CN112981306B - High-wind-pressure down-the-hole drill bit and preparation method thereof - Google Patents
High-wind-pressure down-the-hole drill bit and preparation method thereof Download PDFInfo
- Publication number
- CN112981306B CN112981306B CN202110183354.4A CN202110183354A CN112981306B CN 112981306 B CN112981306 B CN 112981306B CN 202110183354 A CN202110183354 A CN 202110183354A CN 112981306 B CN112981306 B CN 112981306B
- Authority
- CN
- China
- Prior art keywords
- hole drill
- cooling
- temperature
- preparation
- hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/58—Oils
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/22—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for drills; for milling cutters; for machine cutting tools
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Articles (AREA)
- Drilling And Boring (AREA)
Abstract
The invention relates to the technical field of drill tool production, in particular to a high-wind-pressure down-the-hole drill tool drill bit and a preparation method thereof. The preparation method comprises the following steps: A) machining the steel billet to obtain a down-the-hole drill trouser body; B) carburizing the down-the-hole trousers body, and cooling; C) normalizing the cooled down-the-hole trousers body; D) heating the normalized down-the-hole drill pants body to 855-865 ℃, preserving heat, performing primary vacuum oil quenching, cooling, then heating to 675-685 ℃, preserving heat, performing secondary vacuum oil quenching, and cooling; E) d), carrying out deep cooling treatment on the down-hole drilling trousers body obtained in the step D), and air cooling to room temperature; F) tempering the down-the-hole drill pants obtained in the step E) at a low temperature; G) and D) embedding hard alloy spherical teeth on the down-the-hole drill trousers obtained in the step F), and then performing shot blasting treatment to obtain the high-air-pressure down-the-hole drill bit. The invention adopts secondary vacuum oil quenching and other heat treatment processes to prepare the high-wind-pressure down-the-hole drill bit with better performance.
Description
Technical Field
The invention relates to the technical field of drill tool production, in particular to a high-wind-pressure down-the-hole drill tool drill bit and a preparation method thereof.
Background
The high wind pressure down-the-hole drill bit has important application in the fields of mining, well drilling, tunnels and the like, wherein the heat treatment process is closely related to the use performance of the drill bit.
At present, 23CrNi3Mo is the main steel used for down-the-hole drill tools, and is traditionally processed by an isothermal quenching process as a heat treatment process. Chinese patent CN102703911A discloses a heat treatment method for a down-the-hole drill bit of a high-wind-pressure drilling tool and the drill bit, wherein an isothermal quenching process is used, and the process has the advantages of high environmental protection threshold, serious pollution, complex working procedures and high production cost. Chinese patent CN107245690N discloses a carburizing and quenching process, in which the surface of a workpiece is easily oxidized during the severe change of high-temperature quenching, which causes damage to the surface carburized layer, and the damaged part is easily a fracture source of the workpiece, directly affecting the service life thereof. Chinese patent CN110129526A discloses a method for preparing a high wind pressure diamond down-the-hole drill steel body, which needs to perform one oil quenching before carburizing, and also needs to perform one oil quenching before cryogenic treatment, wherein the two oil quenching have different effects, and the two oil quenching processes are complex, the production cost is relatively high, the first oil quenching can cause the machining difficulty of the workpiece, meanwhile, the second oil quenching can cause the damage of the surface carburized layer, the quenching effect is not sufficient, and the service life of the workpiece is directly influenced.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a high wind pressure down-the-hole drill bit and a preparation method thereof.
