CN114918487A - Preparation method of laser welding composite brazing saw blade - Google Patents

Preparation method of laser welding composite brazing saw blade Download PDF

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Publication number
CN114918487A
CN114918487A CN202210574128.3A CN202210574128A CN114918487A CN 114918487 A CN114918487 A CN 114918487A CN 202210574128 A CN202210574128 A CN 202210574128A CN 114918487 A CN114918487 A CN 114918487A
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diamond
copper
brazing
cutting
iron
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邱瑜铭
肖双喜
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Jiangsu Fengtai Tools Co ltd
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Jiangsu Fengtai Tools Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D65/00—Making tools for sawing machines or sawing devices for use in cutting any kind of 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/02—Circular saw blades
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C22C9/04—Alloys based on copper with zinc as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • C23C26/02—Coating not provided for in groups C23C2/00 - C23C24/00 applying molten material to the substrate
    • 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
    • B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mining & Mineral Resources (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

The invention relates to a preparation method of a laser welding composite brazing saw blade, and relates to the technical field of diamond tools. The preparation method of the laser welding composite brazing saw blade comprises the following steps: (1) providing a disk substrate comprising a first major surface, a second major surface, and a peripheral sidewall; (2) forming a diamond coating on the first and second major surfaces by brazing; (3) and a plurality of diamond tips are laser welded to the peripheral sidewall. The laser welding composite brazing saw blade prepared by the preparation method can play a role of being similar to a hairbrush in deep cutting to discharge more cutting scraps and sand; the cyclone shape design can greatly reduce the cutting cooling efficiency, so that the cutter head can not be overheated and burnt to cause the passivation of a cutting surface in a high-speed cutting state, and the optimal cutting performance can be kept.

Description

Preparation method of laser welding composite brazing saw blade
Technical Field
The invention relates to the technical field of diamond tools, in particular to a preparation method of a laser welding composite brazing saw blade.
Background
Under the current large background of economic high-speed development, low carbon and environmental protection become great tendency, the foundation construction can not be provided with the diamond saw blade, and the efficient energy-saving tool is certainly favored by users along with the improvement of labor cost in the processes of concrete pouring and engineering construction. However, in the road traffic and building industries, the diamond saw blade is still high in use cost as a consumable material, and the consumption of diamond, metal powder and electric power is huge, so that how to further reduce the production cost and reduce the environmental pollution is an important subject facing the diamond tool industry.
Disclosure of Invention
The invention aims to provide a preparation method of a laser welding composite brazing saw blade capable of obtaining high-speed cutting performance, aiming at solving the problems of heat dissipation and chip removal under the high-speed cutting condition.
The preparation method of the laser welding composite brazing saw blade comprises the following steps:
(1) providing a disc substrate comprising a first major surface, a second major surface, and a peripheral sidewall;
(2) forming a diamond coating on the first and second major surfaces by brazing;
(3) and a plurality of diamond tips are laser welded to the peripheral sidewall.
The diamond tool bit is characterized in that a chip removing groove is formed between every two adjacent diamond tool bits, and the diamond tool bits are of a sawtooth-shaped structure.
Wherein each of the diamond coatings has a horizontal projection shape of a cyclone shape.
Wherein the diamond coating is a plurality and is spaced apart in an annular region of the first and second major surfaces adjacent the peripheral sidewall.
Wherein the horizontal projection area of the diamond coating accounts for 3-20% of the area of the annular area, and preferably 3-15%.
Wherein the diamond tool bit is composite powder consisting of copper, iron, tin, nickel, tungsten-cobalt alloy, copper-zinc alloy, liquid paraffin and diamondThe material is prepared by cold press molding and hot press sintering, wherein the hot press sintering temperature is 690-750 ℃, and the pressure is 300-400 g/cm 2 。
Wherein, in the composite powder: 28-39 wt% of iron, 4-10 wt% of nickel, 12-23 wt% of tungsten-cobalt alloy, 5-13 wt% of tin, 1.5-2.5 wt% of copper-zinc alloy, 0.8-1.1 wt% of liquid paraffin, 1.0-2.1 wt% of diamond and the balance of copper. Preferably, in the composite powder: 30-38 wt% of iron, 5-9 wt% of nickel, 13-21 wt% of tungsten-cobalt alloy, 7-11 wt% of tin, 1.6-2.3 wt% of copper-zinc alloy, 1.0-1.2 wt% of liquid paraffin, 1.2-2.0 wt% of diamond and the balance of copper.
