{"id":3309,"date":"2021-04-29T22:14:00","date_gmt":"2021-04-30T03:14:00","guid":{"rendered":"https:\/\/sybridge.com\/?p=3309"},"modified":"2025-05-28T14:38:57","modified_gmt":"2025-05-28T19:38:57","slug":"five-design-tips-for-urethane-casted-parts","status":"publish","type":"post","link":"https:\/\/sybridge.com\/five-design-tips-for-urethane-casted-parts\/","title":{"rendered":"Five Design Tips for Urethane Casting"},"content":{"rendered":"\n<p class=\"has-sm-font-size\"><em>Originally published on fastradius.com on April 29, 2021<\/em><\/p>\n\n\n\n<p><a href=\"\/technologies\/urethane-casting\/\">Urethane casting<\/a>&nbsp;is a versatile traditional manufacturing process that uses a 3D-printed master pattern and a silicone mold to create end-use plastic parts. During the&nbsp;urethane casting process, the master pattern is placed inside a sealed box, covered with liquid silicone, and then cured. After the silicone has set, a manufacturer cuts it in half to release the master pattern \u2014 at this point, the cast urethane mold is ready for use.<\/p>\n\n\n\n<p>To create custom cast urethane parts, engineers pour urethane casting resin \u2014 typically a polyurethane material that can mimic the physical properties of the plastic used in&nbsp;<a href=\"\/technologies\/injection-molding\/\">injection molding<\/a>&nbsp;\u2014 into the mold and cure it in an oven. The final part generally requires little, if any, post-processing.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"667\" src=\"https:\/\/sybridge.com\/wp-content\/uploads\/2023\/08\/shutterstock_669023848-1.jpg\" alt=\"Urethane Casting\" class=\"wp-image-3402\" srcset=\"https:\/\/sybridge.com\/wp-content\/uploads\/2023\/08\/shutterstock_669023848-1.jpg 1000w, https:\/\/sybridge.com\/wp-content\/uploads\/2023\/08\/shutterstock_669023848-1-300x200.jpg 300w, https:\/\/sybridge.com\/wp-content\/uploads\/2023\/08\/shutterstock_669023848-1-768x512.jpg 768w, https:\/\/sybridge.com\/wp-content\/uploads\/2023\/08\/shutterstock_669023848-1-600x400.jpg 600w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n<\/div>\n\n\n<p>Less expensive and less time-consuming than&nbsp;hard tooling, urethane casting is ideal for&nbsp;<a href=\"https:\/\/sybridge.com\/capabilities\/\">rapid prototyping<\/a>&nbsp;and low- to medium-volume production runs of complex builds. To get the most out of this manufacturing process, product teams must design for manufacturability and&nbsp;optimize mold design&nbsp;early on to streamline the production process and keep costs low. Here are five essential design tips for creating clean and functional custom cast urethane parts:<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-5-top-design-tips-for-urethane-casting\">5 Top Design Tips for Urethane Casting<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-give-even-wall-thickness\">1. Give even wall thickness<\/h3>\n\n\n\n<p>Many engineers&nbsp;prefer urethane casting over injection molding&nbsp;because the former process affords greater variation in wall thicknesses, but it\u2019s still important to ensure that a given urethane mold design features uniform walls. Uniform walls reduce the risk of deformation during curing, ensure the mold will be filled completely and accurately, and mitigate other design issues.<\/p>\n\n\n\n<p>A minimum wall thickness of .040\u201d (1mm) is recommended, but there are cases in which walls may be as thin as .020\u201d(.5mm) in small parts. For larger parts, wall thickness should always increase in proportion to the size of the part to guarantee that the walls can provide adequate support.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-account-for-shrinkage\">2. Account for shrinkage<\/h3>\n\n\n\n<p>When two walls with different thicknesses intersect in a urethane mold design, shrinkage can occur. Since thicker walls solidify slower than thinner walls, the area to which they are attached at the nominal wall will shrink as the projection \u2014 a rib or a boss \u2014&nbsp; shrinks. This causes a sunken area in the nominal wall. To minimize shrinkage and prevent sunken areas, engineers should ensure rib thickness falls between 50% and 60% of the walls to which they\u2019re attached.<\/p>\n\n\n\n<p>Still, sometimes urethane casted parts shrink for reasons other than a urethane mold design flaw. The final dimensions of a urethane casted part depends on the accuracy of the master pattern and mold,\u00a0<a href=\"https:\/\/sybridge.com\/complex-geometries\/\">part geometry<\/a>, as well as\u00a0<a href=\"https:\/\/fastradius.com\/resources\/cast-urethane-materials\/\">urethane casting materials<\/a>. A shrinkage rate of 0.15% is considered acceptable, but engineers should revisit their urethane mold design if the shrink rate surpasses this threshold.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-employ-ribs\">3. Employ ribs<\/h3>\n\n\n\n<p>Adding ribs to a urethane mold design can increase the end part\u2019s strength and rigidity without adding thickness. To use ribs properly, engineers should adhere to the following guidelines:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-height\">Height<\/h4>\n\n\n\n<p>Longer ribs provide greater reinforcement, but casting a long rib can make the part difficult to mold. For this reason, a rib shouldn\u2019t exceed a height that\u2019s three times its thickness. To avoid the height issue altogether, engineers can use multiple short ribs instead of one long rib to increase the stiffness of the part.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-width\">Width<\/h4>\n\n\n\n<p>The width of the rib at the intersection of the part should be 40% to 60% of the thickness of the part. If a fillet radius is included in the design, it should be at least 25% of the thickness of the part. These parameters help make the rib as strong as possible.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-draft-angle\">Draft Angle<\/h4>\n\n\n\n<p>Engineers must draft a rib designed to reduce the possibility of sinking. Draft angles for each side should be between 0.25 and 0.5 degrees and the draft angle of each side should be equal. For textured surfaces, add an additional 1.0 degree draft for every 0.025 (0.001 inch) depth of texture.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-spacing\">Spacing<\/h4>\n\n\n\n<p>Engineers should set consecutive ribs at least two times the thickness away from each other to evenly distribute the part\u2019s weight across all ribs.