A die-casting mold for an automotive aluminum alloy control box

Abstract

This invention discloses a die-casting mold for an automotive aluminum alloy control box, relating to the field of pressure casting technology. It includes a cooperating upper mold and lower mold. A sprue is penetrating the center of a punch core, and an oblique hole communicating with the sprue is also provided. A sealing slider with a flat lower surface is slidably installed within the oblique hole. The punch core has multiple receiving cavities surrounding the forming cavity, and piston assemblies are slidably installed within each receiving cavity. Each receiving cavity is connected to the forming cavity via a corresponding connecting groove. The upper mold base has a sliding bracket connected to each piston assembly, a hinged lever, and an elastic drive assembly that can be unlocked to lock the sealing slider. The two ends of the lever are respectively hinged to the sliding bracket and abut against the upper end of the sealing slider. This invention can automatically seal the sprue using filling pressure, resulting in a smooth product surface without sprue residue. Slag packing is automatically separated simultaneously upon mold opening, eliminating the need for subsequent sprue removal and finishing processes, effectively improving production efficiency and reducing manufacturing costs.

Description

Technical Field

[0001] This invention relates to the field of pressure casting technology, and in particular to a die-casting mold for an automotive aluminum alloy control box. Background Technology

[0002] The automotive aluminum alloy control box is a core load-bearing component of the vehicle's electronic control system. It is mostly made of aluminum alloy by pressure casting, which combines structural strength and heat dissipation function. The flatness requirement of the assembly surface where it is attached to electronic components is high.

[0003] In the die-casting process, a gating channel is required within the mold to allow the molten metal to flow. After casting, the sprue material within the channel becomes integrated with the product body. Current processes require a dedicated sprue removal step after die-casting, which not only increases the number of steps and reduces production efficiency, but also results in poor surface smoothness after sprue removal. This makes it impossible to directly meet the precision requirements of the heat dissipation bonding surface of automotive control boxes, necessitating additional milling and other machining processes for smoothing. This significantly increases manufacturing costs, lengthens the overall production cycle, and is ill-suited to the large-scale, low-cost production demands of automotive parts. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a die-casting mold for an automotive aluminum alloy control box.

[0005] To achieve the above objectives, the specific solution of the present invention is as follows: A die-casting mold for an automotive aluminum alloy control box includes an upper mold and a lower mold; The lower mold includes a lower template, a lower mold base disposed on the lower template, and a cavity core disposed on the lower mold base; The upper mold includes an upper template, an upper mold base on the upper template, and a punch core on the upper mold base. A sprue is provided through the center of the punch core. When the punch core and the die core are closed, they form a molding cavity communicating with the sprue. The punch core also has a through-hole communicating with the sprue, and a sealing slider is slidably installed in the through-hole. The lower surface of the sealing slider is a planar structure. The punch core has multiple receiving cavities arranged around the molding cavity, and piston assemblies are slidably installed in the receiving cavities. The upper mold base is movably raised and lowered and has a sliding bracket connected to each piston assembly. The upper mold base is also hinged with a lever, one end of which is movably hinged to the sliding bracket, and the other end is movably abutting against the upper end of the sealing slider. The upper mold base is also provided with an elastic drive assembly, which movably abuts against the sealing slider to lock the sealing slider in an unlockable manner. The punch core has a connecting groove recessed at the position of each receiving cavity to connect the corresponding receiving cavity with the molding cavity when the mold is closed.

[0006] Preferably, the other end of the lever is provided with a pressure arm, the upper end of the sealing slider is provided with a first pin, and a first spring is provided between the upper end of the sealing slider and the top of the punch core. The axis of the first spring is parallel to the sliding direction of the sealing slider so that the first pin and the pressure arm are in contact and abut against each other. The sliding bracket is equipped with a second pin, and one end of the lever is provided with a strip hole, through which the second pin moves.

[0007] Preferably, the lever arm of the first pin and the fulcrum of the lever is greater than the lever arm of the second pin and the fulcrum of the lever.

[0008] Preferably, the elastic drive assembly includes a drive seat fixedly mounted on the upper mold base and a drive block slidably disposed on the drive seat. A second spring with a stiffness greater than that of the first spring is disposed between the drive block and the drive seat. The drive block is provided with a wedge-shaped boss inclined along the sliding direction of the sealing slider. The wedge-shaped boss has a first inclined surface and a second inclined surface connected to one end of the first inclined surface. A vertex is formed between the first inclined surface and the second inclined surface. The first inclined surface is disposed away from the sprue, and the second inclined surface is disposed towards the sprue. The sealing slider is also provided with a third pin for engaging with the first and second inclined surfaces.

