Gear cutting – milling – or planing – Milling – Process
Patent
1997-03-21
1999-09-14
Briggs, William
Gear cutting, milling, or planing
Milling
Process
409139, 451 6, B23C 314, B24B 4900
Patent
active
059512202
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method and apparatus for surface cutting of hot-rolled steel products, especially wide hot-rolled long sheets, and a method and apparatus for surface cutting which are advantageous in removing raised portions (projections) and burrs produced in a joint region by butt joint of semifinished steel products such as sheet bars, slabs, billets, and blooms.
BACKGROUND ART
Regarding the technologies for making a repair of flaws produced on the surface of hot-rolled steel products such as sheet bars during the hot rolling process and for removing projections inevitably produced in the joint portion in the continuous hot rolling process in which rolling is carried out by butt joining the tail edge of preceding steel product to the leading edge of following steel product, many proposals have already been made in Unexamined Japanese Patent Publication No. 57-137008, Unexamined Japanese Patent Publication No. 63-160707, Unexamined Japanese Patent Publication No. 5-23706, Unexamined Japanese Patent Publication No. 5-104261, Unexamined Japanese Patent Publication No. 57-91856, Unexamined Japanese Patent Publication No. 53-112593, and so forth.
However, these technologies have disadvantages that there arises a trouble of breaking of a hot-rolled steel product (hereinafter referred simply as to a steel product) in surface- cutting the steel product, and that the improvement in cutting efficiency cannot be achieved because the life of cutting edge is short and quick action cannot be taken when local wear of cutting edge occurs. Also, there remain problems in that it is difficult to adjust a predetermined allowance in cutting a steel product, that the equipment is damaged by the contact of cutting edges which cut a steel product from upside and downside, that chips produced by cutting cannot be disposed well, and that fluttering of steel product occurs during the cutting process.
An object of the present invention is to provide a method and apparatus which can solve all above-described conventional problems occurring in surface cutting of steel products.
SUMMARY OF THE INVENTION
The present invention provides a surface cutting method for steel products in which in cutting the top and bottom surfaces of a steel product by the rotation of milling cutters holding the steel product therebetween in the thickness direction in the conveying process of the steel product having a joint portion, the cutting resistance is determined by the cutting conditions including the type of steel product, the temperature in cutting, and the cut depth is controlled by the adjustment of cut depth, and cutting is performed by making the tension produced on the steel product by the cutting resistance lower than the breaking strength of the joint portion to prevent the breakage of steel product.
2) In the above item 1), a sudden temperature rise of steel product is detected on the input side of milling cutter, the steel product is held between the milling cutter based on the detected signal, and the surfaces of the joint portion including the nearby portion of steel product are cut.
In the above, when the steel product running direction and the milling cutter rotating direction on the cut surface are reverse to each other, the adjustment of one-side cut depth t satisfies the following equation (1). /V.sub.c +2.sigma..sub.b |(b-2w)} (1) temperature (kgf/mm.sup.2) of steel product (mm)
In the above, when the steel product running direction and the milling cutter rotating direction on the cut surface are equal to each other, the adjustment of one-side cut depth t satisfies the following equation (2). /V.sub.c } (2) temperature (kgf/mm.sup.2) of steel product (mm)
In the above, at least the cutting edges of a milling cutter are made of a ferrous material, and cooling water is sprayed to the cutting face or flank of the milling cutter at a pressure according to the rotating speed and outside diameter.
Also, the present invention provides a surface cutting apparatus for steel products comprising a pa
REFERENCES:
patent: 3676959 (1972-07-01), Forster
patent: 3822632 (1974-07-01), Chigotti
patent: 4119015 (1978-10-01), Tuda et al.
patent: 4197043 (1980-04-01), Houghton
patent: 4633620 (1987-01-01), Lorenzi et al.
patent: 5709585 (1998-01-01), Matsuo et al.
Amagasa Toshiaki
Hayashi Kanji
Ichikizaki Tetsuo
Katsura Shigefumi
Shimizu Masuto
Briggs William
Kawasaki Steel Corporation
Mitsubishi Jukogyo Kabushiki Kaisha
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