Wherein the content of WC in the tungsten-cobalt alloy is 80-92 wt%, and the balance is Co.
The copper-zinc alloy is preferably aluminum-iron-manganese brass, and in the aluminum-iron-manganese brass, the content of Cu is 64-68 wt%, the content of Al is 6-7 wt%, the content of Fe is 2-4 wt%, the content of Mn is 1.5-2.5 wt%, and the balance is Zn.
The diamond coating is formed by brazing a brazing powder layer consisting of copper, iron, tin, nickel, tungsten-cobalt alloy, copper-zinc alloy, liquid paraffin and diamond.
Wherein the thickness of the diamond coating is 0.10-1.0 mm, preferably 0.10-0.50 mm.
Compared with the prior art, the laser welding composite brazing saw blade prepared by the preparation method has the following beneficial effects:
the side edge of the substrate is coated with the diamond coating through a brazing process, the coating has an uneven structure, and can play a role similar to a brush in deep cutting to drain more cutting chips and sand, so that the cutting groove is kept smooth and has no chip accumulation; and the cyclone shape design ensures that the air flow is smooth, the cutting cooling efficiency is greatly reduced, the cutter head cannot be overheated and burnt to cause the passivation of a cutting surface in a high-speed cutting state, and the optimal cutting performance is favorably maintained.
Drawings
FIG. 1 is a schematic plan view of a laser welded composite brazing saw blade according to the present invention.
Fig. 2 is a schematic view of an annular region in which a brazing layer is located in a saw blade according to the invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention. The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The manufacturing process of the laser welding composite brazing saw blade of the invention comprises the following steps:
1. matrix processing
According to the requirements of drawings, quenching heat treatment, tempering, laser cutting of shape, tempering, plane grinding, inner hole grinding, outer circle grinding and deburring are carried out on the steel plate.
2. Production process of diamond tool bit
According to specific use requirements, copper, tungsten-cobalt alloy, nickel, iron, tin, copper-zinc alloy, liquid paraffin and diamond are selected and uniformly mixed, and then the diamond tool bit is manufactured through cold press molding, hot press sintering and grinding of a grinding wheel abrasive belt, wherein the hot press sintering temperature is 690-750 ℃, and the pressure is 300-400 Kg/cm 2 And the heat preservation time is 120-250 seconds.
3. And (3) sending the brazing powder layer of the steel substrate coated with the diamond according to the shape designed by the drawing into a vacuum brazing furnace to prepare the diamond coating, wherein the vacuum brazing can adopt copper-based brazing filler metal, the brazing temperature is 920-950 ℃, and warehousing after the inspection is qualified.
4. Laser welding
Putting the cutter head and the basal body together at the position of the basal body corresponding to the requirement of a drawing, adjusting the light spot of a laser welding machine to the proper position of the cutter head and the basal body, starting the laser welding machine to weld the cutter head and the basal body together at the moment of laser penetration, and then welding the cutter head and the basal body together at the speed of 600N/mm 2 The strength standard performs weld strength testing on each diamond tip.
5. Polishing, spraying paint and inspecting
The laser welding composite brazing high-performance saw blade after welding is firstly subjected to sand blasting on the inner side surface of the saw blade, then the working surface of the diamond tool bit is polished by a special grinding wheel, the diamond is exposed, the surface of the base body of the laser welding composite brazing high-performance saw blade after welding is polished to be bright by a polishing machine, and then the surface of the base body is polished by 600N/mm 2 And (3) carrying out safe welding strength detection on each diamond tool bit by using the strength standard, carrying out unqualified reworking, carrying out surface paint spraying and drying if the diamond tool bit is qualified so as to prevent the surface from rusting, and finally carrying out silk-screen printing, laser marking, packaging and warehousing.
