CN107116490B - SHS preparation method of segment type diamond tool bit - Google Patents
SHS preparation method of segment type diamond tool bit Download PDFInfo
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- CN107116490B CN107116490B CN201710315112.XA CN201710315112A CN107116490B CN 107116490 B CN107116490 B CN 107116490B CN 201710315112 A CN201710315112 A CN 201710315112A CN 107116490 B CN107116490 B CN 107116490B
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- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 91
- 239000010432 diamond Substances 0.000 title claims abstract description 91
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 48
- 239000002245 particle Substances 0.000 claims abstract description 41
- 238000005245 sintering Methods 0.000 claims abstract description 38
- 238000002156 mixing Methods 0.000 claims abstract description 34
- 239000007767 bonding agent Substances 0.000 claims abstract description 24
- 238000007731 hot pressing Methods 0.000 claims abstract description 22
- 238000000498 ball milling Methods 0.000 claims abstract description 18
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical class [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000000227 grinding Methods 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 abstract description 26
- 239000011159 matrix material Substances 0.000 abstract description 21
- 229910018507 Al—Ni Inorganic materials 0.000 abstract description 16
- 229910045601 alloy Inorganic materials 0.000 abstract description 16
- 239000000956 alloy Substances 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000011230 binding agent Substances 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 18
- 238000001816 cooling Methods 0.000 description 17
- 229910000831 Steel Inorganic materials 0.000 description 13
- 239000010959 steel Substances 0.000 description 13
- 239000004568 cement Substances 0.000 description 12
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 229910002804 graphite Inorganic materials 0.000 description 8
- 239000010439 graphite Substances 0.000 description 8
- 238000000465 moulding Methods 0.000 description 7
- 238000005452 bending Methods 0.000 description 6
- 238000005219 brazing Methods 0.000 description 6
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 6
- 238000005056 compaction Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000004567 concrete Substances 0.000 description 6
- 238000011049 filling Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 239000006061 abrasive grain Substances 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000009766 low-temperature sintering Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
- B24D3/06—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
- B24D3/342—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/64—Burning or sintering processes
- C04B35/645—Pressure sintering
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
The invention relates to a SHS preparation method of a segment type diamond tool bit, belonging to the technical field of diamond tools. The preparation method comprises the steps of uniformly mixing a bonding agent and diamond to obtain a mixture; the mixture is subjected to cold pressing to obtain a cold-pressed blank body, the cold-pressed blank body is subjected to hot-pressing sintering to prepare the diamond tool bit, the hot-pressing sintering is carried out in two sections, and the cold-pressed blank body is firstly heated to 780-850 ℃ at 250-300 kgf/cm2Is maintained for 30 to 60 minutes under the pressure condition of (1), and then is cooled to 600 to 720 ℃ at 200 to 250kgf/cm2Is kept for 1.2 to 3.0 hours under the pressure condition (2). The binder comprises aluminum nickel alloy powder and hard phase particles for auxiliary grinding. The preparation method adopts a sintering system of low-temperature ball-milling Al-Ni alloy components, and introduces a sectional sintering process; not only improves the holding force of the matrix to the diamond and the hard phase particles, but also ensures that the abrasive resistance of the matrix is matched with the cutting edges of the diamond and the hard phase particles, and is beneficial to improving the cutting performance of the segment type diamond tool bit.
Description
Technical Field
The invention relates to the technical field of diamond tools, in particular to a SHS preparation method of a segmental diamond tool bit.
Background
The segment type diamond cutter is produced through powder metallurgy sintering process, which includes mixing diamond abrasive grain and metal powder, cold pressing to form, and hot pressing sintering in graphite mold. The diamond abrasive particles have the effect of being held by the consolidated bond, the sharpness of the tool depends on the height and speed of the diamond's edge, and is also subject to the abrasive properties of the sintered matrix. The segment tool bit prepared by the conventional production process often has the problem that the holding force of a matrix to diamond is inconsistent with the abrasion adaptability: namely, the high-density matrix sintered at high temperature has strong holding force on the diamond, but the high-density matrix has over-strong abrasive resistance, insufficient diamond edge, and insufficient sharpness; the abrasiveness of the low-temperature sintered tire body is weakened, but the wetting capacity of the low-temperature sintered tire body to diamond is insufficient, the holding force is reduced, the diamond is easy to peel off prematurely and lose efficacy, and the sharpness and the service life cannot be effectively guaranteed.
