CN1953830B - 用于使粉末金属齿轮致密化的方法和设备 - Google Patents
用于使粉末金属齿轮致密化的方法和设备 Download PDFInfo
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Abstract
本发明提供了一种用于使粉末金属预制齿轮坯的齿致密化的方法和设备。该模具包括用于接收齿轮主体的孔和多个用于接收齿轮齿的沟槽。各沟槽具有长度和沿着长度可变化的宽度。该沟槽在与孔成切线的方向上变窄。粉末金属预制齿轮坯被推动通过模具并且齿在沟槽的相对狭窄的部分塑性地和弹性地变形。在穿过沟槽狭窄部分并被压缩之后,齿可以至少部分地恢复。由模具限定的沟槽可以是螺旋形的以用于形成螺旋形沟槽。
Description
技术领域
本发明涉及粉末金属预制坯例如齿轮等的烧结后致密化。
背景技术
粉末金属齿轮及其它粉末金属部件长久以来为锻造部件提供了低成本的替代品。粉末金属成形消除了与机械加工有关的高成本。但是,传统制备的粉末金属部件不具有作为低成本替代品应用到要求高强度的场合(如传动齿轮)所需的足够的强度以及尺寸公差。
增加压实和烧结粉末金属部件的密度可以增加其强度。一种此前已知的增加烧结粉末金属部件密度的技术是滚压成形。例如,粉末金属齿轮可以在成形模具之间滚压从而增加部件的密度,特别是表面上的密度,如美国专利No.5,711,187所示。滚压成形的一个缺点是在滚压成形过程之后粉末金属部件的密度不是均匀的。这个问题可以通过反向滚压成形而略微减轻;但是,与反向滚压成形相关的附加工艺步骤会增加过程的成本和复杂性,并且不能消除该问题。
粉末金属部件也可以经受冲锻从而增加密度。美国专利2,542,912以及5,009,842更详细的描述了冲锻。在冲锻过程中,粉末金属部件被推动通过成形模具的开口,该成形模具使部件成形。成形模具具有封闭端并且部件被压迫抵靠着封闭端从而增强或者实现致密化。被致密化的部件从成形模具的开口端移走。冲锻通常不适于大量的制造。
发明内容
本发明提供了一种用于使粉末金属部件如斜齿轮致密化的方法和设备。该方法包括将具有主体和许多从主体突起的齿的压实粉末金属预制坯进行烧结的步骤。粉末金属预制坯可以被成形为齿轮,例如正齿轮或者斜齿轮。该方法还包括在与主体相切的方向挤压预制坯每一齿的步骤。齿可以被横向地挤压从而使齿致密化以及增加粉末金属部件的强度。
本发明还提供了一种用于挤压预制坯齿的设备。特别地,本发明提供了具有一个孔以及多个沟槽的模具。该模具的孔可以接收预制坯的主体并且沟槽可以逐一地接收齿。沟槽从孔向外延伸并且限定出长度和宽度。
各个单独沟槽的宽度沿着长度变化。特别地,沟槽包括沿着长度的变窄的或者缩颈部分。粉末金属预制坯可以被移动通过模具从而在与粉末金属预制坯主体相切的方向上挤压各齿。
具体地,各个齿可以在沟槽的狭窄部分被挤压。在预制坯被成形为斜齿轮的时候,预制坯可以在移动通过模具的过程中被轴向地移动并且旋转。
附图说明
与以下相关详细说明和附图结合考虑,本发明的这些和其它的特征和优点将变得更加易于理解,其中:
图1是根据本发明实施例的粉末金属预制坯和模具的透视部分剖视图;
图2是图1所示模具的侧剖视图;
图3是图1-2所示模具的第一个顶剖视图,其中的横截面是沿着包括沟槽狭窄部分的平面截取的;
图4是图1-3所示模具的第二个顶剖视图,其中的横截面是沿着包括沟槽较宽部分的平面截取的;以及
图5是包括图1-4所示模具以及许多类似构造的模具的多阶段成形工具的概略轴向剖视图。
具体实施方式
本发明提供了一种用于制备粉末金属制品的方法。该方法包括烧结压实的粉末金属预制坯10的步骤,该粉末金属预制坯10具有主体直径为14的圆柱形主体12。预制坯10还包括许多从圆柱形主体12伸出到尖端18的齿。这多个尖端18a限定出尖端直径20。
本发明还包括在与圆柱形主体12相切的方向横过各个齿16而挤压各个齿16的步骤。在挤压步骤的过程中,主体直径和尖端直径14、20基本上可以保持。在挤压过程中,每一齿16在横向于单独齿16纵轴的方向塑性的和弹性的变形。对齿16的挤压增加了齿16的致密性。
本发明的方法也可以包括附加的步骤,例如径向地挤压多个齿16以及圆柱形主体12,如美国专利No.6,168,754所公开的那样,因此将其整体结合在本文中作为参考。
本发明还提供了用于施行挤压步骤的挤压设备32。挤压设备32包括用于接收以及成形粉末金属预制坯10的模具22。模具22可以用工具钢或者任何其它用于成形模具的适宜的材料制造。模具22包括顶表面34和底表面36。孔24在顶、底表面34,36之间延伸。模具22可以包括在顶、底表面34、36的一个或两个与孔24之间的过渡,例如圆角部分或者倒角44。
多个沟槽26从孔24径向向外延伸。多个沟槽26的每一个都是由一对齿形轮廓限定出的,例如齿形轮廓25、25a。齿形轮廓25、25a径向向内延伸预定的高度到孔24的中心。圆柱形主体12可以接收在孔24中而齿16可以逐一地接收在沟槽26中。在附图所示的本发明实施例中,沟槽26是螺旋形的。模具22接收外形为斜齿轮的预制坯10。但是,可以用具有接收正齿轮的直沟槽的模具实现本发明。
