Guide rod mounting structure, die casting mold ejection mechanism and die casting mold

Abstract

This disclosure relates to a guide rod mounting structure, a die-casting mold ejection mechanism, and a die-casting mold. The guide rod mounting structure includes a drive cylinder and a guide rod axially movable within the drive cylinder. The first end of the guide rod is connected to a reset plate and can drive the reset plate to reciprocate. The guide rod mounting structure also includes a pre-tightening member disposed at the connection between the first end and the reset plate, used to apply radial constraint to ensure the connection remains tight during the movement of the guide rod. Through the above technical solution, the radial constraint applied by the pre-tightening member maintains the tightness of the connection during the movement of the guide rod, preventing loosening due to long-term reciprocating motion. This avoids radial misalignment and eccentric stress caused by loosening of the connection, reduces the possibility of guide rod breakage, and ensures the stable operation of the die-casting mold ejection mechanism.

Description

Technical Field

[0001] This disclosure relates to the field of vehicle manufacturing technology, and in particular to a guide rod mounting structure, a die-casting mold ejection mechanism, and a die-casting mold. Background Technology

[0002] In the ejection mechanism of die-casting molds, the connection between the guide rod and the reset plate is often a threaded design. The threaded connection secures the two, and the guide rod reciprocates under the drive of a hydraulic cylinder to complete the ejection action. However, during long-term use, the threads at the connection end between the guide rod and the reset plate are prone to loosening, leading to radial misalignment at the connection point. This results in uneven stress on the guide rod during movement, making it susceptible to breakage. A broken guide rod requires removing the mold from the machine for replacement, which is not only cumbersome but also delays production and increases costs. Utility Model Content

[0003] To overcome the problems existing in the related technologies, this disclosure provides a guide rod mounting structure, a die casting mold ejection mechanism, and a die casting mold.

[0004] According to a first aspect of the present disclosure, a guide rod mounting structure is provided, comprising: a drive cylinder and a guide rod movably disposed in the drive cylinder along the axial direction, wherein a first end of the guide rod is connected to a reset plate and is capable of driving the reset plate to reciprocate; the guide rod mounting structure further comprises a pre-tightening member disposed at the connection between the first end and the reset plate, for applying radial constraint so that the connection remains tight during the movement of the guide rod.

[0005] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: The guide rod mounting structure provided by this disclosure, by setting a pre-tightening member at the connection between the first end of the guide rod and the reset plate, uses the radial constraint applied by the pre-tightening member to maintain the tightness of the connection during the movement of the guide rod, avoiding loosening due to long-term reciprocating motion, thereby avoiding radial misalignment and off-center stress caused by loosening of the connection, reducing the possibility of guide rod breakage, ensuring the stable operation of the die-casting mold ejection mechanism, and at the same time, by extending the service life of the guide rod, reducing the frequency of maintenance and replacement of the guide rod, reducing downtime caused by maintenance and replacement, and helping to improve production efficiency.

[0006] In some possible implementations, the preload includes a preload screw, and the reset plate has a threaded hole along the radial direction of the guide rod. The preload screw passes through the threaded hole and abuts against the first end. This method of applying radial constraint by a radially tightened preload screw is simple, compact, easy to process and assemble, and allows for flexible control of the radial constraint force by adjusting the screw insertion depth. It adapts to the tightening requirements under different working conditions and provides a reliable anti-loosening effect during long-term use, further ensuring the stable operation of the die-casting mold ejection mechanism.

[0007] In some possible implementations, the first end is provided with a limiting groove extending circumferentially along the guide rod, and the position of the threaded hole corresponds to the limiting groove. After the preload screw passes through the threaded hole, it abuts against the limiting groove. By providing a limiting groove at the first end of the guide rod, the preload screw abuts against the limiting groove after insertion, ensuring that the abutting force of the preload screw always acts within the limiting groove, preventing displacement of the abutting position and ensuring the reliability of radial constraint. Simultaneously, this mating structure also provides axial limiting for the guide rod, preventing axial movement of the guide rod during reciprocating motion.

[0008] In some possible implementations, the preload screw includes a tapered head screw and a flat head screw. The tapered head of the tapered head screw abuts against the limiting groove, and the flat head screw abuts against the top of the tapered head screw. The cooperation between the tapered head screw and the flat head screw achieves both axial positioning of the guide rod through the abutment of the tapered head against the limiting groove and radial constraint of the tapered head screw by the flat head screw, ensuring its positional stability. The combined effect of these two mechanisms further enhances the reliability of the preload.

