Metal injection molding equipment

Abstract

The utility model relates to the technical field of metal powder processing, and discloses metal injection molding equipment which comprises a shell, storage barrels are arranged at the tops of the two sides of the shell, and a mixing mechanism, a heating mechanism and a discharging mechanism are arranged in the shell. The mixing mechanism comprises a mixing box, a discharging pipe I is arranged at the bottom of the mixing box, a central shaft is rotationally mounted in the mixing box, a plurality of transverse plates are fixedly connected to the upper part of the central shaft, a scraping plate is fixedly connected to the bottom of one end of each transverse plate, a rotating shaft is mounted in the middle, and a paddle I is mounted at the lower part of the rotating shaft; the heating mechanism comprises a heating box, a second discharging pipe is arranged at the bottom of the heating box, a heating pipe is arranged on the outer side of the heating box, and a second paddle and a spiral blade are installed in the heating box and the second discharging pipe of the center shaft respectively. The discharging mechanism comprises an air pump and a buffer box, and an injection pipe is installed at the bottom of the buffer box. According to the utility model, the mixing uniformity of the metal powder and the binder can be improved; meanwhile, metal powder can be prevented from remaining in the injection tube, and the situation that the injection tube is blocked is effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of metal powder processing, in particular to a metal injection molding device. Background Art

[0002] Metal powder injection molding technology is a product of the penetration and intersection of multiple disciplines such as plastic molding technology, polymer chemistry, powder metallurgy technology, and metal materials science. Using a mold, a blank can be injection molded and sintered to quickly manufacture high-density, high-precision, three-dimensional complex-shaped structural parts. It can quickly and accurately transform design ideas into products with certain structural and functional characteristics, and can directly mass-produce parts, which is a new revolution in the manufacturing technology industry. This process technology not only has the advantages of fewer processes, less or no cutting, and high economic benefits in the conventional powder metallurgy process, but also overcomes the disadvantages of uneven product quality, low mechanical properties, difficulty in forming thin walls and complex structures in the traditional powder metallurgy process. It is particularly suitable for mass-producing small, complex, and specially required metal parts.

[0003] In the production of existing metal injection molding devices, the binder and metal powder are usually added to the hopper of the injection machine in a certain proportion first, and then the raw materials are mixed and heated under the rotation of the screw rod to form a viscous state for injection. However, it is difficult to achieve uniform mixing of the binder and metal powder only through the screw rod, and metal powder is likely to remain in the injection pipe after injection. The viscous metal powder will cause blockage of the injection pipe after cooling, and improvement is urgently needed. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is that it is difficult to achieve uniform mixing of the binder and metal powder in the existing metal injection molding device, and metal powder is likely to remain in the injection pipe.

[0005] To solve the above problems, the technical solution of the utility model is: a metal injection molding device, including a housing, wherein storage barrels are symmetrically arranged at the top of both sides of the housing, and a mixing mechanism, a heating mechanism, and a discharging mechanism are arranged inside the housing;

[0006] The mixing mechanism includes a mixing box, a discharge pipe one is arranged at the bottom of the mixing box, a central shaft is rotatably installed inside, a motor for driving the central shaft to rotate is installed at the top, a plurality of cross plates are fixedly connected to the upper part of the central shaft, a scraper is fixedly connected to the bottom of the end of the cross plate far away from the central shaft through a vertical rod, and a rotating shaft is installed in the middle of the cross plate, and a paddle one is installed at the lower part of the rotating shaft;

[0007] The heating mechanism includes a heating box connected to the first discharge pipe. The bottom of the heating box is provided with a second discharge pipe, and the outside is provided with heating pipes. The central shaft passes through the heating box and extends into the interior of the second discharge pipe. A second paddle is installed on the central shaft inside the heating box, and a spiral blade is installed inside the second discharge pipe.

[0008] The discharging mechanism includes an air pump and a buffer box connected to the second discharge pipe. An injection pipe is installed at the bottom of the buffer box, and the output end of the air pump is connected to the buffer box through an air guide pipe.

[0009] Further, the housing includes a cylinder. The top of the cylinder is threadedly installed with a top cover, and the bottom is threadedly installed with a protective cap in a conical structure. The mixing mechanism and the heating mechanism are both installed inside the cylinder, and ventilation holes are provided on the top cover.

[0010] Further, a cover plate is movably provided at the top of the storage barrel, and a guide pipe is fixedly connected to the bottom. The guide pipe passes through the side wall of the cylinder and is connected to the mixing box.

