CN114250428A - Hard alloy material for cigar cutter and preparation method thereof - Google Patents
Hard alloy material for cigar cutter and preparation method thereof Download PDFInfo
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- CN114250428A CN114250428A CN202111315832.9A CN202111315832A CN114250428A CN 114250428 A CN114250428 A CN 114250428A CN 202111315832 A CN202111315832 A CN 202111315832A CN 114250428 A CN114250428 A CN 114250428A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
- C22C49/02—Alloys containing metallic or non-metallic fibres or filaments characterised by the matrix material
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C47/00—Making alloys containing metallic or non-metallic fibres or filaments
- C22C47/14—Making alloys containing metallic or non-metallic fibres or filaments by powder metallurgy, i.e. by processing mixtures of metal powder and fibres or filaments
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
- C22C49/14—Alloys containing metallic or non-metallic fibres or filaments characterised by the fibres or filaments
Abstract
The invention discloses a hard alloy material for a cigar cutter and a preparation method thereof. The preparation method of the hard alloy material for the cigar cutter comprises the following raw materials in percentage by weight: 88% -95% of tungsten carbide powder; 0-10% of cobalt powder; 0-10% of nickel powder; 0 to 0.02 percent of high-purity carbon black powder; 0 to 0.3 percent of tungsten powder; tantalum carbide 0-0.5%; 0-1% of chromium carbide; 0 to 0.5 percent of niobium carbide; 0-0.5% of aluminum nitride whisker; 0-0.5% of titanium nitride whisker; the sum of the weight percentages of the raw materials is 100 percent. The hard alloy material disclosed by the invention has good hardness, wear resistance, toughness and strength, can be used for preparing cigar knife blades, and when the hard alloy material is used, the cutting edges are not easy to passivate or curl, tar is not easy to adhere to the blades, the replacement frequency of the blades is low, the overall quality of the cigar knife and the use experience of a user are greatly improved, and the use cost is reduced.
Description
Technical Field
The invention relates to the field of hard alloy materials, in particular to a hard alloy material for a cigar cutter and a preparation method thereof.
Background
Cigars are tobacco products made from dried and fermented tobacco rolls and require a special cigar cutter to cut the end of the cigar when smoked, despite being a small pair of scissors, the manufacturer can expend the effort in its design, materials and accessories, making it more attractive, tasting and, of course, more expensive.
The cigar cutter body on the market at present is made of iron-based materials such as stainless steel, high-speed steel and the like. Although the material processing is relatively simple, the texture hardness is still soft, the blade edge is easy to passivate or curl after long-time use or improper use, the cigar cap is more difficult to cut off by the blade edge under the same acting force, the use convenience of the cigar knife is directly influenced, the blade is frequently replaced or the cigar knife is integrally discarded by a user, the overall quality of the cigar knife and the use experience of the cigar knife user are influenced, and the use cost is high.
The applicant has found that the prior art has at least the following technical problems:
1. in the prior art, the hardness of the material for preparing the cigar knife is lower, for example, the Rockwell hardness of the common material 440 stainless steel is less than 60HRC (nucleus 81.2HRA), the hardness of the harder high-speed steel is usually less than 70HRC (nucleus 86HRA), the cutting edge is easy to passivate or curl, the replacement frequency of the blade is high, the integral quality of the cigar knife and the use experience of a user are influenced, and the use cost is high.
2. Because the cigar tobacco leaves contain grease such as tar, the material of the existing cigar knife is easy to adhere to the tar in the cutting process and is difficult to remove after being used for a long time, and the quality of the cigar knife is directly influenced.
Disclosure of Invention
The invention aims to provide a hard alloy material for a cigar knife, which aims to solve the technical problems that the hardness of the material for preparing the cigar knife is low, the cutting edge is easy to passivate or curl, the replacement frequency of the blade is high, dirt is easy to be contained, the overall quality of the cigar knife and the use experience of a user are influenced, and the use cost is high in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a hard alloy material for a cigar cutter, which is prepared from the following raw materials in percentage by weight: 88% -95% of tungsten carbide powder; 0-10% of cobalt powder; 0-10% of nickel powder; 0 to 0.02 percent of high-purity carbon black powder; 0 to 0.3 percent of tungsten powder; tantalum carbide 0-0.5%; 0-1% of chromium carbide; 0 to 0.5 percent of niobium carbide; 0-0.5% of aluminum nitride whisker; 0-0.5% of titanium nitride whisker; the sum of the weight percentages of the raw materials is 100 percent.
