JPS6257740A - Method and device for discontinuously drawing steel casted piece - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for discontinuously drawing a steel slab from a mold, in particular from a horizontal mold. The steel slab is drawn from the mold by drive rollers driven using hydraulically actuated motors. The invention also relates to an apparatus for implementing such a method.

[Prior art and its problems] As a method of this type, there is a method well known from DE-B-1783032. According to the method of DE-B-1783032, in order to obtain periodic oscillation of the rotor of the hydraulically operated motor in response to the steel slab drawing operation, in order to supply pressure fluid to the hydraulically operated motor. An operating valve is provided. This valve provides periodicity in the amount supplied to the hydraulically operated motor. This operating valve is
For this purpose, the pressure fluid introduction conduit is more or less opened and closed.

This method has the disadvantage that the throttling causes efficiency losses in the operating valve and heats up the pressure fluid. Furthermore, in order to ensure sufficiently accurate discontinuous rotation of the rotor of a hydraulically actuated motor, an expensive device must be provided to control the flow of the pressurized fluid out of the actuating valve, and is nevertheless unstable. There is also the drawback that it is possible.

Special measures must be taken to avoid this instability.

The device known from DE-B-178.3032 is an actuated valve, which limits the pipe size and can only be installed in a steel slab casting machine for casting steel slabs with a small cross section. It is.

[Problems of the Invention] The present invention aims to avoid these drawbacks and difficulties, and attempts to accomplish the following tasks. That is, the object is to complete a method for discontinuous drawing of steel slabs and an apparatus for implementing this method. Here, there is no limit to the size of the conduit, and there are no losses in the conduit or in the hydraulically actuated motor. It is also possible to provide a self-contained regulating circuit in spite of sufficient precision in the drawing of the steel billet.

These problems are solved by the present invention as follows.

That is, the inlet side of the fluid pressure operated motor is supplied with a constant flow rate per unit time, while the other side is supplied with pressure fluid, the flow rate of which changes periodically at least in a certain time unit, or It gets sucked in.

In order to avoid energy losses, in particular, depending on the supply and suction of the flow on the inlet side of the hydraulically operated motor, on the outlet side the pressure fluid is suctioned and supplied with a flow rate that varies periodically at least over a certain period of time. will be carried out.

The apparatus for carrying out this method has the following characteristics. That is, one of the pair of opposing rollers in contact with both the upper and lower surfaces of the steel slab is at least capable of applying pressure to the surface of the steel slab, and the other is at least a drive roller that can be driven via a hydraulically actuated motor. It becomes. Here, the fluid pressure operated motor is connected to a main fluid pressure pump which continuously sends a constant flow rate through a main fluid pressure introduction pipe. A conduit is used on the inlet side of the fluid pressure operated motor.
A secondary hydraulic conduit is connected to the hydraulically actuated motor, which is also connected to a secondary hydraulic pump that periodically delivers pressurized fluid. This sub-hydraulic pump is driven at a period corresponding to the period of discontinuous drawing of the steel slab.

In particular, this auxiliary fluid pressure pump has a piston pump structure that can compress and suck fluid on both sides, and the −° chamber of this auxiliary fluid pressure pump is located on the inlet side of the fluid pressure operated motor.
The other chamber is connected to the outlet side by a conduit.

One preferable example of the structure is as follows. That is, the main fluid pressure pump is connected to the auxiliary fluid pressure pump via a transmission gear, especially a transmission gear that includes a transmission, and both the main fluid pressure pump and the auxiliary fluid pressure pump can be driven by a common motor. It is something.

In order to avoid creating a restriction in the conduit carrying the pressure fluid, the main fluid pressure pump is connected to another fluid pressure operated motor which is relayed by a connecting shaft, the outlet of this separate fluid pressure operated motor being connected to the main flow fluid pressure pump. It is connected to the inlet of the body pressure pump with a conduit.

At least one suitable sub-fluid pressure so that the steel slab can be drawn in a further variety of motion modes, i.e., in a motion mode combined with two or more kinds of sinusoidal vibrations. Equipped with a pump. This auxiliary fluid pressure pump is connected to the inlet side of the fluid pressure operated motor through a conduit, and is driven at a frequency corresponding to an integral multiple of the frequency of discontinuous drawing of the steel billet.

[Example] Next, an example of the present invention will be described in detail using the drawings. 1st
The figure illustrates a device according to the invention for a horizontal mold, schematically depicted in a perspective view.

FIG. 2 depicts further structural details in a similar representation to FIG. In FIGS. 3 and 4, the desired drawing movement for a steel billet is illustrated in diagram form. Here, the horizontal axis shows time, and the vertical axis shows the velocity of the steel slab and the flow rate of the pressure fluid.

