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High-strength bolt and machining method thereof

A technology of high-strength bolts and processing methods, applied in the direction of manufacturing tools, metal material coating technology, furnace types, etc., can solve problems such as fractures or cracks, difficulty in ensuring strength, and broken rods, so as to improve hardness and corrosion resistance , Improve cold working performance, improve plastic toughness and delayed fracture resistance

Inactive Publication Date: 2020-01-07
JIANGSU YONGHAO HIGH STRENGTH BOLT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Bolts are commonly used fasteners in the machinery industry. The current processing method is generally turning and forming, and the strength is often difficult to guarantee. Sometimes unsafe phenomena such as U-turn and rod breakage occur during use, which is very harmful to industrial production. The production method of high-strength bolts is studied and improved to ensure the quality stability of high-strength bolts, which plays an important role in the development of technology and economy. In addition, when bolts are in a relatively humid environment, they are prone to rust and corrosion, eventually leading to breakage or cracks , forming a potential source of accidents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: A high-strength bolt. The components in the bolt include C 0.30%, Mn0.5%, Si 0.28%, P 0.018%, S 0.018%, Ni 0.3%, and Sn 0.05% by mass percentage. Cu 0.1%, Mo 0.2%, Cr 0.9%, Mg 0.03%, B 0.02%, the balance is Fe and inevitable impurities.

[0023] A method for processing high-strength bolts includes the following steps:

[0024] Alloy casting: spheroidize the steel raw materials prepared from the components according to the specific gravity ratio in the furnace, and then straighten the spheroidized raw materials and cut them into strips to obtain a blank;

[0025] Cold forging: Put the cut into strips into the mold cavity at room temperature, and extrude the head and rod required to form the bolt to make a semi-finished product;

[0026] Roll forming: the semi-finished bolts are rolled to form threads through a compound rolling mill;

[0027] Heat treatment: place the rolled bolts in the furnace, and go through the steps of heating up-keeping warm-then heating up-the...

Embodiment 2

[0032] Embodiment 2: A high-strength bolt. The components in the bolt include C 0.35%, Mn 0.6%, Si 0.30%, P 0.020%, S 0.020%, Ni 0.4%, Sn 0.07% by mass percentage, Cu 0.15%, Mo 0.25%, Cr1.0%, Mg 0.04%, B 0.03%, the balance is Fe and inevitable impurities.

[0033] A method for processing high-strength bolts includes the following steps:

[0034] Alloy casting: spheroidize the steel raw materials prepared from the components according to the specific gravity ratio in the furnace, and then straighten the spheroidized raw materials and cut them into strips to obtain a blank;

[0035] Cold forging: Put the cut into strips into the mold cavity at room temperature, and extrude the head and rod required to form the bolt to make a semi-finished product;

[0036] Roll forming: the semi-finished bolts are rolled to form threads through a compound rolling mill;

[0037] Heat treatment: place the rolled bolts in the furnace, and go through the steps of heating up-keeping warm-then heating up-then ...

Embodiment 3

[0042] Embodiment 3: A high-strength bolt. The components in the bolt include C 0.38%, Mn 0.7%, Si 0.32%, P 0.024%, S 0.024%, Ni 0.5%, and Sn 0.10% by mass percentage. Cu 0.2%, Mo 0.3%, Cr 1.2%, Mg 0.05%, B 0.05%, the balance is Fe and unavoidable impurities.

[0043] A method for processing high-strength bolts includes the following steps:

[0044] Alloy casting: spheroidize the steel raw materials prepared from the components according to the specific gravity ratio in the furnace, and then straighten the spheroidized raw materials and cut them into strips to obtain a blank;

[0045] Cold forging: Put the cut into strips into the mold cavity at room temperature, and extrude the head and rod required to form the bolt to make a semi-finished product;

[0046] Roll forming: the semi-finished bolts are rolled to form threads through a compound rolling mill;

[0047] Heat treatment: place the rolled bolts in the furnace, and go through the steps of heating up-keeping warm-then heating up-t...

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PUM

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Abstract

The invention discloses a high-strength bolt. The bolt comprises the following components, by weight, of: 0.30% to 0.38% of C, 0.5% to 0.7% of Mn, 0.28% to 0.32% of SI, 0.018% to 0.024% of P, 0.018% to 0.024% of S, 0.3% to 0.5% of Ni, 0.05% to 0.10% of Sn, 0.1% to 0.2% of Cu, 0.2% to 0.3% of Mo, 0.9% to 1.2% of Cr, 0.03% to 0.05% of Mg, 0.02% to 0.05% of B and the balances Fe and inevitable impurities. The invention further discloses a machining method for the high-strength bolt. The bolt which adopts the components in percentage and the the machining method disclosed by the invention is excellent in strength value, can effectively resist corrosion and prolongs the service life of the bolt.

Description

Technical field [0001] The invention relates to a high-strength bolt and a processing method thereof, and belongs to the technical field of bolt production. Background technique [0002] Bolts are commonly used fasteners in the machinery industry. The current processing method is generally turning and forming, and the strength is often difficult to guarantee. Sometimes in use, unsafe phenomena such as U-turns and rod breaks may occur, which are very harmful to industrial production. High-strength bolt production methods are researched and improved to ensure the quality stability of high-strength bolts, which plays an important role in the development of technology and economy. In addition, when the bolts are in a relatively humid environment, they are prone to rust and corrosion, which will eventually lead to fractures or cracks. , Forming a potential source of accidents. Summary of the invention [0003] In order to solve the shortcomings of the prior art, the present invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C22C38/54C23C22/50C21D9/00
CPCC21D9/0093C22C38/002C22C38/008C22C38/02C22C38/04C22C38/42C22C38/44C22C38/54C23C22/50
Inventor 朱汉华朱银奎
Owner JIANGSU YONGHAO HIGH STRENGTH BOLT
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