JPS58110102A - Rolling mill - Google Patents

Abstract

PURPOSE:To provide a rolling mill which has a high rolling and scale breaking effect under strong rolling reduction and is simple in device constitution by consisting the same of a bender consisting of plural rolls and a rolling device having work rolls disposed on the outlet side thereof. CONSTITUTION:A titled rolling mill is a rolling mill consisting of a bender 1 consisting of at least 3 rolls which are in mutually deviated position relations and a rolling device 2 which is disposed on the outlet side thereof and has at least a pair of work rolls 21, 21, by which plastic bending and stretch rolling are accomplished and a strong rolling reduction and a scale breaking effect is obtained. The device 1 cracks the scale of a material by acting bending upon the material and backup rolls are provided to the constituting rolls to improve the effect of breaking the scale. Auxiliary rolls are provided in addition to backup rolls 22 to the work rolls 21 of the device 2, or the rolls 21 are arranged in mutually deviated position relations to improve the efficient of strong rolling reduction.

Description

[Detailed description of the invention] The present invention relates to a rolling mill.

Conventionally, there are planetary S-type rolling mills, six-layer rolling mills, wrapping Pv mills, etc., which have been used as strong reduction rolling mills. Planetary mills have drawbacks such as a complicated structure, difficult roll maintenance, low rolling speed, and the tendency for edge cracks to form in the rolled material. The six-layer rolling mill has drawbacks such as high equipment costs and the rolling rolls being easily damaged.

The winding P-mill has drawbacks such as complicated and expensive equipment for changing rolls, etc.

Further, conventionally used scale breakers include bending rolls and light reduction rolling mills. Bending roll has little scale breaking effect. Light reduction rolling mills have severe roll wear and little scale braking effect.

Therefore, an object of the present invention is to eliminate the drawbacks of conventional hard reduction rolling mills and scale breakers, and to obtain a rolling mill with high hard reduction rolling and scale Q-breaking effects.

The rolling mill of the present invention achieves strong reduction and scale breaking effects by performing plastic facing and tension rolling.

The rolling mill of the present invention is made up of a bending device 1 and a rolling device 2, as shown in FIG.

The bending device 1 has the same structure as a normal scale breaker, and is provided on the inlet side of the rolling device 20. The bending device 1 bends the material to create cracks in the scale generated on the surface of the material.

The bending device 1 may be configured to include a backup roll 12 for the central roll 11 as shown in FIG. 3, or a plurality of rolls as shown in FIG.

As shown in FIG. 1, the basic configuration of the rolling apparatus 20 includes a pair of work rolls 21 and a pair of backup rolls 22.
It is made up of. These rolls are provided with at least one stand and placed on the exit side of the bending device 1. In this rolling device 2, the centers of the work roll 21 and the knock-up roll 22 are aligned in a straight line, and this straight line perpendicular to the pass line.

In the embodiment shown in FIG. 1, a bending device 1 and a rolling device 2 are arranged separately and in sequence, and exhibit a great effect as a scale breaker.

Conventional scale breakers were provided with only a bending device or only a rolling device, but the rolling mill of the present invention combines both and sequentially arranges them, simplifying the overall arrangement.

2 to 4 show another embodiment of the rolling mill of the present invention. In these embodiments, the work rolls 21 of the rolling mill 2 are offset relative to each other so that each work roll 21
The work roll 21 is supported by a pick-up roll 22, and an auxiliary roll 23 is provided to prevent the work roll 21 from shifting. The misalignment position of each work roll is determined by the upper work roll 21 as shown in FIG.
may be located downstream of the lower workpiece 90-rule 21 with respect to the material pass line, or vice versa, as shown in FIG.

The rolling device 2 strongly reduces the material by applying both bending and tension to the material. By varying the circumferential speeds of the upper and lower work rolls, a scale braking effect is also produced.

In the embodiment shown in FIG.
A backup roll 12 is provided.

To increase the scale breaking effect on Sarah,
As shown in FIG. 4, the bending device 1 can also be of the repeller type.

When comparing the relationship between load and rolling reduction rate with the conventional method and determining it through experiments, it was found that the rolling mill of the present invention can achieve a larger rolling reduction rate than the conventional rolling mill even when the load is small. Ta.

Furthermore, when the shape of the rolled product was inspected, edge drops were reduced compared to conventional rolling mills. The reason for this is that, as mentioned above, the load is small and the roll is less prone to deflection.

[Brief explanation of the drawing]

FIG. 1 to FIG. 4 schematically show the configuration of a rolling mill of the present invention. 1: Bending device 11: Knock-up roll 2: Rolling device 21: Work roll 22: Backup roll 23: Auxiliary roll (2 people outside) Fig. 6 Fig. 4

Claims (4)

[Claims] (1) At least three o's in mutually shifted positions
A rolling mill consisting of a bending device consisting of -7y and a rolling device arranged on the exit side of the bending device and having at least one pair of work rolls. (2) A bending device consisting of at least three rolls that are offset from each other, and at least three rolls (both of which are a pair of workpieces and A rolling mill comprising: a rolling device having a q-ru; (3) The rolling mill according to claim (1) or (2), characterized in that at least one of the rolls of the bending device is supported by a backup roll. (4) The rolling mill according to claim (2), wherein the work rolls of the rolling apparatus are supported by auxiliary rolls.