Wheel hub mold adjusting device and wheel hub mold applied thereto

Abstract

A wheel hub mold adjustment device and the wheel hub mold used therein, comprising a lower mold and a lower mold mounting plate, wherein the lower mold is connected to the lower mold mounting plate; characterized in that a central shaft is provided at the bottom of the lower mold, and a bottom hole is provided on the lower mold mounting plate for the central shaft to pass through, and further comprising a first adjusting sleeve and a second adjusting sleeve, wherein the central shaft is provided with an external thread, and the first adjusting sleeve and the second adjusting sleeve are provided with internal thread holes, the first adjusting sleeve and the second adjusting sleeve are movably screwed onto the central shaft, and the first adjusting sleeve and the second adjusting sleeve are respectively arranged on the upper and lower sides of the lower mold mounting plate; by adjusting the upper and lower positions of the first adjusting sleeve or the second adjusting sleeve, the first adjusting sleeve or the second adjusting sleeve can be connected to the lower mold mounting plate, thereby driving the central shaft to move up and down, and the central shaft in turn causes the middle area of ​​the lower mold to produce an upward convex or downward concave pre-deformation; the pre-deformation of the mold offsets the deformation of the mold during wheel hub forming, which is beneficial to improving the yield of wheel hub products.

Description

Technical Field

[0001] This invention relates to the technical field of mold structure, and in particular to a lower mold adjustment device for a wheel hub mold. Background Technology

[0002] Casting is a common forming method for wheel products. The machining accuracy of wheel products is mainly affected by the machining accuracy of the wheel casting mold and the deformation of the mold during the casting process. The machining accuracy of the mold can be improved by using high-precision machining equipment, while the deformation of the mold during casting is related to the mold material, temperature gradient, and constraint conditions. The impact of mold deformation on the dimensions of wheel products is mainly manifested in axial deformation. When the axial deformation of the wheel product exceeds the set tolerance, the wheel product will be scrapped. To control the deformation of the casting mold, the applicant previously applied for related patent technology. Chinese utility model patent CN210548002U discloses a lower mold locking structure and the wheel hub mold used therein, including a lower mold for forming a workpiece manufacturing cavity and a lower mold mounting plate for fixing the lower mold; a molten inlet is provided on the lower mold, which connects to the workpiece manufacturing cavity and is used to supply molten metal to the workpiece manufacturing cavity; the outer edge of the lower mold rests on the lower mold mounting plate; an upper connecting area is also provided on the lower mold, which is located between the molten inlet and the outer edge of the lower mold; a lower connecting area is provided on the lower mold mounting plate; and a locking connection mechanism is provided between the upper connecting area and the lower connecting area, which is used to lock the upper connecting area of ​​the lower mold to the lower connecting area of ​​the lower mold mounting plate. Specifically, the locking connection mechanism includes a threaded connection hole with internal threads on the upper connection area, a light connection hole on the lower connection area, and a connecting bolt, which passes through the light connection hole and is locked to the threaded connection hole.

[0003] This locking connection mechanism can appropriately offset the thermal stress formed in the lower mold during the production process, reducing the upward deformation of the lower mold under thermal stress and improving the dimensional accuracy of the wheel hub product to a certain extent. While the locking connection mechanism fixes the lower mold to the lower mold mounting plate to reduce vertical deformation, in actual use, the lower mold's central temperature is high, causing it to bulge upwards. Later in the casting process, as the mold cools and stress is gradually released, the central part of the lower mold will sink downwards. Ultimately, the finished wheel hub product still exhibits significant axial deformation in the central area. Therefore, existing technology can no longer adequately meet the needs of practical use. Summary of the Invention