The invention provides a preparation method of a drill bit of a high-wind-pressure down-the-hole drill tool, which comprises the following steps:
A) machining the steel billet to obtain a down-the-hole drill trouser body;
B) carburizing the down-the-hole drill pants body, and cooling;
C) normalizing the down-the-hole drill pants cooled in the step B);
D) heating the normalized down-the-hole drill pants body to 855-865 ℃, preserving heat, performing primary vacuum oil quenching, cooling, heating to 675-685 ℃, preserving heat, performing secondary vacuum oil quenching, and cooling;
E) d), carrying out deep cooling treatment on the down-hole drilling trousers body obtained in the step D), and then air cooling to room temperature;
F) tempering the down-the-hole drill pants obtained in the step E) at a low temperature;
G) and D) embedding hard alloy spherical teeth on the down-the-hole drill pants obtained in the step F), and then carrying out shot blasting treatment to obtain the high-air-pressure down-the-hole drill bit.
Preferably, in the step a), the material of the billet is 23CrNi3Mo steel;
the steel billet is prepared according to the following method:
After hot forging, normalizing at 855-865 ℃, and then tempering at 615-625 ℃ to obtain a steel billet.
Preferably, in the step B), the temperature of the carburizing treatment is 915-925 ℃ and the time is 6-7 h;
the surface carbon concentration of the carburized down-the-hole drill pants body is 0.7-1.3%;
the temperature after cooling is 40-60 ℃.
Preferably, in the step C), the heating temperature in the normalizing is 905-915 ℃, and the heating time is 2-3 h.
Preferably, in the step D), after the normalized down-the-hole drill pants body is heated to 855-865 ℃, the heat preservation time is 1.5-2.5 hours;
then heating to 675-685 ℃, and keeping the temperature for 0.5-1.5 h.
Preferably, in the step D), the temperature of the primary vacuum oil quenching is 60-75 ℃, and the time is 0.5-1 h;
the vacuum degree of the primary vacuum oil quenching is less than 10 -2 Pa；
Carrying out primary vacuum oil quenching, cooling, and cleaning.
Preferably, in the step D), the temperature of the secondary vacuum oil quenching is 60-65 ℃, and the time is 0.5-1 h;
the vacuum degree of the secondary vacuum oil quenching is less than 10 -2 Pa；
And performing secondary vacuum oil quenching, cooling, and then cleaning and drying.
Preferably, in the step E), the temperature of the cryogenic treatment is-85 to-70 ℃, and the time is 1.5 to 2.5 hours.
Preferably, in the step F), the temperature of the low-temperature tempering is 215-225 ℃, and the time is 5.5-6.5 h.
The invention also provides the drill bit of the high-wind-pressure down-the-hole drill tool prepared by the preparation method.
The invention provides a preparation method of a drill bit of a high-wind-pressure down-the-hole drill tool, which comprises the following steps: A) machining the steel billet to obtain a down-the-hole drill trouser body; B) carburizing the down-the-hole drill pants body, and cooling; C) normalizing the down-the-hole drill pants cooled in the step B); D) heating the normalized down-the-hole drill pants body to 855-865 ℃, preserving heat, performing primary vacuum oil quenching, cooling, heating to 675-685 ℃, preserving heat, performing secondary vacuum oil quenching, and cooling; E) d), carrying out deep cooling treatment on the down-hole drilling trousers body obtained in the step D), and then air cooling to room temperature; F) tempering the down-the-hole drill pants obtained in the step E) at low temperature; G) and D) embedding hard alloy spherical teeth on the down-the-hole drill pants obtained in the step F), and then carrying out shot blasting treatment to obtain the high-air-pressure down-the-hole drill bit. The invention adopts the secondary vacuum oil quenching process and other heat treatment processes to finally obtain the high-air-pressure down-the-hole drill bit with high surface hardness, high wear resistance, good core toughness and long service life. In addition, the preparation method of the high-wind-pressure down-the-hole drill bit provided by the invention has the advantages of simple process, low production cost and small environmental pollution.
