Processing molds for powder metallurgy molding

Abstract

The present invention discloses a processing die for powder metallurgy forming in the field of powder metallurgy technology, comprising a female die, an upper die punch assembly and a lower die punch assembly, wherein the upper die punch assembly comprises an upper die punch top plate, an upper die punch and an upper hook, the upper die punch can be inserted into the cavity of the female die from top to bottom, the upper end of the upper hook is hinged to the side of the upper die punch top plate, and a wedge-shaped hook is provided at the lower end, and the lower die punch assembly comprises a lower die punch bottom plate, a lower die punch and a lower hook, the lower die punch can be inserted into the cavity of the female die from bottom to top, the lower end of the lower hook is fixed to the side of the lower die punch bottom plate, and a wedge-shaped hook is provided at the upper end. When the upper die punch assembly and the lower die punch assembly are molded together to press the powder, the upper hook and the lower hook will be hooked to each other, and then in the process of opening the mold, the upper die punch assembly can drive the lower die punch assembly to move up together when moving up, so as to eject the pressed part model upward from the cavity of the female model, thereby improving the efficiency of mold removal and ensuring the safety of the part model.

Description

Technical Field

[0001] The invention relates to the technical field of powder metallurgy, and in particular to a processing die for powder metallurgy molding. Background Art

[0002] Powder metallurgy is a process technology for producing metal powder or using metal powder as raw material, forming and sintering, to manufacture metal materials, composite materials and various types of products. The forming of metal powder is generally pressed by a mold. The mold is a variety of molds and tools used in industrial production to obtain the desired products by injection molding, blow molding, extrusion, die casting or forging molding, smelting, stamping and other methods. The mold has a specific contour or inner cavity shape. The inner cavity shape can be used to make the blank obtain the corresponding three-dimensional shape. The mold generally includes a movable mold and a fixed mold. When the two are separated, the product can be taken out. When they are closed, the powder can be pressed and formed in the mold cavity. For powder metallurgy, due to the need for greater pressure, a two-way pressing powder metallurgy mold is usually used. The specific structure usually includes two upper and lower die punches and a female die. The two die punches extrude the powder in the cavity of the female die in both directions to form a model. The disadvantage of this mold is that the female die is usually an integral structure and cannot be separated. When taking the mold, a separate tool is required to eject the model from the female mold cavity, which is troublesome to operate and easy to damage the model, thereby affecting the product quality. Summary of the invention

[0003] In order to overcome the shortcomings of the existing two-way pressing powder metallurgy mold, such as inconvenient mold removal, the technical problem to be solved by the present invention is to provide a processing mold for powder metallurgy molding that can facilitate demoulding and ensure the safety of the model.

[0004] The technical solution adopted by the present invention to solve the technical problem is:

[0005] Processing molds for powder metallurgy molding,

[0006] It includes a female die assembly, an upper die punch assembly and a lower die punch assembly;

[0007] The female mold assembly includes a female mold, and the female mold is provided with a cavity penetrating the upper and lower surfaces thereof;

[0008] The upper die punch assembly comprises an upper die punch top plate, an upper die punch and an upper draw hook, wherein the upper die punch is located at the bottom center of the upper die punch top plate, and the upper die punch can penetrate into the cavity of the female die from top to bottom, and the upper end of the upper draw hook is hinged to the side of the upper die punch top plate, and the lower end is provided with a wedge-shaped hook head;

[0009] The lower die punch assembly comprises a lower die punch bottom plate, a lower die punch and a lower draw hook, wherein the lower die punch is located at the top center of the lower die punch bottom plate, and the lower die punch can penetrate into the cavity of the female die from bottom to top, and the lower end of the lower draw hook is fixed to the side of the lower die punch bottom plate, and the upper end is provided with a wedge-shaped hook head;

[0010] When the upper punch assembly moves downward, the upper hook can rotate around the hinge point at its upper end under the action of the inclined surfaces of the wedge-shaped hook heads of the upper hook and the lower hook, and then hook with the lower hook.

[0011] Furthermore, it also includes a powder loading component, which includes a powder loading bracket and a powder loading groove slidably arranged on the powder loading bracket, the bottom of the powder loading groove is provided with a feeding port, and its bottom is in close contact with the upper surface of the powder loading bracket, the female mold is arranged at the bottom of one end of the powder loading bracket, and the powder loading bracket is provided with a powder loading port connected to the cavity of the female mold.

