Anti-tilt bolt and preparation method thereof
By designing anti-tilt bolts, the problem of bolts tilting during assembly is solved by using the triangular prism or cylindrical structure and concentric settings at the guide end, and the problem of bolts tilting during assembly is achieved, achieving more efficient assembly and lower maintenance costs.
Patent Information
- Application Number
- CN202411668880.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-02-28
AI Technical Summary
During the assembly process of the car, the bolts are easily tilted, causing them to be biased when installing fasteners, damage accessories or scratch the body, increasing maintenance costs.
An anti-tilt bolt is designed, which includes a bolt head, a bolt rod and a guide end. The guide end is a triangular structure or a cylindrical structure. It is prepared by cold heading mold and heat treatment process to ensure that the guide end is arranged concentrically with the bolt rod and can quickly adjust the inclination angle.
Effectively prevent bolts from tilting, improve assembly efficiency, reduce maintenance costs, and improve material utilization and production efficiency.
Smart Images
Figure CN119532302A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of bolts, in particular to an anti-tilt bolt and a preparation method thereof. Background Art
[0002] The assembly of automobiles requires various bolts. When installing bolts, some installation positions are open, some are hidden or not very friendly to ergonomics. When installing fasteners, it is easy to hit them off-center, damage accessories, and sometimes even scratch the car body, resulting in high repair costs. Bolts that can prevent the bolts from tilting during installation and are easy to use are needed. Summary of the invention
[0003] In order to solve the problems raised in the above-mentioned background technology, the purpose of the present invention is to provide an anti-tilt bolt and a preparation method thereof, comprising a bolt head, a bolt shank and a guide end, wherein the bolt head is connected to the bolt shank, the bolt shank is a cylinder with external threads, the bolt shank is connected to the guide end, and the guide end is provided with external threads.
[0004] The guide end is a triangular prism structure, and its section is a circular arc convex triangle with three arc-shaped sides and equal arc lengths.
[0005] The guide end is a cylindrical structure, and its cross section is circular.
[0006] The guide end and the bolt rod are concentrically arranged.
[0007] The longest distance from the center of the guide end section to the arc is less than or equal to the section radius of the bolt shank.
[0008] A method for preparing an anti-tilt bolt is as follows: S1: Cutting: Cut the material into the required bolt blank size; S2: Cold heading: The bolt blank is cold headed by a cold heading die; S3: Heat treatment: The semi-finished bolts after cold heading are sent to the dephosphorization machine for dephosphorization, the dephosphorized bolts are sent to the quenching furnace for quenching, and the quenched bolts are sent to the tempering furnace for tempering; S3: Thread rolling: Thread the heat-treated semi-finished bolt into external threads; S4: Surface treatment: Surface treatment is performed on the semi-finished bolt after thread rolling to obtain the finished bolt; S5: Functional test: Put the finished bolts into the bolt anti-tilt function test device to test the bolts that meet the functional requirements; The cold heading die in step S2 comprises a first-station cold heading die, a second-station cold heading die, a third-station cold heading die and a fourth-station cold heading die; the first-station cold heading die comprises a first upper die and a first lower die, the first upper die comprises a first upper die shell, a first upper die rear pad, a first upper die spring, a first upper die pre-filling die sleeve and a first upper die core, the first upper die shell is provided with a first upper die pre-filling die sleeve at the lower end, the first upper die pre-filling die sleeve is provided with a first upper die core, the upper end of the first upper die pre-filling die sleeve abuts against the lower end of the first upper die rear pad, and the first upper die rear pad is provided with a first upper die spring; the first lower die comprises a first lower die shell, a first lower die alloy, a first lower die rear pad and a first lower die core, the first lower die shell is provided with a first lower die core at the center, the first lower die core is sleeved with a first lower die alloy at the upper end, and the first lower die rear pad is sleeved with a first lower die core at the lower end; The second station cold heading die comprises a second upper die and a second lower die, wherein the second upper die comprises a second upper die shell and a second upper die alloy, and the lower end of the second upper die shell is provided with a second upper die alloy; the second lower die comprises a second lower die sheet, a second lower die