A low-temperature sintered sharp type granite saw blade and a method for manufacturing the same

Abstract

The present application relates to the technical field of stone cutting, in particular to a low-temperature sintered sharp granite saw blade, wherein the saw blade head is sintered by mixing metal powder with diamond and phosphate compound at 650-750 DEG C. The present application activates the sintering process by adding phosphate compound, greatly reduces the sintering temperature, and further protects the diamond and improves the density of the head. In addition, the present application can further hold molten metal by means of the glass phase generated by melting of the phosphate compound, thereby reducing the weight loss rate of the saw blade head.

Description

Technical Field

[0001] The invention relates to the technical field of stone cutting, in particular to a low-temperature sintered sharp granite saw blade and a preparation method thereof. Background Art

[0002] Diamond tools are the most common method for processing granite, with granite saw blades primarily used for cutting granite. Saw blades typically consist of a base, primarily made of stainless steel, and a segmented metal impregnated with diamonds. The composition and structure of the segment directly influence the cutting performance of the saw blade. The sharper the saw blade, the better the stone cutting results, reducing post-processing costs and energy consumption.

[0003] Currently, to achieve this goal, common sharp granite saw blades and segments are generally sintered at high temperatures (above 800°C). However, at high temperatures, diamond performance will irreversibly decline, and the segment weight loss rate is relatively high. Therefore, the present invention proposes a low-temperature sintered sharp granite saw blade and its manufacturing method to address the above problems. Summary of the Invention

[0004] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the structures particularly pointed out in the description and other drawings.

[0005] The present invention aims to overcome the aforementioned shortcomings by providing a low-temperature sintered, sharp granite saw blade and its preparation method. By adding a phosphate compound, the present invention activates the sintering process, significantly reducing the sintering temperature, thereby protecting the diamond and further improving the density of the blade segment. Furthermore, the present invention utilizes the glass phase produced by the melting of the phosphate compound to further hold the molten metal, thereby reducing the weight loss of the saw blade segment.

[0006] The invention provides a low-temperature sintered sharp granite saw blade. The saw blade head is sintered at 650-750°C by mixing metal powder with diamond and phosphate compound.

[0007] The present invention activates the sintering process by adding phosphate compounds, greatly reduces the sintering temperature, thereby protecting the diamond and greatly improving the density of the saw blade segment.

[0008] In some embodiments, the metal powder includes a first metal powder and a second metal powder, the first metal powder is Fe-Cu-Sn alloy powder, and the second metal powder is a combination of one or more of Cu-Zn, Fe, Cu, Sn, and Zn powders.

[0009] In some embodiments, the metal powder includes Fe, Cu, Sn, and Zn elements. Based on the total mass of the metal powder, the mass content of the Fe element is 20% to 50%, the mass content of the Cu element is 15% to 35%, the mass content of the Sn element is 5% to 20%, and the mass content of the Zn element is 10% to 30%.

[0010] In some embodiments, the diamond particle size in the metal powder is 270 μm to 425 μm. The present invention optimizes the sharpness and cutting edge quality of the tool head by reasonably controlling the diamond particle size.

[0011] In some embodiments, the mass content of the phosphate compound in the metal powder is 0.5% to 3% of the mass content of the metal powder. By rationally controlling the amount of the phosphate compound added, the present invention can ensure maximum activation during the sintering process, thereby reducing the sintering temperature, thereby protecting the diamond and further improving the density of the saw blade segment.

[0012] In some embodiments, the phosphate compound in the metal powder is P2O5.

[0013] In some embodiments, the phosphate compound in the metal powder is a P2O5-based doping compound.

[0014] In some embodiments, the mass content of diamond in the metal powder is 10% to 30% of the mass content of the metal powder.

[0015] The present invention also provides a method for preparing a low-temperature sintered sharp granite saw blade, comprising the following steps:

[0016] Mixing: adding a wetting agent to the metal powder, stirring thoroughly, then adding diamond and phosphate compound and continuing to stir until thoroughly mixed to obtain a mixed powder;

[0017] Hot pressing and sintering: pressing the mixed powder into a blank, placing it in a mold and hot pressing and sintering it to obtain a tool head;

[0018] Grinding and brazing: grinding and brazing the cutter head onto a stainless steel substrate to obtain a saw blade;

[0019] The sintering temperature is 650°C to 750°C.

[0020] In some embodiments, during the hot pressing sintering, the pressure is 80 KN to 120 KN, and the time is 1 min to 3 min.

