JPS60145205A - Rolling method - Google Patents

Abstract

PURPOSE:To improve the efficiency of the operations for preparing a rolling of strip and taking out a product coil by reversing work rolls at every pass for rolling the strip while applying a heavy tension to the metallic strip by the expanding and contracting mandrels located at the sleeve-inserting sides of the front and back of a rolling mill. CONSTITUTION:Winding and unwinding machines 22, 23 are arranged at the front and the back of a mill 1. The machines 22, 23 are respectively provided with plural expanding and contracting mandrels 19, 20 having each an expanding and contracting coil-winging part, and a sleeve 40 is fitted and fixed to at least one mandrel 19. Then, a metallic strip 9 is rolled between the work rolls of mill 1 by reversing the work rolls at ever pass and alternately winding and unwinding the strip 9 by the mandrels 19 located each at the inserting side of a sleeve 40. The strip 9 is thereafter wound and unwound by either of the mandrels 19, 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method (1) for rolling metal by reversing the work rolls of a rolling mill every pass.

[Conventional technology]

As shown in FIG.
) (2) The electric motors are arranged in the same winding and unwinding machine (31 (method of rolling metal by reversing the electric motor in 41 (=), the reel mandrel C of the winding and unwinding machine: the material coil or product for which it is to be rolled) Coil installation and removal work is smooth (one step is required,
As shown in FIG. 7, the winding and unwinding machine (3) (4) C2 has a coil winding part (5) composed of several segments (6), and the inner surface of the segment (6) and Mandrel shaft (
7) are combined in a serrated shape (two), and the rear end of the mandrel shaft (7) is provided with two hydraulic cylinders (81) to extend the hydraulic cylinder (8) (two twisted coil winding portions (5)). An expanding/contracting mandrel is used, which has a structure that allows the C-ni mandrel shaft (7) to move forward and expand the coil winding part (5) as shown in Figure 7.8. ) in order to perform winding and unwinding operations by applying a large winding tension, as shown in FIG. =located metal strip (9
) C2 has a bend (reel mark), and the reel mark αυ is about 10 turns for normal plate thickness, and several tens for thin plate.
Since this occurs up to the level of curling, the quality of the product deteriorates and there are disadvantages in that small drips become very bad.

In addition, as mentioned above, when winding a metal strip directly onto an expanding mandrel (=directly) and performing a winding operation for rolling, it is necessary to The larger the coil is, and the more oil adheres to the surface of the metal strip, the greater the tightening force (the force that acts in the inside of the coil and tries to shrink the coil) will be applied. ) and the mandrel shaft (7) (see Figure 7) (= applied bending force (
Segment (6) may warp due to the bending force, and in extreme cases, there is a risk of damaging the segment (6). is necessary.

On the other hand, if the metal strip (-) is applied as much tension as possible, the rolling load will be less and the product will have a better shape.Also, if the work roll is the same diameter, it will be thicker than if there is less tension. It is generally known that a thinner product can be rolled using a multi-stage rolling mill (take-up and unwind machine Q4 equipped with a solid mandrel before and after 13) (151 A method has been considered in which the above-mentioned drawbacks of using an expanding mandrel are removed by rolling a product with a good shape by installing a solid mandrel and performing a winding operation at a higher tension than the second solid mandrel. However, such a method (In the second case, the rolling equipment becomes large-scale and bulky, and the work of winding the solid mandrel C of the entry side winding unwinding machine (14) from the unwinding mQe equipped with the expanding/contracting mandrel of the material coil) (
It is necessary to wind the second product coil from the solid mandrel of the winding and unwinding machine a9 on the output side using the winding machine (I'I) equipped with an expanding and contracting mandrel, which is not efficient and requires many driving sources. Therefore, there are disadvantages such as high energy consumption and high product cost. In the figure (one barrel indicates a coil car).

In order to compensate for this drawback, as shown in FIG. has also been considered, but the problem of inefficiency remains unsolved, as preparations for the next rolling cannot be made unless the product coil is taken out.

