CN109695817B - 高压罐的制造方法 - Google Patents
高压罐的制造方法 Download PDFInfo
- Publication number
- CN109695817B CN109695817B CN201811214170.4A CN201811214170A CN109695817B CN 109695817 B CN109695817 B CN 109695817B CN 201811214170 A CN201811214170 A CN 201811214170A CN 109695817 B CN109695817 B CN 109695817B
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- China
- Prior art keywords
- tension
- winding
- reinforcing layer
- fiber bundle
- liner
- 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.)
- Expired - Fee Related
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Images
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Textile Engineering (AREA)
- Moulding By Coating Moulds (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
本发明提供一种在从一个加强层起利用纤维束形成下一层加强层时能够通过减少纤维束的取向的混乱来确保罐强度的高压罐的制造方法。在高压罐的制造方法中,各加强层(71~75)通过一边保持相对于各加强层设定的设定张力一边卷绕纤维束(7)而形成,并具有:卷绕起始工序,在多个加强层中的至少一个加强层(74)的形成的结束时,停止内衬(8)的旋转,在卷绕下一层加强层(75)时,一边相对于内衬重复地交替进行正转方向的旋转与反转方向的旋转,一边以比针对下一层加强层设定的设定张力(F2)低的张力卷绕纤维束来形成加强层的卷绕起始部分(75a);和正式卷绕工序,在卷绕起始工序后,通过以设定张力(F2)卷绕纤维束来形成加强层。
Description
技术领域
本发明涉及在具有收纳空间的罐内衬的外周面形成纤维强化树脂层的高压罐的制造方法。
背景技术
一般情况下,对于要求耐压性等机械特性与轻型性的耐压容器等产品,例如燃料电池车辆所使用的高压罐,在具有收纳气体等的收纳空间的罐内衬的外周面形成有纤维强化树脂层。例如,纤维强化树脂层的形成利用纤维缠绕法(filament windingmethod)。
作为这样的纤维缠绕法,例如专利文献1中公开了一种通过一边使罐内衬朝一个方向旋转一边将含浸了树脂的纤维束连续地卷绕于罐内衬的外周面来形成纤维强化树脂层的高压罐的制造方法。在该制造方法中,纤维强化树脂层由多个加强层构成,各加强层通过一边保持预先设定的设定张力一边卷绕纤维束来依次进行层叠。
专利文献1:日本特开2011-236974号公报
这里,例如在专利文献1所示的制造方法中,在一个加强层的形成结束时,停止内衬的旋转,降低纤维束的张力。然后,通过再次旋转内衬来按照相对于下一层加强层设定的设定张力卷绕纤维束,从而形成下一层加强层。
然而,在从用于形成下一层加强层而开始旋转内衬时起至形成下一层加强层的纤维束达到设定张力为止的期间,存在在纤维束产生卷紧的情况。从而存在因该卷紧而导致张力集中在纤维束的卷绕起始的位置、该位置的纤维束的取向混乱的情况。其结果是,存在该纤维束的取向混乱的部分成为起点而使得高压罐的强度降低的担忧。
发明内容
本发明是鉴于这样的点而完成的,提供一种在从一个加强层起利用纤维束形成下一层加强层时能够通过减少纤维束的取向的混乱来确保罐强度的高压罐的制造方法。
鉴于上述课题,发明者反复深入研究的结果是,考虑以下情况。具体而言,在从上一个加强层起卷绕下一层加强层时,上一个的加强层的纤维束以设定张力被卷绕,因而稳固地卷绕至其卷绕结束位置。因此,在用于形成下一层加强层而再次开始内衬的旋转之后,在纤维束的张力达到下一层加强层的设定张力位置的期间,考虑了卷绕的纤维束产生卷紧的情况。
而且,在此期间,在卷绕的纤维束的卷绕起始位置(一个位置)集中地承受(集中于一点承受)纤维束产生卷紧时施加的张力,认为在该位置纤维束的取向产生混乱。因此,认为重新设置从上一个加强层的卷绕结束位置起开始卷绕纤维束并使张力增加至设定张力为止的期间承受该卷紧所引起的张力的纤维束的卷绕区域即可。
本发明是鉴于这样的点而完成的,本发明所涉及的高压罐的制造方法通过一边使具有收纳空间的罐内衬绕上述罐内衬的轴心朝一个方向旋转,一边将含浸了树脂的纤维束卷绕于上述罐内衬的外周面,由此形成依次层叠有多个加强层的纤维强化树脂层,上述高压罐的制造方法的特征在于,上述高压罐的制造方法通过一边保持对于各加强层设定的设定张力一边卷绕上述纤维束来形成上述各加强层,上述高压罐的制造方法具有如下工序:卷绕起始工序,在上述多个加强层中的至少一个加强层的形成完毕时,停止上述罐内衬的旋转,在卷绕下一层加强层时,一边使上述罐内衬重复地交替进行朝上述一个方向的旋转和朝与上述一个方向相反的方向的旋转,一边以比针对上述下一层加强层设定的设定张力低的张力将上述纤维束卷缠于上述至少一个加强层,从而形成上述下一层加强层的卷绕起始部分;以及正式卷绕工序,在上述卷绕起始工序结束后,通过以上述设定张力卷绕上述纤维束来形成上述下一层加强层。
根据本发明,能够在形成下一层加强层之前,相对于罐内衬反复交替地进行朝一个方向(正转方向)的旋转和朝相反方向(反转方向)的旋转,并以比下一层加强层的设定张力低的张力卷绕纤维束,形成下一层加强层的卷绕起始部分。该卷绕起始部分相对于罐内衬进行正转方向的旋转之后再进行反转方向的旋转,因而能够在反转方向的旋转时将残存于正转方向的旋转时卷绕的状态的纤维束的张力降低。
这样的结果是,卷绕起始部分以比相对于下一层加强层设定的设定张力低的张力进行卷绕,因而在正式卷绕工序中,开始内衬的旋转而在纤维束达到设定张力之前的期间,即便在纤维束产生卷紧,因其而引起的张力也能够在卷绕起始部分分散。
由此,在从一个加强层起利用连续的纤维束形成下一层加强层时,能够减少卷紧所引起的纤维束的取向的混乱,能够抑制因该取向的混乱所引起的高压罐的强度降低。
附图说明
图1是在本实施方式所涉及的高压罐的制造方法中使用的制造装置的示意性的示意图。
图2是本实施方式的高压罐的制造方法中的形成加强层的流程图。
图3是用于对从某一加强层起形成下一层加强层时的卷绕起始工序进行说明的高压罐的示意性立体图。
图4是沿着图3的A-A线的向视方向的剖视图。
图5是用于对正式卷绕工序进行说明的高压罐的示意性立体图。
图6是用于对纤维束的张力的时间变化进行说明的图表。
图7是用于对内衬的旋转速度的时间变化进行说明的图表。
图8是实施例以及比较例所涉及的高压罐的纤维束的纤维取向率的图表。
图9是实施例以及比较例所涉及的高压罐的破裂压力的图表。
附图标记说明:
1…高压罐;7…纤维束;8…内衬;70…纤维强化树脂层;71~75…加强层;75a…卷绕起始部分;F1、F2…设定张力;P…正转方向;B…反转方向
具体实施方式
参照附图对以下的本发明的一个实施方式进行说明。
1.关于高压罐1的制造装置
图1是在本实施方式所涉及的高压罐1的制造方法中使用的制造装置10的示意性的示意图。制造装置10是纤维缠绕装置,具备纤维放卷部2、纤维引导部3、卷绕部4以及控制装置6,它们构成执行将纤维束7向罐内衬8(以下称为“内衬8”)进行卷绕的卷绕装置5。在本实施方式中,内衬8具备:主体81,其形成有收纳氢气体等高压气体的收纳空间;以及第一金属盖82和第二金属盖83,它们安装于主体81的两侧。
纤维放卷部2具备多个管筒21a~21d、多个输送辊22a~22d、捆扎辊23以及张力调节部24,具有对含浸了未固化的热固化树脂的纤维束7进行放卷的功能。管筒21a~21d是筒状部件,卷绕有纤维束7,由电动马达(未图示)驱动而进行旋转,从而对纤维束7进行放卷。
输送辊22a~22d设置为与各管筒21a~21d对应,将从管筒21a~21d放卷的纤维束7输送至捆扎辊23。捆扎辊23将从管筒21a~21d放卷的纤维束7拉齐,并放卷至作为张力施加装置的张力调节部24。
张力调节部24具备张力调节臂24a、缸体24b、张力调节辊24c以及空气压力调整装置24d,具有对卷绕于内衬8的纤维束7施加张力的功能。在张力调节臂24a的一端,以能够旋转的方式安装有张力调节辊24c,在张力调节辊24c以钩挂的方式卷绕有纤维束7。
张力调节臂24a为了使施加于纤维束7的张力一定而如图示箭头那样上下转动。缸体24b具备与张力调节臂24a连接的活塞24e,经由连接有压力传感器24f的配管24g与空气压力调整装置24d连通。
空气压力调整装置24d是对借助后述的控制装置6的控制而排出的空气压力进行调整的装置,例如是由压缩机与压力调整阀等(未图示)构成的一般的装置。张力调节部24通过活塞24e与空气压力调整装置24d的空气压力的增加或者减少对应的移动而使张力调节臂24a转动,从而调整纤维束7的张力。被调整了张力的纤维束7经由输送辊25a~25d被输送至纤维引导部3。
纤维引导部3具有将纤维束7拉齐并引导至内衬8的功能。纤维引导部3具有:纤维集合部33,其设置有第一引导辊31和第二引导辊32;以及纤维送出部35,其设置有第三引导辊34。
纤维集合部33能够如箭头所示那样朝向内衬8移动,纤维送出部35能够如箭头所示那样上下转动。纤维集合部33使用第一引导辊31以及第二引导辊32将纤维束7拉齐。纤维送出部35使用第三引导辊34将纤维束7输送至内衬8。
在本实施方式中,纤维束7从第一引导辊31侧进入,与第一引导辊31的上侧外周、第二引导辊32的下侧外周以及第三引导辊34的上侧外周分别接触而被引导至内衬8。此外,在第二引导辊32设置有张力测定部36,该张力测定部36对由卷绕于该第二引导辊32的纤维束7所作用的力进行测定,并根据该测定出的力来测定纤维束7的张力。
卷绕部4具有通过使内衬8旋转来向内衬8卷绕纤维束7的功能。内衬8能够借助移动装置(未图示)如箭头那样沿轴心CL方向往复移动,另外,能够绕长度方向的轴心CL旋转。卷绕部4具备使内衬8旋转的电动式旋转装置41、旋转棒42、支承棒43以及接触辊45。
旋转棒42的一端部固定于旋转装置41,另一端部固定于第一金属盖82。支承棒43经由第二金属盖83支承内衬8。若旋转装置41动作,则旋转棒42旋转,使内衬8绕其长度方向的轴心CL朝一个方向旋转,由此能够将纤维束7卷绕于内衬8。由此,连续的纤维束7例如组合环形卷绕及螺旋卷绕而卷绕于内衬8的外周面。
此外,在相对于内衬8卷绕纤维束7的位置设置有接触辊45,一边利用接触辊45按压纤维束7,一边将纤维束7卷绕于内衬8,由此能够使纤维束7的卷绕状态稳定。
控制装置6是控制卷绕装置5(纤维放卷部2、纤维引导部3以及卷绕部4)的运转以及停止的装置,控制装置6输出控制信号,从而对纤维引导部3的上述移动、旋转装置41的旋转方向以及旋转速度进行控制。
如上所述,控制装置6基于压力传感器24f的测定值对空气压力调整装置24d进行控制,由此对纤维束7的张力进行控制。具体而言,在本实施方式中,纤维束7的张力由张力测定部36测定,并对空气压力调整装置24d(所排出的空气压力)进行控制,以使得测定出的张力成为对纤维束7预先设定的设定张力(后述的设定张力F1、F2等)。
2.关于高压罐1的制造方法
以下,对本实施方式的高压罐1的制造方法进行说明。图2是本实施方式的高压罐1的制造方法中的加强层的形成的流程图。图3是用于对从加强层74起形成加强层75时的卷绕起始工序进行说明的高压罐1的示意性立体图。图4是沿着图3的A-A线的向视方向的剖视图。图5是用于对正式卷绕工序进行说明的高压罐1的示意性立体图。图6是用于对纤维束7的张力的时间变化进行说明的图,图7是用于对内衬8的旋转速度的时间变化进行说明的图。此外,在图3以及图5中,省略图1所示的卷绕部4的各结构。
在本实施方式中,一边使内衬8绕内衬8的轴心CL朝正转方向P(一个方向)旋转,一边将含浸了树脂的纤维束7连续地卷绕于内衬8的外周面,由此在内衬8的外周面形成纤维强化树脂层70。
在本实施方式中,含浸了树脂的纤维束7由连续的强化纤维构成,并在其含浸有未固化的热固性树脂。作为连续纤维,例如能够举出玻璃纤维、碳纤维、芳族聚酰胺纤维、氧化铝纤维、硼纤维、钢纤维、PBO纤维、天然纤维或高强度聚乙烯纤维等纤维。
另外,作为热固性树脂,能够举出环氧类树脂、以乙烯基酯树脂为代表的变性环氧树脂、酚醛树脂、密胺树脂、尿素树脂、不饱和聚酯树脂、醇酸树脂、聚氨基甲酸乙酯树脂、热固性聚酰亚胺树脂。
此外,在本实施方式中,作为含浸于纤维束的树脂,能够举出未固化的热固性树脂,但例如只要在向内衬8卷绕时能够将树脂加热至软化点(玻璃化温度)以上,含浸于纤维束的树脂也可以是热塑性树脂。作为热塑性树脂,能够举出聚酯系树脂、聚丙烯系树脂、尼龙系树脂(例如6-尼龙树脂或6,6-尼龙树脂)、聚酰胺系树脂、环氧类树脂、聚碳酸酯系树脂、聚酰胺系树脂、丙烯酸系树脂或ABS系树脂等。
纤维强化树脂层70由多个加强层71、72、…构成,通过卷绕连续的纤维束7而在内衬8的外周面依次层叠形成多个加强层71、72、…。此外,在图3以及图4中,作为其一个例子,示出构成纤维强化树脂层70的加强层71~74与下一层加强层75的卷绕起始部分75a。
各加强层71、72、…通过一边保持对各加强层71、72、…设定的设定张力,一边卷绕连续的纤维束7而形成。在本实施方式中,通过内衬8的旋转的开始,则开始各加强层71、72、…的形成,在纤维束7的张力到达规定的设定张力之后,一边保持该设定张力,一边卷绕纤维束7,通过内衬8的旋转的停止而结束加强层的形成。在下一层加强层72、73、…的形成时,再次使停止状态的内衬8开始旋转,以同样的方式卷绕纤维束7。
因此,各加强层71、72、…是指卷绕前处于停止状态的内衬8在向正转方向P开始旋转之后开始纤维束7的卷绕、并在下一层加强层的卷绕前停止内衬8的旋转、纤维束7的卷绕结束为止形成的层。此外,各加强层71、72、…通过环形卷绕或螺旋卷绕形成。
在图4中,各加强层71、72、…由通过含浸了树脂的纤维束7形成的一层构成,但它们也可以由多层构成。此外,在本实施方式中,对邻接的(即卷绕前后的)加强层设定的设定张力不同,设定张力F1大于设定张力F2,但也可以构成为设定张力F2大于设定张力F1,例如也可以构成为上述设定张力F1、F2相同。
在本实施方式中,在从某层加强层(第N层加强层)起形成下一层加强层(第N+1层加强层)时,按照图2所示的流程进行。此外,参照图3~6,作为该流程的一个例子,对从纤维束7通过环形卷绕而卷绕的加强层73起通过环形卷绕形成下一层加强层74的情况进行说明。
在本实施方式中,首先,如图2所示,在步骤S1中,形成第N层加强层(加强层74)。这里,如图6所示,在步骤S1中,以预先设定的设定张力F1(例如400N)将纤维束7卷绕于内衬8或第N-1层加强层,形成第N层加强层。此时,如图7所示,内衬8的旋转速度以设定的旋转速度V成为恒定,但例如也可以根据纤维束7的卷绕方式以及相对于内衬8的卷绕位置等而变化。
在步骤S2中,停止内衬8的旋转,结束第N层加强层的形成。具体而言,如图6以及图7所示,在时刻t1,配合内衬8的停止(具体而言,配合内衬8的旋转速度的减少),将纤维束7的张力从设定张力F1降低至张力fa(例如3N)。这里,张力fa是此后欲进行卷绕的纤维束7不产生松弛的程度的张力。在该状态下,例如,如图3以及图4所示,加强层74的形成结束。
此外,如上所述,纤维束7的张力的控制是通过控制装置6对张力调节部24的控制来进行的。内衬8的旋转的控制是通用控制装置6对旋转装置41的控制来进行。
在步骤S3中,使内衬8向正转方向P旋转至旋转角度θ1,在第N层加强层的表面卷绕成为第N+1层加强层的卷绕起始部分的一部分的纤维束7。优选步骤S3中的正转方向P的内衬8的规定的旋转角度θ1例如为15°~20°的范围。
在本实施方式中,在该步骤S3中,如图6以及图7所示,在时刻t1~时刻t2期间,若使内衬8向正转方向P旋转至旋转角度θ1,则卷绕时的纤维束7的张力从张力fa(例如,3N)到达张力fb(例如10N)。这里,步骤S3中的卷绕时的纤维束7的张力是比对于下一层加强层(第N+1层加强层)设定的设定张力F2低的张力。
此外,在步骤S3中,通过张力调节部24使纤维束7的张力与步骤S3中的纤维束7的卷绕配合(即,与内衬的正转方向的旋转配合),从张力fa增加至张力fb。除此之外,也可以以如下方式调整内衬8的旋转速度,即:通过张力调节部24使纤维束7的张力在步骤S3中的纤维束7的卷绕时保持为张力fa,并通过内衬8向正转方向P旋转时产生的张力的增加(该张力变动)使纤维束7的张力成为张力fb。除此之外,例如也可以利用张力调节部24在纤维束7的张力达到张力fb之后保持该张力fb来卷绕纤维束7。在任一情况下,只要该张力fa以及张力fb小于对于下一层加强层(第N+1层)设定的设定张力F2即可。
接下来,进入步骤S4,使内衬8向与正转方向P相反的方向(反转方向B)旋转至比正转方向P的旋转角度θ1小的旋转角度θ2。具体而言,如图6以及图7所示,在时刻t2~时刻t3期间,使内衬8向反转方向B旋转。此时,纤维束7的张力从张力fb(例如10N)减少至张力fa(例如3N)。
这里,优选反转方向B的旋转角度小于正转方向P的旋转角度,在步骤S3中内衬8在正转方向P上的旋转角度θ1为10°~90°的范围情况下,步骤S4中内衬8在反转方向B上的旋转角度θ2为5°~45°的范围。更优选旋转角度θ1为15°~20°,且旋转角度θ2为5°~7°。由此,能够适当地形成纤维束7的卷绕起始部分。此外,优选步骤S3以及S4中的内衬8的旋转速度为5~170rpm,更优选为5~20rpm的范围。
此外,在步骤S4中,利用张力调节部24使纤维束7的张力与内衬8的反转方向的旋转配合,从张力fb减少至张力fa。另外,除此之外,也能够像上述那样,利用张力调节部24将纤维束7的张力保持为张力fa,通过内衬8的旋转速度的调整,若在内衬8朝正转方向P旋转时张力因该变动而增加至张力fb,则在朝反转方向B旋转时使纤维束7的张力减少至张力fa。除此之外,例如,也可以利用张力调节部24在纤维束7的张力达到张力fa之后保持该张力fa来卷绕纤维束7。在任一情况下,只要该张力fa以及张力fb小于对于下一层加强层(第N+1层)设定的设定张力F2即可。
特别地,含浸于纤维束7的树脂比未固化的热固性树脂更具有粘性,因此在步骤S3中卷绕的纤维束7不会从高压罐1解卷。另外,通过接触辊45在内衬8反转时再次按压在步骤S3中卷绕的纤维束7(参照图1),因而能够更可靠地防止纤维束7从高压罐1解卷。
接下来,进入步骤S5,在反转次数A少于预先设定的设定次数a(例如3次)的情况下,返回步骤S3,重复步骤S3~步骤S5,直至反转次数A成为设定次数a(例如3回)。
具体而言,如图7所示,在时刻t3~t4以及t5~t6,以与时刻t1~t2的情况同样的方式使内衬8朝正转方向P旋转,在时刻t4~t5以及t6~t7,以与时刻t2~t3的情况同样的方式使内衬8朝反转方向B旋转。
这样,一边相对于内衬8重复地交替进行朝一个方向(正转方向P)的旋转和朝与一个方向相反的方向(反转方向B)的旋转,一边以比对第N+1层加强层设定的设定张力F2低的张力fb将纤维束7卷绕于第N层加强层,从而形成第N+1层加强层的卷绕起始部分。例如,在图3以及图4中,在加强层74上形成作为下一层加强层的加强层75的卷绕起始部分75a。此外,本发明中所说的“卷绕起始工序”相当于本实施方式中重复步骤S3~步骤S5的一系列的工序。
优选这样的卷绕起始部分的卷绕范围例如在与内衬8的轴心CL正交的剖面中为1/4周~1/2周的范围,即,绕轴心CL在90°~180°的范围卷绕。通过在这样的范围进行卷绕,能够减少后述的卷紧时的张力的集中。
接下来,进入步骤S6,开始正式卷绕工序。具体而言,以设定张力F2卷绕纤维束7,由此形成第N+1层加强层。例如,在图5中,在加强层74上形成作为下一层加强层的加强层75。
这里,如图3、图4以及图6所示,在步骤S6中,一边保持预先设定的设定张力F2(例如200N),一边将纤维束7卷绕于第N层加强层(例如加强层74),形成第N+1层加强层(例如加强层75)。
具体而言,在时刻t7,开始内衬8朝正转方向P的旋转,并且使对纤维束7施加的张力增加至设定张力F2。在时刻t8,在对纤维束7施加的张力达到设定张力F2之后,一边保持该张力一边卷绕纤维束7,由此形成第N+1层加强层(例如加强层75)(参照图5)。若纤维束7在规定的范围被卷绕,则停止内衬8的正转方向P的旋转,由此结束第N+1层加强层(例如加强层75)的形成。在形成全部加强层之后,加热加强层所含浸的热固性树脂,使之固化。
根据本实施方式,在形成第N+1层加强层(例如加强层75)之前,一边相对于内衬8重复地交替进行朝正转方向P的旋转与朝反转方向B的旋转,一边以比第N+1层加强层(例如加强层75)的设定张力F2低的张力fa卷绕纤维束7。由此,能够形成第N+1层加强层(例如加强层75)的卷绕起始部分(例如卷绕起始部分75a)。
在该卷绕起始部分中,内衬8进行正转方向P的旋转之后再进行反转方向B的旋转,因而能够在进行反转方向B的旋转时将残存于进行正转方向P的旋转时已卷绕好的状态的纤维束7的张力降低。
这样,在步骤S6的正式卷绕工序中,开始内衬8的旋转,在纤维束7达到设定张力F2之前的期间,即便在纤维束7产生卷紧,因此而引起的张力也不会集中,能够利用卷绕起始部分(例如卷绕起始部分75a)分散该张力。
其结果是,在从第N层加强层(例如加强层74)起通过连续的纤维束7形成第N+1层加强层(例如加强层75)时,能够减少卷紧所引起的纤维束7的混乱,能够抑制因纤维束7的混乱所导致的高压罐1的强度降低。
此外,在本实施方式中,图2所示的工序也可以对全部加强层进行实施,也可以选择性地在容易产生卷紧的加强层进行实施。
[实施例]
以下对本发明的实施例进行说明。
(实施例)
在实施例中,利用本实施方式所示的高压罐的制造方法制造了多个高压罐。具体而言,如上所述,在使内衬重复地交替进行正转方向以及反转方向的旋转而形成图3所示的卷绕起始部分之后,在内衬的外周面形成了加强层。纤维束使用碳纤维,树脂使用环氧树脂。正转方向的旋转与反转方向的旋转重复4次,张力fa为3N,张力fb为10N。其他张力为上述所例示的值。
(比较例)
以与实施例相同的方式制造了高压罐。与实施例的不同点在于:在比较例中不形成图3所示的卷绕起始部分来形成加强层。
<纤维取向率的测定>
切掉实施例以及比较例中所获得的多个加强层中的各加强层的卷绕起始位置的纤维强化树脂,对该纤维束的纤维取向率进行了测定。“纤维取向率”是指:相对于纤维束的取向的方向以20°交叉的角度切断时的纤维束的各强化纤维的剖面形状(椭圆形状)的纵横比进行测定,在500个强化纤维中该纵横比收纳于规定的范围内的比例。即,纤维取向率越低则意味着纤维束的取向越混乱。图8是表示实施例以及比较例中的纤维取向率的图表。
如图8所示,在实施例中,纤维束的纤维取向率稳定在90%以上,在比较例中,纤维束的纤维取向率的偏差较大。其结果是,与比较例相比,可以说实施例中纤维束的取向的混乱较少。
<高压罐的破裂压力的测定>
对实施例以及比较例的高压罐施加内压,进行了破裂压力的测定。图9是实施例以及比较例的高压罐的破裂压力的结果。如图9所示,与比较例相比,实施例的高压罐的破裂压力较高。综上所述,实施例的高压罐与比较例相比,可以说高压罐的破裂压力因纤维束的取向的混乱减少而增高。
以上,对本发明的一个实施方式进行了详述,但本发明并不限定于上述实施方式,在不脱离权利要求所记载的本发明的精神的范围内能够进行各种设计变更。
此外,在上述实施方式中,使用张力调节部对纤维束施加张力,但例如也可以代替张力调节部,而使用其他种类的张力施加装置。另外,在本实施方式中,在步骤S3中,以内衬朝正转方向的旋转开始,但例如也可以以内衬朝反转方向的旋转开始,并交替地进行正转方向的旋转与反转方向的旋转。
Claims (3)
1.一种高压罐的制造方法,其通过一边使具有收纳空间的罐内衬绕所述罐内衬的轴心朝一个方向旋转,一边将含浸了树脂的纤维束卷绕于所述罐内衬的外周面,由此形成依次层叠有多个加强层的纤维强化树脂层,
所述高压罐的制造方法的特征在于,
所述高压罐的制造方法通过一边保持对于各加强层的纤维束预先设定的设定张力一边卷绕所述纤维束来形成各所述加强层,
所述高压罐的制造方法具有如下工序:
卷绕起始工序,在所述多个加强层中的至少一个加强层的形成完毕时,停止所述罐内衬的旋转,在卷绕下一层加强层时,一边使所述罐内衬重复地交替进行朝所述一个方向的旋转和朝与所述一个方向相反的方向的旋转,一边以比针对所述下一层加强层设定的设定张力低的张力将所述纤维束卷缠于所述至少一个加强层,从而形成所述下一层加强层的卷绕起始部分;以及
正式卷绕工序,在所述卷绕起始工序结束后,通过以所述设定张力卷绕所述纤维束来形成所述下一层加强层。
2.根据权利要求1所述的高压罐的制造方法,其特征在于,
在所述卷绕起始工序中,各所述一个方向的旋转角度为15°~20°,各所述相反的方向的旋转角度为5°~7°。
3.根据权利要求1或2所述的高压罐的制造方法,其特征在于,
在所述卷绕起始工序中,所述卷绕起始部分的卷缠范围在与所述罐内衬的轴心正交的方向上为1/4周~1/2周的范围。
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