Drawings
FIG. 1 is a metallographic picture of a down-the-hole drill pant body after cryogenic treatment according to example 1 of the present invention;
FIG. 2 is the hardness distribution curve from outside to inside of the downhole drill pants after the low temperature tempering according to example 1 of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a preparation method of a drill bit of a high-wind-pressure down-the-hole drill tool, which comprises the following steps of:
A) machining the steel billet to obtain a down-the-hole drill trouser body;
B) carburizing the down-the-hole drill pants body, and cooling;
C) normalizing the down-the-hole drill pants cooled in the step B);
D) heating the normalized down-the-hole drill pants body to 855-865 ℃, preserving heat, performing primary vacuum oil quenching, cooling, heating to 675-685 ℃, preserving heat, performing secondary vacuum oil quenching, and cooling;
E) d), carrying out deep cooling treatment on the down-hole drilling trousers body obtained in the step D), and then air cooling to room temperature;
F) Tempering the down-the-hole drill pants obtained in the step E) at a low temperature;
G) and D) embedding hard alloy spherical teeth on the down-the-hole drill pants obtained in the step F), and then carrying out shot blasting treatment to obtain the high-air-pressure down-the-hole drill bit.
The invention firstly carries out machining on a steel billet to obtain the down-the-hole drill trouser body.
In some embodiments of the present invention, the material of the steel billet is 23CrNi3Mo steel.
In certain embodiments of the present invention, the steel slab is prepared according to the following method:
after hot forging, normalizing at 855-865 ℃, and then tempering at 615-625 ℃ to obtain a steel billet.
In certain embodiments of the invention, the steel material is 23CrNi3Mo steel.
The method and parameters of the hot forging are not particularly limited in the present invention, and those of the hot forging known to those skilled in the art may be used.
In certain embodiments of the invention, the normalizing treatment temperature is 860 ℃. In some embodiments of the invention, the normalizing treatment time is 4-5 h. In certain embodiments, the normalizing treatment time is 4.5 hours.
In certain embodiments of the present invention, the heating temperature in the high temperature tempering treatment is 620 ℃. In some embodiments of the present invention, the heating time in the high temperature tempering treatment is 3 to 4.5 hours. In certain embodiments, the heating time in the high temperature tempering treatment is 4 h.
In some embodiments of the invention, after the high-temperature tempering treatment, the steel is cooled to 40-60 ℃ along with the furnace, and then is discharged from the furnace and naturally cooled in the air. In some embodiments, after the high temperature tempering treatment, the steel is furnace cooled to 50 ℃.
The machining is used for machining the billet into the shape of the down-the-hole drill product, and the method and parameters of the machining are not particularly limited by the invention, and the method and parameters of the machining are well known to those skilled in the art.
And (3) after obtaining the down-the-hole drilling trouser body, carrying out carburizing treatment on the down-the-hole drilling trouser body, and cooling.
In some embodiments of the invention, the temperature of the carburizing treatment is 915-925 ℃ and the time is 6-7 h. In certain embodiments, the temperature of the carburizing process is 920 ℃. In certain embodiments, the time of the carburizing treatment is 6.5 hours. In certain embodiments of the invention, the carburizing process is performed in a furnace.
In some embodiments of the invention, the carbon concentration of the surface of the carburized down-the-hole drill pants body is 0.7-1.3%. In certain embodiments, the carburized down-the-hole drill pant body has a surface carbon concentration of 1.2%.
In some embodiments of the present invention, the temperature after cooling is 40 to 60 ℃. In certain embodiments, the cooled temperature is 50 ℃. In certain embodiments of the invention, the cooling is: naturally cooling in air. And discharging the product after cooling.
In the invention, the carburization treatment can ensure that the surface of the workpiece has higher hardness and wear resistance, and the core has higher toughness.
Normalizing the cooled down-the-hole drilled trousers body.
In some embodiments of the invention, the temperature for heating in the normalizing is 905-915 ℃ and the heating time is 2-3 h. In certain embodiments, the temperature of the heating in the normalizing is 910 ℃. In certain embodiments, the time of heating in the normalization is 2.5 h. In certain embodiments of the invention, the normalizing is performed in a furnace.
