JPS62173008A - Single shaft planetary rolling mill - Google Patents

Abstract

PURPOSE:To simplify construction and to prevent the fluctuation of a sheet thickness and the formation of wave patterns by constructing a back up roll to a variable crown roll and a stationary plate having a recessed surface to a stationary plate having variable recessed surfaces and adjusting either of the variable crown or variable recessed surface. CONSTITUTION:The back up roll 1 is constituted to an assembly type roll consisting of an arbor and sleeve and the bulge of the sleeve is variably controlled by introducing a high-pressure oil into a pressure chamber 111 from the outside. A pressure chamber 44 is provided on the stationary plate 4 side as well and the thickness control is executed by the pressure control of a pressure medium. The construction is thereby made simple and secure and the fluctuation of the sheet thickness and the formation of the wave patterns are prevented. The need for a finishing mill is eliminated an the initial cost and floor space are considerably reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a uniaxial planetary rolling mill that rolls a rolled material by passing it between a planetary work roll and a concave fixed platen.

(b) Prior Art There are various types of planetary rolling mills, such as Sensima planetary rolling mills, Brazza planetary rolling mills, and single-shaft planetary rolling mills. moreover,
Single-axis planetary rolling mill (single planetary mill)
It is called SPM. ) include flat fixed plate type, concave fixed plate type, large diameter roll type, etc.

A typical configuration of a conventional SPM is shown in FIG. This SPM
A plurality of work rolls 2 are arranged at equal intervals around the outer circumference of the backup roll 1, a part of the outer circumference of the work roll 2 is supported by the backup block 3, and a concave fixed platen 4 and the work roll 2 are supported by the backup block 3. A rolling material 5 is passed between the two and rolled in a rolling section 6. The concave fixed platen 4 is used because
This is to reduce noise and vibration by reducing the biting angle α.

Among SPM methods other than the Platzer method, variations in plate thickness (hmin hmax), or scallops, as shown in Fig. 4 occur every time one work roll is rolled (pitch P), resulting in a noticeable wave pattern. Therefore, a finishing mill (normal type rolling mill) is installed on the exit side of the planetary rolling mill to roll the plate to a uniform thickness and eliminate the wavy pattern.

As described above, the SPM is used as a high-reduction rolling mill, but if a large diameter roll is used instead of a fixed platen, it is difficult to increase the width of the rolling stock, and scallops are inevitable. Furthermore, it is not possible to control thickness deviations in the width direction (plate crown, edge drop) and shape caused by roll deflection (mainly horizontal deflection).

In order to cope with the increase in the width of thinner products, it is necessary to increase the diameter of the work rolls and to achieve a state in which the rolled material and the work rolls are in contact with one or more of them (1-2 contact). For this reason, if a concave fixed plate is used, the 1-2 contact will be easier, and if the outer diameter of the work roll revolution and the concave surface of the fixed plate are made concentric or close to a concentric circle near the exit side, scalloping will also be eliminated. can do.

However, the concave fixed platen has the disadvantage that it is difficult to cool the contact surface between the fixed platen and the rolled material, which tends to cause seizure during hot rolling. In order to solve this problem, a thin plate tool is attached to the concave surface of the fixed platen, and furthermore, as shown in FIG. Methods such as circulating cooling water have been proposed.

This made it possible to realize a downsized SPM71)'' that eliminated the need for a finishing mill to eliminate scallops, but it still required control of the shape (apparent flatness) and profile (cross-sectional plate thickness distribution) of the rolled material. Since there is no means to do so, the apparent flatness becomes wavy, such as ear waves or mid-stretching, and the defects that result in a profile as shown in FIG. 6 have not been resolved.

The Platza method has a complex structure in which an intermediate roll is placed inside the work roll.The revolution of the intermediate roll does not follow a circular path over the entire circumference, but instead follows a straight path at the final stage of rolling. The work rolls on both sides move linearly in parallel over a certain section to prevent plate thickness fluctuations.

In this way, the Plazza method can prevent plate thickness fluctuations, but because of its complicated structure, it is less strong than other methods, and there are many restrictions on rolling speed, material size, material deformation resistance, etc. Another disadvantage is that the production and maintenance costs are high. Other methods also have the disadvantage of requiring a finishing mill.

(c) Problems to be Solved by the Invention The problems to be solved by the present invention are to obtain a single-shaft planetary rolling mill that makes it possible to control the shape and profile of a rolled material during rolling.

B) Means for Solving the Problems The uniaxial planetary rolling mill of the present invention arranges a plurality of planetary work rolls around the outer periphery of a backup roll, and
A single-axis planetary rolling mill in which a concave fixed platen is provided opposite to the roll, a backup block is provided to support the work roll, and a rolling material is passed between the work roll and the concave fixed platen to perform rolling, The backup
The roll is configured as a variable crown roll whose roll crown is variably controlled by a pressure medium, the concave fixed plate is configured as a variable concave fixed plate whose concave shape is variably controlled by a pressure medium, and the variable crown and variable concave surface are The above problems are solved by controlling the shape and profile of the rolled material by adjusting at least one of them.

(e) Example A single-shaft planetary rolling mill of the present invention will be explained with reference to the drawings. As shown in FIGS. 1 and 2, the uniaxial planetary rolling mill 1 of the present invention has a plurality of work rolls 2 arranged at equal intervals around the outer circumference of a backup roll 1.
A part of the outer periphery of the workpiece is supported by a backup block 3, and a rolling material 5 is passed between the concave fixed platen 4 and the work roll 2 to perform rolling.

