A bimetallic powder metallurgy wire gear manufacturing die

Abstract

The present invention relates to the technical field of gear processing, and more specifically, to a bimetallic powder metallurgy wire gear manufacturing mold, comprising a wire gear inner mold, a wire gear outer mold, a mold base, and a powder adding bin, wherein the wire gear inner mold is connected to the mold base, a cavity is provided in the wire gear inner mold, a pressing portion that cooperates with the cavity is provided on the wire gear outer mold, the cavity comprises a first cavity and a second cavity, the first cavity is connected to the second cavity, a first powder cavity and a second powder cavity are provided in the powder adding bin, and a partition is provided between the first powder cavity and the second powder cavity; when the powder adding bin rotates and exits relative to the wire gear inner mold, the powder in the first powder cavity falls into the first cavity, and the powder in the second powder cavity falls into the second cavity. The present invention can produce bimetallic wire gears with a high-strength alloy material on the outer periphery and ordinary metal material on the inner periphery, taking into account both gear strength and production costs.

Description

Technical Field

[0001] The present invention relates to the technical field of gear processing, and more particularly to a bimetallic powder metallurgy wire gear manufacturing die. Background Art

[0002] Linear gears are gears based on the conjugate theory of spatial curves. They operate as point-contact transmissions, typically using cylindrical and conical helices as their contact lines. Linear gears have a small number of teeth and are free of undercutting. Given comparable tooth size and pitch, linear gears with fewer teeth are smaller than conventional gears. This saves material, reduces weight, and reduces the volume of the gear train, facilitating lightweight design. Powder metallurgy is an industrial technology that uses metal powders, or mixtures of metal and non-metallic powders, as raw materials to produce metal materials, composite materials, and various other products through compaction and sintering. Powder metallurgy offers significant advantages, including significant energy and material savings, superior performance, high product precision, and excellent stability, making it ideal for mass production. Manufacturing linear gears using powder metallurgy improves production efficiency and reduces costs, while also achieving unique chemical compositions, mechanical, and physical properties not achievable through traditional casting methods.

[0003] In the prior art, Chinese patent CN115090803B discloses an automatic gear rolling machine for linear gears, comprising a base, a base plate, two slides, and a workpiece clamping mechanism. The two slides are arranged parallel to each other on the base plate and can slide relative to each other. Drive racks are arranged on the two slides relative to each other. The base plate is arranged above the two slides and is provided with a drive mechanism. The output end of the drive mechanism is connected to a drive gear, which meshes with the drive racks of the two slides. Rack dies for gear rolling are arranged relative to each other on the inner sides of the two slides. The rack dies are connected to the inner sides of the slides via a rack die spacing adjustment mechanism. A rack die phase adjustment mechanism is also provided on the inner sides of the slides. The workpiece clamping mechanism is arranged between the two slides. Slide spacing adjustment mechanisms are provided on the outer sides of both slides, enabling automated processing of linear gears. However, this gear rolling machine can only produce linear gears with a single chemical composition during the linear gear processing process. Using a high-strength alloy material would be too costly, while using a lower-cost ordinary steel would be insufficiently strong, failing to balance gear strength and production and processing costs. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology that cannot take into account both gear strength and production and processing costs, and to provide a bimetallic powder metallurgy wire gear manufacturing mold that can produce a wire gear composed of high-strength alloy materials and ordinary metal materials, thereby ensuring higher gear strength while reducing production costs.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A bimetallic powder metallurgy wire gear manufacturing mold is provided, comprising a wire gear inner mold, a wire gear outer mold, a mold base and a powder adding bin, wherein the wire gear inner mold is connected to the mold base, a cavity is provided in the wire gear inner mold, and a pressing portion that cooperates with the cavity is provided on the wire gear outer mold, the cavity comprises a first cavity and a second cavity, the first cavity is communicated with the second cavity, a first powder cavity and a second powder cavity are provided in the powder adding bin, and a partition is provided between the first powder cavity and the second powder cavity; when the powder adding bin rotates and exits relative to the wire gear inner mold, the powder in the first powder cavity falls into the first cavity, and the powder in the second powder cavity falls into the second cavity.

