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Description of the design
High speed wire rod is one of the important products of iron and steel industry, it is widely used in infrastructure construction, building construction engineering and metal products industry. China's 1987 production of high speed wire, escalating consumption structure by strong stimulating effect and consumption market, production line building more, rapid growth in output, presented in pursuit of high speed, single equipment, no twist, micro tension, the pursuit of characteristics of high precision, high quality, etc. in the product market. At present, China has become the world's most has the high speed wire rod production line, the biggest country in the production. Continuous, high speed, no twist and controlled cooling is characteristics of high speed wire rod production, the high speed rolling process is the most important feature of. Disc material, high precision, excellent performance. High-speed no-twist finishing technology is a core technology of modern wire production, it is in the past, all kinds of wire rod mill has many problems, a comprehensive solution to product variety specification, high precision of section size, large volume and high productivity of the effective means of. The only finishing high speed can have high productivity, can solve the problem of heavy coil wire rolling process temperature drop problem. Finishing high speed rolling process without torsion, otherwise accidents, rolling cannot be carried out.
According to the graduation design task book requirements for production conditions were discussed, the design of the high-speed wire production technology, Baosteel equipment level based on 140mm, designed based on the continuous casting billet. Consideration to ensure product quality of new technology and new technology, three kinds of typical products: Phi 8mm, Phi 15mm, 20mm. This design topic and university professional course learning contents are similar, I reviewed the content and notes before class, and the school organization visited the high speed wire rod production line of Baosteel study reports, and access to a large amount of information in the library and on the Internet, the basic concept, characteristics of high speed wire rod production technology and calculation methods of knowledge points made a detailed record and learning, ready for the design work.
This paper introduces the design of process system of high speed wire rod production line in Baosteel more than three kinds of product specifications, and analyzes its feasibility and economic index calculation. In the process of system, mainly on the temperature system, pass system and speed system. The heating system temperature system is based on the blank size weight and steel making, and the cooling system according to the process. The pass system for my heavy workload, also used a lot of before I check calculation method and formula, according to the coefficient of elongation of blank size and product size, then detailed calculate three kinds of specifications product of each rolling pass size, finally draw the pass graph. Speed system is formulated according to the principle of flow equal to the known, final exit velocity and the cross-sectional area of each piece, you can calculate the rolling speed of each pass. The feasibility check, the check, the roll bite strength and motor check, respectively on the smooth bite, can guarantee the check rolling etc.. Economic index calculation, mainly in the design and production output per hour calculation, the end result for the annual output of 520000 tons.
I based on the existing equipment conditions at Baosteel and provide technical reference for the design principle, technical indicators do not allow individual equipment beyond the actual steel high-speed wire mill; according to the existing production processes and products, the production process, the formulation of rolling system, roller type system formulation, motor ability, the strength of the roller. Check, compiled calculation program of rolling force and rolling torque, using the computer software Auto CAD, to draw on the roll chart. In order to design the product in accordance with the actual production standards and production process, at the same time, according to the high speed wire rod mill of Baosteel before the survey, to understand their production of various equipment existing processes, building, location and various equipment, as a reference, and then draw out the plant design drawings to design their own products by drawing the software Auto CAD.