Pre-forming device for cold extrusion hub

Abstract

The utility model provides a cold extrusion hub pre-forming device, relates to the technical field of hub machining, and aims to solve the technical problems that a hydraulic device in the prior art can only output downward pressure through an upper die, the pressure is limited due to the fact that the projection area of a forming surface of the upper die is large, and the machining requirement that a hub can be formed only through higher pressure cannot be met. A cold extrusion hub pre-forming device comprises an upper die, a lower die, a cavity, a first driving assembly and a second driving assembly, a first forming face is arranged at the bottom end of the upper die, a through hole is formed in the middle of the cavity, the lower die is movably connected into the through hole in the vertical direction, a second forming face is arranged at the top end of the lower die, and a third forming face is arranged on the inner wall of the through hole. The first driving assembly is connected with the upper die and drives the upper die to vertically move so that the upper die and the lower die can be closed, when the upper die and the lower die are closed, the first forming face, the second forming face and the third forming face define a first forming die cavity used for forming the thick wall of the hub, and the second driving assembly is connected with the lower die and drives the lower die to vertically move.

Description

TECHNICAL FIELD

[0001] The utility model relates to wheel hub processing technical field, specifically is a kind of cold extrusion wheel hub initial forming device. BACKGROUND

[0002] Hydraulic device is mainly applied to compression molding, and the hydraulic device used in wheel hub processing is taken as an example, which mainly includes upper die and lower die, the lower die is fixed in the hydraulic device, and the upper die can be vertically moved to close or open the lower die, and the lower end surface of the upper die and the upper end surface of the lower die are both matched with the forming surface of the wheel hub shape. The raw material of the wheel hub initial forming is a cylindrical metal block, and the raw material is placed on the lower die. After the upper die is closed, the raw material is extruded and deformed to make the raw material into the shape of the wheel hub. However, in the forming process of the wheel hub, especially when the outer rim of the wheel hub is formed, the hydraulic device needs to output more pressure, but the traditional hydraulic device can only output downward pressure through the upper die, and the pressure is limited, which cannot meet the wheel hub processing requirements that need more pressure to form. SUMMARY

[0003] In view of the deficiencies of the prior art, the purpose of the utility model is to provide a cold extrusion wheel hub initial forming device to solve the technical problem that the hydraulic device in the prior art can only output downward pressure through the upper die, and the pressure is limited due to the large projection area of the upper die forming surface, which cannot meet the wheel hub processing requirements that need more pressure to form.

[0004] To solve the above technical problems, the utility model provides a cold extrusion wheel hub initial forming device, which comprises an upper die, a lower die, a cavity, a first driving assembly and a second driving assembly. The bottom end of the upper die is provided with a first forming surface, the middle part of the cavity is provided with a through hole, the lower die is connected in the through hole along the vertical direction, the top end of the lower die is provided with a second forming surface, the inner wall of the through hole is provided with a third forming surface, the first driving assembly is connected with the upper die and drives the upper die to move vertically so that the upper die is combined with the lower die. When the upper die is combined with the lower die, the first forming surface, the second forming surface and the third forming surface form a first forming cavity for forming the thick wall of the wheel hub, and the second driving assembly is connected with the lower die and drives the lower die to move vertically.

[0005] With the above structure, the cold extrusion hub initial forming device has the following advantages: in the hub initial forming process, the raw material is placed on the lower die, in the first step of forming, the first driving assembly drives the upper die to descend and combine with the lower die to deform the raw material into the shape of the hub intermediate body; in the second step of forming, the second driving assembly drives the lower die to ascend, and the upper die and the lower die apply pressure to the raw material in sequence, which can generate greater pressure and promote the raw material to deform the rim part; in the first step of forming, the deformation amount of the raw material is relatively small, and the upper die pressure can meet the pressure demand; in the second step of forming, the deformation amount of the raw material is relatively large, and at this time, the upper die and the lower die apply pressure in sequence to increase the pressure applied to the raw material, so as to promote the hub forming, thereby meeting the hub processing demand which requires greater pressure to form.

[0006] As an improvement, the utility model also includes third driving assembly, top rod is connected with along vertical activity in lower die, third driving assembly connects top rod and drives top rod vertical movement makes top rod upper end extend into first forming cavity, adopt this kind of structure, after hub processing forming, by third driving assembly drive top rod and eject the hub.

[0007] As an improvement, top rod upper end is located in first forming cavity, and the upper end of the top rod is provided with a fourth forming surface; with this structure, the hub is formed by the top rod, and the hub is directly ejected after forming, which is simple in structure.