[0007] The bimetallic powder metallurgy wire gear manufacturing mold of the present invention includes a powder adding stage and a pressing stage during the working process. In the powder adding stage, the position of the wire gear inner mold is first fixed by the mold base, and the powder adding bin is rotated into the cavity of the wire gear inner mold. The first cavity is used to form the core structure of the wire gear, and the second cavity located around the cavity is used to form the wire gear wire tooth structure. The partition is used to separate the first powder cavity from the second powder cavity. Ordinary metal powder material is added to the first powder cavity, and high-strength alloy powder material is added to the second powder cavity. Then, the powder adding bin is slowly rotated and pulled out from the wire gear inner mold. The ordinary metal powder material falls into the first cavity, and the high-strength alloy powder material falls into the second cavity, ensuring that the two metal powders can fall into the specified position in the cavity. In the pressing stage, pressure is applied to the wire gear outer mold by a press, so that the pressing part on the wire gear outer mold slowly enters the cavity. The pressing part cooperates with the cavity to press the metal powder into a wire gear pressed embryo. The bimetallic powder metallurgy wire gear manufacturing mold of the present invention enables high-strength metal powder to fall on the meshing position of the wire gear, saving the cost of manufacturing the wire gear, effectively improving the wear resistance and service life of the gear pair, providing higher gear strength while reducing production costs.

[0008] Furthermore, the first and second powder chambers are concentric circles, ensuring that ordinary metal powder falls on the core of the gear, while the meshing areas around the gear are filled with high-strength alloy powder, effectively improving material utilization.

[0009] Furthermore, the powder feeding hopper is a first powder feeding hopper, which includes a connecting portion whose outer contour is the same as the inner contour of the mold cavity, and the connecting portion is spiral-shaped. The first powder chamber is connected to the first mold cavity, and the second powder chamber is connected to the second mold cavity. The outer contour of the connecting portion is the same as the inner contour of the mold cavity in the linear gear inner mold, ensuring that the connecting portion can be smoothly rotated out of the linear gear inner mold. During the powder feeding process, the staff pours ordinary metal powder into the first powder chamber and high-strength alloy powder into the second powder chamber. The powder can slide inside the connecting portion and ultimately land accurately in the first and second mold cavities. The powder stack shape is similar to that of a linear gear, which facilitates the subsequent pressing of a linear gear embryo that meets the requirements.

[0010] Furthermore, the second powder chamber is annular, with a width smaller than the radius of the first powder chamber. The first powder chamber is located at the center of the first addition chamber, and the second powder chamber is annularly arranged around the first powder chamber. The first powder chamber has a larger diameter and is used to form the core structure of a linear gear from ordinary metal materials. The second powder chamber has a smaller width and is filled with high-strength alloy powder to form the linear gear's tooth structure, thereby reducing the amount of high-strength alloy powder used and lowering the production cost of the linear gear.

[0011] Furthermore, the connecting portion is provided with multiple groups of first through-holes, which communicate with the second powder chamber and are centrally symmetrical about the center of the second powder chamber. The first through-holes extend through the connecting portion, and these multiple groups of centrally symmetrical first through-holes uniformly transfer the high-strength alloy powder in the second powder chamber to the second mold cavity, where it lands on the meshing area outside the linear gear.

[0012] Furthermore, the first through hole is spiral-shaped. High-strength alloy powder is added to the spiral-shaped first through hole, and a strip-shaped high-strength alloy powder curve can be formed during the powder adding process, maintaining high strength and wear resistance at the linear gear meshing position.

[0013] Furthermore, the powder adding bin is a second powder adding bin, and a first connecting tube and a second connecting tube are provided in the second powder adding bin, and the second powder cavity is provided in the first connecting tube, one end of the second connecting tube is connected to the first connecting tube, and the other end is provided on the side of the second powder adding bin; a plurality of second through holes connected to the first cavity are provided at the bottom of the first powder cavity, and the second powder cavity is connected to the second cavity through the first connecting tube and the second connecting tube. During the powder adding stage, ordinary metal powder material is added to the first powder cavity, and the ordinary metal powder material falls into the first cavity through the second through hole; high-strength alloy powder is added to the second powder cavity, and the high-strength alloy powder falls into the second cavity through the first connecting tube and the second connecting tube. The two different metal powders are transported to different positions of the mold inside the linear gear through the first connecting tube, the second connecting tube and the second through hole to facilitate subsequent pressing and molding.

[0014] Furthermore, the first powder cavity is annular, with a width greater than the radius of the second powder cavity. The second powder cavity, located at the center of the second powder feeding bin and having a smaller radius, is suitable for introducing high-strength alloy powder of smaller diameter. The first powder cavity is annular and has a larger width, occupying most of the area of ​​the linear gear core. Ordinary metal powder is added to fill the first powder cavity, and ultimately, through pressing, a bimetallic linear gear is formed with an ordinary metal powder core and a high-strength alloy powder outer surface.

