Metal powder forming device for gear production

Abstract

The present application belongs to the field of metal powder forming, and discloses a metal powder forming device for gear production, which comprises an upper die, a clutch arranged between the upper die and a lower die, an upper end of the clutch being detachably embeddedly connected with the upper die and being capable of rotating synchronously with the upper die, and a lower end of the clutch being rotationally connected with the lower die through a rotating part. The device provides a movable forming environment for the straight tooth part and the helical tooth part of the double gear section through the cooperative design of the detachable upper die, the lower die and the intermediate clutch. In the pressing process, the upper die can freely rotate under the driving of an upper punch to form a helical tooth shape, while the lower die is limited to only axial movement to form a straight tooth. The clutch serves as the center of motion conversion and force transmission, realizes the decoupling and linkage of rotary motion and linear motion, and thus simultaneously meets the different requirements of the two kinds of tooth shapes on the forming motion in a single process.

Description

Technical Field

[0001] This disclosure pertains to the field of metal powder forming, and specifically relates to a metal powder forming apparatus for gear production. Background Technology

[0002] Metal powder forming technology is one of the important processes for manufacturing high-precision, high-performance mechanical parts, especially suitable for components with complex structures such as gear segments that require high density and high strength. This technology involves filling metal powder into a mold cavity, forming it under bidirectional or unidirectional pressure, and then sintering to densify it, ultimately obtaining a near-net-shape part. It has advantages such as high material utilization, excellent mechanical properties, and the ability to form complex geometries.

[0003] In the field of gear segment manufacturing, metal powder forming technology has been widely used in the production of various spur gear segments, helical gear segments, and bevel gear segments. However, for double gear segments composed of different tooth profiles—typically including helical gear segments and spur gear segments—existing forming processes face significant technical bottlenecks.

[0004] The integrated molding of the double gear segment requires simultaneously satisfying the helical motion requirements of the helical gear segment and the linear motion requirements of the spur gear segment, which presents a fundamental kinematic contradiction. Specifically:

[0005] Motion mode conflict: The helical gear section requires the forming punch to perform a combined rotational and linear motion matching the helix angle during pressing and demolding; while the spur gear section only requires pure axial linear motion. If an integral mold and punch are used for synchronous pressing, the rotational force acting on the helical gear section will be transmitted to the spur gear section area through the powder, causing the mold to jam, shearing damage to the inside of the green body, and even mold damage. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this disclosure is to provide a metal powder forming device for gear production, which solves the risk of mold jamming caused by the contradiction between the forming motion modes of the spur and helical gear segments in the prior art.

[0007] The objective of this disclosure can be achieved through the following technical solutions:

[0008] A metal powder forming apparatus for gear production includes: an upper mold having a cavity that matches the shape of a helical gear segment to be formed;

[0009] The lower mold has a cavity that matches the shape of the spur gear section to be formed, and the lower mold and the upper mold are separate structures;

[0010] An upper punch is positioned above the upper mold and is used to apply pressure to the cavity of the upper mold and drive the upper mold to rotate.

[0011] A lower punch is positioned below the lower die and is used to apply pressure to the cavity of the lower die.

[0012] A clutch is disposed between the upper mold and the lower mold; the upper end of the clutch is separably engaged with the upper mold and can rotate synchronously with the upper mold; the lower end of the clutch is rotatably connected to the lower mold through a rotating part.

[0013] In some disclosures, the clutch includes an insert, and the outer wall shape of the insert is adapted to the cavity of the upper mold.

[0014] In some disclosures, a base is provided on the outer side of the upper mold, and a through hole is provided on the inner side of the base. The upper mold is located inside the through hole, and the outer wall of the upper mold is rotatably connected to the inner wall of the through hole.

[0015] In some disclosures, the lower end face of the lower punch is provided with a first pusher, and the cross-sectional area of ​​the lower punch is adapted to the cross-sectional area of ​​the lower mold cavity, and the first pusher drives the lower punch to move vertically upward and can penetrate the lower mold.

