WO2017047724A1 - Method for manufacturing sliding member for fixing device - Google Patents

Method for manufacturing sliding member for fixing device Download PDF

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Publication number
WO2017047724A1
WO2017047724A1 PCT/JP2016/077346 JP2016077346W WO2017047724A1 WO 2017047724 A1 WO2017047724 A1 WO 2017047724A1 JP 2016077346 W JP2016077346 W JP 2016077346W WO 2017047724 A1 WO2017047724 A1 WO 2017047724A1
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WO
WIPO (PCT)
Prior art keywords
coating film
resin
sliding member
resin coating
fixing device
Prior art date
Application number
PCT/JP2016/077346
Other languages
French (fr)
Japanese (ja)
Inventor
和夫 廣瀬
洋志 柳川
芳英 姫野
Original Assignee
Ntn株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Priority to US15/761,108 priority Critical patent/US20180275571A1/en
Priority to CN201680053780.3A priority patent/CN108027580B/en
Priority claimed from JP2016180055A external-priority patent/JP6817680B2/en
Publication of WO2017047724A1 publication Critical patent/WO2017047724A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat

Definitions

  • the present invention relates to a method for manufacturing a sliding member for a fixing device, and more particularly, in a belt nip type fixing device, used for reducing sliding resistance caused by rotation of the belt between a belt and a pressing member.
  • the present invention relates to a method for manufacturing a sliding member.
  • the fixing device includes a configuration including a heating roller and a pressure belt disposed in contact with the heating roller, and a heating belt and a pressure roller disposed in contact with the heating belt.
  • a fixing device called a belt nip method such as a configuration described above.
  • the belt is arranged to be pressed against the other roller by a pressing member from the inner surface, and a sliding member is interposed between the belt and the pressing member for the purpose of reducing sliding resistance accompanying the rotation of the belt. I am letting.
  • lubricating oil or grease is applied and supplied as a lubricant to the inner peripheral surface of the belt.
  • Patent Document 1 discloses a lattice-shaped uneven shape by embossing using a metal mesh on a sliding sheet corresponding to the above-described sliding member, a polytetrafluoroethylene (hereinafter referred to as PTFE) resin layer, and a crosslinked PTFE resin. What is formed in the layer is described.
  • PTFE polytetrafluoroethylene
  • Japanese Patent Application Laid-Open No. H10-228561 describes a structure in which a plurality of recesses and grooves are provided on the sliding surfaces of these members in order to reduce the sliding frictional resistance between the fixing film and the film guide member.
  • Japanese Patent Application Laid-Open No. H10-228561 describes a concave portion for holding a lubricant on the inner surface of the heating roller.
  • Patent Document 4 describes that a surface of a sliding sheet corresponding to the above sliding member has a thick portion and a thin portion repeatedly.
  • the sliding surface of the base member of the pressing member on the inner surface of the belt was subjected to dimple recesses and grooves, and a resin film was formed on this surface to provide an oil reservoir.
  • a sliding member is known.
  • the sliding member with a grooved surface or dimple recessed hole on the surface that slides with the belt of the sliding member, and a resin film formed on this surface to provide an oil reservoir, the dimple diameter and groove width of the oil reservoir, etc.
  • the pressure receiving surface when pressed by the roller is reduced accordingly.
  • the resin film is worn away, resulting in a lubrication failure such as an increase in the coefficient of friction over time.
  • the resin does not enter the fine groove part. In some cases, it may be filled with resin. Further, even if an attempt is made to post-process minute concave grooves after film formation (after firing), the film is hard and cannot be transferred, and there is a risk that the film will break if a strong force is applied. Thus, it is not easy to obtain fine grooves on the surface of the resin film of the final sliding member.
  • the present invention has been made in order to cope with such problems.
  • a sliding member for a fixing device having a resin coating film on the sliding surface the fine surface serving as a lubricant holding portion on the surface of the resin coating film is provided. It is an object of the present invention to provide a method for manufacturing a peeling member for a fixing device capable of forming a concave groove or the like.
  • the method for manufacturing a sliding member for a fixing device includes a fixing member heated by a heating unit and rotated by a driving unit, a belt member rotating with the rotation of the fixing member, and the belt member on the fixing member side.
  • a fixing device having a pressing member for pressing and forming a nip portion with the fixing member via the belt member, a method for manufacturing a sliding member interposed between the belt member and the pressing member
  • a resin coating containing a matrix resin is applied to at least a sliding surface of the base of the sliding member that slides with the belt member, and then dried to form a resin coating film.
  • the matrix resin is a polyamide-imide (hereinafter referred to as PAI) resin.
  • the resin coating film is a resin coating film containing at least a fluorine resin powder and a graphite powder in a matrix resin, and the resin coating film contains 25 to 70 weights of the fluorine resin with respect to 100 parts by weight of the matrix resin. And 1 to 20 parts by weight of the above graphite.
  • the fluororesin is a PTFE resin
  • the graphite is graphite having 97.5% or more of fixed carbon.
  • the concave portion processed and formed in the concave portion forming step is a geometric pattern groove or a fluid dynamic pressure groove. Further, the geometric pattern groove is a unidirectional oblique pattern groove or iris pattern groove.
  • a resin coating containing a matrix resin is applied to at least a sliding surface of a sliding member base material that slides with a belt member, and then dried to form a resin coating film.
  • a recess forming step of forming a recess to be a lubricant holding portion after the process In other words, by sandwiching a recess forming step between the coating film forming step and the coating film baking step, a recess is easily formed on the resin coating in a soft state immediately after coating and drying, and this is baked and cured. Thus, it is possible to form a resin coating film having a lubricant holding portion composed of the concave portion. As a result, the surface of the sliding member is finer compared to the case where the concave portion is formed on the surface after the coating film is formed (after firing) or the case where the concave portion is formed on the substrate side surface before the resin coating film is formed. This makes it possible to form a precise recess.
  • the sliding member having a fine and precise lubricant holding part obtained by this manufacturing method has a reduced sliding area with the belt, and the lubricant reaches the entire sliding surface. Improvement can be suppressed.
  • the resin coating film is a resin coating film containing at least a fluororesin and graphite in a matrix resin, and the resin coating film comprises 25 to 70 parts by weight of a fluororesin and 100 parts by weight of a matrix resin. Since it contains 1 to 20 parts by weight, the resin coating film is excellent in low friction and wear resistance.
  • the concave portion processed and formed in the groove forming step is a geometric pattern groove or a fluid dynamic pressure groove, the sliding characteristics on the sliding surface are excellent.
  • FIG. 2 is a diagram illustrating an outline of a belt nip type fixing device. It is a figure which shows an example of the sliding member obtained with the manufacturing method of this invention. It is an enlarged photograph of the sliding member surface created in the experiment example.
  • the sliding member targeted by the method for manufacturing a sliding member for a fixing device of the present invention is used for a belt nip type fixing device in an electrophotographic apparatus.
  • the fixing device includes (1) a heating roller that is a fixing member and a pressure belt that is disposed in contact with the heating roller, and (2) a heating belt that is a fixing member, For example, there may be a configuration including a pressure roller disposed in contact therewith.
  • the belt is arranged to be pressed from the inner surface to the other roller by a pressing member.
  • the sliding member is a member interposed between the belt and the pressing member.
  • the fixing member is a heating belt, and can be applied to a belt-belt type in which this is combined with a pressure belt.
  • FIG. 2 is a schematic diagram of the fixing device having the configuration (1).
  • the fixing device 1 includes a heating roller 2 that is a fixing member, and a pressure belt 3 that is a belt member disposed in contact with the heating roller.
  • a heating means 2 a is built in the heating roller 2.
  • the pressure belt 3 is a hollow rotating body (endless belt). The heating roller 2 is driven by the driving means, and the pressure belt 3 follows this.
  • a pressing member 4 is disposed inside the pressure belt 3 and presses the pressure belt 3 toward the heating roller 2 side.
  • the fixing device 1 sandwiches a sheet 7 carrying an unfixed toner image at a nip portion 6 formed between a heating roller 2 and a pressure belt 3, and heats and presses to fix the toner image. ing.
  • a sliding member 5 is provided between the pressure belt 3 and the pressing member 4.
  • the sliding member 5 is fixed to the pressing member 4.
  • lubricating oil or grease is applied and supplied to the inner peripheral surface of the pressure belt 3 as a lubricant to lubricate between the sliding member 5 and the pressure belt 3.
  • the grease mainly used is a fluorine grease using a fluorinated oil as a base oil and a fluorine resin powder as a thickener.
  • FIG. 3 is a plan view of the sliding member.
  • the resin coating film 5b is formed in the surface of the base material 5a.
  • a lubricant holding portion 5c for iris pattern grooves is formed on the surface of the resin coating film 5b.
  • channel is formed in the surface of the resin coating film 5b.
  • the manufacturing method of the present invention is a method for manufacturing such a sliding member.
  • a method for manufacturing a sliding member for a fixing device according to the present invention will be described with reference to FIG.
  • FIG. 1 is a flowchart of this manufacturing method.
