济南立强模具有限公司是一家提供济南注塑模具注塑加工等产品的山东模具制造厂家

山东济南注塑模具制造加工

     

新闻动态

您现在的位置: 网站首页>>新闻动态>>影响注塑模具的原因有哪些?

影响注塑模具的原因有哪些?

来源:http://www.sdlqmj.com 日期:2020-06-28 发布人:liqiang 浏览次数:
模具的设计者必须有丰富的设计和注塑成型经验,必须考虑这些影响因素与注塑条件的关系及其表观因素,如注塑压力与模腔压力及充填速度、注射熔体温度与模具温度、模具结构及浇口形式与分布,以及浇口截面积、制品壁厚、塑料材料中增强填料的含量、塑料材料的结晶度与取向性等因素的影响。
The designer of the mold must have rich experience in design and injection molding, and must consider the relationship between these factors and injection conditions and their apparent factors, such as injection pressure and cavity pressure and filling speed, injection melt temperature and mold temperature, mold structure and gate form and distribution, As well as gate cross-sectional area, product wall thickness, the content of reinforced filler in plastic materials, the crystallinity and orientation of plastic materials and other factors.
上述因素的影响也因塑料材料的不同,或者其它成型条件如温度、湿度、继续结晶化、成型后的注塑机的变化而不同。
The influence of the above factors is also different due to different plastic materials, or other molding conditions such as temperature, humidity, continuous crystallization, and the change of injection molding machine after molding.
在影响精密注塑的相关因素当中,模具是获得符合质量要求的精密塑料制品的关键。模具的设计,模具设计是否合理会直接影响塑料制品的质量。由于模具型腔尺寸是由塑料制品要求尺寸加上所用材料的收缩率得来,而收缩率常常是由塑料生产厂家或工程塑料手册推荐的一个范围内的数值,它不仅与模具的浇口形式、浇口位置与分布有关,而且与工程塑料的结晶取向性(各向异性)、塑料制品的形状、尺寸到浇口的距离及位置有关。影响塑料收缩率的主要因素包括热收缩、相变收缩、取向收缩、压缩收缩与弹性回复等,而这些影响因素与精密注塑制品的成型条件或操作条件有关。
Among the factors that affect precision injection molding, mold is the key to obtain the precision plastic products that meet the quality requirements. The quality of plastic products will be directly affected by the design of mold and the rationality of mold design. Because the mold cavity size is obtained by the required size of plastic products plus the shrinkage rate of materials used, and the shrinkage rate is often a value recommended by the plastic manufacturer or engineering plastics manual, which is not only related to the mold gate form, gate position and distribution, Moreover, it is related to the crystal orientation (anisotropy) of engineering plastics, the shape and size of plastic products and the distance and position of gate. The main factors affecting the shrinkage of plastics include thermal shrinkage, phase transformation shrinkage, orientation shrinkage, compression shrinkage and elastic recovery, which are related to the molding or operating conditions of precision injection molding products.
由于注塑过程是把塑料从固态(粉料或粒料)向液态(熔体)又向固态(制品)转变的过程。从粒料到熔体,再由熔体到制品,中间要经过温度场、流场以及密度场等的作用。在这些场的共同作用下,不同的塑料(热固性或热塑性、结晶性或非结晶性、增强型或非增强型等)具有不同的聚合物结构形态和流变性能。凡是影响到上述“场”的因素必将会影响到塑料制品的物理力学性能、尺寸、形状、精度与外观质量。
Because the injection molding process is the process of transforming plastics from solid (powder or granular) to liquid (melt) and then to solid (product). From granular material to melt, then from melt to product, there are temperature field, flow field and density field in the middle. Under the joint action of these fields, different plastics (thermosetting or thermoplastic, crystalline or non crystalline, reinforced or non reinforced, etc.) have different polymer structure and rheological properties. All factors that affect the above "field" will affect the physical and mechanical properties, size, shape, accuracy and appearance quality of plastic products.
这样,工艺因素与聚合物的性能、结构形态和塑料制品之间的内在联系会通过塑料制品表现出来。分析清楚这些内在的联系,对合理地拟定注塑加工工艺、合理地设计并按图纸制造模具、乃至合理选择注塑加工设备都有重要意义。精密注塑与普通注塑在注塑压力和注射速率上也有区别,精密注塑常采用高压或超高压注射、高速注射以获得较小的成型收缩率。
In this way, the internal relationship between process factors and polymer properties, structural morphology and plastic products will be shown through plastic products. The analysis of these internal relations is of great significance to the rational formulation of injection molding process, the rational design and manufacturing of molds according to drawings, and even the rational selection of injection molding equipment. There are also differences in injection pressure and injection rate between precision injection and ordinary injection. High pressure or ultra-high pressure injection and high-speed injection are often used in precision injection to obtain smaller molding shrinkage.

相关新闻

地址: 济南市天桥区太平庄药山镇丁庄工业园8号; 网址:http://www.sdlqmj.com  传真:0531-61388458   手机:18610627886

Copyright © 2018 济南立强模具有限公司   版权所有  鲁ICP备15002024号-2   技术支持:济南诺商 流量统计: