Expanding and contracting spinning lower die seat

Abstract

The utility model relates to hub manufacturing technical field, and disclose a kind of expansion and contraction type spinning lower die seat, it includes lower die seat body, several sliding blocks are radially movably connected with corresponding hub groove part position on lower die seat body, the profile of sliding block outer edge is made according to the contour of hub groove part, the ejector is movably connected with the center axis of lower die seat body, T type slide rail is provided on the ejector, T type slot is opened in the sliding block corresponding to the T type slide rail, T type slide rail is slidably fitted in T type slot, T type slide rail is relatively vertically direction and is arranged obliquely.The utility model is inclined plane transmission structure by ejector and sliding block, axial motion is converted into radial expansion and contraction, solve the demoulding problem caused by complex structure such as groove, negative angle in traditional structure, improve demoulding success rate and product qualification rate.Sliding block profile design can form accurate support into groove, realize controllable thinning of groove part, reduce material redundancy, effectively improve metal utilization, reduce production cost.

Description

Technical Field

[0001] This utility model relates to the field of wheel hub manufacturing technology, and in particular to a shrinking and retracting spinning lower die holder. Background Technology

[0002] In the production and processing of forged wheel hubs, the demand for grooved products continues to grow due to their structural characteristics. However, current spinning technology for grooved forged wheel hubs faces significant technical bottlenecks, primarily manifested in low metal material utilization. Specifically, in existing technologies, the spinning of grooved sections of forged wheel hubs is limited by the structural design of traditional spinning dies, making it impossible to achieve weight reduction in the grooved area using an extended processing scheme. Forcing an extended processing structure would prevent the wheel hub from easily demolding after processing, hindering effective material thinning in the grooved area and resulting in the unnecessary consumption of large amounts of metal, increasing production costs and reducing production efficiency. With the continuous expansion of market demand for grooved forged wheel hubs, improving the utilization rate of metal materials has become a key issue that needs to be addressed in the industry. The traditional spinning die structure can no longer meet the current production requirements for high efficiency, energy saving and low cost. It is urgent to achieve controllable weight reduction and smooth demolding of the grooved part through innovative structural design. Utility Model Content

[0003] The purpose of this utility model is to address the above-mentioned problems by providing an expansion and contraction type spinning die holder, and the technical solution adopted is as follows: A shrinkable spinning lower die base includes a lower die base body. Several sliding blocks are radially movably connected to the lower die base body corresponding to the hub groove. The outer edge of the sliding blocks is made according to the contour of the hub groove. An ejector is axially movably connected to the center of the lower die base body. The ejector is provided with a T-shaped slide rail. A T-shaped groove is opened on the sliding block corresponding to the T-shaped slide rail. The T-shaped slide rail slides in the T-shaped groove. The T-shaped slide rail is inclined relative to the vertical direction.

[0004] 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.

[0005] 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.

[0006] Preferably, the slope of the second T-shaped slide rail and the second T-shaped slide groove is greater than the slope of the T-shaped slide rail and the T-shaped slide groove.

[0007] Preferably, the T-shaped slide rail of the sliding block has an inclination angle of 5-8° relative to the vertical direction.

[0008] Preferably, the tilt angle of the second T-shaped slide rail relative to the vertical direction is 25-30°. The beneficial effects of this utility model are as follows: This invention utilizes a sloping transmission structure between the ejector and the sliding block to convert axial motion into radial expansion and contraction, solving the demolding problems caused by complex structures such as grooves and negative angles in traditional designs, thus improving demolding success rate and product qualification rate. The conformal design of the sliding block allows it to penetrate deep into the groove to form precise support, enabling controllable thinning of the groove area, reducing material redundancy, effectively improving metal utilization, and lowering production costs. The three-point symmetrical sliding block and sliding strip form a complete circumferential support, combined with a differentiated slope design of the double T-shaped slide rail, avoiding structural interference and improving spinning accuracy and product consistency. Attached Figure Description

[0009] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0010] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0011] Figure 2 for Figure 1 A cross-sectional view.

[0012] Figure 3 for Figure 1 Top view.

[0013] Figure 4 This is a schematic diagram of the structure of the present invention in the demolded state.

[0014] In the diagram: 10--lower mold base body; 11--shrinkage gap; 20--sliding block; 21--T-slot; 30--ejector; 31--T-slide rail; 32--second T-slide rail; 40--sliding bar; 41--second T-slot. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] like Figure 1-4As shown, a shrinkable spinning lower die base 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 shrinkage 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 principle of inclined plane transmission, 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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. The above-disclosed embodiments are merely specific examples of this utility model, but this utility model is not limited thereto. For those skilled in the art, any modifications made without departing from the principle of this utility model should be considered as protected by this utility model.

Claims

1. A shrinking-expansion type spinning die holder, characterized in that: The lower mold base body (10) includes a number of sliding blocks (20) that are radially movably connected to the lower mold base body (10) corresponding to the hub groove. The outer edge of the sliding block (20) is made according to the contour of the hub groove. The lower mold base body (10) is axially connected to an ejector (30). The ejector (30) is provided with a T-shaped slide rail (31). The sliding block (20) is provided with a T-shaped groove (21) 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.

2. The expansion and contraction type spinning die holder 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 expansion and contraction type spinning die holder 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 expansion and contraction type spinning die holder according to claim 3, characterized in that: The slope of the second T-shaped slide rail (32) and the second T-shaped slide groove is greater than the slope of the T-shaped slide rail (31) and the T-shaped slide groove.

5. The expansion and contraction type spinning die holder according to claim 1, characterized in that: The T-shaped slide rail (31) of the sliding block (20) has an inclination angle of 5-8° relative to the vertical direction.

6. The expansion and contraction type spinning die holder 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.

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