Metal deforming – With means to actuate both elements of tool-couple
Patent
1992-10-26
1994-02-01
Bradley, Paula A.
Metal deforming
With means to actuate both elements of tool-couple
72452, 7245301, 164476, B21J 102, B21J 912, B21J 918
Patent
active
052823741
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a continuous forging apparatus suitable for forging a cast strand produced by continuous casting in its solidifying completion region during the process of drawing the cast strand from continuous cast molds.
BACKGROUND ART
A continuous forging apparatus for forging a cast strand produced by continuous casting in its final solidification region during the process of drawing the cast strand from casting molds has been known, for example, as disclosed in Japanese Patent Application Laid-open No. 2-70,363. With such an apparatus, it is possible to mitigate center segregations and porous shrinkage cavities in cast strands, thereby advantageously improving the internal quality of products. However, the apparatus itself includes the following disadvantages and problems to be resolved. reduction amounts on both sides by means of forging anvils because of warping of the cast strand to deviate from its transfer line. Such a warp of the cast strand is caused by uneven cooling in a secondary cooling zone for cooling the cast strand, wrong correction at junctions between strands of different steel kinds or at pinch roll arranged zones or the like. external force rather than a working force for a cast strand. Therefore, the apparatus has a risk of being damaged to shorten its service life considerably.
(3) With an apparatus having hydraulic cylinders arranged for the purpose of preventing overload and adjusting the distance between anvils, in the case that the inner pressure in cylinders is different as high as 200 kg/cm.sup.2 depending on when forging is being effected or before the forging, volume of an hydraulic oil may change of the order of about 1% by compression. Even the anvils start to move away from each other from their positions nearest to each other, the reduction force remains corresponding to the compression of the hydraulic oil. Such a reduction force acts as a torque rotating the crankshaft in the reverse direction (simply referred to hereinafter "negative torque"). As there are clearances (backlashes) between tooth surfaces of gears in mesh with each other in a speed reduction device connected to the crankshaft, the torque rotating the crankshaft in the reverse direction causes the tooth surfaces of the gears to collide with each other so that strange sound (striking sound) and vibration occur which detrimentally affect the service life of the apparatus itself and make difficult the stable working of strands by the apparatus.
In order to solve the problems (1) and (2) as described above, the position control can be performed, for example, by the use of the hydraulic servo valve and the hydraulic control mechanism disclosed in Japanese Patent Application Laid-open No. 60-82,222. However, this system is expensive to increase the installation cost unavoidably. Moreover, hydraulic oil for controlling the apparatus must be kept in a highly clean state which requires a troublesome maintenance. Therefore, the system for hydraulically controlling the apparatus must be separated from general hydraulic systems. Such an arrangement is not suitable for practical use. There has been no means to overcome the problem (3).
It is an object of the invention to provide a forging apparatus for forging a cast strand produced by continuous casting during the process of drawing the cast strand from continuous casting molds, which is able to work the cast strand with uniform forging reduction amounts on both sides by causing anvils to follow the cast strand even if the cast strand is warped or floated and is also able to considerably mitigate strange sound and vibration of the installation occurring in the forging.
DISCLOSURE OF INVENTION
The present invention relates to a cast strand continuous forging apparatus including a pair of anvils for continuously forging a cast strand drawn from continuous casting molds in its final solidifying zone by repeated reciprocative movements of the anvils toward and away from each other on both sides of the cast strand, wherein the ap
REFERENCES:
patent: 3857272 (1974-12-01), Voitsekhovsky
patent: 4578983 (1986-04-01), Kimura
patent: 5168739 (1992-12-01), Heitze
patent: 5195351 (1993-03-01), Heitze
Fujimura Toshio
Inoue Noriaki
Kojima Shinji
Kushida Kouichi
Matsukawa Toshitane
Bradley Paula A.
Kawasaki Steel Corporation
Miller Austin R.
Puknys Erik R.
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