JP5544185B2 - Continuous casting mold - Google Patents

Description

The present invention relates to a continuous casting mold used for producing a slab.

Conventionally, continuous casting of a slab is formed by being surrounded by a cooling member (water-cooled copper plate) and using a continuous casting mold having a space portion penetrating in the vertical direction, and the molten steel supplied to the space portion is cooled by the cooling member. This is done by solidifying while cooling. Here, in the production of the slab, it is necessary to surely grow the solidified shell formed in the space portion. However, when the solidified shell growth is unstable, the solidified shell is broken during casting and unsolidified. There is a breakout in which the molten steel flows out, and there is a risk of causing an accident such as interruption of the casting operation, a long pause, and damage to the equipment. Therefore, a continuous casting mold is disclosed in which a plurality of thermocouples are embedded in a cooling member and a temperature change or the like of these thermocouples is detected (see, for example, Patent Document 1).

JP 2006-284503 A

Here, the continuous casting mold described in Patent Document 1 detects a temperature change of the cooling member, and when the temperature of the cooling member decreases, the contact state between the cooling member and the solidified shell decreases. Although it can be determined, it cannot be determined how much the position of the cooling member should be moved to the solidified shell side in order to recover the contact state between the cooling member and the solidified shell. For this reason, if the contact state between the cooling member and the solidified shell does not recover even if the position of the cooling member is changed, insufficient cooling of the molten steel occurs, and the growth of the solidified shell becomes unstable, causing a breakout. Problems arise. On the other hand, when the position of the cooling member is changed so that the cooling member strongly presses the solidified shell, an excessive force acts on the solidified shell to break the solidified shell, causing a problem that breakout or slab cracking occurs. .

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances. A continuous casting mold capable of monitoring a contact state between a cooling member and a solidified shell and performing a stable casting operation without occurrence of breakout or slab cracking. The purpose is to provide.

The continuous casting mold according to the present invention that meets the above-described object is disposed on the back side of each cooling member and a pair of opposing cooling members, and the cooling members are fixed via a plurality of fastening bolts. In a continuous casting mold having a support member and a holding mechanism connected to the back side of the support member and holding the cooling member via the support member,
A bolt having a load sensor for detecting a stress generated in the cooling member during casting is attached to a through screw hole formed in the support member, and the back surface side of the support member of the through screw hole The base side of the bolt is fixed, the region on the cooling member side of the through screw hole is a diameter-enlarged portion, and the tip side of the bolt is a spherical portion, which is in contact with the back surface of the cooling member .

In the continuous casting mold according to the present invention, the cooling member may be a short side of the continuous casting mold, and the load sensor may be attached to the support member that fixes the short side.
The cooling member may be a long side of the continuous casting mold, and the load sensor may be attached to the support member that fixes the long side.

In the continuous casting mold according to the present invention, a load sensor for detecting the stress generated in the cooling member during casting is provided, so that the cooling member receives from the slab during casting from the stress generated in the cooling member. The magnitude of the force can be known, and the contact state between the cooling member and the solidified shell can be monitored. As a result, a solidified shell having a sufficient thickness can be stably formed, and a stable casting operation can be performed without occurrence of breakout or slab cracking.

In the continuous casting mold according to the present invention, when the cooling member is the short side of the continuous casting mold and the load sensor is attached to the support member that fixes the short side, the long-term use of the continuous casting mold As the short side wears and the thickness decreases, the reaction force that the short side receives from the solidified shell changes, and the changed reaction force can be detected by the load sensor. Can be monitored to determine the repair timing.
In addition, when the cooling member is the long side of the continuous casting mold and the load sensor is attached to the support member that fixes the long side, the long side is worn with long-term use of the continuous casting mold. As the thickness decreases, the reaction force received by the long side from the solidified shell changes, and the changed reaction force can be detected by the load sensor. Can be determined.

