A vertical bent busbar casting mold and method

Abstract

The present application relates to the field of forming and casting technology, and particularly relates to a vertical bent-through busbar pouring mold and method, comprising a mold body, the mold body is composed of a first runner arm and a second runner arm, the first runner arm and the second runner arm are communicated and the cavity opening of the two is towards the same side; wherein, the cavity opening A of the second runner arm is completely covered by the cavity opening B of the first runner arm in the projection direction perpendicular to the cavity opening plane, and the plane of the cavity opening B is not lower than the plane of the bottom of the cavity of the first runner arm. The first runner arm of the L-shaped mold is set as the main heat dissipation surface, the second runner arm is set as the auxiliary heat dissipation area, and the design of the asymmetric thermal gradient is matched, so that the uniformization of the cooling process can be realized, the shrinkage hole problem caused by uneven cooling is solved, and the one-time pouring is completed, and the secondary pouring is avoided.

Description

Technical Field

[0001] This invention relates to the field of molding and casting technology, and in particular to a casting mold and method for a vertically bent busbar. Background Technology

[0002] A vertical bend busbar is an L-shaped insulated conductive component used in high-voltage power equipment. It consists of a metal conductor covered with an insulating material. Its core feature is a 90° vertical bend structure, which enables efficient redirection and transmission of electrical energy in compact spaces such as substations.

[0003] Existing casting molds generally adopt a split L-shaped structure, with the two sides assembled by bolts. The joint gap is ≥0.2mm, requiring the process to be performed in two stages: after the first pour of the second runner arm, it needs to cure for more than 30 minutes before the second pour. This intermittent operation leads to material interface delamination, with a bubble rate as high as 2% to 3% at the interface. In addition, the symmetrical design of traditional molds (1:1 ratio) causes strong turbulence in the mixed material at right-angle bends, increasing the bubble retention rate by more than 40%. To alleviate these defects, the industry has tried applying sealant to the joints, but this introduces impurities and reduces insulation strength by 15% to 20%; or adding defoamers, which increases costs by 30% and reduces dielectric properties. While relying on external vibration tables for venting (frequency 20-50Hz) can reduce some bubbles, it results in a finished product dimensional deviation rate >5%. According to the IEC 60426:2007 standard, the tolerance threshold for air bubbles in insulation busbars is 1.5%. However, the pass rate of the existing multi-stage casting process is only 78% to 82%, and the rework cost accounts for 12% to 18% of the total production cost, which has become a key bottleneck restricting the reliability and mass production efficiency of high-voltage equipment. Summary of the Invention

[0004] In this section, as well as in the abstract and title of this application, some simplifications or omissions may be made to avoid obscuring the purpose of this section, the abstract, and the title of this application, and such simplifications or omissions shall not be used to limit the scope of the invention.

[0005] To address the shortcomings of existing technologies, one objective of this invention is to provide a casting mold for a vertically bent busbar.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a vertical bend busbar casting mold, comprising, The mold body is composed of a first flow channel arm and a second flow channel arm, which are connected and the openings of their cavities face the same side.

[0007] Wherein, the cavity opening A of the second flow channel arm is completely covered by the cavity opening B of the first flow channel arm in the projection direction perpendicular to the cavity opening plane, and the plane where the cavity opening B is located is not lower than the plane where the bottom of the cavity of the first flow channel arm is located.

[0008] As a preferred embodiment of the vertical bend busbar casting mold of the present invention, the first flow channel arm and the second flow channel arm are both composed of cuboids, the cavity opening of the first flow channel arm is located on its side wall, and the cavity opening of the second flow channel arm is located at its end.

[0009] As a preferred embodiment of the vertical bend busbar casting mold of the present invention, the mold cavity is an integrally formed L-shape, and the ratio between the length M1 of the second runner arm and the length M2 of the first runner arm is 1 / 4 to 1 / 3.

[0010] As a preferred embodiment of the vertical bend busbar casting mold of the present invention, wherein: an arc segment is provided at the connection between the first flow channel arm and the second flow channel arm, and the radius of curvature R of the arc segment satisfies: K=R / M1, and the value of K is in the range of 0.5~1.

[0011] As a preferred embodiment of the vertical bend busbar casting mold of the present invention, the first flow channel arm includes a fixed sealing plate, a side plate and a bottom plate, the side plate is provided with two sets respectively disposed on both sides of the bottom plate, and the fixed sealing plate is placed on the bottom plate.

