Efficient cold heading device

Abstract

The present invention provides an efficient cold heading forming device for forming automobile wheel bolts, the forming device comprises an upper die device, a lower die device and a moving device, 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 cylinder and a third upper die punch, the inner edge of the forming hole of the third upper die frame is a circular connecting 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 present application has a reliable structure and stable forming, and is used for mass production of parts to improve the market competitiveness of enterprises.

Description

Technical Field

[0001] The invention relates to the field of forming devices, in particular to an efficient cold heading forming device for bolts used on automobile wheels. Background Art

[0002] With the development of science and technology, the advancement of technology, automotive products are changing with each passing day, and lightweight design is imperative. Auto parts are an important area for my country's automotive industry to participate in globalization. Therefore, fastener products face higher requirements and require higher safety and higher cost performance to better cope with the ever-changing market. The high requirements of fasteners often require some special designs to meet user needs, and at the same time require more advanced and perfect molding processes to support them.

[0003] Wheel bolt fasteners are safety parts, and they have extremely high requirements for the safety and reliability of the parts. How to use the cold heading process to achieve continuous large-scale one-time forming, eliminate the potential safety hazards of the parts, and improve the reliability of the parts often troubles fastener designers.

[0004] Therefore, there is still room for improvement in the fastener molding of the prior art. Summary of the invention

[0005] In view of the above-mentioned defects, the object of the present invention is to provide an efficient cold heading forming device to solve the problems of the prior art.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A highly efficient cold heading forming device is used for forming automobile wheel bolts. 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 arranged correspondingly. The moving device is used to move the processed bolts. 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 includes 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. Further, the third upper die includes a third upper die frame, a third upper die support top cylinder and a third upper die punch. The inner edge of the forming hole of the third upper die frame is a circular connection. The third upper die is hexagonal, the end face of the third upper die punch is arranged in the forming hole, the end face of the third upper die supporting top tube is arranged in the forming hole, and the third upper die punch is connected through the third upper die supporting top tube; the third lower die includes 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 arranged in the third lower die frame in sequence, one end of the third lower forming die is arranged in the center hole of the front plate, the other end face of the third lower forming die is connected to the rear plate, and the third ejector rod is arranged in the center holes of the third lower forming die and the rear plate.

[0008] 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 bracket and a fourth upper die support top cylinder, the fourth upper die punch, the upper die spring, the spring bracket and the fourth upper die support top cylinder are arranged in the center hole of the fourth upper die frame, the end face of the fourth upper die punch protrudes from the end face of the fourth upper die frame, and the end face of the fourth upper die support top cylinder is located in the center hole of the fourth upper die frame; the fourth lower die comprises a fourth lower die frame, a fourth lower molding die and a fourth ejector rod, the fourth lower molding die is arranged in the center hole of the fourth lower die frame, and the fourth ejector rod is inserted into the center hole connected to the fourth lower molding die.

[0009] Preferably, the first upper die corresponds to the first lower die, the first upper die includes a first upper die frame and a first upper die punch, the first upper die punch is arranged in the center hole of the first upper die frame, and one end of the first upper die punch protrudes from the center hole of the first upper die frame; the first lower die includes a first lower die frame, a first lower forming die and a first ejector rod, the first lower forming die is arranged in the center hole of the first lower die frame, and the first ejector rod is inserted into the center hole connected to the first lower forming die.

[0010] Preferably, 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 arranged in the center hole of the second upper die frame; the second lower die includes a second lower die frame, a second lower forming die and a second ejector rod, the second lower forming die is arranged in the center hole of the second lower die frame, and the second ejector rod is inserted into and connected to the center hole of the second lower forming die.

[0011] The design concept of this application is to design a molding process that can meet the one-time molding and stable continuous production of wheel bolts, and solve the technical difficulties of one-time molding of parts and potential safety hazards under the requirements of lightweight automobiles, thereby reducing production costs, meeting customer usage requirements, and improving the company's market competitiveness.