  • the coating film forming step, (2) the recess forming step, and (3) the coating film baking step are performed in this order.
  • the present invention is characterized in that a recess forming step is sandwiched between a coating film forming step and a coating film baking step (dotted line portion in the figure) that are normally performed continuously. Each step will be described below.
  • the base material of the sliding member is prepared.
  • the shape of the substrate is determined according to the specifications of the fixing device to be applied, the shape of the pressing member, and the like. For example, a flat plate shape, a sheet shape, or a shape having a curved surface or an arc shape on the sliding surface can be adopted.
  • the pressing member itself may be used as a base material of the sliding member, and a resin coating film may be formed on the sliding surface of the pressing member with the belt, without using a separate member from the pressing member.
  • a metal base material is mainly used.
  • the material for example, by adopting iron, aluminum, aluminum alloy, copper, copper alloy or the like, desired load resistance can be ensured.
  • iron include stainless steel (SUS304, SUS316, etc.), mild steel (SPCC, SPCE, etc.), general structural carbon steel (SS400, etc.), and the like. Further, these may be plated with zinc, nickel, copper or the like in advance.
  • aluminum include A1100 and A1050
  • examples of aluminum alloys include A2017 and A5052 (including anodized products)
  • examples of copper include C1100
  • examples of copper alloys include C2700 and C2801.
  • the surface of the resin coating on the metal substrate is roughened into a concavo-convex shape by shot blasting, tumbling, machining, etc., or subjected to a chemical surface treatment in order to improve adhesion to the resin coating.
  • a fine uneven shape may be formed.
  • Coating film forming step This step is a step of forming a resin coating film by applying a resin paint containing a matrix resin and then drying it.
  • the resin coating is obtained by dispersing or dissolving a matrix resin and other compounding agents that are solids in solvents.
  • any heat-resistant resin can be used as long as it is excellent in adhesiveness and has heat resistance that does not cause thermal deterioration when the sliding member is used.
  • PAI resin polyphenylene sulfide resin, polyether ether ketone resin, polyimide resin, polyamide resin, epoxy resin, phenol resin, and the like can be given.
  • PAI resin it is preferable to use a PAI resin because it is excellent in heat resistance, wear resistance, and adhesion to a substrate.
  • Solvents for dispersing these matrix resins include ketones such as acetone and methyl ethyl ketone, esters such as methyl acetate and ethyl acetate, aromatic hydrocarbons such as toluene and xylene, methyl chloroform, trichloroethylene, and trichlorotrifluoroethane.
  • Organic halogenated compounds such as N-methyl-2-pyrrolidone (NMP), methylisopyrrolidone (MIP), dimethylformamide (DMF), dimethylacetamide (DMAC) and other aprotic polar solvents can be illustrated. These solvents can be used alone or as a mixture. The kind of solvent and the liquid viscosity may be adjusted according to the application method of the resin paint.
  • the method of applying the resin paint to the substrate surface is not particularly limited, but for example, a method such as spray coating can be adopted.
  • the resin paint may be applied to at least a sliding surface of the substrate that slides with the belt member.
  • the drying in this step is performed to such an extent that a recess can be formed in the next recess formation step.
  • the resin coating film has fluidity, and even if the concave shape is formed by transfer or the like, the paint flows and is crushed. Even if a part of the solvent remains in the resin coating film, it may be dried until the fluidity is such that the grooves are not crushed when the recesses are formed.
  • the ratio of the solid component in the resin coating film is 70% by weight or more. This can be easily managed by measuring the product weight before painting, immediately after painting and after drying.
  • the film thickness of the resin coating film after drying can be formed to a desired film thickness.
  • the thickness of the resin coating film after drying may be formed to 20 to 50 ⁇ m.
  • (2) Concave formation process It is a process of processing and forming the concave part used as a lubricant holding part after the coating film baking process on the surface of this resin coating film.
  • the resin coating film obtained in the previous resin coating film forming step has a low hardness and a soft state as compared with the resin coating film after firing. This process is carried out immediately after the resin coating film forming process using this.
  • the concave portion formed in this step becomes a lubricant holding portion on the surface of the resin coating film in the final sliding member through the firing of the next step.
  • the shape of the concave portion and the final lubricant holding portion are substantially the same.
  • the shape of the recess is not particularly limited, and can be any shape such as a dimple recess or a recess. Moreover, the depth of this recessed part may reach the base material surface.
  • the concave groove may be, for example, a geometric pattern groove such as a unidirectional oblique pattern groove or an iris pattern groove, or a fluid dynamic pressure groove such as a herringbone groove or a spiral groove. These concave grooves are preferably formed in a direction perpendicular to the sliding direction.
  • the one-way diagonal pattern groove (FIG. 3B) and the iris pattern groove (FIG. 3A) are inclined in one direction or two directions (iris) with respect to the paper passing direction. And each is comprised from the streak-like groove
  • such a groove can be formed by, for example, pressing a knurling piece while rotating it on the surface of the resin coating film.
  • a fine concave shape that cannot be formed when a concave portion is formed on the surface after coating film formation (after firing) or when a concave portion is formed on the substrate surface before resin coating film formation is formed. Is preferred.
  • the unidirectional oblique pattern groove or iris pattern groove a pattern having a groove width of 30 to 500 ⁇ m (preferably 30 to 100 ⁇ m) and a pitch of 0.4 to 1.5 mm (preferably 0.5 to 1.0 mm). A groove is preferable.
  • Fluid dynamic pressure groove shapes such as herringbone grooves and spiral grooves can be formed by pressing a transfer member corresponding to each shape.
  • the groove width is preferably about 100 ⁇ m.
  • the concave portion is a dimple concave hole
  • the number of the concaves having a diameter of 1.5 mm or less is 25 or more per 1 cm 2 in order to achieve miniaturization for the same reason as the iris pattern groove. More preferably, there are 50 or more recesses having a diameter of 1.0 mm or less per 1 cm 2 .
  • Coating film baking process This process is a process of baking and curing the resin coating film in which the recesses are formed in the previous recess forming process. Baking is performed for a predetermined time at a baking temperature corresponding to the matrix resin. Through this firing step, the resin coating film is baked and hardened to obtain a strong resin coating film having a lubricant holding portion having a predetermined shape.
  • the thickness of the resin coating on this sliding member is about 10 ⁇ m to 30 ⁇ m.
  • the sliding member having the lubricant holding portion obtained by this manufacturing method can reduce the direct sliding area with the belt due to the fineness of the holding portion. Furthermore, since the holding part is precisely formed without crushing the groove, the lubricant can easily reach the entire sliding surface, the friction can be reduced over the entire sliding surface, and the improvement of the friction coefficient over time can be suppressed. .
  • the resin coating film of this sliding member in order to further improve the friction and wear characteristics and the like, it is preferable to blend at least a fluororesin powder and a graphite powder as a compounding agent in the above matrix resin.
  • Fluorine resin can be used as long as it can impart low friction and non-adhesiveness to the resin coating film and has heat resistance.
  • fluororesin include PTFE resin, tetrafluoroethylene-perfluoroalkyl vinyl ether (PFA) copolymer resin, tetrafluoroethylene-hexafluoropropylene (FEP) copolymer resin, and tetrafluoroethylene-ethylene (ETFE) copolymer.
  • PFA tetrafluoroethylene-perfluoroalkyl vinyl ether
  • FEP tetrafluoroethylene-hexafluoropropylene copolymer resin
  • ETFE tetrafluoroethylene-ethylene copolymer.
  • Polymer resin etc. are mentioned. Among these, it is preferable to use PTFE resin powder.
  • its average particle diameter is not particularly limited, but is preferably 30 ⁇ m or less in order to maintain the surface smoothness of the resin coating film.
  • PTFE resin powder a PTFE resin obtained by heating and baking at a melting point or higher can be used. Further, a powder obtained by further irradiating a heat-fired powder with ⁇ rays or electron beams can also be used. These PTFE resin powders are superior in uniform dispersibility in a resin coating and superior in wear resistance of the formed resin coating film, compared to PTFE resins (molding powder, fine powder) that are not heated and fired. .
  • Fluorine resin such as PTFE resin is preferably blended in an amount of 25 to 70 parts by weight based on 100 parts by weight of the matrix resin in the resin coating.
  • the blending amount of the fluororesin is less than 25 parts by weight, the low friction property is deteriorated, and there is a risk that accelerated wear due to heat generation occurs.
  • the blending amount of the fluororesin exceeds 70 parts by weight, the low friction property is excellent, but the coating film strength and wear resistance may be deteriorated.
  • graphite has excellent properties as a solid lubricant.
  • Graphite is roughly classified into natural graphite and artificial graphite, and any of them can be used.
  • the shape includes flakes, granules, and spheres, but any of them can be used.
  • graphite it is preferable to use graphite having 97.5% or more of fixed carbon, and artificial graphite having 98.5% or more of fixed carbon is more preferable.
  • Such graphite has high compatibility with the lubricating oil, and even if the lubricating oil does not adhere to a part of the surface, the lubricating property is maintained by the lubricating oil impregnated in a trace amount in the graphite.
