JP7015607B1 - Manufacturing method of sinter crushing teeth - Google Patents

Abstract

It is used in a method for manufacturing a long hardened material and a sinter crusher that crushes the sinter produced by the sinter, and a wear-resistant layer is applied to the crushed portion side of the tooth body 11 in the length direction. The sintered ore crushing tooth 10 on which the 13 is formed and the manufacturing method thereof surround the core portion 12 provided on the crushed portion side of the tooth body 11 in the length direction thereof, and correspond to the shape of the wear-resistant layer 13. After arranging the molds 16 and 19 forming the hollow portions 15 and 18, the molten metal is continuously supplied into the molds 16 and 19 and discharged from the molds 16 and 19 to discharge the molten metal. A wear-resistant layer forming step of welding to the core portion 12 and further storing and solidifying the molten metal in the molds 16 and 19 is performed to form the wear-resistant layer 13.

Description

The present invention relates to a method for producing a sinter crushing tooth used in a sinter crusher that crushes a high-temperature sinter produced by the sinter.

As shown in FIG. 5, the sinter used in the blast furnace is connected in an endless belt shape, and the sinter raw material is fired by a sinter 81 equipped with a plurality of pallets 80 that move in one direction. It is manufactured. The sinter produced by the sinter 81 is discharged from the pallet 80 located in the sinter portion, and then the sinter crusher provided in the vicinity of the sinter portion (hereinafter, also simply referred to as a crusher). ) 82 is crushed to a predetermined particle size and supplied to the blast furnace.
The crusher 82 includes a fixed tooth 84 having a plurality of receiving teeth 83 arranged side by side at intervals, and a plurality of demon teeth 86 projecting from a rotating shaft 85 arranged above the fixed tooth 84. The sintered ore on the fixed tooth 84 is crushed by a plurality of receiving teeth 83 and a demon tooth 86 that enters between adjacent receiving teeth 83 by rotation of the rotating shaft 87. (See, for example, Patent Document 1).

As described above, since the crusher 81 crushes the high-temperature sintered ore, as shown in FIGS. 6A and 6B, the crushing portion side (upper side in use) of the receiving tooth 83. The wear-resistant layer 88 is formed in the length direction (longitudinal direction, long direction) (the same applies to the demon tooth).
The wear-resistant layer 88 is manufactured by, for example, overlay casting technology, and specifically, a steel grid 90 is welded to the surface of the tooth body 89 in advance to form a small block, and the grid 90 of the small block is formed. A hardened material made of granular or wire-shaped welding material of the required components is injected into the inside and melted by the arc heat of the carbon electrode, or the molten metal of white iron is gradually cast into the lattice 90 and the arc heat of the carbon electrode is used. It is formed by melting and fusing it with the tooth body 89. By forming the lattice 90 and casting it (overlay welding) in this way, it is possible to prevent the wear-resistant layer 88 from being cracked and peeled off due to the influence of the wall thickness.

Japanese Unexamined Patent Publication No. 4-9433

However, in the above-mentioned technique, shrinkage cavities and blow holes are generated in the wear-resistant layer 88, and defects and defects such as unwelded portions are generated between the lattice 90 and the wear-resistant layer 88, and these defects occur. The part is missing and falls off.
Therefore, the wear-resistant layer 88 is likely to be worn or chipped (particularly at the central portion in the length direction shown in FIG. 6B and both sides in the width direction orthogonal to the length direction), and the life is further extended. Was required. Further, since the hardened material is cast for each square of the lattice 90, there are many casting points and it takes time to manufacture, and a tinkering worker with a high skill level is required, which makes mass production difficult.
Since the arc heat of the carbon electrode is used to form the wear-resistant layer, a large amount of electric power is required and the manufacturing cost is high.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method for manufacturing a tooth for sinter crushing, which can be improved in wear resistance as compared with the conventional case and can be manufactured economically with good workability. And.

