CN110468325A - 环形金属带及其制造方法 - Google Patents
环形金属带及其制造方法 Download PDFInfo
- Publication number
- CN110468325A CN110468325A CN201910370706.XA CN201910370706A CN110468325A CN 110468325 A CN110468325 A CN 110468325A CN 201910370706 A CN201910370706 A CN 201910370706A CN 110468325 A CN110468325 A CN 110468325A
- Authority
- CN
- China
- Prior art keywords
- becket
- innermost layer
- beckets
- tape member
- metal belt
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 82
- 239000002184 metal Substances 0.000 title claims abstract description 82
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 39
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 238000006396 nitration reaction Methods 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 14
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 10
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 10
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 26
- 229910052757 nitrogen Inorganic materials 0.000 claims description 13
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 230000035882 stress Effects 0.000 description 18
- 239000011651 chromium Substances 0.000 description 15
- 229910001240 Maraging steel Inorganic materials 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 7
- 239000011572 manganese Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 230000009467 reduction Effects 0.000 description 6
- 238000000137 annealing Methods 0.000 description 5
- 239000012298 atmosphere Substances 0.000 description 5
- 238000003801 milling Methods 0.000 description 5
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 230000032683 aging Effects 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 4
- 239000010931 gold Substances 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 230000005764 inhibitory process Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 239000012299 nitrogen atmosphere Substances 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000004881 precipitation hardening Methods 0.000 description 2
- 230000017260 vegetative to reproductive phase transition of meristem Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- F16G5/00—V-belts, i.e. belts of tapered cross-section