[0011] Further, the rotating shaft passes through and is rotatably installed on the cross plate, and a gear is installed on the upper part of the rotating shaft. An external tooth ring meshing with the gear is fixedly installed on the inner top surface of the mixing box.

[0012] Further, a grinding seat is installed at the inner bottom of the mixing box. A grinding disc matching with the grinding seat is fixedly installed through and on the central shaft. A discharge hole with a diameter the same as the inner diameter of the first discharge pipe is provided at the center of the bottom of the grinding seat.

[0013] Further, the scraping plate is inclined, and the bottom surface of the scraping plate is attached to the top surface of the grinding seat.

[0014] Further, a solenoid valve is installed on the second discharge pipe, and the top of the spiral blade extends into the heating box.

[0015] Further, the inner diameter of the injection pipe is 1 / 4 to 1 / 2 of the inner diameter of the second discharge pipe.

[0016] Further, the air pump is installed on the top of the mixing box, and a one-way valve is provided at the connection between the air guide pipe and the buffer box.

[0017] Further, fillers are provided between the mixing box, the heating box and the inner wall of the cylinder.

[0018] The advantages of the present utility model compared with the existing technology are as follows: The motor of the present utility model drives the cross plate to rotate through the central axis, so that the scraping plate turns the metal powder and the binder, the paddle 1 stirs the metal powder and the binder, and the rotation of the paddle 2 makes the metal powder and the binder heat evenly and further improves the uniformity of the mixture of the metal powder and the binder; closing the solenoid valve and opening the air pump can increase the pressure in the buffer box, so that the metal powder flows out quickly and at the same time prevents the metal powder from remaining in the injection tube, effectively preventing the injection tube from being blocked. Brief Description of the Drawings

[0019] Figure 1 is a perspective view of the present utility model.

[0020] Figure 2 is a sectional view of the present utility model.

[0021] Figure 3 is a sectional view of the connection structure of the mixing box of the present utility model.

[0022] Figure 4 is a sectional view of the connection structure of the heating box of the present utility model.

[0023] Figure 5 is the present utility model Figure 4 sectional view of the structure at A in.

[0024] As shown in the figure: 1. Housing; 1.1 Cylinder; 1.2 Top cover; 1.3 Protective cap; 2. Storage bucket; 3. Cover plate; 4. Feeding pipe; 5. Mixing box; 6. Discharge pipe 1; 7. Central axis; 8. Motor; 9. Cross plate; 10. Vertical rod; 11. Scraping plate; 12. Rotating shaft; 13. Paddle 1; 14. Gear; 15. External tooth ring; 16. Grinding seat; 17. Grinding disc; 18. Heating box; 19. Discharge pipe 2; 20. Heating pipe; 21. Paddle 2; 22. Spiral blade; 23. Air pump; 24. Buffer box; 25. Injection pipe; 26. Air guide pipe. Detailed Embodiment

[0025] 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 in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.

[0026] Such as Figure 1As shown in the figure, a metal injection molding device includes a housing 1. On both sides of the top of the housing 1, there are symmetrically arranged material storage barrels 2, and inside the housing 1, there are a mixing mechanism, a heating mechanism, and a discharging mechanism. The housing 1 includes a cylinder 1.1. At the top of the cylinder 1.1, a top cover 1.2 is installed by threading, and at the bottom, a protective cap 1.3 with a conical structure is installed by threading. The mixing mechanism and the heating mechanism are both installed inside the cylinder 1.1. There are ventilation holes on the top cover 1.2. At the top of the material storage barrel 2, there is a movable cover plate 3, and at the bottom, there is a fixed guide pipe 4.

[0027] By providing two material storage barrels 2, it is convenient to store metal powder and binder separately. Valves can be installed on the guide pipe 4 to control the discharge of metal powder and binder.

[0028] As Figure 2 and Figure 3 shown in the figure, the mixing mechanism includes a mixing box 5. The guide pipe 4 passes through the side wall of the cylinder 1.1 and is connected to the mixing box 5. At the bottom of the mixing box 5, there is a first discharge pipe 6. Inside, a central shaft 7 is rotatably installed. At the top, there is a motor 8 for driving the central shaft 7 to rotate. At the upper part of the central shaft 7, there are a plurality of cross plates 9 fixedly connected. At the bottom of one end of the cross plate 9 away from the central shaft 7, there is a scraping plate 11 fixedly connected through a vertical rod 10. And in the middle of the cross plate 9, there is a rotating shaft 12 passing through and rotatably installed. At the lower part of the rotating shaft 12, there is a first paddle 13 installed, and at the upper part of the rotating shaft 12, there is a gear 14 installed. On the inner top surface of the mixing box 5, there is an external tooth ring 15 fixedly installed and meshing with the gear 14.