The method for producing a sinter crushing tooth according to the first invention according to the above object is a sinter crushing tooth for crushing a sinter supplied to a sinter crusher, and the sintering is performed. The ore crushing tooth is formed so as to surround the long tooth body portion, the core material integrally formed with the tooth body portion along the length direction of the tooth body portion, and the core material. In a method for manufacturing a sinter crushing tooth provided with a crushed portion made of an abrasion resistant layer that comes into contact with the sinter.
a) A step of erection and arranging the core material so that its length direction is the vertical direction.
b) A step of arranging a formwork A that surrounds the lowermost region of the core material and forms a cavity A corresponding to the shape of the wear-resistant layer between the core material and the core material.
c) The surface layer portion of the core material is softened or melted by continuously supplying the molten metal to the cavity A and discharging the molten metal from the cavity A and bringing the molten metal into contact with the core material. The process of welding the molten metal to the core material in a state and
d) The step of filling the cavity A with the molten metal to form a partial wear-resistant layer, and
e) A formwork that surrounds the next target area of the core material including the upper region of the molded partial wear-resistant layer and forms a cavity B corresponding to the shape of the wear-resistant layer between the core material and the hollow portion B. The process of arranging B and
f) A step of supplying molten metal to the cavity B and solidifying it while eliminating defects including shrinkage cavities generated in the partial wear-resistant layer.
g) By continuously supplying the molten metal to the cavity B and discharging the molten metal from the cavity B and bringing the molten metal into contact with the core material, the surface layer portion of the core material is softened or melted. The process of welding the molten metal to the core material in a state and
h) It has a step of filling the cavity B with molten metal to form a new partial wear-resistant layer.
After that, each step from e) to h) is performed a plurality of times in the length direction of the core material to form the wear-resistant layer.
The method for producing a sinter crushing tooth according to the second invention according to the above object is a sinter crushing tooth for crushing a sinter supplied to a sinter crusher, and the sintering is performed. The ore crushing tooth is formed so as to surround the long tooth body portion, the core material integrally formed with the tooth body portion along the length direction of the tooth body portion, and the core material. In a method for manufacturing a sinter crushing tooth provided with a crushed portion made of an abrasion resistant layer that comes into contact with the sinter.
The core material is divided in the length direction of the teeth for sinter crushing to be molded, and is placed vertically on the divided core material A arranged at the lowermost portion and on the upper side of the divided core material A. It is composed of a plurality of split core materials B,
a) The split core material A is arranged in contact with the inner side surface of the formwork A arranged at the lowermost portion, and the cavity portion A corresponding to the shape of the wear-resistant layer is formed between the split core material A and the formwork A. And the process of forming between
b) The surface layer portion of the divided core material A is formed by continuously supplying the molten metal to the cavity A and discharging the molten metal from the cavity A and bringing the molten metal into contact with the divided core material A. A step of welding the molten metal to the split core material A in a softened or melted state, and
c) The step of filling the cavity A with the molten metal to form a partial wear-resistant layer, and
d) A formwork B is arranged so as to surround the divided core material B and the divided core material B is in contact with the inner side surface, and between the divided core material B and the formwork B corresponding to the shape of the wear-resistant layer. The step of locating the cavity portion B formed in the above portion above the partial wear resistant layer, and
e) A step of supplying molten metal to the cavity B and solidifying it while eliminating defects including shrinkage cavities generated in the partial wear-resistant layer.
f) The surface layer portion of the divided core material B is formed by continuously supplying the molten metal to the cavity B and discharging the molten metal from the cavity B and bringing the molten metal into contact with the divided core material B. A step of welding the molten metal to the split core material B in a softened or melted state, and
g) It has a step of filling the cavity B with molten metal to form a new partial wear-resistant layer.
After that, each step from d) to g) is performed a plurality of times in the length direction of the core material to form the wear-resistant layer.

In the method for producing a tooth for sinter crushing according to the first and second inventions, a plurality of molten metal discharge ports are formed in the molds A and B in the length direction of the core material, and the respective molds A and B are formed. By opening and closing the discharge port, the molten metal is continuously supplied to the cavities A and B and the molten metal is continuously discharged from the cavities A and B to bring the surface layer portion of the core material into a softened or melted state. , The partial wear resistant layer can be formed.

In the method for manufacturing a tooth for crushing a sintered ore according to the present invention, the sintered ore crusher is arranged on a fixed tooth having a plurality of receiving teeth arranged at intervals and above the fixed tooth. A tooth for crushing a sintered ore, which has a rotating tooth provided with a plurality of demon teeth that are radially projected from the rotating shaft and enter between adjacent receiving teeth due to the rotation of the rotating shaft. It is preferable that the tooth is received.

In the method for manufacturing a tooth for crushing a sintered ore according to the present invention, the sintered ore crusher is arranged on a fixed tooth having a plurality of receiving teeth arranged at intervals and above the fixed tooth. A tooth for crushing a sintered ore, which has a rotating tooth provided with a plurality of demon teeth that are radially projected from the rotating shaft and enter between adjacent receiving teeth due to the rotation of the rotating shaft. May be the demon tooth.

In the method for producing a tooth for sinter crushing according to the present invention, the molten metal is supplied into the mold, the surface layer portion of the core material is in a softened or melted state, and the molten metal is welded to the core portion, so that the molten metal is welded to the core portion. The adhesion of the wear-resistant layer (hardened layer, the same applies hereinafter) is enhanced. Further, since the molten metal is stored in the mold and solidified, the wear-resistant layer can be integrally formed. Further, for example, since the lattice is not required and the arc heat is not required as in the conventional case, and the cooling rate of the molten metal is high, the wear-resistant layer to be formed can be hardened, and the wear-resistant layer to be formed can be hardened. You can improve your sex. It also eliminates the need for tinkering workers with a high degree of skill.
Therefore, a tooth for sinter crushing, which can improve wear resistance as compared with the conventional case, can be manufactured economically with good workability.

