Device for solving air trapping caused by non-injection of metal powder

Abstract

The utility model relates to the technical field of powder injection, and discloses a device for solving air trapping caused by non-injection of metal powder, which comprises a lower die, an upper die is clamped at the top of the lower die, a connecting seat is fixedly connected with the top of the upper die, and first injection pipes are communicated with two ends of the connecting seat. A first injection pipe is fixedly installed in the upper mold, a second injection pipe is fixedly installed in the upper mold, the first injection pipe communicates with the second injection pipe, a fixing base is arranged in the second injection pipe, a stirring helical ribbon is fixedly connected to the top of the fixing base, and a pressing plate is fixedly connected to the top of the stirring helical ribbon; and the top of the pressing plate is rotationally connected with the top of the inner wall of the second injection pipe, and a driving mechanism is embedded into the connecting base. According to the device for solving the problem of air trapping during non-injection of the metal powder, the injected flowing metal powder is stirred to be more uniformly distributed in the second injection pipe and the mold, gaps and bubbles among powder particles are reduced, and the air trapping phenomenon is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of powder injection, in particular to a device for solving the problem of air entrapment in metal powder injection. Background Technique

[0002] Metal powder injection molding technology is a new type of powder metallurgy near-net shape forming technology formed by introducing modern plastic injection molding technology into the field of powder metallurgy. Its process principle is to mix metal powder into a specific injection molding material, and inject it into a mold through an injection molding machine to form the required surface shape of the part. In this process, the metal powder is heated and pressurized to form a uniform metal component, and it is solidified through heat treatment and cooling steps to finally obtain the required metal part.

[0003] During the existing metal powder injection process, the air in the mold cavity cannot be discharged in time due to the rapid injection of metal powder, and then it will be wrapped by the material to the inner wall of the mold, finally forming an air entrapment phenomenon. The trapped gas will form tiny air cavities or pores after being compressed in the mold, which will be manifested as depressions or holes on the surface of the product, affecting the quality of the finished product. Content of the Utility Model

[0004] The utility model provides a device for solving the problem of air entrapment in metal powder injection, which has the beneficial effect of being able to stir and exhaust air when injecting metal powder, and solves the problem that during the existing metal powder injection process, the air in the mold cavity cannot be discharged in time due to the rapid injection of metal powder, and then it will be wrapped by the material to the inner wall of the mold, finally forming an air entrapment phenomenon. The trapped gas will form tiny air cavities or pores after being compressed in the mold, which will be manifested as depressions or holes on the surface of the product, affecting the quality of the finished product.

[0005] The utility model provides the following technical solution: A device for solving the problem of air entrapment in metal powder injection includes a lower mold, the top of the lower mold is clamped with an upper mold, the top of the upper mold is fixedly connected with a connecting seat, both ends of the connecting seat are communicated with a first injection pipe, a second injection pipe is fixedly installed inside the upper mold, the first injection pipe is communicated with the second injection pipe, a fixed seat is arranged inside the second injection pipe, a stirring spiral belt is fixedly connected to the top of the fixed seat, a pressing plate is fixedly connected to the top of the stirring spiral belt, the top of the pressing plate is rotatably connected to the top inner wall of the second injection pipe, a driving mechanism is embedded inside the connecting seat, and the driving mechanism can drive the stirring spiral belt to rotate.

[0006] As an alternative solution for the device described in the present utility model for solving the problem of air entrapment in metal powder injection, the following is provided: The driving mechanism includes a motor, the output end of the motor is fixedly connected with a first connecting column, the pressing plate is fixedly connected with the first connecting column, and the bottom of the first connecting column is slidably connected with a second connecting column.

[0007] As an alternative solution for the device described in the present utility model for solving the problem of air entrapment in metal powder injection, the following is provided: The bottom of the second connecting column is fixedly connected with a fixed seat, a connecting groove is opened at the bottom of the first connecting column, and the connecting groove is in clearance fit with the second connecting column.

[0008] As an alternative solution for the device described in the present utility model for solving the problem of air entrapment in metal powder injection, the following is provided: A convex plate is fixedly connected to the outside of the second connecting column, grooves are opened on both sides of the inner wall of the connecting groove, and the grooves are in clearance fit with the convex plate.

[0009] As an alternative solution for the device described in the present utility model for solving the problem of air entrapment in metal powder injection, the following is provided: A screw sleeve is fixedly connected to the top of the inner wall of the connecting groove, and a screw rod is threadedly connected inside the screw sleeve.

[0010] As an alternative solution for the device described in the present utility model for solving the problem of air entrapment in metal powder injection, the following is provided: The bottom of the screw rod extends to the bottom of the second connecting column and is fixedly connected with a fixing block, and the top of the fixing block is rotatably connected with the bottom of the fixed seat.

[0011] As an alternative solution for the device described in the present utility model for solving the problem of air entrapment in metal powder injection, the following is provided: An adjusting plate is fixedly connected to the outside of the fixing block, the number of the adjusting plates is several, and several of the adjusting plates are evenly distributed in a ring at equal intervals.

