Preparation method of inclined groove bolt and bolt

Abstract

The invention discloses a preparation method of an inclined groove bolt and the bolt. The method comprises the following steps of S10, material shearing, wherein a metal material with the proper diameter is cut into metal rods with the proper length; s20, first cold heading forming is conducted, specifically, a circular truncated cone part is formed at one end of the metal rod through a cold heading technology; s30, second cold heading forming is conducted, specifically, a bolt cap is formed at the other end of the metal rod through the cold heading technology; s40, third cold heading forming is conducted, specifically, the bolt cap is shaped through the cold heading technology; s50, fourth cold heading forming, wherein anti-loose protruding strips are formed on the inner surface of the bolt cap through the cold heading technology, and inclined grooves are formed in the circular truncated cone part; and S60, thread rolling is conducted, specifically, threads are rolled out on a thread rolling plate, and an anti-loosening thread forming area is arranged on the thread rolling plate and used for rolling out anti-loosening threads. By means of the manufacturing method, the bolt can be efficiently produced, the bolt is provided with the oblique groove and the notch thread, foreign matter such as residues and paint in a nut hole can be effectively removed in the screwing-in process, the power connection effect is guaranteed, and the anti-loosening effect is good after screwing-in.

Description

Technical Field

[0001] This invention belongs to the field of bolt manufacturing technology, specifically relating to a method for preparing a diagonally grooved bolt and the bolt itself. Background Technology

[0002] Bolts are a widely used type of fastener. A typical bolt has a bolt head and a bolt shank, with threads on the shank for fitting into a matching nut hole. In existing technology, some nut holes have a paint layer, which needs to be effectively removed during bolt assembly to achieve better bonding. Furthermore, any residue in the nut hole also needs to be effectively removed to ensure a better assembly result.

[0003] Traditional bolt manufacturing methods are simple, but difficult to complete the production process of bolts with special structures. Therefore, based on the above requirements, this application designs a method for manufacturing oblique groove bolts and a bolt. Summary of the Invention

[0004] To address the shortcomings of the existing technology, this invention provides a high-strength, tough, and weather-resistant fastener, specifically a method for preparing a slanted groove bolt and the bolt itself. This method enables efficient bolt production, and the bolt has slanted grooves and notched threads. During the screwing process, it can effectively remove residues, paint, and other foreign matter from the nut hole, ensuring a good electrical connection, and it also provides good anti-loosening properties after screwing in.

[0005] The present invention is solved by the following technical solution.

[0006] A method for preparing a grooved bolt includes the following steps: S10: Shearing: Cutting a metal material of suitable diameter into a metal rod of suitable length; S20: Cold heading forming one: Forming a frustum at one end of the metal rod by cold heading process; S30: Cold heading forming two: Forming a bolt head at the other end of the metal rod by cold heading process; S40: Cold heading forming three: Shaping the bolt head by cold heading process; S50: Cold heading forming four: Forming an anti-loosening ridge on the inner surface of the bolt head by cold heading process, and forming a grooved oblique groove on the frustum; S60: Thread rolling: Rolling threads on a thread rolling plate, wherein the thread rolling plate is provided with an anti-loosening thread forming area for rolling anti-loosening threads.

[0007] The preparation method in this application adopts cold heading and wire rolling processes, and the overall preparation method is simple.

[0008] In a preferred embodiment, in step S50, a cold heading operation is performed using a dedicated cold heading mold. The cold heading mold has a through hole for inserting a metal rod. One side surface of the cold heading mold has a plurality of grooves distributed along the opening of the through hole. These grooves are used for cold heading to form anti-loosening protrusions.

[0009] In a preferred embodiment, a protrusion is provided on the inner wall of the through hole on the other side surface of the cold heading mold, the protrusion being used to cold heading out an oblique groove.

[0010] In a preferred embodiment, the thread rolling plate is provided with a conventional thread forming area and an anti-loosening thread forming area. The anti-loosening thread forming area has several symmetrically arranged protrusions on both sides of the thread forming ridge, which are used to roll out anti-loosening threads during the thread rolling process.

[0011] This application also relates to a bolt prepared by the above method. Specifically, the bolt includes a bolt shank and a bolt head. The bolt shank has threads, including narrow anti-loosening threads. Several anti-loosening thread segments are aligned and arranged in the axial direction of the bolt shank to form anti-loosening thread segments. The bolt shank has three or four anti-loosening thread segments. In this structure, during the bolt tightening process, the anti-loosening threads can effectively remove paint from the surface of the nut, resulting in better grounding performance.

[0012] In a preferred embodiment, the outer end of the bolt rod is provided with a frustum portion, and the frustum portion is provided with a plurality of axially distributed oblique grooves. During the bolt screwing process, the oblique grooves can effectively remove foreign matter such as residue and paint from the nut hole.