In particular, by eliminating the shrinkage cavities (cavities), the tissue can be made finer and the quality can be stabilized more than before.

(A) is a perspective view of a receiving tooth of a sinter crusher manufactured by the method for manufacturing a sinter crushing tooth according to an embodiment of the present invention, and (B) is a manufacturing of the sinter crushing tooth. It is explanatory drawing of the method. It is explanatory drawing of the manufacturing method of the sinter crushing tooth which concerns on other Examples of this invention. (A) to (G) are graphs showing the wear state of the wear-resistant layer of the receiving tooth manufactured by the method for manufacturing a sinter crushing tooth according to an experimental example. (A) is a graph showing the wear state of the receiving tooth manufactured by the method for manufacturing a sintered ore crushing tooth according to an experimental example, and (B) and (C) are manufacturing of a sintered ore crushing tooth according to a comparative example. The graph which shows the wear state of the receiving tooth manufactured by the method, (D) is the graph which shows the wearing state of the receiving tooth manufactured by the manufacturing method of the sintered ore crushing tooth which concerns on an experimental example. It is explanatory drawing which shows the manufacturing process of a sinter. (A) is a perspective view of a receiving tooth of a sinter crusher according to a conventional example, and (B) is an explanatory view showing a wear state of a wear-resistant layer of the receiving tooth.

Subsequently, an embodiment embodying the present invention will be described with reference to the attached drawings, and the present invention will be understood.
First, with reference to FIG. 1 (A), a tooth receiving (for sinter crushing) used in a sinter crusher manufactured by the method for manufacturing a sinter crushing tooth according to an embodiment of the present invention. An example of a tooth) 10 and a demon tooth (an example of a sintered ore crushing tooth, not shown) will be described.
The sinter ore crusher has a fixed tooth having a plurality of receiving teeth 10 and a rotating tooth having a plurality of protruding demon teeth provided on the surface of the roll to bite a large raw material, and is sintered. It crushes high-temperature sinter produced by the machine (see FIG. 5).

In the fixed teeth, a plurality of (for example, 10 or more) receiving teeth 10 are arranged in parallel (lattice-like) with an interval.
The receiving tooth 10 has a rod shape having a square cross section, and is a tooth body 11 and a core portion (base material, core material) 12 provided on the crushed portion side (upper side in use) of the tooth body 11. The tooth body 11 has a wear-resistant layer 13 welded to the core portion 12 and formed on the crushed portion side of the tooth body 11 in the length direction thereof (that is, the tooth body 11 has a tooth receiving portion 10). Of which, the portion excluding the core portion 12 and the wear-resistant layer 13).

The core portion 12 is made of steel, for example, and has an inverted T-shaped cross section, and is attached to the crushed portion side surface (upper surface) of the tooth body 11 along the length direction thereof.
The width Cw of the protruding portion of the core portion 12 is, for example, 0.05 to 0.3 times (preferably 0) the width of the wear-resistant layer 13 (the width in the direction orthogonal to the length direction of the tooth body 11) Rw. The height Ct of the core portion 12 (protruding portion) is, for example, 0.5 to 0.9 times the height Rt of the wear-resistant layer 13 (preferably, the lower limit is 0). It is about 6.6 times, the upper limit is 0.8 times), but it can be changed in various ways depending on the configuration of the receiving tooth (the shape can also be changed).

The core portion 12 is attached to the tooth body 11 by welding, but may be performed by, for example, a fastening means such as a bolt, or may be performed in combination with the fastening means. Further, the core portion may be integrated with the tooth body (the tooth body and the core portion may be integrally manufactured without being separated).
Further, the core portion 12 is divided at an intermediate position in the length direction of the tooth body 11 (here, the central portion in the length direction), but some of the core portions 12 are not divided depending on the type of fixed tooth.
As described above, when the wear-resistant layer 13 is worn out by attaching the core portion 12 integrally formed with the wear-resistant layer 13 to the tooth body 11 by welding or fastening means such as bolts, the teeth are worn out. The welded portion between the main body 11 and the core portion 12 is cut or the fastening means is removed, the core portion 12 is removed from the tooth main body 11, and the core portion 12 integrally formed with the new wear-resistant layer 13 is attached to the tooth main body 11. Just do it. Thereby, for example, it can be easily replaced at the site where it is actually used, and the core portion 12 and the tooth body 11 integrally formed with the wear-resistant layer 13 are individually formed during transportation to the site. Transportation costs can be reduced by transporting and assembling on-site.

