CN112809005A - Circular saw using composite diamond saw head and preparation method of diamond saw head - Google Patents
Circular saw using composite diamond saw head and preparation method of diamond saw head Download PDFInfo
- Publication number
- CN112809005A CN112809005A CN202011621031.0A CN202011621031A CN112809005A CN 112809005 A CN112809005 A CN 112809005A CN 202011621031 A CN202011621031 A CN 202011621031A CN 112809005 A CN112809005 A CN 112809005A
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- Prior art keywords
- diamond
- blade
- saw head
- diamond saw
- powder
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Images
Classifications
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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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
-
- B22F1/0003—
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/103—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent
-
- 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
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
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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
- 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
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
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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
- 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
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
- B28D1/12—Saw-blades or saw-discs specially adapted for working stone
- B28D1/121—Circular saw blades
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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
- 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
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F2003/145—Both compacting and sintering simultaneously by warm compacting, below debindering temperature
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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
- 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
- B22F2003/241—Chemical after-treatment on the surface
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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
- 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
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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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Abstract
The invention discloses a circular saw using a composite diamond saw head and a preparation method of the diamond saw head. The diamond saw blade is characterized by comprising a plurality of circular saw blades, wherein a plurality of diamond saw heads are welded at intervals at saw tooth positions on the edge of the saw blades in the cutting edge direction; the diamond saw head protrudes outwards from the edge of the cutting edge direction of the saw blade; the diamond saw head comprises four first blade blanks, one second blade blank, a plurality of first diamond particles and a plurality of second diamond particles; the first diamond particles are embedded in the blind holes, and the tops of the first diamond particles positioned on the left outer side and the right outer side of the diamond saw head are exposed out of the outer sides; the first blade blank comprising a plurality of blind holes is integrally formed; the diamond saw head is fused into a gapless integral body through pressure sintering. The invention also provides a preparation method of the composite diamond saw head, and the prepared diamond saw head has the advantages of good cutting efficiency, long service life and low energy consumption.
Description
Technical Field
The invention relates to the technical field of diamond tools, in particular to a circular saw using a composite diamond saw head and a preparation method of the diamond saw head.
Background
The diamond circular saw of prior art, adopt diamond and the shaping of metal powder mixed cloth to the saw head matrix, diamond particle produces segregation or gathering easily in the forming process of saw head matrix, cause the interval part between the diamond particle too big and some partial diamond particle reunion make the interval undersize, the part of interval undersize leads to the control power of diamond particle unstable, diamond particle drops easily and wastes in the use, and diamond saw cutting force is little, easy stone material polishing and wearing and tearing, cause the detritus to block up and obstruct getting rid of the detritus simultaneously, cause the saw cutting efficiency to descend. And the part with large spacing between diamond particles has overlarge working load born by single diamond, is easy to crack and fall off due to large impact force, and further influences the cutting speed and the service life. Some improvements adopt a granulating or dispensing process, and although the distribution of diamond particles is improved, the problem of insufficient holding force of diamond particles cannot be fundamentally solved, so that the energy consumption is high and the cutting efficiency is low.
And the forming and sintering process of dispensing cloth arrangement is complicated, the production equipment efficiency is low, the automation degree is low, and the mass production is difficult to meet the market demand of the increasingly expanded stone cutting processing.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a technical scheme of a circular saw using a composite-formed diamond saw head.
The invention also aims to provide a preparation method of the composite diamond saw head with simple process and high production efficiency so as to meet the market demand.
In order to achieve the purpose, the invention adopts the following technical scheme:
a circular saw using composite diamond saw heads comprises a plurality of circular saw blades, wherein a plurality of diamond saw heads are welded at intervals on saw teeth in the cutting edge direction of the saw blades; the diamond saw head protrudes outwards from the edge of the cutting edge direction of the saw blade;
the diamond saw head comprises four first blade blanks, one second blade blank, a plurality of first diamond particles and a plurality of second diamond particles, the first blade blanks are averagely divided into two groups, every two first blade blanks in the same group are abutted against each other, the two groups of first blade blanks are abutted against two side faces, perpendicular to the cutting direction, of the second blade blanks respectively, and the second blade blanks are filled with the plurality of second diamond particles;
more than one hundred and fifty blind holes are formed in the left side surface of the first blade blank body on the left side; the right side surface of the first blade blank body positioned on the right side is also provided with more than one hundred and fifty blind holes; the blind holes are orderly arranged on the left side surface or the right side surface of the first blade blank body at intervals from top to bottom;
the first diamond particles are embedded in the blind holes, and the tops of the first diamond particles positioned on the left outer side and the right outer side of the diamond saw head are exposed out of the outer sides;
the first blade blank including a plurality of blind holes is integrally formed; the diamond saw head is fused into a gapless whole body through pressing and sintering.
Preferably, the blind holes are uniformly arranged at intervals, and the aperture of each blind hole is 1.1-1.2 times of the particle size of the first diamond particle;
the first diamond particles have a particle size of 0.425 to 0.500mm, and the first blade blank includes a total volume of the first diamond particles of 16 to 20% of a volume of the first blade blank;
the particle size of the second diamond particles is 0.30-0.35mm, and the total volume of the second diamond particles which are randomly distributed and included in the second blade blank accounts for 12-15% of the volume of the second blade blank;
the distance between two adjacent blind holes is 1.5-2.5 times of the aperture of each blind hole;
the distance between the left outer side surface and the right outer side surface of the diamond saw head is 6.8-7.2 mm;
the outer side surface of the diamond saw head, which is far away from the center, is also provided with a plurality of chip removal holes.
Preferably, the surface of the first diamond particle is covered with a carbonized alloy film, and the carbonized alloy film also covers the gap between the first diamond particle and the blind hole;
the raw materials of the carbonized alloy film comprise metal molybdenum micro powder and metal tungsten micro powder, and the mass ratio of the metal molybdenum micro powder to the metal tungsten micro powder is 1: 1.
Preferably, the first blade blank body and the second blade blank body are both formed by injection molding of alloy powder and an injection molding adhesive, and the mass percentages of the alloy powder and the injection molding adhesive are 85-95% and 5-15%, respectively;
the alloy powder comprises the following components in percentage by mass: 12-18% of metal cobalt powder, 25-35% of metal copper powder, 6-12% of metal nickel powder, 2-5% of metal tin powder and 39-45% of metal iron powder; the granularity of the alloy powder is 10-20 mu mm;
the injection molding adhesive comprises the following raw materials in percentage by mass: 30-45% of paraffin, 10-20% of microcrystalline paraffin, 10-15% of vinyl acetate vinyl, 5-10% of atactic polypropylene, 15-20% of high-density polyethylene, 1-2% of dioctyl phthalate, 1-2% of stearic acid and 0.5-1% of oleic acid.
