CN113430353B - Heat treatment method for high-wind-pressure down-the-hole drill bit of drill tool - Google Patents
Heat treatment method for high-wind-pressure down-the-hole drill bit of drill tool Download PDFInfo
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- CN113430353B CN113430353B CN202110555786.3A CN202110555786A CN113430353B CN 113430353 B CN113430353 B CN 113430353B CN 202110555786 A CN202110555786 A CN 202110555786A CN 113430353 B CN113430353 B CN 113430353B
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- 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
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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
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- 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
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- 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
- C23C8/60—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 solids, e.g. powders, pastes
- C23C8/62—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 solids, e.g. powders, pastes only one element being applied
- C23C8/64—Carburising
- C23C8/66—Carburising of ferrous surfaces
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- 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
- C23C8/80—After-treatment
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- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
-
- 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
- C21D2261/00—Machining or cutting being involved
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Articles (AREA)
- Forging (AREA)
Abstract
The invention discloses a heat treatment method of a high wind pressure drill down-the-hole drill, which relates to the technical field of drill heat treatment and comprises the steps of basic forming, three-stage tempering, cooling processing, heat treatment carburizing, quenching and final processing, wherein an original piece of the down-the-hole drill is placed into a heating furnace to be heated to 730 ℃, the heat preservation time is 10min, and after the heating is finished, the original piece is forged to enable the down-the-hole drill to be basically formed. The device is through the continuous intensification of second stage messenger tempering furnace, makes the temperature rise to 340 ~ 410 ℃, lets the drill bit obtain tempering troostite tissue, and the third stage makes tempering furnace intensifies once more, makes the temperature rise to 490 ~ 660 ℃, lets the drill bit obtain tempering troostite tissue, compares with ordinary drill bit heat treatment mode, and this heat treatment method can improve toughness and intensity of drill bit, and adopts the mode of three-stage tempering in heat treatment, has further improved hardness and fatigue strength of drill bit, and then has prolonged the life of this drill bit.
Description
Technical Field
The invention relates to the technical field of heat treatment of drill bits, in particular to a heat treatment method of a down-the-hole drill bit with a high wind pressure drill tool.
Background
A drill bit is a cutting tool commonly used in drills or drilling machines to cut circular holes. The basic principle of the drill bit is that the drill bit is used for cutting edges, rotating, cutting workpieces and removing drill cuttings through drill grooves, the types of the drill bit are various, the down-the-hole drill bit is one of the drill bits, and the down-the-hole drill bit is mainly matched with a high wind pressure drill bit for use, and is mainly used for cutting rock, cutting blasting and drilling in engineering construction such as construction, roads, mines, tunnels and the like.
However, when the down-the-hole drill is processed and heat treated at present, the strength and toughness effects of the processed down-the-hole drill are not ideal, the down-the-hole drill is easy to damage after long-time use, and the defect is not improved correspondingly.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a heat treatment method of a high-wind pressure drill down-the-hole drill, which solves the problems that the strength and toughness of the processed down-the-hole drill are not ideal and the down-the-hole drill is easy to damage after long-time use when the down-the-hole drill is processed and heat treated at present.
In order to achieve the above purpose, the invention is realized by the following technical scheme: a heat treatment method of a high wind pressure drill down-the-hole drill bit comprises the following steps:
s1, basically molding: placing the original piece of the down-the-hole drill bit into a heating furnace, heating the original piece to 730-840 ℃ for 10-20 min, forging the original piece after heating, basically molding the down-the-hole drill bit, and placing the molded down-the-hole drill bit into a forging die for molding and forging;
s2, three-stage tempering: putting the drill bit formed and die-forged in the step S1 into a tempering furnace for tempering, so that the drill bit is tempered at three stages in the tempering furnace, wherein the tempering furnace is heated to 150-255 ℃ in the first stage, tempered martensite tissues are obtained by the drill bit, the tempering furnace is continuously heated in the second stage, the temperature is raised to 340-410 ℃, tempered troostite tissues are obtained by the drill bit, the tempering furnace is heated again in the third stage, the temperature is raised to 490-660 ℃, and tempered sorbite tissues are obtained by the drill bit;
s3, cooling processing: taking out the drill bit after tempering in the step S2, cooling to normal temperature, putting the drill bit on a lathe, and carrying out numerical control machining on the drill bit according to the size of a drawing;
s4, heat treatment carburization: adding a carburizing agent into a carburizing furnace, then putting a drill bit into the carburizing furnace, heating the carburizing furnace to 890-970 ℃, keeping the temperature for 35-55 min, keeping the depth of a carburized layer to 1.1-1.48 mm, and cooling the drill bit to normal temperature after carburization is finished, wherein the surface carbon concentration is 0.77-1.2%;
s5, quenching: putting the drill bit cooled in the step S4 into a preheating furnace, preheating the drill bit for 1 to 1.5 hours at the temperature of 420 to 470 ℃, then continuously heating up the salt bath furnace to the temperature of 580 to 630 ℃, adopting nitrate as a quenching agent, keeping the temperature of 210 to 230 ℃ for 18 to 28 minutes after quenching, then keeping the temperature of 270 to 330 ℃ for 1 to 2.4 hours, and cooling the drill bit to normal temperature after the heat preservation is finished;
s6, final processing: and (5) putting the drill bit after the treatment in the step (S5) on a machine tool again, and carrying out the work of powder discharge groove, transverse groove, turning tooth surface inclination and deburring on the drill bit to finally finish the work of machining and heat treatment of the down-the-hole drill bit.
