoic acid, 2-oxy-6-naphthoic acid, etc. are mentioned. Polyvinyl alcohol fiber (vinylon fiber) is obtained by saponifying polyvinyl acetate with alkali to form polyvinyl alcohol (PVA), and wet or dry spinning the aqueous solution to form a fiber.

  Aramid fibers are roughly classified into para and meta types according to their molecular skeletons. The meta-aramid fiber is a fiber obtained by polycondensation polymetaphenylene isophthalamide (MPIA) using metaphenylenediamine (MPDA) and isophthalic acid dichloride (IPC) as raw materials. Specific examples of the meta-aramid fiber include “Conex (trademark of Teijin)” manufactured by Teijin.

  Para-aramid fibers are usually fibers having at least one amide bond, and having at least one benzene ring bonded at the para position. Examples thereof include polyparaphenylene terephthalamide fiber, polyparaphenylene diphenyl ether terephthalamide fiber, and copolyparaphenylene-3,4'-oxydiphenylene terephthalamide fiber. Specific examples of para-aramid fibers include DuPont in the United States, “Kevlar (trademark of DuPont)” manufactured by Toray DuPont, “Twaron (trademark of Twaron)” manufactured by Teijin Twaron, and Teijin "Technora (trademark of Teijin)".

  The above-described synthetic fiber spinning is preferably a spun yarn from the viewpoint of impregnating and holding a thermosetting synthetic resin described later, and a woven fabric is formed from the spun yarn of these synthetic fibers.

  As the woven fabric, in addition to the woven fabric composed of the spun yarn of the synthetic fiber, a woven fabric woven by using a twisted yarn of the spun yarn of the synthetic fiber and the filament yarn, the multifilament yarn and the spun yarn of the PTFE fiber. It may be a cloth. In the woven fabric using the twisted yarn, the PTFE fiber yarn exhibiting low friction is exposed on the surface. The thickness of the woven fabric can be adjusted as appropriate by the yarn count of the synthetic fiber used or the denier count of the filament yarn of PTFE fiber.

  The woven fabric is preferably a woven fabric selected from a plain weave, a twill weave, a satin weave, a change plain weave, a change twill weave, a change satin weave change structure, a mixed structure of a mihara structure and a change structure. . And the amount of the woven fabric contained in the sliding face material is suitably 25 to 50% by weight. If the amount of the woven fabric is less than 25% by weight, sufficient frictional wear characteristics are not exhibited, and if it exceeds 50% by weight, the amount of the thermosetting synthetic resin described later decreases, which may significantly impair the moldability. .

  The thermosetting synthetic resin used in the present invention is preferably a resol type phenol resin, an epoxy resin, an unsaturated polyester resin, or the like, and volatile solvents of these thermosetting synthetic resins include methanol, acetone, methyl ethyl ketone, and the like. It selects suitably by the thermosetting synthetic resin to be used. The amount of the thermosetting synthetic resin contained in the sliding face material is suitably 30 to 50% by weight. When the amount of the thermosetting synthetic resin is less than 30% by weight, the molding processability of the sliding face material is hindered, and when it exceeds 50% by weight, the mechanical strength of the sliding face material is lowered.

  PTFE contained in the thermosetting synthetic resin is pulverized by molding powder (hereinafter abbreviated as “high molecular weight PTFE”) and a molecular weight lower than that of the high molecular weight PTFE by irradiation or the like. PTFE which is easy and has good dispersibility and which is mainly used as an additive material (hereinafter abbreviated as “low molecular weight PTFE”) can be used.

  Specific examples of high molecular weight PTFE include “Teflon (registered trademark) 7J”, “Teflon (registered trademark) 7A-J”, “Teflon (registered trademark) 70-J” manufactured by Mitsui DuPont Fluorochemical Co., Ltd., Daikin Industries “Polyflon M-12 (trademark of Daikin Industries)” manufactured by Asahi Glass Co., Ltd., “Fluon G163 (trademark of Asahi Glass Co., Ltd.)”, “Fluon G190 (trademark of Asahi Glass Co., Ltd.)” manufactured by Asahi Glass, and the like.