The invention further provides a preparation method of the composite diamond saw head, which is used for preparing the circular saw using the composite diamond saw head and comprises a diamond particle granulation step, a first blade blank injection molding step, a first blade laminating body temperature and pressure forming step, a diamond saw head injection molding step and a diamond saw head pressure sintering step;
the injection molding step of the first blade blank comprises the following steps:
s1) respectively weighing alloy powder and an injection molding adhesive according to the mass percentage, uniformly mixing, putting into a kneader, kneading for 2 hours at 160-170 ℃, cooling and crushing to prepare an alloy injection molding feed;
s2) feeding the alloy into an injection molding feeder, and performing injection molding at 170-180 ℃ by using a first mold to obtain a first blade blank with a plurality of orderly arranged blind holes on the same side.
Specifically, in the step S1), the mass percentages of the alloy powder and the injection molding adhesive are 85-95% and 5-15%, respectively;
the alloy powder comprises the following components in percentage by mass: 12-18% of metal cobalt powder, 25-35% of metal copper powder, 6-12% of metal nickel powder, 2-5% of metal tin powder and 39-45% of metal iron powder; the granularity of the alloy powder is 10-20 mu mm;
the injection molding adhesive comprises the following raw materials in percentage by mass: 30-45% of paraffin, 10-20% of microcrystalline paraffin, 10-15% of vinyl acetate vinyl, 5-10% of atactic polypropylene, 15-20% of high-density polyethylene, 1-2% of dioctyl phthalate, 1-2% of stearic acid and 0.5-1% of oleic acid;
in step S2), the total volume of all the blind holes accounts for 18-20% of the volume of the first insert blank.
Specifically, the diamond particle granulation step comprises:
p1) weighing the metal molybdenum micro powder, the metal tungsten micro powder and the rosin powder respectively according to the weight ratio of 2:2:5 to prepare mixed metal micro powder;
p2) adding the mixed metal powder into absolute ethyl alcohol, stirring under the condition of constant-temperature water bath at 50 ℃ until rosin powder is completely dissolved, and preparing a granulating liquid containing suspended metal micro powder;
p3) screening first diamond particles by a 35-40 mesh filter screen, putting the screened first diamond particles into a roller type granulator, starting the granulator to rotate, spraying the granulating liquid on the surfaces of the first diamond particles, starting an exhaust device of the granulator until the absolute ethyl alcohol is completely volatilized, putting zirconia ceramic balls into the granulator, and rotationally stirring the mixture for 30 minutes to obtain granules of the first diamond particles;
a first blade pressing body temperature and pressure forming step:
q1) putting the granules into each blind hole of the first blade blank, and heating for 2 minutes by using hot air at the temperature of 70-80 ℃ to prepare a pre-cured first blade mixture;
q2) taking four first blade mixtures, stacking the four first blade mixtures in pairs in a group in the direction that the blind holes face upwards to form two groups, and putting the first blade mixtures in the first group or the second group into a warm-pressing die in the direction that the blind holes face upwards;
q3) putting the diamond saw head injection molding body into a warm-pressing mould, putting a pressing plate of the warm-pressing mould above the diamond saw head injection molding body, heating and pressing, and keeping constant temperature and constant pressure for 3-5 minutes to respectively prepare two first blade pressing bodies.
Specifically, in the step P2), the mixing mass ratio of the mixed metal powder to the absolute ethyl alcohol is 1: 1;
in the step P3), the mass ratio of the first diamond particles to the zirconia ceramic balls is 1:2, and the diameters of the zirconia ceramic balls are 2 mm;
in the step Q3), the temperature for heating and pressing is 100-150 ℃, and the pressure is 20-30T.
Specifically, the injection molding step of the diamond saw head comprises the following steps:
r1) adding second diamond particles accounting for 12-15% of the volume of the alloy injection molding feed into the alloy injection molding feed, and uniformly mixing and stirring to prepare a second blade mixture;
r2) placing a first blade pressing body in a second injection mould according to the direction that a blind hole faces downwards, and adding a second blade mixed material which is 1.5 times of the volume of the first blade mixed body above the first blade pressing body; placing a second first blade pressing body above the second blade mixture in a direction that the blind hole faces downwards;
r3) is molded by injection at 170-180 ℃ to prepare a diamond saw head injection molding body with a plurality of chip removal holes on the top surface;
the diamond saw head pressure sintering step comprises the following steps:
t1) putting the diamond saw head injection molding body into a trichloroethylene solution at a constant temperature, soaking for 24 hours for solvent degreasing, taking out and drying to obtain a diamond saw head degreased body;
t2) putting the diamond saw head degreased body into a vacuum sintering furnace, heating to above 800 ℃ and vacuumizing, then adding inert gas for pressurization, sintering for 0.5 hour under constant temperature and constant pressure, naturally cooling to room temperature, and thus obtaining the diamond saw head 2.
Specifically, in the step T1), the constant temperature is 50-60 ℃;
in the step T2), the inert gas is argon, the sintering constant temperature is 920 ℃, and the constant pressure is 10 MPa.
The invention has the beneficial effects that: according to the circular saw using the composite diamond saw head, the plurality of first diamond particles and the first blade blank are injected and pressed into a whole, so that the first diamond particles have better holding force and are not easy to fall off; the diamond saw head is formed by pressing, sintering and fusing into a gapless whole, and a carbonized alloy film is wrapped between the first diamond particles and the blind holes, so that the diamond saw head has good heat resistance and tensile strength, the cutting endurance strength of the saw head can be improved, and the cutting speed of the circular saw using the composite diamond saw head can be further improved.
As shown in the figure, the diamond saw head comprises four first blade blanks and four first blades consisting of a plurality of first diamond particles and a second blade blank and a plurality of second diamond particles, which are arranged on two sides, so that the diamond saw head has good cutting force and good cost advantage.
Furthermore, the invention also provides a preparation method of the circular saw using the composite diamond saw head, the preparation process is simple and simple in facility, mass production is easy to realize, and the prepared circular saw using the composite diamond saw head has the advantages that diamond particles are not easy to fall off, the chip removal speed is high, and the service life is long.
