Reverse rim spinning die

Abstract

The utility model provides a reverse rim spinning die, which belongs to the technical field of spinning dies and comprises an upper die and a lower die, a pressure plate is mounted on the upper die, a spinning die core is mounted on the lower die, the pressure plate is positioned above the spinning die core, a liftable ejection shaft is longitudinally arranged in the middle of the spinning die core, and a plurality of movable blocks are circumferentially arranged at the upper end of the spinning die core. The outer side faces of the multiple movable blocks jointly form a shape follow-up face matched with the inner side of a hub, multiple guide assemblies are obliquely arranged in the circumferential direction of the spinning mold core, the multiple movable blocks are arranged at the upper ends of the multiple guide assemblies in a one-to-one correspondence mode, and the guide assemblies incline inwards from bottom to top and have axial displacement. According to the reverse rim spinning die provided by the utility model, smooth demolding of a hub blank can be realized by virtue of ascending gathering and descending dispersion of the plurality of movable blocks, a pattern draft does not need to be designed on the inner side surface of the hub blank, the machining amount of the inner side of the hub blank is reduced, and the utilization rate of a blank material and the machining efficiency are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of spinning molds, and more specifically relates to a reverse rim spinning mold. Background Art

[0002] With the rapid development of the automotive industry, the requirements for precision, strength, and lightweight automotive parts are increasing. Spinning technology is a key forming method in wheel hub manufacturing. It is commonly used to manufacture rotating parts such as wheels. Through rotation and pressure, the metal material is forced to conform to the mold and form the desired shape. A reverse rim spinning die is a tool specifically designed for machining the inner side of the wheel hub—the inner structure of the wheel hub, commonly referred to as the inner side of the rim.

[0003] However, in order to ensure that the wheel hub blank can be smoothly demolded after spinning, the existing reverse rim draft spinning mold usually designs a draft angle on the inner side of the wheel hub blank. This will result in a large amount of processing on the inner side of the wheel hub blank, leading to low blank material utilization and slow machining efficiency. Utility Model Content

[0004] The utility model aims to provide a reverse rim spinning die, aiming to solve the problems of low blank material utilization and slow machining efficiency.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a reverse rim spinning mold, including an upper mold and a lower mold, the upper mold is equipped with a pressure plate, the lower mold is equipped with a spinning mold core, the pressure plate is located above the spinning mold core, and the middle part of the spinning mold core is longitudinally provided with a liftable ejector shaft, the upper end of the spinning mold core is circumferentially provided with a plurality of movable blocks, the outer side surfaces of the plurality of movable blocks together constitute a conformal surface adapted to the inner side of the wheel hub, the spinning mold core is circumferentially inclined with a plurality of guide assemblies, the plurality of movable blocks are arranged one by one at the upper ends of the plurality of guide assemblies, the guide assemblies are inclined inwardly from bottom to top and have axial displacement, the guide assemblies drive the movable blocks to rise and gather inward or descend and disperse outward.

[0006] In a possible implementation, the plurality of movable blocks form a circular ring structure in a folded state, and a clearance hole for evading the upper end of the ejection shaft is formed in the middle of the circular ring structure.

[0007] In a possible implementation, an ejector plate is horizontally fixedly provided on the upper end of the ejector shaft, and the ejector shaft is used to eject the hub blank upward with the help of the ejector plate.

[0008] In a possible implementation, a plurality of lifting portions are provided in the circumferential direction of the ejection shaft, and the lifting portions extend radially and abut against the bottom of the plurality of movable blocks one by one.

[0009] In a possible implementation, a plurality of telescopic rods are circumferentially provided on the upper end of the ejection shaft, and the plurality of telescopic rods are connected to a plurality of movable blocks in a one-to-one correspondence, and the telescopic rods shorten or lengthen as the movable blocks rise and fall.

[0010] In a possible implementation, a positioning column is longitudinally provided on the lower end surface of the pressure plate, and the lower end of the positioning column abuts against the plurality of telescopic rods.

[0011] In a possible implementation, an ejection spring is provided at the bottom of the ejection shaft, and the ejection spring is used to drive the ejection shaft to eject the hub blank upward.

