CN104010744B - 圆锥形金属管材的扭转强塑性加工方法 - Google Patents
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Abstract
本发明涉及强塑性加工方法,能够代替作为主要在子弹或导弹这样的投射体、飞机的头部中使用的圆锥形金属管材的加工方法的金属旋压工艺,是如下的加工方法:利用模具对材料施加基于扭转和压缩力的强塑性变形,从而使材料实现晶粒超细化、纳米化。本发明的强塑性加工方法的特征在于,在圆锥形金属管材的内侧安装与上述圆锥形金属管材的内侧形状匹配的冲头,在上述圆锥形金属管材的外侧安装与上述圆锥形金属管材的外侧形状匹配的模具,之后根据通过上述冲头和模具对上述圆锥形金属管材施加压缩和扭转而得到的剪断变形,使上述圆锥形金属管材的微细组织实现超微细晶粒化或纳米晶粒化。
Description
技术领域
本发明涉及对圆锥形金属管材施加扭转强塑性的方法,更具体地讲,涉及如下的强塑性加工方法:在实质上保持形状的同时,通过对圆锥形金属管材施加由压缩力和扭转形成的剪断应力而实现的剪断变形,使金属管材的微细组织实现超微细晶粒化或纳米晶粒化,从而能够提高材料的机械性质。
背景技术
圆锥形金属管材利用于子弹或导弹的头、航空、如汽车这样的运输机零部件产业及厨房、取暖器材这样的各种领域。以往,这样的圆锥形金属管材是通过金属旋压法来加工为规定的形状而使用的。
但是,金属旋压法是将材料的形状控制作为主要目的的金属成型技术,因此与控制微细组织这样的提高材料的物理性质的技术没有太大关系。进而,在金属旋压法中,由金属工具的强压力所致的变形集中于金属管材的表面,存在加工之后金属管材的内部与外部的物理性质差异较大的问题。
当金属材料受到塑性变形时,开始形成小边界角位错胞的结构,塑性变形量越大,越随着位错胞(dislocationcell)的亚晶粒的晶界角的增加而发生晶粒逐渐被细化的现象。在利用该现象,对材料施加大的变形而使晶粒实现超微细晶粒化或纳米晶粒化时,与变形前的金属材料相比,其机械性质(强度、硬度、耐磨损性及超塑性等)大大提高,因此越来越需要一种脱离以往的以形状成型为主的材料加工方法而用于制造超微细/纳米结晶材料的加工方法。
在这样的超微细/纳米晶粒形成中,不仅压缩、拉伸、剪断变形这样的对材料施加的塑性变形量很重要,而且以使工艺前后的材料的形状实质上相同的方式设计模具,以使能够进行可施加大量的变形量的反复工艺也非常重要。
目前为止,作为满足这种条件的强塑性加工方法,研发有如下工艺:等通道转角挤压工艺(ECAP:EqualChannelAngularPressing)、高压扭转工艺(HPT:High-Pressuretorsion)、累积轧合法(ARB:AccumulativeRollBonding)、等径角轧制工艺(ECAR:EqualChannelAngularRolling)等。
但是,还未研发出能够相应于圆锥形金属管材的形状而进行强塑性加工的方法,因此需要研发该方法。
发明内容
技术课题
本发明的课题在于,提供如下的强塑性加工方法:实质上维持圆锥形金属管材的形状而能够进行大变形加工,能够使微细组织实现超微细晶粒化或纳米晶粒化,从而能够大大提高圆锥形金属管材的机械性质。
解决课题的手段
作为解决上述课题的手段,本发明提供圆锥形金属管材的扭转强塑性加工方法,其特征在于,在圆锥形金属管材的内侧安装与上述圆锥形金属管材的内侧形状匹配的冲头,在上述圆锥形金属管材的外侧安装与上述圆锥形金属管材的外侧形状匹配的模具,之后根据通过上述冲头和模具对上述圆锥形金属管材一边施加压缩力一边施加扭转而得到的剪断变形,使圆锥形金属管材的微细组织实现超微细晶粒化或纳米晶粒化。
在本发明的实施例中,上述剪断变形可通过使上述冲头对模具加压之后使上述冲头旋转而得到。另外,可以通过相反地使模具加压旋转或使冲头和模具向彼此不同的方向(例如,冲头向顺时针方向,模具向逆时针方向)旋转的方法来施加扭转。
另外,在本发明的实施例中,能够通过调节上述冲头的压缩力或转速来控制上述剪断变形的量。如果,在旋转模具或使冲头和模具同时旋转的情况下,能够通过调节模具的转速或冲头和模具的转速来调节剪断变形的量。
