Metal deforming – By use of roller or roller-like tool-element – Plural roller-couples
Patent
1993-06-29
1995-08-22
Larson, Lowell A.
Metal deforming
By use of roller or roller-like tool-element
Plural roller-couples
72250, B21B 3916
Patent
active
054429463
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a sizing treatment for sizing an outer peripheral of a steel stock comprising general-purpose steel, stainless steel, special-purpose steel, or the like, and having a round shape, a hexagonal shape, or the like in a transverse cross section, sizing treatment which is adapted for upgrading the dimensional accuracy, the roundness, or the like of the steel stock. In particular, the present invention relates to a steel stock shaping apparatus and a steel stock shaping process which are appropriate for precision rolling, ultra precision rolling, or the like.
BACKGROUND ART
In industries, it is getting required to further upgrade the dimensional accuracy, the roundness, or the like of bar stocks, wire stocks, or the like, having circle shapes in their transverse cross sections. For example, in the case of a steel stock having a diameter of about 50 mm, it is required that the steel stock has a dimensional tolerance value, a value of the difference between the maximum diameter and the minimum diameter in the same cross section, or the like, in a range of plus/minus 0.70 to 0.80 mm in the conventional Japanese Industrial Standard (hereinafter simply referred to as "JIS"). However, it has been required recently that the steel stock has the dimensional tolerance value, the value of the difference, or the like, falling in the the higher accuracy, e.g., in a range of plus/minus 0.10 to 0.20 mm.
Accordingly, instead of the conventionally employed HV (i.e., horizontal and vertical) type roll apparatus for rolling in which two rolls are disposed vertically, the present applicant introduced an apparatus which is adapted for precision rolling or ultra precision rolling steel stocks into its manufacturing line. The precision or ultra precision rolling apparatus comprises a plural set of 3-roll apparatuses which are disposed in series in a steel stock transferring direction and which include 3 rolling rolls. The 3 rolling rolls have a caliber groove surface going therearound in a ring shape, and they are disposed at equal intervals in a circumferential direction of a steel stock. With this apparatus, it is possible to make the dimensional accuracy, the roundness, or the like, of the steel stock further accurate.
In this apparatus adapted for precisely or ultra-precisely rolling the steel stock, there is installed a sizing apparatus which is adapted for shaping at the final process of the rolling process. The sizing apparatus also comprises a plural set of 3-roll apparatuses which include 3 sizing rolls. Likewise, the 3 sizing rolls have a caliber groove surface going therearound in a ring shape, and they are disposed at equal intervals in the circumferential direction of the steel stock. Likewise, in the sizing apparatus, it is needed to dispose a plural set of the 3-roll apparatuses in series in the steel stock transferring direction. Moreover, on an outlet side of the sizing apparatus, it is necessary to install a guide apparatus having a guide bore in order to guide the steel stock, which has been subjected to the sizing and which has been discharged from the outlet side of the sizing apparatus, to a subsequent process.
In the sizing apparatus which is employed in the final process of the precision or the ultra precision rolling apparatus, the depressing rate reduction is extremely small during the sizing. Consequently, there is provided an advantage that the steel stock sized with the sizing apparatus comes to exhibit the dimensional accuracy, the roundness, or the like in high precision. However, there arises a problem that the leading end of the thusly sized steel stock is likely to bend in a letter "S" shape, usually in a letter "S" shape which is bent 3-dimensionally. When the depressing rate is increased during the sizing with the 3-roll apparatuses, the steel stock comes to be depressed heavily by heavily bringing all of the caliber groove surfaces of the 3 sizing rolls constituting the 3-apparatuses into contact with the outer peripheral surface of the steel sto
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Teraoka Tadanori
Yokoo Yoshiki
Aichi Steel Works Ltd.
Larson Lowell A.
Schoeffler Thomas C.
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