[0012] Furthermore, the powder loading assembly also includes a powder delivery shoe seat, which is located on the end of the powder loading bracket away from the female mold. The top of the powder delivery shoe seat is provided with a powder inlet baffle which can be slid open along its top plane. The powder loading trough can slide into the powder delivery shoe seat, and its top is flush with the bottom surface of the powder inlet baffle, and the top opening of the powder loading trough is completely blocked by the powder inlet baffle.

[0013] Furthermore, a hook release rod is provided on the side of the powder loading groove, one end of the hook release rod is fixedly connected to the powder loading groove, and the other end is provided with an arc-shaped protrusion protruding outward on the side away from the powder loading groove. When the powder loading groove moves toward the female mold, the arc-shaped protrusion on the hook release rod can make the upper hook rotate around its upper end hinge point, thereby disengaging from the lower hook.

[0014] Furthermore, a part ejection plate is provided on one end of the powder loading trough close to the female mold, and a part receiving frame is provided on one end of the powder loading bracket close to the female mold. When the powder loading trough moves to just above the powder loading port, the part ejection plate can extend into the part receiving frame.

[0015] Furthermore, two opposite sides of the female mold are provided with slide grooves connected to the middle cavity, a slider is slidably arranged in the slide groove, the outer end of the slider is provided with a cylinder seat for connecting to an external cylinder, and the inner end is provided with a shaping part.

[0016] Furthermore, the upper punch assembly also includes an upper yoke plate, an upper punch pressing plate, an upper punch fixing plate and an upper punch guide column, the upper yoke plate is located at the top of the upper punch top plate, the upper punch fixing plate is located at the bottom of the upper punch top plate, the upper punch passes through the upper punch fixing plate and is then connected to the upper punch top plate through the upper punch pressing plate, the upper end of the upper punch guide column is fixedly connected to the upper punch top plate, and the lower end can be inserted into the guide hole on the female die and slidably connected thereto.

[0017] Furthermore, the lower punch assembly also includes a lower punch fixing plate and a lower punch guide column, the lower punch fixing plate is located on the top of the lower punch bottom plate, the lower ends of the lower punch and the lower punch guide column are fixedly connected to the lower punch bottom plate after passing through the lower punch fixing plate, and the lower punch guide column can be inserted into the guide hole on the female mold and slidably connected thereto.

[0018] Furthermore, a core rod assembly is provided below the lower punch assembly, and the core rod assembly includes a core rod bottom plate, a core rod, a core rod fixing plate, a core rod pressure plate, a core rod guide column and a lower yoke plate, the core rod fixing plate is located at the top of the core rod bottom plate, the lower ends of the core rod and the core rod guide column pass through the core rod fixing plate and are fixed to the top of the core rod bottom plate, the lower yoke plate is located at the bottom of the core rod bottom plate, the core rod pressure plate is located between the core rod and the core rod bottom plate, the upper end of the core rod guide column can be inserted into the guide holes of the lower punch bottom plate and the lower punch fixing plate from bottom to top and be slidably connected thereto, a through hole is provided in the middle part of the lower punch, and the core rod can pass through the through hole in the middle part of the lower punch from bottom to top.

[0019] Furthermore, a female mold base plate is provided under the female mold, and an opening is provided on the female mold base plate for the upper and lower pull hooks to pass through and guide and limit them. A limiting screw and a limiting column are provided at the bottom of the female mold base plate. The upper end of the limiting screw is fixedly connected to the female mold base plate, and the lower end passes through the lower die punch fixing plate and is slidably connected thereto. A limiting nut is provided at the lower end of the limiting screw. The upper end of the limiting column is fixedly connected to the female mold base plate, and the lower end is provided with a limiting portion that can contact the bottom of the core rod base plate.

