JPH0571341B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention involves cutting ingots of a certain length that are continuously extracted in an electroslag remelting furnace, which is one of high-grade steel manufacturing equipment, and applying an impact to the ingots. It concerns a device that receives and receives without giving.

[Background of the Invention] As is well known, in an electroslag remelting furnace (ESR furnace), a consumable electrode is immersed in molten slag in a water-cooled mold, and the consumable electrode is melted by electric resistance heating generated in the molten slag. The heat of the consumable electrode sequentially melts the tip and drips into the molten slag as droplets, and the dropped droplets form a molten steel pool in the water-cooled mold, which forms on the inner surface of the mold. It is surrounded by a thin layer of solidified slag and solidified to form an ingot. Then, as the ingot grows, the water-cooled mold a is raised as shown in Figure 6, and the seventh method is
As shown in the figure, a conventional method has been to lower the ingot b while keeping the water-cooled mold a fixed. In Figures 6 and 7, c is a consumable electrode and d is a consumable electrode.
is a support for ingot b, e is molten slag accumulated in water-cooled mold a, and f is a molten steel pool.

However, in either case, the length of the ingot b that can be made into an ingot is limited to a certain length or less by the movable stroke of the water-cooled mold a or the movable stroke of the support d. For this reason, each time an ingot of a certain length is made into an ingot, it is necessary to stop melting, remove the ingot, and then start making an ingot of a certain length again, which reduces productivity and yield. It wasn't good.

In order to solve such problems, the present inventors installed two grippers that are moved up and down by motors to grip the ingots that are sequentially extracted from the lower opening of the water-cooled mold. With the ingot being gripped by one gripper, the gripper is lowered in accordance with the extraction speed of the ingot, and before the gripper reaches the lower limit of its lifting stroke, the other gripper grips the ingot. The gripper is then lowered in accordance with the extraction speed of the ingot, and the gripper releases its grip and rises to grip the upper part of the ingot again, and in the same manner, both grippers are alternately operated to pull out the ingot. We developed an electroslag remelting furnace that can continuously form the desired long ingots, and filed a patent application for this invention separately from this case.

[Problems with the prior art] However, in the method for continuously extracting ingots as described above, the ingots are cut into appropriate lengths, but when the ingots are cut during extraction, the separated ingots are There was a problem with the product falling and causing a shock.

[Means for Solving the Problems] The ingot cutting support device of the present invention is intended to solve the above problems, and includes a consumable electrode immersed from above into molten slag accumulated in a cylindrical water-cooled mold,
An electroslag remelting furnace that melts the consumable electrode by electric resistance heating generated in the molten slag, and continuously extracts an ingot formed by solidifying the droplets from the lower opening of the water-cooled mold. A pedestal is provided to support the lower end of the ingot and descend in synchronization with the extraction speed of the ingot, and the ingot is cut to a certain length by detecting the descending position of the pedestal and attaching it to the ingot. It is characterized by being equipped with a cutting device.

[Function] The ingot separated by cutting is supported on the pedestal without impact.

[Embodiment] Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 3. In the figure, 1 is a cylindrical water-cooled mold supported on a pedestal 2, 3 is a consumable electrode suspended therein, and 4 is an ingot formed in the mold 1. Linear bearings 5a, 5a, 5b, 5b are provided inside the columns 2a, 2a, 2b, 2b of the frame 2, and the grippers 6a, 6b are provided so as to be able to move up and down along these columns. Both grippers 6a, 6b are pivoted on support shafts 8a, 8b so that a pair of fingers 7a, 7a, 7b, 7b can be opened and closed, respectively, and the tips of the fingers are opposed to both sides of the ingot 4. Cylinders 9a and 9b are interposed between the other ends of the fingers, and when the cylinders 9a and 9b are extended, the fingers move, and their tips grip the ingot 4.
The upper and lower ends of 10a and 10b are bearings 11a and 1, respectively.
2a, 11b, 12b, the screw shafts 10a, 12b are rotatably supported vertically.
10b is a motor 13a, 1 installed on the frame 2.
3b. And grippers 6a, 6
Female screw bodies 14a, 14b provided on the back of the screw shafts 10a, 10b are screwed together. Therefore, when the screw shafts 10a and 10b rotate, the gripper 6
a and 6b are designed to move up and down. Note that a melting current is constantly applied to the ingot 4 through the gripper 6a or 6b.

