CN108612482B - 3D printing method of diamond drill bit containing grinding aid structure - Google Patents

3D printing method of diamond drill bit containing grinding aid structure Download PDF

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CN108612482B
CN108612482B CN201810205866.4A CN201810205866A CN108612482B CN 108612482 B CN108612482 B CN 108612482B CN 201810205866 A CN201810205866 A CN 201810205866A CN 108612482 B CN108612482 B CN 108612482B
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grinding aid
drill bit
diamond
main working
bodies
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CN108612482A (en
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杨展
段隆臣
杨洋
谭松成
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China University of Geosciences
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China University of Geosciences
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/60—Treatment of workpieces or articles after build-up
    • B22F10/64—Treatment of workpieces or articles after build-up by thermal means
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/30—Process control
    • B22F10/32—Process control of the atmosphere, e.g. composition or pressure in a building chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/30—Process control
    • B22F10/36—Process control of energy beam parameters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/30—Process control
    • B22F10/36—Process control of energy beam parameters
    • B22F10/366—Scanning parameters, e.g. hatch distance or scanning strategy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y70/00—Materials specially adapted for additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F2003/248—Thermal after-treatment
    • 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
    • Y02P10/25—Process efficiency

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  • Mining & Mineral Resources (AREA)
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  • Metallurgy (AREA)
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  • Polishing Bodies And Polishing Tools (AREA)
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  • Earth Drilling (AREA)

Abstract

The invention discloses a diamond drill bit with a grinding aid structure, which comprises a plurality of main working bodies arranged along the circumferential direction of the bottom lip surface of the drill bit and a plurality of grinding aid bodies arranged in the main working bodies, wherein the main working bodies are connected with adjacent main working bodies through water gaps, the grinding aid bodies are uniformly distributed in the main working bodies at equal intervals, the total area of the cross section of each grinding aid body is 30-38% of the total area of the main working body, each grinding aid body is a cylinder, the diameter of each grinding aid body is 3-5 mm, the height of each grinding aid body is 12-15 mm, the main working bodies play a role of crushing rocks, and the grinding aid bodies play a role of assisting and indirectly crushing rocks. Also discloses a 3D printing technical method of the diamond bit containing the grinding aid structure. The diamond drill bit can effectively solve the drilling problem of hard and compact rock strata.

Description

3D printing method of diamond drill bit containing grinding aid structure
Technical Field
The invention relates to the technical field of new materials and manufacturing, in particular to a diamond drill bit containing a grinding aid structure and a 3D printing method thereof.
Background
Diamond bits have been developed for decades and are widely used in geological exploration, oil drilling, mining, geological disaster prevention and control, and other industries.
The diamond drill bit is manufactured and formed by adopting a hot pressing method, a pressureless dipping method, a cold pressing sintering method, a hot isostatic pressing method, an electroplating method and other manufacturing methods. However, the matrix alloy of the diamond bit manufactured by the conventional methods is not a real alloy, and the diamond is mainly embedded mechanically, so that the embedding firmness is low, and the quality of the bit is influenced. Secondly, the conventional method has many limitations for manufacturing a diamond drill bit with a complicated structure, or the quality of the drill bit does not meet the design requirements, or the designed complicated structure is difficult to realize.
The 3D printing technology can effectively form high-performance parts of various materials, can form precise parts of complex structures, seems to be processing of complex parts which cannot be realized, and can be easily completed through the 3D printing technology. Due to the advantages, the 3D printing technology has wide application prospects in the industries of electromechanics, earth and mining, aerospace, medical treatment and the like, so that various diamond bits with complex structures are formed by applying the advantages of the 3D printing technology in order to obtain high-performance diamond bits and other diamond tools, and the diamond bits with the complex structures are reasonably and scientifically designed.
At present, the existing diamond drill bit is difficult to drill in hard, compact and weak-abrasive rock strata in the mineral exploration engineering, and even the drilling efficiency is extremely low.
Disclosure of Invention
In view of this, the embodiment of the invention provides a diamond drill bit containing a grinding aid structure and a 3D printing method thereof, wherein the diamond drill bit can effectively drill hard, dense and weak-abrasiveness rock strata and has high drilling efficiency.
