CN113523742B - Manufacturing method of T-shaped wear-resistant layer drill bit for blast furnace tapping - Google Patents
Manufacturing method of T-shaped wear-resistant layer drill bit for blast furnace tapping Download PDFInfo
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- CN113523742B CN113523742B CN202110756462.6A CN202110756462A CN113523742B CN 113523742 B CN113523742 B CN 113523742B CN 202110756462 A CN202110756462 A CN 202110756462A CN 113523742 B CN113523742 B CN 113523742B
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- 238000010079 rubber tapping Methods 0.000 title claims abstract description 20
- 239000000956 alloy Substances 0.000 claims abstract description 106
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 106
- 238000005219 brazing Methods 0.000 claims abstract description 95
- 239000002184 metal Substances 0.000 claims abstract description 89
- 229910052751 metal Inorganic materials 0.000 claims abstract description 89
- 239000000945 filler Substances 0.000 claims abstract description 57
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000012545 processing Methods 0.000 claims abstract description 13
- 238000005553 drilling Methods 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 14
- 238000003466 welding Methods 0.000 claims description 14
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- 230000008018 melting Effects 0.000 claims description 13
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- 239000010959 steel Substances 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 8
- 239000002893 slag Substances 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 229910000943 NiAl Inorganic materials 0.000 claims description 5
- -1 NiAl compound Chemical class 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 5
- 238000003754 machining Methods 0.000 claims description 5
- 230000000956 myotropic effect Effects 0.000 claims description 5
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 2
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
Abstract
The invention discloses a manufacturing method of a T-shaped wear-resistant layer drill bit for blast furnace tapping, which comprises the steps of 1) processing a metal drill body, 2) processing an alloy drill block, 3) preprocessing before brazing, 4) heat treatment of a wear-resistant layer and the like. The invention increases the service life and the use effect of the drill bit by self-making the T-shaped hard alloy drill block and the high-melting-point brazing filler metal, and can effectively solve the problem that the blow-in drill bit in the prior art is easy to fall off at 800-1000 ℃.
Description
Technical Field
The invention relates to the field of blast furnace drill bits, in particular to a manufacturing method of a T-shaped wear-resistant layer drill bit for blast furnace tapping.
Background
In the steel-making process of a steel mill, raw materials such as iron ore are added into a hearth of a blast furnace, the hearth is of a concrete structure and is heated to above 2000 ℃, and the iron ore is changed into molten steel. And (3) punching the lower end of the furnace cavity by using a hydraulic taphole drilling machine, discharging molten iron and then sealing the taphole by using stemming. And then, continuously adding raw materials such as iron ore into the hearth, heating, penetrating through the furnace wall, and repeatedly operating, wherein one hour of molten steel is normally formed. Taking a furnace wall with the thickness of 3.8mm as an example, the temperature of stemming in a taphole channel is continuously increased from outside to inside, the temperature is basically linearly distributed, and the temperatures of the stemming bubbles at the positions with the depths of 1.2m, 2.2m, 2.6m and 2.8m of the taphole channel are respectively 200 ℃, 400 ℃, 800 ℃ and 1200 ℃. When the temperature of the drill bit reaches 1200 ℃, the whole drill bit is completely red and transparent, the drill bit fails and cannot work, the drill bit is retreated, a quenched hexagonal solid drill rod (No. 45 steel quenching) is replaced, the last layer is punched through to discharge molten steel, and therefore, one blow-in drill bit can be used only once and is scrapped.
At present, a blast furnace drill bit is used in molten iron discharged from a high-temperature furnace wall of a steel mill, the blast furnace drill bit is mostly a cross-shaped inserted tooth drill bit and mainly composed of inserted teeth YG8, the YGB comprises 92% WC and 8% Co, and the blast furnace drill bit of the type has the following problems:
1. one connection is made by using 506 welding rod, CO, when the cross-shaped insert bit is inserted into the YG8 insert2In the gas shielded welding, because the welding temperature is too high, the alloy is decarburized and oxidized to form capillary cracks, so that the alloy is broken into pieces and fragments in the using process to fail, and the required hardness cannot be achieved. Or the YG8 alloy is welded on the drill bit by adopting brass soldering paste and high-frequency or medium-frequency heating, because the high-frequency and medium-frequency heating time is short and the heating is uneven, the temperature of the outer ring reaches the melting point of the solder, but the temperature of the inner ring does not reach, so that insufficient welding or slag clamping is generated, the welding is not firm, and the chip is easy to fall off.