[0012] Due to the adoption of the above technical features, the present invention has the following advantages and positive effects compared with the prior art:

[0013] First, the present application effectively controls the concentricity of the bolt spherical surface and the rod, avoiding the risks of assembly difficulties and abnormal alarms;

[0014] Second, the process steps of this application are simple and reliable, which effectively solves the problem of subsequent folding caused by deformation of the inner hole during molding, eliminating the potential safety hazard of the parts;

[0015] Third, the present application has simple process steps, and the hole drawing and hexagonal shrinking are combined in one process step, and the flange is well formed, thus solving the technical difficulty of one-time cold heading forming.

[0016] Of course, any specific embodiment of the present invention does not necessarily have all of the above technical effects at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional schematic diagram of the wheel bolts of this application;

[0018] Figure 2 This is a schematic diagram of the first process step before molding of this application;

[0019] Figure 3 This is a schematic diagram of the first step of molding in this application;

[0020] Figure 4 This is a partial cutaway schematic diagram of a formed bolt in the first process step of this application;

[0021] Figure 5 This is a schematic diagram before the second step of molding in this application;

[0022] Figure 6 This is a schematic diagram of the second step of molding in this application;

[0023] Figure 7This is a partial cutaway schematic diagram of the second process step of forming a bolt in this application;

[0024] Figure 8 This is a schematic diagram before the third step of molding in this application;

[0025] Fig. 9 This is a schematic diagram of the third step of molding in this application;

[0026] Fig.10 This is a partial cross-sectional schematic diagram of the third process step of forming the bolt of this application;

[0027] Fig.11 This is a schematic diagram before molding in the fourth process step of this application;

[0028] Fig.12 This is a schematic diagram of the fourth step of molding in this application;

[0029] Fig.13 This is a partial cross-sectional schematic diagram of the fourth step of forming the bolt in this application. DETAILED DESCRIPTION

[0030] Several preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to enable the public to have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, processes, components, etc. are not described in detail.

[0031] This application is a highly efficient cold heading forming device for forming automobile wheel bolts. Figure 1 The wheel bolts formed in the present application, the forming device includes an upper mold device (not shown), a lower mold device (not shown) and a moving device (not shown), the moving device is used to move the molded product of the previous process to the next process, the moving device can be a mobile arm, a mobile robot, etc., which does not belong to the technical scope of the present application and is not described in detail here.

[0032] The upper mold device and the lower mold device are arranged correspondingly, wherein the upper mold device includes a first upper mold 10, a second upper mold 20, a third upper mold 30 and a fourth upper mold 40; the lower mold device includes a first lower mold 50, a second lower mold 60, a third lower mold 70 and a fourth lower mold 80; before the first upper mold 10 and the first lower mold 50 are closed, at least one cutting process is included, that is, a process of cutting the steel into a suitable size, because it does not belong to the technical scope of the present application, it is not described in detail here.

[0033] First, the third step of the present application is described. The process of the third step is to process the hexagonal bolt while drawing the hole. Please refer to Figure 8 and Fig. 9 , the third step forming schematic diagram of the present application, including before and during forming, using composite extrusion, active forming in the mold cavity, so that the hexagonal wringing and inner hole forming are carried out simultaneously, and the depth can be adjusted and controlled to ensure that the inner hole does not deform due to shrinking the hexagon, thereby solving the technical problem that the shrinking of the hexagon and the pulling of the hole restrict each other and cannot be formed in one time, while the head and the rod maintain a smooth transition. The third upper mold 30 corresponds to the third lower mold 70. Further, the third upper mold 30 includes a third upper mold frame 31, a third upper mold support top cylinder 32 and a third upper mold punch 33. The inner edge of the forming hole of the third upper mold frame 31 is a circular connecting hexagon. Please refer to Fig.10 The third step is a partial cross-section diagram of the bolt. As shown in the figure, the external shapes of the bolt are hexagonal, circular, arc-shaped and circular screw parts from right to left. The circular screw part means that it will be processed into a screw here in the future process. At present, it is just a circular cylinder. It can be seen that the outermost side of the inner edge of the forming hole of the third upper mold frame 31 is a circular hole, and then it is hexagonal inward; Figure 8 As shown, the end face of the third upper die punch 33 is indented in the forming hole, and the inner edge of the forming hole corresponding to the position of this 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, which is the above-mentioned shrinking of the hexagon and pulling the hole at the same time; the third upper die support top cylinder 32 is arranged in the center hole of the third upper die frame 31, and the end face of the third upper die support top cylinder 32 is arranged in the forming hole, and the third upper die punch 33 is connected to the third upper die support top cylinder 32, and the third upper die support top cylinder 32 pushes out the parts after forming, so that the parts are not stuck in the third upper die frame 31.

