Hot pressing sintering device and process for cubic boron nitride cutter

Abstract

The invention relates to the technical field of hot pressing sintering, in particular to a hot pressing sintering device and process for a cubic boron nitride cutter, the hot pressing sintering device comprises a main body, a hearth is arranged in the main body, a lining is arranged in the hearth, and a pressurizing assembly is arranged on the main body and used for pressurizing a cubic boron nitride material. The clamping assembly is arranged on the hearth and used for fixing a cubic boron nitride material needing to be pressurized, and the vibration assembly is arranged at the position, close to the clamping assembly, of the hearth and used for conducting vibration diffusion on the cubic boron nitride material needing to be clamped. The cubic boron nitride material can be stably pressurized while the cubic boron nitride material is vibrated and the density is increased, so that the theoretical density of the pressurized material and the stress of each part of the cubic boron nitride material are uniform, the occurrence rate of air holes is reduced, and the stability of a green body is improved.

Description

Technical Field

[0001] The invention relates to the technical field of hot pressing and sintering, and in particular to a hot pressing and sintering device and process for a cubic boron nitride tool. Background Art

[0002] At present, in the process of making cutting tools from cubic boron nitride materials and binder materials, it is necessary to perform hot pressing and sintering operations on the cubic boron nitride materials and the binder materials during the intermediate process. The existing devices can usually only achieve simple operations of hot pressing and sintering during hot pressing and sintering, which can reduce the occurrence of pores to a certain extent, but there will still be a small number of pores. Therefore, it is necessary to further combine the cubic boron nitride material and the binder material during pressurization to increase the density so that the combined mixed material reaches the ideal density. However, excessive pressure can easily lead to the collapse of the material, and when the temperature is too high, it is easy to cause the device to overload. Therefore, adding a vibration can enable the cubic boron nitride material and the binder to have better mass transfer and combination during pressurization and heating, and increase the density of the mixed material. However, when vibrating, since the graphite column and the mold cannot have an interference fit, the graphite column and the mold need to be vibrated at the same time during vibration to ensure that the mixed material is pressurized stably at all locations and the overall stability of the blank after hot pressing. Summary of the invention

[0003] The purpose of the present invention is to provide a hot pressing sintering device and process for a cubic boron nitride tool, which solves the problem of high pore occurrence rate when the existing hot pressing sintering device performs hot pressing sintering operation on cubic boron nitride materials.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A hot pressing sintering device for a cubic boron nitride tool comprises a main body, a furnace is fixedly provided in the main body, a liner is fixedly provided in the furnace, and further comprises:

[0006] A pressurizing component, which is disposed in the main body and is used to pressurize the cubic boron nitride material;

[0007] A clamping assembly, which is arranged on the furnace and is used to fix the cubic boron nitride material that needs to be pressurized;

[0008] A vibration assembly is arranged on the furnace near the clamping assembly and is used to vibrate and diffuse the cubic boron nitride material that needs to be pressurized.

[0009] Preferably, the clamping assembly includes two piston cylinders respectively fixedly arranged on both sides of the furnace, a piston rod inserted into the lining is slidably provided in the piston cylinder, clamping parts are respectively provided at the opposite ends of the two piston rods, and transmission parts extending out of the piston cylinder are provided at the opposite ends of the two piston rods. A pressure sensor for detecting the pressure in the piston cylinder is fixedly provided in the piston cylinder, one of the clamping parts is provided with a plurality of holes, and the other clamping part is provided with a plug-in that can be inserted into the corresponding holes.

[0010] Preferably, the vibration assembly comprises two transmission cylinders respectively fixedly arranged on both sides of the furnace, a rotating shaft is rotatably arranged in the transmission cylinder, and a striking member capable of contacting the transmission member is arranged on the rotating shaft.

[0011] Preferably, the vibration assembly also includes two water storage parts fixedly arranged inside the lining, the upper part of each of the water storage parts is connected to the side of the corresponding transmission cylinder located in the lining through a steam exhaust part, each side of the transmission cylinder is provided with a steam exhaust pipe connected to the outside world, and each side of the water storage part is provided with a liquid inlet pipe connected to the outside world. A sealing part is hingedly connected at the furnace opening, a sealing gasket is fixedly arranged on the inner side of the sealing part, and a bolt that can be threadedly connected to the furnace is provided on the sealing part.

