Apparatus for carrying out a resin transfer molding (RTM) process and resin transfer molding (RTM) process
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B29C-045/02
B29C-070/48
B29C-045/66
B29C-043/18
B29C-045/14
B29C-051/10
출원번호
US-0806674
(2011-06-28)
등록번호
US-9393743
(2016-07-19)
우선권정보
DE-20 2010 007 931 U (2010-06-29)
국제출원번호
PCT/DE2011/075151
(2011-06-28)
§371/§102 date
20121221
(20121221)
국제공개번호
WO2012/052009
(2012-04-26)
발명자
/ 주소
Kraemer, Dirk
출원인 / 주소
First Composites GmbH
대리인 / 주소
Crowell & Moring LLP
인용정보
피인용 횟수 :
0인용 특허 :
3
초록▼
Apparatus for resin transfer molding (RTM) and an RTM process for producing integral components. The apparatus has a closable mold (W) with a mold cavity (F), and an injection unit (10) coupled to the mold such that a resin is introducible into the mold; the mold has at least one resin outlet (3) co
Apparatus for resin transfer molding (RTM) and an RTM process for producing integral components. The apparatus has a closable mold (W) with a mold cavity (F), and an injection unit (10) coupled to the mold such that a resin is introducible into the mold; the mold has at least one resin outlet (3) connected to the mold cavity through which resin escapes after the mold is filled; a measuring unit situated at or downstream from the outlet detects escaping resin flow is and is coupled to a resin flow closing unit (5) such that the unit closes the outlet when escaping resin is detected. In the process a control system (11) transmits a signal for closing the resin flow closing unit to the closing unit when resin flow is detected such that the resin flow closing unit is closed and the flow of resin escaping the mold is interrupted.
대표청구항▼
1. Apparatus for carrying out a resin transfer molding process for producing an integral component, said apparatus comprising: a closable mold provided with a mold cavity and having at least one resin outlet connected to the mold cavity through which injection resin may escape after the mold has bee
1. Apparatus for carrying out a resin transfer molding process for producing an integral component, said apparatus comprising: a closable mold provided with a mold cavity and having at least one resin outlet connected to the mold cavity through which injection resin may escape after the mold has been filled;an injection unit coupled to the mold for introducing injection resin into the mold;a resin flow closing unit for closing said at least one resin outlet;a measuring unit situated at or downstream from the resin outlet for detecting a flow of escaping resin; andat least one pressure sensor for detecting a pressure which occurs in the mold cavity during the resin transfer molding process;wherein said measuring unit is coupled to the resin flow closing unit in such a way that the resin flow closing unit closes when an escaping resin flow is detected by the measuring unit; andwherein after the resin flow closing unit has been closed in response to a detection of escaping resin flow by the measuring unit, the resin flow closing unit is reopened if the pressure in the mold cavity exceeds a predefined pressure. 2. An apparatus as claimed in claim 1, wherein said at least one pressure sensor is situated in said mold cavity. 3. An apparatus as claimed in claim 1, wherein the mold has a plastic hose or a line which adjoins the resin outlet through which injection resin escaping from the mold flows, and the measuring unit detects the resin flow through the plastic hose or the line. 4. An apparatus as claimed in claim 3, wherein at least a portion of said plastic hose or said line is transparent, and the measuring unit is constructed in the form of an optical sensor or a capacitive sensor for resin flow detection and is situated at a transparent portion of said plastic hose or said line. 5. An apparatus as claimed in claim 1, wherein said resin flow closing unit is a pneumatically controlled check valve for interrupting the resin flow. 6. An apparatus as claimed in claim 1, wherein the mold has a plurality of resin outlets corresponding to the configuration of the integral component to be produced, and a measuring unit for detecting a flow of escaping resin is associated with at least one of said plurality of resin outlets. 7. An apparatus as claimed in claim 6, wherein a respective measuring unit for detecting a flow of escaping resin is associated with each of said plurality of resin outlets. 8. An apparatus as claimed in claim 1, wherein a plurality of pressure sensors are provided for detecting the pressure in the mold cavity. 