A die-casting device and die-casting method for an automobile engine end cover

Abstract

The present invention relates to the field of die-casting technology, and specifically relates to a die-casting device and a die-casting method for an automotive engine end cover, including a moving die and a fixed die. A thimble and a top plate are arranged in the moving die, and 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 thimble. A movable driving plate is further arranged in the moving die, and the driving plate is in transmission connection with the eccentric wheel. By arranging a rotatable eccentric wheel on the top plate and equipping a driving plate in the moving die that is in transmission connection with 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 thimble, enhancing the knocking effect of the thimble on the formed part, enabling the thimble 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 for quick demolding.

Description

Technical Field

[0001] The present invention relates to the technical field of die-casting, and specifically relates 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 an automotive engine end cover, the demolding link directly affects the product quality and production efficiency. The engine end cover usually has complex structural features, including multiple reinforcing ribs, thin-wall areas, and uneven wall thickness distribution, which makes 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 existence of the 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:

[0003] Reinforcing ribs sticking to the mold: The reinforcing ribs on the engine end cover are easily tightly adhered to the mold cavity after die-casting, resulting in an increase in ejection resistance. It is difficult to demold smoothly only by conventional ejector rods, and even the reinforcing ribs may break or deform due to excessive local stress.

[0004] Uneven ejection leading 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 area or the root of the reinforcing rib, affecting the product dimensional accuracy and assembly performance.

[0005] 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.

[0006] This die-casting mold structure can achieve the purpose of the knocking block fixed below the second sliding push rod knocking against the first strip plate, 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 demolding 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

[0007] Aiming at the problems existing in the prior art, a die-casting device and a die-casting method for an automobile engine end cover are provided. By arranging a rotatable eccentric wheel on the top plate and equipping a driving plate in the moving die which is in transmission connection with the eccentric wheel, during the die 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, 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.

[0008] To solve the problems of the prior art, the present invention provides a die-casting device for an automobile 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 in transmission connection with 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.

[0009] 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.

[0010] 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 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.

[0011] 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 meshes with the second gear.

[0012] Preferably, the linear-rotary 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 two ends of the torsion spring are respectively connected with the rotating shaft and the top plate; the steering wheel is rotatably arranged in the moving mold and on a side of the driving plate facing away from the top plate; one end of the traction rope is wound on the rotating shaft, and one end of the traction rope penetrates through the driving plate and is connected with the driving plate after being strung across the steering wheel.

[0013] Preferably, a limit bolt is further arranged in the moving mold, and the top plate abuts against the limit bolt. When the driving plate moves from the first position to the second position, the top plate disengages from the limit bolt and moves towards the end cover cavity.

[0014] Preferably, an installation cavity for arranging the top plate and the driving plate is arranged in the moving mold. An upper elastic element is arranged between the top plate and the top end of the installation cavity, and a lower elastic element is arranged between the top plate and the driving plate. The elastic force of the upper elastic element is greater than that of the lower elastic element.

[0015] Preferably, a guide post extending along the moving direction of the top plate and the driving plate is arranged in the installation cavity, and the guide post slidably penetrates through the top plate and the driving plate.

[0016] Preferably, a guiding side plate slidably penetrating through the fixed mold along the mold closing direction is arranged on the fixed mold. A convex edge is arranged at the end of the guiding side plate, and the convex edge abuts against the bottom end of the driving plate and the driving plate moves in the moving mold when further demolding.

[0017] A die-casting method for an automobile engine end cover adopts a die-casting device for an automobile engine end cover, and includes the following steps;

[0018] Step 1, close the mold and inject molten metal into the cavity;

[0019] Step 2, cool, demold, and guide the driving plate to move in the moving 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 top plate drives the ejector pin to eject the formed part from the end cover cavity.

[0020] The beneficial effects of the present application compared with the prior art are:

[0021] This application effectively solves the problem of a single tap not being sufficient for rapid demolding in traditional die-casting molds by providing a rotatable eccentric on the ejector plate and equipping the movable mold with a drive plate connected to the eccentric. During the mold release process, the movement of the drive plate guides the rotation of the eccentric, generating a vibration force along the axial direction of the ejector pin. This vibration force not only enhances the ejector pin's impact on the molded part, but also, through the continuous vibration, enables the ejector pin to continuously and effectively strike the molded part, thereby quickly ejecting it from the mold cavity.

[0022] The eccentric on the ejector plate is connected to the drive plate via a transmission. During the mold release process, the sliding motion of the drive plate drives the eccentric to rotate. This rotation of the eccentric causes a force shift, which is transmitted to the molded part via the ejector pin. Due to the eccentric's asymmetric structure, it generates periodic vibrations during rotation, generating a vibration force along the ejector pin's axis. This vibration significantly increases the impact force of the ejector pin on the molded part, applying multiple rapid and powerful impacts to the molded part in a short period of time, helping the molded part to quickly escape from the cavity and complete the demolding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a stereoscopic diagram of a die-casting device for an automobile engine end cover according to the present invention.