  • the graphite is preferably blended in an amount of 1 to 20 parts by weight with respect to 100 parts by weight of the matrix resin in the resin coating.
  • the blending amount of graphite is less than 1 part by weight, a sufficient effect cannot be obtained when graphite is blended.
  • the blending amount of graphite exceeds 20 parts by weight, the adhesiveness of the resin coating film is impaired, which may cause peeling.
  • the resin coating film may contain other additives in addition to the matrix resin, fluororesin, and graphite as long as the required characteristics of the sliding member of the present invention are not significantly reduced. If the total amount of additives such as fluororesin and graphite relative to the matrix resin is less than 15 parts by weight, unevenness occurs in the resin coating film, making it difficult to obtain the required dimensional accuracy.
  • the tensile shear adhesive strength of the resin coating film is 25 MPa or more. In this case, even if the contact strength between the base material of the sliding member and the resin coating film is high and the contact surface pressure with the belt is high, it can be used stably. If the PAI resin is used as the matrix resin and the resin coating film includes the fluororesin powder and the graphite powder in the above-described preferred blending range, a tensile shear bond strength of 25 MPa or more can be achieved.
  • FIG. 4 shows a photograph of the surface of the resin coating film of the obtained sliding member. In this photograph, the pitch of the iris pattern groove as the lubricant holding portion was 0.7 mm, and the groove width was 100 ⁇ m.
  • the solid content of the resin paint is as follows.
  • a PAI resin varnish in which a PAI resin was dispersed in N-methylpyrrolidone was used, and this was mixed with a PTFE resin and graphite powder and diluted. 45 parts by weight of PTFE resin was added to 100 parts by weight of PAI resin, and 10 parts by weight of graphite powder was added to 100 parts by weight of PAI resin.
  • PTFE PTFE resin (average particle size 10 ⁇ m, heat-fired material)
  • PAI Glass transition temperature 245 ° C.
  • Graphite powder Artificial graphite (average particle size 10 ⁇ m)
  • a fine and precise lubricant holding portion can be formed on the surface of the resin coating film of the sliding member.
  • the manufacturing method of the sliding member for a fixing device according to the present invention includes a sliding member for a fixing device having a resin coating film on the sliding surface. Since it can be formed, it is suitable as a manufacturing method of a sliding member used in a belt nip type fixing device.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sliding-Contact Bearings (AREA)
  • Fixing For Electrophotography (AREA)

Abstract

Provided is a method for manufacturing a sliding member for a fixing device, said sliding member having a resin coating film on a sliding surface, wherein the method makes it possible to form a fine recessed groove, which serves as a lubricant holding part, in the surface of the resin coating film. This method for manufacturing a sliding member for a fixing device includes: a coating film forming step, in which a resin coating material containing a matrix resin is applied to a sliding surface, which slides with at least a belt member of a backing of the sliding member, and then the resin coating material is dried, thereby forming a resin coating film; a coating film baking step, in which the resin coating film is baked and hardened; and, after the coating film forming step and before the coating film baking step, a crevice forming step, in which a crevice, which serves as a lubricant holding part after the coating film baking step, is formed in the surface of the resin coating film.

Description

定着装置用摺動部材の製造方法Manufacturing method of sliding member for fixing device
　本発明は定着装置用の摺動部材の製造方法に関し、詳細には、ベルトニップ方式の定着装置において、ベルトと押圧部材との間で該ベルトの回転に伴う摺動抵抗を低減するために使用される摺動部材の製造方法に関する。 The present invention relates to a method for manufacturing a sliding member for a fixing device, and more particularly, in a belt nip type fixing device, used for reducing sliding resistance caused by rotation of the belt between a belt and a pressing member. The present invention relates to a method for manufacturing a sliding member.
　複写機やレーザービームプリンタなどの電子写真装置では、用紙に形成された未定着トナー像を定着装置によって定着して画像形成している。この定着装置としては、加熱ローラと、この加熱ローラに接触して配置された加圧ベルトとを備えた構成や、加熱ベルトと、この加熱ベルトに接触して配置された加圧ローラとを備えた構成などのベルトニップ方式と呼ばれる定着装置が知られている。これら定着装置では、ベルトは内面から押圧部材により他方のローラに押圧されて配置され、当該ベルトと押圧部材の間には、ベルトの回転に伴う摺動抵抗を低減する目的で摺動部材を介在させている。また、ベルトの内周面と摺動部材の摺動面との摩擦をより低減するため、ベルトの内周面には潤滑剤として潤滑油やグリースが塗布・供給されている。 In an electrophotographic apparatus such as a copying machine or a laser beam printer, an unfixed toner image formed on a sheet is fixed by a fixing device to form an image. The fixing device includes a configuration including a heating roller and a pressure belt disposed in contact with the heating roller, and a heating belt and a pressure roller disposed in contact with the heating belt. There is known a fixing device called a belt nip method such as a configuration described above. In these fixing devices, the belt is arranged to be pressed against the other roller by a pressing member from the inner surface, and a sliding member is interposed between the belt and the pressing member for the purpose of reducing sliding resistance accompanying the rotation of the belt. I am letting. Further, in order to further reduce the friction between the inner peripheral surface of the belt and the sliding surface of the sliding member, lubricating oil or grease is applied and supplied as a lubricant to the inner peripheral surface of the belt.
　この摺動部材としては、特許文献１～特許文献４のようなものが知られている。特許文献１には、上記の摺動部材に相当する摺動シートに金属メッシュを用いたエンボス加工で格子状の凹凸形状を、ポリテトラフルオロエチレン（以下、ＰＴＦＥと記す）樹脂層や架橋ＰＴＦＥ樹脂層に形成したものが記載されている。特許文献２には、定着フィルムとフィルムガイド部材との摺動摩擦抵抗を低減するために、これらの部材の摺動面に複数の凹部や溝を設けたものが記載されている。特許文献３には、加熱ローラ内面に潤滑剤を保持する凹部を設けたものが記載されている。特許文献４には、上記の摺動部材に相当する摺動シートの表面に、厚い部分と薄い部分を繰り返し有するものが記載されている。 As this sliding member, those described in Patent Documents 1 to 4 are known. Patent Document 1 discloses a lattice-shaped uneven shape by embossing using a metal mesh on a sliding sheet corresponding to the above-described sliding member, a polytetrafluoroethylene (hereinafter referred to as PTFE) resin layer, and a crosslinked PTFE resin. What is formed in the layer is described. Japanese Patent Application Laid-Open No. H10-228561 describes a structure in which a plurality of recesses and grooves are provided on the sliding surfaces of these members in order to reduce the sliding frictional resistance between the fixing film and the film guide member. Japanese Patent Application Laid-Open No. H10-228561 describes a concave portion for holding a lubricant on the inner surface of the heating roller. Patent Document 4 describes that a surface of a sliding sheet corresponding to the above sliding member has a thick portion and a thin portion repeatedly.
　また、摺動特性をより改善するために、ベルトの内面にある押圧部材の基材の摺動面にディンプル凹穴や溝加工を施し、この面に樹脂被膜を形成して油溜りを設けた摺動部材が知られている。 In addition, in order to further improve the sliding characteristics, the sliding surface of the base member of the pressing member on the inner surface of the belt was subjected to dimple recesses and grooves, and a resin film was formed on this surface to provide an oil reservoir. A sliding member is known.
特開２００５－３９６９号公報Japanese Patent Laid-Open No. 2005-3969 特開２００１－４２６７０号公報JP 2001-42670 A 特開２００２－２５７５９号公報JP 2002-25759 A 特開２００９－１５２２７号公報JP 2009-15227 A
　摺動部材のベルトと摺動する面に凹溝加工やディンプル凹穴などを施し、この面に樹脂被膜を形成して油溜りを設けた摺動部材は、油溜りのディンプル径や溝幅などが大きくなり、その分、ローラに押圧される際の受圧面が減少する。これにより、樹脂被膜が摩耗するなどして、摩擦係数が経時的に増加するなど潤滑不具合が生じていた。継続使用しても摩擦係数の向上を抑制できるようにするためには、樹脂被膜表面に微細で精密な油溜り（凹溝など）を形成することが望ましい。 The sliding member with a grooved surface or dimple recessed hole on the surface that slides with the belt of the sliding member, and a resin film formed on this surface to provide an oil reservoir, the dimple diameter and groove width of the oil reservoir, etc. The pressure receiving surface when pressed by the roller is reduced accordingly. As a result, the resin film is worn away, resulting in a lubrication failure such as an increase in the coefficient of friction over time. In order to suppress the improvement of the coefficient of friction even if it is continuously used, it is desirable to form a fine and precise oil sump (such as a groove) on the surface of the resin film.