Preferably, in the step S1, after the drill is formed and swaged, the drill is put into a cooling oil to be cooled, and the drill is cooled to room temperature.
Preferably, in the step S2, in the three-stage tempering process of the drill, the heat preservation time of the three stages is 45-55 min, 55-68 min and 75-95 min in sequence.
Preferably, in the step S3, when the drill is cooled, the drill is put into brine, cooled to 160-220 ℃, taken out for air cooling, and cooled to room temperature.
Preferably, in the step S4, the carburizing agent is formed by combining 8-35% of polymer, 55-65% of carbon powder, 8-14% of carbonate and 15-22% of aluminum oxide.
Preferably, in the step S4, after carburization of the drill bit is completed, the drill bit is naturally cooled to 150-260 ℃, and then the drill bit is put into a salt bath to be cooled to normal temperature.
Preferably, in the step S5, when quenching the drill, the temperature is raised at a constant speed of 45 to 57 ℃/min until the temperature reaches 580 to 630 ℃.
Preferably, in the step S6, when the drill is machined, an electromagnetic plate is disposed below the position where the drill is machined, so that the scraps generated by the machining of the drill are adsorbed on the electromagnetic plate, and the scraps are conveniently treated.
Advantageous effects
The invention provides a heat treatment method of a high-wind pressure drill down-the-hole drill bit. Compared with the prior art, the method has the following beneficial effects:
1. according to the heat treatment method of the high-wind pressure drill down-the-hole drill, the tempering furnace is heated to 150-255 ℃ in the first stage, the drill is enabled to obtain a tempered martensitic structure, the tempering furnace is continuously heated in the second stage, the temperature is raised to 340-410 ℃, the drill is enabled to obtain a tempered troostite structure, the tempering furnace is heated again in the third stage, the temperature is raised to 490-660 ℃, and the drill is enabled to obtain a tempered troostite structure.
2. According to the heat treatment method of the high-wind pressure drill down-the-hole drill bit, the added carburizing agent is formed by combining 8% of polymer, 55% of carbon powder, 8% of carbonate and 15% of aluminum oxide, and the polymer, the nitrate and the aluminum oxide are adopted, so that the heat treatment efficiency of the drill bit is higher, the strength of the drill bit after processing is improved, meanwhile, the corrosion resistance of the drill bit can be improved, the drill bit can work in various environments, and the applicability of the drill bit is increased.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present invention provides three technical solutions:
example 1
A heat treatment method of a high wind pressure drill down-the-hole drill bit comprises the following steps:
s1, basically molding: placing the original piece of the down-the-hole drill bit into a heating furnace, heating the original piece to 730 ℃, keeping the temperature for 10min, forging the original piece after heating is finished, basically molding the down-the-hole drill bit, and placing the molded down-the-hole drill bit into a forging die for molding and forging;
s2, three-stage tempering: putting the drill bit formed and die-forged in the step S1 into a tempering furnace for tempering, so that the drill bit is tempered at three stages in the tempering furnace, wherein the tempering furnace is heated to 150 ℃ in the first stage, the drill bit obtains tempered martensite structure, the tempering furnace is continuously heated in the second stage, the temperature is raised to 340 ℃, the drill bit obtains tempered troostite structure, the tempering furnace is heated again in the third stage, the temperature is raised to 490 ℃ and the drill bit obtains tempered troostite structure;
s3, cooling processing: taking out the drill bit after tempering in the step S2, cooling to normal temperature, putting the drill bit on a lathe, and carrying out numerical control machining on the drill bit according to the size of a drawing;
s4, heat treatment carburization: adding a carburizing agent into a carburizing furnace, then putting a drill bit into the carburizing furnace, heating the carburizing furnace to 890 ℃, keeping the temperature for 35min, keeping the depth of a carburized layer at 1.1mm and the surface carbon concentration at 0.77%, and cooling the drill bit to normal temperature after carburization;
s5, quenching: putting the drill bit cooled in the step S4 into a preheating furnace, preheating the drill bit for 1h at 420 ℃, then continuously heating the salt bath furnace to 580 ℃, adopting nitrate as a quenching agent, keeping the temperature at 210 ℃ for 18min after quenching is finished, then keeping the temperature at 270 ℃ for 1h, and cooling the drill bit to normal temperature after the heat preservation is finished;
s6, final processing: and (5) putting the drill bit after the treatment in the step (S5) on a machine tool again, and carrying out the work of powder discharge groove, transverse groove, turning tooth surface inclination and deburring on the drill bit to finally finish the work of machining and heat treatment of the down-the-hole drill bit.
