JPH0420681B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a rolling mill for both rough rolling and finishing rolling.
In particular, the present invention relates to a combined rough rolling/finish rolling mill suitable for reverse rolling which performs finishing rolling immediately after the completion of rough rolling.

[Conventional technology]

Conventional reverse rolling has been carried out by installing a rough rolling mill for rough rolling and a finishing mill for finishing rolling, respectively, which has the disadvantage that the equipment has to be larger.

In order to eliminate the above drawbacks, rough rolling and finish rolling may be performed in one rolling mill.

By the way, the idea of using one rolling mill as a four-high rolling mill for rough rolling and a six-high rolling mill for finishing rolling is already known from Japanese Patent Publication No. 49776/1983. However, in this known rolling mill, when applied from a 4-high rolling mill to a 6-high rolling mill, an intermediate roll is inserted between a work roll and a reinforcing roll, and the work rolls are shared. .

Furthermore, no consideration was given to moving the work roll in the axial direction.

[Problem to be solved by the invention]

As in the prior art described above, when a 4-high rolling mill is used for rough rolling and a 6-high rolling mill is used for finishing rolling, the surface roughness of the work rolls that occurs during rough rolling is transferred to the surface of the rolled material, resulting in finishing There was a problem that high quality rolled products could not be obtained.

In addition, there was a problem in that the contact portion of the work roll with the rolled material was worn, and a step was formed on the surface of the work roll, making it impossible to maintain good rolling performance.

The present invention has been made in view of the above points, and its purpose is to prevent roughening of the surface of the work roll even if rough rolling and finish rolling are performed in one rolling mill. Provides a rolling mill for rough rolling and finishing that can obtain high-quality rolled products without being transferred to the surface, prevent deterioration of rolling performance due to wear of work rolls, and maintain good rolling performance. It's about doing.

[Means to solve the problem]

In the present invention, first upper and lower work rolls that perform rough rolling, upper and lower reinforcing rolls that respectively support the first upper and lower work rolls, and a removable first and upper work roll that performs finish rolling are installed between the first and upper work rolls. a second vertical work roll, a shift means for moving the first vertical work roll in the axial direction, a project block that incorporates a first cylinder device and is movable up and down, and a mill housing that incorporates a second cylinder device. and a project block fixed to the first block, and the vertically movable project block is fixed to the first block.
The first upper and lower work rolls are raised and lowered together with the vertically movable project block, and when the second upper and lower work rolls are removed, rough rolling is performed; The above object is achieved by performing finish rolling using the first upper and lower work rolls as upper and lower intermediate rolls when the upper and lower work rolls are attached.

[Effect]

In the present invention, by performing rough rolling and finish rolling using separate work rolls, it is possible to prevent the rough surface of the work rolls that occurs during rough rolling from being transferred to the surface of the rolled material, and to obtain a high-quality product. I can do it. Furthermore, by moving the work roll in the axial direction during rough rolling, wear of the contact portion of the work roll with the rolled material can be dispersed, and good rolling performance can be maintained.

〔Example〕

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

FIG. 1 shows the configuration of a four-high rolling mill that performs rough rolling. The upper work roll 1 is moved by a balance cylinder 5 (the balance cylinder can be a bender) built into an upper movable project block 3 that moves up and down. It is raised and lowered by a reduction screw 8 provided at the upper part of the mill housing 7 in contact with the upper reinforcing roll 6.

On the other hand, the lower work roll 2, like the upper work roll 1, is raised and lowered by a lifting screw 10 provided at the lower part of the mill housing 7 by means of a lower movable project block 4 and a lower reinforcing roll 9.

Further, a fixed project block 12 is disposed in the pass line portion of the mill housing 7.

FIG. 2 shows the configuration of a six-high rolling mill that performs finish rolling. The difference from FIG. The upper intermediate roll 1 is moved by the built-in balance cylinder 13.
a, and this upper intermediate roll 1a is
This is the same product as the upper work roll 1 during rough rolling shown in FIG.

Of course, the lower intermediate roll 2a is also the same product as the lower work roll 2 during rough rolling shown in FIG. 1, as described above.