Further, the weight percentages of the raw materials are respectively as follows: 88% -92% of tungsten carbide powder; 6-10% of cobalt powder; 0-8% of nickel powder; 0-0.01% of high-purity carbon black powder; 0-0.1% of tungsten powder; tantalum carbide 0.3-0.5%; 0.5 to 0.8 percent of chromium carbide; 0.3 to 0.5 percent of niobium carbide; 0.2 to 0.3 percent of aluminum nitride crystal whisker; 0.2 to 0.3 percent of titanium nitride whisker; the sum of the weight percentages of the raw materials is 100 percent.
Further, the weight percentages of the raw materials are respectively as follows: 88.79% of tungsten carbide powder; 9% of cobalt powder; 0.01 percent of high-purity carbon black powder; 0.4% of tantalum carbide; 0.8 percent of chromium carbide; 0.4 percent of niobium carbide; 0.3 percent of aluminum nitride whisker; 0.3 percent of titanium nitride whisker.
Furthermore, the preparation method also comprises a forming agent, and the adding amount of the forming agent is 1.5-3% of the total weight of the raw materials.
Further, the forming agent is paraffin or PEG.
The invention provides a preparation method of a hard alloy material for a cigar cutter, which comprises the following steps:
(1) mixing: mixing the raw materials according to a ratio to obtain a uniformly mixed mixture;
(2) drying and granulating: drying and granulating the mixture obtained in the step (1) to obtain powder;
(3) pressing: pressing the powder obtained in the step (2) into a pressed blank with a required shape through a die;
(4) and (3) sintering: and (4) sintering the pressed compact obtained in the step (3) to obtain the hard alloy material for the cigar cutter.
Further, in the step (1), a ball mill is adopted for wet ball milling, the ball milling time is 30-90 hours, a forming agent is added during ball milling, and the adding amount of the forming agent is 1.5-3% of the total weight of the raw materials; the ball milling medium is ethanol or hexane, and the addition amount of the ball milling medium is 30-45% of the weight of the raw materials; the grinding balls are hard alloy balls or grinding rods, and the dosage of the grinding balls is 3-6 times of the total weight of the raw materials.
Further, in the step (2), spray drying granulation is adopted: the drying medium is high-temperature nitrogen, the oxygen content in the spray drying tower is ensured to be less than 2 percent, the spray pressure is 900-1500kPa, the nozzle size is 0.8-1.5mm, and the outlet temperature is controlled to be 93-98 ℃.
Further, in the step (3), a bidirectional die pressing mode is adopted: the thickness of the obtained pressed compact is adaptive to that of the cigar blade, and the shrinkage coefficient of the pressed compact is 1.2-1.25.
Further, in the step (4), a vacuum degreasing and low-pressure sintering mode is adopted, and the vacuum degreasing is as follows: heating from room temperature to 800 ℃ is a vacuum degreasing process, and the temperature is kept at 400 ℃ for 4-7 hours at 200-; low-pressure sintering: the sintering temperature is 1400 ℃ and 1500 ℃, the pressure is 4-6MPa, and the sintering temperature is kept for 0.5-1 hour.
Further, during vacuum degreasing, the temperature rising speed is controlled to be less than or equal to 6 ℃/min in the process of rising the temperature from room temperature to 200 ℃ and rising the temperature from 400 ℃ to 800 ℃.
