CN106466903B - 用于塑料材料注射模制设备的注射器的喷嘴末端 - Google Patents
用于塑料材料注射模制设备的注射器的喷嘴末端 Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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Abstract
一种用于塑料材料注射模制设备的注射器(3)的喷嘴末端(10),包括内管状本体或尖端(11)和环形螺母(9)。尖端(11)包括由第一材料制成的径向内元件(12),以及布置成在终止于离径向内元件(12)的远端(15)一定距离处的径向内元件(12)的中间部分(16)处与径向内元件(12)接触的由第二材料制成的径向外元件(13)。环形螺母(9)完全覆盖径向外元件(13),使其与环境隔离。
Description
技术领域
本发明大体上涉及用于塑料材料注射模制设备的注射器。更具体而言,本发明关于由此制作的用于注射器的喷嘴末端(nozzle terminal),包括限定用于注射的塑料材料的流动通路的内管状本体或尖端,以及外部地且同轴地固定到尖端上的环形螺母。
背景技术
例如,此类喷嘴末端从文献US-5299928、US-6988883和WO-2006/123237获知。典型地,内管状本体或尖端由高导热性材料制成,而旨在在使用中与冷却的模具接触的外环形螺母由低导热材料制成,以便较少热损失。
确保尖端的高导热性的要求(关于其成分)限制了材料的选择,诸如铜和其合金,另一方面,这些材料可能具有对于摩损和在注射期间穿过其的塑料材料的化学制剂的低的抵抗力。
文献US-7182591也公开了上文限定类型的喷嘴尖端,其尖端由软钎焊到彼此上的两个轴向部分制成,两个轴向部分分别对应于尖端的近端和远端。两个部分由相同的高导热性材料制成,因此即使此构造也不能解决上文提到的技术问题。
文献EP-0755766A1、FR-3012992A1和US-2013/306686A1公开了没有环形螺母的喷嘴末端,且其中尖端由利用环形空隙获得的高抵抗材料制成的本体形成,由高导热材料制成的插入件布置在环形空隙中。
文献US-2009/148550描述了对应于权利要求1的特征前部分的喷嘴末端,其尖端包括由第一高抵抗材料(例如,钢)制成的径向内元件,以及由布置成与径向内元件的基本轴向部分接触(达到其远端)的由第二高导热材料(例如,铜)制成的径向外元件或夹套。尖端的径向内元件和外元件经由不同系统相互联接,但它们都不能确保相互稳定固定(轴向和角向),同时确保维护操作期间的容易的拆卸。此外,由高导热材料制成的夹套在尖端外侧部分地露出,且其在使用期间经历塑料材料的渗透和由模制期间生成的气体腐蚀的风险,这可在其整体上危害尖端的常规操作。
发明内容
本发明的目的在于提供对上述问题的有效且起作用的解决方案。该目的由于上文限定类型的喷嘴尖端而实现,其主要特征在于尖端的径向外元件布置在终止于离径向内元件的远端一定距离处且朝环形螺母露出的径向内元件的中间部分处。
根据第一有利的实施例,环形螺母为"贯通"类型,且其完全覆盖尖端的径向外元件,因此使其与环境隔离,且尖端的径向内元件的远端延伸直至所述环形螺母的对应远端。
由于该解决方案,尖端的径向外元件在使用期间相对于周围的腐蚀性环境得到有效防护和保护。
在一个变型中,环形螺母为"外"类型,即,其不会延伸直至尖端的远端。在此情况下,除源于使用期间模制件上的浇口残痕尺寸减小的优点外,关于模具浇口的密封限于仅两个元件:尖端和模具板。
由于模具浇口附近的更高的热引起的较低材料停滞和改善的热轮廓,两个实施例("贯通"或"外"环形螺母)允许获得关于塑料材料颜色变化的改善的主要功能优点。
