JPS6117325A - Method and device for coiling metalic plate - Google Patents

Abstract

PURPOSE:To prevent the generation of a top marking by performing a coiling after thinning toward the tip with pinching only the tip part of a metallic plate by a press device in the fore step of the coiler of a metallic plate. CONSTITUTION:The tip of a steel plate 1 is detected by a steel plate detector 6 and the plate passing speed of the steel plate 1 is measured by an accelerometer 7 and a tracking is performed with calculating the ever-changing position of the tip of the steel plate 1. When it reaches the prescribed position, a motion command is placed on a driving device 5. Accordingly press dies D1, D2 are moved with synchronizing with the speed of the steel plate 1, and with rolling reduction of the tip part of the steel plate 1 the tip part thereof is thinned with the inclination. The press dies D1, D2 are then returned to the original position with their separation, on the other hand the steel plate 1 is coiled on the mandrel 2 of a coiler according to the regular method.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method and apparatus for winding a metal plate such as a hot rolled steel plate.

[Technical background of the invention and its problems]

When winding a metal plate, such as a steel plate, so-called top marks may occur. To explain this with reference to FIGS. 8 and 9, at the beginning of winding, in order to wind the steel plate on the mandrel 2, the steel plate is rolled by the rack roll 3.
As a result, the tip surface of the steel plate 1 becomes a step, and a depression is formed on the surface of the second and subsequent rolls corresponding to the step position, O remains as a top mark TM (see also Figure 6) Since this top mark reduces quality and product value, the following two methods have conventionally been adopted to eliminate it. One of them is the 10th
As shown in the figure, it is a hydraulic step control method.
The conventional air-driven wrapper roll 3 is replaced with a hydraulic drive system to improve responsiveness and separate the wrapper roll 3 from the steel plate 1 when the step at the tip of the steel plate 1 reaches the wrapper roll 3 position. be. However, in order to wrap, at least the first part of the second roll must be pressed down and removed, so even if the top marks after the second roll can be removed, it is not effective in preventing the first top mark. There is no. Moreover, the equipment cost is extremely high, making it impractical.

Another method is to use a top markless mandrel 50 shown schematically in FIG. This mandrel 5
For example, when the four-divided segments 51, 51, etc. are held by the spring 52, and the second winding covers the tip end surface of the steel plate 1, the spring 52 is moved together with the corresponding segment 51 to the thickness of the steel plate 1. The tip end of the steel plate 1 is bent while contracting by the same amount, thereby reducing the contact pressure between the edge of the tip face of the steel plate 1 and the surface of the second roll.

Although this method is inexpensive in terms of equipment cost, it is limited to the range of sheet thicknesses in which it is effective, and is not suitable for winding materials of various thicknesses.

[Purpose of the invention]

An object of the present invention is to provide a method for winding a metal plate, which solves the above-mentioned conventional problems, can reliably prevent the occurrence of top marks on various metal materials without limiting the thickness of the metal plate, and has low equipment costs. [Summary of the Invention] The method of the present invention to achieve this object is to clamp only the leading end of the metal plate to a press device at the front stage of a metal plate winder. The apparatus of the present invention is characterized in that the thickness is thinned toward the tip and then the winding is performed.
A play rolling device comprising a pair of press dies provided oppositely on both surface sides of a metal plate passage, and at least one of the press dies can freely approach and separate from the metal plate;
A tip tracking device is provided at an upstream position of the press rolling device and detects the timing when the tip of the metal plate reaches the position of the rolling press device, and the rolling press device receives a metal plate tip arrival signal from the tip tracking device. In response to this, the press dies are moved closer to each other from a separated state to press-roll only the tip end of the metal plate into a thin tip.

The main point of the present invention is to press-roll the tip end of the metal plate into a thinner shape before winding.

As a result, there is substantially no or less level difference on the front end surface of the metal plate, and the generation of top marks during winding is prevented.

Furthermore, even if the thickness of the metal plate is changed, if the distance between the press dies is kept constant, a constant top mark prevention effect can always be obtained. Furthermore, the wrapping of the metal plate is done before.
Since the leading end is thinned, there is no possibility that the second roll will be ineffective as in the first conventional method.

Moreover, since it can be dealt with by simply adding a new relatively simple device without having to modify the winding machine, the equipment cost is low, which is an advantage. The invention will be explained using specific examples shown in FIGS. 1 to 5.

A basic example of the present invention is shown in FIGS. 1-3.

The hot rolled steel sheet 1 that has passed through the rolling machine (not shown) is shown above.

