A wheel hub lip thickening and forming device

Abstract

The invention provides a hub lip thickening and forming device, which relates to the technical field of hub processing, and solves the technical problems in the prior art that the hub lip is easy to fold and break during the bending process, and has low strength and high cost after bending; a hub lip thickening and forming device comprises a lower die, a side die, an upper die, a sleeve and a driving component, a forming cavity is arranged in the side die, the inner wall of the side die is in contact with the outer wall of the hub, the outer wall of the upper die is in contact with the inner wall of the hub, an extrusion portion is arranged circumferentially on the outer wall of the upper die, the sleeve is movably sleeved on the extrusion portion along the vertical direction, the driving component drives the sleeve to move vertically, a plurality of through grooves which radially penetrate the inner and outer walls of the sleeve are equidistantly arranged on the lower end face of the sleeve along the circumferential direction, a deformation portion is formed between every two through grooves, an annular groove is arranged on the upper end face of the side die, the driving component drives the deformation portion to enter the annular groove, and a deformation space for deformation of the deformation portion is reserved between the deformation portion and the inner wall of the annular groove, and the inner wall of the deformation portion is used to be in contact with the upper part of the outer wall of the hub.

Description

Technical Field

[0001] The invention relates to the technical field of wheel hub processing, in particular to a wheel hub lip thickening and forming device. Background Art

[0002] Cold extrusion of wheel hubs is one of the production methods of wheel hubs. The equipment for cold extrusion mainly includes a fixed lower die and a movable upper die. The upper die and the lower die are provided with forming surfaces. The raw materials are placed in the lower die, and the upper die is pressed down to process the raw materials into a preformed wheel hub under pressure. Afterwards, the upper end of the preformed wheel hub needs to be bent to form a lip. The forming device includes a lower die, a side die and an upper die. The preformed wheel hub is placed in the lower die and the side die, and the upper die is pressed down to fold the upper end of the preformed wheel hub outward to form a lip. However, in order to thicken the lip, either the barrel is thickened as a whole and then cut to make it thinner, which is more expensive; or it is directly upset and thickened on the basis of a thin wall, but this is prone to folding, breaking and other problems, and the strength of the lip after bending is also affected. Summary of the invention

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a hub lip thickening and forming device to solve the technical problems in the prior art that the initially formed hub lip is easy to fold and break during the upsetting and bending process, has low strength after bending, and has high cost.

[0004] In order to solve the above technical problems, the present invention provides a wheel hub lip thickening forming device, comprising a lower die, a side die, an upper die, a sleeve and a driving assembly, wherein the side die is arranged above the lower die, a forming cavity located above the lower die is arranged in the side die, the driving assembly drives the upper die to move vertically and enables the upper die to enter the forming cavity from top to bottom, the inner wall of the side die is in contact with the outer wall of the wheel hub, the outer wall of the upper die is in contact with the inner wall of the wheel hub, an extrusion portion for abutting against the top end of the wheel hub is arranged circumferentially on the outer wall of the upper die, the sleeve is movably sleeved on the extrusion portion along the vertical direction, and the driving assembly drives the sleeve to move vertically. The lower end surface of the collar is provided with a plurality of through grooves which penetrate the inner wall and the outer wall of the collar in a radial direction at equal intervals along the circumferential direction, and a deformation portion which can be elastically deformed is formed between every two through grooves. The upper end surface of the side mold is provided with an annular groove which is connected with the forming cavity and for the deformation portion to enter. The driving component drives the deformation portion to enter the annular groove, and a deformation space for the deformation portion to deform is reserved between the deformation portion and the inner wall of the annular groove. The inner wall of the deformation portion is used to fit against the upper part of the outer wall of the hub. When the inner wall of the deformation portion fits against the upper part of the outer wall of the hub, the upper end of the hub is deformed outward and the deformation portion is deformed outward when the extrusion portion descends.

[0005] After adopting the above structure, a hub lip thickening forming device of the present invention has the following advantages: the initially formed hub is placed in the forming cavity, the upper die descends and makes the extrusion part abut against the top of the hub, and the inner wall of the deformation part of the sleeve is in contact with the upper part of the outer wall of the hub. At this time, the extrusion part is pressed down, and the upper end of the hub is deformed under the pressure of the extrusion part. Since the inner wall of the hub is in contact with the outer wall of the upper die, only the part of the hub in contact with the deformation part can be deformed, and the deformation direction is outward. Since the deformation amount of the deformation part is limited, the deformation of the upper end of the hub needs to deform the deformation part first. Therefore, the pressure of the extrusion part will not cause the upper end of the hub to fold outward, but increase the thickness of the upper end of the hub. Then the sleeve rises to leave an annular groove. At this time, the upper die is pressed down again, and the thickened upper end of the hub is folded outward under the action of the extrusion part and the deformation part to form a lip. The lip processed in this way has a larger thickness, is not easy to break during the bending process, and has a higher strength after the bending. Moreover, it does not need to be thickened first and then cut, and the cost is low.