[0012] As an alternative solution for the device described in the present utility model for solving the problem of air entrapment in metal powder injection, the following is provided: A limiting ring is rotatably connected to the outside of the pressing plate, and the top of the limiting ring is fixedly connected with the top of the inner wall of the second injection tube.

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

[0014] 1. For the device for solving the problem of air entrapment in metal powder injection, by setting the stirring spiral belt and the driving mechanism, the flowing metal powder during injection can be stirred to make it more evenly distributed in the second injection tube and the mold, reducing the voids and bubbles between the powder particles, thereby improving the fluidity of the powder. After improving the powder fluidity, it helps the metal powder to more smoothly enter the mold through the second injection tube, reducing the gas entrapment caused by poor flow, and further preventing the occurrence of air entrapment during the metal powder process, improving the quality of the metal finished product.

[0015] 2. The device for solving the gas entrapment problem in metal powder injection is provided with a limiting ring. The limiting ring can play a limiting role outside the pressing plate, making it difficult for the pressing plate to shake and shift when rotating, and improving the stability of the pressing plate during rotation. 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 mold of the present utility model.

[0018] Figure 3 It is a schematic cross-sectional structural diagram of the second injection tube of the present utility model.

[0019] Figure 4 It is a schematic cross-sectional structural diagram of the fixed seat and the first connecting column of the present utility model.

[0020] In the figure: 1. Lower mold; 2. Upper mold; 3. Connecting seat; 4. First injection tube; 5. Second injection tube; 6. Fixed seat; 7. Stirring spiral ribbon; 8. Pressing plate; 901. Motor; 902. First connecting column; 903. Second connecting column; 904. Connecting groove; 905. Convex plate; 906. Groove; 10. Screw sleeve; 11. Screw; 12. Fixed block; 13. Adjusting plate; 14. Limiting ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] 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 the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Embodiment 1

[0023] Please refer to Figures 1 to 4 , a device for solving the gas entrapment problem in metal powder injection, including a lower mold 1. The top of the lower mold 1 is clamped with an upper mold 2. The top of the upper mold 2 is fixedly connected with a connecting seat 3. Both ends of the connecting seat 3 are communicated with a first injection tube 4. A second injection tube 5 is fixedly installed inside the upper mold 2. The first injection tube 4 is communicated with the second injection tube 5. A fixed seat 6 is arranged inside the second injection tube 5. The top of the fixed seat 6 is fixedly connected with a stirring spiral ribbon 7. The stirring spiral ribbon 7 is arranged in a spiral strip shape. The top of the stirring spiral ribbon 7 is fixedly connected with a pressing plate 8. The top of the pressing plate 8 is rotatably connected with the top inner wall of the second injection tube 5. A driving mechanism is embedded inside the connecting seat 3, and the driving mechanism can drive the stirring spiral ribbon 7 to rotate.

[0024] The driving mechanism includes a motor 901. A first connecting column 902 is fixedly connected to the output end of the motor 901. The inner side of the pressing plate 8 is fixedly connected to the first connecting column 902. The bottom of the first connecting column 902 is slidably connected to a second connecting column 903.

[0025] The bottom of the second connecting column 903 is fixedly connected to the fixed seat 6. A connecting groove 904 is formed at the bottom of the first connecting column 902. The connecting groove 904 is in clearance fit with the second connecting column 903.

[0026] A convex plate 905 is fixedly connected to the outer side of the second connecting column 903. Grooves 906 are formed on both sides of the inner wall of the connecting groove 904. The grooves 906 are in clearance fit with the convex plate 905.

[0027] The working principle of this embodiment: When the injection molding machine injects metal powder, the injection end of the injection molding machine is communicated with one end of the first injection pipe 4. Subsequently, the metal powder will be injected into the second injection pipe 5 through the first injection pipe 4. At this time, the motor 901 is started. The motor 901 drives the first connecting column 902 to rotate. The first connecting column 902 drives the second connecting column 903 to rotate through the convex plate 905 and the groove 906. The second connecting column 903 drives the fixed seat 6 at the bottom to rotate. The fixed seat 6 drives the stirring spiral belt 7 fixed on the top to rotate. After the spiral stirring spiral belt 7 rotates, it can not only guide the metal powder to flow downward, prevent the metal powder from clogging in the second injection pipe 5, but also stir the flowing metal powder. Stirring the flowing metal powder can make it more evenly distributed in the second injection pipe 5 and the mold, reduce the voids and bubbles between the powder particles, thereby improving the fluidity of the powder. After improving the powder fluidity, it helps the metal powder to more smoothly enter the mold through the second injection pipe 5, reduce the gas entrapment caused by poor flow, and further prevent the phenomenon of air entrapment during the metal powder process, improving the quality of the metal finished product.

[0028] Embodiment Two

[0029] This embodiment is an improvement based on Embodiment One. Specifically, please refer to Figures 1 to 4 , a screw sleeve 10 is fixedly connected to the top of the inner wall of the connecting groove 904. A screw rod 11 is threadedly connected inside the screw sleeve 10. The screw rod 11 is rotatably connected to the second connecting column 903.