[0012] As a preferred embodiment of the vertical bend busbar casting mold of the present invention, the second flow channel arm includes a rear sealing plate, a crossbeam, a hanger, and a clamp. The rear sealing plate is disposed on one side of the side plate, the crossbeam is disposed on two sets of the side plates, the rear sealing plate is disposed on the crossbeam by the hanger, and the clamp is disposed at one end of the second flow channel arm.

[0013] As a preferred embodiment of the vertical bend busbar casting mold of the present invention, the casting position of the mold body is located at the intersection of the cavity openings of the first flow channel arm and the second flow channel arm.

[0014] Another objective of this invention is to provide a method for casting vertically bent busbars. To achieve the above objective, this invention provides the following technical solution: As a preferred embodiment of the vertical bend busbar casting method of the present invention, it includes the following steps: A release agent is sprayed onto the inner wall of the mold cavity to form a release film with a thickness of no more than 0.1 mm.

[0015] The mixed epoxy resin material is injected into the mold cavity in one go through the opening of the second runner arm using an injection molding machine at a rate of 10 cm³ / s to 15 cm³ / s.

[0016] As the injected mixture flows through the arc-shaped section, it creates vortices that cause bubbles to detach from the inner wall of the flow channel. The detached bubbles rise along the inner wall within the first flow channel arm and are eventually discharged from the exhaust port.

[0017] After the material is injected, active cooling is activated for the first flow channel arm, so that the cooling rate at the end of the first flow channel arm is higher than that in the second flow channel arm region, forming a temperature gradient of 20°C to 25°C, which promotes the sequential solidification of the mixed material from the second flow channel arm to the end of the first flow channel arm.

[0018] As a preferred embodiment of the vertical bend busbar casting method of the present invention, the injection machine is a precision metering screw injection machine with an injection pressure of 0.5MPa~1.0MPa.

[0019] As a preferred embodiment of the vertical bend busbar casting method of the present invention, the finished product is ejected by a demolding mechanism along the same side as the opening of the runner port, the ejection speed is 5mm / s~10mm / s, and the maximum ejection force is not greater than 50kN.

[0020] One beneficial effect of the present invention is that by setting the first runner arm of the L-shaped mold as the main heat dissipation surface and the second runner arm as the auxiliary heat dissipation area, and with the design of an asymmetric thermal gradient, the cooling process can be made uniform, which solves the problem of shrinkage caused by uneven cooling, and at the same time, it can be poured in one go, avoiding secondary pouring. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the mold assembly when the copper busbar is not installed in the vertical bend busbar casting mold of the present invention.

[0023] Figure 2 This is a schematic diagram of the casting mold for the vertical bend busbar of the present invention at points A and B.

[0024] Figure 3 This is a schematic diagram of the interior of the mold when installing the copper busbar in the vertical bend busbar casting mold of the present invention.

[0025] Figure 4 This is a front view of the casting mold for the vertical bend busbar of the present invention.

[0026] Figure 5 This is a schematic diagram showing the flow direction of the casting material for the vertical bend busbar of the present invention.

[0027] Figure 6 This is a right view of the casting mold for the vertical bend busbar of the present invention.

[0028] Figure 7 This is a top view of the casting mold for the vertical bend busbar of the present invention. Detailed Implementation

[0029] To make the objectives, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0032] Example 1

[0033] Reference Figures 1 to 7 This is the first embodiment of the present invention. This embodiment provides a vertical bend busbar casting mold, which can improve the quality of busbar casting products and optimize their production efficiency. It includes: a mold body 100, which is composed of a first runner arm 101 and a second runner arm 102. The first runner arm 101 and the second runner arm 102 are connected and their cavity openings face the same side.

[0034] Wherein, the cavity opening A of the second flow channel arm 102 is completely covered by the cavity opening B of the first flow channel arm 101 in the projection direction perpendicular to the cavity opening plane, and the plane where the cavity opening B is located is not lower than the plane where the bottom of the cavity of the first flow channel arm 101 is located.

[0035] The unidirectional opening design allows resin to be injected from a single direction, enabling complete pouring in one go and avoiding secondary pouring, thus reducing operation time by 50%.

