Rapid hot pressing equipment and temperature control method

Abstract

The invention relates to rapid hot-pressing equipment and a temperature control method. The rapid hot-pressing equipment comprises a graphite mold and a furnace body, the graphite mold comprises an upper pressing head, a lower pressing head and a mold core, the mold core comprises a mold cavity, the mold cavity is used for containing a sintering material, the upper pressing head and the lower pressing head are slidably arranged at the two ends of the mold cavity in a sleeving mode, the bottom of the upper pressing head and the bottom of the lower pressing head are used for extruding the sintering material, the upper pressing head comprises a first detection channel, and the lower pressing head comprises a second detection channel. The bottom end of the first detection channel is close to the bottom of the upper pressure head; the furnace body comprises a plurality of first heating parts and a temperature detection device, the plurality of first heating parts are arranged at intervals in the circumferential direction of a working area, when the graphite mold is located in the working area, the first heating parts heat the graphite mold, and when the graphite mold is located in the working area, the temperature detection device detects the temperature of the graphite mold. The temperature detection device detects the temperature of the bottom end of the first detection channel. The mold has the effect of accurately controlling the temperature of the material in the mold.

Description

Technical Field

[0001] The present application relates to the technical field of heating furnaces, and in particular to a rapid hot pressing device and a temperature control method. Background Art

[0002] Heating furnaces such as chemical furnaces and hot pressing furnaces are typically used to heat materials to achieve the desired properties or shape. For example, hot pressing furnaces are used to perform hot pressing and sintering on materials such as cemented carbide, ceramic materials, and powder metallurgy under high temperature and vacuum conditions. They can also be hot pressed and sintered under gas protection. Currently, hot pressing furnaces sinter materials by applying heat and pressure to achieve the desired properties or shape. During the hot pressing process, the furnace body heats the working area by heating the furnace cavity, and the heat is then transferred to the mold located in the working area, causing the material inside the mold to be heated and sintered.

[0003] In order to quickly heat up and sinter the material in the mold and improve hot pressing efficiency, the material temperature is usually monitored in real time during sintering to control and adjust it so that it can heat up quickly. The existing detection method is to use a temperature sensor to detect the temperature in the furnace cavity. However, the temperature in the furnace cavity is different from the temperature in the mold, which cannot truly reflect the temperature of the material in the mold. Therefore, it is impossible to accurately control the heating rate of the material in the mold. Summary of the Invention

[0004] In view of this, the present application provides a rapid hot pressing device and a temperature control method to improve the accuracy of temperature control of the material in the mold.

[0005] In a first aspect, the embodiments of the present application provide a rapid hot pressing device, which adopts the following technical solutions: A rapid hot pressing device includes a graphite mold and a furnace body; the graphite mold includes an upper pressure head, a lower pressure head and a mold core, the mold core includes a mold cavity, the mold cavity is used to place sintered material, the upper pressure head and the lower pressure head are slidably mounted on both ends of the mold cavity, the bottom of the upper pressure head and the lower pressure head are used to extrude the sintered material, the upper pressure head includes a first detection channel, the bottom end of the first detection channel is close to the bottom of the upper pressure head; the furnace body includes a plurality of first heating components and a temperature detection device, the plurality of first heating components are arranged at intervals along the circumference of a working area, when the graphite mold is located in the working area, the first heating component heats the graphite mold, and the temperature detection device detects the temperature of the bottom end of the first detection channel.

[0006] Preferably, it also includes a control system, wherein the first heating component includes multiple heating zones distributed from top to bottom, each heating zone includes multiple induction heating coils, and the control system controls the multiple heating zones to start independently or simultaneously according to the detected temperature, and controls each induction heating coil to independently conduct or cut off power to adjust the heating amount.

[0007] Preferably, it includes a pressurizing device, which includes a pressure rod and a second detection channel, one end of the pressure rod passes through the top of the furnace body and is connected to the pressure block, and the pressure block is used to apply pressure to the upper pressure head; the second detection channel runs through the pressure rod and the pressure block, and when the graphite mold is located therein, the first detection channel and the second detection channel are coaxial; the temperature detection device includes an infrared thermometer, and the detection line of the infrared thermometer enters the first detection channel through the second detection channel.

[0008] Preferably, the pressurizing device includes a first sealing mechanism, which includes a sealing seat and a sealing assembly, and the sealing seat is connected to the furnace body; the sealing assembly includes a sealing ring and an anti-loosening part, the inner side surface of the sealing ring abuts the circumferential surface of the pressure rod, and the anti-loosening part is arranged on the outer side surface of the sealing ring and compresses the outer side surface of the sealing ring.

[0009] Preferably, the pressurizing device includes a stroke monitoring mechanism, which includes a scale and an industrial camera. The scale is located above the sealing seat, and the industrial camera is used to capture the position of the scale relative to the sealing seat and send the image to the control system to control the pressure applied by the pressure block to the upper pressure head.

[0010] Preferably, a supporting device is further included, the supporting device including a push rod and a second sealing mechanism, one end of the push rod passes through the bottom of the furnace body and is connected to a support platform, the support platform is used to support the graphite mold; the second sealing mechanism is identical to the first sealing mechanism and is symmetrically arranged; the push rod moves up and down along its axial direction to allow the graphite mold to enter or leave the working area.

[0011] Preferably, it includes an opening and closing mechanism and a furnace door, wherein the furnace door is located on the side of the furnace body, and the opening and closing mechanism includes a first cylinder, a second cylinder and a clamping assembly, wherein the first cylinder is used to drive the furnace door to separate from or contact the furnace body, and the second cylinder is used to drive the clamping assembly to loosen or clamp the furnace door and the furnace body.

[0012] Preferably, it includes a loading and unloading device, which includes a mold base, a sliding base, a first sliding mechanism and a second sliding mechanism. The first sliding mechanism is used to move the mold base toward or away from the furnace body, and the second sliding mechanism is used to move the mold base up and down to place the graphite mold in or take it out of the furnace body.

[0013] Preferably, it includes a fixed frame, which includes a bottom frame, a top frame and multiple columns. The furnace body is located between the multiple columns and connected to the multiple columns. The bottom frame is located below the ground, and the top frame is located above the ground. The two ends of the multiple columns are respectively connected to the bottom frame and the top frame, and the furnace body is located above the ground.

[0014] In a second aspect, an embodiment of the present application provides a temperature control method, which includes the steps of: Preset the sintering temperature and sintering time required for each material; Detect the real-time temperature of graphite mold; Determine whether the real-time temperature is lower than the corresponding sintering temperature; If so, increase the heat generation of the first heat generating component; If not, reduce the heat generation of the first heat generating component.

[0015] Compared with the prior art, the rapid hot pressing equipment and temperature control method provided by the embodiments of the present application have the following beneficial effects: By opening a first detection channel in the upper pressure head, one end of the first detection channel is close to the bottom of the upper pressure head, and the bottom of the upper pressure head is located in the mold cavity and in contact with the sintered material. The temperature detection device obtains a closer material temperature by detecting the temperature of the bottom end of the first detection channel, which is conducive to improving the accuracy of temperature control.