Based on the technical scheme, the embodiment of the invention can at least produce the following technical effects:
(1) the hard alloy material for the cigar cutter and the preparation method thereof provided by the invention take tungsten carbide, cobalt and nickel as main materials, and are main components of the hard alloy, and the properties and the mixture ratio of the main materials directly influence the performance of the whole material. Tungsten carbide is used as a hard phase, the Mohs hardness of the tungsten carbide can reach 9-9.5 (currently, the hardness of the existing hardest diamond is 10, and the hardness of iron is only 4-5), a framework is provided for the hard alloy, the tungsten carbide has extremely high hardness and melting point (can reach 2870 ℃), and the hardness and the wear resistance of the material are directly determined by the properties and the proportion of the tungsten carbide; cobalt and nickel are used as binding phases, and the cobalt and nickel and the hard phase are subjected to wet ball milling mixing, drying, granulating, pressing, high-temperature sintering and cooling, so that the hardening phases are uniformly distributed in a grid formed by binding metals and are tightly connected with each other to form a firm whole. The hardness of cemented carbide depends on the hard phase content and grain size, i.e., the higher the hard phase content, the finer the grains, the greater the hardness. The toughness of the hard alloy is determined by the binder phase metal, and the higher the content of the binder metal is, the higher the bending strength is.
(2) The invention provides a hard alloy material for cigar knives and a preparation method thereof, which takes high-purity carbon black powder and tungsten powder as regulators; in the cemented carbide, the theoretical WC carbon content is 6.128%, and when the WC carbon content is greater than the theoretical carbon content, free carbon (WC + C, carburization) appears in WC. The existence of free carbon enables WC crystal grains around the free carbon to grow up during sintering, so that the hard alloy crystal grains are not uniform, carburization occurs simultaneously, and the hardness and the wear resistance of the material are reduced rapidly, so that the use condition cannot be met; when the carbon content of WC is less than the theoretical carbon content, a decarbonized phase (eta phase) appears in WC, which can cause the toughness value of the hard alloy material to be sharply reduced and is easy to break during the use. Therefore, the carbon content of the hard alloy is adjusted by the high-purity carbon black powder and the tungsten powder, the high-purity carbon black powder plays a role in improving the carbon content, and the tungsten powder plays a role in reducing the carbon content; the carbon content of the hard alloy material is at a proper carbon content level through the matching of the tungsten carbide powder, the high-purity carbon black powder and the tungsten powder, so that the uniformity of crystal grains of the hard alloy material is ensured, the hard alloy material has higher hardness, the hard alloy material has good toughness, and the situation of collapse and shortage is avoided in the using process.
(3) The hard alloy material for the cigar cutter and the preparation method thereof provided by the invention take tantalum carbide, chromium carbide, niobium carbide, aluminum nitride whiskers and/or titanium nitride whiskers as reinforcing agents; the tantalum carbide improves the alloy performance by improving the fiber structure and the phase change dynamics, so that the alloy has higher strength, phase stability and processing deformability, and the service life of the material is prolonged. The chromium carbide and the niobium carbide inhibit the dissolution and precipitation process of a hard phase in a liquid phase in the high-temperature liquid phase sintering process so as to inhibit the growth of hard phase grains, further improve the hardness, the wear resistance and the impact resistance of the alloy and greatly improve the comprehensive performance. The addition of aluminium nitride and titanium nitride crystal whisker can strengthen the net structure inside the hard alloy, and can raise the strength, toughness and shock resistance of the hard alloy greatly.
(4) Compared with the common metal material, the hardness and the wear resistance of the prepared hard alloy material are greatly improved, and in the use process of the blade after production and polishing, as the blade made of the hard alloy material has the characteristics of high temperature resistance, oxidation resistance, high hardness, high surface smoothness and high sharpness, the surface of the blade after processing can achieve a mirror surface effect, the cigar tobacco leaves contain high plant fibers, when the blade made of the hard alloy material is used for shearing, the plant fibers can be sheared and broken easily due to the high sharpness of the blade, and as the material has low affinity, tar generated in the smoking process of cigar smoke is not easy to adhere to the surface of the blade when the tar is cut; moreover, as the hardness and the wear resistance of the blade are better, the wear condition of the blade is greatly reduced, and further, as the service life is prolonged, tar generated by cigars is not easy to adhere like iron-based materials such as stainless steel, high-speed steel and the like, so that the quality of the cigar knife is greatly improved; in addition, the hard alloy material in the invention has higher hardness and wear resistance, so that when the hard alloy material is made into a cigar knife blade for use, the cutting edge is not easy to passivate or curl, the replacement frequency of the blade is low, the overall quality of the cigar knife and the use experience of a user are greatly improved, and the use cost is reduced.
