JPS58202954A - Horizontal continuous casting method - Google Patents

Abstract

PURPOSE:To form a surface having high quality and an internal solidified shell having no defects by changing the drawing stroke and return stroke of a casting respectively in specific units, specifying the cycle time thereof and inserting a specific pause time between both stroke. CONSTITUTION:A casting 1 is clamped with the clamping jaws 9 of clamping arms 8 and the jasw are operated by differential cylinders 10. Clamping devices 3 are placed on a carrier 5 and are connected to the rods 12a of piston cylinder units 12. The drawing stroke for the casting is changed in a 1mm. unit, and the return stroke is changed in a 0.1mm. unit. The cycle time thereof is set within a<=1sec range. A 0-10sec pause time is further inserted between the drawing stroke and the return stroke. The cylinders 10 and servocontrol valves 13 are connected respectively to an electronic controller 22, by which both are controlled.

Description

[Detailed description of the invention] The invention allows the casting to be gradually withdrawn and then returned.

Wait, is there a pulling stroke at this time? This invention relates to a method for horizontal continuous casting of metals, especially steels, in which the return stroke is larger than the return stroke.

This method involves extrusion of the casting from a horizontal continuous casting mold, in contrast to straight plow or arch casting, in which the extrusion of the casting is assisted partly by electric power and partly by the vibration of a vertical continuous mold. Performed to assist in extrusion of castings. In horizontal continuous casting of steel, there is a serious problem in that scratches that cannot be seen from the outside remain on the solidified shell inside the casting. Apart from external abnormalities, internal cracks and cavities must be avoided. It is known (CH 44.9622) to grip the casting by a pair of clamping devices and to move it continuously or stepwise. This known method moves the casting with sufficiently small strokes, but as many strokes as possible per unit time. That is, the casting is moved one or several strokes without loosening the clamping device, then gripped by another clamping device and moved one or several strokes without loosening this clamping device, while the first clamping device is This is accomplished by removing the clamping device from the casting and returning it to its initial position, gripping the casting again, and simultaneously removing the other clamping device from the casting and returning it to its initial position. .

However, the above methods merely hold or move the forged object in stages.

It is not enough to pull out the casting intermittently and hold it still at each interval, and the steel horizontal chain M! In straight casting, it is necessary to provide a return stroke in order to produce a good solidified shell inside the casting. The above-mentioned known methods strive to perform as many strokes per unit time as possible with sufficiently small strokes, but they do not take into account the necessary crystallization time.
Not suitable for crystal fast casting. The extraction device used in the above method is a rounding, f
There is a drawback that the fc stroke is not performed accurately. The method of actuating some clamping devices is not sufficient to accommodate the play occurring in the circuits of the hydraulic system. Based on the current shortcomings of this technology, which simultaneously impair the stability of the system in parallel connected extraction circuits, the i1N problem of the present invention is to apply a precise KW with a certain smallest stroke in the smallest period. as well as coarse precision control elements, in order to reduce the total flexibility or play present in the system by a factor of about 10;
The objective is to improve operating equipment, cylinders with normal airtightness, piping, limit switches, etc.

That is, the present invention provides a horizontal continuous casting method in which a casting is gradually withdrawn and then returned, and in this case, the withdrawal stroke is made larger than the return stroke, in which the withdrawal stroke is varied in units of lsm, and the return stroke is
The cycle time is changed in units of 1 second or less, and the change in the pull-out stroke and the return stroke or the change in the return stroke and the pull-out stroke is performed.
This horizontal continuous casting method is characterized in that the drawing stroke and the return stroke are vibrated with different amplitude sections, with a pause time of 10 seconds inserted from the start.

According to such a method, a high-quality surface is neglected because the necessary minute movements are performed in a short time, and α1f is
Since the Wb stroke is set in i units and a rest time of 0 to 10 seconds is inserted between the withdrawal stroke and the return stroke, no defects will occur in the solidified shell inside the casting.

The rounding and drawing device implementing the above method comprises a clamping device movable along at least one casting-drawing direction. In order to solve the device technical problems, the clamping device is arranged on a carrier that is movable along the casting-drawing direction and connects a piston cylinder unit with a servo valve directly to the carrier and connects this servo valve directly to the carrier. It is proposed that the valve be actuated by a programmable control device. This extraction device does not use the above-mentioned coarse control elements and actuating devices such as cam switches acting on the switching valve, the usual airtight cylinders, piping, limit switches, etc., and also does not require the use of Some great flexibility and/or undesirable play can be avoided. This drawing device provides the necessary stability and reliability of movement for favorable quality, resulting in values that are an order of magnitude lower than those obtained with known drawing devices. Furthermore, it is advantageous that short cycle times are achieved with this drawing device. In this design of the extraction device, the piston-cylinder unit is operated via a hydraulic circuit to which an accumulator is connected. As a result, K is
It is possible to always supply a larger amount of oil than is required.

