阅读说明：本技术 一种高风压钎具潜孔钻头的热处理方法 (Heat treatment method of high-wind-pressure drilling tool down-the-hole drill bit ) 是由 武富华 于 2021-05-21 设计创作，主要内容包括：本发明公开了一种高风压钎具潜孔钻头的热处理方法,本发明涉及钻头热处理技术领域,包括基本成型、三段回火、冷却加工、热处理渗碳、淬火、最终加工,将潜孔钻头原始件放入到加热炉中,使其加热到730℃,保温时间为10min,加热完毕后,对原始件进行锻打,让潜孔钻头基本成型。该装置通过第二阶段使回火炉继续升温,使温度升至为340～410℃,让钻头得到回火屈氏体组织,第三阶段使回火炉再次升温,使温度升至为490～660℃,让钻头得到回火索氏体组织,与普通的钻头热处理方式相比较,该热处理方法能够提高钻头的韧性以及强度,且在热处理中采用三段回火的方式,进一步提高了钻头的硬度和疲劳强度,进而延长了该钻头的使用寿命。(The invention discloses a heat treatment method of a down-the-hole drill bit of a high-air-pressure drilling tool, which relates to the technical field of drill bit heat treatment and comprises basic forming, three-section tempering, cooling processing, heat treatment carburizing, quenching and final processing, wherein an original piece of the down-the-hole drill bit 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 bit to be basically formed. The device enables the tempering furnace to continue to be heated up to 340-410 ℃ through the second stage, the drill bit obtains a tempered troostite structure, the tempering furnace is enabled to be heated up again through the third stage, the temperature is increased to 490-660 ℃, the drill bit obtains a tempered sorbite structure, compared with a common drill bit heat treatment mode, the heat treatment method can improve the toughness and the strength of the drill bit, a three-stage tempering mode is adopted in heat treatment, the hardness and the fatigue strength of the drill bit are further improved, and the service life of the drill bit is further prolonged.)

1. A heat treatment method for a down-the-hole drill bit of a high wind pressure drilling tool is characterized by comprising the following steps:

s1, basic molding: placing the down-the-hole drill bit original piece into a heating furnace, heating to 730-840 ℃, keeping the temperature for 10-20 min, forging the original piece after heating is finished, basically forming the down-the-hole drill bit, and placing the down-the-hole drill bit original piece into a forging die for forming and die forging after forming;

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 in the tempering furnace at three stages, wherein in the first stage, the tempering furnace is heated to 150-255 ℃ to ensure that the drill bit obtains a tempered martensite structure, in the second stage, the tempering furnace is continuously heated to 340-410 ℃ to ensure that the drill bit obtains a tempered troostite structure, and in the third stage, the tempering furnace is heated again to 490-660 ℃ to ensure that the drill bit obtains a tempered sorbite structure;

s3, cooling and 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 and carburization: adding a carburizing agent into a carburizing furnace, then placing 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 be 1.1-1.48 mm, keeping the surface carbon concentration to be 0.77-1.2%, and cooling to normal temperature after carburization is finished;

s5, quenching: putting the drill bit cooled in the step S4 into a preheating furnace, preheating the drill bit for 1-1.5 hours at the temperature of 420-470 ℃, then continuously heating the salt bath furnace to the temperature of 580-630 ℃, taking nitrate as a quenching agent, after quenching, keeping the temperature of the drill bit at 210-230 ℃ for 18-28 min, then heating the drill bit to the temperature of 270-330 ℃ for 1-2.4 hours, and cooling the drill bit to the normal temperature after keeping the temperature;

s6, final processing: and (5) putting the drill bit on the machine tool again after the treatment in the step (S5), and performing powder discharge groove, transverse groove, gear surface inclination and deburring work on the drill bit to finally finish the processing heat treatment work of the down-the-hole drill bit.

2. The heat treatment method of the high wind pressure drill tool down-the-hole drill bit according to claim 1, characterized in that: in step S1, after the drill is formed and swaged, the drill is placed in cooling oil to be cooled, and the drill is cooled to room temperature.

3. The heat treatment method of the high wind pressure drill tool down-the-hole drill bit according to claim 1, characterized in that: 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 heat treatment method of the high wind pressure drill tool down-the-hole drill bit according to claim 1, characterized in that: in the step S3, when the drill bit is cooled, the drill bit is first put into brine, cooled to 160-220 ℃, then taken out for air cooling, and cooled to room temperature.