Detailed Description
Firstly, raw material description:
in examples 1-10, the starting materials used are illustrated:
tungsten carbide powder: the purity is more than or equal to 99.8 percent; FSSS particle size 0.4-0.6 μm (examples 1-5), FSSS particle size 0.8-1.2 μm (examples 6-10);
cobalt powder: FSSS particle size 0.8-3.0 μm (examples 1-5); FSSS particle size 0.8-1.2 μm (examples 6-10);
nickel powder: the grain size of FSSS is 0.8-3 μm;
high purity carbon black powder: the purity is more than 99.1 percent;
tungsten powder: the purity is more than or equal to 99.9 percent, and the FSSS granularity is 0.4-1.0 mu m;
tantalum carbide: the granularity is 0.6-3 mu m;
and (3) chromium carbide: the granularity is 0.6-3 mu m;
niobium carbide: the granularity is 0.6-3 mu m;
aluminum nitride whisker: the granularity is 10-30 mu m;
titanium nitride whisker: the granularity is 10-30 mu m;
second, preparation example
1. The weight percentages of the raw materials in examples 1-10 are shown in table 1 below:
table 1 examples raw material table
2. Preparation method
Example 1:
the method comprises the following steps:
(1) mixing: mixing the raw materials according to a ratio to obtain a uniformly mixed mixture;
carrying out wet ball milling by using a ball mill, wherein the ball milling time is 90 hours, a forming agent is added during ball milling, the forming agent is paraffin, and the addition amount of the forming agent is 1.5 percent of the total weight of the raw materials; the ball milling medium is hexane, and the addition amount of the ball milling medium is 30 percent of the weight of the raw materials; the grinding ball is a grinding rod, and the dosage of the grinding ball is 3 times of the total weight of the raw materials;
(2) drying and granulating: drying and granulating the mixture obtained in the step (1) to obtain powder;
adopting spray drying granulation: the drying medium is high-temperature nitrogen, the oxygen content in the spray drying tower is ensured to be less than 2%, the spraying pressure is 1500kPa, the nozzle size is 1.5mm, and the outlet temperature is controlled at 98 ℃;
(3) pressing: pressing the powder obtained in the step (2) into a pressed blank with a required shape through a die;
adopting a bidirectional mould pressing mode: the thickness of the obtained pressed compact is adaptive to that of the cigar blade, the contraction coefficient of the pressed compact is 1.23, and the height of the pressed compact is 1.97mm (the pressed compact is in the shape of a pre-blade, a pressed compact is directly prepared into a blade for experiment subsequently, and the shape of the pre-blade is convenient for grinding the pressed compact into the shape of the blade subsequently);
(4) and (3) sintering: sintering the pressed compact obtained in the step (3) by adopting a vacuum degreasing and low-pressure sintering mode:
vacuum degreasing: heating from room temperature to 800 ℃ is a vacuum degreasing process, and keeping the temperature at 400 ℃ for 4 hours; controlling the temperature rising speed to be 6 ℃/min in the process of rising the temperature from room temperature to 200 ℃ and from 400 ℃ to 800 ℃;
low-pressure sintering: sintering temperature is 1430 ℃, pressurizing pressure is 4MPa, and keeping for 1 hour to obtain the hard alloy material for the cigar cutter.
