Proyecto-Inyeccion de Plasticos

7/28/2019 Proyecto-Inyeccion de Plasticos

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El trabajo se entregar a Alfonso en el edificio de fundicin antes de 25 de Junio.

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Marcaremos dos das para las tutoras

Mircoles 19 de Mayo a las 16:00.

Mircoles 26 de Mayo a las 16:00.

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Para cualquier cosa ponerse en contacto conmigo a la direccin:SULPRK#ROHFRP


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A fan gate is a wide edge gate with variable thickness. It permitsrapid filling of large parts or fragile mold sections through a large

entry area. It is used to create a uniform flow front into wide parts,where warpage and dimensional stability are main concerns.

The gate should taper in both width and thickness, to maintain a constantcross sectional area. This will ensure that:

1. The melt velocity will be constant2. The entire width is being used for the f low3. The pressure is the same across the entire width

'LPHQVLRQVAs with other manually trimmed gates, the maximum thicknessshould be no more than 75% of the part thickness.

Typical gate sizes are from 0.25 to 1.6 mm thick. The gate width is typicallyfrom 6.4 mm to 25% of the cavity length.

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An edge gate is located on the parting line of the mold and typicallyfills the part from the side, top, or bottom.

'LPHQVLRQVThe typical gate size is 6% to 75% of the part thickness (or 0.4 to 6.4mm thick) and 1.6 to 12.7 mm wide. The gate land should be nomore than 1.0 mm in length, with 0.5 mm being the optimum.

)LOPIODVKJDWHA film gate is similar to a ring gate, but it is used for straight edges. Itconsists of a straight runner and a gate land across either the entirelength or width of the cavity or a portion of the cavity. It is used foracrylic parts, and generally for flat designs of large areas wherewarpage must be kept to a minimum.

'LPHQVLRQVThe gate size is small, approximately 0.25 to 0.63 mm thick. Theland area (gate length) must also be kept small, approximately 0.63mm long.

6XEPDULQHWXQQHOFKLVHOJDWH A submarine gate is used in two-plate mold construction. An angled,tapered tunnel is machined from the end of the runner to the cavity,just below the parting line. As the parts and runners are ejected, thegate is sheared at the part.

If a large diameter pin is added to a non-functional area of the part,the submarine gate can be built into the pin, avoiding the need of avertical surface for the gate. If the pin is on a surface that is hidden, it


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does not have to be removed.

Multiple submarine gates into the interior walls of cylindrical partscan replace a diaphragm gate and allow automatic de-gating. Theout-of-round characteristics are not as good as those from adiaphragm gate, but are often acceptable.

'LPHQVLRQVThe typical size is 0.25 to 2.0 mm in diameter. It is tapered to thespherical side of the runner.


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Como frmula emprica para calcular el dimetro de los canales de alimentacin, podramos utilizar lasiguientes:

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donde:D = dimetro del canal (mm)W = peso de la pieza (gr)L = longitud de los canales (mm)


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6SUXHComo frmula emprica para determinar la dimensiones del bebedero, podramos utilizar las siguientes:

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