Metallurgical apparatus – Means treating a continuum of work – With heating means
Patent
1982-07-06
1983-11-15
Rutledge, L. Dewayne
Metallurgical apparatus
Means treating a continuum of work
With heating means
266131, 266133, 148143, 148153, 134122R, C21D 164
Patent
active
044151438
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a continuous hardening device of steel plate wherein the steel plate is passed through a cooling vessel filled with cooling water circulated therein for hardening the steel plate continuously.
BACKGROUND OF THE INVENTION
It is essential to increase a relative speed between the steel plate and the cooling water for increasing the cooling speed of the same plate and thereby improving the efficiency of the hardening operation. In a known cooling procedure, such a feature has been realized by injecting a pressurized cooling water onto the surface of the steel plate through a plurality of nozzles.
However, such a cooling procedure inevitably requires a large and heavy installation for the pressurized cooling water and a large quantity of the cooling water requiring a high installation and operational cost. Furthermore, it requires water supplying and exhausting pipe lines of a large diameter, necessitating a large installation space and increasing the height and length of the hardening device. In addition, the large and thereby heavy pipe lines and heavy contents therein require an additional reinforcement of the supporting members such as supporting frame and the like, while the pipe line of a large size increases the pitch between pipe lines provided in parallel, thus making it difficult to increase the density of injected cooling water and to maintain a required capability of cooling the steel plate. Furthermore, a problem such as clogging of nozzles tends to result in uneven hardening of the steel plate, and increases the time and labor required for eliminating the clogging of the nozzles.
A cooling device for steel plate has been disclosed in Japanese Patent Publication No. 11247/1978. In this device, there are provided a number of roller pairs supporting the steel plate on the upper and lower sides of the steel plate and a plurality of upper and lower enclosures arranged symmetrically for encasing a pair of the rollers and a part of the steel plate adjacent to the pair of rollers between the upper and lower enclosures. The widthwise and lengthwise ends of the enclosures are closed. Cooling water supply tubes and cooling water exhaust tubes are connected alternately to the enclosures. Narrow spaces provided between the enclosure and the steel plate provide passages of the cooling water along which the heat of the steel plate is dissipated. In this cooling device, however, since the rollers and the steel plate are encased in each enclosure with narrow spaces formed between the enclosure and the steel plate being utilized for passages of the cooling water, a probability of the passages being clogged still exists. When the clogging of the passages occurs, the cooling effect of the cooling device is thereby substantially reduced.
It is an object of the present invention to provide a continuous hardening device of steel plate wherein the above described difficulties of the conventional devices are substantially eliminated, and a desired cooling capability can be maintained regardless of its small-size construction and a reduced consumption of cooling water.
DISCLOSURE OF THE INVENTION
According to the present invention, the above described objects can be achieved by passing the steel plate through a cooling water vessel wherein cooling water is continuously supplied and exhausted for maintaining a circulation of the same, and paddle wheels are provided adjacent to the upper and lower surfaces of the steel plate. The rotation of the paddle wheels accelerates the circulation of the cooling water and forces the same to flow in the feeding direction of the steel plate or in the reverse direction at a predetermined relative speed between the cooling water and the steel plate. By the above described construction of the hardening device, aforementioned clogging of nozzles or blocking of passages in the prior art can be substantially eliminated, and hardening of the steel plate can be carried out efficiently. Consequently, consumption of cooling water can be reduced, and
REFERENCES:
patent: 1350618 (1920-08-01), Napier
patent: 3358980 (1967-12-01), Taylor
patent: 3423254 (1969-01-01), Sufford et al.
patent: 3546911 (1970-12-01), Lenz
patent: 4039349 (1977-08-01), Kwasnoski et al.
Kawasaki Steel Corporation
McDowell Robert
Rutledge L. Dewayne
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