KR20000014612A - Bit for lacunae trunk apeture of smelting furnace and a process thereof - Google Patents

Abstract

PURPOSE: Bit for lacunae trunk apeture is manufactured with tip of fleet and body of bit in a body able to produce largely and easily and improve operation efficiency of digging operation by improving durability. CONSTITUTION: Bit for lacunae trunk apeture to maintain consolidation state of ultra light alloy tip and body of bit, to prevent shed of ultra light alloy tip by furious flames and crack in lacunae of trunk apeture by improving durability is manufactured by disposition fixation ultra light alloy tip in molding frame interior having space similar to outer form of bit body in caliber part, injecting liquidized wax using hydraulic press in molding frame, separating molding frame after solidified injected wax, coating outer mould separated from molding frame over 6times, preheating ultra light alloy tip at the temperature of 1200°C, removing wax by heating mould formed with coating layer, injecting molten broth in the state of preheat for ultra light alloy tip, air cooling to cooling injected molten broth sufficiently, second process and surface treat after cooling.

Description

Bit for opening the exit of the furnace and its manufacturing method

The present invention relates to a bit for opening the exit port of the furnace and a method for manufacturing the same. More specifically, by allowing the tip and the bit body of the tip to be integrally manufactured, mass production can be easily performed, and the excavation work is improved by improving durability. Disclosed is a bit for opening a port opening and a method of manufacturing the same, which can improve the workability of the device.

For example, the furnace is provided with an outlet for discharging the inner molten iron to the outside, and the outlet is closed by mud material, which is an irregular refractory material, and when the inner molten iron is discharged, the molten iron is opened by opening its outlet. It is to be discharged to outside large tap water.

As described above, when opening the outlet for discharging the molten iron in the furnace, the outlet 10 is installed in the state in which the opening machine 2 is mounted on the support 8 formed on the outer wall 6 of the furnace 4 as shown in FIG. Will be excavated.

That is, the opener 2 is mounted on one side of the frame 12 having a predetermined length so that the pneumatic motor can be moved forward and backward, and the opening bit (for opening) at the end of the rotary shaft 16 of the pneumatic motor 14 18) has a configuration in which the drilling rod 20 is mounted.

Accordingly, the opening bit 16 drills the mud material 22 closing the exit port 10 while rotating according to the driving of the pneumatic motor 14 to open the exit port 10. (16) is supplied with a coolant, which is a mixture of water and nitrogen, for cooling the distal end and discharging residue.

In addition, the bit 18 used in the opening work process of the exit port 10 as described above is required to have great durability due to a large frictional heat and a strong impact due to the rotational friction and the hammering with the mud material 22. As shown in FIGS. 11 and 12, the conventional opening bit forms a “T” shaped groove 102 at equal intervals on the outer periphery of the tip body 100 separately manufactured in a predetermined shape, and the groove 102 thereof. By inserting the cemented carbide tip 104 in the) is manufactured by the process of joining by brass welding means.

However, when manufacturing the bit for opening as described above, the process of machining the "T" type groove on the separately formed bit body is complicated, and the productivity decreases due to excessive time for inserting the cemented carbide tip and joining work by brass welding. There is a problem.

In addition, the cemented carbide tip and the bit body is bonded by the brass welding bar, the gap between them, as well as deterioration of the brass welding portion in the excavation process of the exit port, this region is fragile and excessive in the excavation process As cracks are generated by the impact of drilling and hammering, there is a problem of diminishing the excavation and porosity due to breakage and separation of the cemented carbide tips.

Therefore, the present invention was created to solve the above problems, the object of the present invention is to be able to manufacture the tip and the bit body of the tip integrally, it is possible to mass production easily, and to improve the durability of the excavation work An object of the present invention is to provide a bit for opening a port opening and a method of manufacturing the same.

1 is a state of use of the opening machine for explaining the application of the bit produced by the present invention.

Figure 2 is a partially cut away perspective view of a bit made in accordance with the present invention.

3 is a cross-sectional view taken along the line II of FIG. 2.

4 is a perspective view of a tip applied to the bit according to the present invention;

5 to 9 are views showing the manufacturing process of the bit according to the present invention.

10 is a flow chart showing the manufacturing process of the bit according to the present invention.

11 is a perspective view of a conventional bit.

12 is a cross-sectional view taken along the line II-II of FIG.