In order to solve the above-mentioned problems with the rolling method, we developed a mandrel fitted with a sleeve (double winding).
There is also a method of taking out the product coils along with the sleeves when rolling is complete, but this increases the product cost because it is necessary to prepare as many sleeves as there are product coils, and in addition, the sleeves have to be taken out and transported in the next process, such as a shearing line. This causes problems such as poor work efficiency, and when the coil is annealed in the next step, the sleeve is also annealed, resulting in severe wear and tear on the sleeve.

[Problem that the invention seeks to solve]

The present invention solves the above problems and allows rolling preparation work and product coil takeout work to be carried out efficiently and smoothly without forming reel marks or damaging the mandrel even when rolling is performed while applying strong tension. In order to provide a rolling method that allows for

[Means for solving problems]

The present invention comprises a plurality of expansion and contraction mandrels each having a coil winding portion that expands and contracts, and at least one expansion and contraction mandrel (2 sleeves are fitted into and fixed to the front and back of a rolling mill such as a winding and unwinding machine).
The work rolls of the rolling mill are reversed every pass, and the expansion mandrel on the sleeve fitting side of both winding and unwinding machines (the metal strip is alternately wound and unwound between the work rolls). The material is rolled the required number of times, and then the metal strip is wound on the expanding and contracting mandrel on the non-sleeve side of one of the winding and unwinding machines.

[For production]

In the present invention, the metal strip (C) is reverse rolled a required number of times while applying strong tension to the expansion mandrels on the sleeve-fitting side before and after the rolling mill. The plate is directly wrapped around the metal strip, applying tension to the extent that no reel marks are left on the metal strip.In this way, rolling is performed while applying a strong tension, so the rolling load is reduced.
Moreover, during rolling (-metal strip C), there will be no reel marks or damage to the mandrel, and rolling preparation work and product coil take-out work are performed from the expansion and contraction mandrel on the side where the sleeve is not fitted (2). The work can be done efficiently and smoothly, and the work can be simplified since there is no need to remove the sleeve during the process.

〔Example〕

Examples of the present invention will be described below with reference to the oral surface.

FIG. 1 shows the present invention, and shows two expanding and contracting mandrels (1!1 (201
are installed side by side on a rotating frame (1) so that they can be exchanged in two positions. The front (entering side) take-up and unwinder C1!4 has a rotary frame (211) rotatably supported by support rollers (21) as shown in Figures 2 and 3 (2). Mandrel Q!1 (20
1 are arranged in parallel, and the rotating frame (211 is rotated 180° by an appropriate means.)
(20) can be alternately moved between the rolling preparation position (Al) and the rolling position (B). At the preparation position (A) c, the reducer (281 output shaft I29) on the side of the electric motor 07 dedicated to rolling preparation, and at the rolling position (B) the reducer Gυ output shaft (3) on the side of the main electric fi (301),
They are connected via clutches C33 (341), and the expansion and contraction mandrel (Lyu (2) is driven by the main motor (to) and the electric motor for rolling preparation @C2. When rotating the rotating frame (21+), the hydraulic cylinder 0ω is actuated to move the mandrel drive shaft I251 (261) to the side opposite to the electric motor, and the clutch 03 Switch the (goods) to the disconnected state.

The rear (output side) winding and unwinding machine (231) has almost the same structure as the front winding and unwinding machine. At the rolling position (C), the output shaft of the motor-side reducer dedicated to taking out product coils is connected to the output shaft of the main motor-side reducer at the rolling position (C), respectively, through clutches. Expansion mandrel (l special (2Q) by mi2
This is the structure that drives the

The rolling preparation position (06) in the figure is the coil car that supplies the Al expansion/contraction mandrel drive shaft, and the 0ηC product coil take-out position (the indenter coil car that receives and carries the product coil from the Dl expansion/contraction mandrel, c381C39) is the rolling preparation position (~ 2 shows a belt wrapper around which an expanding mandrel (two metal strips (9)) is wound.