- F16G5/16—V-belts, i.e. belts of tapered cross-section consisting of several parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/30—Belts or like endless load-carriers
- B65G15/48—Belts or like endless load-carriers metallic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/14—Bending sheet metal along straight lines, e.g. to form simple curves by passing between rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/14—Making other particular articles belts, e.g. machine-gun belts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/16—Making other particular articles rings, e.g. barrel hoops
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D29/00—Producing belts or bands
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- C—CHEMISTRY; METALLURGY
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
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- C—CHEMISTRY; METALLURGY
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
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- C21D6/007—Heat treatment of ferrous alloys containing Co
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- C—CHEMISTRY; METALLURGY
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C—ALLOYS
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
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- C22C—ALLOYS
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
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- Engineering & Computer Science (AREA)
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- Materials Engineering (AREA)
- Metallurgy (AREA)
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Abstract
本发明提供环形金属带及其制造方法。该环形金属带能够充分减小最内层的金属环受到的拉伸应力,且耐磨性优异。该环形金属带具备:带部件,层叠多个金属环而成;及金属片,由该带部件支撑,所述多个金属环中的最内层的金属环是马氏体时效钢板,其他金属环在表面具有氮化层,且具有如下化学组成:按照质量%,含有0.30%~0.70%的C、2.50%以下的Si、1.00%以下的Mn、1.00%~4.00%的Cr、0.50%~3.00%的Mo及1.00%以下的V,满足式1:159×C(%)+91×Si(%)+68×Cr(%)+198×Mo(%)+646≥1000的关系,且剩余部分由Fe和不可避免的杂质构成,所述其他金属环的抗拉强度为1700MPa以上,所述氮化层的表面硬度为HV800~HV950。
Description
技术领域
本发明涉及环形金属带及其制造方法。
背景技术
作为无级变速器(CVT),已知有带式CVT。作为带式CVT用的动力传递用带,已知有由层叠金属环而成的带部件和支撑于该带部件的多个金属片构成的环形金属带。
上述带部件在动力传递时,受到张力、弯曲应力、摩擦力等。因此,要求带部件、构成该带部件的金属环具有强度、耐摩擦性等特性,为此开展了各种研究。
