Nut plate

A nut plate, main body technology, applied in the direction of nuts, threaded fasteners, connecting components, etc., can solve the problems of the nut not meeting the required peeling torque, difficult to weld, etc., to save the high temperature reheating process, easy welding, high The effect of low temperature impact toughness

Inactive Publication Date: 2016-03-23
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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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 fastener, in particular to a nut plate and belongs to the technical field of alloy materials. The nut plate comprises a body, bosses and positioning holes, wherein the bosses are symmetrically arranged in the positions, near the end portions, of the two ends of the body; the number of the positioning holes is an even number; the positioning holes are symmetrically formed in the surface of the body; the middle axis position of the body is hollow; the nut plate is formed by machining high-strength alloy steel. The high-strength alloy steel of the nut plate comprises, by mass, 0.02-0.10% of C, 0.05-0.30% of Si, 0.20-0.50% of Mn, 0.15-1.20% of Al, 0.50-1.2% of Cr, 0.003-0.01% of V, 0.08-0.20% of B, 0.01-0.03% of Ti, 0-0.035% of S, 0-0.035% of P, and the balance Fe. The constituents and mass percentage of the nut plate are reasonable in compatibility, higher strength and hardness are achieved, higher plasticity and toughness are also achieved, the machining performance of the nut plate is improved remarkably, and the nut plate is easy to weld.

Description

technical field [0001] The invention relates to a fastener, in particular to a nut plate, and belongs to the technical field of 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 body, and has been widely used in the automoti...

Claims

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Application Information

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IPC IPC(8): F16B37/06C21D6/00C21D8/02C22C38/06C22C38/12C22C38/14C22C38/18C22C38/32C23C22/40C23C22/78
CPCC21D6/002C21D8/0205C22C38/06C22C38/12C22C38/14C22C38/18C22C38/32C23C22/40C23C22/78F16B37/061
Inventor 任鹏坤
Owner NINGBO JINPENG HIGH STRENGTH FASTENER
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