In the invention, the normalizing can refine the crystal grains of the workpiece structure and homogenize the carbide distribution, thereby improving the performance.
And after normalizing, heating the normalized down-the-hole drill pants to 855-865 ℃, preserving heat, performing primary vacuum oil quenching, cooling, heating to 675-685 ℃, preserving heat, performing secondary vacuum oil quenching, and cooling.
In some embodiments of the invention, after the normalized down-the-hole drill pants body is heated to 855-865 ℃, the heat preservation time is 1.5-2.5 hours. In certain embodiments, the normalized down-the-hole drill pant is heated to 860 ℃. In some embodiments, the incubation time is 2 hours.
In some embodiments of the invention, the temperature of the primary vacuum oil quenching is 60-75 ℃ and the time is 0.5-1 h. In certain embodiments, the temperature of the primary vacuum oil quench is 65 ℃. In some embodiments, the time for one vacuum oil quench is 0.8 h.
In some embodiments of the invention, the vacuum degree of the primary vacuum oil quenching is less than 10 -2 Pa. In some embodiments, the vacuum degree of the primary vacuum oil quenching is 9.5X 10 -3 Pa。
In certain embodiments of the present invention, the primary vacuum oil quench is performed in a vacuum oil quench furnace.
In certain embodiments of the invention, after a vacuum oil quench, the mixture is cooled to room temperature. In some embodiments of the invention, a vacuum oil quench is performed, followed by cooling and cleaning. After the primary vacuum oil quenching is finished, cooling to room temperature, and then taking out and cleaning. The method of cleaning is not particularly limited in the present invention, and a cleaning method known to those skilled in the art may be used.
In some embodiments of the present invention, the holding time is 0.5-1.5 hours after the reheating to 675-685 ℃. In certain embodiments, reheated to 680 ℃. In certain embodiments, the incubation time is 1 h.
In some embodiments of the invention, the temperature of the secondary vacuum oil quenching is 60-65 ℃ and the time is 0.5-1 h. In certain embodiments, the temperature of the secondary vacuum oil quench is 62 ℃. In some embodiments, the time for the second vacuum oil quench is 0.7 hours.
In some embodiments of the invention, the vacuum degree of the secondary vacuum oil quenching is less than 10 -2 Pa. In some embodiments, the vacuum degree of the secondary vacuum oil quenching is 9.5X 10 -3 Pa。
In certain embodiments of the present invention, the secondary vacuum oil quenching is performed in a vacuum oil quench furnace.
In some embodiments of the invention, after the second vacuum oil quench, the mixture is cooled to room temperature. In some embodiments of the present invention, the second vacuum oil quenching is performed, and after cooling, the cleaning and drying are further included. And after the secondary vacuum oil quenching is finished, cooling to room temperature, taking out, cleaning and drying. The method of cleaning is not particularly limited in the present invention, and a cleaning method known to those skilled in the art may be used. The method of drying is not particularly limited in the present invention, and a drying method known to those skilled in the art may be used.
According to the invention, the martensite structure change is adopted in the oil quenching process, the strong hardness and the wear resistance of steel can be improved, the surface of a workpiece can be prevented from being oxidized in the severe change process of high-temperature quenching by adopting a vacuum environment, the damage to a surface carburized layer is reduced, the surface layer of the workpiece can be fully quenched under the action of secondary oil quenching, and higher strong hardness is expressed. In addition, the vacuum oil quenching process is simple, the production cost is low, and the environmental pollution is small.
And then, carrying out deep cooling treatment on the obtained down-the-hole drilling trousers body, and then air cooling to room temperature.
In some embodiments of the invention, the temperature of the cryogenic treatment is-85 to-70 ℃ and the time is 1.5 to 2.5 hours. In certain embodiments, the temperature of the cryogenic treatment is-75 ℃. In certain embodiments, the time for the cryogenic treatment is 2 hours. In certain embodiments of the invention, the cryogenic treatment is performed in a cryogenic furnace.
