CN107206652A - 用于注射成型***的喷嘴截止器 - Google Patents
用于注射成型***的喷嘴截止器 Download PDFInfo
- Publication number
- CN107206652A CN107206652A CN201580073110.3A CN201580073110A CN107206652A CN 107206652 A CN107206652 A CN 107206652A CN 201580073110 A CN201580073110 A CN 201580073110A CN 107206652 A CN107206652 A CN 107206652A
- Authority
- CN
- China
- Prior art keywords
- helical member
- nozzle
- charging basket
- mould
- extrusion
- 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.)
- Granted
Links
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- 238000001125 extrusion Methods 0.000 claims abstract description 85
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- 238000000034 method Methods 0.000 claims abstract description 32
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- 238000004891 communication Methods 0.000 claims abstract description 3
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- 239000007921 spray Substances 0.000 claims description 11
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- 238000002156 mixing Methods 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 6
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- 229910000831 Steel Inorganic materials 0.000 description 2
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
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- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C45/74—Heating or cooling of the injection unit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
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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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- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0003—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular electrical or magnetic properties, e.g. piezoelectric
- B29K2995/0008—Magnetic or paramagnetic
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- G—PHYSICS
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- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/40—Minimising material used in manufacturing processes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Power Engineering (AREA)
- Robotics (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
