Die-casting device and die-casting method for automobile engine end cover

Abstract

The invention relates to the technical field of die-casting, in particular to an automobile engine end cover die-casting device and a die-casting method.The automobile engine end cover die-casting device comprises a movable die and a fixed die, an ejector pin and a top plate are arranged in the movable die, and an eccentric wheel rotationally connected with the top plate is further arranged on the top plate; a movable driving plate is further arranged in the movable mold and is in transmission connection with the eccentric wheel, the rotatable eccentric wheel is arranged on the top plate, the driving plate in transmission connection with the eccentric wheel is arranged in the movable mold, in the mold splitting process, the eccentric wheel is guided to rotate through movement of the driving plate, and therefore vibration force in the axial direction of the ejector pin is generated; and the knocking effect of the ejector pin on the formed part is enhanced, so that the ejector pin can continuously and effectively knock the formed part so as to quickly eject the formed part out of the cavity, and the problem that the traditional die-casting die cannot be quickly demolded by single knocking is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of die-casting, and more specifically, to a die-casting device and a die-casting method for an automotive engine end cover. Background Art

[0002] In the die-casting production process of automotive engine end covers, the demolding link directly affects product quality and production efficiency. Engine end covers usually have complex structural features, including multiple reinforcing ribs, thin-wall regions, and uneven wall thickness distributions, which make it difficult to demold after die-casting. Traditional die-casting devices usually use a ejector rod mechanism to eject the formed part from the cavity. However, due to the presence of reinforcing ribs, the contact area between the formed part and the mold cavity increases, and the clamping force increases, resulting in the following problems during demolding: Reinforcing ribs adhere to the mold: The reinforcing ribs on the engine end cover are prone to tightly adhere to the mold cavity after die-casting, resulting in an increase in ejection resistance. It is difficult to smoothly demold only relying on conventional ejector rods, and even the reinforcing ribs may break or deform due to excessive local stress.

[0003] Uneven ejection leads to deformation: Due to the concentrated force of the ejector rod and the complex structure of the end cover, the force is uneven during the ejection process, which easily causes plastic deformation in the thin-wall region or the root of the reinforcing rib, affecting the dimensional accuracy and assembly performance of the product.

[0004] The patent document publication number CN118253739B discloses an aluminum die-casting mold structure, including a fixed die-casting mold base and a movable die-casting mold base. A base is fixed on one side of the fixed die-casting mold base, and a fixed mold insert is arranged in the fixed die-casting mold base. A movable mold insert is arranged in the movable die-casting mold base. A forming cavity is arranged between the movable mold insert and the fixed mold insert. A pouring port communicating with the movable mold insert is arranged on the movable die-casting mold base. Jacking holes are arranged on both the upper and lower sides of the fixed die-casting mold base, and first sliding push rods are arranged on both the upper and lower sides of the movable die-casting mold base.

[0005] This die-casting mold structure can achieve the purpose of knocking the first strip plate with the knocking block fixed below the second sliding push rod, thereby generating an impact force, so that multiple ejector rods are affected by the impact force and can vibrate the workpiece adhered in the fixed mold insert, facilitating the formed workpiece to be affected by the impact force during the demolding process and improving the demolding efficiency. However, knocking only occurs when the knocking block contacts the first strip plate. However, the single knocking force is not sufficient to complete the demolding operation because the transmission of the knocking force is not sufficient to overcome the adhesion force of the mold. Summary of the Invention

[0006] Aiming at the problems existing in the prior art, a die-casting device and a die-casting method for an automotive engine end cover are provided. By arranging a rotatable eccentric wheel on the top plate and equipping a driving plate in the moving die that is drivingly connected to the eccentric wheel, during the mold opening process, the movement of the driving plate guides the rotation of the eccentric wheel, thereby generating a vibration force along the axial direction of the ejector pin, enhancing the knocking effect of the ejector pin on the formed part, enabling the ejector pin to continuously and effectively knock the formed part, and thus quickly ejecting it from the cavity, solving the problem that a single knock in a traditional die-casting mold is not sufficient to quickly demold.