FIGS. 1-2 illustrate a laser welded composite brazing saw blade made by the method of the present invention, comprising a disk substrate 10, said disk substrate 10 comprising a first major surface, a second major surface, and a peripheral sidewall; the peripheral side wall is provided with a plurality of diamond tips 20 by laser welding, and the first and second main surfaces are formed with diamond coatings 3 by brazing. The diameter of the disc substrate 10 may be designed to be 100mm to 500mm according to the requirement, the number of the diamond segments 20 may be varied from 12 to 30, and the number of the diamond segments is, for example, 24 in each of the following examples and comparative examples. The disc base body between the adjacent diamond tool tips 20 is provided with chip grooves adjacent to the gaps between the adjacent diamond tool tips, and the center of the disc base body 10 is provided with a mounting hole. The working surface of the diamond tool bit 20 is serrated, and the tool bit can form an interval concave-convex surface in the cutting process, so that the contact area between the tool bit and a cutting material can be reduced, the cutting impact resistance is reduced, and the diamond tool bit is liftedThe chip removal amount of the high tool bit reduces the ineffective cutting friction force and the cutting resistance, so that the saw blade can finish cutting more smoothly. The cutting machine can be used for cutting materials such as concrete pavements at a high speed, so that the construction of high-strength concrete structure pavements and wall application places is met. As an innovative design point of the invention, the diamond coatings are of a discontinuous and non-integral structure design, and each diamond coating has a horizontal projection shape like a cyclone. Each main surface in the figure is provided with 12 diamond coatings in an annular region adjacent to the peripheral side wall, and the sum of horizontal projection areas of the diamond coatings accounts for 3-20% of the area of the annular region. The diamond coating has an uneven structure, and particularly can play a role similar to a hairbrush to discharge more cutting chips, sand and stones and the like during deep cutting, so that the cutting groove is kept smooth without chip accumulation, the cyclone-shaped structure design ensures that air flow is smooth, the cutting cooling efficiency is greatly reduced, the heat dissipation performance and the cutting performance of the cutter head under the high-speed cutting condition are remarkably improved, when the area of the diamond coating in the annular area exceeds 20 percent, the raw material cost of metal powder and diamond is increased, air cooling is influenced, and therefore the diamond coating is not preferable, and when the total projected area of the diamond coating in the annular area is less than 3 percent, the chip removal and cooling effects are remarkably reduced during deep cutting, and therefore the diamond coating is not preferable. Preferably, the diamond coating has a projected total area occupying 3 to 15%, more preferably 5 to 15% of the area of the annular region, and in the following examples and comparative examples, the projected total area occupying about 10% of the area of the annular region, unless otherwise specified. In the invention, the diamond cutter head is formed by cold press molding and hot press sintering of composite powder consisting of copper, iron, tin, nickel, tungsten-cobalt alloy, copper-zinc alloy, liquid paraffin and diamond, wherein the hot press sintering temperature is 690-750 ℃, and the pressure is 300-400 g/cm 2 . In the composite powder: 28-39 wt% of iron, 4-10 wt% of nickel, 12-23 wt% of tungsten-cobalt alloy, 5-13 wt% of tin, 1.5-2.5 wt% of copper-zinc alloy, 0.8-1.1 wt% of liquid paraffin, 1.0-2.1 wt% of diamond and the balance of copper.Preferably, in the composite powder: 30-38 wt% of iron, 5-9 wt% of nickel, 13-21 wt% of tungsten-cobalt alloy, 7-11 wt% of tin, 1.6-2.3 wt% of copper-zinc alloy, 1.0-1.2 wt% of liquid paraffin, 1.2-2.0 wt% of diamond and the balance of copper. The tungsten-cobalt alloy contains 80-92 wt% of WC, and the balance of