A method to manufacture a tubular element for transferring abrasive materials such as concrete, inert materials or suchlike, wherein the tubular element comprises an internal tubular component made of chromium carbide or other wear-resistant material, and an internal tubular component in contact with and coaxial to the internal tubular component and made of composite material.
F16L 57/06 - Protection of pipes or objects of similar shape against external or internal damage or wear against wear
B22D 13/02 - Centrifugal castingCasting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
B22D 19/02 - Casting in, on, or around, objects which form part of the product for making reinforced articles
B65G 53/32 - Conveying concrete, e.g. for distributing same at building sites
A method to make a tubular element to transfer abrasive materials such as concrete, inert materials or suchlike, where the tubular element includes an external tubular component made of steel and an internal tubular component, coaxial to the external tubular component, where the internal tubular component is made of chromium carbide, or other similar material resistant to wear.
B22D 13/02 - Centrifugal castingCasting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
B22D 19/08 - Casting in, on, or around, objects which form part of the product for building up linings or coverings, e.g. of anti-frictional metal
B21C 37/15 - Making tubes of special shapeMaking the fittings
F16L 9/18 - Double-walled pipesMulti-channel pipes or pipe assemblies
F16L 57/06 - Protection of pipes or objects of similar shape against external or internal damage or wear against wear
B22D 13/10 - Accessories for centrifugal casting apparatus, e.g. moulds, linings thereforMeans for feeding molten metal, cleansing moulds or removing castings
C22C 29/06 - Alloys based on carbides, oxides, borides, nitrides or silicides, e.g. cermets, or other metal compounds, e. g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
F16L 9/14 - Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
B65G 53/32 - Conveying concrete, e.g. for distributing same at building sites
F16L 9/10 - Rigid pipes of glass or ceramics, e.g. clay, clay tile, porcelain
3.
Pipe for conveying abrasive materials such as concrete, apparatus and method for producing said pipe
A method and apparatus for producing a curved tubular segment includes obtaining a curved external tubular element and a curved internal tubular element. The curved internal tubular element is made of a material having a resistance to wear greater than that of the curved external tubular element and has a cross section such as to cover at least part of the internal surface of the curved external tubular element. The curved internal tubular element is inserted inside the curved external tubular element after heating the latter by a heating unit. To form the curved external tubular element on the exact geometry of the curved internal tubular element, a molding unit and a cooling unit are used to obtain a curved tubular segment without spaces between the curved external tubular element and the curved internal tubular element.
B23P 11/02 - Connecting or disconnecting metal parts or objects by metal-working techniques, not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluidsConnecting or disconnecting metal parts or objects by metal-working techniques, not otherwise provided for by making force fits
B21D 39/04 - Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by platingTube expanders of tubes with tubesApplication of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by platingTube expanders of tubes with rods
F16L 58/10 - Coatings characterised by the materials used by rubber or plastics
Method and apparatus for producing a curved tubular segment (10) comprising obtaining a curved external tubular element (11) and a curved internal tubular element (12) made of a material having a resistance to wear greater than that of the curved external tubular element (11) and having a cross section such as to cover at least part of the internal surface (13) of the curved external tubular element (11). It provides the insertion of the curved internal tubular element (12) inside the curved external tubular element (11) after heating the latter by means of a heating unit (29). Moreover, to form the curved external tubular element (11) on the exact geometry of the curved internal tubular element (12) a molding unit (25, 31) and a cooling unit (30) are used to obtain a curved tubular segment (10) without spaces between the curved external tubular element (11) and the curved internal tubular element (12).
F16L 57/06 - Protection of pipes or objects of similar shape against external or internal damage or wear against wear
B65G 53/32 - Conveying concrete, e.g. for distributing same at building sites
B23P 11/00 - Connecting or disconnecting metal parts or objects by metal-working techniques, not otherwise provided for
B23P 11/02 - Connecting or disconnecting metal parts or objects by metal-working techniques, not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluidsConnecting or disconnecting metal parts or objects by metal-working techniques, not otherwise provided for by making force fits
B21C 37/15 - Making tubes of special shapeMaking the fittings
B21D 39/04 - Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by platingTube expanders of tubes with tubesApplication of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by platingTube expanders of tubes with rods
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