In the embodiment of the invention, in step S1, after the drill bit is molded and swaged, the drill bit is placed into cooling oil for cooling, and the drill bit is cooled to room temperature.
In the embodiment of the invention, in step S2, in the three-stage tempering process of the drill bit, the heat preservation time of the three stages is 45min,55min and 75min in sequence.
In the embodiment of the invention, in step S3, when the drill bit is cooled, the drill bit is put into brine to be cooled to 160 ℃, and then taken out for air cooling to room temperature.
In the embodiment of the invention, in the step S4, the added carburizing agent is formed by combining 18% of polymer, 57% of carbon powder, 10% of carbonate and 15% of aluminum oxide.
In the embodiment of the invention, in step S4, after carburization of the drill bit is completed, the drill bit is naturally cooled to 150 ℃, and then the drill bit is put into a salt bath to be cooled to normal temperature.
In the embodiment of the invention, in step S5, when the drill bit is quenched, the temperature is increased at a constant speed of 45 ℃ per minute until the temperature reaches 580 ℃.
In the embodiment of the invention, in step S6, when the drill is machined, an electromagnetic plate is arranged below the machining position of the drill, so that scraps generated by the machining of the drill are adsorbed on the electromagnetic plate, and the scraps are conveniently treated.
Example two
A heat treatment method of a high wind pressure drill down-the-hole drill bit comprises the following steps:
s1, basically molding: placing the original piece of the down-the-hole drill bit into a heating furnace, heating the original piece to 840 ℃, keeping the temperature for 20min, forging the original piece after heating is finished, basically molding the down-the-hole drill bit, and placing the molded down-the-hole drill bit into a forging die for molding and forging;
s2, three-stage tempering: putting the drill bit formed and die-forged in the step S1 into a tempering furnace for tempering, so that the drill bit is tempered at three stages in the tempering furnace, wherein the tempering furnace is heated to 255 ℃ in the first stage, the drill bit obtains tempered martensite structure, the tempering furnace is continuously heated in the second stage, the temperature is raised to 410 ℃, the drill bit obtains tempered troostite structure, the tempering furnace is heated again in the third stage, the temperature is raised to 660 ℃, and the drill bit obtains tempered troostite structure;
s3, cooling processing: taking out the drill bit after tempering in the step S2, cooling to normal temperature, putting the drill bit on a lathe, and carrying out numerical control machining on the drill bit according to the size of a drawing;
s4, heat treatment carburization: adding a carburizing agent into a carburizing furnace, then putting a drill bit into the carburizing furnace, heating the carburizing furnace to 970 ℃, keeping the temperature for 55min, keeping the depth of a carburized layer at 1.48mm and the surface carbon concentration at 1.2%, and cooling the drill bit to normal temperature after carburization;
s5, quenching: putting the drill bit cooled in the step S4 into a preheating furnace, preheating the drill bit for 1.5 hours at the temperature of 470 ℃, then continuously heating the salt bath furnace to the temperature of 630 ℃, adopting nitrate as a quenching agent, keeping the temperature at the temperature of 230 ℃ for 28 minutes after quenching is finished, then keeping the temperature at 330 ℃ for 2.4 hours, and cooling the drill bit to normal temperature after the heat preservation is finished;
s6, final processing: and (5) putting the drill bit after the treatment in the step (S5) on a machine tool again, and carrying out the work of powder discharge groove, transverse groove, turning tooth surface inclination and deburring on the drill bit to finally finish the work of machining and heat treatment of the down-the-hole drill bit.
