Molding die for metal powder injection molding

Abstract

The utility model discloses a forming die for metal powder injection forming, which belongs to the technical field of metal powder manufacturing and comprises a worktable, a support frame fixedly connected to the top of the worktable, a lower die fixedly connected to the outer side wall of the support frame, a water tank fixedly connected to the top of the worktable, and a positioning frame fixedly connected to the inner side wall of the water tank. A heating rod is arranged on the inner side wall of the workbench, and the outer side wall of the heating rod is matched with the inner side wall of the positioning frame. According to the forming mold for metal powder injection forming, through cooperative use of the water tank, the positioning frame, the heating rod, the gas conveying pipe, the limiting frame and the flow channel, a water source in the water tank is conveniently heated, after water vapor is generated, the lower mold is preheated, and therefore the situation that in the using process, the lower mold suddenly bears heat of injection raw materials and is deformed is avoided; the water vapor continuously flows through the lower die, so that the flowability of raw materials in the lower die can be improved, the shape of a product is prevented from being changed, and the defect rate of the product is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of metal powder manufacturing, and more specifically, relates to a forming die for metal powder injection molding. Background Art

[0002] Metal powder injection molding is an advanced manufacturing technology that mixes metal powder with a binder and then manufactures complex-shaped metal parts through an injection molding process. The raw materials are injected into the die cavity under high temperature and pressure, and after cooling and solidifying, a formed blank is obtained. Subsequently, through subsequent processes such as debinding and sintering, the binder is removed and the metal powder particles are tightly combined, and finally, metal parts with high strength and high precision are obtained;

[0003] However, due to the relatively low temperature of the die, the raw materials will rapidly cool when injected into the cavity, resulting in an increase in viscosity and flow resistance, making it difficult to uniformly fill the die cavity, and easily causing defects such as part material shortage and uneven density. Secondly, the die may deform when suddenly heated. This non-uniform thermal expansion will damage the dimensional accuracy and surface quality of the die, affect the shape and dimensional accuracy of the product, and in severe cases, may even cause die damage, shorten the service life of the die, and increase production costs;

[0004] To solve the above problems, a forming die for metal powder injection molding is proposed in this application. Summary of the Utility Model

[0005] In view of the problems in the related art, the present utility model provides a forming die for metal powder injection molding to overcome the above technical problems existing in the prior related art.

[0006] To achieve the above object, the present utility model adopts the following technical solutions:

[0007] A forming die for metal powder injection molding includes a workbench. A support frame is fixedly connected to the top of the workbench. A lower die is fixedly connected to the outer sidewall of the support frame. A water tank is fixedly connected to the top of the workbench. A positioning frame is fixedly connected to the inner sidewall of the water tank. A heating rod is arranged on the inner sidewall of the workbench, and the outer sidewall of the heating rod fits with the inner sidewall of the positioning frame. An air delivery pipe is fixedly communicated with the top of the water tank, and the outer sidewall of the air delivery pipe fits with the inner sidewall of the limit frame. A runner is formed on the inner sidewall of the lower die.

[0008] Preferably, a fixing frame is fixedly connected to the top of the water tank. A feeding pipe is fixedly connected to the inner side wall of the fixing frame. An air outlet pipe is fixedly communicated with the outer side wall of the lower die. One end of the air outlet pipe far away from the lower die is fixedly communicated with a heat preservation pipe. The outer side wall of the heat preservation pipe is attached to the outer side wall of the feeding pipe. By providing the air outlet pipe and the heat preservation pipe, it is convenient to keep the raw materials inside the feeding pipe warm and avoid the raw materials from cooling during transportation.

[0009] Preferably, a motor is fixedly connected to the top of the water tank. A auger is fixedly connected to the output end of the motor. By providing the motor and the auger, it is convenient to transport the raw materials inside the feeding pipe.

[0010] Preferably, a heat dissipation pipe is fixedly connected to the top of the workbench. Heat dissipation fins are fixedly connected to the outer side wall of the heat dissipation pipe. One end of the heat preservation pipe far away from the air outlet pipe is fixedly communicated with one end of the heat dissipation pipe. One end of the heat dissipation pipe far away from the heat preservation pipe is fixedly communicated with a return pipe. One end of the return pipe far away from the heat dissipation pipe is fixedly connected to the outer side wall of the water tank. By the combined use of the heat preservation pipe, the heat dissipation pipe, the heat dissipation fins and the return pipe, it is convenient to cool the water vapor inside the heat preservation pipe, so that the water vapor is restored to water droplets and returns to the inside of the water tank along the return pipe.

