CN108748702B - Diamond saw blade - Google Patents
Diamond saw blade Download PDFInfo
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- CN108748702B CN108748702B CN201810620018.XA CN201810620018A CN108748702B CN 108748702 B CN108748702 B CN 108748702B CN 201810620018 A CN201810620018 A CN 201810620018A CN 108748702 B CN108748702 B CN 108748702B
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- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 215
- 239000010432 diamond Substances 0.000 title claims abstract description 215
- 238000005520 cutting process Methods 0.000 claims abstract description 127
- 229910052751 metal Inorganic materials 0.000 claims abstract description 123
- 239000002184 metal Substances 0.000 claims abstract description 123
- 239000000758 substrate Substances 0.000 claims abstract description 89
- 239000011159 matrix material Substances 0.000 claims abstract description 59
- 239000011253 protective coating Substances 0.000 claims abstract description 26
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 25
- 239000000956 alloy Substances 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims description 171
- 239000002245 particle Substances 0.000 claims description 64
- 229910000831 Steel Inorganic materials 0.000 claims description 57
- 239000010959 steel Substances 0.000 claims description 57
- 238000002156 mixing Methods 0.000 claims description 40
- 238000005245 sintering Methods 0.000 claims description 32
- 229940057995 liquid paraffin Drugs 0.000 claims description 30
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 29
- 229910052799 carbon Inorganic materials 0.000 claims description 29
- 238000005507 spraying Methods 0.000 claims description 23
- 238000007731 hot pressing Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 14
- 238000000465 moulding Methods 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 7
- 229910016347 CuSn Inorganic materials 0.000 claims description 5
- 230000017525 heat dissipation Effects 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000003466 welding Methods 0.000 description 85
- 238000007750 plasma spraying Methods 0.000 description 31
- 239000002131 composite material Substances 0.000 description 27
- 239000000463 material Substances 0.000 description 27
- 238000000227 grinding Methods 0.000 description 26
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 25
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 24
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 24
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 23
- 238000001035 drying Methods 0.000 description 17
- 239000003973 paint Substances 0.000 description 17
- 239000010949 copper Substances 0.000 description 16
- 239000011572 manganese Substances 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 13
- 239000004567 concrete Substances 0.000 description 10
- 238000005498 polishing Methods 0.000 description 10
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 9
- 229910052709 silver Inorganic materials 0.000 description 9
- 239000004332 silver Substances 0.000 description 9
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 9
- 238000000498 ball milling Methods 0.000 description 8
- 230000035515 penetration Effects 0.000 description 8
- 238000005476 soldering Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- 150000003624 transition metals Chemical class 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 238000010330 laser marking Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
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Classifications
-
- 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
- B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a diamond saw blade, belonging to the technical field of diamond tools. The diamond saw blade comprises a circular metal substrate and a plurality of diamond tool bits arranged on the outer end face of the circular metal substrate, wherein chip grooves are formed between the adjacent diamond tool bits, a circular protective coating is formed on the surface, close to the diamond tool bits, of the circular metal substrate, and the circular protective coating consists of a metal intermediate layer in contact with the circular metal substrate and a hard alloy layer arranged on the metal intermediate layer. The annular metal matrix adopted by the diamond saw blade is provided with the annular wear-resistant protective coating, so that the metal matrix is effectively prevented from being eroded by cutting chips, the heat dissipation of the metal matrix is improved, the vibration between the matrix and the diamond tool bit is reduced, and the service life and the cutting stability of the diamond saw blade are favorably prolonged.
Description
Technical Field
The invention relates to the technical field of diamond tools, in particular to a diamond saw blade and a preparation method thereof.
Background
The diamond saw blade is widely applied to processing of hard and brittle materials such as concrete, stone, ceramics and the like. Diamond saw blades generally consist of a circular base body with diamond tips welded to the outer edges of the base body. The diamond tool bit plays a role in cutting during use, the tool bit is continuously consumed in the cutting process, and the diamond in the tool bit plays a role in cutting. Because the grain diameter of the artificial diamond particles produced in an industrial way is usually 15-200 meshes, the diamond particles can play a cutting role only by being wrapped in a metal matrix in application, and the wrapping effect determines the cutting efficiency of the diamond particles. Because the diamond particles are randomly wrapped in the metal matrix, when the diamond particle cutting machine works, the matrix material is worn away firstly to enable the diamond particles to protrude out of the surface of the matrix and work as a micro cutting edge, matrix powder needs to be worn at a matched speed, and the matrix material can keep high holding force on the diamond, so that good self-sharpening performance and cutting efficiency are obtained. In addition to the metal matrix, the morphology of the diamond tip also has a significant effect on the cutting efficiency of the diamond. In order to improve the cutting efficiency, a sandwich cutter head is developed in the prior art, compared with a block cutter head, the sandwich cutter head increases the free surface of a brittle and hard non-metal material such as a stone material which is sawed, the stone material is easier to break, the cutting sharpness is improved, the cutting efficiency is improved, the power consumption is reduced, the sawing cost is reduced, however, the undercut effect of cutting scraps on the bottom of the diamond cutter head is aggravated when the sandwich cutter head is used, the sandwich cutter head is easy to separate and break, the diamond cutter head has to be replaced earlier, the material of the diamond cutter head which does not exert the cutting effect is wasted, and the machining efficiency of cutting operation is reduced due to frequent replacement of the cutter head.
Disclosure of Invention
In order to solve the above technical problems in the prior art, an object of the present invention is to provide a diamond saw blade and a method for manufacturing the same.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
the utility model provides a diamond saw blade, includes circular metal base member and sets up a plurality of diamond segments on the outer terminal surface of circular metal base member to be provided with chip groove, its characterized in that between the adjacent diamond segment: and a circular protective coating is formed on the surface of the circular metal substrate, which is close to the diamond tool bit, and the protective coating consists of a metal intermediate layer which is in contact with the metal substrate and a hard alloy layer arranged on the metal intermediate layer.
The diamond tool bit is combined with the round metal base body through hot-pressing sintering, or the diamond tool bit is welded on the round metal base body.
Wherein the metal intermediate layer is composed of 20.1-22.0 wt% of Ni, 12.2-13.0 wt% of Mn, 1.5-2.5 wt% of Co, and the balance of Cu and inevitable impurities.
Wherein the hard alloy layer comprises at least one selected from carbides, nitrides or borides of transition metals selected from W, Ti, Cr, V, Zr or Nb.
The diamond tool bit comprises a middle cutting layer and side cutting layers positioned on two sides of the middle cutting layer, a metal matrix layer is arranged between the middle cutting layer and the side cutting layers, and the hardness of each side cutting layer is greater than that of each middle cutting layer.