　摺動部の表面に微細な油溜りを設けるため、押圧部材の基材の摺動面に微細な凹溝を加工後に樹脂塗料を用いて樹脂被膜を形成すると、微細な溝部に樹脂が入り込まない場合や、樹脂で埋まってしまう場合がある。また、被膜形成後（焼成後）に微細な凹溝を後加工しようとしても、被膜が硬質であり、転写形成できず、強い力をかけると被膜が割れる等のおそれがある。このように、最終的な摺動部材の樹脂被膜表面において微細な凹溝を得ることは容易ではない。 In order to provide a fine oil reservoir on the surface of the sliding part, if a resin coating is formed using a resin coating after processing a fine groove on the sliding surface of the base material of the pressing member, the resin does not enter the fine groove part. In some cases, it may be filled with resin. Further, even if an attempt is made to post-process minute concave grooves after film formation (after firing), the film is hard and cannot be transferred, and there is a risk that the film will break if a strong force is applied. Thus, it is not easy to obtain fine grooves on the surface of the resin film of the final sliding member.
　本発明はこのような問題に対処するためになされたものであり、摺動面に樹脂塗膜を有する定着装置用摺動部材において、この樹脂塗膜の表面に潤滑剤保持部となる微細な凹溝などを形成できる定着装置用剥離部材の製造方法を提供することを目的とする。 The present invention has been made in order to cope with such problems. In a sliding member for a fixing device having a resin coating film on the sliding surface, the fine surface serving as a lubricant holding portion on the surface of the resin coating film is provided. It is an object of the present invention to provide a method for manufacturing a peeling member for a fixing device capable of forming a concave groove or the like.
　本発明の定着装置用摺動部材の製造方法は、加熱手段により加熱され、駆動手段により回転する定着部材と、上記定着部材の回転とともに回転するベルト部材と、該ベルト部材を上記定着部材側に押圧する押圧部材とを有し、上記ベルト部材を介して上記定着部材との間でニップ部を形成する定着装置において、上記ベルト部材と上記押圧部材との間に介在させる摺動部材の製造方法であって、該製造方法は、上記摺動部材の基材の少なくとも上記ベルト部材と摺動する摺動面に、マトリックス樹脂を含む樹脂塗料を塗布した後に乾燥させて樹脂塗膜を形成する塗膜形成工程と、この樹脂塗膜を焼成して硬化させる塗膜焼成工程とを備え、上記塗膜形成工程の後、上記塗膜焼成工程の前に、上記樹脂塗膜の表面に、上記塗膜焼成工程後に潤滑剤保持部となる凹部を加工形成する凹部形成工程を有することを特徴とする。 The method for manufacturing a sliding member for a fixing device according to the present invention includes a fixing member heated by a heating unit and rotated by a driving unit, a belt member rotating with the rotation of the fixing member, and the belt member on the fixing member side. In a fixing device having a pressing member for pressing and forming a nip portion with the fixing member via the belt member, a method for manufacturing a sliding member interposed between the belt member and the pressing member In the manufacturing method, a resin coating containing a matrix resin is applied to at least a sliding surface of the base of the sliding member that slides with the belt member, and then dried to form a resin coating film. A film forming process and a coating film baking process for baking and curing the resin coating film, and after the coating film forming process and before the coating film baking process, on the surface of the resin coating film After film firing process Characterized in that it has a concave portion forming step of forming machining a recess serving as agent holding portion.
　上記マトリックス樹脂が、ポリアミドイミド（以下、ＰＡＩと記す）樹脂であることを特徴とする。また、上記樹脂塗膜は、マトリックス樹脂に少なくともフッ素樹脂粉末と黒鉛粉末とを含む樹脂塗膜であり、該樹脂塗膜は、上記マトリックス樹脂１００重量部に対して上記フッ素樹脂を２５～７０重量部、上記黒鉛を１～２０重量部含むことを特徴とする。また、上記フッ素樹脂がＰＴＦＥ樹脂であり、上記黒鉛が固定炭素９７．５％以上の黒鉛であることを特徴とする。 The matrix resin is a polyamide-imide (hereinafter referred to as PAI) resin. Further, the resin coating film is a resin coating film containing at least a fluorine resin powder and a graphite powder in a matrix resin, and the resin coating film contains 25 to 70 weights of the fluorine resin with respect to 100 parts by weight of the matrix resin. And 1 to 20 parts by weight of the above graphite. The fluororesin is a PTFE resin, and the graphite is graphite having 97.5% or more of fixed carbon.
　上記凹部形成工程で加工形成する上記凹部が、幾何学模様溝または流体動圧溝であることを特徴とする。また、上記幾何学模様溝が、一方向斜め模様溝またはアヤメ模様溝であることを特徴とする。 The concave portion processed and formed in the concave portion forming step is a geometric pattern groove or a fluid dynamic pressure groove. Further, the geometric pattern groove is a unidirectional oblique pattern groove or iris pattern groove.
　本発明の定着装置用摺動部材の製造方法は、摺動部材の基材の少なくともベルト部材と摺動する摺動面に、マトリックス樹脂を含む樹脂塗料を塗布した後に乾燥させて樹脂塗膜を形成する塗膜形成工程と、この樹脂塗膜を焼成して硬化させる塗膜焼成工程とを備え、塗膜形成工程と塗膜焼成工程との間に、樹脂塗膜の表面に、塗膜焼成工程後に潤滑剤保持部となる凹部を加工形成する凹部形成工程を有する。すなわち、塗膜形成工程と塗膜焼成工程との間に、凹部形成工程を挟むことで、塗布乾燥直後の柔らかい状態の樹脂塗膜に転写などにより凹部を容易に形成し、これを焼成硬化して、該凹部からなる潤滑剤保持部を有する樹脂塗膜を形成できる。これにより、塗膜形成後（焼成後）にその表面に凹部を形成する場合や、樹脂塗膜形成前に基材側表面に凹部を形成する場合と比較して、摺動部材の表面により微細で精密な凹部の形成が可能になる。 According to the method for manufacturing a sliding member for a fixing device of the present invention, a resin coating containing a matrix resin is applied to at least a sliding surface of a sliding member base material that slides with a belt member, and then dried to form a resin coating film. A coating film forming process to be formed and a coating film baking process for baking and curing the resin coating film. Between the coating film forming process and the coating film baking process, the surface of the resin coating film is baked. A recess forming step of forming a recess to be a lubricant holding portion after the process; In other words, by sandwiching a recess forming step between the coating film forming step and the coating film baking step, a recess is easily formed on the resin coating in a soft state immediately after coating and drying, and this is baked and cured. Thus, it is possible to form a resin coating film having a lubricant holding portion composed of the concave portion. As a result, the surface of the sliding member is finer compared to the case where the concave portion is formed on the surface after the coating film is formed (after firing) or the case where the concave portion is formed on the substrate side surface before the resin coating film is formed. This makes it possible to form a precise recess.
　この製造方法で得られる微細で精密な潤滑剤保持部を有する摺動部材は、ベルトとの直接摺動面積が減り、潤滑剤が摺動面全体に行き届くので、継続使用しても摩擦係数の向上を抑制できる。 The sliding member having a fine and precise lubricant holding part obtained by this manufacturing method has a reduced sliding area with the belt, and the lubricant reaches the entire sliding surface. Improvement can be suppressed.
　また、マトリックス樹脂が、ＰＡＩ樹脂であるので、耐熱性、耐摩耗性および摺動部材の基材との密着性に優れる。また、上記樹脂塗膜が、マトリックス樹脂に少なくともフッ素樹脂と黒鉛とを含む樹脂塗膜であり、該樹脂塗膜は、マトリックス樹脂１００重量部に対してフッ素樹脂を２５～７０重量部、黒鉛を１～２０重量部含むので、樹脂塗膜の低摩擦性と耐摩耗性に優れる。 Moreover, since the matrix resin is a PAI resin, it is excellent in heat resistance, wear resistance and adhesion of the sliding member to the base material. The resin coating film is a resin coating film containing at least a fluororesin and graphite in a matrix resin, and the resin coating film comprises 25 to 70 parts by weight of a fluororesin and 100 parts by weight of a matrix resin. Since it contains 1 to 20 parts by weight, the resin coating film is excellent in low friction and wear resistance.
　上記溝形成工程で加工形成する上記凹部が、幾何学模様溝または流体動圧溝であるので、摺動面での摺動特性に優れる。 Since the concave portion processed and formed in the groove forming step is a geometric pattern groove or a fluid dynamic pressure groove, the sliding characteristics on the sliding surface are excellent.
本発明の製造方法の製造工程フローを示す図である。It is a figure which shows the manufacturing process flow of the manufacturing method of this invention. ベルトニップ方式の定着装置の概要を示す図である。FIG. 2 is a diagram illustrating an outline of a belt nip type fixing device. 本発明の製造方法で得られた摺動部材の一例を示す図である。It is a figure which shows an example of the sliding member obtained with the manufacturing method of this invention. 実験例で作成した摺動部材表面の拡大写真である。It is an enlarged photograph of the sliding member surface created in the experiment example.