Drawings
Fig. 1 is a photograph of a circular saw using a composite type diamond saw head according to an embodiment of the present invention;
FIG. 2 is a schematic view of the saw blade of the circular saw of FIG. 1;
FIG. 3 is a schematic cross-sectional structural view of the composite diamond saw head of FIG. 2;
fig. 4 is a schematic structural view of the first blade blank of fig. 2 with diamond particles mounted thereon;
FIG. 5 is a schematic cross-sectional view of a first blade prior to compression molding by a compression body;
FIG. 6 is a schematic structural view of a cross section of a first blade press body in a heated press mold after warm press forming;
wherein: a saw blade 1; a diamond saw head 2; a first blade blank 21; first diamond particles 22; a second insert blank 23 and a blind bore 211.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The technical scheme of the invention is further explained by combining the attached figures 1-6 and the specific implementation mode.
A circular saw using composite diamond saw heads comprises a plurality of circular saw blades 1, wherein a plurality of diamond saw heads 2 are welded at intervals on saw teeth in the cutting edge direction of the saw blades 1; the diamond saw head 2 protrudes outwards from the edge of the cutting edge direction of the saw blade 1;
the diamond saw head 2 comprises four first blade blanks 21, one second blade blank 23, a plurality of first diamond particles 22 and a plurality of second diamond particles 24, the first blade blanks 2 are averagely divided into two groups, every two first blade blanks 2 in the same group are abutted against each other, the two groups of first blade blanks 2 are respectively abutted against two side faces, perpendicular to the cutting direction, of the second blade blanks 23, and the second blade blanks 23 are filled with the plurality of second diamond particles 24;
the left side surface of the first blade blank body 21 on the left side is provided with more than one hundred and fifty blind holes 211; the right side surface of the first blade blank body 21 on the right side is also provided with more than one hundred and fifty blind holes 211; the blind holes 211 are arranged on the left side surface or the right side surface of the first blade blank body 21 at intervals from top to bottom in an orderly manner;
the first diamond particles 22 are embedded in the blind holes 211, and the tops of the first diamond particles 22 positioned on the left outer side and the right outer side of the diamond saw head 2 are exposed out of the outer sides;
the first blade blank 21 including the plurality of blind holes 211 is integrally formed; the diamond saw head 2 is fused into a gapless whole body through pressing and sintering.
According to the circular saw using the composite type diamond saw head, the plurality of first diamond particles 22 and the first blade blank body 21 are injected and pressed into a whole, so that the first diamond particles 22 have better holding force and are not easy to fall off; the diamond saw head 2 is formed into a gapless whole by pressing, sintering and fusing, and a carbonized alloy film is wrapped between the first diamond particles 22 and the blind holes 211, so that the diamond saw head has good heat resistance and tensile strength, the cutting endurance strength of the saw head 2 can be improved, and the cutting speed of the circular saw using the composite diamond saw head can be further improved.
As shown in fig. 1 to 6, the diamond saw head 2 includes four first blades composed of four first blade blanks 21 and a plurality of first diamond particles 22 on two sides, and a second blade composed of one second blade blank 23 and a plurality of second diamond particles 24, which has good cutting force and good cost advantage.
The blind hole 211 and the first blade blank 21 are integrally formed, so that the supporting force of the diamond particles 22 can be improved, the first diamond particles 22 embedded in the blind hole 211 have better stability and holding force, the first diamond particles 22 are not easy to fall off in the using process, and the circular saw using the composite diamond saw head has a good service life.
As shown in fig. 4 and 5, the blind holes 211 are sequentially arranged on the left side surface or the right side surface of the first blade blank 21 from top to bottom at intervals; the tops of the first diamond particles 22 positioned on the left outer side and the right outer side of the diamond saw head 2 are exposed out of the outer sides; make the blade direction of the circular saw of use compound diamond saw head arrange and have four rows of first diamond granule 22 and have stronger cutter power, can stand out behind the both sides face edging and have more than one hundred fifty orderly first diamond granule 22 of arrangement, have good chip removal speed, can effectively improve the radiating efficiency and the life of the circular saw of use compound diamond saw head.
Preferably, the blind holes 211 are uniformly arranged at intervals, and the aperture of the blind holes 211 is 1.1 to 1.2 times the particle size of the first diamond particles 22;
the first diamond particles 22 have a particle size of 0.425 to 0.500mm, and the first blade blank 21 includes the first diamond particles 22 in a total volume of 16 to 20% of the volume of the first blade blank 21;
the particle size of the second diamond particles 24 is 0.30-0.35mm, and the total volume of the second diamond particles 24 in the second blade blank 23 in the disordered arrangement is 12-15% of the volume of the second blade blank 23;
the distance between two adjacent blind holes 211 is 1.5-2.5 times of the aperture of each blind hole 211;
the distance between the left outer side surface and the right outer side surface of the diamond saw head 2 is 6.8-7.2 mm;
the outer side surface of the diamond saw head 2, which is far away from the center, is also provided with a plurality of chip removal holes.
The blind holes 211 arranged at regular hexagonal intervals have better utilization rate of ordered arrangement space, so that the stress of each first diamond particle 22 is more uniform;
the first diamond particles 22 with the particle size of 0.425-0.500mm screened by a 35-40-mesh filter screen are relatively uniform in particle size, uniform in particles and 1.5-2 times of the particle size in distance, and not only can have good cutting distance, but also have good chip removal speed, the chip removal speed can be increased rapidly, the surface temperature of the first diamond particles 22 can be prevented from being continuously increased due to blocking of chips, and then burning due to overhigh temperature can be avoided, the cutting force, the cutting efficiency, the heat resistance and the service life of the composite diamond saw head can be improved, and the power consumption and the energy consumption can be effectively reduced.
The thickness of the diamond saw head 2 is set to be 6.8-7.2mm, the width of a cutting gap is proper, and the excessive loss of stone cutting can be avoided while the cutting efficiency is met.
The lateral surface of keeping away from the center of diamond saw head 2 still is equipped with the lateral surface of keeping away from the center of a plurality of chip removal holes and still is equipped with a plurality of chip removal holes, can improve diamond saw head 2's chip removal speed, and then avoids diamond saw head 2 is overheated, makes the circular saw of compound diamond saw head of use better life has.
Preferably, the surface of the first diamond particle 22 is covered with a film of carbonized alloy, and the film of carbonized alloy also covers the gap between the first diamond particle 22 and the blind hole 2111;
the raw materials of the carbonized alloy film comprise metal molybdenum micro powder and metal tungsten micro powder, and the mass ratio of the metal molybdenum micro powder to the metal tungsten micro powder is 1: 1.
