JPH02290606A - Skin pass rolling mill and skin pass rolling method - Google Patents

Abstract

PURPOSE:To eliminate a foreign matter on the roll surface of a rolling roll by placing a brush roll which comes into contact with a work roll and backup roll and rotates in reverse and an exhaust duct in the vicinity thereof. CONSTITUTION:A skin pass rolling mill 3 is constituted of a work roll 5 and a backup roll 6, and a foreign matter on both the rolls 5, 6 is eliminated by brush rolls 7, 8. The brush roll 7 and the brush roll 8 are provided on the inlet side as to the work roll 5 and the outlet side as to the backup roll 6, respectively. In order to discharge a foreign matter, a duct 9 including the brush roll 7 is provided, and in its outlet side, a blower 10 including the brush roll 8 is installed, and a foreign matter on both the rolls 5, 6 is discharged to the outside of the system. Accordingly, a flaw caused by a foreign matter of a metallic plate 1 after skin pass rolling is not generated, and the yield can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a skin pass rolling mill and a skin pass rolling method. [Prior Art] When manufacturing metal strip by temper rolling, there is a method of keeping the surface of the rolls used clean in order to maintain the surface quality and prevent flaws that occur during processing on the sheet surface. One way to do this is to constantly remove foreign matter adhering to the roll surface using various grinding means. Japanese Patent Laid-Open No. 57-75212 proposes a method for removing dust from the surface of a work roll using a brush roll and discharging this dust out of the system using a suction means. [Problems to be Solved by the Invention] However, in the conventional technology, the target rolls are limited to work rolls, and this method cannot completely remove foreign substances adhering to the rolls. Furthermore, contamination of the metal strip caused by this foreign material cannot be avoided. In other words, when manufacturing dull steel plates, for example, the surface of the work roll is made to have a large surface roughness by appropriate means, and since the hardness of the backup roll is generally low, wear particles are generated by contact with the work roll. may occur. Therefore, unless measures are taken to constantly remove foreign matter on the backup roll using appropriate means, it is not possible to prevent the effect on the steel plate surface. Furthermore, when the diameter of the roll to be polished and/or the diameter of the brush roll changes, there are problems in that the polishing ability or the exhaust suction flow rate changes, or the duct comes into contact with the roll to be polished. When stopping the roll rotation of a temper rolling mill, brush marks will occur on the roll unless the brush roll is also stopped. Furthermore, if the brush roll is stopped before the roll rotates, the aforementioned surface flaws will occur. Even when replacing the rolls to be polished, there was no consideration given to the retraction of the brush roll including the exhaust duct before replacement, the advancement of the brush roll including the exhaust duct after replacement, and the adjustment of each position. ．． The object of the present invention is to solve the above problems and provide a means for removing foreign matter generated in rolling rolls to the extent that they do not affect the surface of a steel plate. [Means for Solving the Problems] (1) In a Fl quality rolling mill, a brush roll that contacts the work roll and backup roll of the temper rolling mill and rotates in the opposite direction to the rolls is provided, and the brush roll A temper rolling mill characterized by an exhaust duct placed close to the rolls. (2) In a temper rolling mill, a brush roll is provided that contacts the work roll and backup roll of the temper rolling mill and rotates in the opposite direction to the rolls, and an exhaust duct is provided close to the brush roll. A temper rolling mill comprising a forward and backward movement mechanism mounted on the duct 1 and the brush roll. (3) A brush roll is provided that contacts the work roll and backup roll of temper rolling and rotates in the opposite direction to the roll, and an exhaust duct is provided close to the brush roll, and this duct and the work roll, A temper rolling method characterized in that a suction flow velocity between a backup roll and a brush roll is set to 5 m/sec or more. (4) A brush roll is disposed in contact with the work roll of temper rolling and a back-up roll and rotates in the opposite direction to the roll, and an exhaust duct is disposed close to the brush roll, and the duct and the brush roll are disposed close to the brush roll. A forward and backward movement mechanism is attached to the holder, and the forward and backward movement mechanisms are moved individually or simultaneously to adjust the polishing and exhaust suction flow rate during temper rolling, reverse movement when the temper rolling operation is stopped, reverse movement when the rolls are rearranged, and the like. A temper rolling method characterized by carrying out forward rolling. [Function] The skin-pass rolling mill and skin-pass rolling method of the present invention contact the work roll and backup roll of the skin-pass rolling mill, and remove foreign matter adhering to both rolls by a brush roll that rotates in the opposite direction to the rolls. The brush roll is constantly removed, and the foreign matter is discharged out of the system through a duct that includes the brush roll. Further, in order to improve removal and discharge efficiency, the duct is equipped with a forward and backward moving mechanism to adjust the distance between the duct and the work roll and backup roll. Furthermore, the exhaust suction flow velocity of the brush roll portion is set to 5 m/sec or more to increase removal and discharge efficiency. In addition, we aim to improve the efficiency of roll change and the work before and after it. [Example] Figure 1 is an explanatory diagram showing an example of the present invention. The metal strip 1 is unwound from a payoff reel (not shown) and passed through a deflector roll 2 to a temper rolling mill 3.
The sheet is rolled by a roller, passed through a deflector roll 4, and then wound up by a tension reel. 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 entry side of the work roll 5 and on the exit side of the backup roll 6. In order to discharge foreign matter, a duct 9 that includes the brush roll is provided, and a blower 10 is attached to the exit side of the duct 9 to discharge foreign matter on both rolls out of the system. Table 1 shows the results of an actual machine test comparing the method of the present invention and 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. ■Backup roll: Material: Cast iron, Hardness: Hs68' Surface roughness: 0.08~0.1μR, ■Brush roll: For work roll; Material: Nylon, Diameter: 170■, Number of revolutions: 350 rpm For backup roll: Material Nylon (with abrasive grains) Diameter 260 m+m, Rotation speed 400 rpm ■Suction flow rate = 4, 6, 8, l Q m / sec. ■
Rolling material: annealed cold-rolled steel plate ■Rolling conditions: dry Pressure adjustment In Table 1, when removing foreign matter from the roll surface of only the work roll, deterioration occurs regardless of the suction flow rate. , when removing foreign matter from the roll surface of both the work roll and backup roll, the suction flow rate is 5 m.
/sec. Above, the dropout was reduced to less than 1%, and the suction flow rate was 10 m/sec. In the above cases, no downgrades have occurred. FIG. 2 is a graph showing the relationship between suction flow rate and dust suction rate in an example of the present invention. As shown, the suction flow rate is 5 m/sec. It was found that more than 80% of the dust was suctioned. For this reason, the suction flow rate is 5 m/sec. It is necessary to ensure the above. Figure 3 is an enlarged view of the main part of the duct near the roll in Figure 1. The brush roll 8 is enclosed by a duct 9, the opening of which is fitted with a duct hood 11. The opening degree of the duct hood is changed by a power cylinder 13 via a link mechanism 12. The opening degree is related to the above-mentioned suction flow rate, and when implementing the present invention, the dust discharge capacity changes depending on the diameter and position of the work roll, backup roll, and brush roll, so it can be adjusted. preferable. FIG. 4 is an explanatory diagram showing the positional relationship among the work roll, brush roll, and duct hood. The work roll diameter and brush roll change due to regrinding, and it is necessary to change the brush roll position and duct hood opening accordingly. In Fig. 4, the roll diameter is Rl to R
2, the center of the brush roll shifts from A to B, but at this time, the distance h between the duct hood and the roll
In order to maintain this, the opening degree of the duct hood is changed from a to b. Similarly, it can be applied when polishing or adjusting the height of the backup roll, or when there is a change in both rolls at the same time. Figure 5 shows the forward and backward movement mechanism of the duct and brush roll. The brush roll is rotated by a rotating machine (not shown) and fixed to the duct. The duct is extendable and retractable, and is moved forward and backward by a moving motor 16.
It goes without saying that the brush roll can be moved forward and backward independently. Figures 6 and 7 are flowcharts showing operations for automatically changing the brush roll position and duct hood opening in response to work, roll rearrangement, and stoppage. FIG. 6 is a flowchart from just before the roll rearrangement to the start of work, and FIG. 7 is a flowchart from just before the temper rolling mill is stopped to the start of work. In Figure 6, when a roll change (WRCHG) command is issued, the brush roll retreats to a position where it does not interfere with the work, and with a signal to complete the change, the duct position is adjusted based on the new roll diameter data. (At this time, the duct hood opening degree is also adjusted.) The brush roll moves forward and contacts the rolling roll, and is rolled down until the brush roll current reaches a predetermined value. Similarly, when changing the backup roll, when changing both ends at the same time, or when changing the height by adjusting shims, adjust the duct position based on the height data. The same applies to duct position adjustment based on changes in brush roll diameter. Furthermore, it is possible to appropriately adjust the brush roll current standard based on the brush roll diameter. In Figure 7, when a command to stop the rolling mill is issued, the brush roll moves backward, and when the rolling mill restarts and the work roll reaches a circumferential speed of 30 mpm, the brush roll moves forward and makes contact with the work roll. The brush roll current is then lowered until it reaches a predetermined value. The present invention can also be applied in lines such as heat treatment lines and plating lines, and can also be applied to multiple rolling mills such as quadruple rolling mills or higher. [Effects of the Invention] As described above, according to the present invention, foreign matter is removed from the roll surfaces of both the work roll and the backup roll.
Since the dust is suctioned at a suction flow rate of 5 m/sec, the metal plate after temper rolling is free from defects due to foreign matter, which has the effect of improving the yield.

