JPH04322804A - Three-roll rolling mill which is incorporable into two-roll rolling mill - Google Patents

Abstract

PURPOSE:To offer a three-roll rolling mill which is incorporable into a two-roll rolling mill in a rolling mill with which a billet which consists of steel or nonferrous metal is rolled into a bar, wire rod, tubing and other long sized materials with circular or annular cross section. CONSTITUTION:This rolling mill is constituted by arranging the roll arrangement so as to shift the phase by 60 deg. with respect to the axis of rolling of material to be rolled, connecting a gear train and universal joints 18a, 18b to each of two three-roll rolling mills, making two the above-mentioned universal joints connectable to two roll driving shafts 11, 11a for driving a two-roll rolling mill and arranging a one-way clutch 37 into the gear train on the other side. The two-roll rolling mill and three-roll rolling mill become freely exchangeable, the rolling mill can be freely switched depending on the purpose and the freedom of operation is drastically improved.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a rolling mill for rolling billets made of steel or nonferrous metals into bars, wires, tubes, and other elongated materials with a circular or annular cross section (hereinafter referred to as bars). The present invention relates to a three-roll rolling mill that can be incorporated into a two-roll rolling mill.

0002

BACKGROUND OF THE INVENTION Recently, the needs of steel bar and wire rod users have become increasingly demanding, as shown below. ■Requirements for precision rolled materials (omission of secondary processing steps) ■Requirements for free size rolling (omission of secondary processing steps and shortening of delivery process to users)

[0003] As one means of achieving these requirements, three-roll rolling mills are increasingly being introduced.

[0004] The aim is to first improve the high dimensional characteristics of the 3-roll rolling mill, such as small width variation, for the above item (2), and to improve rearrangement at the time of size change by forming the 3-roll rolling mill into blocks for (2). This saves time.

Regarding (2), as disclosed in Japanese Unexamined Patent Application Publication No. 63-43702 previously filed by the inventor of the present application, there is a characteristic that the occurrence of deviation in diameter due to rolling reduction adjustment of a three-roll rolling mill is small. It is also possible to create one-size-fits-all products by focusing on the special rolling pass flow and lower left adjustment.

[0006] In order to realize these, at least two three-roll rolling mills each having three rolls arranged every 120 degrees are required.

FIG. 7 shows the roll arrangement of two three-roll rolling mills, with FIG. 7(A) being a plan view and FIG. 7(B) being a front view.

(B) As shown in the figure, the phases of the three roll assemblies of the two three-roll rolling mills are shifted by 60 degrees, and this is because the rolls 8, 9, and Free surface 3 that is not the rolled surface of the bar rolled in step 10
7 to the second same 120 degree rolls 8a, 9a, 10a
This proves that rolling of the entire circumference is completed only by rolling at .

[0009] This is the reason why at least two rolling mills are required. In order to further reduce the area of the bar, the number of combinations of two rolling mills may be increased.

0010

[Problem to be Solved by the Invention] Conventionally, it has been considered common sense that a three-roll rolling mill has a drive system separate from that of a two-roll rolling mill, and is placed on the rear side of the two-roll rolling mill. Ta. For this reason, when a three-roll rolling mill is introduced, the total length of the line becomes longer and the installation space becomes larger. ■ It is necessary to have a separate drive system, which increases capital investment. ■ 3 rolls on a line with only 2 roll rolling mills
Introducing a roll rolling mill has required large-scale equipment modifications and long periods of suspension. (2) For medium and thick round sizes, the distance between the finishing 3-roll mill and the 2-roll mill one upstream is long, and the temperature drop between them is large, causing quality problems. ■ Japanese Patent Publication No. 63-437
When performing free sizing as shown in Publication No. 02, if the distance between the two rolling mills becomes large, twisting of the bar material will occur, which will greatly affect dimensional accuracy. There were potential equipment and quality problems.

[0011] As equipment for two 3-roll rolling mills that solved these problems, the inventors of the present application have already utilized the drive system and stand rearrangement device of the 2-roll rolling mills as they are, so that the space of the 2-roll rolling mills can be saved. Invented a three-roll rolling mill that could be built into the machine and filed an application earlier (Japanese Patent Application No. 2-3328).
No. 84).

The structure is as shown in FIG. 8, in which two 3-roll rolling mills are individually connected to the two roll drive shafts of one 2-roll mill through a universal joint and a gear train. , is a three-roll rolling mill that can be incorporated into a two-roll mill, characterized in that the roll arrangements of the two three-roll mills are arranged with a phase shift of 60 degrees with respect to the rolling axis of the material to be rolled.