Co (in the following examples and comparative examples, the WC content is 92 wt%, and the Co content is 8 wt%). The copper-zinc alloy can adopt brass with 10-38 wt% of zinc, and is not particularly limited in the invention. The composite powder has both cutting performance and heat dissipation performance, the tungsten-cobalt alloy is added to facilitate high-speed cutting of a high-strength concrete structure, the tungsten-cobalt alloy has certain brittleness, the wear loss is large due to the adoption of conventional metal powder compounding, the service life of the tungsten-cobalt alloy is influenced, and the small amount of copper-zinc alloy is added to the composite powder to facilitate improvement of hot-pressing sintering performance, improvement of integral toughness and reduction of wear loss. More preferably, the selection of an aluminum-iron-manganese brass is more conducive to reducing wear consumption during cutting. Specifically, in the aluminum-iron-manganese brass, the content of Cu is 64-68 wt%, the content of Al is 6-7 wt%, the content of Fe is 2-4 wt%, the content of Mn is 1.5-2.5 wt%, and the balance is Zn. In the invention, the diamond coating is formed by brazing the brazing powder layer consisting of copper, iron, tin, nickel, tungsten-cobalt alloy, copper-zinc alloy, liquid paraffin and diamond. The components of the diamond coating are basically the same as those of the composite powder adopted by the diamond tool bit except that liquid paraffin serving as a pore-foaming agent is not added. Specifically, the content of iron in the brazing powder layer is 28-39 wt%, the content of nickel is 4-10 wt%, the content of tungsten-cobalt alloy is 12-23 wt%, the content of tin is 5-13 wt%, the content of copper-zinc alloy is 1.5-2.5 wt%, the content of diamond is 1.0-2.1 wt%, and the balance is copper. Preferably, in the composite powder: 30-38 wt% of iron, 5-9 wt% of nickel, 13-21 wt% of tungsten-cobalt alloy, 7-11 wt% of tin, 1.6-2.3 wt% of copper-zinc alloy, 1.2-2.0 wt% of diamond and the balance of copper. The tungsten-cobalt alloy contains 80-92 wt% of WC, and the balance of Co (in the following examples and comparative examples, the WC content is 92 wt%, and the Co content is 8 wt%). The copper-zinc alloy can adopt brass with 10-38 wt% of zincAnd is not particularly limited in the present invention. The diamond coating is formed on the disc substrate by brazing and has a thickness of 0.10 to 1.0mm, preferably 0.10 to 0.50mm, and in the examples and comparative examples of the present invention, the thickness is 0.50mm unless otherwise specified.
Example 1
28.7 parts by weight of copper powder, 28 parts by weight of iron powder, 10 parts by weight of nickel powder, 23 parts by weight of tungsten-cobalt alloy, 5 parts by weight of tin and 2.5 parts by weight of copper-zinc alloy are put into a mixing barrel and mixed for 1 hour, 1 part by weight of liquid paraffin and 1.8 parts by weight of diamond are added, and the mixture is continuously mixed for 3 hours to obtain the composite powder for forming the diamond tool bit in the embodiment.
And (3) putting 29.7 parts by weight of copper powder, 28 parts by weight of iron powder, 10 parts by weight of nickel powder, 23 parts by weight of tungsten-cobalt alloy, 5 parts by weight of tin and 2.5 parts by weight of copper-zinc alloy into a mixing barrel, mixing for 1 hour, adding 1.8 parts by weight of diamond, and continuously mixing for 2 hours to obtain the brazing filler metal powder for the diamond coating in the embodiment.
In this example, the copper-zinc alloy is brass having a zinc content of 22 wt% and a copper content of 78 wt%.
Filling the obtained composite powder into a die for cold press molding, and hot press sintering at 720 ℃ under 380Kg/cm 2 And keeping the temperature for 200 seconds, and then grinding the tool bit by using a grinding wheel abrasive belt for later use.
Coating the prepared brazing filler metal powder on the surface of a disc substrate to prepare a cyclone brazing powder layer as shown in the figure, then sending the brazing powder layer into a vacuum brazing furnace, vacuumizing and preserving heat at 920 ℃ for 20 minutes to prepare the diamond coating.
