Bimetal powder metallurgy linear gear manufacturing die

Abstract

The invention relates to the technical field of gear machining, in particular to a bimetal powder metallurgy linear gear manufacturing die which comprises a linear gear inner die, a linear gear outer die, a die base and a powder adding bin. The linear gear outer mold is provided with a pressing part matched with the cavity, 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 formed in the powder adding bin, and a separation part is arranged between the first powder cavity and the second powder cavity; and when the powder adding bin rotates and retreats relative to the linear 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 double-metal-wire gear with the periphery made of a high-strength alloy material and the interior made of a common metal material can be produced, and the gear strength and the production cost are both considered.

Description

Technical Field

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

[0002] Linear gear is a gear based on the conjugate theory of space curves. It belongs to point contact transmission in the transmission process. Usually cylindrical helical lines and conical helical lines are used as its contact lines. Linear gears have fewer teeth and no root cutting. When the gear teeth are of the same size and pitch, linear gears with fewer teeth are smaller than ordinary gears. They can save gear materials, reduce gear weight, and reduce the volume of gear transmission systems, which is conducive to lightweight design. Powder metallurgy is an industrial technology that uses metal powder or a mixture of metal powder and non-metallic powder as raw materials, and through pressing, forming and sintering, to produce metal materials, composite materials and various types of products. Powder metallurgy technology has a series of advantages such as significant energy saving, material saving, excellent performance, high product precision and good stability, and is very suitable for mass production. The use of powder metallurgy to manufacture linear gears can not only improve production efficiency and reduce production costs, but also obtain unique chemical composition and mechanical and physical properties that cannot be obtained by traditional casting methods.

[0003] In the prior art, for example, Chinese patent CN115090803B discloses an automatic gear rolling machine for linear gears, which includes a base, a substrate, two slides and a workpiece clamping mechanism. The two slides are arranged in parallel on the base, the two slides can slide relative to each other, transmission racks are arranged relative to each other on the two slides, the substrate is arranged above the two slides, a driving mechanism is arranged on the substrate, the output end of the driving mechanism is connected to a transmission gear, and the transmission gear meshes with the transmission racks of the two slides for transmission; the inner sides of the two slides are relatively arranged with rack dies for rolling gears, the rack dies are connected to the inner sides of the slides through a rack die spacing adjustment mechanism, and a rack die phase adjustment mechanism is also arranged on the inner sides of the slides; the workpiece clamping mechanism is arranged between the two slides; the outer sides of the two slides are both provided with a slide spacing adjustment mechanism, which can realize the automatic processing of linear gears. However, the gear rolling machine can only produce linear gears with a single chemical composition during the processing of linear gears. If a high-strength alloy material is used, the cost is too high, and if a low-priced ordinary steel is used, the strength is insufficient, and the gear strength and production and processing costs cannot be taken into account. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art that it 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 manufacture 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, the wire gear inner mold is connected to the mold base, a cavity is provided in the wire gear inner mold, a pressing portion cooperating 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, 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, and 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, and 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 powder chamber and the second powder chamber are concentric circles, which ensure that ordinary metal powder falls on the core of the linear gear, while the meshing area around the gear is filled with high-strength alloy powder, effectively improving material utilization.

[0009] Furthermore, the powder adding bin is the first powder adding bin, and the first powder adding bin includes a connecting part, the outer contour of the connecting part is the same as the inner contour of the cavity, and the connecting part is spiral; the first powder cavity is connected to the first cavity, and the second powder cavity is connected to the second cavity. The outer contour of the connecting part is the same as the inner contour of the cavity in the inner mold of the linear gear, ensuring that the connecting part can be smoothly screwed out of the inner mold of the linear gear. During the powder adding process, the staff pours ordinary metal powder into the first powder cavity and high-strength alloy powder into the second powder cavity. The powder can slide inside the connecting part and finally accurately fall into the first cavity and the second cavity. The powder stacking shape is similar to the linear gear, which is convenient for the subsequent pressing of the linear gear embryo that meets the use requirements.

[0010] Furthermore, the second powder cavity is in the shape of a ring, and the ring width of the second powder cavity is smaller than the radius of the first powder cavity. The first powder cavity is arranged at the center of the first addition bin, and the second powder cavity is arranged in the shape of a ring around the first powder cavity. The first powder cavity has a larger diameter and is used for forming the core structure of the wire gear with ordinary metal materials. The second powder cavity has a smaller ring width. High-strength alloy powder is filled in the second powder cavity with a smaller volume to form the wire gear structure in the wire gear, thereby reducing the amount of high-strength alloy powder used and reducing the production cost of the wire gear.

