An apparatus and process for sintering cemented carbide

Abstract

This invention discloses an apparatus and process for sintering cemented carbide, relating to the field of cemented carbide sintering technology. The apparatus includes a sintering furnace body, a clamping rotating component at the output end of a telescopic cylinder, and a locking interlock component on the side of the movable block away from the outer connecting ring. By incorporating the clamping rotating component, when the telescopic cylinder is activated, the pushing plate presses down on one end of the inclined frame during extension, thereby clamping and fixing the sintered workpiece with the support plate. Once the support plate has clamped and limited the workpiece, the telescopic cylinder continues to extend. At this time, the moving transmission spur gear of the connecting frame rotates along the positioning rack, causing the workpiece to rotate 180 degrees. When the telescopic cylinder returns to its original position, the support plate is pulled back by the pushing plate, ensuring that the surface of the sintered workpiece is in full contact with the inert gas, thus improving the uniformity of heat dissipation and enhancing the quality of the finished product.

Description

Technical Field

[0001] This invention relates to the field of cemented carbide sintering technology, specifically to an apparatus and process for cemented carbide sintering. Background Technology

[0002] A vacuum sintering furnace is a furnace that performs protective sintering of heated items in a vacuum environment. There are many heating methods, such as resistance heating, induction heating, and microwave heating. Furnaces that use induction heating to perform protective sintering of heated items utilize the principle of medium-frequency induction heating to sinter cemented carbide cutting tools and various metal powder pressed bodies.

[0003] After the cemented carbide powder product is sintered, the inside of the sintering furnace and the cemented carbide sintered body need to be cooled. At this time, external inert gas needs to be introduced into the sintering furnace. Then, the inert gas with heat is discharged from the sintering furnace by absorbing the inert gas, thereby achieving the cooling treatment of the cemented carbide sintered body and the inside of the sintering furnace. However, since the cemented carbide sintered body needs to be supported by a support plate during the sintering process, the bottom of the cemented carbide sintered body will come into contact with the support plate. This will prevent the bottom of the cemented carbide sintered body from contacting the inert gas, resulting in a temperature difference between the top and bottom of the cemented carbide sintered body, which will affect the forming effect of the cemented carbide sintered body. Summary of the Invention

[0004] The purpose of this invention is to provide an apparatus and process for sintering cemented carbide, in order to solve the problem that the surface temperature of cemented carbide sintered bodies is prone to difference when cooling the inside of the sintering furnace.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an apparatus for sintering cemented carbide, comprising a sintering furnace body, a furnace cover installed on the sintering furnace body, a guide telescopic rod installed inside the sintering furnace body, an outer connecting ring installed at one end of the guide telescopic rod, a U-shaped frame provided on the outer side of the outer connecting ring, an inner connecting ring rotatably connected to the inner side of the outer connecting ring via a bearing, a guide block installed on the inner wall of the inner connecting ring, a telescopic cylinder connected to the inner side of the U-shaped frame, a clamping rotating component provided at the output end of the telescopic cylinder, a movable block slidably connected to the guide block via the clamping rotating component, a locking interlocking component provided on the side of the movable block away from the outer connecting ring, a support plate connected to the movable block via the locking interlocking component, and a hydraulic stabilizing unit installed on the side of the guide block away from the movable block.

[0006] As a further embodiment of the present invention: the clamping rotating component includes a connecting frame connected to the output end of the telescopic cylinder. A rotating shaft extending to the outside of the connecting frame is rotatably connected to the inner side of the connecting frame via a bearing. Both ends of the rotating shaft are rotatably connected to ratchet wheels located outside the connecting frame via a rotating shaft. A pawl engaging with the ratchet wheels is engaged with the outer side of the rotating shaft via a torsion spring. A transmission spur gear is installed at the end of the ratchet wheel away from the rotating shaft. An extension rod located below the transmission spur gear is installed at the bottom of the U-shaped frame. A positioning rack is installed at the end of the extension rod away from the U-shaped frame. A positioning rack is provided on the outer side of the rotating shaft within the connecting frame. The second transmission bevel gear on the side, the inner side of the connecting frame is rotatably connected to the first transmission bevel gear meshing with the second transmission bevel gear via a rotating shaft, one end of the rotating shaft connecting the first transmission bevel gear and the connecting frame is equipped with a push plate located on the outer side of the connecting frame, the push plate is rotatably connected to the inclined rod frame via a rotating shaft, the side of the movable block away from the support plate is equipped with a hinge frame, the side of the hinge frame away from the movable block is equipped with a transverse connecting plate, the side of the transverse connecting plate away from the hinge frame is inserted with a supplementary rod, the bottom end of the supplementary rod is provided with a connecting plate connected to the inclined rod frame, and the top of the supplementary rod is provided with a first return spring connected to the transverse connecting plate.