[0007] To solve the problems of the prior art, the present invention provides a die-casting device for an automotive engine end cover, including a moving die and a fixed die. The moving die and the fixed die are closed to form an end cover cavity. An ejector pin passing through the moving die and a top plate connected to the ejector pin are arranged in the moving die. An eccentric wheel rotatably connected to the top plate is further arranged on the top plate. When the eccentric wheel rotates, the eccentric mass of the eccentric wheel excites vibration along the sliding direction of the ejector pin. A movable driving plate is also arranged in the moving die. The driving plate is drivingly connected to the eccentric wheel. The driving plate has an initial position, a first position, and a second position in sequence along its moving direction in the moving die. When the driving plate moves from the initial position to the first position, the eccentric wheel rotates; when the driving plate moves from the first position to the second position, the top plate drives the ejector pin to eject the formed part from the end cover cavity.

[0008] Preferably, a laterally extending rotating shaft is arranged on the top plate. Both ends of the rotating shaft are connected to the eccentric wheel. A linear-rotary motion conversion mechanism is arranged between the top plate and the rotating shaft. When the driving plate moves vertically relative to the top plate, the rotating shaft drives the eccentric wheel to rotate on the top plate.

[0009] Preferably, the linear-rotary motion conversion mechanism includes a first gear, a first rack, and a connecting rod. The first gear is coaxially and fixedly arranged on the rotating shaft. The first rack is arranged at the bottom end of the top plate parallel to the top plate, and the first rack meshes with the first gear. The connecting rod is obliquely arranged between the driving plate and the top plate, and both ends of the connecting rod are respectively rotatably connected to the first rack and the driving plate.

[0010] Preferably, the linear-rotary motion conversion mechanism includes a second gear and a second rack. The second gear is coaxially and fixedly arranged on the rotating shaft. The second rack is vertically arranged on the driving plate, and the second rack meshes with the second gear.

[0011] Preferably, the linear-rotational motion conversion mechanism includes a torsion spring, a steering wheel and a traction rope; the torsion spring is coaxially sleeved on the rotating shaft, and the two ends of the torsion spring are respectively connected to the rotating shaft and the top plate; the steering wheel is rotatably arranged in the movable mold and is located on the side of the drive plate facing away from the top plate; one end of the traction rope is wound around the rotating shaft, and one end of the traction rope passes through the drive plate and is connected to the drive plate after being bridged over the steering wheel.

[0012] Preferably, a limit pin is further provided in the movable mold, and the top plate abuts against the limit pin. When the driving plate moves from the first position to the second position, the top plate disengages from the limit pin and moves toward the end cover cavity.

[0013] Preferably, a mounting cavity for accommodating the top plate and the driving plate is provided in the movable mold, an upper elastic element is provided between the top plate and the top of the mounting cavity, a lower elastic element is provided between the top plate and the driving plate, and the elastic force of the upper elastic element is greater than the elastic force of the lower elastic element.

[0014] Preferably, a guide column extending along the moving direction of the top plate and the driving plate is provided in the installation cavity, and the guide column slides through the top plate and the driving plate.

[0015] Preferably, the fixed mold is provided with a guide side plate that slides through the fixed mold along the mold closing direction, and the end of the guide side plate is provided with a convex edge, which abuts against the bottom end of the driving plate and the driving plate moves in the movable mold when the mold is continued to be separated.

[0016] A die-casting method for an automobile engine end cover, using an automobile engine end cover die-casting device, comprises the following steps; Step 1: closing the mold and injecting molten metal into the cavity; Step 2: cooling, mold separation, and guiding the driving plate to move in the movable mold. When the driving plate moves from the initial position to the first position, the eccentric wheel rotates; when the driving plate moves from the first position to the second position, the ejector plate drives the ejector pin to eject the molded part from the end cover cavity.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present application provides a rotatable eccentric wheel on the top plate, and equips the movable mold with a driving plate that is transmission-connected to the eccentric wheel. This design effectively solves the problem that a single knock in the traditional die-casting mold is not enough for rapid demolding. During the mold separation process, the movement of the driving plate guides the rotation of the eccentric wheel, thereby generating a vibration force along the axial direction of the ejector pin. This vibration force can not only enhance the knocking effect of the ejector pin on the molded part, but also enable the ejector pin to continuously and effectively knock on the molded part through continuous vibration, thereby quickly ejecting it from the cavity.

