A gear manufacturing device for powder metallurgy manufacturing

Abstract

The present invention relates to the technical field of powder metallurgy equipment, and specifically relates to a gear manufacturing device for powder metallurgy manufacturing, including a workbench, a feeding mechanism, a main hydraulic rod, an equal-pressure mechanism, an upper die rod assembly, a female die, and a lower die rod assembly. The female die is fixedly installed on the workbench, and a middle layer cavity is opened on the female die. A cavity one is opened at the bottom end of the middle layer cavity, and a cavity two is opened on one side of the bottom end of the middle layer cavity. The feeding mechanism is installed at one end of the workbench. In the present invention, through the setting of the equal-pressure mechanism, the pressures when the first die rod, the second die rod, and the third die rod are pressed downward are the same. During the stamping process, the top end of the fifth die rod moves to a position flush with the inner bottom surface of the middle layer cavity, and the second die rod moves downward relative to the first die rod, thereby forming an embedding groove portion. The third die rod moves upward relative to the first die rod, thereby realizing the formation of a limiting portion in the die hole, further realizing the single stamping formation of a special-shaped gear with a three-layer structure, improving the production efficiency, and at the same time improving the uniformity of the density of the gear blank.

Description

Technical Field

[0001] The present invention relates to the technical field of powder metallurgy equipment, and specifically to a gear manufacturing equipment for powder metallurgy manufacturing. Background Art

[0002] When using powder metallurgy to manufacture gears, the manufacturing process is less. Generally, it is powder stamping and forming to form a blank, then heating and forming, and then grinding the gear surface. When manufacturing gears by powder metallurgy, the material utilization rate can reach more than 95%. The repeatability of powder metallurgy gears is very good because powder metallurgy gears are formed by pressing with a mold. Under normal use conditions, a set of molds can press tens of thousands to hundreds of thousands of gear blanks. Powder metallurgy can integrate the manufacturing of several parts. The material density of powder metallurgy gears is controllable. And for the convenience of removing the blank from the mold after forming, the roughness of the working surface of the mold is good. The existing powder metallurgy stamping devices are more suitable for gears with regular or simple structures. But when stamping gears with multi-layer structures, especially special-shaped gears, in order to make the density uniform, multi-layer stamping is mostly used, and the efficiency is not high. Summary of the Invention

[0003] The purpose of the present invention is to provide a gear manufacturing equipment for powder metallurgy manufacturing to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A gear manufacturing equipment for powder metallurgy manufacturing, comprising:

[0006] A workbench;

[0007] A female mold, fixedly installed on the workbench. A middle layer cavity is provided on the female mold. A cavity one is provided at the bottom end of the middle layer cavity, and a cavity two is provided on one side of the bottom end of the middle layer cavity;

[0008] A feeding mechanism, installed at one end of the workbench, and the feeding mechanism is used for filling powder into the female mold;

[0009] An upper die rod assembly, used for stamping downward into the female mold, and the upper die rod assembly is used for shaping one side of the gear. The upper die rod assembly includes a die rod one, a die rod two and a die rod three;

[0010] A lower die rod assembly, used for stamping upward into the female mold, and the lower die rod assembly and the upper die rod assembly cooperate to stamp the powder in the female mold;

[0011] A main hydraulic rod, installed on the workbench, and the output end of the main hydraulic rod is used to drive the lifting and moving of the upper die rod assembly;

[0012] An equal-pressure mechanism is installed between the output end of the upper die rod assembly and the main hydraulic rod. The equal-pressure mechanism is used to adjust the relative depth positions among the first die rod, the second die rod, and the third die rod.

[0013] Furthermore: The feeding mechanism includes a feeding box, the feeding box is installed on the workbench, a cylinder is installed below the feeding box on the workbench, a stacking frame is fixedly installed at the output end of the cylinder, and a release pipe is installed at the bottom end of the feeding box.

[0014] Furthermore: The lower die rod assembly includes a fourth die rod and a fifth die rod. The fifth die rod is slidably inserted into the second cavity, the fourth die rod is slidably inserted into the first cavity. A central rod is fixedly connected to the top end of the fourth die rod, and a first hydraulic rod is fixedly installed between the bottom end of the fourth die rod and the workbench. A second hydraulic rod is fixedly installed between the bottom end of the fifth die rod and the workbench.