2. When the YG8 cross-shaped insert bit is used for inserting the insert, another connection mode adopts the embedding, and the alloy is pressed into the hole by utilizing the interference fit of the spherical tooth alloy and the hole. The alloy is used under the working conditions of normal temperature or low temperature, the effect is better, and the alloy is not damaged. However, when the drill bit is used for opening a blast furnace, once the temperature reaches about 800 ℃, holes on the drill bit expand with heat and contract with cold, and naturally expand, so that the alloy falls off and fails. The wall thickness of the blast furnace in the steel mill is generally more than 2m-2.8m, and the highest temperature can reach 1200 ℃. The button carbide bit was only able to hit at 800 c because the braze had a melting point of only about 800 c, and when the bit hit this temperature the braze melted and the YG8 came off.
The blow-in drill bit in the prior art can only be drilled to 800 ℃, so that a new blow-in drill bit product needs to be developed, the blow-in drill bit product can be drilled to a position above 800 ℃, and the hard alloy blocks cannot fall off in a use environment above 800 ℃, even reach a use temperature above 1000 ℃.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the defects and defects of the prior art, the invention provides a manufacturing method of a blast furnace tapping T-shaped wear-resistant layer drill bit, which prolongs the service life and the use effect of the drill bit by self-manufacturing a T-shaped hard alloy drill block and self-manufacturing a high-melting-point brazing filler metal, and can effectively solve the problem that the hard alloy block is easy to fall off when the blast furnace tapping drill bit in the prior art is at 800-1000 ℃.
The technical scheme is as follows: the invention relates to a manufacturing method of a T-shaped wear-resistant layer drill bit for blast furnace tapping, which comprises the following steps:
1) processing a metal drill body: respectively processing T-shaped groove bodies on 4 tooth bodies at the top of the drill body;
2) processing an alloy drill block: the alloy block raw materials comprise the following components in percentage by mass: 90% WC, 7% Co, 1.3% Ni, 1.1% Cr, 0.6% AI, Ni-Al-Cr-Co solid solution and NiAl compound in the alloy block structure, and processing into T-shaped hard alloy drill block by pressing and sintering;
3) pretreatment before brazing: removing rust and water and oil stains on the inner surface of the T-shaped groove body by adopting ultrasonic cleaning, and removing oxide skin on the surface of the T-shaped hard alloy drill block by adopting grinding machine finishing; the T-shaped hard alloy drill block is embedded with the T-shaped groove body, and the gap between the T-shaped hard alloy drill block and the T-shaped groove body is 0.02mm-0.03 mm;
4) heat treatment of the wear-resistant layer: the adopted brazing filler metal comprises the following components in percentage by mass: and (3) coating brazing filler metal above a connecting gap between a T-shaped hard alloy drill block and a T-shaped groove body by using 92% of Cu, 4% of Ni, 3% of Pd and 1% of Cr, putting the drill body into a vacuum brazing furnace, and performing heat treatment to complete the welding of a brazed wear-resistant layer, thereby obtaining a T-shaped wear-resistant layer drill bit product.
The high-temperature vacuum brazing method for brazing the wear-resistant layer comprises the following steps:
1) smearing brazing filler metal above a connecting gap between a T-shaped hard alloy drill block and a T-shaped groove body, wherein the height of the brazing filler metal is 0.8mm-1.2 mm;
2) vertically placing the drill body coated with the brazing filler metal into a vacuum brazing furnace; pumping the hearth to a vacuum state, and filling nitrogen to prevent the alloy from being oxidized at high temperature, wherein the melting point of the brazing filler metal is 1083 ℃;
3) heating the vacuum brazing furnace to 1100 ℃, keeping the temperature for more than 40min, uniformly melting the brazing filler metal to generate a myotropic effect, drilling into a connecting gap, and filling the gap with the brazing filler metal to connect the T-shaped hard alloy drill block and the T-shaped groove body;
4) after the furnace is slowly cooled to normal temperature, nitrogen is filled in the furnace to punch and open the hearth to complete welding.
