Abstract:
The present invention relates to a reinforced structure (1) and a method for manufacturing a reinforced structure (1) of composite material. The reinforced structure (1) comprises a stiffening element (2) which is attached to the concave surface (37) of a shell element (3). The stiffening element (2) comprises a first profile (5A) and a second profile (5B) connected to each other and forming a web (9). The stiffening element (2) further comprises a reinforcing element (7) of composite material having at least one forming bulge (21) on each of its respective sides (31and 33). The forming bulges (21) extend from an outer edge (27) of the reinforcing element (7) to an inner edge (29) of reinforcing element (7). The height of the at least two forming bulges (21) is highest at the outer edge (27), tapers towards the inner edge (29) and is levelled out at the inner edge (29). The reinforcing element (7) is positioned between the first profile (5A) and the second profile (5B) and forms the web (9) of the stiffening element (2).
Abstract:
A mandrel for processing a part comprises an outer sleeve and a generally flexible inner core. The outer sleeve includes at least one flexible portion along its length allowing the sleeve to flex to a desired contour.
Abstract:
The invention relates to a piece made of composite material with areas of different thickness manufactured from a stack of composite material fabrics comprising at least two adjacent areas (11, 15) of different thickness and a transition area (13) between both configured with a single slope (17), in which the stack is structured by: a first and a fourth section formed by at least two continuous fabrics (21, 21'; 29, 29') extending along the three mentioned areas (11, 13, 15); a second section formed by one or more symmetrical and balanced fabric packets (23) ending in the transition area (13) placed among one or more continuous fabrics (25); a third section formed by a symmetrical and balanced fabric packet (27) extending along the three mentioned areas (11, 13, 15) placed among one or more continuous fabrics (25).
Abstract:
A fabrication method of forming a thermoplastic composite laminate material (20) with tailored and varying thickness (tl, t2) in a continuous process. This process utilizes automated equipment or hand lay-up to collate parts or components into a multi-layer stack (74, 76). Each stack contains all plies, including ply build-up areas, tacked in the proper location to maintain orientation and location. The consolidation tooling contains all necessary part features and is coordinated to the customized multiple ply stacks to form a single integrated thermoplastic composite laminate potentially having areas of 10 differing thickness from these multiple ply stacks.
Abstract:
A plastic leaf spring to be used in motor vehicle construction consists in resilient regions (15, 17, 25) of a plurality of cured duromeric plastic laminate strips (1) reinforced with high strength fibers aligned substantially in the direction of the maximum elongation or compression of the fiber material occuring under spring load, the said resilient regions (15, 17, 25) being said strips (1) bonded together by an adhesive and eventually being bonded to a second resilient element or to another appropriate element. For the preparation of this leaf spring the said fiber reinforced cured duromeric plastic laminates are produced continuously as an endless strip which is cut to lengths of strips (1). A plurality of these strips (1) - after coating with a duromeric bonding agent - are bonded to each other in a mold (7, 8) and to any appropriate additional components with activation and curing the bonding agent to form a resilient composite part (15) of the leaf spring.
Abstract:
Straight plastic profiles (10) made of plastic and a continuous reinforcement (11) made of fibers, woven and/or knitted fabrics, are predominantly produced continuously in one strand (13). Said production is typically performed using the pultrusion method. Due to the fact that the plastic profile (10) is pulled through a mold (20) by a take-off device, only straight plastic profiles (10) can be formed with the known methods of the described type, in particular with the known pultrusion methods. During the production of plastic profiles (10) with semi-finished products and/or complex fiber structures, accumulation of the fiber structures and/or semi-finished products can occur on entry into the mold (20) and thereby lead to solidification of the material so that the process must be stopped. The invention provides a method and a device for simple production of individually formed plastic profiles (10). This is achieved by the mold (20) being formed of at least two separate molded parts (14, 15), relative to the cross-section of the plastic profile (10), which are moved at different times in a direction opposite to a direction of production (19) of the plastic profile (10) along a section of the same plastic profile (10).
Abstract:
Kunststoffgegenstände, insbesondere Kunststoffprofile (30), werden überwiegend in einem Strang hergestellt und zwar vorzugsweise im Pultrusionsverfahren. Dabei wir das Kunststoffprofil durch eine Form (31) gezogen. Dadurch, dass das Kunststoffprofil von einer Abzieheinrichtung durch die Form gezogen wird, lassen sich nur Kunststoffprofile bilden, die der Kraft bzw. dem Anpressdruck der Abzieheinrichtung standhalten. Daher sind bisher nur Kunststoffprofile herstellbar, die ausreichende Wandungsstärken aufweisen. Erfindungsgemäß ist es vorgesehen, dass mindestens ein Teil einer Form periodisch relativ zum stillstehenden dünnwandigen Kunststoffprofil bewegt wird und das dünnwandige Kunststoffprofil während des Entlangbewegens der Form auf den relativ zu derselben stillstehenden dünnwandigen Kunststoffprofil von mindestens einem einen Kern (37) und ein äußeres Halteteil (36) aufweisenden Haltemittel (35) bzw. Greifer festgehalten wird.
Abstract:
A contoured composite structure is fabricated by laying up a composite charge that includes at least one ply formed by uni-directional fiber pre-preg ply segments having substantially constant widths. The ply segments are placed in side-by-side, overlapping relationship with their longitudinal centerlines aligned in a polar orientation related to the contour of the structure. The charge is formed into the shape of the structure and cured.
Abstract:
A stiffener (24) has an elongate web (30) element and at least one elongate foot element (28), the web element and foot element being connected by a curved elbow, wherein the radius of the curved elbow is greater over a first portion (C) of the stiffener than over a second portion (E) of the stiffener. A roll forming die (32) comprises first (34) and second (36) rollers, the first roller having a shaped section arranged to be located within a correspondingly shaped recess in the circumferential surface of the second roller, the first and second rollers defining a gap (40) there between corresponding to the desired shape to be imparted on an elongate member (20) passed between the rollers, the desired shape including a curved elbow between a web and a foot portion, wherein the shape of the recess in the second roller and the shape of the corresponding section of the first roller vary around a portion of the rollers circumference such that the radius of curvature of the gap between the rollers corresponding to the curved elbow varies between a minimum and a maximum value. The stiffener is formed by feeding an elongate member through the roll forming die and rotating the die rollers between a first and a second position as a portion of the elongate member is fed between the die rollers, whereby the radius of the curved elbow formed in the stiffener is varied.