  As specific examples of low molecular weight PTFE, Asahi Glass, such as “TLP-10F (product model number)” manufactured by Mitsui DuPont Fluorochemical Co., Ltd., “Lublon L-5 (trademark of Daikin Industries Co., Ltd.)” manufactured by Daikin Industries, Ltd., etc. “Kulon L150J (trademark of Asahi Glass Co., Ltd.)”, “Fullon L169J (trademark of Asahi Glass Co., Ltd.)”, etc., “KTL-8N (model number of Kitamura Co., Ltd.)” manufactured by Kitamura, etc.

  In the present invention, both the high molecular weight PTFE and the low molecular weight PTFE can be used, but when mixed with the thermosetting synthetic resin, the low molecular weight PTFE is used to uniformly disperse and make it difficult to generate voids. Is preferred. Moreover, the average particle diameter of PTFE powder is 1-50 micrometers from a viewpoint of disperse | distributing uniformly and preventing the production | generation of a void, Preferably it is 1-30 micrometers.

  The amount of PTFE contained in the sliding face material is suitably 10 to 30% by weight. If the amount of PTFE is less than 10% by weight, the effect of improving the friction and wear characteristics cannot be obtained, and if it exceeds 30% by weight, the viscosity of the resin increases during molding, and voids may be generated. There is a possibility that the adhesiveness of the thermosetting synthetic resin is lowered and the strength of the multilayer sliding member is lowered.

  Next, a manufacturing method of the above-described sliding surface material and a multilayer sliding member using the sliding surface material will be described based on preferred examples shown in the drawings.

  The sliding face material is produced as follows. FIG. 1 is an explanatory view showing an apparatus for manufacturing a sliding face material (resin-processed base material). In the manufacturing apparatus shown in FIG. 1, a reinforcing base material 2 made of a woven fabric wound around an uncoiler 1 is fed to a container 5 in which a thermosetting synthetic resin varnish 4 containing PTFE powder uniformly dispersed by a feed roller 3 is stored. The thermosetting synthetic resin varnish 4 is passed through the thermosetting synthetic resin varnish 4 stored in the container 5 by guide rollers 6 and 7 provided in the container 5, so that the thermosetting synthesis is performed on the surface of the reinforcing substrate 2. A resin varnish 4 is applied. Next, the reinforcing base material 2 coated with the thermosetting synthetic resin varnish 4 is sent to the compression rolls 9 and 10 by the feed roller 8 and applied to the surface of the reinforcing base material 2 by the compression rolls 9 and 10. The thermosetting synthetic resin varnish 4 is impregnated into the fiber structure gap.

  And the reaction of this resin varnish 4 is advanced simultaneously with the solvent being blown off in the drying furnace 11 with respect to the reinforcing base material 2 impregnated and coated with the thermosetting synthetic resin varnish 4, whereby PTFE is 25 to 35% by weight and heat A moldable sliding face material (resin processing base material) 12 made of 25 to 50% by weight of curable synthetic resin and 25 to 50% by weight of woven fabric is produced. The thickness of the sliding face material 12 formed in this way is approximately 0.2 to 0.5 mm. FIG. 2 is a perspective view showing the sliding face material thus produced. The solid content of the thermosetting synthetic resin varnish formed by dissolving the thermosetting synthetic resin in a volatile solvent is about 30 to 65% by weight, and the viscosity of the resin varnish is about 800 to 5000 cP, especially 1000. -4000 cP is preferred.

  Next, a multilayer sliding member using the sliding face material 12 and a manufacturing method thereof will be described.

