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Processing technique of high-strength large hexagon bolt

A processing technology and hexagonal head technology, applied in the processing field of spare parts, can solve the problem of low strength and achieve the effect of improving strength

Inactive Publication Date: 2018-12-21
宁波瑞国精机工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the strength of the commonly used large hexagonal head bolts is still low, and further research on high-strength large hexagonal head bolts is needed.

Method used

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  • Processing technique of high-strength large hexagon bolt

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A processing technology for high-strength large hexagon head bolts, the processing technology includes the following steps:

[0028] The alloy steel used for high-strength large hexagon head bolts is melted and cooled to form a large hexagon head bolt blank including nuts and bolt rods; the composition elements and mass percentages of the alloy steel used for high-strength large hexagon head bolts are: C: 0.2%, Cr: 1.8%, Si: 0.22%, Mn: 0.15%, Al: 0.08%, Nb: 0.04%, Cu: 0.12%, V: 0.07%, Ni: 0.15%, Ce: 0.008%, Ti: 0.01%, S: 0.02%, P ≤ 0.015%, the balance is Fe and unavoidable impurities; threading is processed on the surface of the bolt shank to obtain semi-finished products of large hexagon head bolts;

[0029] Quench the semi-finished large hexagon head bolts at 900°C first, and then temper at 230°C;

[0030] A SiC composite film layer with a thickness of 4 μm is sprayed on the surface of the semi-finished large hexagon head bolt after tempering to obtain a finished pro...

Embodiment 2

[0032] A processing technology for high-strength large hexagon head bolts, the processing technology includes the following steps:

[0033] The alloy steel used for high-strength large hexagon head bolts is melted and cooled to form a large hexagon head bolt blank including nuts and bolt rods; the composition elements and mass percentages of the alloy steel used for high-strength large hexagon head bolts are: C: 0.25%, Cr: 1.5%, Si: 0.25%, Mn: 0.08%, Al: 0.1%, Nb: 0.03%, Cu: 0.2%, V: 0.05%, Ni: 0.2%, Ce: 0.005%, Ti: 0.02%, S: 0.005%, P≤0.015%, the balance is Fe and unavoidable impurities;

[0034] Process the thread on the surface of the bolt shank to get the semi-finished product of the large hexagon head bolt;

[0035] Quench the semi-finished large hexagon head bolts at 880°C, and then temper at 220°C;

[0036] A SiC composite film layer with a thickness of 5 μm is sprayed on the surface of the semi-finished large hexagon head bolt after tempering to obtain a finished pro...

Embodiment 3

[0038] A processing technology for high-strength large hexagon head bolts, the processing technology includes the following steps:

[0039] The alloy steel used for high-strength large hexagon head bolts is melted and cooled to form a large hexagon head bolt blank including nuts and bolt rods; the composition elements and mass percentages of the alloy steel used for high-strength large hexagon head bolts are: C: 0.15%, Cr: 2.0%, Si: 0.17%, Mn: 0.2%, Al: 0.05%, Nb: 0.06%, Cu: 0.05%, V: 0.1%, Ni: 0.1%, Ce: 0.01%, Ti: 0.005%, S: 0.03%, P≤0.015%, the balance is Fe and unavoidable impurities;

[0040] Process the thread on the surface of the bolt shank to get the semi-finished product of the large hexagon head bolt;

[0041] Quench the semi-finished large hexagon head bolts at 930°C, and then temper at 250°C;

[0042] A SiC composite film layer with a thickness of 3 μm is sprayed on the surface of the semi-finished large hexagon head bolt after tempering to obtain a finished prod...

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Abstract

The invention relates to a processing technique of a high-strength large hexagon bolt, and belongs to the technical field of spare and accessory part processing. The processing technique comprises thefollowing steps of melting alloy steel used for the high-strength large hexagon bolt, and then cooling so as to prepare a large hexagon bolt blank comprising a screw cap and a bolt shank; processingthreads on the surface of the bolt shank so as to obtain a semi-finished product of the large hexagon bolt; quenching the semi-finished product of the large hexagon bolt at 880 to 930 DEG C first, andthen performing tempering treatment at 220 to 250 DEG C; and spraying a SiC composite film layer on the surface of the semi-finished product of the large hexagon bolt after the tempering treatment isperformed so as to obtain a finished product of the large hexagon bolt. According to the processing technique of the hexagon bolt, the SiC composite film layer is sprayed on the surface of the bolt after heat treatment, the hexagon bolt is made of materials which are reasonably matched, the content of other chemical components is optimized, and the chemical components are changed, so that the microscopic structure is changed, and the strength of the hexagon bolt is increased.

Description

technical field [0001] The invention relates to a processing technique for high-strength large hexagon head bolts, and belongs to the technical field of spare parts processing. Background technique [0002] Hex cap screw and large hex bolt Hex bolt, as the name implies, are externally threaded fasteners with a hexagonal head, designed to be turned with a wrench. According to the ASME B18.2.1 standard, the hex cap screw (Hex cap screw) has a smaller head height and stem length tolerance than the general large hex bolt (Hex bolt), so the ASME B18.2.1 hex cap screw is suitable for installation on all hex bolts that can be used places, also where large hex bolts are too large to be used. [0003] At present, there are three main materials for hexagon socket screws on the market: carbon steel, stainless steel, and copper. [0004] (1) Carbon steel. We distinguish low carbon steel, medium carbon steel and high carbon steel and alloy steel by the carbon content in the carbon ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/46C22C38/50C23C24/02C21D1/18
CPCB23P15/00C21D1/18C22C38/005C22C38/02C22C38/04C22C38/06C22C38/42C22C38/46C22C38/48C22C38/50C23C24/02
Inventor 张书翰
Owner 宁波瑞国精机工业有限公司