[0018] The eccentric wheel on the top plate drives the rotation of the eccentric wheel through the transmission connection with the driving plate during the mold opening process. The driving plate drives the eccentric wheel to rotate through its sliding motion. The rotation of the eccentric wheel causes the offset of the force, and this force is transmitted to the molded part through the ejector pin. Due to the asymmetric structure of the eccentric wheel itself, it will generate periodic vibrations when rotating, forming a vibration force along the axial direction of the ejector pin. This vibration can significantly increase the knocking force of the ejector pin on the molded part and apply multiple rapid and powerful impacts to the molded part in a short time, thereby helping the molded part to quickly separate from the cavity and complete the demolding process. Description of the Drawings

[0019] Figure 1 is a perspective view of a die-casting device for an automotive engine end cover according to the present invention.

[0020] Figure 2 is a perspective sectional view of a die-casting device for an automotive engine end cover according to the present invention.

[0021] Figure 3 is a schematic diagram of the first embodiment of the linear-rotary motion conversion mechanism in a die-casting device for an automotive engine end cover according to the present invention.

[0022] Figure 4 is a schematic diagram of the second embodiment of the linear-rotary motion conversion mechanism in a die-casting device for an automotive engine end cover according to the present invention.

[0023] Figure 5 is a schematic diagram of the third embodiment of the linear-rotary motion conversion mechanism in a die-casting device for an automotive engine end cover according to the present invention.

[0024] Figure 6 is a perspective view of the first embodiment of the linear-rotary motion conversion mechanism in a die-casting device for an automotive engine end cover according to the present invention.

[0025] Figure 7 is a perspective view of the die-casting device for an automotive engine end cover according to the present invention when the fixed mold and the moving mold are separated in the first perspective.

[0026] Figure 8 is a perspective view of the die-casting device for an automotive engine end cover according to the present invention when the fixed mold and the moving mold are separated in the second perspective.

[0027] Figure 9 is an exploded perspective view of the linear-rotary motion conversion mechanism in a die-casting device for an automotive engine end cover according to the present invention.

[0028] Figure 10 is Figure 9 a partial enlarged view of part A of

[0029] The reference numerals in the figure are: 1, moving die; 11, limit bolt; 12, upper elastic element; 13, lower elastic element; 14, guide post; 2, fixed die; 21, guiding side plate; 211, convex edge; 3, top plate; 31, ejector pin; 4, eccentric wheel; 5, driving plate; 6, rotating shaft; 71, first gear; 72, first rack; 73, connecting rod; 74, second gear; 75, second rack; 76, torsion spring; 77, steering wheel; 78, towing rope. Detailed implementation manners

[0030] To further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners.

[0031] As Figure 1 、 Figure 2 、 Figure 7 and Figure 8 shown, a die-casting device for an automotive engine end cover includes a moving die 1 and a fixed die 2. The moving die 1 and the fixed die 2 are closed to form an end cover cavity. An ejector pin 31 penetrating through the moving die 1 and a top plate 3 connected to the ejector pin 31 are provided in the moving die 1. An eccentric wheel 4 rotatably connected to the top plate 3 is further provided on the top plate 3. When the eccentric wheel 4 rotates, the eccentric mass of the eccentric wheel 4 excites vibration along the sliding direction of the ejector pin 31. A movable driving plate 5 is further provided in the moving die 1. The driving plate 5 is in transmission connection with the eccentric wheel 4. The driving plate 5 has an initial position, a first position and a second position in sequence along its moving direction in the moving die 1. When the driving plate 5 moves from the initial position to the first position, the eccentric wheel 4 rotates; when the driving plate 5 moves from the first position to the second position, the top plate 3 drives the ejector pin 31 to eject the formed part from the end cover cavity.

