Porous exhaust powder injection mold

Abstract

The utility model relates to the technical field of injection molds, and discloses a multi-hole exhaust powder injection mold which comprises a lower mold, an upper mold is clamped at the top of the lower mold, a lower mold groove is formed in the top of the lower mold, an upper mold groove is formed in the bottom of the upper mold, an injection pipe is installed in the upper mold, and an air outlet is formed in the upper mold. The top of the upper mold groove communicates with an exhaust groove, the top of the exhaust groove communicates with a connecting pipe, the top of the connecting pipe communicates with a suction pipe, the interior of the upper mold is rotationally connected with a first sealing plate, and the interior of the upper mold is rotationally connected with a second sealing plate. The problems that when an existing injection mold is used, a passive exhaust method is generally adopted, for example, an exhaust groove is formed in the edge of a cavity, air in the exhaust groove cannot be completely exhausted, air which is not exhausted is possibly wrapped in the exhaust groove in the curing process of a plastic melt or a metal powder mixture, air holes or cavities are formed, and the service life of the injection mold is influenced are solved. The strength and the durability of the product can be obviously reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a multi-hole exhaust powder injection mold. Background Technique

[0002] A powder injection mold is a new powder metallurgy near-net shaping technology that introduces modern plastic injection molding technology into the field of powder metallurgy. This technology uses a mold to uniformly mix metal powder and an organic binder, and then injects the mixture into the mold cavity at high temperature through an injection molding machine. After steps such as solidification forming, debinding, and sintering, a structural part with high density, high precision, and three-dimensional complex shape is finally obtained.

[0003] When existing injection molds are in use, they generally adopt a passive exhaust method, such as opening exhaust grooves at the edge of the cavity. The air inside cannot be completely exhausted, and the unexhausted air may be wrapped during the solidification process of the plastic melt or metal powder mixture, forming pores or cavities, which will significantly reduce the strength and durability of the product and is not convenient for users to use. Content of the Utility Model

[0004] The utility model provides a multi-hole exhaust powder injection mold, which has the beneficial effect of being able to extract the air in the cavity, and solves the problem that existing injection molds generally adopt a passive exhaust method when in use, such as opening exhaust grooves at the edge of the cavity. The air inside cannot be completely exhausted, and the unexhausted air may be wrapped during the solidification process of the plastic melt or metal powder mixture, forming pores or cavities, which will significantly reduce the strength and durability of the product.

[0005] The utility model provides the following technical scheme: a multi-hole exhaust powder injection mold, including a lower mold, the top of the lower mold is clamped with an upper mold, a lower mold groove is opened at the top of the lower mold, an upper mold groove is opened at the bottom of the upper mold, an injection pipe is installed inside the upper mold, the top of the upper mold groove is communicated with an exhaust groove, the top of the exhaust groove is communicated with a connecting pipe, the top of the connecting pipe is communicated with a suction pipe, a first sealing plate is rotatably connected inside the upper mold, a second sealing plate is rotatably connected inside the upper mold, and a transmission mechanism is fixedly connected inside the first sealing plate.

[0006] As an optional scheme of the multi-hole exhaust powder injection mold of the utility model, among them: the transmission mechanism includes a first connecting shaft, the first sealing plate is rotatably connected with the upper mold through the first connecting shaft, a second connecting shaft is fixedly connected inside the second sealing plate, and the second sealing plate is rotatably connected with the upper mold through the second connecting shaft.

[0007] As an alternative solution of the porous exhaust powder injection mold described in the present utility model, wherein: one end of the first connecting shaft is fixedly connected with a first pulley, a second pulley is arranged on one side of the first pulley, the first pulley and the second pulley are connected by belt drive, one end of the second pulley is fixedly connected with a first gear, and a second gear is meshed and connected on one side of the first gear.

[0008] As an alternative solution of the porous exhaust powder injection mold described in the present utility model, wherein: both the first gear and the second gear are rotatably connected to the inner wall of the upper mold through a rotating shaft, a third pulley is fixedly connected to one side of the second gear, one end of the second connecting shaft is fixedly connected with a fourth pulley, and the third pulley and the fourth pulley are connected by belt drive.

[0009] As an alternative solution of the porous exhaust powder injection mold described in the present utility model, wherein: the number of the second sealing plates is two, a convex block is fixedly connected to one side of one of the second sealing plates, a groove is formed on one side of the other second sealing plate, and the convex block is in clearance fit with the groove.

