Step of the vertical walls for warpage compensation on plastic housings

Pal, S G; Goanță, Viorel; Bistriceanu, D P

doi:10.1088/1757-899x/997/1/012102

Cited by 2 publications

(1 citation statement)

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“…By changing the thickness of each wall individually, they were able to find a combination of wall thicknesses that yielded the least amount of warpage. Another research, based on a similar idea, was conducted by Pal et al [24]. They tried to reduce the warpage of a box-shaped part by adding a step to the edges.…”

Section: Introductionmentioning

confidence: 99%

Correction of mould cavity geometry for warpage compensation

Kastelic

Starman²,

Cafuta³

et al. 2022

Int J Adv Manuf Technol

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Warpage is one of the most challenging defects occurring in plastic injection moulded parts. Various approaches to overcome this issue have been proposed in the literature, but they all provide only partial solutions to the problem. This paper proposes a new method for the compensation and minimisation of warpage. The method is based on Mould Cavity (MC) correction. In contrast to other similar methods, here the MC correction is accomplished through a direct comparison of the local deviations of the warped part's geometry to the desired geometry of the part. Modifying the MC shape accordingly yields parts with a lower shape discrepancy from the desired geometry compared to the nonadjusted shape. The key novelty of the paper is the development of software that iteratively adjusts the MC shape to minimise local deviations. In every iteration, the warped part is compared to the desired geometry and the MC geometry is adjusted accordingly. A curved thin-walled plate part case study demonstrates the method's capabilities. We show that the maximum warpage value of 0.005 mm (0.7% of the initial maximum warpage) was reached after three iterations of MC geometry correction and remained stable afterwards.

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Section: Introductionmentioning

confidence: 99%