Mould for preventing metal liquid from overflowing

Abstract

The utility model relates to the technical field of moulds, in particular to a mould for preventing metal liquid from overflowing, an overflow part comprises an outer cavity, an inner cavity, a plurality of first overflow ports and a plurality of second overflow ports, the inner cavity is arranged in the outer cavity, the first overflow ports are all arranged on the upper portion of the inner cavity to communicate the inner cavity with the outer cavity, the second overflow ports are all arranged at the bottom of the outer cavity, and the first overflow ports are communicated with the second overflow ports. The outer cavity is communicated with the shunting part; the sectional area of the second overflow port is smaller than that of the secondary flow channel, the second overflow port inclines downwards, and a part of molten metal overcomes the gravity of the second overflow port to enter the outer cavity from the second overflow port, fills the outer cavity and then flows into the inner cavity through the first overflow port, and due to the fact that the first overflow port inclines downwards, the molten metal needs to overcome the gravity to flow into the inner cavity from the first overflow port. Therefore, the molten metal is effectively prevented from overflowing from the sprue gate, the heating wire is heated, the molten metal in the outer cavity is heated, heat loss of the molten metal is compensated, and the molten metal is prevented from being solidified and cannot flow.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a mold for preventing molten metal from overflowing. Background Art

[0002] Metal injection molding (MIM) is a process that leverages the vast capabilities of injection molding to create structural metal parts. Unlike thermoplastic molding, where molded parts are typically the final product, MIM parts must subsequently undergo heat treatment to remove the polymer and sinter to create a dense structural component. Both thermoplastic and MIM processes utilize temperature and pressure to form components, resulting in similarities in the science of shape formation. MIM offers numerous advantages, including the ability to produce complex geometries. Any product that can be formed using an injection mold can also be produced using MIM, offering a high degree of geometric design freedom. MIM is also suitable for high-volume production, with a typical production cycle of 5-7 days, enabling continuous supply after each cycle. Daily production can range from a few hundred to hundreds of thousands, depending on demand. The high density of MIM products offers excellent material properties, approaching those of sheet metal, making them particularly suitable for parts with specific performance requirements.

[0003] During the casting of a metal injection molding mold, molten metal solution is injected into the pouring port, and then flows into the mold from the pouring port to form. Most existing pouring ports are straight cylindrical and have no buffer space. The molten metal is directly pressed into the mold through the pouring port. If the pressure on the molten metal is too great, it is easy to overflow from the pouring port. Utility Model Content

[0004] The main purpose of the utility model is to provide a mold to prevent molten metal from overflowing, so as to solve the problem in the related art that the pouring mouth has no buffer space and the molten metal is prone to overflow from the pouring mouth when the pressure it bears is too high.

[0005] To achieve the above object, according to one aspect of the present invention, a mold for preventing molten metal from overflowing is provided, comprising: a fixed mold portion, the fixed mold portion being located below the mold and providing half of the mold;

[0006] A movable mold portion, the movable mold portion being connected to the top of the fixed mold portion by bolts, the movable mold portion providing half of the model, and when the movable mold portion and the fixed mold portion are combined, a complete model can be provided;

[0007] The injection part is arranged at the top of the movable mold part, and the injection material is added to the mold through the injection part. The injection part includes a support component and a pouring part. The pouring part is arranged inside the support component. The pouring part includes an overflow part and a diversion part. The overflow part includes an outer cavity, an inner cavity, a plurality of first overflow ports and a plurality of second overflow ports. The inner cavity is arranged in the outer cavity. The first overflow ports are all arranged at the upper part of the inner cavity to connect the inner cavity with the outer cavity. The second overflow ports are all arranged at the bottom of the outer cavity to connect the outer cavity with the diversion part. If the pressure of the molten metal in the diversion part is too large, the molten metal flows into the outer cavity through the second overflow port, fills the outer cavity, and then flows into the inner cavity through the first overflow port.

[0008] Furthermore, the fixed mold part includes a base plate, a counterweight block and a fixed mold body, the counterweight block is fixed on the base plate, the fixed mold body is fixed on the counterweight block, and the fixed mold body provides half of the model.

[0009] Furthermore, the movable mold part includes a pressure top, a pressure plate and a movable mold body, the pressure plate is fixedly arranged at the bottom of the pressure top, the movable mold body is fixedly arranged at the bottom of the pressure plate, and the movable mold body provides half of the model.

[0010] Furthermore, the support assembly includes an injection ring, an insulation tube and several connecting rods. The injection ring is fixed to the top of the pressure top, the insulation tube is fixed to the outer ring of the pouring part, and one end of the connecting rod is fixedly connected to the diversion part, and the other end is fixedly connected to the insulation tube.

[0011] Furthermore, the pouring part also includes a pouring gate and a main channel, the pouring gate is arranged in the middle of the injection ring, and the main channel is fixedly arranged at the lower end of the pouring gate.

