CN213763878U - Efficient cold heading forming device - Google Patents

Abstract

The utility model provides an efficient cold heading forming device, which is used for forming automobile wheel bolts and comprises an upper die device, a lower die device and a moving device, wherein the upper die device comprises a first upper die, a second upper die, a third upper die and a fourth upper die; the lower die device comprises a first lower die, a second lower die, a third lower die and a fourth lower die; the third upper die comprises a third upper die frame, a third upper die supporting top barrel and a third upper die punch, and the inner edge of a forming hole of the third upper die frame is a circular connection hexagon; the third lower die comprises a third lower die frame, a third lower forming die, a third ejector rod, a lower forming spring, a front plate and a rear plate. The utility model discloses the structure is reliable, the shaping is stable, uses in the batch production of part, improves enterprise market competition.

Description

Efficient cold heading forming device

Technical Field

The utility model relates to a forming device field specifically relates to a cold-heading forming device of bolt that uses on efficient auto wheel.

Background

With the development of science and technology and the progress of technology, automobile products are changing day by day, and lightweight design is imperative. Automobile parts are an important field participating in globalization in the automobile industry in China, and therefore fastener products face higher requirements and need higher safety and higher cost performance to better cope with the ever-changing market. The high demands of the fasteners often require special designs to meet the needs of the user, while more advanced and sophisticated forming processes are required to support.

The wheel bolt fastener belongs to a safety part, has high requirements on the safety and reliability of parts, realizes continuous large-batch one-step forming by using a cold heading process, eliminates the potential safety hazard of the parts, and improves the reliability of the parts, which often troubles the design workers of the fastener.

Thus, the prior art fastener is also formed with a raised area.

SUMMERY OF THE UTILITY MODEL

To the defect among the prior art, the utility model aims at providing an efficient cold-heading forming device to solve prior art's problem.

According to an aspect of the present invention, an efficient cold heading forming device is provided for forming an automobile wheel bolt, the forming device includes an upper die device, a lower die device and a moving device, the upper die device and the lower die device are correspondingly disposed, the moving device is used for moving a bolt to be processed, wherein the upper die device includes a first upper die, a second upper die, a third upper die and a fourth upper die; the lower die device comprises a first lower die, a second lower die, a third lower die and a fourth lower die; the third upper die corresponds to the third lower die, and further comprises a third upper die frame, a third upper die supporting ejector sleeve and a third upper die punch, wherein the inner edge of a forming hole of the third upper die frame is a circular connection hexagon, the end surface of the third upper die punch is arranged in the forming hole, the end surface of the third upper die supporting ejector sleeve is arranged in the forming hole, and the third upper die punch is connected with the third upper die supporting ejector sleeve in a penetrating manner; the third lower die comprises a third lower die frame, a third lower forming die, a third ejector rod, a lower forming spring, a front plate and a rear plate, the front plate, the lower forming spring and the rear plate are sequentially arranged in the third lower die frame, one end of the third lower forming die is arranged in a central hole of the front plate, the other end face of the third lower forming die is connected with the rear plate, and the third ejector rod is arranged in central holes of the third lower forming die and the rear plate.

Preferably, the fourth upper die corresponds to the fourth lower die, the fourth upper die comprises a fourth upper die frame, a fourth upper die punch, an upper die spring, a spring support and a fourth upper die supporting top barrel, the fourth upper die punch, the upper die spring, the spring support and the fourth upper die supporting top barrel are arranged in a central hole of the fourth upper die frame, the end surface of the fourth upper die punch protrudes out of the end surface of the fourth upper die frame, and the end surface of the fourth upper die supporting top barrel is located in the central hole of the fourth upper die frame; the fourth lower die comprises a fourth lower die frame, a fourth lower forming die and a fourth ejector rod, the fourth lower forming die is arranged in a central hole of the fourth lower die frame, and the fourth ejector rod is inserted into and connected with a central hole of the fourth lower forming die.

Preferably, the first upper die corresponds to the first lower die, the first upper die comprises a first upper die frame and a first upper die punch, the first upper die punch is arranged in a center hole of the first upper die frame, and one end of the first upper die punch protrudes out of the center hole of the first upper die frame; the first lower die comprises a first lower die frame, a first lower forming die and a first ejector rod, the first lower forming die is arranged in a central hole of the first lower die frame, and the first ejector rod is inserted into and connected with the central hole of the first lower forming die.