First, the clamping device is actuated by a differential cylinder, which makes it easier to identify the lever. Furthermore, in the above configuration, the servo valve is electronically controlled.
Parameters (horizontal continuous casting process units) that can be set with equipment K are composed of switching valves that are controlled in synchronization.

Hereinafter, one embodiment of the present invention will be described based on the drawings. The drawings show a schematic configuration of a wave pulling device for carrying out the method according to the present invention, and also show a hydraulic circuit and its electrical control system. Casting (1) made of steel is a horizontal casting mold (not shown)
and move from left to right on a loaf table (not shown).

Then, the casting is cut into a predetermined length by a cutting cap (not shown). In addition to the loaf tape μ, the cast material (1
) parallel to the pulling direction (2) of the clamping device (3) (3)
A guide rail /l/(4) is provided. The clamping devices (3) are each mounted on a carrier (5), and the carrier (5) has a trolley structure.

Therefore, the wheels (6) of the carrier (5) are guided by the guide rail 1v (
4) Move above. The guide rail, /L/ (4) is the cover (
(not shown), which is fixed to the carrier (5) and serves to protect the relatively precise guide rail A/(4) from dust. Each carrier (5) has a pair of clamp arms (8) which are swingable around a shaft (7) parallel to the drawing direction (2) of the casting (1); Arm (8) K 11 Kufunfushiji (9) is fixed. Each of the above-mentioned Kufun digicos (9) is operated by a differential cylinder a1. In addition, the above carrier (5
) is directly connected to the servo unit (5) and the piston rod (12a) of the piston/cylinder unit (a). The servo valve (to) controls the piston cylinder unit 04 with desired sensitivity and accuracy. Note that there is no play between the carrier (5) and the piston rod (12a). Carrier (5) and clamping gear = J - (9) (or the differential cylinder αQ is connected to the hydraulic electronic control unit Q4. That is, the motor (to) drives the pump Q to pump pressure oil from the tank αη. The pressure oil is sent to the accuflator α through the safety block.If high pressure exceeding the allowable limit (high pressure is expected during operation) occurs, the safety valve opens and the pressure oil is transferred to the tank (rotor). ), the accumulator QIK is connected to the servo valve 03 via the piping, and also to the differential cylinder Q□QQ.The above differential cylinders αQ are each connected to the control valve (2). The above hydraulic circuit applies high pressure to the servo valve (to) and □ control valve ■. The servo valve (to) and control valve
Control of the control valve (2) is carried out by a freely programmable electronic control device (2). This electronic control equipment (2) is connected to the control valve 3υ (
2), and also via the electrical wiring @(E) to the Surho valve (2).
(to) respectively.

The method of operation is carried out on the basis of the above-described pulling device which operates in an inflexible and play-free manner, for example by the cycle described below.

α following a pull-out stroke in the range of 1m to 99m
After a pause of 3 seconds, there is a return stroke of, for example, 23 kats. After that, a pause time of α5 seconds is inserted again. The same process is automatically repeated by a predetermined program. In addition, in the figure, the drawing stroke (a
The end positions of the t and xb strokes lbl are each shown by phantom lines. Further, in the above control method, from O to 1
If the stop time up to 0 seconds is set in units of α01 seconds, good results will be obtained for # general generation inside the casting. Furthermore, setting the clamping device to be greater than the withdrawal stroke or retraction stroke time ensures the fixation of the position once occupied by the casting, ensuring evenly spaced addition of fgm within the horizontal continuous casting mold. I can do it.

According to the above method, a high-quality surface can be obtained because the necessary minute movements are performed in a short time, and the minimum range of the drawing stroke is set in units of αl with a cycle of a fraction of a second. Since a resting stroke of 0 to 10 seconds is inserted between the drawing stroke and the returning stroke, no defects occur in the solidified shell inside the casting.

[Brief explanation of the drawing]

The drawings are diagrams showing a schematic configuration of an embodiment of the present invention.

Claims (1)

[Claims] 1. In a horizontal continuous casting method in which the casting is gradually pulled out and then returned, and in this case the pulling stroke is made larger than the return stroke, the pulling stroke is changed in 1 m increments, and the draining stroke is changed in 0.1 m increments. The cycle time is varied and the cycle time is in the range of 1" seconds or more, and the cycle time is between 0 and 10 seconds between the pull-out stroke and the pull-out stroke or between the armpit stroke and the pull-out stroke.
A horizontal continuous casting method characterized in that a withdrawal stroke and a return stroke are vibrated with different amplitude divisions with a pause time of seconds.