[0015] Furthermore: A die hole is formed on the first die rod, the third die rod is slidably inserted into the die hole, the second die rod is slidably inserted into the first die rod. A die seat is fixedly installed at the top end of the first die rod, a first piston rod is fixedly installed at the top end of the die seat, a second piston rod is fixedly installed at the top end of the second die rod, a third piston rod is fixedly installed at the top end of the third die rod. The third piston rod, the second piston rod, and the first piston rod are all slidably inserted into the equal-pressure mechanism.

[0016] Furthermore: The equal-pressure mechanism includes a fixing plate and a main cylinder body. A connecting frame is fixedly connected between the top surface of the fixing plate and the output end of the main hydraulic rod. Sub-cylinder bodies are fixedly installed at the positions corresponding to the first piston rod, the second piston rod, and the third piston rod on the fixing plate. The first piston rod, the second piston rod, and the third piston rod are respectively slidably inserted into the corresponding sub-cylinder bodies. The main cylinder body is fixedly installed at the top position of the three sub-cylinder bodies.

[0017] Furthermore: The ratio of the cross-sectional areas of the first die rod, the second die rod, and the third die rod is the same as the ratio of the cross-sectional areas among the first piston rod, the second piston rod, and the third piston rod.

[0018] Furthermore: A round shaft is rotatably connected to the main cylinder body. Two groups of partitions are fixedly connected inside the main cylinder body. Partition plates are fixedly installed on the round shaft corresponding to the two groups of partitions. Through holes are formed on the partition plates. A transmission module is fixedly installed at one end of the main cylinder body. The transmission module is in transmission connection with one end of the round shaft. The transmission module is used to drive the round shaft to rotate.

[0019] Furthermore: A horizontal frame is fixedly installed on the stacking frame.

[0020] Furthermore: An air release hole is formed at the top end of the second die rod.

[0021] The present invention also provides a gear produced by a gear manufacturing device for powder metallurgy manufacturing, including a gear body. The gear body is in the shape of a sector gear as a whole. A convex tube portion is provided at the axial center position on one side of the gear body, a slot portion is formed at the axial center position on the other side of the gear body, and a limiting portion is provided at the outer edge position on the other side of the gear body.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. Through the setting of the upper die rod assembly, the female die and the lower die rod assembly, the main hydraulic rod drives the upper die rod assembly to move downward through the equal-pressure mechanism. When the upper die rod assembly moves downward, die rod five and die rod four rise simultaneously. Through the setting of the equal-pressure mechanism, the pressures when die rod one, die rod two and die rod three press downward are the same, so as to realize squeezing and shrinking the top surface of the powder at each place with the same pressure downward, improve the uniformity of each part of the blank during extrusion molding, and improve the overall strength. During the stamping process, the top of die rod five moves to a position flush with the inner bottom surface of the middle cavity, die rod two moves downward relative to die rod one, so as to form a slot portion, and die rod three moves upward relative to die rod one, so as to form a limiting portion in the die hole, further realizing the single stamping formation of the special-shaped gear with a three-layer structure, improving the production efficiency, and at the same time improving the uniformity of the density of the gear blank;

[0024] 2. Through the setting of the equal-pressure mechanism, the air cylinder drives the material stacking frame to move above the female die. Subsequently, the main hydraulic rod drives the equal-pressure mechanism and the upper die rod assembly to move downward, so that die rod one, die rod two and die rod three press downward against the horizontal frame, so that the bottoms of die rod one, die rod two and die rod three are in a flush state. Subsequently, the transmission module drives the circular shaft and the partition plate to rotate to limit the relative positions of die rod one, die rod two and die rod three. When stamping again, when die rod one drops to the height of the top of the female die, the transmission module drives the circular shaft to rotate, so that the three sub-cylinder bodies are restored to be connected, so as to realize that die rod one, die rod two and die rod three simultaneously contact and squeeze the powder, thereby reducing the density non-uniformity caused by the side movement of the powder during stamping and improving the uniformity of the density of the blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the overall structure of the manufacturing device in the present invention;

[0026] Figure 2 is a front view structure schematic diagram of the manufacturing device in the present invention;

[0027] Figure 3 is a schematic diagram of the equal-pressure mechanism structure in the present invention;

[0028] Figure 4 is a schematic diagram of the upper die rod assembly structure in the present invention;

[0029] Figure 5 is a schematic diagram of the internal structure of the main cylinder body in the present invention;

[0030] Figure 6 is a schematic diagram of the master mold structure in the present invention;

[0031] Figure 7 is a schematic diagram of the blank body located inside the master mold in the present invention;

[0032] Figure 8 is a schematic diagram of the gear structure in the present invention;

[0033] Figure 9 is a schematic diagram of the shape comparison before and after powder stamping in the present invention.