　本発明の定着装置用摺動部材の製造方法が対象とする摺動部材は、電子写真装置におけるベルトニップ方式の定着装置に用いるものである。この定着装置は、（１）定着部材である加熱ローラと、この加熱ローラに接触して配置される加圧ベルトとを備えた構成、（２）定着部材である加熱ベルトと、この加熱ベルトに接触して配置された加圧ローラとを備えた構成、などがある。これら定着装置では、ベルトは内面から押圧部材により他方のローラに押圧されて配置されている。上記摺動部材は、ベルトと押圧部材との間に介在する部材である。また、定着部材が加熱ベルトであり、これと加圧ベルトを組み合わせた、ベルト－ベルト形式にも適用できる。 The sliding member targeted by the method for manufacturing a sliding member for a fixing device of the present invention is used for a belt nip type fixing device in an electrophotographic apparatus. The fixing device includes (1) a heating roller that is a fixing member and a pressure belt that is disposed in contact with the heating roller, and (2) a heating belt that is a fixing member, For example, there may be a configuration including a pressure roller disposed in contact therewith. In these fixing devices, the belt is arranged to be pressed from the inner surface to the other roller by a pressing member. The sliding member is a member interposed between the belt and the pressing member. Further, the fixing member is a heating belt, and can be applied to a belt-belt type in which this is combined with a pressure belt.
　定着装置の一例を図２に基づき具体的に説明する。図２は、上記（１）の構成の定着装置の概要図である。定着装置１は、定着部材である加熱ローラ２と、この加熱ローラに接触して配置されるベルト部材である加圧ベルト３とを備えている。加熱ローラ２の内部には、加熱手段２ａが内蔵されている。加圧ベルト３は、中空回転体（エンドレスベルト）である。加熱ローラ２が駆動手段により駆動され、加圧ベルト３はこれに従動する。加圧ベルト３の内部には、押圧部材４が配置され、加圧ベルト３を加熱ローラ２側に向けて押圧している。定着装置１は、加熱ローラ２と加圧ベルト３との間に形成されるニップ部６で、未定着のトナー像を担持した用紙７を挟持し、加熱・加圧してこのトナー像を定着させている。定着装置１において、加圧ベルト３と押圧部材４との間に、摺動部材５が設けられている。摺動部材５は、押圧部材４に固定されている。なお、加圧ベルト３の内周面には潤滑剤として潤滑油やグリースが塗布・供給され、摺動部材５と加圧ベルト３との間を潤滑している。グリースとして、主に、フッ素化油を基油としフッ素樹脂粉末を増ちょう剤とするフッ素グリースが使用される。 An example of the fixing device will be specifically described with reference to FIG. FIG. 2 is a schematic diagram of the fixing device having the configuration (1). The fixing device 1 includes a heating roller 2 that is a fixing member, and a pressure belt 3 that is a belt member disposed in contact with the heating roller. A heating means 2 a is built in the heating roller 2. The pressure belt 3 is a hollow rotating body (endless belt). The heating roller 2 is driven by the driving means, and the pressure belt 3 follows this. A pressing member 4 is disposed inside the pressure belt 3 and presses the pressure belt 3 toward the heating roller 2 side. The fixing device 1 sandwiches a sheet 7 carrying an unfixed toner image at a nip portion 6 formed between a heating roller 2 and a pressure belt 3, and heats and presses to fix the toner image. ing. In the fixing device 1, a sliding member 5 is provided between the pressure belt 3 and the pressing member 4. The sliding member 5 is fixed to the pressing member 4. Note that lubricating oil or grease is applied and supplied to the inner peripheral surface of the pressure belt 3 as a lubricant to lubricate between the sliding member 5 and the pressure belt 3. As the grease, mainly used is a fluorine grease using a fluorinated oil as a base oil and a fluorine resin powder as a thickener.
　本発明の製造方法で得られる摺動部材の一例を図３に示す。図３は、この摺動部材の平面図である。図３（ａ）の摺動部材５は、基材５ａの表面に樹脂塗膜５ｂが形成されている。この樹脂塗膜５ｂの表面に、アヤメ模様溝の潤滑剤保持部５ｃが形成されている。また、図３（ｂ）の摺動部材５では、樹脂塗膜５ｂの表面に、一方向斜め模様溝の潤滑剤保持部５ｄが形成されている。微細な潤滑剤保持部を形成することで、ローラに押圧される際の受圧面の減少を抑制でき、樹脂塗膜５ｂの摩耗を防止できる。 An example of the sliding member obtained by the manufacturing method of the present invention is shown in FIG. FIG. 3 is a plan view of the sliding member. As for the sliding member 5 of Fig.3 (a), the resin coating film 5b is formed in the surface of the base material 5a. On the surface of the resin coating film 5b, a lubricant holding portion 5c for iris pattern grooves is formed. Moreover, in the sliding member 5 of FIG.3 (b), the lubricant holding | maintenance part 5d of a one-way diagonal pattern groove | channel is formed in the surface of the resin coating film 5b. By forming the fine lubricant holding portion, it is possible to suppress a decrease in the pressure receiving surface when pressed by the roller, and it is possible to prevent wear of the resin coating film 5b.
　本発明の製造方法は、このような摺動部材を製造するための方法である。本発明の定着装置用摺動部材の製造方法を図１に基づき説明する。図１は、この製造方法のフロー図である。本発明の製造方法は、摺動部材の基材を準備した後、（１）塗膜形成工程と（２）凹部形成工程と（３）塗膜焼成工程とを、この順で実施している。特に、通常は連続して行なう塗膜形成工程と塗膜焼成工程（図中点線部分）の間に凹部形成工程を挟んでいることに特徴を有する。各工程を以下に説明する。 The manufacturing method of the present invention is a method for manufacturing such a sliding member. A method for manufacturing a sliding member for a fixing device according to the present invention will be described with reference to FIG. FIG. 1 is a flowchart of this manufacturing method. In the manufacturing method of the present invention, after preparing the base material of the sliding member, (1) the coating film forming step, (2) the recess forming step, and (3) the coating film baking step are performed in this order. . In particular, the present invention is characterized in that a recess forming step is sandwiched between a coating film forming step and a coating film baking step (dotted line portion in the figure) that are normally performed continuously. Each step will be described below.
　まず、摺動部材の基材を準備する。該基材の形状は、適用する定着装置の仕様や押圧部材の形状などに応じて決定され、例えば、平板状、シート状、摺動面が曲面や弧状である形状などが採用できる。また、押圧部材と別部材とせずに、押圧部材自体を、この摺動部材の基材とし、押圧部材のベルトとの摺動面に、樹脂塗膜を形成してもよい。 First, the base material of the sliding member is prepared. The shape of the substrate is determined according to the specifications of the fixing device to be applied, the shape of the pressing member, and the like. For example, a flat plate shape, a sheet shape, or a shape having a curved surface or an arc shape on the sliding surface can be adopted. In addition, the pressing member itself may be used as a base material of the sliding member, and a resin coating film may be formed on the sliding surface of the pressing member with the belt, without using a separate member from the pressing member.
　基材は、樹脂塗膜の焼成時の温度に耐え得る必要があることから、主に金属製基材が採用される。材質としては、例えば、鉄、アルミニウム、アルミニウム合金、銅、銅合金などを採用することで、所望の耐荷重性などを確保できる。鉄としてはステンレス鋼（ＳＵＳ３０４、ＳＵＳ３１６など）、軟鋼（ＳＰＣＣ、ＳＰＣＥなど）、一般構造用炭素鋼（ＳＳ４００など）などが挙げられる。また、これらに亜鉛、ニッケル、銅などのめっきを予め施してもよい。アルミニウムとしてはＡ１１００、Ａ１０５０、アルミニウム合金としてはＡ２０１７、Ａ５０５２（アルマイト処理品も含む）、銅としてはＣ１１００、銅合金としてはＣ２７００、Ｃ２８０１などがそれぞれ挙げられる。 Since the base material must be able to withstand the temperature during firing of the resin coating film, a metal base material is mainly used. As the material, for example, by adopting iron, aluminum, aluminum alloy, copper, copper alloy or the like, desired load resistance can be ensured. Examples of iron include stainless steel (SUS304, SUS316, etc.), mild steel (SPCC, SPCE, etc.), general structural carbon steel (SS400, etc.), and the like. Further, these may be plated with zinc, nickel, copper or the like in advance. Examples of aluminum include A1100 and A1050, examples of aluminum alloys include A2017 and A5052 (including anodized products), examples of copper include C1100, and examples of copper alloys include C2700 and C2801.
　また、金属製の基材の樹脂塗膜の形成面は、樹脂塗膜との密着性を向上させるために、ショットブラスト、タンブラー、機械加工などにより凹凸形状に荒らす、または、化学表面処理を施して微細凹凸形状を形成してもよい。 In addition, the surface of the resin coating on the metal substrate is roughened into a concavo-convex shape by shot blasting, tumbling, machining, etc., or subjected to a chemical surface treatment in order to improve adhesion to the resin coating. A fine uneven shape may be formed.
（１）塗膜形成工程
　この工程は、マトリックス樹脂を含む樹脂塗料を塗布した後に乾燥させて樹脂塗膜を形成する工程である。樹脂塗料は、固形分となるマトリックス樹脂と他の配合剤を、溶剤類に分散または溶解させることにより得られる。 (1) Coating film forming step This step is a step of forming a resin coating film by applying a resin paint containing a matrix resin and then drying it. The resin coating is obtained by dispersing or dissolving a matrix resin and other compounding agents that are solids in solvents.
