Abrading – Machine – Rotary tool
Reexamination Certificate
1998-12-10
2001-05-08
Ostrager, Allen (Department: 3725)
Abrading
Machine
Rotary tool
C451S178000, C451S182000, C451S194000
Reexamination Certificate
active
06227953
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an apparatus of a multiple-stage grinding machine for grinding and removing burrs in a continuous rolling process where billets are joined together by a flash butt welding method.
2. Description of the Related Art
In the continuous rolling process, the successively casting billets are joined together at the inlet of a rolling mill, making use of the flash butt welding method. And then, a contiuous billet can be formed. Finally, the continuous rolling process, what we call, Endless Rolling Process, can be obtained. However, the said process has a possibility to bring about an uplifted welded part with spills (which are caused by an untrimmed laminated part line) and other defects. As a result, the as-welded billet has been rolled without any corrective action. No satisfactory product can be produced in such a way, from a view point of the product quality. Consequently, the burr on the welded part is in need of being removed before being processed by the rolling mill.
In case of a square billet, a burr-removal apparatus has been disclosed in ‘unexamined Japanese patent publication No. 52-43754, examined Japanese patent publication No. 57-11722. ’ Such a disclosed burr-removal apparatus utilizes formed turning tools or those which face each other against its opposite side, in order to remove the said burr on the welded part. This apparatus has, however, disadvantages of suffering severe abrasion on the turning tool and of spending a lot of time on exchanging the turning tools. By that reason, this apparatus is not suitable for being applied to the continuous rolling process under the usual operating condition of 24 hours continuously.
Furthermore, a method has been known to grind burrs on the welded part by a grinding machine, syncronizing the grinding machine with the travelling billet. (See unexamined Japanese patent publication No. 9-66450, unexamined Japanese patent publication No. 9-122918). However, such a method requires that the grinding machine travel, simultaneously with the travelled billet itself, for a required time (3-10 sec. ) to be grinded. This causes some problems with respect to space-arrangement and the instrumentation control system.
But, in such a continuous rolling process for billets, the grinding method is the most suitable for removing burrs on the welded part because it meets severe operative rolling conditions. In such a case, under the condition of using the travelling grinding machine, the large space for travelling is required. In addition, a complex instrumentation control system is required for synchronizing the grinding machine with travelling speed of billet. On the other hand, the fixed grinding machine does not require a large space nor a complicated control system, but taking its grinding capacity into consideration, a single-stage grinding method cannot deal with the whole of the successively occurring welded parts.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an apparatus of a multiple-stage-grinding machine for removing burr on the welded part of the billet stepwise with small sized grinders to save space and simplify the control system.
In addition, this apparatus has a technical feature for removing burr on the flash butt welded part in the continuous rolling mill process by the multiple-stage-grinder, wherein the plural fixed grinding machines are located at the different distances between the facing each pair of grinding machines, which are gradually getting shorter along the travelling direction of a billet from upstream to downstream.
It is, also, an apparatus for removing burrs by the multiple-stage grinding machine, wherein an axes of the grinders of the above-mentioned plural fixed grinding machines are located at inclined positions against the direction of billet transferring line.
In the present invention, the plural fixed grinding machines are equipped in a manner that the distances between the each pair of grinding machines, which are facing each other between the upper side and the bottom one of a billet, and between the left side and the right one of the billet, are gradually getting shorter, along the travelling direction of a billet from upstream to downstream. So, the burr on the welded part is ground stepwise in a manner that the continuous billets are passing through each pair of grinders. Therefore, the load on each grinders can be reduced without unreasonable force to the billets. Furthermore, the small size of the grinders makes it possible to save space for the apparatus. And because there is no need for the grinding machines to travel, it is possible to control the apparatus in a simple way.
From another aspect of view, because the axes of the grinders of the plural fixed grinding machines are located at an inclined position against the transferring line, the contacting time with billet and the retreival time for billet can be kept longer. Consequently, the grinded powder from the burrs can easily be dumped, because it cannot be splashed on the billets and on the neighboring grinding machines.
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patent: 0761331 (1997-03-01), None
patent: 52-43754 (1977-04-01), None
patent: 57-11722 (1982-03-01), None
patent: 09066450A (1997-03-01), None
patent: 9-66450 (1997-03-01), None
patent: 9-122918 (1997-05-01), None
Patent Abstracts of Japan, vol. 018, No. 054 (M-1549), Jan. 27, 1994 and JP 05-277916 A (Kawasaki Steel Corp.), Oct. 26, 1993—Abstract; Figure 2.
Fujii Hiroshi
Matsuo Giichi
Okushima Koji
Frishauf, Holtz Goodman, Langer & Chick, P.C.
Hong William
NKK Corporation
Ostrager Allen
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