现在参考图2-4,多个沟槽26的每一个都包括在顶、底表面34,36之间限定的长度28。此外,每一个沟槽26限定出在孔24和外表面54之间延伸的深度46。深度46可以是沿着长度28基本上恒定。深度46大致对应于齿16的高度。多个表面54限定出对应于尖端直径20的直径。
各沟槽26还包括沿着长度28可变化的宽度30、42。例如,沟槽26包括具有第一宽度30的第一部分38和具有第二宽度42的第二部分40。宽度30可以大致对应于齿16的宽度。第二宽度42相对于孔24而言在切线方向上比第一宽度30更窄。
第二部分40可以限定出沙漏形部分50。沙漏部分50包括锥形收缩的或者倾斜的或者渐渐变窄的部分74,其中宽度30a渐渐变窄到宽度42。沙漏部分50还包括锥形扩张的或者倾斜的或者渐渐变宽的部分76,其中宽度42渐渐变宽到宽度30。宽度30和30a可以是相同的或者可以是不同的。沙漏部分50可以沿着长度28以均匀的间距在顶、底表面34、36之间布置。
顶表面34附近的孔24和沟槽26限定出用于接收预制坯10的具有轴线68的模具开口56。孔24和所述多个表面54是同轴的并且基本上垂直于顶表面34延伸,因此模具22是直壁模具。
现在参考图1,在操作中粉末金属预制坯10可以与冲头58可操作地相连。冲头58可以沿着轴线68轴向地和旋转地移动预制坯10。冲头58旋转地和轴向地迫使预制坯10通过位于顶表面34附近的衬垫60。衬垫60可以使预制坯10相对于模具22的模具开口56而言便于插入。衬垫60也可以包括与模具22的沟槽26对齐的沟槽62,从而接收和引导齿16的移动。衬垫60可以是由与粉末金属预制坯10比较相对较软的材料形成,从而减少预制坯10在未对准的情况下发生损害的可能性。
冲头58旋转地和轴向地迫使预制坯10通过模具22。支撑衬垫64可以位于底表面36附近,从而在预制坯10移动通过模具22的过程中支撑模具22。衬垫64可以包括与沟槽26对齐的沟槽66,从而接收和引导齿16的移动。
在预制坯10移动通过模具22的过程中,多个齿16的每一个都穿过各个沟槽26的狭窄部分42。沟槽26的狭窄部分42与由布置在沟槽26相对侧上的齿形轮廓25,25a限定出的宽度加宽区域相对应。齿16在沿着沙漏部分50的狭窄部分74移动的过程中渐渐被压缩和变形。齿16的最大压缩发生在第二部分40,其中齿16的宽度与第二宽度42相对应。第二部分40用于使齿16的材料横向位移,压缩方向相对于主体部分12成切线,从而实现齿16的致密化。
在沿着轴线68移动的过程中齿经过第二部分40之后,齿16就可以沿着沙漏部分50的加宽部分76切向向外地扩张,从而恢复在遇到第二部分40以前拥有的至少一些并且优选的是基本上所有的变形的弹性分量。沟槽26的加宽部分76与由布置在沟槽26相对侧上的齿形轮廓25,25a限定出的宽度变窄的区域相对应。
模具22可以结合在如图5所示的多阶段成形工具中。多个模具22、22A、22B、22C可以相对于绕着轴线68同心布置的模具开口56、56A、56B、56C轴向间隔地排列。模具开口56、56A、56B、56C可以为相同的总体外形而大小不同。例如,最小的模具开口56可以布置在一个轴向端70而最小的模具开口56c可以布置在第二轴向端72。
模具22、22A、22B、22C可以被以轴向间隔关系固定模具22、22A、22B、22C的分隔板64、64A、64B分隔开。在沿着轴线68移动的过程中,预制坯10可以被旋转以穿过各个模具22、22A、22B、22C。此外,在移动通过任何一个模具22、22A、22B、22C的过程中,圆柱形主体12的主体直径14和多个尖端18的尖端直径20可以保持。
显而易见,按照上述说明,可以进行本发明的许多改进和变化。因此应当理解,在所附权利要求的范围内,本发明可以以具体叙述以外的其它方式实现。本发明是由权利要求限定的。
Claims (17)
1.一种用于制造粉末金属制品的模具,包括:顶表面;与所述顶表面间隔开的底表面;具有一直径并且在所述顶表面和底表面之间延伸的孔;以及在所述顶表面和底表面之间从所述孔径向向外延伸的多个连续的螺旋沟槽,其中所述多个沟槽的每一个都具有一长度和沿着所述长度变化的一宽度。
2.如权利要求1的模具,其特征在于,各个所述沟槽沿着所述长度均限定出沙漏部分。
3.如权利要求2的模具,其特征在于,所述沙漏部分在所述顶表面和底表面之间均匀间隔地设置。
4.如权利要求1的模具,其特征在于,所述直径在所述顶表面和底表面之间基本上恒定。
5.一种用于制造粉末金属制品的方法,包括以下步骤:烧结具有多个齿的压实的粉末金属预制坯;迫使粉末金属预制坯轴向地移动通过多个模具,每一个模具具有模具齿形轮廓,所述模具齿形轮廓至少在预制坯轴向运动方向上的引导部分具有宽度加宽区域,并且接合预制坯的齿并使其致密化;使粉末金属预制坯移动,轴向地通过在所述多个模具之间延伸的衬垫,所述衬垫的齿形轮廓在所述多个模具的模具齿形轮廓之间延伸,所述多个模具的模具齿形轮廓形成了多个连续的螺旋沟槽。