提供注射成型装置以及制造成型零件的方法。该装置可以包括料桶、包围料桶的端部并且限定与料桶内部流体连通的开口的喷嘴以及至少部分地位于料桶内部且相对于料桶可旋转的挤出螺旋件。挤出螺旋件可以包括螺旋件尖端。料桶和挤出螺旋件之间的相对轴向移动可以打开或关闭喷嘴的开口,以分别允许或阻止材料流过喷嘴的开口。该方法可以包括夹紧模具、打开喷嘴、旋转挤出螺旋件以将熔融材料泵送到模具中直到模具被充满、关闭喷嘴并且松开模具以释放成型零件。
Description
相关专利申请的交叉引用
该专利申请要求于2014年12月4日提交的题为“Extrude-to-Fill InjectionMolding and Extrusion Screw”的美国临时专利申请No.62/087,414、于2014年12月4日提交的题为“Nozzle Shut-off for Extrude-to-Fill Injection Molding System”的美国临时专利申请案No.62/087,449以及于2014年12月4日提交的题为“Control System forExtrude-to-Fill Injection Molding”的美国临时专利申请No.62/087,480根据35U.S.C.119(e)法案的权益,这些临时专利申请的每一个都以其整体通过引用并入本文。
技术领域
本公开涉及一种注射成型***。更具体地,本公开涉及一种包括喷嘴封闭装置的注射成型***。例如,注射成型***可以包括被构造成截止或关闭喷嘴的挤出螺旋件头部。
背景技术
传统注射成型***主要通过由螺旋件的旋转而动态产生的剪切热而熔化诸如塑料之类的材料。传统注射成型***其特色在于具有在塑料颗粒在那里进入***的料斗处拥有开口的料桶和在注射期间塑料在那里排出料桶的喷嘴。在料斗开口和喷嘴之间,螺旋件在塑料树脂上施加压力以产生剪切热,从而在成型周期的回收挤出阶段期间将塑料熔体引入注射区。该剪切发热***依赖于在喷嘴中形成冷塞(cold slug)以容纳每次喷射之间的塑料。该冷塞在喷射周期之后密封喷嘴并且在介于成型喷射之间的回收挤出阶段期间阻止额外的塑料通过喷嘴流出,从而在料桶中捕获塑料以便施加压力以产生剪切热。然而,冷塞需要移除非常高的压力以便允许熔融树脂在下一个注射周期期间通过喷嘴流出。被施加来移除冷塞的压力主要被螺旋件尖端和喷嘴之间的塑料体积所吸收。一旦冷塞被移除,高压力就将树脂熔体通过模具浇口(例如,模具空腔的入口)和用于将熔体输送到模具空腔中的流道或通道推入模具空腔中。传统注射成型***通常具有20,000至30,000psi的注射压力,以便在模具空腔中获得500-1500psi的压力。由于该高压力,传统注射成型***通常包括具有重或厚壁部分的料桶,其减小了从围绕料桶的带状加热器到塑料的热传导。冷塞是导致传统注射成型***的最大低效率之一。
可能涉及本公开的包括各种注射成型***的文献,包括美国专利No.7,906,048、美国专利No.7,172,333、美国专利No.2,734,226、美国专利No.4,154,536、美国专利No.6,059,556和美国专利No.7,291,297。然而,这些建议可能会被改进。
仍然存在开发可以为各种应用提供额外的灵活性的自动化和更有效的***来解决现有注射成型***的问题的需要。
发明内容
本公开通常提供注射成型***,其在本文中可以称为挤出-填充(ETF)式注射成型装置、机器或***。注射成型***通常包括喷嘴封闭装置。喷嘴封闭装置可以包括打开和关闭喷嘴的螺旋件尖端。通过使用螺旋件尖端来打开和关闭喷嘴,消除了传统注射成型***中的冷塞,这允许注射成型***在低注射压力下操作。低注射压力允许降低料桶厚度,这导致贡献熔化料桶中的材料所需的大部分热量的更有效的传导加热。
在一个实施例中,提供了一种挤出-填充式注射成型装置。该装置可以包括:挤出螺旋件,其位于料桶内部;喷嘴,其具有构造成包围螺旋件尖端的尖端部分、被构造成连接到料桶的料桶连接件以及位于尖端部分和料桶连接件之间的中间部分。喷嘴的尖端部分可以具有用于注射成型材料的开口。该装置可以包括联接到挤出螺旋件的螺旋件尖端。螺旋件尖端可以被构造成配合在喷嘴的尖端部分内部,以沿轴向方向在喷嘴内部移动来密封和打开喷嘴。该装置可以包括联接到料桶并被构造成将材料填充到料桶中的料斗以及放置在料桶外部的一个或多个加热器。
在一个实施例中,提供了一种用于通过挤出-填充式注射成型装置来制造塑料部件的方法,该挤出-填充式注射成型装置可以包括料斗、具有螺旋件尖端的挤出螺旋件、喷嘴、一个或多个加热器和马达。该方法可以包括夹紧模具并启动马达以旋转挤出螺旋件来将螺旋件尖端远离喷嘴移动以打开喷嘴。该方法可以包括旋转挤出螺旋件以将熔融材料泵送到模具中,直到模具被充满。该方法可以包括反转挤出螺旋件的旋转以移动螺旋件尖端来关闭喷嘴,并且冷却模具以使模具中的熔融材料固化。该方法可以包括松开模具以释放成型零件。
在一些实施例中,螺旋件尖端可以是与挤出螺旋件分离的部件。在一些实施例中,螺旋件尖端可以与挤出螺旋件一体化。
在一些实施例中,喷嘴可以是固定到料桶的部件。在一些实施例中,喷嘴可以集成到注射模具中并且在本文中被称为喷嘴***件。
