JPH0763734B2 - Temper rolling mill and temper rolling method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a temper rolling mill and a temper rolling method.

[Prior Art] When a metal strip is manufactured by temper rolling, there is a method of keeping the surface of a roll to be used clean in order to maintain surface texture and prevent flaws generated due to processing on the plate surface. As one of the means, foreign substances adhering to the surface of the roll may be constantly removed by various polishing means. JP-A-57-75212 proposes a means for removing dust on the surface of the work roll by using a brush roll and discharging this dust out of the system by a suction means.

[Problems to be Solved by the Invention] However, in the prior art, the target roll is limited to the work roll, and in this method, it is not possible to completely remove foreign matter adhering to the roll, Further, the contamination of the metal strip caused by the foreign matter cannot be avoided. That is, for example, when producing a dull steel plate, the surface roughness of the work roll is taken large by an appropriate means, and the hardness of the backup roll is generally low. May occur. Therefore, the effect on the surface of the steel sheet cannot be prevented unless measures are taken to always remove foreign matter on the backup roll by an appropriate means.

Further, when the roll diameter of the roll to be polished and / or the brush roll diameter is changed, there is a problem that the polishing ability or the exhaust suction flow velocity fluctuates or the duct comes into contact with the roll to be polished.

When the roll rotation of the temper rolling mill is stopped, brush marks are generated on the roll unless the brush roll is stopped.
Further, if the brush roll is stopped prior to the rotation of the roll, the above-mentioned surface flaw will occur.

Even when reassembling the rolls to be polished, there was no consideration for retreating the brush roll including the exhaust duct before reassembling, advancing the brush roll including the exhaust duct after reassembling, and adjusting each position. .

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a means for removing foreign matter generated in a rolling roll to such an extent that the surface of a steel sheet is not affected.

[Means for Solving the Problems] (1) In a temper rolling mill, a brush roll that comes into contact with a work roll and a backup roll of the temper rolling mill and rotates in the opposite direction to the roll is provided, and the brush is used. A temper rolling mill characterized by arranging an exhaust duct close to the rolls.

(2) In a temper rolling mill, a brush roll that comes into contact with a work roll and a backup roll of the temper rolling mill and rotates in the opposite direction to the roll is arranged, and an exhaust duct is arranged close to the brush roll. A temper rolling mill comprising the duct and the brush roll equipped with a forward / backward moving mechanism.

(3) A brush roll that comes into contact with a work roll and a backup roll for temper rolling and that rotates in the opposite direction to the roll is arranged, and an exhaust duct is arranged in the vicinity of the brush roll. A temper rolling method characterized in that the suction flow velocity between the backup roll and the brush roll is set to 5 m / sec or more.

(4) A brush roll that comes into contact with a work roll and a backup roll for temper rolling and rotates in a direction opposite to the roll is arranged, and an exhaust duct is arranged in the vicinity of the brush roll. Equipped with a forward / backward movement mechanism, the forward / backward movement mechanism is moved individually or simultaneously to adjust polishing and exhaust suction flow rate during temper rolling operation, reverse movement during night rolling of temper refining, and reverse movement and forward movement during roll rearrangement. A temper rolling method characterized by being carried out.

[Operation] The temper rolling mill and the temper rolling method according to the present invention contact the work rolls and backup rolls of the temper rolling mill to remove foreign matter attached to both rolls by the brush roll rotating in the opposite direction to the roll. Always remove. Further, the foreign matter is discharged out of the system by a duct including the brush roll. Further, in order to improve the efficiency of removal and discharge, a forward / backward moving mechanism is attached to the duct to adjust the distance between the duct and the work roll and the backup roll.

Furthermore, the exhaust suction flow rate of the brush roll is set to 5 m / sec or more to improve the efficiency of removal and discharge.

In addition, the efficiency of the roll reshuffling and the work before and after the roll reshuffling is improved.

