Metal fusion bonding – Process – With shaping
Patent
1998-11-20
2000-10-24
Ryan, Patrick
Metal fusion bonding
Process
With shaping
228145, 228158, 228152, 2281731, B21D 2100
Patent
active
061353434
DESCRIPTION:
BRIEF SUMMARY
This invention concerns a method and a machine for the fabrication of a conical mantle of sheet material, in particular a frustrum of a cone intended to be press rolled further to final shape. The invention also concerns the starting blank of the cone. According to the invention made cones may with advantage be used at the fabrication of water cyclones intended for the cleaning of waste water as well as fibre suspensions in paper mills.
According to previously known technique fabrication of conical mantles made from sheet material starts with the milling of ring shaped sheet segments so that they take conical shape. Examples of this are described in the U.S. Pat. Nos. 3,016,082, 3,091,279, 3,287,953, 3,623,349, 4,195,509 and 4,735,076. At the rolling according to the known technique three or four rollers are used and the sheet blank is subjected to more forceful deformation in its more narrow, the upper end of the cone corresponding end and its rolled so that the opposing radial sides of the ring segment meet, whereafter these are joined together.
It is also known to fabricate cones by in a number of operations pressing a blank so that it finally receives a conical shap. Since however this method includes many steps it is practically impossible to guarantee an entirely round shape. At the use of cones made in this way for the fabrication of for instance cones in cyclones by subsequent press rolling a part of this unroundness will remain. In particular the unroundness that is a result of the weld often remain.
It has in reality turned out to be difficult or perhaps even impossible to secure that the cross section of the cone becomes round. Generally the radius in the area close to the edges that are to be joined become somewhat longer than intended, i.e. it is difficult to make the curving to continue all the way to the edge. Furthermore the forces necessary for the shaping closest to the edge increase to very high values. In reality thus the edges that are to be joined will remain entirely flat. This phenomenon results in turn in that a corner is accrued in the cone. If the cone is to be used at the fabrication of a cyclone, vortex cleaner or the like such a corner noticeable diminish the separating ability of the cleaner by turbulence being generated at the corner or corners. Furthermore an unround cone is worn faster in a cyclone. If one attempts to apply larger forces in order to achieve a counteracting of this tendency there is a risk that an indentation take place instead. This also result in turbulence and unsatisfactory separation and great wear. Also when a cone made in this way is machined additionally by for instance press rolling normally the tendency for unroundness remain in the final product.
The risk for unroundness in the final product is not only a result of the rolling itself but may also be result of welding. The welding heat namely result in a tendency to bend the sheet material in the edge area. Since a weld furthermore always has a tendency to shorten somewhat when it has cooled off one risks not only to obtain unroundness but also a bending of the cone in its length direction.
Of the above mentioned methods for the fabrication of cones the rolling method has the drawback that the blank will be too flat close to the joint to give a good roundness at the welding while the successive pressing in tools although giving greater possibility to counteract this, simultaneously easily result in a great number of corners for the cone corresponding to the joints between the different bending steps. The latter method also has the drawback with great tooling costs and many steps in the work. The known method result in circumstantial fabrication, large cassation risk and an expensive final product.
At the shaping the blank often passes through two or more bending or rolling phases. In the first the sheet is bent to a certain extent so that the final product from the second phase will be as close as possible to the conical shape. The cone is then removed from the bending station and transferred to a
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Thorngren Jan
Thuswaldner Herman
AB Ribea Engineering
Elve M. Alexandra
Ryan Patrick
LandOfFree
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