[0032] The moving die 1 and the fixed die 2 are closed to form an end cover cavity. An ejector pin 31 penetrating through the moving die 1 and a top plate 3 connected to the ejector pin 31 are provided in the moving die 1. An eccentric wheel 4 rotatably connected to the top plate 3 is provided on the top plate 3. The rotation of the eccentric wheel 4 excites vibration along the sliding direction of the ejector pin 31 through its eccentric mass, enhancing the knocking effect of the ejector pin 31 on the formed part. In the moving die 1, a movable driving plate 5 is provided. The driving plate 5 is in transmission connection with the eccentric wheel 4. The driving plate 5 sequentially passes through an initial position, a first position and a second position along the moving direction of the moving die 1. When the driving plate 5 moves from the initial position to the first position, the eccentric wheel 4 starts to rotate, generating a vibration force. The top plate 3 drives the ejector pin 31 to apply a continuous knocking force to the formed part in the end cover cavity, ensuring the separation of the surface of the formed part from the cavity; when the driving plate 5 further moves to the second position, the formed part is quickly ejected, successfully realizing rapid demolding. This design effectively solves the problem that a single knock in a traditional die-casting mold is not sufficient for rapid demolding, improves the demolding efficiency and shortens the production cycle.

[0033] The driving plate 5 can be connected to the output rod of a hydraulic cylinder or other linear pusher to ensure that the driving plate 5 can move in the moving mold 1.

[0034] As Figure 1 and Figure 2 shown, a laterally extending rotating shaft 6 is provided on the top plate 3. Both ends of the rotating shaft 6 are connected to the eccentric wheel 4. A linear-rotary motion conversion mechanism is provided between the top plate 3 and the rotating shaft 6. When the driving plate 5 moves vertically relative to the top plate 3, the rotating shaft 6 drives the eccentric wheel 4 to rotate on the top plate 3.

[0035] A laterally extending rotating shaft 6 is provided on the top plate 3. Both ends of the rotating shaft 6 are respectively connected to the eccentric wheel 4 to form a rotating drive system of the eccentric wheel 4. To achieve precise motion control, a linear-rotary motion conversion mechanism is provided between the top plate 3 and the rotating shaft 6. This mechanism can effectively convert the vertical motion of the driving plate 5 into the rotary motion of the rotating shaft 6. When the driving plate 5 moves vertically relative to the top plate 3, the driving plate 5 drives the rotating shaft 6 to rotate through its connection with the rotating shaft 6, thereby driving the eccentric wheel 4 to rotate. During the rotation process of the eccentric wheel 4, a vibration force along the sliding direction of the ejector pin 31 is generated by its eccentric mass, further enhancing the knocking effect of the ejector pin 31 on the molded part and ensuring that the molded part can be smoothly and quickly ejected from the cavity. The vibration force generated by the rotation of the eccentric wheel 4 can effectively improve the demolding effect of traditional die-casting molds and avoid the problem of difficult demolding caused by insufficient or uneven knocking.

[0036] As Figure 3 , Figure 6 , Figure 9 and Figure 10 shown, the linear-rotary motion conversion mechanism includes a first gear 71, a first rack 72, and a connecting rod 73; the first gear 71 is coaxially and fixedly provided on the rotating shaft 6; the first rack 72 is arranged parallel to the top plate 3 at the bottom end of the top plate 3, and the first rack 72 meshes with the first gear 71; the connecting rod 73 is obliquely arranged between the driving plate 5 and the top plate 3, and both ends of the connecting rod 73 are respectively rotatably connected to the first rack 72 and the driving plate 5.

[0037] As the first embodiment of the linear-rotary motion conversion mechanism, the connecting rod 73 is obliquely arranged between the driving plate 5 and the top plate 3. Both ends of the connecting rod 73 are respectively rotatably connected to the first rack 72 and the driving plate 5, enabling the vertical motion of the driving plate 5 to precisely control the linear motion of the rack through the transmission of the connecting rod 73. The inclination angle and design of the connecting rod 73 reasonably adjust the transmission efficiency between the vertical motion and the rack, ensuring the smooth rotation of the rotating shaft 6 and the efficient operation of the eccentric wheel 4.