In the invention, the cryogenic treatment can completely transform the residual austenite in the workpiece structure into martensite, so that the whole structure is more uniform and consistent.
And tempering the down-the-hole drill trousers body cooled to room temperature in air at a low temperature.
In some embodiments of the present invention, the low temperature tempering is performed at 215-225 ℃ for 5.5-6.5 hours. In certain embodiments, the low temperature tempering temperature is 220 ℃. In certain embodiments, the time for the low temperature tempering is 6 hours.
In some embodiments of the present invention, after the low temperature tempering, the method further comprises: and (6) air cooling.
In the invention, the low-temperature tempering can remove the internal stress of the workpiece and improve the structural stability.
And then, embedding hard alloy spherical teeth on the obtained down-the-hole drill trousers, and then carrying out shot blasting treatment to obtain the high-wind-pressure down-the-hole drill bit.
The method and parameters of the damascene process are not particularly limited, and the method and parameters of the damascene process known to those skilled in the art can be used. The method and parameters for the shot blasting are not particularly limited in the present invention, and those well known to those skilled in the art can be used.
After the hard alloy spherical teeth are embedded, the surface micro internal stress of the down-the-hole drill pants body can be removed through shot blasting treatment, so that the surface performance is better.
The oil quenching provided by the invention can prevent the surface of the workpiece from being oxidized in the process of severe change of high-temperature quenching in a vacuum environment, so that the damage to a surface carburized layer is reduced, and the surface performance is better; and (4) carrying out cryogenic treatment subsequently to ensure that residual austenite in the structure of the workpiece is completely converted into martensite and the whole structure is more uniform and consistent.
The preparation method of the high-wind-pressure down-the-hole drill bit provided by the invention has the advantages of simple process, low production cost and small environmental pollution.
The source of the above-mentioned raw materials is not particularly limited in the present invention, and may be generally commercially available.
The invention also provides the drill bit of the high-wind-pressure down-the-hole drill tool prepared by the preparation method.
In order to further illustrate the present invention, the following detailed description of a high wind pressure down-the-hole drill bit and the preparation method thereof provided by the present invention are given with reference to the examples, which should not be construed as limiting the scope of the present invention.
In the embodiment, the hard alloy ball teeth are YT310 grade hard alloy ball teeth of Luo Yang golden room;
the metallographic phase is detected according to the standard: metallographic determination of the microstructure of the hard alloy GB/T3488.1-2014; the vickers hardness distribution was measured according to the standard: vickers hardness test of GB/T4340.1-2009 metal material.
Example 1
1) Preparing a steel billet and machining: hot forging 23CrNi3Mo steel, normalizing at 860 ℃ for 4.5h, tempering at 620 ℃ for 4h, cooling the steel to 50 ℃ along with a furnace, and naturally cooling in the air after discharging the steel out of the furnace to obtain a billet; machining the steel billet to obtain a down-the-hole drill trouser body;
2) carburizing: putting the down-the-hole drill pants body into a heating furnace, and performing carburizing treatment when the down-the-hole drill pants body is heated to 920 ℃, wherein the carburizing treatment time is as follows: 6.5h, surface carbon concentration: 1.2 percent, then placing the down-the-hole drill trousers body in the air to be cooled to 50 ℃ and discharging;
3) normalizing: continuously putting the down-the-hole drill trousers body obtained in the step 2) into a heating furnace, preserving heat for 2.5 hours when the down-the-hole drill trousers body is heated to 910 ℃, then putting the down-the-hole drill trousers body into the air to be cooled to the room temperature, and discharging the down-the-hole drill trousers body out of the furnace;