在一个实施例中,提供了一种注射成型装置。该注射成型装置可以包括:料桶;喷嘴,其附接到料桶上并且限定与料桶内部流体连通的开口;以及挤出螺旋件,其至少部分地位于料桶内部且相对于料桶可旋转。该挤出螺旋件可以包括螺旋件尖端。料桶和挤出螺旋件之间的相对轴向移动可以打开或关闭喷嘴的开口,以分别允许或阻止材料流过喷嘴的开口。
在一个实施例中,提供了一种用于制造成型零件的方法。该方法可以包括:夹紧模具;通过将挤出螺旋件的尖端与在喷嘴中形成的开口分离来打开喷嘴;旋转挤出螺旋件以将熔融材料泵送到模具中,直到模具被充满;通过将挤出螺旋件的尖端定位成与喷嘴密封接合来关闭喷嘴;并且松开模具以释放成型零件。
另外的实施例和特征部分地在下面的描述中阐述,并且对于本领域技术人员来说,通过检查说明书将变得显而易见,或者可以通过所公开的主题的实践来学习。可以通过参考形成本公开的一部分的说明书和附图的其余部分来实现对本公开的性质和优点的进一步理解。
提供本公开以帮助理解,并且本领域技术人员将理解,本公开的各个方面和特征中的每一个在一些实例下可以优选单独使用,而在其他实例中也可以优选与本公开的其他方面和特征组合起来使用。因此,虽然根据实施例呈现本公开,但是应当理解,任何实施例的各个方面可以单独要求保护,以可以与该实施例或任何其他实施例的方面和特征组合起来要求保护。
附图说明
将参考以下附图和数据曲线图更全面地理解该描述,这些附图和数据曲线图被表示为本公开的各种实施例并且不应被解释为对本公开的范围的完整叙述,其这些附图和数据曲线图中:
图1是根据本公开的实施例的具有用于截止或关闭配合到模具中的喷嘴的螺旋件尖端的挤出-填充(ETF)式注射成型***的截面图;
图2是根据本公开的实施例的ETF注射成型***的螺旋件尖端的透视图;
图3A是根据本公开的实施例的喷嘴的前透视图;
图3B是图3A的喷嘴的前视图;
图3C是图3A的喷嘴的后透视图;
图4是根据本公开的实施例的截止或关闭图3A-3C的喷嘴的图2的螺旋件尖端的截面图;
图5是根据本公开的实施例的组装之前的喷嘴的透视图;
图6是具有图5喷嘴的图2的已组装螺旋件尖端的截面图;
图7A示出了根据本公开的实施例的处于关闭位置的喷嘴;
图7B示出了根据本公开的实施例的处于打开位置的图7A的喷嘴;以及
图8是图示根据本公开的实施例的使用ETF注射成型***来成型零件的步骤的流程图。
具体实施方式
可以参考结合下面描述的附图的以下详细描述理解本公开。注意,为了说明清楚的目的,各种附图中的某些要素可能不会按比例绘制。
本发明总体上提供了一种被构造成截止或关闭用于可以在本文中称为挤出-填充(ETF)式注射成型***的注射成型装置、机器或***的喷嘴的螺旋件尖端。因为不存在像传统注射成型***那样要以高压力来移除的冷塞,所以螺旋件尖端有助于ETF注射成型***的更有效的注射。该ETF注射成型***使用螺纹尖端在成型喷射之间密封喷嘴。可以通过将挤出螺旋件的尖端与在喷嘴中形成的开口分离来打开喷嘴,并且可以通过将挤出螺旋件的尖端定位成与喷嘴密封接合来关闭喷嘴。
注射成型***可以利用包括具有一几何形状的螺旋件尖端的螺旋件,该几何形状与喷嘴匹配,以使得当螺旋件尖端接合喷嘴时材料流动被禁止,而当螺旋件尖端与喷嘴脱离时材料自由流动。在一些实施例中,该螺旋件可以在其中螺旋件尖端与喷嘴脱离的打开位置和其中螺旋件尖端与喷嘴接合的关闭位置之间往复运动。螺旋件的旋转可以改变其轴向位置以打开和关闭喷嘴。换句话说,单气缸或马达可以移动螺旋件并使螺旋件尖端推进到与喷嘴接合和与喷嘴脱离接合,以分别阻止或允许材料流入由模具限定的空腔中。在一些实施例中,螺旋件是可旋转的,但是沿轴向方向固定。在这些实施例中,其中定位螺旋件的料桶可以沿在相对于螺旋件的轴向方向移动。喷嘴可以附接到料桶,以使得料桶朝向模具的运动将喷嘴抵靠模具浇口或入口密封,并且料桶的这种运动打开喷嘴并允许材料从料桶内流入模具空腔。料桶可以对喷嘴施加压力以密封喷嘴和模具浇口或入口之间的界面。在这些实施例中,马达可以附接到螺旋件上以旋转螺旋件,而气缸可以附接到料桶上以使料桶前后移动来使喷嘴移动到与模具浇口或入口接触和与模具浇口或入口脱离接触。
由于注射成型***因为在成型喷射之间不形成冷塞而使用低压力,所以ETF注射成型***便于使用静态热传导来熔化诸如塑料之类的材料,这允许较薄的料桶壁。通过使用静态热传导来熔化材料并且使用螺旋件尖端来密封喷嘴而没有在成型喷射之间形成任何冷塞,注射成型***可以在比传统注射成型***低得多的压力下间歇并按需地挤出。对材料流动的阻抗是材料粘度的函数,并且注射成型***的静态热传导确保了一致和受控的材料温度和粘度。在一些实施例中,注射成型***可以产生与模具空腔中的压力相同的压力或者比模具空腔中的压力稍高的注射压力,诸如高5-10%的注射压力。在一些模具应用中,注射成型***可能需要仅500psi至1500psi的注射压力来填充模具。温度和粘度一致性可能导致更均匀的成型零件密度以及更少的翘曲和零件变形后成型。通常,由于剪切发热导致的不均匀的温度和粘度以及去除冷塞的需要,在传统***中需要介于20,000至30,000psi之间的较高注射成型压力。这可能在成型零件中产生较高的密度变化和零件变形。传统***中的大压力差可能存在于在喷嘴附近和模具空腔内部的区域之间,从而可能生产出很不均匀性的零件。
