Processing standards for copper bars
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Copper bar (GBT5585.1-2005)1) Appearance quality: Finished copper and copper alloy busbars are not allowed to have joints, and the surface quality should be smooth and flat, and there should be no defects that are not commensurate with good industrial products; copper and copper alloy busbars are rounded and round There should be no flashes, burrs and cracks at the edges.Narrow side size, 10-20, wide side size 60-200mm, delivery length is generally 2-9m, delivery quality is about 40-100kg 2) Chemical composition: Sampling: select from representative parts, the organization of the sample The composition is uniform, and the sample should be clean before preparation, free of scale, dirt and other debris. If necessary, the sample can be cleaned with ether, acetone, rinsed with alcohol, and then dried..Sample chips can be drilled, but it is necessary to prevent the introduction of impurities, especially iron, and the speed of the sample is controlled to prevent overheating and oxidation. Requirement 3) Dimensions (thickness, width; rounded corner radius; straightness) Take a sample, the length is not less than 1m.When measuring directly on a sample in a loop or a disc, the distance from the end should be at least 1m, when measuring on a bundle of samples, the requirements should be at least 200mm away from the end at both ends: ①thickness ②width ③angle Radius of round side ④Straightness: Straightness of narrow side: 2.80< a ≤ 16.00, 50.00< b ≤ 150.At 00, the straightness is less than 2mm; other specifications are less than 4mm. Straightness of the broad side: hard requirements, no requirements for this product 4) Mechanical properties (tensile strength, elongation; hardness; unidirectional bending) ①Tensile strength, elongation sampling: from one end of the sample that has passed the visual inspection Intercept 3 specimens. The length of the specimen is the original gauge length plus twice the clamping length of the jaws to avoid mechanical damage during sampling. ②Hardness sampling: Intercept a specimen with a length of about 100mm. The surface should be smooth and flat. There are oxide scales, dirt, and grease, and the surface should be able to ensure accurate diameter measurement.When measuring the hardness of the conductor cross-section, heating should be avoided during the preparation of the sample and the surface smoothing and polishing..The thickness of the test piece should be at least 8 times the depth of the indentation.Requirement ③One-way bending sampling: Take 2 flat and straight samples, the thickness of the samples should be the thickness of the thin plate or ribbon product, and the two original surfaces should be retained; the width of the machine-added sample should be 20-25mm, for For thin strip products with a width less than 20mm, the width of the sample should be the full width of the original product, and the length of the sample should be 150mm.The cutting position and direction of the sample are in accordance with the requirements of the relevant product standards.When preparing the sample, the influence of heat and work hardening should be minimized. The surface of the sample should be free of cracks and scars, and the edges should be free of burrs.. Choose the length L of the sample, and the diameter d of the curved cylinder, the thickness of the test piece or the diameter a is related to L=0.5π(d+a)+140(mm) The bending radius requires that the broad side of the copper and copper alloy bus bar be bent 90 degrees, and there should be no cracks on the surface. The diameter of the curved cylinder should be selected according to the thickness a and meet the requirements of the national standard..5) Resistivity sampling: the sample has no joints, no cracks and defects on the surface; the transverse dimension is 1mm and above with the naked eye, and the sample with the lateral size of 1mm and above is inspected with a 20x magnifying glass..; The surface of the sample, especially the contact surface of the current and potential connectors, should be basically free of scars, dust and oil. If necessary, it should be cleaned before measuring the size; it is obtained by dividing 5 times or more at equal intervals along the length of the sample gauge. The relative deviation of the cross-sectional area should not exceed 1% in the benchmark test and 2% in the conventional test; when measuring the mass per unit length, the two ends of the sample should be flat and perpendicular to the longitudinal axis, and the surface of the sample should be free of burrs , Flash and arc edges (serrated edges); samples taken from bulk materials should be taken to prevent significant changes in material properties during sample preparation. Plastic deformation will harden the material processing, increase the resistivity, and heat Anneal the material to reduce the resistivity. If necessary, the reference test sample should be prepared as follows: the sample is pickled and processed to a nominal diameter of 2mm, degreasing, annealing in a protective atmosphere at 500-550 degrees Celsius for 30 minutes, and then in the same protective atmosphere Rapid cooling or rapid transfer in air to water for cooling. Yueqing Renhe Electronics Co., Ltd. is the best copper bar manufacturer in Zhejiang, focusing on the production of new energy electric vehicle battery copper bar connection, electrical connection copper bar, braided copper bar, flexible copper bar connection, cable connection and insulation protection cover. R&D and sales.Products comply with EU environmental protection, UL flame retardant, ISO9001 management system certification requirements.