[0004] To overcome the problem of axial deformation of wheel hub products caused by lower mold deformation during wheel hub mold production in existing technologies, this invention proposes a wheel hub mold adjustment device, including a lower mold and a lower mold mounting plate, wherein the lower mold is connected to the lower mold mounting plate; a central shaft is provided at the bottom of the lower mold, and a bottom hole is provided on the lower mold mounting plate to allow the central shaft to pass through; the device also includes a first adjusting sleeve and a second adjusting sleeve, wherein the central shaft is provided with an external thread, and the first adjusting sleeve and the second adjusting sleeve are provided with internal thread holes; the first adjusting sleeve and the second adjusting sleeve are movably screwed onto the central shaft, and the first adjusting sleeve and the second adjusting sleeve are respectively arranged on the upper and lower sides of the lower mold mounting plate; by adjusting the upper and lower positions of the first adjusting sleeve or the second adjusting sleeve, the first adjusting sleeve or the second adjusting sleeve can be connected to the lower mold mounting plate, thereby driving the central shaft to move up and down, and the central shaft thereby causing the middle area of ​​the lower mold to undergo upward convex or downward concave pre-deformation.

[0005] The wheel hub mold is a mold-making device used for casting aluminum alloy wheels. A typical wheel hub mold includes an upper mold, a lower mold, and a side mold positioned between the upper and lower molds. These molds form the cavity of the wheel hub. For ease of fixing and movement, the wheel hub mold also includes an upper mold mounting plate and a lower mold mounting plate, which are respectively fixedly connected to the upper mold mounting plate and the lower mold mounting plate. During wheel hub casting, the molten aluminum alloy reaches very high temperatures, requiring cooling of the upper mold, lower mold, and side molds to improve processing efficiency. Therefore, a certain cooling space is generally provided between the lower mold and the lower mold mounting plate, and between the upper mold and the upper mold mounting plate. Taking the lower mold as an example, the lower mold is shaped like an inverted bowl, with a lower mold bottom wall and a lower mold side wall. The lower mold side wall is connected to the lower mold mounting plate by a nut.

[0006] The central shaft is a columnar component located in the middle of the bottom wall of the lower mold. The central shaft is positioned directly opposite the central axis of the wheel hub, and it has external threads for connecting to other components. In this embodiment, the central shaft also has a feed hole communicating with the wheel hub cavity, through which high-temperature aluminum alloy can be injected into the wheel hub cavity.

[0007] The bottom hole is a through hole provided on the lower mold mounting plate, which allows the lower end of the central shaft on the lower mold to pass through.

[0008] The first and second adjusting sleeves are bushing-shaped components with threaded holes, which can be threaded onto the central shaft. Their positions on the central shaft can be easily adjusted by rotating the first and second adjusting sleeves. To facilitate rotation, the outer walls of the first and second adjusting sleeves are provided with several planes for connecting to a wrench (commonly, 2, 4, or 6 planes are used), allowing for convenient adjustment of their positions using a wrench.

[0009] The first and second adjusting sleeves are positioned on the upper and lower sides of the lower mold mounting plate, respectively, so that they can abut against the upper and lower sides of the lower mold mounting plate, thereby exerting a tensioning or pushing force on the central shaft. Taking the first adjusting sleeve positioned on the upper side of the lower mold mounting plate and the second adjusting sleeve positioned on the lower side of the lower mold mounting plate as an example, the adjustment methods are explained in detail below: The first method is an upward pushing adjustment method. First, the first adjusting sleeve is installed on the central shaft and adjusted to the set position. Then, the lower mold is installed and connected to the lower mold mounting plate. During the installation of the lower mold and the lower mold mounting plate, the upper side of the lower mold mounting plate first fits against the first adjusting sleeve. As the lower mold and the lower mold mounting plate tighten, the lower mold mounting plate can apply an upward pushing force to the first adjusting sleeve. Under the upward pushing force of the lower mold mounting plate, the first adjusting sleeve moves the central shaft upward, and the central shaft then pushes the middle area of ​​the lower mold to produce an upward protrusion pre-deformation. The second method is a downward tension adjustment. First, the first adjustment sleeve is installed on the central shaft and adjusted to the set position. Then, the lower mold is installed and connected to the lower mold mounting plate. At this time, there is a gap between the upper side of the lower mold mounting plate and the first adjustment sleeve. Then, the second adjustment sleeve is installed below the lower side of the lower mold mounting plate. By continuing to screw the second adjustment sleeve, the second adjustment sleeve presses against the lower side of the lower mold mounting plate. The central shaft is subjected to the downward tension force of the second adjustment sleeve. The central shaft can then move the first adjustment sleeve downward and cause the middle area of ​​the lower mold to undergo a concave pre-deformation.

