Virtual Dimensioning of Challenging LSR-Processes

At Fakuma 2018, SIGMA Engineering will present in a joint project the real and virtual production of a complex silicone part with EMDE and Momentive. The focus is the early design and optimization of mold and processes. SIGMA accompanied the whole development process of the pot cloth and assisted to determine the ideal configuration for production.

Figure 1 – A Flow length of 135 mm with a fine honeycomb structure and a wall thickness of 1 mm in the majority of the part – Interested visitors can experience the virtual as well as real production of the pot cloth at the booths of Momentive and SIGMA Engineering.

From Virtual DoE to Hands-On Virtual Molding

Aachen, August 23^rd, 2018 – From October 16^th to 20^th, SIGMA Engineering GmbH, Aachen (Germany), is again exhibiting at Fakuma 2018 in Friedrichshafen, Germany. At booth A5-5105 SIGMA demonstrates the latest application of its SIGMASOFT^® Autonomous Optimization. As a consistent further development of the SIGMASOFT^® Virtual Molding technology, Autonomous Optimization not only offers users the opportunity to perform virtual design of experiments (DoE) but the software also determines automatically the optimum process configurations to achieve the given target: e.g. short cycle time or balanced part filling with low pressure requirement, with the help of a fully automatic optimization.

The capability of the technology was used during a joint project with Momentive Performance Materials GmbH, Leverkusen (Germany), EMDE MouldTec GmbH, Oberbachheim (Germany), Wittmann Battenfeld GmbH, Kottingbrunn (Austria), and ACH solution GmbH, Fischlham (Austria), for the design of a pot cloth from LSR (Liquid Silicone Rubber). In the process, the simulation was used alongside the whole development of part, mold and process starting from the part design phase. In the further course it helped to answer important questions, such as what is the optimal connection via the cold runner or how to design an appropriate heating cartridge concept to achieve a homogenous temperature distribution.

The pot cloth is a complex part with a shot weight of 95 g and a flow length of 135 mm (Fig. 1) with a predominantly maximum wall thickness of 1 mm. A uniform part filling without the premature start of a curing reaction is therefore critical to part quality. Due to this fact, at first the number as well as the best positions for the cold runner nozzles were determined in a virtual DoE. With this approach any number of variants can be calculated in a single simulation and afterwards can be compared and evaluated on the basis of predefined target values, e.g. pressure requirements and risk of air entrapments. In the further course of the project, not only the ideal process settings were determined with the help of SIGMASOFT^® Virtual Molding, but also the complete heating concept of the mold was optimized. Based on the results of the virtual analysis the mold was then built by EMDE MouldTec (Booth A4-4307).

At Fakuma, interested parties will not only experience the complete design and virtual production at the SIGMA booth, but will also be able to follow the real production of the pot cloth. The realized mold will run live at the Momentive booth A4-4307. It will be produced with Silopren LSR 2650 on a Smartpower 90/350 UNILOG B8 machine of Wittmann Battenfeld (Booth B1-1204), who also provide the handling system. The mold and cold runner block from EMDE are combined with a pump and mixing unit ACH “MaxiMix 2G” from ACH solution GmbH (Booth A4-4307).

SIGMA (www.sigmasoft.de) is sister company to MAGMA (www.magmasoft.de), the world market leader in casting process simulation technology based in Aachen, Germany. Our SIGMASOFT® Virtual Molding technology optimizes the manufacturing process for injection molded plastic components. SIGMASOFT® Virtual Molding combines the 3D geometry of the parts and runners with the complete mold assembly and temperature control system and incorporates the actual production process to develop a turnkey injection mold with an optimized process.

At SIGMA and MAGMA, our goal is to help our customers achieve required part quality during the first trial. The two product lines – injection molded polymers and metal castings – share the same 3D simulation technologies focused on the simultaneous optimization of design and process. SIGMASOFT® Virtual Molding thus includes a variety of process-specific models and 3D simulation methods developed, validated and constantly improved for over 25 years. A process-driven simulation tool, SIGMASOFT® Virtual Molding provides a tremendous benefit to production facilities. Imagine your business when every mold you build produces required quality the first time, every time. That is our goal. This technology cannot be compared to any other simulation approach employed in plastics injection molding.

New product success requires a different communication between designs, materials, and processes that design simulation is not meant for. SIGMASOFT® Virtual Molding provides this communication. SIGMA support engineers, with 450 years of combined technical education and practical experience, can support your engineering goals with applications specific solutions. SIGMA offers direct sales, engineering, training, implementation, and support, by plastics engineers worldwide.

Source: SIGMASOFT