CN112138835A - Shaping method of cubic boron nitride and application thereof - Google Patents
Shaping method of cubic boron nitride and application thereof Download PDFInfo
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- CN112138835A CN112138835A CN202010910331.4A CN202010910331A CN112138835A CN 112138835 A CN112138835 A CN 112138835A CN 202010910331 A CN202010910331 A CN 202010910331A CN 112138835 A CN112138835 A CN 112138835A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
- B02C21/007—Disintegrating plant with or without drying of the material using a combination of two or more drum or tube mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/36—Adding fluid, other than for crushing or disintegrating by fluid energy the crushing or disintegrating zone being submerged in liquid
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Abstract
The invention relates to the technical field of superhard material shaping treatment, and particularly discloses a cubic boron nitride shaping method and application thereof.
Description
Technical Field
The invention relates to the technical field of superhard material shaping treatment, in particular to a shaping method of cubic boron nitride and application thereof.
Background
The cubic boron nitride has high hardness and good wear resistance, is widely applied to the machining industry, can be used for producing cubic boron nitride grinding tools, and has important significance for the grinding processing technology.
Generally, products with a certain grain size of the cubic boron nitride variety are sufficient in inventory or are not needed in the market, the products with the grain size are subjected to secondary processing, and are processed into the required product grain size (namely, the target grain size, which is generally one or more grain size numbers finer than the original grain size) by a shaping method, so that a finished product of the cubic boron nitride with the target grain size is obtained, and the products with the original grain size are called regrind materials. The conventional cubic boron nitride regrind material is mainly processed (usually dry grinding) through a self-made rotary shaping device to obtain a cubic boron nitride finished product with a target granularity, specifically, a ball milling tank is filled with steel balls with a certain proportion, dry grinding is carried out according to a certain ball-to-material ratio (generally, each ball milling tank is filled with 5000-; then the cubic boron nitride product is processed cleanly by chemical methods such as acid, alkali and the like. The method has the advantages of simple operation and good product isovolumetric shape (bulk density).
However, the above technical solutions have the following disadvantages in practical use: the problems of large dust, high manpower consumption, low success rate of target granularity products, less one-time feeding and the like exist when the existing cubic boron nitride products are processed back to grinding materials by a shaping method, so that the labor efficiency is reduced, the labor intensity is increased, the equal volume cannot be freely mastered according to the requirements of customers, and the industrial production is not facilitated. Therefore, a new shaping method of cubic boron nitride is urgently needed to be found, so that the labor efficiency is improved, and the labor intensity is reduced.
Disclosure of Invention
An embodiment of the present invention provides a method for shaping cubic boron nitride, so as to solve the problems of low labor efficiency and increased labor intensity when an existing cubic boron nitride product provided in the above background art is processed back to an abrasive material by a shaping method.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a shaping method of cubic boron nitride comprises the operations of dry grinding and wet grinding, and specifically comprises the following steps:
1) dry grinding: adding cubic boron nitride which needs to be processed into a target granularity as an abrasive regrind material into a dry ball milling device which is added with steel balls in advance for dry milling to obtain a dry milling material, wherein a discharge hole of the dry ball milling device is communicated with a rotary vibration screening device so as to input the dry milling material into the rotary vibration screening device after the dry milling, the abrasive regrind material granularity in the dry milling is larger than the target granularity (generally, the abrasive regrind material granularity in the dry milling is larger than the target granularity by one granularity number, specifically, the granularity of a cubic boron nitride product which needs to be processed into the target granularity is respectively 50-60 meshes, 60-70 meshes, 70-80 meshes, 80-100 meshes, 100-plus-120 meshes, 120-plus-140 meshes, 140-plus-170 meshes, 170-plus-200 meshes, 200-230-plus-270 meshes, 270-plus-325 meshes and 325-400 meshes from coarse to fine, correspondingly, the granularity of the cubic boron nitride product which needs to be processed into the target granularity is 50-60 meshes, and the target granularity which is larger than one granularity is 60-70 meshes);
2) wet grinding: and in the dry grinding process, adding the obtained dry grinding material input into the rotary vibration screening device into a wet grinding device, and adding water for wet grinding to obtain a finished cubic boron nitride product with the target particle size, wherein the adding amount of the water is 0.1-5 times of the weight of the regrind material.
