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A kind of preparation method of special-shaped brass tube
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A brass tube and special-shaped technology, which is applied in the field of special-shaped brass tube preparation, can solve problems such as high cost and complicated processing, and achieve the effect of improving work efficiency and reducing costs
Active Publication Date: 2020-01-10
周达义
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[0016] The present invention will be described in detail below in conjunction with examples.
[0017] The processing process of the product of the present invention is as follows: batching → smelting → pre-furnace analysis → semi-continuous ingot casting → semi-finished product → heating annealing (630 ° C) → extrusion (adjustment of eccentricity) → stretching (calculation of processing rate and adding lubricating oil) → Annealing (annealing time, temperature, holding time) → finished product.
[0018] Ingredients: choose brass rod Chemical composition: copper (Cu) 57.0 ~ 59.0; lead (Pb) 2.5 ~ 3.5; aluminum (Al) <0.05; iron (Fe) <0.3; nickel (Ni) <0.3; lead (Pb) 2.5~3.5; aluminum (Al) <0.05; iron (Fe) <0.3; silicon (Si) <0.3; zinc (Zn) balance. Specifications 1.0-120mm.
[0019] Melting: Melting with intermediate frequency melting furnace. Baking temperature, flame spraying (1030~1100°C), covered with charcoal or rice bran after baking, the order of feeding and melting is c...
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Abstract
The invention discloses a preparing method of a special-shaped brass tube, and relates to copper pipe preparing methods. The method comprises the steps of burdening, smelting, ladle analysis, semi-continuous ingot casting, semi-finished product operation, heating annealing, extrusion, annealing and finished product operation. Through the stretching method, metal structure crystallization is changed, a tube is made through direct pulling, in the machining process, the heat machining temperature is 630 DEG C, before extrusion, the eccentricity is adjusted, during stretching, the machining rate is calculated, the lubricating means is adopted, during annealing, the accurate annealing temperature, time and heat preservation time can be accurately determined, through improvement of the pressureresistance, stretching and annealing technology, the European Union standard is met, the domestic blank is filled up, and the product achieves the parameters that the percentage elongation(%) is larger than or equal to 15, the tensile strength (MPa) is larger than or equal to 485, and the hardness ranges from 120 to 155.
Description
technical field [0001] The invention relates to a method for preparing a copper tube, in particular to a method for preparing a special-shaped brass tube. Background technique [0002] Most of the connecting pipes used in automobiles and other oil circuits, steam circuits, and water circuits are brass pipes. Brass is a preferred material because of its good physical properties. The processing is relatively simple, the efficiency is low, the product cost is high, and the processing quality of the product is not easy to grasp. [0003] The old processing process is: batching→melting→semi-continuous ingot casting→semi-finished product→heating annealing→extrusion→stretching→annealing→finished product. The prepared brass tubes do not meet EU standards. Elongation δ (%) ≥ 10, tensile strength (MPa) ≥ 410. The thermal processing temperature during processing is 730-820°C, and the annealing temperature is 600-670°C. The processing is complicated and the cost is high. Contents ...
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