According to the present invention, a press rolling device P is used at the front stage of the winder. As shown in the figure, one side is a press die D1 having a surface parallel to the sheet passing path, and the other side is a press die D2 having an inclined surface approaching the sheet passing path on the tip side. In addition, press die D1. As shown in FIG. 2, D2 approaches the steel plate 1 while moving forward (towards the winding machine) according to the transfer speed of the steel plate 1, and then moves away from the steel plate 1 and returns to the rear. On the other hand, for example, a steel plate 1 is installed at an appropriate position on the exit side of the rolling mill.
a steel plate detector 6 to detect the tip of the steel plate 1; an accelerometer 7 on the pinch roll 4 to detect the transfer speed of the steel plate 1; A tracking device is set up in the eaves.

In such equipment, the tip of the steel plate 1 is detected by the steel plate detector 6, and the passing speed of the steel plate 1 is known by the accelerometer 7, and the momentary position of the tip of the steel plate 1 is calculated by the arithmetic unit 8. Tracking is performed, and when it reaches a predetermined position, an operation command is issued to the drive device 5.

As a result, the press dies DI and D2 move in synchronization with the speed of the steel plate cutter, as shown in FIG. , D2 returns to the original position 9 while separating, and on the other hand, the mandrel 2 of the winding machine
At the time of winding, the tip of the steel plate 1 is substantially flat as shown in FIG.

There is no occurrence of ri.

By the way, the movement of press die D 1 +' D 2 is as follows:
It does not have to be elliptical as described above, but may be a circular motion as shown in FIG. 4(a) or a linear motion orthogonal to the steel plate 1 as shown in FIG. 4(b). In addition, the shape of the press die is as follows:
As shown in Fig. 5(a), both have sloped surfaces (D
An object (Db,
), (c) where the leading end side is parallel and the rear end side is inclined (Da), etc. can be selected as appropriate.

Note that the present invention is naturally applicable to other metal plates such as aluminum and steel plates in addition to steel plates.

〔Example〕

5S4 in the range of threading speed 20~2000rn7min
A class 1 copper body was wound at a winding temperature of 100° C. to 100° C., and the occurrence of top marks was investigated. The press die used was of the shape shown in Fig. 2, the angle θ was varied from 3° to 45°, and the rolling load was varied from 500T to 500T.
The experiment was conducted while changing 1.000T.

The results were evaluated based on the dent depth d. FIG. 7 shows a comparison result between a conventional example (without a top mark prevention device) and an example of the present invention regarding the correlation between the dent depth d and the plate thickness t. The results show that the occurrence of top marks can be almost completely prevented.

〔Effect of the invention〕

As described above, the present invention has the advantage that it is possible to prevent the occurrence of top marks regardless of the number of turns and plate thickness, and the cost of equipment is low.

[Brief explanation of drawings]

Figure 1 is a schematic explanatory diagram of a specific example of the present invention, Figure 2 is the operation side opening of the press die, Figure 3 is a diagram of the winding state, and Figure 4 (a).
(b) is another example of press operation, Figures 5 (a) to (c) are front views of press dies with different shapes, Figure 6 is a sectional view showing the indentation that will become the top mark, and Figure 7 is Comparison diagram of dent depth between the conventional example and the example of the present invention, Fig. 8 is a front view of the conventional winding example, Fig. 9 is an enlarged front view of the main part, and Fig. 10 is the conventional top mark prevention method. FIG. 11 is a sectional view of another conventional top mark prevention mandrel. 1. Steel plate (metal plate) 2. Mandrel 3. Wrapper roll 5. Drive device 6. Steel plate detector
7. Accelerometer 8. Arithmetic device P.. Press rolling device 1;) 1. D2...Press die TM...
Topmark Patent Applicant: Sumitomo Metal Industries, Ltd. Figure 1 Figure 4 Figure 2 Figure 3 Figure 5 (') (b) (c) Figure 6
Figure 7 Treatment ㅝ-(mm) Figure 10 Figure 11 Figure 8 Figure 9

Claims (2)

[Claims] (1) A method for winding a metal plate, which is characterized in that, in the upstream stage of a metal plate winder, only the tip of the metal plate is clamped by a press device and thinned toward the tip, and then the metal plate is wound. . (2) A pair of press dies are arranged in the front stage of the metal plate winding machine and are provided oppositely on both surfaces of the metal plate passage, and at least one of the press dies can freely approach and separate from the metal plate. and a tip tracking device located upstream of the press rolling device and detecting the timing when the tip of the metal plate reaches the position of the rolling press device, and the rolling press device has a tip tracking device. A metal plate winding device characterized in that the press dies are moved closer to each other from a separated state upon receiving a metal plate tip reaching signal from the device to press-roll only the tip of the metal plate into a thin tip. .