　マトリックス樹脂としては、密着性に優れるとともに、摺動部材の使用時に熱劣化することのない耐熱性を有する耐熱性樹脂であれば使用できる。具体的には、ＰＡＩ樹脂、ポリフェニレンサルファイド樹脂、ポリエーテルエーテルケトン樹脂、ポリイミド樹脂、ポリアミド樹脂、エポキシ樹脂、フェノール樹脂などが挙げられる。これらの中でも、耐熱性、耐摩耗性、および、基材との密着性に優れることから、ＰＡＩ樹脂を用いることが好ましい。 As the matrix resin, any heat-resistant resin can be used as long as it is excellent in adhesiveness and has heat resistance that does not cause thermal deterioration when the sliding member is used. Specifically, PAI resin, polyphenylene sulfide resin, polyether ether ketone resin, polyimide resin, polyamide resin, epoxy resin, phenol resin, and the like can be given. Among these, it is preferable to use a PAI resin because it is excellent in heat resistance, wear resistance, and adhesion to a substrate.
　これらマトリックス樹脂などを分散する溶剤類としては、アセトン、メチルエチルケトンなどのケトン類、酢酸メチル、酢酸エチルなどのエステル類、トルエン、キシレンなどの芳香族炭化水素類、メチルクロロホルム、トリクロロエチレン、トリクロロトリフルオロエタンなどの有機ハロゲン化化合物類、Ｎ－メチル－２－ピロリドン（ＮＭＰ）、メチルイソピロリドン（ＭＩＰ）、ジメチルホルムアミド（ＤＭＦ）、ジメチルアセトアミド（ＤＭＡＣ）などの非プロトン系極性溶剤類などを使用することが例示できる。これらの溶剤類は、単独または混合物として使用することができる。樹脂塗料の塗布方法にあわせ、溶剤の種類、液粘度を調整すればよい。 Solvents for dispersing these matrix resins include ketones such as acetone and methyl ethyl ketone, esters such as methyl acetate and ethyl acetate, aromatic hydrocarbons such as toluene and xylene, methyl chloroform, trichloroethylene, and trichlorotrifluoroethane. Organic halogenated compounds such as N-methyl-2-pyrrolidone (NMP), methylisopyrrolidone (MIP), dimethylformamide (DMF), dimethylacetamide (DMAC) and other aprotic polar solvents Can be illustrated. These solvents can be used alone or as a mixture. The kind of solvent and the liquid viscosity may be adjusted according to the application method of the resin paint.
　樹脂塗料を基材表面に塗布する方法は、特に限定されないが、例えば、スプレーコーティングなどの方法を採用できる。樹脂塗料は、基材の少なくともベルト部材と摺動する摺動面に塗布すればよい。 The method of applying the resin paint to the substrate surface is not particularly limited, but for example, a method such as spray coating can be adopted. The resin paint may be applied to at least a sliding surface of the substrate that slides with the belt member.
　この工程における乾燥は、次の凹部形成工程で凹部が形成できる程度まで行なう。樹脂塗料に溶剤類が多く残存している状態では、樹脂塗膜に流動性があり、転写などにより凹部形状を形成しても、塗料が流れて潰れてしまう。樹脂塗膜中に溶剤類が一部残存していても、凹部形成時に凹溝などを潰さない程度の流動性となるまで乾燥してあればよい。具体的には、樹脂塗膜中の固形成分の割合が７０重量％以上になった状態である。これは塗装前と塗装直後と乾燥後の製品重量を測定することで容易に管理することができる。また、乾燥後の樹脂塗膜の膜厚を１２～３６μｍにすることで焼成後の樹脂塗膜の膜厚が所望する膜厚に形成可能である。なお、焼成後に仕上げ加工をする場合は、乾燥後の樹脂塗膜の膜厚を２０～５０μｍに形成してもよい。 The drying in this step is performed to such an extent that a recess can be formed in the next recess formation step. In a state where a lot of solvents remain in the resin paint, the resin coating film has fluidity, and even if the concave shape is formed by transfer or the like, the paint flows and is crushed. Even if a part of the solvent remains in the resin coating film, it may be dried until the fluidity is such that the grooves are not crushed when the recesses are formed. Specifically, the ratio of the solid component in the resin coating film is 70% by weight or more. This can be easily managed by measuring the product weight before painting, immediately after painting and after drying. Further, by setting the film thickness of the resin coating film after drying to 12 to 36 μm, the film thickness of the resin coating film after baking can be formed to a desired film thickness. When finishing is performed after firing, the thickness of the resin coating film after drying may be formed to 20 to 50 μm.
（２）凹部形成工程
　この樹脂塗膜の表面に、塗膜焼成工程後に潤滑剤保持部となる凹部を加工形成する工程である。先の樹脂塗膜形成工程で得られた樹脂塗膜は、焼成後の樹脂塗膜と比較すると硬度が低く、柔らかい状態である。本工程は、これを利用して樹脂塗膜形成工程の直後に実施する。本工程で形成された凹部が、次工程の焼成を経て、最終的な摺動部材における樹脂塗膜表面の潤滑剤保持部となる。この凹部と最終的な潤滑剤保持部の形状は、ほぼ同じとなる。 (2) Concave formation process It is a process of processing and forming the concave part used as a lubricant holding part after the coating film baking process on the surface of this resin coating film. The resin coating film obtained in the previous resin coating film forming step has a low hardness and a soft state as compared with the resin coating film after firing. This process is carried out immediately after the resin coating film forming process using this. The concave portion formed in this step becomes a lubricant holding portion on the surface of the resin coating film in the final sliding member through the firing of the next step. The shape of the concave portion and the final lubricant holding portion are substantially the same.
　凹部の形状は、特に限定されず、ディンプル凹穴、凹溝など、任意の形状とできる。また、この凹部の深さは、基材表面まで到達するものであってもよい。凹溝としては、例えば、一方向斜め模様溝、アヤメ模様溝などの幾何学模様溝、または、ヘリングボーン溝、スパイラル溝などの流体動圧溝とできる。これらの凹溝は、摺動方向と直交する方向に形成することが好ましい。 The shape of the recess is not particularly limited, and can be any shape such as a dimple recess or a recess. Moreover, the depth of this recessed part may reach the base material surface. The concave groove may be, for example, a geometric pattern groove such as a unidirectional oblique pattern groove or an iris pattern groove, or a fluid dynamic pressure groove such as a herringbone groove or a spiral groove. These concave grooves are preferably formed in a direction perpendicular to the sliding direction.
　図３に示すように、一方向斜め模様溝（図３（ｂ））やアヤメ模様溝（図３（ａ））は、通紙方向に対して一方向または二方向（アヤメ）に傾斜し、かつ、それぞれが一定の間隔で整列した筋状の溝から構成されている。本工程において、このような溝は、例えばローレット駒を樹脂塗膜の表面に回転させながら押し付けることで形成できる。本工程では、塗膜形成後（焼成後）にその表面に凹部を形成する場合や樹脂塗膜形成前に基材表面に凹部を形成する場合では形成できないような微細な凹部形状を形成することが好ましい。よって、上記の一方向斜め模様溝やアヤメ模様溝としては、溝幅３０～５００μｍ（好ましくは３０～１００μｍ）、ピッチ０．４～１．５ｍｍ（好ましくは０．５～１．０ｍｍ）の模様溝とすることが好ましい。 As shown in FIG. 3, the one-way diagonal pattern groove (FIG. 3B) and the iris pattern groove (FIG. 3A) are inclined in one direction or two directions (iris) with respect to the paper passing direction. And each is comprised from the streak-like groove | channel arranged with a fixed space | interval. In this step, such a groove can be formed by, for example, pressing a knurling piece while rotating it on the surface of the resin coating film. In this step, a fine concave shape that cannot be formed when a concave portion is formed on the surface after coating film formation (after firing) or when a concave portion is formed on the substrate surface before resin coating film formation is formed. Is preferred. Therefore, as the unidirectional oblique pattern groove or iris pattern groove, a pattern having a groove width of 30 to 500 μm (preferably 30 to 100 μm) and a pitch of 0.4 to 1.5 mm (preferably 0.5 to 1.0 mm). A groove is preferable.
　ヘリングボーン溝、スパイラル溝などの流体動圧溝形状は、それぞれの形状に応じた転写部材を押し付けることで転写形成できる。上記のアヤメ模様溝などと同様の理由で微細化を図るため、溝幅としては１００μｍ程度が好ましい。 流体 Fluid dynamic pressure groove shapes such as herringbone grooves and spiral grooves can be formed by pressing a transfer member corresponding to each shape. In order to achieve miniaturization for the same reason as the iris pattern groove, the groove width is preferably about 100 μm.