作为带部件用金属环的材质之一,已知有具有较高的强度和韧性的马氏体时效钢(例如日本特开昭61-17743号公报)。然而马氏体时效钢含有大量的Ni、Co、Mo等,价格昂贵,因此正在研究可代替的材质。
日本特开昭62-37535号公报中公开有如下结构:在厚度方向上重叠多个环形带状薄板金属带而成的层叠带中,将最内侧的带设定为马氏体时效钢,将其他层设定为沉淀硬化不锈钢。
在日本特开平11-351334号公报中公开有如下结构:在径向上重叠多个较薄的环形带状的金属性环形片材而构成的金属环部件中,将最内周和最外周的环形片材设定为马氏体时效钢,将中间的环形片材设定为沉淀硬化不锈钢。根据日本特开平11-351334号公报,该金属环部件具有足够的强度和耐久性。
此外,在日本特开2011-195861号公报和国际公开第2015/087869号中公开有具有特定的组成且在表面具有氮化层的CVT用环部件。
本发明人们发现,如后述比较例所示,在将构成带部件的金属环设定为相同材质的情况下,在最内层的金属环会产生比其他层大的拉伸应力。例如如专利文献3所示,通过在中间层使用沉淀硬化不锈钢,预计会缓和最内层的拉伸应力。然而,不锈钢通常含有10%以上的Cr,因此氮化处理困难。故而,不锈钢的耐磨性低,特别是存在与金属片的颈部13(参见图1)接触的环端面磨损的问题。
发明内容
本发明鉴于这样的实际情况而完成,目的在于提供能够充分减小最内层的金属环受到的拉伸应力、耐磨性优异的环形金属带及其制造方法。
本实施方式的环形金属带是具备层叠多个金属环而成的带部件和由该带部件支撑的金属片的环形金属带,所述多个金属环中的最内层的金属环为马氏体时效钢板,其他金属环在表面具有氮化层,且具有如下化学组成:按照质量%,含有0.30%~0.70%的C、2.50%以下的Si、1.00%以下的Mn、1.00%~4.00%的Cr、0.50%~3.00%的Mo及1.00%以下的V,满足式1:159×C(%)+91×Si(%)+68×Cr(%)+198×Mo(%)+646≥1000的关系,且剩余部分由Fe和不可避免的杂质构成,所述其他金属环的抗拉强度为1700MPa以上,所述氮化层的表面硬度为HV800~HV950。
上述环形带的一实施方式的所述最内层的金属环比所述其他金属环薄。
本实施方式的环形金属带的制造方法具有如下步骤:通过将具有如下化学组成的金属板成形为环状并进行氮化处理,来制造金属环,所述化学组成为,按照质量%,含有0.30%~0.70%的C、2.50%以下的Si、1.00%以下的Mn、1.00%~4.00%的Cr、0.50%~3.00%的Mo及1.00%以下的V,满足式1:159×C(%)+91×Si(%)+68×Cr(%)+198×Mo(%)+646≥1000的关系,且剩余部分由Fe和不可避免的杂质构成;通过另行将比所述金属板薄的马氏体时效钢板成形为环状,来制造最内层用金属环;在所述最内层用金属环的外周层叠一个以上所述金属环,制成带部件;及在所述带部件上配置金属片。
根据本发明,能够提供能够充分减小最内层的金属环受到的拉伸应力且耐磨性优异的环形金属带及其制造方法。
以下的详细说明和例举性附图将更全面地阐述本发明的上述目的、其他目的、特征、优点,且下述内容和附图不应视为对本发明的限制。
附图说明
图1是示出本实施方式的环形金属带的一例的示意剖视图。
图2是示出本实施方式的环形金属带的一例的示意局部立体图。
图3是示出本实施方式的环形金属带的制造方法的一例的流程图。
图4是示出金属环的制造步骤的一例的流程图。
图5是示出最内层的金属环的制造步骤的一例的流程图。
图6是示出实施例和比较例的金属环的最大拉伸应力的图表。
具体实施方式
首先,参照图1和图2,说明本实施方式的环形金属带的构成。图1是示出本实施方式的环形金属带的一例的示意剖视图,图2是示出本实施方式的环形金属带的一例的示意局部立体图。
图1和图2的例子所示的环形金属带100具备层叠多个金属环1而成的带部件10和金属片20。该金属片20能够从公知的金属片中适当地选择使用。在图1的例子中,该金属片20具有基体部11、头部12及连接它们的颈部13,在头部具有凸部14,在该凸部的背面具有凹部(未图示)。基体部11的侧面15通常与带轮接触。两个带部件10分别配置于由金属片20的基体部11、头部12及颈部13形成的间隙中,来支撑金属片。金属片20通常如图2的例子所示,具有多个,凸部14与其它金属片的凹部卡合而配置。图2是环形金属带的一部分,金属片20配置于带部件10的整个圆周上。
在这样的环形金属带100中,构成带部件10的最内层的金属环1a与金属片20的鞍面16接触。另外,带部件10的侧面与金属片20的颈部13接触。
本实施方式的环形金属带使用高强度且高韧性的马氏体时效钢作为带部件的最内层的金属环;使用在表面具有表面硬度为HV800~950的氮化层且抗拉强度为1700MPa以上的具有上述特定组成的钢作为其他金属环。其结果是,抑制最内层受到的拉伸应力,且抑制因带部件侧部与金属片的接触所致的磨损,提高环形金属带的耐久性。另外,通过仅将最内层设定为马氏体时效钢,也能减少成本。
另外,在本实施方式中,将最内层的金属环以外的金属环统称为其他金属环。