[0024] Figure 2 It is a three-dimensional cross-sectional view of a die-casting device for an automobile engine end cover of the present invention.

[0025] Figure 3 It is a schematic diagram of a first embodiment of a linear-rotational motion conversion mechanism in a die-casting device for an automobile engine end cover of the present invention.

[0026] Figure 4 It is a schematic diagram of a second embodiment of a linear-rotational motion conversion mechanism in a die-casting device for an automobile engine end cover of the present invention.

[0027] Figure 5 It is a schematic diagram of a third embodiment of a linear-rotational motion conversion mechanism in a die-casting device for an automobile engine end cover of the present invention.

[0028] Figure 6 It is a stereoscopic view of a first embodiment of a linear-rotational motion conversion mechanism in a die-casting device for an automobile engine end cover of the present invention.

[0029] Figure 7 The present invention is a stereoscopic diagram of a die-casting device for an automobile engine end cover at a first viewing angle when the fixed die and the movable die are separated.

[0030] Figure 8 The present invention is a stereoscopic diagram of a die-casting device for an automobile engine end cover when the fixed die and the movable die are separated from each other at a second viewing angle.

[0031] Figure 9 It is a three-dimensional exploded view of the linear-rotary motion conversion mechanism in a die-casting device for an automobile engine end cover according to the present invention.

[0032] Figure 10 is Figure 9 The partial enlarged view of part A of

[0033] 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, traction rope. Specific embodiments

[0034] In order 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 with reference to the accompanying drawings and specific embodiments.

[0035] As Figure 1 , Figure 2 , Figure 7 and Figure 8 shown, a die-casting device for an automobile engine end cover includes a moving die 1 and a fixed die 2. The moving die 1 and the fixed die 2 are clamped to form an end cover cavity. An ejector pin 31 passing through the moving die 1 and a top plate 3 connected to the ejector pin 31 are arranged in the moving die 1. An eccentric wheel 4 rotatably connected to the top plate 3 is further arranged 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 arranged 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.

[0036] The moving die 1 and the fixed die 2 are closed to form an end cover cavity. A thimble 31 passing through the moving die 1 is provided in the moving die 1, and a top plate 3 connected to the thimble 31 is provided. An eccentric wheel 4 rotatably connected to the top plate 3 is arranged on the top plate 3. The rotation of the eccentric wheel 4 excites vibration along the sliding direction of the thimble 31 through its eccentric mass, enhancing the knocking effect of the thimble 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, and 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 thimble 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 demoulding. This design effectively solves the problem that a single knock in traditional die-casting moulds is not sufficient for rapid demoulding, improves the demoulding efficiency and shortens the production cycle.

[0037] The driving plate 5 can be connected to the output rod of a hydraulic cylinder or other linear pusher, ensuring that the driving plate 5 can move in the moving die 1.

[0038] Such as Figure 1 and Figure 2 As shown in, a laterally extending rotating shaft 6 is arranged 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 arranged 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.

[0039] A laterally extending rotating shaft 6 is arranged on the top plate 3. Both ends of the rotating shaft 6 are respectively connected to the eccentric wheel 4, forming a rotating drive system for the eccentric wheel 4. In order to achieve precise motion control, a linear-rotary motion conversion mechanism is arranged 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. The rotation process of the eccentric wheel 4 generates a vibration force along the sliding direction of the thimble 31 through its eccentric mass, further enhancing the knocking effect of the thimble 31 on the formed part, ensuring that the formed 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 demoulding effect of traditional die-casting moulds, avoiding the demoulding difficulty problems caused by insufficient or uneven knocking.

[0040] Such as Figure 3 、 Figure 6 、 Figure 9 and Figure 10As shown in the figure, 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 arranged 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 rotatably connected to the first rack 72 and the driving plate 5 respectively.

[0041] 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 rotatably connected to the first rack 72 and the driving plate 5 respectively, so that the vertical movement of the driving plate 5 can precisely control the linear movement 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 movement and the rack, ensuring the smooth rotation of the rotating shaft 6 and the efficient operation of the eccentric wheel 4.

[0042] The first gear 71 is coaxially fixed on the rotating shaft 6. Through the fixed connection with the rotating shaft 6, it is ensured that the rotating shaft 6 can stably transmit the rotational power when the driving 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 driving 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 movement through the meshing with the first gear 71, and then drives the rotating shaft 6 to rotate, thereby 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 formed part.

[0043] As Figure 4 shown in the figure, 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 driving plate 5, and the second rack 75 meshes with the second gear 74.

