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Purpose of the automated position control system for the screw-down structure of vertical rolls of the slabbing mill (ACS "APCS VRSDS") is to ensure automated control over the width of the rolled slabs to obtain minimal scrap edges during subsequent transit rolling of the obtained slabs on the hot wide-strip mill. 

To obtain high mechanical properties of sheet products, hot rolling mills are equipped with controlled water cooling units (CCU). Such units usually include a large number of sections, located above and under the stock in the direction of its movement. Laminar cooling units became especially popular on plate and strip mills.

The main task of the CCU is to ensure the stock cooling at a specified speed down to the specified temperature without its buckling. Modern requirements to the temperature control accuracy and to its stability along the stock length can be satisfied only through automatic control over the CCU operation.

 

 

RPC «Donix» developed an electronic system of control over the high-speed wire mill blocks setup (ESCB), including control over the rolling mill kinematic parameters and monitoring of the entry guide rollers operation. The system is based on the measurement of angular speeds of the block entry guide rollers.

Independent electronic system ESCB ensures the following control functions:

  • the pre-emergency condition of the rollers' bearings is monitored by speed graphs;
  • the roller jamming is detected;
  • the compliance of the gaps setup in the roller guides with the roll gaps setup in the stands is checked;
  • the kinematic conditions of the block operation are controlled.

 

 

Fuel rate reduction is obtained due to the reduction of the overall air consumption coefficient of the furnace down to the values not exceeding 1,1. Its values in the welding zone are significantly lower (down to 1,04). As a result the oxidizing ability of the furnace gases in the working space of the furnace decreases which leads to the reduction of the metal waste.

That is confirmed by experimental investigations of the metal waste carried out by the heating engineering laboratory of the rolling plant on scale samples taken the billet surface at the exit the furnace, as well as by significant reduction of scale accumulation on the heating furnace bottom.

 

 

The system's purpose is to ensure automated control over the process of ingots heating in the soaking pits of roughing mills, as well as to provide the operational and technological staff with proper information. 

The system's main functions are:

  • to calculate the rational plan of the workpiece cutting into slabs;
  • to carry out contactless measurement of slab lengths;
  • to calculate the slab weight;
  • to identify the slabs and to assign unique codes to them; the code contains heat number, workpiece (ingot) number, number of the slab obtained the workpiece;
  • to generate information data base.

 

 

The automated control system sorts out slabs (blooms), which are sent to transit rolling, according to the power consumption for metal deformation per rolling cycle, in order to achieve energy savings and increase the process safety.

The system ensures rational workpiece cutting on the shears and keeps automatic record of the quality metal weight in the roughing mill.

The system's main functions are:

  • to generate a rational plan of the workpiece cutting into slabs;
  • to determine the position of the front end of the workpiece relative to the shears cutting line in the process of the workpiece positioning before cutting the slabs (blooms) and to determine the slab (bloom) length at the moment of cutting;
  • to carry out automatic measurement of cross-sectional dimensions (width and thickness) of slabs (blooms) in the processing line of a rolling mill;
  • to calculate the weight of the slabs (blooms) to be cut;
  • to visualize the results of the slab length, width and thickness measurement, the rational workpiece cutting plan and process data;
  • to record the results of the length measurement and slabs (blooms) weight calculation;
  • self-diagnostics of the system operation

 

 

Continuous rolling mills are main suppliers of finished products of the metallurgical industry. To satisfy the requirements of the market, the range of their products must be as wide as possible within the processing capabilities. This requires frequent mill set-up and complicates preproduction process. Application of modern hardware allows to introduce automation into the roll pass design and mill set-up processes.

Engineers of RPC "Donix" developed and introduced into commercial operation an automated tracking system for the production process on the continuous rolling mill 250 in Queenborough (Great Britain).

 

 

Field of application: duo reversing mills.

Purpose: to improve maintainability of rolling stands equipment due to prevention of unstable and emergency schedules; to reduce downtimes.

System components: distributed data acquisition system (electric, hydraulic and temperature parameters of equipment operation), central control cabinet, workstations for data processing and reports generation.

 

 

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