[0009] Preferably, the elastic drive assembly further includes a push rod disposed on the drive block, one end of the push rod is fixedly disposed on the drive block, the other end of the push rod is slidably disposed on the upper mold base and has a first through hole, and a first conical platform is disposed at the end of the first through hole away from the drive block; Both the punch core and the upper die base have a second through hole on one side corresponding to the position of the first through hole; A push block is provided on one side of the die core. The top of the push block passes through the second through hole and the first through hole in sequence, and is provided with a second tapered platform for cooperating with the first tapered platform. When the die is opened, the push rod drives the drive block to slide relative to the drive seat by overcoming the elastic force of the second spring through the first tapered platform.

[0010] Preferably, a roller is rotatably sleeved on the outer peripheral wall of the third pin; the wedge-shaped boss remains in contact with the outer peripheral wall of the roller under the elastic force of the second spring.

[0011] Preferably, the drive seat is provided with two guide shafts spaced apart, and the drive block is slidably sleeved on the outer peripheral wall of the two guide shafts. A second spring is sleeved on the outer peripheral wall of each guide shaft.

[0012] Preferably, the piston assembly includes a piston body and a third spring for providing a reset function for the piston body; the piston body is slidably disposed in the receiving cavity, and the stiffness of the second spring is greater than the sum of the stiffness of the first spring and the stiffness of the third spring. The sliding bracket is provided with a connecting shaft for each piston body of the piston assembly. The connecting shaft moves through the upper mold base and extends into the corresponding receiving cavity, and connects with the corresponding piston body.

[0013] Preferably, a heat insulation pad is embedded on the side of the piston body facing away from the connecting groove, and the two ends of the third spring abut against the upper mold base and the heat insulation pad, respectively.

[0014] Preferably, the lower mold base is slidably provided with an ejector plate, and a fourth spring is provided between the ejector plate and the lower mold plate; the two ends of the ejector plate are respectively provided with first ejector pins that are movable and pass through the lower mold base and the die core, and the middle part of the ejector plate is provided with multiple second ejector pins that are movable and pass through the lower mold base and the die core.

[0015] The beneficial effects of this invention are as follows: By setting an oblique hole communicating with the sprue and a sealing slider with a flat lower surface inside the punch core, and setting a receiving cavity and a piston assembly around the molding cavity in the punch core, and connecting the piston assembly and the sealing slider through a sliding bracket and lever transmission, and cooperating with an elastic drive assembly that can unlockably lock the sealing slider, during the liquid metal filling process, the pressure of the liquid metal entering the receiving cavity can be used to push the piston assembly upward, and through lever transmission, drive the sealing slider to slide along the oblique hole and seal the sprue after filling is completed, so that the part of the molded product corresponding to the sprue forms a flat surface, eliminating the need for a special sprue removal process and a finishing process, effectively improving production efficiency, shortening the production cycle and reducing manufacturing costs.

[0016] The accommodating cavity is connected to the forming cavity via a connecting groove. Together with the sliding piston assembly, it forms a slag bag structure with a variable volume, which can accommodate the low-temperature cold material at the front of the filling and the gas in the cavity, thus improving the casting quality. The elastic drive component can reliably lock the sealing slider after the gate is sealed, preventing the sealing slider from rebounding due to the back pressure of the liquid metal during the pressure holding stage, ensuring a stable sealing state. Moreover, the overall structure relies on the die casting filling pressure to achieve self-driven sealing, without the need for additional external power devices. The structure is compact and highly adaptable to conventional die casting processes. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the die-casting mold of the present invention when it is not closed; Figure 2 This is a cross-sectional schematic diagram of the die-casting mold of the present invention when it is not closed; Figure 3 This is a cross-sectional schematic diagram from the first perspective when the die-casting mold of the present invention is closed; Figure 4 This is a cross-sectional schematic diagram from a second perspective when the die-casting mold of the present invention is closed; Figure 5 yes Figure 4 A magnified view of a portion of point A in the middle; Figure 6 This is a cross-sectional schematic diagram from a third perspective when the die-casting mold of the present invention is closed; Figure 7This is a schematic diagram of the structure of the lower mold of the present invention; Figure 8 This is a cross-sectional schematic diagram of the lower mold of the present invention; Figure 9 This is a schematic diagram of the upper mold of the present invention; Figure 10 yes Figure 9 A magnified view of a portion of point B in the middle; Figure 11 This is a cross-sectional schematic diagram of the upper mold of the present invention; Figure 12 This is a schematic diagram of the structure of the present invention after the upper mold is hidden from the upper template; Figure 13 This is a schematic diagram of the structure of the elastic drive component, sliding bracket, sealing slider and piston assembly of the present invention. Figure 14 This is a schematic diagram of the sealing slider of the present invention; Figure 15 This is a schematic diagram of the structure of the elastic drive component of the present invention; Explanation of reference numerals in the attached drawings: 11. Upper mold plate; 12. Upper mold base; 13. Punch core; 131. Sprue; 132. Angled hole; 133. Receiving cavity; 134. Communicating groove; 14. Sealing slider; 141. First pin; 142. First spring; 143. Third pin; 144. Roller; 151. Piston body; 152. Third spring; 153. Heat insulation pad; 16. Sliding bracket; 161. Second pin; 162. Connecting shaft; 17. Lever; 171. Pressure arm; 172. Strip hole; 181. Drive base; 1811, guide shaft; 182, drive block; 1821, wedge-shaped boss; 1822, first inclined surface; 1823, second inclined surface; 1824, apex; 183, second spring; 184, push rod; 1841, first through hole; 1842, first conical platform; 21, lower template; 22, lower mold base; 23, die core; 24, push block; 241, second conical platform; 25, stripper plate; 251, fourth spring; 252, first stripper ejector pin; 253, second stripper ejector pin; 3, forming cavity. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this is not to limit the scope of the invention to this.