Immediately after rough rolling, when switching from FIG. 1 to FIG. 2 for finish rolling, the upper and lower work rolls 1 and 2 in FIG. 1 are replaced by the upper and lower small-diameter work rolls 11 and 1 in FIG.
To obtain space to insert 4, upper work roll 1
is raised by a reduction screw 8 provided at the upper part of the mill housing 7. At the same time, the lower work roll 2 is lowered by a lifting screw 10 provided at the lower part of the mill housing 7.

Thereafter, the upper and lower small-diameter work rolls 11 and 14 are inserted from the operating side of the rolling mill using a roll changing device (not shown), and the upper and lower reinforcing rolls 6 and 9 are rolled down and rolled up, respectively, to bring all the rolls into contact with each other, as shown in FIG. The composition is as follows.
In other words, when the upper and lower work rolls 1 and 2 are used as a 6-high rolling mill, the upper and lower intermediate rolls 1 and 2 are
a, 2a.

Immediately after the rough rolling is completed, the upper and lower small diameter work rolls 11, 1
The reason for incorporating 4 is that in rough rolling, the maximum rolling reduction per pass is about 40 mm, which requires a large-diameter work roll to facilitate biting of the rolled material, while in finishing rolling, the rolling reduction per pass is approximately 40 mm. There is no need for a reduction amount such as rolling, and the upper and lower small diameter work rolls 11, 1
This is because strong rolling is possible by using No. 4, and according to this embodiment, the diameter of the work roll can be used differently for rough rolling and finish rolling, improving the workability of biting the rolled material during rough rolling, and In finish rolling, it is possible to roll a thin material of about 2 mm with strong reduction.

In addition, since the upper and lower small-diameter work rolls 11 and 14 are used exclusively for finish rolling, there is very little roll roughness and the surface of the rolled material is always kept in good quality, making it possible to obtain high-quality products.

In addition, the upper movable project block 3 and the lower movable project block 4 shown in FIGS.
The rollers move up and down in the same way as the upper and lower reinforcing rolls 6 and 9, and the built-in balance cylinder 5 provides stable movement between the upper and lower reinforcing rolls 6 and 9 and the upper and lower work rolls 1 and 2, or the upper and lower small diameter work rolls 11 and 14. This method obtains contact pressure, and has the effect of enabling more effective torque transmission between each roll, especially when driving intermediate rolls in a six-high mill.

On the other hand, as shown in FIG. 3, the upper movable project block 3 is attached to the mill housing 7 with a keeper plate 15 and is capable of vertical movement while sliding. Furthermore, the shift cylinder 17 built into the shift frame 16 attached to the upper movable project block 3 makes it extremely easy to shift (shift) the 4-stage upper work roll 1 or the 6-stage upper intermediate roll 1a in the axial direction. possible. The same applies to the lower work roll 2 and the lower intermediate roll 2a.

The necessity of a mechanism to move the work rolls in the axial direction is as shown in Fig. 4 during rough rolling.
As shown in FIG. 6, which shows the details of part B, the upper and lower work rolls 1 and 2 are worn at the portions that come into contact with the rolled material 18, resulting in a difference in level from the portion of the normal work roll diameter. In the finish rolling shown in FIG. 5, the intermediate rolls 1a and 2a are used as they are, so the contact state between the upper intermediate roll 1a and the upper work roll 11 is as shown in FIG. The contact pressure of the stepped portion of the roll 1a with the upper work roll 11 locally becomes abnormally high, causing damage to the work roll. For this reason, during rough rolling, the upper and lower work rolls 1 and 2 are each moved in the axial direction by a shift device (not shown) to disperse the worn step portions of the work rolls.

During finish rolling, the upper and lower work rolls 1 and 2 used during rough rolling are used as upper and lower intermediate rolls 1a and 2a, so the intermediate roll shift is performed, that is, the known HC-mill (see JP-A-50-19510).
becomes.

In addition, the upper and lower small diameter work rolls 11, 1 during finish rolling
4 can be easily shifted by a dedicated axial movement mechanism attached to the mill housing 7.