[0012] Furthermore, the overflow part also includes a cut-off body and a heating wire. The cut-off body is fixedly arranged at the upper part of the inner cavity, dividing the inner cavity into two unconnected upper and lower parts. The cut-off body is conical, and the tip of the cone is located below the main channel, blocking the molten metal flowing out of the main channel from entering the lower part of the inner cavity. The cut-off body is located below the first overflow port.

[0013] Furthermore, the heating wire is located at the lower part of the inner cavity and below the shut-off body. The heating wire is connected to an external power supply. When the power is turned on, the heating wire starts to heat up.

[0014] Furthermore, the diversion portion includes a secondary flow channel, a branch flow channel and a pouring hole assembly, and the pouring hole assembly includes a plurality of gates and a plurality of pouring holes.

[0015] Furthermore, the secondary flow channel is fixedly arranged at the bottom end of the overflow portion, one end of the second overflow port is communicated with the secondary flow channel, and the other end is communicated with the external cavity, and the branch flow channel is transversely arranged at the bottom of the secondary flow channel.

[0016] Furthermore, the gates are all fixedly arranged on the bottom surface of the branch channel, and the pouring holes are all arranged at the bottom of the corresponding gates.

[0017] Compared with the prior art, the utility model has the following beneficial effects: when the pressure of the molten metal in the secondary flow channel is too high, it causes it to flow upward. When it flows to the second overflow port, since the cross-sectional area of ​​the second overflow port is smaller than the cross-sectional area of ​​the secondary flow channel and it is inclined downward, a part of the molten metal overcomes its own gravity and enters the outer cavity from the second overflow port, fills the outer cavity, and then flows into the inner cavity through the first overflow port. Since the first overflow port is inclined downward, the molten metal needs to overcome its own weight to flow from the first overflow port into the inner cavity, consuming part of its pressure, thereby effectively preventing the molten metal from overflowing from the pouring port. The heating wire heats up to heat the molten metal in the outer cavity, compensates for its heat loss, and prevents the molten metal from solidifying and being unable to flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall schematic diagram of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the utility model;

[0020] Figure 3 This is an overall schematic diagram of the injection part of the utility model;

[0021] Figure 4 This is a schematic diagram of the injection unit structure of the utility model;

[0022] Figure 5 This is a schematic diagram of the pouring part structure of the utility model.

[0023] Illustration:

[0024] 1. Moving mold part; 11. Pressing top; 12. Pressure plate; 13. Moving mold body;

[0025] 2. Fixed mold; 21. Bottom plate; 22. Counterweight; 23. Fixed mold body;

[0026] 3. Injection part; 31. Injection ring; 32. Pouring part; 33. Insulation tube; 34. Connecting rod; 321. Pouring gate; 322. Main channel; 323. Overflow part; 324. Diversion part; 3231. Outer cavity; 3232. Inner cavity; 3233. First overflow outlet; 3234. Shut-off body; 3235. Heating wire; 3236. Second overflow outlet; 3241. Secondary channel; 3242. Branch channel; 3243. Gate; 3244. Pouring hole. DETAILED DESCRIPTION

[0027] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the following is a detailed description of the specific implementation method, structure, characteristics and effects of the present invention in combination with the accompanying drawings and preferred embodiments.

[0028] See also Figures 1 to 5 , this embodiment provides a mold to prevent molten metal from overflowing, including: a fixed mold part 2, the fixed mold part 2 is located below the mold, and the fixed mold part 2 provides half of the model;

[0029] The movable mold part 1 is connected to the top of the fixed mold part 2 by bolts. The movable mold part 1 provides half of the model. When the movable mold part 1 and the fixed mold part 2 are combined, a complete model can be provided;

[0030] The injection unit 3 is located at the top of the movable mold part 1 and is used to add the injection material into the mold. The injection unit 3 includes a support assembly and a pouring unit 32. The pouring unit 32 is located inside the support assembly.

[0031] The pouring portion 32 includes an overflow portion 323 and a diversion portion 324. The overflow portion 323 includes an outer cavity 3231, an inner cavity 3232, a plurality of first overflow ports 3233, and a plurality of second overflow ports 3236. The inner cavity 3232 is disposed within the outer cavity 3231. The first overflow ports 3233 are all disposed at the upper portion of the inner cavity 3232 to connect the inner cavity 3232 with the outer cavity 3231. The second overflow ports 3236 are all disposed at the bottom of the outer cavity 3231 to connect the outer cavity 3231 with the diversion portion 324. If the pressure of the molten metal in the diversion portion 324 is too high, the molten metal flows into the outer cavity 3231 through the second overflow ports 3236, fills the outer cavity 3231, and then flows into the inner cavity 3232 through the first overflow ports 3233.