尖端的径向外元件与径向内元件有利地机械联接。
由于该解决方案构想,尖端的径向外元件相对于塑料材料流且相对于模制期间生成的气体隔离,且因此其得到有效地保护,避免了尖端故障的风险。
此外,关于两个径向内和径向外元件中的各个,最适合的相应材料和其组合可随待模制的塑料材料的特征、模具类型和喷嘴末端的构造变化而选择。
为了提高导热效率,径向内元件、径向外元件和环形螺母之间的联接通过过盈来方便地获得,因此还减小了注射维护操作期间(例如,在环形螺母的除去之后)径向外元件与径向内元件断开的风险。
附图说明
现在将仅通过非限制性实例,参照附图来详细描述本发明,在附图中:
图1为例如设有具有分别是常规的和根据本发明的喷嘴末端的两个注射器的注射模制设备的示意图和局部竖直截面,
图2为常规喷嘴末端的局部视图,且处于更大的比例,
图3为类似于图2的视图,列举了根据本发明的喷嘴末端的第一实施例,
图4为类似于图3的视图,单独示出了图3的喷嘴的尖端-环形螺母组件,
图5和6示出了图4的两个放大细节,
图7为图4的尖端-环形螺母组件的分解透视图,且处于小的比例,以及
图8和9为类似于图3和4的视图,表示根据本发明的喷嘴末端的第二实施例。
具体实施方式
首先参看图1,塑料材料注射模制设备常规地包括热室1,在所示实例中,将在流体状态下注射的加压塑料材料经由两个注射器2,3(在此情况下为圆柱形针阀类型)供应至热室1。仍然常规地,各个注射器2,3均包括与热室1连通的喷嘴本体4,且借助于流体或电气促动器6控制的针阀5沿喷嘴本体4轴向移动。
针阀5的下端与喷嘴末端协作(将在下文中进一步描述)以打开或关闭塑料材料朝模具的注射通路("浇口(gate)")的流动。
注射器2设有常规喷嘴末端(即,根据现有技术),以n°7表示且在图2中进一步详细示出。它包括内管状本体8,其称为尖端且由高导热材料(通常是铜或其合金)制成的单件形成,以及中空元件9,其由较低导热性材料制成,称为环形螺母。环形螺母9在尖端8下方突出,以用于在其自由端处,在相关注射通路处与模具密封联接,通路为称为"贯通端环"的构造,即,其中环形螺母9在模具的图中突出。
在图1的右部上呈现的注射器3改为设有根据本发明的第一实施例的喷嘴末端,其总体上以10表示且在图3至7中进一步表示。甚至在此情况下,它也包括"贯通"类型且基本类似于根据现有技术的环形螺母的环形螺母9,以及以11表示的内管状本体或尖端,其改为由两个不同构件形成,即,分开以特定形式布置。第一构件在于由第一材料制成的径向内元件12,且第二元件在于由通常不同于第一材料的第二材料制成的径向外元件或夹套13。
径向内元件12具有插入和锁定在喷嘴4中的近端14,以及突出喷嘴4外且针阀5的下端与其协作的远端15。它从近端14到远端15向内变窄,远端15沿轴向延伸直至环形螺母9的相对应的端,该端以9a指出,相对于远端15基本齐平。
对应于近端14和远端15的径向内元件12的部分通常具有更大的厚度,而中间部分优选具有更小的厚度,且限定终止于离远端15一定距离处且朝环形螺母9露出的外环形外周凹口16。径向外元件13被收纳且停留在此凹口16中。将观察到的是,考虑到仅径向外元件13布置在朝环形螺母9露出的径向内元件12的中部时是需要的,因而此凹口16不是严格需要的。
因此,径向外元件13包绕且在外部同轴地包覆位于径向内元件12的近端14下方和径向内元件12的远端15上方的径向内元件12的基本中心部分。因此,尽管径向内元件12在注射期间与引入模具中的塑料材料流接触,但径向外元件13永不接触。这允许了获得具有不同材料的两个元件12和13,其可随将注射的塑料材料的特征、模具"浇口"的类型和喷嘴末端11的构造变化来选择和组合:为针阀类型(如所示实例中),或为自由或鱼雷流类型。