[0016] In some disclosures, the lower end face of the embedded part is fixed with a flange, and the lower end face of the flange is provided with a second pusher, and the first pusher and the second pusher are controlled separately.

[0017] In some disclosures, the rotating part allows the clutch to rotate about an axial direction relative to the lower die, while also allowing the clutch and the lower die to move together in the axial direction.

[0018] In some disclosures, a cylindrical groove is provided in the middle of the clutch, and the outer wall of the lower mold is in contact with the inner wall of the cylindrical groove, and the lower mold can slide vertically along the cylindrical groove.

[0019] In some disclosures, a vertical part is fixed to the lower end face of the lower die, and a limiting part is fixed to the end of the vertical part. The limiting part is located on the moving path of the lower punch, and a limiting groove adapted to the limiting part is provided on the inner side of the lower punch.

[0020] In some disclosures, the downward movement path of the lower mold is greater than the height of the spur gear segment in the double gear segment.

[0021] In some disclosures, a sealing cavity is slidably provided on the upper end surface of the base, and a feeding pump is connected to the outside of the sealing cavity. A movable part is provided at the end of the sealing cavity near the upper mold.

[0022] The explanations of the nouns, conjunctions, or adjectives used in the above technical solutions are as follows:

[0023] A fixed connection refers to a connection in which parts or components are fixed in place and there is no relative movement between them;

[0024] A rotating connection is a connection between parts that allows the parts to rotate relative to each other.

[0025] Threaded connections are a type of detachable fixed connection with advantages such as simple structure, reliable connection, and convenient assembly and disassembly. They are widely used in mechanical engineering and connection structure fields.

[0026] A sliding connection is a connection between parts that allows the parts to slide against each other.

[0027] The beneficial effects of this disclosure are:

[0028] 1. The device creatively provides a movable forming environment for the spur and helical gear sections of the double-gear segment through the coordinated design of a separate upper die, lower die, and intermediate clutch. During the pressing process, the upper die can rotate freely under the drive of the upper punch to form helical teeth, while the lower die is restricted to axial movement only to form spur teeth. The clutch, as the central hub for motion conversion and force transmission, achieves the decoupling and linkage of rotary and linear motion, thereby simultaneously satisfying the different forming motion requirements of the two tooth profiles in a single process.

[0029] 2. The lower end face of the clutch is equipped with a separate upward driving force, while the spiral downward pressure of the upper punch and the linear upward thrust of the lower punch create opposing bidirectional pressure. In the engagement area of ​​the spur and helical teeth, this area simultaneously bears the combined pressure from both the upper and lower punches, transforming it from a "weak connection" in traditional processes into a fully compacted "high-pressure zone." This results in not only higher density at the engagement point but also significantly improved engagement strength and fatigue resistance in this area.

[0030] 3. When the cavity area of ​​the upper mold is greater than the cross-sectional area of ​​the lower end of the double gear segment blank, the double gear segment blank is removed from the upper mold by setting a moving part on the original transverse coating equipment so that the lower end surface of the double gear segment is kept higher than the upper end surface of the upper mold. This reduces the risk of the spur gear segment embedding or scraping the mold due to simple transverse movement. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this disclosure;

[0033] Figure 2This is a schematic diagram of the overall structure from another perspective of an embodiment of this disclosure;

[0034] Figure 3 This is a schematic diagram of the overall structure of the upper punch, upper mold, lower mold and lower punch according to an embodiment of the present disclosure;

[0035] Figure 4 This is an embodiment of the present disclosure. Figure 3 A schematic diagram of the overall structure from another perspective;

[0036] Figure 5 This is an embodiment of the present disclosure. Figure 4 A schematic diagram of the explosion structure hidden behind the upper punch;

[0037] Figure 6 This is an embodiment of the present disclosure. Figure 4 A schematic diagram of the internal structure after the upper punch is hidden.