In the prior art, the grinding performance of the diamond tool is often improved by adding hard phase particles, but the added hard phase particles also need to ensure the holding force with a matrix to exert the efficacy. In order to simultaneously take into account the holding force of diamond and hard phase and develop a matrix matched with the holding force, further intensive research on a sintering system and a sintering process is often needed so as to improve the service performance and the service life of the segmented diamond cutter.
Disclosure of Invention
In order to give full play to the cutting performance of diamond and improve the sharpness of the diamond tool bit, the invention develops an SHS preparation method of a segment type diamond tool bit.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
an SHS preparation method of a segment type diamond tool bit comprises mixing bonding agent and diamond to obtain mixture; the mixture is subjected to cold pressing to obtain a cold-pressed green body, and the cold-pressed green body is subjected to hot-pressing sintering to prepare the sectional type diamond tool bit, and the sectional type diamond tool bit is characterized in that: the hot-pressing sintering is carried out in two sections, and the cold-pressed green body is heated to 780-850 ℃ and 250-300 kgf/cm2Is maintained for 30 to 60 minutes under the pressure condition of (1), and then is cooled to 600 to 720 ℃ at 200 to 250kgf/cm2Is kept for 1.2 to 3.0 hours under the pressure condition (2).
The bonding agent comprises aluminum-nickel alloy powder and hard phase particles for auxiliary grinding, wherein the aluminum-nickel alloy powder is obtained by cold mixing and ball milling of aluminum powder and nickel powder.
The aluminum nickel alloy powder is obtained by mixing and ball milling at the low temperature of below 50 ℃ below zero, preferably at the low temperature of below 100 ℃.
Wherein, the bonding agent also comprises metal element powder, and the metal element component is selected from at least one or more of Fe, Cu or Sn.
The bonding agent consists of aluminum nickel alloy powder, hard phase particles and the balance of metal element powder.
The bonding agent comprises 20-30% of aluminum nickel alloy powder, 1.0-20.0% of hard phase particles and the balance of metal element powder.
Wherein the hard phase particles are selected from at least one of WC, BN, SiC and SiN.
Wherein the atomic ratio of the aluminum powder to the nickel powder in the aluminum-nickel alloy powder is 1: 1-1: 3.
The second aspect of the invention also relates to a segment type diamond tool bit prepared by the SHS preparation method.
Compared with the closest prior art, the SHS preparation method of the segmental diamond tool bit has the following beneficial effects:
the preparation method adopts a sintering system containing a low-temperature ball-milling Al-Ni alloy component of self-propagating reaction, and introduces a sectional sintering process; not only improves the holding force of the tire body on the diamond and the hard phase particles, but also ensures that the abrasive resistance of the tire body is matched with the cutting edges of the diamond and the hard phase particles, is favorable for improving the cutting performance of the segment type diamond tool bit, and further can improve the sharpness and prolong the service life of the segment type diamond tool bit.
Drawings
FIG. 1 shows the particle size distribution of a low-temperature ball-milled Al-Ni alloy powder.
FIG. 2 shows the particle size distribution of room temperature ball-milled Al-Ni alloy powders.
Fig. 3 is a schematic view of a segmented diamond tip made in accordance with the present invention.
Detailed Description
The SHS manufacturing method for manufacturing segmented diamond segments according to the present invention will be further described with reference to the following embodiments, so as to provide a more complete and clear description of the technical solution of the present invention.
In order to ensure that the matrix has enough holding force on the diamond and hard phase particles and simultaneously has the abrasion adaptability with the diamond and hard phase particles in the saw blade bit, the sharpness of the tool is improved, and the service life is prolonged. The invention provides an SHS preparation method for preparing a segmented diamond tool bit. The preparation method adopts low-temperature ball milling of Al-Ni alloy components and hard phase particles for enhancing grinding ability in a sintering system of a traditional bonding agent, and introduces a sectional sintering process. On one hand, the fusion of the diamond and the hard phase particles with the matrix of the matrix is promoted by short high temperature in the first sintering stage, and the holding force of the diamond and the hard phase particles with the matrix is strengthened by the subsequent low-temperature sintering stage, and on the other hand, the duration of the high-temperature sintering stage is short, so that the abrasion resistance of the matrix is not too strong, the abrasion resistance of the matrix is matched with the cutting edges of the diamond and the hard phase particles, the cutting edges of the diamond particles and the grinding-out of the hard phase particles are facilitated, and the comprehensive efficiency of the diamond tool bit is better exerted.