Another object of the embodiments of the present invention is to provide a cubic boron nitride product with a target grain size, which is prepared by the above shaping method of cubic boron nitride.
Another object of an embodiment of the present invention is to provide a use of the above-mentioned cubic boron nitride product with a target grain size as cubic boron nitride abrasive grains in grinding tool machining.
Another object of an embodiment of the present invention is to provide an application of the above method for shaping cubic boron nitride in abrasive machining for grinding tools.
Compared with the prior art, the invention has the beneficial effects that:
the shaping method of the cubic boron nitride provided by the embodiment of the invention comprises dry grinding and wet grinding operations, and the dry-wet mixing shaping method can improve the labor efficiency, improve the yield of the target granularity, freely master the isovolumetric shape, reduce the labor intensity, reduce the dust, optimize the environment, facilitate the industrial production, obviously reduce the production cost, solve the problems of low labor efficiency and increased labor intensity when the existing cubic boron nitride product is processed into the abrasive material by the shaping method, and has wide market prospect.
Detailed Description
The present invention will be described in further detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention. The invention is only a brand new shaping method of cubic boron nitride, and part of the content adopts standard equipment or the prior art, namely, the parts which are not related in the invention can be realized by the prior art, and are not described again.
The shaping method of the cubic boron nitride provided by the embodiment of the invention comprises the operations of dry grinding and wet grinding, and the shaping method of the cubic boron nitride specifically comprises the following steps:
1) dry grinding: adding cubic boron nitride which needs to be processed into a target granularity as an abrasive regrind material into a dry ball milling device which is added with steel balls in advance for dry milling to obtain a dry milling material, wherein a discharge port of the dry ball milling device is communicated with a rotary vibration screening device so as to input the dry milling material into the rotary vibration screening device after dry milling, and the size of the abrasive regrind material in the dry milling is larger than the size of the target granularity;
2) wet grinding: and in the dry grinding process, adding the obtained dry grinding material input into the rotary vibration screening device into a wet grinding device, and adding water for wet grinding to obtain a cubic boron nitride finished product with the target particle size.
As another preferred embodiment of the present invention, in the method for reshaping cubic boron nitride, the size of the regrind particle size in the dry grinding is larger than the target particle size (usually, the regrind particle size in the dry grinding is larger than the target particle size by one particle size, i.e. the dry grinding process is only suitable for the case that the regrind particle size is larger than the target particle size by one particle size, specifically, the particle sizes of cubic boron nitride products to be processed into the target particle size are respectively 50-60 mesh, 60-70 mesh, 70-80 mesh, 80-100 mesh, 100-120-mesh, 120-140-mesh, 140-170-mesh, 170-200-mesh, 200-230-mesh, 230-270-mesh, 270-mesh 325-mesh, 325-mesh 400-mesh from coarse to fine, correspondingly, the particle size of cubic boron nitride products to be processed into the target particle size is 50-60-mesh, and the larger one particle size is 60-70-mesh).
As another preferred embodiment of the present invention, the target particle size is 50 to 400 mesh.
