河北11选5走势图

河北11选5走势图

多色注塑机介绍_科骏机械
发布时间:2019-06-27 11:02

多色注塑机
多色多组分注塑使得传统上需要的组装或粘结工序大大减少,同时使产品结构的设计更为灵活。丰富的异种异色材料搭配的可能性,使得可能一次成型的塑料制品更加丰富多彩。国内外注塑机供应商纷纷开发新技术以提升市场竞争力。本文介绍两款新型多色注塑技术。
多色加工技术的典型结构 
 
从目前技术来看,多色技术的实现主要有三种典型的结构形式。 
 
双重注塑
 
双重注塑,即将两种原料同时注塑入模腔。该技术通常是根据预设的注塑速度和模腔的几何形状来决定原料的分布和两种原料的合模点。采用此方法时,需要注塑机具有非常高的准确性和出色的每一循环的重复性。该技术多用于一些灵活性的注塑场合,如加工因原料流动性较差而受阻的部件或者将部件的功能作为重点考虑的加工对象。 
 
复合注塑
 
复合注塑的加工原理是,利用同一射嘴将两种原料注入模内。 
 
通常,先注入外层原料,而内层原料则被包裹在内。根据产品的要求,外层流道可采用关闭式的结构设计。此方法通常被用于加工两种不同成份原料组合的产品。一般情况下,考虑到成本方面的因素,廉价原料可被用作产品的内层或外层。 
 
复合注塑多用于聚酯瓶坯、外壳类产品和汽车部件等产品的加工。以聚酯瓶坯的加工为例,通过利用复合注塑,可增强产品对光线和氧气的阻隔。 
 
多重注塑
 
多重注塑一般可分为下列几种形式: 
 
滑动注塑。当完成预注塑后,模具及滑块保持闭合状态,注塑机射嘴仍向模腔空位中注入第二部分原料,直至完成第二部分注塑并冷却后,模具打开,取出完整部件。这种工艺多用于几何形状简单的零部件,如:密封圈、盖子和密封盖等。 
 
转盘注塑。即动半模可旋转,只有定半模部分会受到产品几何形状的影响,因此可以利用此技术实现单边的良好设计构思。由于该技术允许进行同步注塑,常用于节省加工周期的情况下。该技术主要适用于饮用杯、手把、盖子和密封件等的加工。 
 
转位注塑。该技术多用于部件的第二部分注塑或产品形状必须改变的加工场合。利用这一注塑技术,可大大提高产品设计的自由度,常用于汽车用调节轮、牙刷及一次性剃须刀等的加工。 
 
注塑。即利用机械手将预注塑工件移至第二位置再注塑,从而给予第一和第二注塑加工最大的自由度。该技术主要用于墨盒转移轴、工艺性注塑和牙刷等加工领域。 
 
上述三种加工方法的一个共同特点是,利用高度的全闭环控制,在预设的速度和实际压力下,使第二次注塑不会偏离要求,从而保证了产品的质量。 
 
 
多色注塑技术新进展 
 
国外从1961年即开始开发多色注塑机,其当时的目标就是要将双色组建的生产效率充分提高。其时,主要的方法为插入再封装的技术。考虑在同一注塑周期内利用两套注射装置,在同一副模具内完成两种不同材料的注射。 
 
这一技术最初开始用于全自动生产电话机拨号盘,首先注射一个制件,然后利用一个转动板把一个插件插入到成型制件中。然后第二个制件被加入,最终制件通过一个顶出机构脱模。这一原理获得了专利并成为如今多色注塑技术的基础。 
 
1976年,间隔注塑和三明治注塑技术开始成为多色注塑技术的补充。如今,六色制件已经可以通过一系列生产过程通过一台机器高效精密生产,而插入金属件的插件注塑和应用转盘技术的双色注射如今仍在多组分注射领域广泛应用。 
 
近期,德国的一款全电动注塑机被用于生产装配有LSR唇型密封的冰刀。这款专门用于多色加工的全电动注塑机装配了两套170 的注射装置,一套1 1腔的模具用于同步生产装配有LSR唇型密封的冰刀。 
 
由于液态硅的特殊性能,硬度为50 Shore的LSR和PC可以在同样的模温下同步加工。这样不仅优化了加工过程,而且设备可以适应更复杂的技术要求,从而可实现产品的简单高效生产。 
 