The carbonized alloy film covered on the surface of the first diamond particles 22 is connected with the blind holes 211 into a whole, so that the tensile strength of the first diamond particles 22 fixed in the blind holes 211 can be improved, the holding force of the first diamond particles 22 in the composite diamond saw head is further improved, the falling of the first diamond particles 22 in the using process is reduced, the cutting force, the cutting efficiency, the heat resistance and the stability of the service life of the composite diamond saw head are further improved, and the power consumption can be effectively reduced.
The tungsten contained in the diamond saw blade can improve the heat conduction and heat resistance of the carbonized alloy film, so that the diamond saw blade 2 has longer service life.
Preferably, the first blade blank body 21 and the second blade blank body 23 are both formed by injection molding of alloy powder and an injection molding adhesive, and the mass percentages of the alloy powder and the injection molding adhesive are 85-95% and 5-15%, respectively;
the alloy powder comprises the following components in percentage by mass: 12-18% of metal cobalt powder, 25-35% of metal copper powder, 6-12% of metal nickel powder, 2-5% of metal tin powder and 39-45% of metal iron powder; the granularity of the alloy powder is 10-20 mu mm;
the injection molding adhesive comprises the following raw materials in percentage by mass: 30-45% of paraffin, 10-20% of microcrystalline paraffin, 10-15% of vinyl acetate vinyl, 5-10% of atactic polypropylene, 15-20% of high-density polyethylene, 1-2% of dioctyl phthalate, 1-2% of stearic acid and 0.5-1% of oleic acid.
The alloy powder contained not only can improve the strength and the heat conductivity of the first blade blank body 21 and the second blade blank body 23, but also can improve the strength of the diamond saw head 2 welded to the saw blade 1.
The invention further provides a preparation method of the composite diamond saw head, which is used for preparing the circular saw using the composite diamond saw head and comprises a diamond particle granulation step, a first blade blank injection molding step, a first blade laminating body temperature and pressure forming step, a diamond saw head injection molding step and a diamond saw head pressure sintering step;
the injection molding step of the first blade blank comprises the following steps:
s1) respectively weighing alloy powder and an injection molding adhesive according to the mass percentage, uniformly mixing, putting into a kneader, kneading for 2 hours at 160-170 ℃, cooling and crushing to prepare an alloy injection molding feed;
s2), feeding the alloy into an injection molding feeder, and performing injection molding at 170-180 ℃ by using a first mold to obtain a first blade blank 21 with a plurality of orderly-arranged blind holes 211 on the same side.
The first blade blank 21 formed by injection molding not only contains alloy materials, but also is provided with a plurality of orderly arranged blind holes 211, and the blind holes 211 and the first blade blank 21 are integrally formed, so that the supporting force of the first diamond particles 22 can be improved, and the first diamond particles 22 embedded in the blind holes 211 have better stability and holding force.
Specifically, in the step S1), the mass percentages of the alloy powder and the injection molding adhesive are 85-95% and 5-15%, respectively;
the alloy powder comprises the following components in percentage by mass: 12-18% of metal cobalt powder, 25-35% of metal copper powder, 6-12% of metal nickel powder, 2-5% of metal tin powder and 39-45% of metal iron powder; the granularity of the alloy powder is 10-20 mu mm;
the injection molding adhesive comprises the following raw materials in percentage by mass: 30-45% of paraffin, 10-20% of microcrystalline paraffin, 10-15% of vinyl acetate vinyl, 5-10% of atactic polypropylene, 15-20% of high-density polyethylene, 1-2% of dioctyl phthalate, 1-2% of stearic acid and 0.5-1% of oleic acid;
in step S2), the total volume of all the blind holes 211 accounts for 18-20% of the volume of the first insert blank 21.
After the injection molding adhesive is added into the alloy powder with the granularity of 10-20 mu mm, the first blade blank 21 has good metal hardness and heat conducting performance through kneading and injection molding, so that the first blade blank 21 not only can provide better supporting force for the first diamond particles 22 embedded in the first blade blank 21, but also has the heat dissipation effect of rapid heat conduction, and the service life of the prepared composite diamond saw head can be prolonged.
The total volume of the blind holes 211 accounts for 18-20% of the volume concentration of the first blade blank 21, and after pressing and sintering, the first diamond particles 22 embedded in the blind holes 211 can be ensured to account for 13-16% of the total volume of the diamond saw head 2, so that the cutting force and the service life of the manufactured composite diamond saw head are ensured.
Specifically, the diamond particle granulation step comprises:
p1) weighing the metal molybdenum micro powder, the metal tungsten micro powder and the rosin powder respectively according to the weight ratio of 2:2:5 to prepare mixed metal micro powder;
p2) adding the mixed metal powder into absolute ethyl alcohol, stirring under the condition of constant-temperature water bath at 50 ℃ until rosin powder is completely dissolved, and preparing a granulating liquid containing suspended metal micro powder;
p3) screening the first diamond particles 22 by a 35-40 mesh filter screen, putting the screened first diamond particles 22 into a drum type granulator, starting the granulator to rotate, spraying the granulating liquid on the surface of the first diamond particles 22, starting an exhaust device of the granulator until the absolute ethyl alcohol is completely volatilized, putting zirconia ceramic balls into the granulator, and rotationally stirring the mixture for 30 minutes to obtain a granulating body of the first diamond particles 22;
a first blade pressing body temperature and pressure forming step:
q1) putting the granules into each blind hole 211 of the first blade blank 21, and heating for 2 minutes by using hot air at 70-80 ℃ to prepare a pre-cured first blade mixture;
q2) taking four first blade mixtures, stacking the four first blade mixtures in pairs in a group in the direction that the blind holes face upwards to form two groups, and putting the first blade mixtures in the first group or the second group into a warm-pressing die in the direction that the blind holes face upwards;
q3) putting the diamond saw head injection molding body into a warm-pressing mould, putting a pressing plate of the warm-pressing mould above the diamond saw head injection molding body, heating and pressing, and keeping constant temperature and constant pressure for 3-5 minutes to respectively prepare two first blade pressing bodies.
Dissolving rosin powder in absolute ethyl alcohol to form a low-temperature adhesive, rotating and rolling in a granulator, adding zirconia ceramic balls, stirring to prevent the first diamond particles 22 from being bonded together, and rotating and stirring for 30 minutes to form spherical first diamond particles 22 with uniform size and completely wrapped with granulating liquid.
The low-temperature binder can be rosin or saturated urushiol, and the rosin powder is easy to purchase and has better cost. The volatile organic solvent can be absolute ethyl alcohol, diethyl ether or acetone.