[0010] The central region of the lower mold refers to the wall on the bottom wall of the lower mold that is connected to the central shaft and is within a certain diameter range. This part of the wall corresponds to the wheel core and spokes of the wheel hub product. The deformation of the central region of the lower mold will affect the axial dimension of the wheel hub product.

[0011] According to the above technical solution, compared with the prior art, the beneficial technical effects of the present invention are as follows: First, by allowing the first adjusting sleeve or the second adjusting sleeve to contact the lower mold mounting plate, that is, by connecting and fixing the lower mold and the lower mold mounting plate together through the first adjusting sleeve or the second adjusting sleeve, the middle area of ​​the lower mold is fixed and supported, which helps to reduce the deformation of the lower mold during wheel hub forming, thereby reducing the axial deformation of the wheel hub product; Second, by adjusting the number of rotations of the first adjusting sleeve or the second adjusting sleeve, the central shaft can be pushed or pulled, thereby causing the middle area of ​​the lower mold to produce an upward convex or downward concave pre-deformation. The pre-deformation of the mold offsets the deformation of the mold during wheel hub forming, ensuring that the axial dimension of the wheel hub after forming is within the tolerance range, which helps to improve the yield of wheel hub products.

[0012] To improve installation convenience, a further technical solution is that the lower mold mounting plate includes a pressure plate, which is detachably connected to the bottom hole of the lower mold mounting plate. The pressure plate has a through hole that allows the central shaft to pass through. The first adjusting sleeve or the second adjusting sleeve can be connected to the pressure plate to drive the central shaft to move up and down. In this technical solution, the diameter of the bottom hole of the lower mold mounting plate is larger than the outer diameter of the first adjusting sleeve, meaning the first adjusting sleeve can freely pass through the bottom hole of the lower mold mounting plate. The through hole of the pressure plate, while allowing the central shaft to pass through, must have a diameter smaller than the outer diameter of the first adjusting sleeve. Thus, after the pressure plate is installed on the lower mold mounting plate, the first adjusting sleeve can press against the upper push surface of the pressure plate. After adding the pressure plate, the adjustment method of the first adjusting sleeve is improved. The specific adjustment method is as follows: The first method is an upward pushing adjustment method. First, the lower mold is installed and fixed on the lower mold mounting plate. The central axis passes downward through the bottom hole of the lower mold mounting plate. Then, the first adjusting sleeve is installed on the central axis and adjusted to the set position. Then, the pressure plate is installed and connected to the bottom hole of the lower mold mounting plate. During the installation of the pressure plate and the lower mold mounting plate, the upper pushing surface of the pressure plate first fits and connects with the first adjusting sleeve. As the pressure plate and the lower mold mounting plate tighten continuously, the pressure plate can apply an upward pushing force to the first adjusting sleeve. Under the upward pushing force of the pressure plate, the first adjusting sleeve moves upward with the central axis. The central axis then pushes the middle area of ​​the lower mold to produce an upward protrusion pre-deformation. The second method is a downward tension adjustment. First, the first adjustment sleeve is installed on the central shaft and adjusted to the set position. Then, the pressure plate is installed and connected to the bottom hole of the lower mold mounting plate. At this time, there is a gap between the upper pushing surface of the pressure plate and the first adjustment sleeve. Then, the second adjustment sleeve is installed on the lower pushing surface of the pressure plate. By continuing to screw the second adjustment sleeve, the second adjustment sleeve presses against the lower side of the lower mold mounting plate. The central shaft is subjected to the downward tension force of the second adjustment sleeve. The central shaft can then move the first adjustment sleeve downward and cause the middle area of ​​the lower mold to undergo a concave pre-deformation.

