High-strength and high-precision hexagonal hole knurled cup head bolt

Abstract

The utility model relates to the field of hexagonal hole bolts, and discloses a high-strength and high-precision hexagonal hole knurling cup head bolt which comprises a bolt rod part, a bolt head part is fixed at one end of the bolt rod part, a hexagonal groove is formed in the side, away from the bolt rod part, of the bolt head part, and an extrusion ring is fixedly arranged on the surface of the bolt rod part in a sleeved mode. And one side of the extrusion ring is fixed to one side of the bolt head, the surface of the bolt rod part is fixedly sleeved with a gasket, and one side of the gasket is fixed to one side of the bolt head. According to the utility model, the tip end of the extrusion ring can be extruded into the hole groove along with the screwing of the bolt rod part, a worker can manufacture the bolt rod part and the bolt head part by adopting a three-mold three-process, and then quenching and tempering of heat treatment are carried out, so that the toughness and the strength of a bolt finished product are improved; the mechanical performance of the bolt finished product meets the requirement that the core hardness is 40-44 HRC, then the strength of the hexagonal hole bolt can be improved, and the risk that the hexagonal hole bolt is broken when used is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hexagonal hole bolts, in particular to a high-strength and high-precision hexagonal hole knurled cup head bolt. Background Art

[0002] Hexagonal bolts are common mechanical fasteners with a regular hexagonal head, making them easy to rotate and tighten with tools like wrenches. As an important mechanical fastener, hexagonal bolts feature a simple structure, ease of use, and high load-bearing capacity, playing an indispensable role in modern industry.

[0003] In the prior art, traditional hexagon socket bolts often have limited strength and are prone to breakage in complex working environments, increasing the risk of hexagon socket bolts breaking during use. Utility Model Content

[0004] The purpose of the utility model is to provide a high-strength and high-precision hexagonal hole knurled cup head bolt to solve the problem that the hexagonal bolt is prone to breakage in a complex working environment, which increases the risk of breakage during use.

[0005] In order to achieve the above-mentioned purpose of the utility model, the utility model adopts the following technical solutions: a high-strength and high-precision hexagonal hole knurled cup head bolt, comprising a bolt shank, a bolt head is fixed to one end of the bolt shank, a hexagonal groove is provided on the side of the bolt head away from the bolt shank, an extrusion ring is provided on the surface fixing sleeve of the bolt shank, one side of the extrusion ring is fixed to one side of the bolt head, and a gasket is provided on the surface fixing sleeve of the bolt shank, one side of the gasket is fixed to one side of the bolt head.

[0006] Preferably, the core hardness of the bolt shank and the bolt head is 40-44HRC.

[0007] Preferably, the lower limit of the opposite side dimension of the hexagonal groove is 12 mm.

[0008] Preferably, a plurality of second anti-slip strips 7 are fixed to one side of the gasket 4 close to the bolt shank 1 .

[0009] Preferably, a plurality of first anti-slip strips are fixed on the surface of the bolt head.

[0010] Preferably, the gasket is made of stainless steel, and the diameter of the gasket is larger than the diameter of the bolt head.

[0011] Compared with the existing technology, the high-strength and high-precision hexagonal knurled cup head bolt adopting the above technical solution has the following beneficial effects:

[0012] 1. When the staff uses the bolt shank to screw in and fix, the presence of the extrusion ring can increase the strength of the connection between the bolt shank and the bolt head, and the tip of the extrusion ring can be squeezed into the inside of the hole groove as the bolt shank is screwed in, increasing the pressure between the hole groove and the bolt shank, thereby increasing the firmness of the bolt shank in the hole groove. The staff will use three molds and three processes to make the bolt shank and the bolt head. In this process, a special mold will be used to cold-forge the head of the bolt into an inner hexagonal shape, and then the surface of the bolt shank will be threaded with a washboard to form a thread. Then, the quenching and tempering of the heat treatment are performed to increase the toughness and strength of the finished bolt, so that the mechanical properties of the finished bolt meet the core hardness of 40-44HRC, thereby increasing the strength of the hexagonal hole bolt and reducing the risk of breakage when using the hexagonal hole bolt;

[0013] Second, the washer is directly fixed to one side of the bolt head, thus reducing the probability of workers forgetting to add the washer. The washer can increase the contact area between the bolt head and the mounting surface, reduce the pressure per unit area, and prevent the mounting surface from being excessively worn or damaged. At the same time, the second anti-slip strip on the bottom of the washer can increase the roughness of the washer and the mounting surface, increase the friction between the washer and the mounting surface, and reduce the probability of the bolt shank rotating in the hole slot.

[0014] 3. When a worker uses a wrench or other equipment to rotate the bolt head, it will come into contact with the first anti-slip strip on the surface of the bolt head. Using multiple first anti-slip strips arranged together can increase the roughness of the bolt head surface, thereby increasing the friction between the wrench and other tools and the bolt head, thereby increasing the convenience when turning the bolt head. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a side view schematic diagram of an embodiment.

