CN110026913B - Diamond grinding tool bit and preparation method thereof - Google Patents
Diamond grinding tool bit and preparation method thereof Download PDFInfo
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- CN110026913B CN110026913B CN201910310705.6A CN201910310705A CN110026913B CN 110026913 B CN110026913 B CN 110026913B CN 201910310705 A CN201910310705 A CN 201910310705A CN 110026913 B CN110026913 B CN 110026913B
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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
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- 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
- B24D3/10—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 for porous or cellular structure, e.g. for use with diamonds as abrasives
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- 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
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- 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
- B24D3/346—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 utilised during polishing, or grinding operation
Abstract
The invention relates to a diamond grinding tool bit and a preparation method thereof, belonging to the technical field of diamond tools. The horizontal projection of the diamond grinding tool bit is in an arc shape formed by concentric outer arc edges, inner arc edges and two side edges connecting the outer arc edges and the inner arc edges, and the two side edges are parallel to each other; the central angle of the outer circular arc edge and the inner circular arc edge is less than or equal to 20 degrees, and the grinding tool bit is formed by cold pressing and sintering mixed powder consisting of metal bonding agent containing tungsten carbide, diamond particles, graphite particles and metal halide additive. The diamond grinding tool bit disclosed by the invention has good sharpness and good stability under the condition of high-speed rotation grinding, can obviously improve the grinding quality, and is beneficial to reducing the surface roughness and the surface flatness.
Description
Technical Field
The invention relates to the technical field of diamond tools, in particular to a diamond grinding tool bit and a preparation method thereof.
Background
Diamond abrasive tools are a generic term for abrasive articles having a certain geometry, which are bonded with various bonding agents (mainly including metals, ceramics, and resins) using diamond particles as abrasive grains. The diamond grinding tool can be used for efficiently grinding various processing materials such as hard alloy, glass, ceramics, concrete, stone and the like, and the service life of a grinder is longest. In recent decades, along with the development of the technology of 'high, fine and sharp', the processing requirements of the grinding tool are more and more strict, and along with the development and application of the diamond mould, the diamond mould is widely developed and applied, so that the diamond mould not only takes an irreplaceable leading position in the field of difficult-to-process materials, but also takes remarkable development in the field of common abrasive processing (silicon carbide, corundum and the like).
Because the diamond abrasive has mechanical properties such as high hardness, high strength, excellent wear resistance and the like, the diamond abrasive particles have small changes in size, shape and appearance in grinding processing, and the grinding quality is better. And the abrasive particles of the diamond grinding tool can keep good micro-blade property for a long time, the good cutting performance ensures smaller grinding force in the grinding process, the friction heat is obviously reduced, and the surface of a workpiece can be prevented from being burnt and cracked. For processing of concrete and other pavements, diamond particles with the granularity level of 45/50-100/120 meshes are usually selected to ensure grinding efficiency, but with the gradual improvement of the requirements of construction standards, a conventional diamond grinding disc is adopted to grind the concrete pavement with high-level requirements, particularly the concrete pavement with high requirements on surface roughness and flatness, the condition of repair and rework is often caused due to the fact that the construction requirements cannot be met, so that the construction efficiency is low, the consumption of grinding tools is increased, and the labor cost is also obviously increased.
Disclosure of Invention
In order to reduce the roughness level of the polished surface and improve the surface flatness, the invention aims to provide a diamond grinding tool bit and a preparation method thereof.
In order to achieve the above object, the first aspect of the present invention employs the following technical solutions:
a diamond grinding tool bit is characterized in that the horizontal projection of the grinding tool bit is in an arc surface shape formed by an outer arc edge, an inner arc edge and two side edges connecting the outer arc edge and the inner arc edge which are concentric, and the two side edges are parallel to each other; the method is characterized in that: the central angle of the outer circular arc edge and the inner circular arc edge is less than or equal to 20 degrees, and the grinding tool bit is formed by cold pressing and sintering mixed powder consisting of metal bonding agent containing tungsten carbide, diamond particles, graphite particles and metal halide additive.
