Messerschmitt-bolkow-blohm Gmbh

Messerschmitt-boelkow-blohm Gmbh

Messerschmitt-bolkow-blohm Gesellschaft MIT Beschrankter Haftung

Manfred Lechner

Karl Butter

Kurt Stich

Willibald Wittich, Deceased

Dieter Kunzmann

Helmut Dederra

Volker Schirm

By Renate Wittich Nee Padberg, Legal Guardian

Heinrich Dettmann

Manfred Christl

Michael Kaufmann

A pipe section, especially an elbow pipe section, is cast to have an internal heat insulation lining so that the pipe section can withstand temperatures up to about 2500.degree. C. The internal heat insulation is first formed as a hollow casting core of carbon fiber composite material which, after curing, is inserted into a casting mold to function as the casting core which then becomes the internal heat insulation of the pipe section as the result of the casting of the pipe section, whereby the carbon fiber composite material is bonded to the interior surface of the pipe section.

Method for producing a pipe section with an internal heat insulation

An apparatus and method for fixedly positioning a rotationally symmetrical constructional part having an irregular longitudinal peripheral wall consisting of a plurality of spirally wound juxtaposed tubes. The apparatus comprises a rotatable core having a peripheral surface corresponding to the inner contour of the peripheral wall for supporting the tubes with means for rotating the core about the axis of symmetry. Clamping devices are included for fixedly positioning the ends of the tubes on the core. A wire wrapping device is positioned alongside the core for applying a removable temporary wire wrapping of non-circular wire cross-section under tensile stress to the surface of the tubes. The wrapping device includes guide devices for guiding the wire to the surface of the tubes in a plane substantially perpendicular to the axis of symmetry and for maintaining the wire under a selected tensile stress so that it is helically wound in successive contacting turns over the tubes, and a device for effecting a change in the elevation of the wire wrapping device depositing the wire on the tubes during heating of successive turns of the wire. The apparatus and method cause the successive contacting turns of wire to closely and forcefully apply against preceding turns of wire and against the tubes for forming the constructional part.

Method for manufacturing a rotationally symmetrical construction part

The constructional parts have walls formed of elongated elements, such as res or tubes, wound spirally in juxtaposition about the axis of symmetry of the part and connected to each other. The elongated elements are bent to shape utilizing a bending device having at least one bending groove conformable to the predetermined three-dimensional geometry of the part to be manufactured. One end of each wire or tube is fixed to the bending device and the other end is engaged in a clamping and adjusting device designed as a combined Cardan swivel joint which, during the bending, it utilized to continuously control the adjustment parameters of the wire or tube, about three mutually intersecting axes, in conformity with such predetermined three-dimensional geometry of the part. The bent elements are then assembled in juxtaposition on an assembly core, separate from the bending device, having an external contour identical with the internal contour of the finished part, and the opposite ends of assembled juxtaposed elements are clamped against movements. The juxtaposed elements are then wrapped with a wire winding extending completely over the juxtaposed elements. The wire winding is then removed, by sectors or zones or areas, and the thus-exposed juxtaposed elements are then secured to each other, in the exposed zones, as by welded seams, to form the finished constructional part when the wire wrapping has been completely removed and all of the juxtaposed elements have been secured to each other.

Method and apparatus for manufacturing rotationally symmetrical

In a heat exchanger wall construction, such as used in regeneratively cooled combustion chambers for liquid fueled rocket engines, the wall construction consists of an inner wall with cooling channels spaced apart by webs. The cooling channels are open on one surface of the inner wall. An outer wall contacts the webs of the inner wall and forms a closure over the openings from the cooling channels. The outer wall consists of an intermediate layer electro-deposited on the surface of the inner wall in which the cooling channels are formed so that it provides a closure surface for the channels. The surfaces of the channels within the inner wall are coated by electro-depositing a layer of gold on them. After forming the gold layer on the surfaces of the cooling channels, the outer surfaces of the webs are etched so that the gold layer extends outwardly from the outer surface of the webs. Next the intermediate layer is deposited and it can be either a single layer or multi-layered. The inner surface of the intermediate layer, whether it is of a single or multi-layered construction, is formed of gold. When the intermediate layer is formed of multiple layers, alternating layers of gold and copper are used.

Cooling channel surface arrangement for a heat exchanger wall

The constructional parts have walls formed of elongated juxtaposed tubes, wound spirally about the axis of symmetry of the constructional parts and connected to each other. The tubes are bent to shape by a bending device having at least one bending flank or edge surface conformable to the predetermined 3-dimensional geometry of the part to be manufactured, with one end of each tube being fixed to the bending device and the other end being engaged in a clamping and adjusting device designed as a combined Cardan swivel joint. During bending, the clamping and adjusting device is utilized to continuously control the adjustment parameters of the tube being bent, about three mutually intersecting and perpendicular axes, in conformity with the predetermined three-dimensional geometry of the part, and the radial distance of the swivel joint from the axis of symmetry of the bending device is continuously controlled. A closed-loop control system is provided, and includes an actual-value transmitter, measuring the radial displacement of the swivel joint clamping device relative to the axis of symmetry of the bending device, a reference-value transmitter, having a set point adjusted as a function of the angular displacement between the bending device and the clamping device, and an actuator operating, as a function of the error signal value, to effect radial displacement of the clamping device. The control loop is advantageously designed as an electro-hydraulic system. The control member of the control system may be a cam, or the reference values, which are a function of the angle of rotation, may be determined by means of a digital computer.

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Munich, Germany

Manfred Lechner