It is explanatory drawing of the casting mold for continuous casting which concerns on the 1st Embodiment of this invention. It is explanatory drawing of the short side and short side side supporting member of the same casting mold. It is explanatory drawing of the load sensor attached to the short side support member of the same casting mold. It is explanatory drawing which shows the attachment method of the load sensor which concerns on a modification. It is explanatory drawing of the load sensor attached to the short side support member in the casting mold for continuous casting which concerns on the 2nd Embodiment of this invention. (A) is explanatory drawing of the casting mold for continuous casting which concerns on the 3rd Embodiment of this invention, (B) is explanatory drawing of the load sensor attached to the cylinder for short side space | interval adjustment.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIG. 1, the continuous casting mold 10 according to the first embodiment of the present invention is a pair of long sides (an example of a pair of cooling members that are opposed to each other with a gap therebetween). Specifically, the pair of short sides (specifically, a pair of cooling members sandwiched between the pair of long sides 11 and opposed to each other with a gap therebetween) (It is also called a copper plate or a short piece) 12. The continuous casting mold 10 is disposed on the back side of the long side 11, and the long side support member (an example of a support member) in which the long side 11 is fixed via a plurality of fastening bolts (not shown). 13 and a holding mechanism (not shown) that is connected to the back side of the long side support member 13 and holds the long side 11 via the long side support member 13. Further, the continuous casting mold 10 is disposed on the back side of the short side 12, and a short side support member (an example of a support member) 15 in which the short side 12 is fixed via a plurality of fastening bolts 14, and a short side. It has a holding mechanism 16 that is connected to the back side of the side support member 15 and holds the short side 12 via the short side support member 15. Details will be described below.

As shown in FIG. 2, the short side 12 (the same applies to the long side 11) is used to supply cooling water to a large number of water guide grooves 17 and 18 provided in the vertical direction on the back surface side (the side opposite to the molten steel contact surface side). By flowing, the short side 12 is cooled and the molten steel is cooled to form a solidified shell (slab). For example, the short side 12 has a width of about 50 mm to 300 mm (equal to the distance between the pair of long sides 11), and a vertical length of about 600 mm to 1200 mm. Further, the long side 11 has a width that can change the interval between the pair of opposing short sides 12 in a range of 600 mm or more and 3000 mm or less, and the vertical length is the same as the short side 12. Degree. The short side 12 and the long side 11 are made of copper or a copper alloy. Reference numeral 19 denotes an O-ring that prevents cooling water from leaking between the short side 12 and the short side support member 15. Thereby, for example, a slab having a width of about 600 mm to about 3000 mm and a thickness of about 50 mm to about 300 mm can be manufactured.

The short side support member 15 (the same applies to the long side support member 13) is provided with a large number of water guide grooves 17 and 18 provided on the back side of the short side 12 from a water supply part (not shown) provided in the lower part thereof. Then, cooling water is allowed to flow to a drainage section (not shown) provided on the upper part of the short side support member 15 to cool the short side 12. As shown in FIG. 3, the short side support member 15 has a load sensor 20 (for example, a strain gauge, a load cell, or the like) that detects stress generated on the short side 12 during casting. Installed. Here, the load sensor 20 includes a detection unit 21 having an elongated shape (length: about 5 to 20 mm, width: for example, 0.5 to 2 mm), and a lead wire 22 for taking out a signal generated in the detection unit 21. It has. In order to attach the load sensor 20 to the short side support member 15, first, the load sensor 20 is placed in the hole 24 having a diameter of about 1 to 3 mm formed from the top of the bolt 23 along the axis. The detection unit 21 is inserted, the periphery is fixed with an adhesive, and the bolt 23 to which the load sensor 20 is attached is screwed into the through screw hole 25 formed in the short side support member 15 with the tip of the bolt 23 leading. A gap δ (for example, 0.1 to 1 mm) is provided between the tip of the bolt 23 and the back surface of the short side 12, but the tip of the bolt 23 may contact the back surface of the short side 12. .