Wherein the content of the diamond particles is 1.4-2.1% of the weight of the metal bond. The particle size of the diamond particles is 0.125-0.425 mm.
Wherein the content of the graphite particles is 0.25-1.0% of the weight of the metal binder. The particle size of the graphite particles is 5.0-200 mu m.
Wherein the content of the metal halide additive is 0.10-0.50% of the weight of the metal bonding agent. The metal halide additive is selected from CoCl2、LaF3、CeF3NaF or CaF2Preferably CoCl2。
The metal binder may be selected from a commonly used iron-based metal binder, or may be selected from an iron-based pre-alloyed powder, and is not particularly limited in the present invention. For example, comprising: 30-45 wt% of Fe, 20-32 wt% of Cu, 5-15 wt% of Ni, 13-23 wt% of WC and 2-10 wt% of Sn.
Preferably, the metal binder contains: 35-39 wt% of Fe, 24-30 wt% of Cu, 5-15 wt% of Ni, 13-23 wt% of WC and 2-10 wt% of Sn.
Wherein the iron-based metal binder optionally further comprises not more than 15 wt% of Co, Al, Mn, Ag, Zn, Cr, Ti, Mo in total, and each element is added in an amount of not more than 3 wt%.
The second aspect of the invention also relates to a preparation method of the diamond grinding tool bit.
The preparation method comprises the following steps:
(1) preparing a metal bonding agent containing tungsten carbide, diamond particles, graphite particles and a metal halide additive, and uniformly mixing to obtain mixed powder;
(2) carrying out cold press molding on the mixed powder in a die to obtain a cutter head blank;
(3) carrying out hot-pressing sintering molding on the tool bit blank, wherein the hot-pressing sintering temperature is 780-850 ℃, and the pressure is 200-300kg/cm2And the hot press sintering is performed in an oxygen-deficient atmosphere.
Wherein the oxygen-deficient atmosphere is an atmosphere containing 1 to 20% by volume of air and the balance of nitrogen.
Compared with the closest prior art, the diamond grinding tool bit of the invention has the following beneficial effects:
the diamond grinding tool bit disclosed by the invention has good sharpness and good stability under the condition of high-speed rotation grinding, can obviously improve the grinding quality, and is beneficial to reducing the surface roughness and the surface flatness.
Drawings
Fig. 1 is a schematic view of the construction of a diamond abrasive tool tip of the present invention.
Fig. 2 is a schematic view of a grinding disc to which the diamond grinder tip of the present invention is applied.
Detailed Description
The diamond mold tip and the method for making the same according to the present invention will be further described with reference to the following embodiments, in order to more fully and clearly illustrate the technical solution of the present invention.
In order to improve the quality of the surface to be ground of hard workpieces, such as hard concrete, rock, etc., under high-speed rotating working conditionsA diamond abrasive tool tip is provided. The horizontal projection of the grinding tool bit is in an arc shape formed by an outer arc edge, an inner arc edge and two side edges connecting the outer arc edge and the inner arc edge, and the two side edges are parallel to each other. FIG. 1 is a schematic perspective view of a diamond tool bit of the present invention having an outer arc surface with a radius R1The radius of the inner arc surface is R2And the length of the outer arc surface is less than or equal to pi R19, the length of the inner and outer arc surfaces is less than or equal to pi R2And 9, further enabling the central angle of the outer circular arc edge and the inner circular arc edge to be less than or equal to 20 degrees. When the tool tip with the shape and the radian shown in fig. 1 is applied to the diamond grinding disc shown in fig. 2, the stability under the high-speed grinding condition is improved, and the flatness and the surface roughness of the ground surface are improved.