Reference numeral 15 denotes a cutting device provided below the grippers 6a, 6b, and the cutting device is provided so as to be able to move up and down along a guide column 16 vertically erected on one side thereof. Reference numerals 17 and 17 denote gripping pieces that are pivotally supported on a support shaft 18 so as to be openable and closable. A cylinder 19 is interposed between the cylinders 19 and 19.
is extended and its tip grips the ingot 4. A plasma torch 20 is provided below the gripping pieces 17, 17 so as to face the ingot 4. The cutting device 15 is suspended from one end of a wire rope 21, and the wire rope 21 is wound around a pulley 23 rotatably supported on a base 22. 25 is a motor provided on the base 22 to drive the pulley 23 in rotation. On the other hand, a rail 2 is mounted on a base 26 provided on the opposite side of the cutting device 15 across the ingot 4.
A trolley 2 on which the rails 7 are laid and is capable of running on the rails.
A guide column 29 is suspended from 8. A pedestal 30 is disposed on the guide column 29 so as to be able to move up and down. Reference numeral 31 denotes a wire rope from which the pedestal 30 is suspended.The wire rope is wound around a pulley 32 that is rotatably supported on the cart 28, and has a balance weight 33 fixed to the other end. There is.
34 is a hydraulically operated motor that rotates the pulley 32. Note that the pedestal 30 is provided with a limit switch 35 that is operated by the ingot 4. As shown in FIG. 4, the hydraulic motor 34 is connected to a 4-port 3-position switching valve 38 connected to an oil tank 37 of a pump 36, and a variable flow rate control valve 39 and a check valve 40 are connected in series. The connected bypass path is connected in parallel with this motor 34 to constitute a hydraulic circuit. A pulse generator (not shown) is directly connected to the pulley 32 and detects the rotational position of the pulley 32 using an electric signal.
The height of the object can be detected. Further, an electromagnetic brake is directly connected to the motor 34, so that the rotation of the motor 34 can be stopped by an electric signal.

In the electroslag remelting furnace configured as described above, the ingot 4 extracted from the lower opening of the water-cooled mold 1 is held by one of the grippers 6a, and rotated by the motor 13a to match the ingot extraction speed. The gripper 6a is lowered by controlling the rotation of the screw shaft 10a. Then, before the gripper 6a reaches the lower end of its vertical stroke, the other gripper 6b grips the ingot 4, and the gripper 6b is rotated by the rotation of the screw shaft 10b whose rotation is controlled by the motor 13b. At this time, the motor 13 is lowered to match the extraction speed of the ingot 4.
The lowering speed by motor 13a is made to be the same as the lowering speed by motor 13a. Meanwhile, the gripper 6a releases the grip on the ingot 4 and releases the grip on the screw shaft 10.
By reversing a, it is raised and held at the upper end of the vertical stroke. Then, before the gripper 6b reaches the lower end of its vertical stroke, the gripper 6a is made to grip the ingot 4 again and lowered in accordance with the extraction speed. During this time, the other gripper 6b releases its grip, rotates the screw shaft 10b in the reverse direction, raises it, and waits at the upper end of the vertical stroke. Thereafter, the two grippers 6a and 6b alternately hold the ingot 4 in the same manner, and the ingot 4 is continuously lowered in accordance with the extraction speed.