The drilling body is of a hollow cylindrical structure, 4 tooth bodies are arranged at the top of the drilling body, a top through hole penetrating through the drilling body is formed between the 4 tooth bodies, a slag discharge port of an inwards concave structure is formed between the side parts of the tooth bodies, and the slag discharge port is provided with or is not provided with a side through hole communicated with the top through hole; the top of the tooth body is provided with a T-shaped groove body, a T-shaped hard alloy drill block is arranged in the T-shaped groove body, the T-shaped hard alloy drill block is embedded with the T-shaped groove body, a brazing wear-resistant layer is arranged between the T-shaped hard alloy drill block and the T-shaped groove body, and the gap between the T-shaped hard alloy drill block and the T-shaped groove body is 0.02mm-0.03 mm; the T-shaped hard alloy drill block comprises a metal drill tip, a metal drill base and a metal drill bottom which are sequentially connected from top to bottom, wherein the metal drill base and the metal drill bottom are positioned in the T-shaped groove body, and the metal drill tip is positioned above the T-shaped groove body.
The drill body is made of No. 45 steel, the machining clearance precision of 7 contact surfaces of the T-shaped groove body and the T-shaped hard alloy drill block is 0.02-0.03 mm, and the T-shaped groove body is used for connecting the T-shaped hard alloy drill block and the T-shaped groove body through vacuum high-temperature filling brazing filler metal.
Wherein the vertical section of the metal drill point is in the shape of an isosceles triangle, and the included angle between the inclined plane of the metal drill point and the horizontal plane is 30-60 degrees.
Has the beneficial effects that: compared with the prior art, the invention has the following remarkable advantages: the invention increases the service life and the use effect of the drill bit by self-making the T-shaped hard alloy drill block and the high-melting-point brazing filler metal, solves the problem of drilling and mining of the stemming at 1000 ℃, can effectively solve the problem that the hard alloy block of the blow-in drill bit in the prior art is easy to fall off at 800-1000 ℃, and provides a brand new thought and material, namely the blast furnace iron-tapping T-shaped wear-resistant layer drill bit and the manufacturing process thereof. The method can directly drill to the position of more than 2.6m, so that the brazing filler metal has stable strength at 1000 ℃, the alloy blocks cannot fall off due to the influence of the T-shaped structure, and the defects of the prior art are effectively overcome, thereby achieving the ideal effect.
Drawings
FIG. 1 is a schematic diagram of the construction of a drill body of the present invention;
FIG. 2 is a schematic cross-sectional view of the drill body of the present invention;
FIG. 3 is a schematic structural view of a T-shaped cemented carbide button of the drill body of the present invention;
in the figure, 1 is a drill body, 2 is a tooth body, 3 is a brazing wear-resistant layer, 4 is a T-shaped hard alloy drill block, 5 is a slag discharge port, 6 is a side through hole, 7 is a top through hole, 8 is a metal drill tip, 9 is a metal drill base and 10 is a metal drill bottom.
Detailed Description
The technical solution of the present invention is further described with reference to the accompanying drawings and the detailed description.
The invention relates to a manufacturing method of a T-shaped wear-resistant layer drill bit for blast furnace tapping, which comprises the following steps:
1) processing a metal drill body: t-shaped groove bodies are respectively processed on 4 tooth bodies 2 at the top of the drill body 1.
2) Processing an alloy drill block: the alloy block raw materials comprise the following components in percentage by mass: 90% WC, 7% Co, 1.3% Ni, 1.1% Cr, 0.6% AI, Ni-Al-Cr-Co solid solution and NiAl compound in the alloy block structure, and pressing and sintering to obtain the T-shaped hard alloy drill block 4.
3) Pretreatment before brazing: removing rust and water and oil stains on the inner surface of the T-shaped groove body by adopting ultrasonic cleaning, and removing oxide skin on the surface of the T-shaped hard alloy drill block 4 by adopting grinding machine finishing; the T-shaped hard alloy drill block 4 is embedded with the T-shaped groove body, and the gap between the T-shaped hard alloy drill block 4 and the T-shaped groove body is 0.02mm-0.03 mm.
