{"id":7689,"date":"2026-10-16T07:52:19","date_gmt":"2026-10-16T07:52:19","guid":{"rendered":"https:\/\/www.lyafs.com\/?page_id=7689"},"modified":"2026-10-16T07:57:49","modified_gmt":"2026-10-16T07:57:49","slug":"low-pressure-casting","status":"publish","type":"page","link":"https:\/\/www.lyafs.com\/fr\/services\/low-pressure-casting\/","title":{"rendered":"Low Pressure Casting"},"content":{"rendered":"<main id='oxy-main'><section class=\"oxy-container-7689-124 oxy-container lyafs-hero lyafs-hero--lead\"><div class=\"oxy-container-7689-123 oxy-container lyafs-inner lyafs-hero-grid\"><div class=\"oxy-container-7689-101 oxy-container lyafs-hero-media\"><img decoding=\"async\" class=\"oxy-image-7689-100 oxy-image\" src=\"https:\/\/www.lyafs.com\/wp-content\/uploads\/2026\/10\/lp-machine.jpg\" alt=\"Low pressure casting machine at the foundry, riser tube and sealed furnace\" loading=\"lazy\"><\/div><span class=\"oxy-text-7689-102 oxy-text lyafs-kicker\">\nLow pressure casting service\n<\/span><h1 class=\"oxy-text-7689-103 oxy-text lyafs-h1\">\nLow pressure casting for pressure-tight aluminium parts, without a die\n<\/h1><div class=\"oxy-container-7689-122 oxy-container lyafs-hero-text\"><div class=\"oxy-container-7689-108 oxy-container\"><p class=\"oxy-text-7689-104 oxy-text lyafs-lede\">\nLow pressure casting fills the mould from below, pushing metal up a riser tube with nothing more than dried compressed air. The fill is slow and laminar, the riser keeps feeding as the part freezes, and the result is a dense, pressure-tight casting with almost no feeder metal to cut off. We run it into printed sand moulds, so there is no die and no pattern \u2014 a single switchgear housing is a normal order.\n<\/p><div class=\"oxy-container-7689-107 oxy-container lyafs-cta-row\"><a class=\"oxy-text-link-7689-105 oxy-text-link lyafs-btn\" href=\"\/fr\/get-a-quote\/\" target=\"_self\">\nSend your drawing for a quote\n<\/a><a class=\"oxy-text-link-7689-106 oxy-text-link lyafs-btn lyafs-btn--ghost\" href=\"#cases\" target=\"_self\">\nSee the documented cases\n<\/a><\/div><\/div><aside class=\"oxy-container-7689-121 oxy-container lyafs-panel\"><h3 class=\"oxy-text-7689-109 oxy-text\">\nLow pressure at a glance\n<\/h3><ul class=\"oxy-container-7689-120 oxy-container lyafs-deflist\"><li class=\"oxy-container-7689-111 oxy-container\"><div class=\"oxy-text-7689-110 oxy-text\">\n<b>8<\/b> \u2014 low pressure casting machines in the casting lines\n<\/div><\/li><li class=\"oxy-container-7689-113 oxy-container\"><div class=\"oxy-text-7689-112 oxy-text\">\n<b>1 t<\/b> \u2014 largest single aluminium pour\n<\/div><\/li><li class=\"oxy-container-7689-115 oxy-container\"><div class=\"oxy-text-7689-114 oxy-text\">\n<b>20 jours<\/b> \u2014 documented small-batch delivery, printed mould to finished part\n<\/div><\/li><li class=\"oxy-container-7689-117 oxy-container\"><div class=\"oxy-text-7689-116 oxy-text\">\n<b>ZL101A<\/b> \u2014 the grade behind every case on this page\n<\/div><\/li><li class=\"oxy-container-7689-119 oxy-container\"><div class=\"oxy-text-7689-118 oxy-text\">\n<b>Class 1<\/b> \u2014 dimensional accuracy achieved on all five cases below\n<\/div><\/li><\/ul><\/aside><\/div><\/div><\/section><section class=\"oxy-container-7689-133 oxy-container lyafs-sec\"><div class=\"oxy-container-7689-132 oxy-container lyafs-inner\"><div class=\"oxy-container-7689-127 oxy-container lyafs-head\"><span class=\"oxy-text-7689-125 oxy-text lyafs-rail\">\n01\n<\/span><h2 class=\"oxy-text-7689-126 oxy-text lyafs-h2\">\nWhat low pressure casting is, and when it is the right process\n<\/h2><\/div><p class=\"oxy-text-7689-128 oxy-text lyafs-sub\">\nThe mould sits on top of a sealed furnace. A ceramic riser tube reaches down into the melt, and dry compressed air at a fraction of a bar presses the metal up that tube and into the cavity. Because the metal rises into the mould rather than being poured into it, it fills quietly \u2014 no turbulence, no folded oxide film, no gas dragged in behind the stream.\n<\/p><p class=\"oxy-text-7689-129 oxy-text lyafs-sub\">\nThe second advantage is what happens after the fill. The riser tube stays full of liquid metal and remains the last thing to freeze, so it feeds the casting as it contracts. Solidification runs from the far end of the cavity back towards the gate, which is the direction you want. That is why low pressure parts come out pressure-tight where a gravity pour of the same geometry can leak, and why the process needs almost no feeder metal \u2014 the yield is high and the cut-off is a single stub.\n<\/p><div class=\"oxy-container-7689-131 oxy-container lyafs-note\"><p class=\"oxy-text-7689-130 oxy-text\">\nIf your part is an aluminium housing with an internal cavity that has to hold gas or oil, low pressure is usually the process. If it is a simple structural part with no pressure duty, gravity casting is cheaper. If you need tens of thousands of parts a year, none of the sand processes are the answer \u2014 that is die casting, and we do not run it.