JPS5823801B2 - Metal material rolling equipment row - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling mill train for circular cross-section metallic materials, including a planetary inclined roll mill.

The planetary inclined roll rolling mill is a well-known rolling mill that has attracted much attention and is mainly used for the production of hot steel round bars or for rough rolling on billet, rod and wire production lines, etc., and is capable of achieving high elongation in one pass.

One of the features of this rolling mill is that the rolls revolve around the material while rotating, so the material to be rolled does not rotate during rolling.For this reason, planetary inclined roll mills are placed before and after this rolling mill. It is possible to perform continuous rolling in combination with rolling equipment.

Conventionally, the surface of the rolled material rolled by this planetary type inclined roll rolling mill has a spiral surface unevenness, and the rolled material coming out of the planetary type inclined roll rolling machine is directly rolled into a round bar. Not only when selling the product, but also when sending it to the next process such as a rolling mill, there is a risk of significantly damaging the appearance of the product, or causing surface flaws such as creases and wrinkles in the next process. In order to develop, etc.
This has damaged the reputation of the planetary inclined roll mill and has become an extremely serious obstacle to its widespread use.

As a solution to this problem, a method is known in which a die or the like with a complicated lubricant spraying device is placed on the exit side of a planetary inclined roll rolling mill. It must be said that this method is extremely disadvantageous in terms of workability, equipment maintenance, and other costs, and is extremely unsatisfactory as a solution.

The present inventors conducted various studies to solve this problem, and as a result, they discovered an excellent method that uses an extremely simple device and can produce great effects.

In other words, in conventional non-planetary inclined rolling methods, such as small-scale inclined rolling mills where the material to be rolled rotates round and round, the tip of the material to be rolled is shaken to prevent it from losing its straightness. It is known to use a method of gripping the product with a chuck and rolling it while pulling it, but this method is not only disadvantageous in terms of equipment, but it is clear that it cannot be used for continuous rolling in large-scale mills. be.

The invention provided herein by the present inventors is extremely applicable to large-scale continuous rolling for mass production or endless rolling (hereinafter referred to as a method of continuously rolling a rolled material without breaks for an extremely long time). This is an excellent method.

That is, the inclined roll 12 shown in FIG.
A rolling mill or a roller-type tensile force button device, such as a pinch roll, is placed close to the exit side of a planetary type inclined roll rolling machine that rotates and revolves around the axis of 1. This is an extremely simple rolling method in which the material to be rolled is rolled while applying a tensile stress within the yield stress of the material to be rolled, which is placed between a rolling mill or a roller-type tensile force button device placed immediately on the exit side.

By this method, it is possible to completely eliminate the spiral irregularities that appear on the surface of the material to be rolled when it is rolled with a planetary inclined roll mill.

In addition, since the roller type tensile force applying button device is placed close to the exit side of the planetary type inclined roll rolling machine, the planetary type inclined roll rolling machine and roller type tensile force applying device generated at the leading and trailing ends of the rolled material can be This is extremely advantageous because it is possible to minimize the unsteady portion of the material to be rolled, which corresponds to the distance between the rolling parts, even when endless rolling is not performed.

The principle of applying tension to the material to be rolled between the planetary inclined roll rolling mill and the rolling mill or roller-type tensile force applying device placed close to the exit side is to appropriately control the motor rotation speed of each rolling mill. This can be done by any known method.

For example, FIG. 1 shows the relationship between a planetary type inclined roll rolling mill 1 and a roller type tensile force button device. 2 is arranged so that an appropriate tensile stress within the yield stress of the rolled material 11 is applied to the rolled material 11.

12 indicates an inclined roll.

In this case, the roller-type tensile force applying button device 2 is adjusted and driven by a drive unit (not shown), and an appropriate tensile stress is applied to the rolled material 11.

The figure shows a combination of two sets of rolls whose roll axes are horizontal and vertical, respectively, and by this method, the surface condition of the rolled material discharged from the planetary inclined roll mill is of extremely high quality. Not only that, but also the dimensional accuracy can be significantly improved.

Of course, it is also possible to use one set of rolls in the roller type tensile force button device, and it is also possible to combine three or more sets of rolls.

In addition, in the case of two or more sets, the roll axes are not limited to horizontal or vertical, but may be used in combination with rolls whose roll axes are horizontal to horizontal, vertical to vertical, or whose roll axes are tilted at ±45°.

However, the method shown in the embodiment of FIG. 1 is extremely advantageous when equipment costs, operational aspects, quality improvement effects, etc. are all considered.

In addition, the reference photo shows the surface condition when tension was applied and when no tension was applied on the exit side of a planetary inclined roll rolling mill in an experiment using plasticine. , it is shown that the surface of the rolled material is significantly improved.

Note that σf in the reference photo is the added tensile stress (kg/mA
) indicates the yield stress (kg/mt) of the rolled material.

2A, 2A and 2B show a rolling mill row including a planetary inclined roll rolling mill 1 and a roller tensioning button device 2, and the heating furnace and other attached equipment are not shown.

A is an example of a layout when manufacturing round bars or billets, and by making the roll hole shape of the roller-type tensile force button device 2 round 21 or square 22, respectively, the product quality can be maintained at a good level. A desired good cross-sectional shape of the product can be obtained.

4 is a shearing machine. A is an example of a layout for manufacturing rods and wire rods, in which the rolling mills exiting the planetary inclined rolling mill 1 and the roller tensioning button device 2 enter a conventional continuous rolling mill row 3.

In this case, whether 3 is horizontal, vertical, or a combination thereof is completely arbitrary.

Further, attached rolling equipment is not shown.

One example shows the case where the tensile force is applied to the material to be rolled at the first stand 31 of a conventional continuous rolling mill.

In addition, the hole shape series (A) and (3) can be used by appropriately combining oval, round, square, etc.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the relationship between a planetary type inclined roll rolling mill and a roller type tensile force button device; 1 is a block diagram showing each embodiment of a rolling mill train of the present invention; FIG. 1... Planet type inclined roll rolling mill, 2...
・Roller type tension applying device, 3... Conventional rolling machine, 4... Bent shearing machine, 11... Material to be rolled, 12
. . . Inclined roll, 21 . . . Roll with round holes, 22 . . . Roll with square holes.

Claims (1)

[Claims] 1. In a metal material rolling equipment row including a planetary type inclined roll rolling machine in which the rolls 12 rotate and revolve around the axis of the rolled material, a roller type tension applying device is provided at a close distance on the exit side of the planetary type inclined roll rolling machine. A row of rolling equipment for metal materials.