[0034] In the figure: 100, workbench; 110, first hydraulic rod; 120, second hydraulic rod; 200, feeding mechanism; 210, cylinder; 220, feeding box; 221, release pipe; 230, stacking frame; 231, horizontal frame; 300, main hydraulic rod; 400, equal-pressure mechanism; 410, connecting frame; 420, fixed plate; 430, sub-cylinder body; 440, main cylinder body; 441, partition; 450, round shaft; 451, partition plate; 452, through hole; 460, transmission module; 500, upper die rod assembly; 510, die holder; 511, first piston rod; 520, first die rod; 521, die hole; 530, second die rod; 531, second piston rod; 540, third die rod; 541, third piston rod; 600, master mold; 610, middle cavity; 620, first cavity; 630, second cavity; 700, lower die rod assembly; 710, fourth die rod; 711, center rod; 720, fifth die rod; 800, gear body; 810, convex pipe part; 820, embedded groove part; 830, limiting part. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Please refer to Figures 1 to 8, in the embodiment of the present invention, a gear manufacturing device for powder metallurgy manufacturing includes a workbench 100, a feeding mechanism 200, a main hydraulic rod 300, an equal-pressure mechanism 400, an upper die rod assembly 500, a female die 600, and a lower die rod assembly 700. The female die 600 is fixedly installed on the workbench 100. A middle cavity 610 is provided on the female die 600. A first accommodating cavity 620 is provided at the bottom end of the middle cavity 610, and a second accommodating cavity 630 is provided on one side of the bottom end of the middle cavity 610. The feeding mechanism 200 is installed at one end of the workbench 100 and is used for filling powder into the female die 600. The upper die rod assembly 500 is used for pressing downward into the female die 600 and is used for shaping one side of the gear. The upper die rod assembly 500 includes a first die rod 520, a second die rod 530, and a third die rod 540. The lower die rod assembly 700 is used for pressing upward into the female die 600. The lower die rod assembly 700 and the upper die rod assembly 500 cooperate to press the powder in the female die 600. The main hydraulic rod 300 is installed on the workbench 100, and the output end of the main hydraulic rod 300 is used to drive the upper die rod assembly 500 to move up and down. The equal-pressure mechanism 400 is installed between the upper die rod assembly 500 and the output end of the main hydraulic rod 300 and is used to adjust the relative depth positions among the first die rod 520, the second die rod 530, and the third die rod 540. The lower die rod assembly 700 includes a fourth die rod 710 and a fifth die rod 720. The fifth die rod 720 is slidably inserted into the second accommodating cavity 630, and the fourth die rod 710 is slidably inserted into the first accommodating cavity 620. A central rod 711 is fixedly connected to the top end of the fourth die rod 710, and a first hydraulic rod 110 is fixedly installed between the bottom end of the fourth die rod 710 and the workbench 100. A second hydraulic rod 120 is fixedly installed between the bottom end of the fifth die rod 720 and the workbench 100.

[0037] The present invention also provides a gear produced by a gear manufacturing device for powder metallurgy manufacturing, including a gear body 800. The gear body 800 is in the shape of a sector gear as a whole. A convex tube portion 810 is provided at the axial center position on one side of the gear body 800, a socket portion 820 is provided at the axial center position on the other side of the gear body 800, and a limiting portion 830 is provided at the outer edge position on the other side of the gear body 800.