[0009] In some possible implementations, the limiting groove surrounds the guide rod circumferentially. The limiting groove is a complete circle, thus eliminating the need for precise alignment of the preload screw and the limiting groove during installation. Even at any circumferential angle, the preload screw can easily engage with the limiting groove, significantly simplifying the installation process and improving efficiency.

[0010] In some possible implementations, the drive cylinder includes an axially movable piston rod, which is hollow. A guide rod is sleeved within the piston rod, and a limiting portion is provided at the second end of the guide rod. The limiting portion and the guide rod are integrally constructed, and the limiting portion abuts against the end face of the piston rod axially, clamping the piston rod from both ends respectively with the reset plate. The integral construction of the limiting portion and the guide rod eliminates the connection between them, thus preventing loosening issues that may exist with a connected structure and avoiding breakage of the guide rod during movement.

[0011] According to a second aspect of the present disclosure, a die-casting mold ejection mechanism is provided, including the guide rod mounting structure described in any one of the above embodiments.

[0012] In some possible implementations, the first end of the guide rod is provided with an axially arranged operating hole for engaging with a wrench. The die-casting mold ejection mechanism further includes a slide connected to the reset plate, and the slide has a recessed portion corresponding to the position of the guide rod, the recessed portion being used to avoid the wrench. By providing a recessed portion on the slide corresponding to the position of the guide rod, space is provided for the operating tool, thus allowing maintenance and replacement of the guide rod to be completed online.

[0013] In some possible implementations, the drive cylinders are hydraulic cylinders and include multiple cylinders spaced apart. The die-casting mold ejection mechanism also includes an oil inlet pipe and an oil outlet pipe. The oil inlet ends of the multiple drive cylinders are all connected to the oil inlet pipe, and the oil outlet ends of the multiple drive cylinders are all connected to the oil outlet pipe. The oil inlet pipe has an oil inlet port, and the oil outlet pipe has an oil outlet port. This type of cylinder configuration helps ensure that multiple cylinders obtain the same oil inlet pressure and oil outlet flow rate during operation, ensuring that the actions of each cylinder are highly synchronized, thereby driving the guide rods to move synchronously. This avoids guide rod misalignment due to asynchronous cylinder actions, which could lead to breakage, ensuring stable operation of the die-casting mold ejection mechanism and extending the service life of the guide rods.

[0014] According to a third aspect of the present disclosure, a die-casting mold is provided, including the die-casting mold ejection mechanism described in any one of the above embodiments.

[0015] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0017] Figure 1 This is a schematic diagram of an ejection mechanism for a die-casting mold according to an exemplary embodiment.

[0018] Figure 2 It is based on Figure 1 A schematic diagram of the ejection mechanism of a die-casting mold after omitting components such as the top plate and ejector rod.

[0019] Figure 3 This is a schematic diagram illustrating a guide rod mounting structure according to an exemplary embodiment.

[0020] Figure 4This is a cross-sectional view of a guide rod mounting structure according to an exemplary embodiment.

[0021] Figure 5 This is a schematic diagram of a preload screw according to an exemplary embodiment.

[0022] Figure 6 This is a schematic diagram illustrating another die-casting mold ejection mechanism according to an exemplary embodiment.

[0023] Explanation of reference numerals in the attached figures

[0024] 1-Drive cylinder, 11-Oil inlet pipe, 111-Oil inlet, 12-Oil outlet pipe, 121-Oil outlet, 13-Piston rod, 2-Guide rod, 21-First end, 211-Limiting groove, 22-Second end, 221-Limiting part, 23-Operating hole, 3-Reset plate, 31-Threaded hole, 4-Preload part, 41-Conical head screw, 42-Flat head screw, 5-Reset rod, 6-Top plate, 7-Top rod, 8-Slide seat, 81-Recessed part. Detailed Implementation

[0025] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0026] like Figures 1 to 6 As shown, this exemplary embodiment provides a guide rod mounting structure suitable for the ejection mechanism of a die-casting mold. This structure can be applied to both integrated large die-casting molds and conventional die-casting molds. With the increasing integration and complexity of die-casting products, mold slider ejection technology, through the coordinated action of the slider and the ejection mechanism, solves the problem of difficult demolding of complex structures such as side holes, undercuts, and irregular shapes. This reduces the time required for each step, shortens the overall production cycle, and reduces deformation caused by uneven loading during mold opening.

[0027] The guide rod mounting structure disclosed herein includes a drive cylinder 1 and a guide rod 2 axially movable within the drive cylinder 1. The first end 21 of the guide rod 2 is connected to a reset plate 3 and can drive the reset plate 3 to reciprocate. The drive cylinder 1 can be, for example, a hydraulic cylinder, i.e., a drive cylinder that uses hydraulic oil to provide power to drive the piston rod. Driven by the drive cylinder 1, the guide rod 2 can drive the reset plate 3 to reciprocate, including an ejected position and a retracted position. The reset plate 3 drives the reset rod 5 to move, and the movement of the reset rod 5 drives the top plate 6, which in turn drives the push rod 7 on the top plate 6 to move, thereby completing the ejection action. It should be noted that, unlike the piston rod 13 of the hydraulic cylinder, the guide rod 2 is sleeved within the piston rod 13 and can move axially under the drive of the piston rod 13.

[0028] The guide rod 2 is usually connected and fixed to the reset plate 3 by threads. During long-term use, the threaded connection between the guide rod 2 and the reset plate 3 is prone to loosening, which can cause radial misalignment of the guide rod 2 at the connection point. For example, the axis of the guide rod 2 may not be on the same straight line as the direction of movement of the reset plate 3, which can lead to the breakage of the guide rod 2.

[0029] To address the aforementioned technical issues, the guide rod mounting structure provided in this disclosure further includes a pre-tightening component 4. The pre-tightening component 4 is disposed at the connection between the first end 21 and the reset plate 3, and is used to apply radial constraint to ensure that the connection remains secure during the movement of the guide rod 2. This secure securing refers to a state where, during the movement of the guide rod 2, its first end 21 is always radially locked to the reset plate 3 without relative loosening. This avoids radial misalignment and eccentric stress caused by loosening at the connection, reduces the possibility of guide rod 2 breakage, and ensures the stable operation of the die-casting mold ejection mechanism. Simultaneously, by extending the service life of the guide rod 2, the frequency of maintenance and replacement of the guide rod 2 is reduced, minimizing downtime caused by maintenance and replacement, and thus improving production efficiency.

[0030] There are several ways to ensure that the connection remains secure during the movement of the guide rod 2. In some possible implementations, such as... Figure 2 and Figure 4As shown, the preload 4 includes a preload screw, and the reset plate 3 has a threaded hole 31 along the radial direction of the guide rod 2. The preload screw passes through the threaded hole 31 and abuts against the first end 21. This method of applying radial constraint by a radially tightened preload screw is simple, compact, easy to process and assemble. The radial constraint force can be flexibly controlled by adjusting the screw depth of the preload screw, adapting to the fastening requirements under different working conditions. It can also continuously play a reliable anti-loosening role during long-term use, further ensuring the stable operation of the die-casting mold ejection mechanism. In some other embodiments, the preload 4 can also adopt, for example, an elastic preload structure set between the guide rod 2 and the reset plate 3, or a friction preload structure set between the guide rod 2 and the reset plate 3, etc., which can achieve the connection part to remain tight during the movement of the guide rod 2. This disclosure will not elaborate on these aspects.

[0031] In embodiments where the preload 4 includes a preload screw, such as Figure 3 and Figure 4 As shown, further, the first end 21 is provided with a limiting groove 211 extending circumferentially along the guide rod 2. The position of the threaded hole 31 corresponds to the limiting groove 211. After the preload screw passes through the threaded hole 31, it abuts against the limiting groove 211. By providing a limiting groove 211 at the first end 21 of the guide rod 2, the preload screw abuts against the limiting groove 211 after insertion. The abutting force of the preload screw always acts within the limiting groove 211, avoiding displacement of the abutting position and ensuring the reliability of radial constraint. At the same time, this mating structure can also provide axial limiting for the guide rod 2, preventing the guide rod 2 from moving axially during reciprocating motion.

[0032] In some possible implementations, the preload screw can be a one-piece construction; in other possible implementations, the preload screw can be a separate construction. Taking a separate preload screw as an example... Figure 4 and Figure 5 As shown, the preload screw includes a tapered head screw 41 and a flat head screw 42. The tapered head of the tapered head screw 41 abuts against the limiting groove 211, and the flat head screw 42 abuts against the top of the tapered head screw 41. The tapered head of the tapered head screw 41 abuts against the limiting groove 211 to prevent axial movement of the guide rod 2; the flat head screw 42 abuts against the top of the tapered head screw 41 to limit the radial movement of the tapered head screw 41, thereby reliably confining the tapered head of the tapered head screw 41 within the limiting groove 211. That is, through the cooperation of the tapered head screw 41 and the flat head screw 42, both the abutment of the tapered head against the limiting groove 211 achieves axial limitation of the guide rod 2, and the radial constraint of the tapered head screw 41 by the flat head screw 42 ensures its positional stability. The combined effect of these two mechanisms further enhances the reliability of the preload.

[0033] Optionally, the limiting groove 211 surrounds the guide rod 2 circumferentially, that is, the limiting groove 211 is set in a full circle. Therefore, when installing the pre-tightening screw, there is no need to specifically align the position of the pre-tightening screw and the limiting groove 211. Even if the guide rod 2 is at any circumferential angle, the pre-tightening screw can easily cooperate with the limiting groove 211, which significantly simplifies the installation operation and improves the installation efficiency.

[0034] In some possible implementations, such as Figure 3 and Figure 4 As shown, the drive cylinder 1 includes a piston rod 13 that can move axially. The piston rod 13 is a hollow structure. A guide rod 2 is sleeved inside the piston rod 13. The second end 22 of the guide rod 2 is provided with a limiting part 221. The limiting part 221 and the guide rod 2 are integrally constructed, and the limiting part 221 abuts against the end face of the piston rod 13 axially, and clamps the piston rod 13 from both ends of the piston rod 13 together with the reset plate 3. Under the action of hydraulic oil, the piston rod 13 moves axially. The second end 22 of the guide rod 2 and the reset plate 3 clamp the piston rod 13 from both ends of the piston rod 13. Under the action of hydraulic oil, the axial movement of the piston rod 13 drives the axial movement of the guide rod 2. The limiting part 221 serves to limit and clamp, so that the piston rod 13 and the guide rod 2 can move simultaneously.

[0035] In some related technologies, a nut and washer are threadedly fitted onto the second end 22 of the guide rod 2 to serve as a limiting and clamping mechanism. During the reciprocating motion of the guide rod 2, the connection between the nut and the guide rod 2 may loosen, potentially leading to breakage. However, the guide rod mounting structure provided in this disclosure features a single-piece construction between the limiting part 221 and the guide rod 2. For example, it can be manufactured as a single piece or welded together. This eliminates the loosening issues that can occur with connected structures, thus preventing breakage of the guide rod 2 during its movement.

[0036] According to a second aspect of the present disclosure, a die-casting mold ejection mechanism is also provided, including the guide rod mounting structure of any of the above, and having all of its beneficial effects, which will not be elaborated here.

[0037] In some possible implementations, such as Figure 6 As shown, the first end of the guide rod 2 is provided with an operating hole 23 along the axial direction for cooperating with a wrench. The die-casting mold ejection mechanism also includes a slide 8 connected to the reset plate 3, and the slide 8 is provided with a recess 81 corresponding to the position of the guide rod 2. The recess 81 is used to avoid the wrench. In related technologies, after the guide rod 2 breaks, it usually needs to be removed from the machine for replacement.

[0038] The die-casting mold ejection mechanism disclosed herein provides a recessed portion 81 in the slide block 8 corresponding to the guide rod 2, which provides space for operating tools, allowing for online maintenance and replacement of the guide rod 2. Specifically, when the guide rod 2 breaks, it is pulled out from the second end 22 side, and then the pre-tightening member 4 is first removed from the first end 21 side. Finally, a wrench or other tools are used to pull out the broken portion within the reset plate 3.