6.如权利要求5的方法,包括:引导粉末金属预制坯与具有第一衬垫的第一模具接合,第一衬垫具有在预制坯的齿之间延伸的引导齿。
7.如权利要求6的方法,包括:沿着螺旋线形成第一模具的齿形轮廓。
8.如权利要求7的方法,包括:沿着螺旋线形成第一衬垫的引导齿。
9.如权利要求7的方法,包括:在轴向移动通过模具的过程中使预制坯齿的尖端直径基本上保持恒定。
10.如权利要求7的方法,包括:使预制坯离开宽度加宽的区域并且进入由所述齿形轮廓限定出的宽度变窄的区域中。
11.如权利要求7的方法,包括:提供多个轴向连续的衬垫和模具,模具的各个齿形轮廓用于使预制坯齿的致密性逐渐增大。
12.如权利要求11的方法,包括:沿着对应于预制坯齿结构的共同轴线,使所述多个模具的各齿形轮廓和所述衬垫的各引导齿对齐;并且形成所述多个模具的各连续变窄的齿形轮廓,从而实现预制坯齿的逐渐致密化。
13.一种用于制造粉末金属制品的模具,包括多个模具部分,每个模具部分具有:顶表面;与所述顶表面间隔开的底表面;具有一直径并且在所述顶表面和底表面之间延伸的孔;以及在所述顶表面和底表面之间从所述孔径向向外延伸的多个模具沟槽,其中所述多个模具沟槽的每一个都具有一长度和沿着所述长度变化的一宽度;以及设置在所述模具部分中的任意两个之间的衬垫,所述衬垫具有多个与相邻模具部分的所述模具沟槽连续对齐的衬垫沟槽。
14.如权利要求13的模具,其特征在于,每个所述模具沟槽沿着所述长度均限定出沙漏部分。
15.如权利要求14的模具,其特征在于,所述沙漏部分在每个所述模具的所述项表面和底表面之间均匀间隔地设置。
16.如权利要求13的模具,其特征在于,所述模具沟槽是螺旋形的。
17.如权利要求13的模具,其特征在于,所述直径在所述顶表面和底表面之间基本上恒定。
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US10/821,014 | 2004-04-08 | ||
US10/821,014 US7025929B2 (en) | 2004-04-08 | 2004-04-08 | Method and apparatus for densifying powder metal gears |
PCT/US2005/011465 WO2005099938A1 (en) | 2004-04-08 | 2005-04-05 | Method and apparatus for densifying powder gears |
Publications (2)
Publication Number | Publication Date |
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CN1953830A CN1953830A (zh) | 2007-04-25 |
CN1953830B true CN1953830B (zh) | 2011-01-12 |
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CN2005800157238A Active CN1953830B (zh) | 2004-04-08 | 2005-04-05 | 用于使粉末金属齿轮致密化的方法和设备 |
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US (2) | US7025929B2 (zh) |
EP (1) | EP1747077B1 (zh) |
JP (1) | JP4954059B2 (zh) |
KR (1) | KR20070007829A (zh) |
CN (1) | CN1953830B (zh) |
BR (1) | BRPI0509727B1 (zh) |
ES (1) | ES2828064T3 (zh) |
WO (1) | WO2005099938A1 (zh) |
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DE102005027137A1 (de) * | 2005-06-10 | 2006-12-14 | Gkn Sinter Metals Gmbh | Verzahnung aus Sintermaterial |
DE102005027049A1 (de) * | 2005-06-10 | 2006-12-14 | Gkn Sinter Metals Gmbh | Belastbare Verzahnung |
DE102005027144A1 (de) * | 2005-06-10 | 2006-12-14 | Gkn Sinter Metals Gmbh | Oberflächenverdichtung einer Verzahnung |