The embodiment of the invention provides a diamond drill bit with a grinding aid structure, which comprises a plurality of main working bodies arranged along the circumferential direction of the bottom lip surface of the drill bit and a plurality of grinding aid bodies arranged in the main working bodies, wherein the main working bodies are connected with adjacent main working bodies through water gaps, the grinding aid bodies are uniformly distributed in the main working bodies, the grinding aid bodies and the main working bodies form a fan-shaped working body of the drill bit, the total area of the cross section of the grinding aid bodies is 30-38% of the cross section area of the fan-shaped working body of the drill bit, the grinding aid bodies are cylinders, the main working bodies play a role of crushing rocks, and the grinding aid bodies play a role of assisting and indirectly crushing rocks.
Furthermore, the grinding aids are arranged on the radius of the bottom lip surface and are arranged at equal intervals along the circumferential direction and the diameter direction.
Further, the Rockwell hardness of the main working body is HRC 12-25, and the wear resistance is ML (0.5-0.7) x 10-5The Rockwell hardness of the abrasion-assisting body is HRC 6-10, and the abrasion resistance is ML (1.0-1.2) x 10-5。
The 3D printing method of the diamond drill bit with the grinding aid structure is characterized in that the diamond drill bit with the grinding aid structure is formed by 3D printing of the following raw materials, and the main working body is prepared from the following raw materials: diamond and pre-alloyed powder, wherein the volume concentration of the diamond is 15-25%, the grade of the diamond is SMD40 type, the granularity of the diamond is 30-180 meshes, and the grain size of the pre-alloyed powder is 82-127 mu m; the grinding-assistant body comprises the following raw materials: the silicon carbide and the pre-alloy powder, wherein the volume concentration of the silicon carbide is 5-12%, the granularity of the silicon carbide is 30-70 meshes, and the grain size of the pre-alloy powder is 82-127 mu m.
Further, the prealloying powder in the raw materials of the main working body is FAM-103 type prealloying powder and FAM-201 type prealloying powder, the FAM-103 type prealloying powder accounts for 65-78%, the FAM-201 type prealloying powder accounts for 22-35%, the FAM-103 type prealloying powder comprises Fe-80%, Ni-18% and Co-2%, and the FAM-201 type prealloying powder comprises Cu-60%, Ni-30%, Sn-10% and V-trace; the prealloying powder in the raw materials of the grinding aid body is FAM-201 type prealloying powder and FAM-202 type prealloying powder, the FAM-201 type prealloying powder accounts for 60-70%, the FAM-202 type prealloying powder accounts for 30-40%, the FAM-201 type prealloying powder comprises Fe-60%, Cu-30%, Sn-10% and trace V, and the FAM-202 type prealloying powder comprises Cu-70%, Zn-30% and trace Y.
Further, the 3D printing method includes the steps of:
s1, uniformly mixing raw materials of a main working body in a ball mill;
s2, uniformly mixing the raw materials of the grinding-assistant body in a ball mill;
s3, establishing a three-dimensional model of the drill bit on a computer, and importing the three-dimensional model of the drill bit into 3D printing control software;
s4, respectively forming the raw material of the main working body obtained in the step S1 and the raw material of the grinding-assistant body obtained in the step S2 on a bit body in laser selective melting equipment controlled by 3D printing control software;
s5, taking out the formed drill bit together with the drill bit body, and performing stress relief annealing treatment on the formed drill bit; and obtaining the diamond drill bit containing the grinding aid structure.
Further, in the step S4, the raw material of the main working body and the raw material of the grinding-aid body are firstly fed into a feeding device of the selective laser melting equipment, a molding cavity of the selective laser melting equipment is vacuumized, and a shielding gas is introduced; and then the raw materials of the main working body and the raw materials of the grinding-assisting body are respectively and orderly conveyed to a drill bit body of the forming cavity under the control of 3D printing control software, and a drill bit is formed on the drill bit body.
Further, the parameters of the drill bit formed by the selective laser melting equipment are as follows: the laser power is 160W-250W, the scanning speed is 300-900 mm/s, the scanning interval is 0.05 mm-0.08 mm, and the powder spreading thickness is 0.2 mm-0.6 mm.
