CN105365182A - 用于注塑机的塑化单元 - Google Patents
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Abstract
本发明涉及一种用于注塑机的塑化单元(1),该塑化单元具有可移动且可转动地设置在轴向延伸的塑化缸体的缸体孔中的塑化螺杆(4),在塑化缸体的注射嘴和塑化螺杆(4)的螺杆顶端之间设有螺杆前室(3),其中,多个超声波转换器(5)设置在塑化缸体的壁(2)的不同轴向位置上,并且设有分析单元(8),该分析单元设计成用于由超声波转换器(5)的信号制作在螺杆前室(3)中的轴向温度曲线。本发明还涉及一种用于在使用至少一个超声波转换器(5)的情况下制作在注塑机的塑化单元(1)的螺杆前室(3)中的温度曲线的方法。
Description
技术领域
本发明涉及一种具有权利要求1的前序部分的特征的用于注塑机的塑化单元和一种具有权利要求7的前序部分的特征的方法。
背景技术
由申请人的AT512647B1已知一种用于确定在同类型的塑化单元的塑化缸体中的径向温度曲线的方法。该方法使用测量超声波信号运行时间的原理。
此外已知:
——使用接触式温度计,所述接触式温度计与塑化缸体的壁以壁锁合的方式使用。为了装配接触式温度计而在塑化缸体的壁上需要传感器孔。由于高压力而对温度传感器产生高的机械应力。与此相应,此类的传感器可被非常稳定地设计。这种结实的包覆导致非常长的响应时间,这又使得动态调节在配给时变得困难或不可能。壁锁合的接触式温度计的另一个缺点是,温度仅可以在塑料熔体的边缘上被测量。
——使用红外线温度计,所述红外线温度计在塑化缸体的壁中以壁锁合的方式使用。为了装配接触式温度计而在塑化缸体上需要传感器孔。响应时间明显好于在接触式温度计的情况下的响应时间,但是在此熔体温度也仅在边缘(按照塑料类型和红外线辐射的穿透深度典型地为1-8mm)上被测量。此外,由于红外线辐射的散射和反射而可能导致偏差。塑料熔体的发射系数必须在校准测量中确定。
——激光诱导荧光。为了装配光学通道而在塑化缸体上需要传感器孔。加入塑料中的荧光颜料经由激光射线激发。所导致的荧光由共焦布置结构经由光导体传导到分光计中。对(与温度有关的)荧光光谱的分析允许逆算出在激光射线的焦点区域中的温度。借助于激光诱导荧光可以对径向温度测量求平均值(假如用于激光辐射和荧光辐射的塑料熔体是透明的话),其方式为,改变激光在塑料熔体中的焦点位置。所有的仪器(激光器、分光计、光学通道)是非常耗费的,并且在工业环境中的持久使用被认为是重要的。
在塑化时可能导致在塑化缸体中的对塑化熔体的质量产生不利影响的温度波动。
发明内容
本发明的目的在于,提供一种注塑机的塑化单元,在该塑化单元中可以对影响塑化熔体的质量的温度波动进行识别;以及提供一种相应的方法。
所述目的通过一种具有权利要求1的特征的塑化单元和一种具有权利要求7的特征的方法来实现。
有利的实施方式在从属权利要求中限定。
被注塑的塑料部件的产品质量的不希望的波动主要归因于塑化熔体的不希望的轴向温度曲线(温度梯度),因为所述轴向温度曲线通常远高于径向温度曲线。轴向温度曲线由于在向螺杆前室配给塑料熔体时有效螺杆长度的缩短而产生。为了能够实现在配给时(例如借助于螺杆的滞止压力(Staudruck)和/或转速)主动控制或调节熔体温度而需要测量轴向熔体温度。本发明能够以简单的方式实现所述轴向温度的测量。
本发明的优点:
——对于超声波转换器不需要穿过塑化缸体壁的孔。
——塑料熔体的温度在缸体孔的整个直径上(不仅是在边缘上)被求平均值。
——本发明能够实现非常迅速的响应时间。
——自身不需要校准:在不同位置上的声速测量足以检测轴向温差。这可归因于在配给时在螺杆前室中的接近恒定的压力。
附图说明
根据图1至3针对不同的实施例详细阐述本发明。
具体实施方式
部分地示出用于注模机的塑化单元1,该塑化单元呈可移动地设置在(具有壁2的)塑化缸体的缸体孔中的可转动的塑化螺杆4的形式。通过在注射嘴(未示出)和塑化螺杆4的顶端之间的区域(螺杆前室3)中配给塑化的塑料而使塑化螺杆4远离注射嘴运动。在此,在螺杆前室3中形成所谓的熔料垫(Massepolster)。
如果超声波脉冲沿着(在超声波发射器和超声波接收器之间的)声路S被发射穿过塑料熔体,那么由如下公式得出脉冲穿过熔体的运行时间tLaufzeit:
其中,cL,s(p,T)表示在沿着声路S的位置s上的与压力p和温度T有关的纵向声速。
如果纵向声速cL作为压力p和温度T的函数已知(通过校准测量或优选通过在本领域技术人员已知的对于不同塑料给出声运行时间的表格中查阅,这之所以是可以的,是因为在配给时在螺杆前室中产生至少接近恒定的压力),那么可以由运行时间测量推导出沿着声路S的平均温度。