Preferably, the second upper die corresponds to the second lower die, the second upper die comprises a second upper die frame and a second upper die punch, and the second upper die punch is arranged in a center hole of the second upper die frame; the second lower die comprises a second lower die frame, a second lower forming die and a second ejector rod, the second lower forming die is arranged in a central hole of the second lower die frame, and the second ejector rod is inserted into and connected with a central hole of the second lower forming die.

The design idea of this application is to design a forming process, satisfies wheel bolt one shot forming and stable continuous production, solves under the car lightweight requirement, and part one shot forming is difficult, has the technological problem of potential safety hazard to reduction in production cost satisfies customer's operation requirement, improves company market competition.

Compared with the prior art, the utility model discloses following beneficial effect has:

firstly, the concentricity of the spherical surface and the rod part of the bolt is effectively controlled, and the risks of difficult assembly, abnormal alarm and the like are avoided;

secondly, the process steps are simple and reliable, the problem that the subsequent folding caused by the deformation of the inner hole during the forming is effectively solved, and the potential safety hazard of parts is eliminated;

thirdly, this application process step is simple, combines the broaching and the hexagonal that contracts in a process step and accomplishes, and the flange shaping is good, has solved the difficult technical difficulty of one shot cold heading shaping.

Of course, it is not necessary to implement any particular embodiment of the present invention to achieve all of the above technical effects at the same time.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a perspective view of a wheel stud according to the present application;

FIG. 2 is a schematic view of the present application before forming in a first step;

FIG. 3 is a schematic view of the present application during a first step of forming;

FIG. 4 is a partially cut-away schematic view of a first step forming bolt of the present application;

FIG. 5 is a schematic view of the present application before forming in a second process step;

FIG. 6 is a schematic view of the present application during a second step of forming;

FIG. 7 is a partially cut-away schematic view of a second step of forming a bolt according to the present application;

FIG. 8 is a schematic view of the third process step of the present application before forming;

FIG. 9 is a schematic view of a third step of the present application during formation;

FIG. 10 is a partially cut-away view of a third step of forming a bolt according to the present application;

FIG. 11 is a schematic view of the present application before forming in a fourth step;

FIG. 12 is a schematic view of the present application during a fourth step of forming;

fig. 13 is a partially cut-away view of a forming bolt according to the fourth step of the present application.

Detailed Description

The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.

The present application relates to an efficient cold heading forming device for forming wheel bolts of automobiles, and please refer to fig. 1, wherein the forming device includes an upper die device (not shown), a lower die device (not shown), and a moving device (not shown), the moving device is used to move a formed product of a previous process to a next process, and the moving device may be a moving arm, a moving robot, etc., which is not within the technical scope of the present application and will not be described in detail herein.

The upper die device and the lower die device are correspondingly arranged, wherein the upper die device comprises a first upper die 10, a second upper die 20, a third upper die 30 and a fourth upper die 40; the lower die device comprises a first lower die 50, a second lower die 60, a third lower die 70 and a fourth lower die 80; before the process of closing the first upper mold 10 and the first lower mold 50, at least one cutting process is further included, that is, a process of cutting the steel material into a suitable size, which is not described in detail herein because it is out of the technical scope of the present application.