[0036] Furthermore, both the first flow channel arm 101 and the second flow channel arm 102 are constructed of cuboids, with the cavity opening of the first flow channel arm 101 located on its sidewall and the cavity opening of the second flow channel arm 102 located at its end.

[0037] Furthermore, the mold cavity 100a is an integrally formed L-shape, and the ratio between the length M1 of the second runner arm 102 and the length M2 of the first runner arm 101 is 1 / 4 to 1 / 3.

[0038] The length of the second flow channel arm 102 is 1 / 3 to 1 / 4 of the length of the first flow channel arm 101. Limiting the short side length to 1 / 3 to 1 / 4 of the first flow channel arm 101 is to address the core contradiction between resin flowability and structural reliability in L-shaped casting. If the short side is too long (>1 / 3 of the long side), the resin flowing from the first flow channel arm 101 into the second flow channel arm 102 via the common sidewall M experiences kinetic energy attenuation due to the increased flow distance, making the short side prone to insufficient filling and cavitation. If the short side is too short (<1 / 4 of the long side), turbulence is generated when the resin flows into the short side, entraining air bubbles. Furthermore, the small volume of the short side will prematurely solidify and block the common flow channel, hindering the venting of the first flow channel arm 101. The ratio of 1 / 3 to 1 / 4 was verified through fluid simulation and experiments to ensure that the resin is in a laminar flow state with a Reynolds number Re < 2300. The flow rate at the end of the short side is maintained by hydraulic pressure to keep the first flow channel arm 101 at 35% to 50%. At the same time, the heat release of the first flow channel arm 101 during curing is matched so that the volume of the short side is 1 / 9 to 1 / 16 of the long side, so that the temperature difference between the two sections is < 10℃. This avoids thermal stress cracking at the common sidewall M, and ultimately achieves a single pour without delamination and a bubble rate of ≤ 0.1%.

[0039] Assuming the length of the first runner arm 101 is set to 600mm, the length of the second runner arm 102 is controlled to be 200mm, a ratio of 1:3. The mold cavity 100 is composed of the mutually perpendicular first runner arm 101 and second runner arm 102. The cavity openings of the first runner arm 101 and the second runner arm 102 both face the same operating direction, facilitating material filling, molding operations, and subsequent product removal. The first runner arm 101 and the second runner arm 102 are connected by a common sidewall M, forming an integrated molding space, ensuring smooth material flow between the two sides during the molding process. Specifically, the length of the second runner arm 102 is set between 1 / 3 and 1 / 4 of the length of the first runner arm 101. This size ratio design allows the mold cavity 100 to meet molding requirements while optimizing space utilization and improving molding efficiency. The relatively short design of the second runner arm 102 can reduce the overall size of the mold to a certain extent, while ensuring that the second runner arm 102 can meet its functional requirements during the molding process, such as providing sufficient support.

[0040] Specifically, the top opening of the second runner arm 102 serves as the sprue A, and the top opening of the first runner arm 101 serves as the vent B. The two sections are connected by a common sidewall M. Resin enters the mold cavity 100 from the sprue A and then spreads towards the first runner arm 101 under gravity. Simultaneously, gas naturally escapes from the vent B of the first runner arm 101. The length of the shorter side is strictly limited to 1 / 3 to 1 / 4 of the longer side, such as an 800mm longer side paired with a 200 to 267mm shorter side, ensuring that the resin pressure at the sprue A (0.2 to 0.3 MPa) and the negative pressure at the vent B (-0.05 MPa) form a directional flow field. The diameter of the vent B is 1.5 times that of the sprue A, for example: sprue A Φ40mm / vent B Φ60mm, to avoid gas stagnation.

[0041] Furthermore, the common sidewall M is the vertical structure of the end sidewall of the first flow channel arm 101 and the long sidewall of the second flow channel arm 102, and its top is flush with the top surface of the mold.

[0042] Furthermore, an arc-shaped segment 103 is provided at the connection between the first flow channel arm 101 and the second flow channel arm 102. The radius of curvature R of the arc-shaped segment 103 satisfies: K=R / M1, and the value of K ranges from 0.5 to 1.