Adjusting the light spot of the laser welding machine to the proper position of the cutter head and the base body, starting the laser welding machine to weld the cutter head and the base body together at the moment of laser penetration, and then welding the cutter head and the base body at the speed of 600N/mm 2 The method comprises the steps of detecting the welding strength of each diamond tool bit according to the strength standard, then welding and protecting teeth by adopting high-frequency welding, polishing the surface of a substrate by using a polishing machine for laser welding and composite brazing high-performance saw blades after welding to be bright, polishing the working surface of each diamond tool bit by using a special grinding wheel to expose diamonds, and then spraying paint on the surface of the working surface to enable the diamonds to be exposedAnd drying to prevent the surface from rusting, finally detecting the welding strength of each diamond cutter head according to the strength standard of 600N/mm2, performing unqualified rework, performing surface painting if qualified, drying to prevent the surface from rusting, and finally performing silk-screen printing, laser marking, packaging and warehousing.
Example 2
27.7 parts by weight of copper powder, 39 parts by weight of iron powder, 4 parts by weight of nickel powder, 12 parts by weight of tungsten-cobalt alloy, 13 parts by weight of tin and 1.5 parts by weight of copper-zinc alloy are put into a mixing barrel and mixed for 1 hour, 1 part by weight of liquid paraffin and 1.8 parts by weight of diamond are added, and the mixture is continuously mixed for 3 hours to obtain the composite powder for forming the diamond tool bit in the embodiment.
28.7 parts by weight of copper powder, 39 parts by weight of iron powder, 4 parts by weight of nickel powder, 12 parts by weight of tungsten-cobalt alloy, 13 parts by weight of tin and 1.5 parts by weight of copper-zinc alloy are put into a mixing barrel and mixed for 1 hour, 1.8 parts by weight of diamond is added, and the mixture is continuously mixed for 2 hours to obtain the brazing filler metal powder for the diamond coating in the embodiment.
In this example, the copper-zinc alloy is brass having a zinc content of 22 wt% and a copper content of 78 wt%.
Filling the obtained composite powder into a die for cold press molding, and hot press sintering at 720 ℃ under the pressure of 350Kg/cm 2 And keeping the temperature for 200 seconds, and then grinding the tool bit by using a grinding wheel abrasive belt for later use.
Coating the prepared brazing filler metal powder on the surface of a disc substrate to prepare a cyclone brazing powder layer as shown in the figure, then sending the brazing powder layer into a vacuum brazing furnace, vacuumizing and preserving heat at 920 ℃ for 20 minutes to prepare the diamond coating.
Adjusting the light spot of a laser welding machine to a proper position of the cutter head and the base body, starting the laser welding machine to weld the cutter head and the base body together at the moment of laser penetration, and then welding at the speed of 600N/mm 2 The welding strength of each diamond tool bit is detected according to the strength standard, high-frequency welding tooth protection is adopted, after welding, the surface of a base body is polished by a polishing machine for laser welding composite brazing high-performance saw blades to be bright, then the working surface of each diamond tool bit is polished by a special grinding wheel to expose the diamond, and then the surface is displayedSpraying paint on the surface, drying to prevent the surface from rusting, finally detecting the welding strength of each diamond cutter head according to the strength standard of 600N/mm2, performing unqualified rework, spraying paint on the surface if qualified, drying to prevent the surface from rusting, finally performing silk-screen printing, laser marking, packaging and warehousing.
Example 3
The difference from example 1 is that the copper-zinc alloy used was an aluminum-iron-manganese brass having a Cu content of 65 wt%, an Al content of 6 wt%, an Fe content of 4 wt%, an Mn content of 2.1 wt%, and the balance Zn.
Example 4
The difference from example 2 is that the copper-zinc alloy used was an aluminum-iron-manganese brass having a Cu content of 65 wt%, an Al content of 6 wt%, an Fe content of 4 wt%, an Mn content of 2.1 wt%, and the balance Zn.
