CN106232466A - 用于履带驱动系统的具有延长的使用寿命的履带板 - Google Patents
用于履带驱动系统的具有延长的使用寿命的履带板 Download PDFInfo
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Abstract
一种用于履带驱动系统的履带板,该履带板包括板基部、附接至板基部的一个或更多个驱动凸耳以及附接至板基部的耐磨护板。板基部和驱动凸耳可以由诸如MECASTEEL 145的预硬型工程钢形成。耐磨护板可以由MECASTEEL 145或诸如Creusabro 8000的高级耐磨钢形成。驱动凸耳可以优选地通过焊接以可替换的方式附接至板基部。耐磨护板可以优选地通过诸如螺栓的紧固件以可替换的方式附接至板基部。
Description
相关申请的交叉引用
本申请依据35 U.S.C.119(e)要求于2013年5月7日提交的美国临时申请No.61/820,551的权益。
技术领域
本发明涉及用于履带的履带板。具体地,本发明涉及用于采掘电铲的履带板,然而本发明并不限于此特定应用。
背景技术
一些大型采掘机械——诸如挖掘机和铲车——装配有用于移动的履带。在由环状履带驱动的车辆—诸如露天开采铲车、挖掘机、推土机和坦克—中,履带包括一系列链节,所述链节通过销而链接在一起以形成环状铰接履带,每个履带通过位于支承辊的任一端部处的链轮而安装在支承棍上。这些履带允许机器沿着地面移动。
履带的各链节被称为“履带板”。履带板必定支承重物,并且受到高压力。另外,履带通常需要在恶劣条件——诸如多石的或岩石遍地的地面以及低温——下工作。
目前,用于诸如Bucyrus 495型采掘铲车的重型车辆的履带板由铸钢形成,该铸钢可以在需要的情况下被感应淬火。设备原制造商(OEM厂商)对这种履带板的预期寿命是大约28,000个服务小时。然而,本发明人已发现这种履带的实际平均寿命大约仅为10,000个服务小时。他们还发现这种部件的在结构方面的失效模式比所涉及的磨损方面的失效模式多。79英寸宽和3400磅重的每个履带板花费大约20,000美元。对于Bucyrus 495型采掘铲车,每侧各具有47个这样的履带板,总共则有94个履带板。这样为每个机器增加多达188万美元的总成本。在Mount-Wright矿工作的5辆铲车上的履带板的更换成本大约是5百万美元每年,或者每辆铲车每工作一小时大约200美元。
因此,在本领域中需要具有延长的使用寿命的履带板。
发明内容
本发明是用于履带驱动系统的履带板,该履带板包括板基部、附接至板基部的一个或更多个驱动凸耳、以及附接至板基部的耐磨护板。板基部和驱动凸耳可以由预硬型工程钢——诸如MECASTEEL145——形成。驱动凸耳可以优选地通过焊接而以可替换的方式附接至板基部。耐磨护板可以优选地通过诸如螺栓的紧固件以可替换的方式附接至板基部。耐磨护板可以由MECASTEEL 145或诸如Creusabro 8000的高级耐磨钢形成。
附图说明
图1描绘了一件可使用本发明的类型的采掘设备——特别是一种绳索式电铲——的示意图;
图2描述了包括环状履带的一段履带系统;
图3描述了本发明的履带板;
图4描述了在本发明的履带板上使用的驱动凸耳的示例;
图5描绘了在本发明的履带板上使用的耐磨护板的示例。
具体实施方式
图1描绘了一件可使用本发明的类型的采掘设备——特别是一种绳索式电铲——的示意图。铲车1由环状履带系统2驱动,环状履带系统2包括环状履带3。
图2描绘了一段履带系统2,包括环状履带3。环状履带3包括多个履带板4,所述多个履带板4通过铰链销5链接在一起。图3描绘了本发明的履带板4。履带板包括多个部件:板基部6、一个或更多个驱动凸耳7、和耐磨护板8。板基部6和耐磨护板8可以由单件形成。整个履带板4可以形成为单件。
