CN117428188A - Press forming device based on powder metallurgy - Google Patents

Abstract

The invention discloses a compression molding device based on powder metallurgy, and relates to the technical field of powder metallurgy. The powder metallurgy-based compression molding device comprises an operation table, a lower die and an upper die punch, wherein the lower die and the upper die punch are used for compression molding, the lower die is fixed at the upper end of the operation table, a lifting table is arranged above the operation table, and a die cavity is formed in the lifting table. This kind of compression molding device based on powder metallurgy is carrying out compression molding's in-process to powder, through the mutually supporting of operation box and movable assembly, slip subassembly and drive assembly, accomplish the shaping processing of powder, in the in-process of shaping processing, through the setting of operation box to the seal and the upper punch of powder at the operation box inside, make the powder in filling and extruded in-process all be in the state of relative seal, reduce the probability that non-compression molding's powder contacted with the air, avoid causing the oxygen content increase of powder because of contacting with the air, further guarantee the intensity of product after the shaping.

Description

A press forming device based on powder metallurgy

Technical field

The invention relates to the technical field of powder metallurgy, specifically a press forming device based on powder metallurgy.

Background technique

Powder metallurgy is a process technology that produces metal powder or uses metal powder as raw material, forming and sintering to manufacture metal materials, composite materials and various types of products. Powder metallurgy is similar to the production of ceramics. Both belong to powder sintering technology. Therefore, a series of new powder metallurgy technologies can also be used for the preparation of ceramic materials. Due to the advantages of powder metallurgy technology, it has become the key to solving new material problems and plays a decisive role in the development of new materials.

The press forming device is a device used to press and shape powder in the powder metallurgy process. During the process of pressing and forming the powder, the powder to be formed will be in contact with the outside air before pressing, increasing the oxygen content inside the powder. When the powder contains a high amount of oxygen, the solid solution diffusion at grain boundaries is significantly affected, resulting in a reduction in the strength of the molded product.

Contents of the invention

The purpose of the present invention is to provide a press forming device based on powder metallurgy to solve the problems raised in the above background technology.

In order to achieve the above object, the present invention provides the following technical solution: a press forming device based on powder metallurgy, including an operating platform and a lower die and an upper die used for press forming. The lower die is fixed on the upper end of the operating platform, so A lifting platform is provided above the operating platform. A mold cavity is provided on the lifting platform. The lower mold is slidingly connected to the mold cavity. A lifting assembly for lifting the lifting platform and a lifting assembly are provided on the operating platform. A guide assembly for guiding, an operation box is provided above the lifting platform, a push plate for powder troweling and pushing is fixed inside the operation box, and the inside of the operation box forms a first operation chamber through the division of the push plate. The second operating chamber is connected with the first operating chamber and the second operating chamber. The upper die punch is arranged inside the first operating chamber, and the first operating chamber is provided with a connecting component for connecting the upper die punch. , the operation box is arranged to offset the upper end of the lifting platform, the lifting platform is provided with a moving component for moving the operation box, and the lifting platform is provided with a sliding component for sliding guidance during the movement of the operating box, the The operating table is provided with a transmission assembly for driving the upper die punch. The inside of the second operating chamber is provided with an air extraction assembly for air extraction from the inside of the operating box. The operating table is provided with a transmission assembly for evacuation of the second operating chamber. Feed assembly for internal feeding.

Preferably, the lifting assembly and the guide assembly are respectively located on both sides of the lifting platform. The lifting assembly includes a first fixed plate fixed on one side of the lifting platform. A threaded rod is rotatably connected to the first fixed plate. A threaded tube is threadedly connected to the threaded rod, one end of the threaded tube is fixed to the upper end of the operating table, and a drive motor for driving the threaded rod is installed on the upper end of the first fixed plate;

The guide assembly includes a second fixed plate fixed on one side of the lifting platform, a first sliding rod is fixed on the second fixed plate, and a first sleeve is slidably connected to the first sliding rod. One end of the casing is fixed to the upper end of the operating table.

Preferably, the moving assembly includes a third fixed plate fixed on the lifting platform, a cylinder is fixed on one side of the third fixed plate, and the output end of the cylinder is fixed to one side of the operating box.

Preferably, the sliding assembly includes two second sleeves fixed on the third fixed plate, the two second sleeves are located on both sides of the cylinder, and the two second sleeves are slidably connected with A second sliding rod, one end of which is fixed to one side of the operating box.