4) primary and secondary vacuum oil quenching: putting the down-the-hole drill trouser body obtained in the step 3) into a vacuum oil quenching furnace, keeping the temperature for 2h when the temperature is heated to 860 ℃, and keeping the temperature of quenching oil at 65 DEG C Vacuum degree of 9.5X 10 -3 And (4) oil quenching is carried out for 0.8h under Pa, and the steel pipe is taken out and cleaned after being cooled to room temperature. Then putting the oil-quenched down-the-hole drill trouser body into a vacuum oil quenching furnace, preserving the heat for 1h when heating to 680 ℃, keeping the quenching oil temperature at 62 ℃ and the vacuum degree at 9.5 multiplied by 10 -3 Oil quenching is carried out for 0.7h under Pa, and finally the cooled down-the-hole drilling trousers body is taken out for cleaning and drying;
5) deep cooling: putting the secondary vacuum oil-quenched down-hole drill trouser body into a deep cooling furnace for deep cooling treatment, wherein the treatment temperature is as follows: -75 ℃, time: cooling in air to room temperature for 2h, and taking out;
6) low-temperature tempering: putting the deep-frozen down-hole trousers body into the furnace again to heat to 220 ℃, preserving heat for 6 hours, and then taking out and air-cooling;
7) inlaying and shot blasting: and (4) embedding hard alloy spherical teeth on the down-the-hole drill pants obtained in the step 6), and removing the surface micro internal stress through shot blasting treatment to finally obtain the high-air-pressure down-the-hole drill bit.
In this example, the microstructure (i.e., metallographic phase) of the downhole drill body subjected to the cryogenic treatment in step 5) was analyzed, and the result is shown in fig. 1. FIG. 1 is a metallographic picture of a down-the-hole drill body after cryogenic treatment in example 1 of the present invention. In FIG. 1, (a) is a gold phase diagram of the surface layer of the deep-cooled downhole drilling pant in example 1, wherein (b) is a gold phase diagram of the transition layer of the deep-cooled downhole drilling pant in example 1, and (c) is a gold phase diagram of the core matrix of the deep-cooled downhole drilling pant in example 1.
As can be seen from FIG. 1, the surface structure of the workpiece is high-carbon martensite; the structure of the transition layer is high-carbon martensite and hidden-needle martensite; the core matrix structure is cryptoneedle martensite. Therefore, the down-the-hole drill pants body provided by the invention has higher strong hardness and wear resistance.
In this embodiment, the hardness distribution of the downhole drill pants after the low temperature tempering in step 6) from outside to inside is also analyzed, and the result is shown in fig. 2. FIG. 2 is a hardness distribution curve from outside to inside of the downhole drilling trousers body after the low-temperature tempering according to example 1 of the present invention.
As can be seen from FIG. 2, the hardness of the surface layer of the DTV trousers body after low temperature tempering can reach 708Hv, so that the surface layer has higher hardness and wear resistance, the hardness of the core matrix is 493Hv, the function of good toughness is achieved, and the hardness distribution curve presents smooth transition in the transition region, so that the possibility of fracture is greatly reduced.
Comparative example 1
The difference between the comparative example and the example 1 is that the step 4) and the step 5) are replaced by an isothermal quenching process, and the isothermal quenching process specifically comprises the following steps: putting the down-the-hole drill pants obtained in the step 3) into a salt bath furnace for isothermal quenching, wherein the technical requirements of the isothermal quenching are as follows: the temperature in the furnace is 880 ℃, and the quenching time is 25 min; then placed in a nitrate tank and incubated at a temperature of 260 ℃ for 1h, again after following steps 6) and 7) of example 1.
Comparative example 2
The difference between the comparative example and the example 1 is that the secondary vacuum oil quenching process in the step 4) is omitted, and the deep cooling treatment in the step 5) is directly carried out on the down-hole drilling trousers body after the primary vacuum oil quenching.
Comparative example 3
The difference between the comparative example and the example 1 is that the step 5) deep cooling treatment is omitted, and the down-the-hole drill pants body after the secondary vacuum oil quenching in the step 4) is directly subjected to the step 6) low-temperature tempering.