Example 2:
the method comprises the following steps:
(1) mixing: mixing the raw materials according to a ratio to obtain a uniformly mixed mixture;
carrying out wet ball milling by using a ball mill, wherein the ball milling time is 60 hours, a forming agent is added during ball milling, the forming agent adopts PEG, and the adding amount of the forming agent is 2 percent of the total weight of the raw materials; the ball milling medium is ethanol, and the addition amount of the ball milling medium is 40 percent of the weight of the raw materials; the grinding balls are hard alloy balls, and the dosage of the grinding balls is 4 times of the total weight of the raw materials;
(2) drying and granulating: drying and granulating the mixture obtained in the step (1) to obtain powder;
adopting spray drying granulation: the drying medium is high-temperature nitrogen, the oxygen content in the spray drying tower is ensured to be less than 2%, the spraying pressure is 1200kPa, the nozzle size is 1.2mm, and the outlet temperature is controlled at 95 ℃;
(3) pressing: pressing the powder obtained in the step (2) into a pressed blank with a required shape through a die;
the shrinkage coefficient of a pressed compact is 1.23, the height of the pressed compact is 1.97mm (the pressed compact is in the shape of a pre-cutting blade, a pressed compact is directly prepared into a cutting blade for experiment, and the shape of the pre-cutting blade is convenient for grinding the pressed compact into the shape of the cutting blade in the follow-up process);
(4) and (3) sintering: sintering the pressed compact obtained in the step (3) by adopting a vacuum degreasing and low-pressure sintering mode:
vacuum degreasing: heating from room temperature to 800 ℃ is a vacuum degreasing process, and the temperature is kept at 400 ℃ for 6 hours at 200-; controlling the temperature rising speed to be 5 ℃/min in the process of rising the temperature from room temperature to 200 ℃ and rising the temperature from 400 ℃ to 800 ℃;
low-pressure sintering: sintering at 1430 deg.c and 5MPa for 0.8 hr to obtain hard alloy material for cigar cutter.
Example 3:
the method comprises the following steps:
(1) mixing: mixing the raw materials according to a ratio to obtain a uniformly mixed mixture;
carrying out wet ball milling by using a ball mill, wherein the ball milling time is 30 hours, a forming agent is added during ball milling, the forming agent is paraffin, and the adding amount of the forming agent is 3 percent of the total weight of the raw materials; the ball milling medium is ethanol, and the addition amount of the ball milling medium is 30 percent of the weight of the raw materials; the grinding balls are hard alloy balls, and the dosage of the grinding balls is 3 times of the total weight of the raw materials;
(2) drying and granulating: drying and granulating the mixture obtained in the step (1) to obtain powder;
adopting spray drying granulation: the drying medium is high-temperature nitrogen, the oxygen content in the spray drying tower is ensured to be less than 2%, the spray pressure is 900kPa, the nozzle size is 0.8mm, and the outlet temperature is controlled at 93 ℃;
(3) pressing: pressing the powder obtained in the step (2) into a pressed blank with a required shape through a die;
adopting a bidirectional mould pressing mode: the thickness of the obtained pressed compact is adaptive to that of the cigar blade, the contraction coefficient of the pressed compact is 1.23, and the height of the pressed compact is 1.97mm (the pressed compact is in the shape of a pre-blade, a pressed compact is directly prepared into a blade for experiment subsequently, and the shape of the pre-blade is convenient for grinding the pressed compact into the shape of the blade subsequently);
(4) and (3) sintering: sintering the pressed compact obtained in the step (3) by adopting a vacuum degreasing and low-pressure sintering mode:
vacuum degreasing: heating from room temperature to 800 ℃ is a vacuum degreasing process, and keeping the temperature at 200 ℃ for 7 hours; controlling the temperature rising speed to be 4 ℃/min in the process of rising the temperature from room temperature to 200 ℃ and from 400 ℃ to 800 ℃;
low-pressure sintering: sintering at 1430 deg.c and 6MPa for 0.5 hr to obtain hard alloy material for cigar cutter.
