Forming die for cylindrical shell of automobile universal joint

Abstract

The utility model discloses an automobile universal joint cylindrical shell forming die which comprises a bottom plate, a first cushion block and a second cushion block are symmetrically arranged on the bottom plate, a lower die is arranged on the first cushion block and the second cushion block, a cylindrical cavity is formed in the middle of the lower die, the cylindrical cavity penetrates through the upper side wall of the lower die, and the upper side wall of the lower die is provided with a lower die. The inner bottom wall of the cylindrical cavity is provided with a vertical guide hole penetrating through the lower die downwards. The forging die has the advantages that the roller path cavity is formed in the cylindrical cavity of the lower die, the roller path column is fixedly arranged on the outer side of the column die, the forge piece between the column die and the cylindrical cavity is deformed by hammering the stress table and is finally forged and formed, the cylindrical inner cavity and the strip-shaped roller path of the forge piece are primarily formed in the forging process, and only trimming and polishing are needed; the production efficiency of the universal joint cylindrical shell is improved to a certain extent, meanwhile, the wall thickness of the cylindrical shell is uniform, and the problem that the wall thickness of a roller path is unreasonable is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of workpiece forging, in particular to a forming die for a cylindrical shell of an automobile universal joint. Background Art

[0002] The universal joint is responsible for the flexible connection between the vehicle's drive shaft and the wheels and for transmitting torque. The VL universal joint is widely used because of its short axial dimension, large turning angle, and ability to shorten the vehicle's steering space. It consists of a star-shaped sleeve, a retaining frame, steel balls, and a cylindrical shell. The inside of the cylindrical shell requires a strip raceway for the steel balls to be distributed circumferentially.

[0003] When manufacturing a cylindrical shell, the shape of the cylindrical shell is usually obtained by forging the tire membrane, and then subsequent machining is performed to obtain a strip raceway. Since the cylindrical shell with the raceway is formed in two steps, the production efficiency of the universal joint cylindrical shell is reduced. Moreover, since a raceway is provided on the cylindrical shell, the wall thickness of the cylindrical shell is uneven, and the wall thickness at the raceway is smaller than that at other positions. Also, since the raceway has to bear the main friction, the wall thickness of the cylindrical shell is not set reasonably.

[0004] In order to solve the above problems, we proposed a forming die for a cylindrical shell of an automobile universal joint. Utility Model Content

[0005] The utility model aims to solve the problems in the background technology and proposes a forming die for a cylindrical shell of a universal joint for an automobile.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A forming die for a cylindrical shell of a universal joint for an automobile, comprising a bottom plate, on which a cushion block 1 and a cushion block 2 are symmetrically arranged, a lower die is arranged on the cushion block 1 and the cushion block 2, a cylindrical cavity is opened in the middle of the lower die, the cylindrical cavity passes through the upper side wall of the lower die, a guide hole vertically passing through the lower die downward is opened in the inner bottom wall of the cylindrical cavity, a plurality of vertical raceway cavities are opened in the inner side wall of the cylindrical cavity, the raceway cavities are evenly spaced along the circumferential inner wall of the cylindrical cavity, two connecting seats are symmetrically fixed to the outer wall of the lower die, a pressing plate is arranged on the upper side of the lower die, a vertical downward column die is fixedly connected to the middle part of the lower side wall of the pressing plate, the column die matches the cylindrical cavity, a raceway column matching the raceway cavity is fixedly connected to the outer wall of the column die, the upper end of the raceway column is connected to the The cam is secured to the bottom of the base plate and is adapted to engage the cams and engage with the bottom plate to engage with the bottom plate, the cams being secured to the bottom of the base plate and being adapted to engage with the cams and engage with the bottom plate to engage with the bottom plate.

[0008] In order to better achieve the above-mentioned purpose, the utility model adopts a further technical solution: an annular groove is provided on the outer wall of the force-bearing platform.

[0009] In order to better achieve the above purpose, the utility model adopts a further technical solution: positioning holes are provided at the four corners of the bottom plate.

[0010] In order to better achieve the above-mentioned purpose, the utility model adopts a further technical solution: a positioning platform is fixedly connected to the middle part of the lower side wall of the lower mold, and an avoidance hole is opened in the middle part of the positioning platform.