\n<\/p><\/div><\/div><\/section><section class=\"oxy-container-7689-194 oxy-container lyafs-sec lyafs-sec--alt\"><div class=\"oxy-container-7689-193 oxy-container lyafs-inner\"><div class=\"oxy-container-7689-136 oxy-container lyafs-head\"><span class=\"oxy-text-7689-134 oxy-text lyafs-rail\">\n02\n<\/span><h2 class=\"oxy-text-7689-135 oxy-text lyafs-h2\">\nLow pressure, gravity or die casting\n<\/h2><\/div><p class=\"oxy-text-7689-137 oxy-text lyafs-p\">\nThree processes, three different answers to the same question: how does the metal get into the cavity, and how does it behave once it is there. The choice is usually decided by whether the part has to be pressure-tight, and by how many you need.\n<\/p><div class=\"oxy-container-7689-192 oxy-container lyafs-table-wrap\"><table class=\"oxy-container-7689-191 oxy-container lyafs-table\"><caption class=\"oxy-text-7689-138 oxy-text\">\nThe three routes put side by side. Low pressure is the one that buys you density without buying a steel die.\n<\/caption><thead class=\"oxy-container-7689-144 oxy-container\"><tr class=\"oxy-container-7689-143 oxy-container\"><th class=\"oxy-text-7689-139 oxy-text\" scope=\"col\">\nProperty\n<\/th><th class=\"oxy-text-7689-140 oxy-text\" scope=\"col\">\nLow pressure\n<\/th><th class=\"oxy-text-7689-141 oxy-text\" scope=\"col\">\nGravity\n<\/th><th class=\"oxy-text-7689-142 oxy-text\" scope=\"col\">\nHigh pressure die\n<\/th><\/tr><\/thead><tbody class=\"oxy-container-7689-190 oxy-container\"><tr class=\"oxy-container-7689-149 oxy-container\"><th class=\"oxy-text-7689-145 oxy-text\" scope=\"row\">\nHow the metal enters\n<\/th><td class=\"oxy-text-7689-146 oxy-text\">\nPressed up a riser tube\n<\/td><td class=\"oxy-text-7689-147 oxy-text\">\nPoured into the sprue\n<\/td><td class=\"oxy-text-7689-148 oxy-text\">\nInjected at speed\n<\/td><\/tr><tr class=\"oxy-container-7689-154 oxy-container\"><th class=\"oxy-text-7689-150 oxy-text\" scope=\"row\">\nFilling behaviour\n<\/th><td class=\"oxy-text-7689-151 oxy-text lyafs-yes\">\nSlow and laminar\n<\/td><td class=\"oxy-text-7689-152 oxy-text\">\nGravity, some turbulence\n<\/td><td class=\"oxy-text-7689-153 oxy-text\">\nFast and turbulent\n<\/td><\/tr><tr class=\"oxy-container-7689-159 oxy-container\"><th class=\"oxy-text-7689-155 oxy-text\" scope=\"row\">\nPressure-tightness\n<\/th><td class=\"oxy-text-7689-156 oxy-text lyafs-yes\">\nBest of the three\n<\/td><td class=\"oxy-text-7689-157 oxy-text\">\nModerate\n<\/td><td class=\"oxy-text-7689-158 oxy-text\">\nGood, but gas porosity risk\n<\/td><\/tr><tr class=\"oxy-container-7689-164 oxy-container\"><th class=\"oxy-text-7689-160 oxy-text\" scope=\"row\">\nRendement de coul\u00e9e\n<\/th><td class=\"oxy-text-7689-161 oxy-text lyafs-yes\">\nHigh \u2014 one riser stub\n<\/td><td class=\"oxy-text-7689-162 oxy-text\">\nLower, heavier feeders\n<\/td><td class=\"oxy-text-7689-163 oxy-text\">\nHigh\n<\/td><\/tr><tr class=\"oxy-container-7689-169 oxy-container\"><th class=\"oxy-text-7689-165 oxy-text\" scope=\"row\">\nOutillage\n<\/th><td class=\"oxy-text-7689-166 oxy-text lyafs-yes\">\nPrinted sand mould, no pattern\n<\/td><td class=\"oxy-text-7689-167 oxy-text lyafs-yes\">\nPrinted sand mould, no pattern\n<\/td><td class=\"oxy-text-7689-168 oxy-text\">\nHardened steel die\n<\/td><\/tr><tr class=\"oxy-container-7689-174 oxy-container\"><th class=\"oxy-text-7689-170 oxy-text\" scope=\"row\">\nEconomic at\n<\/th><td class=\"oxy-text-7689-171 oxy-text\">\n1 part upwards\n<\/td><td class=\"oxy-text-7689-172 oxy-text\">\n1 part upwards\n<\/td><td class=\"oxy-text-7689-173 oxy-text\">\nTens of thousands a year\n<\/td><\/tr><tr class=\"oxy-container-7689-179 oxy-container\"><th class=\"oxy-text-7689-175 oxy-text\" scope=\"row\">\n\u00c9paisseur de la paroi\n<\/th><td class=\"oxy-text-7689-176 oxy-text\">\nThin to medium\n<\/td><td class=\"oxy-text-7689-177 oxy-text\">\nMedium\n<\/td><td class=\"oxy-text-7689-178 oxy-text\">\nThin\n<\/td><\/tr><tr class=\"oxy-container-7689-184 oxy-container\"><th class=\"oxy-text-7689-180 oxy-text\" scope=\"row\">\nCycle time\n<\/th><td class=\"oxy-text-7689-181 oxy-text\">\nSlower\n<\/td><td class=\"oxy-text-7689-182 oxy-text\">\nSlow\n<\/td><td class=\"oxy-text-7689-183 oxy-text lyafs-yes\">\nFastest\n<\/td><\/tr><tr class=\"oxy-container-7689-189 oxy-container\"><th class=\"oxy-text-7689-185 oxy-text\" scope=\"row\">\nTypical parts\n<\/th><td class=\"oxy-text-7689-186 oxy-text\">\nSwitchgear and GIS housings, motor housings, wheels\n<\/td><td class=\"oxy-text-7689-187 oxy-text\">\nBrackets, covers, simple structural parts\n<\/td><td class=\"oxy-text-7689-188 oxy-text\">\nSmall precise components at volume\n<\/td><\/tr><\/tbody><\/table><\/div><\/div><\/section><section class=\"oxy-container-7689-238 oxy-container lyafs-sec\" id=\"cases\"><div class=\"oxy-container-7689-237 oxy-container lyafs-inner\"><div class=\"oxy-container-7689-197 oxy-container lyafs-head\"><span class=\"oxy-text-7689-195 oxy-text lyafs-rail\">\n03\n<\/span><h2 class=\"oxy-text-7689-196 oxy-text lyafs-h2\">\nFive low pressure cases, documented\n<\/h2><\/div><p class=\"oxy-text-7689-198 oxy-text lyafs-p\">\nEvery part below is aluminium ZL101A, cast low pressure into a printed sand mould, in small batch, and delivered in 20 days from the drawing. All five reached Class\u00a01 dimensional accuracy and were delivered fully machined. They come from high-voltage switchgear and gas-insulated switchgear duty, where a housing that leaks is not an option.