[0043] The connection between the first flow channel arm 101 (600mm long) and the second flow channel arm 102 (200mm long) features an arc-shaped segment 103 with a curvature radius R = 150mm, calculated as the shorter side length × 0.75. During operation, resin is injected from the pouring port A of the second flow channel arm 102 and naturally flows along the arc-shaped segment 103 towards the first flow channel arm 101. This curvature design balances centrifugal force and viscous resistance as the resin flows through the bend, controlling the shear rate to 120–150 s. This prevents resin separation and filler deposition due to sharp bends (R < 100mm) or flow instability and eddy currents due to gentle bends (R > 200mm). Simultaneously, this arc curvature matches the minimum bending radius of the L-shaped busbar conductor. When the conductor thickness is 20mm, R ≥ 7.5 times the thickness is required. After curing, the inner insulation layer of the bend shows no tensile cracks, and the outer layer shows no compression wrinkles. Furthermore, the reduced flow channel resistance lowers the bubble rate and improves casting efficiency.

[0044] Furthermore, the first flow channel arm 101 includes a fixed sealing plate 101a, a side plate 101b, and a bottom plate 101c. The side plate 101b is provided with two sets respectively disposed on both sides of the bottom plate 101c, and the fixed sealing plate 101a is placed on the bottom plate 101c.

[0045] Furthermore, the second flow channel arm 102 includes a rear sealing plate 102a, a crossbeam 102b, a lifting rod 102c, and a clamp 102d. The rear sealing plate 102a is disposed on one side of the side plate 101b, the crossbeam 102b is disposed on the two sets of side plates 101b, the rear sealing plate 102a is mounted on the crossbeam 102b via the lifting rod 102c, and the clamp 102d is disposed at one end of the second flow channel arm 102.

[0046] The copper busbar and the fixed sealing plate 101a are placed in the mold cavity 100. The rear sealing plate 102a is suspended by the hanger rod 102c on the crossbeam 102b. The width of one end of the second runner arm 102 can be adjusted by adjusting the thread. Finally, the clamp 102d makes the rear sealing plate 102a, the side plate 101b and the bottom plate 101c tightly connected to prevent the casting material from leaking.

[0047] The casting position of the first mold body 100 is located at the intersection of the cavity openings of the first runner arm 101 and the second runner arm 102.

[0048] Example 2

[0049] This is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a busbar casting method, including spraying a release agent onto the inner wall of the mold cavity 100a to form a release film with a thickness not exceeding 0.1 mm. (Refer to...) Figure 5 The direction of the arrow in the bar line corresponding to ① is that the mixed epoxy resin material is injected into the mold cavity 100a in one go through the opening of the second runner arm 102 at a rate of 10 cm³ / s ~ 15 cm³ / s using an injection molding machine.

[0050] The solid arrow corresponding to ② in the figure indicates that after the injected mixed material reaches the bottom of the mold cavity 100a, the mixed epoxy resin material gradually increases in the second flow channel arm 102 as the mixed epoxy resin material is poured.

[0051] Furthermore, as the flow direction of point ③ in the figure passes through the arc segment 103, a vortex is formed, causing the bubbles to detach from the inner wall of the flow channel. The detached bubbles rise along the inner wall within the first flow channel arm 101 and are eventually discharged from the exhaust port.

[0052] After the material is injected, active cooling is activated for the first flow channel arm 101, so that the cooling rate at the end of the first flow channel arm 101 is higher than that in the second flow channel arm 102 region, forming a temperature gradient of 20°C to 25°C, which promotes the sequential solidification of the mixed material from the second flow channel arm 102 toward the end of the first flow channel arm 101.

[0053] Furthermore, the injection machine is a precision metering screw injection machine with an injection pressure of 0.5MPa~1.0MPa.

[0054] The screw-type structure provides a continuous and stable shear flow, unlike the pulsating flow that may occur with piston-type injection. This flow pattern effectively prevents air entrapment during melt transport and ensures material uniformity. Furthermore, the injection pressure of 0.5MPa~1.0MPa ensures sufficient power to overcome the flow resistance of the mixed material in the L-shaped runner, especially the arc section 103, achieving rapid and complete filling and avoiding "cold shut" defects caused by insufficient filling. Simultaneously, it prevents excessive pressure from causing the mixed material to enter the mold cavity in a "jet" or "spray" state, generating severe turbulence and entraining a large number of air bubbles. This balances the contradiction between filling efficiency and flow stability. Within this pressure range, the material can advance forward in a stable "spreading flow," smoothly filling the entire mold cavity.