[0011] The advantages of the utility model are as follows: a raceway cavity is opened in the cylindrical cavity of the middle and lower molds of the utility model, a raceway column is fixedly arranged on the outer side of the column mold, and the forging between the column mold and the cylindrical cavity is deformed by hammering the force-bearing platform, and finally forged into shape. Since the cylindrical inner cavity and the strip raceway of the forging are initially formed during the forging process, only trimming and polishing are required, which improves the production efficiency of the universal joint cylindrical shell to a certain extent. At the same time, the wall thickness of the cylindrical shell is uniform, which solves the problem of unreasonable raceway wall thickness. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is an appearance diagram of a cylindrical shell forming mold for a car universal joint proposed by the utility model;

[0013] Figure 2 This is one of the structural decomposition schematic diagrams of a cylindrical shell forming mold for a car universal joint proposed by the utility model;

[0014] Figure 3 This is the second structural decomposition schematic diagram of a cylindrical shell forming mold for an automobile universal joint proposed by the utility model.

[0015] In the figure: 1 bottom plate, 2 cushion block 1, 3 cushion block 2, 4 lower die, 5 cylindrical cavity, 6 guide hole, 7 raceway cavity, 8 connecting seat, 9 pressure plate, 10 column die, 11 raceway column, 12 force platform, 13 support seat, 14 top column, 15 washer, 16 positioning hole, 17 annular groove, 18 positioning platform. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0017] Reference Figure 1-Figure 3 As shown, a forming die for a cylindrical shell of a universal joint for an automobile comprises a base plate 1, on which a pad 1 2 and a pad 2 3 are symmetrically arranged, the pad 1 2 and the pad 2 3 are arranged in an arc shape, a lower die 4 is arranged on the pad 1 2 and the pad 2 3, the lower die 4 is arranged in a vertical column shape, a positioning platform 18 is fixedly connected to the middle part of the lower side wall of the lower die 4, a cylindrical cavity 5 is opened in the middle part of the lower die 4, the positioning platform 18 is conducive to the rapid positioning of the pad 1 2 and the pad 2 3, when the pad 1 2 and the pad 2 3 are in contact with the outer wall of the positioning platform 18, the pad 1 2 and the pad 2 3 will correspond to the middle part of the lower die 4, and the pad 1 2 and the pad 2 3 play a role in supporting the lower die 4 during the forging process.

[0018] The cylindrical cavity 5 passes through the upper side wall of the lower mold 4, and a vertical guide hole 6 is provided on the inner bottom wall of the cylindrical cavity 5 and passes through the lower mold 4 downward. The guide hole 6 is used to form the shaft rod located outside the cylindrical shell of the universal joint. An avoidance hole is provided in the middle of the positioning platform 18, and the size of the avoidance hole is larger than the size of the guide hole 6. A plurality of vertical raceway cavities 7 are provided on the inner side wall of the cylindrical cavity 5, and the raceway cavities 7 are evenly spaced along the circumferential inner wall of the cylindrical cavity 5. Two connecting seats 8 are symmetrically fixed to the outer wall of the lower mold 4, and a pressure plate 9 is provided on the upper side of the lower mold 4. The diameter is equal to the outer diameter of the lower die 4. A vertical downward column mold 10 is fixedly connected to the middle of the lower side wall of the pressure plate 9. The column mold 10 matches the cylindrical cavity 5. The outer wall of the column mold 10 is fixedly connected to a roller column 11 that matches the roller cavity 7. The upper end of the roller column 11 is fixedly connected to the lower side wall of the pressure plate 9. Through the cooperation of the roller column 11 and the roller cavity 7, a strip roller is formed on the forging, and the wall thickness at the roller position is equal to the wall thickness at other positions of the cylindrical shell, which improves the rationality of the roller wall thickness relative to the wall thickness at other positions of the cylindrical shell.

[0019] The upper side wall of the pressing plate 9 is fixedly connected to a force-bearing platform 12 located in the middle of the pressing plate 9. During the forging process, the press forges the force-bearing platform 12 to forge the forging between the column mold 10 and the cylindrical cavity 5. An annular groove 17 is provided on the outer wall of the force-bearing platform 12. The annular groove 17 is used to set a clamp, and the column mold 10 is separated from the lower mold 4 by lifting the clamp.