为了生产高质量的LSR与热塑性塑料复合件,该注塑机装配有标准的电动装置以驱使注射装置精确的达到初始注射点和最终点,同时装配有可自由编程的Multilift机器人系统并与整机控制系统整合。从而实现最终制品的快速移出与放置,同时保持极高的加工精度。 
 
两种组分均通过一套封闭系统与模具接触,而且由于应用了无浇口注射技术可以实现材料的更精确利用,同样实现了时间节约。39g制品总体的成型周期只有45s。 
 
为了保证材料的顺利加工,周边设备包括一台LSR加料装置,一套冷却系统和一套Thermolift 100-2完成材料的输送和预干燥。 
 
 
近日,国内科骏机械成功研发出双色注塑机,多色注塑机,实现了多色射出及成型技术的同步。 
 
该立式圆盘四色射出成型机采取多缸油路同步控制,实现合模、开模、射胶、加料、松退全部同步,大大减短了产品的生命周期。油路控制采取闭环伺服阀,实现压力、流量带传感器自动调节与补偿。产品在前三种颜色注塑时不用脱模,可以避免几种颜色冷却后不粘合的情况,同时也避免了把一种颜色从一个模具里拿出来套在另一个模具里合模时容易压伤产品或把产品压出毛边的现象,大量减少产品的不良率。合模采用防暴卸载,低压,机械保护,安全光幕装置,确保机器的安全性。OD1600mm圆盘旋转360度时间为3秒,定位准确度达到±0.05mm。 
 
该机器不仅可用于四色成型,也可以兼容单色、双色、三色成型功能,一机多用,可多元化生产。机械采用四条双合金螺杆,每条螺杆的温度,射胶、加料、松退、座进、座退的压力,流量都能单独设定和控制。机械装配有四付模具,采用圆盘旋转换模,上模固定不动,下模顺时针方向旋转,开机时的前三模为不良品,第四模为成品,之后圆盘每转90度出一个成品。
 
多色注塑机
Multicolor injection molding machine
Multi-color and multi-component injection molding makes the traditional assembly or bonding process greatly reduced, and the product structure design is more flexible. Rich in the possibility of different colored materials, so that it is possible to shape a more colorful plastic products. Domestic and foreign injection molding machine suppliers are developing new technologies to enhance market competitiveness. This paper introduces two new multi - color injection molding techniques.
Typical structure of multi - color processing technology
 
From the point of view of current technology, there are three typical structural forms of the realization of multi-color technology.
 
Double injection
 
Double injection, in which two materials are injected into the mold cavity at the same time. This technique usually determines the distribution of the raw material and the joint point of the two materials according to the preset injection speed and the geometry of the mold cavity. When this method is used, the injection molding machine is required to have very high accuracy and excellent repeatability for each cycle. This technology is mainly used in some flexible injection molding occasions, such as the processing of parts hindered by poor flow of raw materials or the function of parts as the focus of the processing object.
 
compound
 
The principle of compound injection molding is that two kinds of raw materials are injected into the mold by using the same injection nozzle.
 
Usually, the outer material is injected first, while the inner material is wrapped in. According to the requirements of the product, the outer runner can be designed with closed structure. This method is usually used to process products with a combination of two different ingredients. In general, cheap raw materials can be used as the inner or outer layer of a product, considering the cost.
 
Composite injection molding is widely used in the processing of polyester bottle preforms, shell products and automobile parts. Take the processing of polyester bottle preform as an example. By using composite injection molding, the barrier of light and oxygen can be enhanced.
 
Multiple injection
 
Multiple injection molding can generally be divided into the following forms:
 
Slide injection molding. After the pre-injection, the mold and the slider remain closed, and the injection nozzle of the injection molding machine still injects the second part of the raw material into the cavity space, until the second part of the injection molding is completed and cooled, the mold is opened and the complete part is taken out. This process is often used for parts with simple geometric shapes, such as seals, LIDS and LIDS.
 
Turntable injection molding. That is, the moving semimodules can be rotated, and only the fixed semimodules can be affected by the geometric shape of the product. Because this technique allows synchronous injection molding, it is often used to save machining cycles. The technology is mainly suitable for the processing of drinking cup, handle, lid and seal.
 
