Forming device for serrated bolt and serrated bolt

Abstract

The present invention provides a forming device for a toothed bolt, the toothed bolt comprising a head flange, a first rod body and a second rod body, the first rod body being a toothed rod, the second rod body being a step rod, a guide rod body being connected between the first rod body and the head flange, the forming device comprising a fifth mold for forming a preset blank formed with the head flange and the guide rod body into the first rod body and the second rod body, the fifth mold comprising a correspondingly arranged fifth main mold and a fifth punch die, the fifth main mold cavity of the fifth main mold comprising a first section and a second section connected to the first section, the first section being located between the fifth punch die ejector pin and the second section in the direction in which the fifth punch die pad moves, the first section being used to form the first rod body, the second section being used to form the second rod body, a first portion connected to the first section gradually shrinks from an end of the guide rod body away from the head flange toward the second portion, an inner wall of the first portion forms an angle α of 15°-17° with the axis of the main mold cavity, so that the axial length of the tooth after forming reaches a preset value, and there is no overlapping mark during forming.

Description

Technical Field

[0001] The invention belongs to the field of fastener forming, and in particular relates to a forming device for a toothed bolt and a toothed bolt. Background Art

[0002] Screws are a very common fastener. They are tools that use the physical and mathematical principles of the circular rotation of an object's inclined surface and friction to gradually fasten objects and parts. They are an indispensable industrial necessity in daily life: such as the extremely small screws used in cameras, glasses, clocks, electronics, etc.; the general screws used in televisions, electrical products, musical instruments, and furniture; large screws and nuts used in engineering, construction, and bridges; transportation equipment, airplanes, trams, cars, etc. use both large and small screws. This shows that screws have important tasks in industry, so the output and quality of screws are crucial.

[0003] The rich application scenarios require a wide variety of styles, such as forming flower teeth on the screw rod, the screw rod is a step rod, the screw head is round, hexagonal, square, etc., while in the traditional process, the flower teeth are generally formed by rubbing with a rubbing plate. This process is not only inefficient, labor-intensive, and has a high machine utilization rate, but the flower teeth after forming will not be full and beautiful. Therefore, people are gradually trying to use cold heading technology to form flower teeth. Although the cold heading process for forming flower teeth is fast, the flower teeth are formed at the lower end of the head flange, and the length of the guide rod between the flower teeth and the head flange is very short. Due to the structural problems of the mold and the factors of forming force control, the effective length of the flower teeth formed on the rod is often insufficient, or there are overlap marks after the flower teeth are formed, resulting in poor products. Therefore, how to improve the mold to make the flower teeth excellent is still a problem worth exploring. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the main purpose of the present invention is to provide a forming device for a toothed bolt and a toothed bolt. The provided toothed bolt forming device has a fifth main mold cavity of a fifth mold having a first section and a second section connected to the first section, the first section being a toothed cavity section for forming a first rod body of the toothed bolt, the second section being a step cavity section for forming a second rod body of the toothed bolt, the inner wall of the first part of the first section away from the second section forms an angle α of 15°-17° with the axis of the fifth main mold cavity, for providing a preset blank formed with a head flange and a guide rod body into the mold, thereby ensuring that the axial length of the tooth after forming reaches a preset value, and there is no overlapping mark during forming, thereby ensuring product quality.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] The present invention provides a forming device for a serrated bolt. The serrated bolt includes a head flange, a first rod body and a second rod body. The first rod body is a serrated rod, and the second rod body is a stepped rod. A guiding rod body is connected between the first rod body and the head flange. The forming device includes:

[0007] A fifth mold, which is used to form the first rod body and the second rod body on a preset blank formed with a head flange and a guiding rod body. The fifth mold includes a correspondingly arranged fifth main mold and a fifth punching mold. The fifth main mold includes a fifth main mold shell, a fifth main mold spacer block, a fifth main mold ejector pin and a fifth main mold core arranged in the fifth main mold shell. The fifth main mold core has a fifth main mold cavity with an opening facing the fifth punching mold. The fifth main mold ejector pin penetrates into the fifth main mold cavity from the bottom of the fifth main mold core.

