Diamond saw blade tool bit and preparation method thereof

Abstract

The invention provides a diamond saw blade tool bit and a preparation method thereof, and belongs to the technical field of diamond saw blades. The diamond saw blade tool bit is prepared from, by mass, 28%-45% of iron, 23%-35% of copper, 8%-16% of nickel, 10%-22% of cobalt, 3%-9% of tin, 0.2%-1.0% of hollow ceramic balls and 2.0%-4.0% of diamond. The invention further provides a diamond saw blade comprising the diamond tool bit and a base material. By adding the hollow ceramic balls, the effects of weakening the abrasiveness of the matrix, increasing the porosity of the diamond tool bit, facilitating rapid exposure of the diamond and increasing the slotting and polishing speed can be achieved in the diamond matrix. The diamond saw blade provided by the invention is suitable for processing non-metal brittle and hard materials such as expressways, airport runways, bridge engineering, stone processing and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of diamond saw blades, and particularly to a diamond saw blade tip and a preparation method thereof. Background Art

[0002] As an efficient cutting tool, diamond saw blades are widely used in the cutting and processing fields of hard materials such as stone, ceramics, and concrete. Their performance directly affects the cutting efficiency, cutting quality, and service life of the tool. As the key part of the saw blade, the raw material composition and ratio of the saw blade tip play a decisive role in the performance of the tip.

[0003] Traditional diamond saw blade tips are usually made by mixing and sintering metal powders (such as copper, iron, nickel, etc.) and diamond particles. Although such tips can meet the cutting requirements to a certain extent, there are still some deficiencies. For example, the compressive strength and wear resistance of the tip need to be improved to cope with the cutting of harder materials; the toughness of the tip is insufficient, and it is easy to crack during the cutting process; in addition, the heat dissipation performance of the tip also affects its service life and cutting effect.

[0004] In practical applications, when cutting hard materials, the saw blade tip needs to withstand huge pressure and friction. Therefore, it is urgent to improve the compressive strength and wear resistance of the tip. At the same time, to ensure the stability of the tip during the cutting process, it is also necessary to improve its toughness to prevent cracking. In addition, good heat dissipation performance is also one of the key factors for extending the service life of the tip.

[0005] In summary, the existing diamond saw blade tips on the market still have deficiencies in aspects such as compressive strength, wear resistance, toughness, and heat dissipation performance, and cannot fully meet the requirements of efficient and stable cutting of hard materials. Therefore, developing a diamond saw blade tip with better performance has important practical significance and broad application prospects. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a diamond saw blade tip and a preparation method thereof.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] One technical solution of the present invention, a diamond saw blade tip, by mass percentage, the raw materials include the following components: 28 - 45% of iron, 23 - 35% of copper, 8 - 16% of nickel, 10 - 22% of cobalt, 3 - 9% of tin, 0.2 - 1.0% of hollow ceramic balls, and 2.0 - 4.0% of diamond.

[0009] In a preferred embodiment of the present invention, by mass percentage, the raw materials include the following components: 37-45% of iron, 24-28% of copper, 10-15% of nickel, 12-20% of cobalt, 4-9% of tin, 0.3-0.8% of hollow ceramic balls, and 2.5-3.8% of diamond.

[0010] In a preferred embodiment of the present invention, by mass percentage, the raw materials include the following components: 45% of iron, 24% of copper, 10% of nickel, 12% of cobalt, 8% of tin, 0.5% of hollow ceramic balls, and 3.5% of diamond.

[0011] In a preferred embodiment of the present invention, the mesh number of the hollow ceramic balls is 50-60 mesh.

[0012] In a preferred embodiment of the present invention, the mesh number of the diamond is 30-40 mesh or 40-45 mesh, and the compressive strength is 35-60 KG.

[0013] The present invention also includes arranging a plurality of grooves on the surface of the diamond cutting head. According to the disadvantages that it is not easy to discharge chips during the working and grinding of conventional grooving slices and the need for water cooling, etc., through the groove design of the present invention, during high-speed grinding, chips can be discharged through the grooves at the top of the cutting head. At the same time, due to the groove design, the cutting effect of the diamond on the cutting head is increased; the heat dissipation area of the cutting head is also increased.