4) Heat treatment of the wear-resistant layer: the adopted brazing filler metal comprises the following components in percentage by mass: and (3) coating brazing filler metal above a connecting gap between a T-shaped hard alloy drill block 4 and a T-shaped groove body by using 92% of Cu, 4% of Ni, 3% of Pd and 1% of Cr, and placing the drill body 1 into a vacuum brazing furnace for heat treatment to complete the welding of the brazed wear-resistant layer 3, thereby obtaining a T-shaped wear-resistant layer drill bit product.
The high-temperature vacuum brazing method for brazing the wear-resistant layer 3 comprises the following steps:
1) and (3) coating brazing filler metal above a connecting gap between the T-shaped hard alloy drill block 4 and the T-shaped groove body, wherein the height of the brazing filler metal is 0.8mm-1.2 mm.
2) Vertically placing the drill body 1 coated with the brazing filler metal into a vacuum brazing furnace; the hearth is pumped to a vacuum state, nitrogen is filled to prevent the alloy from being oxidized at high temperature, and the melting point of the brazing filler metal is 1083 ℃.
3) And heating the vacuum brazing furnace to 1100 ℃, keeping the temperature for more than 40min, uniformly melting the brazing filler metal to generate a myotropic effect, drilling into a connecting gap, and filling the gap with the brazing filler metal to connect the T-shaped hard alloy drill block 4 and the T-shaped groove body.
4) After the furnace is slowly cooled to normal temperature, nitrogen is filled in the furnace to punch and open the hearth to complete welding.
The drill body 1 is of a hollow cylindrical structure, 4 tooth bodies 2 are arranged on the top of the drill body 1, top through holes 7 penetrating through the drill body 1 are formed among the 4 tooth bodies 2, slag discharge ports 5 of an inwards concave structure are formed among the side portions of the tooth bodies 2, and the slag discharge ports 5 are provided with or not provided with side through holes 6 communicated with the top through holes 7; a T-shaped groove body is formed in the top of the tooth body 2, a T-shaped hard alloy drilling block 4 is arranged in the T-shaped groove body, the T-shaped hard alloy drilling block 4 is embedded with the T-shaped groove body, a brazing wear-resistant layer 3 is arranged between the T-shaped hard alloy drilling block 4 and the T-shaped groove body, and the gap between the T-shaped hard alloy drilling block 4 and the T-shaped groove body is 0.02mm-0.03 mm; the T-shaped hard alloy drill block 4 comprises a metal drill tip 8, a metal drill base 9 and a metal drill bottom 10 which are sequentially connected from top to bottom, the metal drill base 9 and the metal drill bottom 10 are located in the T-shaped groove body, and the metal drill tip 8 is located above the T-shaped groove body. The drill body 1 is made of No. 45 steel, the machining clearance precision of 7 contact surfaces of the T-shaped groove body and the T-shaped hard alloy drill block 4 is 0.02mm-0.03mm, and the T-shaped groove body is used for connecting the T-shaped hard alloy drill block 4 and the T-shaped groove body through vacuum high-temperature filling brazing filler metal. The vertical section of the metal drill point 8 is in the shape of an isosceles triangle, and the included angle between the inclined plane of the metal drill point 8 and the horizontal plane is 30-60 degrees.
The manufacturing method of the T-shaped wear-resistant layer drill for blast furnace tapping has the following innovation points:
the innovation point is as follows: the precision of the processing clearance of 7 contact surfaces of the T-shaped groove body and the T-shaped hard alloy drill block 4 is 0.02mm-0.03mm, the T-shaped hard alloy drill block 4 and the T-shaped groove body are connected through vacuum high-temperature filling brazing filler metal, the clearance is obtained through a large number of tests of an inventor, and the too large or too small clearance can not reach the bonding strength within the clearance range. The brazing wear-resistant layer 3 completely fills the gap, and the overall strength and wear resistance of the drill body 1 are improved.
The innovation point is two: the alloy block raw material adopted by the T-shaped hard alloy drill block 4 comprises the following components in percentage by mass: 90% WC, 7% Co, 1.3% Ni, 1.1% Cr and 0.6% AI, wherein the alloy block structure is Ni-Al-Cr-Co solid solution and NiAl compound, the alloy block formula is obtained by the inventor through a large amount of experiments, the alloy block is original, the use temperature is about 1100 ℃, the problem of drilling and production of the stemming at 1000 ℃ is solved, the problem that the hard alloy block is easy to fall off in the prior art at 800-1000 ℃ can be effectively solved, and a brand new idea and material are provided.