The length of the wear-resistant layer 13 welded to each of the divided cores 12 (the length in the length direction of the tooth body 11) is, for example, about 500 mm or more (further, 1000 mm or more), and the upper limit value is Although not particularly limited, it is, for example, about 3000 mm. If the core portion is not divided, the wear-resistant layer can also be configured not divided.
The material of the wear-resistant layer 13 is mainly white pig iron based on high carbon and high chromium (for example, C: 4.0 to 5.5% by mass, Cr: 25 to 30% by mass, etc.). It exhibits extremely excellent durability when it is worn in a high temperature atmosphere. The material of the wear-resistant layer is not limited to the above-mentioned white pig iron as long as it is a metal material that can be used in a sinter crusher.

A tinkered overlay layer 14 is formed between the wear-resistant layers 13 adjacent to each other in the length direction of the tooth body 11 and on the upper side of the tooth body 11. As a result, the integrity between the tooth body 11 and the wear-resistant layer 13 is enhanced, and wear on the crushed portion side of the tooth body 11 can be suppressed.
A flow path for cooling water (not shown) is formed inside the tooth body 11 so that the temperature rise of the receiving tooth 10 during use can be suppressed (the tooth body 11 has a water-cooled structure). I have).

Since the rotary tooth has substantially the same shape as the rotary tooth 87 shown in FIG. 5, the reference numerals used in FIG. 5 will be added here for convenience. The rotary tooth 87 has a rotary shaft 85 arranged above the fixed tooth along a direction whose axis is perpendicular to the length direction of the receiving tooth 10 (tooth body 11) in a plan view, and a rotary shaft thereof. It is provided with a plurality of demon teeth 86 that are radially projected from the 85 and enter between the adjacent receiving teeth 10 due to the rotation of the rotating shaft 85.
The demon tooth of the present invention corresponding to this demon tooth 86 has a fan shape when viewed from the side, and is in the length direction of the tooth body and the crushed portion side (rotational direction downstream portion side in use) of the tooth body. It has a core portion (base material, core material) provided over (in the height direction about the rotation axis) and a wear-resistant layer welded to the core portion (that is, the tooth body has a tooth body. , The part of the demon tooth excluding the core and the wear-resistant layer).

The core is made of steel, for example, and has an inverted T-shaped cross section and is attached to the surface of the tooth body on the crushed portion side along the length direction thereof, depending on the shape of the demon tooth. Can be changed. This core portion may be separated from the tooth body or may be integrated with the tooth body (similar to the receiving tooth).
The material of the wear-resistant layer can be made of the same material as the wear-resistant layer of the receiving tooth 10 described above, but the type of material may be the same as or different from the wear-resistant layer of the receiving tooth 10. ..

Subsequently, a method for manufacturing the receiving tooth 10 will be described with reference to FIG. 1 (B).
First, as shown in the left figure of FIG. 1B, the core portion 12 of the receiving tooth 10 is vertically arranged so that its length direction is the vertical direction, and the lowermost region of the core portion 12 (described later). A formwork 16 for forming a cavity 15 corresponding to the shape of the wear-resistant layer 13 to be formed (the length in the longitudinal direction is divided) is arranged so as to surround the area to be the target of the first wear-resistant layer forming step. (The hollow portion 15 is formed by the mold 16 and the core portion 12). There is a refractory layer inside the formwork 16 (on the contact surface side with the molten metal) (the same applies to the formwork 19 described later).

Here, the entire core portion 12 is surrounded by the formwork 16 in a plan view (the core portion 12 is arranged in the cavity portion 15), but the surface side of the core portion 12 (the surface on which the wear-resistant layer 13 is formed). Only the side) may be surrounded by the formwork. Further, the core portion 12 is arranged in the formwork 16 in a state where it is not attached to the tooth body 11 (only in the core portion 12), but is arranged in the formwork 16 in a state where it is attached to the tooth body 11. You may.
It is preferable that the surface of the core portion 12 is subjected to unevenness treatment (for example, blast treatment) in advance, and a welding accelerator is applied so that the wear resistant layer 13 can be easily welded.

Next, the molten metal is continuously supplied (pouring) into the mold 16 (cavity 15) and discharged from the mold 16 to weld the molten metal to the core 12, and then further. A wear-resistant layer forming step is performed in which the molten metal is stored (filled) in the mold 16 and solidified (to be in a semi-solidified state over a predetermined time).
Here, the molten metal is supplied to the mold 16 and the molten metal is discharged from the mold 16 until the surface layer portion of the core portion 12 is in a softened state or a molten state. Therefore, the temperature of the molten metal is preferably set to a temperature higher than the melting point Ctm of the core portion 12 (for example, (Ctm + 20 ° C.) or higher, further (Ctm + 50 ° C.) or higher, more preferably (Ctm + 100 ° C.) or higher). .. On the other hand, the upper limit of the temperature of the molten metal is not particularly limited, but is about (Ctm + 200 ° C.) in consideration of the electric power for raising the temperature of the molten metal, damage to the mold, and the like.