alloy, a second lower die shell, a second lower die back pad, and a second lower die core, the upper end of the second lower die shell is provided with a second lower die sheet, the center of the second lower die shell is provided with a second lower die core, the upper end of the second lower die core is provided with a second lower die alloy, and the lower end of the second lower die core is sleeved with a second lower die back pad; The three-station cold heading die comprises a third upper die and a third lower die, the third upper die comprises a third upper die rear pad, a third upper die shell, a third upper die punch, and a third upper die alloy, a third upper die punch is provided at the center of the third upper die shell, the third upper die punch upper end is sleeved with the third upper die rear pad, and the third upper die punch lower end is sleeved with the third upper die alloy, the third lower die comprises a third lower die alloy, a third lower die shell, a third lower die rear pad, and a third lower die core, a third lower die core is provided at the center of the third lower die shell, the third lower die core upper end is provided with the third lower die alloy, and the third lower die core lower end is sleeved with the third lower die rear pad; The fourth station cold heading die comprises a fourth upper die and a fourth lower die, the fourth upper die comprises a fourth upper die back pad, a fourth upper die shell, a fourth upper die punch, and a fourth upper die alloy, a fourth upper die punch is provided at the center of the fourth upper die shell, the upper end of the fourth upper die punch is sleeved with a fourth upper die back pad, and the lower end of the fourth upper die punch is sleeved with a fourth upper die alloy, the fourth lower die comprises a fourth lower die alloy, a fourth lower die shell, a fourth lower die back pad, and a fourth lower die core; a fourth lower die core is provided at the center of the fourth lower die shell, the upper end of the fourth lower die core is provided with a fourth lower die alloy, and the lower end of the fourth lower die core is sleeved with a fourth lower die back pad.
[0009] The bolt anti-tilt function test device in step S5 includes a bracket and a base; the bracket is provided with a transverse portion and a vertical portion, a fixing bolt is provided at the top of the vertical portion, the fixing bolt fixes the transverse portion, a tightening device is provided at the upper end of the transverse portion, a base is provided on one side of the bracket, a nut fixing bracket is provided at the upper end of the base, a mounting groove is provided at the center of the nut fixing bracket, one side of the nut fixing bracket is provided with an elastic device fixing bolt one, the other side of the elastic device fixing bolt one is provided with one end of the elastic device, the other end of the elastic device is connected to the elastic device fixing bolt two, and the other end of the elastic device fixing bolt two is fixed in the base. A positioning pin is provided on the other side of the nut fixing bracket, and the nut fixing bracket is rotatably connected to the base through the positioning pin. The nut fixing bracket is tilted to produce an inclination angle of 5-10 degrees with the base.
[0010] Compared with the prior art, the present invention can quickly adjust the inclination angle back to the correct angle when the bolt is tilted and screwed into the internal thread, effectively preventing the bolt from tilting and subsequent problems, and is more convenient to use. The preparation method thereof improves the utilization rate of materials, selects qualified products for production, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic diagram of the structure of the present invention.
[0012] Figure 2 It is an oblique side view of the first embodiment of the present invention.
[0013] Figure 3 It is an oblique side view of the second embodiment of the present invention.
[0014] Figure 4 This is a schematic diagram of the cold heading die structure of the first station.
[0015] Figure 5 This is a schematic diagram of the cold heading die structure of the second station.
[0016] Figure 6 This is a schematic diagram of the cold heading die structure of the third station.
[0017] Figure 7 This is a schematic diagram of the cold heading die structure of the fourth station.
[0018] Figure 8 This is the front view of the semi-finished product structure of the first station cold heading die.
[0019] Fig. 9 This is the front view of the semi-finished product structure of the second station cold heading die.
[0020] Fig.10 This is the front view of the semi-finished product structure of the third station cold heading die.
[0021] Fig.11 This is a top view of the semi-finished product structure of the third station cold heading die.
[0022] Fig.12 This is the front view of the semi-finished product structure of the fourth station cold heading die.
[0023] Fig.13 This is a top view of the semi-finished product structure of the fourth station cold heading die.