[0011] Preferably, a feeding hopper is fixedly communicated with the outer side wall of the feeding pipe. A water injection port is fixedly communicated with the top of the water tank. By providing the water injection port, it is convenient to supplement the water source inside the water tank and avoid the water source inside the water tank from drying up.

[0012] Preferably, an upper die is slidably connected to the outer side wall of the support frame. A cylinder is fixedly connected to the inner side wall of the support frame. The output end of the cylinder is fixedly connected to the outer side wall of the upper die. By providing the upper die and the cylinder, it is convenient to process and press the metal powder.

[0013] In summary, the technical effects and advantages of the present utility model: For the forming die for metal powder injection molding, through the combined use of the water tank, the positioning frame, the heating rod, the air delivery pipe, the limiting frame and the runner, it is convenient to heat the water source inside the water tank. After generating water vapor, the lower die is preheated, thereby avoiding the lower die from deforming suddenly due to the heat brought by the injection raw materials during use. Moreover, the continuous water vapor flowing through the lower die can improve the fluidity of the raw materials inside the lower die, thereby avoiding the change of the product shape and reducing the defective rate of the product.

[0014] Through the combined use of the air outlet pipe, the heat preservation pipe, the heat dissipation pipe, the heat dissipation fins and the return pipe, it is convenient to recycle the used water vapor and make part of the water vapor liquefy and return to the inside of the water tank, improving the utilization rate of the water source. Description of the Drawings

[0015] Figure 1Schematic diagram of the overall structure of the present utility model;

[0016] Figure 2 Schematic diagram of the positioning frame and related parts of the present utility model;

[0017] Figure 3 Schematic diagram of the heat preservation pipe and related parts of the present utility model;

[0018] Figure 4 Schematic diagram of the heat dissipation pipe and related parts of the present utility model.

[0019] In the figure:

[0020] 1. Workbench; 2. Support frame; 3. Lower die; 4. Water tank; 5. Positioning frame; 6. Heating rod; 7. Air delivery pipe; 8. Limiting frame; 9. Runner; 10. Fixed frame; 11. Air outlet pipe; 12. Heat preservation pipe; 13. Feeding hopper; 14. Feeding pipe; 15. Motor; 16. Screw conveyor; 17. Heat dissipation pipe; 18. Heat dissipation fin; 19. Return pipe; 20. Water injection port; 21. Upper die; 22. Cylinder. Specific implementation mode

[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 of the embodiments.

[0022] Refer to Figure 1 and Figure 2 , a forming die for metal powder injection molding, including a workbench 1, a support frame 2 is fixedly connected to the top of the workbench 1, a lower die 3 is fixedly connected to the outer side wall of the support frame 2, a water tank 4 is fixedly connected to the top of the workbench 1, the water tank 4 is located on the side of the support frame 2 away from the lower die 3, a positioning frame 5 is fixedly connected to the inner side wall of the water tank 4, there are multiple positioning frames 5, and the multiple positioning frames 5 are respectively located on both sides inside the water tank 4. A heating rod 6 is arranged on the inner side wall of the workbench 1, the heating rod 6 is connected to an external power supply, and the outer side wall of the heating rod 6 fits with the inner side walls of the multiple positioning frames 5. The multiple positioning frames 5 limit the position of the heating rod 6 to prevent the position of the heating rod 6 from changing during use. An air delivery pipe 7 is fixedly communicated with the top of the water tank 4. The air delivery pipe 7 is a fluororubber hose, and the fluororubber hose has excellent high temperature resistance and chemical corrosion resistance and is suitable for the transmission of high temperature steam. A limiting frame 8 is fixedly connected to the top of the support frame 2, and the outer side wall of the air delivery pipe 7 fits with the inner side wall of the limiting frame 8. The air delivery pipe 7 is located inside the limiting frame 8. A runner 9 is opened on the inner side wall of the lower die 3, and the air delivery pipe 7 is fixedly communicated with the lower die 3 through the runner 9, and the runner 9 penetrates through the top and bottom of the lower die 3;

[0023] During use, the heating rod 6 is started, and the water inside the water tank 4 is heated by the heating rod 6. When the water is heated to boiling, the water will evaporate into water vapor. Under the action of the pressure difference between the inside and outside of the water tank 4, the water vapor inside the water tank 4 is transmitted along the air delivery pipe 7 at the top of the water tank 4. When the water vapor enters the flow channel 9 along the air delivery pipe 7, since the material of the lower mold 3 is metal, when the water vapor flows through the inside of the lower mold 3 through the flow channel 9, the water vapor will preheat the lower mold 3, thereby preventing the lower mold 3 from deforming suddenly when injecting and improving the fluidity of the raw material.

