Pre-forming device for cold extrusion hub

Abstract

The invention provides a cold extrusion hub pre-forming device, relates to the technical field of hub machining, and aims to solve the technical problems that in the prior art, a hydraulic device can only output downward pressure through an upper die, the pressure is limited due to the fact that the projection area of the forming face 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 invention relates to the technical field of wheel hub processing, in particular to a cold extrusion wheel hub primary forming device. Background Art

[0002] Hydraulic devices are mainly used for press forming. Taking the hydraulic device used for wheel hub processing as an example, it mainly includes an upper die and a lower die. The lower die is fixed in the hydraulic device, and the upper die can move vertically to close or open the lower die. The lower end face of the upper die and the upper end face of the lower die are both forming surfaces that match the shape of the wheel hub. The raw material for the initial forming of the wheel hub is a cylindrical metal block. The raw material is placed on the lower die. After the upper die is closed, the raw material is squeezed and deformed to form the shape of the wheel hub. However, during the forming process of the wheel hub, especially when forming the outer ring rim of the wheel hub, the hydraulic device needs to be able to output a higher pressure, but the traditional hydraulic device can only output the lower pressure through the upper die. The pressure is limited and cannot meet the processing requirements of the wheel hub that requires a higher pressure to form. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a cold extrusion wheel hub primary 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 projected area of ​​the upper die forming surface, and cannot meet the processing requirements of the wheel hub that requires greater pressure to form.

[0004] In order to solve the above technical problems, the present invention provides a cold extrusion wheel hub primary forming device, including an upper mold, a lower mold, a cavity, a first driving assembly and a second driving assembly. The bottom end of the upper mold is provided with a first molding surface, the middle part of the cavity is provided with a through hole, the lower mold is vertically movable and connected in the through hole, the top end of the lower mold is provided with a second molding surface, and the inner wall of the through hole is provided with a third molding surface. The first driving assembly is connected to the upper mold and drives the upper mold to move vertically so that the upper mold and the lower mold are closed. When the upper mold and the lower mold are closed, the first molding surface, the second molding surface and the third molding surface are combined to form a first molding cavity for forming a thick wall of the wheel hub. The second driving assembly is connected to the lower mold and drives the lower mold to move vertically.

[0005] After adopting the above structure, a cold extrusion wheel hub initial forming device of the present invention has the following advantages: in the initial forming process of the wheel hub, the raw material is placed on the lower die, and in the first forming step, the first driving component drives the upper die to descend and close the die with the lower die to deform the raw material into the shape of the middle body of the wheel hub; in the second forming step, the second driving component drives the lower die to rise, and the upper die and the lower die successively apply pressure to the raw material, which can generate greater pressure and cause the raw material to deform into the rim part; in the first forming process, the deformation of the raw material is relatively small, and the pressure of the upper die can meet the pressure requirement. In the second forming step, the deformation of the raw material is relatively large. At this time, the upper die and the lower die successively apply pressure to increase the pressure applied to the raw material, which causes the wheel hub to be formed, thereby meeting the processing requirements of the wheel hub that requires greater pressure to form.

[0006] As an improvement, the present invention also includes a third driving component, and a push rod is vertically movably connected in the lower mold. The third driving component is connected to the push rod and drives the push rod to move vertically so that the upper end of the push rod extends into the first molding cavity. With this structure, after the wheel hub is processed and formed, the third driving component drives the push rod to eject the wheel hub.

[0007] As an improvement, the upper end of the ejector pin is located in the first molding cavity, and a fourth molding surface is provided on the upper end surface of the ejector pin. With this structure, the wheel hub is molded together with the ejector pin, and the wheel hub is directly ejected after molding, which has a simple structure.

[0008] As an improvement, the second molding surface includes a plane segment, an arc segment and a conical segment from the inside to the outside, the plane segment is connected to the conical segment through the arc segment, and the ejector rod passes through the second molding surface through the center of the plane segment.

[0009] As an improvement, the third molding 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 larger than the inner diameter of the lower hole. When the upper mold and the lower mold are closed, the upper mold is located in the upper hole and the lower mold is located in the lower hole.

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

[0011] As an improvement, the present invention further comprises a lower beam plate, the lower beam plate is connected below the cavity, and the second driving assembly is connected to the lower beam plate.

[0012] As an improvement, the first molding surface includes a plurality of protrusions protruding downward. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0014] Figure 2It is a schematic diagram of the structure during the first step of molding of the present invention.

[0015] Figure 3 It is a schematic diagram of the structure during the second step of molding of the present invention.

[0016] Figure 4 It is a schematic diagram of the structure after the mold is opened in the present invention.

[0017] Figure 5 It is a front schematic diagram of the spoke in the present invention.

[0018] Figure numerals: 1. upper mold; 2. lower mold; 3. cavity; 4. first molding surface; 41. protrusion; 5. through hole; 51. upper hole; 52. lower hole; 6. second molding surface; 61. plane segment; 62. arc segment; 63. conical segment; 7. third molding surface; 8. ejector pin; 9. fourth molding surface; 10. second molding cavity; 11. first molding cavity; 12. spoke. DETAILED DESCRIPTION

[0019] A cold extrusion hub primary forming device of the present invention is described in detail below with reference to the accompanying drawings.

