Rapid inspection method and braking design for metal stamping parts
With the development of the automotive industry and the advancement of manufacturing technology, people's requirements for the ride comfort and comfort of cars are becoming increasingly high. In the overall layout design stage of passenger cars, in order to minimize driver fatigue, it is very important to set reasonable vehicle parameters and pedal devices through ergonomics analysis, and thus establish a reasonable driving posture.
For metal stamping processing, we need to control the quality of raw materials first. The inspection period can be divided into material acceptance and cleaning, pre production inspection, and post material inspection. The following five inspection methods can be used to inspect the formed stamped parts.
1、 Touch inspection
Wipe the surface of the outer cover clean with clean gauze. The inspector needs to wear touch gloves and touch the surface of the stamped part along the longitudinal direction, which depends on the inspector's experience. Oil stones can be used to polish the suspicious area being detected and verify it, but this method is still a viable inspection method.
2、 Oil stone polishing
1. First, use clean gauze to wipe the surface of the outer cover clean, and then polish it with an oilstone. Use relatively small oilstones to polish areas with arcs and difficult to reach areas
2. The selection of oil stone particle size depends on the surface condition. Suggest using fine-grained oilstone. The direction of oilstone polishing is basically along the longitudinal direction, and it fits well with the surface of the stamped part. In some places, horizontal polishing can also be added.
3、 Flexible mesh polishing
Wipe the surface of the outer cover clean with clean gauze. Use a flexible sand mesh to tightly adhere to the surface of the stamped part and polish it longitudinally until the entire surface is covered. Any dents or indentations will be easily detected.
4、 Oil coating inspection
Wipe the surface of the outer cover clean with clean gauze. Use a clean brush to evenly apply oil in the same direction to the entire outer surface of the stamped part. Inspect the stamped parts that have been coated with oil under strong light. It is recommended to place the stamped parts vertically on the vehicle body. This method can easily detect tiny bumps, dents, and ripples on stamped parts.
5、 Visual inspection
Visual inspection is mainly used to discover visual abnormalities and macroscopic defects in stamped parts.
The main factor causing driver fatigue during vehicle operation is frequent stepping on pedal devices, including accelerator pedals, brake pedals, and clutch pedals. Therefore, when designing and arranging the pedal device, it is necessary to fully integrate the key points of ergonomics, set a reasonable pedal layout, make it easy for the driver to operate, and prevent the driver's misoperation.
Among them, the brake pedal device is one of the important security components of the vehicle braking system, and the design of the brake pedal directly affects the driving performance. The reasonable design and arrangement of brake pedals are of great significance in reducing driver fatigue and improving ride comfort.
Brake pedal design
Elaborate on the process and key points of designing and arranging brake pedals for passenger cars from the aspects of structural composition, regulatory requirements, and structural design.
Structure and classification of brake pedals
The brake pedal is mainly composed of a pedal swing arm, a pedal bracket Composed of components such as tread, return spring, brake light switch, bolts, nuts, and fasteners.
According to different classification methods, pedal types also vary. According to the parameter classification of pedal ratio, there are fixed pedal ratio and variable pedal ratio forms. According to the cross-sectional form of the pedal swing arm, there are thick plate type and hollow type. According to the material type of the pedal swing arm, there are aluminum alloy type, resin type, and ordinary stamped steel plate type.
The regulations and industry standards related to brake pedals have made provisions for pedal force, pedal travel, and layout clearance. For specific reference, please refer to "GB7258 Technical Conditions for Motor Vehicle Operation", "GB21670 Technical Requirements and Test Methods for Passenger Car Braking Systems", "GB/T17346 Sedans - Lateral Spacing of Pedal Pedals", "QC/T788 Performance Requirements and Bench Test Methods for Automotive Pedal Devices", and "C-NCAP Management Rules 2015 Edition".