  FIG. 3 is a perspective view of a cylindrical back metal made of a metal cylinder. A carbon steel pipe for machine structure is prepared as a cylindrical back metal 13 made of a metal cylinder, and an adhesive layer 15 is formed on a cylindrical inner surface 14 of the cylindrical back metal 13. The adhesive layer 15 is formed by dissolving an epoxy resin in acetone as a solvent, uniformly applying it to the cylindrical inner surface 14 of the cylindrical backing metal 13 as an adhesive, and drying it.

  FIG. 4 is a plan view showing the sliding face material cut into a dimension corresponding to the developed length of the cylindrical inner surface of the cylindrical backing metal and the height of the cylindrical backing metal. The sliding surface material (resin-processed base material) 12 is prepared, and the sliding surface material 12 has a length 11 corresponding to the developed length of the cylindrical inner surface 14 of the cylindrical back metal 13 and the height of the cylindrical back metal 13. After cutting into a dimension of length l2 corresponding to the length h, and laminating a plurality of the sliding face materials 12, they are heated and pressure-molded in the laminating direction to have a thickness of at least 1 mm. The laminated sliding face material 16 is produced. FIG. 5 is a cross-sectional view showing a laminated sliding face material.

  FIG. 6 is a perspective view showing a preliminary cylindrical laminated sliding face material. Under heating, the laminated sliding face material 16 is wound into a cylindrical shape having a curvature that matches the curvature of the cylindrical inner peripheral surface 14 of the cylindrical backing metal 13, and the laminated sliding face material 16 is butt end 17 at both ends. And 17 are formed into a preliminary cylindrical laminated sliding face material 18.

  An adhesive produced by dissolving an epoxy resin in acetone as a solvent is applied to the outer surface 19 of the preliminary cylindrical laminated sliding face material 18 and dried to form an adhesive layer 20.

  FIG. 7 is a perspective view showing the manufacturing process of the multilayer sliding member. After the preliminary cylindrical laminated sliding face material 18 is inserted into the cylindrical inner surface 14 of the cylindrical back metal 13, a metal pipe 22 having a large thermal expansion coefficient is press-fitted into the inner surface 21 of the preliminary cylindrical laminated sliding face material 18. . As the metal pipe 22, brass (thermal expansion coefficient 20.5 × 10 −6 / ° C.), aluminum bronze (thermal expansion coefficient 17 × 10 −6 / ° C.), austenitic stainless steel (thermal expansion coefficient 17.3 × 10-6 / ° C).

  In a state where the metal pipe 22 is press-fitted into the inner surface 21 of the preliminary cylindrical laminated sliding face member 18 inserted into the cylindrical inner surface 14 of the cylindrical backing metal 13, these are 20 to 20 ° C. at a temperature of 150 to 200 ° C. Allow to dry for 40 minutes and then cool.

  In this step, the metal pipe 22 thermally expands radially outward as the temperature in the drying furnace rises, and the pre-cylindrical laminated sliding face material 18 is strongly applied to the inner surface 14 side of the back metal 13 due to this thermal expansion. Thus, a multi-layer sliding member 24 in which the sliding layer 23 made of the sliding face material 18 is integrally joined to the cylindrical inner surface 14 of the back metal 13 is obtained. In this multi-layer sliding member 24, the butt end portions 17 and 17 at both ends formed on the preliminary cylindrical laminated sliding face material 18 are in contact with each other, so that no gap is generated in the sliding layer 23. FIG. 8 is a perspective view showing the multilayer sliding member thus completed.

  Thus, according to the above manufacturing method, since no large-scale equipment is required, not only the manufacturing cost can be remarkably reduced, but also a sliding layer as a sliding layer integrally joined to the cylindrical inner surface of the back metal. Since the dimensional accuracy can be ensured without requiring any machining or the like on the surface of the moving surface material, the product cost can be reduced. The obtained multilayer sliding member 24 has a sliding layer 23 formed of a laminated sliding surface material 16 as a sliding surface supported by a cylindrical inner surface 14 of a back metal 13 made of a metal cylinder. Since its thickness is formed thick, it exhibits excellent friction and wear characteristics in high load applications and use under dry friction conditions.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to a following example, unless the summary is exceeded.