[0016] By dividing the first heating component into multiple heating zones, each heating zone has multiple heating induction coils, and setting a control system to independently control the heating state of each heating zone or each heating induction coil, the control system can accurately adjust the heating amount and achieve high efficiency and energy saving.

[0017] The pressurizing device applies pressure to the upper ram, while the supporting device applies pressure to the lower ram, enabling the material to be sintered under high pressure. The first and second sealing mechanisms seal the furnace body to ensure a stable vacuum environment. The stroke monitoring mechanism monitors the pressure stroke of the pressurizing device and controls the pressure applied to the material.

[0018] The opening and closing of the furnace door is automatically controlled by the opening and closing mechanism, and the furnace door is automatically locked, eliminating the need for manual locking one by one, thereby improving work efficiency.

[0019] The graphite mold is sent into or taken out of the furnace body through the loading and unloading device, eliminating the need for manual handling and improving work efficiency.

[0020] The present application controls the temperature of the hot pressing equipment to avoid excessive heating of the heating components, thereby achieving high efficiency and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an internal schematic diagram of the rapid hot pressing equipment provided in Example 1 of the present application.

[0022] Figure 2 This is a schematic external side view of the rapid hot pressing equipment provided in Example 1 of the present application.

[0023] Figure 3 This is a schematic diagram of the graphite mold provided in Example 1 of the present application located in the working area.

[0024] Figure 4 This is a schematic diagram of the graphite mold provided in Example 1 of the present application.

[0025] Figure 5 This is a partial schematic diagram of the pressurizing device provided in Example 1 of the present application.

[0026] Figure 6 yes Figure 5 Enlarged schematic diagram of point A in the middle.

[0027] Figure 7 yes Figure 5 Enlarged schematic diagram of point B in the middle.

[0028] Figure 8 This is a partial schematic diagram of the support device provided in Example 1 of the present application.

[0029] Figure 9 It is a side view schematic diagram of the pressurizing device provided in Example 1 of the present application.

[0030] Figure 10 This is a top view schematic diagram of the furnace door in the closed state provided in Example 1 of the present application.

[0031] Figure 11 This is a top view schematic diagram of the furnace door in the open state provided in Example 1 of the present application.

[0032] Figure 12 It is a top view schematic diagram of the loading and unloading device provided in Example 1 of the present application.

[0033] Figure 13 It is a side view schematic diagram of the loading and unloading device provided in Example 1 of the present application.

[0034] Figure 14 It is a flow chart of the temperature control method provided in Example 1 of the present application.

[0035] Figure 15 This is a schematic diagram of the upper pressure head provided in Example 2 of the present application.

[0036] Figure 16 It is a flow chart of the temperature control method provided in Example 2 of the present application.

[0037] Explanation of reference numerals: 1. hot pressing furnace; 11. furnace body; 111. working area; 112. feeding area; 12. first heating component; 121. induction heating coil; 122. bracket; 13. wiring structure; 14. furnace door; 15. opening and closing mechanism; 151. first cylinder; 152. connecting rod; 153. movable shaft; 154. movable arm; 16. locking mechanism; 161. second cylinder; 162. clamping block; 163. first slide rail; 164. first slide block; 165. elastic part 17. Interface; 18. Infrared thermometer; 2. Graphite mold; 201. Mold cavity; 202. First detection channel; 21. Upper pressure head; 211. First section; 212. Second section; 213. First split body; 214. Second split body; 22. Lower pressure head; 23. Mold core; 24. Second heating component; 3. Fixing frame; 31. Bottom frame; 32. Top frame; 33. Column; 4. Pressurizing device; 401. Second detection channel; 402. Water channel; 403. First groove; 4 1. First hydraulic mechanism; 42. Pressure rod; 43. First sealing mechanism; 431. Annular base; 432. Annular isolation pad; 433. Annular sealing sleeve; 4331. Water inlet pipe; 4332. Water outlet pipe; 434. Annular top seat; 435. Sealing ring; 436. Anti-loosening member; 437. First spacer; 438. Second spacer; 44. Pressure block; 45. Stroke monitoring mechanism; 451. Scale; 452. Industrial camera; 46. Stroke limit mechanism; 5. Support device; 51 , second hydraulic mechanism; 52, push rod; 53, second sealing mechanism; 54, support platform; 55, insulation structure; 551, first insulating member; 552, second insulating member; 56, second drag chain plate; 6, loading and unloading device; 61, mold base; 611, U-shaped plate; 612, bracket; 62, sliding seat; 621, horizontal base frame; 622, vertical frame; 63, first sliding mechanism; 64, second sliding mechanism; 65, handle; 66, workbench; 7, control system; 8, vacuum system. DETAILED DESCRIPTION

[0038] In order to more clearly understand the purpose, technical solutions and advantages of the present application, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. However, it should be understood by those skilled in the art that the present application can be implemented without these details. In some cases, in order to avoid unnecessary descriptions that make various aspects of the present application obscure, the well-known methods, processes, systems, components and / or circuits that have been described at a higher level will not be described in detail. It is obvious to those skilled in the art that various changes can be made to the embodiments disclosed in the present application, and the general principles defined in the present application can be applied to other embodiments and application scenarios without departing from the principles and scope of the present application. Therefore, the present application is not limited to the embodiments shown, but conforms to the broadest scope consistent with the scope claimed for protection in the present application.

[0039] It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] In the description of this application, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0041] In the description of this application, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any combination in one or more embodiments or examples.

[0042] The present application relates to the field of heating furnaces such as chemical special furnaces and hot pressing furnaces. The hot pressing furnace is used as an example for description below. The embodiment of the present application discloses a rapid hot pressing device.

[0043] Example 1: Please refer to Figures 1 to 3, is a schematic diagram of the rapid hot pressing equipment provided in Example 1 of the present application. The rapid hot pressing equipment includes a hot pressing furnace 1, a graphite mold 2, and a fixed frame 3. The hot pressing furnace 1 includes a furnace body 11. The fixed frame 3 is connected and fixed to the foundation. The furnace body 11 is connected and fixed to the fixed frame 3. A furnace cavity is provided in the furnace body 11. The furnace cavity is divided into upper and lower areas. The upper area is a working area 111 for pressurizing and heating the graphite mold 2. The lower area is a feeding area 112 for placing the graphite mold 2 into the furnace body 11. The graphite mold 2 is at least used to accommodate the material to be sintered and formed.

[0044] like Figure 3 As shown, a plurality of first heating components 12 are provided in the working area 111 of the furnace cavity. The plurality of first heating components 12 are spaced apart along the circumference of the working area 111. When the graphite mold 2 is located in the working area 111, the plurality of first heating components 12 are evenly spaced around the circumference of the graphite mold 2. During operation, the first heating components 12 heat the graphite mold 2, and the graphite mold 2 then transfers the heat to the material inside, causing the material to be heated and sintered. Specifically, the first heating components 12 include a plurality of induction heating coils 121 spaced apart along the axial direction of the furnace body 11. Each induction heating coil 121 is independently mounted on a bracket 122, and the bracket 122 is connected to the furnace body 11. The number of induction heating coils 121 can be increased or decreased accordingly according to the height of the graphite mold 2. Each first heating component 12 can be connected through the wiring structure 13 on the side of the furnace body 11 so as to be connected to an external power source to achieve conductive heating.