Illustratively, the main operations for making a segmented diamond tip of the present invention are as follows: and (2) carrying out cold mixing ball milling on fine-grained aluminum powder (the grain diameter is less than or equal to 10 mu m) and carbonyl nickel powder in an atomic ratio of 1: 1-1: 3 under the protection of inert atmosphere at the temperature of below-50 ℃, wherein the ball milling is controlled to be below a specified temperature by using liquid nitrogen, dry ice and the like, the ball-material ratio is (8-10) to 1, and the ball milling time is 8-24 hours. Taking materials in inert protective atmosphere, and discharging with granularity less than 2 μm. Mixing the obtained low-temperature ball-milled Al-Ni alloy component with other metal element powder, hard phase particles (such as WC, BN, SiC and SiN) and diamond abrasive particles according to a formula proportion for 1.5-2.5 hours in a circular mixing barrel filled with nitrogen according to a preset proportion, uniformly mixing, then loading into a trough of an automatic cold press, and performing cold press molding in a steel die until the designed size of a blank body is reached. And assembling the cold-pressed green body in a graphite die, and carrying out hot-pressing sintering on a hot-pressing sintering machine. The hot-pressing sintering is carried out in two sections, firstly, the cold-pressed green body is heated to 780-850 ℃ and 250-300 kgf/cm2Is maintained for 30 to 60 minutes under the pressure condition of (1), and then is cooled to 600 to 720 ℃ at 200 to 250kgf/cm2Keeping the pressure for 1.2-3.0 hours, releasing pressure, cooling and taking a mold when the temperature is reduced to below 600 ℃, and disassembling the cutter head.
The manufacturing method of the present invention will be described in detail below by taking an example of manufacturing a segmented diamond tip (shown in fig. 3) having dimensions of 40mm (length) x 15mm (height) x 3.6mm (thickness) and 400mm (diameter).
Illustratively, the Al-Ni alloy composition in examples 1 to 2 of the present invention and comparative examples 1 to 2 was prepared by the following method:
performing cold mixing and ball milling on fine-grained aluminum powder (the grain diameter is less than or equal to 10 mu m) and carbonyl nickel powder in an atomic ratio of 1: 3 under the protection of argon at the temperature below-100 ℃, and preserving heat by using liquid nitrogen, wherein the ball-material ratio is 10: 1, the ball milling time is 20 hours, and thus obtaining a low-temperature Al-Ni alloy component with the grain diameter of less than 2 mu m, and the grain diameter distribution is shown in figure 1.
For comparison, the Al-Ni alloy compositions used in comparative examples 3 to 4 of the present invention were prepared by the following methods:
mixing and ball-milling fine-grained aluminum powder (the grain diameter is less than or equal to 10 mu m) and carbonyl nickel powder in an atomic ratio of 1: 3 under the protection of argon (normal temperature, no temperature control device), wherein the ball-material ratio is 10: 1, the ball-milling time is 20 hours, and the normal-temperature Al-Ni alloy component with the grain diameter less than 2 mu m is obtained, and the grain diameter distribution is shown in figure 2.
Example 1
The block type diamond tool bit is prepared by adopting a bonding agent of a formula system with the mass ratio of 43% of Fe, 15% of Cu, 2% of Sn, 30% (Al-Ni alloy component) and 10% of WC. Wherein Fe is carbonyl powder, Cu is 300-mesh electrolytic powder, Sn is 400-mesh atomized powder, and WC is 400-mesh powder. A segment diamond tool bit of phi 400mm with the specification of 40mm (length) multiplied by 15mm (height) multiplied by 3.6mm (thickness) is prepared. And (2) mixing a bonding agent and diamond abrasive particles (the volume concentration of the diamond abrasive particles is 43%, and the volume concentration percentage refers to a relative percentage value relative to the international concentration standard of diamond products) in a circular mixing barrel filled with nitrogen for 1.5-2.5 hours, uniformly mixing, then filling in a trough of an automatic cold press, and performing cold press molding in a steel die to reach the designed size of a blank, wherein the compaction density of the cold-pressed blank is 80% of the theoretical density. Assembling the cold-pressed blank in a graphite die, carrying out hot-pressing sintering on a hot-pressing sintering machine at the temperature of 780-850 ℃ under 300kgf/cm2Is maintained under the pressure of (1) for 30 minutes, and then cooled to 680 ℃ at 220kgf/cm2Keeping the pressure for 3.0 hours, cooling to 600 ℃, then unloading, cooling and taking the die, and disassembling the tool bit. The sintering density of the tool bit is 99.1 percent, the hardness is HRB103, and the bending strength is 860 MPa. And brazing the cutter head on the steel matrix to prepare the finished saw blade. The saw blade is arranged on a hand-push type cement cutting machine to cut a C25 cement concrete pavement (without cobblestones) with the thickness of 80mm, and the pavement is cut by water cooling. The average cutting speed of the saw blade was 3.8m/min and the cutting life was 2231 m.
