EP3917744A1 - Casting method and casting device for an underwater antenna - Google Patents
Casting method and casting device for an underwater antennaInfo
- Publication number
- EP3917744A1 EP3917744A1 EP20701455.6A EP20701455A EP3917744A1 EP 3917744 A1 EP3917744 A1 EP 3917744A1 EP 20701455 A EP20701455 A EP 20701455A EP 3917744 A1 EP3917744 A1 EP 3917744A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- component
- casting
- casting material
- mold
- hollow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- 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
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C39/10—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/12—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- 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
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C39/021—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles by casting in several steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- 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
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/24—Feeding the material into the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- 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
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/26—Moulds or cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/70—Completely encapsulating inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/005—Moulds or cores; Details thereof or accessories therefor characterised by the location of the parting line of the mould parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3456—Antennas, e.g. radomes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/521—Constructional features
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/004—Mounting transducers, e.g. provided with mechanical moving or orienting device
- G10K11/006—Transducer mounting in underwater equipment, e.g. sonobuoys
- G10K11/008—Arrays of transducers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/04—Adaptation for subterranean or subaqueous use
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/34—Adaptation for use in or on ships, submarines, buoys or torpedoes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/44—Special adaptations for subaqueous use, e.g. for hydrophone
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
Definitions
- the invention relates to a method for casting around a component of an underwater antenna using a casting device and a casting device which is designed to carry out this method.
- an underwater antenna such as hydrophones or electronic arrangements or electrical cables
- hydrophones or electronic arrangements or electrical cables must be protected against mechanical damage and chemical influences, even if the underwater antenna comes into contact with the surrounding water. It is therefore desirable to cast such a component.
- this encapsulation should be acoustically permeable and electrically insulating. It must not cause any acoustic interference in the underwater antenna and should therefore have a desired shape and / or thickness without an irregularity.
- the object of the invention is to provide a casting process and a casting device for casting a component of an underwater antenna, which require less effort than known casting processes and devices.
- the encapsulation device according to the invention comprises
- the mold provides a hollow shape.
- the method according to the solution comprises the following steps: - The component is brought into a predetermined holding position relative to the hollow shape and is held in a floating position by the holding device in this holding position.
- a first encapsulation material in a fluid state is brought into the hollow mold in such a way that the first encapsulation material in the hollow mold surrounds a first area of the component in the holding position and a second area of the component remains free from the first encapsulation material.
- a second encapsulation material is then brought into the hollow mold in a fluid state in such a way that the second encapsulation material in the hollow mold surrounds the second region of the component.
- An underwater antenna is usually exposed to the influence of the surrounding water over a long period of time.
- the encapsulation to be produced protects the component from the surrounding water, in particular from mechanical and chemical influences, and in an application from corrosion.
- the casting process is carried out using a casting process and with the help of two fluids
- the outer contour of the casing can be determined by the contour of the hollow mold that belongs to the component and that belongs to the casting mold. Particularly when the casing is of considerable thickness, the encapsulation often takes less time than the spraying of fluid material. If the overmold is to be of uniform thickness, the risk of the actual thickness varying along the surface of the component is reduced. According to the solution, the component is brought into the holding position relative to the hollow mold and held in the holding position, first by the holding device and then by the first casting material in the hollow mold.
- the contour of the hollow mold pointing to the component defines the outer contour of the casting around the first region of the component, and the outer surface and the holding position of the component in the first hollow mold define the internal contour of this casting. Because the component is held in the holding position and cannot move relative to the hollow mold, while first the molding material and then the second
- pouring the casting material into the hollow mold can ensure that the actual outer contour and the actual inner contour of the casting around the first area resemble a required outer contour or a required inner contour. In particular, it can be ensured that the casting has a desired uniform thickness throughout.
- the holding device first and then the first casting material in the hollow mold hold the component in the holding position. It is made possible for the holding device to be located completely outside the hollow mold. In this case, the first encapsulation material does not flow around the holding device, and the holding device does not impair the encapsulation and does not lead to holes in the encapsulation around the first area. Such holes, which originate from the holding device, are generally undesirable and would have to be filled later.