[0014] The second technical solution of the present invention is a preparation method of the above-mentioned diamond saw blade cutting head, including the following steps:

[0015] After mixing iron powder, copper powder, nickel powder, cobalt powder, and tin powder evenly, a mixture 1 is obtained;

[0016] Add hollow ceramic balls and diamond to the mixture 1 and mix evenly to obtain a mixture 2;

[0017] Cold-press and form the mixture 2, and then hot-press and sinter it to obtain the diamond saw blade cutting head.

[0018] In a preferred embodiment of the present invention, the pressure during cold-press forming is 8.5-14 tons; the temperature of hot-press sintering is 760-840 °C, the time is 3-5 min, and the pressure is 200-350 kg / cm 2 . The present invention does not make special limitations on the particle sizes of iron powder, copper powder, nickel powder, cobalt powder, and tin powder, and the conventional selections of those skilled in the art can be used, such as 200-300 mesh.

[0019] The third technical solution of the present invention is a diamond saw blade, including a matrix material and the above-mentioned diamond saw blade cutting head.

[0020] The present invention also includes a hollow design for the substrate, which serves three purposes: first, it reduces the weight of the saw blade itself; second, it increases heat dissipation during high-speed rotation; third, it reduces the yaw of the saw blade substrate while increasing the bending strength of the saw blade substrate.

[0021] The present invention discloses the following technical effects:

[0022] By adding hollow ceramic balls, the present invention can weaken the abrasiveness of the matrix in the diamond matrix, increase the porosity of the diamond cutting head, facilitate the rapid exposure of diamonds, and improve the grooving and grinding speed.

[0023] The diamond saw blade provided by the present invention is applicable to highway construction, airport runway construction, bridge engineering, stone processing, and processing of non-metallic brittle and hard materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 It is an electron microscope analysis diagram after mixing metal powder, hollow ceramic balls and diamonds in Example 1;

[0026] Figure 2 In (a), (b), and (c) are electron microscope analysis diagrams of different points on the same cross-section of the cutting head obtained in Example 1;

[0027] Figure 3 It is a schematic diagram of the diamond saw blade of the present invention, where 1 is the diamond cutting head (each cutting head has three grooves), 2 is the substrate, 3 is the laser cutting hole, D is the center hole of the saw blade, H is the width of the diamond cutting head, which is 8 - 25 mm, and L is the length of the diamond cutting head. DETAILED DESCRIPTION OF THE INVENTION

[0028] Now, various exemplary embodiments of the present invention will be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, characteristics, and implementation schemes of the present invention.

[0029] It should be understood that the terms described in the present invention are only for describing specific implementation manners and are not used to limit the present invention. Additionally, for the numerical ranges in the present invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Any intermediate value within any stated value or stated range, as well as each smaller range between any other stated value or intermediate value within the stated range, is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded from the range.

[0030] Unless otherwise specified, 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 pertains. Although this invention only describes preferred methods and materials, any methods and materials similar or equivalent to those described herein can also be used in the practice or testing of this invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In case of conflict with any incorporated document, the content of this specification shall prevail.

[0031] Without departing from the scope or spirit of this invention, various improvements and changes can be made to the specific embodiments of the specification of this invention, which are obvious to those skilled in the art. Other embodiments obtained from the specification of this invention are obvious to those skilled in the art. The specification and examples of this invention are merely exemplary.

[0032] Regarding the use of "comprising", "including", "having", "containing", etc. herein, they are all open-ended terms, meaning including but not limited to.

[0033] The preparation method of the diamond saw blade tip provided by this invention is as follows:

[0034] Weigh materials according to the proportion of 28 - 45 wt% of iron, 23 - 35 wt% of copper, 8 - 16 wt% of nickel, 10 - 22 wt% of cobalt, 3 - 9 wt% of tin, 0.2 - 1.0 wt% of hollow ceramic balls and 2.0 - 4.0 wt% of diamond in the diamond saw blade tip. After mixing iron powder, copper powder, nickel powder, cobalt powder and tin powder evenly, we get mixture 1;

[0035] Add hollow ceramic balls and diamond to the mixture 1 and mix evenly to get mixture 2;

[0036] Cold press and form the mixture 2, and then hot press and sinter it to obtain the diamond saw blade tip;

[0037] Among them, the pressure during cold pressing and forming is 8.5 - 14 tons; the temperature of hot pressing and sintering is 760 - 840 °C, the time is 3 - 5 min, and the pressure is 200 - 350 kg / cm 2 .