[0021] By adopting the above technical solution, the beneficial effects of the present invention are:

[0022] The present invention activates the sintering process by adding a phosphate compound, greatly reduces the sintering temperature, thereby protecting the diamond and further improving the density of the tool head.

[0023] The present invention can further hold the molten metal by means of the glass phase generated by melting the phosphate compound, thereby reducing the weight loss rate of the saw blade head.

[0024] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0025] Undoubtedly, these and other objects of the present invention will become more apparent after the following detailed description of the preferred embodiment is described with reference to the various drawings and figures.

[0026] In order to make the above and other objects, features and advantages of the present invention more obvious and easy to understand, one or more preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention but do not constitute a limitation of the present invention.

[0028] In the drawings, like components are given like reference numerals, and the drawings are schematic and not necessarily drawn to scale.

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only one or several embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on such drawings without paying any creative work.

[0030] Figure 1 This is a schematic diagram of the preparation process of a low-temperature sintered sharp granite saw blade according to the present invention;

[0031] Figure 2 This is a comparison curve of the current consumed by the granite saw blades of Example 1 of the present invention and Comparative Example 1 when cutting stone;

[0032] Figure 3 This is a comparison curve of the lifespan of the granite saw blades of Example 1 of the present invention and Comparative Example 1;

[0033] Figure 4 Schematic diagram of sintering of granite saw blade segments according to Example 1 of the present invention and Comparative Example 1. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but are not intended to limit the present invention.

[0035] In addition, in the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] In the present invention, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connections, removable connections, or integration; they may refer to direct connections or indirect connections through an intermediate medium; they may refer to internal communication between two components or interactions between two components. However, the term "direct connection" indicates that the two connected entities are not connected through a transitional structure, but are connected solely through a connecting structure to form a single entity. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0038] According to some embodiments of the present invention, a low-temperature sintered sharp granite saw blade is provided, wherein the saw blade segment is formed by sintering metal powder mixed with diamond and phosphate compound at 650°C to 750°C.

[0039] The present invention activates the sintering process by adding phosphate compounds, greatly reduces the sintering temperature, thereby protecting the diamond and greatly improving the density of the saw blade segment.

[0040] According to some embodiments of the present invention, optionally, the metal powder includes a first metal powder and a second metal powder, the first metal powder is Fe-Cu-Sn alloy powder, and the second metal powder is a combination of one or more of Cu-Zn, Fe, Cu, Sn, and Zn powders.

[0041] According to some embodiments of the present invention, optionally, the metal powder includes Fe element, Cu element, Sn element, and Zn element. Based on the total mass of the metal powder, the mass content of the Fe element is 20% to 50%, the mass content of the Cu element is 15% to 35%, the mass content of the Sn element is 5% to 20%, and the mass content of the Zn element is 10% to 30%.

[0042] Optionally, the mass content of the Fe element is 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, or its value is within the range obtained by combining any two of the above values.

[0043] Optionally, the mass content of the Cu element is 15%, 17%, 19%, 21%, 23%, 25%, 27%, 29%, 31%, 33%, 35%, or its value is within the range obtained by combining any two of the above values.

[0044] Optionally, the mass content of the Sn element is 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, or its value is within the range obtained by combining any two of the above values.

[0045] Optionally, the mass content of the Zn element is 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, or its value is within the range obtained by combining any two of the above values.

[0046] According to some embodiments of the present invention, the diamond particle size in the metal powder is optionally 270 μm to 425 μm. The present invention reasonably controls the diamond particle size so that the diamond can be fully combined with the metal powder, making the structure of the saw blade segment more stable.

[0047] Optionally, the diamond particle size in the metal powder is 270μm, 280μm, 290μm, 300μm, 310μm, 320μm, 330μm, 340μm, 350μm, 360μm, 370μm, 380μm, 390μm, 400μm, 410μm, 420μm, 425μm, or its value is within the range obtained by combining any two of the above values.

[0048] According to some embodiments of the present invention, the phosphate compound in the metal powder optionally contains 0.5% to 3% of the metal powder by mass. By properly controlling the amount of phosphate compound added, the present invention can ensure maximum activation during the sintering process, thereby reducing the sintering temperature, thereby protecting the diamond and further improving the density of the saw blade segment.

[0049] Optionally, the mass content of the phosphate compound in the metal powder is 0.5%, 1.0%, 1.5%, 2.0%, 2.5%, or 3% of the mass content of the metal powder, or its value is within the range obtained by combining any two of the above values.