图1是根据本公开的实施例的本文中称为ETF注射成型装置、机器或***的注射成型***的截面图,其具有螺旋件尖端102,该螺旋件尖端102可操作以截止或关闭配合到模具112中的喷嘴108。在图1中,螺旋件尖端102处于打开位置,以使材料流入由模具112限定的模具空腔中。在图1的打开位置中,螺旋件尖端102被放置成与喷嘴108间隔开,以允许可能在本文中称为树脂熔体的材料116流过形成在喷嘴108中的开口114。
在图1所示的例子中,喷嘴108形成为与模具112配合的喷嘴***件。在图1中,喷嘴108至少部分地被容纳在模具112的进口或入口中,并以密封接合方式与模具112接合。当喷嘴108完全被***由模具112限定的进口或入口时,喷嘴108可以包括邻接模具112的周向凸缘。该凸缘可以有助于喷嘴108和模具112之间的密封接合。仍然参考图1,开口114形成在喷嘴108中,并且提供用于将材料116从注射成型***的料桶106内注入由模具112限定的模具空腔中的通道。如图1所示,当螺旋件尖端102与喷嘴108间隔开时,树脂熔体116可以围绕螺旋件尖端102流动,通过喷嘴108的开口114并进入由模具112限定的模具空腔中。如下面进一步讨论的那样,树脂熔体116的流动可能由挤出螺旋件104的旋转引起。
继续参考图1,挤出螺旋件104可以定位在料桶106内。挤出螺旋件104可以包括螺旋件尖端102,其被构造或成形为匹配喷嘴108在开口114附近的几何形状。挤出螺旋件104被放置在料桶106内部并且可以在料桶106内沿两个方向(例如顺时针方向和逆时针方向)旋转。在一些实施例中,挤出螺旋件104可以沿轴线118轴向地朝向开口114移动并且沿轴向方向向后远离喷嘴108的开口114移动。如图1所示,料桶106的端部122可以配合在喷嘴108内。在所示的实施例中,加热器110附接到料桶106的外表面。在该实施例中,加热器110处于模具112外部。在一些实施例中,加热器可以延伸到料桶106的端部122并且可以配合在喷嘴108之内(见图6)。
如图1所示,螺旋件尖端102与喷嘴108间隔开距离喷嘴108的开口114的距离,该喷嘴108处于打开位置以允许材料116通过开口114流入由模具112限定的空腔中。所示的实施例的螺旋件尖端102包括倾斜的过渡部分以帮助材料流动。倾斜的过渡部分可以以相对于挤出螺旋件104的纵向轴线(诸如轴线118)的在图1中由箭头120所标识的角度α形成。该角度α可以依赖于模具应用而变化。在一些实施例中,该角度α可以介于15°和45°之间。较小的角度可以帮助材料116更好地流动,但是会增加螺旋件尖端102的倾斜部分的长度。优选地,该角度α可以介于20°和40°之间,更优选介于25°和35°之间。
螺旋件尖端102可以轴向地延伸到喷嘴108中并精确地配合在喷嘴108内以密封喷嘴108并关闭开口114,从而限制材料116流过开口114。在一些实施例中,螺旋件尖端102沿轴线118朝向开口114移动。螺旋件尖端102可以密封喷嘴108的开口114,以阻止额外的树脂熔体116进入模具112。螺旋件尖端102可以使通常在传统注射成型过程的回收挤出阶段之前形成冷塞的树脂熔体116移位。
作为螺旋件尖端的尺寸的示例,螺旋件尖端102可以从喷嘴移开一定距离,以允许材料流入模具112的模具空腔中。例如,该距离可以是约0.25英寸。开口可以与螺旋件根直径成比例。开口114的直径可以是0.25英寸,而挤出螺旋件104可以具有0.5英寸的内径124。料桶106可以具有0.75英寸的内径和1.0英寸的外径。尖端与轴向方向的角度α可以是大约30°。本领域技术人员将理解,喷嘴***件、料桶和螺旋件的尺寸和形状可能变化。
诸如气缸(未示出)的支撑件可以放置在挤出螺旋件104的与螺旋件尖端102所在的前端相对的后端。当注射周期开始时,支撑件可以从挤出螺旋件104的后端释放,以允许挤出螺旋件104向后移动。当挤出螺旋件104开始旋转时,螺旋件尖端102可以立即向后轴向移动以打开喷嘴108,使得树脂熔体116可以通过开口114被注入或泵送到模具112中。
当注射周期完成(例如模具112被充满)时,挤出螺旋件104反转其旋转以使螺旋件104轴向向前移动,直到螺旋件尖端102关闭或截止喷嘴108。可以在螺旋件反向期间致动支撑件或气缸以向前移动,以确保截止或密封喷嘴108。
除了用以打开或关闭喷嘴108的开口114的螺旋件尖端102相对于喷嘴108的轴向移动之外或作为用以打开或关闭喷嘴108的开口114的螺旋件尖端102相对于喷嘴108的轴向移动的替代,喷嘴108可以相对于螺旋件尖端102轴向移动以打开或关闭喷嘴108的开口114。在一些实施例中,料桶106附接到喷嘴108,并且料桶106可相对于螺旋件尖端102沿轴线118轴向移动,从而使喷嘴108相对于螺旋件尖端102移动。料桶102可以从关闭位置相对于螺旋件尖端102向前移动,使得喷嘴108远离螺旋件尖端102移动并打开喷嘴108的开口114以允许材料116流过开口114并进入由模具112限定的空腔中。料桶102可以从该打开位置相对于螺旋件尖端102向后移动,使得喷嘴108移动到与螺旋件尖端102接合并且关闭喷嘴108的开口114,以阻止材料116流过开口114。料桶106可以可操作地联接到一气缸,该气缸在打开和关闭位置之间移动料桶106并且在料桶106上施加压力以在料桶106处于打开位置时将喷嘴108密封在模具112上。该气缸可以使料桶106和喷嘴108在打开位置和关闭位置之间往复运动。在一些实施例中,螺旋件104是轴向固定的,并且当机料桶106处于打开位置时,螺旋件104在料桶106内旋转,以将材料116泵送通过喷嘴108的开口114进入由模具112限定的空腔。