[0024] Fig.14 This is a schematic diagram of the structure of the bolt anti-tilt function test device. DETAILED DESCRIPTION
[0025] The present invention will be further described below with reference to the accompanying drawings. Embodiment 1
[0026] like Figure 1 to Figure 2 As shown, the bolt head 1 is connected to the bolt shank 2, and the bolt shank 2 is a cylinder with external threads. The bolt shank 2 is connected to the guide end 3, and the guide end 3 is provided with external threads 4. The thread is provided to facilitate the installation of the bolt. The guide end 3 is a triangular prism structure, and its cross section is a circular arc convex triangle with three arcs and equal arc lengths. The guide end 3 and the bolt shank 2 are concentrically arranged. The longest distance from the center of the cross section of the guide end 3 to the arc is less than or equal to the cross section radius of the bolt shank.
[0027] When in use, the anti-tilt bolt is screwed into the accessory. If a tilt angle occurs, the guide end 3 assists in adjusting the angle so that the anti-tilt bolt returns to the correct angle and does not get stuck with the internal threaded hole, thereby improving assembly efficiency.
[0028] The specific method of the preparation method of this embodiment is as follows: S1: Cutting: Cut the material into the required bolt blank size; S2: Cold heading: The bolt blank is cold headed by a cold heading die; S3: Heat treatment: The semi-finished bolts after cold heading are sent to the dephosphorization machine for dephosphorization, the dephosphorized bolts are sent to the quenching furnace for quenching, and the quenched bolts are sent to the tempering furnace for tempering; S3: Thread rolling: Thread the heat-treated semi-finished bolt into external threads; S4: Surface treatment: Surface treatment is performed on the semi-finished bolt after thread rolling to obtain the finished bolt; S5: Functional test: Place the finished bolts into the bolt anti-tilt functional test device to test the bolts that meet the functional requirements.
[0029] like Figures 4 to 13As shown, the cold heading die in step S2 of this embodiment includes a first-station cold heading die, a second-station cold heading die, a third-station cold heading die, and a fourth-station cold heading die; the cold heading die in step S2 includes a first-station cold heading die, a second-station cold heading die, a third-station cold heading die, and a fourth-station cold heading die; the first-station cold heading die includes a first upper die and a first lower die, the first upper die includes a first upper die shell 1-3, a first upper die rear pad 1-1, a first upper die spring 1-2, a first upper die pre-filling die sleeve 1-4, a first upper die core 1-5, and the first upper die shell 1-3 is provided with a first An upper mold pre-filling mold sleeve 1-4, wherein the first upper mold pre-filling mold sleeve 1-4 is provided with a first upper mold core 1-5, the upper end of the first upper mold pre-filling mold sleeve 1-4 abuts against the lower end of the first upper mold rear pad 1-1, and the first upper mold rear pad 1-1 is provided with a first upper mold spring 1-2; the first lower mold comprises a first lower mold shell 1-7, a first lower mold alloy 1-6, a first lower mold rear pad 1-8, and a first lower mold core 1-9, wherein the first lower mold shell 1-7 is provided with a first lower mold core 1-9 at the center, the first lower mold alloy 1-6 is sleeved on the upper end of the first lower mold core 1-9, and the first lower mold rear pad 1-8 is sleeved on the lower end of the first lower mold core 1-9; The second-station cold heading die comprises a second upper die and a second lower die, wherein the second upper die comprises a second upper die shell 2-1 and a second upper die alloy 2-2, wherein the lower end of the second upper die shell 2-1 is provided with a second upper die alloy 2-2; the second lower die comprises a second lower die sheet 2-3, a second lower die alloy 2-4, a second lower die shell 2-5, a second lower die back pad 2-6, and a second lower die core 2-7, wherein the upper end of the second lower die shell 2-5 is provided with a second lower die sheet 2-3, the center of the second lower die shell 2-5 is provided with a second lower die core 2-7, the upper end of the second lower die core 2-7 is provided with a second lower die