[0011] Furthermore, the connecting portion is provided with a plurality of first through holes, the first through holes are connected to the second powder cavity, and the first through holes are centrally symmetrical about the center of the second powder cavity. The first through holes penetrate the connecting portion, and the centrally symmetrical plurality of first through holes uniformly transfer the high-strength alloy powder in the second powder cavity to the second cavity, and land on the meshing area outside the linear gear.

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

[0013] Furthermore, the powder adding bin is a second powder adding bin, a first connecting tube and a second connecting tube are provided in the second powder adding bin, 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. In 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, and the two different metal powders are transported to different positions of the mold in the linear gear through the first connecting tube, the second connecting tube and the second through hole, so as to facilitate subsequent pressing and molding.

[0014] Furthermore, the first powder cavity is in the shape of a ring, and the ring width of the first powder cavity is greater than the radius of the second powder cavity. The second powder cavity is located at the center of the second powder adding bin and has a smaller radius, which is suitable for introducing high-strength alloy powder with a smaller diameter. The first powder cavity is in the shape of a ring and has a larger ring width, occupying most of the area of ​​the core of the wire gear. Ordinary metal powder is added to fill the first powder cavity, and finally a bimetallic wire gear with a core of ordinary metal powder and a peripheral surface of high-strength alloy powder is formed through pressing.

[0015] Furthermore, the side of the second powder adding bin is provided with an outer edge portion, and the outer edge portion is provided with an arc groove, and the arc groove is connected to the second connecting pipe. The second connecting pipe is connected to the arc groove in the outer edge portion, and the high-strength alloy powder in the second powder cavity falls into the mold cavity through the arc groove, ensuring that the entire linear gear tooth contact surface is made of high-strength alloy powder material, thereby improving the strength and wear resistance of the gear and extending the service life.

[0016] Furthermore, a pressing groove is provided at one end of the mold base, and a material withdrawal groove is provided at the other end. Both the pressing groove and the material withdrawal groove can cooperate with the wire gear inner mold, and both the pressing groove and the material withdrawal groove are provided with locking parts for fixing the wire gear inner mold. During the powder adding stage and the pressing stage, the wire gear inner mold cooperates with the pressing groove and is fixed by the locking parts. After the pressing is completed, the locking parts and the wire gear inner mold are taken out, and the wire gear inner mold is placed in the material withdrawal groove. The bimetal wire gear pressed blank can be withdrawn from the wire gear inner mold by the press to complete the material withdrawal.

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

[0018] 1. It is possible to produce linear gears with high-strength alloy materials on the outer circumference and ordinary metal materials on the inner part, taking into account both gear strength and production cost;

[0019] 2. Provide powder adding bins of various 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 Sectional view at the AA position;

[0023] Figure 3 It is a structural schematic diagram of the first powder adding bin;

[0024] Figure 4 This is a structural schematic 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 angle;

[0027] Figure 7 A 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 wire gear; 110, cavity; 200, outer mold of wire gear; 210, pressing part; 220, groove; 230, thrust bearing; 300, mold base; 310, pressing groove; 320, return groove; 330, locking piece; 410, first powder cavity; 420, second powder cavity; 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 in conjunction with specific implementation methods. The accompanying drawings are only used for exemplary descriptions and are only schematic diagrams, not actual drawings, and cannot be understood as limiting this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[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, rather than indicating or implying 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 limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] Embodiment 1

[0033] The present embodiment is the first embodiment of a bimetallic powder metallurgy wire gear manufacturing mold, comprising 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 cooperating with the cavity 110 is provided on the wire gear outer mold 200. The cavity 110 comprises 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. 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, and 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 a wire gear made of ordinary metal powder material, and the outer peripheral surface of the entire wire gear structure is high-strength alloy powder, which improves 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 set to the shape of a spatial meshing curve, that is, only the corresponding position of the meshing curve of the wire tooth structure in the cavity is set to the second cavity, and the rest are the first cavity, and finally formed into a wire gear with high-strength alloy powder only at the meshing position, thereby improving material utilization and reducing production costs. In the actual production process, the shape, size and relative position of the first cavity and the second cavity can be adjusted according to actual needs to form a variety of wire gears with different powder distribution conditions.

[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, and finally a bimetallic wire gear 700 pressed embryo is formed with ordinary metal powder as the core and high-strength metal powder as the surrounding.