[0038] Specifically, through the settings of the second cavity 630 and the fifth die rod 720, the volume of the powder contained in the second cavity 630 is the same as the required powder volume formed by the limiting part 830. Initially, the top end of the central rod 711 is flush with the top end of the female die 600. After the feeding mechanism 200 fills the powder into the female die 600, the powder in the female die 600 is leveled. Subsequently, the main hydraulic rod 300 drives the upper die rod assembly 500 to move downward through the equal-pressure mechanism 400. When the bottom end of the first die rod 520 moves downward to the plane position of the top end of the female die 600, the bottom ends of the first die rod 520, the second die rod 530, and the third die rod 540 are in the same plane, that is, the bottom ends of the first die rod 520, the second die rod 530, and the third die rod 540 contact the powder simultaneously. Subsequently, when the upper die rod assembly 500 moves downward, the fifth die rod 720 and the fourth die rod 710 rise simultaneously. Through the setting of the equal-pressure mechanism 400, the pressures when the first die rod 520, the second die rod 530, and the third die rod 540 press downward are the same, so as to realize squeezing and shrinking the top surface of the powder at each place with the same pressure, improve the uniformity of each part of the green body during extrusion molding, and improve the overall strength. After stamping is completed, the upper die rod assembly 500 moves upward and disengages, the fourth die rod 710 moves upward to eject the green body, and the green body is unloaded by an external manipulator. Subsequently, the fourth die rod 710 and the fifth die rod 720 are reset. During the whole stamping process, the top end of the fifth die rod 720 moves to a position flush with the inner bottom surface of the middle cavity 610, the second die rod 530 moves downward relative to the first die rod 520, thereby forming the groove part 820, and the third die rod 540 moves upward relative to the first die rod 520, thereby realizing the formation of the limiting part 830 in the die hole 521, further realizing the single stamping formation of the three-layer structured special-shaped gear, improving the production efficiency, and at the same time improving the uniformity of the density of the gear blank.

[0039] Embodiment 1

[0040] Such as Figures 1 to 5As shown, in this embodiment, the feeding mechanism 200 includes a feeding box 220. The feeding box 220 is installed on the workbench 100. A cylinder 210 is installed below the feeding box 220 on the workbench 100. A stacking frame 230 is fixedly installed at the output end of the cylinder 210. A release pipe 221 is installed at the bottom end of the feeding box 220. A die hole 521 is formed on the first die rod 520. The third die rod 540 is slidably inserted into the die hole 521. The second die rod 530 is slidably inserted into the first die rod 520. A die base 510 is fixedly installed at the top end of the first die rod 520. A first piston rod 511 is fixedly installed at the top end of the die base 510. A second piston rod 531 is fixedly installed at the top end of the second die rod 530. A third piston rod 541 is fixedly installed at the top end of the third die rod 540. The third piston rod 541, the second piston rod 531, and the first piston rod 511 are all slidably inserted between the equal-pressure mechanism 400. The equal-pressure mechanism 400 includes a fixing plate 420 and a main cylinder block 440. A connecting frame 410 is fixedly connected between the top surface of the fixing plate 420 and the output end of the main hydraulic rod 300. Sub-cylinder blocks 430 are fixedly installed at the positions corresponding to the first piston rod 511, the second piston rod 531, and the third piston rod 541 on the fixing plate 420. The first piston rod 511, the second piston rod 531, and the third piston rod 541 are respectively slidably inserted into the corresponding sub-cylinder blocks 430. The main cylinder block 440 is fixedly installed at the top position of the three sub-cylinder blocks 430. The ratio of the cross-sectional areas of the first die rod 520, the second die rod 530, and the third die rod 540 is the same as the ratio of the cross-sectional areas between the first piston rod 511, the second piston rod 531, and the third piston rod 541.

