A powder metallurgy press forming apparatus with automatic powder feeding

Abstract

The application discloses a powder metallurgy compression molding equipment capable of automatically feeding powder and belongs to the technical field of powder metallurgy compression molding, which comprises an upper die, a lower die and a powder feeding mechanism arranged on the lower die, wherein the powder feeding mechanism comprises a shell, the lower part of the shell is provided with a feeding opening, the outer side wall of the upper part of the shell is an arc-shaped side wall, a feeding pipe is connected to the shell, a movable plate is provided, the inner wall of the movable plate is arc-shaped and is arranged in close contact with the arc-shaped side wall, so that the movable plate can rotate along the arc-shaped side wall, a driving rod is slidably connected to the shell to form a moving pair, the driving rod can drive the shell to move between an initial working position and a powder feeding working position, and the driving rod acts on the movable plate through a transmission member to drive the movable plate to rotate. The powder metallurgy compression molding equipment capable of automatically feeding powder realizes active and dynamic sealing effect in the powder feeding process through a mechanism that linear movement and rotary compression sealing are linked together, and the reliability and cleanliness of the powder feeding process of powder metallurgy are improved.

Description

Technical Field

[0001] This invention belongs to the field of powder metallurgy pressing and molding technology, and particularly relates to an automatic powder feeding powder metallurgy pressing and molding equipment. Background Technology

[0002] Powder metallurgy pressing technology is an important method for manufacturing complex-shaped metal parts in modern industry. In this process, uniformly filling the mold cavity with metal powder is a crucial step in ensuring the quality of the final pressed blank. Currently, the industry commonly uses a feeding shoe as an automatic powder feeding mechanism. After filling, this mechanism typically needs to move horizontally to scrape off excess powder above the cavity, preparing for subsequent pressing.

[0003] However, existing feeding shoe technology has significant problems during operation. To effectively prevent powder leakage from the gap between the shoe and the mold surface during the leveling operation, the bottom of the feeding shoe must have good sealing performance. Currently, conventional sealing methods mainly rely on adding elastic sealing strips or applying additional downward pressure to the entire feeding shoe. These methods are relatively static and passive seals, and their sealing effect is extremely sensitive to component wear, installation accuracy, and the stability of downward pressure. In actual production, powder spillage due to seal failure often occurs. This not only wastes raw materials and pollutes the equipment environment, but also seriously affects the product quality of the pressed blank due to the distortion of the powder ratio in the cavity. Summary of the Invention

[0004] To address the aforementioned shortcomings, the present invention aims to provide an automatic powder metallurgy pressing and molding equipment that can achieve an active and dynamic sealing effect during the powder feeding process through a mechanism that links linear movement with rotary pressing and sealing, thereby improving the reliability and cleanliness of the powder metallurgy powder feeding process.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An automatic powder metallurgy pressing and molding device includes an upper mold, a lower mold, and a powder feeding mechanism disposed on the lower mold, wherein the powder feeding mechanism includes:

[0007] The housing has a feeding port at the bottom and an arc-shaped side wall at the top, and a feeding pipe is connected to the housing.

[0008] A movable plate, wherein the inner wall of the movable plate is arc-shaped and is fitted to the arc-shaped side wall, so that the movable plate can rotate along the arc-shaped side wall;

[0009] A drive rod is slidably connected to the housing to form a sliding pair, and the drive rod can drive the housing to move between the initial working position and the powder feeding position;

[0010] Furthermore, the drive rod acts on the movable plate through a transmission component, causing the movable plate to rotate;

[0011] When the drive rod moves the housing, it also rotates the movable plate to seal the lower end of the housing.

[0012] Preferably, both sides of the housing are fixedly connected with fixing strips, the lower end of the drive rod is fixedly connected with a sliding groove, and the fixing strips are slidably connected in the sliding groove to form a sliding pair.

