JPH091293A - Mold for continuous casting equipment and method for setting this - Google Patents

Abstract

PURPOSE: To enable change of a cast slab width even during casting and a cast slab thickness by changing short side frame, by automatically matching the center of the short side surfaces with the center of a gap between long side surfaces, at the time of changing the gap between the long side surfaces. CONSTITUTION: The fixed side and movable side long side frames 1, 2 provide long side copper plates 7 and interpose the short side frames 3 and are connected with tie rods 8, and base short side frames 4 and changing short side frames 5 are attachable/detachable. A rod 11 for shifting the short side is connected with the base short side frame 4 through a joint 12. The movable side long side frame 2 is shifted in the thickness direction of the cast slab by the increased width of the short side frame 3, and a guide 14 is shifted by 1/2 of the shifting size in the thickness direction of the cast slab of the movable side long side frame 2 to execute the automatic alignment between the center of the short side frame thickness and the rod 11. In such a way, the change of the cast slab width can be executed even during casting and further, the change in the cast slab thickness can be executed by changing the short side frames 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for continuous casting equipment and a method for setting the mold.

[0002]

2. Description of the Related Art Generally, in continuous casting equipment, the amount of molten steel poured into an intermediate pot called a tundish is adjusted so that it is once poured into a copper mold called a mold. The mold is always cooled, and the outer shell of the cast piece is solidified in this mold to form the desired cast shape, which is then pulled out from the bottom of the mold by the pinch roller and sprayed with water in the spray band while being supported by the apron roller. After the solidification is promoted and the solidification is completed, it is cut into a required length to produce a slab. As described above, the mold is an important device that greatly influences the shape of the slab in continuous casting equipment, and various improvements have been made so far.

Conventionally, as a mold having the simplest structure, there is a structure called an assembly type in which four copper plates are assembled (hereinafter referred to as a first conventional technique). The first conventional technique will be briefly described below. In the first conventional technique, one of the long-side frames constituting the mold is set as a fixed side, and the movable-side long-side frame facing the fixed-side long-side frame is movably attached, and a desired long-side frame is provided between the long-side frames. It had a structure in which a short side frame made according to the thickness of the slab was sandwiched in a replaceable manner. When changing the slab thickness, the entire short-side frame must be removed and replaced with a short-side frame of the desired thickness, and it is necessary to prepare many types of short-side frames in advance and it takes a lot of time to replace the mold size. Although the structure is simple, it has various problems. Japanese Utility Model Laid-Open No. 6-5742 is known as a solution to the above-mentioned problem of the first prior art. This allows you to quickly replace the short side frame online and at the same time
Even during casting, the width of the slab can be freely changed by moving the short side frame by the short side moving device (hereinafter referred to as the second conventional technique). The basic structure of the second conventional technique will be described below. FIG. 6 is a plan view of the second conventional technique. A short side frame 3 is sandwiched between a fixed side long side frame 1 and a movable side long side frame 2, and the short side frame 3 is connected by a tie rod 9 and supported by a spindle 5. Both the long side frames 1 and 2 are provided with a long side copper plate 6, and the gap adjustment between the two long sides by exchanging the short side frame 3 is adjusted by a clamp device 7 and a worm jack 8.
The worm jack 8 is driven by the drive device 45. The spindle 5 is composed of a screw cylinder 21 and a screw rod 22, and the base end of the screw rod 22 is supported by a thrust bearing 24. A drive device 26 is connected to the end of the screw rod 22 via a universal joint 25. When the screw rod 22 is rotated by the drive device 26, the screw cylinder 21 is retracted in the axial direction to change the width of the cast piece. Further, the spindle 5 includes the guide block 31 and the bracket 3.
The guide block 31 and the bracket 34 are supported by the guide grooves 3 provided in the long side frames 1 and 2.
It has a structure that slides in the inside of 2, 33. Therefore, by driving the worm jacks 41 and 42, the guide block 31 and the bracket 34 slide to align the spindle 5 in the thickness direction of the cast piece. Also, the warm jack 4
1, 42 are driven by a drive device 45. As mentioned above,
In the second prior art, when changing the width of the slab, the short side frame 3 is changed and adjusted to an arbitrary width by the short side moving device, and when changing the thickness of the slab, only the short side frame 3 is replaced and cast. One side thickness can be changed. In addition, when adjusting the movement of the short side frame, there is a concern that the long side copper plate and the short piece copper plate may be twisted due to the eccentricity of the pressing force between the spindle and the short side frame, which may damage the long side copper plate. The short side frame 3 is clamped between the long side frames 1 and 2 because the eccentricity of the force does not occur by sliding the slab so that the pressing force on the short side is always centered on the thickness of the slab. In this state, the long side copper plates 6 can be moved in the width direction of the slab without damaging them. However, the short side moving device in this equipment has a complicated structure and the adjustment of the short side frame is complicated.