Preferably, the feed inlet and the discharge outlet of the dry ball milling device in the dry milling have a high gear, a medium gear and a low gear, the feed inlet and the discharge outlet with the grain size of the regrind material of 80-100 meshes are both selected from the high gear (5-kilo-ct material in a hopper completely enters the dry ball milling device (specifically a ball mill) for 5 minutes, the material in the ball milling machine completely exits from the discharge outlet at the high gear and enters the rotary vibration screening device (specifically a rotary vibration screen) for 15 minutes, the material enters and exits simultaneously, the ball milling machine vibrates by virtue of the friction of steel balls, the edges and burrs of the material are worn, one part of the grain size of the regrind material is fine and has a grain size number, the material exits from the ball milling machine and directly enters the rotary vibration screen), and the time of the rotary vibration screen is set to be 20 minutes; the middle gear is selected for the granularity of 100-120 meshes to 140-170 meshes (the blanking time needs 8 minutes, the discharging time needs 20 minutes), and the time of the rotary vibration sieve is set to be 30 minutes; the low gears (the blanking time needs 15 minutes, the discharging time needs 30 minutes) are selected for the 170-plus 200-mesh fine granularity, and the time of the rotary vibration sieve is set to be 50 min.
As another preferred embodiment of the present invention, in the method for shaping cubic boron nitride, the amount of water added is 0.1 to 5 times of the weight of the abrasive back-grinding material, preferably, the abrasive back-grinding material is added at 5 million ct/time, corresponding to wet grinding, 8 million ct of material can be thrown at one time, and the amount of water added is 8 million ct/time.
As another preferred embodiment of the invention, in the shaping method of cubic boron nitride, when the wet grinding is carried out by adding water, the rotation speed of the wet grinding is 20-95r/min, and the time is 20-90 min.
Specifically, the wet milling process comprises the following steps:
1) the cubic boron nitride abrasive grain size is larger than the target grain size by one grain size number, and the process comprises the following steps:
rotating speed: 20-30r/min for 20-30 min.
2) The cubic boron nitride regrind material granularity is larger than the target granularity by two granularity numbers, and the process comprises the following steps:
rotating speed: 30-45r/min and 30-40 min.
3) The cubic boron nitride regrind material granularity is larger than the target granularity by three granularity numbers:
rotating speed: 30-60r/min for 40-65 min.
4) The cubic boron nitride regrind material granularity is larger than the target granularity by four granularity numbers, and the process comprises the following steps:
rotating speed: 60-85r/min, and 50-70 min.
5) The cubic boron nitride abrasive grain size is larger than the target grain size by five grain size numbers by adopting the process:
rotating speed: 70-95r/min for 70-90 min.
As another preferred embodiment of the present invention, in the method for shaping cubic boron nitride, the dry ball mill may be a vibratory ball mill, the rotary vibratory screening device may be a rotary vibratory screen, and the wet grinding device may be a wet grinder; the screen cloth of the rotary vibration screening device comprises two layers of screen cloth which are sequentially arranged, each layer of screen cloth is provided with a discharge port, one discharge port is used for outputting dry-milled materials, the other discharge port is used for outputting materials with the granularity not larger than the target granularity, and specifically, materials (the granularity) at the discharge port at the first layer need to be subjected to wet milling; the second layer is a target particle size (i.e., the desired product particle size) and a fine particle size discharge port, and needs to be transferred to the next process for purification. The rotary vibration screening device sets time according to the granularity section, and after the rotary vibration screening device stops, the discharge port baffle is opened, and then the rotary vibration screening device is opened to discharge materials (until the discharge port does not discharge materials any more).
Further preferably, the method for shaping cubic boron nitride specifically includes the following steps:
1) dry grinding: adding cubic boron nitride which needs to be processed into a target granularity as an abrasive regrind material into a dry ball milling device which is added with steel balls in advance for dry milling to obtain a dry milling material, wherein a discharge port of the dry ball milling device is communicated with a rotary vibration screening device so as to input the dry milling material into the rotary vibration screening device after dry milling, and the size of the abrasive regrind material in the dry milling is larger than the size of the target granularity; preparing steel balls with different sizes according to a proportion, pouring the steel balls into a ball mill, preparing a material receiving barrel at each discharge port, pouring cubic boron nitride which needs to be processed into a target granularity into a hopper of a self-made ball mill (5 kilo ct/time) as abrasive return, adjusting the sizes of the feed port and the discharge port of the ball mill, setting the rotary vibrating screen time, and then sequentially opening a switch of the ball mill, a switch of the rotary vibrating screen and an ultrasonic switch (the abrasive return enters the ball mill from the hopper);
2) wet grinding: in the dry grinding process, the obtained dry grinding material input into the rotary vibration screening device is subjected to wet grinding, specifically, steel balls with different sizes are poured into a wet grinding machine according to the operation process proportion, the weighed dry grinding material is poured into the wet grinding machine and added with water to reach the specified water level (8 kilo ct/time), the process is set according to the requirements, a switch of the wet grinding machine is opened for ball grinding, and then discharging is carried out, so that the finished cubic boron nitride product with the target granularity is obtained.
