Apparatus And Method For Reducing The Section And Sizing Of Rolling Mill Products For Wire Rod

• US 20080110228A1
• Filed: 07/18/2005
• Published: 05/15/2008
• Est. Priority Date: 10/06/2004
• Status: Active Grant

• Current Assignee: Siemens Magnet Technology Limited (Siemens AG)
• Original Assignee: Siemens Magnet Technology Limited (Siemens AG)
• Inventors: Ferrario, Giuseppe
• Granted Patent: US 8,113,026 B2
• Time in Patent Office: Days
• US Class Current: 72/366.2
• CPC Class Codes: B21B 1/18 in a continuous process

Abstract

An apparatus for reducing the section and sizing of rolling mill products for wire rod comprises a first finishing monoblock (10) made up of a plurality of rolling stands (G1-Gn) arranged in sequence suitable for forming a rolling line and a second monoblock (20) suitable for giving the product a round section with narrow tolerances. According to the invention, said second monoblock (20) comprises a sequence of stands (S1-S4) of the type with grooves configured so as to give a round-oval-round-round section to the product.

Claims

1. Apparatus for reducing the section and sizing of rolling mill products for wire rod of the type comprising a first finishing monoblock (10) made up of a plurality of rolling stands (G1-Gn) arranged in sequence suitable for forming a rolling line and a second monoblock (20) suitable for giving the product a round section with narrow tolerances, characterised in that said second monoblock (20) comprises a sequence of stands (S1-S4) of the type with grooves configured so as to give a round-oval-round-round section to the product.

2. Apparatus according to claim 1, characterised in that said second monoblock (20) is arranged a suitable distance from said first monoblock (10) so as to allow the rolling of the product in the second monoblock at a predetermined temperature.

3. Apparatus according to claim 1, characterised in that said second monoblock (20) has at least one first stand (S1) equipped with suitable rolling guide, with a round groove such as to generate a round stock with negligible variations in section along the entire rod.

4. Apparatus according to claim 3, characterised in that said at least one stand (S1) at the start of the second monoblock (20) has a round groove with suitable evasions to make it easier to bite the round stock with increased size at the end caused by the pulling of the rolled material inside the first monoblock (10).

5. Apparatus according to claim 3, characterised in that said second monoblock has a second subsequent stand (S2) with oval groove such as to generate an oval with variations in width and constant thickness along the entire rod.

6. Apparatus according to claim 5, characterised in that said second monoblock (20) has a third subsequent stand (S3) with round groove such as to generate a finished round stock on the height of the profile.

7. Apparatus according to claim 6, characterised in that said second monoblock (20) has a fourth subsequent stand (S4) having rolling rolls (R4) rotated by 90°

with respect to the corresponding rolling rolls (R3) of the third stand (S3).

8. Apparatus according to claim 6, characterised in that said fourth stand (S4) is foreseen to eliminate the variation in width of the round stock coming out from the third stand and to thus obtain a product with narrow tolerances along the entire rod.

9. Method for reducing the section and sizing of rolling mill products for wire rod, characterised in that it comprises the following steps:

a) feeding the product to be rolled to a first finishing monoblock (10) comprising a number of rolling stands (G1-Gn) selected according to the rolled diameter and having a number of last stands (Gm-Gn) with grooves with large evasions to minimise the risks of overfill beyond the edge of the initial and end part of the rolled round stock from each billet and to make the distribution of the spread more uniform;

b) feeding the product coming out from the first monoblock (10) to a second monoblock (20), arranged a suitable distance (d) from said first monoblock (10) so as to allow the rolling of the product in the second monoblock at a predetermined temperature, feeding said product into a sequence of round-oval-round-round stands, foreseen in said second monoblock (20).

10. Method for reducing the section and sizing of rolling mill products for wire rod according to claim 9, characterised in that it foresees a step of feeding the product to a first stand (S1) equipped with special rolling guide with round groove with suitable evasions so as to eliminate variations in section in arrival.

11. Method for reducing the section and sizing of rolling mill products for wire rod according to claim 10, characterised in that it foresees a step of feeding the product to a second subsequent stand (S2) with oval groove such as to generate an oval, of constant width and thickness along the entire rod.

12. Method for reducing the section and sizing of rolling mill products for wire rod according to claim 11, characterised in that it foresees a step of feeding the product to a third subsequent stand (S3) with round groove that produces a finished round stock on the height of the profile.

13. Method for reducing the section and sizing of rolling mill products for wire rod according to claim 12, characterised in that it foresees a step of feeding the product to a fourth stand (S4) following the third stand (S3) and having rolling rolls (R4) rotated by 90°

with respect to the corresponding rolling rolls (R3) of the third stand (S3) to take care of eliminating the variation in width of the round stock coming out from the previous third stand (S3) and to thus obtain a product with narrow tolerances.