[0013] To minimize movement of the lower mold's central axis after it has been positioned, a further technical solution is to adjust the second or first adjusting sleeve to press it against the other side of the pressure plate after the first or second adjusting sleeve is connected to the pressure plate and adjusted to a preset position. By pressing the first and second adjusting sleeves against both sides of the pressure plate, the two adjusting sleeves clamp the pressure plate, effectively reducing the axial movement of the central axis and improving the axial stability of the lower mold.

[0014] Furthermore, in order to enable the central region of the lower mold to undergo greater deformation at room temperature, an annular groove is provided on the bottom wall of the lower mold. The specific arrangement of the annular groove includes at least two or a combination of the following two.

[0015] In the first arrangement, the lower mold includes a lower mold bottom wall and a lower mold side wall arranged along the edge of the lower mold bottom wall. An annular groove is also provided on the lower mold, and the annular groove is arranged on the lower mold bottom wall area between the lower mold side wall and the central axis.

[0016] In the second arrangement, the lower mold includes a lower mold bottom wall and a lower mold side wall arranged along the edge of the lower mold bottom wall. An annular groove is also provided on the lower mold, and the annular groove is arranged at the junction of the lower mold bottom wall and the lower mold side wall and / or at the junction of the lower mold bottom wall and the lower mold bottom wall with the central axis.

[0017] A further technical solution could be that several clearance grooves are provided on the inner threaded hole walls of the first and second adjusting sleeves. Providing these clearance grooves serves two purposes: first, it reduces the contact area between the first and second adjusting sleeves; second, it allows heat to dissipate from the clearance grooves, which is beneficial for mold heat dissipation.

[0018] The wheel hub mold using the lower mold locking structure includes the lower mold, an upper mold located above the lower mold, and a side mold disposed between the upper mold and the lower mold. The lower mold, the upper mold, and the side mold form a cavity for the wheel hub.

[0019] Because of the above-mentioned features and advantages, this invention can be applied to wheel hub mold adjustment devices and wheel hub molds in which they are applied. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the axial structure of the hub mold;

[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of the wheel hub mold from the front view.

[0022] Figure 3 This is an exploded structural diagram of the hub mold adjustment device;

[0023] Figure 4 This is a frontal cross-sectional view of the lower mold, showing the downward tensioned state;

[0024] Figure 5 This is a frontal cross-sectional view of the lower mold, showing the upward pushing state;

[0025] Figure 6 This is a schematic diagram of the axial structure of the first adjusting sleeve;

[0026] Figure 7 This is a schematic diagram of the axial side structure of the pressure plate;

[0027] Figure 8 This is a frontal cross-sectional view of the lower mold, showing the connection relationship between the first adjusting sleeve, the second adjusting sleeve, and the lower mold mounting plate. Implementation

[0028] The following description, in conjunction with the accompanying drawings, further illustrates the structure of the wheel hub mold adjustment device and the wheel hub mold to which the present invention is applied.

[0029] Except where explicitly stated that they are equivalent or alternative implementation schemes, the various implementation details disclosed below may be selectively applied or combined in one embodiment even if they are not directly related or synergistic in terms of function.

[0030] like Figure 1 and Figure 2 As shown, the wheel hub mold proposed in this invention includes a lower mold 11, an upper mold 12 located above the lower mold 11, and a side mold 13 disposed between the upper mold 12 and the lower mold 11. The lower mold 11, the upper mold 12, and the side mold 13 form a cavity 10 for the wheel hub. For ease of fixing and moving, the wheel hub mold also includes an upper mold mounting plate 15 and a lower mold mounting plate 14. The upper mold 12 is fixedly connected to the upper mold mounting plate 15, and the lower mold 11 is fixedly connected to the lower mold mounting plate 14. During wheel hub casting, the molten aluminum alloy reaches very high temperatures, requiring cooling of the upper mold 12, the lower mold 11, and the side mold 13 to improve processing efficiency. Therefore, a certain gap is generally left between the lower mold 11 and the lower mold mounting plate 14, and between the upper mold 12 and the upper mold mounting plate 15, to facilitate the installation of cooling devices.

