High Precision Sheet Metal Stamping for Automotive

　　This test report focuses on High Precision Sheet Metal Stamping for Automotive. In accordance with authoritative testing standards in the automotive industry, through professional testing equipment and scientific testing processes, comprehensive tests are conducted on the core indicators of the product, including dimensional accuracy, surface quality, mechanical properties, weather and corrosion resistance, and assembly adaptability. The entire process follows standardized testing procedures to ensure that the test data is true, accurate and traceable, providing an authoritative testing basis for product quality judgment, market access and application promotion, highlighting the quality strength and compliance of high-precision sheet metal stamping parts for automobiles, and meeting the strict quality requirements of the automotive industry for core components.

　　The basic test information is clear, and the process is standardized and traceable. The entrusting unit of this test is an auto parts manufacturing enterprise, and the test products are high-precision sheet metal stamping parts for automobiles (including series models such as body structural parts, interior brackets, and chassis connectors). The number of submitted samples is 50, and the number of sampled samples is 5 (in accordance with GB/T 2828.1-2012 sampling standard, general inspection level Ⅱ, AQL 1.0). The test location is the laboratory of the National Auto Parts Quality Supervision and Inspection Center, the test date is fully traceable, the test personnel are all qualified for auto parts testing, and the test equipment has passed national metrological certification, ensuring that the test process is compliant and the test results are reliable, meeting the authoritative standard requirements of the test report.

　　The test basis is authoritative, and the judgment standard is clear. This test strictly follows the core testing standards of the domestic and foreign automotive industry. Domestically, it is based on national standards such as GB/T 13914-2020 "Dimensional Tolerances for Stamped Parts" and GB/T 231.1-2018 "Brinell Hardness Test for Metallic Materials". Internationally, it is based on ISO 2768-1:2020 general tolerance standard, ASTM E8/E8M-2021 tensile test method for metallic materials, and VDA 6.3-2022 process audit requirements for the automotive industry. It also conforms to the testing specifications for stamping parts in the IATF 16949:2016 automotive industry quality system, clarifying the standard thresholds, testing methods and judgment rules for each test item, ensuring that the test results are authoritative and comparable.

　　The core indicators are fully tested, and the data is accurately up to standard. Tested by professional equipment, in terms of dimensional accuracy, the tolerance of key hole diameter and hole distance is controlled within ±0.01mm, the flatness is ≤0.1mm/100mm, and the bending dimension deviation is ≤±0.02mm. Tested by Coordinate Measuring Machine (CMM), all sampled products meet the drawing design requirements, with a pass rate of 100%; in terms of surface quality, tested by 10x magnifying glass and eddy current tester, there are no cracks or burrs (burr height ≤0.02mm), the surface roughness Ra ≤1.6μm (mating surface), the coating is uniform without color difference, and there are no defects such as rust and sand holes; in terms of mechanical properties, the tensile strength is ≥340MPa, the hardness reaches HRB 60-80 (cold-rolled steel material), and no fracture or deformation is found after testing by universal testing machine; in terms of weather and corrosion resistance, after 500 hours of neutral salt spray test, the surface rust area is ≤5%, and after high and low temperature cycle test (-40℃~120℃, 50 cycles), there is no deformation or delamination, and all indicators meet the standards.

　　The test conclusion is clear, and the quality is compliant and reliable. This test covers the core quality indicators of high-precision sheet metal stamping parts for automobiles. All sampled products have passed the test, and all tested items meet the domestic and foreign authoritative standards such as GB/T 13914-2020, ISO 2768-1:2020 and IATF 16949:2016, as well as the product design requirements, and are judged as qualified. The test report is attached with complete original test data, defect investigation records and equipment calibration certificates, which can be reviewed at any time. It fully proves that the high-precision sheet metal stamping parts for automobiles have stable quality and reliable performance, can adapt to the assembly needs of various parts such as automobile body, chassis and interior, meet the strict quality control requirements of the automotive industry for core components, provide authoritative testing support for mass production, market access and downstream automaker procurement, and highlight the product's quality competitiveness and industry compliance.