alloy 2-4, and the lower end of the second lower die core 2-7 is sleeved with a second lower die back pad 2-6; The three-station cold heading die comprises a third upper die and a third lower die, the third upper die comprises a third upper die rear pad 3-1, a third upper die shell 3-2, a third upper die punch 3-3, and a third upper die alloy 3-4, the third upper die shell 3-2 is provided with a third upper die punch 3-3 in the center, the third upper die punch 3-3 is sleeved with the third upper die rear pad 3-1 at the upper end, and the third upper die punch is sleeved with the third upper die alloy 3-4 at the lower end, the third lower die comprises a third lower die alloy 3-5, a third lower die shell 3-6, a third lower die rear pad 3-7, and a third lower die core 3-8, the third lower die shell 3-6 is provided with a third lower die core 3-8 in the center, the third lower die core 3-8 is sleeved with the third lower die alloy 3-5 at the upper end, and the third lower die core 3-8 is sleeved with the third lower die rear pad 3-7 at the lower end; The fourth station cold heading die comprises a fourth upper die and a fourth lower die, the fourth upper die comprises a fourth upper die back pad 4-1, a fourth upper die shell 4-2, a fourth upper die punch 4-3, and a fourth upper die alloy 4-4, a fourth upper die punch 4-3 is arranged at the center of the fourth upper die shell 4-2, the fourth upper die punch 4-3 is sleeved at the upper end of the fourth upper die punch 4-3 with the fourth upper die back pad 4-1, and the fourth upper die punch 4-3 is sleeved at the lower end of the fourth upper die alloy 4-4, the fourth lower die comprises a fourth lower die alloy 4-5, a fourth lower die shell 4-6, a fourth lower die back pad 4-7, and a fourth lower die core 4-8; a fourth lower die core 4-8 is arranged at the center of the fourth lower die shell 4-6, the fourth lower die core 4-8 is sleeved at the upper end of the fourth lower die alloy 4-5, and the fourth lower die core 4-8 is sleeved at the lower end of the fourth lower die back pad 4-7.
[0030] When the cold heading die of this embodiment is used, the raw material is placed in the first station cold heading die, such as Figure 6 The shaping shown in the figure makes the material initially form the workpiece contour, and then put it into the second station cold heading die, such as Figure 7 As shown in the figure, it is further shaped and then placed in the third station cold heading die, as shown in the figure. Figures 8 to 9 As shown in the figure, the upper end of the workpiece is further refined and finally placed in the fourth station cold heading die for cold heading. Figure 10 to Figure 11 As shown, the workpiece is formed and the bolts are initially produced.
[0031] like Fig.14 As shown, in the bolt anti-tilt function test device in step S5 of this embodiment, the bracket 9 is provided with a horizontal part and a vertical part, and a tightening device 7 is provided at the upper end of the horizontal part, and the tightening device 7 adopts a tightening shaft. A base 11 is provided on one side of the bracket 9, and a nut fixing bracket 12 is provided on the upper end of the base 11. One side of the nut fixing bracket 12 is provided with a side of an elastic device fixing bolt 13, and the other side of the elastic device fixing bolt 13 is provided with one end of an elastic device 15, and the other end of the elastic device 15 is connected to the elastic device fixing bolt 2 14, and the elastic device 15 uses an elastic rubber band. The other end of the elastic device fixing bolt 2 14 is fixed in the base 11. A fixing bolt 10 is provided at the top of the vertical part of the bracket 9, and the fixing bolt 10 fixes the horizontal part. A positioning pin 5 is provided on the other side of the nut fixing bracket 12, and the nut fixing bracket 12 is rotatably connected to the base 11 through the positioning pin 5. The nut fixing bracket 9 is tilted to produce an inclination angle of 5-10 degrees with the base, and a mounting groove is provided in the center of the nut fixing bracket 12. When the anti-tilt bolt 8 is placed into the tightening shaft vertically on the base 11, it will tilt in the vertical direction with the test nut 6 placed in the mounting groove of the nut fixing bracket 12, thereby simulating the situation where the bolt is screwed into the internal threaded part at an angle.