[0020] The beneficial effect of the present invention is that an upper pull hook is arranged on the upper die punch assembly and a lower pull hook is arranged on the lower die punch assembly, when the upper die punch assembly and the lower die punch assembly are molded together to compact the powder, the upper pull hook and the lower pull hook will hook with each other, and then in the mold opening process, the upper die punch assembly moves upward, and at the same time, the lower die punch assembly is driven upward by the upper pull hook and the lower pull hook, thereby ejecting the compacted part model upward from the female model cavity, which can improve the mold removal efficiency and ensure the safety of the part model. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the female mold assembly of the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the upper die punch assembly of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the lower die punch assembly of the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of the powder loading assembly of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the mandrel assembly of the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the present invention when preparing to load powder;

[0028] Figure 8 It is a schematic diagram of the structure of the present invention when powder is loaded;

[0029] Fig. 9 It is a schematic diagram of the structure of the present invention during compression molding;

[0030] Fig.10 It is a structural schematic diagram of the present invention when taking a mold;

[0031] Fig.11 It is a schematic diagram of the structure of the part model pressed by the present invention;

[0032] Fig.12 It is a cross-sectional view of a part model pressed by the present invention;

[0033] The markings in the figure are as follows: 1- female die assembly, 2- upper die punch assembly, 3- lower die punch assembly, 4- powder loading assembly, 5- core rod assembly, 11- female die, 12- cavity, 13- slide groove, 14- slide block, 15- cylinder seat, 16- female die bottom plate, 17- limiting screw, 18- limiting column, 21- upper die punch top plate, 22- upper die punch, 23- upper hook, 24- upper yoke plate, 25- upper die punching plate, 26- upper die punch fixing plate, 27- upper die punch guide column, 31- Lower punch bottom plate, 32-lower punch, 33-lower pull hook, 34-lower punch fixing plate, 35-lower punch guide column, 41-powder loading bracket, 42-powder loading trough, 43-powder loading port, 44-powder delivery shoe, 45-powder inlet baffle, 46-pull hook release rod, 47-arc-shaped protrusion, 48-part ejection plate, 49-part receiving frame, 51-core rod bottom plate, 52-core rod, 53-core rod fixing plate, 54-core rod pressure plate, 55-core rod guide column, 56-lower yoke plate. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings.

[0035] like Figure 1-4 As shown, the processing die for powder metallurgy forming of the present invention comprises a female die assembly 1, an upper die punch assembly 2 and a lower die punch assembly 3;

[0036] The female mold assembly 1 includes a female mold 11, and the female mold 11 is provided with a cavity 12 that passes through the upper and lower surfaces thereof;

[0037] The upper punch assembly 2 includes an upper punch top plate 21, an upper punch 22 and an upper hook 23. The upper punch 22 is located at the bottom center of the upper punch top plate 21. The upper punch 22 can penetrate into the cavity 12 of the female die 11 from top to bottom. The upper end of the upper hook 23 is hinged to the side of the upper punch top plate 21, and the lower end is provided with a wedge-shaped hook head.

[0038] The lower punch assembly 3 includes a lower punch bottom plate 31, a lower punch 32 and a lower draw hook 33. The lower punch 32 is located at the top center of the lower punch bottom plate 31. The lower punch 32 can penetrate into the cavity 12 of the female mold 11 from bottom to top. The lower end of the lower draw hook 33 is fixed to the side of the lower punch bottom plate 31, and the upper end is provided with a wedge-shaped hook head.

[0039] When the upper punch assembly 2 moves downward, the upper hook 23 can rotate around the hinge point at its upper end under the action of the inclined surfaces of the wedge-shaped hook heads of the upper hook 23 and the lower hook 33, and then hook with the lower hook 33.

[0040] The working process of the present invention is: Figure 8 As shown, first, the upper punch assembly 2 moves upward, the upper punch 22 is separated from the female die 11, and the lower punch assembly 3 moves downward, but the lower punch 32 does not separate from the cavity 12 of the female die 11, and then metallurgical powder is loaded into the cavity 12 of the female die 11, and then the upper punch assembly 2 moves downward, and the upper punch 22 enters the cavity 12 of the female die 11, as shown in FIG. Fig. 9 As shown, the upper punch 22 and the lower punch 32 apply pressure at the same time to compress the metallurgical powder into shape in the cavity 12. At the same time, the wedge-shaped hook heads of the upper draw hook 23 and the lower draw hook 33 contact and hook each other. Finally, after the powder is formed, the upper punch assembly 2 moves upward, and then the lower punch assembly 3 is driven upward by the upper draw hook 23 and the lower draw hook 33. The lower punch 32 pushes the formed part model upward until the part model is completely pushed out of the cavity 12 of the female mold 11, and the upper punch assembly 2 stops moving. Fig.10 When the next pressing is needed, the upper draw hook 23 can be rotated to disengage the lower draw hook 33, and the lower die punch assembly 3 can move downward under the action of gravity, and the lower die punch 32 exits the cavity 12 of the female die 11, which is convenient for the next loading.