[0012] Preferably, an impeller located in the transmission cylinder is fixed on the rotating shaft, a fixing piece is fixed in the transmission cylinder, a ventilation groove is provided on the fixing piece on the side away from the exhaust piece inserted into the transmission cylinder, and the rotating shaft is rotatably connected to the fixing piece.

[0013] Preferably, the pressurizing component includes a hydraulic system arranged in the main body, the pressure sensor is electrically connected to the hydraulic system, the opposite ends of the two piston cylinders are connected to the hydraulic system through connecting pipes, hydraulic cylinders are respectively provided on the upper and lower sides of the main body, and the hydraulic cylinders are connected to the hydraulic system through connecting pipes, pressure heads are respectively provided at the opposite ends of the two hydraulic cylinders, insulating sheets are respectively provided at the opposite ends of the two pressure heads, heating elements are respectively provided at the opposite ends of the two insulating sheets, and graphite pressure columns are respectively provided at the opposite ends of the two heating elements.

[0014] Preferably, a graphite plate is placed on the graphite pressure column on the lower side, a mold is placed on the graphite plate, two graphite columns are arranged in the mold, gaskets are arranged at the opposite ends of the two graphite columns, a material to be pressurized is placed between the two gaskets, a graphite sheet is placed inside the mold, and the graphite columns, gaskets and material to be pressurized are all located in the graphite sheet.

[0015] Preferably, a temperature measuring thermocouple is provided on the furnace, an infrared thermometer is provided on the main body, a control cabinet is provided on one side of the main body, the temperature measuring thermocouple and the infrared thermometer are electrically connected to the control cabinet, the pressure sensor and the hydraulic system are electrically connected to the control cabinet, and a plurality of universal wheels are provided on the control cabinet and the lower side of the main body.

[0016] Preferably, a vacuum component is provided in the main body, a water cooling component is provided in the main body, and an inflation tube is provided in the main body.

[0017] A hot pressing sintering process for a cubic boron nitride tool comprises the following specific steps:

[0018] S1. Assemble the pressurized material and the mold, place the assembled mold on the upper end of the pressure head on the lower side, close the seal, and start the vacuum operation;

[0019] S2. Start the hydraulic system to enable the clamp to clamp the mold and the graphite column;

[0020] S3. Start the hydraulic system so that the pressure head pressurizes the material through the graphite pressure column and heats the material through the heating element;

[0021] S4. At the same time, the striking member strikes the transmission member, causing the inside of the mold to vibrate and move the pressurized material;

[0022] S5. After a certain period of pressure sintering, stop heating and extrusion, turn on the water cooling component, and take out the mold after the temperature drops to a certain level.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The striking parts and transmission parts can make the mold and the material vibrate, so that the mass transfer between the materials is more frequent and rapid, the range of movement of the materials is wider, and the activity is higher, so that the combination between the materials is tighter, the probability of pores is reduced, and the density and theoretical density of the materials are increased.

[0025] 2. Through the provided clamps and plug-ins, the mold and the graphite column can be fixed while vibrating, so that the graphite column and the mold vibrate synchronously at the same time, thereby avoiding the unbalanced pressure of the graphite column on various parts of the material during vibration, resulting in instability of the material after pressing, and making the performance of the produced green body more stable.

[0026] 3. The opening diameter of the exhaust part located in the water storage part is larger than the diameter of the inserted transmission cylinder, and the ventilation groove is located away from the steam discharge end of the exhaust part, which is convenient for the impeller to store steam power and drive the impeller to rotate. While increasing the amount of steam entering, it can reduce the diameter of the steam discharge, thereby increasing the steam discharge speed, increasing the impact force of the steam on the impeller, and thus increasing the rotation speed of the impeller.

[0027] 4. Through the arrangement of the exhaust pipe and the liquid inlet pipe, water with a higher temperature can be slowly added to the water storage part through the liquid inlet pipe via an external water supply device, thereby replenishing the evaporation of water in the water storage part and providing continuous power for the rotation of the impeller. The exhaust pipe is used to discharge excess water vapor in the transmission cylinder to the outside, thereby preventing excessive pressure in the transmission cylinder from causing damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0030] Figure 2 It is a schematic diagram of the partial cutaway structure of the present invention.

[0031] Figure 3 It is a structural schematic diagram of the furnace in the present invention.

[0032] Figure 4 It is a schematic diagram of the partial cross-section structure of the furnace and the mold in the present invention.