[0034] Also, please refer to Figure 8 and Fig. 9 The third lower mold 70 includes a third lower mold frame 71, a third lower molding mold 72, a third ejector rod 73, a lower molding spring 74, a front plate 75 and a rear plate 76. The front plate 75, the lower molding spring 74 and the rear plate 76 are sequentially arranged in the third lower mold frame 71. One end of the third lower molding mold 72 is arranged in the center hole of the front plate 75, and the other end surface of the third lower molding mold 72 is connected to the rear plate 76. Figure 8As shown, the connection method is to support on the rear plate 76, and use the rear plate 76 to bear the pressure transmitted from the third lower molding die 72. The third ejector rod 63 is arranged in the center hole of the third lower molding die 72 and the rear plate 76. In addition to being pressed against the lower surface of the processing bolt to bear the pressure transmitted from the processing bolt, the third ejector rod 63 also has the function of ejecting the processing bolt. After the front plate 75 is subjected to force, it acts on the lower molding spring 74. The reaction force of the lower molding spring 74 enables the front plate 75 to fit tightly with the third upper mold 30, ensuring that the part will not fly out of the third upper mold 30 due to force during molding. The third process step of this application is to shrink the hexagon of the bolt and pull the hole. The resistance on the end face of the part is very large, and it is easy to fly out of the third upper mold. The lower molding spring 74 plays a role in closing the mold cavity.

[0035] Next, the fourth step of the present application is described. The process of the fourth step is to process the spherical surface of the bolt and the forming of the flange. Please refer to Fig.11 and Fig.12 , the fourth step forming schematic diagram of the present application, including before and during forming, before the flange is formed, the fourth upper die punch 42 will be pre-extended to the bottom of the inner hole of the processing bolt due to the action of the upper die spring 43, and the inner hole of the part in the previous step can just fit in. When the device for clamping the part is removed, the part will not fall off when it is sleeved on the fourth upper die punch 42, which plays the role of forming the material and protecting the inner hole from deformation due to force, preventing the deformation of the inner hole from causing subsequent folding, and eliminating the safety hazard of the part. The flange and the rod are formed in the same mold cavity to ensure good concentricity. The fourth upper die 40 corresponds to the fourth lower die 80, and 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 bracket 44 and a fourth upper die support top cylinder 45. The fourth upper die punch 42, the upper die spring 43, the spring bracket 44 and the fourth upper die support top cylinder 45 are arranged in the center hole of the fourth upper die frame 41, as shown in FIG. Fig.11 As shown, the end face of the fourth upper die punch 42 protrudes from the end face of the center hole of the fourth upper die frame 41, and the end face of the fourth upper die support top cylinder 45 is located in the center hole of the fourth upper die frame 41. The purpose of this design is that when the mold is closed, the fourth upper die punch 42 can enter the inner hole of the processing bolt to protect the inner hole and the hole wall.

[0036] like Fig.11 As shown, the center hole of the fourth upper die frame 41 is divided into two accommodating spaces, the upper die spring 43, the spring bracket 44 and one end of the fourth upper die punch 42 are sequentially connected to the accommodating space on the left, and the other end of the fourth upper die punch 42 passes through the accommodating space on the right to the outside of the end surface of the center hole of the fourth upper die frame 41. Before forming, the moving device sets the processing bolt on the fourth upper die punch 42. Fig.12As shown, during forming, the fourth upper die punch 42 is pressed against the spring after being compressed, so that the spring is in a compressed state. When the inner hole end face of the processed bolt reaches the end face of the fourth upper die support top cylinder 45, the fourth upper die punch 42 no longer moves, and after the pressure is released, it returns to the state as shown in FIG. Fig.11 As shown in the figure, the fourth upper mold supporting top cylinder 45 is arranged in the accommodating space on the right side, and the left end surface of the fourth upper mold supporting top cylinder 45 is supported on the partition sheet between the two accommodating spaces.