The bolt 23 and the short side support member 15 are integrated by screwing the bolt 23 into the through screw hole 25 of the short side support member 15. For this reason, when the short side support member 15 is distorted, the bolt 23 screwed into the short side support member 15 is also distorted together with the short side support member 15. When the bolt 23 is distorted, the hole 24 is also distorted, the adhesive filling the hole 24 is distorted, and a signal corresponding to the distortion of the bolt 23 is output from the detection unit 21. Here, the distortion of the short side support member 15 is caused by the deformation of the short side 12 that occurs when the short side 12 is pushed back from the solidified shell as a reaction that the short side 12 pushes the solidified shell. From the amount of distortion of the bolt 23 measured in step 1, the load applied to the short side 12 from the solidified shell when the short side 12 is deformed can be obtained. In use, calibrate the load in advance.

In FIG. 4, the attachment method of the load sensor 20 which concerns on a modification is shown. In the modification, a hole 27 having a diameter of about 1 to 3 mm is formed in the short side support member 26 from the back surface side of the short side support member 26, and the detection portion 21 of the load sensor 20 is included in the hole 27. The front side of the load sensor 20 is fixed in the hole 27 by filling the hole 27 with an adhesive. Accordingly, when the short side 12 is distorted by the stress generated on the short side 12, the short side support member 26 to which the short side 12 is fixed is also distorted. When the short side support member 26 is distorted, the hole 27 is also distorted, the adhesive filling the hole 27 is distorted, and a signal corresponding to the amount of distortion of the short side support member 26 is output from the detection unit 21. The Here, the strain amount of the short side support member 26 is influenced by the strain amount of the short side 12 that distorts the short side support member 26, and the strain amount of the short side 12 is the stress generated in the short side 12. Since it is influenced, the load applied to the short side 12 can be obtained from the amount of distortion of the short side support member 26 measured by the detection unit 21.

The holding mechanism 16 includes short side interval adjusting cylinders 16 a attached to the upper and lower portions on the back side of the short side support member 15. The base of each short side interval adjusting cylinder 16a is attached to a mounting base (not shown) of the continuous casting mold 10, and the tip of the rod 28 of each short side interval adjusting cylinder 16a is supported on the short side. The pair of connecting receiving members 30 and 31 that protrude from the upper and lower portions of the back surface of the member 15 are inserted between the connecting receiving members 30 and 31 and connected to the connecting receiving members 30 and 31 via pins 32. Thus, by moving the rods 28 of the respective short-side interval adjusting cylinders 16a in synchronization, the interval between the opposed short sides 12 in a state where both sides in the width direction are sandwiched by the opposed long sides 11 is adjusted. can do.

Next, the operation of the continuous casting mold 10 according to the first embodiment of the present invention will be described.
While flowing cooling water through a large number of water guide grooves 17, 18 provided in the vertical direction on the back side of the short side 12 and a large number of water guide grooves provided in the vertical direction on the back side of the long side 11, a pair of When molten steel is supplied to the space formed by the short side 12 and the pair of long sides 11, the molten steel is cooled by the short side 12 and the long side 11 to form a solidified shell, and the solidified shell is drawn downward. Thus, a slab is manufactured. Here, the long side 11 is fixed at a predetermined position by the holding mechanism via the long side support member 13, the long side 11 facing each other is held at a predetermined interval, and the short side 12 is the short side support member. 15 is fixed to a predetermined position by a short side interval adjusting cylinder 16a through 15 and the opposed short sides 12 are held at a predetermined interval. For this reason, the short side 12 and the long side 11 push the formed solidified shell, and the solidified shell pushes back the short side 12 and the long side 11 (the reaction force from the solidified shell is applied to the short side 12 and the long side 11). Is added). When the surfaces of the short side 12 and the long side 11 are uniformly in contact with the formed solidified shell, the force of the short side 12 and the long side 11 pressing the solidified shell (the solidified shell is the short side 12 and the long side The reaction force that pushes back 11 is a value within a certain range (target load value).

During the casting, when the thermal deformation of the short side 12 becomes large or the surface side of the short side 12 is worn due to contact with the solidified shell, A gap is created between the surface of 12 and the solidified shell. As a result, insufficient cooling of the molten steel occurs, and the growth of the solidified shell becomes unstable. Further, the force with which the short side 12 pushes the solidified shell (reaction force with which the solidified shell pushes back the short side 12) also decreases. These can be detected as a decrease in the load value measured by the load sensor 20 attached to the short side support member 15.