因此,抵抗由塑料材料造成的磨损和氧化所需的径向内元件12将由具有高机械抵抗性、高耐磨性和高耐化学制剂能力的第一材料制成。此第一材料可选自回火不锈钢,但具有非常低的导热性(16W/mK),或仍用回火不锈钢,具有更高耐磨性和更高的导热性(32W/mK),或用提供甚至更高的传导性(大约80W/mK)和包括49到51HRC之间的硬度的钨。
径向外元件13将改为以第二材料获得,第二材料可选自较宽范围:具有低导热性,诸如钛(4W/mK),或具有更高传导性,诸如钢(16-36W/mK)、钨(80W/mK)、铜和镍合金(60-140W/mK)、钼合金(诸如TZM(120W/mK))。然而,径向外元件13优选由高导热材料制成,该材料诸如是铜或铜和铍合金(120-300W/mK)、铝(260W/mK)、电解铜(300-390W/mK)和甚至石墨(60-400W/mK)。
如前文所述,第一材料和第二材料的选择和组合将随待注射的塑料材料的类型和注射"浇口"点的构造变化来作出。例如,关于塑料材料的特征,晶体材料通常显示出关于所谓"冷盖(cold cap)"的缺陷,即,在注射点下凝固,这有时妨碍模制,或需要升高温度来恢复操作。因此,晶体材料大体上需要尖端11的高温,且因此在其到达径向外元件13时,非常高传导性的材料是优选的。
相反,非晶塑料材料通常随尖端或浇口的构造的类型变化而不同地表现。例如,在具有阀的喷嘴的情况下,这些非晶材料需要高温来用于更好流动,且以便避免闪光(特别是在图中的直接注射的情况下),而在自由流动的情况下,尖端的温度必须低,以便避免关于"成线(stringinig)"(在模具在除去难以完全除去且可能在随后的注射循环期间保持卡在模具中的件时打开的情况下,保持在模制件与喷嘴之间的塑料线的形成)或从浇口"流下"(即,塑料材料滴下,这导致"浇口"附近的模制件上的外观缺陷,或甚至由于微滴冷却而因此阻塞浇口而防止模制)的问题。
半晶塑料材料大体上以中间方式表现。
喷嘴末端10的环形螺母9的构造也可影响模具浇口上的塑料材料的性能:例如,类似迄今描述的实例的情况中的图中的贯通端环主题,大体上可导致相对于下文所述的外环螺母("盲座(blind seat)")的更热的浇口,假定了后者中在模具上获得的浇口通常较冷。径向外元件13与径向内元件12直接部分地接触,且其相互联接由过盈和借助于例如图4-7中进一步详细示出的类型的机械固持这两者来获得。环形凹口16在内元件12的远端15侧上由径向环形套环17界定,且其在相对侧上具有用于径向外元件13的对应内腔19的接合的一个或更多个突出的浮凸18。很明显,齿18和腔19的布置可倒转。
不同于尖端11且与尖端11分开的环形螺母9通常使用低传导性材料且因此更绝缘的材料(诸如具有大约46-48HRC的硬度的钛或钢)来获得,环形螺母9同轴地固定到包绕且完全覆盖径向外元件13的尖端11上,以便使其相对于环境隔离,且保护其免受在塑料材料的注射期间形成的腐蚀气体。有利地,环形螺母9与径向内元件12至少部分地联接,且其至少部分地与尖端11的径向外元件13联接。作为优选,环形螺母9通过过盈与分别位于凹口17上游和下游的径向内元件12的部分联接,且作为优选,它还通过过盈与径向外元件13联接。