5. The heat treatment method of the high wind pressure drill tool down-the-hole drill bit according to claim 1, characterized in that: 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 heat treatment method of the high wind pressure drill tool down-the-hole drill bit according to claim 1, characterized in that: in the step S4, after the drill bit is carburized, the drill bit is naturally cooled to 150-260 ℃, and then the drill bit is placed into a salt bath to be cooled to normal temperature.

7. The heat treatment method of the high wind pressure drill tool down-the-hole drill bit according to claim 1, characterized in that: in the step S5, when the drill bit is quenched, the temperature is uniformly increased at a speed of 45-57 ℃/min until the temperature is increased to 580-630 ℃.

8. The heat treatment method of the high wind pressure drill tool down-the-hole drill bit according to claim 1, characterized in that: in step S6, when the drill is machined, an electromagnetic plate is disposed below the drill machining position, so that the scraps generated by the drill machining are adsorbed on the electromagnetic plate, thereby facilitating the treatment of the scraps.

Technical Field

The invention relates to the technical field of drill bit heat treatment, in particular to a heat treatment method of a down-the-hole drill bit of a high-air-pressure drilling tool.

Background

The drill bit is a cutting tool used by a typical drill or drilling machine to cut a circular hole. The basic principle of the drill bit is to make the drill bit cut edges and rotate, cut workpieces and remove drill cuttings by a drill groove, the types of the drill bits are various, and the down-the-hole drill bit is one of the drill bits, is mainly matched with a high-air-pressure drill tool for use, and is mainly used for rock breaking, drilling and blasting in engineering construction of buildings, roads, mines, tunnels and the like.

However, when the down-the-hole drill bit is subjected to processing heat treatment at present, the strength and toughness effects of the processed down-the-hole drill bit are not ideal, and the down-the-hole drill bit is easy to damage after being used for a long time, and the defect is not correspondingly improved.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a heat treatment method of a down-the-hole drill bit of a high-wind-pressure drilling tool, which solves the problems that the strength and toughness of the processed down-the-hole drill bit are not ideal and the down-the-hole drill bit is easy to damage after being used for a long time when the down-the-hole drill bit is processed and heat treated at present.

In order to achieve the purpose, the invention is realized by the following technical scheme: a heat treatment method for a down-the-hole drill bit of a high wind pressure drilling tool comprises the following steps:

s1, basic molding: placing the down-the-hole drill bit original piece into a heating furnace, heating to 730-840 ℃, keeping the temperature for 10-20 min, forging the original piece after heating is finished, basically forming the down-the-hole drill bit, and placing the down-the-hole drill bit original piece into a forging die for forming and die forging after forming;

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 in the tempering furnace at three stages, wherein in the first stage, the tempering furnace is heated to 150-255 ℃ to ensure that the drill bit obtains a tempered martensite structure, in the second stage, the tempering furnace is continuously heated to 340-410 ℃ to ensure that the drill bit obtains a tempered troostite structure, and in the third stage, the tempering furnace is heated again to 490-660 ℃ to ensure that the drill bit obtains a tempered sorbite structure;

s3, cooling and 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 and carburization: adding a carburizing agent into a carburizing furnace, then placing 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 be 1.1-1.48 mm, keeping the surface carbon concentration to be 0.77-1.2%, and cooling to normal temperature after carburization is finished;

s5, quenching: putting the drill bit cooled in the step S4 into a preheating furnace, preheating the drill bit for 1-1.5 hours at the temperature of 420-470 ℃, then continuously heating the salt bath furnace to the temperature of 580-630 ℃, taking nitrate as a quenching agent, after quenching, keeping the temperature of the drill bit at 210-230 ℃ for 18-28 min, then heating the drill bit to the temperature of 270-330 ℃ for 1-2.4 hours, and cooling the drill bit to the normal temperature after keeping the temperature;

s6, final processing: and (5) putting the drill bit on the machine tool again after the treatment in the step (S5), and performing powder discharge groove, transverse groove, gear surface inclination and deburring work on the drill bit to finally finish the processing heat treatment work of the down-the-hole drill bit.

Preferably, in step S1, after the drill is formed and swaged, the drill is placed in cooling oil to be cooled, and the drill is allowed to cool to room temperature.

Preferably, 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.

Preferably, in the step S3, when the drill bit is cooled, the drill bit is first put into brine, cooled to 160 to 220 ℃, then taken out for air cooling, and cooled to room temperature.

Preferably, 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.

Preferably, in the step S4, after the drill is carburized, the drill is naturally cooled to 150 to 260 ℃, and then the drill is placed in a salt bath to be cooled to normal temperature.