In the invention, the grinding tool bit is formed by cold pressing and hot pressing sintering of mixed powder consisting of a metal bond containing tungsten carbide, diamond particles, graphite particles and a metal halide additive. As an example, the preparation method may comprise the steps of: (1) preparing a metal bonding agent containing tungsten carbide, diamond particles, graphite particles and a metal halide additive, and uniformly mixing to obtain mixed powder; (2) carrying out cold press molding on the mixed powder in a die to obtain a cutter head blank; (3) carrying out hot-pressing sintering molding on the tool bit blank, wherein the hot-pressing sintering temperature is 780-850 ℃, and the pressure is 200-300kg/cm2And the hot press sintering is performed in an oxygen-deficient atmosphere. The oxygen-deficient atmosphere means an atmosphere containing 1 to 20% by volume of air and the balance of nitrogen. The hot-pressing sintering is carried out in the oxygen-deficient atmosphere, on one hand, partial graphite particles can be subjected to oxidation reaction to form pores, the grindability of the matrix can be weakened, the porosity of the tool bit of the grinding tool is improved, the rapid edge emergence of diamond in the matrix is facilitated, and the sharpness of the grinding disc is improved.
In the invention, the added graphite can form a lubricating film on the surface of the diamond, the lubricating property of the contact between the diamond and a grinding object is improved, the heat dissipation of a tool bit is improved, and the graphite can be promoted to be sintered in a hot pressing mode in an oxygen-deficient atmosphere by adding the metal halide additive in the inventionThe transfer film layer is formed on the working surface of the diamond, and specifically, in the invention, the content of the metal halide additive is 0.10-0.50% of the weight of the metal bonding agent. When the addition amount of the metal halide is less than 0.10%, the effect of improving the formation of the transfer film layer by graphite is small, and when the content exceeds 0.50%, the effect of promoting the transfer of graphite to form a complete transfer film layer is saturated. The metal halide additive is selected from CoCl2、LaF3、CeF3NaF or CaF2Preferably CoCl2。
In the present invention, the content of the diamond particles is a conventional addition amount, and is generally 1.4 to 2.1% by weight of the metal bond. The diamond particles have a particle size of 0.125 to 0.425mm, corresponding to a grade of 35/45 to 100/120 of diamond particles. In the invention, the content of the graphite particles is 0.25-1.0% of the weight of the metal binder. The particle size of the graphite particles is 5.0-200 mu m.
In the present invention, the metal binder may be selected from a conventional iron-based metal binder, and may also be selected from an iron-based pre-alloyed powder, which is not particularly limited in the present invention. For example, comprising: 30-45 wt% of Fe, 20-32 wt% of Cu, 5-15 wt% of Ni, 13-23 wt% of WC and 2-10 wt% of Sn. Preferably, the metal binder contains: 35-39 wt% of Fe, 24-30 wt% of Cu, 5-15 wt% of Ni, 13-23 wt% of WC and 2-10 wt% of Sn. Alternatively, it is also possible to contain Co, Al, Mn, Ag, Zn, Cr, Ti, Mo in an amount of not more than 15 wt% in total, and the addition amount of each element is not more than 3 wt%, and the physical properties such as strength, toughness and the like of the carcass can be adjusted by adding the above components.
In the following examples and comparative examples, in order to facilitate comparison of sintering properties of the mixed powders, respective grinding tool bits of the same shape as in FIG. 1 were prepared, in which the radius R of the outer arc surface was1Is 125mm, and the radius R of the inner arc surface2Approximately 110mm, an H value of 5mm, a W value of 15mm and an L value of 35 mm. The metal bond and diamond particles (particle size 40/45, compressive strength in the following examples and comparative examples)25kg), graphite particles (average particle size of 35 μm in the following examples and comparative examples) and a metal halide additive (average particle size of 30 μm in the following examples and comparative examples), were weighed, mixed, cold-pressed, sintered by hot pressing, and sanded to prepare diamond tips.