[0019] like Figures 1 to 15 As shown in this embodiment, an automotive aluminum alloy control box die-casting mold is mainly used for pressure casting of automotive aluminum alloy control boxes. It can simultaneously cut off the sprue 131 during the die-casting process and automatically separate the slag bag from the product, reducing subsequent processing steps. The die-casting mold includes a cooperating upper mold and a lower mold, which form a product forming space when the mold is closed and can be demolded after the mold is opened.

[0020] like Figure 7 and Figure 8 As shown, the lower mold includes a lower template 21, a lower mold base 22, and a concave mold core 23. The lower template 21 serves as the basic load-bearing component of the lower mold and is used for installation and fixation with the corresponding side of the die-casting equipment. The lower mold base 22 is fixedly installed on the top surface of the lower template 21, and the concave mold core 23 is embedded and fixed in the middle of the lower mold base 22. The top surface of the concave mold core 23 has a cavity structure that corresponds to the outer contour of the automotive aluminum alloy control box.

[0021] like Figures 2 to 6 , Figures 9 to 12 As shown, the upper mold includes an upper template 11, an upper mold base 12, and a punch core 13. The upper template 11 serves as the mounting base for the upper mold and is connected to the corresponding side of the die-casting equipment. The upper mold base 12 is fixedly installed on the bottom surface of the upper template 11, and the punch core 13 is embedded and fixed in the middle of the upper mold base 12. The bottom surface of the punch core 13 has a protruding structure corresponding to the inner contour of the control box. In the mold-closed state, the punch core 13 and the concave mold core 23 are aligned and engaged, forming a forming cavity 3 that communicates with the sprue 131. The shape of the forming cavity 3 is consistent with the shape of the automotive aluminum alloy control box product to be formed.

[0022] A sprue 131 is vertically inserted through the center of the punch core 13, serving as an injection channel for liquid metal. Its lower end connects to the center of the molding cavity 3. An oblique hole 132 also extends through the punch core 13, extending obliquely from the top surface of the punch core 13 to the side wall of the sprue 131, communicating with the internal space of the sprue 131. The oblique hole 132 penetrates the bottom surface of the punch core 13. A sealing slider 14 is slidably installed within the oblique hole 132, its outer wall sealingly engaging with the inner wall of the oblique hole 132. It can slide back and forth along the extension direction of the oblique hole 132, and its lower surface is a flat plane. When the sealing slider 14 slides to its lower limit position, its lower surface is flush with the bottom surface of the punch core 13, completely sealing the lower outlet of the sprue 131, thus forming a complete flat surface on the top surface of the molding cavity 3 and eliminating any residue of the sprue 131 on the product.

[0023] The punch core 13 has multiple accommodating cavities 133, which are evenly spaced around the outer periphery of the forming cavity 3. Each accommodating cavity 133 extends vertically, with a closed upper end and an open lower end. A piston assembly is slidably installed in each accommodating cavity 133, and the piston assembly can slide up and down along the inner wall of the accommodating cavity 133. The bottom surface of the punch core 13 has a connecting groove 134 corresponding to the position of each accommodating cavity 133. One end of the connecting groove 134 is connected to the lower opening of the accommodating cavity 133, and the other end extends to the side wall edge of the forming cavity 3. When the mold is closed, the connecting groove 134 connects the lower space of the corresponding accommodating cavity 133 to the forming cavity 3, so that the accommodating cavity 133, the piston assembly and the die core 23 together enclose a slag cavity with a variable volume, which is used to contain the cold material at the front end, the gas inside the cavity and the excess liquid metal during the die casting process.