Example 2
The block-type diamond tool bit is prepared by adopting a bonding agent of a formula system with the mass ratio of 50% of Fe, 18% of Cu, 2% of Sn, 20% (Al-Ni alloy component) and 10% of WC. Wherein Fe is carbonyl powder, Cu is 300-mesh electrolytic powder, Sn is 400-mesh atomized powder, and WC is 400-mesh powder. A segment diamond tool bit of phi 400mm with the specification of 40mm (length) multiplied by 15mm (height) multiplied by 3.6mm (thickness) is prepared. And (2) mixing a bonding agent and diamond abrasive particles (the volume concentration of the diamond abrasive particles is 43%, and the volume concentration percentage refers to a relative percentage value relative to the international concentration standard of diamond products) in a circular mixing barrel filled with nitrogen for 1.5-2.5 hours, uniformly mixing, then filling in a trough of an automatic cold press, and performing cold press molding in a steel die to reach the designed size of a blank, wherein the compaction density of the cold-pressed blank is 80% of the theoretical density. Assembling the cold-pressed blank in a graphite die, carrying out hot-pressing sintering on a hot-pressing sintering machine at 780-820 ℃ under 280kgf/cm2Is maintained under the pressure of (1) for 50 minutes, and then cooled to 680 ℃ at 220kgf/cm2Keeping for 2.5 hours under the pressure condition, then cooling to 600 ℃, then unloading, cooling and taking the die, and disassembling the tool bit. The sintered density of the tool bit is 98.8 percent, the hardness is HRB101, and the bending strength is 850 MPa. And brazing the cutter head on the steel matrix to prepare the finished saw blade. The saw blade is arranged on a hand-push type cement cutting machine to cut a C25 cement concrete pavement (without cobblestones) with the thickness of 80mm, and the pavement is cut by water cooling. The average cutting speed of the saw blade was 4.0m/min and the cutting life was 2176 meters.
Comparative example 1
The block type diamond tool bit is prepared by adopting a bonding agent of a formula system with the mass ratio of 43% of Fe, 15% of Cu, 2% of Sn, 30% (Al-Ni alloy component) and 10% of WC. Wherein Fe is carbonyl powder, Cu is 300 meshesElectrolytic powder, Sn is 400 mesh atomized powder, WC is 400 mesh powder. A segment diamond tool bit of phi 400mm with the specification of 40mm (length) multiplied by 15mm (height) multiplied by 3.6mm (thickness) is prepared. And (2) mixing a bonding agent and diamond abrasive particles (the volume concentration of the diamond abrasive particles is 43%, and the volume concentration percentage refers to a relative percentage value relative to the international concentration standard of diamond products) in a circular mixing barrel filled with nitrogen for 1.5-2.5 hours, uniformly mixing, then filling in a trough of an automatic cold press, and performing cold press molding in a steel die to reach the designed size of a blank, wherein the compaction density of the cold-pressed blank is 80% of the theoretical density. Assembling the cold-pressed blank in a graphite die, carrying out hot-pressing sintering on a hot-pressing sintering machine at the temperature of 780-850 ℃ under 300kgf/cm2Keeping for 3 hours under the pressure condition, then cooling to 600 ℃, then unloading, cooling and taking the die, and disassembling the tool bit. The sintering density of the tool bit is 99.2 percent, the hardness is HRB108, and the bending strength is 850 MPa. And brazing the cutter head on the steel matrix to prepare the finished saw blade. The saw blade is arranged on a hand-push type cement cutting machine to cut a C25 cement concrete pavement (without cobblestones) with the thickness of 80mm, and the pavement is cut by water cooling. The average cutting speed of the saw blade is 3.5m/min, and the cutting life is 2166 meters.