[0045] like Figure 4As shown, the graphite mold 2 includes an upper punch 21, a lower punch 22, and a mold core 23. The mold core 23 is cylindrical, with an axial through-hole at its center to form a mold cavity 201. The mold cavity 201 is used to place the material to be sintered, such as metallurgical powder. The lower punch 22 has the same structural dimensions as the upper punch 21 and is symmetrically arranged. The upper punch 21 includes a first section 211 and a second section 212. The second sections 212 of the upper and lower punches 21 and 22 are slidably connected to the mold cavity 201, with the bottom of the second section 212 facing the center of the mold core 23. The upper ram 21 and the lower ram 22 are respectively located at the two axial ends of the mold core 23, so that the two ends of the mold cavity 201 are closed, and the material to be sintered is located between the upper ram 21 and the lower ram 22. The upper ram 21 and the lower ram 22 are configured to be movable up and down along the axis of the mold core 23, thereby changing the space of the mold cavity 201 to accommodate materials of different weights. The bottoms of the upper ram 21 and the lower ram 22 are located in the mold cavity 201 and in contact with the material to be sintered. In order to control the temperature of the working area 111 in the furnace chamber and to manage and adjust the heating conditions of the material, the embodiment of the present application sets a first detection channel 202 in the upper ram 21. The first detection channel 202 is set at the axial center position, with its top end passing through the first section 211 of the upper ram 21 and its bottom end close to the bottom of the second section 212 of the upper ram 21. Since the bottom of the upper pressure head 21 is located in the mold cavity and in contact with the material, the temperature sensing detection device can obtain a close material temperature by detecting the temperature at the bottom of the first detection channel 202, thereby detecting a more realistic heating condition of the material and improving the accuracy of temperature control.

[0046] The rapid hot pressing equipment provided in the embodiment of the present application also includes a control system 7, which includes a heating control unit for controlling the first heating components 12 to start or stop heating. The first heating component 12 can be divided into multiple heating zones from top to bottom, each heating zone containing multiple heating induction coils. In this embodiment, the multiple heating zones include a first heating zone, a second heating zone, and a third heating zone distributed from top to bottom, and each heating zone contains a different number of heating induction coils. The heating control unit is provided with a first control unit for individually controlling each first heating component 12, so that the first heating component 12 can be controlled independently. The first control unit is also provided with multiple first-level control units, each of which corresponds to the multiple heating zones one-to-one and is used to individually control each heating zone. The first-level control unit is also provided with multiple second-level control units, each of which corresponds to the multiple heating induction coils one-to-one and is used to individually control the conductive heating of each heating induction coil. Specifically, each heating zone and each heating induction coil can be numbered, for example, multiple first heating components 12 are numbered 1-1#, 1-2#, 1-3#..., and multiple heating induction coils within the first heating component 12 of 1-1# are numbered 1-11#. 1-12#, 1-13#, etc. The control system 7 independently controls the heating conditions of each heating induction coil, each heating zone, and each heating component according to the number, so as to adjust the heating value of the working area 111 according to actual needs and achieve energy-saving and high-efficiency effects.

[0047] Please refer to Figures 5 to 8 , is a schematic diagram of a pressurizing device 4 and a supporting device 5 provided in an embodiment of the present application. The pressurizing device 4 is used to apply pressure to the upper pressing head 21 of the graphite mold 2, and the supporting device 5 is used to at least support the graphite mold 2 and apply pressure to the lower pressing head 22 to sinter the material under high pressure.

[0048] like Figures 5 to 7As shown, the pressurizing device 4 includes a first hydraulic mechanism 41, a pressure rod 42, a first sealing mechanism 43, and a pressure block 44. One end of the pressure rod 42 passes through the top of the furnace body 11 and is connected to the pressure block 44. The pressure block 44 is located in the furnace cavity and is used to apply pressure to the upper pressure head 21. The other end of the pressure rod 42 is located outside the furnace body 11 and is connected to the first hydraulic mechanism 41. The first hydraulic mechanism 41 drives the pressure rod 42 to move toward the working area 111. After the pressure block 44 contacts the upper pressure head 21 and continues to move, the upper pressure head 21 slides downward in the mold cavity 201 to press the material inside. The pressurizing device 4 also includes a second detection channel 401. The second detection channel 401 runs through both ends of the axis of the pressure block 44 and the pressure rod 42. When the graphite mold is located in the working area 111, the first detection channel 202 is coaxial with the second detection channel 401. In this embodiment, the temperature detection device is an infrared thermometer 18. The infrared detection line of the infrared thermometer 18 passes through the second detection channel 401, enters the first detection channel 202, and reaches the bottom to detect the temperature. Specifically, the infrared thermometer 18 can be connected to the fixed frame 3 and located at the top of the first hydraulic mechanism 41. The first hydraulic mechanism 41 can have a third detection channel (not shown) coaxial with the second detection channel 401. The infrared detection line of the infrared thermometer 18 passes through the third detection channel and the second detection channel 401 in sequence to reach the bottom of the first detection channel 202.

[0049] The embodiment of the present application facilitates installation and wiring by installing an infrared thermometer outside the furnace. The infrared thermometer's detection line passes through the detection channel to the position closest to the material to detect the most realistic material temperature, which helps to improve the accuracy of temperature control.

[0050] The first sealing mechanism 43 includes a sealing seat and a sealing assembly. A first groove 403 is circumferentially provided on the outer side of the sealing seat. A corresponding mounting hole is provided on the top of the furnace body 11. The sealing seat is embedded and connected to the mounting hole of the furnace body 11 through the first groove 403. A sealing assembly is circumferentially provided on the inner side of the sealing seat. The sealing assembly includes a sealing ring 435 and a locking member 436. The inner side surface of the sealing ring 435 abuts the circumferential surface of the pressure rod 42. The locking member 436 is arranged around the outer side of the sealing ring 435 and presses the sealing ring 435 tightly to prevent the sealing ring 435 from loosening. In the embodiment of the present application, there are four sealing rings 435, and they are symmetrically arranged in pairs so that the pressure rod 42 is axially sealed during its up and down movement. The locking member 436 is arranged around the outside of the sealing ring 435 so that the sealing ring 435 is tightly pressed against the circumferential surface of the pressure rod 42, so that the pressure rod 42 is radially sealed. The anti-loosening part 436 is an elastic circular part, for example, it can be a spring ring or an elastic rubber ring. The elastic contraction force can be used to press the sealing ring 435 tightly against the surface of the pressure rod 42 to prevent loosening. The sealing ring 435 is provided with a second groove that is adapted to the anti-loosening part 436, so that the anti-loosening part 436 is positioned through the second groove.

