A spinning die lower die seat structure

Abstract

The application discloses a spinning die lower die seat structure and relates to the field of forged hub processing technology, aiming to solve the problems of difficult weight reduction and demolding of a traditional spinning lower die groove and complicated flash processing. The lower die seat comprises a lower die seat body, a material ejector, a sliding block and a flash shearing mechanism. The lower die seat body is provided with a radially movable sliding block corresponding to a hub groove. The material ejector drives the sliding block to extend or retract through a slope transmission, thereby realizing groove support and demolding avoidance. The flash shearing mechanism comprises a sliding hole, a push rod, a fan-shaped shearing cutter head and a return spring. The tail end of the push rod is provided with a wedge-shaped matching surface with the material ejector. When the material ejector rises, the push rod is pushed to drive the shearing cutter head to extend radially, thereby synchronously cutting off the rim flash. The return spring realizes the return of the push rod. The application forms an integrated linkage of "expansion-retraction demolding-flash cutting", does not need separate power configuration, improves metal utilization and processing efficiency, guarantees hub precision, is suitable for products of multiple specifications and is applicable to the spinning processing of groove-type forged hubs.

Description

Technical Field

[0001] This invention relates to the field of forged wheel hub processing technology, and in particular to a lower die base structure for a spinning die. Background Technology

[0002] In the production and processing of forged wheel hubs, grooved products have seen a continuous increase in market demand due to their structural advantages. However, current spinning technology for grooved forged wheel hubs suffers from problems such as low metal utilization, difficulty in demolding, and cumbersome flash treatment. First, in existing technologies, the spinning of the grooved part of forged wheel hubs is limited by the fixed structure of the traditional spinning die, making it impossible to use an extended processing scheme to achieve precise weight reduction in the grooved part. If an extended structure is forcibly designed, it will lead to the wheel hub being unable to be demolded smoothly after processing, creating a technical contradiction between "weight reduction requirements and demolding feasibility." Ultimately, this results in material redundancy in the grooved part and low metal utilization, which not only increases production costs but also reduces production efficiency. Second, during the wheel hub spinning process, the bottom of the rim is prone to forming annular flash due to metal flow. Traditional processes require removing burrs by cutting on a separate lathe or manually grinding after spinning and demolding. This not only adds extra steps and extends the production cycle, but may also damage the wheel rim precision due to positioning deviations during secondary clamping. In addition, setting up separate burr removal equipment requires additional investment, and the transfer between processes can easily cause wheel hub collisions, affecting the product qualification rate.

[0003] Therefore, the industry urgently needs an integrated technical solution that can simultaneously solve the problems of "groove weight reduction and demolding" and "efficient handling of flash," breaking through the limitations of traditional structures and achieving efficient, precise, and low-cost production and processing. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a lower die base structure for spinning dies. The technical solution adopted is as follows: A spinning die lower die base structure includes a lower die base body. Several sliding blocks are radially movably connected to the lower die base body corresponding to a wheel hub groove. The outer edges of the sliding blocks are conformally shaped to the contour of the wheel hub groove. An ejector is axially movably connected to the center of the lower die base body. The ejector is equipped with a T-shaped slide rail. T-slots are formed on the sliding blocks corresponding to the T-shaped slide rail, and the T-shaped slide rail slides within the T-slots. The T-shaped slide rail is inclined relative to the vertical direction. The structure also includes a shearing mechanism for removing the flash at the bottom of the wheel rim. The shearing mechanism includes a push rod driven by the ejector and a shearing blade fixedly connected to the push rod.

[0005] Preferably, there are three sliding blocks, which are symmetrically distributed at the center, and a contraction gap is reserved between adjacent sliding blocks to provide space for the radial retraction of the sliding blocks.

[0006] Preferably, the shrinkage gap has a wedge-shaped structure with a smaller outer diameter and a larger inner diameter. A sliding strip is movably connected within the shrinkage gap. The sliding strip can be closed with the sliding block to form a complete circumferential structure. An inclined second T-shaped groove is provided on the sliding strip. A second T-shaped slide rail is provided on the ejector corresponding to the second T-shaped groove. The second T-shaped slide rail and the second T-shaped groove are slidably engaged.