- the method according to the solution saves the need to carry out such a subsequent step for filling the holes.
- the holding device also affects the step of placing the first molding material into the hollow mold less than other possible configurations and does not necessarily need the first one
- the method according to the solution offers two further degrees of freedom, namely on the one hand the point in time at which the holding device is removed from the component, and on the other hand the point in time at which it is started to fill the second casting material into the hollow mold.
- the period of time that has elapsed since the start of the casting these times should be as short as possible.
- the time at which the holding device is removed from the component should be so long that the first encapsulation material, which surrounds the first region of the component, holds the component securely in the holding position without the holding device.
- the component is first held floating in the holding position (in the hollow form) by the holding device, i.e. the component is not on a surface.
- the holding device i.e. the component is not on a surface.
- Holding device releases the component without the first casting material holding the holding device in the holding position.
- the same encapsulation material is used as both the first and the second encapsulation material. It is also possible that the first encapsulation material differs from the second encapsulation material, e.g. with regard to a mechanical or electrical or chemical property and / or the acoustic permeability.
- the step of bringing the first casting material into the hollow mold is carried out in such a way that the first casting material is conveyed vertically or obliquely upwards into the hollow mold.
- the kinetic energy of the ascending first encapsulation material counteracts the weight of the component, so that the risk is reduced that the component performs an undesired movement relative to the hollow shape.
- the first casting material is conveyed vertically or diagonally upwards into the first hollow mold and draws air bubbles upwards. The component floats on the first casting material. The risk is reduced that air bubbles remain in the first encapsulation material, which is undesirable.
- the casting mold comprises
- the step of bringing the component into the holding position comprises the step of bringing the component into the holding position relative to the first hollow part.
- the step of placing the first molding material into the hollow mold comprises the step of placing the first molding material into the first hollow part. This step causes the first
- Holding device becomes the component of the first casting material in the first
- the step of bringing the second casting material into the hollow mold comprises the step of bringing the second casting mold part into a casting position, in which, relative to the component held by the first casting material
- the second hollow part surrounds the second area
- the two hollow mold parts together form the cavity in which the second encapsulation material is placed and which surrounds the component.
- This step is preferably carried out after the holding device has been removed from the component.
- the holding device does not hinder the step of bringing the second mold part into the casting position. In particular, the risk of a collision is avoided.
- the first casting material in the hollow mold hardens completely and then holds the component in the holding position. It is possible that the holding device holds the component until the first casting material is completely hardened. After that, the second
- pouring material placed in the mold This possible configuration requires that the second casting material is subsequently connected to the fully cured first casting material. As a rule, this connection is only possible if the hardened first casting material has previously been mechanically treated, for example cleaned and / or roughened.
- the step of placing the second casting material into the hollow mold is started when the first casting material is in the hollow mold
- the step is brought about or enables the first one which has not been fully cured
- pouring material combines in the hollow mold with the fluid second casting material to form the continuous casting.
- a preferred embodiment of the method according to the solution therefore provides that the fluid second encapsulation material combines with the first encapsulation material, which is partially but not yet fully cured.
- the partially hardened first casting material ideally holds the component motionless in the holding position. This advantageous embodiment saves the need to mechanically treat the fully cured first casting material. This advantageous embodiment thus saves effort, namely the effort for the mechanical treatment.
- a mechanical treatment could damage the component, in particular a coating of the component to be protected by the encapsulation, or the hardened first encapsulation material.
- the advantageous embodiment excludes this risk.
- the time at which the second casting material is filled into the mold can be chosen as a compromise between the following requirements:
- the period of time must be so short that the first casting material has not yet fully hardened and that the fluid second casting material filled into the hollow mold can bond well with the first casting material.
- the time period should often be as short as possible in order to spend time at the
- the first casting material in the hollow mold preferably gels before the second casting material is brought into the hollow mold.