[0004]

In the first prior art,
Although the structure of the mold was simple, it is impossible to change the mold size unless the short side frame is replaced, so it takes a lot of time to change the thickness and width of the cast piece.
At the same time, there was a problem that a large number of special short-side frames were required according to the mold size, and the equipment cost was high.

In the second prior art which has been improved to solve the problem of the first prior art, the short side moving device is provided to move the short side in the width direction of the slab when changing the width of the slab. The width of the slab can be changed even during casting, and when changing the thickness of the slab, only the short-side frame is replaced to shorten the replacement time. At the same time, the guide block is slid so that the spindle position is centered in the thickness direction of the slab according to the short side thickness so that the spindle pressing force does not always become an eccentric load, and the long side frame and the short side frame are It is designed to prevent prying.

However, although the second prior art eliminates the drawbacks of the first prior art, it requires a guide block, a guide groove for sliding a bracket, a worm jack, and a drive device therefor, which makes the device complicated. Inevitably, at the same time, when changing the gap between the two long sides, it was necessary to always move the spindle position to the center of the slab thickness, and adjustment was complicated.

The object of the present invention is to solve the problems of the first prior art, to make the structure simpler than that of the second prior art, and to press the short side of the short side moving device with the pressing force of the slab thickness. At the same time, it is an object of the present invention to provide a variable mold for continuous casting, which is equipped with an automatic centering device which is always centered in the thickness direction of the slab.

[0008]

To achieve the above object, the present invention comprises a fixed long side frame and a pair of replaceable short side frames sandwiched between movable long side frames,
The both long-side frames have a worm jack for adjusting the gap between the long-side frames and a clamp device provided with a drive device thereof, and the short-side frame is a slab capable of being adjusted in the width direction of the slab by a short-side moving device. A variable thickness mold,
The short side moving device is a rod for pressing and moving the short side frame to change the width of the slab, and a guide for supporting the rod in its radial direction and slidably in the axial direction, and A worm jack for moving and adjusting the rod and a driving device therefor, and a guide of the short side moving device is supported by the long side frames and at least one pair of rotatable joints to form a link mechanism. At least a pair of rotatable joints constitute a link mechanism between the rod and the worm jack that moves the rod in the axial direction, and the guide is equipped with a cylinder to provide a variable mold for continuous casting.

Further, preferably, a plurality of link mechanisms for supporting the guide and the long side frames are provided on both sides of the long side frames in the casting movement direction, both of the short side frames. Further, preferably, the guide, the rod, the worm jack of the short side moving device and the driving device thereof are provided in plural on both sides of the long side frame in the slab moving direction on both sides of the long side frame.

[0010]

In the variable slab thickness mold for continuous casting of the present invention constructed as described above, the short side moving device is provided with the above-mentioned second device.
The guide block and bracket as in the prior art described above are slid along the guide groove to move the spindle position, and the pressing force to the short side frame of the spindle is not adjusted to the slab thickness center, The guide of the side moving device and both long side frames constitute a link mechanism with at least a pair of rotatable joints to support, and when adjusting the gap between the two long sides by the clamp device, the link mechanism keeps the guide, rod and Since the short side frame is centered in the thickness direction of the slab, the guide block, bracket, guide groove, and worm jack and drive device for sliding of the prior art 2 are not required, and the structure is simplified and the short side frame is pressed. The force can be automatically adjusted. Also,
By forming and supporting the worm jack and the rod of the short-side moving device with at least one pair of rotatable joints to form a link mechanism, the worm-jack of the short-side moving device without the universal joint and the same as in the second prior art. The drive device can be fixedly driven. Also,
It may be difficult to adjust the position of the short side frame due to the gap at the fulcrum of the link mechanism and backlash in the jack of the short side moving device.However, it is necessary to fix the cylinder to the guide and always pull the short side frame with the cylinder. The adjustment error can be avoided by.

[0011]

【Example】

(Embodiment 1) An embodiment of a variable mold thickness for continuous casting according to the present invention will be described with reference to FIGS. 1, 2 and 3.