[0024] Refer to Figure 2 and Figure 3 , a fixing frame 10 is fixedly connected to the top of the water tank 4. A material delivery pipe 14 is fixedly connected to the inner side wall of the fixing frame 10. The material delivery pipe 14 is used to transport the injection raw material. An air outlet pipe 11 is fixedly communicated with the outer side wall of the lower mold 3. The outer side wall of the air outlet pipe 11 penetrates through the support frame 2 and extends to the side of the support frame 2 away from the lower mold 3. One end of the air outlet pipe 11 away from the lower mold 3 is fixedly communicated with a heat preservation pipe 12. The outer side wall of the heat preservation pipe 12 is attached to the outer side wall of the material delivery pipe 14. The heat preservation pipe 12 is spiral. The heat preservation pipe 12 is a stainless steel corrugated pipe. The stainless steel corrugated pipe has good high temperature resistance, corrosion resistance and compressive performance, can withstand high temperature water vapor, and has a long service life. It can effectively extend the residence time of the water vapor inside the heat preservation pipe 12, thereby conducting heat through the stainless steel corrugated pipe, and then facilitating the heat preservation of the raw material transported inside the material delivery pipe 14 and preventing the raw material from condensing during the transportation process.

[0025] Refer to Figure 2 and Figure 3 , a motor 15 is fixedly connected to the top of the water tank 4. The motor 15 is connected to an external power supply. The output end of the motor 15 is fixedly connected to a auger 16. The auger 16 is located inside the material delivery pipe 14. During use, the motor 15 is started, and the auger 16 is driven by the motor 15 to rotate. When the auger 16 rotates, it will push the raw material inside the material delivery pipe 14 to move and apply pressure to the raw material, so that the raw material enters the inside of the lower mold 3 along the discharge pipe of the material delivery pipe 14.

[0026] Refer to Figure 3 and Figure 4, a heat dissipation pipe 17 is fixedly connected to the top of the workbench 1. The heat dissipation pipe 17 is set at an inclined angle, and the horizontal height of the end of the heat dissipation pipe 17 close to the support frame 2 is higher, which is convenient for guiding the water droplets inside the heat dissipation pipe 17. A heat dissipation fin 18 is fixedly connected to the outer side wall of the heat dissipation pipe 17. There are multiple heat dissipation fins 18, and the multiple heat dissipation fins 18 are distributed in a linear array on the outer side wall of the heat dissipation pipe 17, and all the multiple heat dissipation fins 18 are made of metal material, which is convenient for dissipating the heat of the water vapor inside the heat dissipation pipe 17. One end of the heat preservation pipe 12 far away from the air outlet pipe 11 is fixedly communicated with one end of the heat dissipation pipe 17. One end of the heat dissipation pipe 17 far away from the heat preservation pipe 12 is fixedly communicated with a return pipe 19, which is convenient for guiding the water inside the heat dissipation pipe 17. One end of the return pipe 19 far away from the heat dissipation pipe 17 is fixedly communicated with the outer side wall of the water tank 4. During use, the water vapor enters the inside of the heat dissipation pipe 17 after passing through the heat preservation pipe 12. When the water vapor flows through the heat dissipation pipe 17 and contacts the heat dissipation fin 18, the heat of the water vapor is exchanged with the outside through the heat dissipation fin 18, thereby reducing the temperature of the water vapor, and then the water vapor is restored to water droplets. Also, because the heat dissipation pipe 17 is set at an inclined angle, when the water droplets are formed, they will flow back to the inside of the water tank 4 along the heat dissipation pipe 17 through the return pipe 19, which is convenient for recycling the water source and improving the utilization rate of the water source.

[0027] Refer to Figure 3 , a feed hopper 13 is fixedly communicated with the outer side wall of the material conveying pipe 14. The feed hopper 13 is located above the material conveying pipe 14, and the cross-section of the feed hopper 13 is in an inverted conical shape. A water injection port 20 is fixedly communicated with the top of the water tank 4. The water injection port 20 is in a sealed state. When the operator adds water to the water tank 4, the heating rod 6 is turned off. After the temperature inside the water tank 4 drops, the water injection port 20 is opened to supplement the water source for the water tank 4.

[0028] Refer to Figure 1 , an upper mold 21 is slidably connected to the outer side wall of the support frame 2. An air cylinder 22 is fixedly connected to the inner side wall of the support frame 2. The air cylinder 22 is connected to an external power supply. The output end of the air cylinder 22 is fixedly connected to the outer side wall of the upper mold 21, and the output end of the air cylinder 22 is located at the center of the outer side wall of the upper mold 21.