Subsequently, as shown in the middle figure of FIG. 1 (B), the next including the upper region of the semi-solidified portion 17 (a part of the formed wear-resistant layer 13) formed in the above-mentioned wear-resistant layer forming step. A mold 19 for forming a cavity 18 corresponding to the shape of the wear-resistant layer 13 to be formed (the length in the longitudinal direction is divided) is arranged so as to surround the region (the target area of the second wear-resistant layer forming step). Then, the above-mentioned wear-resistant layer forming step is performed.
As shown in the right figure of FIG. 1B, the process of arranging the formwork and forming the wear-resistant layer (step of fixing the molten metal to the core portion 12) is performed over the length direction of the core portion 12 (lower side). Repeat multiple times (from to the top). The number of repetitions (predetermined number of times) of the wear-resistant layer forming step is determined by the number of molds (length of the wear-resistant layer 13 to be formed).

The second and subsequent wear-resistant layer forming steps described above are performed while eliminating (breaking) the shrinkage cavities 20 generated in the semi-solidified portion 17 formed by the previously performed wear-resistant layer forming step (semi-solidified state of the previous step). The hot water is mixed with the newly poured hot water and coagulated while eliminating the shrinkage cavities of the hot water in the previous process, that is, without leaving any defects such as shrinkage cavities inside).
Therefore, it is preferable that the semi-solidified portion 17 is not in a completely solidified state, but is in a semi-solidified state in which at least the upper portion thereof is in a softened state (furthermore, the upper central portion is in a molten state). Here, the softened state is, for example, a state in which the temperature is lower than the melting point Rtm of the wear-resistant layer 13 in the range of 200 to 50 ° C. (Rtm- (200 to 50 ° C.)), and is, for example, after pouring the molten metal. The second and subsequent wear-resistant layer forming steps can also be performed based on the elapsed time (for example, about several minutes from the end of pouring: the relationship between the temperature of the semi-solidified portion 17 and the elapsed time obtained in advance).

Finally, by pressing the hot water, the wear-resistant layer 13 is formed on the core portion 12.
After the wear-resistant layer 13 manufactured by the above method is attached to the tooth body 11 via the core portion 12, the wear-resistant layer 13 is attached between the adjacent wear-resistant layers 13 of the tooth body 11 and on the upper side of the tooth body 11. By forming the tinker overlay layer 14, it can be used as the receiving tooth 10.
As for the demon tooth, as in the case of the receiving tooth 10 described above, the core portion of the demon tooth is vertically arranged so that the length direction (height direction) is the vertical direction, and the core portion is surrounded by the demon tooth. A wear-resistant layer is formed by arranging a mold for forming a cavity corresponding to the shape of the wear-resistant layer to be formed and performing the above-mentioned wear-resistant layer forming step once or a plurality of times.

Next, with reference to FIG. 2, a method for manufacturing a sinter crushing tooth according to another embodiment of the present invention will be described. The sintered ore crushing tooth according to the present embodiment is a receiving tooth, and since this receiving tooth has substantially the same structure as the above-mentioned receiving tooth 10 in appearance, only different parts will be described in detail.
The core portion 31 of the receiving tooth is composed of a plurality of (here, three) divided core portions 32 divided in the length direction thereof. Therefore, the formwork 33 to be used is also composed of a plurality of divided formwork 34 (here, three corresponding to the number of the divided core portions 22) arranged for each divided core portion 22. This is to improve the weldability of the molten metal to the core portion 31.
There is a refractory layer inside the formwork 33 (divided formwork 34) (contact surface with the molten metal).

If the core is long, for example, if the length is more than 1000 mm, the length of the formwork will also be more than 1000 mm corresponding to the length of the core, and if the molten metal is supplied from above the formwork, it will be high. The flow of the molten metal is disturbed in the middle of the vertical direction, making it difficult for the molten metal to weld.
Therefore, as described above, by dividing the core portion and the mold into a plurality of pieces, the flow of the molten metal can be stabilized and the welding of the molten metal can be improved. The lengths of the split core portion and the split mold are not particularly limited as long as the molten metal can be welded stably, but are, for example, 1000 mm or less (preferably 800 mm or less, further 600 mm or less). It should be about the same. On the other hand, the lower limit value is not particularly limited, but is, for example, about 200 mm.

First, as shown in the left figure of FIG. 2, the cavity 37 corresponding to the shape (longitudinal length is divided) of the wear-resistant layer 36 (similar to the above-mentioned wear-resistant layer 13) formed on the base 35. The split formwork 34 having the above is erected and arranged so that its length direction is the vertical direction. In the split formwork 34, a split core portion 32 having an inverted T-shaped cross section is provided so that its wide surface is in contact with one inner side surface 38 of the split formwork 34, and its length direction is the vertical direction. (The split core portion 32 is surrounded by the split formwork 34) so as to be vertically arranged.
A plurality of (here, five) openings 39 are formed in the divided formwork 34 at intervals in the length direction (height direction). The opening 39 is a discharge port for molten metal, and communicates the hollow portion 37 of the split form 34 with the outside.