[0007] Preferably, the slope between the second T-shaped slide rail and the second T-shaped slide groove is greater than the slope between the T-shaped slide rail and the T-shaped slide groove.

[0008] Preferably, the T-shaped slide rail of the sliding block has an inclination angle of 5-8° relative to the vertical direction.

[0009] Preferably, the tilt angle of the second T-shaped slide rail relative to the vertical direction is 25-30°.

[0010] Preferably, the lower mold base body has a plurality of sliding holes evenly provided radially in the circumferential direction corresponding to the hub rim. A push rod is slidably connected in the sliding holes. A shearing head is fixedly connected to the front end of the push rod facing the side of the hub rim. The shearing head has a fan-shaped structure. The plurality of shearing heads are arranged circumferentially to form a complete annular head. The tail end of the push rod and the lower end of the ejector are machined with a wedge-shaped mating surface. The push rod and the ejector are connected by the wedge-shaped mating surface to achieve transmission.

[0011] Preferably, a return spring is provided in the sliding hole, with one end of the return spring abutting against the push rod and the other end abutting against the limiting boss fixedly connected to the lower mold base body. The beneficial effects of this invention are as follows: This invention overcomes the technical contradiction between groove weight reduction and demolding. Utilizing the inclined transmission structure of the ejector and sliding block, axial movement is converted into radial extension and retraction of the sliding block. This allows the sliding block to extend into the wheel hub groove to form precise support, enabling controllable thinning of the groove area to avoid material redundancy. During demolding, it can also retract to avoid material spillage, effectively solving the problem of traditional extended structures being unable to demold, improving metal material utilization, and reducing unnecessary consumption. Simultaneously, this invention achieves integrated "demolding-edge trimming" linkage. The flash trimming mechanism and ejector share a power source. Using the ejector's ejection action, the wedge-shaped mating surface drives the fan-shaped shearing head to extend radially, simultaneously completing the circumferential shearing of the wheel rim flash during demolding. No separate power unit or additional process is required, shortening the production cycle and avoiding the efficiency losses of traditional multi-process flow. In addition, the present invention has a compact and reliable structure with excellent adaptability and maintainability. The two mechanisms are integrated into the lower mold base body without occupying additional space. At the same time, different specifications of products can be adapted by changing the contour of the sliding block and the inner diameter of the shearing head. Furthermore, the present invention effectively reduces the risk of wheel hub damage. During demolding, the sliding block retracts to avoid hard friction. During flash shearing, the wheel hub is subjected to the combined action of "lifting force + shearing force" to ensure that the flash is easily removed and the wheel rim does not deform. There is no secondary clamping throughout the process, reducing bumps and positioning deviations, improving the wheel hub yield, and fully meeting the production needs of high efficiency, precision and low cost. Attached Figure Description

[0012] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0014] Figure 2 for Figure 1 A cross-sectional view.

[0015] Figure 3 for Figure 1 Top view.

[0016] Figure 4 This is a schematic diagram of the structure of the present invention in the demolded state.

[0017] Figure 5 This is a schematic diagram of a preferred embodiment of the present invention.

[0018] Figure 6 for Figure 5 AA view.

[0019] In the diagram: 10--Lower mold base body; 11--Shrinkage clearance; 12--Sliding hole; 20--Sliding block; 21--T-slot; 30--Ejector; 31--T-slide rail; 32--Second T-slide rail; 40--Sliding bar; 41--Second T-slot; 51--Push rod; 52--Shearing cutter head; 53--Wedge-shaped mating surface; 54--Reset spring; 55--Limiting boss. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] like Figure 1-6 As shown, a lower die base structure for spinning molds includes a lower die base body 10. Several sliding blocks 20 are radially movably connected to the lower die base body 10 corresponding to the wheel hub groove. The outer edges of the sliding blocks 20 are conformally shaped to the contour of the wheel hub groove, forming a support structure for the wheel hub groove and spokes. An ejector 30 is axially movably connected to the center of the lower die base body 10 for ejecting the spun product. The ejector 30 and the sliding blocks 20 form a transmission connection, converting the axial lifting motion of the ejector 30 into the radial expansion and contraction motion of the sliding blocks 20. This makes the radial dimension of the lower die base corresponding to the groove adjustable, thereby eliminating the mechanical obstruction of the groove to the wheel hub demolding. Specifically, the ejector 30 is provided with a T-shaped slide rail 31, and the sliding blocks 20 have T-shaped grooves 21 corresponding to the T-shaped slide rail 31. The T-shaped slide rail 31 slides within the T-shaped grooves 21. The T-shaped slide rail 31 is inclined relative to the vertical direction. Through the inclined plane transmission principle, the axial lifting and lowering movement of the top material device 30 can accurately drive the sliding block 20 to produce radial expansion and contraction.