- the gelling phase thus ends before the step that the holding device is removed from the component.
- a minimum time period and a maximum time period are determined before the method is carried out, in such a way that the first casting material
- the step of placing the second encapsulation material into the hollow mold is started when a period of time has elapsed after the first encapsulation material has been brought into the hollow mold
- the time spans are determined, for example, by experiments in which different time spans are given on a trial basis and the result obtained is evaluated.
- the encapsulation device comprises one
- the step of placing the second molding material into the mold is started in response to the event that the curing sensor has detected that the first molding material in the mold has reached a predetermined degree of curing.
- the holding device is located outside the region of the hollow mold filled with the first encapsulation material. The holding device then does not hinder the step of inserting the first casting material into the Spend hollow shape, and does not lead to holes or recesses in the encapsulation around the first area.
- the holding device prefferably holds the component to be cast in the holding position with the aid of at least two holding elements.
- the holding device comprises
- the step that the component is held in the holding position by the holding device comprises the following steps:
- the vacuum chamber is placed on the second area of the component.
- the vacuum generator creates a vacuum.
- the component is held by the vacuum on the vacuum chamber.
- the first encapsulation material preferably does not reach the vacuum chamber.
- the design with the vacuum chamber leads to a particularly low risk that when the holding device is removed, a force is exerted on the component which moves the component out of the holding position relative to the hollow mold. This movement is undesirable because it can lead to the actual inner contour of the encapsulation deviating from a desired contour.
- the negative pressure generated by the negative pressure generator in the vacuum chamber can be adjusted depending on the weight of the component so that the difference to the ambient pressure is as small as possible and as large as necessary. In the step of separating the holding device from the component to be cast, this pressure difference can be reduced to zero as slowly as necessary. It is possible to measure the weight of the component and the ambient pressure and to carry out a pressure control.
- the step of bringing the component into the holding position is carried out by moving the holding device together with the held component. This configuration saves the need to be part of a first Move the device into the holding position and then have to hold it from the holding device.
- the component in the holding position is above a lower part of the hollow mold.
- Air bubbles can escape upwards from the hollow mold.
- FIG. 1 shows a block of an underwater antenna with five spherical hydrophones.
- FIG. 2 shows a first exemplary embodiment of the encapsulation device with a two-part casting mold while the first encapsulation material is being filled in;
- Fig. 3 shows the first embodiment of FIG. 2, while the second
- FIG. 4 shows a second exemplary embodiment of the encapsulation device with an alternative casting mold while the first encapsulation material is being filled in;
- Fig. 5 shows the second embodiment of FIG. 4, while the second
- the invention is used to provide at least one spherical hydrophone 1 with a casting.
- the hydrophone 1 is intended to be part of an underwater antenna and to generate signals depending on the incident sound waves.
- the hydrophone 1 comprises a piezoelectric body in the form of a hollow sphere.
- the invention can also be used to encapsulate a hydrophone with a different geometric shape, for example a hollow cylinder, or to encapsulate another component of one io
- Underwater antenna are used, for example an electronic arrangement, a circuit board with electronic components or an electrical cable.
- the encapsulation is an electrically conductive layer which is to be applied to the piezoelectric hollow body of the hydrophone 1.
- the hydrophone 1 already has the electrically conductive layer, and an acoustically permeable encapsulation made of a material with a high electrical resistance should be placed around the electrically conductive layer and completely surround the entire electrically conductive layer.
- the encapsulation material is, for example, polyurethane or an epoxy resin, which is mixed with a substance for curing.
- the thickness of the casting should be, for example, 3 mm.
- the encapsulation protects the electrically conductive layer from mechanical damage and chemical influences, reduces the risk of corrosion and brings about a desired isolation of the electrically conductive layer from the surroundings, thereby reducing the risk of an acoustic interference point occurring.
- the hydrophone 1 with the encapsulation is to be received in a spherical recess in the interior of a block of the underwater antenna, and the electrically conductive layer of the hydrophone 1 is to be at a distance from the wall of this recess, the distance being the same at each point.