Of these five openings 39, only the opening 39 located at the bottom is in the open state (the other four openings 39 are in the closed state), and the molten metal is melted into the split form 34 (cavity 37). After the molten metal is welded to the split core portion 32 by continuously supplying and discharging the molten metal from the split mold 34, the opening 39 located at the lowermost portion is closed, and the molten metal is further divided into the split mold. A wear-resistant layer forming step of storing and solidifying in 34 is performed (the wear-resistant layer forming step is performed by opening and closing each opening 39).
At this time, if the welding of the molten metal is poor with respect to the upper region of the split core portion 32, for example, the opening 39 at a position lower than the height position to be welded is closed, and the opening 39 above the opening 39 is closed. It is also possible to continuously supply the molten metal into the split mold 34 (cavity 37) and discharge the molten metal from the split mold 34 in the open state.

After performing the wear-resistant layer forming step described above, as shown in the middle figure of FIG. 2, the length of the core portion 31 is placed on the split core portion 32 and the split formwork 34 used in the wear-resistant layer forming step. The split core portion 32 and the split formwork 34 to be used in the next wear-resistant layer forming step are placed along the direction, and this wear-resistant layer forming step is performed (that is, only the opening 39 located at the bottom is opened. After the molten metal is continuously supplied and discharged, the molten metal is solidified by closing the opening 39 located at the lowermost part). The split formwork 34 adjacent to each other in the length direction can be prevented from being displaced by connecting the flange portions 40 provided at the end portions in the length direction with fastening means such as bolts.

As shown in the right figure of FIG. 2, the arrangement of the divided formwork 34 and the divided core portion 32 and the wear-resistant layer forming step are repeated a plurality of times in the length direction of the core portion 31. The number of repetitions of the wear-resistant layer forming step is determined by the number of the divided formwork 34 and the divided core portion 32 (the length of the wear-resistant layer 36 to be formed).
The second and subsequent wear-resistant layer forming steps described above are performed while eliminating (breaking) the shrinkage cavities generated in the semi-solidified sites formed by the wear-resistant layer forming step performed last time. In the second and subsequent wear-resistant layer forming steps, as described above, after the previous wear-resistant layer forming step (pouring of molten metal) is completed, the upper part of the semi-solidified portion formed is in a softened state (further. It is preferable to carry out the process in a state where the upper central portion is in a molten state) in order to integrally form the wear-resistant layer 36.

Finally, by pressing the hot water, the wear-resistant layer 36 is formed on the core portion 31.
After the wear-resistant layer 36 is manufactured by the above method, the formwork 33 (all the divided formwork 34) is removed from the core portion 31 and the wear-resistant layer 36.
Here, since each of the divided core portions 32 constituting the core portion 31 is integrated in the length direction only with the wear resistant layer 36, the divided core portions 32 adjacent to each other in the length direction are welded together, for example. The strength can be improved by integrally joining them. Further, the manufactured wear-resistant layer 36 can be surface-treated if necessary.
After the above-mentioned wear-resistant layer 36 is attached to the tooth body (similar to the tooth body 11) via the core portion 31, the wear-resistant layer 36 is attached between the adjacent wear-resistant layers 36 of the tooth body and on the upper side of the tooth body. By forming a tinker overlay layer (similar to the tinker overlay layer 14), it can be used as a receiving tooth.

Experimental example

Next, an experimental example conducted for confirming the action and effect of the present invention will be described.
Here, a tooth receiving tooth manufactured by using the method for manufacturing a tooth for sinter crushing of the present invention (experimental example) and a tooth receiving tooth manufactured by using a conventional overlay casting technique (comparative example: FIG. 6). A) and) were used in actual operations, and their wear conditions were compared and examined.
The results of the experimental examples are shown in FIGS. 3 (A) to (G) and 4 (A) and (D), and the results of the comparative example are shown in FIGS. 4 (B) and 4 (C), respectively. Note that FIG. 4A is the same graph as FIG. 3D, and FIG. 4D is the same graph as FIG. 3E.

3A to 3G are graphs showing the wear status of the wear-resistant layer at positions of 90 mm, 190 mm, 290 mm, 390 mm, 490 mm, 590 mm, and 690 mm, respectively, from one end in the length direction of the wear-resistant layer. Is. Further, FIGS. 4B and 4C are graphs showing the wear state of the wear-resistant layer at a position where the distance from one end in the length direction of the wear-resistant layer is 450 mm.
Here, the vertical axis of each graph indicates the height (mm) of the wear-resistant layer from the measurement reference position, and the horizontal axis indicates the width of the wear-resistant layer (0 is the center position in the width direction: mm). There is.
In each graph, the alternate long and short dash line is the contour shape of the wear-resistant layer before use, the dotted line is the contour shape of the wear-resistant layer 3 months after the start of the test, and the solid line is the contour shape of the wear-resistant layer 6 months after the start of the test. The contour shape of the wear-resistant layer is shown.