1 is a fixed storage container for receiving molten steel, and its lower end is equipped with an outflow portion 2 that projects laterally. A mold 3 (hereinafter simply referred to as a horizontal mold) for drawing out the steel slab in the horizontal direction, which is similarly fixed while the molten steel is being poured, is tightly connected to the outflow portion 2.

In the example construction shown here, the mold cavity has a rectangular cross section.

The steel slab 4 with a rectangular cross section that has come out of the horizontal mold 3 is
It is supported in the drawing direction 5 along a roller path 7 equipped with support rollers 6 . A drive coupling mechanism (drive device) 9 is provided 7 at a certain distance 8 from the horizontal mold 3.
At this point, the distance between the rails 8 and 8 must be sufficient to allow the steel slab to solidify while running over it. This drive mechanism 9 is composed of a non-drivable roller 11 arranged to press the surface 10 of the steel slab, and a drivable roller 2 whose position is fixed, and these rollers 11.
12 are in contact with the surface lO of the steel slab 4 in a facing manner. In order for the non-driven roller 11 to press the surface IO of the steel slab, a press device 1, which is schematically shown in the figure, is used.
3 is used. This press device 13 is composed of, for example, a compression cylinder or a spring back device, and is also equipped with a fluid pressure operated motor 14 for driving the drive roller [2]. Pressure fluid is led from the pressure fluid reservoir 15 through the main pressure fluid inlet conduit I6 to the hydraulically operated motor using the main fluid pressure pump 17. This main fluid pressure pump 1
7 is driven by an electric motor 18. A separate hydraulic motor 20 is provided in the main pressure fluid outlet conduit 19 leading from the hydraulic motor 14 to the pressure fluid reservoir 15 . This fluid pressure operated motor is connected to the main fluid pressure pump 17 via a connecting shaft 20°, and rotates in synchronization with this. This additional hydraulically actuated motor 20 replaces the throttle that is customarily provided in the pressure fluid circuit and operates with very low energy losses compared to this throttle.

The electric motor 18 that drives the main fluid pressure pump 17 also drives the auxiliary fluid pressure pump 25 . That is, the transmission 21
Under the intermediate switch, the crank 22 is driven, and its connecting rod 23 drives the piston rod 24 of the hydraulic cylinder 25 (cylinder that works on both sides in the same way) that works on both the left and right sides. Of the two chambers 26 , 27 of the hydraulic cylinder 25 , chamber 26 is connected to the pressure fluid inlet conduit 16 and chamber 27 is connected to the pressure fluid outlet conduit 19 .

That is, the pressure fluid auxiliary conduit 28.29 emerging from the chamber 25.26 of the hydraulic cylinder 25 is connected between the pump 17 and the hydraulic motor 14, or between the hydraulic motor 14 and the current fluid pressure. It is connected to a pressure fluid inlet conduit or a pressure fluid outlet conduit between the operating motors 20.

Working of the device: In order to achieve the periodically vibrating movement of the steel slab from the mold 3 whose position is fixed, as shown by the solid line in Fig. 3,
The fluid pressure operated motor 14 is supplied with pressure fluid at a flow rate Q from the inlet side. This flow is provided by a main hydraulic pump 17 and a secondary hydraulic pump, ie a hydraulically operated cylinder 25 which operates on both sides. The main fluid pressure pump supplies a constant flow IQ' per unit time, as shown by the dashed line in FIG.

A hydraulically actuated cylinder 25 operating on both sides is connected to the crank 2
2 and a periodic flow rate Q'' corresponding to the transmission of the transmission 21 is supplied or withdrawn from the introduction conduit 16 depending on the direction of movement of the piston 30 of the hydraulic cylinder 25.

The flow rate Q'' supplied or drawn from the fluid pressure operated cylinder 25 is shown by a dashed line in FIG. Q of pressure fluid is supplied.This flow rate Q is determined by the rotational movement of the drive roller proportional to the amount or by the periodic movement of the steel slab 4 depending on the transformation of the fluid pressure operated motor 14. Produces a pulling motion υ([).

With respect to the flow rate Q'' of the pressure fluid supplied or withdrawn through the auxiliary hydraulic conduit 28 and the flow rate Q'' of the pressure fluid withdrawn or supplied through the auxiliary hydraulic conduit 29, there are no Since it behaves in the opposite way, the result is that the hydraulically operated cylinder 25
After the inflow from the auxiliary fluid pressure conduit 29 connecting the chamber 27 and the main fluid pressure derivation conduit 19, the main fluid pressure derivation conduit 19
A constant amount of pressure fluid flows per unit time.

For complex drawing movements of the steel billet 4, depending on the expansion of the periodic function into a Fourier series, further hydraulically actuated cylinders 25, which act on both sides, are additionally actuated in parallel with the hydraulically actuated cylinders 25, which act on both sides. That is, it is also possible to provide a separate auxiliary fluid pressure pump. The crank of this separate cylinder is driven with a certain period, and this period is determined by the continuous withdrawal of the steel billet 4 m rFI 1+TI M k fJt /vertical? -U÷1iLjl 'fhl )t;'t)t
Another hydraulically actuated cylinder 31 with t'+ Qf- is shown in dotted lines in FIG. This hydraulic cylinder 31 is driven via a transmission 32 of the shaft 33 of the crank 22 which drives the first hydraulic cylinder 25 .