Inlet and outlet winding and rewinding machines with the above configuration C! 31
) and fix the sleeve (40), the two expansion mandrels a9 on the side where the sleeve is fitted are at the rolling position Q-2, and the two expansion mandrels on the side where the sleeve is not fitted are at the rolling position. Next, move the rolling preparation position (AI and product coil take-out position) twice, and then perform rolling in the following manner.

The expansion/contraction mandrel (to) (2) of the winding and unwinding machine on the entry side (2) The metal strip (9) of the inserted material coil is let out, and its tip is passed through the work roll (21 (21)) of all the reverse rolling mills (1). 2)
Interval 1 - Take-up and unwinder (23 sleeves (4)
(It = After winding using the belt wrapper C3! While rolling, drive the work roll +21 (2) to start the first stage rolling.When the first stage rolling progresses and the tail end of the metal strip (9) moves away from the expansion mandrel (4) on the input side. The winding operation is temporarily stopped, and the tail end of the metal strip (9) is wrapped using the sleeve (4υ) of the winding and unwinding ma21 on the inlet side (=belt wrapper), and then Winding operation of the expansion/contraction mandrel cI9 on the sleeve fitting side of the winding and unwinding machine (4) (while applying high tension to the metal strip (9) again from the second stage, the work roll (2) (21 is reversed and the second stage Perform rolling.

Thereafter, for each pass (second work rolls (2) (2), the inlet and outlet take-up and unwinders (221+231) are reversed, and rolling is repeated for at least the other passes except the final pass. Once the previous stage pass is completed, the winding operation is temporarily stopped.Then, the final pass is performed an odd number of times (= if applicable, the metal strip (9) is rolled when the previous stage is completed. 12211=, so after pulling the tip of the metal strip (9) away from the sleeve (4υ) of the take-up and unwinder on the exit side ( 2
Direct winding of the expansion mandrel σ on the non-fitting side of the sleeve in step 3, the metal strip (9) (= no reel mark, and the inner diameter of the coil will not be crushed when removed from the expansion mandrel, which is a product coil, and the expansion mandrel The final stage of rolling is carried out with a tension ζ that does not damage the segment. The retreating operation of the mandrel shaft (7) (2) The accompanying contraction operation (2) of the segment (6) (=Therefore, the coil car 〇η (2) which was taken out from the expansion/contraction mandrel and was on standby. In the invention (=), since the expansion mandrel is equipped with a sleeve fitting device, there is no reel mark on the metal strip and there is no risk of damaging the segments, so rolling can be carried out at high tension. The expansion/contraction mandrel without mounting (as the winding is performed in the second and final pass, the work of removing the product coil is simple and efficient. Also, there is no need to attach or detach the sleeve midway, so the work is simple). In C-, if the expansion mandrel on the non-sleeved side becomes worn after long-term use (for two years), the sleeve should be refitted to the expansion mandrel, and the sleeve was fitted until now. It is convenient because the expansion mandrel can be used as the expansion mandrel on the side where the sleeve is not fitted, and the expansion mandrel on the worn side can be used as the expansion mandrel on the side with the sleeve. When in use, one belt wrapper is needed for each person on the entry and exit sides (two people), which is economical.

In addition, in the present invention (2), the L-L coil must be re-wound from the expansion mandrel on the sleeve fitting side to the expansion mandrel on the non-sleeve installation side at least in the pass before the final pass. (Secondly, this work of changing the attachment of the coil end only needs to be done once at the end of at least the previous pass of the final pass among the multiple passes, and the reverse rolling process (In the second case, it is inevitable that some parts of the front and rear ends of the metal strip (= parts that are not rolled, that is, will not become a product, will remain to some extent,
If you cut it out at this time, you can save the trouble of cutting it out in the next process, and there is no similar problem. The work of cutting off the front and rear ends of the metal strip can be done using a rolling mill (2) or a shear (2) installed in a rolling machine, or a boat pull shear (C2). It may be taken out separately, or it may be taken out separately.