[0038] The first gear 71 is coaxially fixed on the rotating shaft 6. Through the fixed connection with the rotating shaft 6, it ensures that the rotating shaft 6 can stably transmit the rotational power when the drive plate 5 moves vertically. The first rack 72 is arranged parallel to the top plate 3 at the bottom end of the top plate 3 and meshes with the first gear 71. When the drive plate 5 moves vertically, the connecting rod 73 deflects to drive the first rack 72 to slide on the top plate 3. The first rack 72 transmits the linear motion through the meshing with the first gear 71, thereby driving the rotating shaft 6 to rotate, and then driving the eccentric wheel 4 to rotate, generating a vibration force along the sliding direction of the ejector pin 31, effectively enhancing the knocking effect of the ejector pin 31 on the molded part.

[0039] As Figure 4 shown, the linear-rotary motion conversion mechanism includes a second gear 74 and a second rack 75; the second gear 74 is coaxially and fixedly arranged on the rotating shaft 6; the second rack 75 is vertically arranged on the drive plate 5, and the second rack 75 meshes with the second gear 74.

[0040] As a second embodiment of the linear-rotary motion conversion mechanism, when the drive plate 5 moves vertically, the second rack 75 can convert the linear motion of the drive plate 5 into the rotational motion of the rotating shaft 6 through the meshing with the second gear 74. This linear-rotary motion conversion mechanism greatly improves the transmission efficiency, reduces the energy loss, and at the same time maintains the stability and reliability of the system through the precise cooperation of the gear and the rack. The precise meshing of the second rack 75 and the second gear 74 ensures that during the movement of the drive plate 5, the rotational action of the rotating shaft 6 is precisely controlled, thereby further promoting the rotation of the eccentric wheel 4, stimulating the vibration effect, and enhancing the knocking action of the ejector pin 31 on the molded part.

[0041] As Figure 5 shown, the linear-rotary motion conversion mechanism includes a torsion spring 76, a steering wheel 77 and a traction rope 78; the torsion spring 76 is coaxially sleeved on the rotating shaft 6, and both ends of the torsion spring 76 are respectively connected to the rotating shaft 6 and the top plate 3; the steering wheel 77 is rotatably arranged in the moving die 1 and is located on the side of the drive plate 5 facing away from the top plate 3; one end of the traction rope 78 is wound on the rotating shaft 6, and one end of the traction rope 78 passes through the drive plate 5 and is connected to the drive plate 5 after straddling the steering wheel 77.

[0042] As the third embodiment of the linear-rotary motion conversion mechanism, the torsion spring 76 is coaxially sleeved on the rotating shaft 6, and its two ends are respectively connected to the rotating shaft 6 and the top plate 3. When the driving plate 5 moves towards the top plate 3, the rotating shaft 6 is pulled by the traction rope 78, overcoming the elastic force of the torsion spring 76, and then driving the eccentric wheel 4 to rotate on the top plate 3, generating vibration along the length direction of the ejector pin 31. This vibration can effectively enhance the knocking effect of the ejector pin 31 on the molded part, ensuring a smoother demolding process.

[0043] The deflecting wheel 77 is used to guide the deflection of the traction rope 78 and ensure that the traction rope 78 can be connected to the driving plate 5. The deflecting wheel 77 is rotatably arranged in the moving mold 1 and is located on the side of the driving plate 5 facing away from the top plate 3. Through the reasonable position of the deflecting wheel 77, the traction rope 78 can smoothly pass through the driving plate 5 and be strung on the deflecting wheel 77 and connected to the driving plate 5, thus ensuring the tension transmission efficiency of the traction rope 78 and the accuracy of the movement of the driving plate 5.

[0044] The function of the torsion spring 76 is to provide the necessary elastic restoring force during the movement of the driving plate 5. When the driving plate 5 moves, the traction rope 78 pulls the rotating shaft 6 to rotate and overcomes the initial elastic force of the torsion spring 76, causing the eccentric wheel 4 to start rotating. As the torsion spring 76 deforms, the rotation of the rotating shaft 6 is further promoted, thereby enhancing the vibration effect of the top plate 3. The torsion spring 76 not only provides a stable return force for the system but also reduces the impact during the movement of the driving plate 5 to a certain extent, maintaining the smooth operation of the system.