[0032] When the bolt anti-tilt function test device of this embodiment is used, the tightening device 7 is rotated. Under the action of the tightening torque, the anti-tilt bolt 8 will gradually be screwed into the test nut 6. Under the action of the threaded fit, the test nut 6 will gradually become perpendicular to the anti-tilt bolt 8, and the test nut fixing bracket 12 will be lifted. Due to the existence of the elastic device 15, the test nut fixing bracket 12 will be subjected to tension in this process, and a rotational torque in the correction direction will be generated for the anti-tilt bolt 8 - the correction torque M, wherein M=elastic force F×lever arm L.
[0033] For the anti-tilt bolt 8, the test nut fixing bracket 12 can be lifted normally under the correction action, and the bolt and nut threads will not be damaged. For parts that do not meet the anti-tilt function, the bolt will get stuck in the test nut 17 or slip, and the test nut 17 cannot be corrected, and it will fail the test of this device. Embodiment 2
[0034] This embodiment only describes the differences from the first embodiment, and the similarities are not repeated.
[0035] like Figure 3 As shown, the difference between this embodiment and the first embodiment is that the guide end 3 is a cylindrical structure, and its cross section is circular.
Claims
1. An anti-tilt bolt, comprising a bolt head (1), a bolt shank (2), and a guide end (3), characterized in that: The bolt head (1) is connected to a bolt shank (2), the bolt shank (2) is a cylinder with external threads, the bolt shank (2) is connected to a guide end (3), and the guide end (3) is provided with external threads (4).
2. The anti-tilt bolt according to claim 1, characterized in that: The guide end (3) is a triangular prism structure, and its cross section is a circular arc convex triangle with three arc-shaped sides and equal arc lengths.
3. The anti-tilt bolt according to claim 1, characterized in that: The guide end (3) is a cylindrical structure, and its cross section is circular.
4. The anti-tilt bolt according to claim 1, characterized in that: The guide end (3) and the bolt shank (2) are concentrically arranged.
5. An anti-tilt bolt according to claim 2 or 3, characterized in that: The longest distance from the center of the section of the guide end (3) to the arc is less than or equal to the radius of the section of the bolt shank.
6. A method for preparing an anti-tilt bolt according to any one of claims 1, 2, 4 and 5, characterized in that: The specific method is as follows: S1: Cutting: Cut the material into the required bolt blank size; S2: Cold heading: The bolt blank is cold headed by a cold heading die; S3: Heat treatment: The semi-finished bolts after cold heading are sent to the dephosphorization machine for dephosphorization, the dephosphorized bolts are sent to the quenching furnace for quenching, and the quenched bolts are sent to the tempering furnace for tempering; S3: Thread rolling: Thread the heat-treated semi-finished bolt into external threads; S4: Surface treatment: Surface treatment is performed on the semi-finished bolt after thread rolling to obtain the finished bolt; S5: Functional test: Place the finished bolts into the bolt anti-tilt functional test device to test the bolts that meet the functional requirements.