[0008] The fifth punching mold includes a fifth punching mold shell, a fifth punching mold core, a fifth punching mold spacer block and a fifth punching mold ejector pin arranged in the fifth punching mold shell. One end of the fifth punching mold ejector pin is connected to the fifth punching mold spacer block, and the other end of the fifth punching mold ejector pin faces the fifth main mold cavity. When the fifth main mold and the fifth punching mold are in a closed mold state, the fifth punching mold spacer block moves in the direction towards the fifth main mold, so that the fifth punching mold ejector pin feeds the preset blank into the fifth main mold cavity. The fifth main mold ejector pin abuts against the end of the second preset rod of the preset blank that deviates from the head flange, and the head flange of the preset blank faces the fifth punching mold.

[0009] Wherein, the fifth main mold cavity has a first section and a second section connected to the first section. The first section is located between the fifth punching mold ejector pin and the second section in the moving direction of the fifth punching mold spacer block, and the first section is a serrated cavity section for forming the first rod body, and the second section is a stepped cavity section for forming the second rod body. The first part where the first section is connected to the second section tapers from the end of the guiding rod body that deviates from the head flange towards the second section. The inner wall of the first part forms an angle α with the axis of the fifth main mold cavity, and the angle α is 15°-17°.

[0010] As a further description of the above technical solution, the forming device further includes:

[0011] A first mold, which is used to shape the preset blank.

[0012] A second mold, which is used to form a first preset rod and a second preset rod on the preset blank after shaping. The rod diameter of the first preset rod is larger than that of the second preset rod.

[0013] The third mold, which is used to form the upper section of the first preset rod away from the second preset rod into a preset flange;

[0014] The fourth mold, which is used to finish the diameter of the preset flange and form the head flange and the guide rod body connected under the head flange.

[0015] As a further description of the above technical solution, the forming device further includes a shearing mechanism, which is used to cut the wire into the preset blank.

[0016] As a further description of the above technical solution, the shearing mechanism is scissors or a shearing die.

[0017] As a further description of the above technical solution, the forming device further includes a feeding mechanism, which is used to feed materials between the first mold, the second mold, the third mold, the fourth mold and the fifth mold.

[0018] As a further description of the above technical solution, the first mold includes a correspondingly arranged first main mold and first punching die;

[0019] The first main mold includes a first main mold shell, a first main mold cushion block, a first main mold ejector pin and a first main mold core arranged in the first main mold shell. The first main mold core has a first main mold cavity with an opening facing the first punching die, and the first main mold ejector pin penetrates into the first main mold cavity from the bottom of the first main mold core;

[0020] The first punching die includes a first punching die shell, a first punching die cushion block and a first punching die ejector pin arranged in the first punching die shell. One end of the first punching die ejector pin is connected to the first punching die cushion block, and the other end of the first punching die ejector pin penetrates out of the first punching die shell and faces the first main mold cavity.

[0021] As a further description of the above technical solution, the second mold includes a correspondingly arranged second main mold and second punching die;

[0022] The second main mold includes a second main mold shell, a second main mold cushion block, a second main mold ejector pin and a second main mold core arranged in the second main mold shell. The second main mold core has a second main mold cavity with an opening facing the second punching die, and the second main mold ejector pin penetrates into the second main mold cavity from the bottom of the second main mold core;

[0023] The second punching die includes a second punching die shell, a second punching die cushion block and a second punching die ejector pin arranged in the second punching die shell. One end of the second punching die ejector pin is connected to the second punching die cushion block, and the other end of the second punching die ejector pin penetrates out of the second punching die shell and faces the second main mold cavity.

[0024] As a further description of the above technical solution, the third mold includes a correspondingly arranged third main mold and a third punching mold;

[0025] The third main mold includes a third main mold shell, a third main mold spacer block, a third main mold ejector pin and a third main mold core arranged in the third main mold shell. The third main mold core has a third main mold cavity with an opening facing the third punching mold. The third main mold ejector pin penetrates into the third main mold cavity from the bottom of the third main mold core;

[0026] The third punching mold includes a third punching mold shell, a third punching mold core, a third punching mold spacer block and a third punching mold ejector pin arranged in the third punching mold shell. One end of the third punching mold ejector pin is connected to the third punching mold spacer block, and the other end of the third punching mold ejector pin passes through the third punching mold shell and the third punching mold core and faces the third main mold cavity.