The shaping method of cubic boron nitride provided by the embodiment of the invention comprises dry grinding and wet grinding operations, and the dry-wet mixing shaping method can improve the labor efficiency, improve the yield of the target granularity, enable the equal-volume shape to be freely mastered, reduce the labor intensity, reduce the dust, optimize the environment, facilitate the industrial production and obviously reduce the production cost.
The embodiment of the invention also provides a cubic boron nitride finished product with the target granularity, which is prepared by adopting the shaping method of the cubic boron nitride.
The embodiment of the invention also provides an application of the cubic boron nitride finished product with the target granularity as cubic boron nitride abrasive particles in grinding tool processing.
As another preferred embodiment of the present invention, in the case where a cubic boron nitride product having a target grain size is obtained as cubic boron nitride abrasive grains by the above-described method, the cubic boron nitride abrasive grains can be used for producing a cubic boron nitride abrasive tool, such as a wire saw or the like.
The embodiment of the invention also provides application of the shaping method of the cubic boron nitride in processing of the grinding material for the grinding tool.
The technical effects of the method for shaping cubic boron nitride according to the present invention will be further described below by referring to specific examples. The method for shaping cubic boron nitride provided by the invention can freely master the equal volume (bulk density) of the product, and in the following examples, the product with the same particle size and high bulk density is called material A; the product with low bulk density is called material B; the method is called as material feeding when the customer does not require the crystal form, and letters are not added after the granularity so as to meet the requirements of the customer; it should be noted that the traditional shaping method produces a lot of material a.
Example 1
A shaping method of cubic boron nitride comprises the following steps:
1) dry grinding: using a 282 variety of cubic boron nitride (CBN 282 for short) which needs to be processed into a target granularity as a regrind material (the shaping target granularity is respectively 100-120 meshes and 120-140 meshes), the granularity is 80-100 meshes and is 30 ten thousand ct in total, then adding the regrind material into a ball mill which is added with steel balls in advance for dry grinding to obtain a dry grinding material, and a discharge port of the ball mill is communicated with a rotary vibration sieve so as to input the dry grinding material into the rotary vibration sieve after the dry grinding; the feed inlet and the discharge outlet of the ball mill in the dry grinding have a high gear, a medium gear and a low gear, the feed inlet and the discharge outlet both select a high gear, the feeding is carried out for 5 kilo ct/time, and the time of the rotary vibration sieve is set to be 20 min;
2) wet grinding: in the dry grinding process, the obtained dry grinding material which is input into the rotary vibration sieve and is coarser than the target particle size is subjected to wet grinding, the rotating speed is 20-30r/min, and the time is 20-30min (the last tank is not enough for 8 million ct, and the time can be shortened according to the actual quantity in proportion); specifically, steel balls with different sizes are mixed according to an operation process and poured into a wet grinder, weighed dry ground materials are poured into the wet grinder, water is added to a specified water level (8 thousands of ct/time of feeding), the process is set according to requirements, a switch of the wet grinder is opened to perform ball milling, and then materials are discharged to obtain a cubic boron nitride finished product with a target particle size.
Example 2
A traditional shaping method of cubic boron nitride is to dry-grind steel balls loaded in a ball-milling tank according to a certain ball-material ratio (generally, the material loaded in each ball-milling tank is 5000-sand 7000 ct/time), put the ball-milled material into a proper sieve, put the material into a vibrating sieve machine to sieve out the required cubic boron nitride product granularity, put the unnecessary coarse-grained product into the ball-milling tank again to continue shaping, and repeat the operation. The same conditions as in example 1 were followed.
