JP3062840B2 - Slab width reduction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slab width reduction method.

[0002]

2. Description of the Related Art Conventionally, there is a method disclosed in Japanese Patent Publication No. 50807/1990 as a method for forming a slab under width reduction.

FIG. 3 shows an example of a width reduction device for carrying out the above-mentioned method. In the drawing, reference numeral 1 denotes a housing formed so that a slab 7 can be inserted through a central portion, and 2 denotes left and right supports in the housing 1. A substantially vertically extending crankshaft,
Reference numeral 3 denotes a slider whose base end is fitted to the eccentric portion 2a of the crankshaft 2, and 6 denotes a slab 7 insertion position S of each slider 3.
The width reduction heads 8 fitted to the housing 1 are positioned at the side of the slab 7 of each width reduction head 6 so that the width reduction heads 6 can be slid in the direction of approaching and separating from the slab 7.
Left and right dies 9 attached to the side end faces are motors for rotating the crankshaft 2 via a speed reducer (not shown). The motor 9, the crankshaft 2 and the slider 3 control the width reduction drive mechanism 10. Has formed.

A worm wheel 11 rotatably supported by the left and right sliders 3 so as not to move in the axial direction.
Is screwed with a screw portion 5 formed at an intermediate portion in the longitudinal direction of the screw 4 extending toward the slab 7 insertion position S side, meshes with the worm wheel 11, and is rotatably supported by the slider 3. By rotating the worm 12, the screw 4 approaches or separates from the slab 7 insertion position S.
2, the worm wheel 11 and the screw 4 form a mold position adjusting mechanism 13.

Further, a spherical portion 14 formed at the end of the screw 4 at the side of the slab 7 insertion position S side is provided on the width reduction head 6.
Is formed, and the spherical portion 14 and the spherical seat 15 are brought into contact with each other by a counter balance cylinder 16 that connects the width reduction head 6 and the housing 1.

[0006] The left and right dies 8, 8 are parallel parts 17 extending in parallel to the conveying direction of the slab 7 (the direction of arrow B).
And the upstream of the slab 7 in the transport direction A
And an inclined portion 18 extending toward the side and gradually approaching the slab 7.

Hereinafter, FIG. 4 to FIG.
The procedure for implementing the width reduction method of a slab disclosed in Japanese Patent No. 0807 using a width reduction device shown in FIG. 3 will be described.

When preforming the tip of the slab 7,
The eccentric portions 2a of the left and right crankshafts 2 are located at the bottom dead center (the position where the eccentric portion 2a is closest to the slab 7 insertion position S, the closest position between the left and right dies 8, 8). Is rotated to adjust the relative position of the width reduction head 6 with respect to each slider 3 so that the distance between the parallel portions 17, 17 of the left and right dies 8, 8 is reduced to the width of the slab 7 before width reduction molding. set slightly wider spacing W ₁ than the dimension W _0, then after the leading end of the slab 7 was inserted through the distal end portion of the slab 7 in the housing 1 so as to be positioned between the left and right mold 8,8 (4 ), And rotate the crankshaft 2.

When the crankshaft 2 rotates, the eccentric portion 2a moves from the bottom dead center to the top dead center (the position where the eccentric portion 2a is farthest from the insertion position S of the slab 7, the left and right dies 8,
8), the worm 12 is rotated to rotate the screw 5 (see FIG. 5), and the width reduction head 6 is moved to the slider 3 in the first stage. When the eccentric part 2a moves from the top dead center to the bottom dead center when the eccentric part 2a moves from the top dead center to the bottom dead center by moving the slab 7 to the insertion position S side by the forming reduction allowance, the tip of the slab 7 presses the width reduction press. shaped distal end of the slab 7 is preformed to the width W ₂ (see Fig. 6).

Further, when the crankshaft 2 is further rotated and the eccentric portion 2a moves from the bottom dead center to the top dead center, the width reduction head 6 is lowered with respect to the slider 3 in the second-stage preforming as described above. the cash is only moved to the slab 7 inserted position S side, when the eccentric portion 2a moves toward the bottom dead center from the top dead center, than the width W ₂ of the distal end portion of the slab 7 by the left and right mold 8,8 Preform to narrow dimensions.