[0055] Furthermore, the finished product is ejected via a demolding mechanism along the same side as the runner opening, with an ejection speed of 5mm / s to 10mm / s and a maximum ejection force of no more than 50kN. The ejection force is primarily applied to the area at the end of the first runner arm 101, specifically the straight section of the finished product furthest from the L-shaped corner and with the highest strength. This area has a simple structure and is a non-critical stress area; ejecting here avoids scratches, deformation, or internal cracks in complex stress concentration areas such as the L-shaped corner.

[0056] Furthermore, the ejection speed is 5mm / s to 10mm / s. If the ejection speed is too slow, the huge static friction and clamping force between the finished product and the inner wall of the mold cavity may cause the ejection process to "stick" or even be interrupted. Too slow a speed also causes the finished product to be subjected to local stress for too long, increasing the risk of plastic deformation. If the ejection speed is too fast, it will generate huge instantaneous impact force. Brittle epoxy resin finished products may crack due to impact, especially at corners where the cross-section changes. Moreover, high-speed demolding will cause "stress whitening" on the product surface due to the instantaneous vacuum adsorption effect, which seriously affects the appearance and insulation performance. This speed range can ensure that static friction is overcome and smooth demolding is achieved, while controlling the dynamic impact force below the material yield strength, ensuring the integrity of the finished product's geometric dimensions and surface quality.

[0057] Specifically, if the actual ejection force consistently approaches or exceeds 50kN, it indicates an abnormality in the process, such as mold release agent failure, mold wear, or insufficient cooling leading to excessive clamping force. This parameter can serve as an early warning indicator for the production line, limiting the ejection force within a certain range to prevent serious consequences such as ejector pin bending, mold damage, or finished product crushing caused by abnormal conditions.

[0058] In summary, in this embodiment, before the injection molding material enters the mold cavity 100 from the second runner arm 102, a release agent is sprayed onto the inner surface of the mold to prevent the molded busbar from sticking to the mold, facilitating subsequent demolding. After injection, the molded busbar is ejected from the mold via a demolding mechanism, which can be a mechanical ejection device or a pneumatic demolding device, ensuring that the molded busbar can be removed from the mold intact and without damage. This mold design and molding process not only improves molding efficiency but also ensures product quality and ease of demolding.

[0059] The rest of the structure is the same as in Example 1.

[0060] Working principle: The mold consists of a first runner arm 101 and a second runner arm 102 that are perpendicular to each other. The cavity opening of the second runner arm 102 serves as the sprue A, used to inject the mixed material into the mold cavity 100 in one go, while the cavity opening of the first runner arm 101 serves as the vent B, used to expel gas from the mold cavity 100. After the mixed material is injected into the mold cavity 100 by the injection molding machine, it passes through the arc-shaped section 103 between the second runner arm 102 and the first runner arm 101, forming a vortex. Air bubbles rise along the inner wall of the first runner arm 101 to the vent B and are discharged, ensuring that no air bubbles remain during the molding process. After casting is completed, the molded generatrix is ​​ejected from the mold through the demolding mechanism.

[0061] During the molding process, the first runner arm 101 and the second runner arm 102 of the L-shaped mold perform different heat dissipation and cooling functions, respectively. The first runner arm 101 provides the main heat dissipation surface. Due to its large surface area and distance from the gate A, it cools faster and solidifies first. The second runner arm 102 serves as an auxiliary heat dissipation area. Although it is smaller in size and has concentrated heat, its connection to the first runner arm 101 allows for rapid heat transfer, preventing localized overheating. This asymmetric thermal gradient design makes the cooling process more uniform and reduces defects caused by uneven cooling.

[0062] Furthermore, this design forces the material to solidify directionally from the short side (high-temperature zone) to the long side (low-temperature zone) through a structural layout with long and short sides. This directional solidification method causes shrinkage cavities to concentrate at the ends of the long sides, rather than in critical structural areas. Shrinkage cavities at the ends of the long sides can be repaired through subsequent processing without affecting the overall performance and structural integrity of the product. This design not only improves product quality but also optimizes production efficiency.

