JP3494129B2 - Mold for continuous casting - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a continuous casting mold, and more particularly, a short side frame can be replaced online in a short time to change a slab thickness. Related to the structure. 2. Description of the Related Art In order to change the dimensions of a continuous cast slab slab, a casting mold is prepared by widening a long side frame of a slab cross section and sandwiching a short side frame therebetween. The short side frame is connected to a slab width changing stepping cylinder so that the slab width can be changed by the stroke of the cylinder. The slab thickness is changed by replacing the short side frame of the continuous casting mold. Conventionally, as a technique for replacing the short side frame of a continuous casting mold, there is a continuous casting slab thickness variable mold disclosed in Japanese Patent Application Laid-Open No. H4-222049. This technology has a long-side fixed frame and a long-side movable frame that can be opened and closed by a remote-controlled slab thickness variable mold for continuous casting, and a pair of short-side frames sandwiched between these long-side frames. The side frame is composed of a fixed short side frame connected to the moving device, and a variable short side frame detachably attached to the fixed short side frame and having a short side copper plate fixed thereto. Further, a cooling water passage is formed in the variable short side frame constituting the short side frame, and the supply / drainage passage of the fixed short side frame and the cooling water passage of the variable short side frame are brought into contact with and separated from each other on the frame mating surface. . Further, an engaging portion is provided at a joint portion between the fixed short side frame and the variable short side frame, and positioning is facilitated by the engaging portion. In the above technique, since the short side of the mold has a double structure, the thickness of the short side frame increases in the moving direction of the short side frame, and the moving distance of the short side frame is limited due to the change of the slab width. Receive. Further, a pressing cylinder is required to prevent water leakage from between the two back frames. In addition, there is a risk of foreign matter entering when attaching and detaching the two back frames, and if the pressing cylinder breaks down, water leaks, causing seizure of the copper plate, and in some cases, a large amount of water flows into the mold and water vapor There is a risk of explosion. Furthermore, when changing the high-speed width during casting, the load increases, so that the change width stroke cannot be increased. In order to increase the stroke, it is necessary to increase the width changing stepping cylinder. In addition, since the online time (period) is prolonged as the life of the mold is prolonged, there is a problem that water leakage due to deterioration of the cooling water seal portion of the double structure cannot be avoided. SUMMARY OF THE INVENTION The present invention provides a structure in which the copper plate of the short side frame and the back frame can be easily replaced while being integrated, and the thickness of the slab can be changed online. The purpose is to: According to the present invention, a plurality of short-side frames having different widths are prepared, and each short-side frame has a hook-shaped hook on a rear surface for engaging with a rod tip pin of a stepping cylinder. This hook-shaped hook has a short U-shape on the lower side, and has a cotter that is inserted and removed between the rod tip pin locked inside and the back of the short side frame to prevent the pin and hook from coming off. It is a mold for continuous casting characterized by the following. [0007] The short U-shape on the lower side is a shape comprising a horizontal projecting portion, a hanging portion at the tip thereof, and a short horizontal return portion at the lower end of the hanging portion. The hook and the pin are engaged so as to hold the rod tip pin inside the short U-shape on the lower side. The cotter can move up and down, and is pushed down from above to be inserted between the rod tip pin and the back of the short side frame to prevent the pin and the hook from coming off. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an embodiment of the present invention is shown in FIGS. 1 is a side view of the embodiment, FIG. 2 is a plan view thereof,
FIG. 3 is an explanatory view showing the mounting operation, and FIG. 4 is a detailed view showing the connection of the cooling water pipe. As shown in FIG. 2, the continuous casting mold 1 is fastened by sandwiching a short side frame 10 between a pair of long side frames 2 to form a space having a rectangular cross section.
The molten metal is poured from above, and the slab is drawn down and cast continuously. By loosening the tightening of the long side frame 2 and moving the stepping cylinders 20 and 23 back and forth, the position of the short side frame 10 can be changed and the width of the slab can be changed. On the other hand, to change the thickness of the slab, the short side frames 10 having different dimensions are replaced. The present invention enables the replacement of the short side frame 10 online. The rod end pin 2 attached to the rear end 12 of the stepping cylinder 20 on the rear end 12 of the short side frame 10 is provided.