[0013] Preferably, the transmission component includes a rotating shaft rotatably mounted on the housing, a first gear fixedly connected to the rotating shaft, and an arc-shaped tooth groove on the outer wall of the movable plate, with the first gear meshing in the tooth groove;

[0014] A rack is fixedly connected to the drive rod, and the rack is directly or indirectly connected to the first gear, so that the direction of movement of the rack is opposite to the direction of rotation of the movable plate.

[0015] Preferably, when the rack and the first gear are directly connected by transmission, the rack and the first gear mesh directly, so that when the drive rod moves from the powder feeding station to the initial station, it can drive the end of the movable plate away from the drive rod to rotate downward and fit against the surface of the material table, so as to scrape the powder flat.

[0016] Preferably, the rack has a partially toothed structure. The teeth of the rack only mesh with the first gear when the drive rod moves from the powder feeding station to the initial station. When moving in the opposite direction, the toothless part of the rack disengages from the first gear.

[0017] Preferably, the number of the first gear and the tooth groove is two sets, and the number of the rack is at least one set.

[0018] Preferably, when the rack and the first gear are indirectly connected, a second gear is also fixedly connected to the rotating shaft, and the rack and the second gear are meshed together.

[0019] Preferably, a return spring is connected between the rotating shaft and the housing, and the second gear is fixedly mounted on the rotating shaft via a one-way bearing;

[0020] When the drive rod moves from the powder feeding station to the initial station, the second gear can drive the shaft to rotate through the one-way bearing, so that the reset spring stores elastic potential energy; when the drive rod moves in the opposite direction, the second gear spins freely, and the reset spring releases elastic potential energy to reset the shaft.

[0021] Preferably, both ends of the movable plate are provided with elastic elements.

[0022] Preferably, scraping gaps are provided at both ends of the housing.

[0023] In summary, the technical effects and advantages of this invention are as follows: This automatic powder feeding powder metallurgy pressing and molding equipment features a rotatable movable plate at the upper end of the feeding mechanism's housing. Through the ingenious design of the drive rod and transmission components, the linear motion of the drive housing between the "initial position" and the "powder feeding position" is synchronously converted into the rotational motion of the movable plate. This rotational force causes the lower end of the movable plate to naturally and tightly press against the surface of the lower mold, forming a reliable sealing interface and effectively preventing powder leakage from the side. This allows the sealing force to be adaptive, providing a more proactive and reliable response to working conditions compared to traditional fixed sealing methods. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the feeding mechanism in this invention;

[0026] Figure 3 This is a schematic diagram showing the positional relationship between the movable plate and the shell in this invention;

[0027] Figure 4 This is a schematic diagram showing the positional relationship between the drive rod and the slide groove in this invention;

[0028] Figure 5 This is a schematic diagram of the internal structure of the shell in this invention;

[0029] Figure 6 This is a schematic diagram showing the positional relationship between the second gear and the rack in this invention.

[0030] In the diagram: 1. Powder feeding mechanism; 11. Housing; 12. Movable plate; 13. Drive rod; 14. Feeding pipe; 15. Transmission component;

[0031] 111. Fixing strip; 112. Limiting protrusion; 113. Arc-shaped sidewall; 114. Scraping gap;

[0032] 121. Clearance groove; 122. Tooth groove; 123. Elastic element; 131. Slide groove;

[0033] 151. Shaft; 152. First gear; 153. Rack; 154. Second gear; 155. One-way bearing. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0035] The inventors of this invention have discovered a problem with the sealing of existing feeding boots (powder feeding mechanisms) when leveling powder in traditional powder metallurgy pressing equipment. Traditional methods, such as adding sealing strips or applying downward pressure, are insufficient to control the dynamic seal between the boot body and the lower die surface, easily leading to powder leakage.

[0036] Based on this discovery, the present invention proposes a novel approach: adopting an active, dynamic sealing mechanism linked to the action stroke, which achieves an active and dynamic sealing effect during the powder feeding process, significantly improving the reliability and cleanliness of the powder metallurgy powder feeding process.

