Photo Chemical Machining (PCM) is an important process in the production of precise parts, mainly sheets and foils.
Coating the metal sheet with photoresist sensitizes it. When this sensitized metal is put into the double-sided Photo-tools and is subsequently exposed to UV light on both sides, an image is formed in the photoresist layer. Then it is developed in a liquid formulation to form an adherent durable image on both sides of the metal.
Various methods exist for the production of Photo-tools. The most commonly used method is to produce a Photo-tool of the correct size by using a laser photo-plotter to selectively expose a photographic film according to computer-aided design data. Photoresists are polymers that are sensitive to UV illumination. The etching is performed by an acid cocktail that attacks the surface of the raw material on both sides. Before coating the metal with photoresist, the metal is thoroughly cleaned to remove all dirt, rust, greases and oils so that a good adhesion to the photo-resist is obtained. The final stages of the PCM process is to strip off the resist, to ensure that the metal is clean and that the dimensional specifications requested have been actually fulfilled .
The PCM process enables the production of parts with complex geometric shapes, without necessitating large tooling costs for small prototype runs. Chemograf produces metal parts in thicknesses ranging from 0.01 mm (0.0004”) to 1.5 mm (0.06”) and in a wide selection of materials.
Advantages of Photo Chemical Machining
Retention of mechanical properties
Step – and – repeat of design
Tooling changes at a minimum cost
Excellent for complex geometric shapes
Excellent for small prototype runs.
Photo Chemical Machining Technical Details:
Part Size: 0.5mm to 600X800mm
Thickness of Material: (0.01-1.5) .0004″- .060″
Tolerance: 10%T not less then +-0.02 mm