JPS6099515A - Shear cut mark preventive device on shear line - Google Patents

Abstract

PURPOSE:To restrict change of the tensile force of a strip and eliminate surface defects such as a roll mark or the like by providing a tensile force damper roll on a shear line. CONSTITUTION:A vertically movable roll 5 of spring type or the like is provided on the rear step of a strip S and a roll with comparatively large quantity of deflection, for example, a lever roll 4. By having the vertically movable roll 5 serve as a sort of tensile force damper, change of the tensile force at the time of shearing is automatically absorbed. The mechanism of the captioned device is not limited to the spring type and a damper generally used, for example, of oil pressure type, rubber type or the like may be adopted. Roll marks and the like can thus be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing the appearance of cut marks in a cutter.

In conventional metal strips (hereinafter referred to as "stripe IJ"), as shown in the layout diagram in Fig.
2. Major 117 ri" 0-J 31 level roll 4 etc. 1i" Distribution ff
When the strip S is cut by the shear 1, 1. The strip S is pulled in the line direction by a slight force by the shearing device, causing the line tension to fluctuate. For this reason, the strip S is e.g.
When this strip is supported by a large deflection angle l710-le, the fluctuation condition t and therefore E) IJ
Surface defects such as roll marks occur on the knob S.・For this reason, conventionally, controlling the rotating parts such as the pinch roll 2 by suppressing the rotational force (force;, soσ) was extremely complicated and extremely difficult.

The present invention has been made to address these conventional problems, and is intended to prevent surface defects such as roll marks and other defects on the IJ knob due to tension fluctuations during cutting, even if the cutting line is cut. It is.

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

FIG. 2 shows an example of the improved shear line arrangement according to the present invention, in which 1 is a shear, 2 is a pinch roll, 3 is a measure roll, and 4 is a leveler roll. In the present invention, the strip S and the deflector amount are A vertically movable roll 5 of a spring type or the like that can move vertically is disposed downstream of a fairly large roll, for example, a leveler roll 4.

This vertically movable roll 5f serves as a kind of tension bar to automatically absorb tension fluctuations during shear cutting. The mechanism is not limited to a spring type, but may be a fluid damper such as a hydraulic damper, or a generally used rubber type.

In this way, a vertically movable roll (
By arranging the tension damper row/L/), strip tension fluctuations are suppressed, surface defects such as roll marks are eliminated, and extremely stable jar links are made possible, thereby achieving the intended purpose of the invention. be able to·.

[Brief explanation of the drawing]

FIG. 1 shows a conventional shear line layout, and FIG. 2 shows an embodiment of the improved shear line layout of the present invention. ■... Sheet 2... Vintage roll 4... Leveler roll 5... Vertically movable roll (damper roll) S... Strip applicant Sumitomo Heavy Industries, Ltd. sub-agent Patent attorney Yuki Ohashi Figure 1 Figure 2

Claims (1)

[Claims] In a shearing line that straightens the flatness of a strip and cuts it, for example, a leveler roll, a roll with a considerably large amount of deflection is used at the rear of the roll, and a straight IJ and a 7-beam upper and lower IJ that absorb tension claws are placed at the end of the roll. Shakat °? - Anti-friction device.