[0024] A sliding bracket 16 is movably and vertically mounted above the upper mold base 12. The sliding bracket 16 is an integral frame structure, and each piston assembly is connected to the sliding bracket 16. All piston assemblies can synchronously drive the sliding bracket 16 to move vertically. A lever 17 is also hinged to the top surface of the upper mold base 12. The lever 17 forms a swing lever structure with the hinge point as the fulcrum. One end of the lever 17 is movably hinged to the sliding bracket 16, and the other end extends to the top of the sealing slider 14 and movably abuts against the upper end of the sealing slider 14. When the piston assembly moves upward under the pressure of liquid metal, it drives the sliding bracket 16 to rise, which in turn drives the lever 17 to swing around the fulcrum, causing the end of the lever 17 near the sealing slider 14 to swing downward, pushing the sealing slider 14 to slide downward along the inclined hole 132, completing the sealing action of the sprue 131.

[0025] Specifically, such as Figure 12 and Figure 13 As shown, a pressure arm 171 extends from the end of the lever 17 near the sealing slider 14. A first pin 141 protrudes from the upper side of the sealing slider 14, and the axis of the first pin 141 is perpendicular to the swing plane of the lever 17. A first spring 142 is provided between the upper end of the sealing slider 14 and the top surface of the punch core 13. The axis of the first spring 142 is parallel to the sliding direction of the sealing slider 14. The first spring 142 is always in a compressed state, applying a restoring force upward along the inclined hole 132 to the sealing slider 14, so that the outer peripheral wall of the first pin 141 always keeps in contact with the bottom surface of the pressure arm 171, ensuring that there is no gap in the transmission process.

[0026] like Figure 12 and Figure 13As shown, a second pin 161 protrudes from the sliding bracket 16 corresponding to the position of the lever 17. A slotted hole 172 is formed at one end of the lever 17 near the sliding bracket 16, extending along the length of the lever 17. The second pin 161 is movably inserted into the slotted hole 172 and can slide relative to it along the length of the slotted hole 172. Through the cooperation of the slotted hole 172 and the second pin 161, a hinged connection is achieved between the sliding bracket 16 and the lever 17, and the horizontal displacement difference at the hinge point during the swing of the lever 17 is compensated, ensuring smooth transmission.

[0027] like Figure 12 As shown, the lever arm length between the first pin 141 and the fulcrum of the lever 17 is greater than the lever arm length between the second pin 161 and the fulcrum of the lever 17, thus forming a force-saving lever 17 structure. Through this lever arm setting, the small upward driving force of the sliding bracket 16 can be amplified into a larger downward pressure of the sealing slider 14, ensuring that the sealing slider 14 can reliably seal the water inlet 131 and withstand the pressure of the liquid metal.

[0028] Specifically, such as Figures 2 to 4 , Figures 11 to 15 As shown, the top surface of the upper mold base 12 is also provided with an elastic drive component. The elastic drive component is in movable contact with the sealing slider 14 and can be unlocked to lock the sealing slider 14, so that the sealing slider 14 remains in a stable position after the sprue 131 is blocked, and avoids rebound due to back pressure from the liquid metal.

[0029] Specifically, the elastic drive assembly includes a drive base 181 and a drive block 182; the drive base 181 is fixedly installed on the top surface of the upper mold base 12, and the drive block 182 is slidably installed on the drive base 181, with the sliding direction being horizontal and perpendicular to the sliding direction of the sealing slider 14; a second spring 183 is provided between the drive block 182 and the drive base 181, and the second spring 183 always applies an elastic thrust to the drive block 182 in the direction of the sealing slider 14, and the stiffness of the second spring 183 is greater than the stiffness of the first spring 142.

[0030] A wedge-shaped boss 1821 is provided on the side of the drive block 182 facing the sealing slider 14. The wedge-shaped boss 1821 extends inclinedly along the sliding direction of the sealing slider 14. The wedge-shaped boss 1821 has a first inclined surface 1822 and a second inclined surface 1823. The first inclined surface 1822 and the second inclined surface 1823 meet at the top of the wedge-shaped boss 1821 to form a vertex 1824. The first inclined surface 1822 is inclined away from the sprue 131, and the second inclined surface 1823 is inclined towards the sprue 131. A third pin 143 is protruded on the side of the sealing slider 14 corresponding to the position of the wedge-shaped boss 1821. The third pin 143 extends into the mating area of ​​the wedge-shaped boss 1821 and can roll or slide with the first inclined surface 1822 and the second inclined surface 1823 respectively.