[0044] As the second embodiment of the linear-rotary motion conversion mechanism, when the driving plate 5 moves vertically, the second rack 75 can convert the linear movement of the driving plate 5 into the rotational movement of the rotating shaft 6 through the meshing with the second gear 74. This linear-rotary motion conversion mechanism greatly improves the transmission efficiency and reduces the energy loss through the precise cooperation of the gear and the rack, while maintaining the stability and reliability of the system. The precise meshing of the second rack 75 and the second gear 74 ensures that the rotational movement of the rotating shaft 6 is precisely controlled during the movement of the driving plate 5, thereby further promoting the rotation of the eccentric wheel 4, exciting the vibration effect, and enhancing the knocking effect of the ejector pin 31 on the formed part.

[0045] AsFigure 5 As 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 mold 1 and is located on the side of the driving plate 5 facing away from the top plate 3; one end of the traction rope 78 is wound around the rotating shaft 6, and one end of the traction rope 78 passes through the driving plate 5 and is bridged on the steering wheel 77 and then connected to the driving plate 5.

[0046] As the third embodiment of the linear-rotary motion conversion mechanism, the torsion spring 76 is coaxially sleeved on the rotating shaft 6 and is respectively connected to the rotating shaft 6 and the top plate 3 through its two ends. When the driving plate 5 moves towards the top plate 3, the rotating shaft 6 is pulled by the traction rope 78 to overcome the elastic force of the torsion spring 76, thereby 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 and ensure a smoother demolding process.

[0047] The steering wheel 77 is used to guide the turning of the traction rope 78 and ensure that the traction rope 78 can be connected to the driving plate 5. The steering 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 steering wheel 77, the traction rope 78 can pass through the driving plate 5 smoothly and be bridged on the steering wheel 77 and connected to the driving plate 5, thereby ensuring the tension transmission efficiency of the traction rope 78 and the accuracy of the movement of the driving plate 5.

[0048] 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 and maintains the smooth operation of the system.

[0049] 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 steering 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.

[0050] As Figure 6 shown, a limit bolt 11 is also provided in the moving mold 1, the top plate 3 abuts against the limit bolt 11, and 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 direction.

[0051] A limit bolt 11 is also provided in the moving die 1. 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 move away from the limit bolt 11 along with the movement of the driving plate 5 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.

[0052] Specifically, the limit bolt 11 is arranged at a specific position in the moving die 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, 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.

[0053] 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, pushing the formed part for demolding. This design not only provides efficient demolding but also ensures the smoothness of the movement, reduces the loss caused by mechanical friction, and improves the demolding accuracy and speed.

[0054] As Figure 6 shown, an installation cavity for arranging the top plate 3 and the driving plate 5 is provided in the moving die 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.

[0055] The difference in elastic force 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 and statically abut 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 abut against the limit bolt 11 during the process of being pushed by the driving plate 5, without unnecessary displacement or deviation.

[0056] It ensures that the eccentric wheel 4 can continuously rotate on the top plate 3 and generate vibrations in the direction of the ejector pin 31, thereby completing an effective demolding operation. Under the action of the relatively large 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, and thus 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 its connection with the traction rope 78 and the rotating shaft 6, assisting in the demolding of the molded part and ensuring the efficiency and precision of the demolding process.

[0057] 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 closer. As the elastic force after the compression of the lower elastic element 13 gradually increases and finally exceeds the elastic force of the upper elastic element 12, the relative position between the top plate 3 and the driving plate 5 changes. At this time, the driving plate 5 drives the top plate 3 to move upward synchronously, starting the ejection operation on the molded part. Under the push of the driving plate 5, the top plate 3, in cooperation with the ejector pin 31, ejects the molded part from the cavity, successfully completing the demolding process.

[0058] As Figure 6 shown, a guide post 14 extending along the moving direction of the top plate 3 and the driving plate 5 is provided in the installation cavity, and the guide post 14 slidably penetrates through the top plate 3 and the driving plate 5.

[0059] 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 precision and reliability of the entire system.

[0060] As Figure 3 shown, a guiding side plate 21 slidably penetrating through the fixed mold 2 along the mold closing direction is provided on the fixed mold 2, and a convex edge 211 is provided 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 within the moving mold 1 when the mold continues to open.

[0061] A guiding side plate 21 is provided on the fixed mold 2 and slides through the fixed mold 2 along the mold closing direction. This guiding side plate 21 provides important support and guidance for the mold splitting between the moving mold 1 and the fixed mold 2. A convex edge 211 is provided 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 splitting process. Specifically, when the mold starts to split, as the guiding side plate 21 slides along the mold closing direction, the convex edge 211, through contact with the bottom end of the driving plate 5, pushes the driving plate 5 to move along a specified trajectory within the moving mold 1, thereby driving the eccentric wheel 4 to rotate within the moving mold 1.