Preferably, the feed assembly includes an L-shaped frame fixed on the upper end of the operating table, a storage tank for powder storage is installed on the L-shaped frame, and the storage tank is connected to the second operating chamber of the operating box. There is a delivery pipe.

Preferably, the connection assembly includes a connecting rod slidably connected to the operation box. One end of the connecting rod is located inside the first operating chamber and is fixed to the upper die punch. The outer side of the connecting rod is sleeved with the first Spring, the two ends of the first spring are connected to the inner wall of the first operating cavity and the upper die punch respectively.

Preferably, the transmission assembly includes a fixed rod fixed on the upper end of the operating table, a top plate is fixed at one end of the fixed rod, a transmission plate is fixed at the lower end of the top plate, and there are openings on both sides of the transmission plate for connection with One end of the rod is against the first inclined surface pushed.

Preferably, the air extraction assembly includes an air extraction pipe installed on the operation box. One end of the air extraction pipe is communicated with the inside of the second operating chamber. An air outlet pipe is installed on the air extraction pipe. The air extraction pipe and A first one-way valve and a second one-way valve are respectively installed on the air outlet pipe. The conduction direction of the first one-way valve and the second one-way valve is from the inside of the operating box to the outside of the air outlet pipe. The air extraction pipe A piston plate is slidably connected to the top plate, an extrusion assembly for extruding the piston plate is provided on the top plate, and a reset assembly for resetting the piston plate after extrusion is provided on the exhaust pipe.

Preferably, the reset assembly includes a piston rod slidably connected to one end of the exhaust pipe, one end of the piston rod is fixed to the piston plate, and a second spring is set on the outside of the piston rod.

Preferably, the extrusion assembly includes a plurality of extrusion plates arranged and fixed on the lower end of the top plate. Each extrusion plate is provided with a second inclined plane on both sides for pushing against one end of the piston rod.

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

This type of press-forming device based on powder metallurgy completes the powder forming process through the cooperation of the operating box, the moving component, the sliding component and the transmission component during the process of pressing the powder. The sealing of the powder box and the setting of the upper die punch inside the operation box keep the powder in a relatively sealed state during the filling and extrusion processes, reducing the probability of the unpressed powder coming into contact with the air and avoiding the risk of contact with the air. This causes the oxygen content of the powder to increase, further ensuring the strength of the molded product.

Description of the drawings

Figure 1 is a schematic diagram of the overall appearance structure of the present invention;

Figure 2 is a schematic structural diagram of the moving component and sliding component of the present invention;

Figure 3 is a schematic structural diagram of the transmission assembly of the present invention;

Figure 4 is a schematic structural diagram of the lifting assembly and guide assembly of the present invention;

Figure 5 is a schematic structural diagram of the connection component, air extraction component and reset component of the present invention;

Figure 6 is a schematic structural diagram of the extrusion assembly of the present invention.

