PQF (Premium Quality Finishing) is a high-quality seamless steel pipe rolling mill for finished pipes. It is currently the most advanced limited core rod rolling mill in the world. It uses a three roll stand, overcomes the shortcomings of traditional two roll stands, and has better hole closure, representing the highest level of hot-rolled pipe production today.
customer demand
The continuous rolling mill with a diameter of 177PQF at Ansteel Seamless Plant was put into operation in 2007, with an annual production capacity of 200000 tons and product specifications of 73-180mm * 5-16mm.
The unit originally used an international brand of feedback rectification and high-power inverter for transmission. The rolling mill consists of five sets of transmissions, including 15 rolling mills, 4 limit motors, 4 tube release motors, and 3 VRS motors. This test machine replaces the # 2 group with the highest rolling load and three 600kW motors. The original inverter specification is 11K7, with a heavy-duty power of 1060kW and 1100A; Controlled by PLC through Profibus DP.
Due to the upgrading and renovation of the 177 production line, the requirements for the continuous rolling mill have been further increased. It is required to be able to roll special steel with thinner wall thickness and harder material, and to pass the steel quickly. The original transmission cannot meet the technical requirements, and due to its long service life, it faces difficulties in supplying spare parts. Therefore, Ansteel has decided to replace the original equipment with the following requirements:
Profibus Dp bus communication control can be used, seamlessly replacing the original transmission, and customers do not need to change the program
Meet the requirements of PQF continuous rolling mill for dynamic speed drop of steel rolling, including speed accuracy, speed fluctuation, torque accuracy, torque response, etc
The PG free vector control of the transmission must meet the technical requirements of steel rolling and ensure the continuity of production
Envision solution
Based on the comprehensive product performance, on-site solution, on-site service, and price, Ansteel ultimately chose to use the Yingweiteng GD880 multi drive frequency converter to seamlessly replace the original product.
Considering the first use of domestically produced equipment, Yingweiteng has expanded the selection of heavy loads for Ansteel to 1500kW, with models GD880-56-2052-6 and three GD880-51-0720-6 power units in parallel.
Cabinet layout diagram
Customer value
Through GD880’s free programming function, it seamlessly replaces imported brands without the need for users to modify PLC programs, making debugging quick and convenient
Free programming
After replacement, it meets the speed reduction step of the continuous rolling mill, with stable speed and high finished product quality. It can not only roll special steel that cannot be rolled by the original brand, but also meet the speed increase requirements of the 177 production line upgrade, improve the production efficiency of the user’s continuous rolling mill, and achieve cost reduction and efficiency increase
No PG vector control is required for steel passing, stable control, and can be maintained without stopping the machine even if the encoder is damaged
Control waveform
Compared to the original brand, the size of the transmission cabinet is reduced and the power is increased, allowing for reduced operation in case of faults
Power unit quick insertion, easy maintenance, and traceable fault records
With the increasingly mature technology and services of domestic frequency converters, domestic substitution has become a major trend in steel enterprises. Relying on its own technological advantages and experience accumulation, Yingweiteng will continue to move forward on the path of localization, making breakthroughs in key projects of major clients such as Baowu and Anben. In the future, Yingweiteng will continue to make progress, promote the replication and promotion of product solutions in the metallurgical industry, build a new digital business development model, and help the metallurgical industry gain new momentum.
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