JP3135157B2 - Metal cutting jig for molten steel processing tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal cutting jig detachably attached to a single-hole lance used for performing a molten steel treatment such as a decarburization treatment.

[0002]

When performing BACKGROUND ART decarburization such molten steel processing, the furnace or processing chamber (hereinafter simply treatment vessel hereinafter) oxygen gas from the lance inserted from above into the molten steel in, and blowing Ar or N ₂ gas or the like leaving Methods for promoting charcoal, raising the temperature, and adjusting the components have been used. The splash of the molten steel caused by the spraying of the oxygen gas and other gases causes the metal to adhere to the inner wall of the treatment tank, which gradually grows and eventually adversely affects the molten steel treatment. For removing the adhered metal, it is effective to remove the molten metal by blowing oxygen gas, but the conventional lance for treating molten steel cannot be used as it is.
This is because the lance for molten steel processing has a narrow spray angle in order to efficiently react oxygen gas and the like with the molten steel, so that even if oxygen gas is sprayed, it does not reach the inner wall of the processing tank. Therefore, as shown in FIG.
Or a horizontal lance, and a lance has been developed for infiltrating the oxygen gas obliquely downward or horizontally and spraying it onto the inner wall of the treatment tank. It has also been used in place of.

[0003]

The gas is obliquely cut through the slab.
As described above, when using a metal lance that is spread downward and horizontally and sprayed , a separate metal lance must be prepared, and replacing the lance requires considerable time and effort. And it took time. The present invention uses a conventional single-hole lance for molten steel processing , and can be used as a lance for metal ingot cutting simply by attaching a jig to the lance , and the jig can be easily attached. is there.

[0004]

A jig for metal ingot cutting according to the present invention comprises a lower end portion of a single-hole lance used for performing molten steel processing.
Removably attached to the gas, the gas spray angle is oblique
For conventional sliver cutting, spraying downward or horizontally
A metal cutting jig that is the same or similar to a lance
The fastening means is formed symmetrically on the outer periphery of a jig portion inserted into the outlet, and the protrusion is symmetrically formed on the inner wall of the outlet of the upper blowing lance. A vertical section formed by a vertical groove and a horizontal groove connected to a lower portion of the groove is formed as an L-shaped or hook-shaped recess. According to this, the protrusion is pressed against the vertical groove of the recess, and the jig is pushed in.
Then, by rotating a predetermined amount, the convex portion is fitted into the horizontal groove and locked. That is, press the jig and rotate it,
Alternatively, by performing the reverse operation, the jig can be attached and detached.

[0005]

[Action] To perform metal cutting, pull out a single-hole lance from the lance insertion hole of the treatment tank, and push a jig into the lower end .
After turning it , reinsert it into the lance insertion hole. Then, oxygen gas is blown out from the jig. The blowing angle of oxygen gas is larger than the blowing angle of the single-hole lance of the molten steel processing tank, and it is the same or similar to that of the lance for metal slab cutting, so that oxygen gas can be blown to the inner wall of the processing tank. The metal that adheres to the inner wall is melted and cut.

[0006]

In the drawing, reference numeral 1 denotes a single-hole lance used for performing decarburization treatment in a molten steel treatment tank.
An arc-shaped convex portion 2 is protruded at a symmetrical position along the inner circumference. 3 has an anchor-shaped cross section, forms a recess 4 in the center of the upper surface, and forms an outlet hole 5 from the recess 4 in an umbrella-like shape.
This is a jig for metal ingot cutting with an opening of °.
The outer periphery of the insertion portion 3a inserted into the outlet of the
The recess 6 is formed by cutting out a circular arc-shaped vertical groove 6a into which is fitted and an arc-shaped horizontal groove 6b connected to the lower end of the groove 6a. In the figure, reference numeral 7 denotes an insertion hole into which a tool for rotating the jig 3 is inserted.

The jig according to the present invention is constructed as described above, and is attached by a tool (not shown) inserted into the insertion hole 7 at the lower end of a single lance pulled up from a lance insertion hole (not shown) of the processing tank. ), The jig 3 supported by the vertical groove 6a
Is positioned so as to fit with the convex portion 2 and pushed in. With the convex portion 2 reaching the groove bottom, the jig 3 is moved counterclockwise in FIG.
Until it reaches the groove end of the horizontal groove 6b.

When the mounting of the jig 3 is completed as described above, the lance 1 is again inserted into the lance insertion hole by a predetermined amount.
Next, oxygen gas is blown obliquely downward from each blowout hole 5 of the jig 3 at an angle of 60 ° with respect to the vertical line, and blown to the inner wall of the processing tank. This melts and cuts the metal that adheres to the inner wall. When the metal cutting is completed, the jig 3 is removed from the lance 1 through a procedure reverse to the above.

[0009]

As described above, the jig for metal ingot cutting according to the present invention is adapted to be detachably attached to a single-hole lance for treating molten steel. The lance can be used as a lance for cutting metal, so that it is not necessary to separately prepare a lance for cutting metal, and it is possible to easily switch between molten steel processing and slab cutting as compared with a conventional lance replacement method. Moreover, the attachment and detachment of the jig is simple.
Push it into the hole lance and turn it, or vice versa, pull it out
It can be done easily and securely with simple operation
You.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a metal cutting jig attached to a single-hole lance.

FIG. 2 is a plan view of the jig.

FIG. 3 is a sectional view of a main part of a conventional lance for cutting metal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Single-hole lance 2 ... Convex part 3 ... Jig for metal cutting 4 ... Recess 5 ... Blow-out hole 6 ... Recess 6a ... Vertical groove 6b ...・ Horizontal groove

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yoshinori Tsuruhara 11-1, Showa-cho, Kure-shi, Hiroshima Nisshin Steel Corporation Kure Works (72) Inventor Yasuhiro Higashijima 1-9-9 Sanno, Yawata-Higashi-ku, Kitakyushu-shi No. 10 Inside Kuzuki Kogyo Co., Ltd. (56) References JP-A 4-37245 (JP, U) JP-A 2-87054 (JP, U) JP-A 54-6308 (JP, U) −35319 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) C21C 5/46 F27D 23/02

Claims (1)

(57) [Claims] 1. A single-hole lance used for performing molten steel processing.
It is detachably attached to the lower end of the
Conventional ground where the air is blown obliquely downward or horizontally
A metal slicing jig that is the same as or similar to a slicing lance
Wherein the fastening means are formed symmetrically on the inner wall of the outlet of the upper blowing lance and symmetrically formed on the outer periphery of the jig inserted into the outlet. A jig for metal stencil cutting, wherein a vertical cross-section formed of a vertical groove into which is fitted and a horizontal groove connected to a lower part of the groove has an L-shaped or hook-shaped recess.