[0007] As a further embodiment of the present invention: multiple movable blocks are slidably connected to the guide block, and all of the movable blocks are connected to the hinge frame.

[0008] As a further embodiment of the present invention: the length of the positioning rack is one-quarter of the outer circumference of the transmission spur gear, and the diameter of the second transmission bevel gear is equal to that of the first transmission bevel gear.

[0009] As a further embodiment of the present invention: the latching locking component includes inclined guide blocks installed on both sides of the movable block, a locking hole is provided on the inner side of the movable block, a T-shaped insert plate is installed on the side of the support plate near the movable block and is slidably connected to the movable block, a latching pin is inserted into the inside of the T-shaped insert plate and extends to the inner side of the locking hole, and a third return spring connected to the latching pin is provided on the inner side of the T-shaped insert plate.

[0010] As a further embodiment of the present invention: the diameter of the locking hole and the locking pin are equal, and the end of the locking pin away from the T-shaped insert is rotatably connected to a ball bearing via a rotating shaft.

[0011] As a further embodiment of the present invention: the hydraulic stabilizing unit includes a positioning plate installed on the side of the guide block away from the movable block and located above the transverse connecting plate. A liquid storage pipe is installed on the top of the positioning plate, and a sleeve is installed at the bottom of the end of the positioning plate away from the guide block. A transition chamber is installed on the top of the positioning plate, located on the side of the liquid storage pipe and connected to the liquid storage pipe. A piston rod connected to the transverse connecting plate is inserted into the inside of the sleeve. A liquid-blocking plug is slidably connected inside the transition chamber. Some of the liquid-blocking plugs are provided with movable rods extending to the outside of the transition chamber. A second return spring connected to the transition chamber is provided on the outside of the movable rod. A push block is installed at the top of the push plate at the same horizontal height as the movable rod.

[0012] As a further aspect of the present invention: the transition chamber is provided with a through hole connected to the sleeve and the liquid storage pipe.

[0013] As a further embodiment of the present invention: the internal space of the liquid storage tube and the sleeve are equal in size, and the maximum moving distance of the transverse connecting plate is equal to the length of the sleeve.

[0014] This invention also discloses a cemented carbide sintering process, employing the aforementioned cemented carbide sintering apparatus, comprising the following steps:

[0015] S1: First, place the workpiece to be sintered on the top of the pallet. Then, connect the pallet to the movable block by using the interlocking mechanism so that the pallet is placed horizontally relative to the sintering furnace body. Then, push the U-shaped frame to allow the pallet to enter the sintering furnace body.

[0016] S2: Close the furnace cover and sinter the workpiece on the top of the pallet by operating the furnace body. After sintering, inert gas is injected into the furnace body and the sintered workpiece is cooled by extracting the injected inert gas. Then, the telescopic cylinder is started and the clamping rotating part is operated by extending and retracting the telescopic cylinder.

[0017] S3: When the telescopic cylinder extends a certain distance, multiple pallets inside the sintering furnace will move closer to each other to clamp the sintered workpiece placed on top of the pallet. As the telescopic cylinder continues to extend, the inner ring rotates 180 degrees relative to the outer ring. At the same time, the hydraulic stabilizing unit limits the pallet to ensure its stability.

[0018] S4: Then, by contracting the telescopic cylinder, the pallet is moved away from the center of the outer ring, so that the workpiece on the top of the pallet is no longer held by the pallet. By repeating this process, the inert gas inside the sintering furnace can come into full contact with the surface of the sintered workpiece, thereby improving the uniformity of cooling of the sintered workpiece.

[0019] S5: Open the furnace cover and pull out the U-shaped frame, then remove the sintered and cooled workpiece placed on top of the pallet.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. By setting up a clamping rotating component and activating the telescopic cylinder, when the telescopic cylinder extends, the push plate will press one end of the inclined frame to clamp and fix the sintered workpiece with the support plate. When the support plate clamps the workpiece to the limit, the telescopic cylinder continues to extend. At this time, the moving transmission spur gear of the connecting frame will rotate along the positioning rack to rotate the workpiece 180 degrees. When the telescopic cylinder returns to its original position, the support plate will return to its original position under the pull of the push plate, so that the surface of the sintered workpiece can fully contact the inert gas, thereby improving the uniformity of heat dissipation of the workpiece and improving the quality of the finished product.