[0033] Figure 5 It is an exploded view of the clamping assembly in the present invention.

[0034] Figure 6 It is a schematic diagram of the structure of the striking member and the transmission member in the present invention.

[0035] Figure 7 It is a schematic diagram of the striking member striking the transmission member in the present invention.

[0036] Figure 8 It is a schematic cross-sectional structural diagram of the vibration component in the present invention.

[0037] Fig. 9 It is a schematic diagram of the structure inside the fixed cylinder in the present invention.

[0038] Fig.10 It is an exploded view of the interior of the vibration component in the present invention.

[0039] Fig.11 It is a schematic diagram of the parts of the exhaust component in the present invention.

[0040] In the figure: 1. main body; 2. furnace; 201. lining; 202. temperature measuring thermocouple; 203. infrared thermometer; 204. sealing element; 205. sealing gasket; 206. bolt; 3. pressurizing assembly; 301. hydraulic system; 302. hydraulic cylinder; 303. connecting pipe; 304. pressure head; 305. insulating sheet; 306. heating element; 307. graphite pressure column; 308. graphite plate; 309. mold; 310. graphite column; 311. gasket; 312. graphite sheet; 4. clamping assembly; 401. movable Plug cylinder; 402, piston rod; 403, clamping part; 404, transmission part; 405, connecting pipe; 406, socket; 407, plug-in; 408, pressure sensor; 5, vibration component; 501, transmission cylinder; 502, rotating shaft; 503, knocking part; 504, water storage part; 505, exhaust part; 506, exhaust pipe; 507, impeller; 508, fixing part; 509, ventilation groove; 510, liquid inlet pipe; 6, control cabinet; 7, universal wheel; 8, vacuum component; 9, water cooling component; 10, inflation pipe. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0042] Embodiment 1

[0043] At present, in the process of making cutting tools from cubic boron nitride materials and binder materials, it is necessary to perform hot pressing and sintering operations on the cubic boron nitride materials and the binder materials during the intermediate process. The existing devices can usually only achieve simple operations of hot pressing and sintering during hot pressing and sintering, which can reduce the occurrence of pores to a certain extent, but there will still be a small number of pores. Therefore, it is necessary to further combine the cubic boron nitride material and the binder material during pressurization to increase the density so that the combined mixed material reaches the ideal density. However, excessive pressure can easily lead to the collapse of the material, and when the temperature is too high, it is easy to cause the device to overload. Therefore, adding a vibration can enable the cubic boron nitride material and the binder to have better mass transfer and combination during pressurization and heating, and increase the density of the mixed material. However, when vibrating, since the graphite column and the mold cannot have an interference fit, the graphite column and the mold need to be vibrated at the same time during vibration to ensure that the mixed material is stable under pressure everywhere and the overall stability of the embryo after hot pressing is ensured.