[0020] like Figures 1 to 4 As shown, a cold extrusion wheel hub initial forming device includes an upper die 1, a lower die 2, a cavity 3, a first drive assembly and a second drive assembly. The upper die 1 is provided with a first forming surface 4 at the bottom end. The first forming surface 4 includes a plurality of protrusions 41 protruding downward to match the shape of the wheel hub. Figure 5 The spoke 12 structure shown in the figure; a through hole 5 is provided in the middle of the cavity 3, the lower mold 2 is vertically movable and connected in the through hole 5, a second molding surface 6 is provided at the top of the lower mold 2, and the second molding surface 6 includes a plane segment 61, an arc segment 62 and a conical segment 63 from the inside to the outside, the plane segment 61 is connected to the conical segment 63 through the arc segment 62, wherein the arc segment 62 is an arc that bulges obliquely upward, the plane segment 61 is the lowest end of the second molding surface 6, and the conical segment 63 is the highest end, and the second molding surface 6 also matches the shape of the hub, and the details are not repeated here.

[0021] like Figure 1As shown, the inner wall of the through hole 5 is provided with a third molding surface 7. Specifically, the third molding 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 molded together. When the upper mold 1 and the lower mold 2 are molded together, the first molding surface 4, the second molding surface 6 and the third molding surface 7 are surrounded to form a first molding cavity 11 for molding a 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 molded together, the upper mold 1 is located in the upper hole 51, the lower mold 2 is located in the lower hole 52, and the third molding surface 7 is used to mold the lower edge of the wheel hub. In addition, an annular groove is provided on the outer peripheral wall of the lower mold 2 along the circumferential direction to form a second molding cavity 10. The upper end of the second molding cavity 10 is connected to the first molding cavity 11. The second molding cavity 10 is used to mold the outer ring rim of the wheel hub.

[0022] like Figure 1 As shown, a push rod 8 is vertically movably connected inside the lower mold 2, and a third driving 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, and a fourth molding surface 9 is provided on the upper end surface of the push rod 8, that is, the fourth molding surface 9 and the second molding surface 6 jointly form the lower part of the hub. Specifically, the push rod 8 passes through the second molding surface 6 through the center of the plane section 61.

[0023] The present invention 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, and 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 the mold is closed are as follows Figure 1 As shown; in the first step of molding, the first drive assembly drives the upper mold 1 to descend and close the mold with the lower mold 2 to deform the raw material into the shape of the intermediate body of the hub, such as Figure 2 As shown, the spoke 12 structure is pressed out first, and the thick wall part is filled first; in the second step of forming, the second driving assembly drives the lower mold 2 to rise, and the upper mold 1 and the lower mold 2 successively apply pressure to the raw material. Since 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, a greater pressure can be generated, causing the raw material to deform into the rim part, as shown in FIG. Figure 3 Finally, the upper mold 1 moves upward, and the ejector rod 8 ejects the formed wheel hub, as shown in FIG. Figure 4As shown; during the first step of molding, the deformation of the raw material is relatively small, and the pressure of the upper mold 1 can meet the pressure requirement. During the second step of molding, the deformation of the raw material is relatively large. At this time, the upper mold 1 and the lower mold 2 successively apply pressure to increase the pressure applied to the raw material, thereby promoting the molding of the wheel hub, thereby meeting the processing requirements of the wheel hub that requires greater pressure to mold; in the present invention, because the projection area of ​​the top of the lower mold 2 is small, when the same pressure is applied to the upper mold 1 with a relatively large projection area, a greater pressure is generated in the cavity 3 and squeezed into the second molding cavity 10 for molding the thin wall of the wheel hub.

[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 cold extrusion wheel hub primary forming device, characterized in that: The invention comprises an upper die (1), a lower die (2), a cavity (3), a first drive assembly and a second drive assembly, wherein the lower die (1) is provided with a first molding surface (4) at the bottom end, a through hole (5) is provided in the middle of the cavity (3), the lower die (2) is connected to the through hole (5) in a vertically movable manner, the top end of the lower die (2) is provided with a second molding surface (6), and the inner wall of the through hole (5) is provided with a third molding surface (7), the first drive assembly is connected to the upper die (1) and drives the upper die (1) to move vertically so that the upper die (1) and the lower die (2) are molded together, when the upper die (1) and the lower die (2) are molded together, the first molding surface (4), the second molding surface (6) and the third molding surface (7) are surrounded to form a first molding cavity (11) for molding a thick wall of a wheel hub, and the second drive assembly is connected to the lower die (2) and drives the lower die (2) to move vertically.

2. The cold extrusion hub primary forming device according to claim 1, characterized in that: It also comprises a third driving assembly, wherein a push rod (8) is vertically movably connected inside the lower mold (2), and the third driving 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).

3. The cold extrusion hub primary forming device according to claim 2, characterized in that: The upper end of the push rod (8) is located in the first molding cavity (11), and the upper end surface of the push rod (8) is provided with a fourth molding surface (9).

4. The cold extrusion hub primary forming device according to claim 3, characterized in that: The second molding surface (6) comprises, from the inside to the outside, a plane segment (61), an arc segment (62) and a conical segment (63); the plane segment (61) is connected to the conical segment (63) via the arc segment (62); and the ejector rod (8) passes through the center of the plane segment (61) and out of the second molding surface (6).

5. The cold extrusion hub primary forming device according to claim 1, characterized in that: The third molding 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); when the upper mold (1) and the lower mold (2) are molded together, the upper mold (1) is located in the upper hole (51) and the lower mold (2) is located in the lower hole (52).

6. The cold extrusion hub primary forming device according to claim 5, characterized in that: The outer peripheral wall of the lower mold (2) is provided with an annular groove along the circumferential direction to form a second molding cavity (10); the upper end of the second molding cavity (10) is connected to the first molding cavity (11).

7. The cold extrusion hub primary forming device according to claim 1, characterized in that: It also comprises a lower beam plate, the lower beam plate is connected below the cavity (3), and the second driving assembly is connected to the lower beam plate.

8. The cold extrusion hub primary forming device according to claim 1, characterized in that: The first molding surface (4) comprises a plurality of protrusions (41) protruding downwards.

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