Firstly, a third process step of the present application is described, the process of the third process step is to draw holes while shrinking the hexagonal shape of the bolt, please refer to fig. 8 and 9, a forming schematic diagram of the third process step of the present application includes before and during forming, composite extrusion is adopted, and movable forming is performed in a mold cavity, so that hexagonal screwing and inner hole forming are performed synchronously, and the depth can be adjusted and controlled, thereby ensuring that the inner hole is not deformed due to shrinking the hexagonal shape, thereby solving the technical problem that one-time forming cannot be performed due to mutual restriction and influence of shrinking the hexagonal shape and drawing holes, and simultaneously keeping smooth transition of the head and the rod. The third upper die 30 corresponds to the third lower die 70, further, the third upper die 30 includes a third upper die frame 31, a third upper die supporting top cylinder 32 and a third upper die punch 33, an inner edge of a forming hole of the third upper die frame 31 is a circular joining hexagon, please refer to fig. 10, which is a schematic view of a partially cut-open third step forming bolt, as shown in the figure, an external shape of the bolt is a hexagon, a circle, an arc and a circular screw portion in sequence from right to left, the circular screw portion is a meaning that a screw is to be processed in a later process, at present, the bolt is only a circular cylinder, and it is known that an outermost side of the inner edge of the forming hole of the third upper die frame 31 is a circular hole, and then an inward side is a hexagon; as shown in fig. 8, the end face of the third upper die punch 33 is set back in the forming hole, and the inner edge of the forming hole corresponding to the position of the end face is hexagonal, when the third upper die punch 33 processes the bolt to form the inner hole, the outer surface of the processed bolt becomes hexagonal and the extra material forms a longer hexagonal length, that is, the above-mentioned simultaneous broaching of the hexagonal shrinkage; the third upper die supports a top barrel 32 and sets up in the centre bore of die carrier 31 in the third, the terminal surface that the third upper die supports a top barrel 32 sets up in the shaping hole, third upper die drift 33 through connection the third upper die supports a top barrel 32, the third upper die supports a top barrel 32 and releases the part after the shaping, makes the part not block in die carrier 31 in the third.

Referring to fig. 8 and 9, the third lower mold 70 includes a third lower mold frame 71, a third lower forming mold 72, a third ejector rod 73, a lower forming spring 74, a front plate 75 and a rear plate 76, the front plate 75, the lower forming spring 74 and the rear plate 76 are sequentially disposed in the third lower mold frame 71, one end of the third lower forming mold 72 is disposed in a central hole of the front plate 75, the other end of the third lower forming mold 72 is connected to the rear plate 76, as shown in fig. 8, the third lower forming mold 72 is supported on the rear plate 76, the rear plate 76 is used to bear the pressure transmitted by the third lower forming mold 72, the third ejector rod 63 is disposed in the central holes of the third lower forming mold 72 and the rear plate 76, the third ejector rod 63 is not only abutted against the lower surface of the machining bolt to bear the pressure transmitted by the machining bolt, and the function of ejecting the processing bolt is also realized. The front plate 75 is stressed and then acts on the lower forming spring 74, and the reaction force of the lower forming spring 74 enables the front plate 75 to be tightly attached to the third upper die 30, so that the parts cannot fly out of the third upper die 30 due to stress during forming. The third process step of the application is bolt hexagonal shrinkage and broaching, the resistance borne by the end face of the part is very large, the part is easy to fly out of the third upper die, and the lower forming spring 74 plays a role in very closing the die cavity.

Next, a fourth process step of the present application is described, the process of the fourth process step is to shape the spherical surface of the bolt and the flange, please refer to fig. 11 and 12, a schematic forming diagram of the fourth process step of the present application includes before forming and during forming, before forming the flange, the fourth upper die punch 42 can be pre-extended to the bottom of the inner hole of the bolt due to the action of the upper die spring 43, the inner hole of the part of the previous process step can be just inserted, after the device for clamping the part is removed, the part is inserted into the fourth upper die punch 42 without dropping, so as to perform the functions of receiving the material by forming and protecting the inner hole from deformation due to stress, prevent the inner hole from deforming to cause subsequent folding, and eliminate the potential safety hazard of the part. The flange and the rod part are molded in the same die cavity, so that good concentricity is ensured. The fourth upper die 40 corresponds to the fourth lower die 80, the fourth upper die 40 includes a fourth upper die frame 41, a fourth upper die punch 42, an upper die spring 43, a spring support 44 and a fourth upper die supporting top barrel 45, the fourth upper die punch 42, the upper die spring 43, the spring support 44 and the fourth upper die supporting top barrel 45 are arranged in a central hole of the fourth upper die frame 41, as shown in fig. 11, the end surface of the fourth upper die punch 42 protrudes out of the end surface of the central hole of the fourth upper die frame 41, the end surface of the fourth upper die supporting top barrel 45 is located in the central hole of the fourth upper die frame 41, and the fourth upper die punch 42 can enter an inner hole of a processing bolt to protect the inner hole and a hole wall when the die is closed.

