It is not likely that the backside of the wall of this part will be uniform, and that has to be factored into the design and engineering of the part.
The single most important factor in producing quality thermoformed parts is the tooling used to form the parts!
The soft, heated sheet of plastic is draped into a female mold. Vacuum lines built into the mold draw the air from between the plastic and the mold, drawing the plastic against the surface of the mold while atmospheric pressure pushes against the backside of the plastic.
In pressure forming, a heated sheet of plastic is pressed (hence the name) between two molds instead of being pulled into place around a single mold using suction. Pressure forming is ideal for manufacturing plastic parts or pieces that need to be more precisely shaped on both sides and/or require a deeper draw (they need to extend farther/deeper into a mold), such as appliance casings that need to look aesthetically pleasing on the exterior and snap into place or fit a precise size on the interior side.
Webs can form around the mold, which is due to overheating the plastic and so must be carefully monitored. Webbing can also occur when a mold is too large or parts of the mold are too close together. Finally, objects that are formed often stick to the mold, which is remedied by using a draft angle of three degrees or more in the mold. Types of molds[edit]
More than 500 Units over the Life of the Product: Once it appears that production of the product will reach 500 units, making an investment in Leia o relatório completo thermoformed plastic makes sense, as the investment in tooling will pay for itself in a significantly reduced per-part cost.
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I love it as a get started cheap method. like you said if you find you want more better capability then you can justify spending more money and time to build a better one.
Virtually all thermoplastics can be supplied as sheet and vacuum formed. The more commonly used materials are listed below.
The material must also provide hot strength and flow characteristics to create a structurally functional part that is cosmetically appealing and able to accept detail.
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Press cutting: This is a very precise method of cutting which uses a press and a custom precision made cutting tool. This method is very suitable for items where the roller cutter process wouldn't achieve the precision required.
A photo-electric beam is incorporated in the machine to scan between the bottom heater and the sheet of plastic. If the sheet of plastic sags down and breaks the beam, then a small amount of air is injected into the bottom chamber, thus lifting the sheet to stop it from sagging.