As shown in FIGS. 3 (A) to 3 (G), in the experimental example, the wear of the corner portion in the width direction of the wear-resistant layer and the wear of the portion where the demon teeth approach are larger than those of the other portions. However, a substantially uniform wear condition was obtained over the length direction of the wear-resistant layer (the thickness of the wall thinning due to wear is about 8 mm at the maximum and about 2 mm at the minimum).
On the other hand, in the comparative example, as shown in FIGS. You can see that. This is because it is clear in comparison with FIGS. 4 (A) and 4 (D), which are positions substantially similar to the positions showing the wear status in FIGS. 4 (B) and 4 (C). It is 12 mm, which is 1.5 times as much as the maximum value of the experimental example, and 3 times as much as the thickness reduction in FIG. 4 (D), which is a substantially similar position).

From the above, by the method for manufacturing a sinter crushing tooth of the present invention, a sinter crushing tooth can be manufactured economically with good workability, and the manufactured sinter crushing tooth is more than before. It was confirmed that the wear resistance could be improved.

Although the present invention has been described above with reference to Examples, the present invention is not limited to the configuration described in the above-described Examples, but is within the scope of the matters described in the claims. It also includes other examples and modifications that can be considered in. For example, the case where a part or all of each of the above-mentioned Examples and Modifications is combined to form the method for producing a tooth for sinter crushing of the present invention is also included in the scope of rights of the present invention.
In the above embodiment, the case where the receiving tooth and the devil tooth are manufactured by using the method for manufacturing the sintered ore crushing tooth of the present invention has been described, but only one of the receiving tooth and the devil tooth is manufactured. (The other may be a conventional method using overlay casting technology).
Further, the method for producing a tooth for crushing a sintered ore of the present invention is not limited to being applied to a receiving tooth and a devil tooth having the above-described configuration, and is used for a sinter crushing machine having another configuration. It can also be applied to teeth for crushing ore.

Then, in the above-described embodiment, the case where the wear-resistant layer is formed (the wear-resistant layer forming step is performed) using only the core portion (in a state where the wear-resistant layer is not attached to the tooth body) has been described. A wear-resistant layer can also be formed on the core portion in the attached state. Further, the core portion (which may be attached to the tooth body) forms the wear-resistant layer at room temperature, but at least the wear-resistant layer is formed before the wear-resistant layer is formed (the entire core portion). However, it is preferable to preheat the tooth body). This preheating temperature is lower than the melting point Ctm of the core, for example, (Ctm-20 ° C) or lower, further (Ctm-50 ° C) or lower, and the lower limit is about 200 ° C, further about 500 ° C. Is. As a result, when performing the wear-resistant layer forming step, it is possible to shorten the time until the surface layer portion of the core portion becomes a softened state (further, a molten state).

According to the method for manufacturing a sinter crushing tooth according to the present invention, a sinter crushing tooth (for example, a receiving tooth and a demon tooth) can be manufactured economically with good workability, and the manufactured sinter crushing tooth can be manufactured. Can improve wear resistance as compared with the conventional method. As a result, it can be effectively used for crushing high-temperature sinter produced by a sinter.

10: Receiving tooth (sintered ore crushing tooth), 11: Tooth body, 12: Core part, 13: Abrasion resistant layer, 14: Casting overlay layer, 15: Cavity part, 16: Formwork, 17: Semi-solidification Part, 18: Cavity, 19: Formwork, 20: Sinter, 31: Core, 32: Divided core, 33: Formwork, 34: Formwork, 35: Base, 36: Abrasion resistant layer, 37 : Cavity, 38: Inner surface, 39: Opening, 40: Flange

Claims (8)