[0006] As an improvement, the inner wall of the side mold is provided with a first molding surface for molding the wheel hub, the annular groove is located above the first molding surface, the outer wall of the upper mold is provided with a second molding surface that cooperates with the first molding surface and is used to mold the wheel hub, the extrusion portion is located above the second molding surface, and the first molding surface and the second molding surface are respectively used to adhere to the outer wall and inner wall of the wheel hub; by adopting this structure, the unmolded part of the initially molded wheel hub can be further molded by the first molding surface and the second molding surface.

[0007] As an improvement, the driving assembly drives the deformation part into the annular groove and makes the upper part of the deformation part stick to the inner wall of the annular groove, leaving a deformation space between the lower part of the deformation part and the inner wall of the annular groove; with this structure, the upper part of the deformation part sticks to the inner wall of the annular groove, making the upper part of the deformation part less likely to deform, which is more conducive to thickening the upper end of the hub.

[0008] As an improvement, a first concave arc-shaped groove is provided on the outer wall of the lower part of the deformation part; such a structure is conducive to the deformation of the deformation part, and the setting of the first arc-shaped groove makes the thickness of the connecting part between the lower part of the deformation part and the upper part of the deformation part gradually decrease from top to bottom, thereby preventing the lower part of the deformation part from breaking when deforming outward, and also increasing the thickness of the bottom end part of the deformation part, which not only limits the maximum deformation amount of the deformation part, but also is conducive to the formation of the hub lip.

[0009] As an improvement, a second arc-shaped groove matching the top of the hub is provided at the bottom end of the extrusion portion, and the opening of the second arc-shaped groove is arranged toward the deformation space; with this structure, when the extrusion portion applies pressure to the upper end of the hub, the second arc-shaped groove opening toward the deformation space can exert an outward component force on the upper end of the hub, thereby promoting the upper end of the hub to thicken and deform outward, and at the same time, during the bending process, it can also promote the upper end of the hub to bend and deform outward.

[0010] As an improvement, the bottom end of the deformation portion is an inclined surface that slopes from the inside to the outside and upwards; with this structure, the bottom end of the deformation portion also serves as a molding surface, so that the lip edge is formed into an ideal shape.

[0011] As an improvement, the side mold includes a left mold and a right mold, and both the left mold and the right mold can be moved in the left and right directions and spliced ​​to form the side mold; adopting this structure is conducive to demoulding and closing the mold.

[0012] As an improvement, a push rod for ejecting the wheel hub is vertically movable in the lower mold; with this structure, after the wheel hub is processed, the push rod directly ejects the wheel hub from the molding cavity, making the processing more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the present invention before the hub is thickened.

[0014] Figure 2 It is a schematic diagram of the structure of the present invention after the wheel hub is thickened.

[0015] Figure 3 It is a schematic diagram of the structure of the present invention before the wheel hub is bent.

[0016] Figure 4 It is a schematic diagram of the structure of the present invention after the wheel hub is bent.

[0017] Figure 5 It is a schematic diagram of the three-dimensional structure of the sleeve ring in the present invention.

[0018] Figure numerals: 1, lower mold; 2, side mold; 21, left mold; 22, right mold; 3, upper mold; 4, collar; 5, molding cavity; 6, extrusion portion; 7, through groove; 8, deformation portion; 9, deformation space; 10, first molding surface; 11, second molding surface; 12, annular groove; 13, first arc groove; 14, second arc groove; 15, ejector pin. DETAILED DESCRIPTION

[0019] A hub lip thickening and forming device of the present invention is described in detail below with reference to the accompanying drawings.