[0044] Please refer to the attached drawings of the instruction manual. Figures 1 to 11 The first embodiment of the present invention provides a hot pressing sintering device for a cubic boron nitride tool, comprising a main body 1, a furnace 2 is fixedly provided in the main body 1, a lining 201 is fixedly provided in the furnace 2, a pressurizing component 3, a clamping component 4 and a vibration component 5, the pressurizing component 3 is arranged in the main body 1, and is used to pressurize the cubic boron nitride material, the clamping component 4 is arranged on the furnace 2, and is used to fix the cubic boron nitride material to be pressurized, the vibration component 5 is arranged at a position close to the clamping component 4 on the furnace 2, and is used to vibrate and diffuse the cubic boron nitride material to be pressurized, the clamping component 4 comprises two piston cylinders 401 respectively fixedly provided on both sides of the furnace 2, a piston rod 402 inserted into the lining 201 is slidably provided in the piston cylinder 401, the opposite ends of the two piston rods 402 are respectively provided with clamping members 403, and the opposite ends of the two piston rods 402 are provided with transmission members 40 extending out of the piston cylinder 401. 4. A pressure sensor 408 for detecting the pressure in the piston cylinder 401 is fixedly provided in the piston cylinder 401, a plurality of jacks 406 are provided on one of the clamping members 403, and a plug-in 407 which can be inserted into the corresponding jacks 406 is provided on the other clamping member 403. The vibration assembly 5 includes two transmission cylinders 501 respectively fixedly provided on both sides of the furnace 2, a rotating shaft 502 is rotatably provided in the transmission cylinder 501, and a knocking member 503 which can contact the transmission member 404 is provided on the rotating shaft 502. The vibration assembly 5 also includes two water storage members 504 fixedly provided inside the liner 201, and the upper part of each water storage member 504 is connected to the corresponding side of the transmission cylinder 501 located in the liner 201 through the exhaust member 505, and the diameter of the end of the exhaust member 505 located in the water storage member 504 is larger than the diameter of the end of the exhaust member 505 located in the transmission cylinder 501. For details, please refer to 8 of the accompanying drawings of the specification. Fig.10 and Fig.11As shown, a seal 204 is hingedly connected at the opening of the furnace 2, a sealing gasket 205 is fixedly arranged inside the seal 204, a bolt 206 which can be threadedly connected to the furnace 2 is arranged on the seal 204, an impeller 507 located in the transmission cylinder 501 is fixedly arranged on the rotating shaft 502, the exhaust port of one end of the exhaust part 505 inserted into the transmission cylinder 501 faces the impeller 507, a fixing part 508 is fixedly arranged in the transmission cylinder 501, a plurality of enclosed spaces are formed between the impeller 507, the transmission cylinder 501 and the fixing part 508, a ventilation groove 509 is arranged on the side of the fixing part 508 which is away from the exhaust part 505 inserted into the transmission cylinder 501, and a plurality of The enclosed space can be communicated with the ventilation groove 509, and the diameter of the opening of the exhaust member 505 located at the water storage member 504 is larger than the diameter of the insertion of the transmission cylinder 501. The ventilation groove 509 is located away from the steam discharge end of the exhaust member 505. The steam outlet of the ventilation groove 509 is inclined and inclined toward the position outside the impeller 507. The rotating shaft 502 is rotatably connected to the fixing member 508. The pressurizing component 3 includes a hydraulic system 301 arranged in the main body 1. The pressure sensor 408 and the hydraulic system 301 are electrically connected to the hydraulic system 301. The opposite ends of the two piston cylinders 401 are connected to the hydraulic system 301 through the connecting pipes 405. In the main body 1, hydraulic cylinders 302 are respectively provided on the upper and lower sides, and the hydraulic cylinders 302 are connected to the hydraulic system 301 through a connecting pipe 303. Pressure heads 304 are respectively provided at the opposite ends of the two hydraulic cylinders 302, and insulating sheets 305 are respectively provided at the opposite ends of the two pressure heads 304. Heating elements 306 are respectively provided at the opposite ends of the two insulating sheets 305, and graphite pressure columns 307 are respectively provided at the opposite ends of the two heating elements 306. A graphite plate 308 is placed on the lower graphite pressure column 307, and a mold 309 is placed on the graphite plate 308. Two graphite columns 310 are provided in the mold 309, and gaskets 310 are provided at the opposite ends of the two graphite columns 310. 1, a material to be pressurized is placed between two gaskets 311, a graphite sheet 312 is placed inside the mold 309, a graphite column 310, a gasket 311 and a material to be pressurized are all located inside the graphite sheet 312, a temperature measuring thermocouple 202 is provided on the furnace 2, an infrared thermometer 203 is provided on the main body 1, a control cabinet 6 is provided on one side of the main body 1, the temperature measuring thermocouple 202 and the infrared thermometer 203 are both electrically connected to the control cabinet 6, a pressure sensor 408 is electrically connected to the control cabinet 6, a plurality of universal wheels 7 are provided on the control cabinet 6 and the lower side of the main body 1, a vacuum component 8 is provided inside the main body 1, a water cooling component 9 is provided inside the main body 1, and an inflation tube 10 is provided inside the main body 1.

[0045] During specific use, first place the graphite sheet 312 into the mold 309, then place the lower graphite column 310 into the lowermost side of the mold 309, then place a gasket 311 on the lower graphite column 310, then pour in the cubic boron nitride material and the corresponding binder, then place another gasket 311 on the upper side of the material. The gasket 311 cannot be inserted into the material at an angle, then insert the graphite column 310 on the upper side to complete the installation of the mold 309 and the material.