In the picture: 101. Operating table; 102. Lower mold; 103. Upper mold punch; 2. Lifting table; 3. Mold cavity; 4. Lifting assembly; 401. First fixed plate; 402. Threaded rod; 403. Threaded pipe ; 404. Drive motor; 5. Guide assembly; 501. Second fixed plate; 502. First slide rod; 503. First casing; 6. Operation box; 601. First operating chamber; 602. Second operating chamber ; 7. Push plate; 8. Moving component; 801. Third fixed plate; 802. Cylinder; 9. Sliding component; 901. Second casing; 902. Second sliding rod; 10. Feeding component; 1001. L 1002. Storage tank; 1003. Delivery pipe; 11. Connection component; 1101. Connecting rod; 1102. First spring; 12. Transmission component; 1201. Fixed rod; 1202. Top plate; 1203. Transmission plate; 1204. First slope; 13. Air extraction component; 1301. Air extraction pipe; 1302. Air outlet pipe; 1303. First one-way valve; 1304. Second one-way valve; 1305. Piston plate; 14. Reset assembly; 1401. Piston rod ; 1402. Second spring; 15. Extrusion assembly; 1501. Extrusion plate; 1502. Second slope.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Please refer to Figures 1 to 6. The present invention provides a technical solution: a press forming device based on powder metallurgy, including an operating table 101 and a lower die 102 and an upper die punch 103 for press forming. The lower die 102 is fixed on The upper end of the operating platform 101 is provided with a lifting platform 2 above the operating platform 101. A mold cavity 3 is provided on the lifting platform 2. The lower mold 102 is slidingly connected to the mold cavity 3. The operating platform 101 is provided with a lifting platform 2 for lifting and lowering the lifting platform 2. The lifting assembly 4 and the guide assembly 5 that are guided during the lifting process. An operation box 6 is provided above the lifting platform 2. A push plate 7 for powder troweling is fixed inside the operation box 6, and the inside of the operation box 6 is pushed through The dividing effect of the plate 7 forms a first operating chamber 601 and a second operating chamber 602. The first operating chamber 601 and the second operating chamber 602 are connected. The upper die punch 103 is arranged inside the first operating chamber 601, and the first operating chamber 601 and the second operating chamber 602 are connected. The operating chamber 601 is provided with a connecting component 11 for connecting the upper die punch 103. The operating box 6 is arranged to offset the upper end of the lifting platform 2. The lifting platform 2 is provided with a moving component 8 for moving the operating box 6. On the lifting platform 2 A sliding assembly 9 is provided for sliding guidance during the movement of the operating box 6. The operating table 101 is provided with a transmission assembly 12 for transmitting the upper die punch 103. The second operating chamber 602 is provided with a sliding assembly for pumping the interior of the operating box 6. The air extraction assembly 13 is provided on the operating table 101 with a feeding assembly 10 for feeding the inside of the second operating chamber 602; during the process of the pressing and molding device pressing and molding the powder, the operating box 6 and the moving assembly 8 and the sliding The component 9 and the transmission component 12 cooperate with each other to complete the molding process of the powder. During the molding process, the powder is sealed by the operation box 6 and the upper die punch 103 is set inside the operation box 6, so that the powder is filled and extruded. During the pressing process, it is in a relatively sealed state, which reduces the probability of the unpressed powder coming into contact with air, avoids an increase in the oxygen content of the powder due to contact with air, and further ensures the strength of the molded product.

Please refer to Figure 4. The lifting assembly 4 and the guide assembly 5 are located on both sides of the lifting platform 2 respectively. The lifting assembly 4 includes a first fixed plate 401 fixed on one side of the lifting platform 2. A threaded rod is rotatably connected to the first fixed plate 401. 402. A threaded pipe 403 is threadedly connected to the threaded rod 402. One end of the threaded pipe 403 is fixed to the upper end of the operating table 101. A drive motor 404 for driving the threaded rod 402 is installed on the upper end of the first fixed plate 401; guide assembly 5 It includes a second fixed plate 501 fixed on one side of the lifting platform 2. A first sliding rod 502 is fixed on the second fixed plate 501. A first sleeve 503 is slidably connected to the first sliding rod 502. The first sleeve 503 One end is fixed to the upper end of the operating table 101; the driving motor 404 is started, and the threaded rod 402 is driven to rotate through the driving motor 404. During the rotation of the threaded rod 402, the threaded rod 402 and the threaded pipe 403 are engaged with each other. The transmission drives the lifting platform 2 to move. During the movement of the lifting platform 2, through the guiding function of the first slide rod 502 and the first sleeve 503, the lifting platform 2 is made to move up and down after being stressed.

Please refer to Figures 2 and 3. The mobile assembly 8 includes a third fixed plate 801 fixed on the lifting platform 2. A cylinder 802 is fixed on one side of the third fixed plate 801. The output end of the cylinder 802 is connected to one side of the operation box 6. phase fixed; the sliding assembly 9 includes two second sleeves 901 fixed on the third fixed plate 801. The two second sleeves 901 are located on both sides of the cylinder 802. The two second sleeves 901 are slidingly connected with Second sliding rod 902, one end of the second sliding rod 902 is fixed to one side of the operating box 6; start the cylinder 802, and pull the operating box 6 to move on the lifting platform 2 through the cylinder 802. During the movement of the operating box 6 , the operation box 6 moves horizontally on the lifting platform 2 through the sliding guide function of the two second sleeves 901 and the second sliding rod 902 .

Please refer to Figure 1, Figure 2 and Figure 3. The feeding assembly 10 includes an L-shaped frame 1001 fixed on the upper end of the operating table 101. A storage tank 1002 for powder storage is installed on the L-shaped frame 1001. The storage tank 1002 and the operating box 6 A conveying pipe 1003 is connected between the second operating chambers 602; the powder inside the storage tank 1002 is conveyed to the inside of the second operating chamber 602 of the operating box 6 through the conveying tube 1003, and the powder is supplied to the inside of the second operating chamber 602. Material transportation.