[0010] As an alternative solution of the porous exhaust powder injection mold described in the present utility model, wherein: a toothed plate is meshed and connected to one side of the first gear, and a first connecting plate is fixedly connected to the top of the toothed plate.

[0011] As an alternative solution of the porous exhaust powder injection mold described in the present utility model, wherein: a sliding groove is formed inside the upper mold, the top of the first connecting plate extends into the sliding groove and is fixedly connected with an iron plate, and a magnet block is fixedly connected to the top of the inner wall of the sliding groove.

[0012] As an alternative solution of the porous exhaust powder injection mold described in the present utility model, wherein: the iron plate is fixedly connected with a second connecting plate at the top, and the top of the second connecting plate penetrates through the top of the upper mold and is fixedly connected with a handle.

[0013] The present utility model has the following beneficial effects:

[0014] 1. The porous exhaust powder injection mold is provided with a suction pipe, a connecting pipe and an exhaust groove. By connecting the suction pipe to an external vacuum pump, the vacuum pump can extract the gas between the upper mold cavity and the lower mold cavity through the suction pipe, the connecting pipe and the exhaust groove. When the suction pipe sucks the gas, it will drive the first sealing plate to swing upward and fit against the inner wall of the exhaust groove. Subsequently, the transmission mechanism drives the second sealing plate to swing upward to close the injection pipe, preventing the injection pipe from exhausting gas into the cavity when the upper and lower mold cavities are being evacuated. This can ensure that the vacuum pump completely evacuates the gas in the cavity, preventing air from being enclosed during the solidification of the plastic melt or metal powder mixture, thus forming pores or voids and improving the strength and durability of the product.

[0015] 2. The porous exhaust powder injection mold is provided with a toothed plate and a handle. When the first sealing plate is sucked upward, the magnet block generates a suction force on the iron plate, causing the iron plate to continue moving upward and fit against the magnet block. At this time, the toothed plate drives the first sealing plate to continue moving upward through the first gear until it fits against the inner wall of the exhaust groove, ensuring the smoothness of the exhaust groove and further improving the exhaust efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the present utility model.

[0017] Figure 2 It is a schematic cross-sectional structural diagram of the upper and lower molds of the present utility model.

[0018] Figure 3 It is a schematic structural diagram of the first sealing plate and the second sealing plate of the present utility model.

[0019] Figure 4 It is a schematic structural diagram of the toothed plate and the first connecting button of the present utility model.

[0020] Figure 5 For the present utility model Figure 2 The enlarged structural diagram at position A.

[0021] In the figure: 1. Lower mold; 2. Upper mold; 3. Lower mold cavity; 4. Upper mold cavity; 5. Injection pipe; 6. Exhaust groove; 7. Connecting pipe; 8. Suction pipe; 9. First sealing plate; 10. Second sealing plate; 1101. First connecting shaft; 1102. Second connecting shaft; 1103. First pulley; 1104. Second pulley; 1105. First gear; 1106. Second gear; 12. Third pulley; 13. Fourth pulley; 14. Convex block; 15. Groove; 16. Toothed plate; 17. First connecting plate; 18. Sliding groove; 19. Iron plate; 20. Magnet block; 21. Second connecting plate; 22. Handle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the protection scope of the present utility model.

[0023] Embodiment 1

[0024] Please refer to Figures 1 to 5 , a porous exhaust powder injection mold, including a lower mold 1, an upper mold 2 is clamped on the top of the lower mold 1, a lower mold groove 3 is opened on the top of the lower mold 1, an upper mold groove 4 is opened on the bottom of the upper mold 2, an injection pipe 5 is installed inside the upper mold 2, an exhaust groove 6 is communicated with the top of the upper mold groove 4, a connecting pipe 7 is communicated with the top of the exhaust groove 6, a suction pipe 8 is communicated with the top of the connecting pipe 7, a first sealing plate 9 is rotatably connected inside the upper mold 2, a second sealing plate 10 is rotatably connected inside the upper mold 2, and a transmission mechanism is fixedly connected inside the first sealing plate 9.

[0025] The transmission mechanism includes a first connecting shaft 1101, the first sealing plate 9 is rotatably connected to the upper mold 2 through the first connecting shaft 1101, a second connecting shaft 1102 is fixedly connected inside the second sealing plate 10, and the second sealing plate 10 is rotatably connected to the upper mold 2 through the second connecting shaft 1102.

