# US 2014/0151917 A1 · Method and device for producing of a form part > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0151917 A1 - Document ID: US20140151917A1 - Status: Published application - Kind: A1 - Application number: 14/091,926 - Filed: 2013-11-27 - Published: 2014-06-05 - Earliest claimed: 2012-12-04 - Assignees: Hennecke GmbH - Applicants: Hennecke GmbH - Inventors: Juergen WIRTH; Jens GEUER; Michael SCHAMBERG - Web page: https://patentgrep.com/patent/US20140151917A1 ## CPC - B29C 67/246: {Moulding high reactive monomers or prepolymers, e.g. by reaction injection moulding [RIM], liquid injection moulding [LIM] (casting monomers B29C39/006, mixing construction B29B7/74)} - B29C 45/0005: {using fibre reinforcements} - B29C 45/37: Mould cavity walls {, i.e. the inner surface forming the mould cavity, e.g. linings} - B29C 45/7653: {mould clamping forces} - B29C 70/46: using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs - 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) ## Abstract The invention relates to a method for producing of a form part, especially of a plane thin-walled fiber composite part, in a mould (1), comprising the steps: a) Providing of the mould (1), wherein the mould (1) comprises a cavity (2) with a nominal form volume (V) for inserting of a reactive mixture, wherein the cavity (2) is delimited by at least one cavity wall section (3) which is elastically deformable during the inserting of the reactive mixture and wherein the modulus of compressibility (K) of the cavity (2) is between 2,000 bar and 10,000 bar; b) Inserting of the reactive mixture into the cavity (2), wherein the reactive mixture is inserted with such a pressure into the cavity (2) so that the cavity volume is increased during the insertion of the reactive mixture due to elastic deformation of the at least one cavity wall section (3) above the nominal form volume (V); c) Letting solidify of the reactive mixture in the cavity (2); d) Demoulding of the finished form part from the mould (1). Furthermore, the invention relates to a device for the execution of the method. ## Claims ### Claim 1 Method for producing of a form part, especially of a plane thin-walled fiber composite part, in a mould, comprising the steps: a) Providing of the mould, wherein the mould comprises a cavity with a nominal form volume for inserting of a reactive mixture, wherein the cavity is delimited by at least one cavity wall section which is elastically deformable during the inserting of the reactive mixture and wherein the modulus of compressibility of the cavity is between 2,000 bar and 10,000 bar; b) Inserting of the reactive mixture into the cavity, wherein the reactive mixture is inserted with such a pressure into the cavity so that the cavity volume is increased during the insertion of the reactive mixture due to elastic deformation of the at least one cavity wall section above the nominal form volume; c) Letting solidify of the reactive mixture in the cavity; d) Demoulding of the finished form part from the mould. ### Claim 2 (depends on 1) Method according to claim 1, wherein prior the insertion of the reactive mixture into the cavity according to step b) fiber material is introduced, especially inlayed, into the cavity. ### Claim 3 (depends on 1) Method according to claim 1, wherein the reactive mixture is inserted during step b) in such a way that the inner mould pressure lays between 10 bar and 100 bar. ### Claim 4 (depends on 1) Method according to claim 1, wherein after the processing of step b) and prior the processing of step d) an outer pressure, especially a pneumatic or hydraulic pressure, is applied onto the at least one cavity wall section, so that the at least one cavity wall section is deformed and the volume of the cavity is reduced. ### Claim 5 (depends on 4) Method according to claim 4, wherein the outer pressure which is applied onto the at least one cavity wall section is controlled or feed-back controlled in such a manner that the pressure in the reactive mixture in the cavity, which is not yet solidified, is kept on a predetermined level, especially on a constant value. ### Claim 6 (depends on 4) Method according to claim 4, wherein the outer pressure which is applied onto the at least one cavity wall section is increased during the solidification of the reactive mixture. ### Claim 7 (depends on 4) Method according to claim 4, wherein the outer pressure which is applied onto the at least one cavity wall section is decreased during the solidification of the reactive mixture. ### Claim 8 (depends on 4) Method according to claim 4, wherein the outer pressure which is applied onto the at least one cavity wall section is controlled or feed-back controlled in such a manner that the pressure in the reactive mixture in the cavity, which is not yet solidified, decreases from a pressure level immediately after the insertion of the reactive mixture according to step b) of at least 50 bar during letting solidify the reactive mixture according to step c). ### Claim 9 (depends on 4) Method according to claim 4, wherein the outer pressure which is applied onto the at least one cavity wall section is controlled or feed-back controlled in such a manner that the deformation of the at least one cavity wall section becomes zero till the end of letting solidify the reactive mixture according to step c). ### Claim 10 (depends on 1) Device comprising a mould with a cavity with a nominal form volume for execution of the method according to claim 1, wherein the cavity comprises at least one cavity wall section which delimits the cavity and which is designed in such a way that it deforms elastically during the insertion of the reactive mixture, wherein the modulus of compressibility of the cavity is between 2,000 bar and 10,000 bar. ### Claim 11 (depends on 10) Device according to claim 10, wherein the at least one elastically deformable cavity wall section is connected with means by which an external pressure can be applied onto the cavity section.