[0045] The design of the traction rope 78 enables the vertical movement of the driving plate 5 to be converted into the rotational movement of the rotating shaft 6. Through the reasonable layout of the traction rope 78 and the deflecting wheel 77, each vertical movement of the driving plate 5 can effectively drive the eccentric wheel 4 to rotate, and the generated vibration is transmitted along the direction of the ejector pin 31, further accelerating the demolding process.

[0046] As Figure 6 shown, a limit bolt 11 is further provided in the moving mold 1, and the top plate 3 abuts against the limit bolt 11. When the driving plate 5 moves from the first position to the second position, the top plate 3 disengages from the limit bolt 11 and moves towards the end cap cavity.

[0047] A limit bolt 11 is further provided in the moving mold 1, and its function is to limit the initial position of the top plate 3 and ensure that the top plate 3 can stably abut against the limit bolt 11 during the movement of the driving plate 5. When the driving plate 5 moves from the first position to the second position, the top plate 3 will disengage from the limit bolt 11 as the driving plate 5 moves and move towards the end cap cavity. This design provides an effective positioning function through the physical contact between the limit bolt 11 and the top plate 3, ensuring the precise control and stable movement of the top plate 3 during operation.

[0048] Specifically, the limit bolt 11 is arranged at a specific position of the moving mold 1, so that the top plate 3 always maintains a fixed initial position before being affected by the driving plate 5. During the process of the driving plate 5 moving from the first position to the second position, a force is gradually applied, causing the top plate 3 to break away from the restraint of the limit bolt 11. After the top plate 3 breaks away from the limit bolt 11, the driving plate 5 continues to push the top plate 3 towards the end cap cavity, driving the ejector pin 31 or other forming auxiliary components to complete the demolding operation of the formed part.

[0049] After the top plate 3 breaks away from the limit bolt 11, the continuous movement of the driving plate 5 enables the top plate 3 to move stably and precisely along the direction of the end cap cavity, promoting the demolding of the formed part. This design not only provides efficient demolding but also ensures the smoothness of the movement, reduces the losses caused by mechanical friction, and improves the accuracy and speed of demolding.

[0050] As Figure 6 shown, an installation cavity for arranging the top plate 3 and the driving plate 5 is provided in the moving mold 1. An upper elastic element 12 is arranged between the top plate 3 and the top of the installation cavity, and a lower elastic element 13 is arranged between the top plate 3 and the driving plate 5. The elastic force of the upper elastic element 12 is greater than the elastic force of the lower elastic element 13.

[0051] The difference in elastic forces between the upper elastic element 12 and the lower elastic element 13 ensures that when the driving plate 5 moves towards the top plate 3, the top plate 3 can stably rest against the limit bolt 11, thus providing precise positioning and control for subsequent movements. Specifically, the elastic force of the upper elastic element 12 is greater than the elastic force of the lower elastic element 13 to ensure that the top plate 3 can always remain stationary and rest against the limit bolt 11 during the process of being pushed by the driving plate 5, without unnecessary displacement or deviation.

[0052] It ensures that the eccentric wheel 4 can continuously rotate on the top plate 3 and generate vibrations along the direction of the ejector pin 31, thereby completing an effective demolding operation. Under the action of the greater elastic force provided by the upper elastic element 12 between the top plate 3 and the limit bolt 11, the top plate 3 remains stable and immobile, which enables the eccentric wheel 4 to continuously rotate under a certain pressure, promoting the generation of vibrations, thereby enhancing the vibration effect of the top plate 3. After the vibrations are generated, the top plate 3 can move along the length direction of the ejector pin 31 through the connection with the traction rope 78 and the rotating shaft 6, assisting in the demolding of the formed part and ensuring the efficiency and precision of the demolding process.