Preferably, in the step S5, the drill bit is quenched by uniformly heating at a speed of 45-57 ℃/min until the temperature is increased to 580-630 ℃.

Preferably, in step S6, when machining the drill, an electromagnetic plate is disposed below the drill machining position, so that the scraps generated by the drill machining are adsorbed on the electromagnetic plate to facilitate disposal of the scraps.

Advantageous effects

The invention provides a heat treatment method of a down-the-hole drill bit of a high-wind-pressure drilling tool. 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 tool down-hole drill bit, the tempering furnace is heated to 150-255 ℃ in the first stage, the drill bit obtains a tempered martensite structure, the tempering furnace is continuously heated in the second stage to 340-410 ℃, the drill bit obtains a tempered troostite structure, the tempering furnace is heated again in the third stage to 490-660 ℃, and the drill bit obtains a tempered sorbite structure.

2. According to the heat treatment method of the high-air-pressure drill tool 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 being processed is improved, the corrosion resistance of the drill bit can be improved, the drill bit can work in various environments, and the application range of the drill bit is enlarged.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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.

Referring to fig. 1, the present invention provides three technical solutions:

example one

A heat treatment method for a down-the-hole drill bit of a high wind pressure drilling tool comprises the following steps:

s1, basic molding: placing the down-the-hole drill bit original piece into a heating furnace, heating the down-the-hole drill bit original piece to 730 ℃, keeping the temperature for 10min, forging the original piece after heating is finished, basically forming the down-the-hole drill bit, and placing the down-the-hole drill bit original piece into a forging die for forming and die forging after forming;

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 in the tempering furnace at three stages, wherein in the first stage, the tempering furnace is heated to 150 ℃ to ensure that the drill bit obtains a tempered martensite structure, in the second stage, the tempering furnace is continuously heated to 340 ℃ to ensure that the drill bit obtains a tempered troostite structure, and in the third stage, the tempering furnace is heated again to 490 ℃ to ensure that the drill bit obtains a tempered sorbite structure;

s3, cooling and 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 and carburization: adding a carburizing agent into a carburizing furnace, then placing 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 to be 1.1mm, keeping the surface carbon concentration to be 0.77%, and cooling the carburized layer to normal temperature after the carburization is finished;

s5, quenching: putting the drill bit cooled in the step S4 into a preheating furnace, preheating the drill bit for 1 hour at the temperature of 420 ℃, then continuously heating the salt bath furnace to the temperature of 580 ℃, taking nitrate as a quenching agent, after quenching, keeping the temperature of the drill bit at the temperature of 210 ℃ for 18 minutes, then heating the drill bit to the temperature of 270 ℃ for 1 hour, and cooling the drill bit to the normal temperature after keeping the temperature;

s6, final processing: and (5) putting the drill bit on the machine tool again after the treatment in the step (S5), and performing powder discharge groove, transverse groove, gear surface inclination and deburring work on the drill bit to finally finish the processing heat treatment work of the down-the-hole drill bit.

In the embodiment of the invention, in step S1, after the drill is formed and die-forged, the drill is placed into cooling oil to be cooled, and the drill is cooled to room temperature.

In the embodiment of the invention, in the 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 present invention, in step S3, when the drill bit is cooled, the drill bit is first put into brine, cooled to 160 ℃, then taken out for air cooling, and cooled 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 the step S4, after the drill bit is carburized, the drill bit is naturally cooled to 150 ℃, and then the drill bit is put into a salt bath to be cooled to the normal temperature.

In the embodiment of the invention, in step S5, when the drill bit is quenched, the temperature is uniformly increased at 45 ℃/min until the temperature is increased to 580 ℃.

In the embodiment of the present invention, in step S6, when the drill is machined, an electromagnetic plate is disposed below the drill machining position, so that the scraps generated by the drill machining are adsorbed on the electromagnetic plate, thereby facilitating the treatment of the scraps.

