Lost-wax precision casting has the characteristics and advantages that the traditional casting, forging, and mechanical cutting molding methods do not have. It is suitable for any material and has the ability to produce more flexible mass production. Therefore, the application of lost-wax casting covers a wide range, from heaven to earth. Aircraft, vehicles on the ground, ships at sea, various industrial machinery and equipment and leisure art supplies can be produced.

The use of lost-wax precision casting is that it can manufacture thin-walled parts, complex-shaped parts, fine-patterned parts, complicated parts, difficult-to-cut parts, net-shaped parts, expensive parts, and several parts. Dimensional accuracy and surface gloss are good. Especially for odd-shaped, hollow and complex parts that are difficult to manufacture by traditional sand casting, forging or cutting methods, and although they can be manufactured by forging, cutting, etc. It will consume a lot of metal materials, resulting in parts with high manufacturing cost. Switching to lost wax casting can achieve the purpose of short construction period and low cost.

For parts with fine patterns, fine grooves and curved fine holes, it can also save the time and cost of electrical discharge machining and laser engraving. In addition, the use of lost wax investment casting method is most suitable for the production of net shape (Net Shape) parts, which can greatly reduce the weight of parts, and can also cast several parts into one, reduce weight, improve mechanical properties and dimensional accuracy, and reduce processing hours and costs.

The following issues should be paid attention to in the operation process of planting wax trees.

1) There is generally a 45° angle between the wax model water channel of the wax tree and the wax stick, that is to say, the direction of the wax model is inclined upward. Only in this way can the gold water be injected into the plaster mold smoothly. This angle can be adjusted appropriately according to the size and complexity of the wax model. Small and complex wax models can reduce the included angle; on the contrary, larger wax models can increase the included angle.

2) Before planting wax trees, the rubber chassis should be weighed first. After the wax tree is planted, it is weighed again. The weight of the wax tree can be calculated by subtracting the results of these two weighings. Converting the weight of the wax tree to the weight of the metal by the ratio of the density of the paraffin to the cast metal gives an estimate of how much metal is needed for casting.

3) After planting the wax tree, it is necessary to check whether the wax model has been welded firmly. If it is not welded firmly, it is easy to cause the wax mold to fall off when pouring plaster, which affects the casting process. Finally, it should be checked whether there is enough space between the wax models. If the wax models are attached together, they should be separated; if there are dripping wax drops on the wax tree, they should be trimmed with a blade.

Shell type

The baking of wax mold is an important process to ensure the normal operation of casting. Generally speaking, the mold baking time for 18K gold is 6 to 12 hours, and the mold baking time for platinum is 12 to 20 hours. The main functions of baking are: dewaxing, drying and casting insulation. Taking the baking of 18K gold as an example, the dewaxing temperature is 0~350℃, and the holding time is 2 hours; the drying temperature is 350~700℃, and the holding time is 2~3 hours; the casting temperature is 600~500℃, and the holding time is 1~3 hours. 2 hours.