9. An apparatus as claimed in claim 1, wherein the injection unit comprises a mixing head for mixing the injection resin and a hardener for the injection resin; said mixing head being supplied with the injection resin and the hardener from respective injection resin and hardener storage tanks each connected with the mixing head through a respective motor/pump assembly and a respective feed line; said mixing head further comprising a heating device for heating the injection resin and the hardener, and return lines parallel to the feed lines for returning unmixed injection resin and hardener to their respective storage tanks. 10. A resin transfer molding process for producing integral components using a closable mold provided with a mold cavity and having at least one resin outlet connected to the mold cavity through which a flow of injection resin may escape after the mold has been filled, and an injection unit which can be coupled to the mold for introducing an injection resin into the mold; said at least one resin outlet being closable by a resin flow closing unit; wherein a measuring unit which detects the escaping flow of injection resin is situated at or downstream from the resin outlet and is coupled to the resin flow closing unit, and a signal for closing the resin flow closing unit is transmitted to the resin flow closing unit via a control system when an escaping resin flow is detected by the measuring unit, and the resin flow closing unit is closed and the resin flow escaping from the mold is interrupted, andwherein a pressure occurring in the mold cavity during the resin transfer molding process is detected by at least one pressure sensor, and after the resin flow closing unit has been closed in response to the signal from the measuring unit, the resin flow closing unit is reopened if a pressure exceeding a predefined pressure is detected in the mold cavity. 11. A process as claimed in claim 10, wherein when a pressure exceeding a predefined pressure is detected in the mold cavity and the resin flow closing unit is reopened, the measuring unit for detecting the resin flow is deactivated, andafter the pressure drops below said predefined pressure, the resin flow closing unit once again closes. 12. A process as claimed in claim 10, wherein: the injection unit comprises a mixing head for mixing conveyed volumes of the injection resin and of a hardener for the injection resin; andthe conveyed volume of the injection resin and of the hardener is reduced when the predefined pressure in the mold cavity is exceeded. 13. A process as claimed in claim 11, wherein in a manual/automatic mode, the first closing of the resin flow closing unit is triggered as a result of a sensor of the measuring unit detecting injection resin escaping through the at least one resin outlet; and at the start of a flushing operation in the further injection process, the opening and closing process of the resin flow closing unit is detected and stored by the control system as a chronological sequence of the on/off state of all connected resin flow closing units until the end of the injection process, and the control system emits auditory and/or visual warnings if pressure parameters above the predefined pressure are detected; orin a partially dynamic process, the routine which is detected and recorded in a manual process is carried out as a temporally detected process of the opening and closing of the pneumatically controlled check valves in the form of the resin flow closing unit; orin an automatic mode the routine of the partially dynamic process is available as a file, and is read by software upon start-up of the automatic mode, and is started and executed at an appropriate time in the injection process. 14. A process as claimed in claim 13, wherein said process is carried out in the automatic mode while also taking into account the detected pressure in the mold cavity as introduction of injection resin into the mold cavity proceeds over time, and the control system opens the resin flow closing unit when the detected pressure exceeds the predetermined pressure until the detected pressure drops below said predetermined pressure.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (3)
Graff John (West Suffield CT), Apparatus for resin transfer molding.
Swenor Richard D. (Enfield CT) Hryniewicz Peter (Suffield CT) Allen Thomas W. (Blandford MA) Carmody Leo E. (Southwick MA), Automated apparatus and method for resin transfer molding.
Seal Ellis C. (Bay St. Louis MS) Ferrell Michael G. (New Orleans LA) Bodepudi Venu P. (New Orleans LA) Biggs ; Jr. Robert W. (Slidell LA), Method for forming composite structures.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.