[0038] In the diagram: 1. Upper mold; 2. Lower mold; 3. Clutch; 31. Embedded part; 32. Flange; 33. Cylindrical groove; 4. Upper punch; 5. Lower punch; 51. First pusher; 52. Second pusher; 53. Limiting groove; 6. Base; 61. Through hole; 7. Rotating part; 8. Vertical part; 81. Limiting part; 9. Sealing cavity; 91. Moving part; 10. Feeding pump Detailed Implementation

[0039] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0040] Please refer to Figures 1 to 6 A metal powder forming apparatus for gear production includes: an upper mold 1 having a cavity that matches the shape of the helical gear segment to be formed;

[0041] The lower mold 2 has a cavity that matches the shape of the spur gear segment to be formed, and the lower mold 2 and the upper mold 1 are separate structures.

[0042] The upper punch 4 is positioned above the upper mold 1 and is used to apply pressure to the cavity of the upper mold 1 and drive the upper mold 1 to rotate.

[0043] The lower punch 5 is located below the lower mold 2 and is used to apply pressure to the cavity of the lower mold 2;

[0044] The clutch 3 is disposed between the upper mold 1 and the lower mold 2; the upper end of the clutch 3 is separably engaged with the upper mold 1 and can rotate synchronously with the upper mold 1; the lower end of the clutch 3 is rotatably connected to the lower mold 2 through the rotating part 7.

[0045] In use, the upper punch 4 and lower punch 5 are positioned vertically corresponding to the upper mold 1 and lower mold 2, respectively. During the extrusion molding of metal powder, the upper punch 4 is embedded in the upper mold 1, and the lower punch 5 moves upward and embeds itself in the lower mold 2. Simultaneously, the upper end of the clutch 3 is embedded in the upper mold 1. As the upper punch 4 and lower punch 5 move towards each other, the upper punch 4, when embedded in the upper mold 1, causes the upper mold 1 to rotate. During this process, because the upper end of the clutch 3 is embedded in the upper mold 1, the clutch 3 rotates synchronously with the upper mold 1. The clutch 3 is rotatably connected to the lower mold 2. Constrained by the axis of the lower punch 5, it does not rotate circumferentially. During this process, the spur gear section of the double gear segment is formed in the lower die 2, while the helical gear section is extruded in the upper die 1. During extrusion, the coupling and the lower die 2 can move together in the axial direction. Therefore, the lower punch 5 drives the lower die 2 and the clutch 3 to move vertically upwards, while the upper punch 4 spirals downwards along the side wall of the helical gear segment, causing the metal powder to simultaneously bear the extrusion forces from both the upper and lower sides. For both the helical and spur gear segments, the pressure is transmitted from both ends to the central region, making the density distribution of the entire part symmetrical and uniform. This improves the overall strength and consistency of the part.

[0046] Furthermore, the lower punch 5 actively applies pressure upwards to the lower end face of the helical gear segment, essentially applying pressure directly to the large gear segment from the bottom. The connection point is simultaneously subjected to pressure from both the upper punch 4 and the lower punch 5, becoming a "high-pressure zone" rather than a "low-pressure zone." This ensures that the connection point achieves sufficient or even higher compaction density, thereby improving the strength and fatigue resistance of the connection between the helical gear segment and the spur gear segment.

[0047] Please refer to Figures 5 to 6 The clutch 3 includes an insert 31, and the outer wall shape of the insert 31 is adapted to the cavity of the upper mold 1.

[0048] In use, the clutch 3 is directly inserted into the cavity of the upper mold 1 through the insert part 31, and the upper punch 4 is also inserted into the cavity of the upper mold 1. The upper end face of the clutch 3 and the upper punch 4 are correspondingly squeezed to compress the metal powder. The upper end face of the insert part 31 directly serves as the lower end forming surface of the helical gear segment to be formed. At this time, true bidirectional compaction is achieved in the helical gear segment. The upper end face of the insert part 31 directly serves as the lower boundary of the helical gear segment and the connection between the helical gear segment and the spur gear segment is located in the middle part of the upper punch 4 and the lower punch 5. The upper and lower ends of the metal powder apply pressure to the metal powder at the same time, thereby increasing the bonding strength at the connection between the helical gear segment and the spur gear segment.