\n<\/p><div class=\"oxy-container-7689-233 oxy-container lyafs-table-wrap\"><table class=\"oxy-container-7689-232 oxy-container lyafs-table\"><caption class=\"oxy-text-7689-199 oxy-text\">\nDocumented low pressure work. Printed sand mould, ZL101A, low pressure casting, 20-day small-batch delivery.\n<\/caption><thead class=\"oxy-container-7689-205 oxy-container\"><tr class=\"oxy-container-7689-204 oxy-container\"><th class=\"oxy-text-7689-200 oxy-text\" scope=\"col\">\nPart\n<\/th><th class=\"oxy-text-7689-201 oxy-text\" scope=\"col\">\nSize\n<\/th><th class=\"oxy-text-7689-202 oxy-text\" scope=\"col\">\nDimensional result\n<\/th><th class=\"oxy-text-7689-203 oxy-text\" scope=\"col\">\nDelivered\n<\/th><\/tr><\/thead><tbody class=\"oxy-container-7689-231 oxy-container\"><tr class=\"oxy-container-7689-210 oxy-container\"><th class=\"oxy-text-7689-206 oxy-text\" scope=\"row\">\nContact base\n<\/th><td class=\"oxy-text-7689-207 oxy-text\">\n400 \u00d7 85 mm\n<\/td><td class=\"oxy-text-7689-208 oxy-text\">\nClass 1\n<\/td><td class=\"oxy-text-7689-209 oxy-text\">\nFully machined\n<\/td><\/tr><tr class=\"oxy-container-7689-215 oxy-container\"><th class=\"oxy-text-7689-211 oxy-text\" scope=\"row\">\nCylinder\n<\/th><td class=\"oxy-text-7689-212 oxy-text\">\n500 \u00d7 80 mm\n<\/td><td class=\"oxy-text-7689-213 oxy-text\">\nClass 1\n<\/td><td class=\"oxy-text-7689-214 oxy-text\">\nFully machined\n<\/td><\/tr><tr class=\"oxy-container-7689-220 oxy-container\"><th class=\"oxy-text-7689-216 oxy-text\" scope=\"row\">\nCorona shield\n<\/th><td class=\"oxy-text-7689-217 oxy-text\">\n650 \u00d7 150 mm\n<\/td><td class=\"oxy-text-7689-218 oxy-text\">\nClass 1\n<\/td><td class=\"oxy-text-7689-219 oxy-text\">\nFully machined\n<\/td><\/tr><tr class=\"oxy-container-7689-225 oxy-container\"><th class=\"oxy-text-7689-221 oxy-text\" scope=\"row\">\nConductor\n<\/th><td class=\"oxy-text-7689-222 oxy-text lyafs-yes\">\n2,250 \u00d7 420 mm\n<\/td><td class=\"oxy-text-7689-223 oxy-text\">\nClass 1\n<\/td><td class=\"oxy-text-7689-224 oxy-text\">\nFully machined\n<\/td><\/tr><tr class=\"oxy-container-7689-230 oxy-container\"><th class=\"oxy-text-7689-226 oxy-text\" scope=\"row\">\nVessel\n<\/th><td class=\"oxy-text-7689-227 oxy-text\">\n800 \u00d7 600 mm\n<\/td><td class=\"oxy-text-7689-228 oxy-text\">\nClass 1\n<\/td><td class=\"oxy-text-7689-229 oxy-text\">\nFully machined\n<\/td><\/tr><\/tbody><\/table><\/div><p class=\"oxy-text-7689-234 oxy-text lyafs-p\">\nThe conductor is the one worth looking at twice. At 2,250\u00a0mm it is longer than most low pressure machines are usually asked to feed, and it was made without a die \u2014 the mould was printed, poured and finished inside the same 20 days as the rest of the batch.\n<\/p><img class=\"oxy-image-7689-235 oxy-image lyafs-wide\" src=\"https:\/\/www.lyafs.com\/wp-content\/uploads\/2026\/10\/lp-gis-conductor.jpg\" alt=\"GIS conductor castings after low pressure casting\" loading=\"lazy\" decoding=\"async\"><p class=\"oxy-text-7689-236 oxy-text lyafs-p\">\nThe same line runs gas-insulated switchgear enclosures for ultra-high voltage transmission. Those are the parts that made the process worth building around: internal geometry that has to be gas-tight, wall sections that vary across the part, and quantities that never justify a steel die.\n<\/p><\/div><\/section><section class=\"oxy-container-7689-261 oxy-container lyafs-sec lyafs-sec--alt\"><div class=\"oxy-container-7689-260 oxy-container lyafs-inner\"><div class=\"oxy-container-7689-241 oxy-container lyafs-head\"><span class=\"oxy-text-7689-239 oxy-text lyafs-rail\">\n04\n<\/span><h2 class=\"oxy-text-7689-240 oxy-text lyafs-h2\">\nThe cycle, step by step\n<\/h2><\/div><p class=\"oxy-text-7689-242 oxy-text lyafs-p\">\nFour things happen in order, and the whole point of the process is in the second and third of them.\n<\/p><ul class=\"oxy-container-7689-259 oxy-container lyafs-rail-steps\"><li class=\"oxy-container-7689-246 oxy-container\"><span class=\"oxy-text-7689-243 oxy-text lyafs-rail-num\">\n01\n<\/span><h3 class=\"oxy-text-7689-244 oxy-text lyafs-h3\">\nSeal and connect\n<\/h3><p class=\"oxy-text-7689-245 oxy-text lyafs-p\">\nThe printed sand mould is clamped onto the furnace and a ceramic riser tube is brought up into the melt. The furnace is sealed, because the next step depends on the only opening being the tube.\n<\/p><\/li><li class=\"oxy-container-7689-250 oxy-container\"><span class=\"oxy-text-7689-247 oxy-text lyafs-rail-num\">\n02\n<\/span><h3 class=\"oxy-text-7689-248 oxy-text lyafs-h3\">\nPressurise and fill\n<\/h3><p class=\"oxy-text-7689-249 oxy-text lyafs-p\">\nDry compressed air at a fraction of a bar pushes metal up the tube and into the cavity. The pressure is held low and the fill rate is controlled, so the metal rises as a quiet front rather than a jet.\n<\/p><\/li><li class=\"oxy-container-7689-254 oxy-container\"><span class=\"oxy-text-7689-251 oxy-text lyafs-rail-num\">\n03\n<\/span><h3 class=\"oxy-text-7689-252 oxy-text lyafs-h3\">\nHold while it freezes\n<\/h3><p class=\"oxy-text-7689-253 oxy-text lyafs-p\">\nPressure is maintained after the cavity is full. The riser is still liquid metal under pressure, so it feeds the shrinkage as the casting solidifies from the far end back towards the gate.