The middle cutting layer and the side cutting layer are formed by hot-pressing and sintering matrix metal and diamond particles; the hot-pressing sintering temperature is 675-750 ℃, and the pressure is 200-300 kg/cm2。
The matrix metal of the middle cutting layer consists of 10.0-12.0 wt% of Cu powder, 1-3wt% of Mn powder, 1.0-2.5 wt% of Co powder, 8.0-10.0 wt% of high-carbon ferrochrome powder, 0.1-0.5wt% of liquid paraffin and the balance of pre-alloy powder.
The matrix metal of the side cutting layer consists of 6.0-8.0 wt% of Cu powder, 1-3wt% of Mn powder, 1.0-2.5 wt% of Co powder, 8.0-10.0 wt% of high-carbon ferrochrome powder, 3.0-5.0 wt% of WC powder, 0.1-0.5wt% of liquid paraffin and the balance of pre-alloy powder.
Wherein the high-carbon ferrochrome powder contains 62.0 to 72.0wt% of Cr, 9.5wt% of C, 0.50 to 0.10wt% of Si, and the balance of Fe and inevitable impurities.
Wherein the prealloyed powder is CuSn prealloyed powder, and the Fisher particle size of the prealloyed powder is 6-8 mu m; the pre-alloyed powder contains 14.2-15.0 wt% of Sn, and the balance of Cu.
Compared with the prior art, the diamond saw blade has the following beneficial effects:
(1) the annular metal matrix adopted by the diamond saw blade is provided with the annular wear-resistant protective coating, so that the metal matrix is effectively prevented from being eroded by cutting chips, the heat dissipation of the metal matrix is improved, and the vibration between the matrix and the diamond tool bit is reduced, thereby being beneficial to prolonging the service life and the cutting stability of the diamond saw blade.
(2) The multilayer composite diamond tool bit adopted by the diamond saw blade is applied to cutting and processing of concrete, so that the using amount of rare metals is reduced, the hot-pressing sintering temperature of the tool bit is low, the cutting performance of diamond particles is fully exerted, and the cutting efficiency of concrete materials is improved.
Drawings
Fig. 1 is a schematic view showing the construction of a diamond saw blade according to the present invention.
Fig. 2 is a schematic sectional view taken along a-a of fig. 1.
Fig. 3 is a schematic view of a composite diamond tip used in the diamond saw blade of the present invention.
Detailed Description
The diamond saw blade of the present invention will be further described with reference to specific examples to assist those skilled in the art in a more complete, accurate and thorough understanding of the inventive concepts and solutions of the present invention.
As shown in fig. 1, the diamond saw blade of the present invention includes a circular metal base 10, and the circular metal base 10 is processed into a circle of a predetermined diameter and thickness from the metal base. The metal substrate 10, which is used as a main body for supporting the diamond segments 20, should have high strength, and be not easily deformed and have good toughness under use conditions, the metal substrate 10 must have good rigidity under cutting operation conditions to prevent deformation during cutting, and in addition, under cutting operation conditions, the metal substrate may be elastically deformed under the combined action of tangential force and normal force during use, so that it is required to ensure certain elasticity and toughness of the metal substrate, and since a large amount of frictional heat is accompanied during cutting operation of the diamond segments and a cutting object such as concrete, it is required that the metal substrate and the diamond segments have substantially equivalent thermal friction coefficients, especially under dry cutting operation conditions without forced cooling liquid. Therefore, steel-based or nickel-based substrates are generally used as the metal substrate, and steel-based substrates are preferable from the viewpoint of cost, and for example, 50Mn2V, 65Mn, 75Cr1, 8CrV, etc. can be used for circular metal substrates for high-frequency welding, and for example, 25CrMo, 28CrMo, 35CrMo, etc. can be used for circular metal substrates for laser welding. The circular metal base 10 is centrally provided with a central mounting hole 11, the mounting hole 11 is used for mounting a driving shaft or a working spindle, and an auxiliary mounting hole 12 is also provided for mounting a flange and the like, the auxiliary mounting hole 12 is generally arranged at the periphery of the central mounting hole 11, and the diameter of the auxiliary mounting hole 12 is generally smaller than that of the central mounting hole 11. In addition, the circular metal base 10 may be further provided with a plurality of heat dissipation holes 13, and the heat dissipation holes 13 may help to dissipate heat during the cutting operation and prevent thermal deformation of the circular metal base 10. The round metal substrate 10 is further provided with chip grooves 15 between adjacent diamond segments 20, and the diamond segments 20 are welded on the outer end surface of the round steel substrate 10 by a welding method such as high-frequency welding or laser welding (of course, the diamond segments 20 and the round metal substrate 10 can also be directly bonded by hot-pressing sintering). The surface of the circular metal substrate 10 adjacent to the diamond tip 20 is formedThe annular protective coating 30 is arranged, and the erosion of concrete scraps generated in the cutting action of concrete to the area near the outer circumference of the circular metal matrix 10 can be effectively prevented by the annular protective coating 30, so that the abnormal failure of the diamond tool bit in the cutting operation process, such as the separation and fracture of the diamond tool bit and the circular metal matrix, can be effectively prevented, and in addition, the recycling of the circular metal matrix can be effectively ensured; also by providing the annular protective coating 30, even in the case where the diamond segments are provided as a multilayer composite diamond segment, the risk of separation and fracture of the segment from the circular metal substrate can be avoided. Further, as shown in fig. 2, the protective coating 30 is composed of a metal intermediate layer 31 in contact with the metal substrate 10 and a hard alloy layer 32 provided on the metal intermediate layer 31. The protective coating 30 may be prepared by a conventional coating method such as a vacuum plating (sputtering, plasma deposition) plating method or a spray coating method, is preferably prepared by spray coating, more preferably by a plasma spray coating method, from the viewpoint of economy and performance of the protective coating, and consists of 20.1 to 22.0wt% of Ni, 12.2 to 13.0wt% of Mn, 1.5 to 2.5wt% of Co, and the balance of Cu and inevitable impurities, and has not only a coefficient of thermal expansion comparable to that of a steel substrate but also better wettability with respect to a hard alloy layer as compared with a conventional bronze metal intermediate layer, thereby significantly improving adhesion between the hard alloy layer and a metal substrate, particularly ensuring good adhesion between the hard alloy layer and the metal substrate even under the condition of being subjected to a plurality of high temperature thermal cycles (temperature cycles between high temperature and room temperature at the time of cutting operation), the thickness of the metal intermediate layer is 0.05-0.25 mm. In the present invention, the hard alloy layer usually contains