Estimating Mold Cost

Rees, Herbert

doi:10.3139/9783446401839.008

Cited by 5 publications

(8 citation statements)

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“…1. 27,33,34) A sufficiently high pressure and temperature are applied to realize an isotropic molecular chain distribution and, as a result, PLLA molecular chains in the forming body are randomly oriented. In this case, the isotropic mechanical characteristics is realized.…”

Section: Vacuum Moldingmentioning

confidence: 99%

Piezoelectric characteristics of three-dimensional solid object of poly(l-lactide) fabricated by three-dimensional printing

Hayashi¹,

Kamimura²,

Tsukamoto³

et al. 2015

Jpn. J. Appl. Phys.

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Through three-dimensional (3D) printing, we attempted to fabricate 3D solid objects with piezoelectricity. By optimizing the conditions of 3D printing, we realized the fabrication of a piezoelectric object by 3D printing. In fact, we could produce a poly(L-lactide) (PLLA) object similar to a smart phone case fabricated by 3D printing, the molded body of which has button sensors at the desired sites by exploiting the piezoelectric properties of PLLA. Finally, we confirmed that the PLLA object behaved as a fully functional sensor.

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Section: Vacuum Moldingmentioning

confidence: 99%

Piezoelectric characteristics of three-dimensional solid object of poly(l-lactide) fabricated by three-dimensional printing

Hayashi¹,

Kamimura²,

Tsukamoto³

et al. 2015

Jpn. J. Appl. Phys.

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“…This is of no surprise as the use of draft is usually used to reduce the force required for removal of the part from the mould (Rees, 1995). which would incur the lowest part ejection force whilst allowing a minimum disruption to a parts intended geometry (draft angle) and build time (layer thickness).…”

Section: Ejection Forcesmentioning

confidence: 99%

Layer thickness and draft angle selection for stereolithography injection mould tooling

Harris¹,

Hopkinson²,

Newlyn³

et al. 2002

International Journal of Production Research

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“…Figure 3 indicates that greater tooling draft angles result in lower ejection forces in the SL moulding process for all polymers. This is of no surprise, as the draft is normally used to reduce the force required for removal of the part from the mould [22].…”

Section: Surface Roughness Measurementsmentioning

confidence: 99%

Selection of mould design variables in direct stereolithography injection mould tooling

Harris

Newlyn

Dickens

2002

Proceedings of the Institution of Mechanical Engineers, Part B:

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• This article was published in the journal, Proceedings of the Abstract: Stereolithography (SL) can be used rapidly to produce injection moulding tools. The disadvantage of the technique is that it is capable of producing only a small number of parts before failure. Stereolithography tools may break under the force exerted by part ejection when the friction between a moulding and a feature of the tool is greater than the tensile strength of the tool, resulting in tensile failure.Very few justi®ed recommendations exist concerning the choice of mould design variables that can lower the part ejection force experienced and reduce the risk of SL tool failure. This research investigates the ejection forces resulting from the injection moulding of polypropylene (PP), acrylonitrile±butadiene ±styrene (ABS) and polyamide 66 (PA66) parts from SL tools that are identical in all respects except for their build layer thickness (a process variable when generating the SL tooling cavities) and incorporated draft angles (a tooling design variable). This work attempts to identify appropriate evidence for recommendations with respect to these variables and SL injection moulding.The results show that linear adjustment of draft angle results in a fairly minor linear change in part ejection force according to the moulding material. A linear adjustment of the build layer thickness results in a greater change in part ejection force as a more non-linear relationship. In both cases the greatest ejection forces were experienced by PA66, then ABS and then the PP parts. The results also show that the surface roughness of all tools remains unchanged after moulding a number of parts in all polymers.A mathematical model was used in an attempt to predict ejection forces according to the moulding material used. This model did re¯ect the experimental results in terms of relative values but not in absolute values, which may be due to the limitations imposed by the development of the expressions and uncertainty about some speci®c values.

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Estimating Mold Cost

Cited by 5 publications

References 0 publications

Piezoelectric characteristics of three-dimensional solid object of poly(l-lactide) fabricated by three-dimensional printing

Piezoelectric characteristics of three-dimensional solid object of poly(l-lactide) fabricated by three-dimensional printing

Layer thickness and draft angle selection for stereolithography injection mould tooling

Selection of mould design variables in direct stereolithography injection mould tooling

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