Plastic droplet welding: bond strength between plastic freeforming structures and continuous fiber-reinforced thermoplastic composites
Plastic droplet welding: bond strength between plastic freeforming structures and continuous fiber-reinforced thermoplastic composites
复制标题
塑料熔滴焊接：塑料自由成型结构与连续纤维增强热塑性复合材料之间的粘合强度
DOI：
10.1007/s40194-019-00714-3
复制
发表时间：
2019
影响因子：
2.1
通讯作者：
W. Truemper
中科院分区：
文献类型：
--
作者：
E. Moritzer;A. Hirsch;H.-P. Heim;C. Cherif;W. Truemper
塑料自由成型（PF）是一种基于3D CAD数据通过分层施加塑料液滴来生产三维塑料零件的增材制造工艺。该工艺用于在有机板材上生产客户特定的复杂几何形状（原型和小批量）。一种类似的连续工艺是通过注塑将第二组分注射到有机片材上。PF结构和有机片材之间的充分结合对于每种应用都是特别重要的。如果不能保证这一点，则复合系统不能承受机械载荷并失效。施加在系统上的力不再能够在PF结构和有机片材之间传递。有机片材由玻璃纤维增强聚丙烯（PP）制成。有机片材和PF结构之间的连接通过将熔融聚合物液滴和有机片材的表面焊接来实现。PF结构由PP制成，以确保部件的可焊接性具有足够的兼容性。在PF工艺中加工PP是一个挑战，因为PP是一种半结晶材料。与非晶材料相比，半结晶材料的收缩率显著更高。由于部件的分层结构，各个层的收缩导致不期望的翘曲。通过测定三点弯曲试验中的弯曲强度来研究有机片材与PF结构之间的粘合强度。调查包括工艺参数的优化，以最大限度地提高粘合强度。实验研究表明，喷嘴和构建室温度的增加导致更高的粘合强度。在进一步的研究中，尽管预期的热辐射，喷嘴的温度对表面温度没有显着的影响。表面温度几乎仅取决于构建室的温度。
Plastic freeforming (PF) is an additive-manufacturing process for producing three-dimensional plastic parts based on 3D CAD data by applying plastic droplets in layers. This process is used to produce customer-specific and complex geometries (prototypes and small series) on organic sheets. A comparable serial process is the injection of a second component onto organic sheets by injection molding. A sufficient bond between the PF structure and the organic sheets is of particular importance for each application. If this is not guaranteed, the composite system cannot withstand the mechanical load and fails. The force exerted on the system can no longer be transmitted between the PF structure and the organic sheet. The organic sheet is made of glass fiber-reinforced polypropylene (PP). The connection between the organic sheet and the PF structure is achieved by welding the molten polymer droplets and the surface of the organic sheet. The PF structures are made of PP to ensure sufficient compatibility with regard to the weldability of the components. The processing of PP in the PF process is a challenge because PP is a semi-crystalline material. The shrinkage of semi-crystalline materials is significantly higher compared to amorphous materials. Due to the layered structure of the components, the shrinkage of the individual layers results in undesired warpage. The adhesive strength between the organic sheet and the PF structure is investigated by determining the bending strength in the 3-point bending test. The investigations include an optimization of the process parameters to maximize the adhesive strength. The experimental investigations show that an increase of the nozzle and build chamber temperature leads to a higher adhesive strength. In further investigations, the temperature of the nozzle shows no significant influence on the surface temperature despite the expected heat radiation. The surface temperature is almost only dependent on the temperature of the build chamber.
登录
查看更多内容
适用于碰撞和 3D 应用的纬编预成型件
DOI：
--
发表时间：
2016
期刊：
影响因子：
--
作者：
M. Haupt;Huangmei Lin;C. Cherif;S. Krzywinski
通讯作者：
S. Krzywinski
功能解剖学
DOI：
--
发表时间：
2021
期刊：
影响因子：
--
作者：
C. Stang;H. Appell
通讯作者：
H. Appell
工业添加剂 Fertigung funktionsfähiger Kunststoffteile
DOI：
--
发表时间：
2016
期刊：
Lightweight Design
影响因子：
--
作者：
E. Duffner
通讯作者：
E. Duffner
用于轻质结构的纺织材料
DOI：
--
发表时间：
2016
期刊：
影响因子：
--
作者：
C. Cherif
通讯作者：
C. Cherif