为了测量在螺杆前室3中的轴向温度分布而在多个轴向位置上实施超声波运行时间测量。该测量可以借助于所谓的反射测量或透射测量来实施。
反射测量在图1中示出。对在螺杆前室3中的熔体温度进行轴向测量。
具有多个超声波转换器5的超声波转换器阵列沿着螺杆前室3安装在塑化缸体的壁2上。备选地也可以利用一个超声波转换器5交替地在不同的轴向位置上以多个注塑周期进行测量。
发射到塑化缸体中的超声波脉冲在缸体孔的上边缘上被反射。声能的一部分继续运行穿过塑化的塑料熔体、在缸体孔的下边缘上被反射并且往回运行至超声波转换器。由在缸体孔的上或下边缘上的反射运行时间(toben或tunten)之差和已知的缸体孔直径dzylinder可以推导出(在配给期间在滞止压力pstau的情况下的)声速并且因此推导出沿着声路的平均熔体温度Tm:
通过在不同轴向位置上的测量得出在螺杆前室3中的轴向温度曲线。在图3示出的分析单元8中进行计算。
在图2示出的透射测量中,具有超声波转换器5的两个对置的超声波转换器阵列6、7在沿着螺杆前室3的不同的轴向位置上安装在塑化缸体的壁2上,其中,其中一个超声波转换器阵列用作发射器阵列6,而其中另一个对置的超声波转换器阵列用作接收器阵列7。备选地也可以利用两个超声波转换器5(发射器和接收器)交替地在不同的轴向位置上以多个注塑周期进行测量。
从发射器阵列6的超声波转换器5发射到塑化缸体中的超声波脉冲运行穿过塑化缸体的壁2的第一半部、继续穿过塑料熔体并且然后穿过塑化缸体的壁2的第二半部至接收器阵列7的对置的超声波转换器5。从超声波脉冲的如此测量的总运行时间tgesamt中还必须减去穿过塑化缸体的壁2的运行时间ts、te。这可以通过借助于在发射器阵列6或接收器阵列7中的超声波转换器5进行的反射测量来确定。声速cL由如下得出:
通过在不同的轴向位置上的测量得出在螺杆前室3中的轴向温度曲线。在图3示出的分析单元8中进行计算。
te的测量是相对耗费的。假如在壁2中存在几乎旋转对称的温度曲线,那么te大致等于ts。因此可以省去te的测量。
本发明可以被用于在配给时产生对注塑过程有利的温度分布。
在图3中示出用于在配给时控制或调节在螺杆前室3中的熔体温度的布置结构(例如可以用于反射测量,也可以用于透射测量)。
在配给时开始测量。只要塑化螺杆4被回拉并且声路在一个位置上因此畅通,就可以在该相应的位置上进行声速测量。对于该布置结构有利的是,在螺杆前室3中的压力(滞止压力)已知并且接近恒定,并且不需要由所测量的声速直接计算与压力和温度有关的熔体温度。
仅在不同轴向位置上的声速变化就足以确定轴向温差(轴向温度梯度)。超声波运行时间向声速或温度的换算在分析单元8中进行。计算出的声速或温度值被控制或调节单元9用于经由驱动塑化螺杆的马达M如此影响机械参量(例如滞止压力、优选螺杆转速),使得在螺杆前室3中由于塑化螺杆4的螺杆长度的缩短而引起的温度下降可以被补偿。该影响优选周期复周期地进行、也就是说不强制地在塑化单元1或注塑机的一个周期期间进行,塑化单元1是所述注塑机的一部分。
分析单元8和控制或调节单元9可以在物理上共同构成在一个构件中。
在所有的实施例中,超声波转换器5贴靠在塑化缸体的壁2上、也就是说不是位于壁2的穿透该壁2的孔中。也可想到,例如在由于装配在塑化缸体上的加热带而产生空间问题时,超声波转换器5以埋入盲孔中的形式设置在壁2中。
有利的是,超声波转换器5例如经由磁保持机构压紧到塑化缸体的壁2上。在超声波转换器5和壁2之间安装超声波凝胶是可取的。如果通过环境空气来被动地冷却超声波转换器5是不够的,那么也可以设置主动冷却装置。
Claims (9)
1.用于注塑机的塑化单元(1),该塑化单元具有可移动且可转动地设置在轴向延伸的塑化缸体的缸体孔中的塑化螺杆(4),在塑化缸体的注射嘴和塑化螺杆(4)的螺杆顶端之间设有螺杆前室(3),其特征在于,多个超声波转换器(5)设置在塑化缸体的壁(2)的不同轴向位置上,并且设有分析单元(8),该分析单元设计成用于由超声波转换器(5)的信号制作在螺杆前室(3)中的轴向温度曲线。
2.按照权利要求1所述的塑化单元,其中,具有沿着螺杆前室(3)设置的超声波转换器(5)的一个唯一的超声波转换器阵列设置在壁(2)的一侧上,其中,所述超声波转换器阵列构成为发送器和接收器阵列。
3.按照权利要求1所述的塑化单元,其中,具有沿着螺杆前室(3)设置的超声波转换器(5)的两个彼此对置的超声波转换器阵列安装在塑化缸体的壁2上,其中,一个超声波转换器阵列构成为发送器阵列(6),而对置的超声波转换器阵列构成为接收器阵列(7)。
4.按照权利要求1至3中至少一项所述的塑化单元,其中,所述超声波转换器(5)优选通过磁保持机构压紧到塑化缸体的壁(2)上。
5.按照权利要求1至4中至少一项所述的塑化单元,其中,在超声波转换器(5)和壁(2)之间设有超声波凝胶。