[0039] In other possible implementations, such as Figure 2 As shown, the drive cylinder 1 is a hydraulic cylinder and includes multiple cylinders spaced apart. The die-casting mold ejection mechanism also includes an oil inlet pipe 11 and an oil outlet pipe 12. The oil inlet ends of the multiple drive cylinders 1 are all connected to the oil inlet pipe 11, and the oil outlet ends of the multiple drive cylinders 1 are all connected to the oil outlet pipe 12. The oil inlet pipe 11 has an oil inlet port 111, and the oil outlet pipe 12 has an oil outlet port 121. The figure shows an embodiment including two parallel hydraulic cylinders. This type of hydraulic cylinder configuration is beneficial to ensure that multiple hydraulic cylinders obtain the same oil inlet pressure and oil outlet flow rate during operation, ensuring that the action of each hydraulic cylinder is highly synchronized, thereby driving each guide rod 2 to achieve synchronous movement. This can avoid the guide rod 2 from deflecting due to asynchronous hydraulic cylinder action, which could lead to breakage, ensuring stable operation of the die-casting mold ejection mechanism and extending the service life of the guide rod 2. According to a third aspect of the present disclosure, a die-casting mold is also provided, for example, an integrated large die-casting mold for a vehicle chassis, including the die-casting mold ejection mechanism of any of the above.

[0040] It should be understood that spatial relative terms, such as “above,” “upper,” “below,” and “lower,” are used herein to describe the relationship between one element and another shown in the figures. In addition to the orientation depicted in the figures, these spatial relative terms are also intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as “above” or “upper” relative to another element would be “below” or “lower” relative to that other element. Thus, depending on the spatial orientation of the device, the term “above” encompasses both above and below orientations. Devices may have other orientations (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

Claims

1. A guide rod mounting structure adapted to an ejection mechanism of a die casting mold, characterized by comprising: include: The drive cylinder and the guide rod axially movable on the drive cylinder, the first end of the guide rod being connected to the reset plate and capable of driving the reset plate to reciprocate, the guide rod mounting structure also includes a pre-tightening member, the pre-tightening member being disposed at the connection between the first end and the reset plate, for applying radial constraint so that the connection remains tight during the movement of the guide rod.

2. The guide rod mounting structure according to claim 1, characterized in that, The pre-tightening component includes a pre-tightening screw. The reset plate has a threaded hole along the radial direction of the guide rod. The pre-tightening screw passes through the threaded hole and abuts against the first end.

3. The guide rod mounting structure according to claim 2, characterized in that, The first end is provided with a limiting groove extending circumferentially along the guide rod, the position of the threaded hole corresponds to the limiting groove, and the preload screw is inserted into the threaded hole and abuts against the limiting groove.

4. The guide rod mounting structure according to claim 3, characterized in that, The preload screw includes a tapered screw and a flat-head screw, wherein the tapered head of the tapered screw abuts against the limiting groove, and the flat-head screw limits and abuts against the top of the tapered screw.

5. The guide rod mounting structure according to claim 3, characterized in that, The limiting groove surrounds the guide rod circumferentially.

6. The guide rod mounting structure according to any one of claims 1-5, characterized in that, The drive cylinder includes a piston rod that can move axially. The piston rod is a hollow structure. The guide rod is sleeved inside the piston rod. The second end of the guide rod is provided with a limiting part. The limiting part and the guide rod are integrally constructed. The limiting part abuts against the end face of the piston rod axially and clamps the piston rod from both ends of the piston rod together with the reset plate.

7. An ejection mechanism for a die-casting mold, characterized in that, Includes the guide rod mounting structure as described in any one of claims 1-6.

8. The die-casting mold ejection mechanism according to claim 7, characterized in that, The first end of the guide rod is provided with an operating hole along the axial direction for cooperating with a wrench. The die-casting mold ejection mechanism also includes a slide block connected to the reset plate, and the slide block is provided with a recessed portion corresponding to the position of the guide rod. The recessed portion is used to avoid the wrench.

9. The die-casting mold ejection mechanism according to claim 7, characterized in that, The drive cylinder is a hydraulic cylinder and includes multiple cylinders spaced apart. The die-casting mold ejection mechanism also includes an oil inlet pipe and an oil outlet pipe. The oil inlet ends of the multiple drive cylinders are all connected to the oil inlet pipe, and the oil outlet ends of the multiple drive cylinders are all connected to the oil outlet pipe. The oil inlet pipe has an oil inlet port, and the oil outlet pipe has an oil outlet port.

10. A die-casting mold, characterized in that, Includes the die-casting mold ejection mechanism as described in any one of claims 7-9.

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