The lower end of the ingot 4 is supported by a pedestal 30, which is suspended from a wire rope 31 and connected to a motor 34 by a pulley 32 wound around the wire rope 31. The motor 34 is mounted on the pedestal 3
0 supporting the ingot 4, the flow rate adjustment valve 39 and the check valve 4 are closed as shown by the arrows in FIG.
By circulating hydraulic oil through the bypass circuit consisting of 0, the pedestal 30 is allowed to descend under a constant load. Since the lowering position of the pedestal 30 can be detected by an electric signal obtained from the pulse generator of the pulley 32, the length of the lowering of the ingot can be measured by counting the signal. When the ingot reaches a certain length, the cylinder 19 of the cutting device 15 is actuated by an electric signal from the pulse generator of the pulley 32 to grip the gripping pieces 17 on both sides of the ingot 4, and the plasma arc 20 is activated. let Then, the ingot 4 is cut at the lower side of the gripping portion using a plasma torch. The gripping pieces 17, 17 are attached to the ingot 4 from the start of cutting to the end of cutting, and the pulley 23 rotates freely so that the position of the plasma torch 20 facing the ingot 4 does not change. When the ingot 4 is cut, the load of the separated ingot 4' is borne on the pedestal 30. This increases the load on the motor 34, but the rotation speed of the motor 34 is limited by the flow rate control valve 39 (adjusted to a speed faster than the drawing speed to prevent cut ingots from re-welding). stand 3
The ingot 4' is lowered at an adjusted speed, and the lowering is stopped by the electromagnetic brake at a predetermined position, and then the cart 28 moves backward on the rail 27, so that the ingot 4' can be carried out to the side. The ingot 4' cut to a certain length in this way can be removed from the pedestal 30. Meanwhile, the cutting device 1
5 releases the grip of the ingot 4 by the gripping pieces 17, 17, raises it by the drive of the motor 25, and waits at the upper end of the guide column 16. After the ingot 4' is removed, the trolley 28 is returned to its original position, the switching valve 38 is switched, it is raised by the drive of the motor 34, and it is stopped at a constant height by the operation of the electromagnetic brake. When the limit switch 35 comes into contact with the lower end of the next ingot 4, the electromagnetic brake is released by the signal, and the hydraulic oil is circulated through the bypass path so that the pedestal 30 descends as the ingot 4 descends. Set. As shown in FIG. 5, the growth length L of the ingot 4' is determined by the distance S between the standby position 30 and the plasma torch 20, and the descending distance detected by the pulse generator. Since it can be obtained by adding C, an ingot of the desired length can be cut by gripping the ingot 4 with the gripping pieces 17 of the cutting device 15 and activating the plasma torch 20 according to the count signal of the pulse generator. . Thereafter, ingots of a certain length are obtained in the same manner, and the pedestal 30 receives and supports them without impact.

[Effects of the Invention] As described in the embodiments above, the ingot cutting and supporting device of the present invention can cut into ingots that are continuously extracted from a water-cooled mold while the lower ends of the ingots are supported on the pedestal. Since the device is attached and cut, ingots of a certain length can be safely supported without being subjected to impact, which has the effect of improving productivity through continuous ingot formation.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an electroslag remelting furnace showing one embodiment of the present invention, and Fig. 2 is
3 is a cross-sectional view taken along the Y-Y line in FIG. 1, FIG. 4 is a hydraulic circuit diagram of the motor for lifting and lowering the pedestal,
FIG. 5 is an explanatory diagram of the growth length of the ingot. 6 and 7 are schematic diagrams for explaining the operating method of a conventional electroslag remelting furnace. 1... Water-cooled mold, 3... Consumable electrode, 4... Ingot, 15... Cutting device, 16... Guide column,
17, 17...Gripping piece, 20...Plasma torch, 25...Motor, 28...Dolly, 29...Guide column, 30...Band, 34...Motor.

Claims (1)

[Claims] 1. A consumable electrode is immersed from above into the molten slag that accumulates in a cylindrical water-cooled mold, and the consumable electrode is melted by electrical resistance heating generated in the molten slag, and the droplets solidify and form. In an electroslag remelting furnace in which ingots are continuously extracted from the lower opening of the water-cooled mold, a pedestal is provided that supports the lower end of the ingot and descends in synchronization with the extraction speed of the ingot. 1. An ingot cutting support device for an electroslag remelting furnace, comprising a cutting device that detects the lowered position of the ingot and attaches it to the ingot to cut the ingot into a fixed length.