[0020] like Figures 1 to 5 As shown, a wheel hub lip thickening forming device includes a lower mold 1, a side mold 2, an upper mold 3, a collar 4 and a driving assembly, wherein the side mold 2 is arranged above the lower mold 1, and a molding cavity 5 located above the lower mold 1 is provided in the side mold 2, wherein the side mold 2 includes a left mold 21 and a right mold 22, and both the left mold 21 and the right mold 22 can be moved in the left and right directions and spliced ​​to form the side mold 2, and a push rod 15 for ejecting the wheel hub is vertically movable in the lower mold 1, and the push rod 15 enters the molding cavity 5 from bottom to top to eject the wheel hub, and the driving structure and driving method of the left mold 21, the right mold 22 and the push rod 15 are all existing technologies and will not be repeated here.

[0021] The driving assembly drives the upper mold 3 to move vertically and allows the upper mold 3 to enter the molding cavity 5 from top to bottom. The specific structure of the driving assembly is prior art and will not be described here. The inner wall of the side mold 2 is in contact with the outer wall of the wheel hub. Specifically, the inner wall of the side mold 2 is only in contact with the lower part of the outer wall of the wheel hub, while the upper part of the outer wall of the wheel hub is not in contact with the inner wall of the side mold 2. The outer wall of the upper mold 3 is in contact with the inner wall of the wheel hub. The inner and outer walls of the initially formed wheel hub are both arranged vertically. In order to further process the wheel hub into a specified shape, the inner wall of the side mold 2 is provided with a first molding surface 10 for molding the wheel hub, and the outer wall of the upper mold 3 is provided with a second molding surface 11 that cooperates with the first molding surface 10 and is used to mold the wheel hub. The first molding surface 10 and the second molding surface 11 are respectively used to be in contact with the outer wall and the inner wall of the wheel hub.

[0022] like Figure 1 As shown, an extrusion portion 6 for abutting against the top of the hub is provided on the outer wall of the upper mold 3 in the circumferential direction, and the extrusion portion 6 is located above the second molding surface 11. The collar 4 is movably sleeved on the extrusion portion 6 in the vertical direction, and the driving assembly drives the collar 4 to move vertically, as shown in FIG. Figure 5 As shown, a plurality of through grooves 7 radially penetrating the inner and outer walls of the collar 4 are equidistantly arranged on the lower end face of the collar 4 along the circumferential direction, and an elastically deformable deformation portion 8 is formed between every two through grooves 7. An annular groove 12 which is connected with the forming cavity 5 and for the deformation portion 8 to enter is arranged on the upper end face of the side mold 2. The annular groove 12 is located above the first forming surface 10. The driving assembly drives the deformation portion 8 to enter the annular groove 12, and a deformation space 9 for the deformation portion 8 to deform is reserved between the deformation portion 8 and the inner wall of the annular groove 12. The inner wall of the deformation portion 8 is used to fit against the upper part of the outer wall of the hub. When the inner wall of the deformation portion 8 fits against the upper part of the outer wall of the hub, the extrusion portion 6 descends to cause the upper end of the hub to deform outward and the deformation portion 8 to deform outward.

[0023] Specifically, the driving assembly drives the deformation portion 8 to enter the annular groove 12 and makes the upper portion of the deformation portion 8 abut against the inner wall of the annular groove 12, leaving a deformation space 9 between the lower portion of the deformation portion 8 and the inner wall of the annular groove 12, and Figure 1 and Figure 5 As shown, the outer wall of the lower part of the deformation part 8 is provided with a first arc-shaped groove 13 which is concave. The arrangement of the first arc-shaped groove 13 and the position of the deformation part 8 in the annular groove 12 are actually to thicken the upper end of the hub, that is, to ensure that the upper end of the hub can be deformed outward under pressure so that the thickness of this part is increased. Figure 1 As shown, the bottom end of the extrusion portion 6 is provided with a second arc groove 14 matching the top end of the hub, and the opening of the second arc groove 14 is arranged toward the deformation space 9, and the bottom end of the deformation portion 8 is an inclined surface inclined from inside to outside and upward.

[0024] The initially formed wheel hub is placed in the forming cavity 5. The section line portion in the figure is the wheel hub. The upper die 3 is lowered so that the extrusion portion 6 abuts against the top of the wheel hub, and the inner wall of the deformation portion 8 of the collar 4 abuts against the upper part of the outer wall of the wheel hub, so as to achieve the following result: Figure 1At this time, the extrusion portion 6 is pressed downward, and the upper end of the wheel hub is deformed under the pressure of the extrusion portion 6. Since the inner wall of the wheel hub is in contact with the outer wall of the upper mold 3, only the part of the wheel hub in contact with the deformation portion 8 can be deformed, and the deformation direction is outward. Since the deformation amount of the deformation portion 8 is limited, the deformation of the upper end of the wheel hub needs to deform the deformation portion 8 first. Therefore, the pressure of the extrusion portion 6 will not cause the upper end of the wheel hub to fold outward, but increase the thickness of the upper end of the wheel hub, such as Figure 2 As shown, the deformation portion 8 elastically deforms outward to leave space so that the upper end of the hub becomes thicker under pressure; Figure 3 As shown, the sleeve ring 4 then rises to leave an annular groove 12; at this time, the upper die 3 is pressed down again, and the thickened upper end of the hub is folded outwards to form a lip under the action of the extrusion part 6 and the deformation part 8, so as to achieve the following Figure 4 The lip edge processed in this way is thicker, less likely to break during the bending process, and has higher strength after bending. It does not need to be thickened before cutting, so the cost is lower.