[0029] The metal powder and the binder are respectively added into the mixing box 5 through the guide pipe 4. The motor 8 drives the cross plate 9 to rotate forward through the central shaft 7. The cross plate 9 drives the scraping plate 11 to rotate through the vertical rod 10, which can turn over the metal powder and the binder. When the cross plate 9 rotates, it will synchronously drive the rotating shaft 12 to make a circular motion around the central shaft 7. The central shaft 7 drives the gear 14 to move along the external tooth ring 15, prompting the rotating shaft 12 to generate self-rotation. Furthermore, the rotating shaft 12 can drive the first paddle 13 to rotate, realizing the stirring of the metal powder and the binder and achieving the preliminary mixing of the metal powder and the binder.

[0030] At the inner bottom of the mixing box 5, there is a grinding seat 16. On the central shaft 7, there is a grinding disc 17 fixedly installed and matching with the grinding seat 16. At the center of the bottom of the grinding seat 16, there is a discharge hole with the same inner diameter as the first discharge pipe 6. The scraping plate 11 is inclined, and the bottom surface of the scraping plate 11 is in contact with the top surface of the grinding seat 16.

[0031] While the central shaft 7 rotates, it will drive the grinding disc 17 to rotate, thereby realizing the grinding of the metal powder and ensuring the fineness of the metal powder. Part of the metal powder and the binder will enter the gap between the grinding disc 17 and the grinding seat 16 before and during the stirring and start grinding. This part is small in quantity and will be continuously stirred later, so it will not have a great impact on the overall mixing.

[0032] As Figure 2 , Figure 4 and Figure 5 shown, the heating mechanism includes a heating box 18 connected to the first discharge pipe 6. The bottom of the heating box 18 is provided with a second discharge pipe 19, and the outside is provided with heating pipes 20. A solenoid valve is installed on the second discharge pipe 19. The central shaft 7 passes through the heating box 18 and extends into the interior of the second discharge pipe 19. A second paddle 21 is installed on the central shaft 7 inside the heating box 18, and a spiral blade 22 is installed inside the second discharge pipe 19. The top of the spiral blade 22 extends into the heating box 18.

[0033] The heating of the heating pipes 20 raises the temperature inside the heating box 18. The central shaft 7 drives the second paddle 21 to rotate, which can make the metal powder and the binder evenly heated, and at the same time further improve the uniformity of the mixing of the metal powder and the binder. When the motor 8 rotates forward, the central shaft 7 drives the spiral blade 22 to rotate forward, and the material inside the second discharge pipe 19 can be conveyed upward into the heating box 18.

[0034] The discharging mechanism includes an air pump 23 and a buffer box 24 connected to the second discharge pipe 19. The air pump 23 is installed on the top of the mixing box 5. The bottom of the buffer box 24 is installed with an injection pipe 25. The inner diameter of the injection pipe 25 is 1 / 3 of the inner diameter of the second discharge pipe 19. The output end of the air pump 23 is connected to the buffer box 24 through a gas pipe 26.

[0035] When the heating is completed, the solenoid valve on the second discharge pipe 19 is opened, and the motor 8 drives the central shaft 7 to rotate in the reverse direction. Under the action of the spiral blade 22, the metal powder is conveyed into the buffer box 24 and then discharged through the injection pipe 25. When there is no metal powder in the heating box 18, the solenoid valve is closed, and the air pump 23 is turned on. The airflow generated by the operation of the air pump 23 is conveyed into the buffer box 24 through the gas pipe 26, which can make the metal powder flow out quickly.

[0036] In specific use, connect this device to an external power supply and a controller. Store metal powder and binder separately through two storage bins 2. The metal powder and the binder are respectively added into the mixing box 5 through two feeding pipes 4. The motor 8 drives the central shaft 7 and the cross plate 9 to rotate, so that the scraper 11 flips the metal powder and the binder, and the rotating shaft 12 drives the first paddle 13 to rotate to stir the metal powder and the binder, thereby improving the mixing effect of the metal powder and the binder. The central shaft 7 drives the grinding disc 17 to rotate to grind the metal powder and ensure the fineness of the metal powder. When the heating pipe 20 works for heating, the central shaft 7 drives the second paddle 21 to rotate, which can make the metal powder and the binder heat evenly, and at the same time further improve the uniformity of the mixture of the metal powder and the binder. Open the solenoid valve on the second discharge pipe 19, and the motor 8 drives the central shaft 7 to rotate in the reverse direction, then the metal powder can be transported into the buffer box 24 and then discharged into the mold through the injection pipe 25. Close the solenoid valve and turn on the air pump 23, which can increase the pressure in the buffer box 24, make the metal powder flow out quickly, and at the same time avoid the metal powder remaining in the injection pipe 25 to ensure the smoothness of the injection pipe 25.

