1. Mold making: use software to process the mold into a hollow structure: greatly reduce the consumption of resin raw materials and save a lot of costs; The expansion problem of resin in the post treatment process is basically eliminated; It greatly reduces the amount of ash remaining in the mold removal step. Dried resin: if the wall thickness of the part is greater than 1.5mm, the thermal expansion will damage the shell. Therefore, the resin flow inside the hollow structure of the part must be clean. Cleaning: Try not to let the solvent flow into the parts, otherwise the parts may lose strength. Recommended solvent: 1. Preferably: clean with TPM (tripropylene glycol methyl ether) and rinse with IPA (isopropanol). 2. Industrial alcohol. Post curing: Place the parts in the UV light box for about 30 minutes, which can not only cure the uncured resin on the surface of the parts, so that the parts will not stick to the hands, but also make the parts more solid and more stable in size. Grinding: the inclined surface caused by the molding method will have small step marks, which generally need to be polished. Since the mold used for casting is hollow structure and the wall is very thin, be careful when grinding. Very smooth surface quality can be obtained after grinding. Check the airtightness: check the airtightness by slightly vacuuming, and it is not easy to damage the mold. Install the vent hole: (the necessary step is the key to the success of the following steps) Use the casting wax to make a wax rod with a diameter of about 6mm and a length of 50mm, and then glue it to the mold. Wax for common casting: SL mold can be directly "welded" on the runner with wax, and the assembly is the same as the normal wax mold, considering the way to remove the SL mold. The gate design can be larger than the wax type, which helps air enter the combustion mold.

    2. Shell making: Before hanging the first layer of slurry, when cleaning the wax tree, pay attention to observe whether there are bubbles. If yes, it indicates that the sealing property of the mold is not good. The wax tree shall not be damaged by buoyancy when immersed in the slurry.

    3. Dewaxing: prepare the vent made of wax rod on the piercing die before dewaxing; Remove the shell at the top of the wax rod; Expose the wax burning iron wire for ventilation hole; There are many ways to burn through wax and dewax the inner shell skin. The methods and equipment required are as follows: 1. Hot water wax removal - water tank with wax collection function 2. Steam wax removal - electrothermal integrated dewaxing kettle 3. Wax removal in the baking furnace - different methods and equipment are used for different furnaces with wax collection device. The simplest method is hot water wax removal, which can be done with only one hot water tank and is completely manual operation.

If not handled properly, the shell may expand during dewaxing. The wax tree and gate can be printed by 3D printing. The whole part after the tree formation does not contain wax, so the step of dewaxing can be skipped.

    4. Remove the mold: The mold cannot be melted like wax! Plenty of air must be introduced to burn it clean at high temperature! Please ensure that sufficient air is introduced into the furnace, as shown in the figure, which can greatly increase the success rate. All kinds of stoves are OK. It is recommended to use electric energy stoves. The mold removal temperature shall be maintained at 800 ℃ - 1100 ℃ for two hours. According to the part size, extend the time appropriately.

    5. Ash removal: After the model is cooled to room temperature, the following methods can be used to remove the ash in the shell: simple method: blow with compressed air. Reliable method: wash with water. If you wash with water, you need to plug the vent hole with a grinding stick or wax in advance. Pour 1/3 volume of water, shake and then pour out.

    6. Preheating and casting: before preheating, plug the vent with ceramic rod, refractory mud and other materials.

    7. For precision casting blanks, machining processes mainly include turning, milling, grinding, pliers, drilling, boring, and planing, as well as surface treatment, heat treatment, wire cutting, and other methods to make the overall dimensions of the workpiece meet the requirements of the design drawings.