[0046] Then, the heating element 306 is powered on for heating, and at the same time, the internal part of the furnace 2 is dehumidified by connecting the inflation tube 10 to the inflation system. The inflation system adopts the existing technology, and the gas is an inert gas. The internal moisture is extracted by the vacuum component 8, and then the graphite plate 308 is placed on the lower end of the assembled mold 309, and the graphite plate 308 and the mold 309 are placed on the upper end of the graphite pressure column 307 on the lower side. The mold 309 and the clamping piece 403 are provided with holes. The angle of the mold 309 is adjusted to align the holes on the clamping piece 403 with the holes on the mold 309, and to align the holes on the clamping piece 403 and the mold 309 with the infrared thermometer 203, and the temperature measuring thermocouple 202 is inserted into the holes on the clamping piece 403 and the mold 309 to facilitate the detection of the temperature of the material.

[0047] Rotate the seal 204 to make it contact with the front end of the furnace 2, and then rotate the bolt 206 to make the sealing gasket 205 fully and tightly contact with the furnace 2 to ensure the sealing performance of the furnace 2 and the lining 201, and then start the hydraulic system 301 to input hydraulic oil into the piston cylinder 401 through the connecting pipe 405. The hydraulic oil drives the piston rod 402 and the transmission member 404 to move inward through the piston cylinder 401, and the two piston rods 402 move relative to each other. The two piston rods 402 respectively drive the corresponding clamping members 403 to move inward, and the two clamping members 403 move relative to each other. After the two clamping members 403 move relative to each other for a certain distance, the plug-in 407 on one of the clamping members 403 is inserted into the socket 406 on the other clamping member 403.

[0048] The two clamping members 403 continue to move relative to each other. After the two clamping members 403 move a certain distance again, the two clamping members 403 clamp the mold 309 and the graphite column 310. The pressure inside the piston cylinder 401 is detected by the pressure sensor 408 inside the piston cylinder 401. After the pressure reaches a certain level, it can ensure that when the graphite column 310 and the graphite plate 308 are vibrated, it can ensure that the graphite column 310 and the graphite plate 308 move in the same direction at the same time. The pressure sensor 408 sends a signal to the control cabinet 6, and the control cabinet 6 controls the hydraulic system 301 to stop supplying hydraulic oil to the connecting pipe 405, and stops the movement of the piston rod 402.

[0049] Subsequently, the control cabinet 6 controls the hydraulic system 301 to transmit hydraulic oil power to the upper hydraulic cylinder 302 through the connecting pipe 303, and the lower hydraulic cylinder 302 maintains the same pressure as the upper hydraulic cylinder 302. Various control components and detection components are provided on the hydraulic system 301 and are all prior art, which will not be described in detail herein, and can achieve the above functions. At the same time, the control cabinet 6 starts the heating element 306 to heat the cubic boron nitride material and the binder through the graphite material. In the process, inert gas is filled into the material through the inflation pipe 10 and the external inflation system to protect the material. The temperature of the cubic boron nitride material and the binder material is determined by the temperature measuring thermocouple 202 and the infrared thermometer 203, and the temperature is fed back to the control cabinet 6, so that the temperature rise and fall of the heating element 306 can be controlled by the control cabinet 6, and the density and bonding performance can be increased at the same time. The pressurization operation is performed while heating to realize the hot pressing sintering step.

[0050] As the temperature inside the furnace 2 and the lining 201 increases, the high temperature environment begins to cause the water in the water storage part 504 to boil. After the boiling water evaporates, the steam is discharged into the transmission cylinder 501 through the exhaust part 505. The steam drives the rotating shaft 502 to rotate through the impeller 507. At the same time, a fixing part 508 and a ventilation groove 509 are set. There is no gap between the fixing part 508 and the impeller 507, and there is no gap between the impeller 507 and the transmission cylinder 501. The opening diameter of the exhaust part 505 located in the water storage part 504 is larger than the diameter of the insertion into the transmission cylinder 501. The ventilation groove 509 is located away from the steam discharge end of the exhaust part 505. The steam outlet of the ventilation groove 509 is inclined to ensure the rotation of the impeller 507. The impeller 507 is made of lightweight material. Refer to the attached figure of the specification. Figure 8 , Fig.10 and Fig.11 As shown, it is convenient for the impeller 507 to store steam power and control the rotation direction of the impeller 507, so as to push the impeller 507 to rotate, increase the amount of steam entering, and reduce the diameter of the steam when it is discharged, thereby increasing the steam discharge speed. In addition, there are multiple blades on the outer peripheral surface of the impeller 507, and the exhaust port of the steam exhaust part 505 is inclined toward the blades on the impeller 507, so as to determine the rotation direction of the impeller 507, increase the impact force of the steam on the impeller 507, and thus increase the rotation speed of the impeller 507.