图8和9(等同于或类似于前文所述的那些的其部分将使用相同的参考标号指出)示出了根据本发明的喷嘴末端10的第二实施例,其中以9'指出的环形螺母为"外侧的"而不是"贯通"类型。在此情况下,环形螺母9'终止于径向内元件12的远端15之前,因此仅部分地覆盖后者,且其远端9'收纳在模具的板P的座S中。尖端11的径向内元件12的远端15延伸穿过模具的板P的孔H,其具有相对于"贯通"环形螺母的情况更小的直径,带有模制件上的浇口残痕将显著地更小,因此改善其外观质量的优点。此外,喷嘴末端10与模具的注射通路(浇口)之间的密封在此情况下也简化,在于其限于插入孔H中的径向内元件12的远端15。甚至在此情况下,如前述"贯通"环形螺母9的情况那样,外环形螺母9'与径向内元件12至少部分地联接,且其与径向外元件13至少部分地联接。
明显地,构造细节和实施例可相对于所述和所示内容宽泛地改变,而不脱离如所附权利要求限定的本发明的保护范围。
Claims (13)
1.一种用于塑料材料注射模制设备的注射器(3)的喷嘴末端(10),包括:
限定用于注射的塑料材料的流动通路的内管状本体或尖端(11),以及在外部且同轴地固定至所述尖端(11)的环形螺母(9;9'),
其中所述尖端(11)包括:
由第一材料制成且具有近端(14)和远端(15)的径向内元件(12),所述径向内元件限定形成至其外表面中的外周环形凹口,所述环形凹口具有终止于离所述径向内元件的相应近端和远端一定距离处的近端和远端,以及
布置成与所述径向内元件(12)接触的由第二材料制成的径向外元件(13),所述径向外元件被收纳在所述外周环形凹口中且与之机械地联接,使得所述径向外元件布置在所述径向内元件的中间部分处,所述中间部分终止于离所述径向内元件的所述远端和近端一定距离处且朝所述环形螺母露出,以及
其中所述环形螺母(9;9')不同于所述尖端(11),且所述尖端(11)的所述径向外元件(13)为不同于所述径向内元件(12)的元件,
其特征在于,所述环形凹口的远端由所述径向内元件的径向环形套环形成,并且所述环形凹口在其近端附近具有至少一个突出的浮凸用于接合所述径向外元件的对应内腔。
2.根据权利要求1所述的喷嘴末端,其特征在于,所述环形螺母(9)完全覆盖所述径向外元件(13),使其与环境隔离。
3.根据权利要求2所述的喷嘴末端,其特征在于,所述径向内元件(12)的所述远端(15)延伸直至所述环形螺母(9)的对应远端(9a)。
4.根据权利要求1所述的喷嘴末端,其特征在于,所述环形螺母(9')仅部分地覆盖所述径向外元件(13)。
5.根据权利要求1-4中的任一项所述的喷嘴末端,其特征在于,所述径向内元件(12)和所述径向外元件(13 )通过过盈来联接至彼此。
6.根据权利要求1-4中的任一项所述的喷嘴末端,其特征在于,所述环形螺母(9;9')通过过盈来联接至所述径向内元件(12)。
7.根据权利要求1-4中的任一项所述的喷嘴末端,其特征在于,所述环形螺母(9;9')通过过盈来联接至所述径向外元件(13)。
8.根据权利要求1-4中的任一项所述的喷嘴末端,其特征在于,所述第一材料具有高机械抵抗性、高耐磨性和高耐化学制剂能力。
9.根据权利要求8所述的喷嘴末端,其特征在于,所述第一材料选自回火不锈钢、非不锈钢和钨。
10.根据权利要求1-4中的任一项或所述的末端喷嘴,其特征在于,所述第二材料选自低或高导热材料。
11.根据权利要求9所述的喷嘴末端,其特征在于,所述第二材料选自钛、钢、铜、铜和铍的合金、铜和镍的合金、铝和石墨。
12.根据权利要求1-4中的任一项所述的喷嘴末端,其特征在于,所述环形螺母(9,9')与所述径向内元件(12)至少部分地联接。
13.根据权利要求1-4中的任一项所述的喷嘴末端,其特征在于,所述环形螺母(9;9')与所述径向外元件(13)至少部分地联接。
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