Therefore, by operating the short side interval adjusting cylinder 16a, the short side 12 is pushed into the solidified shell side, and the load value measured by the load sensor 20 is restored to the target load value. In this way, it is possible to recover the state in contact with the solidified shell. At this time, since the short side interval adjusting cylinder 16a is operated while referring to the load value measured by the load sensor 20, it is possible to prevent the solidified shell from being strongly pressed by the short side 12, and the solidified shell is broken. Breakage and slab cracking can be avoided. As a result, a solidified shell having a sufficient thickness can be stably formed, and a stable casting operation can be performed without occurrence of breakout or slab cracking.

As shown in FIG. 5, the continuous casting mold 33 according to the second embodiment of the present invention is a bolt to which the load sensor 20 is attached as compared with the continuous casting mold 10 according to the first embodiment. The shape of 34 and the attachment structure with respect to the short side support member 35 of the volt | bolt 34 differ. For this reason, the shape of the bolt 34 and the attachment structure with respect to the short side support member 35 of the bolt 34 are demonstrated.

The bolt length L of the bolt 34 (the length of the shaft portion (portion excluding the head) where the screw is formed) is longer than the thickness of the short side support member 35 (for example, the thickness of the short side support member 35). Longer in the range of 0.5 to 5 mm). Further, the front end side of the bolt 34 is rounded to form, for example, a spherical portion (semispherical surface) 36 having the same diameter as the outer diameter of the bolt 34 (shaft portion). The shape of the spherical portion on the tip side of the bolt may be a shape that matches a part of the spherical surface having a diameter larger than the outer diameter of the bolt. And in the penetration screw hole 37 formed in the short side support member 35 to which the bolt 34 is attached, from the base side (the back side of the short side support member 35) into which the bolt 34 is screwed, the front side, for example, A female screw portion 38 that is screwed into the bolt 34 is formed in a range corresponding to a length that is 1/3 to 1/2 times the bolt length L, and a region on the front side of the female screw portion 38 is an enlarged diameter portion 38a. Yes.

With such a configuration, when the bolt 34 is screwed into the through screw hole 37, the base side of the bolt 34 is fixed to the short side support member 35 and the tip of the bolt 34 is attached to the back surface of the short side 12. It can be made to contact. The abutting portion of the short side 12 with which the tip of the bolt 34 abuts may be a recess having a curved surface that coincides with a part of a spherical surface having a diameter larger than the diameter of the spherical portion 36 on the tip side of the bolt 34. In use, calibrate the load in advance.

Subsequently, the operation of the continuous casting mold 33 according to the second embodiment of the present invention will be described. The basic operation of the continuous casting mold 33 is the continuous casting mold according to the first embodiment. Since it is basically the same as the operation of No. 10, the characteristic operation of the continuous casting mold 33 not provided in the continuous casting mold 10 will be described.
In the continuous casting mold 33, the bolt 34 is screwed into the through screw hole 37 of the short side support member 35, whereby the base side of the bolt 34 is fixed to the short side support member 35, and the tip of the bolt 34 is short side. 12 can be brought into contact with the back surface. For this reason, as a reaction in which the short side 12 pushes the solidified shell, when the short side 12 is pushed back from the solidified shell and the short side 12 is deformed, the bolt 34 has the short side 12 with which the tip of the bolt 34 abuts. Deforms following the deformation of the abutment. Here, the distortion in each part of the short side support member 35 is accompanied by deformation of each part of the short side 12 that occurs when the short side 12 is pushed back from the solidified shell as a reaction in which the short side 12 pushes the solidified shell. Therefore, the load applied to each part of the short side 12 from the solidified shell can be obtained from the amount of distortion of the bolt 34 measured by the detection unit 21. Therefore, the load value measured by the load sensor 20 can be recovered to the target load value by precisely operating the short side interval adjusting cylinder 16a.