[0051] The impeller 507 drives the striking member 503 to rotate through the rotating shaft 502. The striking member 503 can be elastically deformed after being hit. The striking member 503 strikes the transmission member 404, causing the transmission member 404 to vibrate. The vibration of the transmission member 404 is transmitted to the clamping member 403 through the piston rod 402. The vibration on the clamping member 403 is transmitted to the mold 309 and the graphite column 310. The mold 309 and the graphite column 310 drive the cubic boron nitride material and the binder material to vibrate at the same time. 06, it can ensure that the two clamping parts 403 drive the cubic boron nitride material, the mold 309 and the graphite pressure column 307 to vibrate synchronously, so that there is no relative displacement between the mold 309 and the graphite pressure column 307, and the binder and the cubic boron nitride material will vibrate and displace irregularly, while ensuring the stability of the pressure on the cubic boron nitride material and the binder material, thereby promoting a tighter combination of the cubic boron nitride material and the binder, improving the material to reach the theoretical density, preventing the occurrence of pores, and increasing the fatigue resistance and damage resistance of the embryo.

[0052] After hot pressing and sintering for a certain period of time, heating and pressurizing are stopped. When the blank needs to be taken out, water is first introduced between the liner 201 and the furnace 2 through the water cooling component 9 to reduce the space temperature inside the liner 201. After the temperature drops to a certain level, water is no longer introduced between the liner 201 and the furnace 2, so that the control cabinet 6 controls the hydraulic cylinder 302 to contract, and the material in the mold 309 is no longer heated and pressurized. Then, the vacuum breaking operation is performed. After closing various valves, inert gas is filled into the interior of the liner 201 through the inflation pipe 10 and the external inflation system to complete the vacuum breaking operation.

[0053] Then open the seal 204 and start the hydraulic system 301, so that the hydraulic system 301 sucks the hydraulic oil inside the piston cylinder 401 through the connecting pipe 405, so that the piston rod 402 drives the transmission part 404 to move outward, and the piston rod 402 drives the clamping part 403 to move away from the mold 309, and no longer clamps the mold 309 and the graphite column 310. After the clamping part 403 moves to the initial position, the hydraulic oil in the piston cylinder 401 is no longer sucked, and then the hot-pressed and sintered green body and the mold 309 can be taken out.

[0054] The knocking member 503 and the transmission member 404 can make the mold 309 and the material vibrate, so that the mass transfer between the materials is more frequent and rapid, the range of movement between the materials is wider, and the activity is higher, so that the combination between the materials is tighter, the probability of pores is reduced, and the density of the materials is increased. The clamping member 403 and the plug-in 407 can fix the mold 309 and the graphite column 310 while vibrating, so that the graphite column 310 and the mold 309 can vibrate synchronously at the same time, thereby avoiding the graphite column 310 from vibrating. 0 The pressure at various places of the material is unbalanced, resulting in instability of the material after pressing, making the performance of the produced embryo more stable, and the opening diameter of the exhaust member 505 located in the water storage member 504 is larger than the diameter of the inserted transmission cylinder 501, and the position of the ventilation groove 509 is far away from the steam discharge end of the exhaust member 505, which is convenient for the impeller 507 to store steam power and drive the impeller 507 to rotate. While increasing the amount of steam entering, it can reduce the caliber of the steam when it is discharged, thereby increasing the discharge speed of the steam, increasing the impact force of the steam on the impeller 507, and thus increasing the rotation speed of the impeller 507.

[0055] Embodiment 2

[0056] While the steam drives the impeller 507 to rotate, the water inside the water storage part 504 continuously generates steam, which leads to continuous loss of water. Therefore, the water needs to be replenished so that the vibration in the first embodiment can continue to occur and the material can be continuously vibrated to achieve the purpose of better discharging the pores between the materials.

[0057] On the basis of the above embodiments, in order to solve the above technical problems, referring to the accompanying drawings of the specification Figures 6 to 11 It can be seen that the adopted technical solution includes that the vibration component 5 also includes two water storage parts 504 fixedly arranged on both sides of the lining 201, and the upper part of each water storage part 504 is connected with the corresponding side of the transmission cylinder 501 located in the lining 201 through the exhaust part 505, and each side of the transmission cylinder 501 is provided with an exhaust pipe 506 connected to the outside world, and the direction and position of the exhaust pipe 506 can be conducive to the discharge of water vapor and excess condensed water in the transmission cylinder 501. Without specific restrictions, each water storage part 504 is provided with a liquid inlet pipe 510 connected to the outside world on one side.

