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You can change your ad preferences anytime. Chemical machining. Upcoming SlideShare. Like this presentation? Why not share! Embed Size px. Start on.
Show related SlideShares at end. WordPress Shortcode. Published in: Engineering. Full Name Comment goes here. Are you sure you want to Yes No. Show More. Sayeed Khan. Muhammad Ali. Akhil Nanduri. No Downloads. Views Total views. Actions Shares. Embeds 0 No embeds. No notes for slide. Chemical machining 1. Chemical machining 3. What is Chemical machining CHM? PEI has perfected the Chemical Machining process, starting with the creation of phototools from a fully-dimensional drawing or CAD file supplied by the customer.
History of the chemical machining processs. The development of photography provided a new dimension to chemical machining. Steps of chemical machining Chemical machining process has several steps for producing machine parts. These are given below: 1- Workpiece preparation: The workpiece material has to be cleaned in the beginning of chemical machining process.
Scribing of the mask: This step is guided by templates to expose the areas that receive chemical machining process. The selection of mask depends on the size of the workpiece material, the number of parts to be produced, and the desired detail geometry. Silk-screen masks are preferred for shallow cuts requiring close dimensional tolerances. Etching micro fabrication 4. Then the etched workpiece is rinsed to clean etchant from machined surface.
The inspections of the dimensions and surface quality are completed before packaging the finished part. Tough enough to withstand handling 2.
Well adhering to the workpiece surface 3. Easy scribing 4. Inert to the chemical reagent used 5. Able to withstand the heat used during chemical machining 6. Easy removal after chemical machining etching Chemical milling 1. In chemical milling, shallow cavities are produced on plates, sheets, forgings and extrusions. The two key materials used in chemical milling process are etchant and maskant. Etchants are acid or alkaline solutions maintained within controlled ranges of chemical composition and temperature.
Maskants are specially designed elastomeric products that are hand strippable and chemically resistant to the harsh etchants. Chemical milling is used in the aerospace industry to remove shallow layers of material from large aircraft components missile skin panels extruded parts for airframes.
Figure 2 : parts profiled by chemical blanking process Chemical Engraving Chemical Engraving is the practice of incising a design on to a hard, usually flat surface, by cutting grooves into it. The result may be a decorated object in itself, as when silver, gold, steel or glass are engraved, or may provide an printing plate, of copper or another metal, for printing images on paper as prints or illustrations; these images.
It is limited materials 0. Metals include aluminium, brass, copper, inconel, manganese, nickel, silver, steel, stainless steel, zinc and titanium Video shows PCM Photoresist is the masking material that is sensitive to light. You just clipped your first slide!
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Manufacturing - Chemical Machining
The process starts by cleaning the dirt and oils from the metal. A photoresist is applied and baked to assure an even application. The artwork is then placed over the prepared sheet of metal and exposed to ultra-violet light, resulting in the desired resolution and etch specs. The artwork is removed and the resist is ready to be developed or removed. At this point the metal is ready to be etched by submerging the sheet in a chemical solution that dissolves all the material that is not integral to the part. After the etching is completed the resist is removed and the metal parts are cleaned, inspected and packaged. MegaRoller, Inc.