AT503037B1 (de) * | 2006-05-04 | 2007-07-15 | Miba Sinter Austria Gmbh | Verfahren zum herstellen eines zahnrades |
AT504081B1 (de) † | 2006-09-04 | 2008-11-15 | Miba Sinter Austria Gmbh | Verfahren zur oberflächenverdichtung eines sinterteils |
JP4881152B2 (ja) * | 2006-12-29 | 2012-02-22 | 大岡技研株式会社 | 歯車 |
AT9818U1 (de) * | 2007-04-04 | 2008-04-15 | Miba Sinter Austria Gmbh | Vorrichtung und verfahren zum kalibrieren eines sinterformteils |
AT509588B1 (de) * | 2010-06-10 | 2011-10-15 | Miba Sinter Austria Gmbh | Verdichtungswerkzeug |
AT515352B1 (de) * | 2014-01-28 | 2017-09-15 | Miba Sinter Austria Gmbh | Sinterbauteil |
AT516779B1 (de) * | 2015-01-23 | 2017-04-15 | Miba Sinter Austria Gmbh | Verfahren zur Herstellung einer Balligkeit auf einem Sinterbauteil |
DE102015108991A1 (de) * | 2015-06-08 | 2016-12-08 | Hoerbiger Antriebstechnik Holding Gmbh | Nabe, Schiebemuffe und Synchronisationsvorrichtung sowie Verfahren zur Herstellung einer Nabe und Verfahren zur Herstellung einer Schiebemuffe |
CN108480644A (zh) * | 2018-04-12 | 2018-09-04 | 金华市宇辰粉末冶金有限公司 | 一种粉末冶金斜齿轮的全自动专用生产设备及生产方法 |
US11707786B2 (en) * | 2020-04-17 | 2023-07-25 | PMG Indiana LLC | Apparatus and method for internal surface densification of powder metal articles |
AT525262B1 (de) * | 2021-12-13 | 2023-02-15 | Miba Sinter Austria Gmbh | Verfahren zum Pressen eines Grünlings |
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Also Published As
Publication number | Publication date |
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BRPI0509727B1 (pt) | 2014-08-19 |
ES2828064T3 (es) | 2021-05-25 |
EP1747077A1 (en) | 2007-01-31 |
US7578963B2 (en) | 2009-08-25 |
US7025929B2 (en) | 2006-04-11 |
US20050226759A1 (en) | 2005-10-13 |
US20060024189A1 (en) | 2006-02-02 |
WO2005099938A1 (en) | 2005-10-27 |
KR20070007829A (ko) | 2007-01-16 |
EP1747077B1 (en) | 2020-08-12 |
EP1747077A4 (en) | 2009-09-09 |
JP4954059B2 (ja) | 2012-06-13 |
BRPI0509727A (pt) | 2007-09-25 |
JP2007532774A (ja) | 2007-11-15 |
CN1953830A (zh) | 2007-04-25 |
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