1 is provided with a hook-shaped hook 13 which is easily locked and fixed. The hook 13 is provided corresponding to at least one of the upper and lower stepping cylinders 20 and 23. In the embodiment, the hook 13 is attached to the upper stepping cylinder 20, and the hook 15 having a U-shaped groove to be engaged with the rod tip pin 24 from above is attached to the lower stepping cylinder 23. The hook-shaped hook 13 has a short U-shape on the lower side, and holds the rod tip pin 21 inside the U-shape.
This is fixed by the cotter 14. The cotter 14 has a taper on the side surface that can be inserted and removed from above, and the cotter 14 can be pushed down from above so that
1 is charged. It is preferable that the rod tip pin 21 has a square cross section at the portion in contact with the cotter 14 so that the rod tip pin 21 is well adapted to the cotter 14. The cotter 14 may be provided with a handle or a mounting tool (not shown) so that the cotter 14 can be manually inserted and removed. FIG. 3 is an explanatory view of the mounting of the short side frame 10, in which the short side frame 10a indicated by the imaginary line is moved obliquely upward from diagonally downward as indicated by the arrow 16 and mounted.
At this time, the rod end pin 21 of the upper stepping cylinder 20 is stopped at a position slightly advanced from the rod end pin 24 of the lower stepping cylinder 23, and the lower rod end pin 24 is attached to the lower hook 15. When engaged, when the rod tip pin 21 of the upper stepping cylinder 20 is retracted, the pin 21 is held inside the hook 13. Next, when the cotter 14 is pressed down, the fixing of the pin and the hook is completed. When the short side frame 10 is detached, the procedure may be reversed. Therefore, attachment and detachment of the short side frame can be extremely easily performed, and the short side can be replaced online. FIG. 4 shows the attachment and detachment of the cooling water pipe. The short side frame 10 has a molded copper plate 31 on the surface 11 and cooling water passages 32 and 33 inside. A mold cooling water hose 34 is attached by a coupling 35. Also, a spray cooling water hose 36 for supplying cooling water for the short side cooling spray pipe 38 is coupled to the coupling 3.
Attach by 7. The mold fixed cover 42 and the mold movable cover 41 are attached thereafter. By installing and removing the above cooling water piping, the cooling water seal of the short side frame does not need to be removed and mounted when the short side frame is replaced, so no special consideration is required for replacement of the short side frame, It is always kept in perfect condition. According to the present invention, the stepping cylinder and the short side frame are formed by inserting a cotter that can be inserted from the upper end side of the mold by using a hook structure at a joint portion of the short side frame of the continuous casting mold with the width changing stepping cylinder. Since the joint is fixed, the mold thickness can be easily and online changed in a short time. In addition, the short side frame has an integrated structure, and the cooling water and spray cooling water for cooling the copper plate of the short side frame are connected by a hose at the upper end of the mold after the short side frame is changed, so the short side frame is supplied. There is no concern about poor sealing of the cooling water between the front and back surfaces of the side frame, and the short side frame can be made thin. Accordingly, the weight of the short side frame can be reduced, and the handling becomes easier. In the embodiment, the short side frame replacement time is 15 minutes, which is much shorter than the conventional 90 minutes. According to the present invention, the connection between the short side frame of the continuous casting mold and the stepping cylinder has a hook structure, and has a fixed structure that can be easily attached and detached. Thus, the thickness of the continuous cast slab can be changed in a short time.

[Brief description of the drawings] FIG. 1 is a side sectional view of an embodiment. FIG. 2 is a plan view of the embodiment. FIG. 3 is an operation explanatory diagram of the embodiment. FIG. 4 is a detailed diagram of pipe installation of the embodiment. [Explanation of symbols] 1 Mold 2 Long side frame 10, 10a Short side frame 11 Surface 12 back 13 Hook hook 14 Cotta 15 hooks 20 Upper stepping cylinder 21 Rod end pin 22 rod 23 Lower Stepping Cylinder 24 Rod end pin 31 Molded copper plate 32, 33 cooling water channel 34 Mold cooling water hose 35 Coupling 36 Cooling water hose 37 Coupling 41 Mold movable cover 42 Mold fixing cover

Claims (1)

(57) [Claims 1] A plurality of short side frames having different widths are prepared, and a hook shaped hook which is engaged with a rod tip pin of a stepping cylinder is attached to each short side frame on a back surface. The hook-shaped hook has a short U-shape on the lower side, and is provided with a cotter that is inserted and removed between the rod tip pin locked inside and the back of the short side frame to prevent the pin and the hook from being detached. And a mold for continuous casting.