JPH01210102A - Method for rolling of steel bar stock without holding guide - Google Patents

Abstract

PURPOSE:To perform finish rolling of a steel bar stock having an optional dimension by supplying the stock to a shaping rolling mill group forming the stock into a specific shape and performing only a simple operation of draft adjustment of rolling mills. CONSTITUTION:A shaping rolling mill group 21 is installed for a rough or intermediate rolling line 11 obtaining a steel bar stock. The group 21 consists of 3 passes rolling mills 31, 32, 33 provided with respective two rolls. An inlet side guide of the mills 31, 32, 33 merely has a guiding function and has no protective function preventing the stock from twist rolling. The two rolls mills 31, 32, 33 provided with a draft adjusting function are made to obtain the total percentage reduction of <=15% in 3 passes by the function. The rotating axis of the rolls in respective passes is alternately deviated by 90 deg. from each other and a rotating axis distance between adjacent respective passes is set to be not more than 30 times a dimension of the stock.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for rolling a long steel (bar or wire) without a holding guide.

Generally, the hot rolled steel bar material is further processed into final products that are used for various purposes. In this processing step, in order to reduce the processing work, etc., it is necessary to make sure that the raw material to be processed is finish-rolled (precision rolled) to the final product in advance. Needless to say.

Therefore, at the stage of rolling steel bars, the rough rolled or intermediate rolled steel bars are further subjected to a series of finish rolling. It is required to freely adjust the finish rolling dimensions of a single-strip steel material, and moreover, it is required to perform this smoothly.

The present invention relates to a method of rolling a long steel bar without a holding guide in response to such demands.

<Conventional technology and its problems> Traditionally, this is a method for finishing rolling steel bars.

Three or four rolling mills are arranged vertically and horizontally,
A method of adjusting the rolling reduction to regulate the area reduction rate in each upstream rolling mill (JP-A-57-165101, JP-A-5
No. 9-229204), and at least three rolling mills are arranged so that the rotating axes of their rolling rolls are alternately offset by 90 degrees, and the total area reduction rate in each rolling mill is 15% or less and the final The area reduction rate in the two rolling mills is 3% each.
The following method of regulation (Japanese Unexamined Patent Publication No. 60-152302),
Furthermore, there is a method in which a large number of roll stands each having at least three driving rolls are arranged, and a guide mechanism for preventing twisting of the long steel material is not provided between these roll stands (Japanese Patent Application Laid-Open No. 54
-50459) etc. have been proposed.

However, these conventional methods have some drawbacks due to their structure.

There are problems in that the adjustment work of the rolling rolls for finish rolling the long steel material into the various dimensions required is troublesome, and the configuration of the rolling mill group itself is quite complicated.

<Problems to be Solved by the Invention and Means for Solving the Problems> The present invention solves the conventional problems as described above and provides an improved method for rolling long steel without holding guides, which meets the above-mentioned demands. It is something to do.

Therefore, in the present invention, when finish rolling a hot-rolled long steel material, the long steel material is supplied to a shaping rolling mill group formed by the following 1) and 2), so that the dimensions of the long steel material can be adjusted freely. The present invention relates to a method for rolling a long steel without a holding guide, which is characterized by finishing.

1) Consisting of two or three-pass two-roll rolling mills each equipped with a reduction adjustment mechanism, the inlet guide of each two-roll rolling mill does not have a holding function to prevent twisting of the long steel material, and does not guide the long steel material. Only features and 15% in total for each pass
A group of shaping rolling mills having the following area reduction ratio, 2) The rotation axes of the rolls in each pass are alternately deviated by 90 degrees, and the rotation axes of the rolls between U adjacent passes. Forming and rolling mill group in which the core distance is set to 30 times or less the length of the long steel material The important point in the present invention is that for the rough rolling to intermediate rolling series for obtaining the long steel material, an inlet guide is provided to prevent twisting of the long steel material. A predetermined two-roll rolling mill having only a guiding function without a holding function is arranged in series for two or three passes,
With just the simple task of adjusting the pressure of the two-roll rolling mill,
This is a place where steel bar materials are freely finished rolled to desired dimensions.

Hereinafter, the configuration of the present invention will be explained in more detail based on the drawings.

<Embodiments and their effects> FIG. 1 is a system diagram showing one implementation procedure of the present invention.
A shaping press L@ machine group (finishing rolling series) 21 is arranged. The long steel material obtained from the rough rolling to intermediate rolling series 11 is supplied to the forming rolling machine group 21 whose rolling reduction has been adjusted in advance according to the finished dimensions required for the #4 material,
It is then subjected to finish rolling to the dimensions of 9.