A tooth for sinter crushing that crushes the sinter supplied to the sinter crusher, and the sinter crushing tooth is a long tooth body portion and the length of the tooth body portion. Sintered ore provided with a core material integrally formed with the tooth body along the sinter direction and a crushed portion formed of a wear-resistant layer formed so as to surround the core material and in contact with the sintered ore. In the method of manufacturing teeth for crushing
a) A step of erection and arranging the core material so that its length direction is the vertical direction.
b) A step of arranging a formwork A that surrounds the lowermost region of the core material and forms a cavity A corresponding to the shape of the wear-resistant layer between the core material and the core material.
c) The surface layer portion of the core material is softened or melted by continuously supplying the molten metal to the cavity A and discharging the molten metal from the cavity A and bringing the molten metal into contact with the core material. The process of welding the molten metal to the core material in a state and
d) The step of filling the cavity A with the molten metal to form a partial wear-resistant layer, and
e) A formwork that surrounds the next target area of the core material including the upper region of the molded partial wear-resistant layer and forms a cavity B corresponding to the shape of the wear-resistant layer between the core material and the hollow portion B. The process of arranging B and
f) A step of supplying molten metal to the cavity B and solidifying it while eliminating defects including shrinkage cavities generated in the partial wear-resistant layer.
g) By continuously supplying the molten metal to the cavity B and discharging the molten metal from the cavity B and bringing the molten metal into contact with the core material, the surface layer portion of the core material is softened or melted. The process of welding the molten metal to the core material in a state and
h) It has a step of filling the cavity B with molten metal to form a new partial wear-resistant layer.
Hereinafter, each step from e) to h) is performed a plurality of times in the length direction of the core material to form the wear-resistant layer, which is a method for producing a tooth for sinter crushing. .. A tooth for sinter crushing that crushes the sinter supplied to the sinter crusher, and the sinter crushing tooth is a long tooth body portion and the length of the tooth body portion. Sintered ore provided with a core material integrally formed with the tooth body along the sinter direction and a crushed portion formed of a wear-resistant layer formed so as to surround the core material and in contact with the sintered ore. In the method of manufacturing teeth for crushing
The core material is divided in the length direction of the teeth for sinter crushing to be molded, and is placed vertically on the divided core material A arranged at the lowermost portion and on the upper side of the divided core material A. It is composed of a plurality of split core materials B,
a) The split core material A is arranged in contact with the inner side surface of the formwork A arranged at the lowermost portion, and the cavity portion A corresponding to the shape of the wear-resistant layer is formed between the split core material A and the formwork A. And the process of forming between
b) The surface layer portion of the divided core material A is formed by continuously supplying the molten metal to the cavity A and discharging the molten metal from the cavity A and bringing the molten metal into contact with the divided core material A. A step of welding the molten metal to the split core material A in a softened or melted state, and
c) The step of filling the cavity A with the molten metal to form a partial wear-resistant layer, and
d) A formwork B is arranged so as to surround the divided core material B and the divided core material B is in contact with the inner side surface, and between the divided core material B and the formwork B corresponding to the shape of the wear-resistant layer. The step of locating the cavity portion B formed in the above portion above the partial wear resistant layer, and
e) A step of supplying molten metal to the cavity B and solidifying it while eliminating defects including shrinkage cavities generated in the partial wear-resistant layer.
f) The surface layer portion of the divided core material B is formed by continuously supplying the molten metal to the cavity B and discharging the molten metal from the cavity B and bringing the molten metal into contact with the divided core material B. A step of welding the molten metal to the split core material B in a softened or melted state, and
g) It has a step of filling the cavity B with molten metal to form a new partial wear-resistant layer.
Hereinafter, each step from d) to g) is performed a plurality of times in the length direction of the core material to form the wear-resistant layer, which is a method for producing a tooth for sinter crushing. .. In the method for producing a tooth for sinter crushing according to claim 2, each step from d) to g) is performed a plurality of times to form the wear-resistant layer, and then the divided core materials A and B are formed. The molds A and B are removed from the core material and the wear-resistant layer formed on the core material, and the divided core materials A and B adjacent to each other in the length direction are integrally welded to each other. A method for producing a tooth for sinter crushing, which comprises joining. In the method for producing a tooth for sinter crushing according to any one of claims 1 to 3, a plurality of molten metal discharge ports are formed in the molds A and B in the length direction of the core material. By opening and closing each of the discharge ports, the molten metal is continuously supplied to the cavities A and B and the molten metal is continuously discharged from the cavities A and B to soften or melt the surface layer portion of the core material. A method for producing a tooth for sinter crushing, which comprises forming the partial wear-resistant layer after the state is set. The method for producing a tooth for sinter crushing according to any one of claims 1 to 4, wherein the surface of the core material is subjected to unevenness treatment in advance. The method for producing a tooth for sinter crushing according to claim 5 is characterized in that a welding accelerator is applied to the surface of the core material that has been subjected to the unevenness treatment so that the wear-resistant layer can be easily welded. A method for manufacturing teeth for sinter crushing. In the method for producing a tooth for crushing a sintered ore according to any one of claims 1 to 6, the sintered ore crusher is a fixed tooth having a plurality of receiving teeth arranged at intervals. , Has and manufactures a rotating tooth provided with a plurality of demon teeth that are radially projected onto a rotating shaft arranged above the fixed tooth and that enter between adjacent receiving teeth due to the rotation of the rotating shaft. A method for manufacturing a tooth for crushing a sintered ore, wherein the tooth for crushing the sintered ore is the receiving tooth. In the method for producing a tooth for crushing a sintered ore according to any one of claims 1 to 6, the sintered ore crusher is a fixed tooth having a plurality of receiving teeth arranged at intervals. , Has and manufactures a rotating tooth provided with a plurality of demon teeth that are radially projected onto a rotating shaft arranged above the fixed tooth and that enter between adjacent receiving teeth due to the rotation of the rotating shaft. A method for manufacturing a tooth for crushing a sintered ore, characterized in that the tooth for crushing the sintered ore is the demon tooth.

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