In FIGS. 4 and 5, the rolls are driven via a roll drive spindle 19. A roll drive spindle 1 drives the large-diameter upper and lower work rolls 1 and 2 during rough rolling.
9 is the upper and lower work rolls 1 and 2 during finish rolling.
The driving spindle 1 of the upper and lower intermediate rolls 1a and 2a
9, it is possible to avoid the drawback that the driving force cannot be increased due to strength constraints, which is a problem when directly driving the new upper and lower small diameter work rolls 11 and 14.

By adopting this embodiment, roll surface roughness during rough rolling is not transferred to the surface of the rolled material, and the rolling mill is equivalent to a conventional reverse rolling mill in which a rough rolling mill and a finishing mill are installed separately. product quality can be obtained, and the equipment can be downsized by using a single stand. Further, by providing a movable project block equipped with a roll shift mechanism, it is possible to easily obtain a roll shift mill regardless of whether it is a 4-high rolling mill or a 6-high rolling mill. Furthermore, since the plate crown can be controlled without causing damage to each roll, there is also the effect that a highly accurate product can be obtained.

〔Effect of the invention〕

According to the rolling mill for both rough rolling and finishing rolling of the present invention as described above, even if rough rolling and finishing rolling are performed in one rolling mill, the surface roughness of the work rolls may be caused on the surface of the rolled material. will not be transcribed,
This has the effect that high quality rolled products can be obtained. Further, there is an effect that wear of the contact portion of the work roll with the rolled material can be dispersed, and good rolling performance can be maintained.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a four-high rolling mill showing a situation in which a rolling mill, which is an embodiment of the present invention, is used for rough rolling, and Fig. 2 is a longitudinal sectional view of a rolling mill, which is an embodiment of the present invention, used for finishing rolling. Longitudinal cross-sectional view of the 6-high rolling mill showing the situation in which it was used, No. 3
The figure is a cross-sectional view corresponding to line A-A in Figures 1 and 2, Figure 4 is a side view of the four-high rolling mill in Figure 1 as seen in the roll axis direction, and Figure 5 is the same as in Figure 2. 6 is a detailed view of section B in FIG. 4, FIG. 7 is a detailed view of section C in FIG. FIG. 6B is a diagram showing the contact pressure situation between the roll and the upper work roll, and b shows the contact pressure situation between the upper intermediate roll and the upper work roll in the case of roll shift. 1...Upper work roll, 1a...Upper intermediate roll,
2...Lower work roll, 2a...Lower intermediate roll, 3...
...Upper movable project block, 4...Lower movable project block, 5...Balance cylinder,
6... Upper reinforcement roll, 7... Mill housing, 8
……Downloading screw, 9…Lower reinforcing roll, 10
...pressure screw, 11...small diameter upper work roll, 12...fixed project block, 13...
... Balance cylinder, 14 ... Small diameter lower work roll, 15 ... Keeper plate, 16 ... Shift frame, 17 ... Shift cylinder, 18 ...
Rolled material, 19...Roll drive spindle.

Claims (1)

[Scope of Claims] 1. First upper and lower work rolls that perform rough rolling, upper and lower reinforcing rolls that respectively support the first upper and lower work rolls, and installed between the first upper and lower work rolls,
a removable second upper and lower work roll that performs finish rolling; a shift means that moves the first upper and lower work roll in the axial direction; a project block that incorporates a first cylinder device and is movable up and down; and a project block having a built-in cylinder device and fixed to the mill housing, and the vertically movable project blocks are respectively engaged with the first upper and lower work rolls, so that the first upper and lower work rolls are connected to the first upper and lower work rolls. It is raised and lowered together with a vertically movable project block, and when the second upper and lower work rolls are removed, rough rolling is performed, and when the second upper and lower work rolls are attached, the first upper and lower work rolls are used as upper and lower intermediate rolls for finishing. A rolling mill that is used for both rough rolling and finishing rolling. 2. In what is stated in claim 1,
The roll diameter of the second upper and lower work rolls is the same as that of the first upper and lower work rolls.
A rolling mill for both rough rolling and finishing rolling, characterized in that the roll diameter is smaller than the roll diameter of the upper and lower work rolls.