[0038] This invention also provides a diamond saw blade, which includes a base material and the above-mentioned diamond saw blade tip. The preparation method is as follows:

[0039] 1. Substrate processing

[0040] Cut the required substrate according to the drawing requirements.

[0041] 2. High-frequency welding

[0042] Place the above-mentioned cutting head and the solder tab at the corresponding position on the substrate according to the requirements of the drawing. Adjust the welding position and heat to melt the solder tab to weld the cutting head and the substrate together. Then, perform a welding strength test on each diamond cutting head according to the strength standard of 600 N / mm 2 strength standard.

[0043] 3. Grinding, painting, and inspection

[0044] First, use a grinding wheel to grind the working surface of the diamond cutting head to expose the diamond. Then, use a grinder and a sanding belt to remove the oxide scale on the surface of the substrate caused by welding for the welded diamond saw blade. Then, perform surface painting and drying to prevent surface rust. Finally, perform a welding strength test on each diamond cutting head according to the strength standard of 600 N / mm 2 strength standard. After passing the test, print, package, and store in the warehouse.

[0045] For the technical solutions described in the present invention, unless otherwise specified, they are all conventional solutions in the art. The reagents or raw materials used, unless otherwise specified, are all purchased from commercial channels or are publicly available.

[0046] In the embodiment, the mesh number of the diamond is 30 - 40 mesh, and the compressive strength is 35 - 60 KG; the mesh number of the hollow ceramic balls is 50 - 60 mesh.

[0047] To better understand the present invention, the content of the present invention will be further clarified below in conjunction with embodiments. However, the content of the present invention is not limited to the following embodiments.

[0048] Example 1

[0049] Weigh iron powder, copper powder, nickel powder, cobalt powder, tin powder, hollow ceramic balls, and diamond according to the ratio of iron 36 wt%, copper 32 wt%, nickel 10 wt%, cobalt 15 wt%, tin 3 wt%, hollow ceramic balls 0.5 wt%, and diamond 3.5%. Put the iron powder, copper powder, nickel powder, cobalt powder, and tin powder into the mixing barrel and mix for 30 minutes. Then, add the hollow ceramic balls and diamond and continue to mix for 2 hours. After that, pour the powder into the mold and perform cold pressing (pressure: 10.5 tons), and then perform hot pressing and sintering (temperature: 825 °C, time: 5 min, pressure: 350 kg / cm 2 ) to obtain the cutting head. The size of the cutting head is 40 mm × 15 mm × 10 mm, and 3 grooves are provided at the top of the cutting head.

[0050] Use a grinding wheel and a sanding belt to grind the cutting head. Place the cutting head and the silver solder tab at the corresponding position on the substrate according to the requirements of the drawing. Adjust the welding position and heat to melt the silver solder tab to weld the cutting head and the substrate together. Then, perform a welding strength test on each diamond cutting head according to the strength standard of 600 N / mm 2The strength standard is used to detect the welding strength of each diamond bit. First, the working surface of the diamond bit is polished with a special grinding wheel to expose the diamond. Then, the welded diamond saw blade is polished with a grinder and abrasive belt to remove the oxide scale on the matrix surface caused by welding. Then, surface painting and drying are carried out to prevent surface rust. Finally, with 600N / mm 2 The strength standard is used to detect the welding strength of each diamond bit. After passing the test, it is printed, packaged and stored in the warehouse.

[0051] The obtained bits in this embodiment are analyzed by electron microscopy. As Figure 2 shown, it can be seen that the matrix has a very high holding force for the diamond, the diamond protrudes significantly, the matrix is fully alloyed, and the hollow ceramic balls are evenly distributed.

[0052] Example 2

[0053] The difference from Example 1 is only that the ingredients are proportioned according to the ratio of iron 37wt%, copper 28wt%, nickel 10wt%, cobalt 16wt%, tin 5wt%, hollow ceramic balls 0.5wt% and diamond 3.5%. Other steps and parameters are the same as those in Example 1.