[0016] Figure 2 Schematic cross-sectional view of an embodiment.

[0017] Figure 3 Schematic top view of an embodiment.

[0018] In the figure: 1. Bolt shank; 2. Bolt head; 3. Hexagonal slot; 4. Washer; 5. First anti-slip strip; 6. Extrusion ring; 7. Second anti-slip strip. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] like Figure 1-Figure 3As shown, a high-strength and high-precision hexagonal hole knurled cup head bolt includes a bolt shank 1, one end of which is fixed with a bolt head 2. The bolt shank 1 and the bolt head 2 are both made by three molds and three processes. A hexagonal groove 3 is provided on the side of the bolt head 2 away from the bolt shank 1. The surface fixing sleeve of the bolt shank 1 is provided with an extrusion ring 6, one side of the extrusion ring 6 is fixed to one side of the bolt head 2, and the surface fixing sleeve of the bolt shank 1 is provided with a gasket 4, one side of the gasket 4 is fixed to one side of the bolt head 2, the gasket 4 is made of stainless steel, the diameter of the gasket 4 is larger than the diameter of the bolt head 2, the core hardness of the bolt shank 1 and the bolt head 2 is 40-44HRC, and the lower limit of the opposite side size of the hexagonal groove 3 with models M5 to M12 is 12mm.

[0021] During use, when the staff uses the bolt shank 1 to screw in and fix it, the presence of the extrusion ring 6 can increase the strength of the connection between the bolt shank 1 and the bolt head 2, and the tip of the extrusion ring 6 can be squeezed into the inside of the hole groove as the bolt shank is screwed in, increasing the pressure between the hole groove and the bolt shank 1, thereby increasing the firmness of the bolt shank 1 in the hole groove. The staff will use three molds and three processes to make the bolt shank 1 and the bolt head 2. In this process, a special mold will be used to cold-forge the head of the bolt into an inner hexagonal shape, and then a washboard will be used to roll the surface of the bolt shank 1 to form a thread. Then, the quenching and tempering of the heat treatment are performed to increase the toughness and strength of the finished bolt, so that the mechanical properties of the finished bolt meet the core hardness of 40-44HRC, thereby increasing the strength of the hexagonal hole bolt and reducing the risk of breakage when using the hexagonal hole bolt.

[0022] like Figure 2 As shown, a plurality of second anti-slip strips 7 are fixed to one side of the gasket 4 close to the bolt shank 1 .

[0023] During use, the gasket 4 is directly fixed on one side of the bolt head 2, thereby reducing the probability of the staff forgetting to add the gasket 4. The gasket 4 can increase the contact area between the bolt head 2 and the mounting surface, reduce the pressure per unit area, and prevent the mounting surface from being excessively worn or damaged. At the same time, the second anti-slip strip 7 on the bottom surface of the gasket 4 can increase the roughness of the gasket 4 and the mounting surface, increase the friction between the gasket 1 and the mounting surface, and reduce the probability of the bolt rod 1 rotating in the hole groove.

[0024] like Figure 2 As shown, a plurality of first anti-slip strips 5 are fixed on the surface of the bolt head 2 .

[0025] During use, when the staff uses a wrench or other equipment to rotate the bolt head 2, it will come into contact with the first anti-slip strip 5 on the surface of the bolt head 2. Using multiple first anti-slip strips 5 arranged together can increase the roughness of the surface of the bolt head 2, thereby increasing the friction between other tools such as wrenches and the bolt head 2, thereby increasing the convenience when turning the bolt head 2.

[0026] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-strength and high-precision hexagonal knurled cup head bolt, comprising a bolt shank (1), characterized in that: A bolt head (2) is fixed to one end of the bolt shank (1); a hexagonal groove (3) is provided on a side of the bolt head (2) away from the bolt shank (1); an extrusion ring (6) is fixed on the surface of the bolt shank (1); one side of the extrusion ring (6) is fixed to one side of the bolt head (2); a gasket (4) is fixed on the surface of the bolt shank (1); one side of the gasket (4) is fixed to one side of the bolt head (2).

2. The high-strength and high-precision hexagonal knurled cup head bolt according to claim 1, characterized in that: The core hardness of the bolt shank (1) and the bolt head (2) is 40-44HRC.

3. The high-strength and high-precision hexagonal knurled cup head bolt according to claim 1, characterized in that: The lower limit of the opposite side dimension of the hexagonal slot (3) is 12 mm.

4. The high-strength and high-precision hexagonal knurled cup head bolt according to claim 1, characterized in that: A plurality of second anti-slip strips (7) are fixed to one side of the gasket (4) close to the bolt shank (1).

5. The high-strength and high-precision hexagonal knurled cup head bolt according to claim 1, characterized in that: A plurality of first anti-slip strips (5) are fixed on the surface of the bolt head (2).

6. The high-strength and high-precision hexagonal knurled cup head bolt according to claim 1, characterized in that: The gasket (4) is made of stainless steel, and the diameter of the gasket (4) is larger than the diameter of the bolt head (2).

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