[0062] In this design, the main function of the guiding side plate 21 is to achieve synchronous mold splitting between the fixed mold 2 and the moving mold 1 through 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 come into close contact with the bottom end of the driving plate 5. In this way, the convex edge 211 can effectively push the driving plate 5 to move during the mold splitting process, enabling the driving plate 5 to stably move along a predetermined path within the moving mold 1.

[0063] As the driving plate 5 moves, the eccentric wheel 4 starts to rotate within the moving mold 1. This rotation process not only drives relevant molding auxiliary components but also, through specific structural designs, ensures the stability and accuracy during the entire mold splitting process. The rotation of the eccentric wheel 4 can generate 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 splitting operation. The rotation of the eccentric wheel 4 usually brings a vibration effect, which helps to reduce the adhesion force between the mold and the molded part, thus ensuring that the molded part can be smoothly demolded.

[0064] A die-casting method for an automotive engine end cover uses a die-casting device for an automotive engine end cover, including the following steps;

[0065] Step 1, close the mold and inject molten metal into the cavity;

[0066] Step 2, cool, split 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 molded part from the end cover cavity.

[0067] The above embodiments merely represent one or several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to 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 shall be subject to the appended claims.

Claims

1. A die-casting device for an automotive engine end cover, comprising a moving die and a fixed die. The moving die and the fixed die are closed to form an end cover cavity. A ejector pin penetrating through the moving die and a top plate connected to the ejector pin are arranged in the moving die, characterized in that, An eccentric wheel rotatably connected to the top plate is further provided on the top plate. When the eccentric wheel rotates, the eccentric mass of the eccentric wheel excites vibration along the sliding direction of the thimble. A movable drive plate is further provided in the moving die, and the drive plate is in transmission connection with the eccentric wheel. The drive plate has an initial position, a first position, and a second position in sequence along its moving direction in the moving die. When the drive plate moves from the initial position to the first position, the eccentric wheel rotates; when the drive plate moves from the first position to the second position, the top plate drives the thimble to eject the molded part from the end cap cavity; a laterally extending rotating shaft is provided on the top plate, and both ends of the rotating shaft are connected to the eccentric wheel. A linear-rotary motion conversion mechanism is provided between the top plate and the rotating shaft. When the drive plate moves vertically relative to the top plate, the rotating shaft drives the eccentric wheel to rotate on the top plate; A limit bolt is further provided in the moving die, and the top plate abuts against the limit bolt. When the drive plate moves from the first position to the second position, the top plate disengages from the limit bolt and moves towards the end cap cavity; An installation cavity for accommodating the top plate and the drive plate is provided in the moving die. An upper elastic element is provided between the top plate and the top end of the installation cavity, and a lower elastic element is provided between the top plate and the drive plate. The elastic force of the upper elastic element is greater than the elastic force of the lower elastic element.

2. The die-casting device for the end cover of an automobile engine according to claim 1, characterized in that, The linear-rotary motion conversion mechanism includes a first gear, a first rack, and a connecting rod; The first gear is coaxially and fixedly provided on the rotating shaft; The first rack is provided at the bottom end of the top plate in parallel with the top plate, and the first rack meshes with the first gear; The connecting rod is obliquely provided between the drive plate and the top plate, and both ends of the connecting rod are respectively rotatably connected to the first rack and the drive plate.

3. The die-casting device for the end cover of an automotive engine according to claim 1, characterized in that, The linear-rotary motion conversion mechanism includes a second gear and a second rack; The second gear is coaxially and fixedly provided on the rotating shaft; The second rack is vertically provided on the drive plate, and the second rack meshes with the second gear.

4. A die-casting device for an automotive engine end cover according to claim 1, characterized in that, The linear-rotary 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 both ends of the torsion spring are respectively connected to the rotating shaft and the top plate; The steering wheel is rotatably provided in the moving die 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 penetrates through the drive plate and is connected to the drive plate after straddling the steering wheel.

5. The die-casting device for the end cover of an automobile engine according to claim 1, characterized in that, A guide post extending along the moving direction of the top plate and the drive plate is provided in the installation cavity, and the guide post slidably penetrates through the top plate and the drive plate.

6. A die-casting device for an automobile engine end cover according to any one of claims 1-4, characterized in that, A guiding side plate slidably penetrating through the fixed die along the die closing direction is provided on the fixed die. A convex edge is provided at the end of the guiding side plate, and the convex edge abuts against the bottom end of the drive plate and the drive plate moves in the moving die when further die opening occurs.

7. A die-casting method for an automobile engine end cover, characterized in that, Adopting a die-casting device for an automotive engine end cover as described in any one of claims 1-4, the following steps are included; Step 1: Close the mold and inject molten metal into the cavity; Step 2: Cool down, open the mold, and guide the driving plate to move within the moving 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 top plate drives the ejector pin to eject the molded part from the end cover cavity.

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