- 1 shows an example of a cuboid block 10 of an underwater antenna, the block 10 receiving five spherical hydrophones 1, 1.1, ..., 1.4 in five spherical recesses.
- Each hydrophone 1, 1.1, ..., 1.4 is provided with a casting made according to the solution.
- the block 10 can also accommodate a different number of hydrophones, and the hydrophones can also have a different geometric shape or different shapes.
- the block 10 is made of an acoustically permeable solid plastic.
- the signals from the five hydrophones 1, 1.1, ..., 1.4 are processed inside the block 10.
- the processed electrical signals from the five hydrophones 1, 1.1, ..., 1.4 can be tapped at a coupling point 30.
- Block 10 also includes two cutouts 29.1, 29.2, through which two screws can be passed to secure the block 10.
- the layer which is to be produced by the method according to the solution on the hydrophone 1 and the further hydrophones 1.1, 1.2, ... should have the same thickness at every point, and the outer surface of the encapsulation should have the shape of an ideal one Ball or at least come close to this ideal shape.
- placing a casting around the electrically conductive layer the electrically conductive layer must not be damaged during the production of the casting, in order to avoid an acoustic interference point.
- the casting itself should not lead to an acoustic fault.
- the encapsulation can also have another desired geometric shape, and the encapsulation can have different desired thicknesses in one application.
- first casting material UM.1 is filled into a hollow mold in a first phase and a second molding material UM.2 in a subsequent second phase.
- first casting material UM.1 and “second casting material UM.2” are used for clarification.
- These two casting materials UM.1 and UM.2 can differ, for example in terms of acoustic permeability or a mechanical or chemical parameter. It is also possible that the same casting material is filled in in both phases.
- FIGS. 2 and 3 A first exemplary embodiment of the invention is shown in FIGS. 2 and 3.
- the casting mold used has a first part 5.1 arranged at the bottom and a second part 5.2 arranged at the top.
- An upper hollow mold 6.1 is provided in the first part 5.1
- a lower hollow mold 6.2 is provided in the second part 5.2. If the two parts 5.1 and 5.2 are arranged flat against one another, the two hollow molds 6.1 and 6.2 together form a spherical recess in the two-part mold 5.1, 5.2. This spherical recess is slightly larger than the hydrophone 1.
- a feed channel 3 leads from below through the first part 5.1 to the lower hollow mold 6.1.
- a feed channel 4 leads from above through the second part 5.2 to the upper hollow mold 6.2.
- the hydrophone 1 to be cast is temporarily held by a holding device 2.1, which is arranged completely outside the lower hollow mold 6.1 of the first part 5.1 and is at a distance from the first part 5.1.
- the holding device 2.1 is designed as a suction device which has a vacuum generator 13 and a vacuum chamber 9. This vacuum chamber 9 is brought into a flat, airtight contact with the upper half of the hydrophone 1, and thereby the hydrophone 1 is held in such a way that the hydrophone 1 cannot move relative to the holding device 2.1.
- the vacuum generator 13 creates a vacuum in the vacuum chamber 9, which compensates for the weight of the hydrophone 1. In Fig. 2 the distance between the hydrophone 1 and the vacuum chamber 9 is exaggerated.
- the holding device 2.1 comprises two holding elements, for example two pins or screws, which hold the hydrophone 1 between them without damaging the outer surface of the hydrophone 1.
- the holding device 2.1 designed as a suction device holds the hydrophone 1 in an upper region which extends around the “north pole” of the hydrophone 1.
- the holding device 2.1 with the held hydrophone 1 is brought into a position in which the hydrophone 1 is located in the space which is surrounded by the lower hollow mold 6.1 without touching the wall of the lower hollow mold 6.1.
- the distance between the held hydrophone 1 and the lower hollow mold 6.1 is approximately the same at every point.
- the “equator” of the hydrophone 1 is preferably located within the space surrounded by the lower hollow mold 6.1.
