This paper introduces the typical high speed bar production process layout and the key equipment of high speed upper steel system The working principle has certain guiding significance to the maintenance and production organization of high-speed bar equipment.
With the development of new technology of rolling equipment, the production of bar in steel works has also bid farewell to the traditional cold-bed production of apron brake.
In this mode, the hubwheel device replaces the original cold bed bracket, and the rolling speed of the bar is rapidly increased to over 36m/s, greatly Improved the bar production line efficiency, reduced the bar rolling waste, improved the product quality, and reduced workers’ labor Intensity, while reducing energy consumption, the realization of centralized operation, economized production, for the industry’s technological progress Good demonstration and driving effect.
The high-speed bar main rolling line consists of 22 rolling mills, which are divided into roughing mill, middle rolling mill and pre-finishing mill Group and finishing mill group.Among them, roughing mill set 6, medium mill set 6, pre-finishing mill group 6, finishing mill group 4, the whole line
There are 22 rolling passes in total.The newly added high speed steel system mainly includes clamping (braking) device, servo swing rod, high speed flying shear and Hub shifting device, etc.
(1-Feeding platform :2- Heating furnace :3- Rough mill unit: 4-1# cutting shears: 5- Medium mill unit: 6- Medium mill after rolling through water device: 7-2# Crop shear: 8 – pre finishing mill group: 9 – early wear water after finishing device: 10-3 # cutting shears: 11 – finishing mill group: 12 – after finishing in water Device: 13-Clip device: 14-Servo swing rod: 15-high-speed flying shear;16- Braking device: 17- Hub steering device)
High speed steel system is applied to high speed bar production line, which can meet the requirement of high speed cold bed Double size optimization function.The system consists of clamping device before shear, servo swing rod, high-speed flying shear, brake device after shear and hub rotating device And other equipment composition.The system equipment successfully filled the domestic full continuous 36m/s high speed bar rolling system key technology Import blank.The rolling piece is clamped by the clamping device in front of the scissors to keep the steady speed forward. The flying scissors cooperate with the servo swinging rod to roll the piece The tail steel was optimized and the scale was cut.The rolled pieces after cutting twice the size enter alternately into two channels A and B, and brake after cutting The brake is applied to the tail of the rolled piece to reduce the speed of the rolled piece to 5m/s, and the rolled piece slides freely into slots A and B of the hub.
High speed clamping (braking) device
The clamping (braking) device consists of the upper and lower rollers.The clamps are mounted on a pair of cantilever shafts for easy removal Remove and replace worn roller blades.The upper and lower rollers are driven by a DC motor through gear distribution box and universal coupling. The clamping/opening of the brake roller is completed by a cylinder through the connecting rod mechanism. The upper and lower rollers move synchronously to ensure the center line Fixed.
（Outline drawing of clamp brake）
The clamping device is arranged in front of the high-speed flying shear, which is used to clamp the rolling pieces, so that the rolling pieces can be steadily transported forward with a certain tension To send.The brake device is arranged in front of A and B grooves of the cold bed to clamp the rolling piece and control the rolling piece deceleration.Gently pinch (make) The device can not only ensure the quality of the bar without defects but also set the pressure of the clamping device sensitively to send the bar to the cold bed.can Proportional valves are used to adjust the pressure according to the bar specification and surface temperature.The pneumatic system exerts enough pressure on the rod Reduce speed reliably and avoid indentation and deformation of the bar.
High speed flying shear
The high speed flying shear is arranged behind the finishing mill, with a rotary structure. The cutting edge is installed on the rotary tool holder.By a DC motor It is driven by gear.The motor shaft is equipped with an encoder for motor acceleration, deceleration and cutting edge position control.fly The shear adopts continuous working system. Each time the shear motor controls the cutting edge to accelerate and decelerate to adjust the shearing position and control Double scale accuracy.The overlap of the upper and lower cutting edges and the lateral clearance can be adjusted.To prevent shear bending of rolled pieces, The cutting speed of the cutting edge (horizontal parting speed) must be greater than or equal to the speed of rolling workpiece Slot.
（High speed flying shear profile）
High-speed flying shear consists of motor, drum type gear coupling, flying shear box body, cutting edge and disc, servo electric cylinder swing rod and outlet The composition of steel guide groove.The gear of the high-speed flying shear shaft meshed with the gear of the high-speed flying shear shaft to realize year-on-year reduction and drive The lower disk rotates in reverse to shear the workpiece.Servo electric cylinder swing rod is located in front of high speed flying shear, which can swing horizontally from side to side The machine drives the electric cylinder to push and pull the swing rod to do reciprocating motion.The electric cylinder pendulum rod works with two stations, high speed flying scissors after cutting, pendulum The rod is pushed to another station, and then the high-speed flying shear is cut again.Adjust the upper and lower cutting edges through the back gasket The amount of overlap between the upper and lower cutting edges is adjusted by the bottom gasket, and the cutting edges are pressed tightly with wedge blocks after adjustment.Out of the There are two channels, A and B, on the guide groove of the port parting steel.And if you go at different speeds The position of the dividing steel can be adjusted by the dividing steel guide plate on the channel.
Turn the hub device
The hub rotating device of the steel system on the high-speed bar is arranged at the input side of the cold bed, mainly composed of bracket, rotating mechanism, reducer and electricity Machine, etc.A hub transfer device comprises a plurality of hubs connected from end to end. A hub has a hollow shaft and a connecting end on the outside, a hollow shaft There is a water cooling channel in the middle, and the cylindrical pin with hole is connected between two adjacent hubs, and the armored metal hose is sealed and connected in the adjacent A water-cooled passage between hollow shafts of a hub and connecting adjacent hubs.Cylinder pin ends are locked by bending the cotter pin, shaft There is a margin for thermal expansion.
The two hubcaps are driven by four DC motors with two deceleration mechanisms respectively, and the hubcaps drive rotation The guide slot rotates. In order to facilitate the replacement of the guide slot, the guide slot is divided into three parts.To prevent heat change of hub mandrel and beam The bearing is lubricated by oil and gas.
Two sets of “hub-shifting” alternate actions.Each group is driven by a separate reducer and motor.It is used to transfer the rolling piece through the double length To the cold bed, two parallel hubs are suspended on the input side of the cold bed.Four feeders are evenly distributed at 90° intervals on each hub Slot.When the hub is rotated 90°, the rolled piece falls into the cold bed from the hub, and at the same time arrives at the position ready for steel connection, waiting for the next inch rolled piece Enter the hub.Rolling pieces are transferred to two hubs in turn during operation.Hub blanking channel sequence is A1, B1, A2, B2, A3, B3, A4, B4 and then the next cycle A1, B1…
The high-speed upper steel rolling system can increase the bar rolling speed from 18m/s to 36m/s. The application of this technology can make (10 ~ 20mm) specification output up to 120t/h.The stepping cycle of the cold bed and the bar positioning system are precisely synchronized to ensure that each groove is only down A steel.Reliable rolling count reduces the labor intensity of the rolling line operators.High speed bar production line operator Personnel are able to obtain the best product dimensional tolerances and optimum bar lengths, as well as for production management and equipment maintenance It’s convenient.
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