[0020] A mold frame is arranged on the outer side of the lower mold 4 and the force-bearing platform 12, and the mold frame is fixedly connected to the base plate 1. A horizontally arranged hydraulic cylinder 1 is fixedly connected between cushion block 1 2 and cushion block 2 3 and the mold frame, and a vertically arranged hydraulic cylinder 2 is fixedly connected between the two connecting seats 8 and the mold frame.

[0021] A material pushing mechanism is provided on the base plate 1 and is located between the pad 1 2 and the pad 2 3. The material pushing mechanism includes a support seat 13 fixedly connected to the base plate 1. A vertical upward push column 14 is fixedly provided on the upper side of the support seat 13. The push column 14 matches the guide hole 6 and is slidably inserted in the guide hole 6. A washer 15 located on the lower side of the lower mold 4 is provided on the outer movable sleeve of the push column 14. A spring is fixedly connected between the washer 15 and the support seat 13. The spring causes the washer 15 to generate an upward thrust on the positioning platform 18 to reduce the load on the mold frame. Positioning holes 16 are provided at the four corners of the base plate 1. The positioning holes 16 are used to insert bolts. The base plate 1 is fixedly connected to the ground by the bolts to improve the stability of the mold.

Claims

1. A cylindrical shell forming die for a car universal joint, comprising a base plate (1), characterized in that: The bottom plate (1) is symmetrically provided with a cushion block 1 (2) and a cushion block 2 (3), and a lower mold (4) is provided on the cushion block 1 (2) and the cushion block 2 (3). A cylindrical cavity (5) is provided in the middle of the lower mold (4), and the cylindrical cavity (5) passes through the upper side wall of the lower mold (4). A vertical guide hole (6) that passes through the lower mold (4) downward is provided on the inner bottom wall of the cylindrical cavity (5), and a plurality of vertical roller cavities (7) are provided on the inner side wall of the cylindrical cavity (5). The roller cavities (7) are arranged along the The circumferential inner wall of the cylindrical cavity (5) is evenly spaced, and two connecting seats (8) are symmetrically fixed on the outer wall of the lower mold (4). A pressure plate (9) is arranged on the upper side of the lower mold (4), and a column mold (10) vertically downward is fixedly connected to the middle of the lower side wall of the pressure plate (9), and the column mold (10) matches the cylindrical cavity (5). The outer wall of the column mold (10) is fixedly connected to a roller column (11) that matches the roller cavity (7), and the upper end of the roller column (11) is fixed to the lower end of the pressure plate (9). The side walls are fixedly connected, the upper side wall of the pressing plate (9) is fixedly connected to a force-bearing platform (12) located in the middle of the pressing plate (9), and a material-lifting mechanism located between the cushion block 1 (2) and the cushion block 2 (3) is arranged on the bottom plate (1), and the material-lifting mechanism includes a support seat (13) fixedly connected to the bottom plate (1), and a vertically upward lifting column (14) is fixedly arranged on the upper side of the support seat (13), and the lifting column (14) matches the guide hole (6) and is slidably inserted in the guide hole (6), The outer movable sleeve of the top column (14) is provided with a gasket (15) located at the lower side of the lower mold (4), a spring is fixedly connected between the gasket (15) and the support seat (13), a mold frame is arranged on the outer side of the lower mold (4) and the force-bearing platform (12), the mold frame is fixedly connected to the bottom plate (1), a horizontally arranged hydraulic cylinder 1 is fixedly connected between the cushion block 1 (2) and the cushion block 2 (3) and the mold frame, and a vertically arranged hydraulic cylinder 2 is fixedly connected between the two connecting seats (8) and the mold frame.

2. The automotive universal joint cylindrical shell forming mold according to claim 1, characterized in that: An annular groove (17) is formed on the outer wall of the force-bearing platform (12).

3. The automotive universal joint cylindrical shell forming mold according to claim 1, characterized in that: Positioning holes (16) are provided at the four corners of the bottom plate (1).

4. The automotive universal joint cylindrical shell forming mold according to claim 1, characterized in that: A positioning platform (18) is fixedly connected to the middle portion of the lower side wall of the lower mold (4), and a avoidance hole is provided in the middle portion of the positioning platform (18).

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