7. The method for preparing an anti-tilt bolt according to claim 6, characterized in that: The cold heading die in step S2 comprises a first-station cold heading die, a second-station cold heading die, a third-station cold heading die, and a fourth-station cold heading die; the first-station cold heading die comprises a first upper die and a first lower die; the first upper die comprises a first upper die shell (1-3), a first upper die rear pad (1-1), a first upper die spring (1-2), a first upper die pre-filling die sleeve (1-4), and a first upper die core (1-5); a first upper die shell (1-3) is provided with a first upper die pre-filling die sleeve (1-4) at the lower end; a first upper die pre-filling die sleeve (1-4) is provided with a first upper die core (1-5); an upper end of the first upper die pre-filling die sleeve (1-4) abuts against a lower end of the first upper die rear pad (1-1); and a first upper die rear pad (1-2) is provided. 1-1) is provided with a first upper die spring (1-2); the first lower die comprises a first lower die shell (1-7), a first lower die alloy (1-6), a first lower die back pad (1-8), and a first lower die core (1-9); a first lower die core (1-9) is provided at the center of the first lower die shell (1-7); the first lower die alloy (1-6) is sleeved on the upper end of the first lower die core (1-9); and the first lower die back pad (1-8) is sleeved on the lower end of the first lower die core (1-9); the second station cold heading die comprises a second upper die and a second lower die; the second upper die comprises a second upper die shell (2-1) and a second upper die alloy (2-2); the second upper die alloy (2-2) is provided in the lower end of the second upper die shell (2-1) The second lower die comprises a second lower die sheet (2-3), a second lower die alloy (2-4), a second lower die shell (2-5), a second lower die back pad (2-6), and a second lower die core (2-7); the second lower die sheet (2-3) is arranged inside the upper end of the second lower die shell (2-5); the second lower die core (2-7) is arranged at the center of the second lower die shell (2-5); the second lower die alloy (2-4) is arranged at the upper end of the second lower die core (2-7); the second lower die back pad (2-6) is sleeved on the lower end of the second lower die core (2-7); the three-station cold heading die comprises a third upper die and a third lower die; the third upper die comprises a third upper die back pad (3-1), a third upper die shell (3-2), and a third upper die punch rod (3-3), a third upper die alloy (3-4), a third upper die punch rod (3-3) is provided at the center of the third upper die shell (3-2), the upper end of the third upper die punch rod (3-3) is sleeved with a third upper die rear pad (3-1), and the lower end of the third upper die punch rod is sleeved with a third upper die alloy (3-4), the third lower die comprises a third lower die alloy (3-5), a third lower die shell (3-6), a third lower die rear pad (3-7), and a third lower die core (3-8), a third lower die shell (3-6) is provided at the center of the third lower die core (3-8), the upper end of the third lower die core (3-8) is sleeved with the third lower die alloy (3-5), and the lower end of the third lower die core (3-8) is sleeved with the third lower die rear pad (3-7);The fourth station cold heading die comprises a fourth upper die and a fourth lower die, the fourth upper die comprises a fourth upper die rear pad (4-1), a fourth upper die shell (4-2), a fourth upper die punch (4-3), and a fourth upper die alloy (4-4), a fourth upper die punch (4-3) is arranged at the center of the fourth upper die shell (4-2), the fourth upper die punch (4-3) is sleeved at the upper end of the fourth upper die punch (4-3), and the fourth upper die rear pad (4-1) is sleeved at the lower end of the fourth upper die punch (4-3). The upper mold alloy (4-4), the fourth lower mold comprising a fourth lower mold alloy (4-5), a fourth lower mold shell (4-6), a fourth lower mold back pad (4-7), and a fourth lower mold core (4-8); a fourth lower mold core (4-8) is provided at the center of the fourth lower mold shell (4-6), the fourth lower mold alloy (4-5) is sleeved on the upper end of the fourth lower mold core (4-8), and the fourth lower mold back pad (4-7) is sleeved on the lower end of the fourth lower mold core (4-8). ; 8. The method for preparing an anti-tilt bolt according to claim 6, characterized in that: The bolt anti-tilt function test device in step S5 comprises a bracket (9) and a base (11), characterized in that: the bracket (9) is provided with a transverse portion and a vertical portion, a fixing bolt (10) is provided at the top of the vertical portion, the fixing bolt (10) fixes the transverse portion, a tightening device (7) is provided at the upper end of the transverse portion, a base (11) is provided at one side of the bracket (9), a nut fixing bracket (12) is provided at the upper end of the base (11), a mounting groove is provided at the center of the nut fixing bracket (12), a side of an elastic device fixing bolt (13) is provided at one side of the nut fixing bracket (12), and one end of an elastic device (15) is provided at the other side of the elastic device fixing bolt (13), the other end of the elastic device (15) is connected to the elastic device fixing bolt (14), and the other end of the elastic device fixing bolt (14) is fixed in the base (11). A positioning pin (5) is provided at the other side of the nut fixing bracket (12), and the nut fixing bracket (12) is rotatably connected to the base (11) through the positioning pin (5). The nut fixing bracket (12) is tilted to form an inclination angle of 5-10 degrees with the base (11).