Further, in the step S5, the annealing temperature of the stress relief annealing treatment is 250 to 450 ℃, and the annealing time is 3 to 6 hours.
Compared with the prior art, the invention has the following beneficial effects:
(1) the diamond drill bit can effectively drill hard, compact and weak-abrasive rocks, has high drilling efficiency, innovative structure, excellent performance, effectiveness and practicability, and is suitable for large-scale manufacturing and popularization. Meanwhile, the novel structure can achieve the purpose of adjusting the working characteristics of the drill bit by adjusting the diameter and the number of the grinding-aid bodies, and is suitable for effective drilling with different hardness, compact lithology and different working conditions.
(2) The main working body of the diamond bit is a main body for breaking rocks, compared with the performance of a common diamond bit, the hardness of the diamond bit is HRC 12-25, and the wear resistance of the diamond bit is (0.5-0.7) multiplied by 10-5The diamond sharpening and rock breaking are facilitated; the grinding aid is an auxiliary working body of the diamond drill bit, and compared with the main working body, the hardness of a matrix of the grinding aid is lower (HRC 6-10), and the wear resistance is lower (1.0-1.2) multiplied by 10-5Is easy to be worn, consumes less bit pressure, is favorable for applying the bit pressure on the main working body to improve the drilling speed, and simultaneously, the silicon carbide in the grinding-assistant body is caused by the matrixThe blade is worn out, which not only can play a role of assisting in breaking rock, but also the silicon carbide with the working capacity can play a role of wearing a main working body matrix, so that diamond blade is favorably carried out; therefore, the grinding aid plays a role in indirectly and assisting in breaking the rock; the main working body and the grinding aid act together, so that the drilling problem of hard and compact rock can be broken through.
(3) The diamond drill bit with the grinding aid structure for 3D printing is beneficial to being transplanted to the manufacturing of other diamond tools, such as: the manufacturing field of tools such as diamond grinding tools, diamond saw blades and the like.
(4) The invention adopts Selective Laser Melting (SLM) equipment to melt and form, and the selective laser melting equipment is rapidly heated and cooled; the post-treatment process is simple; the pre-alloy powder is completely melted into alloy under the action of the high-energy laser beam, the matrix structure of the formed diamond bit is compact, the mechanical property is stable and excellent, and the structure of the bit is reasonable and scientific; the selective laser melting and forming is beneficial to the metallurgical bonding of the pre-alloy powder and the surface of the diamond, thereby realizing the effective embedding of the diamond.
(5) The invention utilizes the process characteristics of selective laser melting and layer-by-layer and step-by-step manufacturing, can save some complicated links of the traditional processing method, can form diamond tools such as diamond drills with complex shapes and structures, and has high product precision; the manufacturing period can be shortened, and the production cost can be reduced.
Drawings
Figure 1 is a schematic representation of a diamond bit base lip surface containing a grinding aid structure according to the present invention.
Figure 2 is a schematic axial cross-section (i.e., cross-section a-a in figure 1) of a diamond drill bit containing a grinding aid structure according to the present invention.
Fig. 3 is a schematic view of a sector-shaped working body in fig. 1.
Fig. 4 is a flow chart of a technical route of a 3D printing method of a diamond drill bit containing a grinding aid structure according to the invention.
In the figure: 1-nozzle, 2-grinding aid body, 3-main working body, 4-drill steel body and 5-drill fan-shaped working body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1
Referring to fig. 1-3, the embodiment of the invention provides a diamond drill bit containing a grinding aid structure, the diamond drill bit comprises a plurality of main working bodies 3 and a plurality of grinding aid bodies 2 arranged in the main working bodies, and the grinding aid bodies 2 and the main working bodies 3 form a drill bit fan-shaped working body 5.
The main working bodies 3 are arranged at equal intervals along the circumferential direction of the bottom lip surface of the drill bit and are positioned at the edge of the bottom lip surface, the Rockwell hardness of the main working bodies 3 is HRC 12-25, and the wear resistance is ML (0.5-0.7) multiplied by 10-5The main working body 3 is connected with the adjacent main working body through a water gap 1.