Example 4:
the method comprises the following steps:
(1) mixing: mixing the raw materials according to a ratio to obtain a uniformly mixed mixture;
carrying out wet ball milling by using a ball mill, wherein the ball milling time is 80 hours, a forming agent is added during ball milling, the forming agent adopts PEG, and the adding amount of the forming agent is 2 percent of the total weight of the raw materials; the ball milling medium is hexane, and the addition amount of the ball milling medium is 35 percent of the weight of the raw materials; the grinding balls are hard alloy balls, and the dosage of the grinding balls is 5 times of the total weight of the raw materials;
(2) drying and granulating: drying and granulating the mixture obtained in the step (1) to obtain powder;
adopting spray drying granulation: the drying medium is high-temperature nitrogen, the oxygen content in the spray drying tower is ensured to be less than 2%, the spray pressure is 1000kPa, the nozzle size is 1.0mm, and the outlet temperature is controlled at 96 ℃;
(3) pressing: pressing the powder obtained in the step (2) into a pressed blank with a required shape through a die;
adopting a bidirectional mould pressing mode: the thickness of the obtained pressed compact is adaptive to that of the cigar blade, the contraction coefficient of the pressed compact is 1.23, and the height of the pressed compact is 1.97mm (the pressed compact is in the shape of a pre-blade, a pressed compact is directly prepared into a blade for experiment subsequently, and the shape of the pre-blade is convenient for grinding the pressed compact into the shape of the blade subsequently);
(4) and (3) sintering: sintering the pressed compact obtained in the step (3) by adopting a vacuum degreasing and low-pressure sintering mode:
vacuum degreasing: heating from room temperature to 800 ℃ is a vacuum degreasing process, and preserving heat for 6 hours at 250 ℃; controlling the temperature rising speed to be 4 ℃/min in the process of rising the temperature from room temperature to 200 ℃ and from 400 ℃ to 800 ℃;
low-pressure sintering: the sintering temperature is 1440 ℃, the pressurizing pressure is 4.5MPa, and the sintering temperature is kept for 0.8 hour, thus obtaining the hard alloy material for the cigar knife.
Example 5:
the method comprises the following steps:
(1) mixing: mixing the raw materials according to a ratio to obtain a uniformly mixed mixture;
performing wet ball milling by using a ball mill, wherein the ball milling time is 40 hours, a forming agent is added during ball milling, the forming agent adopts PEG, and the adding amount of the forming agent is 2.5 percent of the total weight of the raw materials; the ball milling medium is hexane, and the addition amount of the ball milling medium is 40 percent of the weight of the raw materials; the grinding ball is a grinding rod, and the dosage of the grinding ball is 4 times of the total weight of the raw materials;
(2) drying and granulating: drying and granulating the mixture obtained in the step (1) to obtain powder;
adopting spray drying granulation: the drying medium is high-temperature nitrogen, the oxygen content in the spray drying tower is ensured to be less than 2%, the spray pressure is 1300kPa, the nozzle size is 1.3mm, and the outlet temperature is controlled at 94 ℃;
(3) pressing: pressing the powder obtained in the step (2) into a pressed blank with a required shape through a die;
adopting a bidirectional mould pressing mode: the thickness of the obtained pressed compact is adaptive to that of the cigar blade, the contraction coefficient of the pressed compact is 1.23, and the height of the pressed compact is 1.97mm (the pressed compact is in the shape of a pre-blade, a pressed compact is directly prepared into a blade for experiment subsequently, and the shape of the pre-blade is convenient for grinding the pressed compact into the shape of the blade subsequently);
(4) and (3) sintering: sintering the pressed compact obtained in the step (3) by adopting a vacuum degreasing and low-pressure sintering mode:
vacuum degreasing: heating from room temperature to 800 ℃ is a vacuum degreasing process, and keeping the temperature at 350 ℃ for 5 hours; controlling the temperature rising speed to be 6 ℃/min in the process of rising the temperature from room temperature to 200 ℃ and from 400 ℃ to 800 ℃;
low-pressure sintering: sintering at 1480 deg.c and under 5.5MPa for 0.6 hr to obtain the hard alloy material for cigar cutter.
Example 6-example 10:
the preparation method is the same as example 2.
Third, comparative example
Comparative example 1:
a cigar CUTTER (blade material 440 stainless steel, hardness HRC57) manufactured by Xika Xikar, USA, model 157VX 2V-CUTTER, was used as comparative example 1.
Comparative example 2:
cigar knives (blade material high speed steel, hardness HRC64) produced by cuba gahitba coihiba were comparative example 2.
Fourth, example of experiment
1. The cemented carbide materials prepared in examples 1-10 were tested for properties:
(1) and (4) testing standard:
rockwell hardness: GB/T3849.1-2015; bending strength: GB/T3851-2015; fracture toughness: GB/T33819 and 2017.