[0011]

[0008] However, in the width reduction press method slab described above, prior to width reduction press molding of the slab 7, in order to set the left and right mold 8,8 to spacing W _1, the width reduction press apparatus An idle state occurs where the user does not perform actual work.

In addition, in order to adjust the distance between the left and right dies 8, 8 before adjusting the width, the worm 12 must be turned to drive the screw 5 each time. Motor not shown,
The mold interval adjusting mechanism 13 composed of the worm 12, the worm wheel 11, the screw 5, and the like is greatly consumed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to eliminate the idle state of the width reduction device and to suppress the consumption of the mold position adjusting mechanism.

[0014]

SUMMARY OF THE INVENTION The present invention relates to a left and right mold for reducing the width of a slab, a left and right width reduction drive mechanism for moving the left and right dies closer to and away from each other, and a mold and a width reduction drive mechanism. When performing width reduction of a slab by a width reduction device equipped with a mold position adjustment mechanism that adjusts the relative position in the slab width direction, the distance between the left and right dies is set at the closest position of the left and right dies. The width of the slab is set to be smaller than the width of the slab before the width reduction by the die position adjustment mechanism, then the left and right dies are separated from each other by the width reduction drive mechanism, and the slab is inserted between the left and right dies. The left and right dies are brought closer to each other by the width reduction drive mechanism, the slab is reduced in width by the left and right molds, and the first stage is formed. Thereafter, while the slab is stopped, the left and right dies are reduced by the width reduction drive mechanism. Move away and left Until the mold is brought into contact again slab and away from the slab, the left and right mold to width reduction molded sequentially slab is moved to the slab side by the mold position adjusting mechanism.

[0015]

When the width reduction of the slab is performed, the distance between the left and right dies is set by the die position adjustment mechanism so that the distance between the left and right dies is smaller than the width of the slab to be width reduced. In advance, then, the left and right molds are separated from each other by the width reduction drive mechanism, the slab is inserted between the left and right molds, and the left and right molds are brought closer to each other by the width reduction drive mechanism, and the slab is reduced in width. First stage molding is performed.

Further, while the slab is stopped, the left and right dies are moved toward and away from each other by the width reduction drive mechanism, and the left and right dies are separated from the slab until they come into contact with the slab again. The slab is moved to the slab side by the reduction allowance by the mold position adjusting mechanism, and the left and right dies are brought close to each other by the width reduction drive mechanism to sequentially perform the width reduction of the slab.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show the procedure of the method for reducing the width of a slab according to the present invention. In the drawings, the portions denoted by the same reference numerals as those in FIGS. 3 to 6 represent the same components.

In this embodiment, since the width reduction device for performing width reduction molding of the slab 7 has the same configuration as that shown in FIG. 3, the description of the structure of the width reduction device is omitted.

When the tip of the slab 7 is preformed by the method of reducing the width of the slab according to the present invention, the mold position adjusting mechanism 13 is used while the eccentric portion 2a of the crankshaft 2 is located at the bottom dead center. The parallel parts 1 of the left and right dies 8, 8
The width W of the slab 7 to be formed by the width reduction of the width of the slab 7, 17
It is set to be the interval width W ₂ in anticipation of the reduction margin narrower first stage preforming than ₀ (see FIG. 1).

At this time, the tip of the slab 7 is
The slab 7 is kept on standby so as to be located on the upstream side A in the slab 7 transport direction with respect to the parallel portions 17 and 17 of the slab 7.

Next, the crankshaft 2 is rotated, and the eccentric portion 2a approaches from the bottom dead center to the top dead center with the rotation of the crankshaft 2, so that the gap between the dies 8, 8 is reduced in width. Once wider than the width W ₀ of the slab 7 to be parallel portion 17 of the distal end portion of the slab 7 is a mold 8,8,
The slab 7 is moved to the downstream side in the slab 7 transport direction so as to be located between the slabs 17 (see FIG. 2).

When the eccentric portion 2a starts to move toward the bottom dead center past the top dead center by rotating the crankshaft 2, the dies 8, 8 are moved as shown by a two-dot chain line in FIG. The slab 7 is subjected to width reduction molding by the dies 8, 8 so as to be close to each other, and the leading end of the slab 7 is formed to have a width dimension W ₂ (see FIG. 2).

