Die-casting die with internal venting

Abstract

The utility model discloses a die -casting die with internal exhaust structure relates to die -casting die technical field, and the die -casting die includes movable mould and fixed mould, and the movable mould and fixed mould form the die -casting cavity between, the movable mould and fixed mould both sides are provided with the exhaust component for the quick exhaust of die -casting cavity inside gas, the exhaust component includes first exhaust groove, second exhaust groove, third exhaust groove, first exhaust groove, second exhaust groove and third exhaust groove are along the direction away from the distribution of die -casting cavity, first exhaust groove the second exhaust groove and third exhaust groove all are formed by the gap between movable mould with fixed mould, the utility model discloses through three -level exhaust groove cooperation effect, realizes gas high -efficient orderly discharge, reduces casting defects, and the whole structure design gives consideration to exhaust efficiency and leakproofness simultaneously, prolongs the life of mould.

Description

Technical Field

[0001] This utility model relates to the field of die casting mold technology, and in particular to a die casting mold with an internal venting structure. Background Technology

[0002] In the die-casting process, molten metal fills the mold cavity at extremely high speeds. If the air already present in the cavity, gases generated by coating volatilization, and gases formed by the high-temperature vaporization of the molten metal cannot be expelled in time, it will directly affect the quality of the casting. For example, gases trapped inside the casting can easily form porosity and shrinkage cavities, leading to a decrease in the mechanical properties of the casting; gases obstructing the flow of molten metal may cause defects such as under-casting and cold shuts. In severe cases, high pressure generated by gas compression can even cause mold damage or casting scrap. Therefore, an efficient venting structure is crucial to ensuring the stable operation of the die-casting process and the quality of the casting.

[0003] In existing technologies, the venting structure of die-casting molds mostly adopts a single venting groove or a simple multi-stage groove design, which suffers from insufficient venting efficiency or poor leakage prevention performance. For example, some venting grooves, due to unreasonable depth and width design, either cannot quickly expel large amounts of gas, leading to an increased defect rate in the castings; or the gaps are too large, allowing molten metal to easily seep into the groove and cause blockages, which not only affects the venting effect but also shortens the mold's service life. Therefore, there is an urgent need for a die-casting mold with an internal venting structure to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a die-casting mold with an internal venting structure. Its advantages include: efficient and orderly gas discharge through the coordinated action of three-stage venting channels, reducing casting defects; and an overall structural design that balances venting efficiency and leak-proof performance, extending mold life.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A die-casting mold with an internal venting structure includes a moving mold and a fixed mold, wherein a die-casting cavity is formed between the moving mold and the fixed mold, and venting components for rapidly venting the gas inside the die-casting cavity are provided on both sides of the moving mold and the fixed mold.

[0007] Through the above technical solutions, the exhaust components on both sides can simultaneously extract and exhaust gas from both sides of the die-casting cavity, avoiding gas stagnation caused by untimely exhaust in one direction, greatly improving exhaust efficiency, and ensuring that gas is quickly discharged during the molten metal filling process.

[0008] Preferably, the venting assembly includes a first venting groove, a second venting groove, and a third venting groove, wherein the first venting groove, the second venting groove, and the third venting groove are distributed along a direction away from the die-casting cavity, and the first venting groove, the second venting groove, and the third venting groove are all formed by the gap between the moving mold and the fixed mold.

[0009] Through the above technical solution: the three-stage venting channels are distributed sequentially along the gas flow direction to form a relay venting path, ensuring that the gas is gradually discharged from the die-casting cavity to the outside of the mold. At the same time, the channel structure formed directly by the gap between the moving mold and the fixed mold does not require additional processing of complex cavities, which simplifies the mold manufacturing process and ensures a tight connection between the venting channel and the cavity.

[0010] Preferably, the cross-section of the first venting groove is a right trapezoid, and the height of the first venting groove gradually decreases along the direction away from the die-casting cavity.

[0011] Through the above technical solutions: the right-angled trapezoidal structure provides a large space on the side of the first exhaust channel near the die-casting cavity, which can quickly receive a large amount of initial gas. The height tapering design can form a buffer during gas flow, reducing the risk of molten metal entering with the gas, while guiding the gas to flow in a directional manner to the second exhaust channel.

[0012] Preferably, the second exhaust groove includes a first horizontal portion, a second horizontal portion, a third horizontal portion and a connecting portion, and the cross-section of the second exhaust groove is stepped.

[0013] Through the above technical solutions: the stepped structure of the second exhaust channel can form a pressure gradient by using multi-level horizontal sections to accelerate gas flow. At the same time, the steps can physically block the metal droplets that flow with the gas, reducing the probability of them entering the subsequent exhaust channel, thus balancing exhaust efficiency and leak prevention performance.