- the second part 5.2 is not required in the first embodiment.
- a first encapsulation material UM.1 is fed in a fluid state through the feed channel 3 vertically from below into the lower mold 6.1.
- the hydrophone 1 is still held by the holding device 2.1.
- the kinetic energy of the rising first encapsulation material UM.1 counteracts the weight of the hydrophone 1, so that the risk is reduced that the hydrophone 1 being held performs an undesired movement.
- the introduced first encapsulation material UM.1 surrounds the hydrophone 1, and the upper mirror Sp of the introduced encapsulation material UM.1 rises in the space which is surrounded by the lower hollow mold 6.1.
- the upper mirror Sp is indicated in FIG. 2.
- the supply of the first casting material UM.1 is ended. It is possible to measure the fill level in the lower hollow mold 6.1 or also the amount of the first casting material UM.1 fed in and depending on the result of this measurement to stop the supply of further first casting material UM.1. For example, the supply is ended when the upper mirror Sp of the first encapsulation material UM.1 has reached the equator of the hydrophone 1. The process is now initiated or enables the first casting material UM.1 to harden in the surrounding space.
- the hydrophone 1 surrounded by the first encapsulation material UM.1 is still held by the holding device 2.1, preferably during the entire gelling period.
- the holding device 2.1 is then separated from the hydrophone 1 when the first encapsulation material UM.1 has hardened to such an extent that the first encapsulation material UM.1 can now carry the hydrophone 1 alone without the hydrophone 1 being carried relative to it the lower part 5.1, but is not yet fully cured.
- the holding device 2.1 is preferred by the hydrophone 1 in the pot period separately.
- the holding device 2.1 is separated when the molecular chains of the filled first casting material UM.1 have reached a sufficient degree of crosslinking.
- experiments with defined operating conditions and measured ambient conditions determine beforehand how long it takes until after filling the poured-in first encapsulation material UM.1 has hardened to such an extent that it can carry the hydrophone 1 and an undesired relative Movement is avoided, but can still combine with the second casting material UM.2.
- These tests provide a period of time which is as long as necessary and as short as possible and which is then used in productive operation to initiate the process of separating the holding device 2.1 from the hydrophone 1. The period usually also depends on the properties of the first UM.1 casting material.
- a curing sensor 20 measures the state of the filled in first encapsulation material UM.1 in order to determine when the first encapsulation material UM.1 has cured sufficiently.
- This curing sensor 20 preferably works without contact.
- an infrared sensor non-contact measures a measure of the current C-C double bond of the filled first encapsulation material UM.1. Or its degree of polymerization is measured. It is also possible to use a method of magnetic resonance spectroscopy.
- the second embodiment avoids the need to set and maintain predetermined operating conditions and ambient conditions exactly as in the previous experiments when casting over the hydrophone 1, and is therefore a regulation and not a controller like the first embodiment.
- the step of separating the holding device 2.1 from the hydrophone 1 is carried out such that ideally no force is exerted on the hydrophone 1 during the separation. For example, the ambient pressure is measured and the negative pressure generated is slowly increased to the ambient pressure until the holding device 2.1 designed as a suction device no longer exerts any force on the Exercises hydrophone 1, and then the holding device 2.1 is moved away from the hydrophone 1 still held. After the separation, the first phase is over.
- the step of separating the holding device 2.1 from the hydrophone 1 is carried out in both exemplary embodiments before the first encapsulation material UM.1 has completely hardened.
- the second phase is started.
- the second part 5.2 is placed flat on the first part 5.1, in such a way that the second part 5.2 does not touch the hydrophone 1 and, in particular, no undesired force on the hydrophone 1 held or on the first Pouring material UM.1 is exercised.
- 3 shows the situation after the second part 5.2 has been placed flat on the first part 5.1.
- the two hollow molds 6.1 and 6.2 now together form a spherical cavity which surrounds the hydrophone 1, ideally such that the distance between the wall of this spherical cavity 6.1, 6.2 and the outer surface of the hydrophone 1 is the same at every point.
