Screen and method of making the same

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 33/067 (2006.01) B01D 29/11 (2006.01) B01D 33/00 (2006.01) B01D 35/30 (2006.01) B07B 1/18 (2006.01) D21D 5/16 (2006.01)

Patent

CA 2414011

A screening assembly (30) and method where each support ring (52, 54) is bonded to a perforate screen section (36) by bonding material (116) that preferably is brazing material. There is a joint (112, 114) between each ring and section in which material is deposited. The joint includes mating faying surfaces (100, 102, 106, 108) offset relative to an axis of the assembly. In making it, sections and rings are assembled with material disposed in each joint. The material is heated to a temperature at or above which brazing occurs. Preferably, the sections are also annealed as a result of heating. In another preferred method, heating also causes boron diffusion of the section to occur. To ensure that the faying surfaces are wetted with molten brazing material, a vacuum is applied at least during brazing.

La présente invention concerne un ensemble de criblage (30) et un procédé, selon lequel chaque anneau de support (52, 54) est lié à une section de crible perforée (36) par une matière de liaison (116), de préférence un produit d'apport de brasage fort. Un joint (112,114) est placé entre chaque anneau et chaque section, dans lequel le produit d'apport est déposé. Le joint précité comprend des surfaces de liaison correspondantes (100, 102, 106, 108) décalées par rapport à un axe de l'ensemble. Lors de la fabrication, on assemble les sections et les anneaux en déposant du produit d'apport de brasage dans chaque joint. On chauffe le produit d'apport à une température supérieure ou égale à la température de brasage. De préférence, les sections sont aussi recuites à cause de l'échauffement. Dans un autre procédé préféré, l'échauffement entraîne également la diffusion du bore de la section. Afin de garantir l'humidification des surfaces de liaison par le produit de brasage fondu, on applique un vide au moins pendant le brasage.

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