[0031] When the sealing slider 14 slides down to block the water inlet 131, the third pin 143 moves relative to the first inclined surface 1822, squeezing the drive block 182 to slide away from the sealing slider 14 against the elastic force of the second spring 183; when the third pin 143 passes the apex 1824 of the wedge-shaped boss 1821, the second spring 183 pushes the drive block 182 to reset, and the second inclined surface 1823 abuts against the top of the third pin 143, restricting the sealing slider 14 from rebounding upward, thereby achieving one-way locking of the sealing slider 14 and ensuring a stable sealing state.

[0032] like Figure 6 As shown, the elastic drive assembly also includes a push rod 184. One end of the push rod 184 is fixedly connected to the drive block 182 and slides horizontally synchronously with the drive block 182. The other end of the push rod 184 extends horizontally and slides through the top wall of the upper mold base 12. A first through hole 1841 is provided through the push rod 184, and a first conical platform 1842 is provided at the end of the first through hole 1841 away from the drive block 182. The punch core 13 and the upper mold base 12 are both provided with a second through hole at the corresponding position on the same side. In the mold closed state, the second through hole is coaxially aligned with the first through hole 1841. A push block 24 is fixedly provided on the corresponding side of the die core 23. The push block 24 extends upward in the vertical direction. The top of the push block 24 is provided with a second conical platform 241. Preferably, the cone angle of the second conical platform 241 is adapted to the cone angle of the first conical platform 1842.

[0033] During the mold opening process, the upper mold moves upward as a whole, and the push block 24 moves downward relative to the upper mold. The second conical platform 241 extends into the first through hole 1841, and its conical surface and the conical surface of the first conical platform 1842 fit and press against each other, converting the relative motion in the vertical direction into a horizontal thrust. This pushes the push rod 184 to drive the drive block 182 to overcome the elastic force of the second spring 183 and slide away from the sealing slider 14. This causes the second inclined surface 1823 of the wedge-shaped boss 1821 to disengage from the third pin 143, releasing the lock on the sealing slider 14. This achieves synchronous linkage between the mold opening action and the unlocking action, without the need for additional drive components.

[0034] Specifically, such as Figures 12 to 15 As shown, a roller 144 is rotatably fitted onto the outer peripheral wall of the third pin 143, and the roller 144 can rotate freely around the axis of the third pin 143. Under the elastic force of the second spring 183, the wedge-shaped boss 1821 always maintains contact between the first inclined surface 1822 or the second inclined surface 1823 and the outer peripheral wall of the roller 144. The roller 144 converts the sliding friction between the wedge-shaped boss 1821 and the third pin 143 into rolling friction, which greatly reduces the wear of the mating surfaces and improves the smoothness of transmission and the service life of the components.

[0035] Specifically, such as Figure 15 As shown, two guide shafts 1811 are arranged parallel to each other on the drive base 181, and both guide shafts 1811 extend horizontally along the sliding direction of the drive block 182. Two guide holes are correspondingly formed on the drive block 182. The drive block 182 slides onto the outer peripheral wall of the two guide shafts 1811 through the two guide holes. The guide shafts 1811 provide precise guidance for the sliding of the drive block 182, ensuring no wobble during the sliding process. A second spring 183 is fitted onto the outer peripheral wall of each guide shaft 1811. One end of the second spring 183 abuts against the side wall of the drive base 181, and the other end abuts against the side wall of the drive block 182. The double spring configuration provides a uniform and stable restoring force for the drive block 182.

[0036] Specifically, such as Figure 4 and Figure 5 As shown, each piston assembly includes a piston body 151 and a third spring 152. The piston body 151 has a cylindrical structure with a sealing element on its outer periphery, which is slidably disposed within the receiving cavity 133 to ensure the sealing performance between the piston body 151 and the inner wall of the receiving cavity 133. The third spring 152 is used to provide a reset function for the piston body 151, pushing the piston body 151 to remain at the lower end of the receiving cavity 133 in the initial state. The stiffness of the second spring 183 is greater than the sum of the stiffness of the first spring 142 and the stiffness of the third spring 152, ensuring that in the locked state, the locking force provided by the second spring 183 can overcome the combined rebound force of the first spring 142 and the third spring 152, so that the sealing slider 14 is stably maintained in the sealing position and will not rebound and loosen. like Figure 13 As shown, the sliding bracket 16 is provided with a connecting shaft 162 for each piston body 151 of each piston assembly. The connecting shaft 162 extends downward in the vertical direction, passes through the upper mold base 12 and extends into the corresponding accommodating cavity 133. The lower end of the connecting shaft 162 is fixedly connected to the top surface of the corresponding piston body 151, so that the piston body 151 and the sliding bracket 16 can move up and down synchronously.