[0049] Furthermore, the insert 31 is directly inserted into the cavity of the upper mold 1, so that the insert 31 serves as the lower boundary of the cavity. Its upward extrusion motion helps to drive the metal powder to fill the tooth profile space of the helical gear segment more fully, especially the tooth root near the connection area. This reduces filling defects or uneven density caused by poor powder flow, which is beneficial to improving the integrity of the helical gear segment tooth profile.

[0050] A base 6 is provided on the outer side of the upper mold 1, and a through hole 61 is provided on the inner side of the base 6. The upper mold 1 is located inside the through hole 61, and the outer wall of the upper mold 1 is rotatably connected to the inner wall of the through hole 61.

[0051] Metal powder is filled in the cavity between the upper mold 1, the lower mold 2 and the clutch 3. The upper mold 1 can rotate coaxially around the central axis of the through hole 61. During compression, both the upper punch 4 and the insert 31 need to enter the cavity of the upper mold 1. The insert 31 does not rotate automatically to adapt to the cavity of the upper mold 1. After the upper punch 4 enters the cavity of the upper mold 1, the upper punch 4 rotates and drives the upper edge of the through hole 61 to rotate, so as to adjust the angle of the upper mold 1 so that the lower mold 2 can be inserted into the upper mold 1.

[0052] Please refer to Figure 6 The lower end face of the lower punch 5 is provided with a first pusher 51, and the cross-sectional area of ​​the lower punch 5 is adapted to the cross-sectional area of ​​the cavity of the lower mold 2. The first pusher 51 drives the lower punch 5 to move vertically upward and can penetrate the lower mold 2.

[0053] In use, the first pusher 51 drives the lower punch 5 to move vertically upward, and the lower punch 5 is vertically aligned with the upper punch 4. Therefore, the upper punch 4 and the lower punch 5 simultaneously press the metal powder located in the cavity of the lower mold 2 from the upper and lower ends of the metal powder.

[0054] Furthermore, the lower punch 5 can penetrate the lower mold 2, making it easy to eject the formed double gear segment from the mold.

[0055] Please refer to Figures 3 to 6 The lower end face of the embedded part 31 is fixed with a flange 32, and the lower end face of the flange 32 is provided with a second pusher 52. A support plate is provided between the second pusher 52 and the flange 32, and the lower end of the support plate is provided with a protrusion. The first pusher 51 and the second pusher 52 are controlled separately.

[0056] In use, the second pusher 52 drives the flange 32 and the insert 31 to move upward, thereby driving the clutch 3 to be inserted into the upper mold 1. The first pusher 51 and the second pusher 52 together constitute the force of the metal powder being pressed by the lower end face of the metal powder.

[0057] Furthermore, the first pusher 51 and the second pusher 52 are two independent hydraulic components, allowing independent control of the rising height of the insert 31 and the lower punch 5. This facilitates the demolding of the double gear segment. During the demolding stage, the independent control capability allows for an optimized "core removal first, ejection later" sequence. First, the second pusher 52 can be controlled to retract the insert 31 downwards, completely separating it from the formed gear segment shaft hole, thus releasing the circumferential constraint of the mandrel on the gear segment blank. Then, the first pusher 51 is controlled to push the main lower punch 5 to eject the gear segment blank. This sequential operation effectively avoids the risk of twisting or scratching the gear segment blank due to mandrel fixation in traditional demolding, significantly improving demolding quality and blank integrity. Furthermore, the clutch 3 and the lower punch 5 are controlled independently, allowing adjustment of their relative heights to control the height of the spur gear segment, thus accommodating the production of double gear segments of various sizes.