[0027] As a further description of the above technical solution, the fourth mold includes a correspondingly arranged fourth main mold and a fourth punching mold;

[0028] The fourth main mold includes a fourth main mold shell, a fourth main mold spacer block, a fourth main mold ejector pin and a fourth main mold core arranged in the fourth main mold shell. The fourth main mold core has a fourth main mold cavity with an opening facing the fourth punching mold. The fourth main mold ejector pin penetrates into the fourth main mold cavity from the bottom of the fourth main mold core;

[0029] The fourth punching mold includes a fourth punching mold shell, a fourth punching mold core, a fourth punching mold spacer block and a fourth punching mold ejector pin arranged in the fourth punching mold shell. One end of the fourth punching mold ejector pin is connected to the fourth punching mold spacer block, and the other end of the fourth punching mold ejector pin passes through the fourth punching mold shell and the fourth punching mold core and faces the fourth main mold cavity.

[0030] The present invention also provides a serrated bolt, which includes a head flange, a first rod body and a second rod body. The first rod body is a serrated rod, the second rod body is a stepped rod, and a guiding rod body is connected between the first rod body and the head flange;

[0031] The second rod body includes a first stepped rod, a second stepped rod and a third stepped rod. The first stepped rod, the second stepped rod and the third stepped rod are sequentially connected from one end of the head flange, and their rod diameters decrease sequentially;

[0032] The first stepped rod is formed with a first thread, and the second stepped rod is formed with a second thread.

[0033] In summary, the outstanding effects of the present invention are:

[0034] In the forming device of the serrated bolt of the present invention, the fifth main die cavity of the fifth die is of a two-stage structure. The first stage is located between the fifth punching die ejector pin and the second stage in the moving direction of the fifth punching die cushion block, and is a serrated tooth cavity section for forming the first rod body of the serrated bolt. The second stage is a stepped cavity section for forming the second rod body of the serrated bolt. The first self-guiding rod body connected to the second stage in the first stage is set to be tapered from the end away from the head flange towards the second stage, so that its inner wall forms an angle α of 15°-17° with the axis of the fifth main die cavity. Thus, when the preset blank with the head flange and the guiding rod body is inserted into the fifth main die during the pushing-in action of the fifth punching die, that is, during the process that the lower part of the first preset rod body is gradually formed into the first rod body and the second preset rod body is gradually formed into the second rod body, it compensates for the fullness of the serrated tooth forming under the guiding rod body caused by the mechanical interference and forming force of the press equipment. At the same time, due to the fluidity of the metal, the tooth bottom of the serrated teeth on the formed first rod body effectively extends to the connection part between the first rod body and the guiding rod body, ensuring the effective length of the serrated tooth forming and avoiding the appearance of overlapping marks at the connection part between the first rod body and the guiding rod body. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is the cold heading product drawing of the serrated bolt in the embodiment of the present invention;

[0037] Figure 2 It is the finished product drawing of the serrated bolt in the embodiment of the present invention;

[0038] Figure 3 It is the assembly drawing of the forming device of the serrated bolt in the embodiment of the present invention;

[0039] Figure 4 It is the partial structural schematic diagram of the fifth die in the embodiment of the present invention;

[0040] Figure 5 It is Figure 4 The enlarged view of A in

[0041] Explanation of the reference numerals in the drawings:

[0042] 1. Serrated bolt; 11. Head flange; 12. First rod body; 121. Serrations; 131. First stepped rod; 132. Second stepped rod; 133. Third stepped rod; 14. Guide rod body; 2. Preset blank; 3. First mold; 31. First main mold; 32. First punching die; 4. Second mold; 41. Second main mold; 42. Second punching die; 5. Third mold; 51. Third main mold; 52. Third punching die; 6. Fourth mold; 61. Fourth main mold; 62. Fourth punching die; 7. Fifth mold; 71. Fifth main mold; 711. Fifth main mold shell; 712. Fifth main mold ejector pin; 713. Fifth main mold core; 72. Fifth punching die; α. Angle formed by the first part of the first section of the fifth main mold cavity and the axis of the fifth main mold cavity. Detailed implementation manners

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] In the description of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "upper", "middle", "lower", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The following combines the attached Figure 1 To the attached Figure 5 And the embodiments are specifically described.