在一些实施例中,螺旋件尖端102可以是与挤出螺旋件104分离的部件。图2是根据本公开的实施例的螺旋件尖端的透视图。如图所示,螺旋件尖端200包括与喷嘴108的开口114相匹配的螺旋件尖端部分202。螺旋件尖端部分202可以具有圆盘或任何形状(包括圆形、正方形、矩形和椭圆形等)的板的形式。螺旋件尖端200可以包括无螺纹圆柱形部分206。螺旋件尖端200可以包括将螺旋件尖端部分202连接到圆柱形部分206的倾斜过渡部分204。该倾斜过渡部分204可以具有介于15°和45°之间的角度β。较小的角度可能有助于材料更好地流动,但会增加尖端尺寸。优选地,角度β可以介于20°和40°之间,更优选介于25°和35°之间。
螺旋件尖端200可以以包括螺纹接合、销钉接合或卡扣配合接合等的各种方式附接到挤出螺旋件104。作为示例,螺旋件尖端200可以包括带螺纹圆柱形部分210,其具有与螺旋件104的靠近挤出螺旋件104的端部的内螺纹相匹配的外螺纹,使得螺旋件尖端200可以附接到挤出端螺丝104的端部。螺旋件尖端200可以包括介于无螺纹圆柱形部分206和带螺纹圆柱形部分210之间的中间凸缘部分208。该中间凸缘部分208可以从无螺纹圆柱形部分206和带螺纹圆柱形部分210径向延伸,以将螺旋件尖端200适当地定位到挤出螺旋件104上。
螺旋件尖端200可以被构造成如图3A-3C所示那样配合到喷嘴300中。图3A是根据本公开的实施例的喷嘴的前透视图。图3B是图3A的喷嘴的前视图。图3C是图3A的喷嘴的后透视图。喷嘴300可以包括具有开口302的喷嘴尖端部分306,其允许将材料注入模具中。开口302可以是如所示的圆形或任何其他形状。
喷嘴300可以以包括螺纹接合、销钉接合、卡扣配合接合等的各种方式附接到料桶(例如图4中的料桶402)。作为示例,喷嘴300可以包括带螺纹料桶部分304,其具有与料桶的靠近料桶端部的内螺纹相匹配的外螺纹,使得喷嘴300可以附接到料桶(例如在图4中的料桶402)的端部。喷嘴300可以包括连接尖端部分306和带螺纹料桶部分304并且位于尖端部分306和带螺纹料桶部分304之间的凸缘部分308。该凸缘部分308和尖端部分306可以被构造成配合到模具中。
图4是根据本公开的实施例的用于截止或关闭图3A-3C的喷嘴300的图2的螺旋件尖端200的截面图。图4示出了螺旋件尖端被放置在关闭喷嘴300的开口302的位置的情形。如图所示,螺旋件尖端200的一端通过将螺旋件尖端200的带螺纹圆柱形部分210的外螺纹紧固到螺旋件404的端部处的挤出螺旋件404的内螺纹410而附接到挤出螺旋件404。在所示的实施例中,螺旋件尖端200的中间凸缘部分208抵靠挤出螺旋件404的端部。
螺旋件尖端部分202可以被成形为与开口302的几何形状匹配,而螺旋件尖端200的过渡部分204可以被成形为匹配喷嘴尖端部分306的侧壁的内表面的几何形状,使得螺旋件尖端200可以密封喷嘴300的开口302。如图4所示,树脂熔体116被螺纹头200的顶端部分202和过渡部分204推离喷嘴300的开口302。
仍然参考图4,喷嘴300可以以各种方式附接到料桶402的端部。例如,喷嘴300可以通过将喷嘴300的螺纹部分304的外螺纹紧固到料桶402的靠近料桶402的端部的内螺纹406而附接到料桶402的端部。喷嘴300的凸缘部分308抵靠料桶402的端部。
如图4所示,在料桶402和挤出螺旋件404之间可能存在小间隙412。间隙412可能有助于挤出螺旋件404在料桶402内自由旋转。间隙412可以足够大以大大地或基本上阻止材料116在料桶402和挤出螺旋件404之间被剪切。
在一些实施例中,挤出螺旋件404可以旋转并向后移动一小轴向距离以打开喷嘴300。当挤出周期被由诸如塑料之类的材料或任何其他材料充满的模具112填充中断时,挤出螺旋件404可以反向旋转以向前移动该小轴向距离来关闭或截止喷嘴300。除了挤出螺旋件404的轴向移动之外或作为其代替,料桶402可以相对于螺旋件404向前移动一轴向距离以打开喷嘴300,并且可相对于螺旋件404向回或向后移动一轴向距离以关闭喷嘴300。
继续参考图4,带状加热器110(例如电加热器)可以被放置在料桶402外部以加热材料或树脂116。挤出螺旋件404可以在内部是中空的,使得电阻式加热器408或其他热源可以被放置在挤出螺旋件404内部以进一步加热树脂116。挤出螺旋件404可以由诸如黄铜之类的高传导材料形成,以增强热传导。