Example 3
The shaped products obtained in example 1 and example 2 were subjected to performance tests, and specific results are shown in table 1. The specific detection method adopts GB/T33144-2016, GB/T6406-2016 and JB/T3584-2012. The standard is as follows: GB/T6408-2018 or enterprise Q/ZNJT 01-2018.
Table 1 table of performance test results
As can be seen from the data in table 1, the bulk density of the product obtained by the conventional method in this embodiment does not meet the standard, and the success rate is low. The method of the invention in example 1 has high bulk density and high success rate.
Example 4
A shaping method of cubic boron nitride comprises the following steps:
1) dry grinding: taking a cubic boron nitride 120 variety (CBN 120 for short) with the target granularity to be processed as a regrind material (the reshaping target granularity is respectively 200-230 meshes (material A)), the granularity is 120-140 meshes and is 32-kilo ct in total), then adding the regrind material into a ball mill with a steel ball in advance for dry grinding to obtain a dry grinding material, and a discharge port of the ball mill is communicated with a rotary vibration sieve so as to input the dry grinding material into the rotary vibration sieve after the dry grinding; the feed inlet and the discharge outlet of the ball mill in the dry grinding have high, medium and low gears, the feed inlet and the discharge outlet both select high gears, the feeding is carried out for 8 kilo ct/time, and the time of the rotary vibration sieve is set to be 20 min;
2) wet grinding: in the dry grinding process, the obtained dry grinding material which is input into the rotary vibration sieve and is coarser than the target particle size is subjected to wet grinding, the rotating speed is 60r/min, and the time is 50min (the last tank is not enough for 8 million ct, and the time can be shortened according to the actual quantity in proportion); resetting the rotating speed after the ball milling is finished: 30r/min for 15min (when the target granularity needs A material, the process of each tank is carried out in two stages, namely the first stage is a crushing process, and the second stage is a shaping process, namely two ball milling processes are needed, specifically, one ball milling process is carried out at a rotating speed of 60r/min for 50min, and one ball milling process is carried out at a rotating speed of 30r/min for 15 min). The product with the mixed granularity of 31.2 kilo-ct (loss) is transferred out after the shaping, and a finished product of cubic boron nitride with the target granularity is obtained, wherein the successful material with the target granularity is 9.5 kilo-ct, and the percentage of the successful material with the target granularity is 30.4%.
Example 5
A traditional shaping method of cubic boron nitride is to dry-grind steel balls loaded in a ball-milling tank according to a certain ball-material ratio (generally, the material loaded in each ball-milling tank is 5000-sand 7000 ct/time), put the ball-milled material into a proper sieve, put the material into a vibrating sieve machine to sieve out the required cubic boron nitride product granularity, put the unnecessary coarse-grained product into the ball-milling tank again to continue shaping, and repeat the operation. The same conditions as in example 4 were followed.
Example 6
The shaped products obtained in examples 4 and 5 were subjected to performance tests, and specific results are shown in table 2. The specific detection method adopts GB/T33144-2016, GB/T6406-2016 and JB/T3584-2012. The standard is as follows: GB/T6408-2018 or enterprise Q/ZNJT 01-2018.
TABLE 2 table of Performance test results
As can be seen from the data in table 2, the conventional method in this embodiment is very inefficient. The method in embodiment 3 of the invention has high efficiency.