- a second encapsulation material UM.2 is now introduced in a fluid state through the upper feed channel 4 from above into that space which is surrounded by the upper hollow mold 6.2 in the second part 5.2.
- the introduced second encapsulation material UM.2 flows around the held hydrophone 1 and reaches the upper mirror Sp of the first encapsulation material UM.1.
- the supply of further fluid second encapsulation material UM.2 is stopped. The process is initiated or enables the second casting material UM.2 to harden.
- the fluid second encapsulation material UM.2 introduced chemically combines with the not yet fully cured first encapsulation material UM.1 to form a continuous encapsulation around the hydrophone 1.
- the achieved connection strength of this continuous encapsulation is almost as large as the inherent strength of the UM.1 and UM.2 casting materials.
- the second part 5.2 remains in the position shown in FIG. 3 until both the first encapsulation material UM.1 and the second encapsulation material UM.2 are completely cured and a cured continuous encapsulation is formed around the hydrophone 1.
- the second part 5.2 is removed again and the hydrophone 1 is removed from the lower mold 6.1.
- the holding device 2.1 for removing the hydrophone 1, for example the suction device with the vacuum chamber 9, or a holding device with two holding elements. It is avoided that the holding device 2.1 mechanically damages the casting.
- FIG. 4 A second exemplary embodiment of the invention is shown in FIG. 4 and in FIG. 5.
- the same components have the same reference numerals as in Fig. 2 and Fig. 3.
- a mold 7 is used, which also comprises two parts 7.1 and 7.2, each with a hollow mold 11.1 and 11.2, the two parts 7.1 and 7.2 but provide a spherical hollow mold 8 during the entire casting process and not only during the second phase.
- This spherical hollow mold 8 is formed by the two hollow molds 11.1 and 11.2 and, as in the first exemplary embodiment, is somewhat larger than the hydrophone 1 to be cast around.
- a holding device 2.2 designed as a suction device engages from above through the feed channel 4 into the cavity 8.
- the casting mold 7 consists of the two parts 7.1, 7.2, and in FIG. 4 and in FIG. 5 the dividing line T between these two parts 7.1 and 7.2 is shown in broken lines.
- the suction device 2.2 holds the hydrophone 1 by means of the negative pressure.
- the upper part 7.2 together with the suction device 2.2 and the hydrophone 1 held and to be cast around is placed on the lower part 7.1 from above.
- the hydrophone 1 is inserted into the hollow mold 11.1 from above such that the hydrophone 1 does not touch the wall of the hollow mold 11.1.
- the upper part 7.2 holds the suction device 2.2, and the held suction device 2.2 holds the hydrophone 1 such that the distance between the hydrophone 1 and the cavity 11.1 is ideally the same at every point.
- the spherical cavity 8 is formed and surrounds the hydrophone 1.
- FIG. 4 shows the situation that has arisen after the upper part 7.2 with the suction device 2.2 and the hydrophone 1 is placed on the lower part 7.1 and the cavity 8 completely holds the hydrophone 1 held surrounds. 4 shows this situation.
- the first encapsulation material UM.1 is again filled in from below through the feed channel 3 and rises in the cavity 8, for example up to a little above the “equator” of the hydrophone 1.
- the encapsulated first encapsulation material UM.1 partially hardens.
- the holding device 2.2 designed as a suction device is separated from the hydrophone 1, for example by gradually suppressing the suppression by regulation or control and then moving the holding device 2.2 upwards through the feed channel 4. This concludes the first phase.
- the hydrophone 1 is now held in the hollow mold 8 by the partially hardened first casting material UM.1. 5 shows this situation.
- the second encapsulation material UM.2 in a fluid state is filled from above through the feed channel 4 into the cavity 8.
- the second encapsulation material UM.2 flows around the carried hydrophone 1 and connects to the already partially cured first encapsulation material UM.1, and the two encapsulation materials UM.1 and UM.2 in turn form a continuous, solid encapsulation around the hydrophone 1.