[0032] The fixed mold part 2 includes a base plate 21, a counterweight block 22 and a fixed mold body 23. The counterweight block 22 is fixed on the base plate 21 to lower the center of gravity of the mold and improve its stability. The fixed mold body 23 is fixed on the counterweight block 22 and provides half of the model.

[0033] The movable mold part 1 includes a pressure top 11, a pressure plate 12 and a movable mold body 13. The pressure plate 12 is fixed at the bottom of the pressure top 11 to increase the weight of the pressure top 11 and press the movable mold body 13 toward the fixed mold body 23. The movable mold body 13 is fixed at the bottom of the pressure plate 12 and provides half of the model.

[0034] The support assembly includes an injection ring 31, an insulation tube 33 and several connecting rods 34. The injection ring 31 is fixed on the top of the pressure top 11, and the insulation tube 33 is fixed on the outer ring of the pouring part 32 to slow down the loss of heat of the molten metal in the pouring part 32. One end of the connecting rod 34 is fixedly connected to the diversion part 324, and the other end is fixedly connected to the insulation tube 33 to increase the stability of the diversion part 324 and prevent displacement during the pouring process.

[0035] The pouring part 32 also includes a pouring gate 321 and a main channel 322 . The pouring gate 321 is located in the middle of the injection ring 31 , and the main channel 322 is fixedly located at the lower end of the pouring gate 321 . The molten metal is added from the pouring gate 321 and flows downward along the main channel 322 .

[0036] The overflow portion 323 also includes a shut-off body 3234 and a heating wire 3235. The shut-off body 3234 is fixedly arranged at the upper part of the inner cavity 3232, dividing the inner cavity 3232 into two unconnected upper and lower parts. The shut-off body 3234 is conical, and the tip of the cone is located below the main channel 322, blocking the molten metal flowing out of the main channel 322 from entering the lower part of the inner cavity 3232. The shut-off body 3234 is located below the first overflow port 3233. After the molten metal flows down the main channel 322, it is blocked by the shut-off body 3234 and enters the first overflow port 3233.

[0037] The heating wire 3235 is located at the lower part of the inner cavity 3232 and below the shut-off body 3234. The heating wire 3235 is connected to an external power supply. When the power is turned on, the heating wire 3235 starts to heat up, heating the molten metal in the outer cavity 3231 to compensate for its heat loss.

[0038] The flow dividing portion 324 includes a secondary flow channel 3241 , a branch flow channel 3242 and a pouring hole assembly. The pouring hole assembly includes a plurality of gates 3243 and a plurality of pouring holes 3244 .

[0039] The secondary flow channel 3241 is fixedly disposed at the bottom of the overflow portion 323 . One end of the second overflow port 3236 is communicated with the secondary flow channel 3241 , and the other end is communicated with the outer cavity 3231 . The branch flow channel 3242 is transversely disposed at the bottom of the secondary flow channel 3241 .

[0040] The gates 3243 are fixedly disposed on the bottom surface of the branch channel 3242 , and the pouring holes 3244 are disposed at the bottom of the corresponding gates 3243 . The molten metal flows from the pouring holes 3244 into the gap between the movable mold body 13 and the fixed mold body 23 .

[0041] Insert the injection nozzle of the injection molding machine into the pouring port 321, and inject molten metal liquid into the injection part 3. The metal liquid flows into the inner cavity 3232 along the main channel 322, is intercepted by the intercepting body 3234, and enters the outer cavity 3231 through the first overflow port 3233. Turn on the external power supply of the heating wire 3235, and the heating wire 3235 starts to heat up, heating the metal liquid in the outer cavity 3231 to make up for its heat loss and prevent the metal liquid from solidifying and being unable to flow. The metal liquid then flows into the secondary flow channel 3241 from the second overflow port 3236 at the bottom of the outer cavity 3231, is diverted by the branch channel 3242, enters each gate 3243, and finally flows into the gap between the movable mold body 13 and the fixed mold body 23 from the pouring hole 3244. The metal liquid stops flowing after the gap is filled. After injection and cooling under pressure for a period of time, the movable mold part 1 is opened and the injection molded mold is taken out; when the pressure of the molten metal in the secondary runner 3241 is too high, it causes it to flow upward. When it flows to the second overflow port 3236, since the cross-sectional area of ​​the second overflow port 3236 is smaller than the cross-sectional area of ​​the secondary runner 3241 and it is inclined downward, a part of the molten metal overcomes its own gravity and enters the outer cavity 3231 from the second overflow port 3236, fills the outer cavity 3231, and then flows into the inner cavity 3232 through the first overflow port 3233. Since the first overflow port 3233 is inclined downward, the molten metal needs to overcome its own weight to flow from the first overflow port 3233 into the inner cavity 3232, consuming part of its pressure, thereby effectively preventing the molten metal from overflowing from the pouring port 321.

