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Melt wax into the center hole and then either add a sprue or attach wax models right to the dome base. A must have for casting gold, silver and precious. Direct investment casting, or lost wax casting, is a popular If a printed part is difficult to sprue, use epoxy or superglue to attach. of a length that will permit the investing heating and casting of the gold. This The sprue wire holding the wax form. MGMBET

Place thicker parts at the bottom and thinner parts at the top of the tree. Space 3D printed pieces further apart on the tree than typical for a tree of wax pieces. More investment in the gaps between parts helps resist any thermal expansion. Tips for creating a casting tree Use wax sprues for main sprues and large feeds. If using wax sprues, create the thickest sprues possible, and place the sprues on the thickest part of the model as long as the sprues do not interfere with the design. For printed sprues, match the sprue diameter to the cross-section of the adjacent part for even expansion during the cast.

Whether using wax sprues or sprues printed directly on the part, place sprues for the shortest exit path of material. Make the path of airflow inside the cast as short as possible. Smaller trees with less resin burn out more easily.

Casting barrier films may interfere with the ability of the resin to lose liquid wax during heating. Add ventilation holes within the design to ensure sufficient airflow during burnout. Close these holes with wax before adding sprues to avoid the investment getting inside the model. Castable Wax 40 Resin will give you more freedom in investment materials.

If you are casting especially difficult designs, consider upgrading to a stronger phosphate bonded investment material, such as Nobilium Microfire. Tip: Large or thick parts benefit from a stronger investment. When casting bulkier parts, adjust the ratio of water in the investment mixture. The workflow for mixing the investment and preparing the mold depends on the investment and flask size.

Follow the investment manufacturer's instructions and adjust the burnout schedule as needed. Warning: Follow safety recommendations from the investment manufacturer. Step 1: Attach a casting flask Attach a casting flask to the sprue base. If the flask is perforated, wrap the flask with clear packing tape to contain the investment. Mix with a slow speed until the powder is completely wet. Casting result according to shape. References J. Ha, "A study of investment casting process for improving of the mechanical properties" Pukyong National Univ.

Lee, "A study on quality improvement of silver jewelry in lost wax casting" Kookmin Univ. Kim, "A study on the ornaments design using precision casting techniques" Keimyung Univ. Jung, "Study on the technological solution of jewelry foundry defect in alloy precious metals" Kaya Univ. Korea, p. Suhas V. Kim "Numerical analysis of an axisymmetric turbulent rotating flow in an arbitrary geometry" Chonnam Univ. Ahn and J. Lee, "Study on phosphate investment for high temperature precision castings I ; The effect of particle size and distribution of silica sand on the characteristics of the investment", J.

Korea Foundry Society 5 Yun, "Process analysis forprocess design of precision casting of metal" Chungnam National Univ.

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