构成带部件的最内层的马氏体时效钢是C(碳)为0.03%以下且Ni(镍)、Co(钴)、Ti(钛)及Al(铝)合计含有30%以上的钢材,是通过进行时效处理而具有高强度和高韧性的钢材。
在本实施方式中,马氏体时效钢的化学组成只要在公知的范围内适当地选择即可。作为一例,能够设定为如下化学组成等:按照质量%,含有0.03%以下的C、18~19%的Ni、8.5~9.5%的Co、4.7~5.2%的Mo、0.4~0.7%的Ti及0.05~0.15%的Al,也可以含有0.5~1.5%的Cr(铬),剩余部分由Fe(铁)和不可避免的杂质构成。
马氏体时效钢的时效处理方法并不特别限定,例如,能够通过在氮气氛或者还原气氛下,以450~500℃左右的温度实施90~180分钟左右,来实施时效处理。
本实施方式中所使用的马氏体时效钢还实施氮化处理。通过进行氮化处理,能够提高表面硬度。氮化处理例如能够在5~15体积%的氨气、1~3体积%的氢气、剩余为氮气的气氛下,以400~450℃左右的温度实施40~120分钟左右。此外,气氛中的氢气通过氨气的热分解而产生。
在本实施方式中,最内层的金属环的厚度只要根据用途等适当地调整即可,并不特别限定,但作为一例,能够设定为100μm以上且200μm以下。在本实施方式中,最内层的金属环的厚度优选为比后述的其他金属环的厚度薄,更加优选为薄5μm以上。通过减小最内层的金属环的厚度,能够进一步提高最内层的金属环的抗弯曲性。另外,通过使最内层的金属环比其他金属环薄,能够相对缩小与其他环之间的载荷分担比率,更加减小最内层的金属环受到的应力,提高带整体的耐久性。另外,利用5μm以上的板厚差,也能够在中途步骤中检测产品是否错误。
在本实施方式中,所述最内层的金属环以外的其他金属环在表面具有氮化层,且具有如下化学组成:按照质量%,含有0.30%~0.70%的C、2.50%以下的Si、1.00%以下的Mn、1.00%~4.00%的Cr、0.50%~3.00%的Mo及1.00%以下的V,满足式1:159×C(%)+91×Si(%)+68×Cr(%)+198×Mo(%)+646≥1000的关系,且剩余部分由Fe和不可避免的杂质构成,所述其他金属环的抗拉强度为1700MPa以上,所述氮化层的表面硬度为HV800~HV950。通过使用这样的金属环,能够减小最内层的金属环受到的应力,另外,与金属片接触的侧面的耐磨性也优异。
对该其他金属环的化学组成进行说明。
C:0.30%~0.70%
C为了确保强度和韧性而需要在0.30%以上。另一方面,从抑制因形成粗大的碳化物所致的延展性、韧性的降低的观点出发,将C的含有比例设定为0.70%以下。
Si:2.50%以下
从抑制延展性的降低、氮化性的降低的观点出发,Si(硅)设定为2.50%以下。另一方面,从高强度化的观点出发,也可以含有0.10%以上。
Mn:1.00%以下
从抑制延展性的降低的观点出发,Mn(锰)设定为1.00%以下。另一方面,从高强度化的观点出发,也可以含有0.10%以上。
Cr:1.00%~4.00%
从高强度化和提高氮化性的观点出发,Cr设定为1.00%以上。另一方面,当Cr的含有比例提高时,氮化性反而降低,氮化处理变得困难,因此设定为4.00%以下。
Mo:0.50%~3.00%
通过将Mo(钼)的含有比例设定为0.50%以上,由此能够不损坏延展性地提高强度和韧性。另一方面,该强度和韧性的提高效果在3.00%以下就足够了。
V:1.00%以下
为了实现结晶粒径的细化,提高强度、韧性,V(钒)也可以含有0.1%以上。另一方面,从抑制粗大的碳化物、抑制强度和韧性的降低的观点出发,V的含有比例设定为1.00%以下。
Ni:4.00%以下
上述其他金属环还可以含有Ni。通过含有Ni,由此能够抑制碳化物的生成,提高强度、韧性。在含有Ni的情况下,其含有比例优选为4.00%以下,更加优选为2.0%以下。
式1:159×C(%)+91×Si(%)+68×Cr(%)+198×Mo(%)+646≥1000
上述其他金属环通过化学组成满足上式1,而成为金属疲劳强度特性优异、疲劳寿命优异的金属环。
上述其他金属环的化学组成中上述各元素以外的剩余部分为Fe和不可避免的杂质。不可避免的杂质是因原料、制造步骤而不可避免地混入的元素,该元素的种类并不特别限定,但例如可以举出S(硫)、P(磷)、N(氮)、O(氧)、Al、Ti等。
上述其他金属环的抗拉强度为1700MPa以上。通过对其他层使用抗拉强度为1700MPa以上的金属环,由此能够减小最内层的金属环受到的拉伸应力。
在本实施方式中,抗拉强度通过拉伸试验测定,该拉伸试验是将作为对象的金属环挂在一对辊上而借助该一对辊拉伸金属环的试验。此外,在上述拉伸试验中,对至金属环断裂为止的载荷变化进行测定,将抗拉强度设定为最大载荷除以环部件的截面积所得的值。
另外,上述其他金属环的氮化层的表面硬度为HV800~HV950。表面硬度为HV800以上,由此能够抑制与金属片接触的环侧面的磨损。另一方面,通过将表面硬度设定为HV950以下,能够抑制环的脆化,确保强度。
在本实施方式中,其他金属环的厚度只要根据用途等适当地调整即可,并不特别限定,但作为一例,能够设定为100μm以上且200μm以下。
另外,在其他金属环中,氮化层的厚度并不特别限定,但例如,能够设定为5μm以上且50μm以下。
在本实施方式中,构成一个带部件的金属环的层叠数只要最内层的金属环与其他金属环的合计至少为2层即可,例如可以设定为2~12层。
接下来,参照图3,说明环形金属带的制造方法。图3是示出本实施方式的环形金属带的制造方法的一例的流程图。图3的例子所示的环形金属带的制造方法具有:使用具有特定化学组成的金属板制造金属环的步骤(S11)、另行使用马氏体时效钢板制造最内层用金属环的步骤(S12)、在所述最内层用金属环的外周层叠所述其他金属环而成形带部件的步骤(S13)及在带部件配置金属片来制造环形金属带的步骤(S14)。根据本实施方式的制造方法,能够充分减小最内层的金属环受到的拉伸应力,适当地制造耐磨性优异的前述环形金属带。另外,本实施方式的制造方法使用所述马氏体时效钢板比所述金属板薄的金属环,因此能够防止将外观上难以辨别的马氏体时效钢板与所述金属板弄错。
这里,参见图4,说明制造金属环的步骤(S11)的详情。图4是示出金属环的制造步骤的一例的流程图。如图4的例子所示,金属环的制造方法具有金属板的切断步骤(S21)、焊接步骤(S22)、退火步骤(S23)、环切断步骤(S24)、轧制步骤(S25)、淬火步骤(S26)、周长调整步骤(S27)及氮化处理步骤(S28),根据需要,也可以具有例如在淬火步骤(S26)后实施的回火步骤等其他步骤。
钢材(金属板)的切断步骤(S21)是将卷状等长条的金属板切成预定大小的步骤。将所切出的金属板的端部彼此对接,将金属板弯曲成筒状。
在焊接步骤(S22)中,对制成了筒状的金属板的端部彼此对接了的部位进行焊接,形成筒状的卷筒。
接下来,在退火步骤(S23)中,对所述卷筒进行退火,去除因所述焊接而产生的形变。
接下来,在环切断步骤(S24)中,将退火后的卷筒切断为预定的宽度,形成多个环。所得到的环根据需要为了去除在切断时形成的毛刺,也可以实施滚磨等。
在轧制步骤(S25)中,对所得到的金属环进行轧制,使金属环接近预定的周长。在轧制步骤后,实施淬火步骤(S26),根据需要,在该淬火步骤后,实施回火步骤。
淬火步骤(S26)例如是将金属环加热至850℃~1000℃后快速冷却。并且,回火步骤能够在例如400~500℃且氮化处理温度以下进行。
接下来,通过周长调整步骤(S27),将金属环设定为预定的周长。周长调整步骤例如首先准备旋转轴相互平行且配设为能够在接近/分离方向上移动的两个旋转带轮。接下来,沿着该旋转带轮,卷绕金属环,之后,通过一边使带轮旋转一边使旋转轴逐渐分离,由此使金属环延伸,调整周长。
周长调整后的金属环实施氮化处理步骤(S28)。氮化处理例如能够在5~15体积%的氨气、1~3体积%的氢气、剩余为氮气的气氛下,以400~450℃左右的温度实施40~120分钟左右。
这样,能够得到抗拉强度为1700MPa以上且氮化层的表面硬度为HV800~HV950的金属环。
接下来,参照图5,说明最内层用金属环的制造步骤(S12)。图5是示出最内层的金属环的制造步骤的一例的流程图。如图5的例子所示,最内层用金属环使用前述的马氏体时效钢,通过实施该马氏体时效钢的切断步骤(S31)、焊接步骤(S32)、退火步骤(S33)、环切断步骤(S34)、轧制步骤(S35),根据需要而实施的固溶步骤(S36)、周长调整步骤(S37)、时效步骤(S38)及氮化处理步骤(S39)来制造。
这里,固溶步骤(S36)能够去除在轧制时产生的加工应力,根据需要在轧制步骤后实施。固溶步骤例如能够在820~860℃的范围、在1~3分钟的条件下实施。
时效步骤(S38)例如能够在氮气氛或者还原气氛下,以450~500℃左右的温度,实施90~180分钟左右。
另外,氮化处理步骤(S39)例如能够在5~15体积%的氨气、1~3体积%的氢气、剩余为氮气的气氛下,以400~450℃左右的温度,在40~120分钟左右的条件下实施。
【实施例】
以下,例举实施例和比较例,具体说明本发明。此外,这些记载并不限定本发明。
<制造例1:金属环1的制造>
准备长条的马氏体时效钢板,按照前述的金属环的制造步骤,制造出厚度约180μm、杨氏模量为190GPa的金属环1。
<制造例2:金属环2的制造>
准备按照质量%含有0.30%~0.70%的C、2.50%以下的Si、1.00%以下的Mn、1.00%~4.00%的Cr、0.50%~3.00%的Mo及1.00%以下的V、满足式1:159×C(%)+91×Si(%)+68×Cr(%)+198×Mo(%)+646≥1000的关系并且剩余部分为Fe的长条的金属板,按照前述的金属环的制造步骤,制造出厚度约185μm、氮化层的厚度为30μm、抗拉强度为1700MPa以上、氮化层的表面硬度为HV800~HV950、杨氏模量为210GPa的金属环2。
<实施例:环形金属带的制造>
对最内层使用所述制造例1的金属环1,在该金属环1的外周层叠8个金属环2,得到9层的带部件。使用2个该带部件,如图1和图2所示,配置金属片,得到实施例的环形金属带。
<比较例:环形金属带的制造>
将构成带部件的金属环都采用金属环1,得到9层的带部件。使用2个该带部件,如图1和图2所示配置金属片,得到比较例的环形金属带。