Comparative example 2
The block-type diamond tool bit is prepared by adopting a bonding agent of a formula system with the mass ratio of 50% of Fe, 18% of Cu, 2% of Sn, 20% (Al-Ni alloy component) and 10% of WC. Wherein Fe is carbonyl powder, Cu is 300-mesh electrolytic powder, Sn is 400-mesh atomized powder, and WC is 400-mesh powder. A segment diamond tool bit of phi 400mm with the specification of 40mm (length) multiplied by 15mm (height) multiplied by 3.6mm (thickness) is prepared. And (2) mixing a bonding agent and diamond abrasive particles (the volume concentration of the diamond abrasive particles is 43%, and the volume concentration percentage refers to a relative percentage value relative to the international concentration standard of diamond products) in a circular mixing barrel filled with nitrogen for 1.5-2.5 hours, uniformly mixing, then filling in a trough of an automatic cold press, and performing cold press molding in a steel die to reach the designed size of a blank, wherein the compaction density of the cold-pressed blank is 80% of the theoretical density. Assembling the cold-pressed blank in a graphite die, carrying out hot-pressing sintering on a hot-pressing sintering machine at 780-820 ℃ under 280kgf/cm2Is kept for 3 hours under the pressure condition, then is cooled to 600 ℃, is unloaded, cooled and taken out of the mold, and is disassembledA cutter head. The sintering density of the tool bit is 99.0 percent, the hardness is HRB103, and the bending strength is 850 MPa. And brazing the cutter head on the steel matrix to prepare the finished saw blade. The saw blade is arranged on a hand-push type cement cutting machine to cut a C25 cement concrete pavement (without cobblestones) with the thickness of 80mm, and the pavement is cut by water cooling. The average cutting speed of the saw blade is 3.6m/min, and the cutting life is 2098 m.
Comparative example 3
The block type diamond tool bit is prepared by adopting a bonding agent of a formula system with the mass ratio of 43% of Fe, 15% of Cu, 2% of Sn, 30% (Al-Ni alloy component) and 10% of WC. Wherein Fe is carbonyl powder, Cu is 300-mesh electrolytic powder, Sn is 400-mesh atomized powder, and WC is 400-mesh powder. A segment diamond tool bit of phi 400mm with the specification of 40mm (length) multiplied by 15mm (height) multiplied by 3.6mm (thickness) is prepared. And (2) mixing a bonding agent and diamond abrasive particles (the volume concentration of the diamond abrasive particles is 43%, and the volume concentration percentage refers to a relative percentage value relative to the international concentration standard of diamond products) in a circular mixing barrel filled with nitrogen for 1.5-2.5 hours, uniformly mixing, then filling in a trough of an automatic cold press, and performing cold press molding in a steel die to reach the designed size of a blank, wherein the compaction density of the cold-pressed blank is 80% of the theoretical density. Assembling the cold-pressed blank in a graphite die, carrying out hot-pressing sintering on a hot-pressing sintering machine at the temperature of 780-850 ℃ under 300kgf/cm2Is maintained under the pressure of (1) for 30 minutes, and then cooled to 680 ℃ at 220kgf/cm2Keeping the pressure for 3.0 hours, cooling to 600 ℃, then unloading, cooling and taking the die, and disassembling the tool bit. The sintering density of the tool bit is 95.7 percent, the hardness HRB is 100, and the bending strength is 850 MPa. And brazing the cutter head on the steel matrix to prepare the finished saw blade. The saw blade is arranged on a hand-push type cement cutting machine to cut a C25 cement concrete pavement (without cobblestones) with the thickness of 80mm, and the pavement is cut by water cooling. The average cutting speed of the saw blade was 3.9m/min, and the cutting life was 1931 m.
Comparative example 4
The block-type diamond tool bit is prepared by adopting a bonding agent of a formula system with the mass ratio of 50% of Fe, 18% of Cu, 2% of Sn, 20% (Al-Ni alloy component) and 10% of WC. Wherein Fe is carbonyl powder, Cu is 300-mesh electrolytic powder, Sn is 400-mesh atomized powder, and WC is 400-mesh powder. Preparation size of 40mm (length)) Segment diamond tool bit of phi 400mm in thickness of 15mm in height and 3.6mm in thickness. And (2) mixing a bonding agent and diamond abrasive particles (the volume concentration of the diamond abrasive particles is 43%, and the volume concentration percentage refers to a relative percentage value relative to the international concentration standard of diamond products) in a circular mixing barrel filled with nitrogen for 1.5-2.5 hours, uniformly mixing, then filling in a trough of an automatic cold press, and performing cold press molding in a steel die to reach the designed size of a blank, wherein the compaction density of the cold-pressed blank is 80% of the theoretical density. Assembling the cold-pressed blank in a graphite die, carrying out hot-pressing sintering on a hot-pressing sintering machine at 780-820 ℃ under 280kgf/cm2Is maintained under the pressure of (1) for 50 minutes, and then cooled to 680 ℃ at 220kgf/cm2Keeping for 2.5 hours under the pressure condition, then cooling to 600 ℃, then unloading, cooling and taking the die, and disassembling the tool bit. The sintered density of the tool bit is 94.9 percent, the hardness is HRB98, and the bending strength is 870 MPa. And brazing the cutter head on the steel matrix to prepare the finished saw blade. The saw blade is arranged on a hand-push type cement cutting machine to cut a C25 cement concrete pavement (without cobblestones) with the thickness of 80mm, and the pavement is cut by water cooling. The average cutting speed of the saw blade was 4.2m/min, and the cutting life was 1857 m.