[0041] like Figure 1 , Figure 2 , Figure 5 As shown, in order to facilitate loading, the present application further adds a powder loading component 4, the powder loading component 4 includes a powder loading bracket 41 and a powder loading slot 42 slidably arranged on the powder loading bracket 41, the powder loading slot 42 is provided with a drop opening at the bottom, and its bottom is in close contact with the upper surface of the powder loading bracket 41, the female mold 11 is arranged at the bottom of one end of the powder loading bracket 41, and the powder loading bracket 41 is provided with a powder loading port 43 connected to the cavity 12 of the female mold 11. The loading process is: Figure 7 , Figure 8As shown, due to space limitations, it is inconvenient to load directly under the upper die punch assembly 2, so the powder loading trough 42 can be slid to the outside of the upper die punch assembly 2, and then the specific powder can be loaded into the powder loading trough 42, and finally it can be moved toward the female mold 11. Since the bottom of the powder loading trough 42 is in close contact with the upper surface of the powder loading bracket 41, there will be no leakage during the movement, until the powder loading trough 42 reaches the top of the powder loading port 43, the metallurgical powder enters the powder loading port 43 from the drop port, and then enters the cavity 12 of the female mold 11, thereby completing the loading process, and then the subsequent die pressing operation can be performed after the powder loading trough 42 is withdrawn. The movement of the powder loading trough 42 can be achieved by external electro-hydraulic push rods or linear motors and other components.

[0042] Further, such as Figure 5 , Figure 7 As shown, the powder loading assembly 4 also includes a powder delivery shoe 44, which is located at one end of the powder loading bracket 41 away from the female mold 11. The top of the powder delivery shoe 44 is provided with a powder inlet baffle 45 that can be slid open along its top plane. The powder loading trough 42 can slide into the powder delivery shoe 44, and its top is flush with the bottom surface of the powder inlet baffle 45, and the top opening of the powder loading trough 42 is completely blocked by the powder inlet baffle 45. When loading powder, first move the powder loading trough 42 into the powder delivery shoe 44, then open the powder inlet baffle 45, and load the metallurgical powder into the powder loading trough 42. In this process, some more powder can be appropriately loaded to make it exceed the top of the powder loading trough 42, and then push the powder inlet baffle 45. The powder inlet baffle 45 can scrape the powder in the powder loading trough 42, so as to ensure that the powder just fills the powder loading trough 42. Therefore, the powder delivery shoe 44 can quickly determine the loading amount each time, thereby improving production efficiency.

[0043] like Figure 5 , Figure 7 As shown, a hook release rod 46 is also provided on the side of the powder loading groove 42, one end of the hook release rod 46 is fixedly connected to the powder loading groove 42, and the other end is provided with an arc-shaped protrusion 47 protruding outward on a side away from the powder loading groove 42. The purpose of setting the hook release rod 46 is to facilitate the arc-shaped protrusion 47 on the hook release rod 46 to make the upper hook 23 rotate around its upper end hinge point during the next loading process after the mold is taken out, so as to disengage from the lower hook 33, so that the lower die punch 32 withdraws from the cavity 12 of the female mold 11, and facilitates the subsequent powder loading operation.

[0044] Since the space between the upper punch assembly 2 and the female mold 11 is limited, it may still be inconvenient to remove the part model even after the lower punch 32 ejects the part model out of the cavity 12. Therefore, a part ejection plate 48 is provided on the end of the powder loading trough 42 close to the female mold 11, and a part receiving frame 49 is provided on the end of the powder loading bracket 41 close to the female mold 11. Figure 8As shown, after the part model is ejected from the cavity 12 of the female mold 11, the powder loading slot 42 can be moved again, or during the next powder loading process, the part ejection plate 48 can be used to push the part model to the part receiving rack 49, thereby facilitating the removal of the part model.