\n<\/p><\/li><li class=\"oxy-container-7689-258 oxy-container\"><span class=\"oxy-text-7689-255 oxy-text lyafs-rail-num\">\n04\n<\/span><h3 class=\"oxy-text-7689-256 oxy-text lyafs-h3\">\nRelease and finish\n<\/h3><p class=\"oxy-text-7689-257 oxy-text lyafs-p\">\nPressure is vented, the mould comes off, and the metal left in the tube is recycled. What is left on the casting is a single stub to cut, then machining and inspection.\n<\/p><\/li><\/ul><\/div><\/section><section class=\"oxy-container-7689-279 oxy-container lyafs-sec\"><div class=\"oxy-container-7689-278 oxy-container lyafs-inner\"><div class=\"oxy-container-7689-264 oxy-container lyafs-head\"><span class=\"oxy-text-7689-262 oxy-text lyafs-rail\">\n05\n<\/span><h2 class=\"oxy-text-7689-263 oxy-text lyafs-h2\">\nWhy the mould is printed\n<\/h2><\/div><p class=\"oxy-text-7689-265 oxy-text lyafs-p\">\nConventional low pressure casting runs into a metal die, which is why it is normally a volume process. We run it into a printed sand mould instead. The mould is printed from your CAD file in a few days, so there is no die to cut, no pattern to store, and no minimum quantity \u2014 the process that used to need a die is now available at one part.\n<\/p><ul class=\"oxy-container-7689-275 oxy-container lyafs-figs\"><li class=\"oxy-container-7689-268 oxy-container lyafs-fig\"><img class=\"oxy-image-7689-266 oxy-image\" src=\"https:\/\/www.lyafs.com\/wp-content\/uploads\/2026\/10\/lp-mould-motor.jpg\" alt=\"3D printed sand mould for a motor end housing\" loading=\"lazy\" decoding=\"async\"><figcaption class=\"oxy-text-7689-267 oxy-text\">\nMould for a motor end housing<span>Printed from CAD, cores included<\/span>\n<\/figcaption><\/li><li class=\"oxy-container-7689-271 oxy-container lyafs-fig\"><img class=\"oxy-image-7689-269 oxy-image\" src=\"https:\/\/www.lyafs.com\/wp-content\/uploads\/2026\/10\/lp-mould-water.jpg\" alt=\"3D printed sand core assembly for a water-cooled casing\" loading=\"lazy\" decoding=\"async\"><figcaption class=\"oxy-text-7689-270 oxy-text\">\nCore assembly for a water-cooled casing<span>Printed cores, glued as one set<\/span>\n<\/figcaption><\/li><li class=\"oxy-container-7689-274 oxy-container lyafs-fig\"><img class=\"oxy-image-7689-272 oxy-image\" src=\"https:\/\/www.lyafs.com\/wp-content\/uploads\/2026\/10\/lp-mould-head.jpg\" alt=\"3D printed sand mould and cores for a cylinder head\" loading=\"lazy\" decoding=\"async\"><figcaption class=\"oxy-text-7689-273 oxy-text\">\nMould and cores for a cylinder head<span>Internal passages in one setup<\/span>\n<\/figcaption><\/li><\/ul><p class=\"oxy-text-7689-276 oxy-text lyafs-p\">\nThe mould-making cycle runs about 70% shorter than the traditional route, and the printed surface comes out at around Ra\u00a025\u00b5m against Ra\u00a050\u00b5m or worse from a rammed sand mould. Printed moulds are made from silica or ceramic sand with furan resin \u2014 the same chemistry a conventional no-bake line runs, so the mould behaves the way a foundry expects.\n<\/p><p class=\"oxy-text-7689-277 oxy-text lyafs-p\">\nThe moulds come off our own machines: the <a href=\"\/fr\/3d-printers\/sand-3d-printers\/3dptek-j1800\/\">3DPTEK-J1800<\/a> for moulds and cores up to about a metre, the <a href=\"\/fr\/3d-printers\/sand-3d-printers\/3dptek-j4000\/\">3DPTEK-J4000<\/a> for the large work. <a href=\"\/fr\/3d-printers\/sand-3d-printers\/\">See the full sand printer range.<\/a>\n<\/p><\/div><\/section><section class=\"oxy-container-7689-304 oxy-container lyafs-sec lyafs-sec--alt\"><div class=\"oxy-container-7689-303 oxy-container lyafs-inner\"><div class=\"oxy-container-7689-282 oxy-container lyafs-head\"><span class=\"oxy-text-7689-280 oxy-text lyafs-rail\">\n06\n<\/span><h2 class=\"oxy-text-7689-281 oxy-text lyafs-h2\">\nWhat decides whether a low pressure casting passes\n<\/h2><\/div><p class=\"oxy-text-7689-283 oxy-text lyafs-p\">\nLow pressure removes some defects by design and introduces a couple of its own. The process either makes a dense part or it makes a part with holes in it, and which one you get comes down to these six.\n<\/p><ol class=\"oxy-container-7689-302 oxy-container lyafs-numlist\"><li class=\"oxy-container-7689-286 oxy-container\"><h3 class=\"oxy-text-7689-284 oxy-text\">\nWet or oily pressurising air\n<\/h3><p class=\"oxy-text-7689-285 oxy-text\">\nThe air that pushes the metal in is in direct contact with the melt surface. Moisture or oil in that air goes straight into the metal as hydrogen, and comes out as porosity in the last section to freeze. Dried, filtered air is not optional.\n<\/p><\/li><li class=\"oxy-container-7689-289 oxy-container\"><h3 class=\"oxy-text-7689-287 oxy-text\">\nFill rate matched to wall thickness\n<\/h3><p class=\"oxy-text-7689-288 oxy-text\">\nToo slow and the metal freezes before the cavity is full \u2014 a misrun or a cold shut. Too fast and it stops being laminar, which is the whole reason for using the process. The pressure ramp is set against the thinnest section, not the average.