[Embodiment] FIG. 1 is an explanatory view showing an embodiment of the present invention. The metal strip 1 is unwound from a pay-off reel (not shown), passes through a deflector roll 2, and is temper-rolled.
And is wound by a tension reel via a deflector roll 4.

The rolling mill has a work roll 5 and a backup roll 6.
The brush rolls 7 and 8 remove foreign matter on both rolls. The brush roll is arranged on the inlet side of the work roll 5 and on the outlet side of the backup roll 6. A duct 9 that encloses the brush roll is provided for discharging foreign matter, and a blower 10 is attached to the outlet side thereof to discharge the foreign matter on both rollers to the outside of the system.

Table 1 is a table showing the results of actual machine tests comparing the method of the present invention with the conventional method. The test conditions in this test are as shown below.

Work Roll: Material; Forged Steel, Hardness; Hs92 °, Surface Roughness; 2.0 ~ 2.2μR _a Backup Roll: Material; Cast Iron, Hardness; Hs68 °, Surface Roughness; 0.08 ~ 0.1μR _a Brush Roll: For Work Roll; Material Nylon, diameter 170 mm, rotation speed 350 rpm for backup roll; Material nylon (with abrasive grains), diameter 260 mm, rotation speed 400 rpm Suction flow rate: 4, 6, 8, 10 m / sec. Rolling material: Annealed cold rolled steel sheet Rolling condition: Dry pressure regulation In Table 1, when the roll surface foreign matter is removed only from the work rolls, there is a disappointment regardless of the suction flow rate. However, both work roll and backup roll surface foreign matter were removed. In case of suction flow rate 5m / s
Above ec., the downgrade is reduced to 1% or less, and the suction flow rate is 1
Degradation did not occur at 0 m / sec. Or higher.

FIG. 2 is a graph showing the relationship between the suction flow rate and the dust suction rate in the example of the present invention. Suction flow rate as shown
It has been found that 80% or more of dust is sucked at 5 m / sec. Or higher. From this, it is necessary to secure a suction flow rate of 5 m / sec. Or more.

FIG. 3 is an enlarged view of a main part of the duct near the roll shown in FIG. The brush roll 8 is enclosed by a duct 9, the opening of which is fitted with a duct hood 11.
The opening of the duct hood is changed by the power cylinder 13 via the link mechanism 12. The opening degree is related to the suction flow rate, and when the present invention is carried out, it is preferable to adjust it because the dust discharge capacity changes depending on the diameters and positions of the work roll, the backup roll, and the brush roll.

FIG. 4 is an explanatory view showing the positional relationship among the work roll, the brush roll, and the duct hood. The work roll diameter and the brush roll change due to re-polishing, and it is necessary to change the brush roll position and the duct hood opening accordingly. In FIG. 4, when the roll diameter changes from R ₁ to R ₂ , the center of the brush roll moves from A to B. At this time, in order to maintain the distance h between the duct hood and the roll, the duct hood The opening degree of is changed from a to b. Similarly, the present invention can be applied to the case where the backup roll is polished or the height is adjusted, and the case where both rolls change at the same time.

FIG. 5 shows the forward / backward moving mechanism of the duct and the brush roll. The brush roll is rotated by a rotating machine (not shown) and fixed to the duct. The duct is flexible, and is moved forward and backward by the moving motor 16. Needless to say, the forward and backward movement of the brush roll can be independently performed.

FIGS. 6 and 7 are flowcharts showing an operation of automatically changing the brush roll position and the duct hood opening degree in correspondence with work, roll change, and stop.

FIG. 6 is a flow chart from immediately before roll changing to the start of work, and FIG. 7 is a flow chart from immediately before stop of the temper rolling mill to start of work.

In Fig. 6, when the roll change (WRCHG) command is issued, the brush roll retracts to a position that does not interfere with work,
After adjusting the duct position based on the new roll diameter data together with the signal indicating the end of reclassification (at this time, the duct hood opening is also adjusted.), The brush roll moves forward and comes into contact with the rolling roll. The current is reduced until it reaches a predetermined value.