[0037] like Figures 1-2 As shown, in one embodiment of the present invention, an automatic powder metallurgy pressing and molding equipment includes an upper mold, a lower mold, and a powder feeding mechanism 1 disposed on the lower mold. The powder feeding mechanism 1 includes:

[0038] The housing 11 has a feeding port at the bottom and an arc-shaped sidewall 113 at the top. A feeding pipe 14 is connected to the housing 11. The input end of the feeding pipe 14 is connected to an external feeding unit, and the output end of the feeding pipe 14 is connected to the feeding port, used to feed the powder pressed each time into the mold cavity.

[0039] The movable plate 12 has an arc-shaped inner wall that fits against the arc-shaped side wall 113, allowing it to rotate along the arc-shaped side wall 113. Limiting protrusions 112 are provided on both sides of the housing 11 in the direction of movement to restrict the position of the movable plate 12 and prevent it from detaching from the side of the housing 11. Furthermore, to accommodate the feeding pipe 14, a clearance groove 121 is provided in the middle of the movable plate 12 to prevent interference between the movable plate 12 and the feeding pipe 14 during rotation.

[0040] The drive rod 13 is slidably connected to the housing 11, forming a sliding pair. The drive rod 13 can drive the housing 11 to move between the initial station and the powder feeding station. The other end of the drive rod 13 is connected to the drive source in the molding equipment, enabling the drive rod 13 to reciprocate.

[0041] Furthermore, the drive rod 13 acts on the movable plate 12 through the transmission component 15, causing the movable plate 12 to rotate. In other words, when the drive rod 13 moves the housing 11, it simultaneously drives the movable plate 12 to rotate, thereby sealing the lower end of the housing 11.

[0042] In this invention, a rotatable movable plate 12 is provided at the upper end of the housing 11, and the drive rod 13 and the movable plate 12 are linked by a transmission component 15, converting the linear motion of the housing 11 moving between the "initial position" and the "powder feeding position" into the rotational motion of the movable plate 12. When the housing 11 moves, the movable plate 12 is in a rotating state, and its lower end is naturally and tightly pressed against the surface of the lower mold by this rotational force, forming a reliable sealing interface, effectively preventing powder leakage from the rear of the movement direction. This makes the sealing action force adaptive, and compared with traditional fixed sealing methods, it can more actively and reliably adapt to the working conditions.

[0043] Furthermore, both ends of the movable plate 12 are provided with elastic elements 123, which are elastic rubber strips or air bladders, etc. When the movable plate 12 is in the centered state, the elastic elements 123 at both ends are in a compressed state, so that the elastic elements 123 on both sides are in contact with the lower mold surface, thus isolating the interior of the housing 11 from the external space. When the movable plate 12 rotates, the downward rotating elastic element 123 acts downward on the lower mold surface and deforms, so that it is completely in contact with the lower mold surface, thereby enhancing its airtightness and strengthening the leveling effect on the powder. The upward rotating elastic element 123 is in a slightly compressed state and is slightly in contact with the lower mold surface, ensuring the airtightness of the housing 11.

[0044] like Figures 2-3 As shown, in one embodiment of the present invention, fixing strips 111 are fixedly connected to both sides of the housing 11, and a sliding groove 131 is fixedly connected to the lower end of the drive rod 13. The upper end of the fixing strip 111 is inserted into the sliding groove 131, so that the fixing strip 111 is slidably connected in the sliding groove 131 to form a sliding pair.

[0045] like Figures 4-6 As shown, in one embodiment of the present invention, the transmission component 15 includes a rotating shaft 151 rotatably mounted on the housing 11. Preferably, the rotating shaft 151 is rotatably mounted between two fixed bars 111. A first gear 152 is fixedly connected to the rotating shaft 151. The outer wall of the movable plate 12 is provided with an arc-shaped tooth groove 122, the center of which coincides with the center of the movable plate 12. The first gear 152 meshes with the tooth groove 122.