\n<\/p><\/li><li class=\"oxy-container-7689-292 oxy-container\"><h3 class=\"oxy-text-7689-290 oxy-text\">\nSolidification order\n<\/h3><p class=\"oxy-text-7689-291 oxy-text\">\nThe riser only feeds while it is still liquid. If a heavy section freezes before the gate does, it is isolated and pulls a void regardless of the pressure above it. Section modulus decides the rigging, and the process will not rescue a bad one.\n<\/p><\/li><li class=\"oxy-container-7689-295 oxy-container\"><h3 class=\"oxy-text-7689-293 oxy-text\">\nMould strength and coating\n<\/h3><p class=\"oxy-text-7689-294 oxy-text\">\nThe mould has to hold against the fill and then survive the metal. Printed sand is strong and consistent, but the coating still has to be right or the surface burns on and the casting picks up sand.\n<\/p><\/li><li class=\"oxy-container-7689-298 oxy-container\"><h3 class=\"oxy-text-7689-296 oxy-text\">\nDistortion as it cools\n<\/h3><p class=\"oxy-text-7689-297 oxy-text\">\nA large thin-walled housing comes out of a restrained mould and moves as it cools. The printed mould's collapsibility helps; the rigging still has to let the part contract in the direction it wants to.\n<\/p><\/li><li class=\"oxy-container-7689-301 oxy-container\"><h3 class=\"oxy-text-7689-299 oxy-text\">\nThe riser stub and gate\n<\/h3><p class=\"oxy-text-7689-300 oxy-text\">\nLow pressure leaves one stub to cut rather than a feeder system, which is the advantage \u2014 but the cut has to be clean and below the finished surface, or it becomes a machining operation on a face that was supposed to be as-cast.\n<\/p><\/li><\/ol><\/div><\/section><section class=\"oxy-container-7689-329 oxy-container lyafs-sec\"><div class=\"oxy-container-7689-328 oxy-container lyafs-inner\"><div class=\"oxy-container-7689-307 oxy-container lyafs-head\"><span class=\"oxy-text-7689-305 oxy-text lyafs-rail\">\n07\n<\/span><h2 class=\"oxy-text-7689-306 oxy-text lyafs-h2\">\nLow pressure castings we have poured\n<\/h2><\/div><p class=\"oxy-text-7689-308 oxy-text lyafs-p\">\nSwitchgear housings, motor housings and enclosures \u2014 the family of parts the process exists for. Every one of them was cast into a printed sand mould, so every one of them could be a single part.\n<\/p><ul class=\"oxy-container-7689-327 oxy-container lyafs-figs\"><li class=\"oxy-container-7689-311 oxy-container lyafs-fig\"><img class=\"oxy-image-7689-309 oxy-image\" src=\"https:\/\/www.lyafs.com\/wp-content\/uploads\/2026\/10\/lp-corona-shield.jpg\" alt=\"GIS corona shield castings in aluminium\" loading=\"lazy\" decoding=\"async\"><figcaption class=\"oxy-text-7689-310 oxy-text\">\nCorona shields<span>Aluminium, printed mould<\/span>\n<\/figcaption><\/li><li class=\"oxy-container-7689-314 oxy-container lyafs-fig\"><img class=\"oxy-image-7689-312 oxy-image\" src=\"https:\/\/www.lyafs.com\/wp-content\/uploads\/2026\/10\/lp-gis-enclosure.jpg\" alt=\"Ultra-high voltage GIS enclosure casting\" loading=\"lazy\" decoding=\"async\"><figcaption class=\"oxy-text-7689-313 oxy-text\">\nUltra-high voltage GIS enclosure<span>Gas-tight, low pressure<\/span>\n<\/figcaption><\/li><li class=\"oxy-container-7689-317 oxy-container lyafs-fig\"><img class=\"oxy-image-7689-315 oxy-image\" src=\"https:\/\/www.lyafs.com\/wp-content\/uploads\/2026\/10\/lp-gis-batch.jpg\" alt=\"Batch production of GIS enclosures in the foundry\" loading=\"lazy\" decoding=\"async\"><figcaption class=\"oxy-text-7689-316 oxy-text\">\nGIS enclosure batch<span>Production, not prototype<\/span>\n<\/figcaption><\/li><li class=\"oxy-container-7689-320 oxy-container lyafs-fig\"><img class=\"oxy-image-7689-318 oxy-image\" src=\"https:\/\/www.lyafs.com\/wp-content\/uploads\/2026\/10\/lp-motor-zl101a.jpg\" alt=\"Machined motor housing cast in ZL101A aluminium\" loading=\"lazy\" decoding=\"async\"><figcaption class=\"oxy-text-7689-319 oxy-text\">\nMotor housing in ZL101A<span>Machined after casting<\/span>\n<\/figcaption><\/li><li class=\"oxy-container-7689-323 oxy-container lyafs-fig\"><img class=\"oxy-image-7689-321 oxy-image\" src=\"https:\/\/www.lyafs.com\/wp-content\/uploads\/2026\/10\/lp-ev-housing.jpg\" alt=\"EV motor housing cast in aluminium\" loading=\"lazy\" decoding=\"async\"><figcaption class=\"oxy-text-7689-322 oxy-text\">\nEV motor housing<span>Aluminium, thin-walled<\/span>\n<\/figcaption><\/li><li class=\"oxy-container-7689-326 oxy-container lyafs-fig\"><img class=\"oxy-image-7689-324 oxy-image\" src=\"https:\/\/www.lyafs.com\/wp-content\/uploads\/2026\/10\/lp-gis-housings.jpg\" alt=\"High voltage switchgear housings cast in aluminium\" loading=\"lazy\" decoding=\"async\"><figcaption class=\"oxy-text-7689-325 oxy-text\">\nSwitchgear housings<span>Batch, machined all over<\/span>\n<\/figcaption><\/li><\/ul><\/div><\/section><section class=\"oxy-container-7689-354 oxy-container lyafs-sec lyafs-sec--alt\"><div class=\"oxy-container-7689-353 oxy-container lyafs-inner\"><div class=\"oxy-container-7689-332 oxy-container lyafs-head\"><span class=\"oxy-text-7689-330 oxy-text lyafs-rail\">\n08\n<\/span><h2 class=\"oxy-text-7689-331 oxy-text lyafs-h2\">\nWhere low pressure pays off\n<\/h2><\/div><p class=\"oxy-text-7689-333 oxy-text lyafs-p\">\nThe process wins wherever a part has to be dense and the quantity does not justify a steel die. In practice that is these:\n<\/p><ul class=\"oxy-container-7689-352 oxy-container lyafs-grid lyafs-grid--3\"><li class=\"oxy-container-7689-336 oxy-container lyafs-card\"><h3 class=\"oxy-text-7689-334 oxy-text lyafs-h3\">\nGas-insulated switchgear enclosures\n<\/h3><p class=\"oxy-text-7689-335 oxy-text lyafs-p\">\nThe application this line was built around. Internal geometry that must hold insulating gas, wall sections that vary across the part, and volumes that never reach die-casting numbers.