The innovation points are as follows: the T-shaped hard alloy drill block 4 has a specific structure, the T-shaped groove body and the T-shaped hard alloy drill block 4 are adopted, a contact surface is increased, the brazing wear-resistant layer 3 can be connected with the T-shaped hard alloy drill block 4 and the T-shaped groove body more tightly, and the strength of the drill bit is improved.
The innovation point is four: the brazing filler metal adopted for brazing the wear-resistant layer 3 comprises the following components in percentage by mass: the formula of the brazing filler metal is obtained by a large number of experiments of an inventor, the brazing filler metal is original, the melting point of the brazing filler metal is 1083 ℃, and the open-hearth drill bit product can reach the use temperature of 1000 ℃. Meanwhile, the self-made T-shaped hard alloy drill block 4, the self-made brazing filler metal and the machining clearance precision are matched, so that the high temperature resistance, the strength and the wear resistance of the whole drill body 1 are improved.
The innovation point is five: the original high-temperature vacuum brazing method for brazing the wear-resistant layer 3 is characterized in that a drill body 1 coated with brazing filler metal is vertically placed in a vacuum brazing furnace; pumping the hearth to a vacuum state, and filling nitrogen to prevent the alloy from being oxidized at high temperature; and heating the vacuum brazing furnace to 1100 ℃ and preserving the temperature for more than 40min, uniformly melting the brazing filler metal to generate a myotropic effect and drilling the myotropic effect into a connecting gap, and filling the gap with the brazing filler metal to connect the T-shaped hard alloy drill block 4 and the T-shaped groove body to form a brazed wear-resistant layer 3. The brazing wear-resistant layer 3 uniformly penetrates into a gap between the T-shaped hard alloy drill block 4 and the T-shaped groove body, and the connection strength is improved.
According to the manufacturing method of the T-shaped wear-resistant layer drill bit for blast furnace tapping, the service life and the use effect of the drill bit are prolonged through the self-made T-shaped hard alloy drill block 4 and the self-made high-melting-point brazing filler metal, the problem of drilling and mining of stemming at 1000 ℃ is solved, the problem that the hard alloy block of the blast furnace drill bit in the prior art is easy to fall off at 800-1000 ℃ can be effectively solved, and a brand new thought and material are provided, namely the T-shaped wear-resistant layer drill bit for blast furnace tapping and the manufacturing process thereof. The method can directly drill to the position of more than 2.6m, so that the brazing filler metal has stable strength at 1000 ℃, the alloy block cannot fall off due to the influence of the T-shaped structure, and the defects of the prior art are effectively overcome, thereby achieving the ideal effect.
Example (b):
in order to increase the tapping efficiency of a steel mill and reduce the cost of tapping 6-angle drill rods, a T-shaped wear-resistant layer drill bit for tapping a blast furnace is manufactured. The drill bit is required to drill and exploit the stemming to a position of 2.6m, the temperature can reach 1000 ℃, and the drill bit can be reused without damage after drilling and exploitation.
The manufacturing method of the T-shaped wear-resistant layer drill for blast furnace tapping comprises the following steps:
1) processing a metal drill body: t-shaped groove bodies are respectively processed on 4 tooth bodies 2 at the top of the drill body 1. 4 tooth bodies 2 are symmetrically distributed on the top of the drill body 1 in a cross shape, and 3 wires, namely 0.02mm-0.03mm, are reserved between the machining size of the T-shaped groove body and the assembly gap of the hard alloy block in order to ensure the reliability of the subsequent contact and brazing process with the T-shaped hard alloy drill block 4.
2) Processing an alloy drill block: the alloy block raw materials comprise the following components in percentage by mass: 90% WC, 7% Co, 1.3% Ni, 1.1% Cr, 0.6% AI, Ni-Al-Cr-Co solid solution and NiAl compound in the alloy block structure, and the T-shaped hard alloy drill block 4 is processed by pressing and sintering. The traditional YG8 alloy block material comprises 92% WC and 8% Co, and when the hardness is too high, the disintegrating block fails, and compared with the traditional YG8 alloy block raw material, the toughness of the self-developed alloy block is increased, and the use temperature can reach 1100 ℃.
