JPS6145959Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cooling plate that is detachably attached to a bar of a walking bar type secondary cooling device of continuous casting equipment.

As shown in FIGS. 1 and 2, the cooling plate 1 of the walking bar type secondary cooling device is removably attached to the front surface of the walking bar 2, and is brought into direct contact with the surface of the slab A. This plate is used to directly cool the slab A by contact with the cooling liquid 4 which absorbs heat from the cooling liquid passage 3 provided in the cooling plate 1 and transfers the heat to the cooling liquid 4 flowing through the cooling liquid passage 3 provided in the cooling plate 1.

By the way, this type of cooling plate 1 is generally a hollow plate with a cooling liquid passage in a hollow part having a rectangular cross section, and in order to make it easier to manufacture, as shown in FIG. 11 and the plate 12 on the side to be attached to the walking bar. After sandwiching the spacers 14, 14 having a width that constitutes the coolant passage 13, the plates 11, 12 and the spacers 14, 14 are aligned in the longitudinal direction of the plate. (welded part 15), or as shown in Fig. 4, a nozzle receiving part 16 for spraying cooling liquid directly onto the slab is attached to the plate 11 on the side that is in direct contact with the slab. After welding (welding part 17) in advance and drilling a hole 18 that fits the outer shape of the nozzle receiving part 16 in the plate 12 on the side to be attached to the walking bar in advance, as explained in FIG. Assemble and weld in the same way (welded parts 15 and 1
9) What is configured is provided. 3 and 4 are explanatory diagrams of the cooling plate cut in section at a location having screw holes 20 for attachment to a walking bar.

However, since such cooling plates have welded parts, they are repeatedly exposed to high temperature conditions, and when used, the temperature distribution inside the plate is uneven, which occurs due to the unevenness of the temperature distribution on the surface side that comes into contact with the slab. Cracks may occur in welded parts due to distortion, etc., and because materials with good weldability are selected, they lack wear resistance, high-temperature corrosion resistance, and heat crack resistance, resulting in short service life. It is necessary to have a certain degree of strength in order to prevent the slab from expanding, and therefore, the thickness becomes thick and there are problems in that the cooling effect cannot be sufficiently exerted.

However, in view of the above problems, this invention provides a cooling plate structure that allows the use of materials with excellent wear resistance, high temperature corrosion resistance, thermal conductivity, etc. for the cooling plate. , a cooling plate having a coolant passage that is detachably attached to a bar of a walking bar type secondary cooling device of continuous casting equipment, characterized in that the coolant passage consists of a plurality of circular passages. Located on the cooling plate of the walking bar type secondary cooling device.

This invention will be explained in detail below with reference to embodiments shown in FIGS. 5 and 6.

Figures 5 and 6 are explanatory views of the cooling plate according to this invention, taken in cross section at a location where it has screw holes 20 for detachably attaching it to a walking bar (not shown), in which 1 is a cooling plate. The coolant passage 21, which is a plate, is provided inside the cooling plate 1 by boring circular holes in the longitudinal direction. In Fig. 6, 22 is a through hole for installing a nozzle for spraying cooling liquid directly onto the slab, and 23 is a cooling liquid escape groove cut out in the width direction in the front surface of the nozzle hole. .

In this invention, the wall thickness W between the holes provided in the cooling plate 1 and the wall thickness Y from the surface of the cooling plate 1 that contacts the slab to the inner peripheral surface of the hole are the hole diameter (the arrangement of large and small holes). If the diameter of the small hole is Bmm, it is best to set it at 0.2B to 0.5B, and if it is 0.2B or less,
When drilling a hole with a long drill or the like, the strength of the wall W or Y becomes weak and the drill escapes, making the drilling work difficult. Moreover, if it is 0.5B or more, the thickness of the wall W or Y becomes thicker, and the cooling effect tends to be weakened, but the strength becomes stronger.

In addition, when a hollow part (coolant passage) with a rectangular cross section is bored or welded like in a conventional cooling plate, the temperature distribution on the cast side surface of the cooling plate is as follows.
A temperature gradient of approximately 100°C occurs between the center and the edge of the plate, resulting in an uneven cooling effect, and the bending stress caused by this causes the short side of the hollow section with a rectangular cross section or the spacer to collapse and deform. This will cause a crack. On the other hand, in the case of this invention, the temperature distribution on the casting side surface of the cooling plate is uniform;
Therefore, no bending stress is generated.

As mentioned above, this design does not require welds to form the coolant passages in the cooling plate, and there is no cracking caused by uneven surface temperature on the casting side, so there is no leakage during use. In addition, since the coolant passage consists of a plurality of aligned circular holes, the surface temperature of the casting side is uniform, so bending stress does not occur, and since no welding is required, weldability can be considered when selecting the blank plate. No need to consider, wear resistance,
The base plate of Cr steel, Ni-Cr steel, etc., which has excellent high temperature resistance, or the copper alloy with excellent thermal conductivity is used for the substrate, and the surface that comes into contact with the slab is made of Ni, which has excellent wear resistance and high temperature resistance.
It is possible to use a blank plate with chromium-based plating or Cr-based plating.

As described above, this invention has various advantages and has great industrial effects.

Incidentally, when the cooling plate of this invention is used in a secondary cooling device of a curved type continuous casting equipment, productivity is improved if holes are pre-drilled and then bending is performed.

[Brief explanation of the drawing]

Figure 1 is an explanatory horizontal cross-sectional view of the cooling device showing the installation position of the cooling plate, Figure 2 is an explanatory view of the cooling system used in a vertical continuous casting machine, showing the installation position of the cooling plate, and Figures 3 and 4 are The figure is a horizontal cross-sectional view of a conventional cooling plate.
FIG. 5 is a horizontal sectional view of a cooling plate showing one embodiment of this invention, and FIG. 6 is a horizontal sectional view of a cooling plate showing another embodiment of this invention. 1: Cooling plate, 2: Walking bar, 3,1
3, 21: Coolant passage, 20: Mounting screw hole,
22: Nozzle mounting hole.

Claims (1)

[Scope of utility model registration request] In a cooling plate having a cooling liquid passage that is detachably attached to a bar of a walking bar type secondary cooling device of continuous casting equipment, the cooling plate is an integral type without a welded part, and the cooling liquid passage has a plurality of circular passages. continuous casting equipment, characterized in that a circular passage is formed to satisfy 0.2B≦W≦0.5B, where B is the circular hole diameter and W is the wall thickness between the circular holes. Cooling plate of walking bar type secondary cooling device.