\n<\/p><\/li><li class=\"oxy-container-7689-339 oxy-container lyafs-card\"><h3 class=\"oxy-text-7689-337 oxy-text lyafs-h3\">\nSwitchgear and control housings\n<\/h3><p class=\"oxy-text-7689-338 oxy-text lyafs-p\">\nContact bases, cylinders, shielding and covers. Pressure-tight, fully machined, and often delivered as a small batch of several different parts together.\n<\/p><\/li><li class=\"oxy-container-7689-342 oxy-container lyafs-card\"><h3 class=\"oxy-text-7689-340 oxy-text lyafs-h3\">\nMotor and generator housings\n<\/h3><p class=\"oxy-text-7689-341 oxy-text lyafs-p\">\nWater-cooled jackets and motor end housings, in ZL101A and similar alloys. Thin walls with a cooling passage inside are exactly what the process feeds well.\n<\/p><\/li><li class=\"oxy-container-7689-345 oxy-container lyafs-card\"><h3 class=\"oxy-text-7689-343 oxy-text lyafs-h3\">\nEV and commercial vehicle parts\n<\/h3><p class=\"oxy-text-7689-344 oxy-text lyafs-p\">\nWater-cooled shells and housings for electrified drivetrains, where the part is new every model year and no die is worth cutting.\n<\/p><\/li><li class=\"oxy-container-7689-348 oxy-container lyafs-card\"><h3 class=\"oxy-text-7689-346 oxy-text lyafs-h3\">\nPump and valve bodies\n<\/h3><p class=\"oxy-text-7689-347 oxy-text lyafs-p\">\nAluminium bodies with an internal passage that has to be leak-tight. A gravity pour of the same geometry can weep; a low pressure pour usually does not.\n<\/p><\/li><li class=\"oxy-container-7689-351 oxy-container lyafs-card\"><h3 class=\"oxy-text-7689-349 oxy-text lyafs-h3\">\nImpellers and wheels\n<\/h3><p class=\"oxy-text-7689-350 oxy-text lyafs-p\">\nParts where the vanes have to be sound through the section. The laminar fill and the pressure held during freezing both work in your favour.\n<\/p><\/li><\/ul><\/div><\/section><section class=\"oxy-container-7689-373 oxy-container lyafs-sec\"><div class=\"oxy-container-7689-372 oxy-container lyafs-inner\"><div class=\"oxy-container-7689-357 oxy-container lyafs-head\"><span class=\"oxy-text-7689-355 oxy-text lyafs-rail\">\n09\n<\/span><h2 class=\"oxy-text-7689-356 oxy-text lyafs-h2\">\nWhat we do not do\n<\/h2><\/div><p class=\"oxy-text-7689-358 oxy-text lyafs-p\">\nLow pressure is a specific tool, and it is worth being precise about where it stops.\n<\/p><ul class=\"oxy-container-7689-371 oxy-container lyafs-grid lyafs-grid--2\"><li class=\"oxy-container-7689-361 oxy-container lyafs-card\"><h3 class=\"oxy-text-7689-359 oxy-text lyafs-h3\">\nWe do not high pressure die cast\n<\/h3><p class=\"oxy-text-7689-360 oxy-text lyafs-p\">\nHigh pressure die casting is the right answer above roughly 10,000 parts a year and it needs a hardened steel die. We do not run it. If that is your volume, a die caster will beat us on piece price and we will say so.\n<\/p><\/li><li class=\"oxy-container-7689-364 oxy-container lyafs-card\"><h3 class=\"oxy-text-7689-362 oxy-text lyafs-h3\">\nWe do not run low pressure in steel\n<\/h3><p class=\"oxy-text-7689-363 oxy-text lyafs-p\">\nThis line is an aluminium process. Low pressure steel exists in the industry but it is a different plant, a different refractory set and a different temperature regime, and we do not offer it.\n<\/p><\/li><li class=\"oxy-container-7689-367 oxy-container lyafs-card\"><h3 class=\"oxy-text-7689-365 oxy-text lyafs-h3\">\nWe are not the fastest process\n<\/h3><p class=\"oxy-text-7689-366 oxy-text lyafs-p\">\nThe cycle is slower than gravity die casting and much slower than high pressure die casting, because the metal is deliberately allowed to rise slowly. If cycle time is your binding constraint, this is the wrong process.\n<\/p><\/li><li class=\"oxy-container-7689-370 oxy-container lyafs-card\"><h3 class=\"oxy-text-7689-368 oxy-text lyafs-h3\">\nWe do not quote a leak-tight part on geometry alone\n<\/h3><p class=\"oxy-text-7689-369 oxy-text lyafs-p\">\nPressure-tightness depends on the rigging and the solidification order, not just the shape. Where a part has a real pressure or gas-retention duty we will confirm the process with a first casting rather than promising a number.\n<\/p><\/li><\/ul><\/div><\/section><section class=\"oxy-container-7689-397 oxy-container lyafs-sec lyafs-sec--alt\"><div class=\"oxy-container-7689-396 oxy-container lyafs-inner\"><div class=\"oxy-container-7689-376 oxy-container lyafs-head\"><span class=\"oxy-text-7689-374 oxy-text lyafs-rail\">\n10\n<\/span><h2 class=\"oxy-text-7689-375 oxy-text lyafs-h2\">\nChoosing the right route for your part\n<\/h2><\/div><p class=\"oxy-text-7689-377 oxy-text lyafs-p\">\nIf low pressure is not the answer, one of these is. Each runs the same printed-mould chain, so switching route does not cost you the lead time you were trying to save.