{"id":10565,"date":"2019-01-30T07:00:43","date_gmt":"2019-01-30T07:00:43","guid":{"rendered":"https:\/\/www.engineernewsnetwork.com\/blog\/?p=10565"},"modified":"2019-01-29T12:01:44","modified_gmt":"2019-01-29T12:01:44","slug":"how-stainless-steel-etching-works","status":"publish","type":"post","link":"https:\/\/www.engineernewsnetwork.com\/blog\/how-stainless-steel-etching-works\/","title":{"rendered":"How stainless steel etching works"},"content":{"rendered":"<span class=\"highlight highlight-blue\"><a href=\"https:\/\/www.engineernewsnetwork.com\/blog\/photo-chemical-etching-getting-the-measure\/\" target=\"_blank\" rel=\"noopener\">Chemical etching<\/a><\/span> produces precision components by selectively removing metal through a photo-resist mask.<\/p>\n<p>When compared with conventional sheet metalworking, it has a number of inherent advantages, key among which are its ability to produce parts without degrading material properties \u2013 no force or heat is used during processing \u2013 and almost limitless part complexity as component features are removed simultaneously using etchant chemistries.<\/p>\n<p>The tooling for etching is digital, so there is no need to start cutting expensive and difficult to adapt steel moulds. This means that large quantities of products can be reproduced with absolutely zero tool wear, ensuring that the first and millionth part produced are exactly the same.<br \/>\n<script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><br \/>\n<ins class=\"adsbygoogle\" style=\"display: block; text-align: center;\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\" data-ad-client=\"ca-pub-7565662001938327\" data-ad-slot=\"7585079586\"><\/ins><br \/>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><br \/>\nIn addition, digital tooling can be adapted and changed extremely quickly and economically (often within an hour), making it ideally suited to both prototype and high volume production runs. This allows for \u2018risk-free\u2019 design optimisation without financial penalty. Turnaround time is estimated to be 90% quicker than for stamped parts, stamping also requiring substantial upfront investment in mould fabrication.<\/p>\n<figure id=\"attachment_10567\" aria-describedby=\"caption-attachment-10567\" style=\"width: 300px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/www.engineernewsnetwork.com\/blog\/wp-content\/uploads\/2019\/01\/Figure-2LR.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-10567 size-medium\" src=\"https:\/\/www.engineernewsnetwork.com\/blog\/wp-content\/uploads\/2019\/01\/Figure-2LR-300x193.jpg\" alt=\"\" width=\"300\" height=\"193\" srcset=\"https:\/\/www.engineernewsnetwork.com\/blog\/wp-content\/uploads\/2019\/01\/Figure-2LR-300x193.jpg 300w, https:\/\/www.engineernewsnetwork.com\/blog\/wp-content\/uploads\/2019\/01\/Figure-2LR-768x494.jpg 768w, https:\/\/www.engineernewsnetwork.com\/blog\/wp-content\/uploads\/2019\/01\/Figure-2LR-1024x658.jpg 1024w, https:\/\/www.engineernewsnetwork.com\/blog\/wp-content\/uploads\/2019\/01\/Figure-2LR-800x514.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-10567\" class=\"wp-caption-text\">Often used in safety-critical or extreme environment applications, etched flexure springs have the ability to &#8216;flex&#8217; millions of times faultlessly as the process does not alter the fatigue strength of the steel<\/figcaption><\/figure>\n<p>The economy and adaptability of photo-etch tooling is a key stimulus to design freedom, along with its ability to produce complicated products. As the cost of creating prototypes is low there is no barrier to entry, and complex designs can be produced in a matter of days.<\/p>\n<p><strong>Etched stainless steel components<\/strong><\/p>\n<p>Etching is suited to pretty much any stainless steel component between 0.01mm and 1.5mm in thickness, but below are some example case studies of the more prevalent product groups where photo chemical etching stainless steel adds value.<\/p>\n<p><strong>Meshes, filters and sieves.<\/strong> Unlike conventional machining technologies, chemical etching offers greater levels of complexity when producing thin, precision steel meshes, filters, and sieves.<\/p>\n<p>With metal removed simultaneously when etched, multiple aperture geometries can be incorporated without incurring high tool or processing costs, and where punch-perforated sheets are prone to distortion, photo-etched mesh is burr and stress-free with zero material degradation.<\/p>\n<figure id=\"attachment_10568\" aria-describedby=\"caption-attachment-10568\" style=\"width: 300px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/www.engineernewsnetwork.com\/blog\/wp-content\/uploads\/2019\/01\/Figure-3LR.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-10568\" src=\"https:\/\/www.engineernewsnetwork.com\/blog\/wp-content\/uploads\/2019\/01\/Figure-3LR-300x200.jpg\" alt=\"\" width=\"300\" height=\"200\" srcset=\"https:\/\/www.engineernewsnetwork.com\/blog\/wp-content\/uploads\/2019\/01\/Figure-3LR-300x200.jpg 300w, https:\/\/www.engineernewsnetwork.com\/blog\/wp-content\/uploads\/2019\/01\/Figure-3LR-768x512.jpg 768w, https:\/\/www.engineernewsnetwork.com\/blog\/wp-content\/uploads\/2019\/01\/Figure-3LR-1024x683.jpg 1024w, https:\/\/www.engineernewsnetwork.com\/blog\/wp-content\/uploads\/2019\/01\/Figure-3LR-800x533.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-10568\" class=\"wp-caption-text\">Stainless steel speaker grilles with complex hole arrays and surface engraving are supplied by Precision Micro to automotive OEMs in quantities of multiple millions each year<\/figcaption><\/figure>\n<p>A 150-micron thick precision stainless steel mesh used in radiation detection devices is etched by Precision Micro to close tolerances \u2013 below the standard \u00b110% material thickness \u2013 and features a critical honeycomb shaped mesh array.<\/p>\n<p>Given the size of the mesh, more than 600mm x 600mm square, stamping was seen to be uneconomical due to the investment required in press tooling, and laser cutting could not achieve the required tolerances, especially over such as large surface area, and also produced undesirable burring around each mesh opening.