[0037] The fourth lower mold 80 includes a fourth lower mold frame 81, a fourth lower molding mold 82 and a fourth ejector rod 83. The fourth lower molding mold 82 is arranged in the center hole of the fourth lower mold frame 81, and the fourth ejector rod 83 is inserted into the center hole of the fourth lower molding mold 82. Fig.11 As shown, the fourth lower molding die 82 and the fourth ejector rod 83 form a spherical surface of the processing bolt and an accommodating space for the circular screw portion, as shown in FIG. Fig.12 As shown, during molding, there is a gap between the fourth upper mold 40 and the fourth lower mold, and the extruded material forms a spherical surface and a flange, please refer to Fig.13 The schematic diagram of the partial cross-section of the formed bolt in the fourth process step. As shown in the figure, the external shapes of the bolt are hexagonal, flange, spherical and circular screw parts from right to left.

[0038] Next, the first step of the present application is described. The process of the first step is to process the shrinkage rod of the bolt. Please refer to Figure 2 and Figure 3 , the first step forming schematic diagram of the present application, including before and during forming, the first step adopts large material strong shrinkage, the 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 includes a first upper die frame 11 and a first upper die punch 12, the first upper die punch 12 is set in the center hole of the first upper die frame 11, and one end of the first upper die punch 12 protrudes from the center hole of the first upper die frame 11.

[0039] In addition, the first lower mold 50 includes a first lower mold frame 51, a first lower molding mold 52 and a first ejector rod 53. The first lower molding mold 52 is disposed in the center hole of the first lower mold frame 51, and the first ejector rod 53 is inserted into the center hole of the first lower molding mold 52. Figure 4 The schematic diagram of the partial cross-section of the formed bolt in the first step is shown in the figure. As shown in the figure, the external shape of the bolt is two cylinders with different diameters.

[0040] Next, the second step of the present application is described. The process of the second step is to shape the bolt into a pre-hole. Please refer to Figure 5 and Figure 6, the second step forming schematic diagram of the present application, including before and during forming, the second step is shaped into a pre-hole, which is completed in the movable mold cavity, the head and the rod are smoothly transitioned, the end surface is flat and burr-free, and the thick rod part is formed full. The second upper mold 20 corresponds to the second lower mold 60, and the second upper mold 20 includes a second upper mold frame 21 and a second upper mold punch 22. The second upper mold punch 22 is set in the center hole of the second upper mold frame 21, and the end surface of the second upper mold punch 22 is lower than the end surface of the center hole of the second upper mold frame 21; Figure 5 As shown, the end surface of the second upper die punch 22 is retracted and arranged in the center hole of the second upper die frame 21 .

[0041] In addition, the second lower mold 60 includes a second lower mold frame 61, a second lower molding mold 62, and a second ejector rod 63. The second lower molding mold 62 is disposed in the center hole of the second lower mold frame 61, and the second ejector rod 63 is inserted into the center hole of the second lower molding mold 62. Figure 5 As shown, the end surface of the second ejector rod 63 is connected to the bottom surface of the processed bolt, playing a supporting role and sharing the pressure from the second upper mold 20 during molding. Figure 7 The schematic diagram of the partial cross-section of the second step forming bolt. As shown in the figure, a pre-installed hole has been formed in the processed bolt.

[0042] In summary, the process of the present application includes four steps, namely the first step, the second step, the third step and the fourth step. The work completed is the first step of shrinking the rod, the second step of shaping into a pre-hole, the third step of shrinking the hexagonal and drawing the hole at the same time, and the fourth step of forming the spherical surface and flange. It is impossible to complete it with four steps under the existing technology, that is, the current third step needs to be divided into two steps, first drawing the hole in the head, and then shrinking the hexagonal head; the present application has a reliable structure and stable forming, and is used in the mass production of wheel bolts to improve the market competitiveness of enterprises.