[0042] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. Anti-metal liquid overflow mold, characterized by: include: A fixed mold part (2), the fixed mold part (2) is located below the mold, and the fixed mold part (2) provides half of the model; A movable mold part (1), the movable mold part (1) being connected to the top of the fixed mold part (2) by bolts, the movable mold part (1) providing half of the model, and when the movable mold part (1) and the fixed mold part (2) are combined, a complete model can be provided; An injection part (3), the injection part (3) is arranged at the top of the movable mold part (1), and the injection material is added to the mold through the injection part (3). The injection part (3) includes a support component and a pouring part (32), the pouring part (32) is arranged inside the support component, the pouring part (32) includes an overflow part (323) and a diversion part (324), the overflow part (323) includes an outer cavity (3231), an inner cavity (3232), a plurality of first overflow ports (3233) and a plurality of second overflow ports (3236), the inner cavity (3232) is arranged in the outer cavity In (3231), the first overflow port (3233) is arranged at the upper part of the inner cavity (3232), connecting the inner cavity (3232) with the outer cavity (3231); the second overflow port (3236) is arranged at the bottom of the outer cavity (3231), connecting the outer cavity (3231) with the diversion portion (324); if the pressure of the molten metal in the diversion portion (324) is too high, the molten metal flows into the outer cavity (3231) through the second overflow port (3236), fills the outer cavity (3231), and then flows into the inner cavity (3232) through the first overflow port (3233).

2. The metal liquid overflow prevention mold according to claim 1, characterized in that: The fixed mold part (2) comprises a base plate (21), a counterweight block (22) and a fixed mold body (23); the counterweight block (22) is fixedly arranged on the base plate (21); the fixed mold body (23) is fixedly arranged on the counterweight block (22); and the fixed mold body (23) provides half of the model.

3. The metal liquid overflow prevention mold according to claim 1, characterized in that: The movable mold part (1) comprises a pressure top (11), a pressure plate (12) and a movable mold body (13), wherein the pressure plate (12) is fixedly arranged at the bottom of the pressure top (11), and the movable mold body (13) is fixedly arranged at the bottom of the pressure plate (12), and the movable mold body (13) provides half of the model.

4. The metal liquid overflow prevention mold according to claim 1, characterized in that: The support assembly includes an injection ring (31), a heat-insulating cylinder (33) and a plurality of connecting rods (34), wherein the injection ring (31) is fixedly arranged on the top of the pressure top (11), the heat-insulating cylinder (33) is fixedly arranged on the outer ring of the pouring part (32), and one end of the connecting rod (34) is fixedly connected to the diversion part (324), and the other end is fixedly connected to the heat-insulating cylinder (33).

5. The metal liquid overflow prevention mold according to claim 4, characterized in that: The pouring portion (32) further comprises a pouring port (321) and a main channel (322), wherein the pouring port (321) is arranged in the middle of the injection ring (31), and the main channel (322) is fixedly arranged at the lower end of the pouring port (321).

6. The metal liquid overflow prevention mold according to claim 5, characterized in that: The overflow portion (323) further comprises a shut-off body (3234) and a heating wire (3235). The shut-off body (3234) is fixedly arranged at the upper portion of the inner cavity (3232) to separate the inner cavity (3232) into two disconnected upper and lower portions. The shut-off body (3234) is conical in shape, and the tip of the cone is located below the main channel (322), thereby preventing the molten metal flowing out of the main channel (322) from entering the lower portion of the inner cavity (3232). The shut-off body (3234) is located below the first overflow port (3233).

7. The metal liquid overflow prevention mold according to claim 6, characterized in that: The heating wire (3235) is located at the lower part of the inner cavity (3232) and below the shut-off body (3234). The heating wire (3235) is connected to an external power supply. When the power supply is turned on, the heating wire (3235) starts to heat up.

8. The mold for preventing molten metal from overflowing according to claim 1, characterized in that: The diversion portion (324) includes a secondary flow channel (3241), a branch flow channel (3242) and a pouring hole assembly, and the pouring hole assembly includes a plurality of gates (3243) and a plurality of pouring holes (3244).

9. The metal liquid overflow prevention mold according to claim 8, characterized in that: The secondary flow channel (3241) is fixedly arranged at the bottom end of the overflow portion (323); one end of the second overflow port (3236) is connected to the secondary flow channel (3241) and the other end is connected to the outer cavity (3231); and the branch flow channel (3242) is horizontally arranged at the bottom of the secondary flow channel (3241).

10. The mold for preventing molten metal from overflowing according to claim 8, characterized in that: The gates (3243) are all fixedly arranged on the bottom surface of the branch channel (3242), and the pouring holes (3244) are all arranged at the bottom of the corresponding gates (3243).

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