FIG. 8(A) shows the drive gear train of two 3-roll rolling mills from the universal joints 18a, 19a of the 2-roll drive shaft, and FIG. 8(B) shows the arrangement of the gear train of the 3-roll rolling mill. It is a diagram.

In this case, the first and second 3-roll rolling mills each have two universal joints 1 with the same rotation speed.
8a and 19a, it is not possible to achieve free tension between the first and second 3-roll rolling mills throughout the rolling schedule.

[0015] Therefore, the gear ratios of the first and second gear trains were determined so that the rolling schedule would be on the tension side. However, since the amount of tension varies depending on the rolling schedule, rolling schedules in which large tension is generated cause problems such as twisting of the bar and a decrease in yield due to variations in product width in the longitudinal direction.

The present invention has been made to eliminate these drawbacks, and provides a three-roll rolling mill that can be incorporated into a two-roll rolling mill.

[0017]

[Means for Solving the Problems] The gist of the present invention is to provide a rolling mill for bar stock, in which two three-wheel mills are arranged with roll arrangements shifted 60 degrees from the rolling axis of the material to be rolled.
A gear train and a universal joint are connected to each roll rolling mill, and the two universal joints can be connected to two roll drive shafts for driving one two-roll rolling mill, and within one gear train. This is a three-roll rolling mill that can be incorporated into a two-roll rolling mill and is characterized by being equipped with a one-way clutch.

[0018]

[Operation] That is, the present invention avoids the generation of large tension in the first and second three-roll rolling mills, which is a drawback of the invention shown in FIG. The feature of this is that the first or second 3
A one-way clutch is installed in one of the gear trains of the rolling mill.

First, when a one-way clutch is installed in the gear train of the first 3-roll rolling mill, the volume of bar passing through the second machine per unit time must be greater than a certain value than that of the first machine. It is necessary to select the gear ratio and roll diameter of each gear train so as to increase the size of the roll.

[0020] In this case, while the bar material is being bitten only in the first 3-roll rolling mill, the gear train of the first machine is
The rolling torque of the roll rolling mill is transmitted, but when the bar gets caught in the second 3-roll rolling mill, the rolling torque of the second 3-roll rolling mill as well as that of the first 3-roll mill is transmitted. The rolling torque is also borne by the second gear train.

In other words, the one-way clutch operates in the first three-roll rolling mill, and the driving force is not transmitted from the spindle, so the tension between the first and second three-roll rolling mills is 100% The rolling torque is covered. The tension at this time is characterized by an extremely small value compared to the tension generated in the case of the invention shown in FIG. 8 described above.

Next, a case will be explained in which a one-way clutch is provided in the gear train of the second three-roll rolling mill. In this case, the volume of bar material per unit time is 1
It is necessary to select the gear ratio and roll diameter of each gear train so that the first unit is larger than the second unit by a certain value or more.

[0023] When the bar material is caught only in the first 3-roll mill, the first gear train transmits the rolling torque of the first 3-roll mill, but the rolling torque of the second 3-roll mill is When the rolling mill is bitten, not only the rolling torque of the first 3-roll rolling mill but also the rolling torque of the second 3-roll mill is 1
The burden is borne by the second gear train.

In other words, the one-way clutch operates in the second 3-roll rolling mill, and the driving force is not transmitted from the spindle, so the pushing force between the first and second 3-roll rolling mills is used to generate 100% rolling torque is covered. The pressing force at this time is also characterized by an extremely small value.

FIG. 4 shows a double rolling mill in which a one-way clutch is installed in the gear train of the second 3-roll mill to increase the passing volume of bars per unit time in the first mill. 4 is a drawing showing experimental results of changes in rolling torque (FIG. 4(A)) and pushing force (FIG. 4(B)).

It can be seen that the one-way clutch is operating when the material passing volume per unit time of the first machine increases by 3% compared to the second machine. The tensile stress σF (pushing stress when negative) generated between the first and second units at this time is 24% of the average deformation resistance σm of the bar, and the absolute value of the tensile stress when there is no one-way clutch. very small compared to. Another advantageous point is that this pressing stress does not change even if the area reduction rate of each three-roll rolling mill is changed.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described in detail below with reference to the drawings, using an example in which a one-way clutch is disposed within the gear train of a second three-roll rolling mill.