[0051] likeFigure 6 As shown, the sealing seat provided in the embodiment of the present application is in a split form, including an annular base 431 connected to the furnace body 11. A first groove 403 is provided on the outer circumferential surface of the annular base 431, with the notch of the first groove 403 facing outward (the center of the annular base 431 is inward). An annular isolation pad 432 is provided above the annular base 431. The annular isolation pad 432 can be an insulating pad made of an insulating material or a thermal insulation pad made of a heat-insulating material. An annular sealing sleeve 433 is connected above the annular isolation pad 432. The annular sealing sleeve 433 is hollow inside to form a water channel 402. The outside of the annular sealing sleeve 433 is connected to a water inlet pipe 4331 and a water outlet pipe 4332. The water inlet pipe 4331 and the water outlet pipe 4332 are connected to the external cooling water tower and communicate with the water channel 402. When the hot pressing furnace 1 is in operation, heat within the furnace is transferred to the pressure rod 42, and then to the first sealing mechanism 43 through the pressure rod 42. The water channel 402 cools the pressure rod 42 and the first sealing mechanism 43, thereby increasing their service life. The inner side of the annular sealing sleeve 433 is connected to the sealing assembly, and the top of the annular sealing sleeve 433 is connected to the annular top seat 434. A first spacer 437 is provided between the annular top seat 434 and the pressure rod 42, and a second spacer 438 is provided between the annular sealing sleeve 433 and the pressure rod 42. The first and second spacers 437 and 438 have identical structural dimensions and are used to eliminate the gap between the pressure rod 42 and the sealing seat. The sealing seat is designed as a split unit for ease of processing.

[0052] like Figure 8As shown, the support device 5 comprises a second hydraulic mechanism 51, a push rod 52 and a second sealing mechanism 53. One end of the push rod 52 is connected with a support table 54 which is located in the feeding area 112 in the furnace cavity and used for supporting the graphite mold 2, and the other end of the push rod 52 is connected with the second hydraulic mechanism 51. Before work, the graphite mold 2 is placed on the support table 54, and the push rod 52 is driven by the second hydraulic mechanism 51 to move to the working area 111, so that the graphite mold 2 on the support table 54 enters the working area 111. During work, the first hydraulic mechanism 41 drives the pressing block 44 to apply pressure to the upper pressing head 21, and the second hydraulic mechanism 51 synchronously applies pressure to the lower pressing head 22, so that the materials at both ends of the mold cavity 201 are synchronously pressed, thereby improving the uniformity of sintering. The second sealing mechanism 53 is the same as and symmetrically arranged with the first sealing mechanism 43, and is connected with the bottom of the furnace body 11 to seal the gap between the push rod 52 and the bottom of the furnace body 11. An insulation structure 55 is arranged between the push rod 52 and the second hydraulic mechanism 51, and the insulation structure 55 comprises a first insulation piece 551 and a second insulation piece 552. The push rod 52 is connected with a second drag chain plate 56, the first insulation piece 551 is located below the second drag chain plate 56, the second insulation piece 552 is located below the first insulation piece 551, the first insulation piece 551 and the second insulation piece 552 are connected with the second drag chain plate 56 through a screw rod, and the second insulation piece 552 is bolted with the second hydraulic mechanism 51. By arranging the insulation structure 55 between the second hydraulic mechanism 51 and the second drag chain plate 56, the push rod 52 is prevented from conducting electricity, and a certain buffering effect is achieved. The insulation structure 55 comprises two split first insulation pieces 551 and second insulation pieces 552, which facilitates installation.

[0053] The embodiment one of the present application sets the pressing device 4 and the support device 5, and synchronously applies pressure to the upper pressing head 21 and the lower pressing head 22 of the graphite mold 2 through the first hydraulic mechanism 41 and the second hydraulic mechanism 51, thereby improving the uniformity of material sintering. The support device 5 is also used to realize the entry or exit of the graphite mold 2 into or from the working area 111, thereby facilitating the feeding and discharging of the graphite mold 2. The top and bottom of the furnace body 11 are sealed by the second sealing mechanism 53 and the first sealing mechanism 43, thereby ensuring the stability of the vacuum environment. The push rod 52 is prevented from conducting electricity through the insulation structure 55.

[0054] Please refer to Figure 9The pressing device 4 provided by the embodiment of the present application further comprises a stroke monitoring mechanism 45, the stroke monitoring mechanism 45 comprises a scale 451 and an industrial camera 452, the scale 451 can be marked on the circumferential surface of the pressing rod 42 by a stamp, and is located above the sealing seat, the industrial camera 452 can be connected with the fixed frame 3, and the shooting angle thereof faces the scale 451, so that the position of the scale 451 relative to the sealing seat can be shot in real time, and the image is sent to the control system 7. Different materials and different components of the same material require different pressures in sintering work, and the hot pressing furnace 1 provided by the embodiment of the present application can set the standard sintering pressure corresponding to different components of various materials before the materials are sintered, and the stroke of the pressing can be correspondingly output according to the hydraulic parameters of the first hydraulic mechanism 41 and the second hydraulic mechanism 51. For example, before sintering work, the 0 line of the scale 451 is flush with the top surface of the sealing seat, after the sintering work starts, when the pressing is needed, the industrial camera 452 shoots the stroke of the downward movement of the pressing rod 42 in real time, the scale 451 moves downward with the pressing rod 42, and when the scale line corresponding to the required stroke is flush with the top surface of the sealing seat, it is considered that the required pressure is reached, at this time, the control system 7 controls the first hydraulic mechanism 41 to stop pressing in real time according to the picture shot by the industrial camera 452, so that the materials can be sintered under stable pressure. In the embodiment of the present application, the second hydraulic mechanism 51 is the same as the first hydraulic mechanism 41, and is synchronously operated when pressing, so the control system 7 also synchronously monitors the stroke of the second hydraulic mechanism 51. In the embodiment of the present application, the standard sintering pressure can be obtained through multiple simulation sintering work in the laboratory, or can be obtained through multiple actual sintering work, and then is set in the control system 7. In the embodiment of the present application, the pressing device 4 further comprises a stroke limiting mechanism 46, the stroke limiting mechanism comprises an upper limit switch and a lower limit switch, the upper limit switch limits the upward movement position of the pressing rod 42, so as to avoid interference and impact with other components, and the lower limit switch limits the downward stroke of the pressing rod 42, so as to avoid excessive pressing and affect the sintering effect.

[0055] In other embodiments, the scale 451 can be connected to the first drag chain plate (not shown in the figure) of the pressing device 4, and can move up and down with the pressing rod 42.