[0012] In one possible implementation, the guide assembly includes a plurality of guide slides and a plurality of top blocks, the plurality of guide slides are circumferentially opened on the spinning mold core, the guide slides are inclined inward from bottom to top, and the plurality of top blocks are arranged in the plurality of guide slides in a one-to-one correspondence, an elastic member is fixed to the bottom of the guide slide, the upper end of the elastic member is connected to the corresponding top block and provides elastic force for the top block to move upward along the guide slide.

[0013] The beneficial effect of the reverse rim spinning mold provided by the utility model is that: compared with the prior art, multiple guide components are inclined and raised along their axial direction, thereby driving multiple movable blocks to rise synchronously and gather inward. The wheel hub blank is buckled on the multiple movable blocks and the spinning mold core, and the upper mold drives the pressure plate to press the wheel hub blank downward. The wheel hub blank moves downward and is finally completely sleeved and fits on the spinning mold core. In the process of the wheel hub blank moving downward, the wheel hub blank squeezes the multiple movable blocks downward, and the multiple movable blocks move along the axial direction of the corresponding guide components, disperse downward and outward, and the conformal surfaces on the outside of the multiple movable blocks fit with the inner side surface of the wheel hub blank. When the spinning of the wheel hub blank is completed, the ejector shaft ejects the wheel hub blank upward, and the multiple movable blocks move along the axial direction of the corresponding guide components, gather upward and inward, thereby completing the demolding of the wheel hub blank. The utility model provides a reverse rim spinning die, which can realize smooth demoulding of the hub blank by means of the rising, gathering and descending dispersion of multiple movable blocks. There is no need to design a draft angle on the inner side of the hub blank, which reduces the processing amount of the inner side of the hub blank and improves the utilization rate of the blank material and the efficiency of machining. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 A schematic structural diagram of a reverse rim spinning die provided for the first embodiment of the present utility model;

[0016] Figure 2 A schematic structural diagram of a reverse rim spinning die provided for a second embodiment of the present utility model;

[0017] Figure 3 A schematic structural diagram of a reverse rim spinning die provided for a third embodiment of the present utility model;

[0018] Figure 4 The following are top views of the movable block provided by the utility model in two states.

[0019] In the picture:

[0020] 1. Upper die; 2. Lower die; 3. Pressure plate; 4. Spinning core; 5. Ejector shaft; 6. Movable block; 601. Conformal surface; 7. Ejector plate; 8. Telescopic rod; 9. Positioning column; 10. Ejector spring; 11. Guide slide; 12. Ejector block; 13. Elastic part; 14. Wheel hub blank; 15. Avoidance hole; 16. Lifting part. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] Unless otherwise explicitly defined, the use of terms such as "first," "second," or "third," etc., are intended to distinguish different objects rather than to describe a specific order.

[0023] Unless otherwise expressly defined, directional words such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", "high", "low" and the like indicating directions or positional relationships are based on the directions and positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, so they cannot be understood as limiting the specific scope of protection of the present invention.

[0024] See also Figures 1 to 4The present invention now provides a reverse rim spinning die. The reverse rim spinning die comprises an upper die 1 and a lower die 2. The upper die 1 is provided with a pressure plate 3, and the lower die 2 is provided with a spinning core 4. The pressure plate 3 is located above the spinning core 4. A liftable ejector shaft 5 is longitudinally provided in the middle of the spinning core 4. A plurality of movable blocks 6 are circumferentially provided on the upper end of the spinning core 4. The outer side surfaces of the plurality of movable blocks 6 together constitute a conformal surface 601 adapted to the inner side of the wheel hub. The spinning core 4 is provided with a plurality of guide assemblies circumferentially and obliquely. The plurality of movable blocks 6 are correspondingly provided at the upper ends of the plurality of guide assemblies. The guide assemblies are inclined inwardly from bottom to top and have axial displacement. The guide assemblies drive the movable blocks 6 to rise and gather inward or to descend and disperse outward.