\n<\/p><ul class=\"oxy-container-7689-393 oxy-container lyafs-links\"><li class=\"oxy-container-7689-380 oxy-container\"><a class=\"oxy-text-link-7689-378 oxy-text-link lyafs-route\" href=\"\/fr\/services\/aluminum-casting\/\" target=\"_self\">\nAluminium casting\n<\/a><p class=\"oxy-text-7689-379 oxy-text lyafs-route-desc\">\nThe alloy family behind every part on this page, and the other processes it runs on.\n<\/p><\/li><li class=\"oxy-container-7689-383 oxy-container\"><a class=\"oxy-text-link-7689-381 oxy-text-link lyafs-route\" href=\"\/fr\/services\/precision-casting\/\" target=\"_self\">\nPrecision investment casting\n<\/a><p class=\"oxy-text-7689-382 oxy-text lyafs-route-desc\">\nWhen the geometry is thin-walled and intricate rather than pressure-tight.\n<\/p><\/li><li class=\"oxy-container-7689-386 oxy-container\"><a class=\"oxy-text-link-7689-384 oxy-text-link lyafs-route\" href=\"\/fr\/services\/stainless-steel-casting\/\" target=\"_self\">\nStainless steel casting\n<\/a><p class=\"oxy-text-7689-385 oxy-text lyafs-route-desc\">\nWhen the duty needs corrosion resistance and aluminium will not survive it.\n<\/p><\/li><li class=\"oxy-container-7689-389 oxy-container\"><a class=\"oxy-text-link-7689-387 oxy-text-link lyafs-route\" href=\"\/fr\/services\/sand-mold-sand-core-3d-printing\/\" target=\"_self\">\nSand mould and core printing\n<\/a><p class=\"oxy-text-7689-388 oxy-text lyafs-route-desc\">\nWhen you need the printed mould or core itself as a product, not the casting.\n<\/p><\/li><li class=\"oxy-container-7689-392 oxy-container\"><a class=\"oxy-text-link-7689-390 oxy-text-link lyafs-route\" href=\"\/fr\/resources\/materials-guide\/\" target=\"_self\">\nMaterials guide\n<\/a><p class=\"oxy-text-7689-391 oxy-text lyafs-route-desc\">\nTo check the alloy against the rest of the range.\n<\/p><\/li><li class=\"oxy-container-7689-446 oxy-container\"><a class=\"oxy-text-link-7689-444 oxy-text-link lyafs-route\" href=\"\/fr\/services\/gravity-casting\/\" target=\"_self\">\nGravity casting\n<\/a><p class=\"oxy-text-7689-445 oxy-text lyafs-route-desc\">\nThe sibling process \u2014 simpler parts where pressure-tightness is not the constraint.\n<\/p><\/li><li class=\"oxy-container-7689-449 oxy-container\"><a class=\"oxy-text-link-7689-447 oxy-text-link lyafs-route\" href=\"\/fr\/services\/bronze-casting\/\" target=\"_self\">\nBronze and brass casting\n<\/a><p class=\"oxy-text-7689-448 oxy-text lyafs-route-desc\">\nCopper alloys on the same printed-mould chain, for bearing and marine duty.\n<\/p><\/li><\/ul><div class=\"oxy-container-7689-395 oxy-container lyafs-note\"><p class=\"oxy-text-7689-394 oxy-text\">\nNot sure which one? Send the drawing and the duty, and let our application engineers make the call. We print the mould before you commit to tooling, so the route is tested rather than argued.\n<\/p><\/div><\/div><\/section><section class=\"oxy-container-7689-433 oxy-container lyafs-sec\"><div class=\"oxy-container-7689-432 oxy-container lyafs-inner\"><div class=\"oxy-container-7689-400 oxy-container lyafs-head\"><span class=\"oxy-text-7689-398 oxy-text lyafs-rail\">\n11\n<\/span><h2 class=\"oxy-text-7689-399 oxy-text lyafs-h2\">\nLow pressure casting questions\n<\/h2><\/div><ul class=\"oxy-container-7689-431 oxy-container lyafs-faq\"><li class=\"oxy-container-7689-403 oxy-container lyafs-qa\"><h3 class=\"oxy-text-7689-401 oxy-text\">\nWhat is low pressure casting?\n<\/h3><p class=\"oxy-text-7689-402 oxy-text\">\nA casting process where a sealed furnace is pressurised with dry compressed air and the metal is pushed up a riser tube into a mould held above it. It fills slowly and laminar, and the riser keeps feeding the casting while it freezes.\n<\/p><\/li><li class=\"oxy-container-7689-406 oxy-container lyafs-qa\"><h3 class=\"oxy-text-7689-404 oxy-text\">\nWhy choose low pressure over gravity casting?\n<\/h3><p class=\"oxy-text-7689-405 oxy-text\">\nDensity and yield. The pressurised, laminar fill avoids the turbulence and oxide entrainment a gravity pour can create, and the riser feeds the shrinkage so the part comes out pressure-tight with very little feeder metal to remove.\n<\/p><\/li><li class=\"oxy-container-7689-409 oxy-container lyafs-qa\"><h3 class=\"oxy-text-7689-407 oxy-text\">\nDo you need a die for low pressure casting?\n<\/h3><p class=\"oxy-text-7689-408 oxy-text\">\nConventionally yes, which is why it is usually a volume process. We cast into printed sand moulds instead, so there is no die and no pattern. That is what makes a single switchgear housing an economic order.\n<\/p><\/li><li class=\"oxy-container-7689-412 oxy-container lyafs-qa\"><h3 class=\"oxy-text-7689-410 oxy-text\">\nWhich metals can be low pressure cast?\n<\/h3><p class=\"oxy-text-7689-411 oxy-text\">\nOn our line, aluminium \u2014 ZL101A and similar. Low pressure steel and low pressure copper exist, but they are different plants and we do not offer them. For copper alloys and steel, see the links above.\n<\/p><\/li><li class=\"oxy-container-7689-415 oxy-container lyafs-qa\"><h3 class=\"oxy-text-7689-413 oxy-text\">\nHow large a part can you cast this way?