Vacuum die-casting exhaust die for new energy automobile PTC aluminum shell

Abstract

The invention is suitable for the technical field of vacuum die-casting exhaust dies, and provides a new energy automobile PTC aluminum shell vacuum die-casting exhaust die which comprises a fixed die, a movable die assembly is arranged on one side of the fixed die, a product cavity is formed in the middle of the fixed die and the movable die assembly, exhaust holes are formed in a movable die frame in a penetrating mode, and the exhaust holes are communicated with the movable die assembly. A first containing groove is formed in the movable mold core in a penetrating mode, a second containing groove is formed in the movable mold insert in a penetrating mode, the exhaust hole, the first containing groove and the second containing groove communicate with one another, exhaust needles are arranged in the first containing groove and the second containing groove, and the outer sides of the exhaust needles are sleeved with one-way exhaust plugs. The one-way exhaust plugs are arranged in the middle of the first containing groove and the middle of the second containing groove, the exhaust needle is further limited through the one-way exhaust plugs, sliding of the exhaust needle in the working process is reduced, and the possibility of reverse suction of the exhaust needle is reduced on the basis that sliding is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum die-casting exhaust dies, and more specifically, to a vacuum die-casting exhaust dies for PTC aluminum shells of new energy vehicles. Background Art

[0002] PTC aluminum shell die-casting is a molding technology that uses a high-pressure die-casting process to form a PTC aluminum shell from molten aluminum alloy. It is widely used in fields such as new energy vehicles. This process uses the powerful pressure of the die-casting machine to inject high-temperature molten aluminum alloy into the mold cavity at high speed. Under the action of pressure, the molten aluminum quickly fills the cavity and cools and solidifies, thus forming a PTC aluminum shell with a complex structure in one go.

[0003] At present, due to the complex structure of new energy PTC shell products, there are many independent cavities with large surface differences. The independent cavities are not fed smoothly during the die-casting aluminum liquid filling process, and there is a serious air entrapment situation. Therefore, in the actual die-casting process, vacuuming is usually used to assist the exhaust structure to exhaust, so that the aluminum liquid fills the cavity more evenly. The existing vacuuming method is to set a conventional ejector at the filling end for exhaust treatment.

[0004] However, when the aluminum liquid is filled by injection, the vacuum is started and a negative pressure is formed in the mold cavity. The conventional exhaust ejector position will leak and suck gas into the cavity, making the vacuum pump lose a certain effect. This paper proposes a vacuum die-casting exhaust mold for PTC aluminum shells of new energy vehicles to improve the existing problems. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a vacuum die-casting exhaust mold for the PTC aluminum shell of new energy vehicles.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A vacuum die-casting exhaust mold for a PTC aluminum shell of a new energy vehicle includes a fixed mold, a movable mold assembly is provided on one side of the fixed mold, a product cavity is provided in the middle position of the fixed mold and the movable mold assembly, and the fixed mold and movable mold assembly cooperate with the product cavity to complete the die-casting of the product.

[0008] The movable mold assembly includes a movable mold frame, a movable mold core, and a movable mold insert in sequence. The movable mold frame is provided with an exhaust hole, the movable mold core is provided with a first placement groove, and the movable mold insert is provided with a second placement groove. The exhaust hole, the first placement groove, and the second placement groove are connected. Exhaust needles are provided inside the first placement groove and the second placement groove, and a one-way exhaust plug is provided on the outside of the exhaust needle.

[0009] The present invention is further configured as follows: the exhaust needle includes an inlay needle, the inlay needle is arranged inside the first placement groove and the second placement groove, the inlay needle is configured as a cylindrical structure, the diameter of the inlay needle is smaller than the inner diameter of the first placement groove and the second placement groove, and the gap position formed by the inlay needle and the first placement groove and the second placement groove constitutes an air-avoiding exhaust position.

[0010] The present invention is further configured as follows: a countersunk body is provided at one end of the inlay pin, the countersunk body is configured as a cylindrical structure, and the diameter of the countersunk body is greater than the diameter of the inlay pin.