6.按照权利要求1至5中至少一项所述的塑化单元,其中,设有控制或调节单元(9),该控制或调节单元与分析单元(8)连接,并且该控制或调节单元构成为用于经由驱动塑化螺杆的马达(M)来影响塑化螺杆的机械参量、优选螺杆转速,使得由于塑化螺杆(4)的螺杆长度的缩短而引起的在螺杆前室(3)中的温度下降能够被补偿。
7.用于在使用至少一个超声波转换器(5)的情况下制作在注塑机的塑化单元(1)的螺杆前室(3)中的温度曲线的方法,其中,塑化单元(1)包括具有壁(2)的塑化缸体,其特征在于,由在塑化缸体的壁(2)的不同轴向位置上借助于所述至少一个超声波转换器(5)所获取的信号制作轴向温度曲线。
8.按照权利要求7所述的方法,其中,通过重新定位所述至少一个超声波转换器(5)来获取在不同轴向位置上的信号。
9.按照权利要求7所述的方法,其中,通过多个超声波转换器(5)来获取在不同轴向位置上的信号。
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US5951163A (en) * | 1996-10-16 | 1999-09-14 | National Research Council Of Canada | Ultrasonic sensors for on-line monitoring of castings and molding processes at elevated temperatures |
DE19944709A1 (de) * | 1998-09-24 | 2000-04-27 | Barmag Barmer Maschf | Vorrichtung und Verfahren zur Führung einer Polymerschmelze |
CN1315244A (zh) * | 2000-03-27 | 2001-10-03 | 住友重机械工业株式会社 | 可减小模制产品重量变化的控制注塑机的方法 |
CN101722650A (zh) * | 2008-10-22 | 2010-06-09 | 斯考拉股份公司 | 用于测量挤出机的出口处的塑性化的塑料的温度的方法和装置 |
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US4740146A (en) * | 1986-07-25 | 1988-04-26 | Peter Angelbeck | Apparatus for measuring and controlling the wall thickness of plastic pipes |
JPH08276490A (ja) * | 1995-04-07 | 1996-10-22 | Mitsui Toatsu Chem Inc | 押出成形機シリンダー内樹脂の溶融位置測定方法及び押出成形機の運転方法 |
AT512647B1 (de) | 2012-09-12 | 2013-10-15 | Engel Austria Gmbh | Temperaturverlaufermittlung im Schmelzeraum |
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US5951163A (en) * | 1996-10-16 | 1999-09-14 | National Research Council Of Canada | Ultrasonic sensors for on-line monitoring of castings and molding processes at elevated temperatures |
DE19944709A1 (de) * | 1998-09-24 | 2000-04-27 | Barmag Barmer Maschf | Vorrichtung und Verfahren zur Führung einer Polymerschmelze |
CN1315244A (zh) * | 2000-03-27 | 2001-10-03 | 住友重机械工业株式会社 | 可减小模制产品重量变化的控制注塑机的方法 |
CN101722650A (zh) * | 2008-10-22 | 2010-06-09 | 斯考拉股份公司 | 用于测量挤出机的出口处的塑性化的塑料的温度的方法和装置 |
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AT516452A1 (de) | 2016-05-15 |
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