(2) The results are shown in table 2 below:
table 2 example hard alloy material property test results
2. The cemented carbide materials prepared in examples 1-10 were prepared in the same way into the same cigar knives for cigar continuous shear testing:
(1) the preparation method of the blade comprises the following steps:
preparing a blade with the thickness of 1.2mm, and specifically preparing the blade by the following steps:
a1, end face grinding: grinding the end face of the blade by using a grinding machine;
double-end-face grinding is adopted during grinding to ensure the grinding consistency of the upper surface and the lower surface of a product, the product is placed in a copying tool disc during grinding, a blade is placed in the copying tool disc, the grinding pressure is set to be 300MPa during grinding, the granularity of a grinding wheel is 600 meshes, and the thickness of the ground product is 1.2 +/-0.05 mm;
a2, slotting: slotting the crescent blade of the blade with the ground end face by using a grinding machine;
slotting of the crescent blade is carried out by using a slotting machine and a diamond grinding wheel, the diameter of the grinding wheel is 200mm, the granularity of the grinding wheel is W28, and the width of the blade is 4.5 mm;
a3, passivation: passivating the cutting edge of the blade by using a diamond brush;
2 diamond brushes are used for blade edge treatment in passivation, the particle sizes of the brushes are respectively 600 meshes and 800 meshes, and the passivation size is 0.02-0.04 mm;
a4, cleaning: and cleaning the blade after the passivation treatment, wherein deionized water is adopted during cleaning to obtain a finished blade product.
(2) Preparing the blades made of the hard alloy materials prepared in the examples 1 to 10 together with other accessories into cigar knives, carrying out cigar continuous shearing tests in the same way as the comparative example 1 and the comparative example 2, wherein the shearing frequency of each cigar knife to cigars is 400 times, and comparing the edge parts and the surface conditions of the cigar knives and the surface quality of the cigar cutting surfaces after the experiments are finished; when the experiment is carried out, the cigars are ignited firstly, the cigars are naturally extinguished, the end which is burnt before is cut off after the cigars are placed for two hours, the cut-off length is based on the section which is just burnt, in order to avoid waste, the cigars can be continuously ignited after the end which is burnt is cut off, the cigars are extinguished again and placed, and the cutting experiment is continued until the cutting experiment can not be carried out, and the result is detailed in the following table 3:
table 3 cigar continuous shear test results
Claims (10)
1. The hard alloy material for the cigar cutter is characterized by comprising the following raw materials in percentage by weight: 88% -95% of tungsten carbide powder; 0-10% of cobalt powder; 0-10% of nickel powder; 0 to 0.02 percent of high-purity carbon black powder; 0 to 0.3 percent of tungsten powder; tantalum carbide 0-0.5%; 0-1% of chromium carbide; 0 to 0.5 percent of niobium carbide; 0-0.5% of aluminum nitride whisker; 0-0.5% of titanium nitride whisker; the sum of the weight percentages of the raw materials is 100 percent.
2. The cemented carbide material for cigar knives according to claim 1, characterized in that the weight percentages of the raw materials are: 88% -92% of tungsten carbide powder; 6-10% of cobalt powder; 0-8% of nickel powder; 0-0.01% of high-purity carbon black powder; 0-0.1% of tungsten powder; tantalum carbide 0.3-0.5%; 0.5 to 0.8 percent of chromium carbide; 0.3 to 0.5 percent of niobium carbide; 0.2 to 0.3 percent of aluminum nitride crystal whisker; 0.2 to 0.3 percent of titanium nitride whisker; the sum of the weight percentages of the raw materials is 100 percent.
3. The cemented carbide material for cigar knives according to claim 1, characterized in that the weight percentages of the raw materials are: 88.79% of tungsten carbide powder; 9% of cobalt powder; 0.01 percent of high-purity carbon black powder; 0.4% of tantalum carbide; 0.8 percent of chromium carbide; 0.4 percent of niobium carbide; 0.3 percent of aluminum nitride whisker; 0.3 percent of titanium nitride whisker.
4. The cemented carbide material for cigar knives according to any one of claims 1 to 3, characterized in that it is prepared by further comprising a forming agent, said forming agent being added in an amount of 1.5-3% by weight of the total weight of the raw materials.