Example 1
Taking 3.2kg of copper powder, 3.2kg of iron, 0.8kg of nickel, 2kg of tungsten carbide and 0.8kg of tin, putting the copper powder, the iron, the nickel, the tungsten carbide and the tin into a mixing barrel, mixing for 30 minutes, and adding 0.08kg of graphite particles and CoCl20.02kg of diamond and 0.15kg of diamond, continuously mixing for 2 hours, filling the powder into a die for cold press molding, hot press sintering, wherein the hot press sintering temperature is 850 ℃, and the pressure is 220kg/cm2The heat preservation time is 5 minutes, the sintering atmosphere comprises 10 v% of air, and the balance is N2。
Example 2
2.5kg of copper powder, 4.1kg of iron, 1.5kg of nickel, 1.5kg of tungsten carbide and 0.4kg of tin are taken and put into a mixing barrel to be mixed for 30 minutes, and then 0.08kg of graphite particles and LaF are added30.03kg of diamond and 0.15kg of diamond, continuously mixing for 2 hours, filling the powder into a die for cold press molding, hot press sintering, wherein the hot press sintering temperature is 850 ℃, and the pressure is 220kg/cm2The heat preservation time is 5 minutes, the sintering atmosphere comprises 20 v% of air, and the balance is N2。
Example 3
2.7kg of copper powder, 3.9kg of iron, 1.2kg of nickel, 1.7kg of tungsten carbide, 0.4kg of tin and 0.1kg of zinc are put into a mixing barrel to be mixed for 30 minutes, and then 0.08kg of graphite particles and CeF are added30.03kg of diamond and 0.15kg of diamond, continuously mixing for 2 hours, filling the powder into a die for cold press molding, hot press sintering, wherein the hot press sintering temperature is 850 ℃, and the pressure is 220kg/cm2The heat preservation time is 5 minutes, the sintering atmosphere comprises 5 v% of air, and the balance is N2。
Example 4
2.7kg of copper powder, 3.9kg of iron, 1.2kg of nickel, 1.7kg of tungsten carbide and 0.5kg of tin are taken and put into a mixing barrel to be mixed for 30 minutes, 0.08kg of graphite particles, 0.03kg of NaF0 and 0.15kg of diamond are added, the materials are continuously mixed for 2 hours, then the powder is poured into a die to be cold-pressed and molded, hot-pressed and sintered, the hot-pressed sintering temperature is 850 ℃, and the pressure is 220kg/cm2The heat preservation time is 5 minutesThe sintering atmosphere comprises 10 v% of air and the balance of N2。
Example 5
2.7kg of copper powder, 3.9kg of iron, 1.2kg of nickel, 1.7kg of tungsten carbide and 0.5kg of tin are taken and put into a mixing barrel to be mixed for 30 minutes, and then 0.08kg of graphite particles and CaF are added20.03kg of diamond and 0.15kg of diamond, continuously mixing for 2 hours, filling the powder into a die for cold press molding, hot press sintering, wherein the hot press sintering temperature is 850 ℃, and the pressure is 220kg/cm2The heat preservation time is 5 minutes, the sintering atmosphere comprises 10 v% of air, and the balance is N2。
Comparative example 1
2.7kg of copper powder, 3.9kg of iron, 1.2kg of nickel, 1.7kg of tungsten carbide and 0.5kg of tin are taken and put into a mixing barrel to be mixed for 30 minutes, 0.08kg of graphite particles and 0.15kg of diamond are added, the mixture is continuously mixed for 2 hours, then the powder is poured into a die to be cold-pressed and molded, hot-pressed and sintered, the hot-pressed sintering temperature is 850 ℃, and the pressure is 220kg/cm2The heat preservation time is 5 minutes, and the sintering atmosphere is air.
Comparative example 2
2.7kg of copper powder, 3.9kg of iron, 1.2kg of nickel, 1.7kg of tungsten carbide and 0.5kg of tin are taken and put into a mixing barrel to be mixed for 30 minutes, 0.08kg of graphite particles and 0.15kg of diamond are added, the mixture is continuously mixed for 2 hours, then the powder is poured into a die to be cold-pressed and molded, hot-pressed and sintered, the hot-pressed sintering temperature is 850 ℃, and the pressure is 220kg/cm2The heat preservation time is 5 minutes, the sintering atmosphere comprises 10 v% of air, and the balance is N2。
Comparative example 3
Taking 3.2kg of copper powder, 3.2kg of iron, 0.8kg of nickel, 2kg of tungsten carbide and 0.8kg of tin, putting the copper powder, the iron, the nickel, the tungsten carbide and the tin into a mixing barrel, mixing for 30 minutes, and adding 0.08kg of graphite particles and CoCl20.02kg of diamond and 0.15kg of diamond, continuously mixing for 2 hours, filling the powder into a die for cold press molding, hot press sintering, wherein the hot press sintering temperature is 850 ℃, and the pressure is 220kg/cm2The heat preservation time is 5 minutes, and the sintering atmosphere is air.