[0056] Please refer to Figure 10 and Figure 11, is a schematic diagram of the opening and closing of the furnace door provided in the first embodiment of the present application. The hot pressing furnace 1 provided in the embodiment of the present application also includes a furnace door 14, which is located on the side of the furnace body 11. The furnace door 14 is connected to the furnace body 11 through an opening and closing mechanism 15, and the furnace body 11 is closed or opened by the opening and closing mechanism 15 to facilitate the feeding and discharging of the graphite mold 2. The opening and closing mechanism 15 includes a first cylinder 151, a connecting rod 152, a movable shaft 153 and a movable arm 154. The fixed end of the first cylinder 151 is connected to the furnace body 11, and the movable end of the first cylinder 151 is connected to the connecting rod 152. The connecting rod 152 is connected to the movable arm 154 through the movable shaft 153, and the movable arm 154 is connected to the furnace door 14. The first cylinder 151 drives the connecting rod 152 to move by implementing a push-pull motion, and the connecting rod 152 drives the movable shaft 153 to rotate, thereby driving the movable arm 154 to move, thereby realizing the opening or closing of the furnace door 14. In the embodiment of the present application, the hot pressing furnace 1 further includes a locking mechanism 16, which includes two second cylinders 161 and two clamping assemblies. The two second cylinders 161 are respectively located on both sides of the furnace body 11 and are respectively connected to the two clamping assemblies. The clamping assembly includes a clamping block 162, a first slide rail 163 and a first slider 164. The clamping block 162 is connected to the first slide rail 163 through the first slider 164. The first slide rail 163 is connected to the furnace body 11. The clamping block 162 is connected to the movable end of the second cylinder 161. The fixed end of the second cylinder 161 is connected to the furnace body 11. The movable end of the second cylinder 161 moves up and down along the axial direction of the furnace body 11. The second cylinder 161 is located above the furnace door 14. Figure 11 As shown, the clamping block 162 is C-shaped, with its opening facing the center of the furnace body 11. One end of the clamping block 162 is connected to the first slider 164, and the other opposite end is provided with an elastic portion. When connected to the furnace door 14, the elastic portion can contract to facilitate the insertion of the furnace door 14. After connection, the elastic portion clamps the furnace door 14 and the furnace body 11 through elastic force. In the embodiment of the present application, when the furnace door 14 needs to be closed, the first cylinder 151 is first controlled to move so that the furnace door 14 and the furnace body 11 are covered, and then the two second cylinders 161 are controlled to move so that the clamping block 162 moves downward to clamp the furnace door 14 and the furnace body 11. When the furnace door 14 needs to be opened, the two second cylinders 161 are first controlled to move so that the clamping block 162 moves upward to separate from the furnace door 14, and then the first cylinder 151 is controlled to move so that the furnace door 14 and the furnace body 11 are separated. A sealing component is also provided between the furnace door 14 and the furnace body 11 , which may be an inflatable high-temperature resistant sealing strip, to prevent gas from entering through the gap between the furnace door 14 and the furnace body 11 during operation and affecting the vacuum environment.

[0057] In other embodiments, the locking mechanism 16 may be a plurality of vacuum suction cups disposed relative to the furnace body 11 and the furnace door 14. After the furnace door 14 is closed against the furnace body 11, the plurality of vacuum suction cups contact the furnace door 14, and air is extracted from the plurality of vacuum suction cups by the vacuum system 8, causing the plurality of vacuum suction cups to securely hold the furnace door 14, thereby locking the furnace door 14. When the furnace door 14 needs to be opened, air is supplied to the vacuum system 8, separating the vacuum suction cups from the furnace door 14, and the furnace door 14 is then opened by the opening and closing mechanism 15.

[0058] In the embodiment of the present application, the furnace door 14 is automatically opened and closed by the opening and closing mechanism 15 , and the furnace door 14 is locked by the locking mechanism 16 , without manual operation, thereby improving the sintering efficiency.

[0059] Please refer to Figure 12 and Figure 13 , is a schematic diagram of the loading and unloading device provided in Example 1 of the present application. The loading and unloading device 6 includes a mold base 61, a sliding base 62, a first sliding mechanism 63 and a second sliding mechanism 64. The mold base 61 is used to place the graphite mold 2. The sliding base 62 is connected to the first sliding mechanism 63 and the second sliding mechanism 64. The mold base 61 is connected to the second sliding mechanism 64. The first sliding mechanism 63 is used to move the mold base 61 toward or away from the furnace body 11. The second sliding mechanism 64 is used to move the mold base 61 up and down to place the graphite mold 2 into or take it out of the furnace body 11. Figure 12As shown, the mold base 61 includes a U-shaped plate 611 and a bracket 612, the sliding seat 62 includes a horizontal base frame 621 and a vertical frame 622, the second sliding mechanism 64 includes two vertical slide rails and a third cylinder, the two vertical slide rails are connected to the vertical frame 622, the U-shaped plate 611 is connected to the top of the bracket 612, and the back of the bracket 612 is connected to the sliders on the two vertical slide rails, so that the bracket 612 can drive the U-shaped plate 611 to move up and down along the vertical frame 622, the fixed end of the third cylinder is connected to the vertical frame 622, and the movable end of the third cylinder is connected to the bracket 612, and the up and down movement of the bracket 612 is realized by the push-pull action of the third cylinder. The first sliding mechanism 63 includes two horizontal slide rails, which are laid on the ground and extend to the bottom of the furnace body 11 and are connected to the fixed frame 3. The horizontal base frame 621 is connected to the sliders on the two horizontal slide rails, so that the horizontal base frame 621 can move back and forth along the laying direction of the horizontal guide rails. The horizontal base frame 621 is vertically connected to the vertical frame 622. When the horizontal base frame 621 moves, it drives the mold base 61 to move, thereby realizing that the graphite mold 2 on the mold base 61 also moves accordingly. When loading, the graphite mold 2 loaded with material is first placed on the U-shaped plate 611 of the mold base 61. The opening size of the U-shaped plate 611 is larger than the diameter of the mold core 23 but smaller than the diameters of the upper and lower press heads 21 and 22. Therefore, the graphite mold 2 is loaded by inserting the part of the mold core 23 into the opening of the U-shaped plate 611 and hanging it with the U-shaped plate 611 through the upper press head 21. Then, the first sliding mechanism 63 is driven to move the horizontal base frame 621 toward the furnace body 11, thereby driving the vertical frame 622 and the mold base 61 on which the graphite mold 2 is placed to move synchronously toward the furnace body 11. At this time, the furnace door 14 is in the open state, and the horizontal base frame 621 moves until the mold base 61 and the graphite mold 2 enter the feeding area 112 of the furnace cavity, so that the graphite mold 2 is located above the support platform 54. At this time, the second sliding mechanism 64 is driven to drive the mold base 61 to move downward. During the downward movement, the graphite mold 2 falls on the support platform 54 and is supported by the support platform 54, and the U-shaped plate 611 of the mold base 61 continues to move downward to the mold core 23 and then separates from the graphite mold 2. Then the first sliding mechanism 63 is driven to move the horizontal base frame 621 away from the furnace body 11, and the mold base 61 leaves the furnace body 11 to complete the unloading work. In the embodiment of the present application, a handle 65 and a workbench 66 are further connected to the horizontal base frame 621. An operator can push the horizontal base frame 621 back and forth using the handle 65, visually observe the positional correspondence between the graphite mold 2 and the support platform 54, and then control the operation of the second slide mechanism 64 using the workbench 66. In other embodiments, the horizontal base frame 621 can be moved along the horizontal guide rail by a motor.

[0060] In an embodiment of the present application, a gravity sensor can also be installed on the mold base 61 to identify the loading and unloading status of the graphite mold 2. When loading, the graphite mold 2 is hung on the U-shaped plate 611. The gravity sensor senses the weight, which is considered to be loading completed, and then drives the first sliding mechanism 63 to move toward the furnace body 11. After the graphite mold 2 is placed on the support platform 54 and supported by the support platform 54, the gravity sensor no longer senses the weight, which is considered to be the graphite mold 2 has been unloaded, and then drives the first sliding mechanism 63 to run in the opposite direction, without manual identification, thereby improving efficiency. In an embodiment of the present application, the distance that the first sliding mechanism 63 needs to slide can be designed based on the straight-line distance from the center of the furnace body 11 to the center of the U-shaped plate 611. When feeding, the first sliding mechanism 63 is driven to move the corresponding distance so that the center position of the graphite mold 2 automatically corresponds to the center of the support platform 54 after entering the furnace cavity. In other embodiments, a sensor switch can be set on the support platform 54 and the lower pressure head 22 to identify the placement of the graphite mold 2 through the sensor switch.

[0061] In the embodiment of the present application, the first sliding mechanism 63 and the second sliding mechanism 64 are in the form of slide rails and sliders. In other embodiments, they can be in the form of ball screws and screw nuts, or in the form of guide rods and slide seats.

[0062] The embodiment of the present application provides a rapid hot pressing device, which can also be provided with a cooling system (not shown in the figure). The cooling system includes a plurality of air inlets and air outlets arranged in the feeding area 112. The air inlet can be connected to an external refrigeration device to transport cooling gas to the feeding area 112 to cool the sintered graphite mold 2. The air outlet can be connected to an external exhaust fan to extract the gas after the internal heat exchange.

[0063] Multiple interfaces 17 can be provided at different positions of the furnace body 11. The multiple interfaces 17 can be connected to equipment or structures outside the furnace body 11 to achieve different functions. For example, they can be used as exhaust ports to connect to the vacuum system 8, or as wiring ports for component wiring, or for installing light sources, or as air inlets and outlets, etc. Idle interfaces 17 can be sealed with plugs.

[0064] The rapid hot pressing equipment provided in the embodiment of the present application can be a large hot pressing furnace, the total height of which is not less than 5 meters, and the height of the graphite mold 2 is not less than 1 meter. In order to reduce the occupied space, the rapid hot pressing equipment provided in the embodiment of the present application is partially buried underground. Figure 1 and Figure 2As shown, the fixed frame 3 includes a bottom frame 31, a top frame 32, and multiple columns 33. The bottom frame 31 is located below ground level, and the hot press furnace 1 is located between the top and bottom frames 32 and 31. The hot press furnace 1 is located above ground level. The second hydraulic mechanism 51 is connected to the bottom frame 31 and is located below ground level. The first hydraulic mechanism 41 is connected to the top frame 32. The bottom of the furnace body 11 is connected to the multiple columns 33 via supports for securement. The vacuum system 8 and control system 7 are located above ground level. By placing some of the equipment's frames below ground level, the space occupied above ground is reduced, making it easier for technicians to operate and reducing overhead work.

[0065] The rapid hot pressing equipment provided in the embodiment of the present application has the following working steps: Open the upper pressure head of the graphite mold, place the material to be sintered into the mold cavity, and then insert the upper pressure head so that the material to be sintered is located between the upper and lower pressure heads; Place the graphite mold with the sintered material on the mold base of the loading and unloading device, and connect it to the upper pressure head through the U-shaped plate; Open the furnace door, drive the first sliding mechanism to slide according to the set distance, move the mold base toward the furnace body and into the furnace cavity, move the graphite mold to be located above the support platform, and make the center of the graphite mold correspond to the center position of the support platform; The second sliding mechanism is driven to move the mold base downward, and the graphite mold falls on the support table and is supported by the support table. The mold base is separated from the graphite mold, and the first sliding mechanism is driven to run in the reverse direction to make the mold base leave the furnace body; Control the second hydraulic mechanism to start and transport the graphite mold to the working area; Close the furnace door and extract the gas in the furnace chamber through the vacuum system; turn on the first heating component, and at the same time control the first hydraulic mechanism and the second hydraulic mechanism to operate synchronously to apply pressure to the upper and lower pressure heads to start sintering; The sintering temperature and sintering time are adjusted in real time according to the detected temperature. After the set sintering time is completed, the first hydraulic mechanism is reset, and the second hydraulic mechanism drives the graphite mold to reset, so that the graphite mold leaves the working area and returns to the feeding area; Start the cooling system to cool down the graphite mold in the feeding area; After the set cooling time is completed, the furnace door is opened, and the first sliding mechanism is driven to slide according to the set distance, so that the mold seat moves toward the furnace body and enters the furnace cavity, and the graphite mold is clamped into the U-shaped plate. The second sliding mechanism is driven to move upward to make the graphite mold leave the support table, and then the first sliding mechanism is driven to move in the opposite direction, so that the mold seat carries the graphite mold out of the furnace body; The sintered material is demoulded.

[0066] Please refer to Figure 14, is a flow chart of the temperature control method provided in Example 1 of the present application. The hot pressing furnace sintering different materials requires different temperatures and sintering times. The present application also provides a temperature control method, which includes the following steps: S101: Preset the sintering temperature and sintering time required for each material.

[0067] The temperature control method provided in this application uses a control system to pre-set the sintering temperature and sintering time corresponding to various materials to control the material forming process. Before the sintering process begins, the operator enters the sintering material into the control system, which automatically displays the required sintering temperature and sintering time for the material.

[0068] S102: Detecting the real-time temperature of the graphite mold.

[0069] During sintering, the control system obtains the real-time temperature inside the graphite mold through an infrared thermometer. Specifically, the real-time temperature of the graphite mold can be detected after the sintering work is started for a period of time and reaches a stable state.

[0070] S103: Determine whether the real-time temperature is lower than the corresponding sintering temperature.

[0071] The real-time temperature is compared with the sintering temperature required for the same material stored in the system, and the heating value of the first heating component is adjusted based on the comparison result. If the real-time temperature is close to or equal to the corresponding sintering temperature, the current heating value is maintained. If the real-time temperature is lower than the corresponding sintering temperature by a certain range, step S104 is executed. If the real-time temperature is higher than the corresponding sintering temperature, step S105 is executed.

[0072] S104: Increase the heat generation of the first heat generating component.

[0073] In step S104, since the real-time temperature is lower than the required sintering temperature, the temperature inside the graphite mold has not yet met the sintering temperature required by the material. The heating value of the first heating component can be increased to increase the temperature of the graphite mold, and the temperature of the graphite mold is continuously detected to calculate the new real-time temperature.

[0074] Specifically, the step of increasing the heat generation of the first heat generating component includes: The control system determines whether all heating zones in the first heating component have been activated; If there is a heating zone that has not been activated, control its activation; If all heating zones have been activated, further determine whether all induction heating coils are conducting and heating; If there is an induction heating coil that is not conducting heat, control its conducting heat; If all induction heating coils are conductive, extend the sintering time.

[0075] In the case that all induction heating rings are in the conductive heating state, but the real-time temperature of the graphite mold is still lower than the required sintering temperature, the sintering time can be extended to ensure that the material is fully sintered. At this time, the control system can update the stored corresponding sintering time.

[0076] S105: Reduce the heat generation of the first heating component.

[0077] In step S105, since the temperature in the graphite mold is higher than the required sintering temperature of the material, the heat generation of the first heating component needs to be reduced. At this time, the control system can control the power supply of some induction heating rings according to the number to reduce the heat generation of the first heating component.

[0078] Specifically, for different components of the same material, the required sintering time is different, so the component of the material can be input before the sintering starts to obtain the corresponding sintering time stored in the system. In the embodiment of the application, the sintering temperature and sintering time corresponding to various materials and different components can be obtained through multiple simulation sintering work in the laboratory, or can be obtained through multiple actual sintering work, and then set in the control system.

[0079] Specifically, in order to quickly heat the hot-pressing furnace, all induction heating rings in the first heating component can be completely conductive heating at the beginning of the sintering work, and then the heat generation is adjusted according to the real-time temperature when the temperature of the graphite mold reaches the required sintering temperature.

[0080] Embodiment two: please refer to Figure 15 is a schematic view of the upper pressing head provided in the embodiment two of the application. The difference between the embodiment two and the embodiment one is that the upper pressing head 21 and the lower pressing head 22 are both provided with a second heating component 24, which can heat the upper pressing head 21 and the lower pressing head 22 during work, so that the materials at both ends in the mold cavity 201 are heated. The second heating component 24 can be a plurality of heating bodies arranged along the circumference of the pressing head, which are located inside the pressing head and close to the bottom of the second section 212. The heating body can be an induction coil, a graphite heating body, an electrode, etc. The second heating component 24 can also be connected with the external power supply through the wiring structure 13 on the side of the furnace body 11 to realize conductive heating. During sintering, the graphite mold can be connected with the wiring structure 13 after entering the working area of the furnace body, and then the furnace door is closed to start the sintering work. In the embodiment, the second section 212 of the upper pressing head 21 is split type, including a first split body 213 and a second split body 214, which are provided with installation grooves for placing the heating bodies. After the heating bodies are placed in the installation grooves, the first split body 213 and the second split body 214 are connected through the clamping structure, and then the high-temperature graphite glue is filled into the gap.

[0081] In some other embodiments, the second heat-generating component can be a heat-generating wire wound around the outer side of the upper pressing head.

[0082] In the second embodiment of the present application, the second heat-generating component 24 is arranged in the upper pressing head 21 and the lower pressing head 22, and in combination with the plurality of first heat-generating components 12 arranged at intervals in the working area 111 of the furnace body 11, the two ends and the circumferential side of the graphite mold 2 are heated, so that the graphite mold 2 and the internal material are rapidly heated and the internal material is uniformly heated.

[0083] In the second embodiment of the present application, the working area 111 in the furnace cavity is also provided with a temperature sensing element to detect the temperature of the working area 111. The infrared temperature measuring instrument and the temperature sensing element are connected with the control system 7 to feed back the detected temperature data to the control system 7. The temperature sensing element can be a thermocouple or a temperature sensor. The temperature of the graphite mold is detected by the temperature sensing element in the working area 111 and the infrared temperature measuring instrument, and the heating amount of the first heat-generating component 12 and the second heat-generating component 24 is controlled in real time by the control system 7, so that the material sintering process is kept uniform. The control system 7 includes a second control unit for independently controlling the second heat-generating component 24 and each heat-generating body contained therein. The temperature sensing element can be extended outside the furnace body through the interface 17.

[0084] Please refer to Figure 16 is a temperature control method flowchart provided by the second embodiment of the present application, which includes the following steps: S301: preset the sintering temperature and sintering time required by each material.

[0085] S302: preset the standard temperature difference range of the working area temperature and the graphite mold temperature during sintering of each material.

[0086] The temperature control method provided by the present application presets the sintering temperature and sintering time corresponding to various materials by the control system, and sets the standard temperature difference range of the working area temperature and the graphite mold temperature corresponding to different materials. The sintering temperature and sintering time are used to control the material forming, and the standard temperature difference range is used to control the material heating uniformity. Before the sintering work starts, the operator inputs the sintering material in the control system, and the control system automatically displays the required sintering temperature and sintering time of the material, as well as the standard temperature difference range of the working area and the graphite mold in the stable state.

[0087] S303: real-time detection of the working area temperature and the graphite mold temperature, and calculation of the real-time temperature difference.

[0088] During sintering work, the control system obtains the real-time temperature in the graphite mold by the infrared temperature measuring instrument and obtains the real-time temperature of the working area by the temperature sensing element, and calculates the real-time temperature difference between the two.

[0089] S304: judging whether the real-time temperature difference is within the corresponding standard temperature difference range.

[0090] The real-time temperature difference is compared with the standard temperature difference range of the same material stored in the system memory, and the working area and / or the heat generation of the graphite mold are adjusted according to the comparison result to make the material evenly heated. If the real-time temperature difference is within the corresponding standard temperature difference range of the same material, the current heat generation is kept unchanged; if the real-time temperature difference is not within the corresponding standard temperature difference range, step S305 is performed.

[0091] S305: judging whether the temperature of the graphite mold reaches the required sintering temperature.

[0092] In step S305, it is judged whether the real-time temperature of the graphite mold reaches the required sintering temperature preset by the system, and in the case that the real-time temperature of the graphite mold does not reach the required sintering temperature, step S306 is performed, and the real-time temperature difference is continuously detected; in the case that the real-time temperature of the graphite mold reaches the required sintering temperature, step S307 is performed.

[0093] S306: increasing the heat generation of the first heating component and / or the second heating component.

[0094] In step S306, since the real-time temperature difference is not within the standard temperature difference range, and the temperature in the graphite mold does not meet the required sintering temperature of the material, at this time, it is considered that the temperature of the graphite mold is too low, and the heat generation of the first heating component and / or the second heating component can be increased to increase the temperature of the graphite mold, and the temperature of the working area and the temperature of the graphite mold are continuously detected to calculate a new real-time temperature difference.

[0095] Specifically, the step of increasing the heat generation of the first heating component and / or the second heating component includes: It is judged whether all the heating bodies in the second heating component are in conduction, and if there is a heating body not in conduction, the heating body is controlled to be in conduction to increase the temperature of the graphite mold; in the case that the second heating component is completely in conduction, and the temperature of the graphite mold does not reach the required sintering temperature, the heat generation of the first heating component is increased to increase the temperature in the graphite mold by the first heating component.

[0096] The heat generation of the first heating component and / or the second heating component is increased to make the temperature of the graphite mold reach the required sintering temperature, and then a new real-time temperature difference is calculated by continuous detection, and the heat generation of the first heating component and / or the second heating component is continuously adjusted to make the real-time temperature difference within the standard temperature difference range, and if necessary, the sintering time is prolonged to ensure sufficient sintering of the material.

[0097] S307: judging whether the temperature of the working area is less than the temperature of the graphite mold.

[0098] In step S307, the temperature inside the graphite mold has reached or is close to the sintering temperature required by the material, but the real-time temperature difference is not within the standard temperature difference range. It is considered that the temperature of the working area is too low or too high, which will affect the heating of both sides of the material and cause uneven heating of the material. Therefore, it is determined whether the real-time temperature of the working area is lower than the real-time temperature of the graphite mold. If it is greater than or equal to the real-time temperature of the graphite mold, step S308 is executed; if it is lower than the real-time temperature of the graphite mold, step S309 is executed.

[0099] S308: Reduce the heat generated by the first heat-generating component.

[0100] In step S308, because the temperature inside the graphite mold has reached or is close to the material's required sintering temperature, and the temperature in the working area is greater than or equal to the temperature of the graphite mold, the heating element's heat output needs to be reduced to minimize the real-time temperature difference and ensure uniform heating of the material. At this point, the control system can de-energize some of the induction heating coils according to their number to reduce the heating element's heat output.

[0101] S309: Increase the heating value of the first heating component.

[0102] In step S309, since the temperature of the working area is lower than that of the graphite mold, the temperature of the working area needs to be increased to reduce the real-time temperature difference. At this time, the conductivity of each induction heating coil of the first heating component can be detected. If there is an induction heating coil that is not yet conductive, it is conductively heated to increase the temperature of the working area. If all the induction heating coils of the first heating component are conductive, some or all of the heating elements of the second heating component in the graphite mold are controlled to be powered off and stop heating, so that the real-time temperature difference reaches the threshold range of the standard temperature difference and ensures the uniformity of material heating. Since the temperature of the graphite mold has dropped and no longer reaches the sintering temperature required by the material, the sintering time can be extended to ensure that the material is fully sintered.

[0103] Specifically, different weights of the same material may require different sintering times. Therefore, before sintering begins, the weight of the material can be input to obtain the corresponding sintering time pre-stored in the system. In the embodiment of the present application, the sintering temperature and sintering time corresponding to various materials, as well as the standard temperature difference between the working area temperature and the graphite mold temperature corresponding to different materials, can be obtained through multiple simulated sintering operations in the laboratory, or through multiple actual sintering operations, and then set in the control system.

[0104] Specifically, in order to quickly heat up the hot pressing furnace and the graphite mold, all the heating elements in the first heating component and the second heating component can be fully conductively heated at the beginning of the sintering work. When the temperature of the graphite mold reaches the required sintering temperature, the real-time temperature difference is compared with the standard temperature difference range, and the heating value is adjusted according to the comparison results to ensure that the material is heated evenly.

[0105] It should be understood that although the steps in the flowcharts of the accompanying drawings are shown in sequence as indicated by the arrows, these steps are not necessarily performed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps and they may be performed in other orders.

[0106] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A rapid hot pressing device, characterized in that: It includes a graphite mold (2) and a furnace body (11); The graphite mold (2) includes an upper pressing head (21), a lower pressing head (22) and a mold core (23), the mold core (23) includes a mold cavity (201), the mold cavity (201) is used to place the sintering material, the upper pressing head (21) and the lower pressing head (22) are slidably mounted on both ends of the mold cavity (201), the bottoms of the upper pressing head (21) and the lower pressing head (22) are used to extrude the sintering material, the upper pressing head (21) includes a first detection channel (202), and the bottom end of the first detection channel (202) is close to the bottom of the upper pressing head (21); The furnace body (11) comprises a plurality of first heating components (12) and a temperature detection device, wherein the plurality of first heating components (12) are arranged at intervals along the circumference of a working area (111); when the graphite mold (2) is located in the working area (111), the first heating components (12) heat the graphite mold (2), and the temperature detection device detects the temperature of the first detection channel (202).

2. The rapid hot pressing equipment according to claim 1, characterized in that: The invention also includes a control system (7), wherein the first heating component (12) includes a plurality of heating zones distributed from top to bottom, each heating zone includes a plurality of induction heating coils (121), and the control system (7) controls the plurality of heating zones to start independently or simultaneously according to the detected temperature, and controls each of the induction heating coils (121) to independently conduct or cut off power to adjust the heat generation.

3. The rapid hot pressing equipment according to claim 1, characterized in that: The invention comprises a pressurizing device (4), wherein the pressurizing device (4) comprises a pressure rod (42) and a second detection channel (401), wherein one end of the pressure rod (42) passes through the top of the furnace body (11) and is connected to a pressure block (44), and the pressure block (44) is used to apply pressure to the upper pressure head (21); the second detection channel (401) passes through the pressure rod (42) and the pressure block (44), and when the graphite mold (2) is located in the working area (111), the first detection channel (202) and the second detection channel (401) are coaxial; and the temperature detection device comprises an infrared thermometer, and a detection line of the infrared thermometer enters the first detection channel (202) through the second detection channel (401).

4. The rapid hot pressing equipment according to claim 3, characterized in that: The pressurizing device (4) includes a first sealing mechanism (43), the first sealing mechanism (43) includes a sealing seat and a sealing assembly, the sealing seat is connected to the furnace body (11); the sealing assembly includes a sealing ring (435) and an anti-loosening member (436), the inner side surface of the sealing ring (435) abuts against the circumferential surface of the pressure rod (42), and the anti-loosening member (436) is arranged on the outer side surface of the sealing ring (435) and compresses the outer side surface of the sealing ring (435).

5. The rapid hot pressing equipment according to claim 4, characterized in that: The pressurizing device (4) includes a stroke monitoring mechanism (45), and the stroke monitoring mechanism (45) includes a scale (451) and an industrial camera (452). The scale (451) is located above the sealing seat, and the industrial camera (452) is used to photograph the position of the scale (451) relative to the sealing seat and send the image to the control system (7) to control the pressure applied by the pressing block (44) to the upper pressure head (21).

6. The rapid hot pressing equipment according to claim 4, characterized in that: The invention also includes a supporting device (5), wherein the supporting device (5) includes a push rod (52) and a second sealing mechanism (53), wherein one end of the push rod (52) passes through the bottom of the furnace body (11) and is connected to a support platform (54), and the support platform (54) is used to support the graphite mold (2); the second sealing mechanism (53) is identical to the first sealing mechanism (43) and is symmetrically arranged; the push rod (52) moves up and down along its axial direction to allow the graphite mold (2) to enter or leave the working area (111).

7. The rapid hot pressing equipment according to claim 1, characterized in that: The invention comprises an opening and closing mechanism (15) and a furnace door (14), wherein the furnace door (14) is located on the side of the furnace body (11), and the opening and closing mechanism (15) comprises a first cylinder (151), a second cylinder (161) and a clamping assembly, wherein the first cylinder (151) is used to drive the furnace door (14) to separate from or contact the furnace body (11), and the second cylinder (161) is used to drive the clamping assembly to loosen or clamp the furnace door (14) and the furnace body (11).

8. The rapid hot pressing equipment according to claim 1, characterized in that: The invention comprises a loading and unloading device (6), wherein the loading and unloading device (6) comprises a mold base (61), a sliding base (62), a first sliding mechanism (63) and a second sliding mechanism (64), wherein the first sliding mechanism (63) is used to move the mold base (61) toward or away from the furnace body (11), and the second sliding mechanism (64) is used to move the mold base (61) up and down to place the graphite mold (2) in or take it out of the furnace body (11).

9. The rapid hot pressing equipment according to claim 1, characterized in that: The furnace body (11) comprises a fixed frame (3), wherein the fixed frame (3) comprises a bottom frame (31), a top frame (32) and a plurality of upright columns (33); the furnace body (11) is located between the plurality of upright columns (33) and is connected to the plurality of upright columns (33); the bottom frame (31) is located below the ground; the top frame (32) is located above the ground; two ends of the plurality of upright columns (33) are respectively connected to the bottom frame (31) and the top frame (32); and the furnace body (11) is located above the ground.

10. A temperature control method, applied to the rapid hot pressing equipment according to any one of claims 1 to 9, characterized in that: Including steps: Preset the sintering temperature and sintering time required for each material; Detect the real-time temperature of graphite mold; Determine whether the real-time temperature is lower than the corresponding sintering temperature; If so, increase the heat generation of the first heat generating component; If not, reduce the heat generation of the first heat generating component.

Images