The shaping rolling mill group 21 includes a 3-pass two-roll rolling mill 31,
32, 33 calanaris, each 20-mill rolling a31.32.
The entrance side guide 33 (not shown) has a holding function to prevent the long steel material from twisting and only has the function of guiding the long steel material, and the two roll rolling mills 31, 32, and 33 have a rolling reduction adjustment mechanism (not shown). The rolling rolls 41, 42, 43 are formed so as to have a reduction in area of 15% or less in the total of the three passes indicated by L, and the rolling rolls 41, 42, 43 in each pass are
The rotation axes of the rolling rolls 41, 42, and 43 between adjacent passes are alternately shifted by 90 degrees, and the rotation center distance # (L+, L1 in Fig. 2) of the long steel material is 1°. If the total area reduction rate, which is set to be 30 times or less than the diameter, exceeds 15%, it will be difficult to obtain the specified dimensional accuracy.
In addition, if the rotation axis distance exceeds 30 times the length of the bar surface material,
Twisting occurs in the bar, making it difficult to roll it without a holding guide as in the present invention.

FIG. 2 is an enlarged perspective view showing the arrangement of rolling rolls in each pass in the shaping rolling mill group of FIG. 1. FIG.

The rolling rolls 41 of the first two-roll rolling mill 31 in the shaping rolling mill group 21 in FIG. 1 are vertical rolls, and the next two-roll rolling mill 32 adjacent to the two-roll rolling mill 31
The rolling rolls 42 are horizontal rolls, and the rolling rolls 43 of the last two-roll rolling mill 33 adjacent to the two-roll rolling mill 32 are again vertical rolls. The rotational axes of the rolling rolls 41, 42, and 43 in each pass are alternately offset by 90 degrees, and the rotational axis distance L1 between the rolling roll 41 and the rolling roll 42 and the rolling axis distance L1 between the rolling roll 42 and the rolling roll 43 are alternately shifted by 90 degrees. The rotation axis distance L2 between the two is set to be 30 times or less the dimension of the bar steel material, respectively, and the area reduction rate is 15% or less in total for the three passes. In this case, as an additional condition, in order to obtain good dimensional accuracy, it is preferable to form each of the final two passes so that the area reduction rate is 3% or less, and each rolling roll 4
It is preferable to select a hole shape of 1°42.43 degrees from a relatively narrow opening angle of 90 to 140 degrees to provide a margin for adjustment of the roll gap of the rolling rolls 41, 42.43.

As mentioned above, each 20-rule rolling fi31,32.33
The entrance side guide has only the function of guiding the bar material and is therefore loose, so the bar material can be finished rolled to any size by adjusting the rolling reduction of each 20-roll rolling a31, 32, and 33. To avoid the inconvenience caused by twisting of the long steel material that may occur in this case, the rotation axis side fa (L+, L, □) of the rolling rolls 41, 42, 43 between adjacent passes should be made as short as possible as described above. By doing so, we are preventing it from happening.

In the present invention, the shaping rolling mill group is formed in 2 or 3 passes, and furthermore, the rotation axes of the rolling rolls in each pass are alternately set at 9
The reason why each rolling mill is deviated by 0 degrees and the distance between the rotation axes of the rolling rolls is set to 30 times or less than that of the long steel material, and the area reduction rate in the shaping rolling mill group is regulated to 15% or less. This is extremely important from a practical point of view and test results in relation to the inseparable relationship between making the inlet guide of the machine loose and obtaining flexible finish dimensions only by adjusting the reduction, and within the scope of such regulations. In practical terms, it is possible to finish the rolled steel material to, for example, 50φ±O, 15 mm or so, without any difficulty.

<Effects of the Invention> As explained above, the present invention has the effect that it is possible to easily finish roll a bar steel material to any size.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing one implementation procedure of the present invention, and FIG. 2 is an enlarged perspective view showing the arrangement of rolling rolls in each pass in the shaping rolling mill group of FIG. 1. 11... Rough rolling to intermediate rolling series 21φ, shaping rolling mill group 31.32, 33φ, 2-roll rolling mill 41.42, 43... Rolling roll patent applicant Daido Steel Co., Ltd. agent Attorney on patent attorney Hiromasa Iriyama Figure 1 Figure 2

Claims (1)

[Claims] 1. When finish rolling a hot-rolled long steel material, the long steel material is supplied to a shaping rolling mill group formed by the following 1) and 2), and the dimensions of the long steel material are adjusted. A method for rolling steel bars without holding guides, which is characterized by the ability to finish freely. 1) Consisting of two or three-pass two-roll rolling mills each equipped with a reduction adjustment mechanism, the inlet guide of each two-roll rolling mill does not have a holding function to prevent twisting of the long steel material, and does not guide the long steel material. Only features and 15% in total for each pass
A shaping rolling mill group having the following area reduction ratio: 2) The rotation axes of the rolls in each pass are alternately offset by 90 degrees, and the rotation axes of the rolls between adjacent passes. A group of forming rolling mills whose distance is set to 30 times or less the length of the long steel material.