Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
  • B21B31/02—Rolling stand frames or housings; Roll mountings ; Roll chocks

Definitions

• the present invention relates to stands or bearing structures of rolling mills, in particular the stand shoulders of rolling mills for steel flat products such as slabs, thin slabs and strips.
• the rolling stands presently known are comprised of two shoulders of elongated annular shape, each of which is usually formed as a monolithic assembly obtained by casting, wherein two uprights and two crosspieces can be seen. Therefore a shoulder of known type is characterized by simple shapes and heavy masses, such as to reach e.g. a weight in the order of 50-100 tons.
• the solid rectangular cross section of the uprights if on one hand ensures a high vertical stiffness, i.e. a reduced elongation of the shoulder under load, and high horizontal rigidity, i.e. a small shrinking, under load, of the span between the uprights at the inside of which are slidably mounted the bearing-holder packings, on the other hand it has the drawback of requiring threaded, dead holes to be drilled for mounting all the apparatuses equipping the shoulder, in addition to involving the need of enclosing the upright with the cooling and lubrication pipes.
• the shoulder structure according to the invention can be cast in a single piece or obtained by assembling a plurality of pieces, for example being welded to each other as it appears from the following description and the claims depending on claim 1. In the former case the casting results to be more complex as regards the shape, with respect to a conventional shoulder with solid uprights, but the portions of greatest stiffness, e.g.
• Figure 1 shows a perspective view of a first embodiment of the shoulder according to the invention having the uprights wings free;
• Figures 2 and 2a shows respectively a front view and a side view of the same shoulder of figure 1, with said wings being connected through a web in the central portion;
• Figure 3 shows a perspective view of a further embodiment of the shoulder according to the invention.
• the structure of uprights 3, comprises for each upright an inner wing 3A and an outer wing 3B which in the embodiment of Figures 2 and 2a are connected to each other in the central portion only through to a web 3C, whereas in the embodiment of Figure 1 and 3 they are independent from each other.
• the web 3C there could be provided stiffening cross brackets (not shown) for joining both wings of the upright.
• the crosspieces 2 comprise an inner web 2A and an outer web 2B with a reinforcement 2D in correspondence with the vertical symmetry axis. Such a reinforcement has the function of distributing the forces exerted onto the zone of the inner wing 2A and deriving from the action of the mechanical or hydraulic means intermediate between the bearing-holders packings (not shown) and the shoulder itself.
• the action of the separating force Fs acting onto 2A leads to a situation of tension in the wings of both uprights, which is due both to a pull along a single axis and to the fixing moment between uprights and cross piece.
• the inner upright 3A will have preferably a cross-section area larger than that of upright 3B.
• the horizontal shift or bending of wing 3A towards its corresponding one at the opposite side of the shoulder is lower than the shift of the outer wing 3B to the same direction.
• the shoulder according to the invention allows to operate with lower plays between bearing-holder packings and guides 5, with a multiplicity of operational advantages such as the reduction of possible instability phenomena in the bearing packings, or by keeping under control the conditions of the packings themselves sliding under load along the guides 5.
• the shoulder can be made as a monolithic casting, so as to provide in any case advantages with respect to the conventional solid structure.
• the thickness will be substantially reduced except for the possible reinforcement area 2D, which however dan be formed as in the solution of figure 3, that it is with opening, thereby still lightened.
• the wings 3A, 3B are fully accessible in the areas 6A, 6B, both in the embodiment of figures 2, 2a with the web 3C, due to the presence of openings 7 in the connecting areas with the crosspieces 2, and even more in the embodiments of figures 1 , 3 where there is provided no intermediate web.
• the wings 3A, 3B have preferably a thickness lower than 400 mm and are accessible from both sides, the welding can be carried out with a depth of less than 200 mm from the surface, with clear advantages, already pointed out with respect to a possible welding between solid elements or a solid one and a box-shaped closed element.
• the wings of the uprights are preferably formed of rolled sheets or plates, which can be easily supplied and are possibly available in stock for being cut at a given size even after the crosspieces are made ready.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Metal Rolling (AREA)
• Rod-Shaped Construction Members (AREA)
• Buildings Adapted To Withstand Abnormal External Influences (AREA)
• Pressure Welding/Diffusion-Bonding (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=11370691

Family Applications (1)

Country Status (6)

Cited By (2)

Citations (8)

• 1995
  • 1995-02-24 IT ITMI950362A patent/IT1273967B/it active IP Right Grant
• 1996
  • 1996-02-22 JP JP8525540A patent/JPH11500664A/ja active Pending
  • 1996-02-22 EP EP96904255A patent/EP0873204A1/en not_active Withdrawn
  • 1996-02-22 KR KR1019970705825A patent/KR19980702426A/ko not_active Application Discontinuation
  • 1996-02-22 WO PCT/IT1996/000033 patent/WO1996026022A1/en not_active Application Discontinuation
  • 1996-02-22 CN CN96192132A patent/CN1176611A/zh active Pending

Patent Citations (8)

Non-Patent Citations (1)

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