Although the examples only illustrate a low temperature ball milling composition and a segment diamond segment of a certain size, the technical effect better than that of the ordinary room temperature ball milling can be obtained as long as the molar ratio of the aluminum powder to the nickel powder is maintained within the range defined in the summary of the invention, and the temperature of the cold mixing ball milling is controlled to be below-50 ℃. And similarly, the addition of other hard phase particles in the range required by the invention can help to improve the grinding renewal, so that the abrasion resistance of the matrix to the reinforced concrete can be matched with the cutting speed of the diamond through the two-step sintering process, and the service life is prolonged.
It is obvious to those skilled in the art that the present invention is not limited to the above embodiments, and it is within the scope of the present invention to adopt various insubstantial modifications of the method concept and technical scheme of the present invention, or to directly apply the concept and technical scheme of the present invention to other occasions without modification.
Claims (7)
1. An SHS preparation method of a segment type diamond tool bit comprises mixing bonding agent and diamond to obtain mixture; the mixture is subjected to cold pressing to obtain a cold-pressed green body, and the cold-pressed green body is subjected to hot-pressing sintering to prepare the sectional type diamond tool bit, and the sectional type diamond tool bit is characterized in that: the hot-pressing sintering is carried out in two sections, and the cold-pressed green body is heated to 780-850 ℃ and 250-300 kgf/cm2Is maintained for 30 to 60 minutes under the pressure condition of (1), and then is cooled to 600 to 720 ℃ at 200 to 250kgf/cm2Is kept for 1.2 to 3.0 hours under the pressure condition; the bonding agent comprises aluminum nickel alloy powder and hard phase particles for auxiliary grinding, wherein the hard phase particles are selected from at least one of WC, BN, SiC and SiN; the aluminum-nickel alloy powder is obtained by cold mixing and ball milling of aluminum powder and nickel powder, and is obtained by mixing and ball milling of the aluminum-nickel alloy powder in a low-temperature environment below-50 ℃.
2. The SHS manufacturing method of a segmented diamond segment according to claim 1, wherein: the aluminum-nickel alloy powder is obtained by mixing and ball milling at the low temperature of below-100 ℃.
3. The SHS manufacturing method of a segmented diamond segment according to claim 1, wherein: the bonding agent also comprises metal element powder, and the metal elements comprise Fe, Cu and Sn.
4. The SHS manufacturing method of a segmented diamond segment according to claim 1, wherein: the bonding agent consists of aluminum nickel alloy powder, hard phase particles and the balance of metal element powder.
5. The SHS manufacturing method of a segmented diamond segment according to claim 4, wherein: the bonding agent consists of 20-30% of aluminum-nickel alloy powder, 1.0-20.0% of hard phase particles and the balance of metal element powder.
6. The SHS manufacturing method of a segmented diamond segment according to claim 1, wherein: the atomic ratio of the aluminum powder to the nickel powder in the aluminum-nickel alloy powder is 1: 1-1: 3.
7. A segment type diamond tool bit is characterized in that: prepared by the SHS preparation method of any one of claims 1 to 6.
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| CN109986082B (en) * | 2017-12-29 | 2021-02-09 | 江苏友和工具有限公司 | Preparation method of diamond tool based on iron agent matrix and binding agent |
| CN110125820B (en) * | 2019-04-17 | 2022-03-11 | 江苏友美工具有限公司 | Diamond grinding disc and preparation method thereof |
| CN110026913B (en) * | 2019-04-17 | 2022-03-11 | 江苏友美工具有限公司 | Diamond grinding tool bit and preparation method thereof |
| CN111571465B (en) * | 2019-04-17 | 2021-07-06 | 江苏友美工具有限公司 | Hard concrete grinding disc and preparation method thereof |
| CN112621580B (en) * | 2020-12-17 | 2022-08-26 | 广东纳德新材料有限公司 | Composite diamond grinding block and preparation method thereof |
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