板基部具有多个铰接凸缘5”,该铰接凸缘5”具有贯穿其切出的铰链销孔5’。板基部设计成使得每个板基部能够与其他板基部串联连接以形成完整的环状履带。一个履带板的铰接凸缘5”与紧接其后的履带板的互补的铰接凸缘5”配对并且铰链销5插入到铰链销孔5’中以形成这两个板之间的铰链接合。
履带板的驱动凸耳7通过环状履带系统2的驱动齿轮顺序地接合以推进车辆。驱动凸耳7可以相对于板基部6单独制造并且附接至板基部6。这允许凸耳7在凸耳已经变得过度磨损时独立于板基部6被替换,因此板基部可以被再利用,从而相对于单件式单元显著降低了成本。附接凸耳7的优选方法是通过焊接,但是也可以设想到任何其他形式的附接,例如仅通过螺栓或其他这样的紧固件。图4中示出了驱动凸耳7的示例。替代性地,驱动凸耳7和板基部6可以形成为单件。
履带板包括附接至履带板基部6的耐磨护板8。耐磨护板8可以在与驱动凸耳7所附接的表面相对的表面上附接至履带板基部6。与驱动凸耳7一样,耐磨护板8可以制造成单独部件并附接至板基部6。这同样允许耐磨护板在其过度磨损时被更换,板基部再次被重新利用。耐磨护板8可以通过任何形式的附接件附接至板基部6,但是优选的方法是通过螺栓或允许容易地移除和更换耐磨护板8的其他这种紧固件。也可以利用焊接,但是更换将更困难,并且大面积的焊接会改变耐磨护板8和板基部6的物理性能。图5中描绘了耐磨护板8。特别示出了孔8’,安装螺栓或其他这种五金件可以穿过孔8’以将耐磨护板8附接至板基部6。
板基部6和驱动凸耳7优选地由预硬型工程钢——诸如例如MECASTEEL 145(由Industeel美国有限责任公司使用的商标名)——形成。MECASTEEL 145是在预硬状态下交付的钢种。例如在大量钢部件(机器、液压系统和压裂泵等)的制造中,MECASTEEL145可以代替诸如AISI 4330的常规钢。MECASTEEL 145独特的化学性质和热处理过程能够使其具有遍及整个块体的非常一致的机械性能,即使对于最严规范来说也是如此。因此,该钢在机械加工之后不需要任何进一步的硬化,从而实现了极大的成本节约。
MECASTEEL 145是经预硬化、正火、淬火和双重回火后交货的。表1示出了按重量百分比计的化学分析结果。
表1
该钢具有以下机械性能(在交货状态下):
1)350HB-390HB的硬度;
2)大于等于1000MPa的屈服强度;
3)大于等于1103MPa的极限抗拉强度;
4)大于等于15%的伸长率;以及
5)大于等于35%的断面收缩率。
在本申请中,MECASTEEL 145的块体被加工以形成板基部6和任何单独的驱动凸耳7。此钢被预硬化并且其特性在机械加工之后不显著变化。不需要后续的硬化处理,并且履带板一经生成就可以投入使用。替代性地,履带板的部件(板基部6、驱动凸耳7和耐磨护板8)中的任意两者或全部三者可以由单件MECASTEEL 145加工而成。
耐磨护板可以由MECASTEEL 145或 8000(Industeel美国有限责任公司的已注册商标)形成。在极端应用中, 8000是在耐磨性与韧性(抗裂性)之间具有更好的平衡的高级耐磨钢, 8000的耐磨寿命比常规的500HB水淬钢的耐磨寿命高50%以上。 8000具有独特的化学成分,该化学成分与通过油淬火进行的专用热处理相结合。
8000在不同工业领域中成功地用作耐磨部件。8000在工作时的非常有效的加工硬化之后实现表面硬化。加工硬化通过称为形变诱导相变(TRIP效应)的冶金学现象实现。在TRIP钢中,初始的微观结构不是全马氏体。 8000材料的原始微观结构在供货状态中是马氏体、贝氏体和残余奥氏体(在8%至10%的范围内)的平衡混合物。这赋予 8000在使用中受到局部塑性变形时被加工硬化的能力。塑性变形因残余奥氏体转变成新的且非常硬的马氏体而诱发表面硬化现象,同时该材料在下层仍保持延展性。这使钢在使用时能够最有效地承受磨损和强冲击。