[0045] For the female mold assembly 1, the cavity 12 of the existing female mold 11 is generally a relatively regular cylindrical or polygonal prism, and there is no way to press some parts with small necks, such as Fig.11 Therefore, in order to be able to press the parts with necks, the present application provides slide grooves 13 connected to the middle cavity 12 on opposite sides of the female mold 11, as shown in FIG. Figure 2 As shown, a slider 14 is slidably arranged in the slide groove 13, and a cylinder seat 15 for connecting to an external oil cylinder is arranged at the outer end of the slider 14, and a shaping part is arranged at the inner end. Before powder filling or during die pressing, the two sliders 14 can be pressed inwardly to press out a neck on the part model using the shaping part at the inner end, and then the slider 14 is withdrawn first, and then the die removal operation is performed to obtain the following. Figure 1 Part model with neck shown.

[0046] For the upper punch component 2, as Figure 3 As shown, the upper punch assembly 2 also includes an upper yoke plate 24, an upper punch pressing plate 25, an upper punch fixing plate 26 and an upper punch guide column 27. The upper yoke plate 24 is located at the top of the upper punch top plate 21, and the upper punch fixing plate 26 is located at the bottom of the upper punch top plate 21. The upper punch 22 passes through the upper punch fixing plate 26 and is then connected to the upper punch top plate 21 through the upper punch pressing plate 25. The upper end of the upper punch guide column 27 is fixedly connected to the upper punch top plate 21, and the lower end can be inserted into the guide hole on the female mold 11 and slidably connected thereto. The upper yoke plate 24 is used to connect an external driving mechanism so as to apply a force to the upper punch assembly 2. The upper punch fixing plate 26 is used to fix the upper punch 22 and the upper punch guide column 27, and the upper punch guide column 27 is used to increase stability during the die pressing process. The upper punch pressing plate 25 is made of high-strength steel so as to withstand the huge pressure during the die pressing process.

[0047] For the lower punch component 3, as Figure 4 As shown, the lower punch assembly 3 also includes a lower punch fixing plate 34 and a lower punch guide pin 35. The lower punch fixing plate 34 is located on the top of the lower punch bottom plate 31. The lower punch 32 and the lower punch guide pin 35 are fixedly connected to the lower punch bottom plate 31 after passing through the lower punch fixing plate 34. The lower punch guide pin 35 can be inserted into the guide hole on the female mold 11 and slidably connected thereto. Similarly, the lower punch fixing plate 34 is used to fix the lower punch 32 and the lower punch guide pin 35, and the lower punch guide pin 35 is used to increase the stability during the die pressing process.

[0048] For some parts with more complex structures, such as Fig.11 Add a blind hole to the bottom of the part shown. Fig.12 For the pressing of such parts, the present application also provides a core rod assembly 5 below the lower punch assembly 3, as shown in FIG. Figure 6 As shown, the mandrel assembly 5 includes a mandrel bottom plate 51, a mandrel 52, a mandrel fixing plate 53, a mandrel pressing plate 54, a mandrel guide column 55 and a lower yoke plate 56. The mandrel fixing plate 53 is located at the top of the mandrel bottom plate 51. The lower ends of the mandrel 52 and the mandrel guide column 55 pass through the mandrel fixing plate 53 and are fixed to the top of the mandrel bottom plate 51. The lower yoke plate 56 is located at the bottom of the mandrel bottom plate 51. The mandrel pressing plate 54 is located between the mandrel 52 and the mandrel bottom plate 51. The upper end of the mandrel guide column 55 can pass through the guide holes of the lower punch bottom plate 31 and the lower punch fixing plate 34 from bottom to top and be slidably connected thereto. A through hole is provided in the middle of the lower punch 32. The mandrel 52 can pass through the through hole in the middle of the lower punch 32 from bottom to top. The entire die pressing process is as follows: Fig. 9 As shown, the external driving mechanism drives the lower yoke plate 56 to move upward. During the movement, the core rod fixing plate 53 first contacts the lower die punch bottom plate 31. At this time, the core rod 52 passes through the lower die punch 32, and the core rod upper end 52 cooperates with the upper end of the lower die punch 32 to form the bottom contour of the part model. Then, the core rod bottom plate 51 continues to drive the lower die punch 32 to move upward, thereby completing the die pressing operation. After the die pressing is completed, the driving mechanism drives the core rod bottom plate 51 to move downward, as shown in FIG. Fig.10 As shown, the core rod 52 is separated from the part model without affecting the subsequent mold removal process.

[0049] Furthermore, in order to conveniently limit the moving range of the lower punch assembly 3 and the core rod assembly 5, a female mold bottom plate 16 is further provided below the female mold 1. Figure 2 As shown, the female mold bottom plate 16 is provided with an opening for the upper hook 23 and the lower hook 33 to pass through and guide and limit them, so as to ensure the reliability of the connection and subsequent movement of the two. The bottom of the female mold bottom plate 16 is provided with a limit screw 17 and a limit column 18. The upper end of the limit screw 17 is fixedly connected to the female mold bottom plate 16, and the lower end passes through the lower die punch fixing plate 34 and is slidably connected thereto. The lower end of the limit screw 17 is provided with a limit nut. When the lower die punch assembly 3 moves down to contact with the limit nut, it can no longer move. At this time, it can also ensure that the lower die punch 32 will not separate from the cavity 12 of the female mold 11. Figure 8 The upper end of the limiting column 18 is fixedly connected to the female die bottom plate 16, and the lower end is provided with a limiting portion that can contact the bottom of the core rod bottom plate 51. When the core rod assembly 5 moves downward, it moves at most until the core rod bottom plate 51 contacts the limiting portion, so as to prevent the core rod 52 from being separated from the lower die punch 32. Figure 8The limiting screw 17 and the limiting column 18 can ensure the tightness of the connection of each component, facilitate the rapid mold closing and demoulding operations, and improve production efficiency.

Claims

1. A processing mold for powder metallurgy forming, characterized by: It comprises a female die assembly (1), an upper die punch assembly (2) and a lower die punch assembly (3); The female mold assembly (1) comprises a female mold (11), and the female mold (11) is provided with a mold cavity (12) penetrating the upper and lower surfaces thereof; The upper die punch assembly (2) comprises an upper die punch top plate (21), an upper die punch (22) and an upper draw hook (23); the upper die punch (22) is located at the bottom center of the upper die punch top plate (21); the upper die punch (22) can penetrate into the cavity (12) of the female die (11) from top to bottom; the upper end of the upper draw hook (23) is hinged to the side of the upper die punch top plate (21), and the lower end is provided with a wedge-shaped hook head; The lower die punch assembly (3) comprises a lower die punch bottom plate (31), a lower die punch (32) and a lower draw hook (33); the lower die punch (32) is located at the top center of the lower die punch bottom plate (31); the lower die punch (32) can penetrate into the cavity (12) of the female die (11) from bottom to top; the lower end of the lower draw hook (33) is fixed to the side of the lower die punch bottom plate (31), and the upper end is provided with a wedge-shaped hook head; When the upper punch assembly (2) moves downward, the upper hook (23) can rotate around the hinge point at its upper end under the action of the inclined surfaces of the wedge-shaped hook heads of the upper hook (23) and the lower hook (33), and then hook with the lower hook (33); The upper punch assembly (2) further comprises an upper yoke plate (24), an upper punch pressing plate (25), an upper punch fixing plate (26) and an upper punch guide column (27), wherein the upper yoke plate (24) is located at the top of the upper punch top plate (21), the upper punch fixing plate (26) is located at the bottom of the upper punch top plate (21), the upper punch (22) passes through the upper punch fixing plate (26) and is then connected to the upper punch top plate (21) via the upper punch pressing plate (25), the upper end of the upper punch guide column (27) is fixedly connected to the upper punch top plate (21), and the lower end can pass through the guide hole on the female die (11) and be slidably connected thereto; The lower punch assembly (3) further comprises a lower punch fixing plate (34) and a lower punch guide pin (35), wherein the lower punch fixing plate (34) is located on the top of the lower punch bottom plate (31), the lower ends of the lower punch (32) and the lower punch guide pin (35) pass through the lower punch fixing plate (34) and are fixedly connected to the lower punch bottom plate (31), and the lower punch guide pin (35) can penetrate into the guide hole on the female die (11) and be slidably connected thereto; A core rod assembly (5) is also provided below the lower die punch assembly (3), the core rod assembly (5) comprising a core rod bottom plate (51), a core rod (52), a core rod fixing plate (53), a core rod pressure plate (54), a core rod guide column (55) and a lower yoke plate (56), the core rod fixing plate (53) being located on the top of the core rod bottom plate (51), the lower ends of the core rod (52) and the core rod guide column (55) passing through the core rod fixing plate (53) and being fixed to the core rod bottom plate (51). The lower yoke plate (56) is located at the bottom of the core rod bottom plate (51), the core rod pressure plate (54) is located between the core rod (52) and the core rod bottom plate (51), the upper end of the core rod guide column (55) can penetrate from bottom to top into the guide holes of the lower punch bottom plate (31) and the lower punch fixing plate (34) and be slidably connected thereto, and a through hole is provided in the middle of the lower punch (32), and the core rod (52) can pass through the through hole in the middle of the lower punch (32) from bottom to top.

