Metal treatment – Compositions – Heat treating
Patent
1980-04-10
1982-06-29
Stallard, W.
Metal treatment
Compositions
Heat treating
266 51, 266 74, 266 75, B23K 708
Patent
active
043370993
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
Techincal Field
The present invention relates to a method and apparatus for conditioning of surface flaws of a red-hot steel material.
Background and Prior Art
In conditioning of surface flaws of a red-hot steel material such, for example, as a slab, a sheet or bar or the like, immediately after being delivered from a hot rolling mill, it is required to detect the position and size of each flaw, to properly mark the detected flaw before forwarding the material to the subsequent conditioning step, and to quickly and properly treat the marked flaw.
Many apparatuses such as an optical flaw detector, an ultrasonic flaw detector, an eddy current flaw detector and the like are used in practice for detecting surface flaws of a hot steel material such as a slab. In each of these apparatuses, it is necessary to accurately mark the detected flaws in order to properly remove the flaws in the subsequent step. The most suitable method for removing surface flaws of the hot steel material is scarfing. In order to carry out quickly a scarfing operation on a transfer line, it is necessary to form a molten pool instantaneously on the surface of the steel material.
In the case of surface flaw inspection of a cold steel material, many marking methods using things such as paint, powder, a label, grinding and the like can be applied and many apparatuses therefore have been devised. On the other hand, a marking method applicable to surface flaws of a red-hot steel material is to mark it with a special paint. However, the red-hot steel material is liable to form scales on the surface which are readily flaked during transfer. Accordingly, this marking method has a disadvantage that the makring may be made indistinct by flaking off of the scales after transfer.
Disclosure of Invention
The present invention is directed to a method and apparatus for marking the accurate position of a flaw by driving a nail of steel into it in response to a detection signal of a flaw detector for detecting surface flaws in a red-hot steel material, and for quickly conditioning the marked flaw by scarfing. In order to quickly condition the flaw in the red-hot steel material on a transfer line, it is necessary to produce a molten pool instantaneously on the surface of the steel material. According to the present invention, since the steel nail driven into the red-hot steel material is heated by the heat of the steel material and has its head protruding from the surface of the steel material, the required molten pool can be instantaneously produced by melting the nail upon conditioning the flaw by scarfing.
BRIEF DESCRIPTION OF DRAWINGS
The invention will be better understood from the following description taken in connection with the accompanying drawings in which:
FIG. 1 is a schematic block diagram of an apparatus for practising the method according to the present invention;
FIG. 2A and 2B are perspective views of different types of a marking nail for use in the method and apparatus according to the present invention;
FIG. 3 is a perspective veiw of a cartridge holding the nails;
FIG. 4A is an illustration of the condition of the nail immediately after the beginning of the scarfing operaton;
FIG. 4B is an illustration of a molten pool produced by melting the nail; and
FIG. 5 is a side view of an embodiment of the marking unit according to the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
Referring now to the drawings, particularly to FIG. 1, reference numeral 1 denotes a red-hot steel material, 2 denotes a flaw detecting unit, 3 denotes a detector head, 4 denotes a nail marking unit, 5 denotes a scarfing control unit, 6 denotes a scarfing unit, 7 denotes a scarfing torch, and 8 denotes a nail of steel for marking a flaw. These units are incorporated into an apparatus for carrying out the method according to the present invention, which is disposed, above a transfer line for the red-hot steel material 1 and immovable in the transfer direction thereof.
In flaw detection of the red-hot steel material 1 on the tra
REFERENCES:
patent: 3508323 (1970-04-01), Richards
patent: 3615898 (1971-10-01), Coffman
Hiroshima Tatsuo
Sakamoto Takahide
Stallard W.
Sumitomo Metal Industries Ltd.
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