[0037] The parts not disclosed in this utility model are all prior arts, and their specific structures and working principles will not be elaborated herein.

[0038] 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 sequence 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 further includes elements inherent to such process, method, article or device.

[0039] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

[0040] The above describes the present utility model and its embodiments. This description is not restrictive. What is shown in the drawings is only one of the embodiments of the present utility model, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and design similar structural modes and embodiments without creative efforts without departing from the creative purpose of the present utility model, they should all fall within the protection scope of the present utility model.

Claims

1. A metal injection molding device, comprising a housing (1), wherein material storage barrels (2) are symmetrically arranged at the top of both sides of the housing (1), and a mixing mechanism, a heating mechanism and a discharging mechanism are arranged inside the housing (1), characterized in that: The mixing mechanism comprises a mixing box (5), a discharging pipe (6) is provided at the bottom of the mixing box (5), a central shaft (7) is rotatably installed inside, a motor (8) is installed on the top for driving the central shaft (7) to rotate, a plurality of transverse plates (9) are fixedly connected to the upper part of the central shaft (7), a scraper (11) is fixedly connected to the bottom of the transverse plate (9) away from the central shaft (7) through a vertical rod (10), a rotating shaft (12) is installed in the middle of the transverse plate (9), and a paddle (13) is installed at the lower part of the rotating shaft (12); The heating mechanism comprises a heating box (18) connected to the first discharge pipe (6), the bottom of the heating box (18) is provided with a second discharge pipe (19), and the outer side is provided with a heating pipe (20), the central axis (7) passes through the heating box (18) and extends to the inside of the second discharge pipe (19), and the central axis (7) is installed with a second paddle (21) inside the heating box (18), and a spiral blade (22) is installed inside the second discharge pipe (19); The discharge mechanism comprises an air pump (23) and a buffer box (24) connected to the second discharge pipe (19), an injection tube (25) is installed at the bottom of the buffer box (24), and the output end of the air pump (23) is connected to the buffer box (24) through an air guide tube (26).

2. A metal injection molding device according to claim 1, characterized in that: The shell (1) comprises a cylinder (1.1), a top cover (1.2) is threadedly mounted on the top of the cylinder (1.1), and a protective cap (1.3) with a conical structure is threadedly mounted on the bottom. The mixing mechanism and the heating mechanism are both mounted inside the cylinder (1.1), and a ventilation hole is provided on the top cover (1.2).

3. A metal injection molding device according to claim 2, characterized in that: The top of the material storage barrel (2) is movably provided with a cover plate (3), and the bottom is fixedly connected with a material guide pipe (4), and the material guide pipe (4) passes through the side wall of the cylinder (1.1) and is connected to the mixing box (5).

4. A metal injection molding device according to claim 1, characterized in that: The rotating shaft (12) penetrates and is rotatably mounted on the transverse plate (9), and a gear (14) is mounted on the upper portion of the rotating shaft (12). An outer gear ring (15) meshing with the gear (14) is fixedly mounted on the inner top surface of the mixing box (5).

5. The metal injection molding equipment according to claim 1, characterized in that: A grinding seat (16) is installed at the bottom of the mixing box (5), and a grinding disc (17) matching the grinding seat (16) is passed through and fixedly installed on the central axis (7). A discharge hole with a diameter the same as the inner diameter of the discharge pipe (6) is provided at the center of the bottom of the grinding seat (16).

6. A metal injection molding device according to claim 5, characterized in that: The scraper (11) is arranged at an angle, and the bottom surface of the scraper (11) is in contact with the top surface of the grinding seat (16).

7. The metal injection molding equipment according to claim 1, characterized in that: The second discharge pipe (19) is provided with a solenoid valve, and the top of the spiral blade (22) extends to the interior of the heating box (18).

8. The metal injection molding equipment according to claim 1, characterized in that: The inner diameter of the injection tube (25) is 1 / 4 to 1 / 2 of the inner diameter of the second discharge tube (19).

9. The metal injection molding equipment according to claim 1, characterized in that: The air pump (23) is installed on the top of the mixing box (5).

Images