[0063] In summary, by setting the first runner arm 101 of the L-shaped mold as the main heat dissipation surface and the second runner arm 102 as the auxiliary heat dissipation area, and with the design of an asymmetric thermal gradient, the cooling process can be made uniform, solving the problem of shrinkage caused by uneven cooling, while also allowing for one-time casting, avoiding secondary casting, and reducing the operation time by 50%.

[0064] Furthermore, by forcing the material to solidify directionally from the short side (high temperature zone) to the long side (low temperature zone), shrinkage cavities can be concentrated at the end of the long side that is easy to process and repair, rather than in critical structural parts, thus solving the problem of shrinkage cavities affecting product performance in critical parts.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A casting mold for a vertically bent busbar, characterized in that: include, The mold body (100) is composed of a first flow channel arm (101) and a second flow channel arm (102), the first flow channel arm (101) and the second flow channel arm (102) are connected and the openings of their cavities face the same side; Wherein, the cavity opening A of the second flow channel arm (102) is completely covered by the cavity opening B of the first flow channel arm (101) in the projection direction perpendicular to the cavity opening plane, and the plane where the cavity opening B is located is not lower than the plane where the bottom of the cavity of the first flow channel arm (101) is located. The cavity (100a) formed by the cavities of the first runner arm (101) and the second runner arm (102) is an integrally formed L-shape. The ratio between the length M1 of the second runner arm (102) and the length M2 of the first runner arm (101) is 1 / 4 to 1 / 3. An arc segment (103) is provided at the corner of the first flow channel arm (101) and the second flow channel arm (102). The radius of curvature R of the arc segment (103) satisfies: K=R / M1, and the value of K is in the range of 0.5~1.

2. The vertical bend busbar casting mold as described in claim 1, characterized in that: The first flow channel arm (101) and the second flow channel arm (102) are both rectangular parallelepipeds. The cavity opening of the first flow channel arm (101) is located on its side wall, and the cavity opening of the second flow channel arm (102) is located at its end.

3. The vertical bend busbar casting mold as described in claim 1 or 2, characterized in that: The first flow channel arm (101) includes a fixed sealing plate (101a), a side plate (101b) and a bottom plate (101c). The side plate (101b) is provided with two sets respectively disposed on both sides of the bottom plate (101c), and the fixed sealing plate (101a) is placed on the bottom plate (101c).

4. The vertical bend busbar casting mold as described in claim 3, characterized in that: The second flow channel arm (102) includes a rear sealing plate (102a), a crossbeam (102b), a lifting rod (102c), and a clamp (102d). The rear sealing plate (102a) is disposed on one side of the side plate (101b), the crossbeam (102b) is disposed on two sets of the side plates (101b), the rear sealing plate (102a) is disposed on the crossbeam (102b) via the lifting rod (102c), and the clamp (102d) is disposed at one end of the second flow channel arm (102).

5. The vertical bend busbar casting mold as described in claim 2 or 4, characterized in that: The casting position of the mold (100) is located at the intersection of the cavity openings of the first runner arm (101) and the second runner arm (102).

6. A busbar casting method, using the vertical bend busbar casting mold as described in claim 1, characterized in that... Includes the following steps: A release agent is sprayed onto the inner wall of the mold cavity (100a) to form a release film with a thickness of no more than 0.1 mm; The mixed epoxy resin material is injected into the mold cavity (100a) in one go through the opening of the second runner arm (102) using an injection molding machine at a rate of 10 cm³ / s ~ 15 cm³ / s; When the injected mixed material flows through the arc section (103), it forms a vortex, causing the bubbles to detach from the inner wall of the flow channel; the detached bubbles rise along the inner wall in the first flow channel arm (101) and are finally discharged from the exhaust port. After the material is injected, active heat dissipation is activated for the first flow channel arm (101), so that the cooling rate at the end of the first flow channel arm (101) is higher than that in the second flow channel arm (102) region, forming a temperature gradient of 20°C to 25°C, which causes the mixed material to solidify sequentially from the second flow channel arm (102) towards the end of the first flow channel arm (101).

7. The busbar casting method as described in claim 6, characterized in that: The injection machine is a precision metering screw injection machine with an injection pressure of 0.5MPa~1.0MPa.

8. The busbar casting method as described in claim 6 or 7, characterized in that: The finished product is ejected by the demolding mechanism along the same side as the opening of the runner port, with an ejection speed of 5mm / s to 10mm / s and a maximum ejection force of no more than 50kN.

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