As shown in fig. 11, the central hole of the fourth upper die frame 41 is divided into two receiving spaces, one end portions of the upper die spring 43, the spring holder 44 and the fourth upper die punch 42 are sequentially connected to the receiving space on the left side, the other end portion of the fourth upper die punch 42 is brought out of the end surface of the central hole of the fourth upper die frame 41 through the receiving space on the right side, the processing bolt is sleeved in the fourth upper die punch 42 by the moving device before forming, as shown in fig. 12, the fourth upper die punch 42 is pressed toward the spring during forming, so that the spring is in a compressed state, when the end surface of the inner hole of the processing bolt reaches the end surface of the fourth upper die supporting cylinder 45, the fourth upper die punch 42 is no longer moved, and after the pressure is released, the state as shown in fig. 11 is restored under the influence of the spring force, and as shown in the receiving space on the right side, the fourth upper die supporting cylinder 45 is disposed, the left end face of the fourth upper die supporting top cylinder 45 is supported on the partition plate between the two accommodating spaces.

The fourth lower die 80 includes a fourth lower die frame 81, a fourth lower forming die 82, and a fourth ejector rod 83, the fourth lower forming die 82 is disposed in a central hole of the fourth lower die frame 81, and the fourth ejector rod 83 is inserted into a central hole of the fourth lower forming die 82. As shown in fig. 11, the fourth lower forming die 82 and the fourth ejector pin 83 form a spherical surface for processing the bolt and an accommodating space for the circular screw portion, as shown in fig. 12, a gap exists between the fourth upper die 40 and the fourth lower die during forming, and the extruded material forms a spherical surface and a flange, please refer to a partially cut-away schematic view of the fourth step forming bolt in fig. 13, and as shown in the figure, the bolt has an external shape of a hexagon, a flange, a spherical surface and a circular screw portion in order from right to left.

Next, a first step of the present application will be described, wherein the first step is a process of machining a shrinkage rod of a bolt, please refer to fig. 2 and fig. 3, and a schematic diagram of the first step of the present application includes a step of forming a material before and during forming, wherein the first step adopts a large material for strong shrinkage, a head deformation ratio is small, and the forming is stable and reliable. The first upper die 10 corresponds to the first lower die 50, the first upper die 10 comprises a first upper die frame 11 and a first upper die punch 12, the first upper die punch 12 is arranged in a center hole of the first upper die frame 11, and one end of the first upper die punch 12 protrudes out of the center hole of the first upper die frame 11.

Further, the first lower die 50 includes a first lower die frame 51, a first lower molding die 52, and a first ejector rod 53, the first lower molding die 52 being disposed in a center hole of the first lower die frame 51, the first ejector rod 53 being inserted into a center hole connecting the first lower molding die 52. Referring to fig. 4, a first step is shown in a partially cut-away view of a formed bolt, wherein the bolt has an outer shape of two cylinders with different diameters.

Next, a second step of the present application will be described, wherein the second step is a process of shaping the bolt into a pre-hole, please refer to fig. 5 and 6, and a schematic diagram of the second step of the present application includes shaping the pre-hole in the second step before and during shaping, completing the shaping in the cavity of the movable mold, smoothly transitioning the head and the rod, having a flat end surface without burrs, and fully shaping the thick rod. The second upper die 20 corresponds to the second lower die 60, the second upper die 20 includes a second upper die carrier 21 and a second upper die punch 22, the second upper die punch 22 is disposed in a center hole of the second upper die carrier 21, and an end surface of the second upper die punch 22 is lower than an end surface of the center hole of the second upper die carrier 21; as shown in fig. 5, an end surface of the second upper die punch 22 is set retracted in the center hole of the second upper die frame 21.

In addition, the second lower mold 60 includes a second lower mold frame 61, a second lower molding die 62, and a second ejector rod 63, the second lower molding die 62 being disposed in a center hole of the second lower mold frame 61, the second ejector rod 63 being inserted into a center hole connecting the second lower molding die 62. As shown in fig. 5, the end surface of the second ejector rod 63 is connected to the bottom surface of the processing bolt, and plays a role of supporting, and shares the pressure transmitted from the second upper die 20 during molding. Referring to FIG. 7, a second step is shown in partial cross-section to form a bolt, where the bolt has been machined to form a pre-installed hole.