  As a backing metal, a carbon steel pipe for mechanical structure (STKM13C) having an inner diameter of 50 mm, an outer diameter of 62 mm, and a length of 48 mm was prepared. The epoxy resin was dissolved in acetone as a solvent, and this was uniformly applied to the inner surface of the cylinder of the back metal as an adhesive and dried to form an adhesive layer on the inner surface of the cylinder.

  A plain woven fabric was prepared from spun yarns of para-aramid fibers (“Technola (trade name)” manufactured by Teijin) as synthetic fibers.

  100 parts by weight of an epoxy resin varnish having a resin solid content of 64.5% by weight and 20 parts by weight of a low molecular weight PTFE (“KTL-8N (trade name)” manufactured by Kitamura Co., Ltd.) powder having an average particle size of 1 to 30 μm are mixed. Then, 15 parts by weight of methanol was added thereto to prepare a mixed solution having a viscosity adjusted to 2750-2800 cps. This mixed solution was stored in the container of the manufacturing apparatus shown in FIG. In the manufacturing apparatus shown in FIG. 2, a reinforcing base material made of plain woven fabric wound around an uncoiler is fed to a container in which the mixed solution is stored by a feed roller, and is stored in the container by a guide roller provided in the container. Further, the mixture was applied to the surface of the reinforcing substrate by allowing the mixture to pass through. Next, the reinforcing base material coated with the mixed solution was fed to a compression roll by a feed roller, and the mixed solution coated on the surface of the reinforcing base material by a compression roll was impregnated to the fiber structure gap. Then, the reinforcing base material impregnated with the mixed solution is fed into the drying furnace, and the solvent in the reinforcing base material is blown off, and at the same time, the reaction of the mixed solution proceeds, and the reinforcing base material (plain woven fabric) is as low as 30% by weight. A moldable sliding surface material (resin-processed base material) composed of 31% by weight of PTFE and the remaining epoxy resin (39% by weight) was produced.

  This sliding face material is cut into a length corresponding to the developed length of the cylindrical inner surface of the back metal and a length corresponding to the height of the back metal, that is, a rectangular size of developed length 157 mm and height 48 mm. And after laminating | stacking this 4 sheets and laminating | stacking, it heated and pressure-molded in the lamination direction, and produced the lamination | stacking sliding face material of thickness 1mm or more which consists of a laminated body.

  Next, the laminated sliding face material is bent under heating, wound into a cylindrical shape having a curvature matching the curvature of the cylindrical inner surface of the back metal, and the laminated sliding face material has butt ends at both ends. It was formed into a preliminary cylindrical laminated sliding face material.

  An epoxy resin is dissolved in acetone as a solvent, and this is uniformly applied to the outer cylindrical surface of the preliminary cylindrical laminated sliding surface as an adhesive, and then dried and bonded to the outer cylindrical surface of the preliminary cylindrical laminated sliding surface. A layer was formed.

  After inserting a pre-cylindrical laminated sliding face material with an adhesive layer formed on the outer surface of the cylinder into the cylindrical inner surface of the backing metal, a metal pipe having a large thermal expansion coefficient is press-fitted into the inner surface of the pre-cylindrical laminated sliding face material. did. Brass (thermal expansion coefficient 20.5 × 10 −6 / ° C.) was used as the metal pipe.

  In a state where metal pipes are press-fitted into the inner surface of the preliminary cylindrical laminated sliding face material inserted in the inner surface of the back metal, they are dried in a drying furnace at a temperature of 180 ° C. for 30 minutes, cooled, and then dried. The multilayer sliding member which provided the sliding layer which consists of a laminated sliding face material in the cylindrical inner surface of the back metal was obtained. The thickness of the sliding layer was 1.0 mm.

