JPH04108909U - Indentation flaw prevention device during temper rolling - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent indentation defects during temper rolling. [Structure] The indentation flaw prevention device is provided on the anti-cross brake roll 3b and the deflector roll 4b provided on the exit side of the temper rolling mill 10, with respect to the vertical plane with respect to the anti-cross brake roll 3b. The deflector roll 4b is provided with a nozzle 31 that injects gas at an inclination angle θ ₁ of 30 degrees or less and facing the roll rotation direction.
The structure is such that a nozzle 41 for injecting gas is provided facing the roll rotation direction at an inclination angle θ ₂ of 60 degrees or less with respect to the vertical plane.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a device for preventing indentation defects that occur during temper rolling. .

0002

[Conventional technology]

Conventionally, the causes of indentation flaws during temper rolling are as follows.

0003 (1) Foreign matter and dirt brought in from the steel strip (2) Dirt and foreign matter falling inside the rolling mill (3) Roll wear (4) Foreign matter in rolling oil No countermeasures are currently being taken for the cause of (1) above. Cause of (4) above This can be achieved by making the rolling oil non-circulating or by improving the filter system. It will be resolved.

0004 Conventionally, various countermeasures have been taken against the causes (2) and (3) above. A device (special equipment) that sprays rolling oil from a rolling oil nozzle onto the work rolls of a rolling mill to clean them. Publication No. 61-200606), or backup role or work row A cleaning device has been proposed in which a brush roll is pressed against a brush roll.

[0005] However, with these devices, foreign matter and dirt that could not be sufficiently removed in the rolling mill are removed by the subsequent roller. Remove any dirt that may have adhered to the roll or dirt that may have come from outside. This resulted in indentation defects on the product.

[0006] In a general temper rolling mill, as shown in Fig. 1, work roll 1, back It is made up of up roll 2. Clip pins are installed on the entry and exit sides of the temper rolling mill 10. brake roll 3a, anti-cross brake roll 3b, deflector roll 4a , 4b, and bridle rolls 5a, 5b, respectively.

[0007] Tension rolls 3a, 3b and deflector rolls 4a, 4b are replaced. The cycle is long, and clipping roll 3a, anti-cross brake roll 3b is located below the steel strip 6, making it difficult to clean. Also, the deflector There is no space near the rolls 4a and 4b, making cleaning difficult.

[0008] In the past, quality awareness on the part of consumers was not so strict, so clipping rollers roll 3a, anti-cross brake roll 3b, deflector roll 4a, 4b. Cleaning wasn't much of a problem.

[0009]

[Problem that the idea aims to solve]

The problem that this invention aims to solve is the need for tension rolls and deflation during temper rolling. The objective is to prevent indentation scratches caused by the cutter roll.

0010

[Means to solve the problem]

The device for preventing indentation flaws during skin pass rolling of the present invention is installed on the exit side of the skin pass rolling mill. In anti-cross brake rolls and deflector rolls, For loss brake rolls, roll at an angle of inclination of 30 degrees or less relative to the vertical plane. A nozzle is provided that injects gas in opposition to the direction of rotation, and Then, the gas is directed opposite the direction of roll rotation at an angle of inclination of 60 degrees or less to the vertical plane. The above problem is solved by a means provided with a nozzle for spraying.

[0011] Another nozzle may also be provided adjacent to each of the nozzles.

0012 A lifting mechanism is connected to a nozzle provided opposite to the deflector roll, and the nozzle It is also possible to selectively change the vertical position of the screen.

[0013]

[Effect] The device for preventing indentation flaws during skin pass rolling of the present invention prevents pressurized gas ejected from the nozzle from collision with the cross-brake roll and deflector roll, causing damage to the roll surface. Blow off any foreign objects and dirt that may have adhered to it.

[0014] The rolls on the entry side of the temper rolling mill are not cleaned. This is tempering This is because cleaning with normal rolling oil is performed on the entry and exit sides of the rolling mill.

[0015]

【Example】

Referring to Figure 1-5, an example of the device for preventing indentation flaws during skin pass rolling according to the present invention will be explained. I will explain.

[0016] As best shown in Figure 1, the skin pass rolling equipment to which the present invention is applied is equipped with a supply reel. The steel strip 6 which has been unwound from 7 is a deflector roll 4a and a bridle roll 5a. The workpiece of the temper rolling mill 10 passes through this gap and passes the clipping roll 3a. - Passes between rolls 1 and undergoes temper rolling. The steel strip 6 that has been temper rolled is It passes through the loss brake roll 3b, then deflector roll 4b and bridle roll. It passes between the winding reel 5b and the winding reel 8 and is wound up on the winding reel 8.

[0017] As shown in FIG. 1, the indentation flaw prevention device during temper rolling of the present invention prevents anti-cross brake rolls 3b and deflector rolls 4b provided on the exit side of the temper rolling mill 10. The brake roll 3b is provided with a nozzle 31 that injects gas at an inclination angle θ ₁ (FIG. 2) of 30 degrees or less with respect to the vertical plane, and is opposed to the roll rotation direction. is characterized in that a nozzle 41 that injects gas is provided facing the roll rotation direction at an inclination angle θ ₂ (FIG. 4(A)) of 60 degrees or less with respect to the vertical plane.

The gas injected from the nozzles 31 and 41 is preferably air or an inert gas. Further, the pressure of the gas is preferably about 2 kg/cm ² or more.

[0019] The nozzles 31 and 41 have a plurality of ejection ports 3 in a header 311, as illustrated in FIG. 12 may be arranged in parallel at equal intervals. Erupts when space is small It is preferable that the opening 312 be formed wide and thin.

[0020] As illustrated in FIG. 4(B), another nozzle 31 is installed adjacent to the nozzle 31. You can leave it. This also applies to the nozzle 41. At this time, one nozzle One nozzle is used to eject a jet stream of water, and the other nozzle is used to eject high-temperature gas. Accordingly, the cleaning effect can be further enhanced.

[0021] Furthermore, as shown in FIG. 4(C), a bridle roll 5b is used. In such a case, the lifting mechanism 4 is installed in the nozzle 41 provided opposite to the deflector roll 4b. 3 can be connected to each other so that the vertical position of the nozzle 41 can be selectively changed. Ru.

[0022] The present invention was applied to a cold-rolled steel strip with average dimensions of 0.86 mm thick x 1178 mm wide. Figure 5 shows the results of temper rolling carried out in the temper rolling line. The fruits of this invention It can be seen that the number of indentation flaws is significantly reduced by applying this method.

[0023]

[Effect of the idea]

According to the present invention, indentation scratches can be significantly reduced with slight equipment improvements. I can do it.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of a temper rolling mill to which the present invention is applied.

FIG. 2 is a schematic explanatory diagram showing an example of cleaning an anti-cross brake roll.

FIG. 3 is a front view taken from line III-III in FIG. 2;

FIG. 4 is an explanatory diagram of an example of cleaning various rolls.

FIG. 5 is a graph showing the effects of the present invention.

[Explanation of symbols]

1: Work role 2: Backup role 3a: Clipping roll 4a, 4b: Deflector roll 5a, 5b: Bridle roll 6: Steel strip 7: Supply reel 8: Take-up reel 10: Temper rolling mill 31, 41: Nozzle 43: Lifting mechanism

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Shinji Kanzaki Sumitomo Metal, 3 Hikari, Kashima-machi, Kashima-gun, Ibaraki Prefecture Inside the Kashima Steel Works of Betsu Kogyo Co., Ltd. (72) Creator Tokio Sato Sumitomo Metal, 3 Hikari, Kashima-machi, Kashima-gun, Ibaraki Prefecture Inside the Kashima Steel Works of Betsu Kogyo Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. In an anti-cross brake roll and a deflector roll provided on the exit side of a temper rolling mill, the anti-cross brake roll is rolled at an inclination angle of 30 degrees or less with respect to the vertical plane. The deflector is provided with nozzles that inject gas in opposite directions in the direction of rotation.
A device for preventing indentation flaws during skin pass rolling, characterized in that a nozzle is provided on the roll to inject gas at an angle of inclination of 60 degrees or less with respect to the vertical plane and facing the roll rotation direction. 2. The apparatus according to claim 1, further comprising another nozzle adjacent to each of said nozzles. 3. Claim 1, characterized in that an elevating mechanism is connected to a nozzle provided opposite to the deflector roll, so that the vertical position of the nozzle can be selectively changed.
The device described.