[0015] Furthermore, the second powder feeding hopper has an outer edge with an arcuate groove formed therein, which communicates with the second connecting pipe. The second connecting pipe is connected to the arcuate groove in the outer edge, allowing the high-strength alloy powder in the second powder chamber to fall into the mold cavity through the arcuate groove. This ensures that the entire contact surface of the linear gear teeth is covered with high-strength alloy powder material, improving the gear's strength and wear resistance, and extending its service life.

[0016] Furthermore, the mold base is provided with a pressing groove at one end and a material return groove at the other end. Both the pressing groove and the material return groove can cooperate with the wire gear inner mold. Both the pressing groove and the material return groove are provided with locking members for securing the wire gear inner mold. During the powder adding and pressing stages, the wire gear inner mold cooperates with the pressing groove and is secured by the locking member. After pressing is complete, the locking member and the wire gear inner mold are removed and placed into the material return groove. The bimetallic wire gear pressed blank can then be removed from the wire gear inner mold using a press, completing the material return.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Able to produce linear gears with high-strength alloy material on the outside and ordinary metal material on the inside, taking into account both gear strength and production cost;

[0019] 2. Provide a variety of powder silos with different specifications for metal materials with different powder diameters;

[0020] 3. The special base structure can be used for both metal powder pressing and gear blank removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of the mold for manufacturing bimetallic powder metallurgy wire gears;

[0022] Figure 2 for Figure 1 Cross-sectional view at the AA position;

[0023] Figure 3 Schematic diagram of the structure of the first powder adding bin;

[0024] Figure 4 This is a structural diagram of the first powder adding bin from another angle;

[0025] Figure 5 This is a schematic diagram of the structure of the second powder adding bin from a top view;

[0026] Figure 6 This is a schematic diagram of the structure of the second powder adding bin from an upward perspective;

[0027] Figure 7 Cross-sectional view of the second powder adding bin

[0028] Figure 8 Schematic diagram of the bimetallic wire gear structure.

[0029] In the accompanying drawings: 100, inner mold of the wire gear; 110, cavity; 200, outer mold of the wire gear; 210, pressing part; 220, groove; 230, thrust bearing; 300, mold base; 310, pressing groove; 320, material return groove; 330, locking piece; 410, first powder chamber; 420, second powder chamber; 500, first powder adding bin; 510, connecting part; 511, first through hole; 600, second powder adding bin; 610, first connecting pipe; 620, second connecting pipe; 630, second through hole; 640, outer edge; 650, arc groove; 700, bimetallic wire gear; 710, contact part. DETAILED DESCRIPTION

[0030] The present invention is further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic, not actual, representations. They should not be construed as limiting this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted from the drawings.

[0031] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] Example 1

[0033] This embodiment is the first embodiment of a bimetallic powder metallurgy wire gear manufacturing mold, including a wire gear inner mold 100, a wire gear outer mold 200, a mold base 300 and a powder adding bin. The wire gear inner mold 100 is connected to the mold base 300. A cavity 110 is provided in the wire gear inner mold 100. A pressing portion 210 that cooperates with the cavity 110 is provided on the wire gear outer mold 200. The cavity 110 includes a first cavity and a second cavity. The first cavity is connected to the second cavity. A first powder cavity 410 and a second powder cavity 420 are provided in the powder adding bin, and a partition is provided between the first powder cavity 410 and the second powder cavity 420. When the powder adding bin rotates and exits relative to the wire gear inner mold 100, the powder in the first powder cavity 410 falls into the first cavity, and the powder in the second powder cavity 420 falls into the second cavity. Figure 1 、 Figure 2As shown, the bimetallic powder metallurgy wire gear manufacturing mold in this embodiment includes a powder adding stage and a pressing stage during the working process. In the powder adding stage, the position of the wire gear inner mold 100 is first fixed by the mold base 300, and the powder adding bin is rotated into the cavity 110 of the wire gear inner mold 100. Then, ordinary metal powder material is added to the first powder cavity 410, and high-strength alloy powder material is added to the second powder cavity 420. Then, the powder adding bin is slowly rotated and pulled out from the wire gear inner mold 100. At this time, the powder in the first powder cavity 410 falls into the first cavity, and the powder in the second powder cavity 420 falls into the second cavity. The partition ensures that the two metal powders can fall into the specified position in the cavity 110. In the pressing stage, pressure is applied to the wire gear outer mold 200 by a press, so that the pressing part 210 on the wire gear outer mold 200 slowly enters the cavity 110, and the pressing part 210 cooperates with the cavity 110 to press the metal powder into a wire gear pressed embryo. The first cavity can be set in the center of the cavity to form the gear core, and the second cavity can be set around the cavity to form the wire gear structure. The gear core is finally pressed into ordinary metal powder material, and the outer peripheral surface of the entire wire gear structure is made of high-strength alloy powder to improve the overall gear strength and service life. However, the amount of high-strength metal powder used is large and the cost is high. Figure 8 As shown, the second cavity can also be configured as a spatial meshing curve. Specifically, only the meshing curve of the wire gear structure is designated as the second cavity, while the remaining portion is the first cavity. The resulting wire gear is filled with high-strength alloy powder only at the meshing location, improving material utilization and reducing production costs. In actual production, the shape, size, and relative position of the first and second cavities can be adjusted according to actual needs, allowing for the production of a variety of wire gears with varying powder distributions.