[0058] Please refer to Figures 5 to 6 The rotating part 7 allows the clutch 3 to rotate axially relative to the lower mold 2, while also allowing the clutch 3 and the lower mold 2 to move together axially.

[0059] Please refer to Figures 5 to 6 The clutch 3 has a cylindrical groove 33 in the middle, and the outer wall of the lower mold 2 is in contact with the inner wall of the cylindrical groove 33. The lower mold 2 can slide vertically along the cylindrical groove 33.

[0060] In use, the lower mold 2 and the upper mold 1 can slide in opposite directions along their axes, and the upper mold 1 and the lower mold 2 have a separable structure. This allows the lower mold 2 to move vertically downwards during demolding of the double gear segment, separating the spur gear segment from the lower mold 2. After the upper punch 4 separates from the upper mold 1, it drives the pressed double gear segment upwards via the first pusher 51. Meanwhile, the helical gear segment on the double gear segment moves upwards along the inner cavity of the upper mold 1. Since the upper mold 1 has circumferential rotational freedom, it passively and synchronously rotates during the upward movement of the double gear segment. This transforms the harmful sliding friction between the helical gear segment and the upper mold 1 into a coordinated rotation driven by the helical gear segment, significantly reducing frictional resistance and shear stress during demolding. This effectively reduces scratches and wear on the helical tooth surface, helping to maintain the geometric accuracy and surface integrity of the helical tooth profile.

[0061] Furthermore, after the spur gear segment disengages from the lower mold 2, the lower end face of the helical gear segment abuts against the upper end face of the clutch 3 to prevent the double gear segment from leaving the upper mold 1. At the same time, the lower end of the double gear segment is located in the cylindrical groove 33, and there is a gap between the inner wall of the cylindrical groove 33 and the outer edge of the double gear segment. Therefore, when the double gear segment rotates, it will not be obstructed by the meshing of the teeth of the spur gear segment with the outside.

[0062] Please refer to Figures 3 to 6 The lower end face of the lower mold 2 is fixed with a vertical part 8, and the end of the vertical part 8 is fixed with a limiting part 81. The limiting part 81 is located on the moving path of the lower punch 5, and the inner side of the lower punch 5 is provided with a limiting groove 53 that is adapted to the limiting part 81.

[0063] During the blanking process, when the lower die 2 needs to be removed from the spur gear section, the lower punch 5 abuts against the limiting part 81. As the lower punch 5 moves downwards, it continues to abut against the limiting part 81, thereby causing the lower die 2 to move vertically downwards until it separates from the spur gear section. The downward movement of the lower punch 5 provides the initial power to separate the lower die 2 from the spur gear section. The return motion of the lower punch 5 drive mechanism is used directly as the power source, eliminating the need for an additional independent structure for the separation of the lower die 2. This simplifies the overall mechanical structure and reduces manufacturing costs and maintenance complexity. Then, the insert 31 is removed from the cavity of the upper die 1. At this time, the lower punch 5 moves upwards, causing the double gear section to move out of the upper die 1.

[0064] Of course, the lower mold 2 part can also be equipped with a separate drive source, such as an electric telescopic rod, which can directly control the lifting and lowering of the lower mold 2 so as to facilitate the removal of the blank from the spur gear section of the double gear section. If so, the limiting part 81 and the limiting groove 53 are not needed.

[0065] Please refer to Figure 6 The downward movement path of the lower mold 2 is greater than the height of the spur gear segment in the double gear segment.

[0066] This allows the lower mold 2 to completely detach from all the tooth profiles of the spur gear segment, creating a clear, non-contact upward channel for the spur gear segment. This avoids secondary contact or scraping between the tooth tip or tooth side of the spur gear segment and the cavity of the lower mold 2 during subsequent ejection.

[0067] Please refer to Figures 1 to 2 A sealing cavity 9 is slidably provided on the upper end surface of the base 6, and a feeding pump 10 is connected to the outside of the sealing cavity 9. A moving part 91 is provided at the end of the sealing cavity 9 near the upper mold 1.