at least one kind of hard particles selected from carbides, nitrides, borides, and the like of a transition metal selected from W, Ti, Cr, V, Zr, or Nb, and the hard alloy layer may further contain a binder such as a cobalt-based, nickel-based, iron-based, and the like, and may further contain an alloy element such as Cr, W, Si, B, Ru, and the like,preferably, the weight percentage of the hard particles in the hard alloy layer is generally more than 50%, more preferably more than 75%, the thickness of the hard alloy layer is 0.05 to 0.25mm, and the hard particles are preferably WC. Preferably, the hard alloy layer preferably contains 80 to 88wt% of WC, 6 to 10wt% of Co, and 4 to 10wt% of Ni. As shown in fig. 3, in the present invention, the diamond segments 20 include a middle cutting layer 21, and side cutting layers 22 on both sides of the middle cutting layer 21, a metal matrix layer 23 is disposed between the middle cutting layer 21 and the side cutting layers 22, and the hardness of the side cutting layers 22 is greater than that of the middle cutting layer 21. Specifically, the side cut layer 22, the metal carcass layer 23, the middle cut layer 21, the metal carcass layer 23, and the side cut layer 22 are sequentially arranged in a direction perpendicular to the surface of the circular metal base (i.e., the normal direction of the circular metal base). The thickness of the single cutting layer (middle cutting layer or side cutting layer) is 1.5-3.0 mm, preferably 2.0-3.0 mm. The thickness of the single metal matrix layer is 0.8-1.2 mm. In the invention, the middle cutting layer and the side cutting layer are formed by sintering the matrix metal and the diamond particles through hot pressing. The matrix metal of the middle cutting layer consists of 10.0-12.0 wt% of Cu powder, 1-3wt% of Mn powder, 1.0-2.5 wt% of Co powder, 8.0-10.0 wt% of high-carbon ferrochrome powder, 0.1-0.5wt% of liquid paraffin and the balance of pre-alloy powder. The matrix metal of the side cutting layer consists of 6.0-8.0 wt% of Cu powder, 1-3wt% of Mn powder, 1.0-2.5 wt% of Co powder, 8.0-10.0 wt% of high-carbon ferrochrome powder, 3.0-5.0 wt% of WC powder, 0.1-0.5wt% of liquid paraffin and the balance of pre-alloy powder. For cutting concrete, the concentration of the adopted diamond particles is 1.5-3.0 wt% of the weight of matrix metal. The prealloying powder is CuSn prealloying powder, and the Fisher particle size of the prealloying powder is 6-8 mu m; the pre-alloyed powder contains 14.2-15.0 wt% of Sn, and the balance of Cu. The high-carbon ferrochrome powder contains 62.0-72.0 wt% of Cr, 9.5wt% of C, 0.50-0.10 wt% of Si, and the balance of Fe and inevitable impurities. The high carbon ferrochrome powder described in the present invention is generally used for iron-based carcass metals, but the inventors found that applying it to a base powder mainly composed of CuSn pre-alloy powder and securing the carcass pair by introducing a small amount of WC powder into the side cut layerThe holding power of diamond particle to the matrix hardness that forms is moderate, can keep the good sharp nature of oneself of diamond particle when cutting the concrete, makes the synchronism of side cutting layer and middle cutting layer to the concrete cutting moreover, has improved cutting stability, and then has also improved holistic cutting performance of diamond saw blade and life. Specifically, the matrix metal can enable the temperature of thermal sintering to be not higher than 750 ℃, and the damage of sintering to diamond particles is remarkably reduced by performing hot-pressing sintering molding at the sintering temperature of not higher than 750 ℃. Further preferably, the hot-pressing sintering temperature is 675-750 ℃, and the pressure is 200-300 kg/cm2。
As an example, the diamond saw blade of the present invention may be prepared by the following method:
1. according to the drawing requirements, a 25CrMo steel plate is selected, and is tempered, ground into a plane, ground into an inner hole, ground into an outer circle and deburred to manufacture a round steel substrate after laser cutting.
2. Uniformly mixing matrix metal and diamond particles, performing cold press molding to form a diamond tool bit blank, performing hot press sintering, and grinding with a grinding wheel abrasive belt to manufacture the diamond tool bit, wherein the granularity of the adopted diamond particles is 50/60, the temperature of the hot press sintering is 675-750 ℃, and the pressure is 200-300 kg/cm2And keeping the temperature for 100-240 seconds.
3. Laser welding
Adjusting the light spot of the laser welding machine to the proper position of the diamond tool bit and the round steel substrate, starting the laser welding machine to weld the diamond tool bit and the round steel substrate together, and welding the diamond tool bit and the round steel substrate at the speed of 600N/mm2The strength standard performs weld strength testing on each diamond tip.
4. High frequency welding
The tool bit and the substrate are arranged on a special high-frequency welding frame, the surface of the substrate is cleaned, the silver soldering flakes are placed, and the tool bit is welded on the side face by adopting high-frequency heating.
5. Plasma spraying
And a circular protective coating is formed on the surface of the circular metal substrate, which is close to the diamond tool bit, and the protective coating consists of a metal intermediate layer which is in contact with the metal substrate and a hard alloy layer arranged on the metal intermediate layer.
6. Polishing, spraying paint and inspecting
Blasting sand to the inner side of the diamond saw blade, grinding the working surface of the diamond saw blade with a grinding wheel to expose the diamond at 600N/mm2The intensity standard is used for detecting the safe welding intensity of each diamond tool bit, unqualified reworking is carried out, surface painting and drying are carried out if the diamond tool bits are qualified, so that the surface is prevented from rusting, and finally silk printing and laser marking are carried out.
The following examples and comparative examples used circular steel substrates having a diameter of 340mm and a thickness of 2.8mm on which 12 diamond tips were provided. The height of diamond segments is 30mm, width is 80mm, and every compound multilayer diamond segments includes 1 middle cutting layer and 2 side cutting layers that thickness is 1.2mm that thickness is 1.5mm, is 0.8mm thick metal matrix layer between middle cutting layer and the side cutting layer.
The diamond particles used in the following examples and comparative examples had a concentration of 2.0wt% based on the weight of the matrix metal, and had a particle diameter of 50/60. The prealloyed powder is CuSn prealloyed powder, the Fisher particle size of the prealloyed powder is 6-8 mu m, and the content of Sn is 15.0 wt%. The high-carbon ferrochrome powder contains 62.0-72.0 wt% of Cr, 9.5wt% of C, 0.50-0.10 wt% of Si, and the balance of Fe and inevitable impurities.
Example 1
1.0kg of copper powder, 0.1kg of manganese powder, 0.12kg of cobalt powder, 1.0kg of high-carbon ferrochrome powder and 7.76kg of prealloy powder are put into a mixing barrel to be mixed for 30 minutes, 0.02kg of liquid paraffin and 0.20kg of diamond particles are added, the materials are continuously mixed for 2 hours, and then the powder is added into a die to be cold-pressed and molded to obtain a blank of an intermediate cutting layer.