FIG. 1 is a plan view of a cast variable thickness mold for continuous casting according to this embodiment. In FIG. 1, the fixed side long side frame 1 and the movable side long side frame 2 are provided with a long side copper plate 7,
The short side frame 3 is held and connected to each other by a tie rod 8, and the clamp device 10 and the worm jack 9 are connected.
The movable side long side frame 2 is movable with respect to the fixed side long side frame 1 by the known structure. The short side frame 3 is composed of a base short side frame 4, an exchange short side frame 5 and a short side copper plate 6, and the base short side frame 4 and the exchange short side frame 5 are detachable. The rod 11 of the short side moving device is connected to the base short side frame 4 via the joint 12 and the pin 13. The other side not shown has the same structure, and the worm jack 9 is driven by a drive source such as an electric motor.

Next, the short side moving device will be described.
The rod 11 is supported in the radial direction by a guide 14 and is connected to a rod of a worm jack 18 of a short side moving device via a joint 16 and a socket 17. still,
The rod 11 and the joint 16, and the joint 16 and the socket 17 are connected via the pin 13, respectively. The guide 14 has a bush 15 on the guide surface,
Similarly, since the bush 15 is also provided on the rod guide surface of the worm jack 18 in the fixed-side long side frame 1, the rod 11 has a structure capable of sliding smoothly in the slab width direction. Therefore, the short side frame 3 can be slid in the slab width direction by driving the worm jack 18 using the driving device 19 of the short side moving device as a drive source.

In FIG. 2, two worm jacks 1
8 is driven by one drive device 19, but this drive may be performed by a device that moves each worm jack 18 independently.

Next, details of the automatic centering mechanism of the short side moving device will be described. The guide 14 has support pins 14a on the upper and lower sides in the front view of FIG. 2, and similarly, the guide pins 1a are also provided on the upper and lower sides of the fixed-side long side frame 1. The support pin 14a of the guide 14 and the support pin 1a of the fixed-side long side frame 1 are connected by a joint 20, and the joint 20 has the support pin 1a and the guide 14 of the fixed-side long side frame 1.
Can be rotated about the support pin 14a of the fulcrum. Therefore, the guide 14 and the fixed long-side frame 1 are joint 2
The link mechanism is configured via 0.

Here, tentatively, the worm jack 9 for adjusting the gap between the long-side frames is driven to drive the fixed-side long-side frame 1.
Assuming that the gap between the movable side long side frame 2 and the movable side long side frame 2 is widened and the short side frame 3 is replaced and the cast piece thickness is changed, the plan schematic view of the cast piece variable thickness mold for continuous casting of this embodiment is shown in FIG. Like In FIG. 3, the movable side long side frame 2 is
The short side frame 3 is moved in the width direction of the slab by an amount corresponding to the increased width, and the guide 14 is provided with support pins provided on the guide 14, the fixed side long side frame 1 and the movable side long side frame 2, respectively. The joint 20 rotates around the support pin 20a as a fulcrum, and the guide 14 moves in the direction in which the width of the slab is narrowed by the link mechanism. At the same time, the movable side long side frame 2 moves in the thickness direction of the slab. Similarly, it moves in the thickness direction of the slab by half the length. Therefore, the center of the slab thickness direction of the guide 14 necessarily moves to the center of the slab thickness and the short side frame thickness. Therefore, since the rod 11 supported in the guide 14 in the radial direction also moves in accordance with the movement of the guide 14, the axial center of the rod 11 also has a slab thickness,
Since it always moves to the center of the short side frame thickness, the rod 11 of the short side moving device is automatically aligned. Further, when the rod 11 moves as described above, the worm jack 18 of the short-side moving device is fixed to the fixed-side long-side frame 1, so that the axis of the rod 11 and the shaft of the rod of the worm jack 18 of the short-side moving device are fixed. Although the core is displaced, since the rod 11 and the rod of the worm jack 18 of the short side moving device are connected by the joint mechanism by the link mechanism 16, the joint 16 rotates around the worm jack side of the short side moving device as a fulcrum. Since it supports, there is no hindrance to the movement of the short side frame 3. If the gap between the long sides is widened to increase the thickness of the slab, the joint 16 will move to the socket 17
Since the pin 13 connecting the and is rotated about the fulcrum, if the gap between the long sides is widened, the rod 11 retracts toward the worm jack 18 of the short side moving device. Therefore, if the slab thickness is changed, the short side frame is changed. The position is different from the position before the change of the slab thickness. However, the movable long side frame 2
The moving amount of the rod 14 in the axial direction is ΔS, and the moving amount in the axial direction of the rod 14 is ΔS, and the moving amount of the rod 14 in the axial direction is expressed by the following equation.

