JPS61226118A - Feeding method for coiler of steel bar - Google Patents

Abstract

PURPOSE:To improve the shape of round bar after winding by guiding steel bar with plural sets of pinching rolls arranged orthogonally. CONSTITUTION:The pinching roll 12 of the front step is taken as vertical roll and the pinching roll 13 of the rear step as horizontal roll and the both is arranged at comparatively short interval. A steel bar 1 is held in the shorter diameter direction of the front step roll 12 thereby and slightly pressed in the shorter diameter direction. The steel bar 1 is in succession guided by the rear step roll 13 via the guide 14 with its torsion and turning being prevented by the front step roll 12. It is shaped so as to become nearly in cylindrical cross section shape at the outlet side of the rear step roll 13.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of feeding a long steel to a winder, and more specifically, the present invention relates to a method of feeding a long steel to a winder, and more specifically, the present invention relates to a method of feeding a long steel to a winder, and more specifically, the present invention relates to a method of feeding a long steel to a winder, and more specifically, the present invention relates to a method of feeding a long steel to a winder, and more specifically, from two directions perpendicular to each other, such as a horizontal direction and a vertical direction. The present invention relates to a method of feeding a steel bar to a winder using a plurality of sets of pinch rolls that pinch the bar.

[Prior Art] FIG. 5 schematically shows an example of a cooling and winding system in a conventional long steel rolling facility. After passing through the final rolling roll 2゜2, the long steel bar 1 rolled by the above-mentioned rolling equipment is cut at its end crop by a flying shear 3, further cooled by a cooling box 4, and then transferred to a pinch roll 5.5 and an inclined arrangement. It is conveyed to, for example, a polling type winder 7 through the driven tube 6, rotated by a spindle 8 connected to a drive means (not shown) of the winder 7, and wound up. There is.

On the other hand, the pinch rolls 5.5 can approach and separate from each other,
In other words, it is composed of a pair of upper and lower horizontal rolls 5.5 that support the bar l so that it can be pinched or released. When the bar 1 is a round bar, as shown in FIG. 6, the curvature of the curved clamping part of the pinch roll 5. is set smaller than the curvature of the long steel ■. The role of the pinch rolls 5, 5 will be explained below.

That is, when guiding (driving) the front end of the strip l into the winder 7, the amount of billets tends to increase more and more recently, and as the height of the winder 7 increases, the billet weight increases.
In order to reliably guide the tip of the winder 7 to the bottom of the winder 7,
As the driving angle θ increases, the resistance to feeding the long steel strip l to the winding machine 7 increases, and as a result, problems such as waist twisting and misrolling occur in the strip. When driving the long steel 1, the long steel 1 is pinched by the pinch rolls 5, 5 and guided while applying feeding force, and the driving angle θ
It becomes necessary to properly control the

Furthermore, when the rear end of the long steel I is being wound up, the long steel I that has left the final finishing rolling machine is wound up only by the rotational force of the winding machine 7, since the feeding force from the rolling mill is no longer available. As a result, the rear end of the strip Ml becomes tightly wound around the inner pin of the winder 7, which not only makes it difficult to take out the coil from the winder @7 after winding is completed, but also Since it may become impossible to wind up and impede the unwinding operation in the next step, when winding up the rear end of the strip 1i1, the pinch roll 5.5 is used to guide the strip jlill while applying an appropriate feeding force.

As mentioned above, the pinch rolls 5, 5 usually pinch the front end or rear end of the long steel bar, but when winding a special shaped steel bar, such as a flat bar or hexagonal steel bar, the pinch rolls 5, 5 pinch the front end or the rear end of the long steel bar, but when winding a special shaped steel bar, such as a flat bar or hexagonal steel bar, they are used to prevent twisting during winding. Pinch the entire length from the need to prevent. The pinch rolls 5, 5 are connected to a controller 1 having a sensor 9.10 on the final rolling roll 2.2 and flying shear 3 side.
The drive is controlled by 1, and the bar l is compressed at a predetermined time.

[Problems to be Solved by the Invention] By the way, in the above-mentioned rolling equipment, the strip El that has passed through the final rolling roll 2.2 is, for example, a round steel.
It is preferable to have a perfect circular cross section, but in reality, despite various rolling methods, there are limits to dimensional accuracy, and the rolled strip 141 has an elliptical cross section that is close to a perfect circle. It becomes.