在一些实施例中,通过使用磁性料桶或磁性螺旋件,使得感应式热传导成为可能。可以使用感应式发热器来促进比电加热器更快的响应时间。例如,ETF注射***可以使用感应式发热器以及磁性料桶部分和/或磁性螺旋件来立即加热料桶和挤出螺旋件。在一些实施例中,料桶和/或挤出螺旋件可以包括至少一个磁性部分或部件,以进一步促进更快的响应时间。
ETF注射成型***与传统***相比,对材料纯度、材料清洁度、污染物,树脂等级或未知来源的敏感度较低。用于成型的材料可以包括任何非晶态热塑性塑料、结晶和半结晶热塑性塑料、原生树脂、纤维增强型塑料、再生热塑性塑料、后工业再生树脂、消费后再生树脂、混合与共混型热塑性树脂、有机树脂、有机食品化合物、碳水化合物基树脂、糖基化合物、明胶、丙二醇化合物、淀粉基化合物和金属注射成型(MIM)原料等。该材料可以具有颗粒、薄片或任何不规则形状的形式。例如,目前总是作为填埋场垃圾处理的混合与共混型热塑性废料可以用于ETF注射成型。
喷嘴配合在模具和用于注射成型的料桶之间。在一些实施例中,喷嘴可以是如图1所示的单个部件或零件。在一些实施例中,因为制造各个部件可能更容易,所以喷嘴可能是几个单独部件的组装零件。喷嘴可以由各种材料形成。在一些实施例中,喷嘴由金属形成。
图5是根据本公开的实施例的组装之前的喷嘴的透视图。可以集成到模具中并且在本文中被称为喷嘴***件的喷嘴500可以包括模具浇口504,其是用于将材料注入模具的进口。模具浇口504可以形成为具有比第二料桶部分512小的直径的第一料桶部分510的料桶形状。喷嘴500可以包括模具螺纹506,其可以在本文被称为模具***件。模具螺纹506可以包围模具浇口504并且可以附接到模具。
喷嘴500可以包括模芯或模芯组件502,其可以形成为具有不同内部和外部尺寸的各种部分的料桶或管状形状。模芯组件502可以包围模具浇口504并且可以定位在模具浇口504和模具螺纹506之间,如图6所示。
模芯组件502可以包括具有大于模具浇口504的外径的内径和小于模具螺纹506的内径的外径的第一端部514。如图6所示,模具螺纹506可以被放置在模具芯组件502的第一端部514的外部或周围。模具螺纹506可以被构造成附接到模具。如图6所示,模具浇口504可以被放置在模具芯组件502内部。
模具芯组件502可以包括具有较大外部尺寸或直径的第二端部520,使得当喷嘴500被放置在模具中时,第二端部520可以用作止动器。第二端部520可以被放置成抵靠用于成型的模具。
模芯组件502可以包括第一中间过渡部分516,其具有接近用以围绕模具浇口504的模具浇口504的第二料桶部分512的外径的内径。如图6所示,模具浇口504的第一料桶部分510可以定位在模芯组件502的第一端部514的内部,并且模具浇口504的第二料桶部分512可以定位在模芯组件502的第一中间过渡部分516的内部。当模具浇口504位于模具芯组件502的内部时,模具浇口504的第二料桶部分512可以抵靠模具芯组件502的第一端部514。如图6所示,当模芯组件502被***到模具线508中时,模具螺纹508可以围绕模芯组件502的第一端部514并且可以抵靠模芯组件502的第一中间过渡部分516。第一中间过渡部分516可以具有倾斜的外表面以形成从模具螺纹508到模具芯组件502的第二中间过渡部分518的平滑过渡。
在一些实施例中,螺旋件尖端102可以与挤出螺旋件104集成为单个部件。图6是图2的已组装螺旋件尖端和由该螺旋件尖端密封的图5的喷嘴500的截面图。在图6所示的实施例中,螺旋件尖端不是与挤出螺旋件604分离的部件,这与图4中的实施例不同。挤出螺旋件604可以是实心件,使得挤出螺旋件604在挤出螺旋件604内部不包含加热器,这是图4所示的实施例的替代实施例。
如图6所示,模具浇口504的第一料桶部分510可以被构造成将挤出螺旋件604的尖端部分608包围在料桶602内部。模具浇口504的第二料桶部分512可以具有比第一料桶部分510更大的尺寸以部分地包围挤出螺旋件604。
模芯组件502可以如图6所示那样将加热器606包围在料桶602外部,这一点与图1所示的实施例不同。模芯组件502的第二端部520可具有大于带状加热器606的内径,以包围带状加热器606。模芯组件502的第二中间过渡部分518可具有比模芯组件502的第一中间过渡部分516更大的内部尺寸或直径,以包围加热器602。
图7A示出了处于关闭位置700A的喷嘴708,在该位置上螺旋件尖端712关闭或截止喷嘴708。如前所述,为了关闭喷嘴708,挤出螺旋件702可以朝向喷嘴708向前移动。当螺旋件702向前移动时,螺旋件尖端712配合到喷嘴708的侧壁中,其密封熔融材料以免流入模具中并且还防止形成冷塞。作为替代,为了关闭喷嘴708,料桶710可以相对于螺旋件702向后移动,使得附接到料桶710的喷嘴708朝向螺旋件尖端712移动并接合螺旋件尖端712以密封熔融材料以免流过喷嘴708。
图7B示出处于打开位置700B的喷嘴708。如前所述,为了打开喷嘴708,挤出螺旋件702可以向后远离喷嘴708移动。当注射成型开始时,可以释放诸如在挤出螺旋件702后面的小气缸之类的支撑件(未示出)。当挤出螺旋件702最初旋转以将材料推进到料桶710内部时,螺旋件尖端712可以从喷嘴708向后移动一小段距离,从而打开喷嘴708。在喷嘴708处于打开位置700B的情况下,挤出螺旋件702在料桶710内旋转以将材料泵送到模具中,直到模具被充满。换句话说,喷射量不受像传统注射成型***中那样的固定冲程的限制。本ETF注射***可以连续挤出塑料以填充任何尺寸的模具空腔。