Please refer to Figure 5. The connection assembly 11 includes a connecting rod 1101 that is slidably connected to the operation box 6. One end of the connecting rod 1101 is located inside the first operating chamber 601 and is fixed to the upper die punch 103. The outer side of the connecting rod 1101 is sleeved There is a first spring 1102, and both ends of the first spring 1102 are respectively connected to the inner wall of the first operating chamber 601 and the upper die punch 103; through the connecting rod 1101, the upper die punch 103 is slidingly connected, and through the first spring 1102, It is convenient for the reset movement of the upper die punch 103 after movement.

Please refer to Figure 5. The transmission assembly 12 includes a fixed rod 1201 fixed on the upper end of the operating table 101. A top plate 1202 is fixed at one end of the fixed rod 1201. A transmission plate 1203 is fixed at the lower end of the top plate 1202. There are holes on both sides of the transmission plate 1203 for The first inclined surface 1204 is pushed against one end of the connecting rod 1101; during the movement of the operating box 6, the connecting rod 1101 on the operating box 6 is offset against the first inclined surface 1204 of the transmission plate 1203 on the top plate 1202, and through the first inclined surface 1204 Push the connecting rod 1101 to move toward the inside of the first operating cavity 601. During the movement of the connecting rod 1101, the upper die punch 103 is pushed to move downward inside the second operating cavity 602. During the movement of the upper die punch 103 , the powder inside the mold cavity 3 is pressed and formed through the upper die punch 103 to complete the powder forming process.

Please refer to Figure 5. The air extraction assembly 13 includes an air extraction pipe 1301 installed on the operation box 6. One end of the air extraction pipe 1301 is communicated with the inside of the second operating chamber 602. The air extraction pipe 1301 is connected with an air outlet pipe 1302. A first one-way valve 1303 and a second one-way valve 1304 are respectively installed on 1301 and the air outlet pipe 1302. The conduction direction of the first one-way valve 1303 and the second one-way valve 1304 is from the inside of the operating box 6 to the air outlet pipe 1302. Outside, a piston plate 1305 is slidably connected to the air extraction pipe 1301. An extrusion assembly 15 for squeezing the piston plate 1305 is provided on the top plate 1202. A reset assembly 14 is provided on the air extraction pipe 1301 for resetting the piston plate 1305 after extrusion. ; During the movement of the operation box 6 for powder pressing and molding, the piston rod 1401 and the piston plate 1305 at one end of the piston rod 1401 are driven to reciprocate inside the air extraction pipe 1301 through transmission. Because the first one-way valve 1303 and the second one-way valve The conduction direction of the valve 1304 is from the inside of the operating box 6 to the outside of the air outlet pipe 1302. Through the reciprocating motion of the piston plate 1305, part of the gas inside the second operating chamber 602 is sucked into the inside of the air exhaust pipe 1301 and extruded from the outlet pipe. The air is discharged from the air pipe 1302 to evacuate the inside of the second operating chamber 602, reducing the gas inside the operating box 6, assisting the powder in deoxygenating the powder, and further facilitating the oxygen-insulated pressing and molding operation of the powder.

Please refer to Figures 5 and 6. The reset assembly 14 includes a piston rod 1401 slidably connected to one end of the exhaust pipe 1301. One end of the piston rod 1401 is fixed to the piston plate 1305. A second spring 1402 is set on the outside of the piston rod 1401; The pressing assembly 15 includes a plurality of extruding plates 1501 arranged and fixed at the lower end of the top plate 1202. Each extruding plate 1501 is provided with a second inclined plane 1502 on both sides for pushing against one end of the piston rod 1401; the operation box 6 moves to perform powder pressing. During the molding process, as the operation box 6 moves, one end of the piston rod 1401 is offset against the second inclined surface 1502 of each extrusion plate 1501 respectively. The upper second spring 1402 resets the piston rod 1401 after movement, driving the piston rod 1401 and the piston plate 1305 at one end of the piston rod 1401 to reciprocate inside the exhaust pipe 1301.

Working principle: During the process of pressing and molding powder by the pressing and molding device, the powder inside the storage tank 1002 is transported to the inside of the second operating chamber 602 of the operating box 6 through the conveying pipe 1003, and the powder is supplied to the inside of the second operating chamber 602. Material transportation. After the transportation is completed, the cylinder 802 is started, and the operation box 6 is pulled by the cylinder 802 to move on the lifting platform 2. During the movement of the operation box 6, through the two second sleeves 901 and the second slide rod 902 The sliding guide function enables the operation box 6 to move horizontally on the lifting platform 2;

During the horizontal movement of the operating box 6 on the lifting platform 2, when the second operating cavity 602 on the operating box 6 moves above the mold cavity 3, the powder transported inside the second operating cavity 602 falls to the mold cavity 3 Inside the mold cavity 3, the inside of the mold cavity 3 is filled, and as the operation box 6 continues to move, the filled powder stacked inside the mold cavity 3 is smoothed through the push plate 7 inside the operation box 6, and the filled powder is smoothed inside the operation box 6. 6 during the movement, the connecting rod 1101 on the operating box 6 is made to offset the first inclined surface 1204 of the transmission plate 1203 on the top plate 1202, and the connecting rod 1101 is pushed toward the inside of the first operating chamber 601 through the first inclined surface 1204. During the movement of the connecting rod 1101, the upper die punch 103 is pushed to move downward inside the second operating cavity 602. During the movement of the upper die punch 103, the powder inside the mold cavity 3 is pressed and formed by the upper die punch 103. , complete the molding process of the powder. During the molding process, the powder is sealed by the operation box 6 and the upper die punch 103 is arranged inside the operation box 6, so that the powder is relatively sealed during the filling and extrusion processes. state, reducing the probability of the unpressed powder being in contact with air, avoiding an increase in the oxygen content of the powder due to contact with air, and further ensuring the strength of the molded product;

During the process of powder pressing and molding when the operation box 6 moves, as the operation box 6 moves, one end of the piston rod 1401 is offset against the second inclined surface 1502 of each extrusion plate 1501, and the second inclined surface 1502 and the piston rod 1401 Offsetting the pushing action and the reset action of the second spring 1402 on the reset assembly 14 on the piston rod 1401 after movement, the piston rod 1401 and the piston plate 1305 at one end of the piston rod 1401 are driven to reciprocate inside the exhaust pipe 1301. Because the first one-way valve The conduction direction of 1303 and the second one-way valve 1304 is from the inside of the operating box 6 to the outside of the air outlet pipe 1302. Through the reciprocating motion of the piston plate 1305, part of the gas inside the second operating chamber 602 is sucked into the inside of the air exhaust pipe 1301. And it is discharged from the air outlet pipe 1302 by extrusion, and the inside of the second operation chamber 602 is evacuated, reducing the gas inside the operation box 6, assisting the powder in deoxygenating operation, and further facilitating the oxygen-isolated pressing and molding operation of the powder;

After the pressing and molding is completed, the driving motor 404 is started, and the threaded rod 402 is driven to rotate through the driving motor 404. During the rotation of the threaded rod 402, the lifting platform is driven by the mutual meshing transmission between the threaded rod 402 and the threaded tube 403. 2 moves. During the movement of the lifting platform 2, through the guiding function of the first slide rod 502 and the first sleeve 503, the lifting platform 2 is forced to perform a downward movement. The supporting function of the mold 102 allows the product after being pressed and formed inside the mold cavity 3 to be demoulded, which facilitates the material taking operation.

Claims (10)

1. A press molding device based on powder metallurgy, including an operating table (101) and a lower mold (102) and an upper die punch (103) for press forming. The lower mold (102) is fixed on the operating table (101). ), characterized in that: a lifting platform (2) is provided above the operating platform (101), a mold cavity (3) is provided on the lifting platform (2), and the lower mold (102) is slidingly connected On the mold cavity (3), the operating table (101) is provided with a lifting assembly (4) for lifting the lifting table (2) and a guide assembly (5) for guiding during the lifting process. The lifting table (2) ) is provided with an operation box (6) above the operation box (6). A push plate (7) for smoothing and pushing powder is fixed inside the operation box (6), and the inside of the operation box (6) is divided by the push plate (7). The first operating chamber (601) and the second operating chamber (602) are formed. The first operating chamber (601) and the second operating chamber (602) are communicated with each other. The upper die punch (103) is arranged on the first operating chamber (602). Inside an operating chamber (601), and the first operating chamber (601) is provided with a connecting component (11) for connecting the upper die punch (103), the operating box (6) and the upper end of the lifting platform (2) The lifting platform (2) is provided with a moving assembly (8) for moving the operation box (6), and the lifting platform (2) is provided with a sliding guide for sliding the operation box (6) during its movement. Sliding assembly (9), the operating platform (101) is provided with a transmission assembly (12) for transmitting the upper die punch (103), and the inside of the second operating chamber (602) is provided with a transmission assembly (12) for transmitting the operation box (103). 6) An air extraction assembly (13) for internal air extraction. The operating platform (101) is provided with a feeding assembly (10) for feeding materials inside the second operating chamber (602). 2. A press forming device based on powder metallurgy according to claim 1, characterized in that: the lifting assembly (4) and the guide assembly (5) are respectively located on both sides of the lifting platform (2). The assembly (4) includes a first fixed plate (401) fixed on one side of the lifting platform (2). A threaded rod (402) is rotatably connected to the first fixed plate (401). The threaded rod (402) A threaded pipe (403) is connected with threads. One end of the threaded pipe (403) is fixed to the upper end of the operating table (101). The upper end of the first fixed plate (401) is equipped with a screw for driving the threaded rod (402). drive motor (404); The guide assembly (5) includes a second fixed plate (501) fixed on one side of the lifting platform (2), and a first slide rod (502) is fixed on the second fixed plate (501). A first sleeve (503) is slidably connected to the sliding rod (502), and one end of the first sleeve (503) is fixed to the upper end of the operating table (101). 3. A press forming device based on powder metallurgy according to claim 1, characterized in that: the moving component (8) includes a third fixed plate (801) fixed on the lifting platform (2), and the A cylinder (802) is fixed on one side of the third fixed plate (801), and the output end of the cylinder (802) is fixed on one side of the operation box (6). 4. A press forming device based on powder metallurgy according to claim 3, characterized in that: the sliding assembly (9) includes two second sleeves (901) fixed on the third fixed plate (801) ), the two second sleeves (901) are respectively located on both sides of the cylinder (802), and the two second sleeves (901) are slidingly connected with a second sliding rod (902). One end of the sliding rod (902) is fixed to one side of the operating box (6). 5. A press forming device based on powder metallurgy according to claim 1, characterized in that: the feeding assembly (10) includes an L-shaped frame (1001) fixed on the upper end of the operating table (101), and the A storage tank (1002) for powder storage is installed on the L-shaped frame (1001), and a delivery pipe (1003) is connected between the storage tank (1002) and the second operating chamber (602) of the operating box (6). . 6. A press forming device based on powder metallurgy according to claim 1, characterized in that: the connection component (11) includes a connecting rod (1101) slidably connected to the operation box (6), and the connection One end of the rod (1101) is located inside the first operating chamber (601) and is fixed to the upper die punch (103). A first spring (1102) is set on the outside of the connecting rod (1101). Both ends of the spring (1102) are connected to the inner wall of the first operating chamber (601) and the upper die punch (103) respectively. 7. A press forming device based on powder metallurgy according to claim 6, characterized in that: the transmission assembly (12) includes a fixed rod (1201) fixed on the upper end of the operating table (101), and the fixed rod (1201) is fixed on the upper end of the operating table (101). A top plate (1202) is fixed at one end of the rod (1201), and a transmission plate (1203) is fixed at the lower end of the top plate (1202). There are openings on both sides of the transmission plate (1203) to offset one end of the connecting rod (1101). Push the first slope (1204). 8. A press forming device based on powder metallurgy according to claim 7, characterized in that: the air extraction assembly (13) includes an air extraction pipe (1301) installed on the operation box (6), and the air extraction assembly (1301) One end of the air pipe (1301) is communicated with the inside of the second operating chamber (602). An air outlet pipe (1302) is installed on the air extraction pipe (1301). The air extraction pipe (1301) and the air outlet pipe (1302) are connected to each other. A first one-way valve (1303) and a second one-way valve (1304) are installed respectively, and the conduction direction of the first one-way valve (1303) and the second one-way valve (1304) is the operation box (6) from the inside to the outside of the air outlet pipe (1302), the air extraction pipe (1301) is slidably connected with a piston plate (1305), and the top plate (1202) is provided with an extrusion assembly for extruding the piston plate (1305) (15). The exhaust pipe (1301) is provided with a reset assembly (14) for resetting the piston plate (1305) after extrusion. 9. A press forming device based on powder metallurgy according to claim 8, characterized in that: the reset assembly (14) includes a piston rod (1401) slidably connected to one end of the exhaust pipe (1301), and the piston One end of the rod (1401) is fixed to the piston plate (1305), and a second spring (1402) is set on the outside of the piston rod (1401). 10. A press forming device based on powder metallurgy according to claim 8, characterized in that: the extrusion assembly (15) includes a plurality of extrusion plates (1501) arranged and fixed at the lower end of the top plate (1202), A second inclined plane (1502) is provided on both sides of each squeeze plate (1501) for pushing against one end of the piston rod (1401).