Example two

A heat treatment method for a down-the-hole drill bit of a high wind pressure drilling tool comprises the following steps:

s1, basic molding: placing the down-the-hole drill bit original piece into a heating furnace, heating the down-the-hole drill bit original piece to 840 ℃, keeping the temperature for 20min, forging the original piece after heating is finished, basically forming the down-the-hole drill bit, and placing the down-the-hole drill bit original piece into a forging die for forming and die forging after forming;

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 in the tempering furnace at three stages, wherein in the first stage, the tempering furnace is heated to 255 ℃ to ensure that the drill bit obtains a tempered martensite structure, in the second stage, the tempering furnace is continuously heated to 410 ℃ to ensure that the drill bit obtains a tempered troostite structure, and in the third stage, the tempering furnace is heated again to 660 ℃ to ensure that the drill bit obtains a tempered sorbite structure;

s3, cooling and 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 and carburization: adding a carburizing agent into a carburizing furnace, then placing the drill bit into the carburizing furnace, heating the carburizing furnace to 970 ℃, keeping the temperature for 55min, keeping the depth of a carburized layer to be 1.48mm, keeping the surface carbon concentration to be 1.2%, and cooling the carburized layer to normal temperature after the carburization is finished;

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 ℃, taking nitrate as a quenching agent, after quenching, keeping the temperature of the drill bit at the temperature of 230 ℃ for 28 minutes, then heating the drill bit to the temperature of 330 ℃ for 2.4 hours, and cooling the drill bit to the normal temperature after keeping the temperature;

s6, final processing: and (5) putting the drill bit on the machine tool again after the treatment in the step (S5), and performing powder discharge groove, transverse groove, gear surface inclination and deburring work on the drill bit to finally finish the processing heat treatment work of the down-the-hole drill bit.

In the embodiment of the invention, in step S1, after the drill is formed and die-forged, the drill is placed into cooling oil to be cooled, and the drill is cooled to room temperature.

In the embodiment of the invention, in the 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 present invention, in step S3, when the drill bit is cooled, the drill bit is first put into brine, cooled to 220 ℃, then taken out for air cooling, and cooled to 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 the drill is carburized, the drill is naturally cooled to 260 ℃, and then the drill is placed in 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 raised at a constant speed of 57 ℃/min until the temperature is raised to 630 ℃.

In the embodiment of the present invention, in step S6, when the drill is machined, an electromagnetic plate is disposed below the drill machining position, so that the scraps generated by the drill machining are adsorbed on the electromagnetic plate, thereby facilitating the treatment of the scraps.

EXAMPLE III

A heat treatment method for a down-the-hole drill bit of a high wind pressure drilling tool comprises the following steps:

s1, basic molding: placing the down-the-hole drill bit original piece into a heating furnace, heating the down-the-hole drill bit original piece to 760 ℃, keeping the temperature for 15min, forging the original piece after heating is finished, basically forming the down-the-hole drill bit, and placing the down-the-hole drill bit original piece into a forging die for forming and die forging after forming;

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 in the tempering furnace at three stages, wherein in the first stage, the tempering furnace is heated to 200 ℃ to ensure that the drill bit obtains a tempered martensite structure, in the second stage, the tempering furnace is continuously heated to 380 ℃ to ensure that the drill bit obtains a tempered troostite structure, and in the third stage, the tempering furnace is heated again to 550 ℃ to ensure that the drill bit obtains a tempered sorbite structure;

s3, cooling and 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 and carburization: adding a carburizing agent into a carburizing furnace, then placing 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 to be 1.3mm, keeping the surface carbon concentration to be 0.9%, and cooling the carburized layer to normal temperature after the carburization is finished;

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 ℃, taking nitrate as a quenching agent, after quenching, keeping the temperature of the drill bit at 220 ℃ for 24 minutes, then heating the drill bit to 300 ℃ for 2 hours, and cooling the drill bit to the normal temperature after keeping the temperature;

s6, final processing: and (5) putting the drill bit on the machine tool again after the treatment in the step (S5), and performing powder discharge groove, transverse groove, gear surface inclination and deburring work on the drill bit to finally finish the processing heat treatment work of the down-the-hole drill bit.

In the embodiment of the invention, in step S1, after the drill is formed and die-forged, the drill is placed into cooling oil to be cooled, and the drill is cooled to room temperature.

In the embodiment of the invention, in the step S2, in the three-stage tempering process of the drill bit, the heat preservation time of the three stages is 50min, 60min and 83min in sequence.

In the embodiment of the present invention, in step S3, when the drill is cooled, the drill is first put into brine, cooled to 190 ℃, then taken out for air cooling, and cooled to 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 the drill is carburized, the drill is naturally cooled to 210 ℃, and then the drill is placed in a salt bath to be cooled to normal temperature.

In the embodiment of the invention, in the step S5, when the drill bit is quenched, the temperature is uniformly increased at a speed of 50 ℃/min until the temperature is increased to 600 ℃.

In the embodiment of the present invention, in step S6, when the drill is machined, an electromagnetic plate is disposed below the drill machining position, so that the scraps generated by the drill machining are adsorbed on the electromagnetic plate, thereby facilitating the treatment of the scraps.

It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.