[0022] During spinning, both the ejector 30 and the sliding block 20 are in their initial positions, serving as forming support structures for the groove and spoke areas of the wheel hub casting. During demolding, the power unit pushes the ejector 30 upwards, gradually lifting the wheel hub away from the lower mold base. During this process, as the ejector 30 rises, the inclined T-shaped slide rail 31 exerts a radially inward force on the T-shaped slide groove, pulling the sliding block 20 inwards synchronously. This reduces the radial dimension of the lower mold base body 10 corresponding to the wheel hub groove area, effectively avoiding the concave structure, complex grooves, and negative angle structures of the wheel hub, ensuring smooth demolding of the wheel hub without contact damage.

[0023] This embodiment achieves the linkage control of demolding action and radial shrinkage action through the inclined transmission structure of ejector 30 and sliding block 20, which solves the demolding problem of groove and negative angle parts in traditional structure, improves demolding success rate and spinning yield, reduces wheel hub damage rate and mold wear caused by demolding difficulty, and provides stable support for precise spinning of groove parts.

[0024] In a preferred embodiment, three sliding blocks 20 are provided, which are symmetrically distributed at the center, and a contraction gap 11 is reserved between adjacent sliding blocks 20 to provide sufficient space for the radial retraction of the sliding blocks 20. The three symmetrically distributed sliding blocks 20 can form a balanced radial support force, improving the positioning accuracy of the hub during the spinning process; the setting of the contraction gap 11 avoids structural interference when the sliding blocks 20 retract, ensuring the flexibility and reliability of the expansion and contraction action.

[0025] Preferably, the contraction gap 11 has a wedge-shaped structure with a smaller outer diameter and a larger inner diameter. A sliding strip 40 is movably connected within the contraction gap 11 to fill it. The sliding strip 40 can be closed with the sliding block 20 to form a complete circumferential structure, ensuring stable support throughout the entire circumference of the hub. The sliding strip 40 has an inclined second T-groove 41, and the ejector 30 has a corresponding second T-shaped slide rail 32. The second T-shaped slide rail 32 slides in conjunction with the second T-groove 41, and both are inclined in the vertical direction, allowing the lifting and lowering movement of the ejector 30 to simultaneously drive the sliding block 20 and the sliding strip 40 to achieve radial expansion and contraction. The wedge-shaped contraction gap 11 and the sliding strip 40 design solves the problem of local support loss caused by the gap in the sliding block 20, improving the spinning accuracy of the grooved area.

[0026] Preferably, to avoid motion interference between the sliding block 20 and the sliding bar 40, the slope of the second T-shaped slide rail 32 and the second T-shaped slide groove is set to be greater than the slope of the T-shaped slide rail 31 and the T-shaped slide groove. This makes the radial expansion and contraction speed of the sliding bar 40 greater than that of the sliding block 20, thereby avoiding the inward contraction space of the sliding block 20 and realizing the synchronous inward contraction of the sliding bar 40 and the sliding block 20. Through the differentiated slope design, the risk of motion interference between the sliding block 20 and the sliding bar 40 is eliminated, ensuring the orderly coordination of multiple components and improving the reliability and durability of the mechanism's motion.

[0027] Preferably, the T-shaped slide rail 31 of the sliding block 20 has an inclination angle of 5-8° relative to the vertical direction, and the second T-shaped slide rail 32 has an inclination angle of 25-30° relative to the vertical direction, so as to ensure that the movement speed of the sliding block 20 and the sliding bar 40 is in the optimal matching range, which ensures sufficient radial contraction and avoids a surge in driving force due to excessive angle, thus balancing the flexibility of the mechanism and the structural strength.