3) Pretreatment before brazing: the rust and water and oil stains on the inner surface of the T-shaped groove body are removed by ultrasonic cleaning, and the rust and oil stains in the corners of the T-shaped groove body can be effectively removed by ultrasonic cleaning; after cleaning, acetone is used for scrubbing the surface to remove the residual water after the ultrasonic wave. And removing oxide skin on the surface of the T-shaped hard alloy drill block 4 by adopting grinding machine finishing so as to ensure that the combined part cannot be affected by the oxide to cause falling and poor welding during combination. The T-shaped hard alloy drill block 4 is embedded with the T-shaped groove body, and the gap between the T-shaped hard alloy drill block 4 and the T-shaped groove body is 0.02mm-0.03 mm.
4) Heat treatment of the wear-resistant layer: the adopted brazing filler metal comprises the following components in percentage by mass: the brazing filler metal is different from the traditional brass brazing filler metal, the traditional brazing filler metal is composed of copper and zinc, the liquidus temperature is less than 800 ℃, and the melting point of the brazing filler metal which is self-made at this time is 1083 ℃. And (3) coating brazing filler metal above a connecting gap between the T-shaped hard alloy drill block 4 and the T-shaped groove body, and putting the drill body 1 into a vacuum brazing furnace for heat treatment to complete the welding of the brazed wear-resistant layer 3, so as to obtain a T-shaped wear-resistant layer drill bit product.
The high-temperature vacuum brazing method for brazing the wear-resistant layer 3 of the embodiment comprises the following steps:
1) and (3) coating brazing filler metal above a connecting gap between the T-shaped hard alloy drill block 4 and the T-shaped groove body, wherein the height of the brazing filler metal is 0.8mm-1.2 mm.
2) The drill body 1 coated with the brazing filler metal is vertically placed into a vacuum brazing furnace, so that the surface of a drill bit is horizontally upward, and the brazing filler metal cannot run randomly at high temperature and uniformly flows in gaps among 3 wires. The hearth is pumped to a vacuum state, nitrogen is filled to prevent the alloy from being oxidized at high temperature, and the melting point of the brazing filler metal is 1083 ℃.
3) And heating the vacuum brazing furnace to 1100 ℃ and preserving the temperature for more than 40min, uniformly melting the brazing filler metal to generate a muscle-philic effect and drilling the brazing filler metal into a connecting gap, and filling the gap with the brazing filler metal to connect the T-shaped hard alloy drill block 4 and the T-shaped groove body.
4) After the furnace is slowly cooled to normal temperature, nitrogen is filled in the furnace to punch and open the hearth to complete welding.
The drill bit manufactured by the method of the embodiment has the beneficial effects that through cooperative development and testing with the steel, compared with the traditional drill bit, the drill bit manufactured by the method of the embodiment effectively solves the drilling and production problem of the stemming at 1000 ℃, the drilling and production efficiency is high, the service life of the hard alloy block which is not easy to collapse is prolonged, the tapping efficiency is increased, and the drill bit can be repeatedly used.
Claims (3)
1. A manufacturing method of a T-shaped wear-resistant layer drill bit for blast furnace tapping is characterized by comprising the following steps: the method comprises the following steps:
1) processing a metal drill body: t-shaped groove bodies are respectively processed on 4 tooth bodies (2) at the top of the drill body (1);
2) processing an alloy drill block: the adopted alloy block raw materials comprise the following components in percentage by mass: 90% WC, 7% Co, 1.3% Ni, 1.1% Cr, 0.6% AI, Ni-Al-Cr-Co solid solution and NiAl compound in the alloy block structure, and pressing and sintering to form T-shaped hard alloy drill block (4);
3) pretreatment before brazing: removing rust and water and oil stains on the inner surface of the T-shaped groove body by adopting ultrasonic cleaning, and removing oxide skin on the surface of the T-shaped hard alloy drill block (4) by adopting grinding machine finishing; the T-shaped hard alloy drill block (4) is embedded with the T-shaped groove body, and the gap between the T-shaped hard alloy drill block (4) and the T-shaped groove body is 0.02mm-0.03 mm;