[0041] In this embodiment, the main cylinder block 440 is filled with hydraulic oil. When the first die rod 520, the second die rod 530, and the third die rod 540 press the powder downward, the three sub-cylinder blocks 430 are in a connected state. Considering the ratio of the cross-sectional areas of the first die rod 520, the second die rod 530, and the third die rod 540 and the ratio of the cross-sectional areas of the first piston rod 511, the second piston rod 531, and the third piston rod 541, when the downward pressures of the first piston rod 511, the second piston rod 531, and the third piston rod 541 are the same, the downward extrusion pressures of the first die rod 520, the second die rod 530, and the third die rod 540 on the powder are also the same. (The same downward pressures of the first die rod 520, the second die rod 530, and the third die rod 540 do not mean that the bottoms of the first die rod 520, the second die rod 530, and the third die rod 540 are always at the same level. Since the thicknesses of the powder at various places in the female die 600 are different, for example, the thickness of the powder between the fifth die rod 720 and the third die rod 540 is greater than the thickness of the powder directly below the first die rod 520. Under the condition of the same downward extrusion pressure, the compression ratios of the powder at various places in the female die 600 are the same. Combined with the upward movement of the fifth die rod 720, when the first die rod 520 moves downward, the third die rod 540 moves upward relative to the first die rod 520. Similarly, the second die rod 530 moves downward relative to the first die rod 520, forming the groove part 820). The weight differences of the first die rod 520, the second die rod 530, and the third die rod 540 are negligible compared to the downward pressure during stamping (generally several hundred Mpa).

[0042] Embodiment 2

[0043] On the basis of Embodiment 1, in order to compensate for the problem that when the equal-pressure mechanism 400 is in the initial position in Embodiment 1, due to different self-weights of the first die rod 520, the second die rod 530, and the third die rod 540, the first die rod 520, the second die rod 530, and the third die rod 540 may slide under their own weights, resulting in the bottoms of the first die rod 520, the second die rod 530, and the third die rod 540 not being in the same plane during the next stamping, and the first die rod 520, the second die rod 530, and the third die rod 540 not contacting the powder simultaneously, so as to enhance the effect of downward stamping.

[0044] As Figures 4 to 9 shown, in this embodiment, a circular shaft 450 is rotatably connected to the main cylinder block 440. Two groups of partitions 441 are fixedly connected inside the main cylinder block 440. Corresponding to the two groups of partitions 441 on the circular shaft 450, partition plates 451 are fixedly installed. Through holes 452 are opened on the partition plates 451. A transmission module 460 is fixedly installed at one end of the main cylinder block 440. The transmission module 460 is drivingly connected to one end of the circular shaft 450. The transmission module 460 is used to drive the circular shaft 450 to rotate. A horizontal frame 231 is fixedly installed on the stacking frame 230. An air vent is opened at the top end of the second die rod 530.

