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Less deformed parts by an optimized tempering layout

Less deformed parts by an optimized tempering layout

News 11.10.2019

As in the past years, SIGMA Engineering GmbH from Aachen, Germany, is exhibiting at MOLDPLÁS, Batalha, Portugal, between November 6th and 9th, 2019. At its booth (Pavillion 2, booth 2B09), SIGMA will present its latest release SIGMASOFT® Version 5.3 as well as the new SIGMAinteract®, which allows the communication of simulation results within the company and with customers.

SIGMA PR Moldplas 2019 Pic1

Figure 1 – Comparison of the resulting part deformation for the original tempering concept (right) and for the optimized channel layout (left)

SIGMA demonstrates with a customer example how to prevent deformation of a part by analyzing the positioning of the cooling channels. Therefore, SIGMA uses one of the key technologies from SIGMASOFT® – the Autonomous Optimization. This tool allows a multi-criteria optimization of the whole injection process in short and efficient way.

SIGMA was consulted by one of its customers to help reduce the deformation of a part out of 20% mineral PP after molding. As this part had to be assembled on a bumper, it should not have any docking defects such as gaps between the two parts. Thus, tolerances for the part were tight.

The first thing that was evaluated is the homogeneity of the cavity temperature and its effect on the part deformation. A first simulation in SIGMASOFT® over 10 cycles permitted the analysis of the deformation and its causes: a significant hot spot on the moving half of the mold was identified. Regulation of this area is difficult due to the shape and the small wall thickness of the cavity.

After consultation with the mold maker, it was decided to try to modify the position of the closest cooling channel with a new drilling to improve the cooling of this area. The plan was to save the existing cavity with this technically simple and economically efficient solution. To optimize the cooling effect, in the next step SIGMA evaluates the exact position of the cooling channels.

SIGMA PR Moldplas 2019 Pic2

Figure 2 – Geometry of the nozzle side of the mold: determining the ideal position of a new drilling for thetempering channel in z-direction viaSIGMASOFT® Virtual Molding

In SIGMASOFT® Virtual Molding, the drilling geometry is parameterized in such a way that it can move along the Z axis of the model (Fig. 2). Afterwards, the virtual DoE functionality, which is included in SIGMASOFT® Autonomous Optimization, automatically calculated all possible positions of the drilling. The deformation of the part is described via the distance between the walls of the part, using position sensors. This makes an automatic determination of the impact of the channel position on the deformation possible. The comparison of the two simulations, initial and optimal, shows the gain on the dimensional tolerance of the produced part. The deformation is reduced by a total of 0.9mm from 1.4mm to 0.5mm (see Figure 1).

With the help of SIGMAinteract® all results from this study were directly shared with the customer and project partner. Thus, the communication was made significantly easier and a maximum gain of knowledge was guaranteed. Thanks to the conducted virtual DoE, the customer was able to start production quickly. The modification carried out was low-cost and made it possible to save the existing cavity block.

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