UA77991C2 - Laying of rolling mill with segmented annular guide - Google Patents

Abstract

A laying head has a quill (12) rotatable about an axis (x) and a pipe (14) carried on the quill (14). The pipe (14) has an entry end (14a) arranged toreceive a product, and an intermediate portion (14b) defining a curved guide path leading from the entry (14a) and to a delivery end (14c) spaced radially from the quill axis (x) and from which the product is discharged as a helical series of rings. A guide defines a helical extension of the guide path and comprises a helical support plate (22) projecting outwardly from the quill (12). A plurality of channel-shaped guide sections (20) are supported end to end on the support plate (22). The guide sections (20) form a segmented radially outwardly facing helical trough (16) surrounded by a cylindrical shroud (18) that cooperates with the guide sections (20) to define radially and axially confined helical extension of the guide path.

Description

Description of the invention

This application claims priority to prior US Patent Application Serial No. 60/340,180, filed Dec. 14, 2001, and US Utility Model Patent Application Serial No. 10/313,938, filed Dec. 6, 2002.

This invention relates to high-speed rod rolling mills and relates, in particular, to improvements in the stacking heads used in such mills to convert the hot-rolled product into a series of rings.

Referring to Fig. 1, it can be seen that a typical stacking head has in its composition a casing 10 containing a 70 rotationally controlled hollow shaft 12. A three-dimensionally curved stacking pipe 14 is installed on the shaft 12.

The stacking pipe has an inlet end 14a located along the axis of rotation X of the shaft, and a curved intermediate section 14p that leads to an outlet end 14c located radially from the X axis.

The hot-rolled steel rod is fed to the inlet end 14a of the outlet pipe along the X-axis, and it exits the outlet end 14c in the form of spiral ring moldings. 12 When leaving the outlet end 14c of the stacking pipe, the rings are additionally limited and move forward with the help of a spiral chute 16 surrounded by a cylindrical protective cover 18.

The guide chute 16 has such a configuration and dimensions that it can interact with the casing 18 in providing axially and radially limited spiral advancement of the guide path defined by the stacking pipe.

Although this advance restriction is very useful in ensuring that the tail ends of products passing through the stacking head are not skewed and looped, the single instructions for the guide chute add some difficulty. For example, materials that can be easily formed or machined into a helical configuration are relatively soft and thus experience accelerated wear caused by frictional contact with the hot-rolled product. Although accelerated frictional wear occurs only locally along short portions of the path of the guide device, the chute must be replaced in its entirety when the exposed section c is no longer serviceable. Thus, since the dimensions of the guide chute are chosen to closely Ge) limit the size of the particular product, a change in the rolling program for a different size product may normally require replacing the fully guide chute with another chute that has the correct dimensions to handle the new product.

According to this invention, the known unitary guide channel (wiring) is replaced by a set of guide sections in the form of channels placed on the periphery of the spiral support plate. The guide sections are preferably od) identical, placed separately from each other and attached to the base plate so that they can be removed. With this arrangement, the support plate can be made of one material selected for its strength and formability, for example, AZTM OR2, and the guide sections can be cast or machined from another material selected for its resistance to frictional wear, for example, ABZTM d140. Guide sections that have experienced accelerated wear can be replaced, while others remain in place for long, extended use. Product resizing can be easily accommodated by simply replacing only the guide sections without the need to replace the spiral base plate as well.

These and other characteristic features and advantages of the present invention will now be described in more detail with reference to the accompanying drawings in which:

Fig. 1 is a partially sectional side view of a typical stacking head; - c Fig. 2 is a perspective view of the shaft of the laying head and the laying pipe equipped with a spiral support

I" plate, and a segmented guide chute in accordance with the best embodiment of this invention;

Fig. 3 is a perspective view of the segmented guide chute and the spiral base plate;

Fig. 4 is an exploded perspective view of the components shown in Fig. 3;

Fig. 5 is a perspective view of the spiral base plate; and that. Fig. 6 is the final view of one of the segments of the chute. -I With additional reference to Fig. 2, it can be seen that the spiral gutter (wiring) 16' in accordance with the present invention is formed by guide segments 20 in the form of channels, attached end to end to a spiral support plate 22, which has a sleeve 24 attached to the end of shaft 12 so that it can be removed. (Te) 20 Figure 3 shows the assembly of the spiral support plate 22 and the guide segments 20 removed from the shaft, Figure 4 is an exploded view of the assembly details, Figure 5 shows the spiral support plate 22 itself, and Figure b6 shows an end view of a typical guide segment . The individual guide segments 20 typically have O-shaped guide channels with mounting flanges 26. The mounting flanges 26 are angled relative to their respective guide channels and are preferably provided with laterally projecting projections 28 configured and sized to be seated in local grooves ZO in the flat turned surfaces of the assembly 31, placed around the side

GF) of the spiral support plate 22. The guide segments are centrally attached by bolts 32 or the like so that they can be removed, and are preferably spaced apart as shown in Figs. 2 and 3 at 34 to accommodate o thermal expansion.

The guide segments 20 may contain dimensionally accurate insert castings cast from lightweight materials 60 such as titanium. The guide segments can also be provided with wear-resistant and heat-resistant ceramic liners.

If individual guide segments show accelerated wear, they can be replaced without replacing those that show less wear. Thus, if products of different sizes are to be rolled, only the guide segments need to be replaced. b5

Claims (10)

The formula of the invention 1. The stacking head of a rolling mill for forming a longitudinal product moving along an axis into 2 rings forming a spiral, the stacking head having a hollow shaft which is rotatably mounted about an axis, and a pipe mounted on the shaft, and the pipe has an inlet an end placed along the axis and installed with the possibility of receiving the product, and an intermediate part that defines a curved guide path leading from the input to the output end, separated radially from the axis, from which the product is discharged in the form of rings forming a spiral, a guide device, which defines a spiral extension of the guide path 70, and the guide device includes: a spiral support plate that protrudes outward from the hollow shaft; a plurality of guide sections in the form of channels, fixed end to end on the base plate, and the guide sections form a segmented radially outward spiral groove; and a cylindrical casing that surrounds and interacts with the guide sections defining a radially and axially limited helical extension of the guide path. 2. The laying head of the rolling mill according to claim 1, which is characterized by the fact that the guide sections are attached to the spiral base plate with the possibility of their removal. 3. The laying head of the rolling mill according to claim 1, which is characterized by the fact that the guide sections are separated from each other along the periphery of the base plate. 4. The laying head of a rolling mill according to claim C, characterized in that the guide sections are provided with flanges extending radially inward along the side of the base plate, and said flanges are attached centrally to the side. 5. The laying head of the rolling mill according to claim 4, which differs in that the side has flat support surfaces against which the flanges are fixed. with 6. The laying head of the rolling mill according to claim 5, which is characterized by the fact that the flanges are provided with protrusions protruding from (3 sides), which are fixed in the grooves of flat surfaces. 7. The stacking head of the rolling mill according to claim 1, which is characterized by the fact that the guide segments are identical and interchangeable with each other. 8. The laying head of the rolling mill according to claim 1, which is characterized by the fact that the guide segments are formed from -- a material that has a higher resistance to frictional wear compared to the resistance to frictional wear of Ge»! base plate material. 9. The laying head of the rolling mill according to claim 1, which is characterized by the fact that the support plate is attached to the shaft o with the possibility of its removal. Cha 10. The laying head of the rolling mill according to claim 4, which is characterized by the fact that the flanges have an angular displacement of 325 relative to the corresponding guide sections. - - i» -i -i se) se) - ime) 60 b5