摘要:
In an embodiment, a long reinforcing material-attached profile strip (100) in which joint portions are formed at both side edge portions and to which a reinforcing material continuously formed in the longitudinal direction is attached is supplied, and mutually adjacent joint portions are joined to each other, thereby producing a spiral pipe (S). A curl-forming apparatus (3) includes a sending roller for the reinforcing material-attached profile strip (100) and a curl guide. Using the curl-forming apparatus (3), adjacent parts of the reinforcing material-attached profile strip (100) are subjected to plastic deformation to form spirals by being provided with arc-like curls having a radius of curvature substantially similar to or not greater than the radius of curvature of the spiral pipe (S). Accordingly, the spiral pipe (S) can be produced while suppressing the action of a restoring force that restores the reinforcing material-attached profile strip (100) to its original radius of curvature.
摘要:
In order to produce industrially advantageously an electroformed copper/niobium composite piping material wherein an electroformed copper layer and a niobium thin piping material are strongly bonded to each other, the electroformed copper/niobium composite piping material can be produced by coating any one or each of the outer peripheral surface and the inner peripheral surface of a niobium thin piping material with a nickel thin film, coating the surface of the nickel thin film with copper by electroforming, and subsequently annealing the resultant.
摘要:
Provided are a seamless bent pipe constituted by a bent section and straight pipe sections on both ends of the bent section, with the inside diameter at each pipe end portion being larger than the inside diameter of the bent section, and a welded component comprising a seamless bent pipe and a seamless straight pipe at one or each end of the seamless bent pipe, with the end of the seamless straight pipe to be welded to one or each end of the seamless bent pipe having the same inside diameter as the inside diameter of the seamless bent pipe, as well as methods of manufacturing them. As a result, elements suited for use in pipelines can be obtained, without unnecessarily increasing the wall thickness of the seamless bent pipe and without internal machining of the pipe end portions of the seamless bent pipe after the manufacturing thereof.
摘要:
A method for the direct manufacture of aerospace duct elements is provided comprising executing a single build run on a build chamber using direct fabrication technology to generate at least one duct section. The at least one duct section is generated by forming a plurality of partial cylinder duct segments orientated within the build chamber in a nested arrangement during the single build run, and assembling at least two of the partial cylinder duct segments to form the duct section. During the single build run a plurality of stiffening protrusions are formed on each of the partial cylinder duct segments to improve duct rigidity and to modify flow through the duct section.
摘要:
The invention pertains to a flat product in the form of a wall for a heat exchanger that is operated with cooling mediums in the form of corrosive liquids that contain biological organisms. In order to protect the wall of the heat exchanger against corrosion on the side that comes in contact with the cooling medium and to prevent biological organisms from settling down on the heat exchanger wall, the wall consists of a titanium or titanium alloy layer and a copper/titanium alloy layer that is integrally connected to the titanium or titanium alloy layer by means of an intermediate alloy layer.
摘要:
A method for manufacturing a solid housing, in particular a valve housing for an electromagnetically operable valve. The method includes providing at least three flat metal plates side by side, each having different magnetic properties directly adjacent to the others. The at least three plates are joined to the directly adjacent bordering edges to form a sheet metal section. The sheet metal section shaped into a sleeve shape. Furthermore, the bordering edges, which are now opposite one another, and run in the longitudinal direction of the sleeve to form a sleeve blank are joined together. The sleeve blank is machined until a desired geometric shape of the housing is achieved. The housing may be suitable in particular for use in fuel injectors in fuel injector systems of internal combustion engines operating by spark ignition of a compressed fuel-air mixture.
摘要:
A small diameter metal tube having at least two inner diameters is provided. A method for producing this metal tube is also provided. In this method, a plate member having a development shape of the metal tube is blanked from a metal thin plate so that the plate member is left partly tied to the metal thin plate, the plate member is press formed into a tubular body having the at least two inner diameters, and the plate member partly tied to the metal thin plate is cut apart to produce the metal tube having at least two inner diameters.
摘要:
A small diameter metal tube having at least two inner diameters is provided. A method for producing this metal tube is also provided. In this method, a plate member having a development shape of the metal tube is blanked from a metal thin plate so that the plate member is left partly tied to the metal thin plate, the plate member is press formed into a tubular body having the at least two inner diameters, and the plate member partly tied to the metal thin plate is cut apart to produce the metal tube having at least two inner diameters.
摘要:
The invention relates to a support (1) for rolling cylindrical elements, this support comprising first guide means (2) capable of guiding the cylindrical elements at a height z1. Downstream, in a direction in which the cylindrical elements roll, the said support (1) comprises second guide means capable of guiding the cylindrical elements at a height z2 higher than z1, the friction between the second guide means and the cylindrical elements being lower than the friction between the first guide means (2) and the cylindrical elements.
摘要:
The manufacture of seamless tubes in which the process includes providing an assembly having a metal tube blank, and an elongate metal core of shape memory effect material which is surrounded and contacted by the tube blank with a minimal gap. The assembly is elongated by mechanical working thereof at an elevated temperature until the tube blank has been converted into a tube of desired dimensions. After the elongation step, the core is subjected to a treatment which results in the core being in a stretched condition throughout its length, and does not substantially stretch the tube. The core is removed from the tube, and subsequently subjected to drawing passes over a nondeformable mandrel thereby refining the precision of diametric and wall dimensions with improved ID and OD surface quality. There is also decoring and reinserting to improve final dimensions which results in the ability to fabricate smaller, longer tubes.