当模具空腔被充满时,可以反向螺旋件旋转以向前移动螺旋件702,来将螺旋件尖端712抵靠在喷嘴708上放置,这使料桶710和料桶710内的材料减压。同时,与螺旋件702相关联的气缸可以对挤出螺旋件702的背面施加压力,以确保螺旋件尖端712适当地安置在喷嘴708内部。作为替代,为了打开喷嘴708,料桶710可以相对于螺旋件702向前移动,使得喷嘴708远离螺旋件尖端712移动并脱离螺旋件尖端712,从而允许熔融材料从料桶710内部流过喷嘴708,并且进入抵靠喷嘴708放置的模具中。
为了通过使用ETF注射成型***来准备成型零件,可以移动挤出螺旋件和/或料桶以将喷嘴抵靠模具的浇口放置。可以用待成型材料填充料斗。该材料可以具有颗粒或薄片或任何不规则形状的形式。料斗可以用水或其他冷却剂冷却。一个或多个加热器可以被启动以在材料从料斗中填充到料桶中时熔化该材料。材料处于在料桶的内表面和挤出螺旋件的外表面之间,如图1和6所示。
图8是图示根据本公开的实施例的使用ETF注射成型***来成型零件的步骤的流程图。方法800可以包括在操作802中夹紧模具。可以在操作802中以各种方式实现夹紧,这些方式可以包括但不限于施加气动夹紧力(例如基于气压的致动***)、机械夹紧力(例如机械夹具)和/或电动夹紧力(例如基于伺服马达的致动***)。在使用气压的实施例中,气压可以依赖于模具的尺寸而变化。在一些实施例中,注射成型***可以产生与模具空腔中的压力相同的压力或者比模具空腔中的压力稍高的注射压力,例如高5-10%的注射压力。在一些实施例中,气压可以在90psi至110psi的范围内。模具可以由包括诸如铝或钢之类的金属的各种材料形成。由于在挤出时使用的低压力,可以将铝模具用于ETF注射成型***。对于传统注射成型***,由于挤出所需的高压力而通常使用钢模具。
方法800在操作806中以激活马达以旋转挤出螺旋件来打开喷嘴而继续。作为替代,如前所述,可以通过相对于螺旋件移动料桶来打开喷嘴。马达可以联接到挤出螺旋件的端部,以沿依赖于螺旋件设计而确定的顺时针方向或逆时针方向中的一个方向旋转挤出螺旋件。方法800可以包括在操作810中旋转挤出螺旋件以将熔融材料泵送到模具中。当模具被充满时,马达可以在操作814中反转螺旋件的旋转以使螺旋件尖端向前移动来关闭喷嘴。作为替代,如前所述,可以通过相对于螺旋件移动料桶来关闭喷嘴。在操作818中,熔融材料可能需要时间在模具中冷却。时间可能会有所不同,例如在几秒钟之内冷却。在冷却之后,在操作822中,模具可以被松开,使得可以释放零件。模具可以以各种方式松开,这些方式可以包括释放施加到模具的气压。
虽然已经描述了几个实施例,但本领域技术人员将认识到,在不脱离本发明的精神的情况下,可以使用各种改进、替代结构和等同物。另外,为了避免不必要地模糊本发明,没有描述许多众所周知的过程和元素。因此,上述描述不应被认为是限制本发明的范围。所公开的所有特征可以单独使用,也可以以各种相互组合方式使用。
本领域技术人员将理解,目前公开的实施例以示例而非限制的方式进行教导。因此,上述描述中所包含或附图中所示的内容应被解释为说明性的而不是限制性的。以下权利要求旨在涵盖本文所述的所有通用和特定特征以及本方法和***的范围的所有陈述,其作为语言可能被称为落入在其间。
Claims (29)
1.一种注射成型装置,包括:
料桶;
喷嘴,其包围所述料桶的端部并且限定与所述料桶的内部流体连通的开口;以及
挤出螺旋件,其至少部分地定位在所述料桶内部并且能相对于所述料桶旋转,所述挤出螺旋件包括螺旋件尖端,其中所述料桶与所述挤出螺旋件之间的相对轴向移动打开或关闭所述喷嘴的开口,以分别允许或阻止材料流过所述喷嘴的开口。
2.如权利要求1所述的装置,其中所述螺旋件尖端和所述挤出螺旋件形成为单个零件。
3.如权利要求1所述的装置,其中所述螺旋件尖端与所述挤出螺旋件独立地被形成并且被附接到所述挤出螺旋件的端部。
4.如权利要求1至3中任一项所述的装置,其中所述喷嘴被附接到所述料桶。
5.如权利要求1至4中任一项所述的装置,其中所述料桶可沿轴向方向在其中所述螺旋件尖端关闭所述喷嘴的开口的第一位置与其中所述螺旋件尖端与所述喷嘴的开口间隔开的第二位置之间移动。
6.如权利要求1至3中任一项所述的装置,其中所述喷嘴抵靠所述料桶的端部。
7.如权利要求1至4和6中任一项所述的装置,其中所述挤出螺旋件可沿轴向方向在其中所述螺旋件尖端关闭所述喷嘴的开口的第一位置与其中所述螺旋件尖端与所述喷嘴的开口间隔开的第二位置之间移动。
8.一种装置,包括:
挤出螺旋件,其位于料桶内部;
喷嘴,其具有被构造成包围所述螺旋件尖端的尖端部分、被构造成连接到所述料桶的料桶连接件以及位于所述尖端部分和所述料桶连接件之间的中间部分,所述喷嘴的所述尖端部分具有用于注射成型材料的开口;
螺旋件尖端,其联接到所述挤出螺旋件,所述螺旋件尖端被构造成配合在所述喷嘴的尖端部分内部,以沿轴向方向在所述喷嘴内部移动而密封和打开喷嘴;
