In response to the more stringent accident regulations and regulations recently promulgated, it is even required to use thinner steel plates with higher strength, which can not only improve the safety in a car accident, but also avoid the increase in the weight of the car body. The three main strength properties required for thin steel plates for car body parts are: tensile hardness; bending resistance; and breaking strength. The mechanical properties and thickness of the material have different effects on the three strengths.
The tensile hardness depends on the Young’s modulus; the bending resistance depends on the material’s deformation resistance and thickness; the breaking strength depends on the Young’s modulus, deformation resistance and thickness. Generally speaking, materials with high tensile strength are the best in terms of resistance to deformation. It can be seen from this that the use of high-strength steel sheets instead of ordinary thin steel sheets, although there is no improvement in stretch forming, can simultaneously improve bending resistance and breaking strength. Therefore, the use of high-strength thin steel plates instead of ordinary thin steel plates for parts that require high fracture strength and bending resistance can ensure a reduction in thickness, which opens up a new way to reduce the weight of the car body without increasing material costs. High-strength steel sheets used in car bodies must also meet requirements such as punchability, weldability, corrosion resistance, and strength characteristics. Grade material characteristics, application parts, inner panel, outer panel, frame application parts, commercial grade, low cost, used for general forming reinforced parts, shock absorbers, deep drawing grade, deep drawing, wide application range, roof, beam drying hardening, deep drawing grade, excellent bending resistance Shell, cover, deep drawing, high r-value, front protective plate, dual-phase, low yield point, high strength, low yield point, and door beams. Production has an impact. Crash safety People are increasingly concerned about higher fuel efficiency, and the requirements for improving passenger protection measures in car accidents are becoming stronger. The safety of vehicles can be divided into active safety (that is, to prevent the occurrence of a car accident) and passive safety (that is, to ensure the safety of passengers in the event of a car accident). The latter is directly related to the robustness of the car body. The way to improve safety in a car accident is to enable the structure of the engine box to absorb impact energy and make the box stronger to ensure the safety of passengers. As a measure to deal with car accidents, thicker steel plates are used on each side of the engine box to enhance the ability to absorb impact energy. In order to improve the front impact resistance, not only the side but also the vibration plate and other components are also designed to absorb impact energy.
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