JPS6390337A - Width changing device for width variable mold apparatus - Google Patents

Abstract

PURPOSE:To reduce the cost of equipment and to improve the quality of cast slab by arranging turnbuckles at the gaps between mold at long wall sides and at short wall sides to shift the mold frames at the short wall sides and positioning them through a distance piece. CONSTITUTION:One pair of the turnbuckles 8 are arranged at upper and lower positions of the short wall side core block 5 and their ends are connected by pin on the block face of the mold frame 2 at the short wall side. Further, the base end is fixed to a shaft part of tie-bolt 9 connecting the mold frame 1 at the long wall side. On the other side, the distance piece 10 is arranged at the gap between the supporting piece 11 of mold frame 1 and the block face of mold frame 2 to shift the mold frame 2 and execute the positioning. In this way, as the mechanism is simplified, the cost of equipment is reduced, and as an electromagnetic stirrer is possible to set even at the short wall side, the quality of cast slab is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a width changing device for a variable width molding device in a continuous casting machine.

[Prior art]

As shown in Fig. 4, the variable width molding device includes a pair of long-side mold frames 1 in which the long-side mold copper plates IA are incorporated in the front surface, and a pair of long-side mold frames 1 in which the short-side mold copper plates 2A are incorporated in the front surface. A mold is formed from the short-side mold frames 2, and the width of the slab is changed by moving the pair of short-side mold frames 2 forward and backward relative to each other.

In such a variable width molding device, conventionally, an electromagnetic stirring device 4 is attached to the back side of a pair of long side mold frames 1, and a width changing drive device such as a worm jack screw is attached to the back side of a pair of short side mold frames 2. Device 4 is installed.

This configuration has the advantage that an automatic or manual width changing drive device can be incorporated.

[Problems to be solved by this invention]

However, although it has the above-mentioned advantages, it also has the following problems.

(i) Remote control is possible by using a worm screw or hydraulic cylinder for the width changing drive device, but the device size is large (because of space constraints, the electromagnetic stirring device can only be installed on the long side). Not installed.

Therefore, the molten steel flow stagnates in a part of the short side corner, and nonmetallic inclusions accumulate, resulting in deterioration of the quality of the slab in a part of the corner.

(11) The width changing mechanism becomes complicated and the equipment cost becomes extremely high.

This invention was proposed to solve these problems.The purpose of this invention is to have a simple mechanism and operation, low equipment cost, installation in a narrow space, and a short-side core block of an electromagnetic stirrer. An object of the present invention is to provide a width changing device for a variable width molding device, which allows the arrangement of width variable mold devices.

[Means and effects for solving the problem] The width changing device of the variable width mold device according to the present invention has a turnbuckle on the back surface of the short side mold frame, the base end of which is fixed to the long side mold frame. It is constructed by connecting the tips and abutting a distance piece, and by rotating the turnbuckle, the short side mold frame is moved to change the slab width, and positioning is performed using distance pieces of various lengths. This is how it was done.

〔Example〕

The present invention will be described below based on an illustrated embodiment. Regarding parts that are the same as or equivalent to the previous version,
The same symbols are given.

As shown in Figures 1 to 3, the variable width molding device has a short side core block 5 on the back side of the short side mold frame 2, which has a width slightly smaller than that of the frame 2 and has a sufficient thickness T. At the end of the electromagnetic stirring device 4 that is fixed and attached to the long side mold frame 1 via the support member 6,
An extension portion 4A extending to the short side core block 5 and a protrusion portion 4B toward the short side core block 5 are formed, and molten steel flow is also generated on the short side side due to the short side core block 5 and the protrusion portion 4B. A slab with good surface quality and internal quality can be obtained without non-metallic inclusions being deposited on some corners.

In the variable width molding device having such a configuration, the width changing devices are arranged in a portion where the magnetic flux density is low, that is, above and below the short side core block 5.

The width changing device consists of a turnbuckle 8 and a distance piece lO, and the turnbuckles 8 are arranged in pairs on the top and bottom of the short side core block 5, respectively, and their tips are pinned to the back surface of the short side mold frame 2. The base ends are pivotally attached to the shafts of tie bolts 9 that connect the pair of long side mold frames 1.

By rotating the turnbuckle 8, the short side mold frame 2 is moved to change the slab width, and positioning is performed using a pair of distance pieces IO. This distance piece IO is arranged between the support piece 11 attached to the long side mold frame 1 and the back surface of the short side mold frame 2, and pieces of different lengths are prepared and each Make it compatible with one width.

The weight of the frame 2 and the copper plate 2A on the short side can be reduced by providing a key 12 protruding from the side of the molded copper plate IA on the long side, and inserting this key 12 into the key groove 13 on the side of the molded frame 1 on the short side.
It is fitted and supported.

Further, the molding device is fixed to the oscillation table 14 via the ears IB of the long side mold frame 1, and extends from the oscillation table 14 to the long side mold frame 1 and the short side mold frame 2, respectively. A side water supply and drainage jacket 15 and a short side water supply and drainage hose 16 are provided.

〔Effect of the invention〕

As described above, according to the present invention, since the short side mold frame is moved by the turnbuckle and positioned by the distance piece, the following effects are achieved.

(1) Mechanism and operation are simple.

(11) Equipment costs are lower.

(iii) Can be installed in a very narrow space. By kneading, the short side block of the electromagnetic stirrer can be placed in the short side mold frame, making it possible to obtain a slab with good surface properties and internal quality.

Gv) Does not affect the reduction of magnetic force.

[Brief explanation of the drawing]

Figure 1, Figure 2, and Figure 3 are a plan view and a front view of a variable width molding device according to the present invention. Fig. 1 is a sectional view taken along line I-I, and Fig. 4 is a plan view showing a conventional variable width molding device.

Claims (1)

[Claims] (1) In a variable width molding device in which an electromagnetic stirring device is attached to the back surface of a pair of long side mold frames, and a pair of short side mold frames can move forward and backward relative to each other, the back surface of the short side mold frames. A width changing device for a variable width mold device, characterized in that the tip of a turnbuckle whose base end is fixed to the long side mold frame is connected to the mold frame on the long side, and a distance piece is brought into contact with the turnbuckle.