[0025] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned one embodiment, and all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present invention.

Claims

1. A wheel hub lip thickening and forming device, characterized in that: The invention comprises a lower die (1), a side die (2), an upper die (3), a sleeve (4) and a driving assembly, wherein the side die (2) is arranged above the lower die (1), a molding cavity (5) located above the lower die (1) is arranged in the side die (2), the driving assembly drives the upper die (3) to move vertically and enables the upper die (3) to enter the molding cavity (5) from top to bottom, the inner wall of the side die (2) is in contact with the outer wall of the wheel hub, the outer wall of the upper die (3) is in contact with the inner wall of the wheel hub, an extrusion portion (6) for abutting against the top end of the wheel hub is arranged on the outer wall of the upper die (3) along the circumferential direction, the sleeve (4) is movably sleeved on the extrusion portion (6) along the vertical direction, the driving assembly drives the sleeve (4) to move vertically, and the lower end surface of the sleeve (4) is circumferentially moved. A plurality of through grooves (7) are provided radially penetrating the inner wall and the outer wall of the collar (4), and an elastically deformable deformation portion (8) is formed between every two of the through grooves (7). An annular groove (12) is provided on the upper end surface of the side mold (2) and is communicated with the molding cavity (5) and for the deformation portion (8) to enter. The driving assembly drives the deformation portion (8) to enter the annular groove (12), and a deformation space (9) is left between the deformation portion (8) and the inner wall of the annular groove (12) for the deformation portion (8) to deform. The inner wall of the deformation portion (8) is used to abut against the upper part of the outer wall of the wheel hub. When the inner wall of the deformation portion (8) abuts against the upper part of the outer wall of the wheel hub, the extrusion portion (6) descends so that the upper end of the wheel hub is deformed outward and the deformation portion (8) is deformed outward.

2. The wheel hub lip thickening and forming device according to claim 1, characterized in that: The inner wall of the side mold (2) is provided with a first molding surface (10) for molding the wheel hub, the annular groove (12) is located above the first molding surface (10), the outer wall of the upper mold (3) is provided with a second molding surface (11) that cooperates with the first molding surface (10) and is used for molding the wheel hub, the extrusion portion (6) is located above the second molding surface (11), and the first molding surface (10) and the second molding surface (11) are used to abut against the outer wall and inner wall of the wheel hub respectively.

3. The wheel hub lip thickening and forming device according to claim 1, characterized in that: The driving assembly drives the deformation portion (8) to enter the annular groove (12) and causes the upper portion of the deformation portion (8) to abut against the inner wall of the annular groove (12), leaving the deformation space (9) between the lower portion of the deformation portion (8) and the inner wall of the annular groove (12).

4. The wheel hub lip thickening and forming device according to claim 3, characterized in that: The lower outer wall of the deformation portion (8) is provided with a first inwardly concave arc-shaped groove (13).

5. The wheel hub lip thickening and forming device according to claim 1, characterized in that: The bottom end of the extrusion portion (6) is provided with a second arc-shaped groove (14) matching the top end of the hub, and the opening of the second arc-shaped groove (14) is arranged toward the deformation space (9).

6. The wheel hub lip thickening and forming device according to claim 1, characterized in that: The bottom end of the deformation portion (8) is an inclined surface that slopes from the inside outward and upward.

7. The wheel hub lip thickening and forming device according to claim 1, characterized in that: The side mold (2) comprises a left mold (21) and a right mold (22), and the left mold (21) and the right mold (22) are both capable of moving in a left-right direction and being spliced ​​to form the side mold (2).

8. The wheel hub lip thickening and forming device according to claim 1, characterized in that: A push rod (15) for ejecting the wheel hub is vertically movably provided inside the lower mold (1).

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