[0028] More preferably, the T-shaped slide rail 31 has an inclination angle of 6° relative to the vertical direction, and the second T-shaped slide rail 32 has an inclination angle of 27° relative to the vertical direction. This ensures smooth demolding while minimizing transmission energy consumption and improving the mechanism's response speed and service life. As a further optimized embodiment of the present invention, such as Figure 5-6 As shown, the expansion and contraction spinning lower die base also integrates a shearing mechanism, which includes a push rod 51 that is drivenly connected to the ejector and a shearing blade 52 that is fixedly connected to the push rod 51. This mechanism works in conjunction with the ejector to precisely remove the flash formed at the bottom of the wheel hub rim during the spinning process. Specifically, the lower die base body has a plurality of sliding holes 12 evenly opened radially in the circumferential direction corresponding to the wheel hub rim. Preferably, the number of sliding holes 12 is 3-6, preferably 4, to ensure balanced circumferential shearing force. The push rod 51 is slidably connected in the sliding hole 12, and the push rod 51 and the sliding hole 12 are clearance-fitted. The clearance is preferably 0.05-0.1mm to ensure smooth sliding of the push rod 51 without obvious radial wobble. The shearing blade 52 is fixedly connected to the front end of the push rod 51 facing the wheel hub rim, and the rear end extends into the lower die base body and is set corresponding to the lower end of the ejector.

[0029] The shearing head 52 has a fan-shaped structure, with the central angle of the fan matching the number of sliding holes 12 (e.g., 4 sliding holes 12 correspond to a 90° central angle). The cutting edge of the shearing head 52 faces the formation position of the flash at the bottom of the wheel hub rim, and the cutting edge angle is preferably 30-45° to ensure that the cutting edge can quickly cut into the flash during shearing and reduce shearing resistance. When the push rod 51 is in the initial position, several shearing heads 52 surround each other circumferentially to form a complete annular head, and the outer diameter of the annulus covers the circumference of the flash on the wheel rim. The shearing head 52 is preferably made of cemented carbide, which has high hardness and wear resistance, and is suitable for shearing metal flash.

[0030] The tail end of the push rod 51 and the lower end of the ejector are machined with wedge-shaped mating surfaces 53. The wedge-shaped mating surface 53 on the ejector side is an inclined surface, and the wedge-shaped mating surface 53 on the push rod 51 side is a matching inner inclined surface. The two achieve transmission engagement through surface contact. When the ejector moves up and down axially, the wedge-shaped mating surface 53 can convert the axial movement of the ejector into the radial extension and retraction of the push rod 51 along the sliding hole 12. Preferably, the inclination angle of the wedge-shaped mating surface 53 relative to the vertical direction is 15-25°.

[0031] Preferably, a return spring 54 is provided in the sliding hole 12. One end of the return spring 54 abuts against the push rod 51, and the other end abuts against the return spring 55 fixedly connected to the lower mold base body. Under normal conditions, the return spring 54 is in a compressed state, providing radially inward return force to the push rod 51, so that the shearing head 52 is kept in the initial retracted position.

[0032] The workflow of this implementation method is as follows: Spinning stage: The ejector and push rod 51 are both in the initial position, and the shearing head 52 surrounds and forms a ring, which fits the inner side of the wheel hub rim and does not interfere with the spinning process; Flash removal stage: After the wheel hub is spun, the ejector starts and rises axially. The wedge-shaped mating surface 53 at its lower end contacts the wedge-shaped mating surface 53 at the tail end of the push rod 51. As the ejector continues to rise, the wedge-shaped mating surface 53 generates a radially outward thrust, which overcomes the elastic force of the return spring 54 and pushes the push rod 51 to extend radially outward along the sliding hole 12, thereby driving the shearing head 52 to be ejected radially in sync. Under the action of radial thrust, the circular cutter head cuts into the flash at the bottom of the wheel hub rim, realizing synchronous circumferential shearing of the flash. During the shearing process, the wheel hub is simultaneously subjected to the upward lifting force of the ejector and the radial shearing force of the shearing head 52. The flash is more easily removed and detached under the combined action of "pull-shear", avoiding wheel hub rim deformation caused by a single shearing force. Reset and demolding stage: After the flash is removed, the ejector continues to rise, completely ejecting the hub from the lower mold base; when the ejector descends to reset, the reset spring 54 releases its elastic force, pulling the push rod 51 to retract radially inward, and the shearing head 52 returns to its initial position, waiting for the next processing cycle.