[0068] The movable component 91 is used to move the double gear segment blank that has been lifted out of the upper mold 1 with the lower end face of the spur gear segment higher than the upper end face of the upper mold 1.

[0069] The projected height of the end of the moving part 91 and the upper surface of the base 6 is greater than the height of the spur gear section in the double gear segment. The moving base includes two support rods symmetrically arranged on the vertical center surface of the mold 2 below. The distance between the two support rods is greater than the maximum diameter of the spur gear section in the double gear segment blank and less than the maximum diameter of the helical gear section in the double gear segment blank. Therefore, the double gear segment blank can be supported on the two support rods. At this time, the height of the double gear segment is higher than the upper surface of the base 6. Since the lower surface of the double gear segment blank is only conveyed upward by the lower punch 5, and the cavity area of ​​the upper mold 1 is much larger than the cross-sectional area of ​​the spur gear section in the double gear segment blank, when the double gear segment leaves the upper mold 1, it is only subjected to horizontal thrust, which easily causes the spur gear section of the double gear segment to get stuck in the gap between the lower punch 5 and the cavity of the upper mold 1, and to be damaged under the action of the horizontal thrust of the sealing cavity 9.

[0070] Of course, in some embodiments, a clamping arm with upward pulling force can also be provided separately to prevent the double gear segment blank from getting stuck in the cavity of the upper mold 1;

[0071] Of course, it can also be removed manually.

[0072] However, compared to the method of removing by a robotic arm, the moving rod only needs to be bonded with two moving parts 91 with upward supporting force on the existing technology, which can maintain the traditional feeding method of ordinary spur gear segment or helical gear segment and the moving path or method of the sealing cavity 9 during demolding.

[0073] The working principle of a metal powder forming device for gear production is as follows:

[0074] Powder loading and mold closing: The sealing cavity 9 moves above the mold, and the feeding pump 10 fills the cavity formed by the upper mold 1, the clutch 3 (embedded part 31), and the lower mold 2 with metal powder. Subsequently, the sealing cavity 9 is removed. The second pusher 52 pushes the clutch 3 upward, so that the embedded part 31 is inserted into the bottom of the cavity of the upper mold 1; at the same time, the upper punch 4 begins to rotate and press down, entering the cavity of the upper mold 1.

[0075] The upper punch 4 presses down along a spiral trajectory, causing the upper mold 1 to rotate synchronously, forming the helical gear segment. Simultaneously, the first propeller 51 pushes the lower punch 5, and the second propeller 52 pushes the clutch 3 to move upwards in coordination, axially compacting the powder in the cavity from the bottom, forming the spur gear segment. During this process, the clutch 3 rotates with the upper mold 1, but the rotational motion is decoupled from the lower mold 2 by the rotating part 7, ensuring that the lower mold 2 and the spur gear segment area only experience axial movement. The powder is densified under bidirectional pressure, especially forming a high-pressure zone at the connection area between the helical and spur gears, ensuring bonding strength.

[0076] Demolding preparation (sequential demolding):

[0077] After pressing is completed, the upper punch 4 rotates and disengages from the cavity of the upper mold 1. The second pusher 52 first drives the clutch 3 (embedded part 31) to retract downward until the clutch 3 disengages from the upper mold 1.

[0078] Lower die separation: The first pusher 51 drives the lower punch 5 to move downward. Through the cooperation of the limiting groove 53 and the limiting part 81, the lower die 2 moves downward together until the lower die 2 completely separates from all the tooth profiles of the spur gear section.

[0079] The first pusher 51 drives the lower punch 5 to move upward, lifting the formed double gear blank upward. The helical gear section of the blank rises in the spiral cavity of the upper mold 1 and passively drives the upper mold 1 to rotate, so as to reduce the situation of mutual jamming between the two.