[0026] One end of the first connecting shaft 1101 is fixedly connected with a first belt pulley 1103, a second belt pulley 1104 is arranged on one side of the first belt pulley 1103, the first belt pulley 1103 and the second belt pulley 1104 are connected by belt transmission, one end of the second belt pulley 1104 is fixedly connected with a first gear 1105, and a second gear 1106 is meshed and connected on one side of the first gear 1105.

[0027] Both the first gear 1105 and the second gear 1106 are rotatably connected to the inner wall of the upper mold 2 through a rotating shaft, a third belt pulley 12 is fixedly connected to one side of the second gear 1106, a fourth belt pulley 13 is fixedly connected to one end of the second connecting shaft 1102, and the third belt pulley 12 and the fourth belt pulley 13 are connected by belt transmission.

[0028] Working principle of this embodiment: Before injecting powder into the injection mold, it is necessary to exhaust the air in the mold cavity. When exhausting the gas, first connect the external vacuum pump to the suction pipe 8, so that the vacuum pump extracts the gas between the upper mold cavity 4 and the lower mold cavity 3 through the suction pipe 8, the connecting pipe 7 and the exhaust groove 6. When the suction pipe 8 sucks the gas, the first sealing plate 9 will be pulled upward, so that the first sealing plate 9 swings upward around the first connecting shaft 1101 and fits against the inner wall of the exhaust groove 6. At this time, while the air between the upper mold cavity 4 and the lower mold cavity 3 is extracted by the vacuum pump, with the rotation of the first connecting shaft 1101, the first connecting shaft 1101 drives the first pulley 1103 to rotate. The first pulley 1103 drives the second pulley 1104 to rotate through the belt, and the second pulley 1104 drives the first gear 1105 to rotate. The meshing of the first gear 1105 and the second gear 1106 drives the second gear 1106 to rotate in the reverse direction. The second gear 1106 drives the third pulley 12 to rotate, the third pulley 12 drives the fourth pulley 13 to rotate through the belt, and the fourth pulley 13 drives the second connecting shaft 1102 to rotate. The second connecting shaft 1102 will drive the second sealing plate 10 to swing upward. After the two second sealing plates 10 swing upward, they overlap together, thereby closing the injection pipe 5. At this time, no air will be input into the upper mold cavity 4 and the lower mold cavity 3 from the injection pipe 5, preventing the injection pipe 5 from exhausting air into the cavity when the upper mold cavity 4 and the lower mold cavity 3 are being evacuated, and thus ensuring that the vacuum pump can completely exhaust the gas in the cavity. After the exhaust, pour the powder into the injection pipe 5 to open the second sealing plate 10 downward. During the process of the second sealing plate 10 opening downward, the first sealing plate 9 will also close downward, preventing gas from entering the upper mold cavity 4 and the lower mold cavity 3 from the exhaust groove 6 during the powder injection process, and thus preventing air from being wrapped inside during the curing process of the plastic melt or metal powder mixture, forming pores or cavities, and improving the strength and durability of the product.

[0029] Embodiment Two

[0030] This embodiment is an improvement made on the basis of Embodiment One. Specifically, please refer to Figures 1 to 5 , the number of the second sealing plates 10 is two. A convex block 14 is fixedly connected to one side of one of the second sealing plates 10, and a groove 15 is formed on one side of the other second sealing plate 10. The convex block 14 and the groove 15 are in clearance fit.

[0031] By setting the convex block 14 and the groove 15, the clearance between the two first closing plates can be bent and offset through the cooperation of the convex block 14 and the groove 15, making it difficult for air to flow through and ensuring the efficiency of exhausting the air in the suction cavity.

[0032] A rack 16 is meshed and connected to one side of the first gear 1105, and a first connecting plate 17 is fixedly connected to the top of the rack 16.

[0033] The interior of the upper mold 2 is provided with a sliding groove 18. The top of the first connecting plate 17 extends into the interior of the sliding groove 18 and is fixedly connected to an iron plate 19. The top of the inner wall of the sliding groove 18 is fixedly connected to a magnet block 20.

[0034] The top of the iron plate 19 is fixedly connected to a second connecting plate 21. The top of the second connecting plate 21 penetrates through the top of the upper mold 2 and is fixedly connected to a handle 22.