[0046] This embodiment provides a forming device for a serrated bolt. The serrated bolt 1 includes a head flange 11, a first rod body 12 and a second rod body. The first rod body 12 is a serrated rod, the second rod body is a stepped rod, and a guide rod body 14 is connected between the first rod body 12 and the head flange 11. The forming device includes:

[0047] A fifth mold 7, wherein the fifth mold 7 is used to mold the preset blank 2 formed with the head flange 11 and the guide rod body 14 into the first rod body 12 and the second rod body, wherein the fifth mold 7 comprises a fifth main mold 71 and a fifth punch 72 which are arranged correspondingly, wherein the fifth main mold 71 comprises a fifth main mold shell 711, a fifth main mold cushion block, a fifth main mold ejector pin 712 and a fifth main mold core 713 which are arranged in the fifth main mold shell 711, wherein the fifth main mold core 713 has a fifth main mold cavity with an opening toward the fifth punch 72, and the fifth main mold ejector pin 712 penetrates into the fifth main mold cavity from the bottom of the fifth main mold core 713;

[0048] The fifth punch die 72 includes a fifth punch die shell 711, a fifth punch die core arranged in the fifth punch die shell 711, a fifth punch die pad and a fifth punch die ejector pin 712, one end of the fifth punch die ejector pin 712 is connected to the fifth punch die pad, and the other end of the fifth punch die ejector pin 712 is opposite to the fifth main die cavity, and the fifth punch die pad moves in a direction toward the fifth main die 71 when the fifth main die 71 and the fifth punch die 72 are in a mold closing state, so that the fifth punch die ejector pin 712 delivers the preset blank 2 into the fifth main die cavity, and the fifth main die ejector pin 712 abuts against one end of the second preset rod of the preset blank 2 away from the head flange 11, and the head flange 11 of the preset blank 2 faces the fifth punch die 72;

[0049] Wherein, the fifth main mold cavity has a first section and a second section connected to the first section, the first section is located between the fifth die ejector pin 712 and the second section in the direction of movement of the fifth die pad, and the first section is a tooth 121 cavity section to form the first rod body 12, the second section is a step cavity section to form the second rod body, the first part connected to the first section gradually shrinks from the end of the guide rod body 14 away from the head flange 11 toward the second section, the inner wall of the first part forms an angle α with the axis of the fifth main mold cavity, and the angle α is 15°-17°.

[0050] With the above structure, in the forming device of this embodiment, the fifth die insert in the fifth punching die 72 of the fifth die 7 is used to protect the formed head flange 11. The fifth main die insert 713 of the fifth die 7 has a fifth main die cavity with an opening facing the fifth punching die 72. The fifth main die cavity has a two-stage structure. Its first stage is located between the fifth punching die ejector pin 712 and the second stage in the direction of movement of the fifth punching die spacer block, and is a serrated tooth 121 cavity section for forming the first rod 12 of the serrated tooth bolt 1. The second stage is a stepped cavity section for forming the second rod of the serrated tooth bolt 1. The first part of the first stage is tapered from the end of the guide rod body 14 away from the head flange 11 towards the second stage, so that its inner wall forms an angle α of 15° - 17° with the axis of the fifth main die cavity. Thus, when the preset blank 2 formed with the head flange 11 and the guide rod body 14 is inserted into the fifth main die 71 during the pushing-in action of the fifth punching die 72, that is, during the process that the lower part of the first preset rod is gradually formed into the first rod 12 and the second preset rod is gradually formed into the second rod, the forming fullness of the serrated tooth 121 under the guide rod body 14 caused by the mechanical interference of the press equipment and the forming force is compensated. At the same time, due to the fluidity of the metal, the end of the formed first rod 12 facing the head flange 11 forms an angle α of 15° - 17° with the axis of the first rod 12, and the bottom of the tooth of the serrated tooth 121 effectively extends to the connection between the first rod 12 and the guide rod body 14, ensuring the effective length of the formed serrated tooth 121 and avoiding the appearance of overlapping marks at the connection between the first rod 12 and the guide rod body 14. Thus, by using the forming device of the serrated tooth bolt 1 of this embodiment, it is ensured that the axial length of the formed serrated tooth 121 reaches the preset value and there is no overlapping mark during forming, thereby improving the product quality.

[0051] Please refer to Figures 3 to 5 , specifically, in this embodiment, the first part of the first stage is tapered from the end of the guide rod body 14 away from the head flange 11 towards the second stage, and its inner wall forms an angle α of 15° with the axis of the fifth main die cavity. The length of the guide rod body 14 is 0.5 mm. Thus, the lower section of the first preset rod of the preset blank 2 formed with the head flange 11 and the guide rod body 14 forms a serrated tooth 121 with sufficient fullness and length in the fifth die 7, and at the same time the second preset rod is formed into the second rod, that is, the serrated tooth bolt 1 is obtained. Of course, in other embodiments, the angle α formed by the inner wall of the first part of the first stage and the axis of the fifth main die cavity can also be set to other angles between 15° and 17° to cooperate with the length of the guide rod body 14 to form the serrated tooth 121 of the first rod 12.