Example 7
A shaping method of cubic boron nitride comprises the following steps:
1) dry grinding: taking a cubic boron nitride 120 variety (CBN 120 for short) with the target granularity to be processed as a regrind material (the reshaping target granularity is respectively 200-230 meshes (B material)), the granularity is 140-170 meshes and is 32-kilo-ct in total), then adding the regrind material into a ball mill with a steel ball in advance for dry grinding to obtain a dry grinding material, and a discharge port of the ball mill is communicated with a rotary vibration sieve so as to input the dry grinding material into the rotary vibration sieve after the dry grinding; the feed inlet and the discharge outlet of the ball mill in the dry grinding have high, medium and low gears, the feed inlet and the discharge outlet both select high gears, the feeding is carried out for 8 kilo ct/time, and the time of the rotary vibration sieve is set to be 20 min;
2) wet grinding: in the dry grinding process, the obtained dry grinding material which is input into the rotary vibration sieve and is coarser than the target granularity is subjected to wet grinding, the rotating speed is 45r/min, and the time is 40min (when the target granularity needs B material, the process of each tank only needs one stage, the last tank is not enough for 8 million ct, and the time can be shortened according to the actual quantity in proportion); specifically, steel balls with different sizes are mixed according to an operation process and poured into a wet grinder, weighed dry ground materials are poured into the wet grinder, water is added to a specified water level (8 thousands of ct/time of feeding), the process is set according to requirements, a switch of the wet grinder is opened to perform ball milling, and then materials are discharged to obtain a cubic boron nitride finished product with a target particle size. The product with mixed granularity after shaping is 31.5 kilo ct (loss), the successful material with target granularity is 10.7 kilo ct, and the percentage is 33.96 percent
Example 8
A traditional shaping method of cubic boron nitride is to dry-grind steel balls loaded in a ball-milling tank according to a certain ball-material ratio (generally, the material loaded in each ball-milling tank is 5000-sand 7000 ct/time), put the ball-milled material into a proper sieve, put the material into a vibrating sieve machine to sieve out the required cubic boron nitride product granularity, put the unnecessary coarse-grained product into the ball-milling tank again to continue shaping, and repeat the operation. The same conditions as in example 7 were followed.
Example 9
The shaped products obtained in examples 7 and 8 were subjected to performance tests, and specific results are shown in table 3. The specific detection method adopts GB/T33144-2016, GB/T6406-2016 and JB/T3584-2012. The standard is as follows: GB/T6408-2018 or enterprise Q/ZNJT 01-2018.
TABLE 3 table of Performance test results
As can be seen from the data in table 3, the target particle size of the product obtained by the conventional method in this embodiment is larger in material a and smaller in material B. The successful material with the target granularity of the method provided by the embodiment of the invention is 10.7 kilo ct, the proportion is 33.96%, the success rate is high, and the equal volume of the product can be freely mastered.
Example 10
A shaping method of cubic boron nitride comprises the following steps:
1) dry grinding: taking cubic boron nitride which needs to be processed into a target granularity as a regrind material (the shaped target granularity is 60-70 meshes), the granularity is 50-60 meshes and 30-kilo-ct in total, then adding the regrind material into a ball mill which is added with steel balls in advance for dry grinding to obtain a dry grinding material, wherein a discharge hole of the ball mill is communicated with a rotary vibration sieve so as to input the dry grinding material into the rotary vibration sieve after dry grinding; the feed inlet and the discharge outlet of the ball mill in the dry grinding have a high gear, a medium gear and a low gear, the feed inlet and the discharge outlet both select a high gear, the feeding is carried out for 5 kilo ct/time, and the time of the rotary vibration sieve is set to be 20 min; the rotary vibration sieve comprises two layers of screens which are arranged in sequence, each layer of screen is provided with a discharge port, one discharge port is used for outputting dry-milled materials, and the other discharge port is used for outputting materials with the granularity not larger than the target granularity;
2) wet grinding: in the dry grinding process, the obtained dry grinding material which is input into the rotary vibration sieve and is coarser than the target particle size is subjected to wet grinding, the wet grinding rotating speed is 20-30r/min, and the wet grinding time is 20-30min (the last tank is not enough for 8 million ct, and the time can be shortened according to the actual quantity in proportion); specifically, steel balls with different sizes are mixed according to an operation process and poured into a wet grinder, weighed dry grinding materials are poured into the wet grinder, water is added (the adding amount of the water is 0.1 time of the weight of the regrind material) to a specified water level (the feeding amount is 8 ten thousand ct/time), the process is set according to requirements, a switch of the wet grinder is opened for ball milling, and then the materials are discharged, so that a cubic boron nitride finished product with the target granularity is obtained.