Comparative example 4
2.5kg of copper powder, 4.1kg of iron, 1.5kg of nickel, 1.5kg of tungsten carbide and 0.4kg of tin are taken and put into a mixing barrel to be mixed for 30 minutes, and then 0.08kg of graphite particles and LaF are added30.03kg，0.15kg of diamond, continuously mixing for 2 hours, filling the powder into a die for cold press molding, and hot press sintering at 850 ℃ under the pressure of 220kg/cm2The heat preservation time is 5 minutes, and the sintering atmosphere is air.
Comparative example 5
2.7kg of copper powder, 3.9kg of iron, 1.2kg of nickel, 1.7kg of tungsten carbide, 0.4kg of tin and 0.1kg of zinc are put into a mixing barrel to be mixed for 30 minutes, and then 0.08kg of graphite particles and CeF are added30.03kg of diamond and 0.15kg of diamond, continuously mixing for 2 hours, filling the powder into a die for cold press molding, hot press sintering, wherein the hot press sintering temperature is 850 ℃, and the pressure is 220kg/cm2The heat preservation time is 5 minutes, and the sintering atmosphere is air.
Grinding tool bits of the grinding tool obtained by the embodiment and the proportional sintering are ground by adopting a grinding wheel abrasive belt, the tool bits and silver soldering pieces are placed on a 65Mn steel substrate with the diameter of 250mm together according to the position shown in figure 2, the welding position is adjusted, the silver soldering pieces are heated and melted, the tool bits and the substrate are welded together, and then 600N/mm is used for welding2The strength standard is used for detecting the welding strength of each diamond tool bit, the welded diamond grinding disc is used for removing oxide skin on the surface of a base body caused by welding by a sand blasting machine, then the working surface of each diamond tool bit is ground by a grinding wheel, and diamonds are exposed to obtain the diamond grinding discs of the examples and the comparative examples.
The grinding tests were carried out by dry grinding a cement concrete pavement having a strength grade of C55 (plunge forward grinding, 0.2mm depth of cut, 5000r/min) using a diamond disc made of the grinding tool tips of examples 1 to 5 and comparative examples 1 to 5 mounted on a grinding machine.
And randomly selecting a 1m multiplied by 1m test pavement to carry out surface roughness and flatness test. Selecting a central plane of 100mm multiplied by 10mm on a test road surface to test roughness, cutting 10 longitudinal sections with the length of the side of the central plane at a distance of 10mm, drawing a concave-convex curve by a contact pin for roughness measurement along the length direction of the ith longitudinal section, drawing a horizontal line parallel to the cross section through the highest point of the section, wherein the area enclosed by the horizontal line and the concave-convex curve is AiThe surface roughness of the ith longitudinal section is Ai100mm, and then taking the average value of the surface roughness of the 10 longitudinal sections as the measured surface roughness. And cutting longitudinal sections on the 1m multiplied by 1m test pavement along the side length at a distance of 0.1m, taking 10 longitudinal sections in total, drawing a concave curve along the length direction of the ith longitudinal section by using a contact pin, wherein the distance between the highest point and the lowest point of the concave curve is the flatness value of the ith longitudinal section, and then taking the average value of the flatness values of the 10 longitudinal sections as the measured flatness value. And the above test results are shown in tables 1 and 2.