In order to achieve the above object, the present invention, there is formed a coolant supply hole for supplying a coolant therein, the tip is made of a concave-convex shape, the recess is extended to the notch groove to the middle of the bit body, projections In the radial opening bit of the opening of the furnace, in which the entire portion and the horizontal portion of the tip except for the vertical end of the "T" type cemented carbide tip are inserted and fixed,

Forming a square projection at one side end of the vertical portion and the horizontal portion of the cemented carbide tip to provide a bit for opening the exit port of the furnace formed integrally with the bit body by the casting method in a state in which the square projection is disposed toward the axis center. do.

12. A method for manufacturing the opening bit, the method comprising: arranging and fixing the cemented carbide tip inside an mold frame having a space portion having the same shape as the outer shape of the bit body in the inner diameter portion; Injecting a liquid wax into the mold using a hydraulic press or the like; Separating the mold after the wax injected in the step is solidified; Performing a coating operation six times on the outside of the model separated from the mold in the step; Heating the model having the coating layer formed thereon to remove wax and preheating the cemented carbide tip to about 1200 ° C .; Injecting molten metal in the preheated cemented carbide tip; Performing air cooling to sufficiently cool the molten metal injected in the step; When the cooling is completed in the above step, there is provided a bit manufacturing method for opening the exit port of the furnace consisting of performing a post-treatment and surface processing.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described in detail.

2 and 3 are a perspective view and a cross-sectional view of the bit produced according to the present invention, wherein the bit 18 according to the present invention is a vertical portion of the “T” type cemented carbide tip 26 at the tip of the bit body 24. 28) The portion except for the tip and the entire horizontal portion 30 are buried to be integrally formed.

In addition, a coolant supply hole 32 capable of supplying a coolant is formed in the bit body 24, and a tip of the bit body 24 is formed in a concave-convex shape, and the concave indentation part 34 has a notched groove up to the middle of the bit body 24. 36, and the carbide 38 is buried radially in the protrusion 38.

In the above, the coolant supply hole 32 is disposed in the center and the outside of the shaft is a plurality of coolant made of water and nitrogen is ejected as in the prior art, its coolant serves to cool the tip of the bit 18 and discharge the residual Done.

In addition, the cemented carbide tip 26 is formed with a protrusion 40 at one end of the junction portion of the vertical portion 28 and the horizontal portion 30 as shown in FIG. 4 so that the protrusion 40 faces the center of the shaft. By doing so, a firm fixing with the bit body 24 is achieved.

In the drawings, the shape of the protrusion 40 is illustrated as being formed in a rectangular shape, but is not limited thereto, and may be any shape protruding from the site.

This is because the protrusion 40 is buried more deeply in the bit body 24 than the horizontal portion 28 to serve as a locking jaw bar bar, which can prevent the detachment of the cemented carbide tips 26 This is because any form can be satisfied.

In manufacturing the bit 18, in the present invention, as shown in Fig. 5, the cemented carbide tip 26 in the mold frame 42 having a space portion having the same shape as the outer shape of the bit body 24 in the inner diameter portion. Place it.

After injecting the liquidized wax 46 into the mold 42 using a hydraulic press or the like, the mold 42 is separated after the wax 44 is solidified.

Then, as shown in FIG. 6, in the state where the cemented carbide tip 26 is embedded in the solidified wax 44, the model 46 having the shape of the opening bit 18 is formed.

The coating is performed on the model made as described above, and the coating is performed in six steps as shown in the following table.

Process action Primary Secondary 3rd 4th 5th 6th Main raw material ZIRCON FLOUR # 350 ZIRCON PRIME SAND # 100 CHAMOTTE FLOUR # 70 CHAMOTTE FLOUR # 50 CHAMOTTE FLOUR # 5 CHAMOTTE FLOUR # 35 Mixing ratio FLOUR: NYACOL 14301: 2 SAND: NYACOL 14301: 2 FLOUR: NYACOL 14301: 2 FLOUR: NYACOL 14301: 1.5 FLOUR: NYACOL 14301: 1.5 FLOUR: NYACOL 14301: 1.5 Coating thickness 0.2-0.3mm 1.5 to 1.8 mm 1.5-2mm 2.0-2.2mm 2.0 to 2.3 mm 2.8-3.2mm time 2 to 3 min 2 to 3 min 2 to 3 min 2 to 3 min 4 to 5 min 5Min Drying time 8Hr 12Hr 15Hr 15Hr 18Hr 24Hr

Since the coating operation as described above is a known coating operation used to make a mold, a detailed description thereof will be omitted.