Example 11
The process is the same as that of example 10 except that the amount of water added is 0.5 times the weight of the regrind material, compared to example 10.
Example 12
The process is the same as that of example 10 except that the amount of water added is 1 times the weight of the regrind material, compared to example 10.
Example 13
The process is the same as that of example 10 except that the amount of water added is 3 times the weight of the regrind material, compared to example 10.
Example 14
Same as example 10 except that the amount of water added was 5 times the weight of the regrind material as compared with example 10
Example 15
Compared with the embodiment 10, the method is the same as the embodiment 10 except that the target particle size of the shaping is 60-70 meshes, the wet grinding rotating speed is 30-45r/min, and the wet grinding time is 30-40 min.
Example 16
Compared with the embodiment 10, the method is the same as the embodiment 10 except that the target particle size of the shaping is 70-80 meshes, the wet grinding rotating speed is 30-60r/min, and the wet grinding time is 40-65 min.
Example 17
Compared with the embodiment 10, the method is the same as the embodiment 10 except that the target particle size of the shaping is 80-100 meshes, the wet grinding rotating speed is 60-85r/min, and the wet grinding time is 50-70 min.
Example 18
Compared with the embodiment 10, the method is the same as the embodiment 10 except that the target particle size of the shaping is 100-120 meshes, the wet grinding rotating speed is 70-95r/min, and the wet grinding time is 70-90 min.
Example 19
Compared with the embodiment 10, the method is the same as the embodiment 10 except that the particle size of the regrind material is 100-120 meshes, the target particle size of the reshaping is 140-170 meshes, the wet grinding rotating speed is 30-45r/min, and the wet grinding time is 30-40 min.
Example 20
Compared with the embodiment 10, the method is the same as the embodiment 10 except that the particle size of the regrind material is 140-170 meshes, the target particle size of the reshaping is 170-200 meshes, the wet grinding rotating speed is 20-30r/min, and the wet grinding time is 20-30 min.
Example 21
Compared with the embodiment 10, the method is the same as the embodiment 10 except that the particle size of the regrind material is 140-170 meshes, the target particle size of the reshaping is 200-230 meshes, the wet grinding rotating speed is 30-45r/min, and the wet grinding time is 30-40 min.
Example 22
Compared with the embodiment 10, the method is the same as the embodiment 10 except that the particle size of the regrind material is 140-170 meshes, the target particle size of the reshaping is 230-270 meshes, the wet grinding rotating speed is 30-60r/min, and the wet grinding time is 40-65 min.
Example 23
Compared with the embodiment 10, the method is the same as the embodiment 10 except that the particle size of the regrind material is 140-170 meshes, the target particle size of the reshaping is 270-325 meshes, the wet grinding rotating speed is 60-85r/min, and the wet grinding time is 50-70 min.
Example 24
Compared with the embodiment 10, the method is the same as the embodiment 10 except that the particle size of the regrind material is 140-170 meshes, the target particle size of the reshaping is 325-400 meshes, the wet grinding rotating speed is 70-95r/min, and the wet grinding time is 70-90 min.
In the embodiment of the invention, the provided shaping method of cubic boron nitride comprises dry grinding and wet grinding operations, and the dry-wet mixing shaping method can improve the labor efficiency, improve the yield of the target granularity, enable the equal-volume shape to be freely mastered, reduce the labor intensity, reduce the dust, optimize the environment, facilitate the industrial production and obviously reduce the production cost.
Compared with the prior art, the invention has the following beneficial effects:
1. the shaping method of cubic boron nitride provided by the invention obviously improves the success rate of the target granularity of cubic boron nitride, and for the same product, the proportion of the target granularity of the method is 30-50%; the traditional shaping method accounts for 8% -15%.