[0046] A rack 153 is fixedly connected to the drive rod 13. The rack 153 and the first gear 152 are directly or indirectly connected by transmission, so that the moving direction of the rack 153 is opposite to the rotating direction of the movable plate 12.

[0047] Therefore, when the drive rod 13 moves the rack 153, the rack 153 will drive the first gear 152 to rotate, and the first gear 152 will drive the movable plate 12 to rotate. It should be noted that when the drive rod 13 moves forward, it will cause the movable plate 12 to rotate backward under the action of the first gear 152.

[0048] In other words, the movable plate 12 will enhance the sealing behind the housing 11 when it moves. That is, whether it moves from the initial station to the feeding station or from the feeding station to the initial station, the movable plate 12 will always act on the rear of the housing 11 in the direction of movement to seal it.

[0049] In this embodiment, when the rack 153 and the first gear 152 are directly connected, the rack 153 and the first gear 152 directly mesh. In this embodiment, the rack 153 is a full rack structure, and the rack 153 is always meshed with the first gear 152. When the drive rod 13 moves from the powder feeding station to the initial station, it can drive the end of the movable plate 12 away from the drive rod 13 to rotate downward, so that the elastic element 123 on that side fully fits against the surface of the material table, and scrapes the powder level. When the drive rod 13 moves from the initial station to the powder feeding station, it can drive the end of the movable plate 12 away from the drive rod 13 to rotate downward, so that the elastic element 123 on that side fully fits against the surface of the material table, and cleans the surface of the lower mold.

[0050] In the above scheme, if the powder quantity is controlled accurately, it is not necessary to clean the lower mold surface every time, thus avoiding unnecessary energy consumption. To address this requirement, in one embodiment, the rack 153 has a partially toothed structure. The teeth of the rack 153 only engage with the first gear 152 when the drive rod 13 moves from the powder feeding station to the initial station. When moving in the opposite direction, the toothless part of the rack 153 disengages from the first gear 152. In other words, this structure achieves unidirectional power output, ensuring that the movable plate 12 does not rotate when scraping is not required.

[0051] To improve structural stability, there are two sets of first gears 152 and tooth grooves 122, and at least one set of racks 153. In this embodiment, the number of racks 153 corresponds to the number of first gears 152, and there are two sets.

[0052] In this embodiment, when the rack 153 and the first gear 152 are indirectly connected, a second gear 154 is also fixedly connected to the rotating shaft 151, and the rack 153 meshes with the second gear 154. In this embodiment, the second gear 154 is fixedly connected to the middle of the rotating shaft 151, and the rack 153 is also correspondingly located in the middle. By setting the second gear 154, the wear of the first gear 152 can be reduced, thereby extending its service life.

[0053] Furthermore, in this embodiment, when faced with the situation that if the powder amount is controlled more precisely, it is not necessary to clean the surface of the lower mold every time, thus avoiding unnecessary energy consumption, this embodiment provides the following solution: a return spring is connected between the rotating shaft 151 and the housing 11. The return spring is specifically a torsion spring, which is connected between the rotating shaft 151 and the fixing bar 111. The second gear 154 is fixedly installed on the rotating shaft 151 through a one-way bearing 155.

[0054] When the drive rod 13 moves from the powder feeding station to the initial station, the second gear 154 can drive the rotating shaft 151 to rotate through the one-way bearing 155, so that the reset spring stores elastic potential energy; when the drive rod 13 moves in the opposite direction, the second gear 154 rotates freely, and the reset spring releases elastic potential energy to reset the rotating shaft 151.

[0055] In other words, this embodiment achieves unidirectional power transmission through the one-way bearing 155 and resets the rotating shaft 151 based on the reset spring, so that the movable plate 12 will not rotate when the housing 11 does not need to scrape material.

