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Machining method for nut plate

A processing method and nut plate technology, which are used in manufacturing tools, metal material coating processes, heat treatment equipment, etc., can solve the problems of difficult welding, the nut can not meet the required peeling torque, etc., and achieve easy welding and eliminate high-temperature reheating. process, the effect of improving plasticity

Inactive Publication Date: 2016-03-02
NINGBO JINPENG HIGH STRENGTH FASTENER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of high-strength alloy steel increases the defects of weak welding in the nut projection welding process. The weak welding is mainly manifested in the fact that the nut does not meet the required peeling torque and is not easy to weld.

Method used

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  • Machining method for nut plate
  • Machining method for nut plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Pretreatment: high-strength alloy steel (high-strength alloy steel is composed of the following mass percentages: C: 0.10%, Si: 0.05%, Mn: 0.50%, Al: 0.15%, Cr: 1.20%, V: 0.003% , B: 0.20%, Ti: 0.01%-0.03%, S ≤ 0.035%, P ≤ 0.035%, and the rest is Fe) quenching and tempering treatment at 880°C, heat preservation for 2h;

[0035] Heat treatment: Forge the quenched and tempered high-strength alloy steel at 1220°C, hold it for 0.3h, and then use the residual heat of forging for quenching treatment. When the temperature is cooled to 900°C, it is immediately water-cooled to room temperature at a rate of 25°C / min. Then heat it to 520°C for tempering treatment for 2 hours, and finally cool it to room temperature with oil at a rate of 22°C / min to obtain a semi-finished nut plate;

[0036] Surface treatment: degrease and derust the semi-finished nut plate in turn (the temperature of degreasing and derusting treatment is 30°C, the treatment time is 10min, and the treatment liquid ...

Embodiment 2

[0038] Pretreatment: high-strength alloy steel (high-strength alloy steel is composed of the following mass percentages: C: 0.04%, Si: 0.25%, Mn: 0.25%, Al: 1.00%, Cr: 0.60%, V: 0.01% , B: 0.10%, Ti: 0.025%, S ≤ 0.035%, P ≤ 0.035%, the rest is Fe) quenching and tempering treatment at 820 ° C, heat preservation 2h;

[0039] Heat treatment: Forge the quenched and tempered high-strength alloy steel at 1200°C, keep it warm for 0.5h, and then quench it with forging waste heat. When the temperature is cooled to 900°C, it is immediately water-cooled to room temperature at a rate of 22°C / min. Then heat it to 500°C for tempering treatment for 2 hours, and finally cool it to room temperature with oil at a rate of 20°C / min to obtain a semi-finished nut plate;

[0040] Surface treatment: degrease and derust the semi-finished nut plate in turn (the temperature of degreasing and derusting treatment is 35°C, the treatment time is 8min, and the treatment liquid used is: thiourea 2.2g / L, sodiu...

Embodiment 3

[0042] Pretreatment: high-strength alloy steel (high-strength alloy steel is composed of the following mass percentages: C: 0.06%, Si: 0.15%, Mn: 0.35%, Al: 0.60%, Cr: 0.70%, V: 0.009% , B: 0.12%, Ti: 0.022%, S ≤ 0.035%, P ≤ 0.035%, the rest is Fe) quenching and tempering treatment at 900 ° C, heat preservation 2h;

[0043] Heat treatment: Forge the quenched and tempered high-strength alloy steel at 1190°C, keep it warm for 0.4h, and then quench it with forging waste heat. When the temperature cools to 900°C, it is immediately water-cooled to room temperature at a rate of 20°C / min. Then heat it to 480°C for tempering treatment for 2 hours, and finally cool it to room temperature at a speed of 18°C / min to obtain a semi-finished nut plate;

[0044] Surface treatment: The semi-finished nut plate is degreased and derusted in turn ((The temperature of degreasing and derusting treatment is 40°C, the treatment time is 8min, the treatment liquid used is: thiourea 3.0g / L, sodium dihydr...

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Abstract

The invention relates to a machining method for a nut plate and belongs to the field of machining of alloy materials. The machining method includes the following steps that pretreatment is carried out, and quenching and tempering are carried out on high-strength alloy steel; heat treatment is carried out, the quenched and tempered high-strength alloy steel is forged and formed at the temperature of 1150-1220 DEG C, heat preservation is conducted for 0.3-0.6 h, quenching treatment is carried out by means of forging waste heat, the high-strength alloy steel is immediately water-cooled to the room temperature when cooled to 900 DEG C, the high-strength alloy steel is heated to 450-520 DEG C to be subjected to tempering for 2-3 h, finally the high-strength alloy steel is oil-cooled to the room temperature, and a semi-finished nut plate is obtained; and surface treatment is carried out, the semi-finished nut plate is sequentially subjected to oil and rust removal, activating treatment, blackening and passivation, and the nut plate is obtained. According to the nut plate, the high-strength alloy steel with components combined reasonably is selected to be subjected to quenching and tempering, forging, quenching, tempering and surface blackening, so that the machining cycle is greatly shortened, and the strength, hardness, toughness, corrosion resistance and abrasion resistance of the nut plate are greatly improved; meanwhile, the machining performance of the nut plate is improved, and the nut plate is easy to weld.

Description

technical field [0001] The invention relates to a processing method of a fastener, in particular to a processing method of a nut plate, and belongs to the field of processing alloy materials. Background technique [0002] The body is an important assembly of the vehicle, and the quality of the welding of the body directly affects the service life of the vehicle. Welding processes in automobile manufacturing include spot welding, projection welding, arc welding, stud welding, laser welding, laser hybrid welding, etc. Projection welding is a variant of spot welding. With the rapid development of the automobile industry, the demand for high efficiency and individualization is becoming more and more obvious. In the manufacturing process of the body-in-white, welding nuts using projection welding technology can accurately locate the welding position of the nuts and improve welding quality. Compared with CO 2 Gas shielded welding can reduce the harm of harmful gases to the human...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C23C22/40C21D9/00
Inventor 任鹏坤
Owner NINGBO JINPENG HIGH STRENGTH FASTENER
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