[0045] In specific implementation, after the stamping is completed, when the upper mold rod assembly 500 moves up and disengages, the bottom ends of mold rod 1 520, mold rod 2 530 and mold rod 3 540 are in a staggered state, and the discharge box 220 adds powder to the stacking frame 230. After the blank is unloaded, the cylinder 210 drives the stacking frame 230 to move above the mother mold 600, and then the main hydraulic rod 300 drives the isobaric mechanism 400 and the upper mold rod assembly 500 to move downward, so that mold rod 1 520, mold rod 2 530 and mold rod 3 540 are downward and in conflict with the horizontal frame 231, so that the bottom ends of mold rod 1 520, mold rod 2 530 and mold rod 3 540 are in a flush state, and then the transmission module 460 The circular shaft 450 and the partition plate 451 are driven to rotate, so that the through hole 452 is blocked by the partition 441, thereby disconnecting the three sub-cylinder bodies 430, thereby limiting the relative positions of the mold rod 1 520, the mold rod 2 530 and the mold rod 3 540. When stamping again, when the mold rod 1 520 drops to the top height of the mother mold 600, the transmission module 460 drives the circular shaft 450 to rotate, so that the three sub-cylinder bodies 430 are restored to be connected, thereby realizing that the mold rod 1 520, the mold rod 2 530 and the mold rod 3 540 contact and extrude the powder at the same time, thereby reducing the density unevenness caused by the lateral displacement of the powder during stamping and improving the uniformity of the blank density.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0047] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A gear manufacturing equipment for powder metallurgy manufacturing, characterized in that, include: Workbench(100); A mother mold (600) is fixedly mounted on a workbench (100), wherein a middle cavity (610) is formed on the mother mold (600), a first cavity (620) is formed at the bottom end of the middle cavity (610), and a second cavity (630) is formed on one side of the bottom end of the middle cavity (610); A discharge mechanism (200) is installed at one end of the workbench (100), and the discharge mechanism (200) is used to fill powder into the mother mold (600); An upper mold rod assembly (500) is used to punch downward into the female mold (600), and the upper mold rod assembly (500) is used to shape one side of the gear. The upper mold rod assembly (500) includes a mold rod 1 (520), a mold rod 2 (530), and a mold rod 3 (540); A lower die rod assembly (700) is used to punch upward into the mother die (600), wherein the lower die rod assembly (700) and the upper die rod assembly (500) cooperate to punch the powder in the mother die (600); A main hydraulic rod (300) is installed on the workbench (100), and the output end of the main hydraulic rod (300) is used to drive the upper mold rod assembly (500) to move up and down; An isobaric mechanism (400) is installed between the upper die rod assembly (500) and the output end of the main hydraulic rod (300), and the isobaric mechanism (400) is used to adjust the relative depth positions between the die rod 1 (520), the die rod 2 (530) and the die rod 3 (540); The mold rod 1 (520) is provided with a mold hole (521), the mold rod 3 (540) is slidably plugged into the mold hole (521), the mold rod 2 (530) is slidably plugged into the mold rod 1 (520), the top end of the mold rod 1 (520) is fixedly mounted with a mold base (510), the top end of the mold base (510) is fixedly mounted with a piston rod 1 (511), the top end of the mold rod 2 (530) is fixedly mounted with a piston rod 2 (531), the top end of the mold rod 3 (540) is fixedly mounted with a piston rod 3 (541), the piston rod 3 (541), the piston rod 2 (531), and the piston rod 1 (511) are all slidably plugged into the isobaric mechanism (400); The isobaric mechanism (400) includes a fixed plate (420) and a main cylinder body (440), a connecting frame (410) is fixedly connected between the top surface of the fixed plate (420) and the output end of the main hydraulic rod (300), and sub-cylinder bodies (430) are fixedly installed at positions corresponding to piston rod one (511), piston rod two (531) and piston rod three (541) on the fixed plate (420), and the piston rod one (511), piston rod two (531) and piston rod three (541) are respectively slidably plugged into the sub-cylinder bodies (430) at corresponding positions, and the main cylinder body (440) is fixedly installed at the top positions of the three sub-cylinder bodies (430); A circular shaft (450) is rotatably connected to the main cylinder body (440). Two groups of spacers (441) are fixedly connected to the interior of the main cylinder body (440). Separation plates (451) are fixedly installed on the two groups of spacers (441) corresponding to the circular shaft (450). A through hole (452) is provided on the separation plate (451). A transmission module (460) is fixedly installed on one end of the main cylinder body (440). The transmission module (460) is in transmission connection with one end of the circular shaft (450). The transmission module (460) is used to drive the circular shaft (450) to rotate.

2. The gear manufacturing equipment for powder metallurgy manufacturing according to claim 1, characterized in that: The discharge mechanism (200) comprises a discharge box (220), the discharge box (220) being mounted on a workbench (100), a cylinder (210) being mounted on the workbench (100) below the discharge box (220), a stacking frame (230) being fixedly mounted at the output end of the cylinder (210), and a release pipe (221) being mounted at the bottom end of the discharge box (220).

3. The gear manufacturing equipment for powder metallurgy manufacturing according to claim 2, characterized in that: The lower mold rod assembly (700) includes mold rod four (710) and mold rod five (720), wherein mold rod five (720) is slidably inserted into cavity two (630), and mold rod four (710) is slidably inserted into cavity one (620), and the top end of mold rod four (710) is fixedly connected to a center rod (711), and a hydraulic rod one (110) is fixedly installed between the bottom end of mold rod four (710) and the workbench (100), and a hydraulic rod two (120) is fixedly installed between the bottom end of mold rod five (720) and the workbench (100).

4. The gear manufacturing equipment for powder metallurgy manufacturing according to claim 1, characterized in that: The ratio of the cross-sectional areas of the mold rod 1 (520), the mold rod 2 (530), and the mold rod 3 (540) is the same as the ratio of the cross-sectional areas of the piston rod 1 (511), the piston rod 2 (531), and the piston rod 3 (541).

5. The gear manufacturing equipment for powder metallurgy manufacturing according to claim 2, characterized in that: A horizontal frame (231) is fixedly mounted on the stacking frame (230).

6. The gear manufacturing equipment for powder metallurgy manufacturing according to claim 1, characterized in that: The top end of the second mold rod (530) is provided with an air release hole.

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