Under the conditions of high temperature, high pressure and no oxygen, the molybdenum micro powder in contact with the surface of the first diamond particles 22 forms molybdenum carbide through sintering, so that the granulating liquid wrapped on the first diamond particles 22 becomes a carbonized alloy film, the holding force of the first diamond particles 22 in the composite diamond saw head is improved, and the composite diamond saw head has better cutting efficiency and longer service life.
Specifically, in the step P2), the mixing mass ratio of the mixed metal powder to the absolute ethyl alcohol is 1: 1;
in the step P3), the mass ratio of the first diamond particles to the zirconia ceramic balls is 1:2, and the diameters of the zirconia ceramic balls are 2 mm;
in the step Q3), the temperature for heating and pressing is 100-150 ℃, and the pressure is 20-30T.
The mass ratio of the first diamond particles 22 to the zirconia ceramic balls is 1:2, the diameter of the zirconia ceramic balls is 2mm, the separation effect of the first diamond particles 22 during stirring can be better, the surfaces of the first diamond particles 22 are more completely covered by the granulating liquid, the tensile strength of the first diamond particles 22 fixed in the blind holes 211 is improved, the holding force of the first diamond particles 22 in the composite diamond saw head is further improved, and the composite diamond saw head has better cutting efficiency and service life.
By the preheating solidification of the step Q1), it is possible to prevent the first diamond particles 22 from falling out of the blind holes 211 while moving the loading mold, thereby improving the stability of the fitting of the first diamond particles 22 in the blind holes 211.
Heating the blank in a warm-pressing mold to 100-150 ℃, melting the first blade blank 21 into a flowing plastic object again, completely filling the gap between the blind hole 211 and the first diamond particle 22 when the head undergoes waxy deformation under the pressure of 20-30 tons, completely removing the air in the gap, and mutually bonding the first diamond particle 22 and the first blade blank 21 into a compact body, as shown in fig. 4 and 5.
Specifically, the injection molding step of the diamond saw head comprises the following steps:
r1) adding second diamond particles accounting for 12-15% of the volume of the alloy injection molding feed into the alloy injection molding feed, and uniformly mixing and stirring to prepare a second blade mixture;
r2) placing a first blade pressing body in a second injection mould according to the direction that a blind hole faces downwards, and adding a second blade mixed material which is 1.5 times of the volume of the first blade mixed body above the first blade pressing body; placing a second first blade pressing body above the second blade mixture in a direction that the blind hole faces downwards;
r3) is molded by injection at 170-180 ℃ to prepare a diamond saw head injection molding body with a plurality of chip removal holes on the top surface;
the diamond saw head pressure sintering step comprises the following steps:
t1) putting the diamond saw head injection molding body into a trichloroethylene solution at a constant temperature, soaking for 24 hours for solvent degreasing, taking out and drying to obtain a diamond saw head degreased body;
t2) putting the diamond saw head degreased body into a vacuum sintering furnace, heating to above 800 ℃ and vacuumizing, then adding inert gas for pressurization, sintering for 0.5 hour under constant temperature and constant pressure, naturally cooling to room temperature, and thus obtaining the diamond saw head 2.
By soaking in the trichloroethylene solution of step T1) for 24 hours, incompletely reacted organic substances contained in the first diamond particles 22 and the first blade blank 21 may be sufficiently precipitated and dissolved in the trichloroethylene solution, thereby improving the heat resistance and the service life of the first diamond particles 22 and the first blade blank 21.
Through the step T2), after high-temperature and high-pressure sintering, the internal stress generated in the pressing process of the diamond saw head 2 can be released through natural cooling, so that the risks of deformation, fragmentation and poor falling of the first diamond particles 22 in use are reduced, and the service performance and the service life stability of the prepared composite diamond saw head are improved.
Specifically, in the step T1), the constant temperature is 50-60 ℃;
in the step T2), the inert gas is argon, the sintering constant temperature is 920 ℃, and the constant pressure is 10 MPa.
The trichloroethylene solution with the constant temperature of 50-60 ℃ has better dissolving effect on organic matters.
Sintering at 920 ℃ in an argon atmosphere can avoid the first diamond particles 22 and the alloy powder from being oxidized, and the alloy powder coated on the surface of the first diamond particles 22 and the surface of the first blade blank 21 are fully fused and bonded into a whole.
Under the conditions of 10MPa high temperature and high pressure at 920 ℃ and no oxygen, the metal molybdenum micro powder in the granulating liquid and the carbon molecules on the surfaces of the first diamond particles 22 are subjected to chemical reaction to form molybdenum carbide, so that the granulating liquid coated on the first diamond particles 22 forms a carbonized alloy film, the holding force of the first diamond particles 22 in the composite diamond saw head is further improved, and the composite diamond saw head has better cutting efficiency and longer service life.
The preparation method of the composite diamond saw head has simple process, is suitable for an automatic and large-batch production mode, and can meet the requirement of the existing market on a high-efficiency cutting diamond tool for stone processing.
Examples
1. A circular saw using composite diamond saw heads comprises a plurality of circular saw blades 1, wherein a plurality of diamond saw heads 2 are welded at intervals on saw teeth in the cutting edge direction of the saw blades 1; the diamond saw head 2 protrudes outwards from the edge of the cutting edge direction of the saw blade 1;
the diamond saw head 2 comprises four first blade blanks 21, one second blade blank 23, a plurality of first diamond particles 22 and a plurality of second diamond particles 24, the first blade blanks 2 are divided into two groups, every two first blade blanks 2 in the same group are abutted against each other, the two groups of first blade blanks 2 are abutted against two side faces, perpendicular to the cutting direction, of the second blade blanks 23 respectively, and the second blade blanks 23 are filled with the plurality of second diamond particles 24;
the left side surface of the first blade blank body 21 on the left side is provided with more than one hundred and fifty blind holes 211; the right side surface of the first blade blank body 21 on the right side is also provided with more than one hundred and fifty blind holes 211; the blind holes 211 are arranged on the left side surface or the right side surface of the first blade blank body 21 at intervals from top to bottom in an orderly manner;
the first diamond particles 22 are embedded in the blind holes 211, and the tops of the first diamond particles 22 positioned on the left outer side and the right outer side of the diamond saw head 2 are exposed out of the outer sides;
the first blade blank 21 including the plurality of blind holes 211 is integrally formed; the diamond saw head 2 is fused into a gapless whole body through pressing and sintering.