[0037] Specifically, such as Figure 5 As shown, a heat insulation pad 153 is embedded on the side of the piston body 151 facing away from the connecting groove 134, i.e., on the top surface of the piston body 151. The heat insulation pad 153 is made of high-temperature resistant heat insulation material, which can block the heat transferred upward from the high-temperature liquid metal in the accommodating cavity 133, prevent heat conduction to the third spring 152 and the sliding bracket 16, prevent the spring from losing its elasticity due to high temperature, and ensure the working stability and service life of the components. The third spring 152 is sleeved on the outer periphery of the connecting shaft 162, with its lower end abutting against the top surface of the heat insulation pad 153 and its upper end abutting against the bottom surface of the upper mold base 12.

[0038] Specifically, such as Figures 2 to 4 , Figure 8As shown, a stripper plate 25 is slidably disposed within the lower mold base 22. The stripper plate 25 is horizontally disposed between the lower mold base 22 and the lower mold plate 21 and can slide back and forth in the vertical direction. A fourth spring 251 is disposed between the stripper plate 25 and the lower mold plate 21. The fourth spring 251 is arranged in the vertical direction and always applies an upward elastic thrust to the stripper plate 25.

[0039] First ejector pins 252 are fixedly mounted upwards at both ends of the ejector plate 25. Both first ejector pins 252 movably and sealingly penetrate the lower mold base 22 and the die core 23, with their tops extending out of the cavity surface of the die core 23 in the initial state. Multiple second ejector pins 253 are fixedly mounted upwards at the middle of the ejector plate 25. These second ejector pins 253 movably and sealingly penetrate the lower mold base 22 and the die core 23, with their tops corresponding to the product forming area of ​​the forming cavity 3. When the mold is closed, the bottom surface of the punch core 13 presses down on the first ejector pins 252, causing the ejector plate 25 to move downwards against the elastic force of the fourth spring 251. Simultaneously, the second ejector pins 253 retract, their tops becoming flush with the cavity surface of the die core 23, without affecting product forming. After the mold is opened, the fourth spring 251 pushes the ejector plate 25 upwards, and the second ejector pins 253 simultaneously move upwards, ejecting the formed control box product out of the die core 23.

[0040] To enable those skilled in the art to more clearly understand this embodiment, the working principle of this embodiment will be further explained below in conjunction with the complete working process: In the initial state, the mold is in the open state, the stripper plate 25 is in the upper position under the elastic force of the fourth spring 251, and the first stripper pin 252 and the second stripper pin 253 both extend upwards out of the cavity surface of the die core 23; the sealing slider 14 is in the upper position under the elastic force of the first spring 142, and the sprue 131 remains unobstructed; the piston body 151 is in the lower position of the receiving cavity 133 under the elastic force of the third spring 152, and the sliding bracket 16 is simultaneously in the lower position; the drive block 182 is in the initial position close to the sealing slider 14 under the elastic force of the second spring 183, and the roller 144 is in contact with the first inclined surface 1822.

[0041] During die casting, the upper and lower molds gradually close. During the mold closing process, the punch core 13 first contacts the top of the first ejector pin 252. As the mold closing stroke increases, the punch core 13 presses down on the first ejector pin 252, pushing the ejector plate 25 to move downward against the elastic force of the fourth spring 251. The second ejector pin 253 retracts downward synchronously with the ejector plate 25. At the same time, the second conical platform 241 of the push block 24 gradually enters the second through hole. The conical surface of the second conical platform 241 cooperates with the conical surface of the first conical platform 1842, pushing the push rod 184 to drive the drive block 182 to slide away from the sealing slider 14 against the elastic force of the second spring 183. The wedge-shaped boss 1821 retracts synchronously, releasing the restriction on the roller 144. At this time, the first spring 142 pushes the sealing slider 14 to maintain a fully reset state, and the piston body 151 also maintains a fully reset state under the elastic force of the third spring 152.

[0042] After the mold is closed, the punch core 13 and the die core 23 are precisely aligned and enclosed to form the forming cavity 3. Each accommodating cavity 133, the piston body 151 and the die core 23 enclose each other to form a slag-filled cavity. Each slag-filled cavity is connected to the forming cavity 3 through the corresponding connecting groove 134. After the second conical platform 241 passes through the first through hole 1841, the second spring 183 pushes the drive block 182 and the push rod 184 to reset, so that the first inclined surface 1822 of the wedge-shaped boss 1821 keeps in contact with the outer peripheral wall of the roller 144.