Moreover, in order to securely hold the bar l by the pinch rolls 5.5 in the above-mentioned winding equipment, the pinch rolls 5.
．． It is necessary to apply a certain amount of clamping force to the bar I from 5 to 5, and as a result, the bar I will inevitably be deformed to some extent by the pinch rolls 5, 5.

In that case, as mentioned above, the curvature of the pinch rolls 5 and 5 is different from the curvature of the strip III, and the contact area between them is small, so the long axis of the long steel I is pinched between the pinch rolls 5. There is a tendency to transfer in a direction that coincides with the axial direction of the rolls 5.5 (left-right direction in Figure 6), and as a result, the bar l is pressurized by the pinch rolls 5.5 in the direction of its minor axis S. .

As described above, when the strip 11 is transferred between the pinch rolls 5.5, an appropriate feeding force to the strip 11 is not maintained, so that the winding state of the strip 1 in the winder 7 is as described above. In order to achieve the inward winding state, an operator constantly monitors and adjusts the pinching force so that the pinch rolls 5, 5 can apply a suitable feeding force to the strip Ill. As a result, the long diameter steel bar l, which originally has an elliptical cross-sectional shape, is pressurized in a direction that further increases its major axis/minor axis ratio, which further deteriorates the shape of the product after winding, and when strict dimensional accuracy is required. In this case, a problem arises in that the part of the product that has been settled by the pinch rolls 5.5 has to be cut off.

Furthermore, the same problem as described above occurs when the bar 1 other than round steel is deformed by the pinch rolls 5.5.

[Means for Solving the Problems] The present invention attempts to solve these problems by providing multiple stages of pinch rolls.

Specifically, the present invention relates to a method for feeding a cooled long steel bar after final finish rolling to a winder, in which at least two pinch rolls arranged close to each other are used to roll the long steel bar at right angles to each other. It is characterized by pinching the steel bar alternately from different directions, restraining and guiding the bar with the front roll, and applying pinching force while applying shaping action to the bar with the rear roll.

In carrying out the method of the present invention, if necessary, the settling action and/or shaping action may be accompanied by a substantial stretching action to reduce the area of the bar by several percent during shaping.

[Operations and Effects of the Invention] In the present invention, the long steel is guided by a plurality of sets of pinch rolls arranged orthogonally. For example, when a round steel is pinched between two stages of pinch rolls, the round steel is guided by the first stage roll. After the round steel is pinched and pressurized in the short diameter direction, the round steel is pinched and pressurized in the long diameter direction by the subsequent rolls, thereby making the shape of the round steel good after winding. can do.

In this case, the front rolls prevent the round steel from being transferred, and the distance between the rolls is short, so twisting of the bar between the rolls is reduced, and the rear rolls can always hold the bar in the longitudinal direction.

In addition, when using three stages of pinch rolls, the round steel shaped by the second stage roll is further pinched by the third stage roll in a direction perpendicular to the second stage roll to perform the final forming. However, it is not preferable to increase the number of stages unnecessarily, and it is preferable to install about three stages.

By increasing the number of stages of the pinch rolls in this way, the reduction ratio at each stage can be made smaller, which enables even higher precision shaping and further improves the dimensions and shape of the product after being wound. I can do it.

In addition, even in the case of bar steel other than round steel, the shape of the product after winding can be made good by pinching the bar steel alternately in mutually perpendicular directions with multi-stage pinch rolls.

[Example] Hereinafter, an example of a round steel winding equipment employing the method of the present invention will be described.

As shown in FIG. 1, the winding equipment according to the first embodiment employing the method of the present invention is basically constructed in the same manner as the conventional example shown in FIG. are given the same reference numerals and the explanation will be omitted.

The equipment of the first embodiment is different from the conventional example in that it is equipped with two sets of pinch rolls, and the front pinch roll 12 is a vertical roll, and the rear pinch rolls 13 are horizontal rolls. Both of them have a relatively short interval (for example, the distance between the mutual roll axes in the bar conveyance direction is 60011 mm)
(approximately IIl).

As shown in FIGS. 2(a) and 2(b), the curvature of the pinched portion of each pinch roll 12, 12 or 13, 13 is set smaller than the curvature of the bar I, as in the conventional example.