此钢还具有非常细且均匀分散的硬颗粒(主要是铬、钼和钛微碳化物),从而赋予这种材料非常高的耐磨性。 8000的这种细微观结构是其特定的化学成分与通过油淬火而受控制的冷却速率结合而导致的结果。这种微观结构不同于通常为全马氏体钢(常规的500HB水淬钢)所具有的粗针状层状结构。此外,微碳化物的这种细且均匀的分散性非常有助于通过在使用中改善滑动耐磨性而增进基体的强化。
除了其高耐磨性之外, 8000比现有的500HB耐磨钢更经得起处理(成型、机械加工等)。 8000的化学分析结果在表2中给出:
表2
碳(C) | 锰(Mn) | 镍(Ni) | 铬(Cr) | 钼(Mo) | 硫(S) |
≤0.28 | ≤1.6 | ≈0.40 | ≤1.6 | ≥0.20 | ≤0.002 |
本发明的具创造性的履带板4连同其MECASTEEL 145板基部6和驱动凸耳7以及其MECASTEEL 145或 8000耐磨护板8具有大约25,000个小时的估计使用寿命。这样为在Mount-Wright矿工作的5辆铲车上的履带板减少大约每年250万美元的更换成本。
因此,尽管在文中已描述了本发明的实施方式,但是本领域的技术人员将会认识到仍应包含在本发明构思的精神内的变型、改型和替代方案等意在被包括在如随附权利要求书中所表达的本发明的范围内。
Claims (18)
1.一种用于履带驱动系统的履带板,所述履带板包括:
板基部、附接至所述板基部的一个或更多个驱动凸耳、以及附接至所述板基部的耐磨护板。
2.根据权利要求1所述的履带板,其中,所述板基部和所述一个或更多个驱动凸耳由预硬型工程钢形成。
3.根据权利要求2所述的履带板,其中,所述预硬型工程钢具有以下按重量百分比计的成分:
其余基本上是铁。
4.根据权利要求3所述的履带板,其中,所述预硬型工程钢具有:
350HB至390HB的硬度、1000MPa以上的屈服强度、1103MPa以上的极限抗拉强度、15%以上的伸长率、以及35%以上的断面收缩率。
5.根据权利要求4所述的履带板,其中,所述预硬型工程钢是MECASTEEL 145。
6.根据权利要求4所述的履带板,其中,所述板基部和所述一个或更多个驱动凸耳由一块或更多块所述预硬型工程钢通过机械加工而形成。
7.根据权利要求1所述的履带板,其中,所述一个或更多个驱动凸耳以可替换的方式附接至所述板基部。
8.根据权利要求1所述的履带板,其中,所述一个或更多个驱动凸耳通过焊接附接至所述板基部。
9.根据权利要求1所述的履带板,其中,所述耐磨护板以可替换的方式附接至所述板基部。
10.根据权利要求1所述的履带板,其中,所述耐磨护板通过螺栓以可替换的方式附接至所述板基部。
11.根据权利要求1所述的履带板,其中,所述耐磨护板由高级耐磨钢形成。
12.根据权利要求11所述的履带板,其中,所述高级耐磨钢是具有包括马氏体、贝氏体和残余奥氏体的混合物的微观结构的TRIP钢,所述残余奥氏体在8%至10%的范围内。
13.根据权利要求12所述的履带板,其中,所述高级耐磨钢还包括非常细且均匀分散的硬颗粒,所述硬颗粒主要由铬、钼和钛的微碳化物形成,所述硬颗粒的均匀分散性赋予材料极高的耐磨性。
14.根据权利要求11所述的履带板,其中,所述高级耐磨钢具有以下按重量百分比计的成分:
其余基本上是铁。
15.根据权利要求14所述的履带板,其中,所述高级耐磨钢是Creusabro 8000。
16.根据权利要求1所述的履带板,其中,所述耐磨护板由MECASTEEL 145形成。
17.根据权利要求16所述的履带板,其中,所述板基部和所述耐磨护板由MECASTEEL145形成为单件。
18.根据权利求1所述的履带板,其中,所述板基部、所述一个或更多个驱动凸耳、以及所述耐磨护板由MECASTEEL 145形成为单件。
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