What are the processes of precision casting?
Investment casting, also known as lost wax casting or precision casting, is an ancient casting technology that still occupies an important position in modern manufacturing due to its high precision and excellent surface quality. Today, we will take you to appreciate the charm of investment casting, and through a series of exquisite illustrations, we will take you into the world of precision casting art and craftsmanship.
The basic principle of investment casting is to first make an investment mold (wax pattern) according to the product drawing design, and then apply refractory materials multiple times and dry and solidify to form a strong ceramic shell. Next, the ceramic mold shell is heated until the wax pattern melts and flows out, forming a mold cavity. Finally, molten metal is injected into the mold cavity. After the metal cools and solidifies, the ceramic shell is broken and the casting is removed. Throughout the process, the wax pattern serves as a temporary core, while the ceramic shell becomes the exterior shape of the casting.
Wax model making
Wax patterning is one of the key steps in investment casting. Modern investment casting uses 3D printing technology to produce wax patterns, which can quickly and accurately produce wax patterns of complex shapes. During the wax model making process, parameters such as temperature and humidity need to be strictly controlled to ensure the quality and accuracy of the wax model.
Ceramic shell production
Ceramic mold shell is another important link in investment casting. Workers need to apply refractory materials on the surface of the wax mold multiple times, and go through steps such as drying and curing to form a strong ceramic shell. The thickness and uniformity of the ceramic mold shell have a great impact on the quality of the casting, so various parameters during the production process need to be strictly controlled.
- Investment melting and metal injection
In the investment melting stage, the ceramic mold shell is heated until the wax pattern melts and flows out, forming a mold cavity. Then, molten metal is injected into the cavity. After the metal cools and solidifies in the mold cavity, the casting is formed. In this process, it is necessary to control the temperature, flow rate and other parameters of the metal to ensure the quality and performance of the casting.
- Casting demoulding and post-processing
When the casting has completely cooled and solidified, the ceramic shell can be broken and the casting removed. Castings need to undergo post-processing steps such as grinding and cleaning to remove surface burrs, oxides and other impurities. Finally, the castings that pass the quality inspection can be delivered to the customer.
Through the introduction and accompanying pictures of the above five steps, I believe you will have a deeper understanding of investment casting. Investment casting is widely used in aviation, aerospace, automotive and other fields due to its high precision and excellent surface quality. In the future, with the continuous advancement and innovation of technology, investment casting will show its unique charm and value in more fields.