[0034] The first powder chamber 410 and the second powder chamber 420 are concentric circles. Figure 3 As shown, the first powder cavity 410 and the second powder cavity 420 are concentric circles. Ordinary metal powder is introduced into the first powder cavity 410, and high-strength metal powder is introduced into the second powder cavity 420. Finally, a bimetallic wire gear 700 is pressed into a core of ordinary metal powder and surrounded by high-strength metal powder.

[0035] The powder feeding hopper is the first powder feeding hopper 500 and includes a connecting portion 510. The outer contour of the connecting portion 510 is identical to the inner contour of the mold cavity 110 and is spirally shaped. The first powder cavity 410 communicates with the first mold cavity, and the second powder cavity 420 communicates with the second mold cavity. The outer contour of the connecting portion 510 on the first powder feeding hopper 500 is identical to the inner contour of the mold cavity 110. Both are spiral structures that can be gradually rotated and pulled out of the wire gear inner mold 100. This ensures that the metal powder in the first and second powder cavities 410 and 420 fall into the first and second mold cavities, respectively, during the powder feeding process, facilitating the pressing process to form the bimetallic wire gear 700.

[0036] The second powder chamber 420 is annular, with a width smaller than the radius of the first powder chamber 410. The first powder chamber 410 is located in the center of the first powder hopper 500, and the second powder chamber 420 surrounds the first powder chamber 410. The first powder chamber 410 has a larger diameter and is used to form ordinary metal materials into the core structure of a linear gear. The second powder chamber 420 has a width smaller than the radius of the first powder chamber 410. The smaller second powder chamber 420 is filled with high-strength alloy powder, reducing the amount of high-strength alloy powder used and lowering the production cost of the linear gear.

[0037] The connecting portion 510 is provided with a plurality of first through holes 511, the first through holes 511 being connected to the second powder chamber 420, and the first through holes 511 are centrally symmetrical about the center of the second powder chamber 420. Figure 3 、 Figure 4 As shown, two groups of first through holes 511 are provided on each gear tooth of the linear gear, corresponding to multiple meshing positions during the operation of the linear gear. The high-strength metal powder in the second powder chamber 420 passes through the first through holes 511 and falls into the mold cavity 110.

[0038] The first through hole 511 is spiral. Figure 8 As shown, high-strength alloy powder is added to the spiral first through hole 511, and finally a contact portion 710 is formed on the linear gear. The contact portion 710 is a strip-shaped high-strength alloy powder space curve, which maintains high strength and wear resistance at the linear gear meshing position.

[0039] The working principle of the bimetallic powder metallurgy wire gear manufacturing mold in this embodiment is as follows: in the powder adding stage, the position of the wire gear inner mold 100 is fixed by the mold base 300, and the first powder adding bin 500 is rotated into the cavity 110 of the wire gear inner mold 100. Then, ordinary metal powder material is added to the first powder cavity 410, and high-strength alloy powder material is added to the second powder cavity 420. The powder adding bin is then slowly rotated and pulled out from the wire gear inner mold 100, and pressure is applied to the wire gear outer mold 200 by a press, so that the pressing part 210 on the wire gear outer mold 200 slowly enters the cavity 110, and the pressing part 210 cooperates with the cavity 110 to press the metal powder into a wire gear pressed embryo.