When the coating operation is completed as described above, the coating layer 48 is formed to a predetermined thickness on the outside of the opening bit model 46 as shown in FIG.

As described above, the semi-finished product having the coating layer 48 is heated in a heating furnace again for a predetermined temperature and time to remove the wax 44 therein. In this case, the wax 44 is heated at approximately 300 ° C. for 30 minutes to completely remove the wax 44. By removing it, as shown in FIG. 8, only the cemented carbide tip 18 remains inside the coating layer 48.

That is, in this state, the coating layer 50 becomes one mold.

In the above state, the cemented carbide tip 18 is heated again for a predetermined temperature and time. In this case, after heating at approximately 1200 ° C. for 1 hour, the molten metal is poured into the space in which the wax 44 is removed, as shown in FIG. 9. After cooling and air-cooling for about 24 hours, it is then removed and cut in the post-treatment process (separation from the product and the tap water), and then turned and drilled in the surface treatment process to finally open the bit 18 as shown in FIG. To produce.

The pre-heating of the cemented carbide tip 26 at 1200 ° C. for 1 hour is to achieve the best bonding state with the molten metal at the time of injecting the molten metal. This is because cracking of the tip 26 and generation of gas and bubbles are a main cause of incompatibility and fabrication, and if the preheating is excessive, the material becomes weak due to the change of components of the cemented carbide tip 26.

Looking at the overall flow of the manufacturing process of the opening bit 18 made as described above, as shown in Figure 10, in the first step (S10) in the inner diameter portion of the space portion of the same shape as the outer shape of the bit body 24 The cemented carbide tip 26 is disposed and fixed inside the mold 42 having a liquid, and in the second step S20, the liquefied wax 46 is injected into the mold 42 using a hydraulic press or the like.

In the third step S30, the mold 44 is separated after the wax 44 is solidified. In the fourth step S40, the mold 46 is separated from the mold 46 separated from the mold 42. The coating process is performed six times, and in the fifth step S50, the wax 44 is removed by heating while the coating layer 48 is formed on the outside of the model 46, and the cemented carbide tip 26 is 1200. Preheat to about ℃.

In the sixth step (S60), the molten metal is injected into the coating layer 48 in a state where the cemented carbide tip 26 is preheated as described above, and in the seventh step (S70), cooling is performed to sufficiently cool the injected molten metal. And, in the eighth step (S80) is to process the post-treatment and surface, in this case, the coating layer 48 is removed and the surface of the bit body 24 is processed by turning work, such as coolant supply hole 32 by drilling work, etc. If the process is completed, the manufacturing work of the opening bit 18 is completed.

As described above, according to the present invention, it is possible to produce a bit for opening the furnace opening by the casting method, so that mass production can be performed in a short time, thereby achieving a cost reduction as well as a productivity improvement.

In addition, by heating the cemented carbide tips to the appropriate temperature and injecting molten metal, the cemented carbide tips and the bit body are maintained in a good state of fixation and bonding, while the durability is greatly improved. It is possible to improve workability by fundamentally blocking the occurrence of all problems such as preventing the tip from falling off.

Claims (2)

A coolant supply hole for supplying a coolant is formed therein, and a tip of the coolant supply hole is formed in an uneven shape, the recess of which extends into the notch groove up to the middle of the bit body, and the protrusion is radially perpendicular to the tip of the cemented carbide tip. In the bit opening port opening of the furnace in which the part except the sub-tip and the whole horizontal part are inserted and fixed, Opening opening of the furnace, characterized in that formed by forming a square protrusion on the one side end of the vertical portion and the horizontal portion of the cemented carbide tip so that the square projection is disposed toward the center of the shaft and integrally formed with the bit body by a casting method. Public bit. Arranging and fixing the cemented carbide tip in a mold having an inner diameter and a space having the same shape as the outer shape of the bit body; Injecting a liquid wax into the mold using a hydraulic press or the like; Separating the mold after the wax injected in the step is solidified; Performing a coating operation six times on the outside of the model separated from the mold in the step; Heating the model having the coating layer formed thereon to remove wax and preheating the cemented carbide tip to about 1200 ° C .; Injecting molten metal in the preheated cemented carbide tip; Performing air cooling to sufficiently cool the molten metal injected in the step; Performing the post-treatment and surface finishing when cooling is completed in the above step; The manufacturing method of the bit opening part of the tap opening of a blast furnace.