5. The cemented carbide material for cigar knives according to claim 4, wherein the forming agent is paraffin or PEG.
6. The method for preparing a cemented carbide material for cigar knives according to any one of claims 1-5, characterized by the following steps:
(1) mixing: mixing the raw materials according to a ratio to obtain a uniformly mixed mixture;
(2) drying and granulating: drying and granulating the mixture obtained in the step (1) to obtain powder;
(3) pressing: pressing the powder obtained in the step (2) into a pressed blank with a required shape through a die;
(4) and (3) sintering: and (4) sintering the pressed compact obtained in the step (3) to obtain the hard alloy material for the cigar cutter.
7. The preparation method of the hard alloy material for the cigar cutter as claimed in claim 6, wherein in the step (1), the wet ball milling is carried out by a ball mill, the ball milling time is 30-90 hours, and a forming agent is added during the ball milling, wherein the adding amount of the forming agent is 1.5-3% of the total weight of the raw materials; the ball milling medium is ethanol or hexane, and the addition amount of the ball milling medium is 30-45% of the weight of the raw materials; the grinding balls are hard alloy balls or grinding rods, and the dosage of the grinding balls is 3-6 times of the total weight of the raw materials.
8. The method for preparing a cemented carbide material for cigar knives according to claim 6, characterized in that in the step (2), spray drying granulation is adopted: the drying medium is high-temperature nitrogen, the oxygen content in the spray drying tower is ensured to be less than 2 percent, the spray pressure is 900-1500kPa, the nozzle size is 0.8-1.5mm, and the outlet temperature is controlled to be 93-98 ℃.
9. The method for preparing a cemented carbide material for cigar knives according to claim 6, wherein in the step (3), the bi-directional die pressing is adopted, and the shrinkage coefficient of the pressed compact is 1.2-1.25.
10. The method for preparing a cemented carbide material for cigar knives according to claim 6, wherein in the step (4), vacuum degreasing and low pressure sintering are adopted, and the vacuum degreasing is carried out: heating from room temperature to 800 ℃ is a vacuum degreasing process, and the temperature is kept at 400 ℃ for 4-7 hours at 200-; low-pressure sintering: the sintering temperature is 1400 ℃ and 1500 ℃, the pressure is 4-6MPa, and the sintering temperature is kept for 0.5-1 hour.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2009123503A (en) * | 2006-11-20 | 2010-12-27 | Кабусики Кайся Миянага (Jp) | CARBIDE TIP AND METHOD FOR ITS PRODUCTION |
| CN108950343A (en) * | 2018-08-01 | 2018-12-07 | 四川理工学院 | A kind of WC based hard alloy material and preparation method thereof based on high-entropy alloy |
| CN109355522A (en) * | 2018-10-30 | 2019-02-19 | 湖南工业大学 | A kind of novel hard alloy and preparation method thereof |
| CN111471942A (en) * | 2020-03-25 | 2020-07-31 | 成都美奢锐新材料有限公司 | Nanocrystalline composite material for 3C product and preparation method thereof |
| CN111515401A (en) * | 2020-05-06 | 2020-08-11 | 江西中孚硬质合金股份有限公司 | Hard alloy material for paper industry roller cutter, roller cutter blank preparation method and roller cutter blank |
-
2021
- 2021-11-08 CN CN202111315832.9A patent/CN114250428A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2009123503A (en) * | 2006-11-20 | 2010-12-27 | Кабусики Кайся Миянага (Jp) | CARBIDE TIP AND METHOD FOR ITS PRODUCTION |
| CN108950343A (en) * | 2018-08-01 | 2018-12-07 | 四川理工学院 | A kind of WC based hard alloy material and preparation method thereof based on high-entropy alloy |
| CN109355522A (en) * | 2018-10-30 | 2019-02-19 | 湖南工业大学 | A kind of novel hard alloy and preparation method thereof |
| CN111471942A (en) * | 2020-03-25 | 2020-07-31 | 成都美奢锐新材料有限公司 | Nanocrystalline composite material for 3C product and preparation method thereof |
| CN111515401A (en) * | 2020-05-06 | 2020-08-11 | 江西中孚硬质合金股份有限公司 | Hard alloy material for paper industry roller cutter, roller cutter blank preparation method and roller cutter blank |
Non-Patent Citations (1)
| Title |
|---|
| 刘鹏德等: "《金属切割原理与刀具》", 31 March 2016, 吉林大学出版社 * |
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