[0017] ^{ΔS = M-√ (M 2} - (Δh) 2/4) in the above equation, 250 mm length M of the joint 16, when the movable long-side frame moving amount Delta] h to 40 mm, the rod axis direction movement amount ΔS is 0.8 mm, which can be said to be a small value with respect to the moving amount of the long side on the movable side, and the worm jack 18 can be moved by correcting the amount corresponding to the value of ΔS. Therefore, when adjusting only the slab thickness, as shown in FIG. 7, the detector detects the long-side frame movement amount Δh, the arithmetic unit calculates the rod axial movement amount ΔS from the above formula, and the rod is moved by ΔS. It is possible to change only the thickness of the slab by moving the in the axial direction.

A differential transformer or a gap sensor may be used as the detector.

A worm jack or the like can be considered as a means for moving the rod in the axial direction.

In this embodiment, the short side moving device is automatically aligned by using a lot of link mechanisms, and the short side is moved by the worm jack. Therefore, there is a concern about a gap between the link fulcrums and an adjustment error of the short side frame due to backlash in the worm jack 18. In order to solve this problem, this equipment has a cylinder 21 fixed to the guide 14 as shown in FIG. The cylinder 21
The rod and the base short side frame 4 are connected by a pin 13. Since the cylinder 21 constantly pulls the short side frame 3, the attractive force of the cylinder 21 acts as a reaction force on the support pins 1a and 14a contacting the joint 20, and at the same time acts on the joint 16 and the worm jack 18 of the short side moving device. To do. Therefore, the gap at the link fulcrum,
It is possible to eliminate the backlash in the worm jack 18 and eliminate the error in the movement adjustment of the short side frame.

According to the above-described embodiment of the present invention, when changing the thickness of the cast piece, the movable side long side frame 2 is driven by the worm jack 9 and only the exchange short side frame 4 is replaced. When changing the strip thickness and changing the strip width, the slab thickness can be changed by driving the worm jack 18 of the short side moving device to move the short side frame 3 in the strip width direction. Since the above-mentioned short-side moving device has an automatic centering device for constantly moving the rod 11 to the center of the slab thickness and the short-side frame thickness by the link mechanism, the prying between the both long-side frames and the short-side frames Does not occur. Further, the gap at the fulcrum of the link mechanism and the adjustment error of the short side frame due to the backlash in the worm jack can be eliminated by pulling the short side frame 3 by the cylinder 11 fixed to the guide 14. Therefore, while solving the problems of the first conventional technique, the structure is simpler than that of the second conventional technique and the short-side moving device is automatically aligned.

(Other Embodiments) Other embodiments of the cast variable thickness mold for continuous casting according to the present invention will be described with reference to FIGS. 4 and 5.

FIG. 4 is a schematic plan view of the cast variable thickness mold for continuous casting of this embodiment, and FIG. 5 is a front view of the cast variable thickness mold for continuous casting of this embodiment. The fixed long side frame 1 and the movable long side frame 2 are provided with a long side copper plate 7, sandwich the short side frame 3 and are connected to each other by a tie rod 8. The fixed long side frame is fixed by a clamp device 10 and a worm jack 9. Movable long side frame 2 relative to 1
Has a movable structure. In addition, the short side frame 3
Is composed of a base short side frame 4, an exchange short side frame 5 and a short side copper plate 6, and the base short side frame 4 and the exchange short side frame 5 are detachable. The rod 11 of the short side moving device is connected to the base short side frame 4 via the joint 12 and the pin 13, and the short side copper plate 6 is fixed to the exchange short side frame 5. The other side not shown has the same structure, and the worm jack 9 is driven by a drive source such as an electric motor. Also, the rod 11
Is supported by the guide 14 in the radial direction. In the present embodiment, except that the worm jack 18 of the short side moving device is separated from the fixed long side frame 1 and directly fixed to the guide 14 and the rod of the worm jack 18 is replaced with the rod 14 of the short side moving device. The configuration of is the same as that of the first embodiment. Therefore, the worm jack 18 is integrated with the guide 14, and when the slab thickness is changed by the link mechanism, the worm jack 18 is moved along with the movable long side frame 2 and the slab thickness is the same as the guide 14.
It will move to the center of the short side frame thickness. Therefore, it can be configured without connecting the worm jack and the rod of the short-side moving device to each other via the link as in the first embodiment. As described above, in the present embodiment, the first embodiment
The structure is further simplified, and the same effect as that of the first embodiment can be obtained.

However, the worm jack 18 and the guide 14
Since the and are connected, the movement of the link is short piece frame 3
Will move the position of. This movement amount can be corrected by moving the worm jack 18 in the same manner as in the first embodiment.