The blind holes 211 are uniformly arranged at intervals, and the aperture of each blind hole 211 is 1.1-1.2 times the particle size of the first diamond particles 22;
the first diamond particles 22 have a particle size of 0.425 to 0.500mm, and the first blade blank 21 includes the first diamond particles 22 in a total volume of 16 to 20% of the volume of the first blade blank 21;
the particle size of the second diamond particles 24 is 0.30-0.35mm, and the total volume of the second diamond particles 24 in the second blade blank 23 in the disordered arrangement is 12-15% of the volume of the second blade blank 23;
the distance between two adjacent blind holes 211 is 1.5-2.5 times of the aperture of each blind hole 211;
the distance between the left outer side surface and the right outer side surface of the diamond saw head 2 is 6.8-7.2 mm;
the outer side surface of the diamond saw head 2, which is far away from the center, is also provided with a plurality of chip removal holes.
The surface of the first diamond particle 22 is covered with a carbonized alloy film, and the carbonized alloy film also covers the gap between the first diamond particle 22 and the blind hole 2111;
the raw materials of the carbonized alloy film comprise metal molybdenum micro powder and metal tungsten micro powder, and the mass ratio of the metal molybdenum micro powder to the metal tungsten micro powder is 1: 1.
The first blade blank body 21 and the second blade blank body 23 are both formed by injection molding of alloy powder and an injection molding adhesive, and the mass percentages of the alloy powder and the injection molding adhesive are respectively 92% and 8%;
the alloy powder comprises the following components in percentage by mass: 15% of metal cobalt powder, 30% of metal copper powder, 9% of metal nickel powder, 3% of metal tin powder and 43% of metal iron powder; the granularity of the alloy powder is 10-20 mu mm;
the injection molding adhesive comprises the following raw materials in percentage by mass: paraffin wax 40%, microcrystalline paraffin wax 15%, vinyl acetate 15%, atactic polypropylene 8%, high-density polyethylene 17%, dioctyl phthalate 2%, stearic acid 2% and oleic acid 1%.
2. A preparation method of a composite diamond saw head is used for preparing the circular saw using the composite diamond saw head, and comprises a diamond particle granulation step, a first blade blank injection molding step, a first blade laminating body temperature and pressure molding step, a diamond saw head injection molding step and a diamond saw head pressure sintering step;
the injection molding step of the first blade blank comprises the following steps:
s1) respectively weighing alloy powder and an injection molding adhesive according to the mass percentage, uniformly mixing, putting into a kneader, kneading for 2 hours at 160-170 ℃, cooling and crushing to prepare an alloy injection molding feed;
s2) feeding the alloy into an injection molding feeder, and performing injection molding at 170-180 ℃ by using a first mold to obtain a first blade blank with a plurality of orderly arranged blind holes on the same side.
In the step S1), the mass percentages of the alloy powder and the injection molding adhesive are respectively 92% and 8%;
the alloy powder comprises the following components in percentage by mass: 15% of metal cobalt powder, 30% of metal copper powder, 9% of metal nickel powder, 3% of metal tin powder and 43% of metal iron powder; the granularity of the alloy powder is 10-20 mu mm;
the injection molding adhesive comprises the following raw materials in percentage by mass: paraffin wax 40%, microcrystalline paraffin wax 15%, vinyl acetate 15%, atactic polypropylene 8%, high-density polyethylene 17%, dioctyl phthalate 2%, stearic acid 2% and oleic acid 1%.
Step S2), the total volume of all the blind holes 211 accounts for 18% of the volume of the first insert blank 21.
The diamond particle granulating step comprises:
p1) weighing the metal molybdenum micro powder, the metal tungsten micro powder and the rosin powder respectively according to the weight ratio of 2:2:5 to prepare mixed metal micro powder;
p2) adding the mixed metal powder into absolute ethyl alcohol, stirring under the condition of constant-temperature water bath at 50 ℃ until rosin powder is completely dissolved, and preparing a granulating liquid containing suspended metal micro powder;
p3) screening the first diamond particles 22 by a 35-40 mesh filter screen, putting the screened first diamond particles 22 into a drum type granulator, starting the granulator to rotate, spraying the granulating liquid on the surface of the first diamond particles 22, starting an exhaust device of the granulator until the absolute ethyl alcohol is completely volatilized, putting zirconia ceramic balls into the granulator, and rotationally stirring the mixture for 30 minutes to obtain a granulating body of the first diamond particles 22;
a first blade pressing body temperature and pressure forming step:
q1) putting the granules into each blind hole 211 of the first blade blank 21, and heating for 2 minutes by using hot air at 70-80 ℃ to prepare a pre-cured first blade mixture;
q2) taking four first blade mixtures, stacking the four first blade mixtures in pairs in a group in the direction that the blind holes face upwards to form two groups, and putting the first blade mixtures in the first group or the second group into a warm-pressing die in the direction that the blind holes face upwards;
q3) putting the diamond saw head injection molding body into a warm-pressing mould, putting a pressing plate of the warm-pressing mould above the diamond saw head injection molding body, heating and pressing, and keeping constant temperature and constant pressure for 3-5 minutes to respectively prepare two first blade pressing bodies.
In the step P2), the mixing mass ratio of the mixed metal powder to the absolute ethyl alcohol is 1: 1;
in the step P3), the mass ratio of the first diamond particles to the zirconia ceramic balls is 1:2, and the diameters of the zirconia ceramic balls are 2 mm;
in the step Q3), the temperature for heating and pressing is 130 ℃, and the pressure is 28T.
The injection molding step of the diamond saw head comprises the following steps:
r1) adding second diamond particles accounting for 12-15% of the volume of the alloy injection molding feed into the alloy injection molding feed, and uniformly mixing and stirring to prepare a second blade mixture;
r2) placing a first blade pressing body in a second injection mould according to the direction that a blind hole faces downwards, and adding a second blade mixed material which is 1.5 times of the volume of the first blade mixed body above the first blade pressing body; placing a second first blade pressing body above the second blade mixture in a direction that the blind hole faces downwards;
r3) is molded by injection at 170-180 ℃ to prepare a diamond saw head injection molding body with a plurality of chip removal holes on the top surface;
the diamond saw head pressure sintering step comprises the following steps:
t1) putting the diamond saw head injection molding body into a trichloroethylene solution at a constant temperature, soaking for 24 hours for solvent degreasing, taking out and drying to obtain a diamond saw head degreased body;
t2) putting the diamond saw head degreased body into a vacuum sintering furnace, heating to above 800 ℃ and vacuumizing, then adding inert gas for pressurization, sintering for 0.5 hour under constant temperature and constant pressure, naturally cooling to room temperature, and thus obtaining the diamond saw head 2.
In the step T1), the constant temperature is 55 ℃;
in the step T2), the inert gas is argon, the sintering constant temperature is 920 ℃, and the constant pressure is 10 MPa.