The backup roll 2 is configured as a variable crown roll which will be described later. The concave surface identification board 4 is configured to have a variable concave surface, which will be described later.

As a means to control the roll deflection of the SPM work roll 2, the backup roll 1 is made into a variable crown roll (hereinafter referred to as a VC roll). An example thereof is shown in FIG. The backup roll 1 is configured as an assembled roll consisting of an arbor 11 and a sleeve 12, and the expansion of the sleeve 12 is variably controlled by introducing high pressure oil from the outside.

Since the work roll 2 is thinner than that of a normal rolling mill, the deflection of the work roll 2 can be easily controlled. Also,
Since the rolling load of SPM is significantly smaller than that of conventional rolling mills, it becomes easier to design VC rolls, and it becomes possible to manufacture highly effective VC rolls.

Although the VC roll with one pressure chamber 111 is shown in FIG. 1, since the work roll 2 is thin, it is also possible to form a plurality of pressure receiving chambers and perform complicated deflection control.

However, the swelling of the backup roll 1 alone is insufficient to control the thickness distribution, especially at the edge portion of the sheet width.

Therefore, as shown in FIG. 1, a pressure chamber 44 is also provided on the side of the fixed platen 4, and the thickness is controlled by controlling the pressure of the pressure medium. Since the fixed platen 4 does not need to be rotated, it is easy to provide a large number of pressure chambers (in the plate width direction and in the longitudinal direction) and to control the pressure individually, making it possible to perform highly accurate control.

An example thereof is shown in FIG. Since the pressure chamber 44 can be installed at any position on the fixed platen 4 (in the plate width direction, rolling direction),
Appropriate designs according to rolling conditions (cold, hot, soft, hard, narrow width, wide width, etc.) can be realized relatively easily.

Diameter 200mm x length 460m, m backup
In roll 1, the sleeve thickness is 20 mm and the pressure chamber length is 25 mm.
A fixed platen type SPM rolling experiment was conducted using a work roll 2 with a diameter of 45 mm and a VC roll with a diameter of 0 mm. V
C-roll has a maximum weight of 500 kg/CTL and a swelling amount of about 70 μ. The concave fixed platen 4 has a portion concentric with the revolution diameter of the work roll 2 on the exit side, making it possible to eliminate scallops. With this SPM, the plate thickness is 1. A lead material with an ommx width of 150 strips was rolled at a reduction rate of 90%.

In normal rolling, both ends of the sheet width become thinner rapidly, as shown by curve A in FIG. However, backup
The internal pressure of roll 1 is 400 kg/cr! and about 55μ
When rolled with a swelling amount of , it becomes like curve B,
Although the profile is considerably improved, thinning of the edges still remains.

Therefore, as shown in Fig. 1, a pressure chamber 44 is provided on the fixed platen side at a position corresponding to the center of the plate width, so that the pressure of both the back amplifier roll 1 and the fixed platen 4 can be adjusted. Rolled. As a result, we succeeded in making the plate thickness distribution almost uniform, as shown by curve C in Figure 9, under the conditions that the backup roll 1 had a bulge of about 30μ and the fixed plate had a bulge of about 15μ. did.

Regarding the shape, it was also confirmed that as the pressure of the backup roll 1 was increased, the shape changed from an ear wave to a medium elongation, as in normal rolling.

Next, the fixed platen 4 was water-cooled to enable hot rolling, and the same experiment was conducted. A lubricant containing 50% boric acid and 50% graphite was used in combination with water cooling. As a result, it was confirmed that hot rolling was possible without seizure, and that the shape and profile could be controlled in the same way as lead materials.

(Chi effect) According to the present invention, the structure of the fixed platen type single-shaft planetary rolling mill becomes simple and strong, and it is possible to prevent plate thickness fluctuations and wave patterns peculiar to planetary rolling, so a finishing mill is no longer necessary. , equipment costs and installation space are significantly reduced.Furthermore, the shape and profile of the rolled material can also be controlled during rolling.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a single-shaft planetary rolling mill of the present invention. FIG. 2 is a longitudinal sectional view taken along the IT-II line in FIG. 1. FIG. 3 is a longitudinal sectional view of a conventional single-shaft planetary rolling mill. FIG. 4 is an exaggerated longitudinal cross-sectional view of a product rolled by a conventional planetary rolling mill. Figure 5 is a cross-sectional view of a conventional fixed platen. FIG. 6 is a cross-sectional view of a rolled material rolled by a conventional uniaxial planetary rolling mill. FIG. 7 is a longitudinal sectional view of the backup roll of the present invention. FIG. 8 is a cross-sectional view of another fixed platen of the present invention. FIG. 9 is a graph showing a cross section of a rolled material. 1: Backup roll 2: Work roll 3: Backup block 4: Fixed platen 5: Rolled material
11: Arbor] 2 Nisleeve
41: Thin plate tool 42: Concave surface 43: Waterway 44: Pressure chamber Patent applicant: Sumitomo Metal Industries, Ltd. (5 others)

Claims (1)

[Claims] A plurality of planetary work rolls are arranged around the outer periphery of the backup roll, a concave fixed platen is provided opposite to the work rolls, and the backup roll supports the work rolls.
In a single-shaft planetary rolling mill in which a block is provided and rolling material is passed between the work roll and the concave fixed platen, the backup roll is a variable crown roll whose roll crown is variably controlled by a pressure medium. and the concave fixed platen is configured as a variable concave fixed plate whose concave shape is variably controlled by a pressure medium, and the shape and profile of the rolled material are adjusted by adjusting at least one of the variable crown and the variable concave surface. A single-shaft planetary rolling mill characterized by control.