[0052] Please refer to Figure 3, specifically, in this embodiment, the forming device further includes:

[0053] The first mold 3, which is used to shape a preset blank 2;

[0054] The second mold 4, which is used to form a first preset rod and a second preset rod on the shaped preset blank 2; the rod diameter of the first preset rod is greater than that of the second preset rod;

[0055] The third mold 5, which is used to form a preset flange on the upper section of the first preset rod away from the second preset rod;

[0056] The fourth mold 6, which is used to finish sizing the diameter of the preset flange and form the head flange 11 and the guide rod body 14 connected below the head flange 11.

[0057] Specifically, in this embodiment, the forming device further includes a shearing mechanism (not shown in the figure), and the shearing mechanism is used to cut the wire into the preset blank 2. The shearing mechanism is a pair of scissors or a shearing die.

[0058] Specifically, in this embodiment, the forming device further includes a feeding mechanism (not shown in the figure), such as a feeding clamp. The feeding clamp is used to feed between the first mold 3, the second mold 4, the third mold 5, the fourth mold 6 and the fifth mold 7.

[0059] Please continue to refer to Figure 3 , specifically, in this embodiment, the first mold 3 includes a correspondingly arranged first main mold 31 and a first punching die 32; the first main mold 31 includes a first main mold 31 shell, a first main mold 31 spacer block, a first main mold 31 ejector pin and a first main mold 31 core arranged inside the first main mold 31 shell. The first main mold 31 core has a first main mold 31 cavity with an opening facing the first punching die 32, and the first main mold 31 ejector pin penetrates into the first main mold 31 cavity from the bottom of the first main mold 31 core; the first punching die 32 includes a first punching die 32 shell, a first punching die 32 spacer block and a first punching die 32 ejector pin arranged inside the first punching die 32 shell. One end of the first punching die 32 ejector pin is connected to the first punching die 32 spacer block, and the other end of the first punching die 32 ejector pin penetrates out of the first punching die 32 shell and faces the first main mold 31 cavity. The first punching die 32 ejector pin is used to push the preset blank 2 into the first main mold 31 cavity of the first punching die 32 core, the first main mold 31 ejector pin is used to cooperate with the first punching die 32 ejector pin to cold upset and shape the preset blank, and the first main mold 31 ejector pin is also used to eject the preset blank out of the first main mold 31 cavity after the cold upset and shaping is completed.

[0060] Specifically, in this embodiment, the second die 4 includes a correspondingly arranged second main die 41 and a second punching die 42; the second main die 41 includes a second main die 41 shell, a second main die 41 spacer block, a second main die 41 ejector pin, and a second main die 41 core arranged inside the second main die 41 shell. The second main die 41 core has a second main die 41 cavity with an opening facing the second punching die 42. The second main die 41 ejector pin penetrates into the second main die 41 cavity from the bottom of the second main die 41 core; the second punching die 42 includes a second punching die 42 shell, a second punching die 42 spacer block, and a second punching die 42 ejector pin arranged inside the second punching die 42 shell. One end of the second punching die 42 ejector pin is connected to the second punching die 42 spacer block, and the other end of the second punching die 42 ejector pin penetrates out of the second punching die 42 shell and faces the second main die 41 cavity. The second main die 41 cavity is used to form the first preset rod and the second preset rod. The rod diameter of the first preset rod is larger than that of the second preset rod. The second main die 41 ejector pin is used to cooperate with the second punching die 42 ejector pin to cold upset the preset blank, and the second main die 41 ejector pin is also used to eject the preset blank from the second main die 41 cavity after cold upsetting. Among them, the first preset rod is used for the subsequent forming of the head flange 11 and the first rod body 12, and the second preset rod is used for the subsequent forming of the second rod body.