The grinding assisting bodies 2 are arranged in the main working body 3 and are uniformly distributed, preferably, the grinding assisting bodies 2 are arranged on the radius of the bottom lip surface, the grinding assisting bodies 2 are arranged at equal intervals in the circumferential direction and the diameter direction, the grinding assisting bodies 2 are arranged on the main working body 3 from inside to outside in a multilayer mode, the number of the grinding assisting bodies 2 on the outer layer is not smaller than that of the grinding assisting bodies 2 on the inner layer, the total area of the cross sections of the grinding assisting bodies 2 is 30% -38% of the cross section area of the fan-shaped working body of the drill bit, the grinding assisting bodies 2 are cylinders, the diameters of the grinding assisting bodies 2 are 3-5 mm, the heights of the grinding assisting bodies 2 are 12-15 mm, the effective heights of the grinding assisting bodies 2 are equal to the height of the main working body 3, the Rockwell hardness of the grinding assisting bodies 2 is HRC 6-10, and the wear resistance is ML (-5。
The main working body 3 is the main body for breaking rock, and the grinding aid body 2 plays a role of assisting and indirectly breaking rock.
Referring to fig. 4, a 3D printing method for a diamond bit with a grinding aid structure includes a raw material and a method for 3D printing of a diamond bit with a grinding aid structure.
The raw materials for 3D printing included raw materials for the main working body and raw materials for the grinding aid.
The main working body comprises the following raw materials: the diamond-based composite material comprises diamond and pre-alloy powder, wherein the volume concentration of the diamond is 15% -25%, the grade of the diamond is SMD40 type, the granularity of the diamond is 30-180 meshes, the grain size of the pre-alloy powder is 82-127 microns, the pre-alloy powder in the raw materials of a main working body is FAM-103 type pre-alloy powder and FAM-201 type pre-alloy powder, the FAM-103 type pre-alloy powder accounts for 65-78%, the FAM-201 type pre-alloy powder accounts for 22-35%, the FAM-103 type pre-alloy powder accounts for Fe-80%, Ni-18% and Co-2%, the FAM-201 type pre-alloy powder accounts for Cu-60%, Ni-30%, Sn-10% and trace V, and the trace refers to the component with the content below ten thousandth and more than one million in the material.
The grinding-assistant body comprises the following raw materials: the grinding aid comprises silicon carbide and pre-alloy powder, wherein the volume concentration of the silicon carbide is 5% -12%, the granularity of the silicon carbide is 30-70 meshes, the particle size of the pre-alloy powder is 82-127 mu m, the pre-alloy powder in the raw materials of the grinding aid body comprises FAM-201 type pre-alloy powder and FAM-202 type pre-alloy powder, the FAM-201 type pre-alloy powder accounts for 60-70%, the FAM-202 type pre-alloy powder accounts for 30-40%, the FAM-201 type pre-alloy powder comprises Fe-60%, Cu-30%, Sn-10% and trace Ti, and the FAM-202 type pre-alloy powder comprises Cu-70%, Zn-30% and trace rare earth Y.
The 3D printing method comprises the following steps:
s1, uniformly mixing the raw materials of a main working body in a ball mill, and facilitating the dispersion and uniform distribution of diamond in pre-alloyed powder in the subsequent forming process;
s2, uniformly mixing the raw materials of the grinding aid body in a ball mill, and facilitating the silicon carbide to be uniformly dispersed in the pre-alloyed powder in the subsequent forming process;
s3, establishing a three-dimensional model of the drill bit on a computer, converting the three-dimensional model of the drill bit into an STL format and importing the STL format into 3D printing control software;
s4, respectively and sequentially forming the raw material of the main working body obtained in the step S1 and the raw material of the grinding-assistant body obtained in the step S2 on a bit body in laser selective melting equipment controlled by 3D printing control software;
feeding the raw materials of the main working body and the grinding-aid body into a feeding device of selective laser melting equipment, vacuumizing a forming cavity of the selective laser melting equipment, and introducing protective gas, preferably argon; then, the raw materials of the main working body and the raw materials of the grinding-assisting body are respectively and orderly conveyed to a drill bit body of the forming cavity under the control of 3D printing control software, and a drill bit is formed on the drill bit body;
the parameters of the drill bit formed by the selective laser melting equipment are as follows: the laser power is 160W-250W, the scanning speed is 300-900 mm/s, the scanning interval is 0.05 mm-0.08 mm, the powder spreading thickness is 0.2 mm-0.6 mm, and the powder spreading thickness corresponds to the granularity of diamond;
s5, taking out the formed drill bit together with the drill bit body, and performing stress relief annealing treatment on the formed drill bit, wherein the annealing temperature is 250-450 ℃, and the annealing time is 3-6 hours, so that microcracks are promoted to be effectively healed, and structural defects are eliminated; and obtaining the diamond drill bit containing the grinding aid structure.