<\/p>\n<p>Another benefit of etched stainless steel mesh is that the process does not alter the surface finish of the material \u2013 no metal-to-metal contact or heat source is used which can mar the surface \u2013 offering a highly aesthetic finish. Automotive speaker grilles with complex hole arrays and surface engraving are supplied by Precision Micro to automotive OEMs in quantities of multiple millions each year, the tooling too complicated for stamping and the mesh pattern too complex to laser cut.<\/p>\n<p><strong>Flat and flexure springs.<\/strong> Often used in safety-critical or extreme environment applications \u2014 such as ABS braking systems, medical biosensors, and fuel injection systems \u2014 etched flexures have the ability to \u201cflex\u201d millions of times faultlessly as the process does not alter the fatigue strength of the steel.<\/p>\n<p>Environments rarely come more extreme than space and this is why Thales Cryogenics, a leading manufacturer of specialised cryogenic equipment, partnered with Precision Micro for the manufacture of stainless steel flexures used in its satellite cryogenic cooler.<\/p>\n<p>Initially, Thales considered machining and wiring for its flexures before turning to chemical etching, but both processes were seen to leave small burrs and recast layers on the parts which would have compromised spring performance.<br \/>\nChemical etching eliminated potential fracture sites in the material grain, producing flexures free from burrs and recast layers, ensuring a longer product life and higher reliability.<\/p>\n<p><strong>Fuel cells, cooling plates and fluidic devices.<\/strong> Stainless steel grades with increased levels of chromium are well suited to fluidic devices used for liquid-to-liquid or liquid-to-gas heat exchangers, fuel cells, and cooling plates, as they offer higher levels of corrosion resistance.<\/p>\n<p>The complex grooves machined into the surface of these plates \u2014 which are subsequently stacked and bonded to create captive channels \u2014 are well suited to chemical etching as they can be machined onto both sides in a single process.<\/p>\n<p>While CNC machining and stamping can be used to machine and profile these channels they can compromise flatness and introduce stresses and burrs. Presswork tooling can also be slow and uneconomic alto produce, slowing down and adding cost to development timelines.<\/p>\n<p>Chemical etching is the principle technology used to produce printed circuit heat exchanger plates (PCHEs) for petrochemical processing. By combining etching and diffusion bonding, PCHEs are up to 85% smaller and lighter than traditional shell and tube technology.<\/p>\n<p>Bi-polar fuel cell plates etched by Precision Micro powered the zero-emission black cabs used to transport dignitaries during the London 2012 Olympic games.<\/p>\n<p><strong>Summary<\/strong><\/p>\n<p>Steel and stainless steels exhibit an array of characteristics that make it ideally suited for numerous pan-industrial applications. While seen as a relatively simple material to process through traditional sheet metalworking technologies, photo chemical etching offers manufacturers significant advantages when producing complex and safety critical components.<\/p>\n<p>Etching requires no hard tooling, allows speedy ramp up from prototype volumes to high volume manufacture, offers almost unlimited part complexity, produces burr- and stress-free components, does not affect metal temper and properties, is appropriate for all grades of steel, and achieves accuracy to \u00b10.025 mm, all at lead times measured in days, not months.<\/p>\n<p>The versatility of the photo chemical etching process makes it a compelling option for the manufacture of stainless steel parts across numerous exacting applications, and stimulates innovation as it removes obstacles for design engineers inherent in traditional sheet metalworking technologies.<\/p>\n<p>As a leading photo chemical etching specialist for over 50 years, <span class=\"highlight highlight-blue\"><a href=\"http:\/\/www.precisionmicro.com\" target=\"_blank\" rel=\"noopener\">Precision Micro<\/a><\/span> has developed etchant chemistries and processes that make etching possible on a wide range of metals.<\/p>\n<p>Stainless steel, however, remains the number one choice for many of the company\u2019s customers due to its versatility, the numerous grades available, and the vast array of finishes.<\/p>\n<p>Precision Micro etches more than two million steel and stainless steel components each month, making it the largest sheet etching company in Europe.<\/p>\n<p>Its stock steel grades include austenitic (300) and ferritic martensitic (400) series, mild steel, electrical steel, maraging steel, high-carbon (spring) steel, precipitation hardened (17-4, 17.7) steel, and duplex and super duplex steel, as well as specialist grades including Sandvik Chromflex strip steels and Uddeholmstrip flapper valve steel.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Chemical etching produces precision components by selectively removing metal through a photo-resist mask. When compared with conventional sheet metalworking, it has a number of inherent advantages, key among which are its ability to produce parts without degrading material properties \u2013 no force or heat is used during processing \u2013 and almost limitless part complexity as &hellip;<\/p>\n","protected":false},"author":1,"featured_media":10566,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[105],"tags":[4006,386,5605],"class_list":["post-10565","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-design","tag-chemical-etching","tag-precision-micro","tag-stainless-steel-etching"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How stainless steel etching works - Engineer News Network<\/title>\n<meta name=\"description\" content=\"Chemical etching produces precision components by selectively removing metal through a photo-resist mask\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.engineernewsnetwork.com\/blog\/how-stainless-steel-etching-works\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How stainless steel etching works - 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