[0030] The bottom of the screw rod 11 extends to the bottom of the second connecting column 903 and is fixedly connected to a fixing block 12. The top of the fixing block 12 is rotatably connected to the bottom of the fixed seat 6.

[0031] An adjusting plate 13 is fixedly connected to the outer side of the fixing block 12. The number of the adjusting plates 13 is several, and several adjusting plates 13 are evenly distributed in a ring at equal intervals.

[0032] By setting the adjusting plate 13, the screw sleeve 10 and the screw rod 11, when the adjusting plate 13 is rotated, it will drive the screw rod 11 to rotate. After the screw rod 11 rotates, it will push the fixed seat 6 and the second connecting column 903 to move upward under the action of the screw sleeve 10, reducing the distance between the fixed seat 6 and the pressing plate 8. After the distance between the fixed seat 6 and the pressing plate 8 is reduced, the distance between the stirring spiral ribbons 7 can be compressed. When the adjusting plate 13 is rotated in the reverse direction, the stirring spiral ribbons 7 can be stretched, thereby increasing the distance between the stirring spiral ribbons 7. When the distance between the stirring spiral ribbons 7 increases, the channels inside the stirrer become wider, which is conducive to the smooth flow of materials such as metal powder. Reducing the distance between the stirring spiral ribbons 7 helps to form a stronger convection and shear effect, and can discharge gas or bubbles from the metal powder during the stirring process, improving the practicability of the stirring spiral ribbons 7.

[0033] The outer side of the pressing plate 8 is rotatably connected with a limiting ring 14, and the top of the limiting ring 14 is fixedly connected with the top of the inner wall of the second injection tube 5.

[0034] By setting the limiting ring 14, the limiting ring 14 can play a limiting role on the outer side of the pressing plate 8, making it not easy for the pressing plate 8 to shake and shift when rotating, and improving the stability of the pressing plate 8 when rotating.

[0035] 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.

[0036] The above is only the preferred embodiment 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 modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A device for solving the problem of trapped air in metal powder injection, comprising a lower mold (1), characterized in that: The top of the lower mold (1) is clamped with an upper mold (2). A connecting seat (3) is fixedly connected to the top of the upper mold (2). Both ends of the connecting seat (3) are communicated with a first injection pipe (4). A second injection pipe (5) is fixedly installed inside the upper mold (2). The first injection pipe (4) is communicated with the second injection pipe (5). A fixing seat (6) is arranged inside the second injection pipe (5). A stirring spiral ribbon (7) is fixedly connected to the top of the fixing seat (6). A pressing plate (8) is fixedly connected to the top of the stirring spiral ribbon (7). The top of the pressing plate (8) is rotatably connected to the top inner wall of the second injection pipe (5). A driving mechanism is embedded in the connecting seat (3), and the driving mechanism can drive the stirring spiral ribbon (7) to rotate.

2. The device for solving the air entrapment problem in metal powder injection according to claim 1, wherein: The driving mechanism includes a motor (901). The output end of the motor (901) is fixedly connected to a first connecting column (902). The pressing plate (8) is fixedly connected to the first connecting column (902). The bottom of the first connecting column (902) is slidably connected to a second connecting column (903).

3. The device for solving the gas entrapment problem in metal powder injection according to claim 2, characterized in that: The bottom of the second connecting column (903) is fixedly connected to the fixing seat (6). A connecting groove (904) is formed at the bottom of the first connecting column (902). The connecting groove (904) is in clearance fit with the second connecting column (903).

4. The device for solving the problem of trapped air in metal powder injection according to claim 3, wherein: A convex plate (905) is fixedly connected to the outside of the second connecting column (903). Grooves (906) are formed on both sides of the inner wall of the connecting groove (904). The grooves (906) are in clearance fit with the convex plate (905).

5. The device for solving the air entrapment problem in metal powder injection according to claim 3, wherein: A screw sleeve (10) is fixedly connected to the top of the inner wall of the connecting groove (904). A screw rod (11) is threadedly connected inside the screw sleeve (10).

6. The device for solving the problem of air entrapment in metal powder injection according to claim 5, wherein: The bottom of the screw rod (11) extends to the bottom of the second connecting column (903) and is fixedly connected to a fixing block (12). The top of the fixing block (12) is rotatably connected to the bottom of the fixing seat (6).

7. The device for solving the gas entrapment problem in metal powder injection according to claim 6, wherein: An adjusting plate (13) is fixedly connected to the outside of the fixing block (12). The number of the adjusting plates (13) is several, and several of the adjusting plates (13) are annularly and equidistantly distributed.

8. The device for solving the air entrapment problem in metal powder injection according to claim 1, characterized in that: A limiting ring (14) is rotatably connected to the outside of the pressing plate (8). The top of the limiting ring (14) is fixedly connected to the top inner wall of the second injection pipe (5).

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