[0053] When the driving plate 5 continues to move and the lower elastic element 13 is gradually compressed, the relative elasticity between the top plate 3 and the driving plate 5 becomes tighter. As the elastic force after the compression of the lower elastic element 13 gradually increases, it will eventually exceed the elastic force of the upper elastic element 12, resulting in a change in the relative position between the top plate 3 and the driving plate 5. At this time, the driving plate 5 drives the top plate 3 to move upward synchronously, and starts to eject the molded part. Driven by the driving plate 5, the top plate 3 cooperates with the ejector pin 31 to eject the molded part from the cavity, successfully completing the demolding process.

[0054] As Figure 6 shown, a guide post 14 extending along the moving direction of the top plate 3 and the driving plate 5 is arranged in the installation cavity, and the guide post 14 slidably penetrates through the top plate 3 and the driving plate 5.

[0055] The main function of the guide post 14 is to provide stable guidance for the sliding of the driving plate 5 and the top plate 3, ensuring the accuracy and smoothness of their movement trajectories. Specifically, by slidably penetrating through the top plate 3 and the driving plate 5, the guide post 14 enables the two to maintain a relatively stable position during the movement process, avoiding unnecessary offsets and vibrations, thereby improving the movement accuracy and reliability of the entire system.

[0056] As Figure 3 shown, a guiding side plate 21 slidably penetrating through the fixed mold 2 along the mold closing direction is arranged on the fixed mold 2, and a convex edge 211 is arranged at the end of the guiding side plate 21, and the convex edge 211 abuts against the bottom end of the driving plate 5 and the driving plate 5 moves in the moving mold 1 when the mold continues to be separated.

[0057] A guiding side plate 21 slidably penetrating through the fixed mold 2 along the mold closing direction is arranged on the fixed mold 2. The guiding side plate 21 provides important support and guidance for the mold separation between the moving mold 1 and the fixed mold 2. A convex edge 211 is arranged at the end of the guiding side plate 21. The convex edge 211 is in close contact with the bottom end of the driving plate 5 and plays a key driving role during the mold separation process. Specifically, when the mold starts to separate, as the guiding side plate 21 slides along the mold closing direction, the convex edge 211 drives the driving plate 5 to move along a specified trajectory in the moving mold 1 by contacting the bottom end of the driving plate 5, thereby driving the eccentric wheel 4 to rotate in the moving mold 1.

[0058] In this design, the main function of the guiding side plate 21 is to realize the synchronous mold separation between the fixed mold 2 and the moving mold 1 through its connection with the driving plate 5. Since the guiding side plate 21 has the ability to slide along the mold closing direction, when the mold starts to separate, the guiding side plate 21 will smoothly move along the slideway of the fixed mold 2 and drive the convex edge 211 to have close contact with the bottom end of the driving plate 5. In this way, the convex edge 211 can effectively drive the driving plate 5 to move during the mold separation process, enabling the driving plate 5 to stably move along a predetermined path in the moving mold 1.

[0059] As the driving plate 5 moves, the eccentric wheel 4 starts to rotate within the moving mold 1. This rotation process not only drives the related forming auxiliary components, but also ensures the stability and accuracy during the entire mold opening process through specific structural designs. The rotation of the eccentric wheel 4 can generate the necessary mechanical effects to drive components such as the ejector pin 31 and the top plate 3 within the mold 1 to perform corresponding movements to assist in the demolding or mold opening operation. The rotation of the eccentric wheel 4 usually brings a vibration effect, and this vibration helps to reduce the adhesion force between the mold and the formed part, thereby ensuring that the formed part can be smoothly demolded.

[0060] A die-casting method for an automotive engine end cover, using a die-casting device for an automotive engine end cover, includes the following steps; Step 1, close the mold and inject molten metal into the cavity; Step 2, cool, open the mold, guide the driving plate 5 to move within the moving mold 1. When the driving plate 5 moves from the initial position to the first position, the eccentric wheel 4 rotates; when the driving plate 5 moves from the first position to the second position, the top plate 3 drives the ejector pin 31 to eject the formed part from the end cover cavity.