[0031] like Figure 3 and Figure 4As shown, the lower mold 11 is in the shape of an inverted bowl, and has a lower mold bottom wall 111 and a lower mold side wall 112 arranged along the edge of the lower mold bottom wall 111. The lower mold side wall 112 is connected to the lower mold mounting plate 14 by a fixing nut. To overcome the problem of axial deformation of wheel products caused by deformation of the lower mold 11 during wheel hub mold production in the prior art, a central shaft 2 is provided at the bottom of the lower mold 11, and a bottom hole 16 is provided on the lower mold mounting plate 14 to allow the central shaft 2 to pass through. It also includes a first adjusting sleeve 3 and a second adjusting sleeve 4. The central shaft 2 is provided with external threads, and the first adjusting sleeve 3 and the second adjusting sleeve 4 are provided with internal thread holes. The first adjusting sleeve 3 and the second adjusting sleeve 4 are movably screwed onto the central shaft 2, and the first adjusting sleeve 3 and the second adjusting sleeve 4 are respectively arranged on the upper and lower sides of the lower mold mounting plate 14. By adjusting the upper and lower positions of the first adjusting sleeve 3 or the second adjusting sleeve 4, the first adjusting sleeve 3 or the second adjusting sleeve 4 can be connected to the lower mold mounting plate 14 to drive the central shaft 2 to move up and down. The central shaft 2 then causes the middle area of ​​the lower mold 11 to undergo upward convex or downward concave pre-deformation. This setup has several advantages: First, by connecting the first adjusting sleeve 3 or the second adjusting sleeve 4 to the lower mold mounting plate 14, i.e., by connecting and fixing the lower mold 11 to the lower mold mounting plate 14 through the first adjusting sleeve 3 or the second adjusting sleeve 4, the central area of ​​the lower mold 11 is fixed and supported, which helps to reduce the deformation of the lower mold 11 during wheel hub forming, thereby reducing the axial deformation of the wheel hub product. Second, by adjusting the number of rotations of the first adjusting sleeve 3 or the second adjusting sleeve 4, the central shaft 2 can be pushed or pulled, causing the central area of ​​the lower mold 11 to undergo a pre-deformation that is either convex or concave. This pre-deformation of the mold offsets the deformation of the mold during wheel hub forming, ensuring that the axial dimensions of the formed wheel hub are within the tolerance range, which helps to improve the yield of the wheel hub product.

[0032] Among them, the first adjusting sleeve 3 and the second adjusting sleeve 4 are bushing-shaped components with connecting threaded holes, such as... Figure 3 and Figure 6 As shown, the first adjusting sleeve 3 and the second adjusting sleeve 4 can be threaded onto the central shaft 2. Their positions on the central shaft 2 can be easily adjusted by rotating the first adjusting sleeve 3 and the second adjusting sleeve 4 with the aid of a wrench or socket. The central shaft 2 is also provided with a feed hole 17 communicating with the hub cavity, through which high-temperature aluminum alloy can be injected into the hub cavity.

[0033] Furthermore, the first adjusting sleeve 3 and the second adjusting sleeve 4 are respectively arranged on the upper and lower sides of the lower mold mounting plate 14 so that the first adjusting sleeve 3 and the second adjusting sleeve 4 can respectively abut against the upper and lower side walls of the lower mold mounting plate 14, thereby forming a tensioning or pushing force on the central shaft 2 and the lower mold 11. The tensioning and pushing states are explained below: Figure 8 As shown, the first adjustment method is an upward pushing adjustment. First, the first adjusting sleeve 3 is installed on the central shaft 2 and adjusted to the set position. Then, the lower mold 11 is installed and connected to the lower mold mounting plate 14. In order to generate an upward pushing force, the set position mentioned here is that the lower surface of the first adjusting sleeve 3 is slightly lower than the upper side 141 of the lower mold mounting plate 14 installed later. During the installation of the lower mold 11 and the lower mold mounting plate 14, the upper side 141 of the lower mold mounting plate 14 first fits and connects with the first adjusting sleeve 3. As the lower mold 11 and the lower mold mounting plate 14 are continuously tightened, the lower mold mounting plate 14 can apply an upward pushing force to the first adjusting sleeve 3. Under the upward pushing force of the lower mold mounting plate 14, the first adjusting sleeve 3 moves upward with the central shaft 2. The central shaft 2 then pushes the middle area of ​​the lower mold 11 to generate an upward protrusion pre-deformation, the pre-deformation amount being H1. The second adjustment method is a downward tensioning method. First, the first adjusting sleeve 3 is installed on the central shaft 2 and adjusted to the set position. Then, the lower mold 11 is installed and connected to the lower mold mounting plate 14. In order for the second adjusting sleeve 4 to pull down the central shaft 2, the set position is such that the lower surface of the first adjusting sleeve 3 is slightly higher than the upper side 141 of the lower mold mounting plate 14 installed later. At this time, there is a gap between the upper side 141 of the lower mold mounting plate 14 and the first adjusting sleeve 3. Then, the second adjusting sleeve 4 is installed below the lower side 142 of the lower mold mounting plate 14. By screwing the second adjusting sleeve 4, the second adjusting sleeve 4 presses against the lower side 142 of the lower mold mounting plate 14. By continuing to screw the second adjusting sleeve 4, the second adjusting sleeve 4 applies a downward tensioning force to the central shaft 2. The central shaft 2 can then move the first adjusting sleeve 3 downward and cause the middle area of ​​the lower mold 11 to undergo a concave pre-deformation, the pre-deformation amount being H2.

[0034] To improve the ease of installation of the lower mold mounting plate 14 and the two adjusting sleeves, such as Figure 4 , Figure 5 and Figure 7As shown, the lower mold mounting plate 14 includes a pressure plate 5, which is detachably connected to the bottom hole 16 of the lower mold mounting plate 14. The pressure plate 5 is provided with a pressure plate through hole 50 that allows the central shaft 2 to pass through. The first adjusting sleeve 3 or the second adjusting sleeve 4 can be connected to the pressure plate 5 to drive the central shaft 2 to move up and down. In this technical solution, the diameter of the bottom hole 16 of the lower mold mounting plate 14 is larger than the outer diameter of the first adjusting sleeve 3, that is, the first adjusting sleeve 3 can freely pass through the bottom hole 16 of the lower mold mounting plate 14; while the through hole of the pressure plate 5 is required to be smaller than the outer diameter of the first adjusting sleeve 3 while allowing the central shaft 2 to pass through. In this way, after the pressure plate 5 is installed on the lower mold mounting plate 14, the first adjusting sleeve 3 can press on the upper pushing surface 51 of the pressure plate 5. The advantage of this setup is that during installation, the lower mold 11 can be first installed and fixed onto the lower mold mounting plate 14, and then the first adjusting sleeve 3, the pressure plate 5, and the second adjusting sleeve 4 can be installed in sequence. This connection method facilitates the position adjustment of the first adjusting sleeve 3 and the second adjusting sleeve 4, as well as the connection and installation of the lower mold mounting plate 14.

[0035] After adding the pressure plate 5, the adjustment method of the first adjusting sleeve 3 is improved to some extent. The specific adjustment methods are as follows: The first method is an upward pushing adjustment method, such as... Figure 5 As shown, first, the lower mold 11 is installed and fixed onto the lower mold mounting plate 14. The central shaft 2 passes downward through the bottom hole 16 of the lower mold mounting plate 14. Then, the first adjusting sleeve 3 is installed onto the central shaft 2 and adjusted to a set position. Finally, the pressure plate 5 is installed and connected to the bottom hole 16 of the lower mold mounting plate 14. Similarly, in order to generate an upward thrust, the set position mentioned here is that the lower surface of the first adjusting sleeve 3 is slightly lower than the upper thrust surface 51 of the pressure plate 5 installed later. During the installation process of the pressure plate 5 and the lower mold mounting plate 14, the upper thrust surface 51 of the pressure plate 5 first fits and connects with the first adjusting sleeve 3. As the pressure plate 5 and the lower mold mounting plate 14 are tightened, the pressure plate 5 can apply an upward thrust force to the first adjusting sleeve 3. Under the upward thrust force of the pressure plate 5, the first adjusting sleeve 3 moves upward with the central shaft 2. The central shaft 2 then pushes the middle area of ​​the lower mold 11 to produce an upward protrusion pre-deformation, the pre-deformation amount being H1. The second type is the downward tightening adjustment method, such as... Figure 4As shown, firstly, the first adjusting sleeve 3 is installed onto the central shaft 2 and adjusted to the set position. Then, the pressure plate 5 is installed and connected to the bottom hole 16 of the lower mold mounting plate 14. In order for the second adjusting sleeve 4 to pull down the central shaft 2, the set position is such that the lower surface of the first adjusting sleeve 3 is slightly higher than the upper pushing surface 51 of the pressure plate 5 installed later. At this time, there is a gap between the upper pushing surface 51 of the pressure plate 5 and the first adjusting sleeve 3. Then, the second adjusting sleeve 4 is installed on the lower pushing surface 52 of the pressure plate 5. By continuing to screw the second adjusting sleeve 4, the second adjusting sleeve 4 presses against the lower side surface 142 of the lower mold mounting plate 14. The central shaft 2 is subjected to the downward tension force of the second adjusting sleeve 4, and the central shaft 4 can move the first adjusting sleeve 3 down and cause the middle area of ​​the lower mold 11 to undergo a concave pre-deformation, the pre-deformation amount being H2.

[0036] Furthermore, the connection method between the pressure plate 5 and the lower mold mounting plate 14 is also diverse, such as... Figure 4 and Figure 5 As shown, one method involves fixing the platen 5 with several screws; another method involves an internal thread in the bottom hole 16 of the lower mold mounting plate 14, and the pressure plate 5 being cylindrical with external threads. The pressure plate 5 and the lower mold mounting plate 14 are connected together by threads. This threaded connection allows the pressure plate 5 to be adjusted vertically. Thus, the first adjusting sleeve 3, initially installed on the central shaft 2, does not need precise vertical adjustment to a set position under both pushing and tightening conditions. Instead, it only needs to be adjusted to a fixed position, and then the pushing or separating state can be achieved by adjusting the position of the pressure plate 5, which is very convenient.

[0037] A further technical solution is that after the first adjusting sleeve 3 or the second adjusting sleeve 4 is connected to the pressure plate 5 and adjusted to a preset position, the second adjusting sleeve 4 or the first adjusting sleeve 3 is then adjusted to press against the other side of the pressure plate 5. In this way, the central shaft 2 of the lower mold 11 can be firmly connected to the lower mold mounting plate 14 through the two adjusting sleeves, greatly reducing the axial movement of the central shaft 2.

[0038] Furthermore, in order to enable the central region of the lower mold 11 to undergo greater deformation at room temperature, an annular groove 6 is provided on the bottom wall of the lower mold 11. The specific arrangement of the annular groove 6 includes at least two or a combination of the following two.

[0039] In the first arrangement, the lower mold 11 includes a lower mold bottom wall 111 and a lower mold side wall 112 arranged along the edge of the lower mold bottom wall 111. An annular groove 6 is also provided on the lower mold 11, and the annular groove 6 is arranged on the bottom wall area between the lower mold bottom wall 111 and the central axis 2.