This is a chart. DESCRIPTION OF SYMBOLS 1... Metal strip, 2... Deflector roll, 3... Temper rolling mill, 4... Deflector roll,
5...Work roll, 6...Backup role,
7...Brush roll, 8...Brush roll, 9...
・Duct, 10...Blower 11...Duc 1・Hood, 12...Link tR side, 1
3...Power cylinder, 14...Dolly, 15...
- Frame, 16...motor for movement.

[Brief explanation of drawings]

Claims (4)

[Claims] (1) In a temper rolling mill, a brush roll is provided that contacts the work roll and backup roll of the temper rolling mill and rotates in the opposite direction to the rolls, and an exhaust duct is provided near the brush roll. A temper rolling mill characterized by: (2) In a temper rolling mill, a brush roll is provided that contacts the work roll and backup roll of the temper rolling mill and rotates in the opposite direction to the rolls, and an exhaust duct is provided close to the brush roll. A temper rolling mill comprising a reciprocating mechanism attached to the duct and the brush roll. (3) A brush roll is provided that contacts the work roll and backup roll of temper rolling and rotates in the opposite direction to the roll, and an exhaust duct is provided close to the brush roll, and this duct and the work roll, A temper rolling method characterized by setting a suction flow velocity between a backup roll and a brush roll to 5 m/sec or more. (4) A brush roll is provided that contacts the work roll and backup roll of temper rolling and rotates in the opposite direction to the roll, and an exhaust duct is provided close to the brush roll, and the duct and brush roll are provided with an exhaust duct. A forward and backward movement mechanism is installed, and the forward and backward movement mechanisms are moved individually or simultaneously to adjust the polishing and exhaust suction flow rate during temper rolling work, to move backward when temper rolling work is stopped, and to move backward and forward when changing rolls. A temper rolling method characterized by: