CN105848852B - 由型坯吹塑成型的塑料储箱 - Google Patents
由型坯吹塑成型的塑料储箱 Download PDFInfo
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Abstract
本发明涉及一种基于多层的型坯(18)来成型塑料储箱的焊接沟槽(5)的方法,该方法在由型坯吹塑成型以制造所述储箱的过程中进行,其特征在于,该方法在包括两个模具部分和一个模芯的吹塑模具中实施以下步骤,其中所述模具部分中的一个限定用于成型所述焊接沟槽(5)的空腔(31),所述空腔(31)具有面对所述模芯敞开的开口(25):在所述模芯上面对所述模具部分的空腔(31)的开口(25)设置推动件(21),该推动件能够处于相对于空腔(31)缩进的第一位置和占据所述空腔(31)的开口(25)的一部分的第二位置;将所述推动件(21)置于其第一位置上;对所述型坯(18)进行吹塑成型,以使其形成所述模具部分的形状;在所述型坯(18)向所述空腔(31)的内部流动期间,将所述推动件(21)推进到其第二位置上。
Description
技术领域
本发明涉及塑料材料制成的储箱、尤其是燃料储箱的制造。
背景技术
为了制造塑料材料制成的储箱,可以使用多层型坯(“paraisons”),尤其是在其内部包含例如由EVOH制成的阻隔层的多层型坯。所谓型坯为被引入模具中的片状或者管状的挤压成型件,并在该挤压成型件中产生超压,使其贴覆在模具上,以使其形成所期望的储箱形状。
为了将附接部件焊接到塑料储箱上,已知设置焊接沟槽(“goulottes desoudure”),即具有通常为平面的边缘的凸起的形状,该边缘能够被加热,以焊接到附接部件相对应的边缘上。附接部件可以是注入管、联管节、通风管,该例举名单是非限制性的。
焊接沟槽的成型是在型坯的吹气阶段实现的,并且需要构成型坯的材料显著的流动,以使得所述材料填充限定焊接沟槽的外部形状的特别的型腔。
在某些情况下,由于该流动,位于型坯内部的阻隔层在该型腔中迁移地相当深,并会相当靠近焊接沟槽的用于焊接的区域。该区域一般被限定在距离焊接平面数毫米的厚度上。
发明内容
本发明旨在提出一种在型坯的吹塑过程中成型焊接沟槽的新方法。
根据该方法,在包括两个模具部分和一个模芯的吹塑模具中实施以下步骤,所述模具部分中的一个限定用于成型焊接沟槽的空腔,所述空腔具有面对模芯敞开的开口:
-在模芯上面对所述模具部分的空腔的开口设置推动件,该推动件能够处于相对于空腔缩进的第一位置和占据空腔开口一部分的第二位置;
-将推动件置于其第一位置;
-对型坯进行吹塑成型,以使其形成模具部分的形状;
-在型坯向空腔内部流动期间,将推动件推进到其第二位置上。
借助于本发明,推动件在空腔开口中的存在限制了型坯的阻隔层向焊接沟槽的焊接区域迁移。
在一个优选的实施例中,还在模具部分上设置活动块件,以在推动件对面的一侧限定空腔,该活动块件能够处于第一位置和第二位置,空腔的体积在第二位置上比在第一位置上小,并且,在型坯向空腔内部流动期间,使活动块件处于其第二位置上。
实际地,更简单的是,将活动块件的运动设置为当活动块件处于其第一位置上时空腔的体积最大,而在活动块件处于其第二位置上时空腔的体积最小。
活动块件对已经在流入空腔中的材料的推动进一步加强了将阻隔层维持在远离焊接区域之处。
在本发明的一个具体的实施例中,活动块件的运动与推动件的运动同时进行。
可替代地,活动块件的运动在推动件的运动之后启动。
在本发明的一个具体的实施例中,推动件包括头部和台肩。
优选地,推动件的尺寸被设置为使得在第二位置上并在横向于推动件的运动的方向上在推动件的头部和型坯之间留出间隙。这样的间隙是通过例如遵循以下公式来获得的,在该公式中,A为在推动件运动方向上测量的推动件头部和模具部分之间的距离,B为在横向于推动件的运动的方向上测量的推动件的头部和模具部分之间的距离,C为在推动件的运动方向上测量的推动件的台肩和模具部分之间的距离:A=4/B,并且C≥6mm。
根据构造,距离C对应于型坯在推动件台肩处的厚度。
根据本发明,“塑料材料”指的是包括至少一种由合成树脂制成的聚合物的材料。
所有类型的塑料材料都可以是合适的。非常合适的塑料材料属于热塑性材料类。
“热塑性材料”指的是任何热塑性聚合物,其中包括热塑性弹性体及其混合物。“聚合物”指的是均聚物和共聚物(尤其是二元共聚物或三元共聚物)。非限制性地,这种共聚物的例子为:无规共聚物、序列共聚物、嵌段共聚物和接枝共聚物。
任何类型的熔化温度小于分解温度的热塑性聚合物或者共聚物都是合适的。具有涵盖至少10摄氏度的融化范围的合成热塑性材料是特别合适的。这种材料的例子为其分子质量具有多分散性的合成热塑性材料。
特别地,可以使用聚烯烃、热塑性聚酯、聚酮、聚酰胺,以及这些材料的共聚物。也可以使用聚合物或共聚物的混合物,甚至可以使用带有无机、有机和/或天然填充物的聚合材料混合物,其中所述填充物例如为但不限制于:碳、盐和其他无机衍生物、天然纤维或聚合纤维。还可以使用由包括上述聚合物或共聚物中至少一种的、由叠放的联结层构成的多层结构。
一种常用的聚合物为聚乙烯。使用高密度聚乙烯(PEHD)获得了良好的效果。优选地,储箱还包括燃料不能渗透的树脂的层,其中所述树脂例如为EVOH(部分水解的乙烯-醋酸乙烯共聚物)。可替代地或者可叠加地,为了使得储箱对于燃料是不可渗透的,储箱可以经受表面处理(氟化或者磺化)。
本发明的主题还在于由型坯吹塑成型的塑料材料制成的储箱,该储箱包括焊接沟槽,即从储箱外表面凸起的形状,该形状具有能够被焊接到附接部件的对应边缘上的边缘,所述焊接沟槽在储箱的内侧在轴向上终止于通过型坯和模制元件之间的接触而模制成型的形状。
根据本发明的某些可以单独或者组合地使用的有利但可选的特征:
-焊接沟槽在储箱的内侧在轴向上终止于呈环形的内凸边;
-焊接沟槽在储箱的外侧在轴向上终止于通过型坯和模制元件之间的接触而模制成型的形状;
-焊接沟槽在储箱的外侧在轴向上终止于呈环形的径向平表面;
-焊接沟槽包括相对于径向平表面缩进的呈环形的内凸边;
-焊接沟槽具有非回转形状,以具有更好的机械强度。
附图说明
通过阅读示例性地而绝非限制性地提供的附图,能够更好地理解本发明。在这些附图中:
图1为设有燃料注入管的燃料储箱的正视图;
图2为图1的储箱的部分II的剖视图,其示出了符合第一实施例的焊接沟槽;
图3为同一部分II的俯视透视图;
图4为沿着图3的平面III-III的剖视透视图;
图5为与图4类似的、沿着与平面III-III垂直的平面IV-IV的视图;
图6为与图2类似的、本发明的另一实施例的视图;
图7为与图6类似的、沿垂直的剖视平面的视图。
具体实施方式
现在参照图1,在该图中可见具有一般形状的储箱1。实际上,储箱的形状取决于车辆,但是在本发明的范围内,储箱的形状是不重要的,本发明适于任何形状的储箱。该储箱通过如已知地在吹气模具(未示出)内部对型坯吹气来制造。例如在EP 1110697A2中描述了一个这种制造的示例,该示例的内容通过引用被包含在本说明书中。
所述储箱是由带有至少一层EVOH(部分水解的乙烯-醋酸乙烯共聚物)的高密度聚乙烯(PEHD)制成的多层的储箱,该EVOH层保证了对于碳氢化合物的密封性,并被称为“阻隔层”。
储箱1包括燃料注入管3,其被用于连接车辆的注油孔(未示出)和储箱1。注入管3通过焊接与储箱1连接。为此,注入管至少在这两个被焊接的元件的接触区域中以与构成储箱的材料兼容的材料构成。
为了与注入管3焊接,储箱包括在图3至图5中可见的焊接沟槽5。
焊接沟槽5从储箱的外表面7上凸出,在这里,焊接沟槽的形状为整体上呈开口放大形状的回转凸起,并在轴向上终止于呈环形的径向平表面9。
平表面9为焊接表面,在通过吹气使型坯成型之后,燃料注入管3的端部被焊接到该平表面上,以密封且牢固的方式将所述燃料注入管3联结到储箱1上。
在图4中可见,除了平表面9之外,焊接沟槽5在储箱的外侧具有内凸边11,该内凸边像平表面9一样朝向储箱1的外部。内凸边11形成相对于平表面9缩进的直径更小的环形。该环是平的,并且平行于所述表面9。由于内凸边11的存在,沟槽5的内表面13终止于整体上呈开口放大的形状,该形状的截面呈阶梯状。平表面9和内凸边11的形状可以是任意的,只要这些形状允许使用焊接沟槽以将储箱连接到例如注入管3的外部附件上,但是根据本发明,如在下文中可见,这些形状来自于通过片材18(或者更一般地,型坯)和模制元件之间的接触而得到的模制。
在储箱的内侧,焊接沟槽在轴向上终止于类似第一内凸边11的第二内凸边14,即其构成相对于储箱的内表面8缩进的直径小的环形。内凸边14的形状可以是任意的,但是根据本发明,该形状来自于通过片材18(或者更一般地,型坯)和模制元件之间的接触成型的模制。
如在图5中可见,除了两个在直径两端相对的凹陷17(在图3和4可见)以外,焊接沟槽5的外部侧表面15是圆柱形的。
这些凹陷17用于紧固再加工工具,以在储箱模制之后在储箱上实施最后加工以及特别地如下文所述的沟槽5的穿孔。
此外,这些凹陷17防止焊接沟槽具有回转形状(即在围绕其轴线的整个旋转中都是不变化的),根据发明人所进行的测试,这使焊接沟槽具有更好的机械强度。
现在描述在一个具体的非限制性实施例中的符合本发明的方法。
如在EP 1110697A2中所述,由两个多层塑料材料片材18构成的型坯从挤压模中被挤出,并且下降到模具(未示出)中。
该模具包括互补的两个半部分(被称为壳或凹模或模具部分)和一个能够被插入到两个壳之间的中央模芯。
根据该已知方法,一旦型坯的两个片材从模芯的两侧下降到模具部分之间,两个模具部分的每一个都闭合在模芯上,以第一次闭合模具。然后在模芯和型坯的每个片材之间产生气体(通常为空气)的超压,以使得片材贴覆在模具部分的内壁上,并赋予片材形状。该步骤被称为吹气。在吹气的同时,使预先安装在模芯上并且由适当的活动结构承载的附件朝一个或另一个片材的方向推进,贴覆于该片材,并且被焊接在该片材上。该操作允许在储箱中插入各种附件(例如:通风阀门和管道),而不需要在储箱被模制之后将这些附件引入模具中。在该成型之后,各承载型坯的一个片材的两个模具部分与模芯分开,而模芯则从两个模具部分之间被取出。最后,两个模具部分彼此靠近以第二次闭合模具,这次使得两个片材通过其周边来接触,这些周边彼此焊接以使储箱成型。
在实施该已知方法的期间,在吹气步骤时实施本申请的发明主题。
根据储箱所期望的功能,可以要求在型坯的单一或两个片材18上成型焊接沟槽。这里仅对于在单一片材18上的单一焊接沟槽来描述本发明,但这绝非限制性的。
在图2中示出了分别位于挤压的型坯的片材18两侧的两个活动插件19和21,以下称为活动块件19和推动件21。推动件21由模芯(未示出;相对于图2,该模芯位于片材18的下方)承载,而活动块件19则由两个模具部分中的一个(未示出;相对于图2,承载活动块件19的模具部分位于片材18的上方)来承载。在活动块件19周围,壳还包括分为两个部分23A和23B的沟槽模23,其中所述两个部分能够在该示图的平面中在打开位置和如图2中可见的闭合位置之间移动,在所述打开位置上,这两个部分23A和23B每一个都与另一个相距足以使沟槽在其沟槽模23中成型之后脱模的距离。
沟槽模23与活动块件19一起限定用于成型焊接沟槽的空腔31。该空腔31具有面对模芯敞开的开口25。
推动件21包括头部21A和台肩21B。推动件位于空腔31的开口25的对面。该推动件能够处于相对于空腔31缩进的第一位置(在图2中可见)和在图2中以虚线示出的第二位置上,在该第二位置上,推动件占据空腔31的开口25的一部分。推动件21从第一位置到第二位置的运动由箭头27示出。
活动块件19本身也可以如箭头29所示在如图2所示的缩进位置和由虚线示出的突出位置之间移动。
由此,活动块件19能够处于第一位置和第二位置,在第一位置上,空腔31的体积最大,而在第二位置上,空腔31的体积最小。
在称为突出位置的第二位置上,活动块件19压在型坯的塑料材料上,并在模具的模具部分侧通过模制赋予其由虚线限定的最终形状。
在称为缩进位置的第一位置上,当型坯的材料在模具模芯侧受到推力、尤其是在型坯的吹气步骤时的超压的作用下,活动块件19就让型坯的材料在空腔31中前进。
为了实施本发明,在储箱成型方法的吹气步骤时实施以下步骤。
在该阶段中,由两个片材18组成的型坯被挤出,每个片材18都被插入到模芯和模具的两个模具部分中的每个之间。模具闭合在模芯上。
将推动件19和活动块件21置于它们的第一位置上。沟槽模23在图2的位置上闭合。
然后,在每个片材18和模芯之间注入受压空气,以使得每个片材都形成模具部分的形状,该片材也由此贴覆于该模具部分。该吹气导致片材18的塑料材料向着空腔31和在该空腔内部的流动。因此,在模芯侧,片材18形成凹形18A。
当片材18的材料向着空腔31内部流动时,使推动件21推进到其由虚线示出的第二位置。推动件的头部21A进入到空腔31中,而台肩21B则顶靠在片材18上。因此,如由虚线示出地,片材18形成对应于模芯侧的形状。特别地,推动件21起到对于片材的模制元件的作用,并形成对应于未来的内凸边14的平面30。
在第二时间,将活动块件19布置在其由虚线示出第二位置上,其中所述第二时间是根据吹气的操作条件(这些操作条件尤其是由型坯的厚度、吹气的时间长度和压强、存在的元件的温度限定)来确定的。
由此,片材18形成相应的形状,即具有上文参照图4所述的呈环形的径向平表面9和对应于未来的内凸边11的内平面12。换句话说,活动块件19起到对于片材18的模制元件的作用。
一旦推动件21和活动块件19两者都到达它们的第二位置,推动件和活动块件均保持不动,直至吹气步骤结束。根据储箱的模制的各个参数,本发明可以在整个吹气步骤中进行(在该情况下,本发明与注入受压空气同时开始,并且在停止吹气压强时结束),或者可以仅在吹气步骤的一个部分期间进行(例如,本发明可以在注入空气之后开始和/或在停止吹气压强之前结束)。
在片材18冷却到足以允许储箱脱模之后,模具的两个模具部分分离,沟槽模23打开,储箱被脱模。
然后,通过再加工操作,对储箱的壁在其介于平面12和平面30之间的整个厚度上进行穿孔,以切割沟槽的内表面13并限定内凸边11和14。为此,使用穿孔工具,该工具被紧固在沟槽5的凹陷17上。
在图6和图7的实施例中,使用推动件21’,该推动件的头部21’A比上述的推动件21的头部21A更小。因此,推动件21’在片材18和头部21’A之间留出侧向间隙,该侧向间隙能够在焊接沟槽成型时更好地控制材料的流动。
考虑到在推动件的运动方向上测量的推动件头部21’A和模具部分之间的距离A,在横向于推动件运动的方向上测量的推动件头部21’A和模具部分之间的距离B,以及在推动件运动方向上测量的推动件台肩21’B和模具部分之间的距离C,观察到比值A/B小于4,并且C的数值小于6mm。
发明人在根据本发明制造的储箱上实施的测量显示出,多层型坯的阻隔层距离表面9足够地远,使得该表面9之后与附接部件(例如:注入管)的焊接不会损坏该阻隔层。该阻隔层在储箱壁中的合适的位置来自于在吹气步骤时,推动件19的作用,并被活动块件21的作用加强。
另外,对于包括纯料和回收材料(例如来自于废弃料的回收)的多层型坯,多层型坯的层的分布保持相当地均匀,而如果没有推动件19的作用,就可以观察到,焊接沟槽中会趋于缺乏纯料,而出现过多的回收材料。
本发明不限制于所示出的实施例,其他实施例对于本领域的技术人员来说显而易见。
Claims (9)
1.一种基于多层的型坯(18)来成型塑料储箱(1)的焊接沟槽(5)的方法,该方法在由型坯吹塑成型以制造所述储箱的过程中进行,其特征在于,该方法在包括两个模具部分和一个模芯的吹塑模具中实施以下步骤,其中所述模具部分中的一个限定用于成型所述焊接沟槽(5)的空腔(31),所述空腔(31)具有面对所述模芯敞开的开口(25):
-在所述模芯上面对所述模具部分的空腔(31)的开口(25)设置推动件(21),该推动件能够处于相对于空腔(31)缩进的第一位置和占据所述空腔(31)的开口(25)的一部分的第二位置;
-将所述推动件(21)置于其第一位置上;
-对所述型坯(18)进行吹塑成型,以使其形成所述模具部分的形状;
-在所述型坯(18)向所述空腔(31)的内部流动期间,将所述推动件(21)推进到其第二位置上。
2.如权利要求1所述的方法,其中,还在所述模具部分上设置活动块件(19),以在所述推动件(21)对面的一侧限定所述空腔(31),该活动块件(19)能够处于第一位置和第二位置,所述空腔(31)的体积在所述活动块件(19)的第二位置上比在所述活动块件(19)的第一位置上小;在所述型坯(18)向所述空腔(31)的内部流动期间,使所述活动块件(19)处于其第二位置上。
3.如权利要求2所述的方法,其中,所述活动块件(19)的运动与所述推动件(21)的运动同时进行。
4.如权利要求2所述的方法,其中,所述活动块件(19)的运动在所述推动件(21)的运动之后启动。
5.由型坯(18)吹塑成型的塑料储箱(1),所述储箱包括焊接沟槽(5),即从该储箱外表面(7)凸起的形状,所述形状具有能够被焊接到附接部件(3)的对应边缘上的边缘(9),所述焊接沟槽(5)在所述储箱(1)的内侧在轴向上终止于通过所述型坯(18)和模制元件(21)之间的接触而模制成型的形状(14),并且所述焊接沟槽(5)在所述储箱的外侧在轴向上终止于通过所述型坯(18)和模制元件(19)之间的接触而模制成型的形状(9、11)。
6.如权利要求5所述的储箱,其中,所述焊接沟槽(5)在所述储箱(1)的内侧在轴向上终止于呈环形的内凸边(14)。
7.如权利要求5所述的储箱,其中,所述焊接沟槽(5)在所述储箱(1)的外侧在轴向上终止于呈环形的径向平表面(9)。
8.如权利要求7所述的储箱,其中,所述焊接沟槽(5)包括相对于所述径向平表面(9)缩进的呈环形的内凸边(11)。
9.如权利要求5所述的储箱,其中,所述焊接沟槽(5)具有非回转形状,以具有更好的机械强度。
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FR1363620A FR3015921B1 (fr) | 2013-12-27 | 2013-12-27 | Procede de formation d'une goulotte de soudure sur une paraison pendant le soufflage d'un reservoir |
FR1363620 | 2013-12-27 | ||
PCT/FR2014/053559 WO2015097421A1 (fr) | 2013-12-27 | 2014-12-26 | Procédé de formation d'une goulotte de soudure sur une paraison pendant le soufflage d'un réservoir |
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CN105848852A CN105848852A (zh) | 2016-08-10 |
CN105848852B true CN105848852B (zh) | 2018-07-20 |
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CN (1) | CN105848852B (zh) |
FR (1) | FR3015921B1 (zh) |
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CN1935554A (zh) * | 2005-09-21 | 2007-03-28 | 八千代工业株式会社 | 具有阻挡材料层的容器的构造 |
US7600652B1 (en) * | 2000-06-29 | 2009-10-13 | Ti Group Automotive Systems, L.L.C. | Multiple layer polymeric cap and method of making the same |
CN102066086A (zh) * | 2008-06-23 | 2011-05-18 | 因勒纪汽车系统研究公司 | 用于制造燃料储箱的方法 |
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US6338420B1 (en) * | 1999-06-08 | 2002-01-15 | Delphi Technologies, Inc. | Motor vehicle fuel tank and method |
BE1013191A3 (fr) | 1999-12-22 | 2001-10-02 | Solvay | Procede de fabrication de corps creux en matiere plastique. |
DE10214900A1 (de) * | 2002-04-04 | 2004-04-29 | Delphi Technologies, Inc., Troy | Kraftstoffbehälter für Kraftfahrzeuge sowie Verfahren zur Herstellung desselben |
DE102008027823B3 (de) | 2008-06-11 | 2010-02-11 | Kautex Textron Gmbh & Co. Kg | Verfahren zur Herstellung eines Kraftstoffbehälters für Kfz sowie Kraftstoffbehälter für Kfz |
US20100072200A1 (en) * | 2008-09-19 | 2010-03-25 | Gm Global Technology Operations, Inc. | Internally Mounted Fuel Tank Inlet Check Valve |
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2013
- 2013-12-27 FR FR1363620A patent/FR3015921B1/fr not_active Expired - Fee Related
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2014
- 2014-12-26 EP EP14833522.7A patent/EP3089857B1/fr active Active
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US7600652B1 (en) * | 2000-06-29 | 2009-10-13 | Ti Group Automotive Systems, L.L.C. | Multiple layer polymeric cap and method of making the same |
CN1935554A (zh) * | 2005-09-21 | 2007-03-28 | 八千代工业株式会社 | 具有阻挡材料层的容器的构造 |
CN102066086A (zh) * | 2008-06-23 | 2011-05-18 | 因勒纪汽车系统研究公司 | 用于制造燃料储箱的方法 |
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US11305644B2 (en) | 2022-04-19 |
WO2015097421A1 (fr) | 2015-07-02 |
FR3015921B1 (fr) | 2016-01-01 |
FR3015921A1 (fr) | 2015-07-03 |
EP3089857A1 (fr) | 2016-11-09 |
US20160318390A1 (en) | 2016-11-03 |
KR20160103043A (ko) | 2016-08-31 |
EP3089857B1 (fr) | 2020-08-26 |
CN105848852A (zh) | 2016-08-10 |
US10471823B2 (en) | 2019-11-12 |
US20200023730A1 (en) | 2020-01-23 |
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