Comparative example 1
The difference from example 1 is that the diamond coating was not brazed.
Comparative example 2
The difference from example 2 is that an integral continuous diamond coating was applied throughout the annular region.
Comparative example 3
The difference from the example 1 is that copper-zinc alloy is not used, and the composition of the composite powder for forming the diamond tool bit is as follows: 31.2 parts of copper powder, 28 parts of iron powder, 10 parts of nickel powder, 23 parts of tungsten-cobalt alloy, 5 parts of tin, 1 part of liquid paraffin and 1.8 parts of diamond.
Comparative example 4
The difference from the example 2 is that copper-zinc alloy is not adopted, and the composition of the composite powder for forming the diamond tool bit is as follows: 29.2 parts of copper powder, 39 parts of iron powder, 4 parts of nickel powder, 12 parts of tungsten-cobalt alloy, 13 parts of tin, 1 part of liquid paraffin and 1.8 parts of diamond.
The cutting experiments were performed using the circular saw blades prepared in examples 1 to 4 and comparative examples 1 to 4, concrete (compressive strength of 60MPa) was cut (cutting depth of 100mm) using a cutter having an output of 10.0kW and a constant pressure, the total cutting length of each diamond saw blade was 100m, and the average cutting speed and the wear properties of the diamond segments were measured, and the results are shown in table 1.
TABLE 1
Figure BDA0003660013730000071
It is obvious to those skilled in the art that the present invention is not limited to the above embodiments, and various insubstantial modifications of the method concept and the technical solution of the present invention are within the scope of the present invention.

Claims (10)

1. The preparation method of the laser welding composite brazing saw blade is characterized by comprising the following steps of:
(1) providing a disc substrate comprising a first major surface, a second major surface, and a peripheral sidewall;
(2) forming a diamond coating on the first and second major surfaces by brazing;
(3) and a plurality of diamond tips are laser welded to the peripheral sidewall.
2. The method of claim 1, wherein: chip grooves are arranged between adjacent diamond tool bits, and the diamond tool bits are of a sawtooth-shaped structure.
3. The method of claim 1, wherein: each of the diamond coatings has a horizontal projection shape of a cyclone shape.
4. The method of claim 1, wherein: the diamond coating is in plurality and is spaced apart in an annular region of the first and second major surfaces adjacent the peripheral sidewall.
5. The method of claim 4, wherein: the horizontal projection area of the diamond coating accounts for 3-20% of the area of the annular area.
6. The method of claim 1, wherein: the diamond cutter head is formed by cold press molding and hot press sintering of composite powder consisting of copper, iron, tin, nickel, tungsten-cobalt alloy, copper-zinc alloy, liquid paraffin and diamond, wherein the hot press sintering temperature is 690-750 ℃, and the pressure is 300-400 g/cm 2 。
7. The method of claim 6, wherein: 28-39 wt% of iron, 4-10 wt% of nickel, 12-23 wt% of tungsten-cobalt alloy, 5-13 wt% of tin, 1.5-2.5 wt% of copper-zinc alloy, 0.8-1.1 wt% of liquid paraffin, 1.0-2.1 wt% of diamond and the balance of copper.
8. The method of claim 7, wherein: the tungsten-cobalt alloy contains 80-92 wt% of WC and the balance of Co.
9. The method of claim 8, wherein: the copper-zinc alloy is preferably aluminum-iron-manganese brass, and in the aluminum-iron-manganese brass, the content of Cu is 64-68 wt%, the content of Al is 6-7 wt%, the content of Fe is 2-4 wt%, the content of Mn is 1.5-2.5 wt%, and the balance is Zn.
10. The production method according to claim 1, characterized in that: the diamond coating is formed by brazing a brazing powder layer consisting of copper, iron, tin, nickel, tungsten-cobalt alloy, copper-zinc alloy, liquid paraffin and diamond.
CN202210574128.3A 2022-05-24 2022-05-24 Preparation method of laser welding composite brazing saw blade Pending CN114918487A (en)

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