  In this process, the metal pipe thermally expands radially outward as the temperature in the drying furnace rises, and the pre-cylindrical laminated sliding face material is strongly pressed against the cylindrical inner surface of the back metal by this thermal expansion. Thus, the laminated sliding face material is integrally joined to the inner surface of the cylinder of the back metal, and a sliding layer made of the laminated sliding surface material is formed on the inner surface of the cylinder of the back metal.

The multilayer sliding member produced in this way is
Load (surface pressure) 29MPa (300kgf / cm2)
Sliding speed 1m / min
Swing angle ± 45 °
Counterpart material S45C (carbon steel for machine structure) Chrome plating test cycle 30,000 cycles Lubrication None (dry lubrication)
In the journal rocking test under the test conditions, a friction coefficient of 0.08 and a wear amount of 40 μm were exhibited and excellent friction and wear characteristics were exhibited.

  As described above, the manufacturing method of the multi-layer sliding member of the present invention is made of a metal having a large thermal expansion coefficient on the inner surface of the pre-cylindrical laminated sliding face material inserted in the inner surface of the cylindrical back metal plate. The pipes are press-fitted and dried in a drying furnace at a temperature of 150 to 200 ° C. for 20 to 40 minutes, and then cooled in the step of cooling, due to the thermal expansion outward in the radial direction generated in the metal pipe, A high pressure is continuously applied to the inner surface of the back metal on the sliding surface material, and the sliding surface material is pressed against the inner surface of the cylindrical surface of the back metal. Since this manufacturing method does not require any large equipment, not only can the manufacturing cost be remarkably reduced, but also the surface of the sliding face material integrally joined to the cylindrical inner surface of the back metal. Since the dimensional accuracy can be ensured without requiring machining or the like, the product cost can be reduced. Further, in the obtained multi-layer sliding member 24, a sliding layer 23 serving as a sliding surface supported by the cylindrical inner surface 14 of the cylindrical back metal 13 made of a metal cylinder is formed of the laminated sliding surface material 16. In addition, since it is formed thick, it exhibits excellent friction and wear characteristics in high load applications and use under dry friction conditions.

  It can be used as a bearing manufacturing method. Especially suitable for small lot production. Furthermore, it is suitable for manufacturing bearings in a variety of small lot production.

It is explanatory drawing which shows the manufacturing apparatus of a sliding face material (resin processing base material). It is a perspective view which shows a sliding face material. It is a perspective view of the cylindrical back metal which consists of metal cylinders. It is a top view which shows the sliding face material cut | disconnected in the dimension corresponded to the expansion | deployment length of the cylindrical inner surface of a cylindrical back metal, and the height of a cylindrical back metal. It is sectional drawing which shows a lamination | stacking sliding face material. It is a perspective view which shows a preliminary | backup cylinder lamination | stacking sliding surface material. It is a perspective view which shows the manufacturing process of a multilayer sliding member. It is a perspective view which shows a multilayer sliding member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Uncoiler 2 Reinforcement base material 3,8 Feed roller 4 Thermosetting synthetic resin varnish 5 Container 6,7 Guide roller 9,10 Compression roll 11 Drying furnace 12 Sliding face material 13 Cylindrical backing metal 14 Cylindrical inner surface 15,20 Adhesive layer 16 Laminated sliding surface material 17 Butt end 18 Preliminary cylindrical laminated sliding surface material 19 Outer surface 21 Inner surface 22 Metal pipe 23 Sliding layer 24 Multi-layered sliding member

Claims (6)