In the embodiment of the invention, in step S1, after the drill bit is molded and swaged, the drill bit is placed into cooling oil for cooling, and the drill bit is cooled to room temperature.
In the embodiment of the invention, in step S2, in the three-stage tempering process of the drill bit, the heat preservation time of the three stages is 55min,68min and 95min in sequence.
In the embodiment of the invention, in step S3, when the drill bit is cooled, the drill bit is firstly put into brine to be cooled to 220 ℃, and then taken out for air cooling to the room temperature.
In the embodiment of the invention, in the step S4, the added carburizing agent is formed by combining 10% of polymer, 65% of carbon powder, 10% of carbonate and 15% of aluminum oxide.
In the embodiment of the invention, in step S4, after carburization of the drill bit is completed, the drill bit is naturally cooled to 260 ℃, and then the drill bit is put into a salt bath to be cooled to normal temperature.
In the embodiment of the invention, in step S5, when the drill bit is quenched, the temperature is increased at a constant speed of 57 ℃/min until the temperature reaches 630 ℃.
In the embodiment of the invention, in step S6, when the drill is machined, an electromagnetic plate is arranged below the machining position of the drill, so that scraps generated by the machining of the drill are adsorbed on the electromagnetic plate, and the scraps are conveniently treated.
Example III
A heat treatment method of a high wind pressure drill down-the-hole drill bit comprises the following steps:
s1, basically molding: placing the original piece of the down-the-hole drill bit into a heating furnace, heating the original piece to 760 ℃, keeping the temperature for 15min, forging the original piece after heating is finished, basically molding the down-the-hole drill bit, and placing the molded down-the-hole drill bit into a forging die for molding and forging;
s2, three-stage tempering: putting the drill bit formed and die-forged in the step S1 into a tempering furnace for tempering, so that the drill bit is tempered at three stages in the tempering furnace, wherein the tempering furnace is heated to 200 ℃ in the first stage, the drill bit obtains tempered martensite structure, the tempering furnace is continuously heated in the second stage, the temperature is raised to 380 ℃ to obtain tempered troostite structure, the tempering furnace is heated again in the third stage, the temperature is raised to 550 ℃ to obtain tempered troostite structure;
s3, cooling processing: taking out the drill bit after tempering in the step S2, cooling to normal temperature, putting the drill bit on a lathe, and carrying out numerical control machining on the drill bit according to the size of a drawing;
s4, heat treatment carburization: adding a carburizing agent into a carburizing furnace, then putting a drill bit into the carburizing furnace, heating the carburizing furnace to 930 ℃, keeping the temperature for 40min, keeping the depth of a carburized layer at 1.3mm and the surface carbon concentration at 0.9%, and cooling the drill bit to normal temperature after carburization;
s5, quenching: putting the drill bit cooled in the step S4 into a preheating furnace, preheating the drill bit for 1.3 hours at the temperature of 440 ℃, then continuously heating the salt bath furnace to the temperature of 600 ℃, adopting nitrate as a quenching agent, keeping the temperature at 220 ℃ for 24 minutes after quenching, then keeping the temperature at 300 ℃ for 2 hours, and cooling the drill bit to normal temperature after the heat preservation is finished;
s6, final processing: and (5) putting the drill bit after the treatment in the step (S5) on a machine tool again, and carrying out the work of powder discharge groove, transverse groove, turning tooth surface inclination and deburring on the drill bit to finally finish the work of machining and heat treatment of the down-the-hole drill bit.
In the embodiment of the invention, in step S1, after the drill bit is molded and swaged, the drill bit is placed into cooling oil for cooling, and the drill bit is cooled to room temperature.
In the embodiment of the invention, in step S2, in the three-stage tempering process of the drill bit, the heat preservation time of the three stages is sequentially 50min,60min and 83min.
In the embodiment of the invention, in step S3, when the drill bit is cooled, the drill bit is firstly put into salt water to be cooled to 190 ℃, and then taken out for air cooling to the room temperature.
In the embodiment of the invention, in the step S4, the added carburizing agent is formed by combining 20% of polymer, 57% of carbon powder, 8% of carbonate and 15% of aluminum oxide.
In the embodiment of the invention, in step S4, after carburization of the drill bit is completed, the drill bit is naturally cooled to 210 ℃, and then the drill bit is put into a salt bath to be cooled to normal temperature.
In the embodiment of the invention, in step S5, when the drill bit is quenched, the temperature is increased at a constant speed of 50 ℃/min until the temperature reaches 600 ℃.