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-orientation\">Orientation<\/h4>\n\n\n\n<p>Rib orientation determines how and where the part experiences stress, so engineers should be careful to arrange ribs in a way that maximizes the bending stiffness of the part. If the ribs are placed in the wrong position, they won\u2019t have any positive impact on the part\u2019s strength.<\/p>\n\n\n\n<p>Product teams should also be mindful of intersections and sinking when working with ribs. At the point where a rib intersects with the part, a heavy rib can cause the part to dip. To avoid sinking at the rib intersection, engineers can use fillets to ease the stress on the part\u2019s surface and reduce sink on the opposite side of the part. The radii of the fillets should be at least a quarter of the thickness of the part. Further, coring or&nbsp;<a href=\"\/lightweighting-benefits\/\">lightweighting<\/a>&nbsp;the part reduces the amount of material used and helps maintain a uniform wall thickness throughout the part.<\/p>\n\n\n\n<p>Ribs can dramatically improve an end-part\u2019s performance, but engineers and product teams shouldn\u2019t get carried away. Ribs are only useful when the part requires extra reinforcement. In situations where this isn\u2019t the case, ribs are often placed improperly and do little to improve the strength or rigidity of the part. Also, unnecessary ribs increase the weight and price of the part, cause molding problems, and contribute to material waste. Engineers and product teams should keep these considerations in mind when deciding whether or not their urethane mold design requires a rib.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-consider-drafts-and-undercuts\">4. Consider drafts and undercuts<\/h3>\n\n\n\n<p>Drafts and undercuts are not a concern with urethane casting because liquid silicone can take the shape of any mold. However, if an engineer is using urethane casting to build a prototype that will eventually be manufactured using a different process, like injection molding, they should create the design as intended for end-use production. This might include incorporating&nbsp;drafts&nbsp;and&nbsp;undercuts. Long zero-draft features come with a slight risk of part breakage when extracting the part from the mold, so a slight angle may be useful, especially for larger production runs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-5-include-enough-spacing-between-letters-and-logos\">5. Include enough spacing between letters and logos<\/h3>\n\n\n\n<p>With urethane casting, it\u2019s easy for designers to mold high-quality raised or recessed letters and logos into custom cast urethane parts. To make sure letters are as beautiful and readable as possible, designers should keep height or feature depth, feature width, radii on the feature, and the space between features in mind.<\/p>\n\n\n\n<p>Product teams should leave at least 0.050\u201d between features, though this can vary depending on the particulars of the design. All radii should be at least equal to half the feature height, but larger radii are even better. Finally, the width of all logos or letters should be twice their height.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"667\" src=\"https:\/\/sybridge.com\/wp-content\/uploads\/2023\/08\/shutterstock_1145005757-1.jpg\" alt=\"Urethane Casting\" class=\"wp-image-3401\" srcset=\"https:\/\/sybridge.com\/wp-content\/uploads\/2023\/08\/shutterstock_1145005757-1.jpg 1000w, https:\/\/sybridge.com\/wp-content\/uploads\/2023\/08\/shutterstock_1145005757-1-300x200.jpg 300w, https:\/\/sybridge.com\/wp-content\/uploads\/2023\/08\/shutterstock_1145005757-1-768x512.jpg 768w, https:\/\/sybridge.com\/wp-content\/uploads\/2023\/08\/shutterstock_1145005757-1-600x400.jpg 600w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><figcaption class=\"wp-element-caption\"><em>In addition to being an ideal process for creating parts with lettering or logos, urethane casting is also a smart option for prototyping components.<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-optimize-your-urethane-casted-parts\">Optimize Your Urethane Casted Parts<\/h2>\n\n\n\n<p>With urethane casting and designing for manufacturability, a few small design alterations go a long way. Engineers and designers should seek to maintain uniform wall thicknesses, account for shrinkage, and ensure they\u2019re using ribs effectively. Product teams can further optimize manufacturability by creating designs as they are intended for end-use production and making sure they leave enough space in between letters and logos to boost aesthetics.<\/p>\n\n\n\n<p>An experienced manufacturing partner like SyBridge can help product teams simplify designing for manufacturability. We\u2019re passionate about developing products that were once thought impossible to make, and we make it a point to keep up with the latest digital design technologies.<\/p>\n\n\n\n<p>Product teams looking to develop a breakthrough application or optimize an existing urethane mold design can benefit from our design team\u2019s years of experience across manufacturing processes.&nbsp;<a href=\"\/contact\/\">Contact us<\/a>&nbsp;today to get started on your custom cast urethane parts.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Originally published on fastradius.com on April 29, 2021 Urethane casting&nbsp;is a versatile traditional manufacturing process that uses a 3D-printed master pattern and a silicone mold to create end-use plastic parts. During the&nbsp;urethane casting process, the master pattern is placed inside a sealed box, covered with liquid silicone, and then cured. After the silicone has set, [&hellip;]<\/p>\n","protected":false},"author":20,"featured_media":3400,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[38],"tags":[83],"class_list":["post-3309","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles","tag-urethane-casting"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Five Design Tips for Urethane Casting - SyBridge Technologies<\/title>\n<meta name=\"description\" content=\"Urethane casting\u00a0is a versatile traditional manufacturing process that uses a 3D-printed master pattern and a silicone mold to create end-use plastic parts\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sybridge.com\/five-design-tips-for-urethane-casted-parts\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Five Design Tips for Urethane Casting - 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