- the hydrophone 1 is removed from the hollow mold 8, for example by the suction device 2.2 again generating negative pressure and the upper part 7.2 with the suction device 2.2 and the held hydrophone 1 being moved away from the lower part 7.1.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019201007.5A DE102019201007A1 (en) | 2019-01-28 | 2019-01-28 | Pouring process and potting device for an underwater antenna |
PCT/EP2020/051377 WO2020156880A1 (en) | 2019-01-28 | 2020-01-21 | Casting method and casting device for an underwater antenna |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3917744A1 true EP3917744A1 (en) | 2021-12-08 |
Family
ID=69185607
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP20701455.6A Pending EP3917744A1 (en) | 2019-01-28 | 2020-01-21 | Casting method and casting device for an underwater antenna |
Country Status (3)
Country | Link |
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EP (1) | EP3917744A1 (en) |
DE (1) | DE102019201007A1 (en) |
WO (1) | WO2020156880A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102021006259A1 (en) | 2021-12-20 | 2022-02-24 | Daimler Ag | Battery with a battery module and with a frame element |
CN114750433B (en) * | 2022-03-25 | 2023-09-05 | 中国电子科技集团公司第三十八研究所 | Double-edge variable-section thin-wall composite material antenna tube RTM (real time kinematic) die and forming method |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1227582A (en) * | 1959-05-26 | 1960-08-22 | Manufacturing process of decorative objects and products obtained | |
DE1704483A1 (en) * | 1967-07-14 | 1971-05-19 | Barnette Stanley Ronald | Plastic product |
GB1552381A (en) * | 1977-04-26 | 1979-09-12 | Graseby Instruments Ltd | Encapsulation process |
JP2731058B2 (en) * | 1991-11-13 | 1998-03-25 | 株式会社エンプラス | Synthetic resin coating equipment by injection molding |
JPH07283441A (en) * | 1994-04-15 | 1995-10-27 | Toshiba Corp | Optical semiconductor device and manufacture thereof |
DE19518461C1 (en) * | 1995-05-19 | 1996-06-13 | Stn Atlas Elektronik Gmbh | Underwater towing antenna |
JPH10119062A (en) * | 1996-10-22 | 1998-05-12 | Oki Electric Ind Co Ltd | Mold for forming watertight structure and method for forming molding for forming watertight structure |
DE10047241C1 (en) * | 2000-09-23 | 2002-08-08 | Stn Atlas Elektronik Gmbh | Underwater towed antenna |
FR2820074B1 (en) * | 2001-01-31 | 2003-05-02 | Bardot Cps | METHOD FOR INTEGRATING AN ELECTRONIC COMPONENT INTO A MOLDED PRODUCT AND MOLDED PRODUCT THUS OBTAINED |
DE102004038033B3 (en) * | 2004-08-05 | 2005-10-13 | Atlas Elektronik Gmbh | Method for producing an antenna section of an underwater antenna and antenna section for a planar underwater antenna |
DE102008052354A1 (en) * | 2008-10-20 | 2010-04-22 | Atlas Elektronik Gmbh | Underwater antenna |
DE102009008947A1 (en) * | 2009-02-13 | 2010-08-19 | Dagmar Bettina Kramer | Method for producing an LED light |
DE102016118238A1 (en) * | 2016-09-27 | 2018-03-29 | Atlas Elektronik Gmbh | UNDERWATER ANTENNA FOR A UNDERWATER VEHICLE AND SLEEPING BODY WITH SUCH A UNDERWATER ANTENNA |
-
2019
- 2019-01-28 DE DE102019201007.5A patent/DE102019201007A1/en active Pending
-
2020
- 2020-01-21 EP EP20701455.6A patent/EP3917744A1/en active Pending
- 2020-01-21 WO PCT/EP2020/051377 patent/WO2020156880A1/en unknown
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WO2020156880A1 (en) | 2020-08-06 |
DE102019201007A1 (en) | 2020-07-30 |
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