Saechtling Kunststoff Taschenbuch

Baur,; Brinkmann, André; Osswald, Stefan; Rudolph, Matthias; Schmachtenberg,

doi:10.3139/9783446437296.fm

Cited by 62 publications

(69 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The orientation of nonmagnetic platelet-shaped particles during the injection molding process is mainly shear induced [21,29]; the orientation of magnetic particles is mainly caused by the integrated magnetic field, as seen ideally in the scheme in Figure 14. For the magnetic field induced orientation of the filler particles in accordance with the arcuate magnetic field inside the cavity, the viscosity of the matrix material is significant.…”

Section: Discussionmentioning

confidence: 99%

“…The properties of polymer bonded magnets mainly depend on the filler particle type, amount, and distribution in the polymer matrix [21] in complex interactions with the magnetic field inside the cavity, the process parameters, and the geometry. Common filler contents are between 50 and 65% [21], common filler materials can be oxide ceramics (e.g., strontium ferrite (SrFeO)), or rare earth material (e.g., neodymium iron boron (NdFeB)) [17]. The magnetic properties of pole-oriented injection molded parts can be predicted using magnetostatic simulation models [20,22,23].…”

Section: Introductionmentioning

confidence: 99%

“…A second possibility is the 2 Journal of Polymers magnetization of the parts after the injection molding process [3,5]. The properties of polymer bonded magnets mainly depend on the filler particle type, amount, and distribution in the polymer matrix [21] in complex interactions with the magnetic field inside the cavity, the process parameters, and the geometry. Common filler contents are between 50 and 65% [21], common filler materials can be oxide ceramics (e.g., strontium ferrite (SrFeO)), or rare earth material (e.g., neodymium iron boron (NdFeB)) [17].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Variation of the Pole Length in Pole-Oriented Bonded Rings due to the Location and Number of Injection Points

Kurth

Drummer

2017

Journal of Polymers

View full text Add to dashboard Cite

Polymer bonded magnets are compounds consisting of a polymer matrix with embedded hard magnetic filler particles. These materials are mainly used in applications in actor or sensor technology. One example is the application as multipolar encoder wheel in magnetic sensors. Depending on the application different requirements have to be fulfilled, such as a high pole length accuracy and repeatability. This investigation deals with the production of multipolar rings in the injection molding process for sensor applications and influences of the design of the gating system on the pole length accuracy. It is shown that the number of injection points and developing weld lines, as well as the positioning of the injection points, has a major influence on the magnetization characteristics of the molded rings. In general, a positioning of injection points and weld lines in the pole pitch and higher number of injection points lead to rings with a high reproduction accuracy of the pole length of the mold.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Variation of the Pole Length in Pole-Oriented Bonded Rings due to the Location and Number of Injection Points

Kurth

Drummer

2017

Journal of Polymers

View full text Add to dashboard Cite

show abstract

“…The properties of polymer bonded magnets are mainly influenced by the filler particle type, amount, and distribution in the polymer matrix [13] with complex interactions with the magnetic field inside the cavity, process parameters, and parts geometry. Due to the increase in the viscosity and, thus, lower degree of particle orientation when using compounds with higher filler degree, usually compounds with a filler volume content in between 50% and 65% are used [13].…”

Section: Introductionmentioning

confidence: 99%

“…Due to the increase in the viscosity and, thus, lower degree of particle orientation when using compounds with higher filler degree, usually compounds with a filler volume content in between 50% and 65% are used [13]. Commonly used filler types are ceramic filler materials, as for example strontium or barium ferrite, or rare earth filler materials, such as neodymium iron boron or samarium cobalt.…”

Section: Introductionmentioning

confidence: 99%

Effect of the variation of the gating system on the magnetic properties of injection molded pole-oriented rings

Kurth

Drummer

2016

Journal of Polymer Engineering

View full text Add to dashboard Cite

Abstract The demand for contactless and wear-free sensor systems for the measurement of different physical values, such as angle, position, or speed has increased over the past years and opened up new application areas for magnetically sensitive sensors. Polymer bonded magnets can be used as signal transmitters in these sensor applications. In general, a high precision and good repeatability of the magnetic field is required, whereas in particular, a high peak flux density and accurate pole length of each pole is demanded for precise measurement. These polymer bonded magnets can be produced economically using the injection molding process with an integrated magnetization of the particles, such that a second magnetization step is unnecessary. This article addresses the influences of the gating system on the magnetic properties of multipolar bonded rings. Further, the particle orientation as well as filler content at different locations, and along the pathway are investigated. It was evaluated that the gating system significantly influences the pole length accuracy, as well as the peak flux density. However, differences in the filler orientation and content cannot be analyzed quantitatively.

show abstract

Mechanical performance and supermolecular morphology of void free polypropylene manufactured by fused filament fabrication

Huang

Schlarb

2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

It is known from the literature that freedom from macroscopic defects (voids) is an essential prerequisite for good mechanical properties of 3D-printed components manufactured using fused filament fabrication. The present study further shows that the morphology and mechanical properties of void free components are significantly influenced by the choice of process parameters.Components that were printed at low temperatures and high speeds show fair and inhomogeneous supermolecular morphology, clearly visible weld seams and a special flow-induced staggered structure of the individual strands laidup. At higher magnification in the optical microscope, transcrystalline structures are visible starting from the contact area between the strands, that is, crystallization has started at the interface between the strands and is moving forward towards the center of the strands. In contrast, the samples printed at high temperatures and low speeds show a homogeneous supermolecular morphology with overall larger spherulites and a higher degree of crystallinity and compared to the specimens printed with the low temperature/high speed-set much better mechanical properties. A numerical simulation of the temperature at the contact point of the strand emerging from the hot nozzle and the cooled strand neighbor agrees well with the measured behavior. The thermal simulation thus enables the temperature to be calculated at any point in time in the welding contact and thus access to the local thermal conditions during joining, cooling and the formation of the morphology.

show abstract

Saechtling Kunststoff Taschenbuch

Cited by 62 publications

References 0 publications

Variation of the Pole Length in Pole-Oriented Bonded Rings due to the Location and Number of Injection Points

Variation of the Pole Length in Pole-Oriented Bonded Rings due to the Location and Number of Injection Points

Effect of the variation of the gating system on the magnetic properties of injection molded pole-oriented rings

Mechanical performance and supermolecular morphology of void free polypropylene manufactured by fused filament fabrication

Contact Info

Product

Resources

About