[0008] As an improvement, the second forming surface comprises, in sequence from the inside to the outside, a flat section, an arc section and a conical section, the flat section is connected with the conical section through the arc section, and the top rod passes through the second forming surface through the center of the flat section.

[0009] As an improvement, the third forming surface is located in the middle of the inner wall of the through hole and divides the through hole into an upper hole and a lower hole, the inner diameter of the upper hole is greater than that of the lower hole, and when the upper die and the lower die are combined, the upper die is located in the upper hole and the lower die is located in the lower hole.

[0010] As an improvement, the outer peripheral wall of the lower die is provided with an annular groove in the circumferential direction to form a second forming cavity, and the upper end of the second forming cavity is communicated with the first forming cavity; with this structure, the annular groove acts as the second forming cavity to form the rim part.

[0011] As an improvement, the utility model also includes a lower beam plate connected below the cavity, and the second driving assembly is connected to the lower beam plate.

[0012] As an improvement, the first forming surface comprises a plurality of protruding portions protruding downward. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structure schematic view before the utility model combines.

[0014] Figure 2It is the structure schematic view of first step forming of the utility model.

[0015] Figure 3 It is the structure schematic view of second step forming of the utility model.

[0016] Figure 4 It is the structure schematic view of opening mould of the utility model.

[0017] Figure 5 It is the front view schematic view of spoke of the utility model.

[0018] The drawing reference: 1, upper mould;2, lower mould;3, cavity;4, first forming surface;41, protruding part;5, through hole;51, upper hole;52, lower hole;6, second forming surface;61, plane section;62, arc section;63, taper section;7, third forming surface;8, ejector rod;9, fourth forming surface;10, second forming cavity;11, first forming cavity;12, spoke. Specific implementation

[0019] The utility model discloses a cold extrusion hub preliminary forming device, which relates to the technical field of cold extrusion hub forming devices.

[0020] As Figures 1 to 4 shown, a kind of cold extrusion hub preliminary forming device, including upper mould 1, lower mould 2, cavity 3, first drive assembly and second drive assembly, and the bottom end of upper mould 1 is equipped with first forming surface 4, and first forming surface 4 includes several downward protruding protruding part 41, to match the shape of hub, forming the structure as Figure 5 shown spoke 12;Cavity 3 middle part is equipped with through hole 5, and lower mould 2 is connected in through hole 5 along vertical direction movement, and the top of lower mould 2 is equipped with second forming surface 6, and second forming surface 6 includes plane section 61, arc section 62 and taper section 63 from inside to outside in sequence, and plane section 61 is connected with taper section 63 by arc section 62, wherein, arc section 62 is inclined upward protruding arc, and plane section 61 is the lowest end in second forming surface 6, and taper section 63 is the highest end, and second forming surface 6 is also matched with the shape of hub, and specific no longer repeat.

[0021] As Figure 1As shown, the inner wall of the through hole 5 is provided with a third forming surface 7. Specifically, the third forming surface 7 is located in the middle of the inner wall of the through hole 5 and divides the through hole 5 into an upper hole 51 and a lower hole 52. The inner diameter of the upper hole 51 is larger than the inner diameter of the lower hole 52. The first driving component is connected to the upper mold 1 and drives the upper mold 1 to move vertically so that the upper mold 1 and the lower mold 2 are closed. When the upper mold 1 and the lower mold 2 are closed, the first forming surface 4, the second forming surface 6 and the third forming surface 7 surround and form a first forming cavity 11 for forming the thick wall of the wheel hub. The second driving component is connected to the lower mold 2 and drives the lower mold 2 to move vertically. When the upper mold 1 and the lower mold 2 are closed, the upper mold 1 is located in the upper hole 51 and the lower mold 2 is located in the lower hole 52. The third forming surface 7 is used to form the lower edge of the wheel hub. In addition, the outer peripheral wall of the lower mold 2 is provided with an annular groove along the circumferential direction to form a second forming mold cavity 10. The upper end of the second forming mold cavity 10 is connected to the first forming mold cavity 11. The second forming mold cavity 10 is used to form the outer rim of the wheel hub.

[0022] like Figure 1 As shown, a push rod 8 is vertically connected to the inner edge of the lower mold 2. The third drive assembly is connected to the push rod 8 and drives the push rod 8 to move vertically so that the upper end of the push rod 8 extends into the first molding cavity 11. The upper end of the push rod 8 is located in the first molding cavity 11. The upper end surface of the push rod 8 is provided with a fourth molding surface 9, that is, the fourth molding surface 9 and the second molding surface 6 together form the lower part of the hub. Specifically, the push rod 8 passes through the center of the planar segment 61 and exits the second molding surface 6.