3. The disk saw using the composite diamond saw head and the disk saw of the prior art, in which a single saw head contains randomly arranged diamond particles with a volume concentration of 15%, are used for cutting granite island barren rocks with the same hardness of grade 3, the disk saw is matched and prepared by the same motor, the actual cutting speed, the output power and other data of the two disk saws are recorded, the relevant test items and conditions are as follows, and the test results of the examples and the comparative examples are shown in the following table 1.
TABLE-1 Experimental results of examples and comparative examples
Comparative analysis according to the above experimental data is as follows:
1. the actual output power of the example was 4.3kw, the actual output power of the comparative example was 5.5kw, and the circular saw using the composite diamond saw head according to the present invention had a 21.8% reduction in energy consumption compared to the circular saw of the prior art.
2. The circular saw using the composite type diamond saw head of the present invention completed 375m at the same time2Cutting load of (1), cutting load of comparative example was 270m2Compared with the circular saw in the prior art, the cutting efficiency of the circular saw using the composite diamond saw head is improved by about 39%; after cutting, the disc saw of the embodiment has good overall quality and no bad phenomenon of diamond particle falling, while the disc saw of the comparative example has the condition that part of saw heads are burnt out and discolored and about 30 diamond particles fall off; the holding force, the heat resistance and the chip removal condition of the diamond particles of the circular saw using the composite diamond saw head are obviously improved compared with the circular saw in the prior art, and the service life is good.
In summary, in the circular saw using the composite diamond saw head of the present invention, the plurality of first diamond particles 22 and the first blade blank 21 are injection molded and pressed into a whole, so that the first diamond particles 22 have a better holding force and are not easy to fall off; the diamond saw head 2 is formed into a gapless whole by pressing, sintering and fusing, and a carbonized alloy film is wrapped between the first diamond particles 22 and the blind holes 211, so that the diamond saw head has good heat resistance and tensile strength, the cutting endurance strength of the saw head 2 can be improved, and the cutting speed of the circular saw using the composite diamond saw head can be further improved.
As shown in fig. 1 to 6, the diamond saw head 2 includes four first blades composed of four first blade blanks 21 and a plurality of first diamond particles 22 on two sides, and a second blade composed of one second blade blank 23 and a plurality of second diamond particles 24, which has good cutting force and good cost advantage.
The blind hole 211 and the first blade blank 21 are integrally formed, so that the supporting force of the diamond particles 22 can be improved, the first diamond particles 22 embedded in the blind hole 211 have better stability and holding force, the first diamond particles 22 are not easy to fall off in the using process, and the circular saw using the composite diamond saw head has a good service life.
As shown in fig. 2 and 3, the blind holes 211 are sequentially arranged on the left side surface or the right side surface of the first blade blank 21 from top to bottom at intervals; the tops of the first diamond particles 22 positioned on the left outer side and the right outer side of the diamond saw head 2 are exposed out of the outer sides; the messenger the blade direction of the circular saw of use compound diamond saw head arrange and have four rows of first diamond granule 22 to have stronger cutter power, can stand out behind the left and right sides face edging and have more than one hundred fifty orderly first diamond granule 22 of arrangement, have good chip removal speed, can effectively improve the radiating efficiency and the life of the circular saw of use compound diamond saw head.
Further, the invention also provides a preparation method of the circular saw using the composite diamond saw head, wherein the first blade blank 21 with the plurality of blind holes 211 is integrally formed through injection molding, and the four first blade blanks 21 with the first diamond particles 22 embedded in all the blind holes 211 are firstly fused into a whole through warm pressing and then sintered under the conditions of vacuum, oxygen and high pressure, so that the granulating liquid wrapped on the surfaces of the first diamond particles 22 forms a carbonized metal film, the binding force of the first diamond particles 22 on the blind holes 211 is improved, the holding force of the first diamond particles 22 is improved, and the service life of the prepared circular saw using the composite diamond saw head is prolonged. And the preparation process is simple and simple in facilities, and mass production is easy to realize.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
The technical principle of the present invention is described above in connection with specific embodiments. The description is only intended to explain the principles of the invention; and should not be construed as limiting the scope of the invention in any way. Based on the explanations herein; other embodiments of the invention will occur to those skilled in the art without the exercise of inventive faculty; all of which fall within the scope of the present invention.
Claims (10)
1. A circular saw using composite diamond saw heads is characterized by comprising a plurality of circular saw blades, wherein a plurality of diamond saw heads are welded at intervals on saw tooth positions in the cutting edge direction of the saw blades; the diamond saw head protrudes outwards from the edge of the cutting edge direction of the saw blade;
the diamond saw head comprises four first blade blanks, one second blade blank, a plurality of first diamond particles and a plurality of second diamond particles, the first blade blanks are averagely divided into two groups, every two first blade blanks in the same group are abutted against each other, the two groups of first blade blanks are abutted against two side faces, perpendicular to the cutting direction, of the second blade blanks respectively, and the second blade blanks are filled with the plurality of second diamond particles;
more than one hundred and fifty blind holes are formed in the left side surface of the first blade blank body on the left side; the right side surface of the first blade blank body positioned on the right side is also provided with more than one hundred and fifty blind holes; the blind holes are orderly arranged on the left side surface or the right side surface of the first blade blank body at intervals from top to bottom;
the first diamond particles are embedded in the blind holes, and the tops of the first diamond particles positioned on the left outer side and the right outer side of the diamond saw head are exposed out of the outer sides;
the first blade blank including a plurality of blind holes is integrally formed; the diamond saw head is fused into a gapless integral body through pressure sintering.
2. A circular saw using a composite type diamond saw head according to claim 1, wherein the blind holes are arranged at regular intervals, and the diameter of the blind holes is 1.1 to 1.2 times the diameter of the first diamond particles;
the first diamond particles have a particle size of 0.425 to 0.500mm, and the first blade blank comprises a total volume of the first diamond particles in a concentration of 16 to 20% by volume of the first blade blank;
the particle size of the second diamond particles is 0.30-0.35mm, and the total volume of the second diamond particles which are randomly distributed and included in the second blade blank accounts for 12-15% of the volume concentration of the second blade blank;
the distance between two adjacent blind holes is 1.5-2.5 times of the aperture of each blind hole;
the distance between the left outer side surface and the right outer side surface of the diamond saw head is 6.8-7.2 mm;
the outer side surface of the diamond saw head, which is far away from the center, is also provided with a plurality of chip removal holes.