[0080] When the blank is lifted until the lower end face of its spur gear section is higher than the upper end face of the upper mold 1, the moving part 91 (support rod) extends horizontally under the blank and supports the bottom of the helical gear section. Subsequently, the sealing cavity 9 or the transfer mechanism drives the moving part 91 to move horizontally out, smoothly moving the blank away from the mold area. This lifting and transfer method completely avoids interference and scratching between the spur gear section and the cavity opening of the upper mold 1.

[0081] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] The foregoing has shown and described the basic principles, main features, and advantages of this disclosure. Those skilled in the art should understand that this disclosure is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this disclosure. Various changes and modifications can be made to this disclosure without departing from its spirit and scope, and all such changes and modifications fall within the scope of this disclosure as claimed.

Claims

1. A metal powder forming apparatus for gear production, characterized in that, include: Upper mold (1) has a cavity that matches the shape of the helical gear segment to be formed; The lower mold (2) has a cavity that matches the shape of the spur gear segment to be formed, and the lower mold (2) and the upper mold (1) are separate structures; The upper punch (4) is located above the upper mold (1) and is used to apply pressure to the cavity of the upper mold (1) and drive the upper mold (1) to rotate. The lower punch (5) is located below the lower mold (2) and is used to apply pressure to the cavity of the lower mold (2); The clutch (3) is disposed between the upper mold (1) and the lower mold (2); the upper end of the clutch (3) is separably engaged with the upper mold (1) and can rotate synchronously with the upper mold (1); the lower end of the clutch (3) is rotatably connected to the lower mold (2) through a rotating part (7); The clutch (3) has a cylindrical groove (33) in the middle, and the outer wall of the lower mold (2) is in contact with the inner wall of the cylindrical groove (33). The lower mold (2) can slide in the vertical direction along the cylindrical groove (33). The clutch (3) includes an insert (31), and the outer wall shape of the insert (31) is adapted to the cavity of the upper mold (1).

2. The metal powder forming apparatus for gear production according to claim 1, characterized in that, The upper mold (1) is provided with a base (6) on its outer side, and a through hole (61) is provided through the inner side of the base (6). The upper mold (1) is located inside the through hole (61), and the outer wall of the upper mold (1) is rotatably connected to the inner wall of the through hole (61).

3. The metal powder forming apparatus for gear production according to claim 1, characterized in that, The lower end face of the lower punch (5) is provided with a first pusher (51), and the cross-sectional area of ​​the lower punch (5) is adapted to the cross-sectional area of ​​the cavity of the lower mold (2). The first pusher (51) drives the lower punch (5) to move vertically upward and can penetrate the lower mold (2).

4. The metal powder forming apparatus for gear production according to claim 3, characterized in that, The lower end face of the embedded part (31) is fixed with a flange (32), and the lower end face of the flange (32) is provided with a second pusher (52), and the first pusher (51) and the second pusher (52) are controlled separately.

5. The metal powder forming apparatus for gear production according to claim 1, characterized in that, The rotating part (7) allows the clutch (3) to rotate about the axial direction relative to the lower mold (2), while allowing the clutch (3) and the lower mold (2) to move together in the axial direction.

6. The metal powder forming apparatus for gear production according to claim 5, characterized in that, The lower end face of the lower mold (2) is fixed with a vertical part (8), and the end of the vertical part (8) is fixed with a limiting part (81). The limiting part (81) is located on the moving path of the lower punch (5), and the inner side of the lower punch (5) is provided with a limiting groove (53) that is adapted to the limiting part (81).

7. A metal powder forming apparatus for gear production according to claim 6, characterized in that, The downward movement path of the lower mold (2) is greater than the height of the spur gear segment in the double gear segment.

8. A metal powder forming apparatus for gear production according to claim 2, characterized in that, A sealing cavity (9) is slidably provided on the upper end surface of the base (6), and a feeding pump (10) is connected to the outside of the sealing cavity (9). A moving part (91) is provided at one end of the sealing cavity (9) near the upper mold (1).

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