Rolling mill plant for the manufacture of seamless tubes

Details Rolling mill plant for the manufacture of seamless tubes Rolling mill plant for the manufacture of seamless tubes

1984-11-16

1986-02-25

Larson, Lowell A.

Metal deforming

By use of tool acting during relative rotation between tool...

With metal deformation of different type

72 97, 72 96, 72209, B21B 1500, B21B 1906, B21C 4500

Patent

active

045719705

ABSTRACT:
In a rolling mill plant for the manufacture of seamless tubes, a piercing mill (2), a planetary skew rolling mill (15) and a sizing or stretch-reducing rolling mill (18) are arranged one after the other. In order to improve the output and the quality of the products of plant of this kind, it is proposed not to withdraw the shaft rods (11) used during the piercing operation in the mill (2), but also to use them as internal tools in the planetary skew rolling mill (15). The shaft rods can then remain at the entry end upstream of the planetary skew rolling mill (15) from where they can be returned to the piercing mill (2). Alternatively (FIGS. 2 and 4) they can also pass through the planetary skew rolling mill and be returned from the delivery end thereof to the piercing mill. The insertion, hitherto required, of rods into the hollow ingots before entering the planetary skew rolling mill is not required. The heavy scaling of the surface of the bore in the hollow ingot thereby occurring is avoided.

REFERENCES:
patent: 1867120 (1932-07-01), Vollmer
patent: 1936790 (1933-11-01), Heetkamp
patent: 2010400 (1935-08-01), Klein
patent: 2024514 (1935-12-01), Diescher
patent: 3857267 (1974-12-01), Lemaire et al.
patent: 4037449 (1977-07-01), Schuetz
patent: 4212178 (1980-07-01), Bretschneider
patent: 4311032 (1982-01-01), Nessi
patent: 4318294 (1982-03-01), Yoshiware et al.

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