[0013] In a preferred embodiment, the inner side of the bolt cap is provided with several anti-loosening protrusions, which can be effectively pressed into the contact surface after tightening, thereby preventing loosening.

[0014] Compared with the prior art, the present invention has the following beneficial effects: it provides a method for preparing a grooved bolt and a bolt, which can efficiently produce bolts and improve bolt consistency through mold control. The bolt has grooves and notched threads, which can effectively remove foreign matter such as residue and paint from the nut hole during the screwing process, ensuring the connection effect, and providing good anti-loosening effect after screwing. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of various states of bolt processing in the preparation method of the present invention.

[0016] Figure 2 The three-dimensional representation of the bolt in state e in this invention. Figure 1 .

[0017] Figure 3 The three-dimensional representation of the bolt in state e in this invention. Figure 2 .

[0018] Figure 4 The three-dimensional cold heading die in step S50 of this invention Figure 1 .

[0019] Figure 5 The three-dimensional cold heading die in step S50 of this invention Figure 2 .

[0020] Figure 6 This is a cross-sectional view of the cold heading die in step S50 of the present invention.

[0021] Figure 7 This is a perspective view of the thread rolling plate in this invention.

[0022] Figure 8 This is a front view of the wire rolling plate in this invention.

[0023] Figure 9 This is a partially enlarged schematic diagram of the anti-loosening thread forming area on the thread rolling plate of the present invention.

[0024] Figure 10 The three-dimensional representation of the bolt in this invention Figure 1 .

[0025] Figure 11 The three-dimensional representation of the bolt in this invention Figure 2 .

[0026] Figure 12 This is a cross-sectional view and a partial enlarged view of the bolt in this invention. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] In the following embodiments, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of this invention, it should be understood that terms such as center, longitudinal, transverse, length, width, thickness, upper, lower, front, rear, left, right, vertical, horizontal, top, bottom, inner, outer, clockwise, counterclockwise, etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the description of this invention; therefore, they should not be construed as limiting this invention. Furthermore, terms such as first, second, etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features shown. In the description of this invention, unless otherwise expressly specified and limited, terms such as installation, connection, linking, etc., should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] See Figures 1 to 12The present application relates to a method for preparing a slanted groove bolt, comprising the following steps: S10: cutting: cutting metal material of appropriate diameter into metal rods of appropriate length; S20: cold heading forming one: forming a frustum 11 at one end of the metal rod by cold heading process; S30: cold heading forming two: forming a bolt head 13 at the other end of the metal rod by cold heading process; S40: cold heading forming three: shaping the bolt head 13 by cold heading process; S50: cold heading forming four: forming an anti-loosening ridge 14 on the inner surface of the bolt head 13 by cold heading process, and forming a slanted groove 12 on the frustum 11; S60: thread rolling: rolling threads on a thread rolling plate 3, wherein the thread rolling plate 3 is provided with an anti-loosening thread forming area 32 for rolling anti-loosening threads 16.

[0031] Specifically, in step S50, a cold heading operation is performed using a dedicated cold heading die, from which the material is attached... Figure 4 To be continued Figure 6 As can be seen, the cold heading mold 2 has a through hole 21 for inserting a metal rod; one side surface of the cold heading mold 2 has several grooves 21 distributed along the through hole opening, which are used for cold heading to form anti-loosening protrusions 14. The inner wall of the through hole opening on the other side surface of the cold heading mold 2 is provided with a protrusion 23, which is used for cold heading to form oblique grooves 12.

[0032] Furthermore, from the appendix Figure 7 To be continued Figure 9 As can be seen from the above, in this application, the thread rolling plate 3 is provided with a conventional thread forming area 31 and an anti-loosening thread forming area 32. The anti-loosening thread forming area 32 has several symmetrically arranged protrusions 321 on both sides of the thread forming protrusion, which are used to roll out anti-loosening threads 16 during the thread rolling process.

[0033] Appendix Figure 1 The diagram shows the state diagrams of the metal rod transforming into a bolt (before thread rolling) in the preparation method of this application. There are five states: state a, state b, state c, state d, and state e. State a is the cut metal rod; state b is a three-dimensional view of the frustum 11 cold-forged at one end; state c is a three-dimensional view of the bolt cap 13 cold-forged at the other end; state d is a three-dimensional view of the bolt cap 13 after shaping; and state e is a three-dimensional view of the oblique groove 12 and anti-loosening ridge 14 cold-forged, and the countersunk hole on the end face of the bolt cap 13 is also cold-forged. Then, the bolt in state e is thread rolled to obtain the final oblique groove bolt with anti-loosening function.