[0040] Example 2

[0041] This embodiment is the second embodiment of the bimetallic powder metallurgy wire gear manufacturing mold. This embodiment is similar to the first embodiment, except that the powder adding bin is the second powder adding bin 600, and the second powder adding bin 600 is provided with a first connecting tube 610 and a second connecting tube 620. The second powder cavity 420 is provided in the first connecting tube 610, and one end of the second connecting tube 620 is connected to the first connecting tube 610, and the other end is provided on the side of the second powder adding bin 600; the bottom of the first powder cavity 410 is provided with a plurality of second through holes 630 connected to the first cavity, and the second powder cavity 420 is connected to the second cavity. Figure 5 、 Figure 6 As shown, in the powder adding stage, ordinary metal powder material is added to the first powder cavity 410, and the ordinary metal powder material falls into the first cavity through the second through hole 630, and high-strength alloy powder is added to the second powder cavity 420, and the high-strength alloy powder falls into the second cavity through the first connecting tube 610 and the second connecting tube 620. The two different metal powders are transported to different positions of the inner mold 100 of the linear gear through the first connecting tube 610, the second connecting tube 620 and the second through hole 630 to facilitate subsequent pressing and molding.

[0042] The first powder chamber 410 is annular, and the width of the first powder chamber 410 is greater than the radius of the second powder chamber 420. Figure 5 As shown, the radius of the second powder cavity 420 is smaller, which is suitable for introducing high-strength alloy powder with a smaller diameter. The diameter of the first powder cavity 410 is larger, and the ring width of the first powder cavity 410 is smaller than the radius of the second powder cavity 420, occupying most of the area of ​​the core of the wire gear. Ordinary metal powder is added to fill the first powder cavity 410, and finally, after pressing, a bimetallic wire gear 700 is formed with a core of ordinary metal powder and an outer peripheral surface of high-strength alloy powder.

[0043] The side of the second powder adding bin 600 is provided with an outer edge portion 640, and an arc groove 650 is provided in the outer edge portion 640. The arc groove 650 is connected to the second connecting pipe 620. Figure 6 、 Figure 7 As shown, the second connecting tube 620 is connected to the arc groove 650 in the outer edge portion, and the high-strength alloy powder in the second powder chamber 420 falls into the mold cavity 110 through the arc groove 650, ensuring that the entire linear gear tooth contact surface is made of high-strength alloy powder material, thereby improving the gear strength and wear resistance and extending the service life.

[0044] The working principle of the bimetallic powder metallurgy wire gear manufacturing mold in this embodiment is as follows: when adding powder using the second powder adding bin 600, ordinary metal powder material is added to the first powder cavity 410, and the ordinary metal powder material falls into the first cavity through the second through hole 630 and is formed into the core structure of the wire gear; high-strength alloy powder is added to the second powder cavity 420, and the high-strength alloy powder falls into the outer edge through the first connecting tube 610 and the second connecting tube 620, and finally reaches the second cavity through the arc groove 650.

[0045] Example 3

[0046] This embodiment is the third embodiment of a bimetallic powder metallurgy wire gear manufacturing mold. This embodiment is similar to the first embodiment, except that a pressing groove 310 is provided at one end of the mold base 300 and a material withdrawal groove 320 is provided at the other end. Both the pressing groove 310 and the material withdrawal groove 320 can cooperate with the wire gear inner mold 100. Both the pressing groove 310 and the material withdrawal groove 320 are provided with locking members 330 for fixing the wire gear inner mold 100. The working process of the bimetallic powder metallurgy wire gear manufacturing mold in this embodiment includes a powder adding stage, a pressing stage, and a material withdrawal stage. During the powder adding stage and the pressing stage, the wire gear inner mold 100 is set in the pressing groove 310 of the mold base 300 and is fixed by a locking member 330. The locking member 330 can be threadedly connected to the wire gear inner mold 100 using a locking screw. During the material removal stage, the locking piece 330 is removed, and the wire gear inner mold 100 is taken out of the mold base 300. After the mold base 300 is turned upside down, the material removal groove 320 is aligned with the wire gear inner mold 100. The wire gear inner mold 100 is installed into the material removal groove 320 and fixed with the locking piece 330. The pressure mechanism is used to remove the bimetallic wire gear 700 pressed embryo to complete the material removal.

