Technique for manufacturing vehicle door bonnet lock nut plate

Abstract

The invention discloses a manufacturing process of a lock nut panel for a vehicle door. The lock nut panel is a baseplate provided with two lug bosses, each lug boss is provided with a screw hole, and the baseplate is provided with a hem and two square holes; and the lock catch nut panel for a front door uses Type 45 steel. The manufacturing process comprises the following steps: feeding sheet materials, stretching 1, stretching 2, stretching 3, stretching 4, stretching 5, molding, punching, shaping, ripping edges, punching the square holes, folding the hem, grinding the platform, tapping thread, quenching, tempering in low temperature and black oxide coating. By adopting the structure, the invention ensures the quality of components and the security of the whole vehicle, avoids the problem of high scrap rate of components due to instable quality, and effectively saves the cost.

Description

technical field [0001] The invention relates to a part manufacturing process, in particular to a manufacturing process of a door lock nut plate. Background technique [0002] The car's front door lock nut plate is used to fix the front door lock. In order to ensure driving safety, the technical requirements for the car's front door lock nut plate (GB / T3098.2-2000, 10.9 standard) are: (1) The guaranteed load requirement reaches level 10 (38100N); (2) the minimum torque is greater than or equal to 25NM; (3) the Rockwell hardness HRC46-50; (4) meet the 100,000 times door opening and closing test. [0003] The front door lock nut plate made of the original domestically produced substitute material H262YD+ZF50 / 50 cannot meet the engineering requirements. By analyzing the chemical composition of CKD parts, 45# steel is used to manufacture the part, and a new production process is adopted: after the annealed 45# steel is formed and processed, it is then quenched and heat treated. ...

AI Technical Summary

Problems solved by technology

Although the trial-produced parts can meet the engineering requirements, due to the high hardness of 45# steel, the drawing performance is poor, although the annealing process used in the drawing process can reduce the hardness and improve the drawing performance, but because the annealing process does not have a protective atmosphere (requires a special Annealing furnace, there is no supplier in China with this capability), which leads to decarburization of some parts materials during the annealing process, so the hardness of the parts decreases in subsequent processing, and the height of some nut plate teeth is 1-1.5 teeth shorter than the requirement, resulting in poor meshing, Guaranteed load does not reach level 10, and the material of the thread mouth becomes thinner, the quality of the parts is unstable, and the scrap rate is high

[0005] On November 30, 2006, the nut plate cracked when the lock was installed at the loading site. The original production process could not guarantee the quality of the parts, which led to a high scrap rate, which seriously affected the quality of the vehicle, the production cost and the loading efficiency.

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