[0011] The present invention is further configured as follows: a countersunk groove is provided at one end of the first placement groove close to the exhaust hole, the countersunk body is provided inside the countersunk groove, the diameter of the countersunk body is smaller than the inner diameter of the countersunk groove, and the gap between the countersunk body and the countersunk groove constitutes a countersunk exhaust groove.

[0012] The present invention is further configured as follows: a shell is sleeved on the outer side of the countersunk head body, the shell is configured as a special-shaped structure, and the outer side wall of the shell is in contact with the inner side wall of the countersunk head groove.

[0013] The present invention is further configured as follows: the housing includes two countersunk positioning surfaces, one of which cooperates with the movable mold frame, and the other countersunk positioning surface cooperates with the movable mold core.

[0014] The present invention is further configured as follows: a fitting is provided at one end of the inlay pin away from the countersunk body, the fitting is configured as a cylindrical structure, the diameter of the fitting is larger than the diameter of the inlay pin, and the fitting is provided inside the second placement groove.

[0015] The present invention is further configured as follows: the one-way exhaust plug includes a tapered portion, the tapered portion is configured as a tapered structure, a sleeve is provided at the larger end of the tapered portion, and the sleeve and the tapered portion are integrally formed.

[0016] The present invention is further configured as follows: the conical portion is arranged inside the first placement groove, the conical portion is sleeved on the outside of the inlay pin, the outer side wall of the larger end of the conical portion is in contact with the inner side wall of the first placement groove, and the inner side wall of the smaller end of the conical portion is in contact with the outer side wall of the inlay pin.

[0017] The present invention is further configured as follows: the sleeve is arranged inside the second placement groove, the outer wall of the sleeve is fitted with the inner wall of the second placement groove, the inlay pin is arranged inside the sleeve, and the inner diameter of the sleeve is larger than the diameter of the inlay pin.

[0018] By adopting the above technical solution, by setting the inner diameter of the sleeve to be larger than the diameter of the pin, the annular gap formed provides a channel for gas flow, so that the gas at the end of the product cavity filling can smoothly flow through the gap to the subsequent exhaust structure; the fitting surface of the tapered portion and the pin not only reduces the possibility of the pin sliding through a tight fit, but also reduces excessive obstruction to the gas flow, so that the gas can flow along the tiny gap of the tapered surface. In addition, the sealing property of the rubber material is better than that of the rigid material, and its tapered portion and sleeve can form a tighter seal with the corresponding fitting surface. When a vacuum is drawn to form a negative pressure, the elasticity of the rubber will further reduce the gap between the fitting surfaces, effectively preventing external gas from being sucked back into the cavity through the gap between the components.

[0019] In summary, this application includes at least one of the following beneficial technical effects:

[0020] 1. By setting the diameter of the mating part to be slightly smaller than the diameter of the second placement groove, the gap between the mating part and the second placement groove is kept less than ten threads on one side, reducing the possibility of aluminum alloy solution entering the inlay pin. At the same time, because there is a gap of less than ten threads between the second placement groove and the mating part, the gas at the end of filling the product cavity can be discharged through this gap.

[0021] 2. By setting up an air-avoiding exhaust position, an annular gap is formed by the cylindrical pin and the first and second placement grooves with larger diameters, which provides a discharge path for the gas at the end of the cavity filling. In addition, under the vacuum working conditions of vacuum die casting, the gas can move quickly along the gap toward the exhaust hole under the action of pressure, reducing the occurrence of melt filling obstruction caused by poor exhaust.

[0022] 3. By setting a shell on the outside of the countersunk body, the shell includes two countersunk positioning surfaces. The two countersunk positioning surfaces cooperate with the movable mold frame and the movable mold core respectively to reduce the possibility of the countersunk body moving.

[0023] 4. By setting a one-way exhaust plug in the middle position of the first placement groove and the second placement groove, the exhaust needle is further limited by the one-way exhaust plug to reduce the sliding of the exhaust needle during the working process, and on the basis of reducing the sliding, the possibility of the exhaust needle inhaling air is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of a vacuum die-casting exhaust mold for a PTC aluminum shell of a new energy vehicle in the present invention.

[0025] Figure 2 for Figure 1 Schematic diagram of the structure cut along AA in the middle.

[0026] Figure 3 for Figure 2 Front view of .

[0027] Figure 4 for Figure 2 Schematic diagram of the enlarged structure of area B in the middle.

[0028] Figure 5 for Figure 3 Schematic diagram of the enlarged structure of area C in the middle.

[0029] Figure 6 It is a structural schematic diagram of the product cavity in the present invention.

[0030] Figure 7 It is a schematic diagram of the matching structure of the exhaust needle and the one-way exhaust plug in the present invention.

[0031] Figure 8 for Figure 7 Isometric view of a .

[0032] Figure 9 for Figure 7 Front view of .

[0033] Figure 10 for Figure 7 Schematic diagram of the explosion structure.

[0034] Description of reference numerals: 1, fixed mold;

[0035] 2. Moving mold assembly; 21. Moving mold frame; 22. Moving mold core; 23. Moving mold insert; 24. Exhaust pin; 241. Countersunk body; 242. Housing; 243. Insert pin; 244. Matching piece; 26. One-way exhaust plug; 261. Conical portion; 262. Sleeve; 27. Exhaust hole; 28. First placement groove; 29. ​​Second placement groove;

[0036] 3. Product cavity. DETAILED DESCRIPTION

[0037] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0039] See also Figures 1-10 , the present invention provides the following technical solutions:

[0040] Example 1, see Figure 1A vacuum die-casting exhaust mold for PTC aluminum shells of new energy vehicles includes a fixed mold 1, a movable mold assembly 2 is provided on one side of the fixed mold 1, and a product cavity 3 is provided in the middle position of the fixed mold 1 and the movable mold assembly 2. The fixed mold 1 and the movable mold assembly 2 cooperate with the product cavity 3 to complete the die-casting of the product.

[0041] In actual application, the aluminum liquid is injected into the casting channel through the pouring port on the fixed mold 1 and flows along the casting channel to the position of the product cavity 3. Finally, it cooperates with the movable mold assembly 2 to complete the die casting of the product.

[0042] Existing new energy PTC shell products have high requirements for air tightness and complex product structures. Therefore, the product cavity 3 has many independent cavities with large surface height differences, and the independent cavities provide the basis for the die-casting of the product.

[0043] See Figure 6 However, during the process of filling the die-cast aluminum liquid, when the end of the product is full, the independent deep cavity position has not been filled. At this time, the independent deep cavity feeding is not smooth, which will cause the gas in the deep cavity position to be unable to be discharged, resulting in a more serious air trapping situation.

[0044] In order to alleviate the serious air entrapment situation during the die-casting of the product, a corresponding structure is provided on the movable mold assembly 2 to perform auxiliary exhaust treatment.

[0045] The specific structure of the movable mold assembly 2 is as follows:

[0046] See Figure 2-Figure 5 The movable mold assembly 2 includes a movable mold frame 21, a movable mold core 22, a movable mold insert 23 and a product cavity 3 in sequence. An exhaust hole 27 is opened through the movable mold frame 21, a first placement groove 28 is opened through the movable mold core 22, and a second placement groove 29 is opened through the movable mold insert 23. The exhaust hole 27, the first placement groove 28 and the second placement groove 29 are connected, and an exhaust needle 24 is provided inside the first placement groove 28 and the second placement groove 29.

[0047] Among them, the exhaust needle 24 and the second placement groove 29, the first placement groove 28, and the exhaust hole 27 constitute an exhaust channel. During the vacuum filling process, the gas at the filling end of the product cavity 3 can be discharged in sequence through the gaps between the exhaust needle 24 and the second placement groove 29, the first placement groove 28, and the exhaust hole 27, which is conducive to the normal progress of the die-casting work.

[0048] Specifically, when the aluminum alloy melt gradually fills the end of the product cavity 3, the residual gas can be directly pushed to the vicinity of the exhaust needle 24, and through the gap between the exhaust needle 24 and the first placement groove 28 and the second placement groove 29, and then quickly discharged along the exhaust hole 27, reducing the risk of trapped gas at the end of the product cavity 3.

[0049] By setting up an exhaust channel, that is, the second placement groove 29, the first placement groove 28, the exhaust hole 27 and the exhaust needle 24 form an exhaust channel, the exhaust channel directly acts on the filling end of the product cavity 3. When the aluminum alloy melt is filled to the end, the residual gas can be pushed to the vicinity of the exhaust needle 24 and quickly discharged through the gap of the exhaust channel, reducing the serious air trapped at the end of the product cavity 3.

[0050] The specific structure of the exhaust needle 24 is as follows:

[0051] See Figure 7-10 The exhaust needle 24 includes an inlay needle 243, which is arranged inside the first placement groove 28 and the second placement groove 29. The inlay needle 243 is set to a cylindrical structure. The diameter of the inlay needle 243 is smaller than the inner diameter of the first placement groove 28 and the second placement groove 29. The gap position formed by the inlay needle 243 and the first placement groove 28 and the second placement groove 29 constitutes an air-avoiding exhaust position.

[0052] Among them, since the diameter of the inserting pin 243 is smaller than the inner diameter of the first placement groove 28 and the second placement groove 29, an air-avoiding exhaust position is formed between the inserting pin 243 and the first placement groove 28 and the second placement groove 29. The air-avoiding exhaust position is a gas flow channel, which facilitates the discharge of the gas at the end of filling the product cavity 3.

[0053] The air-avoiding exhaust position is formed by an annular gap between the cylindrical pin 243 and the first placement groove 28 and the second placement groove 29 with larger diameters, which provides an exhaust path for the gas at the end of the cavity filling. When the aluminum alloy melt is filled to the end of the product cavity 3, the residual gas is pushed to the exhaust area by the melt and can flow quickly through the annular gap, reducing the situation of local accumulation and formation of trapped gas.

[0054] In addition, under the vacuum condition of vacuum die casting, the gas can move quickly along the gap toward the exhaust hole 27 under the action of pressure, reducing the problem of melt filling being blocked due to poor exhaust.

[0055] See Figure 7-10 A countersunk body 241 is provided at one end of the inlay pin 243 . The countersunk body 241 is configured as a cylindrical structure, and the diameter of the countersunk body 241 is greater than the diameter of the inlay pin 243 .

[0056] See Figure 7-10 A countersunk groove is provided at one end of the first placement groove 28 close to the exhaust hole 27, and the countersunk body 241 is provided inside the countersunk groove. The diameter of the countersunk body 241 is smaller than the inner diameter of the countersunk groove, and the gap between the countersunk body 241 and the countersunk groove constitutes a countersunk exhaust groove.

[0057] See Figure 7-10The outer side of the countersunk body 241 is provided with a shell 242, and the shell 242 is set as a special-shaped structure. The outer side wall of the shell 242 is in contact with the inner side wall of the countersunk groove.

[0058] The housing 242 includes two countersunk positioning surfaces, one of which cooperates with the movable mold frame 21 , and the other countersunk positioning surface cooperates with the movable mold core 22 .

[0059] Among them, since the diameter of the countersunk body 241 is smaller than the inner diameter of the countersunk groove, a countersunk exhaust groove is formed between the countersunk body 241 and the countersunk groove. The countersunk exhaust groove provides a flow channel for gas, which facilitates the discharge of gas. The gas reaching the filling end of the product cavity 3 flows to the position of the countersunk exhaust groove through the air-avoiding exhaust position, and then is discharged to the position of the exhaust hole 27.

[0060] During the actual exhaust process, in order to reduce the possibility of the pin 243 moving, a shell 242 is sleeved on the outside of the countersunk body 241. The shell 242 includes two countersunk positioning surfaces, one of which cooperates with the movable mold frame 21, and the countersunk positioning surface specifically cooperates with the exhaust hole 27, and the other countersunk positioning surface cooperates with the movable mold core 22, and the countersunk positioning surface specifically cooperates with the first placement groove 28. The possibility of the countersunk body 241 moving is reduced by cooperating with the movable mold frame 21 and the movable mold core 22 respectively through the two countersunk positioning surfaces.

[0061] In order to reduce the movement of the countersunk body 241, the gas also needs to be discharged. Therefore, the shell 242 is set to a special-shaped structure. The shell 242 wraps a part of the countersunk body 241, so that there is still an exhaust space between the countersunk body 241 and the countersunk groove, so that the gas can be discharged.

[0062] The shell 242 is composed of two quarter-sector cylinders, which are symmetrically arranged and integrally formed. Therefore, the two sides of the shell 242 do not completely cover the countersunk body 241, that is, there is a gap between the shell 242 and the countersunk groove, thereby setting a flow channel for the gas to allow the gas to pass through.

[0063] Specifically, when the gas flows from the air-avoiding discharge formed by the first placement groove 28, the second placement groove 29 and the inlay pin 243 to the countersunk exhaust groove formed by the shell 242, the countersunk body 241 and the countersunk groove, finally, since a countersunk positioning surface of the shell 242 cooperates with the exhaust hole 27, the gas is discharged from the exhaust hole 27 to the outside of the mold.

[0064] The two countersunk positioning surfaces of the shell 242 cooperate with the movable mold frame 21 and the movable mold core 22 respectively, and effectively limit the axial and radial movement of the countersunk body 241 and the pin 243 through surface contact, reducing the possibility of fluctuations in the gap size of the air vent position and the countersunk vent groove due to component offset. In addition, it also disperses the impact force during the die-casting process, reduces the wear of the pin 243, the shell 242 and the mold components, extends the service life of the mold, and reduces maintenance costs.

[0065] The above structure provides a flow channel for gas discharge. However, in the process of filling the aluminum alloy solution, in order to reduce the aluminum liquid from entering the second placement groove 29 and the first placement groove 28, the structure of the exhaust needle 24 is further set to reduce the aluminum liquid from penetrating into the first placement groove 28 and the second placement groove 29, that is, to reduce the aluminum liquid from penetrating into the position of the inlay needle 243.

[0066] See Figure 7-10 A fitting part 244 is provided at one end of the insert pin 243 away from the countersunk body 241 . The fitting part 244 is set as a cylindrical structure. The diameter of the fitting part 244 is larger than the diameter of the insert pin 243 . The fitting part 244 is set inside the second placement groove 29 .

[0067] The diameter of the fitting 244 is slightly smaller than the diameter of the second placement groove 29. The gap between the fitting 244 and the second placement groove 29 is kept less than ten threads on one side, reducing the possibility of the aluminum alloy solution entering the inlay pin 243. At the same time, because there is a gap of less than ten threads between the second placement groove 29 and the fitting 244, the gas at the end of filling the product cavity 3 can be discharged from this gap. The diameter of the fitting 244 is larger than the inlay pin 243 and is matched with the second placement groove 29. This stepped structure plays an auxiliary positioning role for the inlay pin 243.

[0068] During the die-casting process, the impact force of the melt and the opening and closing vibration of the mold may cause the pin 243 to shift slightly, and the fit between the fitting 244 and the second placement groove 29 can reduce the radial shaking of the pin 243, so that the air-avoiding venting gap formed by the pin 243 and the first placement groove 28 and the second placement groove 29 can be more stable, reducing the possibility of the exhaust channel size fluctuating due to the offset of the pin 243. At the same time, the existence of the fitting 244 also shares the axial force on the pin 243, reduces its deformation caused by long-term stress, and extends the service life of the component.

[0069] Specifically, during the filling process of die-cast aluminum liquid, when the aluminum alloy melt gradually fills the end of the product cavity 3, the residual gas can be directly pushed to the vicinity of the fitting 244. Since there is a gap of less than ten threads between the fitting 244 and the second placement groove 29, the residual gas flows through the gap to the position of the air-avoiding exhaust position formed by the countersunk body 241 and the first placement groove 28 and the second placement groove 29. Under the action of vacuum, the gas continues to flow to the position of the countersunk exhaust groove formed by the countersunk body 241, the shell 242 and the countersunk groove, and finally, it flows from the position of the countersunk exhaust groove to the position of the exhaust hole 27, and the gas is discharged out of the mold through the exhaust hole 27.

[0070] In the second embodiment, the mold can be vented by providing an exhaust needle 24, but when the aluminum liquid is filled by injection, the vacuum is started and a negative pressure is formed in the mold cavity. Since the exhaust needle 24 passes through the movable mold insert 23 and the movable mold core 22, there are air-avoiding exhaust positions between the exhaust needle 24 and the first placement groove 28 and the second placement groove 29, and there are small gaps between the fitting 244 and the second placement groove 29. These channels should be exhaust paths, but when a negative pressure is formed in the cavity, if the sealing performance of the channel is insufficient, the gas in other areas will flow back into the cavity along these gaps under the drive of the pressure difference, and air leakage will occur at the exhaust needle 24 position, and the gas will be sucked back into the cavity, causing the vacuum to lose a certain effect.

[0071] In order to further enhance the sealing performance of the exhaust needle 24 , a sealing structure is provided on the outer side of the exhaust needle 24 . Specifically, a one-way exhaust plug 26 is sleeved on the outer side of the exhaust needle 24 .

[0072] The sealing of the exhaust needle 24 is enhanced by providing a one-way exhaust plug 26. The specific structure of the one-way exhaust plug 26 is as follows:

[0073] See Figure 7-10 The one-way exhaust plug 26 includes a tapered portion 261 , which is configured as a tapered structure. A sleeve 262 is provided at a larger end of the tapered portion 261 , and the sleeve 262 and the tapered portion 261 are integrally formed.

[0074] See Figure 7-10 The conical portion 261 is arranged inside the first placement groove 28, and the conical portion 261 is sleeved on the outside of the inlay pin 243. The outer wall of the larger end of the conical portion 261 fits with the inner wall of the first placement groove 28, and the inner wall of the smaller end of the conical portion 261 fits with the outer wall of the inlay pin 243.

[0075] See Figure 7-10 The sleeve 262 is arranged inside the second placement groove 29, the outer wall of the sleeve 262 is in contact with the inner wall of the second placement groove 29, the inlay pin 243 is arranged inside the sleeve 262, and the inner diameter of the sleeve 262 is larger than the diameter of the inlay pin 243.

[0076] Based on the second placement groove 29, the first placement groove 28, the exhaust hole 27 and the exhaust needle 24 forming an exhaust channel, on this basis, a one-way exhaust plug 26 is set in the middle position of the first placement groove 28 and the second placement groove 29. The exhaust needle 24 is further limited by the one-way exhaust plug 26 to reduce the sliding of the exhaust needle 24 during the working process, and on the basis of reducing the sliding, the possibility of the exhaust needle 24 inhaling air is reduced.

[0077] The one-way exhaust plug 26 has two end faces, one of which cooperates with the movable mold core 22, and the other end face cooperates with the movable mold insert 23, that is, the outer wall of the sleeve 262 cooperates with the second placement groove 29, and the outer wall of the larger end of the conical part 261 cooperates with the inner wall of the first placement groove 28.

[0078] The combined design of the tapered portion 261 and the sleeve 262 forms a limit for the insert needle 243 , thereby reducing the possibility of the exhaust needle 24 sliding.

[0079] The outer wall of the larger end of the conical portion 261 fits tightly with the inner wall of the first placement groove 28, and the inner wall of the smaller end fits with the outer wall of the insert pin 243. Through the radial constraint of the conical structure, the axial movement and radial deviation of the insert pin 243 in the first placement groove 28 area are reduced; the outer wall of the sleeve 262 fits with the inner wall of the second placement groove 29, further constraining the sliding space of the insert pin 243 in the second placement groove 29 area. This combination of conical clamping and sleeve 262 guidance reduces the disturbance of the exhaust needle 24 caused by the impact of aluminum liquid and mold vibration during the die-casting process.

[0080] In addition, the one-way exhaust plug 26 is made of high-temperature resistant rubber material. The high-temperature resistant flexible rubber material is compressible and elastic, which can make the conical portion 261 fit more closely with the inner wall of the first placement groove 28 and the outer wall of the insert pin 243, and the sleeve 262 fits more firmly with the inner wall of the second placement groove 29. During the die-casting process, compared with rigid materials, the flexible rubber has a larger contact area with the insert pin 243, the first placement groove 28, and the second placement groove 29, and has stronger friction, which can more effectively resist the disturbance caused by the impact of aluminum liquid and the vibration of the mold, and significantly improve the structural stability of the exhaust needle 24.

[0081] The one-way exhaust plug 26 reduces the sliding of the insert pin 243 and provides a basis for the exhaust of the filling end gas by further setting the exhaust channel.

[0082] The inner diameter of the sleeve 262 is larger than the diameter of the pin 243, and the annular gap formed therein provides a channel for gas flow, so that the gas at the end of filling the product cavity 3 can smoothly flow through the gap to the subsequent exhaust structure; the fitting surface of the tapered portion 261 and the pin 243 reduces the possibility of sliding of the pin 243 through tight fit, while reducing excessive obstruction to the flow of gas, so that the gas can flow along the tiny gap of the tapered surface, facilitating the discharge of the gas.

[0083] In addition, the sealing performance of rubber material is better than that of rigid material. Its tapered portion 261 and sleeve 262 can form a tighter seal with the corresponding mating surfaces. When vacuum is drawn to form negative pressure, the elasticity of the rubber will further reduce the gap between the fitting surfaces, effectively preventing external gas from being sucked back into the cavity through the gap between the components.

[0084] In actual application, the conical portion 261 and the sleeve 262 can dynamically adjust the gap with the mating surface as the pressure changes during the die-casting process. When the gas gathers at the end of the cavity filling to form a local high pressure, the rubber will produce a slight deformation along the direction of the gas flow, widening the exhaust channel, that is, the gas flows through the gap between the sleeve 262 and the insert pin 243 and is discharged to the exhaust hole 27; and when the gas pressure decreases, the rubber automatically rebounds to restore the seal, reducing the possibility of reverse leakage.

[0085] Specifically, when the aluminum liquid is filled by injection, the vacuum is started, and a negative pressure is formed in the mold cavity. The tapered portion 261 fits against the pin 243, reducing the possibility of external gas being sucked back through the exhaust hole 27; when the aluminum liquid is filled to the end of the product cavity 3, the gas will be pushed to the position of the fitting 244, and the gas flows in from the gap between the fitting 244 and the second placement groove 29, and the gas then flows through the second placement groove 29 to the gap between the sleeve 262 and the pin 243. Since the sleeve 262 and the tapered portion 261 are both made of high-temperature resistant rubber, the tapered portion 261 will form a gap with the pin 243 under the impact of the gas. This gap facilitates the gas to flow from the gap between the sleeve 262 and the pin 243 to the gap position between the first placement groove 28 and the pin 243. The gas continues to flow from this position, and finally the gas flows through the gap between the countersunk body 241 and the countersunk groove to the position of the exhaust hole 27, and then is discharged from the outside of the mold through the exhaust hole 27, completing the exhaust of the end gas.

[0086] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

Claims

1. A vacuum die-casting exhaust mold for PTC aluminum housing of new energy vehicles, characterized by: The invention comprises a fixed mold (1), a movable mold assembly (2) is provided on one side of the fixed mold (1), a product cavity (3) is provided in the middle of the fixed mold (1) and the movable mold assembly (2), and the fixed mold (1) and the movable mold assembly (2) cooperate with the product cavity (3) to complete the die casting of the product; The movable mold assembly (2) comprises a movable mold frame (21), a movable mold core (22) and a movable mold insert (23) in sequence. An exhaust hole (27) is provided on the movable mold frame (21), a first placement groove (28) is provided on the movable mold core (22), and a second placement groove (29) is provided on the movable mold insert (23). The exhaust hole (27), the first placement groove (28) and the second placement groove (29) are connected. An exhaust needle (24) is provided inside the first placement groove (28) and the second placement groove (29), and a one-way exhaust plug (26) is provided on the outer side of the exhaust needle (24).

2. The vacuum die-casting exhaust mold for a PTC aluminum housing of a new energy vehicle according to claim 1, characterized in that: The exhaust needle (24) comprises an inlay needle (243), which is arranged inside the first placement groove (28) and the second placement groove (29). The inlay needle (243) is arranged as a cylindrical structure. The diameter of the inlay needle (243) is smaller than the inner diameter of the first placement groove (28) and the second placement groove (29). The gap formed by the inlay needle (243) and the first placement groove (28) and the second placement groove (29) constitutes an air-avoiding exhaust position.

3. The vacuum die-casting exhaust mold for a PTC aluminum housing of a new energy vehicle according to claim 2, characterized in that: A countersunk body (241) is provided at one end of the inlay pin (243). The countersunk body (241) is configured as a cylindrical structure, and the diameter of the countersunk body (241) is greater than the diameter of the inlay pin (243).

4. The vacuum die-casting exhaust mold for a PTC aluminum housing of a new energy vehicle according to claim 3, characterized in that: A countersunk groove is provided at one end of the first placement groove (28) close to the exhaust hole (27); the countersunk body (241) is provided inside the countersunk groove; the diameter of the countersunk body (241) is smaller than the inner diameter of the countersunk groove; and the gap between the countersunk body (241) and the countersunk groove constitutes a countersunk exhaust groove.

5. The vacuum die-casting exhaust mold for a PTC aluminum housing of a new energy vehicle according to claim 4, characterized in that: The outer side of the countersunk head body (241) is sleeved with a shell (242), and the shell (242) is configured as a special-shaped structure, and the outer side wall of the shell (242) is fitted with the inner side wall of the countersunk head groove.

6. The vacuum die-casting exhaust mold for a PTC aluminum housing of a new energy vehicle according to claim 5, characterized in that: The housing (242) includes two countersunk positioning surfaces, one of which cooperates with the movable mold frame (21), and the other countersunk positioning surface cooperates with the movable mold core (22).

7. The vacuum die-casting exhaust mold for a PTC aluminum housing of a new energy vehicle according to claim 6, characterized in that: A matching piece (244) is provided at one end of the insert pin (243) away from the countersunk body (241). The matching piece (244) is configured as a cylindrical structure. The diameter of the matching piece (244) is larger than the diameter of the insert pin (243). The matching piece (244) is disposed inside the second placement groove (29).

8. The vacuum die-casting exhaust mold for a PTC aluminum housing of a new energy vehicle according to claim 7, characterized in that: The one-way exhaust plug (26) comprises a tapered portion (261) which is configured as a tapered structure. A sleeve (262) is provided at the larger end of the tapered portion (261). The sleeve (262) and the tapered portion (261) are integrally formed.

9. The vacuum die-casting exhaust mold for a PTC aluminum housing of a new energy vehicle according to claim 8, characterized in that: The conical portion (261) is arranged inside the first placement groove (28), and the conical portion (261) is sleeved on the outside of the inlay pin (243). The outer side wall of the larger end of the conical portion (261) fits with the inner side wall of the first placement groove (28), and the inner side wall of the smaller end of the conical portion (261) fits with the outer side wall of the inlay pin (243).

10. The vacuum die-casting exhaust mold for a PTC aluminum housing of a new energy vehicle according to claim 9, characterized in that: The sleeve (262) is arranged inside the second placement groove (29), the outer wall of the sleeve (262) is in contact with the inner wall of the second placement groove (29), the inlay pin (243) is arranged inside the sleeve (262), and the inner diameter of the sleeve (262) is larger than the diameter of the inlay pin (243).

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