　また、凹部をディンプル凹穴とする場合、上記のアヤメ模様溝などと同様の理由で微細化を図るため、φ１．５ｍｍ以下の凹が１ｃｍ２に２５個以上とすることが好ましい。より好ましくは、φ１．０ｍｍ以下の凹が１ｃｍ２に５０個以上である。 Further, in the case where the concave portion is a dimple concave hole, it is preferable that the number of the concaves having a diameter of 1.5 mm or less is 25 or more per 1 cm 2 in order to achieve miniaturization for the same reason as the iris pattern groove. More preferably, there are 50 or more recesses having a diameter of 1.0 mm or less per 1 cm 2 .
（３）塗膜焼成工程
　この工程は、先の凹部形成工程で凹部が形成された樹脂塗膜を焼成して硬化させる工程である。焼成は、マトリックス樹脂に応じた焼成温度で所定時間行なう。この焼成工程を経て、樹脂塗膜が焼き固められて、所定形状の潤滑剤保持部を有する強固な樹脂塗膜が得られる。 (3) Coating film baking process This process is a process of baking and curing the resin coating film in which the recesses are formed in the previous recess forming process. Baking is performed for a predetermined time at a baking temperature corresponding to the matrix resin. Through this firing step, the resin coating film is baked and hardened to obtain a strong resin coating film having a lubricant holding portion having a predetermined shape.
　この摺動部材における樹脂塗膜の厚さは、１０μｍ～３０μｍ程度である。潤滑剤保持部を潰さない範囲で、焼成工程後の樹脂塗膜の表面を研磨し、最終仕上げを行なってもよい。この製造方法で得られる潤滑剤保持部を有する摺動部材は、該保持部の微細さから、ベルトとの直接の摺動面積を減少できる。さらに、保持部は溝潰れなどがなく精密に形成されているため、潤滑剤が摺動面全体に行き届きやすく、摺動面全体にわたり低摩擦化が図れ、経時的な摩擦係数の向上も抑制できる。 The thickness of the resin coating on this sliding member is about 10 μm to 30 μm. As long as the lubricant holding part is not crushed, the surface of the resin coating film after the firing step may be polished and final finished. The sliding member having the lubricant holding portion obtained by this manufacturing method can reduce the direct sliding area with the belt due to the fineness of the holding portion. Furthermore, since the holding part is precisely formed without crushing the groove, the lubricant can easily reach the entire sliding surface, the friction can be reduced over the entire sliding surface, and the improvement of the friction coefficient over time can be suppressed. .
　この摺動部材の樹脂塗膜において、更なる摩擦摩耗特性などの向上を図るため、上述のマトリックス樹脂に、配合剤として少なくともフッ素樹脂粉末と黒鉛粉末とを配合することが好ましい。 In the resin coating film of this sliding member, in order to further improve the friction and wear characteristics and the like, it is preferable to blend at least a fluororesin powder and a graphite powder as a compounding agent in the above matrix resin.
　フッ素樹脂としては、低摩擦性と非粘着性を樹脂塗膜に付与でき、かつ耐熱性を有するものであれば使用できる。フッ素樹脂としては、例えば、ＰＴＦＥ樹脂、テトラフルオロエチレン－パーフルオロアルキルビニルエーテル（ＰＦＡ）共重合体樹脂、テトラフルオロエチレン－ヘキサフルオロプロピレン（ＦＥＰ）共重合体樹脂、テトラフルオロエチレン－エチレン（ＥＴＦＥ）共重合体樹脂などが挙げられる。これらの中でも、ＰＴＦＥ樹脂の粉末を用いることが好ましい。 Fluorine resin can be used as long as it can impart low friction and non-adhesiveness to the resin coating film and has heat resistance. Examples of the fluororesin include PTFE resin, tetrafluoroethylene-perfluoroalkyl vinyl ether (PFA) copolymer resin, tetrafluoroethylene-hexafluoropropylene (FEP) copolymer resin, and tetrafluoroethylene-ethylene (ETFE) copolymer. Polymer resin etc. are mentioned. Among these, it is preferable to use PTFE resin powder.
　ＰＴＦＥ樹脂粉末を用いる場合、その平均粒子径（レーザー解析法による測定値）は、特に限定されるものではないが、樹脂塗膜の表面平滑性を維持するため、３０μｍ以下とすることが好ましい。 When PTFE resin powder is used, its average particle diameter (measured value by laser analysis method) is not particularly limited, but is preferably 30 μm or less in order to maintain the surface smoothness of the resin coating film.
　ＰＴＦＥ樹脂粉末としては、ＰＴＦＥ樹脂をその融点以上で加熱焼成したものを使用できる。また、加熱焼成した粉末に、さらにγ線または電子線などを照射した粉末も使用できる。これらのＰＴＦＥ樹脂粉末は、加熱焼成などされていないＰＴＦＥ樹脂（モールディングパウダー、ファインパウダー）と比較して、樹脂塗料中での均一分散性に優れ、形成された樹脂塗膜の耐摩耗性が優れる。 As the PTFE resin powder, a PTFE resin obtained by heating and baking at a melting point or higher can be used. Further, a powder obtained by further irradiating a heat-fired powder with γ rays or electron beams can also be used. These PTFE resin powders are superior in uniform dispersibility in a resin coating and superior in wear resistance of the formed resin coating film, compared to PTFE resins (molding powder, fine powder) that are not heated and fired. .
　上記ＰＴＦＥ樹脂などのフッ素樹脂は、樹脂塗膜においてマトリックス樹脂１００重量部に対して２５～７０重量部配合することが好ましい。フッ素樹脂の配合量が２５重量部未満であると、低摩擦性が劣化し、発熱による摩耗促進が発生するおそれがある。一方、フッ素樹脂の配合量が７０重量部をこえると低摩擦性は優れるが、塗膜強度および耐摩耗性が劣化するおそれがある。 Fluorine resin such as PTFE resin is preferably blended in an amount of 25 to 70 parts by weight based on 100 parts by weight of the matrix resin in the resin coating. When the blending amount of the fluororesin is less than 25 parts by weight, the low friction property is deteriorated, and there is a risk that accelerated wear due to heat generation occurs. On the other hand, if the blending amount of the fluororesin exceeds 70 parts by weight, the low friction property is excellent, but the coating film strength and wear resistance may be deteriorated.
　黒鉛は、固体潤滑剤として優れた特性を有することは周知である。黒鉛は、天然黒鉛と人造黒鉛に大別されるが、いずれも使用できる。また、形状としては、りん片状、粒状、球状などがあるが、いずれも使用できる。 It is well known that graphite has excellent properties as a solid lubricant. Graphite is roughly classified into natural graphite and artificial graphite, and any of them can be used. The shape includes flakes, granules, and spheres, but any of them can be used.
　黒鉛としては、固定炭素９７．５％以上の黒鉛の使用が好ましく、さらには、固定炭素９８．５％以上の人造黒鉛が好ましい。このような黒鉛は、潤滑油とのなじみ性が高く、表面の一部に潤滑油が付着していなくても黒鉛中に微量に含浸された潤滑油によって潤滑性が維持される。 As graphite, it is preferable to use graphite having 97.5% or more of fixed carbon, and artificial graphite having 98.5% or more of fixed carbon is more preferable. Such graphite has high compatibility with the lubricating oil, and even if the lubricating oil does not adhere to a part of the surface, the lubricating property is maintained by the lubricating oil impregnated in a trace amount in the graphite.
　上記黒鉛は、樹脂塗膜においてマトリックス樹脂１００重量部に対して１～２０重量部配合することが好ましい。黒鉛の配合量が１重量部未満であると黒鉛を配合した場合の十分な効果が得られない。一方、黒鉛の配合量が２０重量部をこえると樹脂塗膜の密着性を損ない、剥がれの原因となり得る。 The graphite is preferably blended in an amount of 1 to 20 parts by weight with respect to 100 parts by weight of the matrix resin in the resin coating. When the blending amount of graphite is less than 1 part by weight, a sufficient effect cannot be obtained when graphite is blended. On the other hand, if the blending amount of graphite exceeds 20 parts by weight, the adhesiveness of the resin coating film is impaired, which may cause peeling.
　樹脂塗膜は、上記マトリックス樹脂、フッ素樹脂、黒鉛の他に、本発明の摺動部材の必要特性を著しく低下させない範囲であれば他の添加剤を含んでも構わない。なお、マトリックス樹脂に対するフッ素樹脂や黒鉛などの添加剤の総量が１５重量部より少ないと、樹脂塗膜にムラが発生し、所要の寸法精度を得ることが難しくなる。 The resin coating film may contain other additives in addition to the matrix resin, fluororesin, and graphite as long as the required characteristics of the sliding member of the present invention are not significantly reduced. If the total amount of additives such as fluororesin and graphite relative to the matrix resin is less than 15 parts by weight, unevenness occurs in the resin coating film, making it difficult to obtain the required dimensional accuracy.
