# US 2014/0150262 A1 · Method for manufacturing a turbine-engine fan casing having an acoustic coating > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0150262 A1 - Document ID: US20140150262A1 - Status: Published application - Kind: A1 - Application number: 14/232,514 - Filed: 2012-07-09 - Published: 2014-06-05 - Earliest claimed: 2011-07-13 - Assignees: Snecma - Inventors: Benedicte Marie Le Borgne; Erwan Camus; Julien Schneider - Web page: https://patentgrep.com/patent/US20140150262A1 ## CPC - F01D 25/24: Casings (modified for heating or cooling F01D25/14); Casing parts, e.g. diaphragms, casing fastenings (casings for rotary machines or engines in general F16M {; special arrangements in stators dealing with breaking-off of part of rotor F01D21/045}) - B29C 70/088: {and with one or more layers of non-plastics material or non-specified material, e.g. supports} - B29C 70/48: and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM] {, e.g. by vacuum} - B29C 70/86: Incorporated in coherent impregnated reinforcing layers, {e.g. by winding} - F01D 11/122: {with erodable or abradable material (blades having cutting or grinding tips F01D5/20)} - F02C 7/045: having provisions for noise suppression - B29B 11/16: comprising fillers or reinforcement {(non-woven fabrics per se D04H1/00, D04H3/00)} - B29C 70/462: {Moulding structures having an axis of symmetry or at least one channel, e.g. tubular structures, frames} - F05D 2260/96: Preventing, counteracting or reducing vibration or noise - F05D 2300/44: Resins - F05D 2300/603: Composites; e.g. fibre-reinforced - F05D 2300/614: Fibres or filaments - F05D 2300/701: Heat treatment - F05D 2300/702: Reinforcement - Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft - Y10T 29/49327: Axial blower or fan - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A method for manufacturing a turbine engine fan casing includes placing a fiber structure constituting the fiber reinforcement of a composite material inside skin of an acoustic coating on a tooling element, and then shaping the fiber preform constituting the fiber reinforcement of an abradable casing on the tooling element with cellular structures of acoustic coating and abradable coating cartridges, if any, being interposed. Both the fiber preform of the casing as impregnated by a precursor resin for the matrix of the composite material of the casing, and also the fiber structure of the inside skin of the acoustic coating as impregnated with a precursor resin for the matrix of the composite material of the inside skin are subjected to resin polymerizing heat treatment, and the inside skin of the acoustic coating is multiply perforated so an assembly is obtained that comprises the casing with an incorporated acoustic coating. ## Claims ### Claim 1 A method for manufacturing a turbine engine fan casing having an abradable coating on its inside face extending over a fraction of its axial dimension at a distance from upstream and downstream ends of the casing, and an acoustic coating arranged downstream and/or upstream of the abradable coating, the inside surfaces of the abradable coating and of the acoustic coating defining at least a portion of the wall of an air inlet passage, the casing being made of composite material comprising fiber reinforcement densified by a resin precursor matrix, the method comprising: using a tooling element having a profile corresponding to the profile of the air inlet passage; depositing a fiber structure that is to constitute fiber reinforcement of a composite material inside skin of the acoustic coating on the tooling element at a location corresponding to the location of the acoustic coating; placing cellular structures of the acoustic coating in the form of sectors over said fiber structure; shaping a fiber preform that is to constitute the fiber reinforcement of the casing on the tooling element with cellular structures of the acoustic coating being interposed between them; subjecting both the fiber preform of the casing as held in its shape and impregnated with a precursor resin for the matrix of the composite material of the casing and also the fiber structure of the inside skin of the acoustic coating as impregnated with a precursor resin for the matrix of the composite material of said inside skin to common resin polymerizing heat treatment; and multiply perforating the inside skin of the acoustic coating after the precursor resin for the matrix of the composite material of said inside skin has polymerized; whereby an assembly is obtained that comprises the casing assembled together with an incorporated acoustic coating comprising said cellular structures and said multiply perforated inside skin. ### Claim 2 (depends on 1) The method according to claim 1, wherein the fiber preform that is to constitute the fiber reinforcement of the casing is shaped on the tooling element with elements constituting abradable coating cartridges being interposed, such that after polymerization an assembly is obtained comprising the casing with the abradable coating cartridges and the acoustic coating incorporated therein. ### Claim 3 (depends on 1) The method according to claim 1, wherein a layer of adhesive is interposed between firstly the fiber preform of the casing and secondly the cellular structures of the acoustic coating and also the abradable coating cartridges, if any. ### Claim 4 (depends on 1) The method according to claim 1, wherein an electrical isolation fiber layer is interposed between firstly the fiber preform of the casing and secondly the cellular structures of the acoustic coating and also the abradable coating cartridges, if any. ### Claim 5 (depends on 1) The method according to claim 1, wherein an adhesive coating is interposed between the fiber structure that is to constitute the fiber reinforcement of the inside skin of the acoustic coating and the cellular structures of the acoustic coating. ### Claim 6 (depends on 1) The method according to claim 1, wherein the fiber preform forming the fiber reinforcement of the casing and the fiber structure forming the fiber reinforcement of the inside skin of the acoustic coating are both formed of fiber textures that are preimpregnated with resin. ### Claim 7 (depends on 1) The method according to claim 1, wherein the fiber preform that is to form the fiber reinforcement of the casing is impregnated with resin after the fiber preform has been shaped. ### Claim 8 (depends on 1) The method according to claim 1, wherein the fiber preform that is to form the fiber reinforcement of the casing and the fiber structure that is to form the fiber reinforcement of the inside skin of the acoustic coating are both impregnated with resin after the fiber preform has been shaped.