另外,在本发明的实施例中,能够向上述圆锥形金属管材的中心部施加大的压缩力而使上述圆锥形金属管材的中心部的微细结构实现超微细晶粒化或纳米晶粒化。
另外,在本发明的实施例中,优选为,进行上述强塑性加工方法的工艺前后的圆锥形金属管材的形状实质上相同。由此,能够使用相同的冲头和模具而反复地施加变形,因此能够施加大量的变形量。
另外,在本发明的实施例中,在上述模具或冲头的一侧或两侧的内部具备发热体,从而能够控制工艺温度。由此,能够在适合金属管材的材质的工艺温度下进行加工或进行微细组织的控制,从而能够进一步提高加工的效率性。另外,上述发热体可以不设置于模具或冲头的内部,而是设置于模具或冲头的外部。
另外,在本发明的实施例中,上述冲头的顶点曲率可维持为比圆锥形金属管材的顶点曲率大。由此,能够将圆锥形金属管材的在高度方向上的厚度维持为一定厚度,由此防止应力的集中而防止圆锥形金属管材被破坏。
发明效果
根据本发明的强塑性加工方法,在维持圆锥形形状而不损失材料的情况下,能够对材料施加大的剪断变形和压缩变形,由此能够实现微细组织的超微细晶粒化或纳米晶粒化,能够显著提高材料的机械物理性质,从而能够提供可满足各种物理性质要求的圆锥形金属管材。
另外,在本发明的强塑性加工方法中,工艺前后的材料形状同为圆锥形,因此能够通过反复进行工艺来调节扭转变形和机械性质。
另外,在本发明的强塑性加工方法中,调节工艺进行中的冲头(或模具)的转速,由此可自由调节施加于材料的变形量,因此能够容易进行圆锥形金属管材的物理性质强化和微细组织的调节。
附图说明
图1是概略性地示出在本发明的强塑性加工方法中使用的冲头、模具及各个工艺步骤的图。
图2是在本发明的实施例中使用的模具、冲头及试片的剖面图。
图3的(a)是对强塑性加工前的圆锥形金属管材进行拍照的照片,图3的(b)是对进行本发明的实施例的强塑性加工后的圆锥形金属管材进行拍照的照片。
图4示出对进行本发明的实施例的强塑性加工前后的圆锥形金属管材的硬度进行检测的结果。
具体实施方式
图1是概略性地示出在本发明的强塑性加工方法中使用的冲头、模具及各个工艺步骤的图,图2是在本发明的实施例中使用的模具、冲头及试片的剖面图,图3的(a)是对强塑性加工前的圆锥形金属管材进行拍照的照片,图3的(b)是对进行本发明的实施例的强塑性加工后的圆锥形金属管材进行拍照的照片。
参照附图,对本发明的具体制造工艺进行叙述。首先,本发明的强塑性加工方法大体分为将圆锥形金属管材安装到模具的步骤(第一步骤)、利用模具和冲头进行加压的步骤(第二步骤)、对圆锥形金属管材施加扭转的步骤(第三步骤)。
如图1和图2所示,上述第一步骤是如下的步骤:将对应于圆锥形金属管材的内侧的形状而制造的冲头安装于圆锥形金属管材的内侧,将安装有冲头的圆锥形金属管材安装于模具的内部,该模具是对应于圆锥形金属管材的外侧形状而制造的,由此将圆锥形金属管材安装到模具。此时,上述冲头和模具的安装顺序可根据模具的设计状态而不同。即,也可以先将圆锥形金属管材安装到模具,然后将冲头配置于圆锥形金属管材的内侧。另外,在上述模具的内部具备通过电阻而发热的发热体,由此能够施加适合圆锥形金属管材的加工条件的热。
上述第二步骤是如下步骤:以对安装于模具的圆锥形金属管材进行冲压的方式施加规定的压缩力。此时,压缩力为不发生试片的滑动的压缩力,可考虑试片的最终厚度而选定。另外,关于向圆锥形金属管材施加压缩力的方式,除了如上所述的移动冲头而加压的方式以外,还可以使用固定冲头而移动模具或者使两者均移动的方式。
上述第三步骤是如下步骤:在对圆锥形金属管材维持一定的压缩力的状态下旋转冲头而对圆锥形金属管材施加扭转。如上所述,在完成扭转工艺时,解除压缩力,使试片脱离模具。
由此,在本发明的强塑性加工方法中,通过压缩力来对材料施加非常大的静水压,在成为圆锥形金属管材与冲头之间的边界面的摩擦非常大的紧贴状态的情况下施加扭转,从而能够在没有滑动的情况下,对圆锥形金属管材施加完整的剪断变形。并且,所施加的静水压和剪断变形使圆锥形金属管材的微细组织根据上述的机理而被细化,从而能够实现超微细晶粒化或纳米晶粒化。
另外,在进行本发明的强塑性加工工艺时,利用施加到圆锥形金属管材的压缩力和转速,能够将圆锥形金属管材的微细组织和机械性质调节为所希望的形态。
下面,基于本发明的优选实施例对本发明进行更详细的说明。
图2是在本发明的实施例中使用的圆锥形金属管材试片、模具及冲头的剖面图。试片的大小和材料可根据使用目的而变形为各种各样,并且对应于试片的形状制造模具和冲头。
在本发明的实施例中,调整曲率,以使相比于试片的顶点部分,冲头的顶点部分不够尖细(即,使冲头的顶点曲率大于试片的顶点曲率),这是为了防止在强塑性加工工艺过程中,应力集中在试片顶点部分,从而导致在试片的顶点部分发生破坏。
在本发明的实施例的强塑性加工工艺中,使用了如下试片:将由纯铜构成且加工为图2所示的形状的试片,在加工工艺之前在600℃下加热2小时,然后在加热炉中进行退火。强塑性加工是在常温下进行的,以施加80吨的加压力的状态下使冲头以1rpm的速度旋转1次的方法执行。
图3是对进行本发明的实施例的强塑性加工工艺前后的试片的样子进行拍照的照片。其中,图3的(a)是工艺前初始状态的试片,图3的(b)是进行强塑性工艺之后的试片的样子,由该图可知,强塑性加工工艺前后的两个试片的形状实质上相同。只是,因强压缩力的影响,试片的厚度从1.2mm在进行工艺之后稍微减小为0.96mm。另外,可利用压缩力和冲头转速而调节强塑性加工工艺之后的试片的厚度。
图4示出用于确认进行本发明的实施例的强塑性加工前后的材料的机械性质的差异而进行的硬度检测结果。
图中,“初始状态”是从完成热处理的初始状态的试片的外侧壁的边缘向中心轴方向检测的硬度值,如图4的(a)所示,“外侧”为在进行强塑性加工工艺之后的试片中以与“初始状态”相同的方式检测的硬度值,如图4的(b)所示,“内部”为从试片的剖面所检测的硬度值。此时,硬度的检测方向如图4的(a)、(b)所示,检测间隔为1mm。
从图4可知,强塑性加工工艺之后的试片的硬度值比初始状态的试片的平均维氏硬度(Hv)值53大大提高,经过1次强塑性加工工艺之后的最大硬度值上升到140。另外,试片的外部与内部的硬度之差并不大,由此可知试片整体被均匀地强化。
通过这样的硬度值均匀上升的现象可实现试片的强度、耐磨损性这样的机械性质的提高。因此,本发明的实施例的强塑性加工工艺在维持圆锥形金属管材的形状的状态下,通过简单的方法而能够显著提高其机械性质,因此可适当使用于子弹或导弹这样的要求高物理性质的零部件。
Claims (8)
1.一种圆锥形金属管材的扭转强塑性加工方法,其特征在于,
在圆锥形金属管材的内侧安装与上述圆锥形金属管材的内侧形状匹配的冲头,在上述圆锥形金属管材的外侧安装与上述圆锥形金属管材的外侧形状匹配的模具,之后根据通过上述冲头和模具对上述圆锥形金属管材施加压缩和扭转而得到的剪断变形,使上述圆锥形金属管材的微细组织实现超微细晶粒化或纳米晶粒化,
上述冲头的顶点曲率大于圆锥形金属管材的顶点曲率。
2.根据权利要求1所述的圆锥形金属管材的扭转强塑性加工方法,其特征在于,
上述剪断变形是通过使上述冲头对模具加压之后使上述冲头旋转而得到的。
3.根据权利要求2所述的圆锥形金属管材的扭转强塑性加工方法,其特征在于,
通过调节上述冲头的压缩力或转速来控制上述剪断变形的量。
4.根据权利要求1至3中的任意一项所述的圆锥形金属管材的扭转强塑性加工方法,其特征在于,
向上述圆锥形金属管材的中心部施加大的压缩力而使上述圆锥形金属管材的中心部的微细结构实现超微细晶粒化或纳米晶粒化。
5.根据权利要求1至3中的任意一项所述的圆锥形金属管材的扭转强塑性加工方法,其特征在于,
进行上述强塑性加工方法的工艺前后的圆锥形金属管材的形状除厚度之外实质上相同。
6.根据权利要求1至3中的任意一项所述的圆锥形金属管材的扭转强塑性加工方法,其特征在于,
在上述模具上具备发热体,从而能够控制工艺温度。
7.根据权利要求1至3中的任意一项所述的圆锥形金属管材的扭转强塑性加工方法,其特征在于,
在上述冲头上具备发热体,从而能够控制工艺温度。
8.根据权利要求1所述的圆锥形金属管材的扭转强塑性加工方法,其特征在于,
上述模具能够进行旋转,从而能够单独旋转或与冲头一起旋转。
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