图6对于在实施例和比较例中使用的带部件1、2示出最内层和与最内层相邻的第2层的最大拉伸应力的计算结果。如图6所示,实施例的最内层受到的最大拉伸应力与比较例的最内层受到的最大拉伸应力相比,减小6.4%。在实施例中,推测第2层的最大拉伸应力升高,最内层受到的拉伸应力分散到了其他层。这样,根据本实施方式,能够充分地减小最内层的金属环受到的拉伸应力,能够获得耐磨性优异、耐久性优异的环形金属带。
根据说明的发明内容,显而易见,本发明的实施例可以以多种方式变化。不应将这些变化视为脱离本发明的精神和范围,并且对于本领域技术人员而言显而易见的是,所有修改都包含在所附权利要求的范围内。
Claims (3)
1.一种环形金属带,具备:带部件,层叠多个金属环而成;及金属片,由所述带部件支撑,其中,
所述多个金属环中的最内层的金属环为马氏体时效钢板,
其他金属环在表面具有氮化层,且具有如下化学组成:按照质量%,含有0.30%~0.70%的C、2.50%以下的Si、1.00%以下的Mn、1.00%~4.00%的Cr、0.50%~3.00%的Mo及1.00%以下的V,满足式1:159×C(%)+91×Si(%)+68×Cr(%)+198×Mo(%)+646≥1000的关系,且剩余部分由Fe和不可避免的杂质构成,所述其他金属环的抗拉强度为1700MPa以上,所述氮化层的表面硬度为HV800~HV950。
2.根据权利要求1所述的环形金属带,其中,
所述最内层的金属环比所述其他金属环薄。
3.一种环形金属带的制造方法,其中,具有如下步骤:
通过将具有如下化学组成的金属板成形为环状并进行氮化处理,来制造金属环,所述化学组成为,按照质量%,含有0.30%~0.70%的C、2.50%以下的Si、1.00%以下的Mn、1.00%~4.00%的Cr、0.50%~3.00%的Mo及1.00%以下的V,满足式1:159×C(%)+91×Si(%)+68×Cr(%)+198×Mo(%)+646≥1000的关系,且剩余部分由Fe和不可避免的杂质构成;
通过另行将比所述金属板薄的马氏体时效钢板成形为环状,来制造最内层用金属环;
在所述最内层用金属环的外周层叠一个以上所述金属环,制成带部件;及
在所述带部件上配置金属片。
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JPS6237535A (ja) * | 1985-08-09 | 1987-02-18 | Nhk Spring Co Ltd | 伝動用ベルト |
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NL155927B (nl) * | 1975-10-09 | 1978-02-15 | Doornes Transmissie Bv | Metalen drijfriem, alsmede duwelement daarvoor. |
SU1108272A1 (ru) * | 1981-10-28 | 1984-08-15 | Shmakov Yurij M | Бесконечный приводной клиновой ремень |
JPS597950U (ja) * | 1982-07-09 | 1984-01-19 | トヨタ自動車株式会社 | 無段変速機用駆動ベルト |
JPS6117743A (ja) | 1984-07-04 | 1986-01-25 | Toyota Motor Corp | 動力伝達用無端ベルト |
JPS6228548A (ja) * | 1985-07-27 | 1987-02-06 | Kobe Steel Ltd | 動力伝達用スチ−ルベルト |
JP3524766B2 (ja) * | 1998-06-08 | 2004-05-10 | 本田技研工業株式会社 | 金属vベルト |
JP3611968B2 (ja) * | 1998-06-26 | 2005-01-19 | 本田技研工業株式会社 | 金属vベルトの厚さ設定方法 |
JP3554490B2 (ja) * | 1998-09-25 | 2004-08-18 | 本田技研工業株式会社 | 無段変速機用ベルト |
JP2001262274A (ja) * | 2000-03-22 | 2001-09-26 | Kobe Steel Ltd | 高強度鋼ベルトおよびその製法 |
JP5425675B2 (ja) | 2010-03-18 | 2014-02-26 | 愛知製鋼株式会社 | 無段変速機ベルト及び無段変速機ベルト用鋼 |
JP5432844B2 (ja) * | 2010-07-14 | 2014-03-05 | 東京製綱株式会社 | 無段変速機ベルトに用いられるリング部材 |
JP6202034B2 (ja) * | 2015-04-06 | 2017-09-27 | トヨタ自動車株式会社 | 金属リング及びその製造方法 |
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