Further, the front rolls 12.12 are supported so as to be movable in the left and right directions, and the rear rolls 13. A guide 14 (see FIG. 3) is interposed between the rollers 12 and the subsequent rolls 13, 13 to restrict the movement of the strips 1i1 in the radial direction between them. The front end of the guide I4 forms a stripper part 14a along the clamping part of the front roll 12.12.

In the above equipment, the long steel l is first rolled into the front roll 12.1.
2, it is normally held in the direction of its minor axis S and slightly pressurized in the direction of its minor axis S (FIG. 2(a)). Subsequently, the fiber w41 is guided to the rear roll 13.13 via the guide 14 while being prevented from twisting and shifting by the front roll 12.12, and is pressurized in the longitudinal direction by the rear roll 13.13.
It is shaped to have a substantially perfect circular cross-sectional shape on the exit side of the rear roll 13.13. In the equipment of this first embodiment, the pinch rolls 12, 12, 13, 13 do not substantially reduce the area of the strip R1, but only shape the steel strip I.

Next, a winding equipment according to a second embodiment employing the method of the present invention will be described. In this equipment, the area of the long steel l is reduced and shaped.

As shown in FIGS. 4(b) to 4(d), the equipment of the second embodiment has three stages of pinch rolls 15.
15. +6.16, 17.17, and the front and rear rolls 15, 15, 17°17 are horizontal rolls,
The middle roll 16.16 is a vertical roll. In this case, the strip l1l passed through the final rolling mill 2 and was cooled.
(Fig. 4(a)) is first rolled down into a horizontally long oval cross-sectional shape by the front roll 15.15, and then by the middle roll! It is rolled down into a vertically elongated oval cross-sectional shape by 6°16, and finally it is rolled into strips by the rear rolls 17 and 17! 11 is rolled down so that it has a perfect circular cross-sectional shape. As mentioned above, the area reduction is for long steel! The purpose of this method is to improve the roundness of a long steel strip, and it does not involve a large reduction in area, but rather a shaping bath, or skin pass rolling of a long steel bar into its shape. It should be around a few percent. Note that the pinch rolls may be arranged in two stages. In this case, the caliber shape of the pinch roll is 4th.
The adoption of figures (C) and (d) will be understood from the product shape.

Next, as concrete data, the results of determining the eccentric diameter difference (major axis - minor axis) between the round steel pinched using the first example equipment shown in Figure 1 and the round steel pinched using the conventional example equipment shown in Figure 5. are shown in the table at the end of the specification.

As is clear from the table, for round steel of any size, with conventional pinch rolls, the difference in diameter after pinching is greater than the difference in diameter before pinching, whereas in the present VH (vertical
In the case of horizontal (horizontal) pinch rolls, the difference in diameter after pinching was smaller than the difference in diameter before pinching, confirming the effectiveness of the method of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a drawing schematically showing a long steel winding equipment according to a first embodiment employing the method of the present invention, and FIGS. 2(a) and 2(b) are the front stage of the equipment shown in FIG. Figure 3 is an enlarged horizontal cross-sectional diagram of the pinch roll section of the equipment shown in Figure 1; Figures 4(a) to 4(d) are FIG. 5 is a cross-sectional explanatory diagram that continuously shows the pinching procedure in the long steel winding equipment according to the second embodiment employing the invention method; FIG. 5 is a diagram schematically showing an example of the conventional winding equipment; 5 is an enlarged cross-sectional explanatory view of the pinch roll in the equipment of FIG. 5. FIG. I... Bar, 7... Winder, 12.13...
・Pinch roll. Patent applicant Kobe Steel Co., Ltd.
The influence of pinch rolls on the difference in diameter Normal reduction method: Normal reduction amount of round steel by pinch rolls s6 Figure 2 Figure 35! ! 4th WJ

Claims (2)

[Claims] (1) A method of feeding the cooled long steel bar after final finishing rolling to a winder, in which the long steel bar is fed alternately from two directions orthogonal to each other by at least two pinch rolls placed close to each other. sandwiched between
A method for feeding long steel to a winder, characterized in that a front roll restrains and guides the long steel, and a rear roll applies a pinching force while applying shaping action to the long steel. (2) A method for feeding a long steel to a winder according to claim (1), wherein the clamping action and/or shaping action is accompanied by a reduction in area of several percent.