[0022] 2. By setting a locking pin, after the workpiece to be sintered is placed on the pallet, the T-shaped insert plate is aligned with the movable block. Then, by pushing the pallet, the T-shaped insert plate is inserted into the movable block. During this process, the locking pin is squeezed and guided by the inclined guide block. At this time, the locking pin will retract into the T-shaped insert plate. When the locking pin moves to the position aligned with the locking hole, the locking pin will be inserted into the locking hole under the elastic restoring force of the third return spring. At the same time, the movable block will limit the up-down and back-forward movement of the pallet through the T-shaped insert plate, thereby realizing the quick installation of the pallet. Afterwards, the locking pin can be pulled to separate the locking pin from the locking hole, and then the pallet can be separated from the movable block. This realizes the quick installation and disassembly of the pallet. The operation is simple, saves a lot of time, and further improves the overall sintering efficiency of the equipment.

[0023] 3. By setting up a hydraulic stabilizing unit, when the transverse connecting plate moves towards the center of the outer ring, the transverse connecting plate will draw the aqueous solution inside the storage tube into the sleeve through the piston rod. As the push plate moves towards the outer ring, the push block will squeeze the movable rod, and the liquid blocking plug will move to the through hole on the transition chamber. At this time, the liquid blocking plug will obstruct the flow between the storage tube and the sleeve, thus preventing the aqueous solution inside the sleeve from moving. This improves the stability of the transverse connecting plate after movement and also prevents the transverse connecting plate from moving when the inner ring rotates relative to the outer ring, further improving the stability of the support plate in clamping the workpiece after sintering. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram showing the connection between the U-shaped frame and the tray of the present invention;

[0026] Figure 3 This is a schematic diagram showing the connection between the outer and inner rings of the present invention;

[0027] Figure 4 This is a schematic diagram showing the connection between the U-shaped frame and the push plate of the present invention;

[0028] Figure 5 This is a schematic diagram showing the connection between the hinge frame and the movable block of the present invention;

[0029] Figure 6 This is a schematic diagram showing the connection between the push plate and the transverse connecting plate of the present invention;

[0030] Figure 7 This is a schematic diagram showing the connection between the liquid storage tube and the sleeve of the present invention;

[0031] Figure 8 This is a schematic diagram showing the connection between the inclined frame and the hinge frame of the present invention;

[0032] Figure 9 This is a schematic diagram showing the connection between the tray and the movable block of the present invention.

[0033] In the diagram: 1. Sintering furnace body; 2. Furnace cover; 3. Outer connecting ring; 401. U-shaped frame; 402. Guide block; 403. Support plate; 404. Guide telescopic rod; 405. T-shaped insert plate; 406. Inner connecting ring; 407. Telescopic cylinder; 408. Connecting frame; 409. Extension rod; 410. Push plate; 411. Positioning rack; 412. Movable block; 413. Angled guide block; 414. Locking hole; 415. Positioning plate; 416. Angled frame; 417. Transmission spur gear; 418. 419. Ratchet; 420. Pawl; 421. First transmission bevel gear; 422. Rotating shaft; 423. Second transmission bevel gear; 424. Hinge frame; 425. Connecting plate; 426. Sleeve; 427. Push block; 428. Transverse connecting plate; 429. Locking pin; 430. Alternating rod; 431. First return spring; 432. Transition chamber; 433. Movable rod; 434. Second return spring; 435. Liquid-blocking plug; 436. Piston rod; 437. Third return spring; 438. Liquid storage tube. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0036] Please see Figures 1-9 In this embodiment of the invention, an apparatus for sintering hard alloys includes a sintering furnace body 1, a furnace cover 2 installed on the sintering furnace body 1, a guide telescopic rod 404 installed inside the sintering furnace body 1, an outer connecting ring 3 installed at one end of the guide telescopic rod 404, a U-shaped frame 401 provided on the outer side of the outer connecting ring 3, an inner connecting ring 406 rotatably connected to the inner side of the outer connecting ring 3 via a bearing, a guide block 402 installed on the inner wall of the inner connecting ring 406, a telescopic cylinder 407 connected to the inner side of the U-shaped frame 401, a clamping rotating component provided at the output end of the telescopic cylinder 407, a movable block 412 slidably connected to the guide block 402 connected to the output end of the telescopic cylinder 407 via the clamping rotating component, a latching interlocking component provided on the side of the movable block 412 away from the outer connecting ring 3, a support plate 403 connected to the movable block 412 via the latching interlocking component, and a hydraulic stabilizing unit installed on the side of the guide block 402 away from the movable block 412.

[0037] In this embodiment: First, the workpiece to be sintered is placed on top of the pallet 403. Then, the pallet 403 is connected to the movable block 412 by a fastening interlocking device, so that the pallet 403 is placed horizontally relative to the sintering furnace body 1. Then, the pallet 403 is pushed into the sintering furnace body 1 by pushing the U-shaped frame 401. The furnace cover 2 is closed, and the workpiece on top of the pallet 403 is sintered by the operation of the sintering furnace body 1. After sintering, inert gas is injected into the interior of the sintering furnace body 1, and the sintered workpiece is cooled by extracting the injected inert gas. Then, the telescopic cylinder 407 is activated. The extension and retraction of the telescopic cylinder 407 causes the clamping rotating device to operate. When the telescopic cylinder 407 extends a certain distance, the multiple pallets 403 inside the sintering furnace body 1 will move closer to each other, thereby sintering the top of the pallet 403. The sintered workpiece placed in the furnace is clamped. As the telescopic cylinder 407 continues to extend, the inner ring 406 rotates 180 degrees relative to the outer ring 3. At the same time, the hydraulic stabilizing unit limits the position of the pallet 403 to ensure its stability. Then, the telescopic cylinder 407 retracts to move the pallet 403 away from the center of the outer ring 3, so that the workpiece on top of the pallet 403 is no longer clamped by the pallet 403. As the pallet 403 returns to its original position, the surface of the workpiece that was originally in contact with the pallet 403 faces upward. This process is repeated so that the inert gas inside the furnace body 1 can make full contact with the surface of the sintered workpiece, thereby improving the uniformity of cooling of the sintered workpiece. The furnace cover 2 is opened and the U-shaped frame 401 is pulled out. Then, the sintered and cooled workpiece placed on top of the pallet 403 is removed.

[0038] Please refer to this carefully. Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8The clamping rotating component includes a connecting frame 408 connected to the output end of the telescopic cylinder 407. A rotating shaft 421 extending to the outside of the connecting frame 408 is rotatably connected to the inner side of the connecting frame 408 via a bearing. Both ends of the rotating shaft 421 are rotatably connected to ratchet wheels 418 located outside the connecting frame 408 via a rotating shaft. A pawl 419 engaging with the ratchet wheels 418 is engaged with the outer side of the rotating shaft 421 via a torsion spring. A transmission spur gear 417 is mounted on the end of the ratchet wheel 418 away from the rotating shaft 421. An extension rod 409 located below the transmission spur gear 417 is mounted on the bottom of the U-shaped frame 401. A positioning rack 411 is mounted on the end of the extension rod 409 away from the U-shaped frame 401. A second transmission bevel gear 42 is located on the outer side of the rotating shaft 421, inside the connecting frame 408. 2. The inner side of the connecting frame 408 is rotatably connected to a first transmission bevel gear 420 that meshes with the second transmission bevel gear 422 via a rotating shaft. One end of the rotating shaft connecting the first transmission bevel gear 420 and the connecting frame 408 is equipped with a push plate 410 located on the outer side of the connecting frame 408. A diagonal rod frame 416 is rotatably connected to the push plate 410 via a rotating shaft. A hinge frame 423 is installed on the side of the movable block 412 away from the support plate 403. A transverse connecting plate 427 is installed on the side of the hinge frame 423 away from the movable block 412. A supplementary rod 429 is inserted into the side of the transverse connecting plate 427 away from the hinge frame 423. A connecting plate 424 connected to the diagonal rod frame 416 is provided at the bottom end of the supplementary rod 429. A first return spring 430 connected to the transverse connecting plate 427 is provided at the top of the supplementary rod 429.

[0039] In this embodiment: After sintering, inert gas is filled into the furnace body 1 of the sintering furnace. At the same time, the telescopic cylinder 407 is activated. When the telescopic cylinder 407 extends, it drives the connecting frame 408 to move horizontally. At this time, the transmission spur gear 417 moves above the extension rod 409. The connecting frame 408 pushes the push plate 410 to move towards the outer ring 3. At this time, the push plate 410 will press one end of the inclined rod frame 416, so that the inclined rod frame 416 passes through the connecting plate 424, the supplementary rod 429, and the first The return spring 430 drives the transverse connecting plate 427 to move, causing the movable block 412 connected to the hinge frame 423 to move towards the center of the outer connecting ring 3. This allows the support plate 403 to clamp and fix the sintered workpiece, thus achieving synchronous and equidistant movement of the movable block 412. This ensures synchronous clamping of the workpiece on the support plate 403. After the support plate 403 clamps the workpiece to its limit, the telescopic cylinder 407 continues to extend. At this time, the transmission spur gear 417 will engage with the positioning rack 411. When engaged, as the connecting frame 408 moves, the transmission spur gear 417 rotates along the positioning rack 411. At this time, the transmission spur gear 417 drives the rotating shaft 421 to rotate via the ratchet 418 and pawl 419. Simultaneously, the connecting plate 424 moves relative to the transverse connecting plate 427 as the telescopic cylinder 407 continues to extend. At the same time, the second transmission bevel gear 422 drives the guide block 402 to rotate via the first transmission bevel gear 420 and the push plate 410, thereby causing the workpiece to rotate 180 degrees. When the telescopic cylinder 407 retracts, the transmission spur gear 417 rotates along the positioning rack 411. At this time, the transmission spur gear 417 drives the ratchet 418 to rotate relative to the rotating shaft 421, thereby making the rotating shaft 421 rotate in one direction. When the telescopic cylinder 407 returns to its original position, the support plate 403 will return to its original position under the pull of the push plate 410, so that the surface of the sintered workpiece is in full contact with the inert gas, thereby improving the uniformity of heat dissipation of the workpiece and improving the quality of the finished product.

[0040] Please refer to this carefully. Figure 8 Multiple movable blocks 412 are slidably connected to the guide block 402, and all of the movable blocks 412 are connected to the hinge frame 423.

[0041] In this embodiment: by setting this structure, when the transverse connecting plate 427 moves relative to the inner connecting ring 406, multiple movable blocks 412 will close and spread towards the center of the inner connecting ring 406 under the action of the hinge frame 423, so as to ensure that the distance between two adjacent movable blocks 412 is always equal.

[0042] Please refer to this carefully. Figure 4 The length of the positioning rack 411 is one-quarter of the outer circumference of the transmission spur gear 417, and the diameter of the second transmission bevel gear 422 is the same as that of the first transmission bevel gear 420.

[0043] In this embodiment: by setting this structure so that when the transmission spur gear 417 rotates along the positioning rack 411, the rotating shaft 421 drives the push plate 410 to rotate 180 degrees through the second transmission bevel gear 422 and the first transmission bevel gear 420, so that the pallet 403 remains in a horizontal state after flipping, thereby improving the stability of the workpiece placement.

[0044] Please refer to this carefully. Figure 1 , Figure 5 , Figure 8 , Figure 9 The locking mechanism includes inclined guide blocks 413 installed on both sides of the movable block 412. The inner side of the movable block 412 is provided with a locking hole 414. A T-shaped insert plate 405 that is slidably connected to the movable block 412 is installed on the side of the support plate 403 near the movable block 412. A locking pin 428 extending to the inner side of the locking hole 414 is inserted into the inside of the T-shaped insert plate 405. A third return spring 436 connected to the locking pin 428 is provided on the inner side of the T-shaped insert plate 405.

[0045] In this embodiment: After placing the workpiece to be sintered on the pallet 403, the T-shaped insert 405 is aligned with the movable block 412. Then, the pallet 403 is pushed to insert the T-shaped insert 405 into the movable block 412. During this process, the locking pin 428 is guided by the inclined guide block 413. At this time, the locking pin 428 will retract into the T-shaped insert 405. When the locking pin 428 moves to the position aligned with the locking hole 414, the locking pin 428 will be inserted into the locking hole 414 under the elastic restoring force of the third return spring 436, thereby securing the workpiece. The T-shaped insert plate 405 limits the left and right movement of the movable block 412. At the same time, the movable block 412 limits the up and down and forward and backward movement of the support plate 403 through the T-shaped insert plate 405, thereby realizing the quick installation of the support plate 403. Afterwards, the locking pin 428 can be pulled to separate it from the locking hole 414, and then the support plate 403 can be separated from the movable block 412. This realizes the quick installation and disassembly of the support plate 403. The operation is simple, saves a lot of time, and further improves the overall sintering efficiency of the equipment.

[0046] Please refer to this carefully. Figure 9 The locking hole 414 and the locking pin 428 have the same diameter at one end. The end of the locking pin 428 away from the T-shaped insert 405 is connected to the ball bearing via a rotating shaft.

[0047] In this embodiment, by setting this structure, the friction between the locking pin 428 and the movable block 412 and the inclined guide block 413 is reduced, thereby improving the service life of the locking pin 428 and also increasing the stability of the movable block 412 after it is connected to the support plate 403.

[0048] Please refer to this carefully. Figure 1 , Figure 5 , Figure 6 , Figure 7 The hydraulic stabilizing unit includes a positioning plate 415 installed on the side of the guide block 402 away from the movable block 412 and above the transverse connecting plate 427. A liquid storage pipe 437 is installed on the top of the positioning plate 415. A sleeve 425 is installed at the bottom of the end of the positioning plate 415 away from the guide block 402. A transition chamber 431 is installed on the top of the positioning plate 415, located on the side of the liquid storage pipe 437 and connected to the liquid storage pipe 437. A piston rod 435 connected to the transverse connecting plate 427 is inserted into the sleeve 425. A liquid blocking plug 434 is slidably connected inside the transition chamber 431. Some of the liquid blocking plugs 434 are provided with movable rods 432 extending to the outside of the transition chamber 431. A second return spring 433 connected to the transition chamber 431 is provided on the outside of the movable rod 432. A push block 426 at the same horizontal height as the movable rod 432 is installed on the top of the push plate 410.

[0049] In this embodiment: when the transverse connecting plate 427 moves toward the center of the outer connecting ring 3, the transverse connecting plate 427 will draw the aqueous solution inside the storage tube 437 into the sleeve 425 through the piston rod 435. As the push plate 410 moves toward the outer connecting ring 3, the push block 426 will squeeze the movable rod 432. At this time, the liquid blocking plug 434 will move to the through hole on the transition chamber 431. At this time, the storage tube 437 and the sleeve 425 will be obstructed by the liquid blocking plug 434. This will prevent the aqueous solution inside the sleeve 425 from moving, thereby improving the stability of the transverse connecting plate 427 after movement. It will also prevent the transverse connecting plate 427 from moving when the inner connecting ring 406 rotates relative to the outer connecting ring 3, further improving the stability of the support plate 403 in clamping the workpiece after sintering.

[0050] Please refer to this carefully. Figure 7 The transition chamber 431 is provided with a through hole that connects to the sleeve 425 and the liquid storage pipe 437.

[0051] In this embodiment: by setting this structure, when a negative pressure is formed inside the sleeve 425, the aqueous solution inside the liquid storage tube 437 passes through the transition chamber 431 and enters the sleeve 425. At the same time, the horizontal connecting plate 427 is fixed by blocking the through hole on the transition chamber 431 through the liquid blocking plug 434.

[0052] Please refer to this carefully. Figure 7 The internal space of the liquid storage tube 437 and the sleeve 425 is equal in size, and the maximum moving distance of the transverse connecting plate 427 is equal to the length of the sleeve 425.

[0053] In this embodiment, this structure is designed to prevent the piston rod 435 from obstructing the movement of the transverse connecting plate 427, thereby improving the smoothness of the movement of the transverse connecting plate 427.

[0054] The following describes a cemented carbide sintering process, based on the aforementioned apparatus, comprising the following steps:

[0055] S1: First, place the workpiece to be sintered on the top of the tray 403, align the T-shaped insert 405 with the movable block 412, and then push the tray 403 to insert the T-shaped insert 405 into the movable block 412. During this process, the locking pin 428 is squeezed and guided by the inclined guide block 413. At this time, the locking pin 428 will retract into the T-shaped insert 405. When the locking pin 428 moves to the position aligned with the locking hole 414, the locking pin 428 will be inserted into the locking hole 414 under the elastic restoring force of the third return spring 436. This limits the left and right movement of the T-shaped insert 405 relative to the movable block 412. At the same time, the movable block 412 limits the up and down and forward and backward movement of the tray 403 through the T-shaped insert 405, thereby realizing the quick installation of the tray 403.

[0056] S2: Close the furnace cover 2, and sinter the workpiece on the top of the pallet 403 by operating the furnace body 1. After sintering, inject inert gas into the furnace body 1 and cool the sintered workpiece by extracting the injected inert gas.

[0057] S3: Start the telescopic cylinder 407. When the telescopic cylinder 407 extends, it drives the connecting frame 408 to move horizontally. At this time, the transmission spur gear 417 moves above the extension rod 409. The connecting frame 408 pushes the push plate 410 to move towards the outer ring 3. At this time, the push plate 410 will press one end of the inclined rod frame 416, so that the inclined rod frame 416 drives the transverse connecting plate 427 to move through the connecting plate 424, the supplementary rod 429, and the first reset spring 430. This causes the movable block 412 connected to the hinge frame 423 to move towards the center of the outer ring 3, so that the support plate 403 clamps and fixes the sintered workpiece. When the support plate 403 clamps and limits the workpiece;

[0058] S4: The telescopic cylinder 407 continues to extend. At this time, the transmission spur gear 417 will mesh with the positioning rack 411. As the connecting frame 408 moves, the transmission spur gear 417 will rotate along the positioning rack 411. At this time, the transmission spur gear 417 drives the rotating shaft 421 to rotate through the ratchet 418 and pawl 419. At the same time, the connecting plate 424 moves relative to the transverse connecting plate 427 as the telescopic cylinder 407 continues to extend. Meanwhile, the second transmission bevel gear 422 drives the guide block 402 to rotate through the first transmission bevel gear 420 and the push plate 410, so as to make the workpiece rotate 180 degrees. When the transverse connecting plate 427 moves towards the center of the outer ring 3, the transverse connecting plate 427 will draw the aqueous solution inside the liquid storage tube 437 into the sleeve 425 through the piston rod 435.

[0059] S5: As the push plate 410 moves toward the outer ring 3, the push block 426 will press the movable rod 432. At this time, the liquid blocking plug 434 will move to the through hole on the transition chamber 431. The liquid storage tube 437 and the sleeve 425 will be obstructed by the liquid blocking plug 434. This will prevent the aqueous solution inside the sleeve 425 from moving, thereby improving the stability of the transverse connecting plate 427 after movement. It will also prevent the transverse connecting plate 427 from moving when the inner ring 406 rotates relative to the outer ring 3, further improving the stability of the support plate 403 in holding the workpiece after sintering.

[0060] S6: When the telescopic cylinder 407 retracts, the transmission spur gear 417 rotates along the positioning rack 411. At this time, the transmission spur gear 417 will drive the ratchet 418 to rotate relative to the rotating shaft 421, so that the rotating shaft 421 rotates in one direction. When the telescopic cylinder 407 returns to its original position, the support plate 403 will return to its original position under the pull of the push plate 410, so that the surface of the sintered workpiece is in full contact with the inert gas, thereby improving the uniformity of heat dissipation of the workpiece and improving the quality of the finished product.

[0061] S7: By repeatedly extending and retracting the telescopic cylinder 407, the inert gas inside the sintering furnace body 1 can make all-round contact with the surface of the sintered workpiece, thereby improving the uniformity of cooling of the sintered workpiece.

[0062] S8: Open the furnace cover 2 and pull out the U-shaped frame 401, then remove the sintered and cooled workpiece placed on top of the pallet 403.

[0063] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An apparatus for sintering cemented carbide, comprising a sintering furnace body (1), characterized in that, A furnace cover (2) is installed on the sintering furnace body (1). A guide telescopic rod (404) is installed inside the sintering furnace body (1). An outer connecting ring (3) is installed at one end of the guide telescopic rod (404). A U-shaped frame (401) is provided on the outer side of the outer connecting ring (3). An inner connecting ring (406) is rotatably connected to the inner side of the outer connecting ring (3) through a bearing. A guide block (402) is installed on the inner wall of the inner connecting ring (406). A telescopic gas valve is connected to the inner side of the U-shaped frame (401). The cylinder (407) has a clamping rotating part at its output end. The output end of the telescopic cylinder (407) is connected to a movable block (412) that is slidably connected to the guide block (402) through the clamping rotating part. A latching locking part is provided on the side of the movable block (412) away from the outer connecting ring (3). A support plate (403) is connected to the movable block (412) through the latching locking part. A hydraulic stabilizing unit is installed on the side of the guide block (402) away from the movable block (412). The clamping rotating component includes a connecting frame (408) connected to the output end of the telescopic cylinder (407). A rotating shaft (421) extending to the outside of the connecting frame (408) is rotatably connected to the inner side of the connecting frame (408) via a bearing. Both ends of the rotating shaft (421) are rotatably connected to ratchet wheels (418) located outside the connecting frame (408) via a rotating shaft. A pawl (419) engaging with the ratchet wheel (418) is spring-loaded onto the outer side of the rotating shaft (421). The ratchet wheel (419)... 8) A transmission spur gear (417) is installed at the end away from the rotating shaft (421). An extension rod (409) located below the transmission spur gear (417) is installed at the bottom of the U-shaped frame (401). A positioning rack (411) is installed at the end of the extension rod (409) away from the U-shaped frame (401). A second transmission bevel gear (422) located inside the connecting frame (408) is provided on the outer side of the rotating shaft (421). The inner side of the connecting frame (408) is rotatably connected to the first transmission bevel gear (422) via a rotating shaft. The first transmission bevel gear (420) meshes with the second transmission bevel gear (422). One end of the shaft connecting the first transmission bevel gear (420) to the connecting frame (408) is fitted with a push plate (410) located outside the connecting frame (408). A diagonal brace (416) is rotatably connected to the push plate (410) via a shaft. A hinge frame (423) is installed on the side of the movable block (412) away from the support plate (403). A horizontal crossbar is installed on the side of the hinge frame (423) away from the movable block (412). A supplementary rod (429) is inserted into the side of the transverse connecting plate (427) away from the hinge frame (423). The bottom end of the supplementary rod (429) is provided with a connecting plate (424) connected to the inclined frame (416). The top of the supplementary rod (429) is provided with a first return spring (430) connected to the transverse connecting plate (427). Multiple movable blocks (412) are slidably connected to the guide block (402). All of the multiple movable blocks (412) are connected to the hinge frame (423). The latching mechanism includes inclined guide blocks (413) installed on both sides of the movable block (412). The movable block (412) has a locking hole (414) on its inner side. The support plate (403) is equipped with a T-shaped insert plate (405) that is slidably connected to the movable block (412) on the side near the movable block (412). The T-shaped insert plate (405) has a latching pin (428) that extends to the inner side of the locking hole (414) inserted inside. The T-shaped insert plate (405) has a third return spring (436) that is connected to the latching pin (428) on its inner side.

2. The apparatus for sintering cemented carbide according to claim 1, characterized in that, The hydraulic stabilizing unit includes a positioning plate (415) installed on the side of the guide block (402) away from the movable block (412) and above the transverse connecting plate (427). A liquid storage pipe (437) is installed on the top of the positioning plate (415). A sleeve (425) is installed at the bottom of the end of the positioning plate (415) away from the guide block (402). A transition chamber (431) is installed on the top of the positioning plate (415) on the side of the liquid storage pipe (437) and connected to the liquid storage pipe (437). A sleeve (425) connected to the transverse connecting plate (427) is inserted inside the sleeve (425). The piston rod (435) is slidably connected to the inside of the transition chamber (431), and some of the liquid-blocking plugs (434) are provided with movable rods (432) extending to the outside of the transition chamber (431). A second return spring (433) connected to the transition chamber (431) is provided on the outside of the movable rod (432). A push block (426) at the same horizontal height as the movable rod (432) is installed on the top of the push plate (410). The transition chamber (431) is provided with through holes connected to the sleeve (425) and the liquid storage tube (437).

3. The apparatus for sintering cemented carbide according to claim 2, characterized in that, The length of the positioning rack (411) is one-quarter of the outer circumference of the transmission spur gear (417), and the diameter of the second transmission bevel gear (422) is equal to that of the first transmission bevel gear (420).

4. The apparatus for sintering cemented carbide according to claim 2, characterized in that, The locking hole (414) and the locking pin (428) have the same diameter. The end of the locking pin (428) away from the T-shaped insert (405) is connected to a ball bearing via a rotating shaft.

5. The apparatus for sintering cemented carbide according to claim 2, characterized in that, The internal space of the liquid storage tube (437) and the sleeve (425) is equal in size, and the maximum moving distance of the transverse connecting plate (427) is equal to the length of the sleeve (425).

6. A cemented carbide sintering process, characterized in that, The apparatus for sintering cemented carbide according to any one of claims 1-5 comprises the following steps: S1: First, place the workpiece to be sintered on the top of the pallet (403), and then connect the pallet (403) to the movable block (412) by means of the fastening interlocking parts, so that the pallet (403) is placed horizontally relative to the sintering furnace body (1). Then, push the U-shaped frame (401) to make the pallet (403) enter the sintering furnace body (1). S2: Close the furnace cover (2), and sinter the workpiece on the top of the pallet (403) by operating the furnace body (1). After sintering, inject inert gas into the furnace body (1) and cool the sintered workpiece by extracting the injected inert gas. Then start the telescopic cylinder (407) and operate the clamping rotating part by extending and retracting the telescopic cylinder (407). S3: When the telescopic cylinder (407) extends a certain distance, the multiple pallets (403) inside the sintering furnace body (1) will move closer to each other to clamp the sintered workpiece placed on top of the pallet (403). As the telescopic cylinder (407) continues to extend, the inner ring (406) rotates 180 degrees relative to the outer ring (3). At the same time, the hydraulic stabilizing unit limits the pallet (403) to ensure the stability of the pallet (403). S4: Then, by contracting the telescopic cylinder (407), the pallet (403) is moved away from the center of the outer ring (3), so that the workpiece on the top of the pallet (403) is not held by the pallet (403). By repeating this process, the inert gas inside the sintering furnace body (1) can come into full contact with the surface of the sintered workpiece, thereby improving the uniformity of cooling of the sintered workpiece. S5: Open the furnace cover (2) and pull out the U-shaped frame (401), then remove the sintered and cooled workpiece placed on top of the pallet (403).

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