[0043] In summary, due to the adoption of the above technical features, the present invention has the following advantages and positive effects compared with the prior art:

[0044] First, the present application effectively controls the concentricity of the bolt spherical surface and the rod, avoiding the risks of assembly difficulties and abnormal alarms;

[0045] Second, the process steps of this application are simple and reliable, which effectively solves the problem of subsequent folding caused by deformation of the inner hole during molding, eliminating the potential safety hazard of the parts;

[0046] Third, the present application has simple process steps, and the hole drawing and hexagonal shrinking are combined in one process step, and the flange is well formed, thus solving the technical difficulty of one-time cold heading forming.

[0047] The preferred embodiments of the invention are only used to help illustrate the invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made based on the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the invention, so that technicians in the relevant technical field can make good use of the invention. The present invention is only limited by the claims and their full scope and equivalents. The above disclosure is only the preferred embodiment of the present invention, but it is not intended to limit itself. Any equivalent changes and modifications made by any technician familiar with the art without violating the spirit and connotation of the invention should fall within the scope of protection of the present invention.

Claims

1. An efficient cold heading forming device for forming automobile wheel bolts, characterized in that: The molding device comprises an upper mold device, a lower mold device and a moving device, wherein the upper mold device and the lower mold device are arranged correspondingly, and the moving device is used to move the processed bolts, wherein: The upper mold device includes a first upper mold, a second upper mold, a third upper mold and a fourth upper mold; The lower mold device comprises a first lower mold, a second lower mold, a third lower mold and a fourth lower mold; The third upper die corresponds to the third lower die. Further, the third upper die includes a third upper die frame, a third upper die support top cylinder and a third upper die punch. The inner edge of the forming hole of the third upper die frame is a circular connecting hexagon. The end face of the third upper die punch is arranged in the forming hole. The end face of the third upper die support top cylinder is arranged in the forming hole. The third upper die punch penetrates and connects the third upper die support top cylinder. The third lower mold includes a third lower mold frame, a third lower molding mold, a third ejector rod, a lower molding spring, a front plate and a rear plate. The front plate, the lower molding spring and the rear plate are sequentially arranged in the third lower mold frame, one end of the third lower molding mold is arranged in the center hole of the front plate, the other end surface of the third lower molding mold is connected to the rear plate, and the third ejector rod is arranged in the center holes of the third lower molding mold and the rear plate.

2. The cold heading forming device according to claim 1, characterized in that: The fourth upper die corresponds to the fourth lower die, and the fourth upper die includes a fourth upper die frame, a fourth upper die punch, an upper die spring, a spring bracket and a fourth upper die support top cylinder, the fourth upper die punch, the upper die spring, the spring bracket and the fourth upper die support top cylinder are arranged in the center hole of the fourth upper die frame, the end surface of the fourth upper die punch protrudes from the end surface of the fourth upper die frame, and the end surface of the fourth upper die support top cylinder is located in the center hole of the fourth upper die frame; The fourth lower mold comprises a fourth lower mold frame, a fourth lower molding mold and a fourth ejector rod. The fourth lower molding mold is arranged in the center hole of the fourth lower mold frame, and the fourth ejector rod is inserted into the center hole connected to the fourth lower molding mold.

3. The cold heading forming device according to claim 2, characterized in that: 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 the center hole of the first upper die frame, and one end of the first upper die punch protrudes from the center hole of the first upper die frame; The first lower mold comprises a first lower mold frame, a first lower molding mold and a first ejector rod. The first lower molding mold is arranged in a central hole of the first lower mold frame, and the first ejector rod is inserted into the central hole connected to the first lower molding mold.

4. The cold heading forming device according to claim 3, characterized in that: 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 central hole of the second upper die frame; The second lower mold comprises a second lower mold frame, a second lower molding mold and a second ejector rod. The second lower molding mold is arranged in the center hole of the second lower mold frame, and the second ejector rod is inserted and connected to the center hole of the second lower molding mold.

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