[0061] Specifically, in this embodiment, the third die 5 includes a correspondingly arranged third main die 51 and a third punching die 52; the third main die 51 includes a third main die 51 shell, a third main die 51 spacer block, a third main die 51 ejector pin, and a third main die 51 core arranged inside the third main die 51 shell. The third main die 51 core has a third main die 51 cavity with an opening facing the third punching die. The third main die 51 ejector pin penetrates into the third main die 51 cavity from the bottom of the third main die 51 core; the third punching die 52 includes a third punching die 52 shell, a third punching die 52 core, a third punching die 52 spacer block, and a third punching die 52 ejector pin arranged inside the third punching die 52 shell. One end of the third punching die 52 ejector pin is connected to the third punching die 52 spacer block, and the other end of the third punching die 52 ejector pin passes through the third punching die 52 shell and the third punching die 52 core and faces the third main die 51 cavity. The third punching die 52 core is used to form the upper section of the first preset rod away from the second preset rod into a preset flange. The third punching die 52 ejector pin and the third main die 51 ejector pin cooperate with each other to cold upset the preset blank 2. The third punching die 52 ejector pin is also used to eject the preset blank 2 out of the third punching die 52 core after cold upsetting, and the third main die 51 ejector pin is also used to eject the preset blank 2 out of the third main die 51 cavity after cold upsetting.

[0062] Specifically, in this embodiment, the fourth mold 6 includes a correspondingly arranged fourth main mold 61 and a fourth punching mold 62; the fourth main mold 61 includes a fourth main mold 61 shell, a fourth main mold 61 spacer block, a fourth main mold 61 ejector pin and a fourth main mold 61 core arranged inside the fourth main mold 61 shell. The fourth main mold 61 core has a fourth main mold 61 cavity with an opening facing the fourth punching mold. The fourth main mold 61 ejector pin penetrates into the fourth main mold 61 cavity from the bottom of the fourth main mold 61 core; the fourth punching mold 62 includes a fourth punching mold 62 shell, a fourth punching mold 62 core, a fourth punching mold 62 spacer block and a fourth punching mold 62 ejector pin arranged inside the fourth punching mold 62 shell. One end of the fourth punching mold 62 ejector pin is connected to the fourth punching mold 62 spacer block, and the other end of the fourth punching mold 62 ejector pin passes through the fourth punching mold 62 shell and the fourth punching mold 62 core and faces the fourth main mold 61 cavity. The fourth punching mold 62 core is used for further shaping the preset flange so that the preset flange is formed into the head flange 11 and the guide rod body 14 connected below the head flange 11 is formed.

[0063] Please refer to Figures 1 to 5 , specifically, the serrated bolt 1 provided in this embodiment includes a head flange 11, a first rod body 12 and a second rod body. The first rod body 12 is a serrated rod, and the second rod body is a stepped rod. A guide rod body 14 with a length of 0.5 mm is connected between the first rod body 12 and the head flange 11; the second rod body includes a first stepped rod 131, a second stepped rod 132 and a third stepped rod 133. The first stepped rod 131, the second stepped rod 132 and the third stepped rod 133 are sequentially connected from one end of the head flange 11, and their rod diameters decrease sequentially; the first stepped rod 131 is formed with a first thread by a thread rolling process, the second stepped rod 132 is formed with a second thread by a thread rolling process, and the spacing between the first thread and the second thread is small.

[0064] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any changes, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A forming device for a serrated bolt, the serrated bolt comprising a head flange, a first rod body and a second rod body, the first rod body being a serrated rod, the second rod body being a stepped rod, and a guiding rod body being connected between the first rod body and the head flange, characterized in that, The forming device comprises: a first mold for shaping a preset blank; a second mold for forming a first preset rod and a second preset rod on the shaped preset blank; the rod diameter of the first preset rod is larger than that of the second preset rod; a third mold for forming a preset flange on the upper section of the first preset rod away from the second preset rod; a fourth mold for finishing the diameter of the preset flange to form the head flange and a guide rod body connected below the head flange; a fifth mold for forming a first rod body and a second rod body on the preset blank formed with the head flange and the guide rod body. The fifth mold comprises a correspondingly arranged fifth main mold and a fifth punching mold. The fifth main mold comprises a fifth main mold shell, a fifth main mold cushion block, a fifth main mold ejector pin and a fifth main mold core arranged in the fifth main mold shell. The fifth main mold core has a fifth main mold cavity with an opening facing the fifth punching mold. The fifth main mold ejector pin penetrates into the fifth main mold cavity from the bottom of the fifth main mold core; the fifth punching mold comprises a fifth punching mold shell, a fifth punching mold core, a fifth punching mold cushion block and a fifth punching mold ejector pin arranged in the fifth punching mold shell. One end of the fifth punching mold ejector pin is connected with the fifth punching mold cushion block, and the other end of the fifth punching mold ejector pin faces the fifth main mold cavity. When the fifth main mold and the fifth punching mold are in a closed mold state, the fifth punching mold cushion block moves in the direction towards the fifth main mold, so that the fifth punching mold ejector pin feeds the preset blank into the fifth main mold cavity. The fifth main mold ejector pin abuts against one end of the second preset rod of the preset blank away from the head flange, and the head flange of the preset blank faces the fifth punching mold; wherein, the fifth main mold cavity has a first section and a second section connected to the first section. The first section is located between the fifth punching mold ejector pin and the second section in the moving direction of the fifth punching mold cushion block, and the first section is a flower tooth cavity section for forming the first rod body. The second section is a stepped cavity section for forming the second rod body. The first part where the first section is connected to the second section tapers from the end of the guide rod body away from the head flange towards the second section. The inner wall of the first part forms an included angle α with the axis of the fifth main mold cavity, and the included angle α is 15°-17°; a shearing mechanism for cutting the wire into the preset blank.