A method for producing a multilayer sliding member comprising a cylindrical backing metal made of a metal cylinder and a sliding layer of a sliding face material integrally formed on the cylindrical inner surface of the cylindrical backing metal,
(A) an impregnation application step of impregnating and applying a thermosetting synthetic resin varnish containing tetrafluoroethylene resin powder to a woven fabric containing spun yarns of synthetic fibers;
(B) In the impregnation coating step, the resulting woven fabric is dried and consists of 25 to 35% by weight of tetrafluoroethylene resin, 25 to 50% by weight of thermosetting synthetic resin, and 25 to 50% by weight of woven fabric. A sliding face material production process for producing a sliding face material;
(C) The sliding face material obtained in the sliding face material manufacturing step is cut into dimensions corresponding to the developed length of the cylindrical inner surface of the cylindrical back metal and the height of the cylindrical back metal. A cutting and laminating step of laminating and laminating a plurality of sheets,
(D) a laminated sliding face material producing step of producing a laminated sliding face material by heating and pressure forming the laminated sliding face material obtained in the cutting and laminating step in the laminating direction;
(E) The laminated sliding face material obtained in the laminated sliding face material producing step is bent under heating, and the curvature of the laminated sliding face material matches the curvature of the cylindrical inner surface of the cylindrical backing metal. A pre-cylindrical laminated sliding face material forming step for forming into a pre-cylindrical laminated sliding face material having butt ends at both ends, and
(F) The cylindrical inner surface of the cylindrical back metal made of the metal cylinder and having an adhesive layer formed on the cylindrical outer surface of the preliminary cylindrical laminated sliding surface material obtained in the preliminary cylindrical laminated sliding surface material forming step Forming an adhesive layer on the adhesive layer;
(G) The cylindrical outer surface on which the adhesive is applied to the preliminary cylindrical laminated sliding face material obtained in the adhesive layer forming step is brought into contact with the adhesive layer formed on the cylindrical inner surface of the cylindrical backing metal to form the cylindrical shape. An insertion step of inserting into the cylindrical inner surface of the back metal;
(H) a metal pipe press-fitting step of press-fitting a metal pipe having a large thermal expansion coefficient into the inner surface of the preliminary cylindrical laminated sliding face material inserted into the cylindrical inner surface of the cylindrical backing metal;
(I) a drying step of drying the cylindrical back metal, the preliminary cylindrical laminated sliding surface material and the metallic pipe obtained in the metal pipe press-fitting step at a temperature of 150 to 200 ° C. for 20 to 40 minutes in a drying furnace; ,
(J) a cooling step of cooling the cylindrical backing metal obtained in the drying step, the preliminary cylindrical laminated sliding face material and the metal pipe, and removing the metallic pipe by contraction;
In the drying furnace, the pre-cylindrical laminated sliding face material is pressed against the cylindrical inner surface of the cylindrical backing metal by thermal expansion outward in the radial direction of the metal pipe, and the sliding layer made of the sliding face material is A method of manufacturing a multilayer sliding member, wherein the inner surface is integrally joined to a cylindrical inner surface of a back metal.   The method for manufacturing a multilayer sliding member according to claim 1, wherein the cylindrical backing metal is made of a steel pipe.   The multi-layer sliding member according to claim 1 or 2, wherein the woven fabric is formed from at least one spun yarn of synthetic fiber selected from polyester fiber, polyvinyl alcohol fiber and aramid fiber. Method.   The woven fabric is formed from a twisted yarn of a spun yarn of a synthetic fiber selected from a polyester fiber, a polyvinyl alcohol fiber, and an aramid fiber and a filament yarn or a spun yarn of an ethylene tetrafluoride resin fiber. Item 3. A method for producing a multilayer sliding member according to Item 1 or 2.   The woven fabric is a woven fabric selected from each of a plain weave, a twill weave, a satin weave, a change plain weave, a change twill weave, a change satin weave, a mixed structure of a mihara structure and a change structure. The manufacturing method of the multilayer sliding member as described in any one of Claims 1-4.   6. The thermosetting synthetic resin is one of synthetic resins selected from a resol type phenol resin, an epoxy resin, and an unsaturated polyester resin. The manufacturing method of the multilayer sliding member of description.

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