Photochemical Machining

Synopsis  Photochemical Machining For Electronics Photochemical Machining For Electronics  Photochemical Machining and Etching Processes Photochemical Machining and Etching Processes  How Photo Etching Works How Photo Etching Works  Chemical Etching of Surgical Saw Blades Chemical Etching of Surgical Saw Blades

Photochemical Machining For Electronics Photo-etched microelectronic parts are usually shiny and can at times look chrome plated, flat and dull. It might take any of the mentioned forms depending on the photo-etching process it has undergone. However, you can get regular photo-etched parts that can be attached to frames. This type is quite easier to make and also remarkably less expensive than the rubber-backed parts. But note that, it's a lot harder to work with compared to the rubber-backed parts that are far easier to remove, very expensive and also difficult to come across. When it comes to QFN and LD-MOS leadframes, photo etching is guaranteed to do the perfect magic and not just on it alone but also on other custom platforms too. As a result of its amazing low attenuation loss, the QFN otherwise known as "air-cavity" packages are perfect for use in RF and microwave communications applications. Due to its complex and also fragile designs, the leadframes are just perfect for the capabilities of chemical etching. photofabrication.com

Photochemical Machining and Etching Processes The first step towards photo-chemical machining process is the manufacturing of a photo-tool, this can be achieved by using a laser photo plotter to selectively expose a photographic film based on computer-aided design data. The next step involves the selection and preparation of the metal for photochemical etching. In order to ensure that the metal has good adhesion to the photoresist, the sheet metal has to be thoroughly cleaned with electrolytic alkaline, the cleaning process makes the metal free from dirt, grease, rust, and oil thus making it possible for it to be laminated with the photo-resist. After undergoing lamination, the surface of the metal which has now been covered with photo artwork will then be exposed to a UV source. After this process you will realize that the un-exposed negative working photo-resist will be washed away, leaving only the exposed photoresist on the surface to produce the required protective layer for the etching process. photofabrication.com

How Photo Etching Works Let's look at it this way when engineers receive either of the following drawings, sketches, or electronic files, the first thing they do is make use of the CAD software to produce a pattern of repeated part designs. During this process, the repeated designs are laser plotted on the photographic film, thereby producing a “photo tool.” This tool has the capacity to hold a countless number of images although this capability is entirely dependent on the part size. Then the next step involves using the UV light and photo tool to send the images to a photoresist which is primarily a photosensitive polymer. The photoresist, therefore, covers the sheet of material. However note that, while this process is ongoing photoresist that notices UV light is instantly polymerized thereby leaving resist that is in unclear areas of the photo tool uncured. photofabrication.com

Chemical Etching of Surgical Saw Blades This machining method of saw blade production is less expensive than the stamping, punching, laser and waterjet cutting method. And not just that, it also has numerous benefits too that includes; shaping, blade tooth offset, surface marking of graduation lines, logos and insignias among others. And the interesting thing is that all these benefits can be achieved in its smoothest and best forms without any burr within a short period of time and also at a low cost. Chemical etching is economical when compared to other traditional methods like stamping because of the fact that, it primarily relies on digital tooling which is far more economical than the hard tooling that the stamping method is known for. When it comes to the iteration of designs, this is one area where you will appreciate the beauty of the photo-chemical etching method. This is because of its ability in an iteration of design prototype in a single sheet at no extra cost. photofabrication.com

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