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Forside › Konstruktion & Prototyper › TOOLING PATTERN & CORE
TOOLING PATTERN & CORE
TOOLING PATTERN & CORE
Støbeværktøjet og hvad du skal tage hensyn til under konstruktionen af emner der skal støbes med Investment Casting
TOOLING PATTERN & CORE
Wax Pattern tooling is necessary for all investment castings.  Te tool is made from high grade aluminum, and designed to accept te flow of  molten wax under ekstreme pressure, in order to allow it to solidify into te wax pattern which is used to form te ceramic mold during te investing process.  Unlike sand casting, lost wax tooling replicates te final casting in reverse, due to te fact that we cut “cavities” in which te wax flows to form our patterns.  This tooling is often designed to be “collapsible”, in other words, it must be able to be taken apart to remove te solid wax patterns when they have cooled.  Another critical element of te tooling design is that te tooling must be constructed so that te wax patterns produced are larger than te final casting dimensions.  This is due to te fact that metal shrinks during its solidification, so our Engineers must calculate an expected shrinkage rate for every dimension in te tool, and apply those expected shrinkage rates when cutting te tooling.  In te pattern tooling, any internal features can be produced, however if te metal components of te tooling cannot be removed from te wax after solidification has taken place, a suitable method of coring will need to be utilized to form internal features.
Soluble Wax Coring Tooling is not required for every investment casting, but in some cases is necessary, and is used in conjunction with te main wax tooling.  In fact, this tooling looks very similar to wax pattern tooling, and is also injected with molten wax under high pressure.  Te difference is that te waxes produced are made from a special grade of soluble wax, which can easily be dissolved in a mild etch.  This feature allows us to produce tooling to form one or more of te internal geometries of a casting as a solid wax shape, then transfer that wax to te pattern wax injection die, and te pattern wax (blue in te photograph) will be injected around te soluble wax (yellow in te photograph).  After te pattern wax has solidified, we are left with a composite assemble of te two waxes fused together, and then we simply etch away te soluble wax to reveal te inner geometries.
Wax coring is utilized in applications where te resulting internal features are able to be shelled during te standard investing process.  If te internal features cannot be shelled due to size and/or location, then a solid ceramic must be utilized.
Ceramic Core Tooling once again is similar to te functionality of wax tooling, however it is typically made from steel rather than aluminum for durability reasons.  Ceramic core tools do not use wax injection, rather, they are filled with a ceramic slurry and allowed to dry to a solid so that te slurry forms into a solid ceramic piece (white in photograph).  These ceramic cores perform te same function as te soluble wax core, in that they are placed into te wax pattern tooling, and te pattern wax is injected around them to form a composite piece (blue in photograph).  However, since te core is now in place, and is already made from ceramic, there is no need to remove it, and te composite pattern can now proceed directly to te shelling operation to build te ceramic shell around te remaining outer surfaces.
Ceramic coring is te most costly coring method, and is used in applications where internal geometries need to be cast, but there is no other practical way to build te ceramic shell using standard dipping, or “investing” to form te ceramic.  Te completed casting seen in this photograph (grey) is an example of a component with intricate internal details that are not easily accessible for shelling, and therefore could not be cast with this level of detail without te ability to use ceramic coring.
Other Types of Tooling Used
Checking Gauges are sometimes required for castings in order to verify certain specific dimensions or characteristics of a casting during te manufacturing or inspection process.  If a checking gauge is required, it will be designed and built by us to ensure suitability for te application, or we can accept checking gauges from te customer for use in our facility.
Straightening Fixtures are usually required if a casting tends to move or distort during te casting process.  Te need for straightening of castings is expected in many cases due to inherent design conditions which lend some castings to be less rigid than others, and in no way causes any damage to te integrity of te casting.  As with checking gauges, we are pleased to take care of te design and manufacture of any straightening fixtures required.
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