[0029] Working principle: When in use, start the heating rod 6. The heating rod 6 heats the water inside the water tank 4. When the water is heated to boiling, the water will evaporate into water vapor. Under the action of the pressure difference between the inside and outside of the water tank 4, the water vapor inside the water tank 4 is transmitted along the gas transmission pipe 7 at the top of the water tank 4. When the water vapor enters the flow channel 9 along the gas transmission pipe 7, since the material of the lower mold 3 is metal, when the water vapor flows through the inside of the lower mold 3 through the flow channel 9, the water vapor will preheat the lower mold 3, thus avoiding the sudden deformation of the lower mold 3 due to heat during injection and improving the fluidity of the raw material. When the water vapor is transmitted through the flow channel 9 to the air outlet pipe 11 and the heat preservation pipe 12, since the heat preservation pipe 12 is arranged in a spiral shape, it can effectively extend the residence time of the water vapor inside the heat preservation pipe 12, thereby conducting heat through the stainless steel corrugated pipe, and further facilitating the heat preservation of the raw material transmitted inside the material conveying pipe 14 to avoid the condensation of the raw material during transmission. Further, the water vapor enters the inside of the heat dissipation pipe 17 after passing through the heat preservation pipe 12. When the water vapor flows through the heat dissipation pipe 17, when the water vapor contacts the heat dissipation fins 18, the heat of the water vapor is exchanged with the outside through the heat dissipation fins 18, thereby reducing the temperature of the water vapor, and further causing the water vapor to be reduced to water droplets. Also, because the heat dissipation pipe 17 is set at an inclined angle, when the water droplets are formed, they will flow back to the inside of the water tank 4 along the heat dissipation pipe 17 through the return pipe 19, facilitating the recovery of the water source and improving the utilization rate of the water source.

[0030] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A molding die for metal powder injection molding, comprising a workbench (1), characterized in that, A support frame (2) is fixedly connected to the top of the workbench (1). A lower mold (3) is fixedly connected to the outer side wall of the support frame (2). A water tank (4) is fixedly connected to the top of the workbench (1). A positioning frame (5) is fixedly connected to the inner side wall of the water tank (4). A heating rod (6) is arranged on the inner side wall of the workbench (1). The outer side wall of the heating rod (6) fits with the inner side wall of the positioning frame (5). An air delivery pipe (7) is fixedly communicated with the top of the water tank (4). A limiting frame (8) is fixedly connected to the top of the support frame (2). The outer side wall of the air delivery pipe (7) fits with the inner side wall of the limiting frame (8). A flow channel (9) is formed in the inner side wall of the lower mold (3).

2. The molding die for metal powder injection molding according to claim 1, characterized in that, A fixing frame (10) is fixedly connected to the top of the water tank (4). A material delivery pipe (14) is fixedly connected to the inner side wall of the fixing frame (10). An air outlet pipe (11) is fixedly communicated with the outer side wall of the lower mold (3). One end of the air outlet pipe (11) far away from the lower mold (3) is fixedly communicated with a heat preservation pipe (12). The outer side wall of the heat preservation pipe (12) is attached to the outer side wall of the material delivery pipe (14).

3. The molding die for metal powder injection molding according to claim 1, characterized in that, A motor (15) is fixedly connected to the top of the water tank (4). A auger (16) is fixedly connected to the output end of the motor (15).

4. The molding die for metal powder injection molding according to claim 2, characterized in that, A heat dissipation pipe (17) is fixedly connected to the top of the workbench (1). Heat dissipation fins (18) are fixedly connected to the outer side wall of the heat dissipation pipe (17). One end of the heat preservation pipe (12) far away from the air outlet pipe (11) is fixedly communicated with one end of the heat dissipation pipe (17). One end of the heat dissipation pipe (17) far away from the heat preservation pipe (12) is fixedly communicated with a return pipe (19). One end of the return pipe (19) far away from the heat dissipation pipe (17) is fixedly connected to the outer side wall of the water tank (4).

5. The injection molding die for metal powder injection molding according to claim 2, wherein A feed hopper (13) is fixedly communicated with the outer side wall of the material delivery pipe (14). A water injection port (20) is fixedly communicated with the top of the water tank (4).

6. The molding die for metal powder injection molding according to claim 1, characterized in that, An upper mold (21) is slidably connected to the outer side wall of the support frame (2). A cylinder (22) is fixedly connected to the inner side wall of the support frame (2). The output end of the cylinder (22) is fixedly connected to the outer side wall of the upper mold (21).

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