JPS62134115A - Coiler drum for hot rolling mill - Google Patents

Abstract

PURPOSE:To reduce winding flaw, to produce a coil of good quality at high speed and to obtain a drum of long service life by dividing the segment in the shell length direction in the coiler drum composed by a drum shaft, segment, slide key, etc. CONSTITUTION:A rod 5 and slide key 6 are linked by a cotter, the rod 5 and cotter are linked in the drum shell length direction by a hydraulic cylinder 10, to expand and contract the segment 2 at the drum neck side and segment 3 at the drum tip side. The segments 2, 3 receive the force in not only the radial direction of the drum but also the direction of drum shell length by the movement of a slide key 6. And at the drum neck side, it is received by a drum shaft 4 via a liner 8 and at the drum tip side by a stopper 9 via the liner 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a coiler drum for a hot rolling mill, and particularly to a segment structure suitable for preventing the occurrence of winding scratches.

[Background of the invention]

As described in Japanese Utility Model Application Publication No. 59-143517, the conventional device prevents external leakage in the longitudinal direction of the segment support portion and the mandrel shaft that engages with the support portion to expand and contract the segments. Cooling water holes were provided. However, in this case, water holes were provided in the segments and the mandrel shaft, and cooling water was passed through, which increased processing and equipment costs.

[Purpose of the invention]

An object of the present invention is to reduce winding scratches that occur during winding of a light-rolled coil, to produce high-quality coils at high speed, and to provide a drum with a long life.

[Summary of the invention]

As shown in Figure 3, the segments of the coiler drum for hot rolling mills are thermally deformed during strip winding, forcing the sliding part of the expansion mechanism to have a large gap or reducing the holding part. , which is enlarged during use and deteriorates the seating of the segments (the roundness of the drum), causing slip scratches on the inner layer of the winding coil. Furthermore, thermal deformation causes a heat crank to occur in the segment. Since the amount of thermal deformation increases as the segment becomes longer, dividing the segment reduces the deformation and further solves the problems caused by division, making it more practical.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Figure 1 is a cross-sectional view of the drum in the lengthwise direction of the drum.
is a segment divided into two in the longitudinal direction of the drum; 2 is a segment on the drum neck side, 3 is a segment on the front end of the drum, 4 is a drum shaft, and 5 is connected to the hydraulic cylinder 10 by a rod. 6 is a slide key that supports the expansion/contraction guide, receiving the seaming force, and spreading the segments due to centrifugal force. 7 indicates a pressure receiving liner. FIG. 2 is a radial cross-sectional view of FIG. 1. The segments divided into four circumferences are provided with lagging as shown in FIG. The rod 5 and the slide key 6 are connected by a clasp 13.

The rod 5 and the lever 6 are moved in the longitudinal direction of the drum body by the hydraulic cylinder o, and the segments 2 and 3 are expanded and contracted. Due to the movement of the slide key 6, the segments 2.3 receive force not only in the radial direction of the drum but also in the lengthwise direction of the drum body; It is received by a stopper 9 via a liner 8. In this example, the stopper 9 is a nut cut into the tip of the drum shaft 4. In addition, the movement mechanism of the slide key 6 also includes the slide key 6 and the segment 2.
．． Any mechanism that allows the parts 3 to move relative to each other is sufficient, and there is no need to use the tipper 11 as in this example.

FIG. 4 conceptually shows thermal deformation in the longitudinal direction of the drum body. The deformation is expressed by an N-dimensional equation of the length of the segment, and when both ends of the segment are restrained, the amount of deformation is δfactor when the segment is integrated, and δ2 when it is divided into two. Assuming N=2, it can be seen that the thermal deformation δ2 of the divided segment is 1/4 compared to 61 in the case of a single piece. From this, the gap of the sliding part is 1
/4 can be achieved.

Figure 5 shows details of the joint of two-part segments h2 and 3,
The figure shows a radial section of FIG. The divided segments must be connected because they must operate simultaneously when expanding and contracting. If the gap between the split surfaces is a straight line, streaks will appear in the longitudinal direction of the strip when the strip is wound, and a considerable amount of damage will occur to the strip. Therefore, this problem can be prevented by connecting and splitting as a lagging type dovetail. The present invention has a two-stage wedge mechanism, and each divided segment is supported by two adjacent slide keys 6, and a pressure-receiving liner 7 is provided in place of the slide keys 6 at the center. When supported by two slide keys, since the length of the segment is short, there is no need to require an abnormal gap for the amount of thermal deformation, and the key can be used sufficiently against centrifugal force. In addition, the central part sufficiently compensates for the strength of the divided parts of the segments, and since the maximum seaming force is always applied, it is made a large pressure-receiving surface to reduce surface pressure, thereby extending the life of the drum, including not only the segments but also the drum shaft. can be extended.

Another embodiment of the present invention will be described. The general structure is the same as the difference example 1 described above, but the details of the joint of the two-part segment 2°3 are shown in the seventh @. In the present invention, a gap is provided between the segment dividing planes, but as described above, if the gap is a straight line, it will damage the strip, so lagging is required. Furthermore, when the two-part segment expands or contracts the drum,
Segments 2 and 3 are connected by a connecting pin 12 for simultaneous operation. The connecting pin 12 also serves to maintain a constant gap between the segments 2 and 3. In this way, when a gap is provided between the segment dividing surfaces, thermal deformation of the segments occurs not only in the drum radial direction but also in the barrel length direction. In other words, in an integral segment and a divided segment where the gap between the divided surfaces is zero, the trunk length direction is considered to be constrained, and the radial strain ε, is: ε,=(1+ν)α・ΔT... ...■Y; Poisson's ratio α of the segment material; linear expansion coefficient ΔT of the segment material; expressed as temperature rise of the segment. On the other hand, if there is a gap between the split planes, the segment will undergo thermal deformation in the longitudinal direction and radial direction, so the radial distortion ε,' is cr' = α・ΔT ・・・・・・■
It is expressed as Now, assuming that the Poisson's ratio of the material of the segment is ν=0.3, the radial thermal deformation is reduced by about 30% by providing a gap between the segment dividing surfaces. By reducing the amount of thermal deformation, it is possible to prevent adverse effects on the strip and the drum structure caused by thermal deformation.

〔Effect of the invention〕

According to the present invention, a high-quality coil can be produced without causing winding scratches in the wound coil, has excellent centrifugal force resistance, and can be used up to twice the winding speed of conventional coils.

[Brief explanation of drawings]

Fig. 1 is a sectional view in the trunk length direction of the segment portion of a segmented coiler drum according to an embodiment of the present invention, Fig. 2 is a radial sectional view of Fig. 1, and Fig. 3 is a conventional coiler drum segment length sectional view. 4 is a conceptual diagram of thermal deformation in the longitudinal direction of the drum body, and FIG. 5 is a detailed diagram of the two-part segment joint.
6 is a radial sectional view of FIG. 5, and FIG. 7 is a detailed view of the two-part segment joint. 2.3...Two-part segment, 4...Drum shaft.

Claims (1)

[Scope of Claims] 1. A coiler drum for a hot rolling mill, comprising a single drum shaft including expandable and contractible segments, slide keys, etc., wherein the segments are divided in the longitudinal direction of the body. 2. A coiler drum for a hot rolling mill according to claim 1, wherein the slide key on the load surface of the divided portion of the segment is removed to widen the pressure receiving surface. 3. A drum according to claim 1, characterized in that wedge-shaped dovetails are provided between the segments to serve both for connection during expansion and contraction and for lagging to prevent division into strips. Koiradrum.