[0033] This implementation method achieves integrated demolding and trimming of wheel hubs, incorporating flash removal into the demolding process, reducing waiting time between processes, improving processing efficiency, significantly reducing the workload of subsequent manual grinding, and reducing material waste. The ejection action of the ejector serves as the power source for flash trimming, eliminating the need for separate motors, cylinders, or other power devices, and avoiding complex transmission control. The flash trimming mechanism is integrated into the lower mold base body, requiring no additional equipment space, and the wedge-shaped mating surface 53 transmission structure is simple and reliable. Furthermore, by replacing the shearing blades 52 with different inner diameters, it can adapt to the flash trimming needs of wheel hubs of different specifications, demonstrating strong versatility. The above-disclosed embodiments are merely specific examples of the present invention, but the present invention is not limited thereto. For those skilled in the art, any modifications made without departing from the principles of the present invention should be considered as protected by the present invention.

Claims

1. A lower die base structure for a spinning die, characterized in that: The system includes a lower mold base body (10), on which a plurality of sliding blocks (20) are radially movably connected to the wheel hub groove. The outer edge of the sliding blocks (20) is made according to the contour of the wheel hub groove. A ejector (30) is axially movably connected to the center of the lower mold base body (10). A T-shaped slide rail (31) is provided on the ejector (30). A T-shaped groove (21) is opened on the sliding block (20) corresponding to the T-shaped slide rail (31). The T-shaped slide rail (31) is slidably fitted in the T-shaped groove (21). The T-shaped slide rail (31) is inclined relative to the vertical direction. The system also includes a shearing mechanism for cutting off the flash at the bottom of the wheel rim. The shearing mechanism includes a push rod (51) that is drivenly connected to the ejector and a shearing head (52) that is fixedly connected to the push rod (51). The lower mold base body is provided with a number of sliding holes (12) evenly arranged radially in the circumferential direction of the hub rim. The push rod (51) is slidably connected in the sliding hole (12). The front end of the push rod (51) is fixedly connected to the shearing head (52) on the side facing the hub rim. The shearing head (52) is fan-shaped in general. The shearing heads (52) are arranged in a complete circular ring shape around the circumference. The tail end of the push rod (51) is machined with a wedge-shaped mating surface (53) corresponding to the lower end of the ejector. The push rod (51) and the ejector are connected by the wedge-shaped mating surface (53) to achieve transmission.

2. The lower die base structure of a spinning die according to claim 1, characterized in that: The sliding block (20) is provided in three parts, which are symmetrically distributed in the center, and a contraction gap (11) is reserved between adjacent sliding blocks (20) to provide the movement space for the radial retraction of the sliding block (20).

3. The lower die base structure of a spinning die according to claim 2, characterized in that: The contraction gap (11) has a wedge-shaped structure with a smaller outer diameter and a larger inner diameter. A sliding strip (40) is movably connected inside the contraction gap (11). The sliding strip (40) can be closed with the sliding block (20) to form a complete circumferential structure. An inclined second T-shaped groove (41) is provided on the sliding strip (40). A second T-shaped slide rail (32) is provided on the top feeder (30) corresponding to the second T-shaped groove (41). The second T-shaped slide rail (32) and the second T-shaped groove (41) slide together.

4. The lower die base structure of a spinning die according to claim 3, characterized in that: The slope of the second T-shaped slide rail (32) and the second T-shaped groove (41) is greater than the slope of the T-shaped slide rail (31) and the T-shaped groove (21).

5. The lower die base structure of a spinning die according to claim 1, characterized in that: The T-shaped slide rail (31) of the top feeder (30) has an inclination angle of 5-8° relative to the vertical direction.

6. The lower die base structure of a spinning die according to claim 3, characterized in that: The second T-shaped slide rail (32) has an inclination angle of 25-30° relative to the vertical direction.

7. The lower die base structure of a spinning die according to claim 1, characterized in that: A reset spring (54) is provided inside the sliding hole (12). One end of the reset spring (54) abuts against the push rod (51), and the other end abuts against the limiting boss (55) fixedly connected to the lower mold base body.

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