4) heat treatment of the wear-resistant layer: the adopted brazing filler metal comprises the following components in percentage by mass: coating brazing filler metal above a connecting gap between a T-shaped hard alloy drill block (4) and a T-shaped groove body, and placing a drill body (1) into a vacuum brazing furnace for heat treatment to complete the welding of a brazed wear-resistant layer (3) to obtain a T-shaped wear-resistant layer drill bit product;
the high-temperature vacuum brazing method for brazing the wear-resistant layer (3) comprises the following steps:
1) coating brazing filler metal above a connecting gap between the T-shaped hard alloy drill block (4) and the T-shaped groove body, wherein the height of the brazing filler metal is 0.8mm-1.2 mm;
2) vertically placing the drill body (1) coated with the brazing filler metal into a vacuum brazing furnace; pumping the hearth to a vacuum state, and filling nitrogen to prevent the alloy from being oxidized at high temperature, wherein the melting point of the brazing filler metal is 1083 ℃;
3) heating the vacuum brazing furnace to 1100 ℃ and preserving the temperature for more than 40min, uniformly melting the brazing filler metal to generate a myotropic effect and drilling the brazing filler metal into a connecting gap, and filling the gap with the brazing filler metal to connect the T-shaped hard alloy drill block (4) and the T-shaped groove body;
4) after the furnace is slowly cooled to normal temperature, nitrogen is filled in the furnace to punch and open the hearth to complete welding;
the drill body (1) is of a hollow cylindrical structure, 4 tooth bodies (2) are arranged at the top of the drill body (1), top through holes (7) penetrating through the drill body (1) are formed among the 4 tooth bodies (2), a slag discharge port (5) of an inwards concave structure is formed among the side portions of the tooth bodies (2), and the slag discharge port (5) is provided with or not provided with a side through hole (6) communicated with the top through hole (7); the top of the tooth body (2) is provided with a T-shaped groove body, a T-shaped hard alloy drill block (4) is arranged in the T-shaped groove body, the T-shaped hard alloy drill block (4) is embedded with the T-shaped groove body, a brazing wear-resistant layer (3) is arranged between the T-shaped hard alloy drill block (4) and the T-shaped groove body, and the gap between the T-shaped hard alloy drill block (4) and the T-shaped groove body is 0.02mm-0.03 mm; the T-shaped hard alloy drill block (4) comprises a metal drill tip (8), a metal drill base (9) and a metal drill bottom (10) which are sequentially connected from top to bottom, the metal drill base (9) and the metal drill bottom (10) are located in a T-shaped groove body, and the metal drill tip (8) is located above the T-shaped groove body.
2. The method for manufacturing the T-shaped wear-resistant layer drill bit for blast furnace tapping according to claim 1, characterized in that: the drill body (1) is made of No. 45 steel, the machining clearance precision of 7 contact surfaces of the T-shaped groove body and the T-shaped hard alloy drill block (4) is 0.02mm-0.03mm, and the T-shaped hard alloy drill block is used for connecting the T-shaped hard alloy drill block (4) and the T-shaped groove body through vacuum high-temperature filling brazing filler metal.
3. The method for manufacturing the T-shaped wear-resistant layer drill bit for blast furnace tapping according to claim 1, characterized in that: the vertical section of the metal drill point (8) is in the shape of an isosceles triangle, and the included angle between the inclined plane of the metal drill point (8) and the horizontal plane is 30-60 degrees.
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| CN200978289Y (en) * | 2006-12-11 | 2007-11-21 | 兰素英 | Hard alloy knife drill bit for blast furnace tapping |
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| CN101698266B (en) * | 2009-11-06 | 2011-09-28 | 株洲开拓工具有限公司 | Method for manufacturing blast furnace hole bit |
| CN201801530U (en) * | 2010-09-20 | 2011-04-20 | 株洲金鼎硬质合金有限公司 | Hard alloy cross brazing sheet for tapping drill of blast furnace |
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| CN1704481A (en) * | 2004-05-28 | 2005-12-07 | 宝山钢铁股份有限公司 | Drill bit for taphole of blast furnace and method for producing same |
| CN2846704Y (en) * | 2005-10-17 | 2006-12-13 | 兰文卿 | Novel hard alloy drill bit |
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Denomination of invention: A manufacturing method for T-shaped wear-resistant layer drill bits for blast furnace tapping Granted publication date: 20220715 Pledgee: Guilin Branch of Bank of Guilin Co.,Ltd. Pledgor: Guilin zhongruite Machinery Manufacturing Co.,Ltd. Registration number: Y2024980007760 |
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