[0014] Preferably, the exhaust lengths of the first horizontal section, the second horizontal section, and the third horizontal section gradually decrease.

[0015] Through the above technical solution: the exhaust length decreases as it moves away from the die-casting cavity, and the exhaust path can be gradually reduced according to the amount of gas. At the same time, the first horizontal section closest to the die-casting cavity has the longest length to handle a large amount of initial gas. The length of subsequent horizontal sections is shortened to adapt to the characteristics of reduced gas volume and avoid gas stagnation caused by ineffective space.

[0016] Preferably, the first horizontal part, the second horizontal part, and the third horizontal part are all connected by connecting parts.

[0017] Through the above technical solutions: the connecting part seamlessly connects the horizontal parts to form a continuous exhaust channel, avoiding the accumulation of gas in the gaps between the horizontal parts. At the same time, the connecting structure enhances the overall stability of the second exhaust groove and reduces the wear of the groove body during the opening and closing of the mold.

[0018] Preferably, the cross-section of the connecting portion is inclined.

[0019] Through the above technical solutions: the inclined connecting part can guide the gas to smoothly transition along the inclined surface, avoiding the gas resistance phenomenon caused by right angle corners. At the same time, the inclined surface can cause the metal droplets flowing with the gas to sink due to gravity, further reducing the possibility of them entering the next level horizontal section.

[0020] Preferably, the third exhaust channel is connected to the second exhaust channel, and the gas is discharged to the outside of the mold through the third exhaust channel.

[0021] Through the above technical solution: the third exhaust channel, as the terminal channel of the exhaust system, is connected with the second exhaust channel to ensure that the gas can flow completely through the three-stage channel and finally be discharged smoothly outside the mold, avoiding the gas residue inside the mold and causing secondary pollution.

[0022] Preferably, the cross-section of the third exhaust groove is wavy.

[0023] Through the above technical solutions: the wave-shaped structure extends the flow path and time of the gas in the third exhaust groove, allowing the molten metal droplets in the gas to settle fully and reducing the overflow of droplets during discharge. At the same time, the wave-shaped channel can reduce the gas flow rate and avoid the high-speed airflow from scouring the external parts of the mold.

[0024] The beneficial effects of this utility model are as follows:

[0025] 1. This utility model utilizes a three-stage coordinated venting structure with first, second, and third venting channels formed by the gap between the moving mold and the fixed mold. Gas can be discharged in an orderly manner away from the die-casting cavity. The right-angled trapezoidal cross-section design of the first venting channel not only utilizes the initial large space to quickly receive gas, but also buffers the molten metal through a height-gradient design, reducing the risk of channeling. The stepped structure of the second venting channel, combined with the inclined connecting part, avoids gas stagnation and gas resistance, ensuring smooth flow. The wave-shaped design of the third venting channel extends the gas flow path, ensuring sufficient venting. Furthermore, the three channels work together to effectively reduce defects such as porosity and under-casting in castings, significantly improving product quality.

[0026] 2. In this utility model, the structural design of each venting channel takes into account both venting efficiency and leak prevention requirements. The gradually decreasing height of the first venting channel and the stepped shape and decreasing length of the second venting channel progressively block the molten metal, reducing the probability of it entering the venting channel. Simultaneously, the inclined connecting part guides the molten metal to slow down during flow, further enhancing the leak-proof effect. Furthermore, the wavy path of the third venting channel reduces molten metal splashing. These designs reduce the scouring and clogging of the venting channels by the molten metal, reduce mold wear, and extend the mold's service life. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a die-casting mold with an internal venting structure proposed in this utility model;

[0028] Figure 2 This is a cross-sectional view of the moving mold and fixed mold of a die-casting mold with an internal venting structure proposed in this utility model.

[0029] Figure 3 This is a cross-sectional plan view of a die-casting mold with an internal venting structure proposed in this utility model.

[0030] Figure 4 This utility model proposes a die-casting mold with an internal venting structure. Figure 3 Enlarged structural diagram at point A;

[0031] Figure 5 This is a schematic diagram of the disassembled structure of the moving mold and the fixed mold of a die-casting mold with an internal venting structure proposed in this utility model.

[0032] Figure 6 This utility model proposes a die-casting mold with an internal venting structure. Figure 5 A magnified structural diagram at point B in the middle.

[0033] In the figure: 1. Moving mold; 2. Fixed mold; 3. Exhaust assembly; 301. First exhaust groove; 302. Second exhaust groove; 30201. First horizontal part; 30202. Second horizontal part; 30203. Third horizontal part; 30204. Connecting part; 303. Third exhaust groove. Detailed Implementation

[0034] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0035] Reference Figures 1-6 A die-casting mold with an internal venting structure includes a moving mold 1 and a fixed mold 2, with a die-casting cavity formed between the moving mold 1 and the fixed mold 2. Both sides of the moving mold 1 and the fixed mold 2 are provided with venting components 3 for quickly venting the gas inside the die-casting cavity. The die-casting cavity formed after the moving mold 1 and the fixed mold 2 are closed provides space for the metal liquid forming. The venting components 3 on both sides can simultaneously extract and vent gas from both sides of the die-casting cavity, avoiding gas stagnation caused by untimely venting in one direction, greatly improving venting efficiency, and ensuring that gas is quickly discharged during the metal liquid filling process.

[0036] To ensure that gas is gradually discharged from the die-casting cavity to the outside of the mold, refer to the attached... Figures 3-4The venting assembly 3 includes a first venting groove 301, a second venting groove 302, and a third venting groove 303. The first venting groove 301, the second venting groove 302, and the third venting groove 303 are distributed along the direction away from the die-casting cavity. The first venting groove 301, the second venting groove 302, and the third venting groove 303 are all formed by the gap between the moving mold 1 and the fixed mold 2. The three-stage venting grooves are distributed sequentially along the gas flow direction to form a relay venting path, ensuring that the gas is gradually discharged from the die-casting cavity to the outside of the mold. At the same time, the groove structure formed directly by the gap between the moving mold 1 and the fixed mold 2 does not require additional processing of complex cavities, which simplifies the mold manufacturing process and ensures a tight connection between the venting channel and the cavity.

[0037] To ensure that the side of the first exhaust groove 301 closest to the die-casting cavity has a larger space to quickly receive a large amount of initial gas, refer to the attached diagram. Figure 4 The cross-section of the first exhaust groove 301 is a right trapezoid. The height of the first exhaust groove 301 gradually decreases along the direction away from the die-casting cavity. The right trapezoidal structure gives the side of the first exhaust groove 301 closest to the die-casting cavity a large space, which can quickly receive a large amount of initial gas. The height tapering design can form a buffer during gas flow, reducing the risk of molten metal entering with the gas, while guiding the gas to flow in a directional manner to the second exhaust groove 302.

[0038] To physically block molten metal droplets carried by the gas flow, reducing their probability of entering subsequent exhaust channels, and balancing exhaust efficiency and leak-proof performance, refer to the appendix. Figure 4 , Figure 6 The second exhaust channel 302 includes a first horizontal section 30201, a second horizontal section 30202, a third horizontal section 30203, and a connecting section 30204. The cross-section of the second exhaust channel 302 is stepped. The stepped structure of the second exhaust channel 302 can form a pressure gradient by utilizing the multi-level horizontal sections to accelerate gas flow. At the same time, the steps can physically block the metal droplets flowing with the gas, reducing the probability of them entering the subsequent exhaust channel, thus balancing exhaust efficiency and leak prevention performance.

[0039] To accommodate the reduced gas volume and avoid gas stagnation due to inefficient space, please refer to the appendix. Figure 4 The exhaust lengths of the first horizontal section 30201, the second horizontal section 30202, and the third horizontal section 30203 gradually decrease, and the exhaust length decreases as it moves away from the die-casting cavity. The exhaust path can be gradually reduced according to the amount of gas. At the same time, the first horizontal section 30201, which is closest to the die-casting cavity, has the longest length and is used to handle a large amount of initial gas. The lengths of the subsequent horizontal sections are shortened to adapt to the characteristics of reduced gas volume and avoid gas stagnation caused by ineffective space.

[0040] To enhance the overall stability of the second exhaust channel 302, refer to the attached document. Figure 4The first horizontal section 30201, the second horizontal section 30202, and the third horizontal section 30203 are all connected by a connecting section 30204. The connecting section 30204 seamlessly connects the horizontal sections to form a continuous exhaust channel, which prevents gas from accumulating in the gaps between the horizontal sections. At the same time, the connecting structure enhances the overall stability of the second exhaust groove 302 and reduces the wear on the groove during the opening and closing of the mold.

[0041] To avoid air resistance caused by right-angle corners, please refer to the attached document. Figure 4 The cross-section of the connecting part 30204 is inclined. The inclined connecting part 30204 can guide the gas to transition smoothly along the inclined surface, avoiding the gas resistance caused by right angle corners. At the same time, the inclined surface can cause the metal droplets flowing with the gas to sink due to gravity, further reducing the possibility of them entering the next level horizontal section.

[0042] To avoid secondary pollution caused by residual gas inside the mold, please refer to the attached... Figure 4 , Figure 6 The third exhaust channel 303 is connected to the second exhaust channel 302. The gas is discharged to the outside of the mold through the third exhaust channel 303. The third exhaust channel 303 serves as the terminal channel of the exhaust system. Its connection with the second exhaust channel 302 ensures that the gas can flow completely through the three-stage channel and finally be discharged smoothly to the outside of the mold, avoiding the gas from remaining inside the mold and causing secondary pollution.

[0043] To reduce gas flow rate and prevent high-speed airflow from eroding external mold components, refer to the attached... Figure 6 The cross-section of the third exhaust channel 303 is wavy. The wavy structure prolongs the flow path and time of the gas in the third exhaust channel 303, allowing the molten metal droplets in the gas to settle fully and reducing the overflow of droplets during discharge. At the same time, the wavy channel can reduce the gas flow rate and avoid the high-speed airflow from scouring the external parts of the mold.

[0044] Working principle: During the die casting process, the gas in the die casting cavity, under the pressure of the molten metal filling, first enters the first venting groove 301 formed by the gap between the moving mold 1 and the fixed mold 2. Its right-angled trapezoidal cross-section design causes the height to gradually decrease along the direction away from the die casting cavity. This allows for rapid gas intake using the initially large space, while the gradually narrowing structure buffers the molten metal, reducing the risk of molten metal entering the venting groove and improving the efficiency and stability of the initial venting stage. Subsequently, the gas enters the second venting groove 302, which is stepped and consists of a first horizontal section 30201, a second horizontal section 30202, and a third horizontal section 30203 connected sequentially by an inclined connecting section 30204. The venting length of each horizontal section gradually decreases, and the inclined connecting section 30204 prevents gas from escaping along the steps. The corner stagnation creates air resistance, which, combined with the decreasing length design, ensures smooth gas flow in stages. The stepped structure further blocks molten metal, enhancing leak-proof performance. Finally, the gas exits the mold through the third venting channel 303, which connects to the second venting channel 302. Its wavy cross-section reduces gas velocity through a tortuous path, decreasing the probability of molten metal droplets overflowing with the gas. It also extends the gas's flow time within the channel, ensuring complete gas discharge. The entire venting process, through the synergistic effect of the three venting channels, achieves efficient and orderly gas discharge from the die-casting cavity to the outside of the mold, effectively reducing defects such as porosity and undercasting in the casting, improving product quality. Furthermore, the structural design of each channel balances venting efficiency and leak-proof performance, extending the mold's service life.

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A die-casting mold with an internal venting structure, comprising a moving mold (1) and a fixed mold (2), characterized in that, A die-casting cavity is formed between the moving mold (1) and the fixed mold (2). Both sides of the moving mold (1) and the fixed mold (2) are provided with exhaust components (3) for quickly discharging the gas inside the die-casting cavity. The exhaust components (3) include a first exhaust groove (301), a second exhaust groove (302), and a third exhaust groove (303). The first exhaust groove (301), the second exhaust groove (302), and the third exhaust groove (303) are distributed in a direction away from the die-casting cavity. The first exhaust groove (301), the second exhaust groove (302), and the third exhaust groove (303) are all formed by the gap between the moving mold (1) and the fixed mold (2).

2. A die-casting mold with an internal venting structure according to claim 1, characterized in that, The cross-section of the first venting groove (301) is a right trapezoid, and the height of the first venting groove (301) gradually decreases along the direction away from the die-casting cavity.

3. A die-casting mold with an internal venting structure according to claim 2, characterized in that, The second exhaust groove (302) includes a first horizontal part (30201), a second horizontal part (30202), a third horizontal part (30203) and a connecting part (30204), and the cross-section of the second exhaust groove (302) is stepped.

4. A die-casting mold with an internal venting structure according to claim 3, characterized in that, The exhaust lengths of the first horizontal section (30201), the second horizontal section (30202), and the third horizontal section (30203) gradually decrease.

5. A die-casting mold with an internal venting structure according to claim 4, characterized in that, The first horizontal section (30201), the second horizontal section (30202), and the third horizontal section (30203) are all connected to each other by a connecting section (30204).

6. A die-casting mold with an internal venting structure according to claim 5, characterized in that, The cross-section of the connecting part (30204) is inclined.

7. A die-casting mold with an internal venting structure according to claim 6, characterized in that, The third exhaust channel (303) is connected to the second exhaust channel (302), and the gas is discharged to the outside of the mold through the third exhaust channel (303).

8. A die-casting mold with an internal venting structure according to claim 7, characterized in that, The cross-section of the third exhaust groove (303) is wavy.

Images