FIG. 1 is a diagram illustrating the drive transmission path of the gear train, and is a perspective view showing the drive gear train of two three-roll rolling mills from the universal joint of the two-roll drive shaft.

The rolls 8 fixed to the roll shafts 11 of the three rolls are arranged perpendicularly to the universal joint 18a of the two-roll rolling mill while protecting the rolling pass line.
Based on this, the other two rolls 9 and 10 are arranged at intervals of 120 degrees.

Roll shaft 1 of the first three-roll rolling mill 34
1, and the input gear 20 which is directly connected to the universal joint 18a of the roll rolling mill, but since the rolling direction and the roll rotation direction are opposite, it is necessary to connect the idle gear 21. Set it up during this time.

The drive is transmitted via the universal joint 18a of the two-roll rolling mill, → input gear 20 → idle gear 21 → roll shaft gear 2 of the three-roll rolling mill.
2 → 3 roll rolling mill roll shaft 11 → each bevel gear 1
2 and 15 to each role.

The roll 8a fixed to the drive shaft of the second 3-roll rolling mill 35 is symmetrical to the roll 8 fixed to the drive shaft of the first machine with respect to the line center, and is placed downstream in the direction of movement of the bar 31. The other two rolls (not shown) are installed in the same way as the first roll.

The three roll assemblies, the first and second roll assemblies, are arranged with their phases shifted by 60 degrees with respect to the rolling axis. With this arrangement, the roll shaft 11a of the second three-roll rolling mill
and another universal joint 19a of the two-roll rolling mill are connected by a gear train via an idle gear 24 in the same way as in the first mill.

The one-way clutch 37 is installed in the input gear 23 of the second three-roll rolling mill 35, and is shown in FIG.
3 is a detailed view showing the installation situation, and FIG. 3 is a sectional view showing the principle of the one-way clutch 37.

The principle is the application of a wedge, and in the example shown in FIG. 3(B), when the number of rotations of the outer ring 38 is greater than the number of rotations of the inner ring 39, the wedge 40 comes off and the outer ring 38 and the inner ring 39 idle, causing Otherwise, the effect of the wedge 40 connects the outer ring 38 and the inner ring 39 and transmits force.

The operation of the one-way clutch 37 will now be explained. Until the bar 31 is bitten into the second 3-roll rolling mill 35, the rotational speeds of the outer ring 38 and inner ring 39 are the same, and the effect of the wedge 40 connects the universal joint 19a and the input gear 23, so the rolls rotate. be done.

When the bar 31 is caught in the second three-roll rolling mill 35, the number of revolutions of the input gear 23 becomes greater than the number of revolutions of the universal joint 19a, so the outer ring of the one-way clutch 37 is rotated as described above. The rotation speed of 38 becomes higher than the rotation speed of inner ring 39, and the wedge 40 comes off.
Slip occurs within the one-way clutch 37.

[0038] Even if there is no one-way clutch 37 and nothing connecting the universal joint 19a and the input gear 23, rolling similar to that of the present invention is possible.
Since the bar 31 is caught in the state where the roll 8a is not rotating, the roll 8a is scratched, causing roll flaws.

The present invention incorporates the 3-roll rolling mill into the 2-roll rolling mill in exactly the same way as changing the stands of the 2-roll rolling mill by housing two 3-roll rolling mills and the gear train in one housing. This made it possible.

Next, stand rearrangement will be explained.

FIG. 5 shows the present invention in a conventional vertical 2
An example in which a two-stand three-roll rolling mill is incorporated into the rolling mill is shown. FIG. 6 is a plan view showing the exchange state in the sliding method from a three-roll rolling mill to a two-roll rolling mill.

First, we will describe the sequence of operations in which a 3-roll rolling mill set in a rolling line is taken out and replaced with a 2-roll rolling mill.

A three-roll rolling mill 33 is installed at rolling position D. The two-roll rolling mill 32 is set at standby position A. When recombination begins, the three-roll rolling mill is first taken out from rolling position D to position B with the recombination cylinder 29 in FIG.

Thereafter, the two-roll rolling mill at position A and the three-roll rolling mill at position B are simultaneously slid to positions B and C, respectively, by the sliding carriage 30 shown in FIG. Furthermore, the two-roll rolling mill at position B is shown in Figure 5.
It is assembled into the rolling position D by the reassembled cylinder 29 shown in FIG. The slide cart then returns to its original position, completing the reassembly.