[0056] In the above embodiments, such as Figure 3 , Figure 5 As shown, scraping gaps 114 are provided at both ends of the housing 11. The height of the scraping gaps 114 is 0.8mm-1.2mm. The function of setting the scraping gaps 114 is to pre-scrape and flatten the powder with a thicker thickness, so as to facilitate thorough scraping by the subsequent moving plate 12 and elastic element 123. At the same time, since the scraping gaps 114 are in direct contact with the powder, they do not increase the moving resistance of the housing 11.

[0057] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automatic powder metallurgy pressing and molding equipment, comprising an upper mold, a lower mold, and a powder feeding mechanism disposed on the lower mold, characterized in that, The powder feeding mechanism includes: The housing has a feeding port at the bottom and an arc-shaped side wall at the top, and a feeding pipe is connected to the housing. A movable plate, wherein the inner wall of the movable plate is arc-shaped and is fitted to the arc-shaped side wall, so that the movable plate can rotate along the arc-shaped side wall; A drive rod is slidably connected to the housing to form a sliding pair, and the drive rod can drive the housing to move between the initial working position and the powder feeding position; Furthermore, the drive rod acts on the movable plate through a transmission component, causing the movable plate to rotate; When the drive rod moves the housing, it also drives the movable plate to rotate to seal the lower end of the housing; Both sides of the housing are fixedly connected with fixing strips, and the lower end of the drive rod is fixedly connected with a sliding groove. The fixing strips are slidably connected in the sliding groove to form a sliding pair. The transmission component includes a rotating shaft rotatably mounted on the housing, a first gear fixedly connected to the rotating shaft, and an arc-shaped tooth groove on the outer wall of the movable plate, the first gear meshing with the tooth groove. A rack is fixedly connected to the drive rod, and the rack is directly or indirectly connected to the first gear, so that the direction of movement of the rack is opposite to the direction of rotation of the movable plate.

2. The powder metallurgy pressing and molding equipment with automatic powder feeding according to claim 1, characterized in that, When the rack and the first gear are directly connected, the rack and the first gear mesh directly, so that when the drive rod moves from the powder feeding station to the initial station, it can drive the end of the movable plate away from the drive rod to rotate downward and fit against the surface of the material table, thus leveling the powder.

3. The powder metallurgy pressing and molding equipment with automatic powder feeding according to claim 2, characterized in that, The rack has a partially toothed structure. The teeth of the rack only mesh with the first gear when the drive rod moves from the powder feeding station to the initial station. When it moves in the opposite direction, the toothless part of the rack disengages from the first gear.

4. The powder metallurgy pressing and molding equipment with automatic powder feeding according to claim 3, characterized in that, The first gear and the number of tooth grooves are two sets, and the number of racks is at least one set.

5. The powder metallurgy pressing and molding equipment with automatic powder feeding according to claim 1, characterized in that, When the rack and the first gear are indirectly connected, a second gear is also fixedly connected to the rotating shaft, and the rack and the second gear are meshed together.

6. The powder metallurgy pressing and molding equipment with automatic powder feeding according to claim 5, characterized in that, A return spring is connected between the rotating shaft and the housing, and the second gear is fixedly mounted on the rotating shaft by a one-way bearing; When the drive rod moves from the powder feeding station to the initial station, the second gear can drive the shaft to rotate through the one-way bearing, so that the reset spring stores elastic potential energy; when the drive rod moves in the opposite direction, the second gear spins freely, and the reset spring releases elastic potential energy to reset the shaft.

7. An automatic powder feeding powder metallurgy pressing and molding equipment according to any one of claims 1-6, characterized in that, Both ends of the movable plate are equipped with elastic elements.

8. An automatic powder feeding powder metallurgy pressing and molding equipment according to any one of claims 1-6, characterized in that, Both ends of the housing are provided with scraping gaps.

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