[0058] During the evaporation of water, when the steam is discharged into the side of the fixing part 508 away from the impeller 507, the excess steam is discharged to the outside through the exhaust pipe 506 under the action of pressure, so as to prevent the pressure in the transmission cylinder 501 from being too high. When the steam cannot be discharged, the impeller 507 cannot rotate, thereby realizing continuous energy supply to the impeller 507. As the water in the water storage part 504 gradually evaporates into water vapor, it is connected to the external water supply equipment through the liquid inlet pipe 510, such as a water pump connected to the liquid inlet pipe 510. The water supply equipment and its connection method with the liquid inlet pipe 510 are both prior arts and will not be described in detail herein. The water supply equipment continuously and slowly delivers water to the water storage part 504 to ensure that the water volume in the water storage part 504 is sufficient, and the delivered water temperature is relatively high, which is conducive to the rapid evaporation of water in the water storage part 504, and provides a steady stream of steam to drive the impeller 507 to rotate, providing continuous power for the rotation of the impeller 507, and preventing the water in the water storage part 504 from evaporating into steam and being unable to be replenished.

[0059] By setting up the exhaust pipe 506 and the liquid inlet pipe 510, the external water supply equipment can slowly replenish the water with higher temperature into the water storage part 504 through the liquid inlet pipe 510, so as to replenish the amount of water reduced due to evaporation in the water storage part 504, and the exhaust pipe 506 is used to discharge the excess water vapor in the transmission cylinder 501 to the outside, so as to prevent the pressure in the transmission cylinder 501 from being too high and causing damage.

[0060] Embodiment 3

[0061] On the basis of the above embodiment, this embodiment further provides a hot pressing sintering process for a cubic boron nitride tool, including the following specific steps:

[0062] S1. Use the clamp 403 to clamp the mold 309 and the graphite column 310; place the graphite sheet 312, the graphite column 310, the gasket 311 and the graphite column 310 into the mold 309 respectively, complete the installation of the materials, place the assembled mold 309 on the upper end of the lower pressure head 304, close the seal 204, and start the vacuum operation;

[0063] S2. Start the hydraulic system 301, insert the plug 407 into the jack 406, clamp the mold 309 and the graphite column 310, so that the graphite column 310 and the mold 309 can vibrate synchronously;

[0064] S3. The hydraulic system 301 is started through the control cabinet 6, so that the pressure head 304 pressurizes the material through the graphite pressure column 307, and heats the material through the heating element 306;

[0065] S4. At the same time, the water vapor drives the impeller 507 to rotate, and the impeller 507 drives the striking member 503 to rotate through the rotating shaft 502, and the striking member 503 strikes the transmission member 404, and the transmission member 404 drives the clamping member 403 to rotate through the piston rod 402, so that the internal part of the mold 309 vibrates, and the pressurized material vibrates and moves;

[0066] S5. After a certain period of pressure sintering, heating and extrusion are stopped, and the water cooling component 9 is turned on. After the temperature drops to a certain level, the vacuum is broken, and then the sealing member 204 is opened to take out the mold 309.

[0067] The temperature measuring thermocouple 202, infrared thermometer 203, hydraulic system 301, hydraulic cylinder 302, heating element 306, pressure sensor 408, control cabinet 6, vacuum assembly 8 and water cooling assembly 9 and their connection methods in the present invention are all prior arts and will not be described in detail here.

[0068] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hot pressing sintering device for a cubic boron nitride tool, comprising a main body, a furnace fixedly provided in the main body, and a lining fixedly provided in the furnace, characterized in that: Also includes: A pressurizing component, which is disposed in the main body and is used to pressurize the cubic boron nitride material; A clamping assembly, which is arranged on the furnace and is used to fix the cubic boron nitride material that needs to be pressurized; A vibration assembly is arranged on the furnace near the clamping assembly and is used to vibrate and diffuse the cubic boron nitride material that needs to be pressurized.