Similarly, when the backup rolls are rearranged, both rolls are rearranged at the same time, or when the height is changed by shim adjustment or the like, the duct position is adjusted based on the height data.

The same applies to the duct position adjustment based on the change in the brush roll diameter. Further, the reference adjustment of the brush roll current by the brush roll system can be appropriately performed.

In Fig. 7, when a rolling mill stop command is issued, the brush rolls retract, the rolling mills restart, and the work rolls reach 30 mpm.
When the peripheral speed reaches, the brush roll advances and contacts the work roll, and the brush roll current is reduced until the brush roll current reaches a predetermined value.

INDUSTRIAL APPLICABILITY The present invention can be applied to a line such as a heat treatment line and a plating line, and can also be applied to a multiple rolling mill having four or more rolling mills.

[Effects of the Invention] As described above, according to the present invention, the roll surface foreign matter is removed from both the work roll and the backup roll.
Since the dust is sucked at the suction flow rate of 5 m / sec, the metal plate after temper rolling does not suffer from flaws due to foreign matter, and the yield is improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention, FIG. 2 is a graph showing the relationship between the suction flow velocity and the dust suction rate in the present invention, and FIG. 3 is the duct near the roll in FIG. FIG. 4 is an enlarged view of an essential part, FIG. 4 is an explanatory view showing a positional relationship among a work roll, a brush roll, and a duct hood.
The figure shows the forward / backward movement mechanism of ducts and brush rolls. Fig. 6 shows the flow chart from immediately before roll change to the start of work.
The figure is a flowchart from immediately before the rolling mill is stopped until the work is started. 1 ... metal strip, 2 ... deflector roll, 3 ... temper rolling mill, 4 ... deflector roll, 5 ... work roll, 6 ... backup roll, 7 ... brush roll, 8 ... brush roll, 9 …… duct, 10 …… blower, 11 …… duct hood, 12 …… link mechanism, 13 …… power cylinder, 14 …… carriage, 15 …… frame, 16 …… movement motor.

Front Page Continuation (72) Inventor Masayuki Yamazaki 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd. Examiner Noboru Nakazawa (56) Reference JP-A-57-75212 (JP, A) JP Flat 2-290607 (JP, A) JP-A-2-290608 (JP, A) Actually opened 64-42704 (JP, U) Actually opened 59-162108 (JP, U)

Claims (4)

[Claims] 1. A temper rolling mill is provided with a brush roll which comes into contact with a work roll and a backup roll of the temper rolling mill and rotates in a direction opposite to the roll, and an exhaust duct is provided close to the brush roll. A temper rolling mill characterized by arranging. 2. A temper rolling mill is provided with a brush roll which comes into contact with a work roll and a backup roll of the temper rolling mill and rotates in a direction opposite to the roll, and an exhaust duct is provided close to the brush roll. And a temper rolling machine equipped with a forward / backward moving mechanism mounted on the duct and the brush roll. 3. A brush roll which comes into contact with a work roll and a backup roll for temper rolling and rotates in a direction opposite to the roll is provided, and an exhaust duct is arranged in the vicinity of the brush roll. A temper rolling method characterized in that a suction flow rate between a roll, a backup roll and a brush roll is set to 5 m / sec or more. 4. A brush roll which comes into contact with a work roll and a backup roll for temper rolling and rotates in the opposite direction to the roll is provided, and an exhaust duct is arranged in the vicinity of the brush roll. Attach the forward-backward movement mechanism to the roll, move the forward-backward movement mechanism individually or simultaneously,
A temper rolling method, characterized in that polishing and adjustment of exhaust suction flow rate during temper rolling operation, backward movement when the temper rolling operation is stopped, and backward movement and forward movement during roll rearrangement are performed.