[0035] By providing the toothed plate 16 and the handle 22, when the first sealing plate 9 is suctioned upward, the suction force may not be able to make the erected first sealing plate 9 fit against the inner wall of the exhaust groove 6. While the first sealing plate 9 drives the first gear 1105 to rotate, the first gear 1105 drives the toothed plate 16 to move upward. The toothed plate 16 pushes the first connecting plate 17 to move upward, and the iron plate 19 at the top of the first connecting plate 17 moves upward accordingly. When the first sealing plate 9 cannot move upward, the magnet block 20 generates a suction force on the iron plate 19, causing the iron plate 19 to continue moving upward to fit against the magnet block 20. At this time, the toothed plate 16 will drive the first sealing plate 9 to continue moving upward through the first gear 1105 until it fits against the inner wall of the exhaust groove 6 to ensure the smoothness of the exhaust groove 6 and improve the exhaust efficiency. Moreover, when the powder is injected through the injection tube 5, in order to prevent the second sealing plate 10 from not being able to rotate completely downward and fit against the inner wall of the injection tube 5, the handle 22 can be moved downward. The handle 22 pushes the iron plate 19 to move downward through the second connecting plate 21, thereby driving the second sealing plate 10 to move downward and completely fit against the inner wall of the injection tube 5 to prevent the second sealing plate 10 from affecting the injection of the powder and improve the injection efficiency.

[0036] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0037] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A porous exhaust powder injection mold, comprising a lower mold (1), characterized in that: The top of the lower mold (1) is snap-connected with an upper mold (2). A lower mold cavity (3) is formed at the top of the lower mold (1), and an upper mold cavity (4) is formed at the bottom of the upper mold (2). An injection pipe (5) is installed inside the upper mold (2). The top of the upper mold cavity (4) is communicated with an exhaust groove (6). The top of the exhaust groove (6) is communicated with a connecting pipe (7). The top of the connecting pipe (7) is communicated with a suction pipe (8). A first sealing plate (9) is rotatably connected inside the upper mold (2), and a second sealing plate (10) is rotatably connected inside the upper mold (2). A transmission mechanism is fixedly connected inside the first sealing plate (9).

2. The porous exhaust powder injection mold according to claim 1, wherein: The transmission mechanism includes a first connecting shaft (1101). The first sealing plate (9) is rotatably connected to the upper mold (2) through the first connecting shaft (1101). A second connecting shaft (1102) is fixedly connected inside the second sealing plate (10). The second sealing plate (10) is rotatably connected to the upper mold (2) through the second connecting shaft (1102).

3. The porous exhaust powder injection mold according to claim 2, characterized in that: One end of the first connecting shaft (1101) is fixedly connected with a first pulley (1103). A second pulley (1104) is arranged on one side of the first pulley (1103). The first pulley (1103) and the second pulley (1104) are connected by a belt drive. One end of the second pulley (1104) is fixedly connected with a first gear (1105). A second gear (1106) is meshed and connected to one side of the first gear (1105).

4. The porous exhaust powder injection mold according to claim 3, characterized in that: Both the first gear (1105) and the second gear (1106) are rotatably connected to the inner wall of the upper mold (2) through a rotating shaft. A third pulley (12) is fixedly connected to one side of the second gear (1106). One end of the second connecting shaft (1102) is fixedly connected with a fourth pulley (13). The third pulley (12) and the fourth pulley (13) are connected by a belt drive.

5. The porous exhaust powder injection mold according to claim 1, characterized in that: The number of the second sealing plates (10) is two. A convex block (14) is fixedly connected to one side of one of the second sealing plates (10), and a groove (15) is formed on one side of the other second sealing plate (10). The convex block (14) is in clearance fit with the groove (15).

6. The porous exhaust powder injection mold according to claim 3, characterized in that: A toothed plate (16) is meshed and connected to one side of the first gear (1105). A first connecting plate (17) is fixedly connected to the top of the toothed plate (16).

7. The porous exhaust powder injection mold according to claim 6, wherein: A sliding groove (18) is formed inside the upper mold (2). The top of the first connecting plate (17) extends into the sliding groove (18) and is fixedly connected with an iron plate (19). A magnet block (20) is fixedly connected to the top of the inner wall of the sliding groove (18).

8. The porous exhaust powder injection mold according to claim 7, characterized in that: A second connecting plate (21) is fixedly connected to the top of the iron plate (19). The top of the second connecting plate (21) penetrates through the top of the upper mold (2) and is fixedly connected with a handle (22).

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