[0023] This utility model also includes a lower beam plate, which is connected below the cavity 3. The second drive assembly and the third drive assembly are both connected to the lower beam plate. The first drive assembly, the second drive assembly and the third drive assembly are all hydraulic cylinders.

[0024] During the initial forming process of the wheel hub, the raw material is placed on the lower mold 2, and the various structural positions before mold closing are as follows: Figure 1 As shown; during the first molding step, the first drive assembly drives the upper mold 1 to descend and close with the lower mold 2 to transform the raw material into the shape of the central body of the wheel hub, as shown. Figure 2 As shown, the spoke 12 structure is first pressed out, while the thick-walled portion is filled first. In the second molding step, the second drive assembly drives the lower mold 2 to rise, and the upper mold 1 and lower mold 2 apply pressure to the raw material successively. Because the contact area (projected area) between the upper mold 1 and the product is large, and the contact area (projected area) between the lower mold 2 and the product is small, greater pressure can be generated, causing the raw material to deform into the rim portion, as shown. Figure 3 As shown; finally, the upper mold 1 moves upward, and the ejector pin 8 pushes out the formed wheel hub, as shown. Figure 4The first step in the forming process, the deformation of the raw material is relatively small, the upper die 1 pressure can meet the pressure demand, the second step in the forming, the deformation of the raw material is relatively large, at this time by the upper die 1 and the lower die 2 successively exert pressure to improve the pressure exerted on the raw material, promote the forming of the hub, thereby meet the need of the hub processing demand which can be formed by larger pressure; In the utility model, because the projection area of the lower die 2 top end is small, and the same pressure is applied to the upper die 1 with relatively large projection area, larger pressure is generated in the cavity 3 to extrude into the second forming cavity 10 for forming the thin wall of the hub.

[0025] The embodiment of the utility model is described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned one embodiment, all other embodiments obtained by the person skilled in the art without making creative labor belong to the range of protection of the utility model.

Claims

1. A cold extrusion hub preforming apparatus, characterized by, The utility model relates to a wheel hub thick wall forming die, including upper die (1), lower die (2), cavity (3), first drive assembly and second drive assembly, the bottom of upper die (1) is equipped with first forming surface (4), the middle part of cavity (3) is equipped with through -hole (5), lower die (2) is connected in through -hole (5) along vertical movement, the top of lower die (2) is equipped with second forming surface (6), the inner wall of through -hole (5) is equipped with third forming surface (7), first drive assembly connects upper die (1) and drives upper die (1) vertical movement makes upper die (1) with lower die (2) clamping, when upper die (1) with lower die (2) clamping, first forming surface (4), second forming surface (6) and third forming surface (7) enclose and form first forming cavity (11) for forming wheel hub thick wall, second drive assembly connects lower die (2) and drives lower die (2) vertical movement.

2. A cold extrusion hub preforming apparatus according to claim 1, characterised in that, Still including third drive assembly, the top rod (8) is movably connected in lower die (2) along vertical direction, third drive assembly connects top rod (8) and drives top rod (8) vertical movement makes top rod (8) upper end stretch into first forming cavity (11).

3. A cold extrusion hub preforming apparatus according to claim 2, wherein, The top rod (8) upper end is located in first forming cavity (11), and the top rod (8) upper end face is equipped with fourth forming surface (9).

4. A cold extrusion hub preforming apparatus according to claim 3, wherein, Second forming surface (6) includes plane section (61), arc section (62) and taper section (63) gradually from inside to outside, plane section (61) is connected with taper section (63) through arc section (62), and top rod (8) passes through plane section (61) center and goes out second forming surface (6).

5. The cold extruded hub preform apparatus of claim 1 wherein, Third forming surface (7) is located in the middle part of the inner wall of through -hole (5) and divides through -hole (5) into upper hole (51) and lower hole (52), the inner diameter of upper hole (51) is greater than the inner diameter of lower hole (52), when upper die (1) with lower die (2) clamping, upper die (1) is located in upper hole (51), and lower die (2) is located in lower hole (52).

6. A cold extrusion hub preforming apparatus according to claim 5, wherein, The outer peripheral wall of lower die (2) is provided with annular groove along the circumference and forms second forming cavity (10), and the upper end of second forming cavity (10) is communicated with first forming cavity (11).

7. The cold extruded hub preform apparatus of claim 1 wherein, Still including lower beam plate, the lower beam plate is connected below cavity (3), and second drive assembly connects lower beam plate.

8. The cold extruded hub preform apparatus of claim 1 wherein, First forming surface (4) includes several downward protruding protruding parts (41).

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