[0025]

According to the present invention, in the variable mold for continuous casting, in the variable mold for continuous casting of the present invention, which is constituted between the fixed-side long side frame and the movable-side long side frame, the short side movement is achieved. The guide, rod, and short side frame are always kept in the thickness direction of the slab by the link mechanism when adjusting the gap between both long sides by the clamp device by supporting the device guide and both long side frames by the link mechanism. Since it becomes the center, the problems of the first conventional technology are solved, and the second
Prior art guide block, bracket, guide groove,
Further, the worm jack for sliding and the driving device are not required, the structure is simplified, and the pressing force of the short side frame can be adjusted automatically. Further, by supporting the worm jack and the rod of the short-side moving device via a pair of links, the worm jack of the short-side moving device and its driving device can be fixedly driven without a universal joint as in the case of the related art 2. Also, the worm jack of the short side moving device can be attached directly to the guide to further simplify the structure. It may be difficult to adjust the position of the short side frame due to backlash in the jack of the link mechanism and the short side moving device, but it is possible to adjust by backlash by fixing the cylinder to the guide and pulling the short side frame with the cylinder. Errors can be avoided. Therefore, while solving the problems in the first prior art of a structure called an assembly type in which four copper plates are assembled, the structure is simplified as compared with the second prior art that does not have an automatic centering device, It is possible to provide a slab variable thickness mold for continuous casting that also has automatic centering.

[Brief description of the drawings]

FIG. 1 is a plan view of a slab variable thickness mold for continuous casting according to a first embodiment of the present invention.

FIG. 2 is a side view of the cast variable thickness mold for continuous casting according to the first embodiment of the present invention.

FIG. 3 is a plan view when changing the cast piece thickness of the cast piece variable mold for continuous casting according to the first embodiment of the present invention.

FIG. 4 is a plan view of a cast variable thickness mold for continuous casting according to a second embodiment of the present invention.

FIG. 5 is a side view of a cast variable thickness mold for continuous casting according to a second embodiment of the present invention.

FIG. 6 is an explanatory diagram of a conventional technique.

FIG. 7 is an explanatory view of a mold setting method when changing only the thickness of a cast piece according to the present invention.

[Explanation of symbols]

1 ... Fixed long side frame, 2 ... Movable long side frame, 3 ... Short side frame, 4 ... Base short side frame, 5 ... Replacement short side frame, 6 ... Short side copper plate, 7 ... Long side copper plate, 8 ... Tie rod, 9 ... Worm jack, 10 ... Clamping device, 11
… Rods, 12, 16… Joints, 13… Pins, 14
... Guide, 15 ... Bush, 17 ... Socket, 18 ... Worm jack of short side moving device, 19 ... Short side moving device drive device, 20 ... Link, 21 ... Cylinder.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hironori Shimogama 3-1-1, Saiwaicho, Hitachi-shi, Ibaraki Hitachi Ltd. Hitachi factory

Claims (7)

[Claims] 1. A long side member having a pair of long side faces opposed to each other and a short side member having a short side face in the gap with an arbitrary gap formed between the long side faces to form four sides. In a mold of a continuous casting apparatus for casting rectangular shaped slab, when the arbitrary gap between the long side surfaces is changed, the center of the short side surface of the short side member is automatically set to the long side. A mold for continuous casting equipment, characterized in that the center of an arbitrary gap between surfaces is automatically made to substantially coincide with the center. 2. The support according to claim 1, wherein each of the pair of opposed long side members has a fulcrum, one end of the joint is attached to the fulcrum of the long side member, and the other end is a fulcrum to the short side member. A mold of a continuous casting facility in which a short side member is supported between a pair of long side members in a link shape by providing a support point. 3. The short side member according to claim 2, further comprising a guide for extending the rod from the short side member to a side opposite to the cast piece passage, and supporting the rod in a radial direction. A mold of a continuous casting facility in which the width of the slab is adjusted by moving the slab, and the guide is supported in a link shape between long side members. 4. The mold of a continuous casting facility according to claim 3, wherein a joint of a link mechanism is provided between the rod and a moving means for moving the rod. 5. A mold for continuous casting equipment according to claim 3, wherein a moving means is attached to the guide to move the rod supported by the guide. 6. The method of claim 1, 2, 3, 4, or 5,
A mold for a continuous casting facility having a gap at a fulcrum of the link mechanism and a cylinder for removing play in the short side moving means. 7. The method according to claim 1, 2, 3, 4, 5 or 6, wherein when the gap between the long side surfaces is arbitrarily changed, the movement amount of the long side surface is detected and And a method for setting a mold of a continuous casting facility in which the short side is moved by a moving unit that moves the rod so that the slab width becomes constant.