[0050] According to some embodiments of the present invention, optionally, the phosphate compound in the metal powder is P2O5.

[0051] According to some embodiments of the present invention, optionally, the phosphate compound in the metal powder is a doping compound based on P2O5.

[0052] According to some embodiments of the present invention, optionally, the mass content of diamond in the metal powder is 10% to 30% of the mass content of the metal powder.

[0053] Optionally, the mass content of diamond in the metal powder is 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, or 30% of the mass content of the metal powder, or its value is within the range obtained by combining any two of the above values.

[0054] Reference Figure 1 , Figure 1 The figure is a schematic diagram of the preparation process of a low-temperature sintered sharp granite saw blade according to the present invention.

[0055] According to some embodiments of the present invention, the present invention further provides a method for preparing a low-temperature sintered sharp granite saw blade, comprising the following steps:

[0056] Mixing: adding a wetting agent to the metal powder, stirring thoroughly, then adding diamond and phosphate compound and continuing to stir until thoroughly mixed to obtain a mixed powder;

[0057] Hot pressing and sintering: pressing the mixed powder into a blank, placing it in a mold and hot pressing and sintering it to obtain a tool head;

[0058] Grinding and brazing: grinding and brazing the cutter head onto a stainless steel substrate to obtain a saw blade;

[0059] The sintering temperature is 650°C to 750°C.

[0060] Optionally, the sintering temperature is 650°C, 660°C, 670°C, 680°C, 690°C, 700°C, 710°C, 720°C, 730°C, 740°C, 750°C, or its value is within the range obtained by combining any two of the above values.

[0061] According to some embodiments of the present invention, optionally, during the hot pressing sintering, the pressure is 80 KN to 120 KN, and the time is 1 min to 3 min.

[0062] Optionally, during the hot pressing sintering, the pressure is 80 KN, 85 KN, 90 KN, 95 KN, 100 KN, 105 KN, 110 KN, 115 KN, 120 KN, or a value within the range obtained by combining any two of the above values.

[0063] Optionally, in the hot pressing sintering, the time is 1 min, 1.2 min, 1.4 min, 1.6 min, 1.8 min, 2.0 min, 2.2 min, 2.4 min, 2.6 min, 2.8 min, 3 min, or a value within the range obtained by combining any two of the above values.

[0064] Example 1

[0065] This embodiment provides a low-temperature sintered sharp granite saw blade. The saw blade segment is formed by sintering metal powder mixed with diamond and phosphate compound at 650°C.

[0066] The metal powder includes a first metal powder and a second metal powder, the first metal powder is Fe-Cu-Sn alloy powder, and the second metal powder is a combination of Cu-Zn and Fe powders.

[0067] The metal powder includes Fe, Cu, Sn and Zn elements. Based on the total mass of the metal powder, the mass content of the Fe element is 40%, the mass content of the Cu element is 20%, the mass content of the Sn element is 15%, and the mass content of the Zn element is 25%.

[0068] The diamond particle size in the metal powder is 270 μm.

[0069] The mass content of the phosphate compound in the metal powder is 0.5% of the mass content of the metal powder.

[0070] The phosphate compound in the metal powder is P2O5.

[0071] The mass content of diamond in the metal powder is 30% of the mass content of the metal powder.

[0072] Reference Figure 1 , Figure 1 The figure is a schematic diagram of the preparation process of a low-temperature sintered sharp granite saw blade according to the present invention.

[0073] This embodiment provides a method for preparing a low-temperature sintered sharp granite saw blade, comprising the following steps:

[0074] Mixing: adding a wetting agent to the metal powder, stirring thoroughly, then adding diamond and phosphate compound and continuing to stir until thoroughly mixed to obtain a mixed powder;

[0075] Hot pressing and sintering: the mixed powder is pressed into a blank and placed in a mold for hot pressing and sintering (temperature 650°C, pressure 80KN, time 3min) to obtain a tool head;

[0076] Grinding and brazing: the cutter head is ground and brazed on a stainless steel substrate to obtain a saw blade.

[0077] Example 2

[0078] This embodiment provides a low-temperature sintered sharp granite saw blade. The saw blade segment is formed by sintering metal powder mixed with diamond and phosphate compound at 700°C.

[0079] The metal powder includes a first metal powder and a second metal powder, the first metal powder is Fe-Cu-Sn alloy powder, and the second metal powder is a combination of Cu-Zn, Fe, and Cu powder.

[0080] The metal powder includes Fe, Cu, Sn and Zn elements. Based on the total mass of the metal powder, the mass content of the Fe element is 50%, the mass content of the Cu element is 30%, the mass content of the Sn element is 10%, and the mass content of the Zn element is 10.

[0081] The diamond particle size in the metal powder is 350 μm.

[0082] The mass content of the phosphate compound in the metal powder is 2% of the mass content of the metal powder.

[0083] The phosphate compound in the metal powder is a doping compound based on P2O5.

[0084] The mass content of diamond in the metal powder is 20% of the mass content of the metal powder.

[0085] Reference Figure 1 , Figure 1 The figure is a schematic diagram of the preparation process of a low-temperature sintered sharp granite saw blade according to the present invention.

[0086] This embodiment provides a method for preparing a low-temperature sintered sharp granite saw blade, comprising the following steps:

[0087] Mixing: adding a wetting agent to the metal powder, stirring thoroughly, then adding diamond and phosphate compound and continuing to stir until thoroughly mixed to obtain a mixed powder;

[0088] Hot pressing and sintering: the mixed powder is pressed into a blank and placed in a mold for hot pressing and sintering (temperature 700°C, pressure 100KN, time 2min) to obtain a cutter head;

[0089] Grinding and brazing: the cutter head is ground and brazed on a stainless steel substrate to obtain a saw blade.

[0090] Example 3

[0091] This embodiment provides a low-temperature sintered sharp granite saw blade. The saw blade head is made of metal powder mixed with diamond and phosphate compound sintered at 750°C.

[0092] The metal powder includes a first metal powder and a second metal powder, the first metal powder is Fe-Cu-Sn alloy powder, and the second metal powder is a combination of Cu-Zn, Fe, Cu, Sn, and Zn powders.

[0093] The metal powder includes Fe, Cu, Sn and Zn elements. Based on the total mass of the metal powder, the mass content of the Fe element is 30%, the mass content of the Cu element is 35%, the mass content of the Sn element is 15%, and the mass content of the Zn element is 20%.

[0094] The diamond particle size in the metal powder is 425 μm.

[0095] The mass content of the phosphate compound in the metal powder is 3% of the mass content of the metal powder.

[0096] The phosphate compound in the metal powder is P2O5 or a doping compound based on P2O5.

[0097] The mass content of diamond in the metal powder is 10% of the mass content of the metal powder.

[0098] Reference Figure 1 , Figure 1 The figure is a schematic diagram of the preparation process of a low-temperature sintered sharp granite saw blade according to the present invention.

[0099] This embodiment provides a method for preparing a low-temperature sintered sharp granite saw blade, comprising the following steps:

[0100] Mixing: adding a wetting agent to the metal powder, stirring thoroughly, then adding diamond and phosphate compound and continuing to stir until thoroughly mixed to obtain a mixed powder;

[0101] Hot pressing sintering: the mixed powder is pressed into a blank and placed in a mold for hot pressing sintering (temperature 750°C, pressure 120KN, time 1min) to obtain a tool head;

[0102] Grinding and brazing: the cutter head is ground and brazed on a stainless steel substrate to obtain a saw blade.

[0103] Comparative Example 1

[0104] This comparative example provides a sharp granite saw blade, wherein the saw blade head is formed by sintering metal powder mixed with diamond.

[0105] The metal powder includes a first metal powder and a second metal powder, the first metal powder is Fe-Cu-Sn alloy powder, and the second metal powder is a combination of Cu-Zn and Fe powders.

[0106] The metal powder includes Fe, Cu, Sn and Zn elements. Based on the total mass of the metal powder, the mass content of the Fe element is 40%, the mass content of the Cu element is 20%, the mass content of the Sn element is 15%, and the mass content of the Zn element is 25%.

[0107] The diamond particle size in the metal powder is 270 μm.

[0108] The mass content of diamond in the metal powder is 30% of the mass content of the metal powder.

[0109] This comparative example provides a method for preparing a sharp granite saw blade, comprising the following steps:

[0110] Mixing: adding a wetting agent to the metal powder, stirring thoroughly, then adding diamond and continuing to stir until fully mixed to obtain a mixed powder;

[0111] Hot pressing and sintering: pressing the mixed powder into a blank, placing it in a mold and hot pressing and sintering it to obtain a tool head;

[0112] Grinding and brazing: the cutter head is ground and brazed on a stainless steel substrate to obtain a saw blade.