Respectively manufacturing 30 high-wind-pressure down-the-hole drill bits a, b, c and d according to the methods of the embodiment 1, the comparative example 2 and the comparative example 3, testing 30 high-wind-pressure down-the-hole drill bits a, 30 high-wind-pressure down-the-hole drill bits b, 30 high-wind-pressure down-the-hole drill bits c and 30 high-wind-pressure down-the-hole drill bits d under the same working condition, wherein in the test, the drill bits are worn and increased along with the increase of the drill hole length, when the drill hole is worn to a certain degree, the drill bits are scrapped when the drilling process is not stopped (the drilling propelling speed is lower than 1cm/min), at the moment, the drill hole length is calculated as the service life, the difference between the measured trouser diameter of the drill bits and the original diameter is the wear loss of the trouser diameter, and the test results are shown in the table 1:
TABLE 1 test results of high wind pressure down-the-hole drill bits a, b, c, d under the same working conditions
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A preparation method of a high wind pressure down-the-hole drill bit comprises the following steps:
A) machining the steel billet to obtain a down-the-hole drill trouser body;
B) carburizing the down-the-hole drill pants body, and cooling;
C) normalizing the down-the-hole drill pants cooled in the step B);
D) heating the normalized down-the-hole drill pants body to 855-865 ℃, preserving heat, performing primary vacuum oil quenching, cooling, cleaning, heating to 675-685 ℃, preserving heat, performing secondary vacuum oil quenching, cooling, cleaning and drying;
the temperature of the primary vacuum oil quenching is 60-75 ℃, and the vacuum degree is less than 10 -2 Pa；
The temperature of the secondary vacuum oil quenching is 60-65 ℃, and the vacuum degree is less than 10 -2 Pa；
E) D), carrying out deep cooling treatment on the down-hole drilling trousers body obtained in the step D), and then air cooling to room temperature;
F) tempering the down-the-hole drill pants obtained in the step E) at a low temperature, and then cooling in air;
G) and D) embedding hard alloy spherical teeth on the down-the-hole drill pants obtained in the step F), and then carrying out shot blasting treatment to obtain the high-air-pressure down-the-hole drill bit.
2. The method according to claim 1, wherein in step a), the material of the steel slab is 23CrNi3Mo steel;
the steel billet is prepared according to the following method:
after hot forging, normalizing at 855-865 ℃, and then tempering at 615-625 ℃ to obtain a steel billet.
3. The preparation method according to claim 1, wherein in the step B), the temperature of the carburizing treatment is 915-925 ℃ and the time is 6-7 h;
the surface carbon concentration of the carburized down-the-hole drill pants body is 0.7-1.3%;
the temperature after cooling is 40-60 ℃.
4. The preparation method according to claim 1, wherein in the step C), the temperature for heating in the normalizing is 905-915 ℃ and the heating time is 2-3 h.
5. The preparation method according to claim 1, wherein in the step D), the down-the-hole drill pants after normalizing are heated to 855-865 ℃ and then are kept warm for 1.5-2.5 hours;
Heating to 675-685 ℃, and keeping the temperature for 0.5-1.5 h.
6. The preparation method according to claim 1, wherein in the step D), the time of one vacuum oil quenching is 0.5-1 h.
7. The preparation method of claim 1, wherein in the step D), the time of the secondary vacuum oil quenching is 0.5-1 h.
8. The preparation method according to claim 1, wherein the temperature of the cryogenic treatment in the step E) is-85 to-70 ℃ and the time is 1.5 to 2.5 hours.
9. The preparation method according to claim 1, wherein in the step F), the low-temperature tempering temperature is 215-225 ℃ and the time is 5.5-6.5 h.