3. A circular saw using a composite type diamond saw head according to claim 1, wherein the surface of the first diamond particle is covered with a carbonized alloy film, and the carbonized alloy film is further covered in a gap between the first diamond particle and the blind hole;
the raw materials of the carbonized alloy film comprise metal molybdenum micro powder and metal tungsten micro powder, and the mass ratio of the metal molybdenum micro powder to the metal tungsten micro powder is 1: 1.
4. The circular saw using the composite type diamond saw head as claimed in claim 1, wherein the first blade blank and the second blade blank are both formed by injection molding of alloy powder and injection molding adhesive, and the mass percentages of the alloy powder and the injection molding adhesive are 85-95% and 5-15%, respectively;
the alloy powder comprises the following components in percentage by mass: 12-18% of metal cobalt powder, 25-35% of metal copper powder, 6-12% of metal nickel powder, 2-5% of metal tin powder and 39-45% of metal iron powder; the granularity of the alloy powder is 10-20 mu mm;
the injection molding adhesive comprises the following raw materials in percentage by mass: 30-45% of paraffin, 10-20% of microcrystalline paraffin, 10-15% of vinyl acetate vinyl, 5-10% of atactic polypropylene, 15-20% of high-density polyethylene, 1-2% of dioctyl phthalate, 1-2% of stearic acid and 0.5-1% of oleic acid.
5. A preparation method of a composite diamond saw head is characterized in that the method is used for preparing the circular saw using the composite diamond saw head as claimed in any one of claims 1 to 4, and comprises a diamond particle granulation step, a first blade blank injection molding step, a first blade laminating body temperature and pressure forming step, a diamond saw head injection molding step and a diamond saw head pressure sintering step;
the injection molding step of the first blade blank comprises the following steps:
s1) respectively weighing alloy powder and an injection molding adhesive according to the mass percentage, uniformly mixing, putting into a kneader, kneading for 2 hours at 160-170 ℃, cooling and crushing to prepare an alloy injection molding feed;
s2) feeding the alloy into an injection molding feeder, and performing injection molding at 170-180 ℃ by using a first mold to obtain a first blade blank with a plurality of orderly arranged blind holes on the same side.
6. The method for preparing the composite diamond saw head according to claim 5, wherein in the step S1), the mass percentages of the alloy powder and the injection molding adhesive are 85-95% and 5-15%, respectively;
the alloy powder comprises the following components in percentage by mass: 12-18% of metal cobalt powder, 25-35% of metal copper powder, 6-12% of metal nickel powder, 2-5% of metal tin powder and 39-45% of metal iron powder; the granularity of the alloy powder is 10-20 mu mm;
the injection molding adhesive comprises the following raw materials in percentage by mass: 30-45% of paraffin, 10-20% of microcrystalline paraffin, 10-15% of vinyl acetate vinyl, 5-10% of atactic polypropylene, 15-20% of high-density polyethylene, 1-2% of dioctyl phthalate, 1-2% of stearic acid and 0.5-1% of oleic acid;
in step S2), the total volume of all the blind holes accounts for 18-20% of the volume of the first insert blank.
7. The method for preparing a composite diamond saw head according to claim 5, wherein the diamond particle granulating step comprises:
p1) weighing the metal molybdenum micro powder, the metal tungsten micro powder and the rosin powder respectively according to the weight ratio of 2:2:5 to prepare mixed metal micro powder;
p2) adding the mixed metal powder into absolute ethyl alcohol, stirring under the condition of constant-temperature water bath at 50 ℃ until rosin powder is completely dissolved, and preparing a granulating liquid containing suspended metal micro powder;
p3) screening first diamond particles by a 35-40 mesh filter screen, putting the screened first diamond particles into a roller type granulator, starting the granulator to rotate, spraying the granulating liquid on the surfaces of the first diamond particles, starting an exhaust device of the granulator until the absolute ethyl alcohol is completely volatilized, putting zirconia ceramic balls into the granulator, and rotationally stirring the mixture for 30 minutes to obtain granules of the first diamond particles;
a first blade pressing body temperature and pressure forming step:
q1) putting the granules into each blind hole of the first blade blank, and heating for 2 minutes by using hot air at the temperature of 70-80 ℃ to prepare a pre-cured first blade mixture;
q2) taking four first blade mixtures, stacking the four first blade mixtures in pairs in a group in the direction that the blind holes face upwards to form two groups, and putting the first blade mixtures in the first group or the second group into a warm-pressing die in the direction that the blind holes face upwards;
q3) putting the diamond saw head injection molding body into a warm-pressing mould, putting a pressing plate of the warm-pressing mould above the diamond saw head injection molding body, heating and pressing, and keeping constant temperature and constant pressure for 3-5 minutes to respectively prepare two first blade pressing bodies.
8. The method for preparing a composite diamond saw head according to claim 7, wherein in the step P2), the mixing mass ratio of the mixed metal powder to the absolute ethyl alcohol is 1: 1;
in the step P3), the mass ratio of the first diamond particles to the zirconia ceramic balls is 1:2, and the diameters of the zirconia ceramic balls are 2 mm;
in the step Q3), the temperature for heating and pressing is 100-150 ℃, and the pressure is 20-30T.
9. The method for preparing the composite diamond saw head according to claim 7, wherein the step of injection molding the diamond saw head comprises the following steps:
r1) adding second diamond particles accounting for 12-15% of the volume of the alloy injection molding feed into the alloy injection molding feed, and uniformly mixing and stirring to prepare a second blade mixture;
r2) placing a first blade pressing body in a second injection mould according to the direction that a blind hole faces downwards, and adding a second blade mixed material which is 1.5 times of the volume of the first blade mixed body above the first blade pressing body; placing a second first blade pressing body above the second blade mixture in a direction that the blind hole faces downwards;
r3) is molded by injection at 170-180 ℃ to prepare a diamond saw head injection molding body with a plurality of chip removal holes on the top surface;
the diamond saw head pressure sintering step comprises the following steps:
t1) putting the diamond saw head injection molding body into a trichloroethylene solution at a constant temperature, soaking for 24 hours for solvent degreasing, taking out and drying to obtain a diamond saw head degreased body;
t2) putting the diamond saw head degreased body into a vacuum sintering furnace, heating to above 800 ℃ and vacuumizing, then adding inert gas for pressurization, sintering for 0.5 hour under constant temperature and constant pressure, naturally cooling to room temperature, and thus obtaining the diamond saw head 2.
10. The method for preparing the composite diamond saw head according to claim 9, wherein in the step T1), the constant temperature is 50-60 ℃;
in the step T2), the inert gas is argon, the sintering constant temperature is 920 ℃, and the constant pressure is 10 MPa.
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