[0035] The powder adding bin is the 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 cavity 110, and the connecting portion 510 is spiral; the first powder cavity 410 is connected to the first cavity, and the second powder cavity 420 is connected to the second cavity. The outer contour of the connecting portion 510 on the first powder adding bin 500 is the same as the inner contour of the cavity 110, and both are spiral structures that can be gradually rotated out of the wire gear inner mold 100, ensuring that the metal powders in the first powder cavity 410 and the second powder cavity 420 can fall into the first cavity and the second cavity respectively during the powder adding process, so as to facilitate the pressing into the bimetallic wire gear 700.

[0036] The second powder cavity 420 is in the shape of a ring, and the ring width of the second powder cavity 420 is smaller than the radius of the first powder cavity 410. The first powder cavity 410 is arranged at the center of the first powder adding bin 500, and the second powder cavity 420 is arranged around the first powder cavity 410. The first powder cavity 410 has a larger diameter and is used for forming ordinary metal materials into the core structure of the linear gear. The ring width of the second powder cavity 420 is smaller than the radius of the first powder cavity 410. The high-strength alloy powder is filled in the second powder cavity 420 with a smaller volume, which reduces the amount of high-strength alloy powder and reduces 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 are 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 a plurality of meshing positions during the operation of the linear gear, and 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-shaped. Figure 8 As shown, high-strength alloy powder is added into 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, and 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, and then the powder adding bin is 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] Embodiment 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 a 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, and the second powder cavity 420 is arranged 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 arranged 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, and 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 relatively small, and it is suitable for introducing high-strength alloy powder with a smaller diameter. The diameter of the first powder cavity 410 is relatively large, 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, whose core is ordinary metal powder and the outer peripheral surface is high-strength alloy powder.

[0043] The second powder adding bin 600 is provided with an outer edge portion 640 on its side, and an arc groove 650 is provided in the outer edge portion 640, and 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 to be formed into a wire gear core structure; 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] Embodiment 3

[0046] This embodiment is the third embodiment of the 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, and a locking member 330 for fixing the wire gear inner mold 100 is provided in the pressing groove 310 and the material withdrawal groove 320. 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, wherein in 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 fixed by the locking member 330, and the locking member 330 can be threadedly connected to the wire gear inner mold 100 by a locking screw. During the material withdrawal stage, the locking piece 330 is removed, and the wire gear inner mold 100 is taken out from the mold base 300. After the mold base 300 is inverted, the material withdrawal groove 320 is aligned with the wire gear inner mold 100, and the wire gear inner mold 100 is loaded into the material withdrawal groove 320, fixed by the locking piece 330, and the bimetallic wire gear 700 embryo is withdrawn by a pressure mechanism to complete the material withdrawal.

[0047] The top of the wire gear outer mold 200 in this embodiment is provided with a groove 220, and a thrust bearing 230 is provided in the groove 220. The thrust bearing 230 is installed on the wire gear outer mold 200, and the mold can also rotate while moving downward during the pressing process to complete the pressing of the bimetal wire gear 700.

[0048] The working principle of the bimetallic powder metallurgy wire gear manufacturing mold in this embodiment is as follows: in 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; in the material withdrawal stage, the wire gear inner mold 100 is placed in the material withdrawal groove 320 and is withdrawn after being fixed by the locking piece 330; a thrust bearing 230 is set 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 clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope 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), the first powder adding bin (500) comprises a connecting portion (510), the outer contour of the connecting portion (510) is the same as the inner contour of the cavity (110), and the connecting portion (510) is spiral-shaped; the first powder cavity (410) is connected to the first cavity, and the second powder cavity (420) is connected to the second cavity.

4. The bimetallic powder metallurgy wire gear manufacturing mold according to claim 3, characterized in that: The second powder chamber (420) is in the shape of a circular ring, 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 groups of first through holes (511) are provided in the connecting portion (510), the first through holes (511) are in communication 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), and 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 arranged in the first connecting tube (610), one end of the second connecting tube (620) is connected to the first connecting tube (610), and the other end is arranged on the side of the second powder adding bin (600); a plurality of second through holes (630) connected to the first cavity are provided at the bottom of the first powder cavity (410), and the second powder cavity (420) is connected to 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 in the shape of a circular ring, and the ring 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), and 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 mold 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). Both the pressing groove (310) and the material return groove (320) are provided with locking members (330) for fixing the linear gear inner mold (100).

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