[0025] The utility model provides a reverse rim spinning mold. Compared with the prior art, multiple guide components are inclined and raised along their axial direction, thereby driving multiple movable blocks 6 to rise synchronously and retract inward. The hub blank 14 is buckled on the multiple movable blocks 6 and the spinning core 4, and the upper mold 1 drives the pressure plate 3 to press the hub blank 14 downward. The hub blank 14 moves downward and is finally completely sleeved and fits on the spinning core 4. In the process of the hub blank 14 moving downward, the hub blank 14 squeezes the multiple movable blocks 6 downward, and the multiple movable blocks 6 move along the axial direction of the corresponding guide components, disperse downward and outward, and the conformal surfaces 601 on the outside of the multiple movable blocks 6 fit the inner side surface of the hub blank 14. When the hub blank 14 is spun, the ejector shaft 5 ejects the hub blank 14 upward, and the multiple movable blocks 6 move along the axial direction of the corresponding guide components, retract upward and inward, thereby completing the demolding of the hub blank 14. The utility model provides a reverse rim spinning mold, which can realize the smooth demoulding of the hub blank 14 by means of the rising, gathering and descending dispersion of multiple movable blocks 6. There is no need to design a draft angle on the inner side of the hub blank 14, which reduces the processing amount of the inner side of the hub blank 14 and improves the utilization rate of the blank material and the efficiency of machining.

[0026] See also Figure 4 The multiple movable blocks 6 form a circular ring structure in the folded state, and a avoidance hole 15 is formed in the middle of the circular ring structure for avoiding the upper end of the ejection shaft 5, so that the upper end of the ejection shaft 5 can move upward, thereby demolding the hub blank 14.

[0027] See also Figure 1 In the first embodiment, an ejector plate 7 is fixed horizontally at the upper end of the ejector shaft 5. The ejector shaft 5 is used to eject the hub blank 14 upward with the help of the ejector plate 7, which can increase the contact area of ​​the upper end of the ejector shaft 5 and improve the stability of the hub blank 14 demolding.

[0028] A plurality of lifting portions 16 are provided in the circumference of the ejector shaft 5. The lifting portions 16 extend radially and abut against the bottom of the plurality of movable blocks 6 one by one. When the ejector shaft 5 moves upward, the plurality of lifting portions 16 push the plurality of movable blocks 6 upward to disperse them outward and cooperate with the inner surface of the wheel hub blank 14. After the spinning is completed, the guide assembly and the ejector shaft 5 eject the plurality of movable blocks 6, completing the retraction of the plurality of movable blocks 6 and thus completing the demolding of the wheel hub blank 14.

[0029] See also Figure 2 In the second embodiment, a plurality of telescopic rods 8 are circumferentially provided on the upper end of the ejection shaft 5. The plurality of telescopic rods 8 are connected to the plurality of movable blocks 6 in a one-to-one correspondence. The telescopic rods 8 shorten or lengthen as the movable blocks 6 rise and fall. The telescopic rods 8 move upward with the ejection shaft 5. Under the action of the guide assembly, the telescopic rods 8 shorten as the corresponding movable blocks 6 rise along the axial direction of the guide assembly. After the movable blocks 6 rise, they reach a state of gathering inward; the telescopic rods 8 move downward with the ejection shaft 5. Under the action of the guide assembly, the telescopic rods 8 lengthen as the corresponding movable blocks 6 descend along the axial direction of the guide assembly. After the movable blocks 6 descend, they reach a state of dispersing outward. The telescopic rods 8 can be a sleeve structure, that is, a structure that is mutually inserted and axially movable. The portion of the telescopic rod 8 connected to the movable block 6 and the portion of the telescopic rod 8 connected to the ejection shaft 5 can move axially relative to each other.

[0030] Preferably, a positioning column 9 is longitudinally provided on the lower end surface of the pressure plate 3, and the lower end of the positioning column 9 abuts against the multiple telescopic rods 8. The positioning column 9 pushes the multiple telescopic rods 8 downward to achieve the purpose of driving the telescopic rods 8 to descend.

[0031] See also Figure 3 In the third embodiment, an ejector spring 10 is provided at the bottom of the ejector shaft 5. The ejector spring 10 is used to drive the ejector shaft 5 to eject the hub blank 14 upward. The ejector spring 10 is in the form of a spring combined with a fixed plate. When the ejector spring 10 is not under force, the ejector shaft 5 is in an upward ejecting state, the multiple telescopic rods 8 are in an extended state, and the multiple movable blocks 6 are in a gathered state and higher than the upper end surface of the spinning mold core 4. After the rim blank is installed, the multiple telescopic rods 8 can be shortened by the extrusion of the pressure plate 3, and the ejector shaft 5 moves downward and compresses the ejector spring 10, eventually causing the multiple movable blocks 6 to reach a dispersed state. When the hub blank 14 is spun, the pressure plate 3 rises, and the ejector spring 10 releases its elastic force to automatically eject the hub blank 14 upward, facilitating smooth demolding of the hub blank 14 after forming.