Taking 0.6kg of copper powder, 0.1kg of manganese powder, 0.12kg of cobalt powder, 1.0kg of high-carbon ferrochrome powder, 0.4kg of tungsten carbide powder and 7.76kg of prealloy powder, putting the materials into a mixing barrel, mixing for 30 minutes, adding 0.02kg of liquid paraffin and 0.20kg of diamond particles, continuously mixing for 2 hours, adding the powder into a mold, and performing cold press molding to obtain a side cutting layer blank.
1.0kg of copper powder, 0.1kg of manganese powder, 0.12kg of cobalt powder, 1.0kg of high-carbon ferrochrome powder and 7.76kg of prealloy powder are put into a mixing barrel to be mixed for 30 minutes, 0.02kg of liquid paraffin is added, the materials are continuously mixed for 1 hour, and then the powder is added into a die to be cold-pressed and molded to obtain the metal matrix layer blank.
Forming diamond tool bit blanks according to the sequence of the side cutting layer blanks, the metal matrix layer blanks, the middle cutting layer blanks, the metal matrix layer blanks and the side cutting layer blanks, and then carrying out hot-pressing sintering at the temperature of 720 ℃ and under the pressure of 250 kg/cm2The holding time was 200 seconds.
Putting the diamond tool bit and the circular steel substrate together at corresponding positions according to the requirements of a drawing, adjusting the light spot of a laser welding machine to the proper position of the diamond tool bit and the circular steel substrate, starting the laser welding machine to carry out laser welding, welding the diamond tool bit and the circular steel substrate together at the moment of laser penetration, and then welding the diamond tool bit and the circular steel substrate together at the speed of 600N/mm2And the strength standard is used for detecting the welding strength of each diamond tool bit, then a silver soldering lug is used for high-frequency welding, and the surface of the substrate is polished to be bright by using a polishing machine for the energy-saving and high-efficiency diamond saw blade after welding. A circular protective coating is formed on the surface of a circular steel substrate close to a diamond tool bit, firstly, 20.1wt% of Ni, 13.0wt% of Mn, 2.5wt% of Co and the balance of Cu are used for preparing composite powder with the granularity of 360 meshes by mechanical ball milling, high-energy plasma spraying equipment is used for carrying out plasma spraying, the adopted arc current is 500A, the arc voltage is 60V, the powder feeding rate is 40g/min, and a metal intermediate layer with the thickness of 0.25mm is prepared. Then, hard particle composite powder prepared by a sintering method of 8.0wt% of Co, 4.0wt% of Ni and 88wt% of WC, wherein the particle size of the hard particle composite powder is 500 meshes, plasma spraying is carried out by adopting high-energy plasma spraying equipment, the adopted arc current is 500A, the arc voltage is 72V, the powder feeding rate is 50g/min, and a metal intermediate layer with the thickness of 0.15mm is prepared. Grinding the working surface of the diamond tool bit with a special grinding wheel to expose the diamond, spraying paint on the surface, drying to prevent surface rusting, and grinding at 600N/mm2Strength markAnd (5) carrying out welding strength detection on each diamond tool bit in an aligning way, and spraying paint on the surface if the diamond tool bit is qualified and drying.
Example 2
1.2kg of copper powder, 0.3kg of manganese powder, 0.25kg of cobalt powder, 0.8kg of high-carbon ferrochrome powder and 7.42kg of prealloy powder are put into a mixing barrel to be mixed for 30 minutes, 0.03kg of liquid paraffin and 0.20kg of diamond particles are added, the materials are continuously mixed for 2 hours, and then the powder is added into a die to be cold-pressed and molded to obtain a blank of an intermediate cutting layer.
Taking 0.8kg of copper powder, 0.3kg of manganese powder, 0.25kg of cobalt powder, 0.8kg of high-carbon ferrochrome powder, 0.5kg of tungsten carbide powder and 7.32kg of prealloy powder, putting the materials into a mixing barrel, mixing for 30 minutes, adding 0.03kg of liquid paraffin and 0.20kg of diamond particles, continuously mixing for 2 hours, adding the powder into a mold, and performing cold press molding to obtain a side cutting layer blank.
1.2kg of copper powder, 0.3kg of manganese powder, 0.25kg of cobalt powder, 0.8kg of high-carbon ferrochrome powder and 7.42kg of prealloy powder are put into a mixing barrel to be mixed for 30 minutes, 0.03kg of liquid paraffin is added, the materials are continuously mixed for 1 hour, and then the powder is added into a die to be cold-pressed and molded to obtain the metal matrix layer blank.
Forming diamond tool bit blanks according to the sequence of the side cutting layer blanks, the metal matrix layer blanks, the middle cutting layer blanks, the metal matrix layer blanks and the side cutting layer blanks, and then carrying out hot-pressing sintering at the temperature of 720 ℃ and under the pressure of 250 kg/cm2The holding time was 200 seconds.
Putting the diamond tool bit and the circular steel substrate together at corresponding positions according to the requirements of a drawing, adjusting the light spot of a laser welding machine to the proper position of the diamond tool bit and the circular steel substrate, starting the laser welding machine to carry out laser welding, welding the diamond tool bit and the circular steel substrate together at the moment of laser penetration, and then welding the diamond tool bit and the circular steel substrate together at the speed of 600N/mm2And the strength standard is used for detecting the welding strength of each diamond tool bit, then a silver soldering lug is used for high-frequency welding, and the surface of the substrate is polished to be bright by using a polishing machine for the energy-saving and high-efficiency diamond saw blade after welding. Forming a circular protective coating on the surface of a circular steel substrate close to the diamond tool bit, firstly22.0wt% of Ni, 12.2wt% of Mn, 1.5wt% of Co and the balance of Cu, preparing composite powder with the granularity of 360 meshes by adopting mechanical ball milling, carrying out plasma spraying by adopting high-energy plasma spraying equipment, wherein the adopted arc current is 500A, the arc voltage is 60V, the powder feeding rate is 40g/min, and the metal intermediate layer with the thickness of 0.25mm is prepared. Then, hard particle composite powder prepared by a sintering method of 10.0wt% of Co, 2.0wt% of Ni and 88wt% of WC, the particle size of the hard particle composite powder is 500 meshes, plasma spraying is carried out by adopting high-energy plasma spraying equipment, the adopted arc current is 500A, the arc voltage is 72V, the powder feeding rate is 50g/min, and a metal intermediate layer with the thickness of 0.15mm is prepared. Grinding the working surface of the diamond tool bit with a special grinding wheel to expose the diamond, spraying paint on the surface, drying to prevent surface rusting, and grinding at 600N/mm2And (5) detecting the welding strength of each diamond tool bit by using the strength standard, and spraying paint on the surface and drying if the diamond tool bit is qualified.