　また、樹脂塗膜の引張せん断接着強さが２５ＭＰａ以上であることが好ましい。この場合、摺動部材の基材と樹脂塗膜との密着強度が高くなり、ベルトとの接触面圧が高くなる場合でも安定して使用できる。マトリックス樹脂としてＰＡＩ樹脂を用い、フッ素樹脂粉末と黒鉛粉末を上記の好適配合範囲で含めた樹脂塗膜であれば、引張せん断接着強さ２５ＭＰａ以上を達成できる。 Further, it is preferable that the tensile shear adhesive strength of the resin coating film is 25 MPa or more. In this case, even if the contact strength between the base material of the sliding member and the resin coating film is high and the contact surface pressure with the belt is high, it can be used stably. If the PAI resin is used as the matrix resin and the resin coating film includes the fluororesin powder and the graphite powder in the above-described preferred blending range, a tensile shear bond strength of 25 MPa or more can be achieved.
［実験例］
　切削後に研磨加工した平板状のＳＵＳ３０４を基材とし、ショットブラストを行ない表面粗度を高めた。この基材に以下の樹脂塗料を塗布し、９０℃で２０分間乾燥させた。この時の樹脂塗膜の膜厚は３０μｍであった。その直後、ローレット駒を回転させながら押し付けて基材が露出するかしないかの圧力でアヤメ模様溝を形成した。これを２４０℃で１時間焼成し、樹脂塗膜を得た。焼成後の樹脂塗膜の膜厚は２５μｍであった。得られた摺動部材の樹脂塗膜の表面の写真を図４に示す。この写真において、潤滑剤保持部であるアヤメ模様溝のピッチは０．７ｍｍであり、溝幅は１００μｍであった。 [Experimental example]
Using a flat SUS304 polished after cutting as a base material, shot blasting was performed to increase the surface roughness. The following resin coating was applied to the substrate and dried at 90 ° C. for 20 minutes. At this time, the thickness of the resin coating film was 30 μm. Immediately after that, the iris pattern groove was formed by the pressure whether or not the base material was exposed by pressing while rotating the knurling piece. This was baked at 240 ° C. for 1 hour to obtain a resin coating film. The film thickness of the resin coating after firing was 25 μm. FIG. 4 shows a photograph of the surface of the resin coating film of the obtained sliding member. In this photograph, the pitch of the iris pattern groove as the lubricant holding portion was 0.7 mm, and the groove width was 100 μm.
　樹脂塗料の固形分は以下のとおりである。樹脂塗料は、ＰＡＩ樹脂をＮ－メチルピロリドンに分散させたＰＡＩ樹脂ワニスを用い、これにＰＴＦＥ樹脂と黒鉛粉末を配合して希釈して調整した。ＰＴＦＥ樹脂は、ＰＡＩ樹脂１００重量部に対して４５重量部、黒鉛粉末は、ＰＡＩ樹脂１００重量部に対して１０重量部、それぞれ配合した。
　(ａ)ＰＴＦＥ：ＰＴＦＥ樹脂（平均粒子径１０μｍ、加熱焼成材）
　(ｂ)ＰＡＩ：ガラス転移温度２４５℃品
　(ｃ)黒鉛粉末：人造黒鉛（平均粒子径１０μｍ） The solid content of the resin paint is as follows. As the resin coating, a PAI resin varnish in which a PAI resin was dispersed in N-methylpyrrolidone was used, and this was mixed with a PTFE resin and graphite powder and diluted. 45 parts by weight of PTFE resin was added to 100 parts by weight of PAI resin, and 10 parts by weight of graphite powder was added to 100 parts by weight of PAI resin.
(a) PTFE: PTFE resin (average particle size 10 μm, heat-fired material)
(b) PAI: Glass transition temperature 245 ° C. (c) Graphite powder: Artificial graphite (average particle size 10 μm)
　図４に示すように、本発明の製造方法では、摺動部材の樹脂塗膜の表面において微細で精密な潤滑剤保持部が形成できる。 As shown in FIG. 4, in the manufacturing method of the present invention, a fine and precise lubricant holding portion can be formed on the surface of the resin coating film of the sliding member.
　本発明の定着装置用摺動部材の製造方法は、摺動面に樹脂塗膜を有する定着装置用摺動部材において、この樹脂塗膜の表面に潤滑剤保持部となる微細な凹溝などを形成できるので、ベルトニップ方式の定着装置に用いる摺動部材の製造方法として好適である。 The manufacturing method of the sliding member for a fixing device according to the present invention includes a sliding member for a fixing device having a resin coating film on the sliding surface. Since it can be formed, it is suitable as a manufacturing method of a sliding member used in a belt nip type fixing device.
　　１　定着装置
　　２　加熱ローラ
　　３　加圧ベルト
　　４　押圧部材
　　５　摺動部材
　　６　ニップ部
　　７　用紙 DESCRIPTION OF SYMBOLS 1 Fixing device 2 Heating roller 3 Pressure belt 4 Pressing member 5 Sliding member 6 Nip part 7 Paper

Claims (6)

  1. 　加熱手段により加熱され、駆動手段により回転する定着部材と、前記定着部材の回転とともに回転するベルト部材と、該ベルト部材を前記定着部材側に押圧する押圧部材とを有し、前記ベルト部材を介して前記定着部材との間でニップ部を形成する定着装置において、前記ベルト部材と前記押圧部材との間に介在させる摺動部材の製造方法であって、
    　該製造方法は、前記摺動部材の基材の少なくとも前記ベルト部材と摺動する摺動面に、マトリックス樹脂を含む樹脂塗料を塗布した後に乾燥させて樹脂塗膜を形成する塗膜形成工程と、この樹脂塗膜を焼成して硬化させる塗膜焼成工程とを備え、
    　前記塗膜形成工程の後、前記塗膜焼成工程の前に、前記樹脂塗膜の表面に、前記塗膜焼成工程後に潤滑剤保持部となる凹部を加工形成する凹部形成工程を有することを特徴とする定着装置用摺動部材の製造方法。     A fixing member heated by a heating unit and rotated by a driving unit; a belt member rotating with the rotation of the fixing member; and a pressing member pressing the belt member toward the fixing member. In the fixing device for forming a nip portion with the fixing member, a method for manufacturing a sliding member interposed between the belt member and the pressing member,
    The manufacturing method includes a coating film forming step of forming a resin coating film by applying a resin paint containing a matrix resin to a sliding surface sliding with at least the belt member of the base member of the sliding member and then drying the coating material. A coating film baking step for baking and curing the resin coating film,
    After the coating film forming step, and before the coating film baking step, the resin coating film surface has a recess forming step for forming a recess to be a lubricant holding portion after the coating film baking step. A manufacturing method of a sliding member for a fixing device.
  2. 　前記マトリックス樹脂が、ポリアミドイミド樹脂であることを特徴とする請求項１記載の定着装置用摺動部材の製造方法。 The method for manufacturing a sliding member for a fixing device according to claim 1, wherein the matrix resin is a polyamide-imide resin.
  3. 　前記樹脂塗膜は、前記マトリックス樹脂に少なくともフッ素樹脂粉末と黒鉛粉末とを含む樹脂塗膜であり、該樹脂塗膜は、前記マトリックス樹脂１００重量部に対して前記フッ素樹脂を２５～７０重量部、前記黒鉛を１～２０重量部含むことを特徴とする請求項１記載の定着装置用摺動部材の製造方法。 The resin coating is a resin coating containing at least fluororesin powder and graphite powder in the matrix resin, and the resin coating comprises 25 to 70 parts by weight of the fluororesin with respect to 100 parts by weight of the matrix resin. The method for producing a sliding member for a fixing device according to claim 1, wherein the graphite is contained in an amount of 1 to 20 parts by weight.
  4. 　前記フッ素樹脂がポリテトラフルオロエチレン樹脂であり、前記黒鉛が固定炭素９７．５％以上の黒鉛であることを特徴とする請求項３記載の定着装置用摺動部材の製造方法。 The method for manufacturing a sliding member for a fixing device according to claim 3, wherein the fluororesin is a polytetrafluoroethylene resin, and the graphite is graphite having a fixed carbon of 97.5% or more.
  5. 　前記凹部形成工程で加工形成する前記凹部が、幾何学模様溝または流体動圧溝であることを特徴とする請求項１記載の定着装置用摺動部材の製造方法。 2. The method of manufacturing a sliding member for a fixing device according to claim 1, wherein the concave portion processed and formed in the concave portion forming step is a geometric pattern groove or a fluid dynamic pressure groove.
  6. 　前記凹部形成工程で加工形成する前記凹部が、前記幾何学模様溝であり、この幾何学模様溝が、一方向斜め模様溝またはアヤメ模様溝であることを特徴とする請求項５記載の定着装置用摺動部材の製造方法。 6. The fixing device according to claim 5, wherein the concave portion processed and formed in the concave portion forming step is the geometric pattern groove, and the geometric pattern groove is a unidirectional oblique pattern groove or an iris pattern groove. Manufacturing method for a sliding member.
PCT/JP2016/077346 2015-09-17 2016-09-15 Method for manufacturing sliding member for fixing device WO2017047724A1 (en)

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JP2019108968A (en) * 2017-12-19 2019-07-04 Ntn株式会社 Foil bearing, foil bearing unit, turbomachine, and method of manufacturing foil bearing
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