[0032] Specifically, the guide assembly includes multiple guide slides 11 and multiple top blocks 12. The multiple guide slides 11 are circumferentially arranged on the spinning mold core 4. The guide slides 11 are inclined inward from bottom to top. The multiple top blocks 12 are arranged one by one in the multiple guide slides 11. The bottom of the guide slides 11 is fixed with an elastic member 13. The upper end of the elastic member 13 is connected to the corresponding top block 12 and provides an elastic force for the top block 12 to move upward along the guide slides 11. The bottom of the guide slides 11 is fixed with an elastic member 13. The elastic member 13 can adopt a spring-coupled guide rod structure. The upper end of the elastic member 13 is connected to the corresponding top block 12 and provides an elastic force for the top block 12 to move upward along the guide slides 11. When the elastic member 13 is not under force, the multiple movable blocks 6 are in a gathered state and higher than the upper end surface of the spinning mold core 4. After the rim blank is installed, the pressure plate 3 is squeezed to cause the multiple movable blocks 6 and the top blocks 12 to slide downward along the corresponding guide slides 11 and spread radially, ultimately reaching a dispersed state.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A reverse rim spinning die, characterized in that: The invention comprises an upper die (1) and a lower die (2), wherein the upper die (1) is provided with a pressure plate (3), and the lower die (2) is provided with a spinning die core (4), wherein the pressure plate (3) is located above the spinning die core (4), and a liftable ejection shaft (5) is longitudinally provided in the middle of the spinning die core (4), and a plurality of movable blocks (6) are circumferentially provided on the upper end of the spinning die core (4), and the outer side surfaces of the plurality of movable blocks (6) together constitute a conformal surface (601) adapted to the inner side of the wheel hub, and the spinning die core (4) is provided with a plurality of guide assemblies circumferentially inclined, and the plurality of movable blocks (6) are arranged one by one at the upper ends of the plurality of guide assemblies, and the guide assemblies are inclined inwardly from bottom to top and have axial displacement, and the guide assemblies drive the movable blocks (6) to rise and gather inwardly or to fall and disperse outwardly.

2. A reverse rim spinning die according to claim 1, characterized in that: The plurality of movable blocks (6) form a circular ring structure in a folded state, and a middle portion of the circular ring structure forms a relief hole (15) for evading the upper end of the ejection shaft (5).

3. The reverse rim spinning die according to claim 1, wherein: An ejection plate (7) is fixedly provided horizontally on the upper end of the ejection shaft (5), and the ejection shaft (5) is used to eject the wheel hub blank (14) upwards with the help of the ejection plate (7).

4. A reverse rim spinning die according to claim 3, characterized in that: A plurality of lifting portions (16) are provided in the circumferential direction of the ejection shaft (5), and the lifting portions (16) extend radially and abut against the bottom of the plurality of movable blocks (6) one by one.

5. The reverse rim spinning die according to claim 1, wherein: A plurality of telescopic rods (8) are circumferentially arranged on the upper end of the ejection shaft (5), and the plurality of telescopic rods (8) are connected to a plurality of movable blocks (6) in a one-to-one correspondence. The telescopic rods (8) shorten or lengthen as the movable blocks (6) rise and fall.

6. The reverse rim spinning die according to claim 5, characterized in that: A positioning column (9) is longitudinally provided on the lower end surface of the pressure plate (3), and the lower end of the positioning column (9) abuts against the plurality of telescopic rods (8).

7. The reverse rim spinning die according to claim 5, characterized in that: An ejection spring (10) is provided at the bottom of the ejection shaft (5), and the ejection spring (10) is used to drive the ejection shaft (5) to eject the wheel hub blank (14) upward.

8. A reverse rim spinning die according to any one of claims 1 to 7, characterized in that: The guide assembly includes a plurality of guide slides (11) and a plurality of top blocks (12), wherein the plurality of guide slides (11) are circumferentially opened on the spinning core (4), the guide slides (11) are inclined inward from bottom to top, and the plurality of top blocks (12) are arranged in the plurality of guide slides (11) in a one-to-one correspondence, and an elastic member (13) is fixed to the bottom of the guide slide (11), and the upper end of the elastic member (13) is connected to the corresponding top block (12) and provides an elastic force for the top block (12) to move upward along the guide slide (11).

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