Example 3
1.1kg of copper powder, 0.2kg of manganese powder, 0.18kg of cobalt powder, 0.9kg of high-carbon ferrochrome powder and 7.59kg of prealloy powder are put into a mixing barrel to be mixed for 30 minutes, 0.03kg of liquid paraffin and 0.20kg of diamond particles are added, the materials are continuously mixed for 2 hours, and then the powder is added into a die to be cold-pressed and molded to obtain a blank of an intermediate cutting layer.
Taking 0.7kg of copper powder, 0.2kg of manganese powder, 0.18kg of cobalt powder, 0.9kg of high-carbon ferrochrome powder, 0.3kg of tungsten carbide powder and 7.69kg of prealloy powder, putting the materials into a mixing barrel, mixing for 30 minutes, adding 0.03kg of liquid paraffin and 0.20kg of diamond particles, continuously mixing for 2 hours, adding the powder into a mold, and performing cold press molding to obtain a side cutting layer blank.
1.1kg of copper powder, 0.2kg of manganese powder, 0.18kg of cobalt powder, 0.9kg of high-carbon ferrochrome powder and 7.59kg of prealloy powder are put into a mixing barrel to be mixed for 30 minutes, 0.03kg of liquid paraffin is added, the materials are continuously mixed for 1 hour, and then the powder is added into a die to be cold-pressed and molded to obtain the metal matrix layer blank.
Cutting the layer blank according to the side edges, the metal body layer blank, the middle cutting layer blank, the metal body layer blank and the side edgesSequentially arranging the cutting layer blanks to form diamond tool bit blanks, and then performing hot-pressing sintering at 720 ℃ under the pressure of 250 kg/cm2The holding time was 200 seconds.
Putting the diamond tool bit and the circular steel substrate together at corresponding positions according to the requirements of a drawing, adjusting the light spot of a laser welding machine to the proper position of the diamond tool bit and the circular steel substrate, starting the laser welding machine to carry out laser welding, welding the diamond tool bit and the circular steel substrate together at the moment of laser penetration, and then welding the diamond tool bit and the circular steel substrate together at the speed of 600N/mm2And the strength standard is used for detecting the welding strength of each diamond tool bit, then a silver soldering lug is used for high-frequency welding, and the surface of the substrate is polished to be bright by using a polishing machine for the energy-saving and high-efficiency diamond saw blade after welding. A circular protective coating is formed on the surface of a circular steel substrate close to a diamond tool bit, firstly, 21.2wt% of Ni, 12.5wt% of Mn, 2.0wt% of Co and the balance of Cu are used for preparing composite powder with the granularity of 360 meshes by mechanical ball milling, high-energy plasma spraying equipment is used for carrying out plasma spraying, the adopted arc current is 500A, the arc voltage is 60V, the powder feeding rate is 40g/min, and a metal intermediate layer with the thickness of 0.25mm is prepared. Then, hard particle composite powder prepared by a sintering method of 6.0wt% of Co, 6.0wt% of Ni and 88wt% of WC, the particle size of the hard particle composite powder is 500 meshes, plasma spraying is carried out by adopting high-energy plasma spraying equipment, the adopted arc current is 500A, the arc voltage is 72V, the powder feeding rate is 50g/min, and a metal intermediate layer with the thickness of 0.15mm is prepared. Grinding the working surface of the diamond tool bit with a special grinding wheel to expose the diamond, spraying paint on the surface, drying to prevent surface rusting, and grinding at 600N/mm2And (5) detecting the welding strength of each diamond tool bit by using the strength standard, and spraying paint on the surface and drying if the diamond tool bit is qualified.
Comparative example 1
1.2kg of copper powder, 0.3kg of manganese powder, 0.25kg of cobalt powder, 0.8kg of high-carbon ferrochrome powder and 7.42kg of prealloy powder are put into a mixing barrel to be mixed for 30 minutes, 0.03kg of liquid paraffin and 0.20kg of diamond particles are added, the materials are continuously mixed for 2 hours, and then the powder is added into a die to be cold-pressed and molded to obtain a blank of an intermediate cutting layer.
1.2kg of copper powder, 0.3kg of manganese powder, 0.25kg of cobalt powder, 0.8kg of high-carbon ferrochrome powder and 7.42kg of prealloy powder are put into a mixing barrel to be mixed for 30 minutes, 0.03kg of liquid paraffin and 0.20kg of diamond particles are added, the materials are continuously mixed for 2 hours, and then the powder is added into a die to be cold-pressed and molded to obtain a side cutting layer blank.
1.2kg of copper powder, 0.3kg of manganese powder, 0.25kg of cobalt powder, 0.8kg of high-carbon ferrochrome powder and 7.42kg of prealloy powder are put into a mixing barrel to be mixed for 30 minutes, 0.03kg of liquid paraffin is added, the materials are continuously mixed for 1 hour, and then the powder is added into a die to be cold-pressed and molded to obtain the metal matrix layer blank.
Forming diamond tool bit blanks according to the sequence of the side cutting layer blanks, the metal matrix layer blanks, the middle cutting layer blanks, the metal matrix layer blanks and the side cutting layer blanks, and then carrying out hot-pressing sintering at the temperature of 720 ℃ and under the pressure of 250 kg/cm2The holding time was 200 seconds.
Putting the diamond tool bit and the circular steel substrate together at corresponding positions according to the requirements of a drawing, adjusting the light spot of a laser welding machine to the proper position of the diamond tool bit and the circular steel substrate, starting the laser welding machine to carry out laser welding, welding the diamond tool bit and the circular steel substrate together at the moment of laser penetration, and then welding the diamond tool bit and the circular steel substrate together at the speed of 600N/mm2And the strength standard is used for detecting the welding strength of each diamond tool bit, then a silver soldering lug is used for high-frequency welding, and the surface of the substrate is polished to be bright by using a polishing machine for the energy-saving and high-efficiency diamond saw blade after welding. A circular protective coating is formed on the surface of a circular steel substrate close to a diamond tool bit, firstly, 22.0wt% of Ni, 12.2wt% of Mn, 1.5wt% of Co and the balance of Cu are used for preparing composite powder with the granularity of 360 meshes by mechanical ball milling, high-energy plasma spraying equipment is used for carrying out plasma spraying, the adopted arc current is 500A, the arc voltage is 60V, the powder feeding rate is 40g/min, and a metal intermediate layer with the thickness of 0.25mm is prepared. Then preparing hard particle composite powder by a sintering method of 10.0wt% of Co, 2.0wt% of Ni and 88wt% of WC, wherein the particle size of the hard particle composite powder is 500 meshes, and adopting high-energy plasmaPlasma spraying is carried out by daughter spraying equipment, the adopted arc current is 500A, the arc voltage is 72V, the powder feeding rate is 50g/min, and a metal intermediate layer with the thickness of 0.15mm is prepared. Grinding the working surface of the diamond tool bit with a special grinding wheel to expose the diamond, spraying paint on the surface, drying to prevent surface rusting, and grinding at 600N/mm2And (5) detecting the welding strength of each diamond tool bit by using the strength standard, and spraying paint on the surface and drying if the diamond tool bit is qualified.
Comparative example 2
1.2kg of copper powder, 0.3kg of manganese powder, 0.25kg of cobalt powder and 8.22kg of prealloyed powder are put into a mixing barrel to be mixed for 30 minutes, 0.03kg of liquid paraffin and 0.20kg of diamond particles are added, the materials are continuously mixed for 2 hours, and then the powder is added into a die to be cold-pressed and molded to obtain a blank of the middle cutting layer.
Taking 0.8kg of copper powder, 0.3kg of manganese powder, 0.25kg of cobalt powder, 0.5kg of tungsten carbide powder and 8.12kg of prealloy powder, putting the mixture into a mixing barrel, mixing for 30 minutes, adding 0.03kg of liquid paraffin and 0.20kg of diamond particles, continuously mixing for 2 hours, adding the powder into a die, and carrying out cold press molding to obtain a side cutting layer blank.
1.2kg of copper powder, 0.3kg of manganese powder, 0.25kg of cobalt powder and 8.22kg of prealloy powder are put into a mixing barrel to be mixed for 30 minutes, 0.03kg of liquid paraffin is added, the materials are continuously mixed for 1 hour, and then the powder is added into a die to be cold-pressed and molded to obtain the metal matrix layer blank.
Forming diamond tool bit blanks according to the sequence of the side cutting layer blanks, the metal matrix layer blanks, the middle cutting layer blanks, the metal matrix layer blanks and the side cutting layer blanks, and then carrying out hot-pressing sintering at the temperature of 720 ℃ and under the pressure of 250 kg/cm2The holding time was 200 seconds.
Putting the diamond tool bit and the circular steel substrate together at corresponding positions according to the requirements of a drawing, adjusting the light spot of a laser welding machine to the proper position of the diamond tool bit and the circular steel substrate, starting the laser welding machine to carry out laser welding, welding the diamond tool bit and the circular steel substrate together at the moment of laser penetration, and then welding the diamond tool bit and the circular steel substrate together at the speed of 600N/mm2Strength markAnd (3) detecting the welding strength of each diamond tool bit, then performing high-frequency welding by adopting a silver welding sheet, and polishing the surface brightness of the substrate by using a polishing machine for the energy-saving and efficient diamond saw blade after welding. A circular protective coating is formed on the surface of a circular steel substrate close to a diamond tool bit, firstly, 22.0wt% of Ni, 12.2wt% of Mn, 1.5wt% of Co and the balance of Cu are used for preparing composite powder with the granularity of 360 meshes by mechanical ball milling, high-energy plasma spraying equipment is used for carrying out plasma spraying, the adopted arc current is 500A, the arc voltage is 60V, the powder feeding rate is 40g/min, and a metal intermediate layer with the thickness of 0.25mm is prepared. Then, hard particle composite powder prepared by a sintering method of 10.0wt% of Co, 2.0wt% of Ni and 88wt% of WC, the particle size of the hard particle composite powder is 500 meshes, plasma spraying is carried out by adopting high-energy plasma spraying equipment, the adopted arc current is 500A, the arc voltage is 72V, the powder feeding rate is 50g/min, and a metal intermediate layer with the thickness of 0.15mm is prepared. Grinding the working surface of the diamond tool bit with a special grinding wheel to expose the diamond, spraying paint on the surface, drying to prevent surface rusting, and grinding at 600N/mm2And (5) detecting the welding strength of each diamond tool bit by using the strength standard, and spraying paint on the surface and drying if the diamond tool bit is qualified.
Comparative example 3
1.2kg of copper powder, 0.3kg of manganese powder, 0.25kg of cobalt powder, 0.8kg of tungsten carbide powder and 7.42kg of prealloy powder are put into a mixing barrel to be mixed for 30 minutes, 0.03kg of liquid paraffin and 0.20kg of diamond particles are added, the materials are continuously mixed for 2 hours, and then the powder is added into a die to be cold-pressed and molded to obtain a blank of an intermediate cutting layer.
Taking 0.8kg of copper powder, 0.3kg of manganese powder, 0.25kg of cobalt powder, 1.3kg of tungsten carbide powder and 7.32kg of prealloy powder, putting the mixture into a mixing barrel, mixing for 30 minutes, adding 0.03kg of liquid paraffin and 0.20kg of diamond particles, continuously mixing for 2 hours, adding the powder into a die, and carrying out cold press molding to obtain a side cutting layer blank.
1.2kg of copper powder, 0.3kg of manganese powder, 0.25kg of cobalt powder, 0.8kg of tungsten carbide powder and 7.42kg of prealloy powder are put into a mixing barrel to be mixed for 30 minutes, 0.03kg of liquid paraffin is added, the materials are continuously mixed for 1 hour, and then the powder is added into a die to be cold-pressed and molded to obtain the metal matrix layer blank.
Forming diamond tool bit blanks according to the sequence of the side cutting layer blanks, the metal matrix layer blanks, the middle cutting layer blanks, the metal matrix layer blanks and the side cutting layer blanks, and then carrying out hot-pressing sintering at the temperature of 720 ℃ and under the pressure of 250 kg/cm2The holding time was 200 seconds.
Putting the diamond tool bit and the circular steel substrate together at corresponding positions according to the requirements of a drawing, adjusting the light spot of a laser welding machine to the proper position of the diamond tool bit and the circular steel substrate, starting the laser welding machine to carry out laser welding, welding the diamond tool bit and the circular steel substrate together at the moment of laser penetration, and then welding the diamond tool bit and the circular steel substrate together at the speed of 600N/mm2And the strength standard is used for detecting the welding strength of each diamond tool bit, then a silver soldering lug is used for high-frequency welding, and the surface of the substrate is polished to be bright by using a polishing machine for the energy-saving and high-efficiency diamond saw blade after welding. A circular protective coating is formed on the surface of a circular steel substrate close to a diamond tool bit, firstly, 22.0wt% of Ni, 12.2wt% of Mn, 1.5wt% of Co and the balance of Cu are used for preparing composite powder with the granularity of 360 meshes by mechanical ball milling, high-energy plasma spraying equipment is used for carrying out plasma spraying, the adopted arc current is 500A, the arc voltage is 60V, the powder feeding rate is 40g/min, and a metal intermediate layer with the thickness of 0.25mm is prepared. Then, hard particle composite powder prepared by a sintering method of 10.0wt% of Co, 2.0wt% of Ni and 88wt% of WC, the particle size of the hard particle composite powder is 500 meshes, plasma spraying is carried out by adopting high-energy plasma spraying equipment, the adopted arc current is 500A, the arc voltage is 72V, the powder feeding rate is 50g/min, and a metal intermediate layer with the thickness of 0.15mm is prepared. Grinding the working surface of the diamond tool bit with a special grinding wheel to expose the diamond, spraying paint on the surface, drying to prevent surface rusting, and grinding at 600N/mm2And (5) detecting the welding strength of each diamond tool bit by using the strength standard, and spraying paint on the surface and drying if the diamond tool bit is qualified.
Cutting experiments were performed using the diamond saw blades prepared in examples 1 to 3 and comparative examples 1 to 3,applying a constant pressure to concrete (compressive strength of 300 kgf/cm) by using a cutter (power of 5.0 kW)2) The cutting was carried out (cutting depth: 5cm) and a cutting test was carried out with a cutting length of 200m, and the results of the cutting test are shown in Table 1.
TABLE 1
| Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Average cutting speed (m/min) | 0.81 | 0.87 | 0.83 | 0.72 | 0.65 | 0.85 |
| Cutting speed Range (m/min) | 0.72-0.90 | 0.81-0.96 | 0.76-0.90 | 0.60-0.85 | 0.52-0.82 | 0.60-1.08 |
| Wear Property (m)2/mm） | 2.8 | 3.0 | 2.7 | 2.3 | 1.8 | 2.7 |
Comparative example 4
1.2kg of copper powder, 0.3kg of manganese powder, 0.25kg of cobalt powder, 0.8kg of high-carbon ferrochrome powder and 7.42kg of prealloy powder are put into a mixing barrel to be mixed for 30 minutes, 0.03kg of liquid paraffin and 0.20kg of diamond particles are added, the materials are continuously mixed for 2 hours, and then the powder is added into a die to be cold-pressed and molded to obtain a blank of an intermediate cutting layer.
Taking 0.8kg of copper powder, 0.3kg of manganese powder, 0.25kg of cobalt powder, 0.8kg of high-carbon ferrochrome powder, 0.5kg of tungsten carbide powder and 7.32kg of prealloy powder, putting the materials into a mixing barrel, mixing for 30 minutes, adding 0.03kg of liquid paraffin and 0.20kg of diamond particles, continuously mixing for 2 hours, adding the powder into a mold, and performing cold press molding to obtain a side cutting layer blank.
1.2kg of copper powder, 0.3kg of manganese powder, 0.25kg of cobalt powder, 0.8kg of high-carbon ferrochrome powder and 7.42kg of prealloy powder are put into a mixing barrel to be mixed for 30 minutes, 0.03kg of liquid paraffin is added, the materials are continuously mixed for 1 hour, and then the powder is added into a die to be cold-pressed and molded to obtain the metal matrix layer blank.
Forming diamond tool bit blanks according to the sequence of the side cutting layer blanks, the metal matrix layer blanks, the middle cutting layer blanks, the metal matrix layer blanks and the side cutting layer blanks, and then carrying out hot-pressing sintering at the temperature of 720 ℃ and under the pressure of 250 kg/cm2The holding time was 200 seconds.
Putting the diamond tool bit and the circular steel substrate together at corresponding positions according to the requirements of a drawing, adjusting the light spot of a laser welding machine to the proper position of the diamond tool bit and the circular steel substrate, starting the laser welding machine to carry out laser welding, welding the diamond tool bit and the circular steel substrate together at the moment of laser penetration, and then welding the diamond tool bit and the circular steel substrate together at the speed of 600N/mm2And the strength standard is used for detecting the welding strength of each diamond tool bit, then a silver soldering lug is used for high-frequency welding, and the surface of the substrate is polished to be bright by using a polishing machine for the energy-saving and high-efficiency diamond saw blade after welding. A circular protective coating is formed on the surface of a circular steel substrate close to a diamond tool bit, firstly, 10.0wt% of Ni, 6.0wt% of Mn, 6.0wt% of Sn and the balance of Cu are used for preparing composite powder with the granularity of 360 meshes by mechanical ball milling, high-energy plasma spraying equipment is used for carrying out plasma spraying, the adopted arc current is 500A, the arc voltage is 60V, the powder feeding rate is 40g/min, and a metal intermediate layer with the thickness of 0.25mm is prepared. Then, hard particle composite powder prepared by a sintering method of 10.0wt% of Co, 2.0wt% of Ni and 88wt% of WC, the particle size of the hard particle composite powder is 500 meshes, plasma spraying is carried out by adopting high-energy plasma spraying equipment, the adopted arc current is 500A, the arc voltage is 72V, the powder feeding rate is 50g/min, and a metal intermediate layer with the thickness of 0.15mm is prepared. Grinding the working surface of the diamond tool bit with a special grinding wheel to expose the diamond, spraying paint on the surface, drying to prevent surface rusting, and grinding at 600N/mm2And (5) detecting the welding strength of each diamond tool bit by using the strength standard, and spraying paint on the surface and drying if the diamond tool bit is qualified.
Comparative example 5
1.2kg of copper powder, 0.3kg of manganese powder, 0.25kg of cobalt powder, 0.8kg of high-carbon ferrochrome powder and 7.42kg of prealloy powder are put into a mixing barrel to be mixed for 30 minutes, 0.03kg of liquid paraffin and 0.20kg of diamond particles are added, the materials are continuously mixed for 2 hours, and then the powder is added into a die to be cold-pressed and molded to obtain a blank of an intermediate cutting layer.
Taking 0.8kg of copper powder, 0.3kg of manganese powder, 0.25kg of cobalt powder, 0.8kg of high-carbon ferrochrome powder, 0.5kg of tungsten carbide powder and 7.32kg of prealloy powder, putting the materials into a mixing barrel, mixing for 30 minutes, adding 0.03kg of liquid paraffin and 0.20kg of diamond particles, continuously mixing for 2 hours, adding the powder into a mold, and performing cold press molding to obtain a side cutting layer blank.
1.2kg of copper powder, 0.3kg of manganese powder, 0.25kg of cobalt powder, 0.8kg of high-carbon ferrochrome powder and 7.42kg of prealloy powder are put into a mixing barrel to be mixed for 30 minutes, 0.03kg of liquid paraffin is added, the materials are continuously mixed for 1 hour, and then the powder is added into a die to be cold-pressed and molded to obtain the metal matrix layer blank.
Forming diamond tool bit blanks according to the sequence of the side cutting layer blanks, the metal matrix layer blanks, the middle cutting layer blanks, the metal matrix layer blanks and the side cutting layer blanks, and then carrying out hot-pressing sintering at the temperature of 720 ℃ and under the pressure of 250 kg/cm2The holding time was 200 seconds.
Putting the diamond tool bit and the circular steel substrate together at corresponding positions according to the requirements of a drawing, adjusting the light spot of a laser welding machine to the proper position of the diamond tool bit and the circular steel substrate, starting the laser welding machine to carry out laser welding, welding the diamond tool bit and the circular steel substrate together at the moment of laser penetration, and then welding the diamond tool bit and the circular steel substrate together at the speed of 600N/mm2And the strength standard is used for detecting the welding strength of each diamond tool bit, then a silver soldering lug is used for high-frequency welding, and the surface of the substrate is polished to be bright by using a polishing machine for the energy-saving and high-efficiency diamond saw blade after welding. A circular protective coating is formed on the surface of a circular steel substrate close to a diamond tool bit, firstly, 15.0wt% of Ni, 25wt% of Mn, 7.0wt% of Sn, 2.0 Co and the balance of Cu are used for preparing composite powder with the granularity of 360 meshes by mechanical ball milling, high-energy plasma spraying equipment is used for carrying out plasma spraying, the adopted arc current is 500A, the arc voltage is 60V, the powder feeding rate is 40g/min, and a metal intermediate layer with the thickness of 0.25mm is prepared. Then, hard particle composite powder prepared by a sintering method of 10.0wt% of Co, 2.0wt% of Ni and 88wt% of WC, the particle size of the hard particle composite powder is 500 meshes, plasma spraying is carried out by adopting high-energy plasma spraying equipment, the adopted arc current is 500A, the arc voltage is 72V, the powder feeding rate is 50g/min, and a metal intermediate layer with the thickness of 0.15mm is prepared. Then use specially forGrinding the working surface of the diamond tool bit with a grinding wheel to expose the diamond, spraying paint on the surface, drying to prevent surface rusting, and finally 600N/mm2And (5) detecting the welding strength of each diamond tool bit by using the strength standard, and spraying paint on the surface and drying if the diamond tool bit is qualified.
The protective coatings prepared in examples 2, 4 and 5 were cut, sampled, and then subjected to a thermal cycle test, each sample was subjected to a thermal cycle of 20 times from room temperature to 350 c (20 min) in a heating furnace and then cooled to room temperature (40 min), and then the adhesion strength of the protective coatings prepared in examples 2, 4 and 5 to a steel substrate before and after the thermal cycle test, respectively, was measured (5 samples each were averaged), and the results are shown in table 2.
TABLE 2 bond Strength (MPa)
| Example 2 | Comparative example 4 | Comparative example 5 | |
| Before thermal cycle test | 125 | 128 | 123 |
| After thermal cycle test | 107 | 59 | 43 |
It is to be understood that the present invention is not limited to the above-described embodiments, and various insubstantial modifications of the invention without modification or direct application of the invention to other applications are within the scope of the invention.
Claims (5)
1. The diamond saw blade comprises a circular steel substrate and a plurality of diamond tool bits arranged on the outer end face of the circular steel substrate, wherein a chip removing groove is formed between every two adjacent diamond tool bits, and the diamond saw blade is characterized in that: preparing a circular protective coating on the surface of the circular steel substrate close to the diamond tool bit by a spraying process, wherein the protective coating consists of a metal intermediate layer in contact with the circular steel substrate and a hard alloy layer arranged on the metal intermediate layer; the diamond tool bit comprises a middle cutting layer and side cutting layers positioned on two sides of the middle cutting layer, a metal matrix layer is arranged between the middle cutting layer and the side cutting layers, and the hardness of each side cutting layer is greater than that of the middle cutting layer;
wherein the metal intermediate layer is composed of 20.1-22.0 wt% of Ni, 12.2-13.0 wt% of Mn, 1.5-2.5 wt% of Co, and the balance of Cu and inevitable impurities, and has a thickness of 0.05-0.25 mm; the hard alloy layer contains 80-88 wt% of WC, 6-10 wt% of Co and 4-10 wt% of Ni, and the thickness of the hard alloy layer is 0.05-0.25 mm.
2. The diamond saw blade of claim 1, wherein: the matrix metal of the middle cutting layer consists of 10.0-12.0 wt% of Cu powder, 1-3wt% of Mn powder, 1.0-2.5 wt% of Co powder, 8.0-10.0 wt% of high-carbon ferrochrome powder, 0.1-0.5wt% of liquid paraffin and the balance of pre-alloy powder; the matrix metal of the side cutting layer consists of 6.0-8.0 wt% of Cu powder, 1-3wt% of Mn powder, 1.0-2.5 wt% of Co powder, 8.0-10.0 wt% of high-carbon ferrochrome powder, 3.0-5.0 wt% of WC powder, 0.1-0.5wt% of liquid paraffin and the balance of pre-alloyed powderForming; the pre-alloy powder is CuSn pre-alloy powder, and the middle cutting layer and the side cutting layer are formed by uniformly mixing matrix metal and diamond particles, performing cold press molding to form a diamond tool bit blank and performing hot press sintering; the hot-pressing sintering temperature is 675-750 ℃, and the pressure is 200-300 kg/cm2。
3. The diamond saw blade of claim 1, wherein: the diamond tool bit is combined with the round steel substrate through hot pressing and sintering, or the diamond tool bit is welded on the round steel substrate.
4. The diamond saw blade of claim 2, wherein: the high-carbon ferrochrome powder contains 62.0-72.0 wt% of Cr, 9.5wt% of C, 0.50-0.10 wt% of Si, and the balance of Fe and inevitable impurities.
5. The diamond saw blade of claim 2, wherein: the Fisher size of the prealloyed powder is 6-8 μm; the pre-alloyed powder contains 14.2-15.0 wt% of Sn, and the balance of Cu.
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| CN102001056A (en) * | 2010-09-27 | 2011-04-06 | 安泰科技股份有限公司 | Brazing-hot pressing diamond tool and manufacturing method thereof |
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| CN1265964A (en) * | 2000-05-09 | 2000-09-13 | 石家庄冀凯金刚石制品有限责任公司 | Silencing circular saw disc with damping noise-reducing base body |
| CN101434827B (en) * | 2008-12-17 | 2012-06-13 | 厦门致力金刚石科技股份有限公司 | Grinding medium containing ceramic particle, preparation and use thereof |
| CN107263737A (en) * | 2017-05-22 | 2017-10-20 | 宁波妙力斯五金工具有限公司 | A kind of sintered carbide circular saw |
| CN107639296A (en) * | 2017-10-31 | 2018-01-30 | 南通旭越光电科技有限公司 | A kind of multilayer saw blade |
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2018
- 2018-06-15 CN CN201810620018.XA patent/CN108748702B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102001056A (en) * | 2010-09-27 | 2011-04-06 | 安泰科技股份有限公司 | Brazing-hot pressing diamond tool and manufacturing method thereof |
| CN204955134U (en) * | 2015-09-11 | 2016-01-13 | 江苏友和工具有限公司 | Base member strenghthened type diamond circular saw piece |
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