As shown in FIG. 6 (A), the continuous casting mold 39 according to the third embodiment of the present invention has a load sensor 20 as compared with the continuous casting mold 10 according to the first embodiment. It is characterized by being attached to the rod 41 of the short side interval adjusting cylinder 16a instead of the short side support member 40. For this reason, only the attachment of the load sensor 20 to the rod 41 will be described.

As shown in FIG. 6B, a storage portion 42 is formed in the rod 41, which is parallel to the axis of the rod 41 and has a diameter of about 1 to 3 mm and a length of about 10 to 30 mm, and communicates with the storage portion 42. The detecting portion 21 on the front side of the load sensor 20 is inserted into the storage portion 42 from the communication passage 43 opened on the side surface of the rod 41 so that the longitudinal direction thereof is the axial direction of the rod 41. The inside of the passage 43 is filled with an adhesive, and the front side of the load sensor 20 is fixed in the storage portion 42 and the communication passage 43. Accordingly, when the short side 12 is distorted by the stress generated in the short side 12, the short side support member 40 to which the short side 12 is fixed is also distorted. When the short side support member 40 is distorted, the force applied to the rod 41 from the short side support member 40 changes, and the strain generated in the rod 41 also changes. As a result, the shape of the storage portion 42 formed in the rod 41 also changes, the adhesive filling the storage portion 42 is distorted, and a signal corresponding to the distortion of the short side support member 40 is output from the detection portion 21. Is done. Here, the strain amount of the short side support member 40 is affected by the strain amount of the short side 12 that distorts the short side support member 40, and the strain amount of the short side 12 is the stress generated in the short side 12. Since it is influenced, the load applied to the short side 12 can be obtained from the amount of strain of the rod 41 measured by the detection unit 21.
Note that the operation of the continuous casting mold 39 according to the third embodiment of the present invention is the same as the operation of the continuous casting mold 10 according to the first embodiment, and a description thereof will be omitted.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included.
For example, in the first embodiment, the load sensor can be attached to the long side support member that fixes the long side.
In the third embodiment, the load sensor may be attached to the fixing member of the short side interval adjusting cylinder used when the short side interval adjusting cylinder is attached to the mounting base of the continuous casting mold. In this case, the longitudinal direction of the detection part of the load sensor is made parallel to the axial direction of the short side interval adjusting cylinder.

10: Continuous casting mold, 11: Long side, 12: Short side, 13: Long side support member, 14: Fastening bolt, 15: Short side support member, 16: Holding mechanism, 16a: Short side interval adjustment Cylinder, 17, 18: Water guide groove, 19: O-ring, 20: Load sensor, 21: Detection part, 22: Lead wire, 23: Bolt, 24: Hole, 25: Through screw hole, 26: Short side support member 27: Hole, 28: Rod, 30, 31: Connection receiving member, 32: Pin, 33: Continuous casting mold, 34: Bolt, 35: Short side support member, 36: Spherical surface part, 37: Through screw hole , 38: female thread part, 38a: expanded diameter part, 39: casting mold for continuous casting, 40: short side support member, 41: rod, 42: storage part, 43: communication path

Claims (3)

A pair of opposing cooling members, a support member disposed on the back side of each cooling member, the cooling member being fixed via a plurality of fastening bolts, and connected to the back side of the support member; In a continuous casting mold having a holding mechanism for holding the cooling member via the support member,
A bolt having a load sensor for detecting a stress generated in the cooling member during casting is attached to a through screw hole formed in the support member, and the back surface side of the support member of the through screw hole The base side of the bolt is fixed, the region on the cooling member side of the through screw hole is a diameter-enlarged portion, the tip side of the bolt is a spherical portion, and is in contact with the back surface of the cooling member. Features a continuous casting mold. 2. The continuous casting mold according to claim 1, wherein the cooling member is a short side of the continuous casting mold, and the load sensor is attached to the support member that fixes the short side. A continuous casting mold. 2. The continuous casting mold according to claim 1, wherein the cooling member is a long side of the continuous casting mold, and the load sensor is attached to the support member that fixes the long side. A continuous casting mold.

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