Mold Surface Analysis after Injection Molding of Highly Filled Polymeric Compounds

Chval

Sedlacek

2020

KEM

Additive manufacturing is rapidly developing technology in all areas of industry. It is reducing the delivering time of each prototype from the manufacturer to the final user. This paper deals with mechanical properties of lattice structures. They are produced by additive technologies from the plastic material. Lattice structures are special space-filling unit cells, which can fill gaps in parts. They have good ratio between overall weight and strength. Nowadays are these structures commonly used, but their mechanical properties are not well described. This makes the design process difficult. Mechanical compressive test and virtual evaluation by the finite element method was performed. It was done for three different Quad-Diametral structures (Quad-Diametral, Quad-Diametral-Line and Quad-Diametral-Cross). Results from both testing approaches (real measurement and finite element method) are deeply described in this paper. It was shown, that the Quad-Diametral-Cross lattice cell has higher mechanical properties comparing to others. Increasing of the stiffness was 121% only with weight higher by 43%. The plastic material Ultimaker PLA (polyactic acid) was used as reference material in this research.

Section: Production Of Specimensmentioning

confidence: 99%

Compressive Strength Prediction of Quad-Diametral Lattice Structures

Chval

Sedlacek

2020

KEM

“…1) was designed using the CAD software Siemens NX 11 and the Moldex 3D Designer, which was also used for mold-flow analysis based on the finite element method. This spiral cavity design was also used for viscosity testing in the experimental injection molding machine [8,9]. This difference corresponds to the maximal and minimal parameters according to the material data sheet.…”

Section: Viscosity Testing Processmentioning

confidence: 99%

Viscosity Testing of Plastic Material PA6 with 15% of Glass Fibers

Zahalka

2018

MSF

The main aim of this paper was to describe the viscosity and injection mold filling behavior of PA6 with 15% of glass fibers. Injection molding is one of the most widely used processes for polymer products. The quality of these products is directly linked to correct choice of process parameters. It is necessary to understand the filling behavior of the polymer material during the injection molding process. The spiral flow test was carried out in this study to explore the effects of several injection process parameters. The resulting lengths of spiral flow were compared. The polymer material under test was Polyamide 6 with 15% of short glass fibers (trade name: Durethan BKV 15). Virtual testing as well as real testing was performed. A predominantly linear relationship between the flow length and the mold temperature, melt temperature and injection pressure is described here. A special mold was designed for this test.

“…Materials with melting temperatures above 300°C are used for plastic molds nowadays: ABS, PE, PP or PA. Delivering time of mold can be reduced by 90% and cost saves are only 75% by usage of prototype mold from the plastic material. [1,2] Prototype molds from plastic materials suffer from a major problem. Their dimensional stability and durability need to be checked thoroughly in the course of the molding process.…”

Section: Introductionmentioning

confidence: 99%

Design of Injection Mold from Plastic Material

Chval

Sedlacek

2020

KEM

This paper deals with the use of plastics for making injection molds. Mold production times reduced by 90% and costs cut by up to 75% are some of the benefits of prototype molds from plastic materials. Today, materials with melt temperatures above 300 °C are used for plastic molds. They include ABS, PE, PP and PA. In this study, testing of high-temperature resin from Formlabs was performed. Compression and tensile test data are compared with the datasheet values and with virtual simulations. The tests were carried out at different temperatures. Based on their results, one can identify a suitable molding process with molds from this material.