In this way, it becomes possible to realize the drawing movement υ of the steel slab 4 as shown in FIG.

Here, the accuracy of the correspondence between the actual steel billet withdrawal motion υ and the intended steel billet withdrawal motion depends on the selection of the number of hydraulically actuated cylinders.

FIG. 2 shows the mode of operation of a double-sided hydraulically actuated cylinder when a cam disk 34 is used instead of the crank 22. By selecting the cam surfaces of the cam disk 34 that actuates the piston 30 of the cylinder 25 that operates on both sides, the drawing movement of the steel slab 4 can be easily and precisely achieved as shown in FIG. 4. It can be matched with exercise.

[Brief explanation of drawings]

FIG. 1 illustrates an apparatus according to the invention of a horizontal mold reservoir, schematically depicted in perspective view. Figure 2 shows the first
A similar representation to the figure depicts additional structural details. In FIGS. 3 and 4, the desired drawing movement for a steel billet is illustrated in diagram form. Here, the horizontal axis shows time, and the vertical axis shows the velocity of the steel slab and the protozoa of the pressure fluid. 3...Horizontal mold, 4...Steel slab-11...Press roller, 12...Drive roller, 14...Fluid pressure operation motor, 16...Main fluid pressure introduction conduit, 17... Main fluid pressure pump, 25 Sub fluid pressure pump 28 Sub fluid pressure conduit. Patent Applicant Hoestor Albin Akchengesellschaft Agent Patent Attorney Two Idiots FIG, 1

Claims (7)

[Claims] (1) The steel slab (4) is drawn from the casting mold (3), in particular a horizontal casting mold, in which the steel slab (4) is drawn via drive rollers driven by at least a hydraulically actuated motor (14). From (3), in the discontinuous drawing method, pressure fluid is poured into the inlet side of the fluid pressure operated motor (14) at a constant flow rate Q' per unit time on one side, and on the other side. A method for discontinuously drawing out a steel slab, characterized in that a pressure fluid of a flow rate Q'' that periodically vibrates at least in a certain time unit is supplied or drawn out. (2) In the method according to claim 1, at the outlet side of the fluid pressure operated motor (14), at least the A method characterized in that a flow rate @Q@'' that periodically oscillates in a certain time unit is drawn or supplied. (3) An apparatus for carrying out the method according to claim 1 or 2, wherein one (11) is capable of applying pressure at least to the surface of a steel slab, and the other (12) is capable of applying pressure to the surface of a steel slab.
) facing each other having the function of drive rollers driven at least via a hydraulically actuated motor (14);
The fluid pressure operated motor (14) has at least one pair of rollers (11, 12) in contact with opposite surfaces (10) of the steel slab (4), and the fluid pressure operated motor (14) has a main fluid pressure introduction conduit (16); It is connected to a main fluid pressure pump that maintains a constant supply, and further, an auxiliary fluid pressure conduit (28) is connected to the fluid pressure operated motor (14) in a conductive manner on the inlet side of the fluid pressure operated motor. This secondary fluid pressure conduit is connected to a secondary fluid pressure pump (25) that periodically sends out pressurized fluid,
This auxiliary fluid pressure pump is a device characterized in that it is driven at a frequency corresponding to the frequency of discontinuous drawing of steel slabs. (4) In the device according to claim 3 for carrying out the method according to claim 2, the auxiliary fluid pressure pump (25) is a piston pump operating on both sides. One chamber (20) of this pump is on the inlet side of the hydraulically operated motor (14), the other chamber (27)
is connected to the exit side. (5) In the device set forth in claim 3 or 4, the main fluid pressure pump (17) comprises a transmission device (2
1), inter alia, it is connected to the auxiliary hydraulic pump via a variable speed transmission (21), and both the main and auxiliary hydraulic pumps (17, 25) can be driven by a common motor (78); A device characterized by: (6) In the device according to any one of claims 3 to 5, the main fluid pressure discharge conduit (19) is connected to another fluid pressure operated motor (20). This motor connects the main fluid pressure pump (1) with the linked shaft (20').
7) and said another fluid pressure operated motor (2
A device characterized in that the outlet of item 0) is connected to the inlet of the main fluid pressure pump by a conduit. (7) The device according to any one of claims 3 to 6, comprising at least one further auxiliary fluid pressure pump (31), which pump pumps the fluid in the conduit. A device characterized in that it is connected to the inlet of a pressure-actuating motor (14) and is driven at a frequency that is an integral multiple of the frequency of discontinuous drawing of the steel slab (4).