2. The hot pressing sintering device for cubic boron nitride cutting tools according to claim 1, characterized in that: The clamping assembly includes two piston cylinders fixedly arranged on both sides of the furnace, a piston rod inserted into the lining is slidably provided in the piston cylinder, clamping parts are respectively provided at the opposite ends of the two piston rods, and transmission parts extending out of the piston cylinder are provided at the opposite ends of the two piston rods. A pressure sensor for detecting the pressure in the piston cylinder is fixedly provided in the piston cylinder, one of the clamping parts is provided with a plurality of sockets, and the other clamping part is provided with a plug-in that can be inserted into the corresponding sockets.

3. The hot pressing sintering device for cubic boron nitride cutting tools according to claim 2, characterized in that: The vibration assembly comprises two transmission cylinders respectively fixedly arranged at two sides of the furnace, a rotating shaft is rotatably arranged in the transmission cylinder, and a striking member capable of contacting the transmission member is arranged on the rotating shaft.

4. The hot pressing sintering device for cubic boron nitride cutting tools according to claim 3, characterized in that: The vibration assembly also includes two water storage parts fixedly arranged inside the lining, the upper part of each water storage part is connected to the side of the corresponding transmission cylinder located in the lining through a steam exhaust part, each side of the transmission cylinder is provided with a steam exhaust pipe connected to the outside world, and each side of the water storage part is provided with a liquid inlet pipe connected to the outside world. A sealing part is hingedly connected at the furnace opening, a sealing gasket is fixedly arranged on the inner side of the sealing part, and a bolt that can be threadedly connected to the furnace is provided on the sealing part.

5. The hot pressing sintering device for cubic boron nitride cutting tools according to claim 4, characterized in that: An impeller located in the transmission cylinder is fixedly arranged on the rotating shaft, a fixing piece is fixedly arranged in the transmission cylinder, a ventilation groove is provided on the fixing piece at a side away from the exhaust piece inserted into the transmission cylinder, and the rotating shaft is rotatably connected to the fixing piece.

6. The hot pressing sintering device for cubic boron nitride cutting tools according to claim 4, characterized in that: The pressurizing component includes a hydraulic system arranged in the main body, the pressure sensor is electrically connected to the hydraulic system, the opposite ends of the two piston cylinders are connected to the hydraulic system through connecting pipes, hydraulic cylinders are respectively provided on the upper and lower sides of the main body, and the hydraulic cylinders are connected to the hydraulic system through connecting pipes, pressure heads are respectively provided at the opposite ends of the two hydraulic cylinders, insulating sheets are respectively provided at the opposite ends of the two pressure heads, heating elements are respectively provided at the opposite ends of the two insulating sheets, and graphite pressure columns are respectively provided at the opposite ends of the two heating elements.

7. The hot pressing sintering device for cubic boron nitride cutting tools according to claim 6, characterized in that: A graphite plate is placed on the graphite pressure column on the lower side, a mold is placed on the graphite plate, two graphite columns are arranged in the mold, gaskets are arranged at the opposite ends of the two graphite columns, a material to be pressurized is placed between the two gaskets, a graphite sheet is placed inside the mold, and the graphite columns, gaskets and material to be pressurized are all located in the graphite sheet.

8. The hot pressing sintering device for cubic boron nitride cutting tools according to claim 6, characterized in that: A temperature measuring thermocouple is provided on the furnace, an infrared thermometer is provided on the main body, a control cabinet is provided on one side of the main body, the temperature measuring thermocouple and the infrared thermometer are electrically connected to the control cabinet, the pressure sensor and the hydraulic system are electrically connected to the control cabinet, the heating element is electrically connected to the control cabinet, and a plurality of universal wheels are provided on the control cabinet and the lower side of the main body.

9. The hot pressing sintering device for cubic boron nitride cutting tools according to claim 1, characterized in that: A vacuum component is arranged in the main body, a water cooling component is arranged in the main body, and an air charging pipe is arranged in the main body.

10. A hot pressing sintering process for cubic boron nitride cutting tools, using a hot pressing sintering device for cubic boron nitride cutting tools according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Assemble the pressurized material and the mold, place the assembled mold on the upper end of the pressure head on the lower side, close the seal, and start the vacuum operation; S2. Start the hydraulic system to enable the clamping member to clamp the mold and the graphite column; S3. Start the hydraulic system so that the pressure head pressurizes the material through the graphite pressure column and heats the material through the heating element; S4. At the same time, the striking member strikes the transmission member, causing the inside of the mold to vibrate and move the pressurized material; S5. After a certain period of pressure sintering, stop heating and extrusion, turn on the water cooling component, and take out the mold after the temperature drops to a certain level.

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