[0040] The second arrangement method, such as Figure 4 and Figure 5 As shown, the lower mold 11 includes a lower mold bottom wall 111 and a lower mold side wall 112 arranged along the edge of the lower mold bottom wall 111. An annular groove 6 is also provided on the lower mold 11. The annular groove 6 is arranged at the junction of the lower mold bottom wall 111 and the lower mold side wall 112 and / or at the junction of the lower mold bottom wall 111 and the junction of the bottom wall and the central axis 2.

[0041] A further technical solution could be that a plurality of clearance grooves 7 are provided on the inner threaded hole walls of the first adjusting sleeve 3 and the second adjusting sleeve 4. Providing the clearance grooves 7 has two functions: first, it reduces the contact area between the first adjusting sleeve 3 and the second adjusting sleeve 4; second, it allows heat to dissipate from the clearance grooves 7, which is beneficial for heat dissipation of the mold.

Claims

1. A wheel hub mold adjustment apparatus comprising a lower mold and a lower mold mounting plate, said lower mold being attached to said lower mold mounting plate; characterized by, The bottom of the lower mold is provided with a central shaft, and the lower mold mounting plate is provided with a bottom hole through which the central shaft can pass. It also includes a first adjusting sleeve and a second adjusting sleeve. The central shaft is provided with an external thread, and the first adjusting sleeve and the second adjusting sleeve are provided with internal thread holes. The first adjusting sleeve and the second adjusting sleeve are movably screwed onto the central shaft, and the first adjusting sleeve and the second adjusting sleeve are respectively arranged on the upper and lower sides of the lower mold mounting plate. By adjusting the upper and lower positions of the first adjusting sleeve or the second adjusting sleeve, the first adjusting sleeve or the second adjusting sleeve can abut against the lower mold mounting plate, thereby driving the central shaft to move up and down. The central shaft then causes the middle area of ​​the lower mold to produce an upward convex or downward concave pre-deformation.

2. The wheel hub mold adjustment device of claim 1, wherein, The lower mold mounting plate includes a pressure plate, which is detachably connected to the bottom hole of the lower mold mounting plate. The pressure plate is provided with a pressure plate through hole that allows the central shaft to pass through. The first adjusting sleeve or the second adjusting sleeve can abut against the pressure plate to drive the central shaft to move up and down.

3. The wheel hub mold adjustment device of claim 2, wherein, After the first adjusting sleeve abuts against the pressure plate and is adjusted to a preset position, the second adjusting sleeve is then adjusted to press against the other side of the pressure plate.

4. The wheel hub mold adjustment device of claim 1, 2, or 3, wherein, The lower mold includes a lower mold bottom wall and a lower mold side wall arranged along the edge of the lower mold bottom wall. An annular groove is also provided on the lower mold, and the annular groove is arranged on the lower mold bottom wall area between the lower mold side wall and the central axis.

5. The wheel hub mold adjustment device of claim 1, 2, or 3, wherein, The lower mold includes a lower mold bottom wall and a lower mold side wall arranged along the edge of the lower mold bottom wall. An annular groove is also provided on the lower mold, and the annular groove is arranged at the junction of the lower mold bottom wall and the lower mold side wall and / or at the junction of the lower mold bottom wall and the lower mold bottom wall with the central axis.

6. The wheel hub mold adjustment device of claim 1, 2, or 3, wherein, The lower mold is provided with a feed hole, which is located on the central shaft.

7. The hub mold adjusting device according to claim 6, characterized in that, The inner threaded holes of the first and second adjusting sleeves are provided with several clearance grooves.

8. A wheel hub mold using the wheel hub mold adjustment device according to any one of claims 1 to 7, characterized in that, It includes the lower mold, the upper mold located above the lower mold, and the side mold disposed between the upper mold and the lower mold, wherein the lower mold, the upper mold and the side mold form a cavity for a wheel hub.

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