Transfer injection. This technique is often used for injection molding of the second part of the component or where the shape of the product has to be changed. Using this injection molding technology, can greatly improve the freedom of product design, often used in the processing of automobile adjustment wheel, toothbrush and disposable razor.
 
Injection molding. That is, the use of the manipulator will pre-injection workpiece to the second position and injection, so as to give the first and second injection processing the maximum degree of freedom. The technology is mainly used in the processing fields of cartridge transfer shaft, plastic injection molding and toothbrush.
 
A common feature of the three processing methods mentioned above is that the second injection molding does not deviate from the requirements by using a high degree of full closed-loop control under preset speed and actual pressure, thus ensuring the quality of the product.
 
 
New development of multi - color injection molding technology
 
Foreign countries began to develop multicolor injection molding machine in 1961, and the goal at that time was to improve the production efficiency of bicolor. At that time, the main method for insertion and re-packaging technology. Consider using two injection devices to inject two different materials in the same sub-mould within the same injection cycle.
 
The technology was originally developed for fully automated production of telephone dials, where a piece is injected and a plug-in is inserted into the molded piece using a rotating plate. A second piece is then added and the final piece is demoulded by an ejector mechanism. This principle was patented and is the basis of today's multicolor injection molding technology.
 
In 1976, interval injection and sandwich injection techniques began to complement polychromatic injection techniques. Today, six-color parts can be produced efficiently and precisely by a single machine through a series of production processes, while injection molding with inserts into metal parts and two-color injection using rotary table technology are still widely used in the field of multi-component injection.
 
Recently, an all-electric injection molding machine from Germany was used to produce skates equipped with LSR lip seal. Designed for multicolor processing, the all-electric injection molding machine is equipped with two 170 injection units, and a 1 1 cavity mold is used for synchronous production of an ice cutter with LSR lip seal.
 
Due to the special properties of liquid silicon, LSR and PC with hardness of 50 Shore can be processed simultaneously at the same mold temperature. In this way, not only the processing process is optimized, but the equipment can adapt to more complex technical requirements, so as to achieve simple and efficient production of products.
 
In order to produce high quality LSR and thermoplastic composites, the injection molding machine is equipped with a standard electric device to drive the injection device to the precise initial and final injection points, as well as a freely programmable Multilift robot system integrated with the overall control system. In this way, the final products can be moved out and placed quickly, and the processing accuracy can be maintained extremely high.
 
Both components are in contact with the die through a closed system, and time savings are also realized by the application of no-gate injection technology to achieve more accurate use of materials. The overall molding cycle of 39g products is only 45s.
 
In order to ensure the smooth processing of materials, peripheral equipment includes an LSR feeding device, a cooling system and a Thermolift 100-2 to complete the transportation and predrying of materials.
 
 
Recently, domestic ke jun machinery successfully developed a two-color injection molding machine, multi-color injection molding machine, the realization of multi-color injection and molding technology synchronization.
 
The vertical disc four-color injection molding machine adopts multi-cylinder oil line synchronization control, realizing the synchronization of mold closing, mold opening, glue shooting, feeding and loosening, greatly reducing the life cycle of the product. Oil circuit control adopts closed-loop servo valve to realize automatic adjustment and compensation of pressure and flow with sensor. When the first three colors are injected, there is no need to take out the mold, which can avoid the situation that several colors are not glued after cooling. At the same time, it can also avoid the phenomenon that a color is easy to crush the product or press the product out of the burr when the mold is closed in another mold, which can greatly reduce the defect rate of the product. Adopt anti-riot unloading, low pressure, mechanical protection, safety light curtain device to ensure the safety of the machine. The rotation time of the OD1600mm disk is 3 seconds, and the positioning accuracy reaches ±0.05mm.
 
The machine can not only be used for four-color molding, but also compatible with monochrome, two-color, three-color molding functions, one machine multi-purpose, can be diversified production. The machine USES four double alloy screw, the temperature of each screw, injection, feeding, release, seat, seat back pressure, flow can be independently set and control. There are four sets of moulds mechanically assembled. The circular rotary conversion mode is adopted. The upper mode is fixed and the lower mode rotates clockwise.
 
Multicolor injection molding machine