TABLE 1
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Surface roughness (mm) | 0.25 | 0.29 | 0.28 | 0.30 | 0.27 |
| Flatness (mm/m) | 0.96 | 1.02 | 1.05 | 1.20 | 1.04 |
TABLE 2
| Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | |
| Surface roughness (mm) | 0.39 | 0.38 | 0.36 | 0.37 | 0.39 |
| Flatness (mm/m) | 1.52 | 1.55 | 1.49 | 1.56 | 1.53 |
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 (2)
1. A diamond grinding tool bit is characterized in that the horizontal projection of the grinding tool bit is in an arc surface shape formed by an outer arc edge, an inner arc edge and two side edges connecting the outer arc edge and the inner arc edge which are concentric, and the two side edges are parallel to each other; the method is characterized in that: the central angle of the outer circular arc edge and the inner circular arc edge is not more than 20 degrees, the grinding tool bit is formed by cold press molding of mixed powder consisting of metal bond containing tungsten carbide, diamond particles, graphite particles and metal halide additives to obtain a bit blank, and the bit blank is hot pressed and sintered to be molded, wherein the hot pressed and sintered temperature is 780-850 ℃, and the pressure is 200-300 kg/cm-2And the hot-pressing sintering is carried out in an oxygen-deficient atmosphere; wherein the content of the graphite particles is 0.25-1.0% of the weight of the metal bonding agent, and the content of the metal halide additive is 0.10-0.50% of the weight of the metal bonding agent; the oxygen-deficient atmosphere refers to an atmosphere containing 1-20 v% of air and the balance of nitrogen; the content of the diamond particles is 1.4-2.1% of the weight of the metal bond, and the particle size of the diamond particles is 0.125-0.425 mm; the particle size of the graphite particles is 5.0-200 mu m; the metal halide additive is selected from CoCl2、LaF3、CeF3NaF or CaF2At least one of; the metal bond contains: 30-45 wt% of Fe, 20-32 wt% of Cu, 5-15 wt% of Ni, 13-23 wt% of WC, 2-10 wt% of Sn, and not more than 15 wt% of Co, Al, Mn, Ag, Zn, Cr, Ti and Mo in total, wherein the addition amount of each element is not more than 3 wt%.
2. A method for preparing a diamond grinding tool bit is characterized in that the horizontal projection of the grinding tool bit is in an arc surface shape formed by an outer arc edge, an inner arc edge and two side edges which connect the outer arc edge and the inner arc edge which are concentric, and the two side edges are parallel to each other; the method is characterized in that: the central angle of the outer circular arc edge and the inner circular arc edge is less than or equal to 20 degrees; the method comprises the following steps:
(1) preparing a metal bonding agent containing tungsten carbide, diamond particles, graphite particles and a metal halide additive, and uniformly mixing to obtain mixed powder; the content of the graphite particles is 0.25-1.0% of the weight of the metal bonding agent, and the content of the metal halide additive is 0.10-0.50% of the weight of the metal bonding agent; the content of the diamond particles is 1.4-2.1% of the weight of the metal bond, and the particle size of the diamond particles is 0.125-0.425 mm; the particle size of the graphite particles is 5.0-200 mu m; the metal halide additive is selected from CoCl2、LaF3、CeF3NaF or CaF2At least one of; the metal bond contains: 30-45 wt% of Fe, 20-32 wt% of Cu, 5-15 wt% of Ni, 13-23 wt% of WC, 2-10 wt% of Sn, and not more than 15 wt% of Co, Al, Mn, Ag, Zn, Cr, Ti and Mo in total, wherein the addition amount of each element is not more than 3 wt%;
(2) carrying out cold press molding on the mixed powder in a die to obtain a cutter head blank;
(3) carrying out hot-pressing sintering molding on the tool bit blank, wherein the hot-pressing sintering temperature is 780-850 ℃, and the pressure is 200-300kg/cm2And the hot-pressing sintering is carried out in an oxygen-deficient atmosphere; the oxygen-deficient atmosphere refers to an atmosphere containing 1 to 20% by volume of air and the balance of nitrogen.
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| CN101201474A (en) * | 2006-12-11 | 2008-06-18 | 爱普生拓优科梦株式会社 | Dust-proof glass, and electro-optic device and projection type image display device using the same |
| CN107116490A (en) * | 2017-05-05 | 2017-09-01 | 江苏锋泰工具有限公司 | The SHS preparation methods of multi-block type diamond segment |
| CN108788162A (en) * | 2017-05-05 | 2018-11-13 | 江苏锋泰工具有限公司 | The preparation method of armored concrete saw blade tip |
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