Chemical milling works by immersing the metal part in a chemical solution that selectively dissolves the exposed areas. A mask or resist is applied to the surface to protect the areas that need to remain intact. The chemical solution, also known as an etchant, removes the unprotected material by breaking down the molecular structure of the metal. This process allows for precise control over the depth and shape of the cut.
The key to successful chemical milling is choosing the right etchant for the specific type of metal being processed. Different metals require different chemical solutions and processing parameters to achieve the desired results. Common etchants used in chem milling include acids such as hydrochloric acid, nitric acid, or sulfuric acid. Each acid has its own unique properties and is chosen based on the material being processed and the desired outcome.
Chemical milling is a versatile process that can be used to create intricate designs and complex shapes that may be difficult or impossible to achieve using traditional machining methods. The process can be used on a wide range of materials, including aluminum, stainless steel, titanium, and various alloys. Chem milling is particularly useful for parts with thin walls, delicate features, or tight tolerances.
Applications of chem milling