[0043] Subsequently, liquid metal (liquid aluminum alloy) is injected into the forming cavity 3 through the sprue 131. During the process of filling the forming cavity 3 with liquid metal, the cold material with a lower front temperature and the air in the cavity enter the slag chamber through the connecting groove 134 along with the liquid metal. After the forming cavity 3 is completely filled, the excess liquid metal continues to enter the slag chamber. The pressure of the liquid metal pushes the piston body 151 to move upward against the elastic force of the third spring 152, and the effective volume of the slag chamber increases accordingly.

[0044] During the upward movement of the piston body 151, the sliding bracket 16 is moved upward synchronously through the connecting shaft 162. The sliding bracket 16 drives one end of the lever 17 to swing upward through the cooperation of the second pin 161 and the strip hole 172. The lever 17 rotates around the fulcrum, causing the other end with the pressure arm 171 to swing downward. The pressure arm 171 presses down on the first pin 141, pushing the sealing slider 14 to slide downward along the inclined hole 132 until the lower surface of the sealing slider 14 is flush with the bottom surface of the punch core 13, completely sealing the lower outlet of the sprue 131.

[0045] At the same time, the sealing slider 14 drives the third pin 143 and the roller 144 to move downwards synchronously. The roller 144 rolls relative to the first inclined surface 1822, and the squeeze drive block 182 overcomes the elastic force of the second spring 183 to slide away from the sealing slider 14. When the roller 144 passes the apex 1824 of the wedge-shaped boss 1821, the second spring 183 pushes the drive block 182 to reset towards the sealing slider 14. The roller 144 falls into one side of the second inclined surface 1823, and the second inclined surface 1823 abuts against the outer peripheral wall of the roller 144. Since the stiffness of the second spring 183 is greater than the sum of the stiffnesses of the first spring 142 and the third spring 152, the elastic force of the second spring 183 forms a locking force on the sealing slider 14 through the wedge-shaped boss 1821 and the roller 144, so that the sealing slider 14 is stably kept in the sealing state. The molded control box product forms a smooth surface at the position corresponding to the sprue 131, with no sprue 131 residue. The liquid metal is held under pressure and cooled in the molding cavity 3 to form the molded product.

[0046] After the product is formed, the upper mold moves upward to open the mold. In the initial stage of mold opening, the second conical platform 241 of the push block 24 is still in the first through hole 1841. As the upper mold moves upward, the second conical platform 241 and the first conical platform 1842 maintain a conical surface fit, pushing the push rod 184 to drive the drive block 182 to slide away from the sealing slider 14 against the elastic force of the second spring 183, so that the second inclined surface 1823 of the wedge-shaped boss 1821 disengages from the roller 144, releasing the lock on the sealing slider 14. After the lock is released, the sealing slider 14 slides upward along the inclined hole 132 to reset under the elastic force of the first spring 142, and the sprue 131 reopens; the piston body 151 maintains downward pressure under the elastic force of the third spring 152, pressing the slag bag formed in the slag bag cavity.

[0047] During the mold opening process, the fourth spring 251 gradually pushes the stripper plate 25 upward to reset, and the second stripper pin 253 moves upward synchronously with the stripper plate 25, pushing the formed control box product upward to separate from the die core 23; since the slag bag is pressed and restricted by the piston body 151 to limit axial displacement, the product is pushed upward out of the die core with the second stripper pin 253, and the two generate relative tension at the position of the connecting groove 134, realizing the automatic separation of the slag bag from the product, without the need for a subsequent special sprue 131 removal process.

[0048] As the upper mold continues to move upward, after the second conical platform 241 disengages from the first conical platform 1842, the push rod 184 and the drive block 182 reset under the elastic force of the second spring 183. The drive block 182 returns to its initial position, and the first inclined surface 1822 re-contacts the outer peripheral surface of the roller 144. The mold as a whole returns to its initial state, waiting for the next die-casting cycle.

[0049] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included within the protection scope of this patent application.