[0061] The above embodiments only represent one or several implementation manners of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation on the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A die-casting device for an automobile engine end cover, comprising a movable die and a fixed die, wherein the movable die and the fixed die are combined to form an end cover cavity, wherein the movable die is provided with an ejector pin passing through the movable die and an ejector plate connected to the ejector pin, wherein: The ejector plate is also provided with an eccentric wheel rotatably connected thereto. When the eccentric wheel rotates, the eccentric mass of the eccentric wheel excites vibration along the sliding direction of the ejector pin. The movable mold is also provided with a movable driving plate, which is transmission-connected to the eccentric wheel. The driving plate has an initial position, a first position, and a second position in the movable mold along its moving direction. When the driving plate moves from the initial position to the first position, the eccentric wheel rotates; when the driving plate moves from the first position to the second position, the ejector plate drives the ejector pin to eject the molded part from the end cover cavity.

2. The die-casting device for an automobile engine end cover according to claim 1, characterized in that: A laterally extending rotating shaft is arranged on the top plate, and both ends of the rotating shaft are connected to the eccentric wheel. A linear-rotational motion conversion mechanism is arranged between the top plate and the rotating shaft. When the driving plate moves vertically relative to the top plate, the rotating shaft drives the eccentric wheel to rotate on the top plate.

3. The die-casting device for an automobile engine end cover according to claim 2, characterized in that: The linear-rotational motion conversion mechanism includes a first gear, a first rack and a connecting rod; The first gear is coaxially and fixedly arranged on the rotating shaft; The first rack is arranged at the bottom end of the top plate in parallel with the top plate, and the first rack is meshed with the first gear; The connecting rod is obliquely arranged between the driving plate and the top plate, and two ends of the connecting rod are rotatably connected to the first rack and the driving plate respectively.

4. The die-casting device for an automobile engine end cover according to claim 2, characterized in that: The linear-rotational motion conversion mechanism includes a second gear and a second rack; The second gear is coaxially and fixedly arranged on the rotating shaft; The second rack is vertically arranged on the driving plate, and the second rack is meshed with the second gear.

5. The die-casting device for an automobile engine end cover according to claim 2, characterized in that: The linear-rotational motion conversion mechanism includes a torsion spring, a steering wheel and a traction rope; The torsion spring is coaxially sleeved on the rotating shaft, and the two ends of the torsion spring are respectively connected to the rotating shaft and the top plate; The steering wheel is rotatably disposed in the movable mold and is located on a side of the driving plate facing away from the top plate; One end of the traction rope is wound around the rotating shaft, and one end of the traction rope passes through the driving plate and is connected to the driving plate after being bridged over the steering wheel.

6. A die-casting device for an automobile engine end cover according to any one of claims 2 to 5, characterized in that: A limit pin is also provided in the movable mold, and the top plate abuts against the limit pin. When the driving plate moves from the first position to the second position, the top plate disengages from the limit pin and moves toward the end cover cavity.

7. The die-casting device for an automobile engine end cover according to claim 6, characterized in that: The movable mold is provided with a mounting cavity for accommodating the top plate and the driving plate, an upper elastic element is provided between the top plate and the top of the mounting cavity, a lower elastic element is provided between the top plate and the driving plate, and the elastic force of the upper elastic element is greater than the elastic force of the lower elastic element.

8. The die-casting device for an automobile engine end cover according to claim 7, characterized in that: A guide column extending along the moving direction of the top plate and the driving plate is arranged in the installation cavity, and the guide column slides through the top plate and the driving plate.

9. A die-casting device for an automobile engine end cover according to any one of claims 1 to 5, characterized in that: The fixed mold is provided with a guide side plate which slides through the fixed mold along the mold closing direction, and the end of the guide side plate is provided with a convex edge which abuts against the bottom end of the driving plate and the driving plate moves in the movable mold when the mold is continuously opened.

10. A die-casting method for an automobile engine end cover, characterized in that: The die-casting device for an automobile engine end cover as claimed in any one of claims 1 to 5 comprises the following steps: Step 1: closing the mold and injecting molten metal into the cavity; Step 2: cooling, mold separation, and guiding the driving plate to move in the movable mold. When the driving plate moves from the initial position to the first position, the eccentric wheel rotates; when the driving plate moves from the first position to the second position, the ejector plate drives the ejector pin to eject the molded part from the end cover cavity.

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