The invention discloses a fixed-width press plate blank width control method, and belongs to the technical field of steel rolling automatic control. During the process of laterally rolling the head and the tail of a plate blank by a fixed-width press, the head part and the tail part of the plate blank are in plane stress states; according to the metal flow principle of the head part and the tail part of the plate blank, and tongue and fishtail phenomena can be generated. In order to improve the condition, the widths of the head and the tail of the plate blank are controlled in short stroke by adopting the fixed-width press; under the working condition that stripe steel rolling temperature and rolling cycle are ensured, the severe width failure of the head and the tail of the stripe steel can be improved, and the final rolling target width index is ensured effectively; a pass band guarantees the width index deviation range to be 0-8mm, the yield is improved, and the production cost is saved; and when the plate blank is pressed greatly, similar to the small lateral pressing amount, the outlet width is obtained through pressing one time, the rolling temperature of the stripe steel is ensured, and the rolling cycle is improved.

Fixed-width press plate blank width control method

The invention discloses a method for improving coiling temperature control accuracy of hot rolled new-variety new-specification band steel and belongs to the field of control. The method includes that an on-site control computer dynamically controls production running parameters of production equipment in a hot rolling laminar flow cooling process according to a coiling temperature control model, a released product task and production process indicators; key production process information like band steel type, target thickness, target coiling temperature, rolling speed and band steel cooling mode are combined in a hot rolling laminar flow cooling control process; whether incoming materials from a previous process belong to new variety or new specification or not in a current process is automatically judged; model parameters of the new variety or the new specification in the current process during first-time production are automatically determined through a series of presumption logic so as to improve coiling temperature control accuracy and control qualification rate during first-time production of the band steel of the steel type or the new specification by the current process and lower 'waste, defective and downgraded rate in the process of first-time production to lower product manufacturing cost. The method can be widely used for the field of control on the hot rolling laminar flow cooling process.

Method for improving coiling temperature control accuracy of hot rolled new-variety new-specification band steel

Control and modifying unit of scale of hot rolling strip steel

The invention discloses a stepped hot rolled strip production line laminar flow cooling control method. The method comprises the following steps: I, setting the temperature of the head of strip steel: calculating temperature to be cooled of the head of the strip steel by a laminar flow cooling control model through rolling temperature, stepped cooling compensation temperature and strip steel head finish rolling temperature; II, setting a strip steel head cooling scheme: calculating cooling water quantity of the laminar flow of the head of the strip steel by the laminar flow cooling control model according to the temperature to be cooled of the head of the strip steel and the speed of the strip steel, and then determining the cooling water nozzle distribution of the laminar flow according to a cooling strategy in the laminar flow cooling control model; III, setting the temperature of the tail part in the strip steel: calculating the temperature to be cooled of the tail part in the strip steel by the laminar flow cooling control model through the finish rolling temperature of the tail part in the strip steel; IV, setting the cooling scheme of the tail part in the strip steel. The method has the characteristics that the turn-up of the head of the strip steel on a track is prevented and folding and unwinding are prevented from occurring on the inner ring of a steel coil, and can be widely applied to the field of production of hot rolled strips.

Stepped hot rolled strip production line laminar flow cooling control method

The invention relates to the field of steel rolling automatic control, in particular to a control method for a wedge-shaped base width According to the control method for the wedge-shaped base width based on the fixed-width side pressure machine, a wedge-shaped base is divided into three sections based on a width change rule, the dog-bone broad-sidings of a head equal-width section and a tail equal-width section are respectively calculated to be used for correcting the rolling reduction, then the stepped number and the stepped size are calculated and obtained according to the rolling reduction after correction, and finally, each stepped rolling reduction of a widened section is calculated and obtained through inserting a value According to the positional information of the wedge-shaped base width included in a rolling schedule issued by an upper computer and the slab actual shape actually measured by a stokehole width gauge, combined with the conditions of the flapping module shape of the fixed-width side pressure machine, the running speed of a roller bed and the like, by adopting gradually progressive and variable-rolling-reduction and variable-step-size control methods, the uniformity of the width of the total length of the wedge-shaped base which is rolled by the fixed-width side pressure machine is ensured, the width fluctuation of the total length of the wedge-shaped base is effectively reduced, and the rolling stability and the finishing product rate are improved

Control method for wedge-shaped base width based on fixed-width side pressure machine

The invention provides a free cooling method of hot rolling band steel, which featured in that temperature testing devices and induction feedback devices are arranged respectively at the fine rolling outlet, the coiling inlet and the laminar flow cooling roller way acting as the middle portion of the cooling device; the temperature of the laminar flow cooling water in the three sections are adjusted and controlled after the coiling temperature difference of the head and tail of the band steel and the middle portion of the band steel is tested and fed back. Therefore, the method of the invention can not only control the head and tail temperature of the band steel freely, but also control the length of the head and tail of the band steel freely.

Free cooling method of hot rolling band steel

The invention discloses a method for controlling the large lateral pressure of a plate blank, which comprises the following steps that: 1) the rolling reduction of a large lateral pressure machine, an initial depressing position Lh and the depressing frequency n are calculated; 2) after the plant blank enters the large lateral pressure machine, the head part of the plate blank is sent to the initial depressing position Lh; 3) the plate bank is not moved at the initial depressing position Lh, and the large lateral pressure machine is depressed for n times; 4) after the head part of the plate blank is depressed for several times, the plate blank moves forwards and is rolled in a normal way Compared with the prior art, the method has the following advantages that: the width of the head part of the plate blank is controlled by a model; a multi-time lateral pressing method is used to replace the prior one-time lateral pressing, and the capacity of controlling the width of the head part by rolling lines is improved greatly; and the average width deviation of the head part and the middle part is +/-5mm, the phenomenon that the head part with the finish rolling outlet width is negative is prevented, and the width blocking rate is reduced effectively

Method for controlling large lateral pressure of plate blank

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Free cooling method of hot rolling band steel

Method for controlling large lateral pressure of plate blank