JPH0761501B2 - Winding method for steel strip - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of winding a steel strip, which prevents the generation of end marks of a coil by using a stepped sleeve when winding a steel strip on a mandrel.

2. Description of the Related Art When a steel strip is wound around a coil, the transfer of end marks that occurs in several to several dozen turns of the inner diameter of the coil reduces the yield due to surface defects.

Therefore, when winding the steel strip around the coil, it is important to prevent the end mark from occurring.

Conventionally, as a measure for reducing / preventing end marks, a method using a rubber stepped sleeve having a stepped portion on the outer circumference has been generally used.

This stepped sleeve is used by fitting it to a mandrel with a built-in expansion / contraction mechanism.When winding a steel strip around the mandrel,
The tip of the steel strip is brought into contact with the stepped portion of the sleeve to start winding. For that purpose, it is necessary to adjust the position so that the step portion is always at a predetermined position.

As a means for this, conventionally, as shown in FIG. 3, a key groove (2) is provided on a stepped sleeve (1), and a key (4) is provided on the segment (3) side of the expansion / contraction structure that constitutes a mandrel.
There is a method of positioning by fitting the key into the key groove (2) on the sleeve side.

However, in this method, as shown in FIG. 2B, a stress is generated in the circumferential direction of the rubber sleeve due to the enlargement of the segment (3), and the stress in the circumferential direction is the thin portion of the key groove (2). There is a problem that the end portion becomes thinner when the steel strip is wound, because the portion is further locally thinned due to the concentration of the steel strip.

In order to solve this problem, there is a two-step expansion / contraction method using a stepped sleeve without a key groove. According to this method, as shown in FIG. 4, the step position of the stepped sleeve (5) without a key groove is matched with the registration register of the segment (6) without a key, and the shift is prevented by the two-stage expansion / contraction mechanism of the segment. Is the way.

In other words, this method incorporates a mode in which the reduction of the mandrel at the time of removing the coil of the completed winding is stopped halfway, and the state where the sleeve is expanded by the segment is maintained,
When the rubber sleeve is pulled out, the reduction of the mandrel is minimized so that a clearance is generated between the sleeve (5) and the segment (6).

According to this method, although there is no problem of local deformation as in the sleeve system with the key groove, since the stepped sleeve (5) and the segment (6) are simply fixed by frictional force, it is possible to wind them. The tension inevitably causes displacement. Each time this deviation occurs, the alignment of the sleeve and the segment must be repeated, which causes a problem that the work is complicated and requires a lot of labor.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention has a problem of end mark generation due to local deformation in a key-key groove fitting method used as a step portion position aligning means of a stepped sleeve, and a step by a two-step expansion / contraction method. An object of the present invention is to solve the problem of the deviation of the attached sleeve and propose a winding method for a steel strip which can always set the stepped portion to a predetermined position for winding.

Means for Solving the Problems The present invention requires a stepped sleeve without a key groove and detects the circumferential position of the stepped sleeve during winding while preventing the end mark of the steel strip, and based on this detection result By this method, the stepped portion can be positioned and winding can always be started at a predetermined position.

That is, the gist of the present invention is to provide a circumferential position detecting portion at the end of a stepped sleeve without a key groove, and this detecting portion is automatically detected by an automatic detecting device such as an electric device, and this detecting position is used as a reference. After rotating the mandrel (segment) to set the step portion at a predetermined position, the tip of the steel strip is brought into contact with the step portion and wound.

Work The circumferential position detector, which serves as a reference point for positioning the step, is provided at the end of the stepped sleeve.

This position detector is provided according to the detection method,
For example, when a laser rangefinder is used as the position detector, a notch such as a recess or a protrusion is formed at the end of the stepped sleeve.

When using a proximity switch to detect the position, a metal shoulder is attached to the end surface of the stepped sleeve.

When the position detector detects the detector provided on the stepped sleeve, the mandrel is rotationally controlled from that position to bring the step to a predetermined position.

To control the amount of rotation to bring the step to a predetermined position,
This can be easily controlled by calculating the rotation amount from the detection position to a predetermined position, converting the rotation amount into a pulse, and counting the number of pulses.

When the step portion is brought to a predetermined position, the leading end of the steel strip is brought into contact with the step portion to start winding.

Embodiment FIG. 1 is a schematic view showing a position detecting method of a stepped sleeve according to the present invention, FIGS. (A) and (B) being a method for detecting a position using a laser range finder, and FIG. (C) being a proximity switch. It is a figure which shows the method of performing a position detection using.

That is, when using a laser range finder, a concave section (12) or a convex section (13) is formed at the end of the stepped sleeve (11), and the laser range finder (14) is used to form the concave section (12) or convex section. The part (13) is detected.

When a proximity switch is used, a metal piece (15) is attached to the end of the stepped sleeve (11) and the proximity switch (16) detects it, as shown in FIG.

FIG. 2 is a diagram showing a device configuration example for carrying out the method of the present invention. When the step portion (11-1) of the stepped sleeve (11) is set at a predetermined position, the rotation control device (17) The mandrel is rotated at low speed by the laser rangefinder (14) to detect the convex part (13) provided at the end of the stepped sleeve, and the arithmetic unit (18) detects the distance from the detected position to the predetermined step position. The number of pulses is calculated, and the number of pulses is calculated by the rotation control device (1
7), the mandrel is rotated by the rotation control device, the number of pulses is counted by the pulse generator (19), and the rotation of the mandrel is stopped when the pulse count number matches a predetermined pulse number. Complete the positioning of the stepped sleeve.

When the stepped portion of the stepped sleeve is set at a predetermined position in this manner, the leading end of the steel strip is brought into contact with the stepped portion to start winding.

EFFECTS OF THE INVENTION As described above, since the present invention is a method for determining the position of the stepped portion with reference to the stepped sleeve side, not only can the winding start position of the steel strip be accurately controlled, It is possible to wind up while preventing the end mark of the steel strip and maximize the effect of the stepped sleeve.

Further, even in the case of adopting the two-stage expansion / contraction method for the segment, the misalignment between the segment and the stepped sleeve is not necessary, and the loss of the steel strip winding time is reduced, resulting in an improvement in work efficiency.

[Brief description of drawings]

FIG. 1 is a schematic view illustrating a position detecting method for a stepped sleeve according to the present invention. FIGS. 1A and 1B show a position detecting method using a laser rangefinder, and FIG. 1C shows a proximity switch. The method of detecting the position by using each is shown below. FIG. 2 is a schematic view showing an example of the apparatus configuration for carrying out the method of the present invention. FIG. 3 is a longitudinal sectional view showing an example of fitting a conventional stepped sleeve, (A) showing a state before segment expansion, (B).
FIG. 6 is a diagram showing a state after segment expansion. FIG. 4 is a longitudinal sectional view showing an example of fitting a conventional stepped sleeve. 11 …… Step sleeve, 12 …… Concave section 13 …… Convex section, 14 …… Laser distance meter 15 …… Metal piece, 16 …… Proximity switch 17 …… Rotation control device, 18 …… Computing device 19 …… Pulse generator

Claims (1)

[Claims] 1. A method for winding a steel strip by covering a mandrel with a stepped sleeve without a key groove, the stepped sleeve having a stepped portion on the outer periphery thereof, wherein a circumferential position detecting section provided at an end of the stepped sleeve is electrically connected. It is detected by an automatic detection device such as a device, the mandrel is rotated based on the detected position to set the step portion at a predetermined position, and then the tip of the steel strip is brought into contact with the step portion for winding. Characteristic steel strip winding method.