Claims

1. A die-casting mold for an automotive aluminum alloy control box, characterized in that, Includes upper mold and lower mold; The lower mold includes a lower template, a lower mold base disposed on the lower template, and a cavity core disposed on the lower mold base; The upper mold includes an upper template, an upper mold base on the upper template, and a punch core on the upper mold base. A sprue is provided through the center of the punch core. When the punch core and the die core are closed, they form a molding cavity communicating with the sprue. The punch core also has a through-hole communicating with the sprue, and a sealing slider is slidably installed in the through-hole. The lower surface of the sealing slider is a planar structure. The punch core has multiple receiving cavities arranged around the molding cavity, and piston assemblies are slidably installed in the receiving cavities. The upper mold base is movably raised and lowered and has a sliding bracket connected to each piston assembly. The upper mold base is also hinged with a lever, one end of which is movably hinged to the sliding bracket, and the other end is movably abutting against the upper end of the sealing slider. The upper mold base is also provided with an elastic drive assembly, which movably abuts against the sealing slider to lock the sealing slider in an unlockable manner. The punch core has a connecting groove recessed at the position of each receiving cavity to connect the corresponding receiving cavity with the molding cavity when the mold is closed.

2. The automotive aluminum alloy control box die-casting mold according to claim 1, characterized in that, The other end of the lever is provided with a pressure arm, the upper end of the sealing slider is provided with a first pin, and a first spring is provided between the upper end of the sealing slider and the top of the punch core. The axis of the first spring is parallel to the sliding direction of the sealing slider so that the first pin and the pressure arm are in contact and abut against each other. The sliding bracket is equipped with a second pin, and one end of the lever is provided with a strip hole, through which the second pin moves.

3. The automotive aluminum alloy control box die-casting mold according to claim 2, characterized in that, The lever arm of the first pin and the fulcrum of the lever is greater than the lever arm of the second pin and the fulcrum of the lever.

4. The automotive aluminum alloy control box die-casting mold according to claim 2, characterized in that, The elastic drive assembly includes a drive base fixedly mounted on the upper mold base and a drive block slidably disposed on the drive base. A second spring with a stiffness greater than that of the first spring is disposed between the drive block and the drive base. The drive block is provided with a wedge-shaped boss that is inclined along the sliding direction of the sealing slider. The wedge-shaped boss has a first inclined surface and a second inclined surface connected to one end of the first inclined surface. A vertex is formed between the first inclined surface and the second inclined surface. The first inclined surface is disposed away from the sprue, and the second inclined surface is disposed towards the sprue. The sealing slider is also provided with a third pin for engaging with the first and second inclined surfaces.

5. The automotive aluminum alloy control box die-casting mold according to claim 4, characterized in that, The elastic drive assembly also includes a push rod disposed on the drive block. One end of the push rod is fixedly disposed on the drive block, and the other end of the push rod is slidably disposed on the upper mold base and has a first through hole. A first conical platform is disposed at the end of the first through hole away from the drive block. Both the punch core and the upper die base have a second through hole on one side corresponding to the position of the first through hole; A push block is provided on one side of the die core. The top of the push block passes through the second through hole and the first through hole in sequence, and is provided with a second tapered platform for cooperating with the first tapered platform. When the die is opened, the push rod drives the drive block to slide relative to the drive seat by overcoming the elastic force of the second spring through the first tapered platform.

6. The automotive aluminum alloy control box die-casting mold according to claim 4, characterized in that, A roller is rotatably fitted on the outer peripheral wall of the third pin; the wedge-shaped boss remains in contact with the outer peripheral wall of the roller under the elastic force of the second spring.

7. The automotive aluminum alloy control box die-casting mold according to claim 4, characterized in that, The drive seat has two guide shafts spaced apart. The drive block is slidably sleeved on the outer peripheral wall of the two guide shafts. A second spring is sleeved on the outer peripheral wall of each guide shaft.

8. The automotive aluminum alloy control box die-casting mold according to claim 4, characterized in that, The piston assembly includes a piston body and a third spring for providing a reset function for the piston body; the piston body is slidably disposed in the receiving cavity, and the stiffness of the second spring is greater than the sum of the stiffness of the first spring and the stiffness of the third spring. The sliding bracket is provided with a connecting shaft for each piston body of the piston assembly. The connecting shaft moves through the upper mold base and extends into the corresponding receiving cavity, and connects with the corresponding piston body.

9. The automotive aluminum alloy control box die-casting mold according to claim 8, characterized in that, A heat insulation pad is embedded on the side of the piston body facing away from the connecting groove, and the two ends of the third spring abut against the upper mold base and the heat insulation pad, respectively.

10. The die-casting mold for an automotive aluminum alloy control box according to any one of claims 1 to 9, characterized in that, The lower mold base is slidably provided with a stripper plate, and a fourth spring is provided between the stripper plate and the lower mold plate; the two ends of the stripper plate are respectively provided with a first stripper ejector pin that is movable and passes through the lower mold base and the die core, and the middle of the stripper plate is provided with a number of second stripper ejector pins that are movable and pass through the lower mold base and the die core.

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