[0054] Example 3

[0055] The difference from Example 1 is only that the ingredients are proportioned according to the ratio of iron 45wt%, copper 24wt%, nickel 10wt%, cobalt 12wt%, tin 8wt%, hollow ceramic balls 0.5wt% and diamond 3.5%. Other steps and parameters are the same as those in Example 1.

[0056] Comparative Example 1

[0057] The difference from Example 1 is only that the ingredients are proportioned according to the ratio of iron 36wt%, copper 32wt%, nickel 10wt%, cobalt 15wt%, tin 3wt% and diamond 4.0%. Other steps and parameters are the same as those in Example 1 (that is, compared with Example 1, the addition of hollow ceramic balls is omitted).

[0058] Comparative Example 2

[0059] The difference from Example 1 is only that the ingredients are proportioned according to the ratio of iron 37wt%, copper 28wt%, nickel 10wt%, cobalt t 16wt%, tin 5wt%, solid ceramic balls 0.5wt% and diamond 3.5%. Other steps and parameters are the same as those in Example 1.

[0060] Comparative Example 3

[0061] The difference from Example 1 is only that the hollow ceramic balls are replaced with graphite particles. Other steps and parameters are the same as those in Example 1.

[0062] For the hardness test, refer to the standard GB / T 230.1-2009. For the detection of the bending strength of welding, refer to the first part of the standard GB / T 11270 "Superabrasive Products - Diamond Circular Saws". The circular saw blades prepared by Examples 1 to 3 and Comparative Examples 1 to 3 were used for cutting and grinding experiments. A cutting machine with an output power of 15.0 kW was used to cut concrete (with a compressive strength of 55 MPa) under constant pressure (the cutting and grinding depth was 20 mm). The total cutting length of each diamond saw blade was 100 m, and the average cutting speed and the wear performance of the diamond cutting head were tested.

[0063] The performance of the cutting heads obtained from the examples and comparative examples was measured, and the results are shown in Table 1.

[0064] Table 1

[0065]

[0066]

[0067] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A diamond saw blade segment, characterized in that, By mass percentage, the raw materials include the following components: iron 28 - 45%, copper 23 - 35%, nickel 8 - 16%, cobalt 10 - 22%, tin 3 - 9%, hollow ceramic balls 0.2 - 1.0%, and diamond 2.0 - 4.0%.

2. The diamond saw blade segment according to claim 1, characterized in that, By mass percentage, the raw materials include the following components: iron 37 - 45%, copper 24 - 28%, nickel 10 - 15%, cobalt 12 - 20%, tin 4 - 9%, hollow ceramic balls 0.3 - 0.8%, and diamond 2.5 - 3.8%.

3. The diamond saw blade segment according to claim 1, wherein By mass percentage, the raw materials include the following components: iron 45%, copper 24%, nickel 10%, cobalt 12%, tin 8%, hollow ceramic balls 0.5%, and diamond 3.5%.

4. The diamond saw blade segment according to claim 1, wherein, The mesh number of the hollow ceramic balls is 50 - 60 mesh.

5. The diamond saw blade segment according to claim 1, wherein The mesh number of the diamond is 30 - 40 mesh or 40 - 45 mesh, and the compressive strength is 35 - 60 KG.

6. A method for preparing the diamond saw blade segment according to any one of claims 1-5, characterized in that, It includes the following steps: After mixing iron powder, copper powder, nickel powder, cobalt powder, and tin powder evenly, mixture 1 is obtained; Adding hollow ceramic balls and diamond into the mixture 1 and mixing evenly to obtain mixture 2; Cold - pressing and shaping the mixture 2, and then hot - pressing and sintering to obtain the diamond saw blade tip.

7. The preparation method according to claim 6, characterized in that, The pressure during cold pressing is 8.5 - 14 tons; the temperature of hot press sintering is 760 - 840 °C, the time is 3 - 5 min, and the pressure is 200 - 350 kg / cm 2 .

8. A diamond saw blade, characterized in that, It includes a matrix material and the diamond saw blade tip described in Claim 1.

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