料斗,其联接到所述料桶并被构造成将材料填充到所述料桶中;以及
一个或多个加热器,其被放置在所述料桶外部。
9.如权利要求8所述的装置,其中所述螺旋件尖端包括倾斜部分以从所述挤出螺旋件的较大直径过渡到所述喷嘴的所述尖端部分的较小开口。
10.如权利要求9所述的装置,其中所述倾斜部分相对于所述轴向方向的角度介于15°至45°之间,优选介于20°至40°之间,更优选介于25°至35°之间。
11.如权利要求8至10中任一项所述的装置,其中所述喷嘴的所述尖端部分的开口与所述挤出螺旋件的直径成比例,以允许所述材料容易地流入模具空腔。
12.如权利要求8至11中任一项所述的装置,其中所述喷嘴的所述料桶连接件包括螺纹,所述螺纹被构造成附接到所述料桶的靠近所述料桶端部的螺纹。
13.如权利要求8至12中任一项所述的装置,其中所述螺旋件尖端包括螺纹,所述螺纹被构造成附接到所述挤出螺旋件的靠近所述螺旋件端部的螺纹。
14.一种制造成型零件的方法,所述方法包括:
夹紧模具;
通过使挤出螺旋件的尖端与在喷嘴中形成的开口分离而打开所述喷嘴;
旋转所述挤出螺旋件以将熔融材料泵送到模具中,直到所述模具被充满;
通过将所述挤出螺旋件的尖端定位成与所述喷嘴密封接合来关闭所述喷嘴;和
松开模具以释放成型零件。
15.如权利要求14所述的方法,其中:
打开所述喷嘴包括相对于挤出螺旋件沿第一方向移动料桶,以使附接到所述料桶的喷嘴远离所述挤出螺旋件的尖端移动;并且
关闭所述喷嘴包括相对于挤出螺旋件沿与所述第一方向相反的第二方向移动所述料桶,以将所述喷嘴移动到与所述螺旋件尖端接合。
16.如权利要求14所述的方法,其中:
打开所述喷嘴包括旋转所述挤出螺旋件以使所述螺旋件尖端远离所述喷嘴移动;并且
关闭所述喷嘴包括使所述挤出螺旋件反向旋转以将所述螺旋件尖端移动到与所述喷嘴接触。
17.如权利要求14至16中任一项所述的方法,还包括加热料桶中的材料以在打开所述喷嘴之前形成所述熔融材料。
18.如权利要求17所述的方法,还包括:
用颗粒或薄片形式的所述材料来填充料斗;并且
在加热所述料桶内的所述材料之前冷却所述料斗。
19.如权利要求14至18中任一项所述的方法,还包括冷却所述模具以固化所述模具中的所述熔融材料。
20.如权利要求14至19中任一项所述的方法,其中用所述熔融材料充满的料桶中的注射压力基本上与由所述模具限定的模具空腔中的压力相同或高10%。
21.如权利要求14至20中任一项所述的方法,其中所述材料选自由非晶态热塑性塑料、结晶和半结晶热塑性塑料、原生树脂、纤维增强型塑料、再生热塑性塑料、后工业再生树脂、消费后再生树脂、混合与共混型热塑性树脂、有机树脂、有机食品化合物、碳水化合物基树脂、糖基化合物、明胶、丙二醇化合物、淀粉基化合物和金属注射成型(MIM)原料组成的组。
22.一种通过一装置制造塑料部件的方法,所述装置包括料斗、具有螺旋件尖端的挤出螺旋件、喷嘴、一个或多个加热器和马达,所述方法包括:
夹紧模具;
启动所述马达以旋转所述挤出螺丝而使所述螺旋件尖端远离所述喷嘴移动以打开所述喷嘴;
旋转所述挤出螺旋件以将熔融材料泵送到所述模具中,直到所述模具被充满;
使所述挤出螺旋件反转以移动所述螺旋件尖端而关闭所述喷嘴;
冷却所述模具以使所述模具中的所述熔融材料固化;和
松开所述模具以释放成型零件。
23.如权利要求22所述的方法,还包括:
移动所述挤出螺旋件以将所述喷嘴抵靠所述模具的浇口放置;并且
在夹紧之前启动所述一个或多个加热器以熔化从所述料斗中填充到料桶中的所述材料。
24.如权利要求22至23中任一项所述的方法,还包括:
用颗粒或薄片形式的材料填充料斗;并且
在启动一个或多个加热器的操作之前,用水冷却所述料斗。
25.如权利要求22至24中任一项所述的方法,夹紧所述模具的操作包括施加范围从90psi至110psi的气压。
26.如权利要求22至25中任一项所述的方法,松开所述模具的操作包括释放所述气压。
27.如权利要求22至26中任一项所述的方法,其中当所述喷嘴打开时,使所述螺旋件尖端远离所述喷嘴移动。
28.如权利要求22至27中任一项所述的方法,其中所述熔融材料处于与所述模具中的压力相同或高10%的压力下。
29.如权利要求22至28中任一项所述的方法,其中所述材料选自由非晶态热塑性塑料、结晶和半结晶热塑性塑料、原生树脂、纤维增强型塑料、再生热塑性塑料、后工业再生树脂、消费后再生树脂、混合与共混型热塑性树脂、有机树脂、有机食品化合物、碳水化合物基树脂、糖基化合物、明胶、丙二醇化合物、淀粉基化合物和金属注射成型(MIM)原料组成的组。
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CN114714570A (zh) * | 2022-03-29 | 2022-07-08 | 深圳宗汉曙光科技有限公司 | 一种用于注塑生产的工业机器人 |
CN114714570B (zh) * | 2022-03-29 | 2024-01-26 | 深圳宗汉曙光科技有限公司 | 一种用于注塑生产的工业机器人 |
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