2. The forming device of the serrated bolt according to claim 1, characterized in that, The shearing mechanism is scissors or a shearing die.

3. The forming device of the serrated bolt according to claim 1, characterized in that, The forming device further comprises a feeding mechanism for feeding between the first mold, the second mold, the third mold, the fourth mold and the fifth mold.

4. The forming device of the serrated bolt according to claim 1, characterized in that, The first mold comprises a correspondingly arranged first main mold and a first punching mold; the first main mold comprises a first main mold shell, a first main mold cushion block, a first main mold ejector pin and a first main mold core arranged in the first main mold shell. The first main mold core has a first main mold cavity with an opening facing the first punching mold. The first main mold ejector pin penetrates into the first main mold cavity from the bottom of the first main mold core; The first punching die includes a first punching die shell, a first punching die cushion block and a first punching die ejector pin disposed within the first punching die shell. One end of the first punching die ejector pin is connected to the first punching die cushion block, and the other end of the first punching die ejector pin penetrates through the first punching die shell and faces the first main die cavity.

5. The forming device of the serrated bolt according to claim 1, characterized in that, The second die includes a correspondingly arranged second main die and second punching die; The second main die includes a second main die shell, a second main die cushion block, a second main die ejector pin and a second main die core disposed within the second main die shell. The second main die core has a second main die cavity with an opening facing the second punching die, and the second main die ejector pin penetrates into the second main die cavity from the bottom of the second main die core; The second punching die includes a second punching die shell, a second punching die cushion block and a second punching die ejector pin disposed within the second punching die shell. One end of the second punching die ejector pin is connected to the second punching die cushion block, and the other end of the second punching die ejector pin penetrates through the second punching die shell and faces the second main die cavity.

6. The forming device of the serrated bolt according to claim 1, characterized in that, The third die includes a correspondingly arranged third main die and third punching die; The third main die includes a third main die shell, a third main die cushion block, a third main die ejector pin and a third main die core disposed within the third main die shell. The third main die core has a third main die cavity with an opening facing the third punching die, and the third main die ejector pin penetrates into the third main die cavity from the bottom of the third main die core; The third punching die includes a third punching die shell, a third punching die core, a third punching die cushion block and a third punching die ejector pin disposed within the third punching die shell. One end of the third punching die ejector pin is connected to the third punching die cushion block, and the other end of the third punching die ejector pin penetrates through the third punching die shell and the third punching die core and faces the third main die cavity.

7. The forming device of the serrated bolt according to claim 1, characterized in that, The fourth die includes a correspondingly arranged fourth main die and fourth punching die; The fourth main die includes a fourth main die shell, a fourth main die cushion block, a fourth main die ejector pin and a fourth main die core disposed within the fourth main die shell. The fourth main die core has a fourth main die cavity with an opening facing the fourth punching die, and the fourth main die ejector pin penetrates into the fourth main die cavity from the bottom of the fourth main die core; The fourth punching die includes a fourth punching die shell, a fourth punching die core, a fourth punching die cushion block and a fourth punching die ejector pin disposed within the fourth punching die shell. One end of the fourth punching die ejector pin is connected to the fourth punching die cushion block, and the other end of the fourth punching die ejector pin penetrates through the fourth punching die shell and the fourth punching die core and faces the fourth main die cavity.

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