2. The shaping method provided by the invention has the advantages that the efficiency is obviously improved, for the same product, the method can feed 5 million ct once in dry grinding and 8 million ct once in wet grinding, and the traditional shaping method can feed 3000-.
3. The shaping method of the invention obviously reduces the labor intensity. The discharge port of the dry grinding machine after the shaping is automatically discharged to a rotary vibration sieve; after the traditional shaping method is used for shaping, the ball milling tank needs to be manually moved from the ball mill, the mixed material and the steel balls are poured into a self-made screen, so that the steel balls and the material are separated, and then the target granularity is screened out through a vibrating screen machine.
4. The shaping method can freely master the equal volume shape of the product and meet the requirements of customers; the traditional shaping method produces more A materials.
5. The shaping method of the invention greatly shortens the time and improves the efficiency, the cubic boron nitride abrasive grain size of the method is larger than the target grain size by five grain sizes and only needs 90 minutes at most, while the traditional shaping time is as long as 8 hours.
6. The shaping method of the invention obviously reduces the environmental pollution, adopts a mode of entering and exiting simultaneously during dry grinding, has short ball milling time, basically does not generate dust, and does not generate dust during wet grinding; the longer the ball milling time is, the more fine materials are generated, and the larger the dust is when the powder passes through a screen.
7. The shaping method of the invention obviously reduces the production cost and has wide market prospect.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. The shaping method of the cubic boron nitride is characterized by comprising the operations of dry grinding and wet grinding, and specifically comprises the following steps:
1) dry grinding: adding cubic boron nitride which needs to be processed into a target granularity as a regrind material into a dry ball milling device for dry milling to obtain a dry milling material, wherein a discharge port of the dry ball milling device is communicated with a rotary vibration screening device so as to input the dry milling material into the rotary vibration screening device after the dry milling;
2) wet grinding: and in the dry grinding process, adding the dry grinding material input into the rotary vibration screening device into a wet grinding device, and adding water for wet grinding to obtain a finished cubic boron nitride product with the target granularity.
2. A method for shaping cubic boron nitride according to claim 1, wherein in the method for shaping cubic boron nitride, the size of the regrind grain in the dry grinding is larger than a target size.
3. A method for shaping cubic boron nitride according to claim 1, wherein the target particle size is 50 to 400 mesh.
4. A method for shaping cubic boron nitride as claimed in claim 1, wherein said water is added in an amount of 0.1 to 5 times the weight of said regrind material in said method for shaping cubic boron nitride.
5. A cubic boron nitride shaping method according to claim 1 wherein, in the cubic boron nitride shaping method, the wet grinding is carried out at a rotation speed of 20 to 95r/min for 20 to 90min while adding water for wet grinding.
6. A method for shaping cubic boron nitride according to claim 5, wherein the wet grinding process conditions are selected from any one of the following conditions: wet grinding at a rotation speed of 20-30r/min for 20-30 min; wet grinding rotation speed is 30-45r/min and wet grinding time is 30-40 min; wet grinding rotation speed is 30-60r/min and wet grinding time is 40-65 min; the wet grinding rotation speed is 60-85r/min and the wet grinding time is 50-70 min; or the wet grinding rotation speed is 70-95r/min and the wet grinding time is 70-90 min.
7. A method as claimed in claim 1, wherein the rotary vibration sieve device comprises two layers of screens arranged in sequence, each layer of screen has a discharge port, one of the discharge ports is used for discharging dry-milled material, and the other discharge port is used for discharging material with a particle size not larger than the target particle size.
8. A finished cubic boron nitride product having a target particle size prepared by the method for shaping cubic boron nitride according to any one of claims 1 to 7.
9. Use of a finished cubic boron nitride product of claim 8 having a target particle size in abrasive machining.
10. Use of a method of shaping cubic boron nitride according to any one of claims 1 to 7 in abrasive machining of abrasive articles.
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