Example 2
The difference between the embodiment and the embodiment 1 is only that the FAM-103 type pre-alloyed powder accounts for 68 percent, the FAM-201 type pre-alloyed powder accounts for 32 percent, the granularity of the diamond is 35-40 meshes, the grain diameter of the pre-alloyed powder is 127 mu m, and the volume concentration of the diamond is 22 percent; the FAM-201 type pre-alloyed powder accounts for 70 percent, the FAM-202 type pre-alloyed powder accounts for 30 percent, the granularity of the silicon carbide is 45 meshes to 50 meshes, and the volume concentration of the silicon carbide is 8 percent; the parameters of the forming drill of the selective laser melting equipment are as follows: the laser power is 220W, the scanning speed is 700mm/s, the scanning interval is 0.06mm, and the powder spreading thickness is 0.5 mm. The rest is basically the same as that of example 1.
Example 3
The difference between the embodiment and the embodiment 1 is only that the FAM-103 type pre-alloyed powder accounts for 72 percent, the FAM-201 type pre-alloyed powder accounts for 28 percent, the granularity of diamond is 50-60 meshes, the volume concentration of the diamond is 20 percent, and the grain diameter of the pre-alloyed powder is 80 mu m in the raw material of the main working body; the grinding aid raw material contains 65 percent of FAM-201 type pre-alloyed powder, 35 percent of FAM-202 type pre-alloyed powder, 50-60 meshes of silicon carbide, 10 percent of silicon carbide by volume concentration and 127 mu m of pre-alloyed powder particle size; the parameters of the forming drill of the selective laser melting equipment are as follows: the laser power is 200W, the scanning speed is 800mm/s, the scanning interval is 0.07mm, and the powder spreading thickness is 0.40 mm. The rest is basically the same as that of example 1.
The main working body of the diamond bit of the invention is the body of broken rock, and that of a common diamond bitCompared with the performance, the hardness is HRC 12-25, and the wear resistance is (0.5-0.7) multiplied by 10-5The diamond sharpening and rock breaking are facilitated; the grinding aid is an auxiliary working body of the diamond drill bit, and compared with the main working body, the hardness of a matrix of the grinding aid is lower (HRC 6-10), and the wear resistance is lower (1.0-1.2) multiplied by 10-5The silicon carbide in the grinding-aid body can not only play a role of assisting in breaking rocks, but also play a role of wearing the matrix of the main working body so as to be beneficial to diamond cutting; therefore, the grinding aid plays a role in indirectly and assisting in breaking the rock; the main working body and the grinding aid act together, so that the drilling problem of hard and compact rock can be broken through.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. The 3D printing method of the diamond drill bit with the grinding aid structure comprises a plurality of main working bodies arranged along the circumferential direction of the bottom lip surface of the drill bit and a plurality of grinding aid bodies arranged in the main working bodies, wherein the main working bodies are connected with adjacent main working bodies through water gaps, the grinding aid bodies are uniformly distributed in the main working bodies, the grinding aid bodies and the main working bodies form a fan-shaped working body of the drill bit, the total area of the cross section of each grinding aid body is 30-38% of the cross section area of the fan-shaped working body of the drill bit, and the grinding aid bodies are circlesThe cylinder, the main working body plays the effect of the broken rock of main part, the body that helps grinds plays the effect of supplementary and indirect broken rock, its characterized in that, the diamond bit that contains the grinding aid structure is printed by following raw materials 3D and is formed, the raw materials of main working body are: diamond and pre-alloyed powder, wherein the volume concentration of the diamond is 15-25%, and the grade of the diamond is SMD40The diamond particle size is 30-180 meshes, and the particle size of the pre-alloyed powder is 82-127 mu m; the grinding-assistant body comprises the following raw materials: the silicon carbide and the pre-alloy powder, wherein the volume concentration of the silicon carbide is 5-12%, the granularity of the silicon carbide is 30-70 meshes, and the grain size of the pre-alloy powder is 82-127 mu m.