[0034] The preparation method in this application adopts cold heading and wire rolling processes, and the overall preparation method is simple.

[0035] Bolts prepared by the above method, such as Figures 10 to 12As shown in the figure, the bolt includes a bolt shank 1 and a bolt cap 13. The bolt shank 1 is provided with threads 15, and the threads 15 include narrow anti-loosening threads 16. Specifically, from... Figure 12 As can be seen in the enlarged image, compared to the conventional threaded protrusion 158, the anti-loosening threaded protrusion 168 has a narrower protruding section. Several anti-loosening thread segments 16 are aligned and arranged in the axial direction of the bolt shank 1 to form anti-loosening thread segments. The bolt shank 1 has three or four anti-loosening thread segments; the figure shows four evenly distributed segments. In this structure, during the bolt tightening process, the anti-loosening threads 16 can effectively remove paint from the nut surface, resulting in better electrical contact.

[0036] As can be seen from the attached drawings, the outer end of the bolt rod 1 is provided with a frustum 11, on which several axially distributed oblique grooves 12 are provided. Four grooves are shown in the figure, evenly distributed. During the bolt tightening process, the oblique grooves 12 can effectively remove residues, paint, and other foreign matter from the nut hole. The inner side of the bolt cap 13 is provided with several anti-loosening protrusions 14, which can effectively press into the contact surface after tightening, thus preventing loosening.

[0037] As can be seen from the above description, the method for preparing oblique grooved bolts in this application can efficiently produce bolts and improve the consistency of bolts through mold control. The prepared bolts have oblique grooves and notched threads, which can effectively remove foreign matter such as residue and paint from the nut hole during the screwing process, ensuring the electrical connection effect. Moreover, the bolts have a good anti-loosening effect after screwing in, making them a very good high-strength, tough, and weather-resistant fastener.

[0038] The scope of protection of this invention includes, but is not limited to, the above embodiments. The scope of protection of this invention is defined by the claims. Any substitutions, modifications, or improvements to this technology that are easily conceived by those skilled in the art fall within the scope of protection of this invention.

Claims

1. A method of manufacturing a slant groove bolt, characterized by, The method comprises the following steps: S10: cutting: cutting the metal material with a proper diameter into metal rods with a proper length; S20: cold heading forming one: forming a circular platform (11) on one end of the metal rod through a cold heading process; S30: cold heading forming two: forming a bolt cap (13) on the other end of the metal rod through a cold heading process; S40: cold heading forming three: shaping the bolt cap (13) through a cold heading process; S50: cold heading forming four: forming anti-loose protrusions (14) on the inner surface of the bolt cap (13) and forming inclined grooves (12) on the circular platform (11) through a cold heading process; S60: thread rolling: rolling threads on a thread rolling plate (3), and the thread rolling plate (3) is provided with an anti-loose thread forming area (32) for rolling anti-loose threads (16).

2. The method of claim 1, wherein the bolt is a slant groove bolt. In step S50, the cold heading operation is performed by a special cold heading die, the cold heading die (2) has a through hole (21) for inserting the metal rod; the cold heading die (2) has a plurality of grooves (21) distributed along the through hole on one side surface, and the grooves (21) are used for cold heading forming the anti-loose protrusions (14).

3. The method of claim 2, wherein the oblique groove bolt is manufactured by the steps of: The other side surface of the cold heading die (2) is provided with a protrusion (23) on the inner wall of the through hole, and the protrusion (23) is used for cold heading forming the inclined grooves (12).

4. The method of claim 3, wherein the slant groove bolt is manufactured by the steps of: The thread rolling plate (3) is provided with a conventional thread forming area (31) and an anti-loose thread forming area (32), and the thread forming protrusions in the anti-loose thread forming area (32) are provided with a plurality of protrusions (321) symmetrically arranged on both sides.

5. A bolt characterized in that, The bolt is prepared by the method in any one of claims 1 to 4.

6. A bolt according to claim 5, wherein The bolt comprises a bolt rod (1) and a bolt cap (13), the bolt rod (1) is provided with threads (15), and the threads (15) have narrow anti-loose threads (16), a plurality of anti-loose threads (16) are arranged in alignment in the axial direction of the bolt rod (1) to form an anti-loose thread section, and the bolt rod (1) is provided with three or four anti-loose thread sections.

7. A bolt according to claim 6, wherein The outer end of the bolt rod (1) is provided with a circular platform (11), and the circular platform (11) is provided with a plurality of axially distributed inclined grooves (12).

8. A bolt according to claim 7, wherein The inner side of the bolt cap (13) is provided with a plurality of anti-loose protrusions (14).

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