Further, while the slab 7 is stopped, the crankshaft 2 is rotated to move the eccentric portion 2a from the bottom dead center to the top dead center. 8 and 8 are moved toward the slab 7 insertion position S by the pressing allowance of the second-stage preforming, and when the eccentric portion 2a moves from the top dead center toward the bottom dead center, the slabs are moved by the right and left dies 8 and 8. 7
To preformed narrow dimensions of the distal end portion than the width W ₂ of the.

As described above, when preforming the slab 7, the slab 7 is kept stopped after the second-stage preforming.

The gap between the dies 8, 8 is adjusted by adjusting the dies 8, 8.
This may be performed until the slab 7 is separated from the slab 7 and contacts the slab 7 again.

As described above, in the present embodiment, the interval between the parallel portions 14, 14 of the left and right dies 8, 8 is set at the bottom dead center of the crankshaft 2 in consideration of the reduction allowance of the first-stage preforming. is set to W _2, since the width reduction forming the tip of the slab 7, it is possible to improve the working efficiency of the width reduction device to eliminate the idle width reduction device and the mold position adjusting mechanism Since the number of operations of the mold 16 is reduced, the consumption of the mold position adjusting mechanism 16 can be suppressed.

The present invention is not limited only to the above-described embodiment, but includes performing width reduction on a slab using an apparatus other than the width reduction apparatus shown in FIGS.
It goes without saying that various changes can be made without departing from the spirit of the present invention.

[0029]

As described above, according to the slab width reduction method of the present invention, the distance between the left and right dies is set to be smaller than the width of the slab to be width-reduced at the closest position of the dies. By setting and performing the width reduction of the slab, the idle state of the width reduction device can be eliminated, the working efficiency of the width reduction device can be improved, and the consumption of the mold position adjustment mechanism can be controlled. It can provide an excellent effect that it can.

[Brief description of the drawings]

FIG. 1 is a plan view showing a slab forming procedure by a slab width reduction method of the present invention.

FIG. 2 is a plan view showing a slab forming procedure by a slab width reduction method of the present invention.

FIG. 3 is a plan view showing an example of a slab width reduction device.

FIG. 4 is a plan view showing a slab forming procedure by a slab width reduction method disclosed in Japanese Patent Publication No. 2-50807.

FIG. 5 is a plan view showing a slab forming procedure by a slab width reduction method disclosed in Japanese Patent Publication No. 2-50807.

FIG. 6 is a plan view showing a slab forming procedure by a slab width reduction method disclosed in Japanese Patent Publication No. 2-50807.

[Explanation of symbols]

7 slab 8 mold 10 width reduction mechanism 13 mold position adjusting mechanism W ₀ width W ₁ gap W ₂ width

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-38561 (JP, A) JP-A-8-224605 (JP, A) JP-A-3-297502 (JP, A) JP-A-2- 255203 (JP, A) JP-A-2-169112 (JP, A) JP-A-2-55607 (JP, A) JP-A-61-245931 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 15/00 B21B 1/02

Claims (1)

(57) [Claims] 1. A left and right mold for reducing the width of a slab,
A width reduction device including a left and right width reduction drive mechanism for moving the left and right molds closer to and away from each other, and a mold position adjustment mechanism for adjusting a relative position of the mold and the width reduction drive mechanism in the slab width direction. When performing width reduction molding of the slab, at the closest position of the left and right molds, the interval between the left and right molds is set to a dimension smaller than the width dimension of the slab before width reduction molding by the mold position adjustment mechanism, and then The left and right molds are separated from each other by the width reduction drive mechanism, and the slab is inserted between the left and right molds.The left and right molds are brought closer to each other by the width reduction drive mechanism, and the width of the slab is reduced by the left and right molds. After performing the first-stage molding, while the slab is stopped, the right and left dies are separated by the width reduction drive mechanism, and the left and right dies are separated from the slab and contacted with the slab again. Mold position adjustment mechanism Width reduction method slab characterized by a more wide pressure molding sequentially slab by moving the left and right mold to slab side.