\n<\/h3><p class=\"oxy-text-7689-414 oxy-text\">\nThe largest documented part on this page is a 2,250\u00a0\u00d7\u00a0420\u00a0mm conductor. Largest single aluminium pour is 1\u00a0t. If your part is outside that, send it and we will tell you honestly rather than quoting it.\n<\/p><\/li><li class=\"oxy-container-7689-418 oxy-container lyafs-qa\"><h3 class=\"oxy-text-7689-416 oxy-text\">\nHow long does it take?\n<\/h3><p class=\"oxy-text-7689-417 oxy-text\">\nEvery case documented above was delivered in 20 days as a small batch, from drawing to fully machined part. The mould-making cycle runs about 70% shorter than the traditional route because there is no pattern or die to make first.\n<\/p><\/li><li class=\"oxy-container-7689-421 oxy-container lyafs-qa\"><h3 class=\"oxy-text-7689-419 oxy-text\">\nWill my part be pressure-tight?\n<\/h3><p class=\"oxy-text-7689-420 oxy-text\">\nThat is what the process is for, and it is why the switchgear and GIS work comes here. But pressure-tightness depends on the rigging and the solidification order for your specific geometry, so where a real pressure duty applies we confirm it with a first casting.\n<\/p><\/li><li class=\"oxy-container-7689-424 oxy-container lyafs-qa\"><h3 class=\"oxy-text-7689-422 oxy-text\">\nWhat tolerance and surface do you get?\n<\/h3><p class=\"oxy-text-7689-423 oxy-text\">\nCT8 to CT12 as cast to ISO 8062, with a printed mould surface around Ra\u00a025\u00b5m against Ra\u00a050\u00b5m or worse from a rammed sand mould. Anything tighter is machined, in the same chain, after stress relief.\n<\/p><\/li><li class=\"oxy-container-7689-427 oxy-container lyafs-qa\"><h3 class=\"oxy-text-7689-425 oxy-text\">\nCan you machine and inspect the castings?\n<\/h3><p class=\"oxy-text-7689-426 oxy-text\">\nYes. CNC machining from 3-axis to 5-axis and nine inspection methods in house, including CMM and 3D scanning. Every part documented above was delivered fully machined against the drawing.\n<\/p><\/li><li class=\"oxy-container-7689-430 oxy-container lyafs-qa\"><h3 class=\"oxy-text-7689-428 oxy-text\">\nIs there a minimum order quantity?\n<\/h3><p class=\"oxy-text-7689-429 oxy-text\">\nOne piece. There is no die and no pattern to amortise, so a single part is a legitimate order \u2014 and a batch of several different parts in one delivery is normal.\n<\/p><\/li><\/ul><\/div><\/section><section class=\"oxy-container-7689-443 oxy-container lyafs-sec lyafs-sec--ink\"><div class=\"oxy-container-7689-442 oxy-container lyafs-inner\"><div class=\"oxy-container-7689-436 oxy-container lyafs-head\"><span class=\"oxy-text-7689-434 oxy-text lyafs-rail\">\n12\n<\/span><h2 class=\"oxy-text-7689-435 oxy-text lyafs-h2\">\nSend a drawing and we will say whether low pressure is right\n<\/h2><\/div><p class=\"oxy-text-7689-437 oxy-text lyafs-p\">\nSend the CAD file, the alloy if you have a callout, the pressure or gas-retention duty, and the quantity. Our application engineers will come back with the process, the rigging approach and a price \u2014 and if gravity casting or a die caster is the better answer for your part, that is what we will tell you.\n<\/p><p class=\"oxy-text-7689-438 oxy-text lyafs-p\">\nYour file stays confidential. Nothing is subcontracted: the mould is printed, the metal is poured low pressure, and the casting is finished, machined and inspected in the same chain.\n<\/p><div class=\"oxy-container-7689-441 oxy-container lyafs-cta-row\"><a class=\"oxy-text-link-7689-439 oxy-text-link lyafs-btn\" href=\"\/fr\/get-a-quote\/\" target=\"_self\">\nSend your drawing for a quote\n<\/a><a class=\"oxy-text-link-7689-440 oxy-text-link lyafs-btn lyafs-btn--ghost\" href=\"\/fr\/about-us\/contact\/\" target=\"_self\">\nTalk to an application engineer\n<\/a><\/div><\/div><\/section><\/main>","protected":false},"excerpt":{"rendered":"<p>Low pressure casting service Low pressure casting for pressure-tight aluminium parts, without a die Low pressure casting fills the mould from below, pushing metal up a riser tube with nothing more than dried compressed air. The fill is slow and laminar, the riser keeps feeding as the part freezes, and the result is a dense, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7679,"parent":70,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_oxygen_hide_in_design_set":false,"_oxygen_tags":"","footnotes":""},"class_list":["post-7689","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<title>Low Pressure Casting | Aluminium, No Die, Pressure-Tight - 3DPTEK | AFS<\/title>\n<meta name=\"description\" content=\"Low pressure casting in ZL101A aluminium into 3D printed sand moulds. No die, no pattern. Pressure-tight switchgear and motor housings, 20-day small batches.\" \/>\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.lyafs.com\/fr\/services\/low-pressure-casting\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Low Pressure Casting | Aluminium, No Die, Pressure-Tight - 3DPTEK | AFS\" \/>\n<meta property=\"og:description\" content=\"Low pressure casting in ZL101A aluminium into 3D printed sand moulds. No die, no pattern. 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