Similarly, when changing the turntable system, replacing a 3-roll rolling mill with a 2-roll rolling mill requires 2 steps.
This can be done in exactly the same way as changing the rolls of a roll rolling mill.

The procedure for rearranging a two-roll rolling mill in a rolling line into a three-roll rolling mill can be carried out by the above-mentioned reverse operation, but the next step is to connect the three-roll rolling mill after it has been drawn into the rolling line by the rearranging cylinder 29. Describe the operation.

First, the three-roll rolling mill set at position B is pulled into the rolling line by the reassembled cylinder 29. At this time, universal joint 18
a, 19a are lifted upward by a spindle support 26, and when the three-roll rolling mill is set on the rolling line, the spindle support 26 is lowered, and the yoke part 27 of the universal joint 18 is moved to the oval part of the roll. The cover, two-roll drive unit, and three-roll rolling mill are connected.

The three-roll mill is assembled into a two-roll mill in exactly the same manner as the roll change of a two-roll roll assembly. Therefore, the rolls of the 3-roll rolling mill and the 2-roll roll assembly can be changed freely.

The rolling power is transmitted through the main drive motor 1 - bevel reducer 2 - reducer 3 - pinion stand 4 to the drive shafts 18 and 19 of the two rolls and the universal joint 18.
a, 19a.

The transmission of power after the universal joints 18a, 19a is as described above.

[0051] When installed in a horizontal two-roll rolling mill, the structure is such that this mechanism is rotated 90 degrees.

[0052]

Effects of the Invention Conventionally, two-roll rolling mills and three-roll rolling mills each have separate drive systems, and normally three-roll rolling mills have two
It is installed on the rear side of the roll rolling mill, and has been thought to be a completely different rolling mill.

According to the present invention, the 3-roll rolling mill and the 2-roll rolling mill can be easily installed in the same drive system, so the 2-roll rolling mill and the 3-roll rolling mill can be freely exchanged.
When adding a 3-roll rolling mill to an existing 2-roll rolling mill,
This can be done easily and inexpensively, and at the same time, rolling mills can be freely switched according to the purpose, greatly improving the degree of freedom of operation.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a drive gear train of two three-roll rolling mills from a universal joint of two-roll drive shafts according to an embodiment of the present invention.

FIG. 2 is a side view showing the installation of a one-way clutch in a second three-roll rolling mill.

FIG. 3 shows the principle of a one-way clutch, with (A) being a horizontal sectional view and (B) being a partially detailed sectional view.

FIG. 4 is a drawing showing the experimental results of changes in rolling torque (A) and pushing force (B) when a one-way clutch is provided and the passing volume of the bar is changed.

FIG. 5 is a side view illustrating the incorporation of a three-roll rolling mill into a vertical two-roll rolling mill.

FIG. 6 is a diagram illustrating an exchange route from a three-roll rolling mill to a two-roll rolling mill.

FIG. 7 shows the roll arrangement of two conventional three-roll rolling mills, in which (A) is a plan view and (B) is a front view.

FIG. 8 shows the drive system of another conventional two-roll rolling mill,
(A) is a perspective view thereof, and (B) is an explanatory diagram of a three-roll rolling mill using the stand recombination device as is.

[Explanation of symbols]

1, 5 Motor 2 Bevel reducer 3, 6 Reducer 4 Pinion stand 8, 8a, 9
, 9a, 10, 10a Rolls 11, 11a Roll shafts 12, 15 Bevel gears 14, 17 Roll shafts 18, 19 Drive shafts 18a, 19a Universal joints 20, 23
Input gear 21, 24 Idle gear 22, 25 Roll shaft gear 26 Spindle support 27, 28
Yoke 29 Recombinant cylinder 30
Slide cart 31 Rolled material (bar material) 32
2-roll rolling mill 33 3-roll rolling mill 34 1st 3-roll rolling mill 35
Second 3-roll rolling mill 36
Rail 37 One-way clutch 38
Outer ring 39 Inner ring 40 Wedge

Claims (1)

[Claims] 1. In a bar rolling mill, a gear train and a universal joint are connected to each of two 3-roll mills in which the roll arrangement is arranged with a phase shift of 60 degrees with respect to the rolling axis of the rolled material, 2. The two universal joints can be connected to two roll drive shafts for driving one two-roll rolling mill, and a one-way clutch is provided in one gear train.
A 3-roll rolling mill that can be incorporated into a rolling mill.