10. The high wind pressure down-the-hole drill bit prepared by the preparation method of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110183354.4A CN112981306B (en) | 2021-02-10 | 2021-02-10 | High-wind-pressure down-the-hole drill bit and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110183354.4A CN112981306B (en) | 2021-02-10 | 2021-02-10 | High-wind-pressure down-the-hole drill bit and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112981306A CN112981306A (en) | 2021-06-18 |
| CN112981306B true CN112981306B (en) | 2022-09-13 |
Family
ID=76392971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110183354.4A Active CN112981306B (en) | 2021-02-10 | 2021-02-10 | High-wind-pressure down-the-hole drill bit and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112981306B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3842921A (en) * | 1973-08-10 | 1974-10-22 | Hughes Tool Co | Boronized drill bit cutters |
| CN102703911B (en) * | 2012-06-29 | 2014-03-05 | 长沙黑金刚实业有限公司 | Heat treatment method for down-the-hole drill bit of high-wind pressure drilling tool, and drill bit |
| CN102776520B (en) * | 2012-08-03 | 2015-01-14 | 西北矿冶研究院 | Heat treatment process for shank of rock drill |
| CN107881390A (en) * | 2017-11-24 | 2018-04-06 | 四川东大恒泰电气有限责任公司 | A kind of preparation technology of oil/gas drilling drill bit special utility alloy |
| JP6503523B1 (en) * | 2019-01-25 | 2019-04-17 | 古河ロックドリル株式会社 | Drill tool and method of manufacturing the same |
| CN110129526A (en) * | 2019-05-29 | 2019-08-16 | 河南四方达超硬材料股份有限公司 | Preparation method of high-wind-pressure diamond down-the-hole drill steel body and drill using same |
-
2021
- 2021-02-10 CN CN202110183354.4A patent/CN112981306B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112981306A (en) | 2021-06-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104981556B (en) | Tufftride high-frequency quenching steel part | |
| CN106591774B (en) | A kind of composite heat treating process of H13 mold steel cutter | |
| WO1999034023A1 (en) | Continuous annealing furnace, rolling bearing, annealing method, and method of manufacturing inner and outer races of deeply groove ball bearing | |
| WO2001068933A2 (en) | High performance carburizing stainless steel for high temperature use | |
| CN104562048A (en) | Heat treatment process for En40B type rock drilling tool shank | |
| US3954517A (en) | Method for making carburized bearing members | |
| CN110802373A (en) | Prestress forging method applied to bearing ring | |
| CN104195311A (en) | Heat treatment process for rollers of roller bits | |
| CN110564922B (en) | Improved quenching process for steel for gear wheel | |
| JP6055397B2 (en) | Bearing parts having excellent wear resistance and manufacturing method thereof | |
| US4004952A (en) | Carburized bearing members | |
| AU2021366577B2 (en) | Carburized workpiece and preparation method therefor | |
| CN110565046A (en) | heat treatment method for rock drilling rod | |
| CN112981306B (en) | High-wind-pressure down-the-hole drill bit and preparation method thereof | |
| EP2749666B1 (en) | Thermo-mechanical process for martensitic bearing steels and steel bearing component | |
| CN116855879A (en) | Heat treatment process control method of high-wear-resistance carburized drill tool | |
| CN104481410A (en) | High-hardness wear-resistant rock drill manufacturing method | |
| CN112795730B (en) | Heat treatment method for improving performance of drilling tool for down-the-hole drill | |
| CN114941104A (en) | Ultrahigh-strength 30CrNi2MoV forging drilling tool material and heat treatment process | |
| CN112853049B (en) | High-performance shaft sleeve material and heat treatment method thereof | |
| CN108060353A (en) | A kind of shield engine disk type hobbing cutter ring alloy | |
| CN105734408A (en) | High-strength toughness carburized and air-cooled steel for tunneling tool and production method thereof | |
| JPS6145686B2 (en) | ||
| CN113083937A (en) | Production process of bearing steel pipe for cold-rolled expanded bearing | |
| CN111440995A (en) | Method for manufacturing small-aperture ring die |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |