Die for squeeze casting of battery pack bracket

Abstract

The utility model discloses a die for squeeze casting of a battery pack support, which comprises a movable die core and a fixed die core, a runner and a cavity communicated with the runner are arranged between the movable die core and the fixed die core, and the cavity comprises two independent sub-cavities distributed in bilateral symmetry. Each sub-cavity is defined by a movable mold side cavity and a fixed mold side cavity, the movable mold side cavity is designed to be matched with the deep cavity structure side shape of a battery pack support to be subjected to extrusion casting, and a water core structure is arranged at the position, close to the L-shaped thick wall of the battery pack support to be subjected to extrusion casting, in the movable mold core; the mold has the advantages that the insert type water core structure is additionally arranged in the area, close to the L-shaped thick wall of the battery pack support, in the movable mold core, the cooling speed of the local area of the movable mold core is increased, the mold temperature balance of the mold core is achieved, and the shrinkage cavity defect in the L-shaped thick wall of the battery pack support is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of manufacturing mould of automobile accessories, and relates to an extrusion casting mould, in particular to a mould for extrusion casting battery pack support. BACKGROUND

[0002] With the rapid development of economy, automobiles have become an indispensable means of transportation in people's daily life. Especially in the field of new energy vehicles, especially pure electric vehicles, due to the strong support of national policy and the improvement of public recognition, major automobile manufacturers have successively launched pure electric vehicle products. These pure electric vehicles generally adopt the structure form of hanging a whole battery pack under the chassis, and the battery pack support as a key anti-vibration accessory plays an important role in connecting the automobile body and the battery pack.

[0003] As shown in Figure 1 A battery pack support A of the prior art, the overall wall thickness of which is relatively thick, the thick wall of the proximal end is in L type, the wall thickness of the L type thick wall A1 is usually above 20mm, the distal end wall is thin, and the battery pack support has a deep cavity structure A2. The battery pack support usually adopts a die extrusion casting process in the production process.

[0004] The existing extrusion casting mould comprises a fixed mould frame, a fixed mould core, a movable mould core and a movable mould frame arranged in sequence, a flow channel and two mould cavities in communication with the flow channel are arranged between the fixed mould core and the movable mould core, the flow channel comprises a main flow channel, two branch flow channels and two inner pouring flow channels, the two branch flow channels are symmetrically arranged on both sides of the width direction of the main flow channel, the outer side of each branch flow channel in the width direction is in an outward convex R angle structure, the connection between each branch flow channel and the main flow channel is smooth and natural transition, the two inner pouring flow channels are correspondingly arranged on the top of the two branch flow channels, the inner side of each inner pouring flow channel in the width direction is in an outward convex R angle structure, the main flow channel, the branch flow channel and the inner pouring flow channel are sequentially communicated to form a Y type flow channel structure, the thickness of the main flow channel is greater than that of the branch flow channel, the size of the inner pouring port of the inner pouring flow channel is slightly smaller than that of the cross section of the branch flow channel, and the inner pouring ports of the two inner pouring flow channels are in one-to-one communication with the two mould cavities. This extrusion casting mould can effectively improve the feeding capacity and improve the shrinkage cavity phenomenon, thereby greatly reducing the product failure rate. However, the battery pack support produced by using this extrusion casting mould still has the problem of shrinkage cavity. Figure 1 As shown in the figure, the battery pack support still has the problem of shrinkage cavity. Due to the uneven distribution of wall thickness and the deep cavity structure, the mould core temperature of the mould is not balanced, which further leads to uneven shrinkage of the metal liquid during cooling and solidification, thereby producing local shrinkage cavity defects in the thick wall of the battery pack support. The shrinkage cavity defects can reduce the mechanical strength and durability of the battery pack support, and affect the safety and reliability of the whole vehicle. Therefore, an improved mould design is needed to more effectively solve the shrinkage cavity problem of the battery pack support in the extrusion casting process and improve the product quality. SUMMARY

[0005] The utility model wants to solve the technical problem to provide a kind of mould for extrusion casting battery pack support, it is increased by inlay piece type water core structure in the region of the L type thick wall of battery pack support in movable mould core, accelerates the cooling speed of the local area of movable mould core, reaches mould core mould temperature balance, reduces the shrinkage cavity defect in the L type thick wall of battery pack support.

[0006] The utility model adopts the technical scheme to solve the above technical problem: a kind of mould for extrusion casting battery pack support, the mould includes movable mould core and fixed mould core, flow channel and cavity being communicated with the flow channel are arranged between the movable mould core and the fixed mould core, characterized in that: the cavity includes two independent and left-right symmetrical distribution sub-cavities, each sub-cavity is used to extrusion cast one battery pack support, each sub-cavity is enclosed by movable mould side cavity body and fixed mould side cavity body, the movable mould side cavity body is designed to be suitable for the shape of the deep cavity structure side of one battery pack support to be extrusion cast, water core structure is arranged in the movable mould core close to the L type thick wall of battery pack support to be extrusion cast.

[0007] The water core structure includes metal body and U-shaped water flow channel arranged in the metal body, two water inlets of the U-shaped water flow channel are located on the same side end surface of the metal body, and the two water inlets of the U-shaped water flow channel are exposed on the back surface of the movable mould core after the water core structure is installed in the movable mould core. Here, the outer end of the metal body is welded to the back surface of the movable mould core; the U-shaped water flow channel can more accurately control the flow of the cooling liquid, thereby more uniformly cooling the corresponding position of the movable mould core, accelerating the solidification of the metal liquid and reducing the local shrinkage cavity defect of the L type thick wall of the battery pack support.

[0008] Two water core structures are provided in the movable mould core for one battery pack support, one of the water core structures is close to the vertical wall of the L type thick wall of the battery pack support, and the center line of the two water inlets of the U-shaped water flow channel is parallel to the vertical wall, and the other water core structure is close to the horizontal wall of the L type thick wall of the battery pack support, and the center line of the two water inlets of the U-shaped water flow channel is parallel to the horizontal wall. In this structure, the two water core structures can be used to cool the vertical wall and the horizontal wall of the L type thick wall, more effectively control the cooling of the thick wall part, and reduce the shrinkage cavity defect; the design of the center line of the two water inlets of the U-shaped water flow channel being parallel to the wall optimizes the flow path of the cooling liquid, making the cooling more uniform and effective.

[0009] The two water core structures arranged for the battery pack support are designed to cover the L-shaped thick wall of the battery pack support, and the cooling range of the two water core structures is designed to cover the L-shaped thick wall of the battery pack support. In this structure, the whole area of the L-shaped thick wall of the battery pack support can be effectively cooled, thereby reducing the shrinkage hole defects in the whole thick wall area; the cooling range radius of each water core structure is 30 mm, and the positions of the two water core structures can be designed according to the cooling range, so that the whole area of the L-shaped thick wall can be effectively cooled.

[0010] The mold also comprises a runner cooling system, and the distance between the runner cooling system and the transverse wall of the L-shaped thick wall of the battery pack support is less than the cooling range radius of the runner cooling system. In particular, the runner cooling system is arranged at a distance of 20-25 mm from the transverse wall of the L-shaped thick wall of the battery pack support. If the runner cooling system is arranged at the position corresponding to the material inlet of the main runner of the runner, the heat near the battery pack support in the runner cannot be taken away, and the heat will enter the cavity, causing the shrinkage hole in the L-shaped thick wall of the battery pack support to become larger. Therefore, the runner cooling system is arranged at a position where the distance between the runner cooling system and the transverse wall of the L-shaped thick wall of the battery pack support is less than the cooling range radius of the runner cooling system, so that the heat in the runner can be effectively taken away, the heat entering the cavity in the runner is reduced, and the problem of the shrinkage hole in the L-shaped thick wall becoming larger is reduced.

[0011] The runner cooling system comprises a movable mold side cooling water channel arranged in the movable mold core and a fixed mold side cooling water channel arranged in the fixed mold core, and the cooling paths of the movable mold side cooling water channel and the fixed mold side cooling water channel are circumferential paths covering the runner. In this structure, the movable mold side cooling water channel and the fixed mold side cooling water channel are used to cool the runner in all directions, thereby effectively reducing the heat entering the cavity.

[0012] The movable mold side cooling water channel comprises two double-L-shaped stepped water channels symmetrically distributed left and right, two water outlets of the double-L-shaped stepped water channels are respectively used as a movable mold side water inlet and a movable mold side water outlet, one water outlet of each double-L-shaped stepped water channel is arranged on the two side surfaces of the movable mold core, and the other water outlet of each double-L-shaped stepped water channel is arranged on the back surface of the movable mold core. The movable mold side cooling water channel has the advantages that the movable mold side cooling water channel can simultaneously realize side cooling of the runner, and the runner can be uniformly cooled in all directions.

[0013] The fixed mold side cooling water channel comprises two U-shaped water channels symmetrically distributed left and right, two water outlets of each U-shaped water channel are respectively used as a fixed mold side water inlet and a fixed mold side water outlet, two water outlets of one U-shaped water channel are arranged on the same side surface of the fixed mold core, and two water outlets of the other U-shaped water channel are arranged on the other side surface of the fixed mold core.

[0014] Compared with the prior art, the utility model has the advantages that

[0015] By setting the water core structure in the movable mold core, the metal liquid solidification speed of the L-shaped thick wall part of the battery pack support can be accelerated, thereby reducing the mold core mold temperature imbalance problem caused by uneven wall thickness and deep cavity structure, and further reducing the generation of local shrinkage defects. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic view of the front structure of the battery pack support;

[0017] Figure 2 It is a schematic view of the overall structure of the mold of the utility model;

[0018] Figure 3 It is a schematic view of the local structure (after removing the structure outside the movable mold frame) of the mold of the utility model;

[0019] Figure 4 It is a schematic view of the front structure of the movable mold core in the mold of the utility model; Figure 3

[0020] Figure 5 It is a schematic view of the back structure of the movable mold core in the mold of the utility model;

[0021] Figure 6 It is a schematic view of the back structure of the movable mold core in the mold of the utility model;

[0022] Figure 7 It is a side view of the movable mold core in the mold of the utility model;

[0023] Figure 8 It is a schematic view of the A-A cross section of the movable mold core in the mold of the utility model; Figure 7

[0024] It is a schematic view of the B-B cross section of the movable mold core in the mold of the utility model; Figure 9 Figure 7 It is a schematic view of the overall structure of the movable mold core and the movable mold frame in the mold of the utility model;

[0025] Figure 10 It is a layout schematic view of the movable mold side cooling water path in the simulation structure of the flow channel and the flow channel cooling system of the battery pack support, water core structure and flow channel simulation structure;

[0026] Figure 11 It is a schematic view of the position of the water core structure and the battery pack support;

[0027] Figure 12 It is a schematic view of the position of the simulation structure of the flow channel and the simulation structure of the flow channel cooling system;

[0028] Figure 13

[0029] Figure 14 ​​​This is a schematic diagram of the simulated structure of the battery pack support and flow channel. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] In some pure electric vehicles, the battery pack bracket A typically consists of two symmetrical brackets, left and right. During extrusion casting, both symmetrical battery pack brackets A are extruded together. During extrusion casting, the cavity corresponding to the thicker wall of the battery pack bracket A on the moving mold core contains more molten metal, while the cavity corresponding to the thinner wall contains less molten metal. Areas with less molten metal experience less heat, faster heat dissipation, and faster solidification, while areas with more molten metal experience more heat, slower heat dissipation, and slower solidification. This results in localized shrinkage cavities in the thicker wall of the battery pack bracket A.

[0032] To address the shrinkage cavity defect in the L-shaped thick-walled A1 of the battery pack bracket A, this invention proposes a mold for extruding and casting the battery pack bracket, such as... Figures 2-14 As shown, the mold includes a moving mold frame 1, a moving mold core 2, a fixed mold core 3, and a fixed mold frame 4 arranged sequentially. A sprue sleeve 5 is provided between the moving mold frame 1 and the fixed mold frame 4. A runner 6 and a cavity connected to the runner 6 are provided between the moving mold core 2 and the fixed mold core 3. The inlet of the runner 6 is directly connected to the sprue sleeve 5. The cavity includes two independent and symmetrically distributed sub-cavities 7. Each sub-cavity 7 is used for extrusion casting a battery pack bracket A. Each sub-cavity 7 is enclosed by a moving mold side cavity 71 and a fixed mold side cavity (not shown in the figure). Figure 5 Only the moving mold side cavity 71 is shown. The moving mold side cavity 71 is designed to fit the shape of the deep cavity structure of a battery pack bracket A to be extruded and cast. A water core structure 8 is provided in the moving mold core 2 near the L-shaped thick wall A1 of the battery pack bracket A to be extruded and cast. By providing the water core structure 8 in the moving mold core 2, the solidification speed of the molten metal in the L-shaped thick wall A1 of the battery pack bracket A can be accelerated, thereby reducing the problem of mold core temperature imbalance caused by uneven wall thickness and deep cavity structure, and thus reducing the generation of local shrinkage defects.

[0033] Further defining the coolant core structure 8, it includes a metal body 81 and a U-shaped water channel 82 disposed within the metal body 81. The two water inlets of the U-shaped water channel 82 are located on the same end face of the metal body 81. After the coolant core structure 8 is installed inside the moving mold core 2, the two water inlets of the U-shaped water channel 82 are exposed on the back side of the moving mold core 2. Here, the outer end of the metal body 81 is welded to the back side of the moving mold core 2. The U-shaped water channel 82 can more precisely control the flow of coolant, thereby cooling the corresponding position of the moving mold core 2 more evenly, accelerating the solidification of the molten metal, and reducing local shrinkage defects in the L-shaped thick-walled A1 of the battery pack bracket A.

[0034] As preferred, two water core structures 8 are arranged in the movable mold core 2 for one battery pack support A, one of the water core structures 8 is close to the vertical wall A11 of the L-shaped thick wall A1 of the battery pack support A, and the center line of the two water outlets of the U-shaped water flow channel 82 is parallel to the vertical wall A11, and the other water core structure 8 is close to the horizontal wall A12 of the L-shaped thick wall A1 of the battery pack support A, and the center line of the two water outlets of the U-shaped water flow channel 82 is parallel to the horizontal wall A12. In this structure, the two water core structures 8 can be used to cool the vertical wall A11 and the horizontal wall A12 of the L-shaped thick wall A1, more effectively control the cooling of the thick wall part, and reduce the shrinkage hole defects; the design that the center line of the two water outlets of the U-shaped water flow channel 82 is parallel to the wall optimizes the flow path of the cooling liquid, so that the cooling is more uniform and effective.

[0035] As preferred, the positions of the two water core structures 8 arranged for one battery pack support A are designed such that the total cooling range of the two water core structures 8 covers the L-shaped thick wall A1 of the battery pack support A. In this structure, the entire area of the L-shaped thick wall A1 of the battery pack support A is effectively cooled, thereby reducing the shrinkage hole defects in the entire thick wall area; the cooling range radius of each water core structure 8 is 30 mm, and the positions of the two water core structures 8 can be designed according to the cooling range, so as to ensure that the entire area of the L-shaped thick wall A1 is effectively cooled.

[0036] The flow channel 6 adopts the prior art, specifically, the flow channel 6 includes a main flow channel 61, two branch flow channels 62 and two inner pouring flow channels 63, the two branch flow channels 62 are symmetrically arranged on both sides of the width direction of the main flow channel 61, the outer side of each branch flow channel 62 in the width direction is in an outward convex R-angle structure, the connection between each branch flow channel 62 and the main flow channel 61 is smoothly and naturally transitioned, the two inner pouring flow channels 63 are correspondingly arranged on the top of the two branch flow channels 62, the inner side of each inner pouring flow channel 63 in the width direction is in an outward convex R-angle structure, the main flow channel 61, the branch flow channel 62 and the inner pouring flow channel 63 are sequentially communicated to form a Y-shaped flow channel structure, the thickness of the main flow channel 61 is greater than the thickness of the branch flow channel 62, the size of the inner pouring port 64 of the inner pouring flow channel 63 is slightly smaller than the size of the cross section of the branch flow channel 62, and the inner pouring port 64 of the two inner pouring flow channels 63 is communicated with the two sub cavities 7 one by one.

[0037] Further, the mold further comprises a runner cooling system 9, the distance between the runner cooling system 9 and the transverse wall A12 of the L-shaped thick wall A1 of the battery pack support A is less than the cooling range radius of the runner cooling system 9, and in particular, the runner cooling system 9 is arranged at a distance of about 20-25 mm from the transverse wall A12 of the L-shaped thick wall A1 of the battery pack support A, and the cooling range radius of the runner cooling system 9 is 30 mm. If the runner cooling system 9 is arranged at the position corresponding to the inlet of the main runner 61 of the runner 6, the heat near the battery pack support A in the runner 6 cannot be taken away, and the heat will enter the cavity, causing the shrinkage hole in the L-shaped thick wall A1 of the battery pack support A to become larger. The runner cooling system 9 is arranged at a position where the distance between the runner cooling system 9 and the transverse wall A12 of the L-shaped thick wall A1 of the battery pack support A is less than the cooling range radius of the runner cooling system 9, so that the heat in the runner can be effectively taken away, the heat entering the cavity in the runner is reduced, and the problem of the shrinkage hole in the L-shaped thick wall A1 becoming larger is reduced.

[0038] Further limited, the runner cooling system 9 is composed of a movable mold side cooling water channel 91 arranged in the movable mold core 2 and a fixed mold side cooling water channel 92 arranged in the fixed mold core 3, and the cooling path of the movable mold side cooling water channel 91 and the fixed mold side cooling water channel 92 is the circumferential direction of the runner 6. In this structure, the movable mold side cooling water channel 91 and the fixed mold side cooling water channel 92 are used to cool the runner 6 in all directions, effectively reducing the heat entering the cavity.

[0039] As a preferred, the movable mold side cooling water channel 91 comprises two double-L-shaped stepped water channels 911 symmetrically distributed left and right, two water outlets of the double-L-shaped stepped water channels 911 are respectively used as the movable mold side water inlet and the movable mold side water outlet, one of the two double-L-shaped stepped water channels 911 is respectively arranged on the two side surfaces of the movable mold core 2, and the other of the two double-L-shaped stepped water channels 911 is respectively arranged on the back surface of the movable mold core 2. The movable mold side cooling water channel 91 with this structure can simultaneously realize the side cooling of the runner 6, so that the runner 6 is uniformly cooled in all directions; the fixed mold side cooling water channel 92 comprises two U-shaped water channels 921 symmetrically distributed left and right, two water outlets of the U-shaped water channels 921 are respectively used as the fixed mold side water inlet and the fixed mold side water outlet, two water outlets of one of the U-shaped water channels 921 are arranged on the same side surface of the fixed mold core 3, and two water outlets of the other of the U-shaped water channels 921 are arranged on the other side surface of the fixed mold core 3.

[0040] The mold core mold temperature in the process of extrusion casting the battery pack support using the mold is illustrated by experiments.

[0041] In the process of extrusion casting battery pack support using the mold without water core structure, the temperature in the L-shaped thick wall area of the battery pack support corresponding to the cavity reaches above 260 DEG C, the temperature near the runner position close to the cavity is close to 300 DEG C, the mold core temperature is overheated, and a longer cooling time is needed, resulting in a long production cycle. In the process of extrusion casting battery pack support using the mold of the utility model, the temperature in the L-shaped thick wall area of the battery pack support corresponding to the cavity is below 180 DEG C, the temperature near the runner position close to the cavity can be reduced to about 200 DEG C, and the amount of cooling liquid in the water core structure needs to be controlled in actual production to avoid overcooling of the mold core. It can be found that the mold of the utility model can effectively reduce the temperature in the L-shaped thick wall area of the battery pack support corresponding to the cavity and the temperature near the runner position close to the cavity by setting the water core structure and the runner cooling system, thereby effectively solving the shrinkage hole defect in the L-shaped thick wall of the battery pack support.

Claims

1. A mold for squeeze casting a battery pack bracket, the mold comprising a movable mold core and a stationary mold core, a runner being provided between the movable mold core and the stationary mold core, and a cavity being provided in communication with the runner, characterized in that: The cavity comprises two independent and left-right symmetrical sub-cavities, each of which is enclosed by a cavity body on the side of the movable die and a cavity body on the side of the fixed die, the cavity body on the side of the movable die is designed to be suitable for the shape of the deep cavity structure of a battery pack support to be extrusion cast, and a water core structure is arranged in the movable die core near the L-shaped thick wall of the battery pack support to be extrusion cast.

2. A mold for squeeze casting a battery pack bracket according to claim 1, characterized by: The water core structure comprises a metal body and a U-shaped water flow channel arranged in the metal body, two water outlets of the U-shaped water flow channel are located on the same side end face of the metal body, and after the water core structure is installed in the movable die core, the two water outlets of the U-shaped water flow channel are exposed on the back face of the movable die core.

3. A mold for squeeze casting a battery pack bracket according to claim 2, characterized by: Two water core structures are arranged in the movable die core for one battery pack support, one of the water core structures is arranged near the vertical wall of the L-shaped thick wall of the battery pack support, and the center line of the two water outlets of the U-shaped water flow channel is parallel to the vertical wall, and the other water core structure is arranged near the horizontal wall of the L-shaped thick wall of the battery pack support, and the center line of the two water outlets of the U-shaped water flow channel is parallel to the horizontal wall.

4. A mold for squeeze casting a battery pack bracket according to claim 3, characterized by: The positions of the two water core structures arranged for one battery pack support relative to the L-shaped thick wall of the battery pack support are designed such that the total cooling range of the two water core structures covers the L-shaped thick wall of the battery pack support.

5. The mold for extrusion casting a battery pack bracket according to claim 1, characterized by: The mold further comprises a flow channel cooling system, the distance between the arrangement position of the flow channel cooling system and the horizontal wall of the L-shaped thick wall of the battery pack support is less than the cooling range radius of the flow channel cooling system.

6. A mold for squeeze casting a battery pack bracket according to claim 5, characterized by: The flow channel cooling system comprises a movable die side cooling water channel arranged in the movable die core and a fixed die side cooling water channel arranged in the fixed die core, and the cooling paths of the movable die side cooling water channel and the fixed die side cooling water channel are circumferential paths covering the flow channel.

7. A mold for squeeze casting a battery pack bracket according to claim 6, characterized by: The movable die side cooling water channel comprises two left-right symmetrical double-L-shaped stepped water channels, two water outlets of each double-L-shaped stepped water channel are respectively used as a movable die side water inlet and a movable die side water outlet, one water outlet of each double-L-shaped stepped water channel is located on the side face of the movable die core, and the other water outlet of each double-L-shaped stepped water channel is located on the back face of the movable die core.

8. A mold for squeeze casting a battery pack bracket according to claim 6, characterized by: The fixed die side cooling water channel comprises two left-right symmetrical U-shaped water channels, two water outlets of each U-shaped water channel are respectively used as a fixed die side water inlet and a fixed die side water outlet, two water outlets of one U-shaped water channel are located on the same side face of the fixed die core, and two water outlets of the other U-shaped water channel are located on the other side face of the fixed die core.

Images