In summary, the process of the application comprises four steps, namely a first step, a second step, a third step and a fourth step, wherein the completed work is a first step shrinkage rod, a second step is shaped into a pre-hole, a third step shrinkage hexagonal simultaneous hole drawing, and a fourth step is used for forming a spherical surface and a flange. In the prior art, four working steps cannot be used for completion, namely the current third working step needs to be divided into two working steps, wherein the hole is drawn at the head part, and then the hexagonal head part is contracted; the structure of the wheel bolt forming machine is reliable, the forming is stable, the wheel bolt forming machine is used for batch production of wheel bolts, and the market competitiveness of enterprises is improved.

Compared with the prior art, the utility model discloses following beneficial effect has:

firstly, the concentricity of the spherical surface and the rod part of the bolt is effectively controlled, and the risks of difficult assembly, abnormal alarm and the like are avoided;

secondly, the process steps are simple and reliable, the problem that the subsequent folding caused by the deformation of the inner hole during the forming is effectively solved, and the potential safety hazard of parts is eliminated;

thirdly, this application process step is simple, combines the broaching and the hexagonal that contracts in a process step and accomplishes, and the flange shaping is good, has solved the difficult technical difficulty of one shot cold heading shaping.

The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention.

Claims (4)

1. An efficient cold heading forming device for forming automobile wheel bolts is characterized in that the forming device comprises an upper die device, a lower die device and a moving device, the upper die device and the lower die device are correspondingly arranged, the moving device is used for moving bolts to be processed, wherein,

the upper die device comprises a first upper die, a second upper die, a third upper die and a fourth upper die;

the lower die device comprises a first lower die, a second lower die, a third lower die and a fourth lower die;

the third upper die corresponds to the third lower die, and further comprises a third upper die frame, a third upper die supporting ejector sleeve and a third upper die punch, wherein the inner edge of a forming hole of the third upper die frame is a circular connection hexagon, the end surface of the third upper die punch is arranged in the forming hole, the end surface of the third upper die supporting ejector sleeve is arranged in the forming hole, and the third upper die punch is connected with the third upper die supporting ejector sleeve in a penetrating manner;

the third lower die comprises a third lower die frame, a third lower forming die, a third ejector rod, a lower forming spring, a front plate and a rear plate, the front plate, the lower forming spring and the rear plate are sequentially arranged in the third lower die frame, one end of the third lower forming die is arranged in a central hole of the front plate, the other end face of the third lower forming die is connected with the rear plate, and the third ejector rod is arranged in central holes of the third lower forming die and the rear plate.

2. The cold heading forming device according to claim 1, wherein the fourth upper die corresponds to the fourth lower die, the fourth upper die comprises a fourth upper die frame, a fourth upper die punch, an upper die spring, a spring support and a fourth upper die supporting top barrel, the fourth upper die punch, the upper die spring, the spring support and the fourth upper die supporting top barrel are arranged in a central hole of the fourth upper die frame, an end surface of the fourth upper die punch protrudes out of an end surface of the fourth upper die frame, and the end surface of the fourth upper die supporting top barrel is located in the central hole of the fourth upper die frame;

the fourth lower die comprises a fourth lower die frame, a fourth lower forming die and a fourth ejector rod, the fourth lower forming die is arranged in a central hole of the fourth lower die frame, and the fourth ejector rod is inserted into and connected with a central hole of the fourth lower forming die.

3. The cold heading forming device according to claim 2, wherein the first upper die corresponds to the first lower die, the first upper die comprises a first upper die frame and a first upper die punch, the first upper die punch is arranged in a center hole of the first upper die frame, and one end of the first upper die punch protrudes out of the center hole of the first upper die frame;

the first lower die comprises a first lower die frame, a first lower forming die and a first ejector rod, the first lower forming die is arranged in a central hole of the first lower die frame, and the first ejector rod is inserted into and connected with the central hole of the first lower forming die.

4. The cold heading forming device according to claim 3, wherein the second upper die corresponds to the second lower die, the second upper die includes a second upper die frame and a second upper die punch, and the second upper die punch is provided in a center hole of the second upper die frame;

the second lower die comprises a second lower die frame, a second lower forming die and a second ejector rod, the second lower forming die is arranged in a central hole of the second lower die frame, and the second ejector rod is inserted into and connected with a central hole of the second lower forming die.

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