JP4774926B2 - Outer chamfer bit - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spout surface shaving bit attached to a leveling device used for smoothing a spout surface before pouring mud into an open spout.

When the hot metal is discharged from the blast furnace (so-called brewing), the filling material (a kind of refractory called mud) inside the brewing port is removed using an opening machine, and the brewing port is opened. After the completion of the tapping, the mud is again injected into the tapping opening using a mud gun to close the tapping opening.
FIG. 5 is a cross-sectional view showing the arrangement of tap holes and mud guns when mud is injected. The spout 10 is a cavity formed by the spout brick 11 and has a recess for inserting the tip of the mud gun 13 on the iron skin 14 side. FIG. 5 shows a state in which the tip of the mud gun 13 is inserted into the recess. In this way, the mud is injected from the mud gun 13 to the spout 10. At this time, if a gap is formed between the spout brick 11 that forms the recess and the tip surface of the mud gun 13, the mud will not be injected into the spout 10 and will flow out of the spout 10. In other words, it is necessary to bring the tap brick 11 that forms the recess into close contact with the tip surface of the mud gun 13.

  Since the tip surface of the mud gun 13 is machined, it is easy to finish the flat surface. However, the bottom surface 9 of the recess formed in the spout brick 11 (that is, the surface in contact with the tip surface of the mud gun 13) is damaged by opening work using an opening machine, or melted by the spout, etc. It becomes an intense side. Therefore, prior to injecting the mud, it is necessary to smooth the bottom surface 9 (hereinafter referred to as the spout opening surface) of the recess formed in the spout opening brick 11.

Various techniques for smoothing the tap surface 9 have been studied.
For example, Patent Document 1 discloses a technique for smoothing the surface of the tap mouth by attaching a dedicated jig to the tip of the mud gun and moving the mud gun forward and backward while being pressed against the tap mouth surface. Yes. Since the jig used in the invention disclosed in Patent Document 1 has a complicated structure, a smooth operation cannot be expected in an environment where a large amount of dust is generated and the temperature is high, such as around the taphole. . For this reason, it is difficult to level the tap face smoothly.

Therefore, various techniques for smoothing the tap face 9 by simple means have been studied.
For example, as shown in FIG. 3, a taping face chamfering bit 1 is attached to the tip of the rotary rod 6 of the opening machine, and a plurality of blade-like cutting edges 7 are attached to the tip of the taping face chamfering bit 1. Conventionally, a technique for leveling the tap face smoothly by rotating the rotating rod 6 has been used. Note that the protrusion 5 shown in FIG. 3 is inserted into the opening tap opening 10. By inserting the protrusion 5 into the spout 10 and performing the smoothing operation on the spout surface 9, it is possible to prevent vibration associated with the rotation of the rotating rod 6 and smooth the spout surface 9 smoothly. It becomes.

However, when the tap hole chamfering bit 1 shown in FIG. 3 is used, the blade edge 7 and the tap hole surface 9 are in linear contact with each other, so that the frictional resistance increases and the blade edge 7 is likely to be damaged. . If the wing-like cutting edge 7 is damaged, it is difficult to smooth the tap face.
Therefore, the present inventors attach a taping face chamfering bit 1 as shown in FIG. 4 to the tip of the rotary rod 6 of the opening machine, and a plurality of conical shapes on the tip face of the taping face chamfering bit 1 An experiment was conducted on a technique for smoothening the surface of the taphole by attaching the cutting edge 8 and rotating the rotary rod 6. Note that the protrusion 5 shown in FIG. 4 has the same function as the protrusion 5 of FIG.

From the result of the experiment, when using the tap hole surface cutting bit 1 shown in FIG. 4, the conical cutting edge 8 and the tap hole surface 9 contact each other in a dot-like manner (or on an extremely narrow surface), thereby reducing the frictional resistance. As a result, it has been found that the smoothing operation of the tap face can be performed smoothly and stably. However, even if some of the plurality of conical cutting edges 8 attached to the front end face are damaged or worn, the spout surface shaving bit 1 must be used. For this reason, the efficiency of the leveling work decreases with an increase in the number of times of use (that is, the number of leveling work) of the tapping face chamfering bit 1.
JP 2000-328117 A

  The present invention solves the above-mentioned problems, and when a part of a plurality of cutting edges attached to the tapping face chamfer bit needs to be replaced due to damage or wear, the corresponding cutting edge is replaced. It is an object of the present invention to provide a tapping face chamfering bit that can be easily exchanged and that can improve the efficiency of leveling work by always using a sharp cutting edge.

The present invention is an output port face shaving bit to be attached to a leveling device used to smooth the output port surface prior to injecting mud into the open output port. It is a spout face milling bit provided with a plurality of through holes for inserting a pedestal with a plurality of blade tips attached thereto.
In the tap hole face shaving bit of the present invention, it is preferable to use a rotating rod of an opening machine as a leveling device. Moreover, it is preferable that a blade edge is a cone-shaped blade edge.

  According to the present invention, when a part of the plurality of cutting edges attached to the tap face chamfer bit needs to be replaced due to damage, wear, or the like, the corresponding cutting edge can be easily replaced. As a result, it is possible to always use a sharp cutting edge and improve the leveling efficiency.

FIG. 1 is a perspective view schematically showing an example of a tap hole face shaving bit of the present invention.
The tap hole face shaving bit 1 of the present invention is provided with through holes 4 at a plurality of locations. The pedestals 2 are inserted into the through holes 4 respectively. However, in FIG. 1, there is one through hole 4 into which the base 2 is not inserted, but this is for illustrating the through hole 4. When carrying out the leveling work of the spout surface 9 by attaching the spout surface shaving bit 1 to the leveling device, the base 2 is inserted into all the through holes 4. The leveling device 9 can be smoothed evenly by pressing the tap surface 9 while rotating the tap bit surface cutting bit 1. In addition, it is preferable to use the rotating rod 6 of the opening machine because the leveling device does not require installation of equipment dedicated to leveling work.

In addition, the protrusion 5 shown in FIG. 1 is inserted into the opening tap opening 10. By inserting the protrusion 5 into the spout 10 and performing the smoothing operation on the spout surface 9, it is possible to prevent vibration associated with the rotation of the rotating rod 6 and smooth the spout surface 9 smoothly. It becomes.
A plurality of cutting edges 3 are attached to the distal end surface of the base 2. Although the shape of the blade edge 3 is not particularly limited, it is preferable to use a cone-shaped blade edge as shown in FIG. 4 because the friction between the blade edge 3 and the tap surface 9 can be reduced. The number and dimensions of the blade edge 3 may be set as appropriate according to the size of the tip surface of the base 2.

The number of through-holes 4 into which such pedestals 2 are inserted is set as appropriate according to the size of the taphole face cutting bit 1. However, it is necessary to arrange the through hole 4 so that the rotation locus of the pedestal 2 by the rotation of the tap hole chamfering bit 1 covers the tap hole surface 9.
1 is used to perform the leveling operation of the tap face 9 and if the cutting edge 3 is damaged or worn, the corresponding pedestal 2 is extracted. At that time, as shown in FIG. 2, when the back surface of the base 2 protrudes from the back surface of the tap hole biting bit 1, it can be easily removed by hitting the back surface of the base 2 with a hammer or the like. . If the back of the pedestal 2 does not protrude from the back surface of the tap hole chamfering bit 1, the base 2 can be easily made by inserting a rod into the through hole 4 from the back surface of the tap hole chamfering bit 1 and hitting it. Can be extracted.

A new pedestal 2 is inserted into the through hole 4 from which the pedestal 2 has been removed, and the leveling operation of the tap face 9 is always performed with a sharp blade edge.
As described above, the tap hole chamfering bit according to the present invention has a corresponding cutting edge (that is, a pedestal) when a part of the plurality of attached cutting edges needs to be replaced due to damage or wear. ) Can be easily replaced. As a result, it is possible to always use a sharp cutting edge and improve the leveling efficiency.

  The pedestal 2 was inserted into all the through holes 4 of the tapping surface 1 shown in FIG. 1 and attached to the tip of the rotary rod 6 of the opening machine, and the tapping surface 9 was leveled. A plurality of cone-shaped cutting edges were attached to the tip of the base 2 as the cutting edges 3. Repeating the leveling work by repeatedly using the tap face chamfering bit 1, and when the cutting edge 3 is damaged or worn, the base 2 is hit by hitting the corresponding base 2 from the back of the tap face chamfering bit 1. Removed and inserted a new pedestal. FIG. 6 shows the relationship between the number of leveling operations performed in this way and the required time. This is an invention example.

On the other hand, as a comparative example, the tap hole surface shaving bit 1 shown in FIG. 4 was attached to the tip of the rotary rod 6 of the opening machine, and the tap hole surface 9 was leveled. While the leveling operation was repeated, the conical cutting edge 8 was damaged or worn, but the same tapping surface 1 was used as it was. FIG. 7 shows the relationship between the number of leveling operations performed in this way and the required time.
As can be seen from FIG. 7, in the leveling operation of the comparative example, the conical cutting edge 8 in which breakage or wear has occurred must be used continuously, so that the required time tends to increase as the number of times increases. It is done. The fifth, tenth, and twelfth leveling operations took a great deal of time because the spout brick that formed the spout surface 9 had a high hardness of 11, so the spout surface 9 was smoothed. Shows that a long time was consumed.

On the other hand, since the leveling operation of the invention example always uses a sharp cutting edge, as shown in FIG.
The leveling work can be performed in a short time, and the required time is maintained at a low level even if the number of times increases. As shown in the data of the comparative example described above (ie, FIG. 7), the unevenness of the hardness of 11 is inevitably generated. It fluctuated. However, since the leveling operation of the invention example always uses a sharp cutting edge, an abnormal extension of the required time was not recognized.

It is a perspective view which shows typically the example of the taphole face grinding bit of this invention. It is sectional drawing which shows the example which inserted the base in the through-hole of the tap hole face-cutting bit of this invention. It is a perspective view which shows typically the example of the conventional tap face chamfering bit. It is a perspective view which shows typically the other example of the conventional tap face chamfering bit. It is sectional drawing which shows arrangement | positioning of a sprue opening and a mud gun when injecting mud. It is a graph which shows transition of the time required for leveling work of the example of an invention. It is a graph which shows transition of the required time of the leveling work of a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Barring face surface cutting bit 2 Base 3 Cutting edge 4 Through-hole 5 Protrusion 6 Rotating rod 7 Wing blade edge 8 Conical cutting edge 9 Barring edge surface
10 Outlet
11 Outing brick
12 Furnace wall brick
13 Mad Gun
14 Iron skin

Claims (3)

  Prior to injecting mud into an open spout, it is a spear bit that is attached to a leveling device used to level the spout surface smoothly. A tap hole biting bit characterized by having a plurality of through-holes for inserting a pedestal to which a base is attached.   2. The tapping face chamfering bit according to claim 1, wherein the leveling device is a rotary rod of an opening machine. The tapping face chamfering bit according to claim 1 or 2, wherein the cutting edge is a conical cutting edge.

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