JPH0219721B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a rope having an asymmetrical cross-sectional shape, such as a scalene chevron rope or a scalene chevron rope.

[Prior art]

Figure 1 shows the conventional single-piece rolling method to obtain a scalene and uneven thickness chevron-shaped wire by sequentially forming the wire in a roll mold, but since the cross-sectional shape is asymmetrical, the rolling
Both cooling is unstable and tends to bend left and right. Furthermore, since the unit weight is small, the rolling efficiency is also low. Therefore, a method is proposed in which two such asymmetrical angle-shaped ropes are combined into a symmetrical channel shape, rolled, cooled, and straightened in a symmetrical shape, and then gas-cut off-line to produce the desired shape. It has also been taken. However, gas cutting not only causes cutting loss but also bends the rolled material due to thermal strain and requires realignment, so it is not very advantageous in terms of cost and man-hours.

[Purpose of the invention]

This invention was proposed in view of the above circumstances, and its purpose is to enable efficient cutting online, improve the bending during cutting, eliminate the need for re-straightening after cutting, and improve production efficiency. The object of the present invention is to provide a method of manufacturing an asymmetrical rope that can achieve the following.

[Structure of the invention]

The method for manufacturing an asymmetrical steel rope according to the present invention involves combining two steel wires with asymmetrical cross-sectional shapes to form a symmetrical shape, hot rolling them, and then cold cutting them in the longitudinal direction to produce two asymmetrical steel wires. In this method, a notch groove is first formed in the center of a symmetrical cross-section steel during hot rolling, and after cooling, the flange of the symmetrical cross-section steel is restrained by the roll hole shape to prevent bending. Lightly reduce the web near the intersection with the flange, and have a slit knife in the center of one of the roll holes, and the other roll hole does not touch the shape near the part corresponding to the slitting knife. The notched groove portions are cut using the roll hole mold to obtain two asymmetrically shaped ropes.

〔Example〕

The present invention will be described below based on an illustrated embodiment. This is scalene unequal thickness chevron rope 250×90
×10/15, and the web W is rolled down in a symmetrical, flat, inverted W-shaped cross-section using a hole shape as shown in Fig. The rope is formed into a symmetrical cross-sectional rope 1 that stands upright at the center and has a V-notch groove 2 in the center.

Here, this shape rope 1 is cut in the longitudinal direction at its center, but it is desirable that the corners of the web W to be cut have a right angle, so the angle a of the V-notch groove 2 is 50°. (See Figure 3). Furthermore, the groove depth is such that the cutting thickness t is 1.0 mm.

After cooling the shape wire 1 and straightening it with a roller straightener, as shown in FIG. It has a rolling part 4 that can lightly roll down the shape, and has one central slit knife 3 of the roll hole type, and the other roll hole type has a part that is not in contact with the shape near the part corresponding to the slitting knife 3. The V-notch groove 2 is cut from the opposite side using a roll hole type. The cut 1mm section will have a chamfered shape of exactly 45°. Here, the rolling part 4 is provided to eliminate the problem that the material opens left and right after cutting due to elongation of the cut surface and residual stress. At the same time, the material is rolled down, which prevents the material from bending from side to side.

Note that the rolling reduction rate or rolling width may be changed in order to improve left-right bending.

Further, the method of rolling the symmetrical cross-section steel is not limited to the embodiment shown in FIG. 2, and various other rolling methods may be employed, such as a rolling method in which the steel is turned upside down.

With this method, the rolling efficiency has increased from 60T/H and offline press straightening ratio of 70% in the case of conventional single groove rolling to 120T/H.
H. Press straightening ratio improved to 8%.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to efficiently cut the steel on-line, and the bending during cutting is improved, so that re-straightening after cutting is almost unnecessary, and the production efficiency of asymmetrical steel is greatly improved.

[Brief explanation of drawings]

Figures 1A, B, C, D, and E are process diagrams showing the conventional manufacturing method for scalene ropes, Figure 2A,
B, C, and D are process diagrams showing the hot rolling stage of the manufacturing method according to the present invention, FIG. 3 is a sectional view showing a similar symmetrical cross-sectional steel, and FIG. 4 is a front view showing the cutting method. It is. 1... Symmetrical cross-section rope, 2... V-notch groove, 3...
...knife, 4...compression part.

Claims (1)

[Claims] 1 In the method of combining two shaped steels with asymmetric cross-sectional shapes into a symmetrical shape, hot rolling them, and then cold cutting them in the longitudinal direction to obtain two asymmetric shaped steels, first, in the hot rolling stage, A notch groove is formed in the center of the symmetrical cross-section rope, and after cooling, the roll hole mold restrains the flange of the symmetrical cross-section rope so that it does not bend, and the web near the intersection with this flange is lightly rolled down. and having a slitting knife in the center of one of the roll holes,
A method for manufacturing an asymmetric shape steel, characterized in that the other roll hole shape cuts the notched groove portion with the roll hole shape that is not in contact with the shape wire in the vicinity of a portion corresponding to the slitting knife portion.