In the embodiment of the invention, in step S6, when the drill is machined, an electromagnetic plate is arranged below the machining position of the drill, so that scraps generated by the machining of the drill are adsorbed on the electromagnetic plate, and the scraps are conveniently treated.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The heat treatment method of the high wind pressure drill down-the-hole drill bit is characterized by comprising the following steps:
s1, basically molding: placing the original piece of the down-the-hole drill bit into a heating furnace, heating the original piece to 730-840 ℃ for 10-20 min, forging the original piece after heating, basically molding the down-the-hole drill bit, and placing the molded down-the-hole drill bit into a forging die for molding and forging;
s2, three-stage tempering: putting the drill bit formed and die-forged in the step S1 into a tempering furnace for tempering, so that the drill bit is tempered at three stages in the tempering furnace, wherein the tempering furnace is heated to 150-255 ℃ in the first stage, tempered martensite tissues are obtained by the drill bit, the tempering furnace is continuously heated in the second stage, the temperature is raised to 340-410 ℃, tempered troostite tissues are obtained by the drill bit, the tempering furnace is heated again in the third stage, the temperature is raised to 490-660 ℃, and tempered sorbite tissues are obtained by the drill bit;
s3, cooling processing: taking out the drill bit after tempering in the step S2, cooling to normal temperature, putting the drill bit on a lathe, and carrying out numerical control machining on the drill bit according to the size of a drawing;
s4, heat treatment carburization: adding a carburizing agent into a carburizing furnace, then putting a drill bit into the carburizing furnace, heating the carburizing furnace to 890-970 ℃, keeping the temperature for 35-55 min, keeping the depth of a carburized layer to 1.1-1.48 mm, and cooling the drill bit to normal temperature after carburization is finished, wherein the surface carbon concentration is 0.77-1.2%;
s5, quenching: putting the drill bit cooled in the step S4 into a preheating furnace, preheating the drill bit for 1 to 1.5 hours at the temperature of 420 to 470 ℃, then continuously heating up the salt bath furnace to the temperature of 580 to 630 ℃, adopting nitrate as a quenching agent, keeping the temperature of 210 to 230 ℃ for 18 to 28 minutes after quenching, then keeping the temperature of 270 to 330 ℃ for 1 to 2.4 hours, and cooling the drill bit to normal temperature after the heat preservation is finished;
s6, final processing: and (5) putting the drill bit after the treatment in the step (S5) on a machine tool again, and carrying out the work of powder discharge groove, transverse groove, turning tooth surface inclination and deburring on the drill bit to finally finish the work of machining and heat treatment of the down-the-hole drill bit.
2. The method for heat treatment of a high wind pressure drill down-the-hole drill bit of claim 1, wherein: in the step S1, after the drill is molded and swaged, the drill is put into cooling oil to be cooled, and the drill is cooled to room temperature.
3. The method for heat treatment of a high wind pressure drill down-the-hole drill bit of claim 1, wherein: in the step S2, in the three-stage tempering process of the drill bit, the heat preservation time of the three stages is 45-55 min, 55-68 min and 75-95 min in sequence.
4. The method for heat treatment of a high wind pressure drill down-the-hole drill bit of claim 1, wherein: in the step S3, when the drill bit is cooled, the drill bit is firstly put into salt water to be cooled to 160-220 ℃, and then taken out for air cooling to the room temperature.
5. The method for heat treatment of a high wind pressure drill down-the-hole drill bit of claim 1, wherein: in the step S4, the added carburizing agent is formed by combining 8-35% of polymer, 55-65% of carbon powder, 8-14% of carbonate and 15-22% of aluminum oxide.
6. The method for heat treatment of a high wind pressure drill down-the-hole drill bit of claim 1, wherein: in the step S4, after carburization of the drill bit is completed, the drill bit is naturally cooled to 150-260 ℃, and then the drill bit is put into a salt bath to be cooled to normal temperature.
7. The method for heat treatment of a high wind pressure drill down-the-hole drill bit of claim 1, wherein: in the step S5, when the drill bit is quenched, the temperature is increased at a constant speed of 45-57 ℃/min until the temperature reaches 580-630 ℃.
8. The method for heat treatment of a high wind pressure drill down-the-hole drill bit of claim 1, wherein: in the step S6, when the drill is machined, an electromagnetic plate is disposed below the drill machining position, so that scraps generated in the drill machining are adsorbed on the electromagnetic plate, and the scraps are conveniently treated.
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