2. The processing mold for powder metallurgy molding according to claim 1, characterized in that: The invention also comprises a powder loading assembly (4), the powder loading assembly (4) comprising a powder loading bracket (41) and a powder loading groove (42) slidably arranged on the powder loading bracket (41), the powder loading groove (42) having a material drop opening at the bottom, and the bottom of the powder loading groove (42) being in close contact with the upper surface of the powder loading bracket (41), the female mold (11) being arranged at the bottom of one end of the powder loading bracket (41), and the powder loading bracket (41) being provided with a powder loading opening (43) which is in communication with the mold cavity (12) of the female mold (11).

3. The processing mold for powder metallurgy molding as claimed in claim 2, characterized in that: The powder loading assembly (4) further comprises a powder delivery shoe (44), the powder delivery shoe (44) being located at one end of the powder loading bracket (41) away from the female mold (11), a powder inlet baffle (45) being provided at the top of the powder delivery shoe (44) and being able to slide open along the top plane thereof, the powder loading groove (42) being able to slide into the powder delivery shoe (44), the top of which is flush with the bottom surface of the powder inlet baffle (45), and the top opening of the powder loading groove (42) being completely blocked by the powder inlet baffle (45).

4. The processing mold for powder metallurgy molding as claimed in claim 2, characterized in that: A hook release rod (46) is provided on the side of the powder loading groove (42), one end of the hook release rod (46) is fixedly connected to the powder loading groove (42), and the other end is provided with an outwardly protruding arc-shaped protrusion (47) on the side away from the powder loading groove (42). When the powder loading groove (42) moves toward the female mold (11), the arc-shaped protrusion (47) on the hook release rod (46) can make the upper hook (23) rotate around its upper end hinge point, thereby disengaging from the lower hook (33).

5. The processing mold for powder metallurgy molding as claimed in claim 2, characterized in that: A part ejection plate (48) is provided on one end of the powder loading groove (42) close to the female mold (11), and a part receiving frame (49) is provided on one end of the powder loading support (41) close to the female mold (11). When the powder loading groove (42) moves to just above the powder loading port (43), the part ejection plate (48) can extend into the part receiving frame (49).

6. The processing mold for powder metallurgy molding according to claim 1, characterized in that: The female mold (11) has two opposite sides provided with a slide groove (13) connected to the mold cavity (12) in the middle, a slider (14) is slidably arranged in the slide groove (13), and the outer end of the slider (14) is provided with a cylinder seat (15) for connecting to an external cylinder, and the inner end is provided with a shaping portion.

7. The processing mold for powder metallurgy molding according to claim 1, characterized in that: A female die bottom plate (16) is also provided below the female die (11). The female die bottom plate (16) is provided with an opening for the upper draw hook (23) and the lower draw hook (33) to pass through and guide and limit them. A limiting screw (17) and a limiting column (18) are provided at the bottom of the female die bottom plate (16). The upper end of the limiting screw (17) is fixedly connected to the female die bottom plate (16), and the lower end passes through the lower die punch fixing plate (34) and is slidably connected thereto. A limiting nut is provided at the lower end of the limiting screw (17). The upper end of the limiting column (18) is fixedly connected to the female die bottom plate (16), and the lower end is provided with a limiting portion capable of contacting the bottom of the core rod bottom plate (51).

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