Figure 4.5 shows another configuration of the winding and rewinding machine used in the present invention, in which the outer periphery (= formed teeth A horizontal rotating frame (43c) which rotates twice in direction C (expansion mandrel (19) fitted with sleeve (4G) and expansion mandrel (A) without sleeve fitted are arranged side by side facing in opposite directions to each other for winding and unwinding. Required position width - When each mandrel is positioned (output shaft of two electric motors (44) - (4 clauses and each mandrel drive shaft CI! 51 (261) can be connected via clutch (A) (4η) , In the figure (4 is the output shaft (451 side clutch piece is the fulcrum) (the lever (5th rotation) centering on the 491 side clutch (41
(47) is a hydraulic cylinder that operates.

Even when using a horizontal rotary winder and unwinder with this configuration,
The same effects as described above can be achieved.

The rolling method of the present invention is not limited to the above-mentioned embodiments. The sleeve may be attached to either side of the expansion/contraction mandrel (two may be fitted, and other various modifications may be made without departing from the gist of the vehicle invention. With the following changes: 1) It is now possible to roll products without reel marks.

11) Strong tension (no damage to the mandrel due to double tension).

111) Strong tension (no need for large expansion/contraction cylinders to counteract two).

iv) Since rolling can be performed while applying strong tension, the rolling load is reduced and products with good shapes can be rolled.If the work roll diameter is the same, thinner products and harder materials can be rolled at C2. .

■) Compared to methods using solid mandrels, equipment costs are lower, work efficiency is better, and energy consumption is lower.

vl) Compared to the conventional method using sleeves, the number of sleeves can be reduced and there is less damage to the sleeves.

viD There is no need to remove the sleeve during the process, which simplifies the work, making it safe and efficient.

viii) Since the expansion and contraction mandrels on the non-sleeved side are provided on both sides (2) of rolling, it is possible to perform preparation work for the secondary rolling during rolling (2). can.

It has excellent effects such as

[Brief explanation of drawings]

Fig. 1 is a front view of the rolling equipment used to implement the rolling method of the present invention, Fig. 2 is a front view of the winding and unwinding machine used in the rolling method of the present invention, and Fig. 3 is the same plane. 4 is a plan view of another embodiment of the take-up and unwinder used in the rolling method of the present invention, FIG. 5 is a view taken along the V-■ arrow in FIG. 4, and FIG. An overall view of the equipment, Figure 7 is a vertical cross-sectional view of the expansion and contraction mandrel used in the winding and unwinding machine, Figure 8 is a view taken in the direction of the ■ arrow in Figure 7,
Fig. 9 is an enlarged view of the part ■ in Fig. 8, and Figs. 10 and 11 are general views of the reversing rolling equipment when it is equipped with a take-up and unwinder (=solid mandrel). (1 ) is a reversing rolling mill, (2) is a work roll, (9) is a metal strip, (L9■ is an expansion mandrel, (211 (43
1 is a rotating frame, @(c) is a rotary winding and unwinding machine, ma
y+ is the coil car, (40 is the sleeve, (N is the rolling preparation position, (Bl (C1 is the rolling position, and (D) is the product coil take-out position T.

Claims (1)

[Claims] 1) Winding and unwinding machines each having a plurality of expansion and contraction mandrels each having a coil winding part that expands and contracts and in which at least one expansion and contraction mandrel C sleeve is fitted and fixed are arranged at the front and rear of the rolling mill, and the rolling machine work rolls are Expanding/contracting mandrel C on the sleeve fitting side of both winding and unwinding machines that reverses C twice every bus: The metal strip is alternately wound and unwound, and the metal strip is rolled between the work rolls the required number of times. A rolling method characterized in that the sleeve-unfitting side of one of the winding and unwinding machines is wound and wound with the expanding and contracting mandrel hook-joint strip.