2. The method for 3D printing of a diamond drill bit containing grinding aid structures as recited in claim 1 wherein the grinding aid bodies are arranged on a radius of the bottom lip face and the grinding aid bodies are equally spaced circumferentially and diametrically.
3. The method for 3D printing of a diamond bit containing grinding aid structures as recited in claim 1 wherein the main working body has a Rockwell hardness of HRC 12-25 and a wear resistance of ML (0.5-0.7) x 10-5The Rockwell hardness of the abrasion-assisting body is HRC 6-10, and the abrasion resistance is ML (1.0-1.2) x 10-5。
4. The 3D printing method of the diamond drill bit with the grinding aid structure is characterized in that prealloying powder in raw materials of the main working body is FAM-103 type prealloying powder and FAM-201 type prealloying powder, the FAM-103 type prealloying powder accounts for 65-78%, the FAM-201 type prealloying powder accounts for 22-35%, the FAM-103 type prealloying powder comprises Fe-80%, Ni-18% and Co-2%, the FAM-201 type prealloying powder comprises Cu-60%, Ni-30%, Sn-10% and V-trace; the prealloying powder in the raw materials of the grinding aid body is FAM-201 type prealloying powder and FAM-202 type prealloying powder, the FAM-201 type prealloying powder accounts for 60-70%, the FAM-202 type prealloying powder accounts for 30-40%, the FAM-201 type prealloying powder comprises Fe-60%, Cu-30%, Sn-10% and trace V, and the FAM-202 type prealloying powder comprises Cu-70%, Zn-30% and trace Y.
5. The method of 3D printing of a diamond drill bit containing grinding aid structures of claim 1, wherein the 3D printing method comprises the steps of:
s1, uniformly mixing raw materials of a main working body in a ball mill;
s2, uniformly mixing the raw materials of the grinding-assistant body in a ball mill;
s3, establishing a three-dimensional model of the drill bit on a computer, and importing the three-dimensional model of the drill bit into 3D printing control software;
s4, respectively forming the raw material of the main working body obtained in the step S1 and the raw material of the grinding-assistant body obtained in the step S2 on a bit body in laser selective melting equipment controlled by 3D printing control software;
s5, taking out the formed drill bit together with the drill bit body, and performing stress relief annealing treatment on the formed drill bit; and obtaining the diamond drill bit containing the grinding aid structure.
6. The 3D printing method for the diamond drill bit containing the grinding aid structure as recited in claim 5, wherein in step S4, the raw material of the main working body and the raw material of the grinding aid body are firstly fed into a feeding device of the selective laser melting equipment, a forming cavity of the selective laser melting equipment is vacuumized, and a shielding gas is introduced; and then the raw materials of the main working body and the raw materials of the grinding-assisting body are respectively and orderly conveyed to a drill bit body of the forming cavity under the control of 3D printing control software, and a drill bit is formed on the drill bit body.
7. The 3D printing method of a diamond drill bit containing a grinding aid structure as recited in claim 5 wherein the parameters of the selective laser melting device to shape the drill bit are: the laser power is 160W-250W, the scanning speed is 300-900 mm/s, the scanning interval is 0.05 mm-0.08 mm, and the powder spreading thickness is 0.2 mm-0.6 mm.
8. The 3D printing method for the diamond bit containing the grinding aid structure according to claim 5, wherein in the step S5, the annealing temperature of the stress relieving annealing treatment is 250-450 ℃, and the annealing time is 3-6 h.
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