[0113] Reference Figure 2-Figure 3 , Figure 2 This is a comparison curve of the current consumed by the granite saw blades of Example 1 of the present invention and Comparative Example 1 when cutting stone; Figure 3 This is a comparison curve of the lifespan of the granite saw blades of Example 1 of the present invention and Comparative Example 1; Figure 4 Schematic diagram of sintering of granite saw blade segments according to Example 1 of the present invention and Comparative Example 1.

[0114] The granite saw blades of Example 1 and Comparative Example 1 were subjected to a test on the change in current consumed in cutting stone, a life performance test, and a sintering process performance observation.

[0115] Depend on Figure 2 and Figure 3 It can be seen that when the granite saw blade of Example 1 is used to cut stone, not only is the sharpness better, but the service life is also long;

[0116] Depend on Figure 4 It can be seen that since no phosphate compound was added in Comparative Example 1, a glass phase could not be generated, and thus it was difficult to hold the molten low-melting-point metal, resulting in severe flow and a high weight loss rate. The weight loss rates of Example 1 and Comparative Example 1 are shown in Table 1.

[0117] Table 1 Comparison of weight loss rates of Example 1 and Comparative Example 1

[0118] Saw blade segment type Weight loss rate Example 1 1.2％ Comparative Example 1 5.4％

[0119] As shown in Table 1, the weight loss rate of Example 1 is significantly lower than that of Comparative Example 1.

[0120] It should be understood that the embodiments disclosed herein are not limited to the specific processing steps or materials disclosed herein, but should extend to equivalent substitutions of such features understood by those skilled in the relevant art. It should also be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to be limiting.

[0121] The "embodiment" mentioned in the specification means that a particular feature or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present invention. Therefore, the phrase or "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0122] Furthermore, the described features or characteristics may be combined in any other suitable manner into one or more embodiments. In the above description, some specific details, such as thickness, quantity, etc., are provided to provide a comprehensive understanding of the embodiments of the present invention. However, those skilled in the relevant art will appreciate that the present invention may be implemented without one or more of the above specific details or may be implemented using other methods, components, materials, etc.

Claims

1. A low-temperature sintered sharp granite saw blade, characterized in that: The saw blade segment is formed by sintering a metal powder mixed with diamond and phosphate compounds at 650°C to 750°C. The metal powder includes a first metal powder and a second metal powder. The first metal powder is Fe-Cu-Sn alloy powder, and the second metal powder is a combination of one or more of Cu-Zn, Fe, Cu, Sn, and Zn powders.

2. The low-temperature sintered sharp granite saw blade according to claim 1, characterized in that: The metal powder includes Fe, Cu, Sn and Zn elements. Based on the total mass of the metal powder, the mass content of the Fe element is 20% to 50%, the mass content of the Cu element is 15% to 35%, the mass content of the Sn element is 5% to 20%, and the mass content of the Zn element is 10% to 30%.

3. The low-temperature sintered sharp granite saw blade according to claim 1, characterized in that: The diamond particle size in the metal powder is 270 μm to 425 μm.

4. The low-temperature sintered sharp granite saw blade according to claim 1, characterized in that: The mass content of the phosphate compound in the metal powder is 0.5% to 3% of the mass content of the metal powder.

5. The low temperature sintered sharp granite saw blade according to claim 1, characterized in that: The phosphate compound in the metal powder is P2O5.

6. The low temperature sintered sharp granite saw blade according to claim 1, characterized in that: The phosphate compound in the metal powder is a doping compound based on P2O5.

7. The low temperature sintered sharp granite saw blade according to claim 1, characterized in that: The mass content of diamond in the metal powder is 10% to 30% of the mass content of the metal powder.

8. A method for preparing a low-temperature sintered sharp granite saw blade, characterized in that: The following steps are involved: Mixing: adding a wetting agent to the metal powder, stirring thoroughly, then adding diamond and phosphate compound and continuing to stir until thoroughly mixed to obtain a mixed powder; Hot pressing and sintering: pressing the mixed powder into a blank, placing it in a mold and hot pressing and sintering it to obtain a tool head; Grinding and brazing: grinding and brazing the cutter head onto a stainless steel substrate to obtain a saw blade; The sintering temperature is 650°C to 750°C.

9. The method for preparing a low-temperature sintered sharp granite saw blade according to claim 8, characterized in that: In hot pressing sintering, the pressure is 80KN to 120KN, and the time is 1min to 3min.

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