[0047] In this embodiment, the wire gear outer mold 200 has a groove 220 at its top, which houses a thrust bearing 230. The thrust bearing 230 allows the mold 200 to rotate while moving downward during the pressing process, completing the pressing of the bimetallic wire gear 700.

[0048] The working principle of the bimetallic powder metallurgy wire gear manufacturing mold in this embodiment is as follows: during the powder adding stage and the pressing stage, the wire gear inner mold 100 is placed in the pressing groove 310 and fixed to the mold base 300 by the locking piece 330. During the material withdrawal stage, the wire gear inner mold 100 is placed in the material withdrawal groove 320 and is fixed by the locking piece 330 before the material is withdrawn; a thrust bearing 230 is provided on the wire gear outer mold 200, which can synchronously complete rotation during the pressing process.

[0049] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A bimetallic powder metallurgy wire gear manufacturing mold, characterized in that: The invention comprises a linear gear inner mold (100), a linear gear outer mold (200), a mold base (300) and a powder adding bin, wherein the linear gear inner mold (100) is connected to the mold base (300), a cavity (110) is provided in the linear gear inner mold (100), a pressing portion (210) matched with the cavity (110) is provided on the linear gear outer mold (200), the cavity (110) comprises a first cavity and a second cavity, the first cavity is communicated with the second cavity, a first powder cavity (410) and a second powder cavity (420) are provided in the powder adding bin, and a partition is provided between the first powder cavity (410) and the second powder cavity (420); when the powder adding bin rotates and exits relative to the linear gear inner mold (100), the powder in the first powder cavity (410) falls into the first cavity, and the powder in the second powder cavity (420) falls into the second cavity.

2. The bimetallic powder metallurgy wire gear manufacturing mold according to claim 1, characterized in that: The first powder chamber (410) and the second powder chamber (420) are concentric circle structures.

3. The bimetallic powder metallurgy wire gear manufacturing mold according to claim 2, characterized in that: The powder adding bin is a first powder adding bin (500), and the first powder adding bin (500) includes a connecting portion (510), the outer contour of the connecting portion (510) is the same as the inner contour of the mold cavity (110), and the connecting portion (510) is spiral-shaped; the first powder cavity (410) is connected to the first mold cavity, and the second powder cavity (420) is connected to the second mold cavity.

4. The bimetallic powder metallurgy wire gear manufacturing mold according to claim 3, characterized in that: The second powder chamber (420) is annular, and the width of the second powder chamber (420) is smaller than the radius of the first powder chamber (410).

5. The bimetallic powder metallurgy wire gear manufacturing mold according to claim 3, characterized in that: A plurality of first through holes (511) are provided in the connecting portion (510), the first through holes (511) are communicated with the second powder chamber (420), and the first through holes (511) are centrally symmetrical about the center of the second powder chamber (420).

6. The bimetallic powder metallurgy wire gear manufacturing mold according to claim 5, characterized in that: The first through hole (511) is spiral-shaped.

7. The bimetallic powder metallurgy wire gear manufacturing mold according to claim 2, characterized in that: The powder adding bin is a second powder adding bin (600), a first connecting tube (610) and a second connecting tube (620) are provided in the second powder adding bin (600), the second powder cavity (420) is provided in the first connecting tube (610), one end of the second connecting tube (620) is communicated with the first connecting tube (610), and the other end is provided on the side of the second powder adding bin (600); a plurality of second through holes (630) communicating with the first cavity are provided at the bottom of the first powder cavity (410), and the second powder cavity (420) is communicated with the second cavity through the first connecting tube (610) and the second connecting tube (620).

8. The bimetallic powder metallurgy wire gear manufacturing mold according to claim 7, characterized in that: The first powder chamber (410) is annular, and the width of the first powder chamber (410) is greater than the radius of the second powder chamber (420).

9. The bimetallic powder metallurgy wire gear manufacturing mold according to claim 7, characterized in that: An outer edge portion (640) is provided on the side of the second powder adding bin (600), an arc-shaped groove (650) is provided in the outer edge portion (640), and the arc-shaped groove (650) is communicated with the second connecting pipe (620).

10. The bimetallic powder metallurgy wire gear manufacturing die according to any one of claims 1 to 9, characterized in that: The mold base (300) is provided with a pressing groove (310) at one end and a material return groove (320) at the other end. Both the pressing groove (310) and the material return groove (320) can cooperate with the linear gear inner mold (100). The pressing groove (310) and the material return groove (320) are provided with locking parts (330) for fixing the linear gear inner mold (100).

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