The vacuum pouring is one at the furthest common procedure for the fast and economical duplication of Urmodellen it is used for plastic parts. With this procedure the duplication takes place with the help of a form from silicone rubber under use of a vacuum chamber for the prevention from cavities in form and workpiece.

For the castings which can be manufactured with the help of the vacuum pouring at present the following materials are available:

• Two-component casting resins (plastics);
• Fusionable wax materials (for the employment as Urmodell for the high quality casting);
• Lowmelting metal alloys.

The basis for the production is the prototype. According to the definition of the shaped part level and the dead head the part is fixed in a framework. Subsequently, this framework is filled out with silicone rubber and warmed up under vacuum. Thus air contained in the silicone and the form escape receive the necessary firmness.

After releasing the Urmodells from form the form is again closed and filled under vacuum with the liquid material. After hardening the plastic the produced parts are released from form and gefinisht. Subsequently, the form is available for further castings.

The vacuum casting technology has the following advantages:

• economical form production
• short term form production
• Hinterschnitte producible (silicone rubber form is arbitrarily frequently divisibly, flexibly, employments in the form usable)
• easy removability
• high duplication accuracy
• Use from moulding forms to the improvement of the shaped part quality possible
• Integration of standard and shaped parts (e.g. bushes, screw mountings) into plastic parts during the casting procedure

possible

Among the disadvantages of the procedure rank:

• fast wear (on the average only 15 to 50 castings per form possible)
• Processing temperature of the material must be realizable by the silicone form
• Problems when manufacturing form elements with very large height in relation to the cross section (e.g. slim drillings)
• problematic disposal of the used up forms
• Hollow body only with the help of special cores (in the fusion method) producible

The effectiveness of the procedure can be increased by simultaneous casting of several parts in a form (multiple form).

An area of application for the vacuum pouring is the production of small series and prototype series within the process chain (rapidly Product development).

Articles in category "Vacuum-pour"

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