JPH0247281B2 - - Google Patents

Description

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

[Conventional technology]

As shown in FIG. 6, winding and unwinding machines 3 and 4 are arranged before and after the reversing rolling mill 1, and the electric motors of the work rolls 2 and 2 and the motors of the winding and unwinding machines 3 and 4 are installed for each pass. In the method of rolling metal by reversing the
In order to smoothly attach and detach the material coil or product coil to and from the reel mandrel of the winder and unwinder, the winder and unwinder 3 and 4 are equipped with several coil winding sections 5 as shown in FIG. The inner surface of the segment 6 and the mandrel shaft 7 are formed into a serrated shape and combined, and a hydraulic cylinder 8 is provided at the rear end of the mandrel shaft 7, and the extension operation of the hydraulic cylinder 8 winds the coil. An expanding/contracting mandrel having a structure in which the attached part 5 can be expanded or contracted as appropriate is used, and as shown in FIGS. 7 and 8, the mandrel shaft 7 advances and the metal strip plate 9 is wound with the coil winding part 5 expanded. When the winding operation is performed by applying a large winding tension to perform winding and unwinding operations, as shown in FIG. The waist is bent (reel mark),
This reel mark 11 occurs in about 10 turns in a normal plate thickness, and up to several 10 turns in the case of a thin plate, resulting in a deterioration in the quality of the product and a drawback that the yield is extremely poor.

In addition, when the metal strip is directly wound onto the expansion mandrel to perform the winding operation for rolling as described above, generally speaking, the greater the tension per unit area applied to the metal strip, the more Also, the more oil is attached to the surface of the metal strip, the greater the tightening force (the force that acts toward the inside of the coil to shrink the coil) is applied, so the segment 6
The bending force applied to the non-contact part 12 (see Fig. 7) between the mandrel shaft 7 and the mandrel shaft 7 will cause the segment 6 to warp, and in extreme cases there is a risk that the segment 6 will be damaged. A large hydraulic cylinder is required to maintain the coil inner diameter at a predetermined size.

On the other hand, adding as much tension as possible to the metal strip requires less rolling load and produces a product with a good shape. Also, if the work rolls have the same diameter, adding as much tension as possible is better than adding less tension. It is generally known that thin products can be rolled, and therefore, as shown in FIG. A method has been proposed in which a winding operation is carried out at high tension using a tube mandrel to eliminate the above-mentioned drawbacks when using an expanding and contracting mandrel, and to roll a product with a good shape. However, in this method, the rolling equipment becomes large-scale and the equipment becomes bulky.
Rewinding machine 1 equipped with a mandrel for expanding and contracting material coils
6 to the solid mandrel of the take-up and unwind machine 14 on the entry side, and the product coil is wound up from the solid mandrel of the take-up and unwind machine 15 on the exit side by the unwind machine 17 equipped with an expansion/contraction mandrel. It requires a lot of work and is not efficient, and since there are many driving sources, it consumes a lot of energy and the product cost is high. In the figure, 18 indicates a coil car.

In order to compensate for this drawback, as shown in FIG. 11, a method has been considered in which the product coil is wound in the final stage of rolling by the winding and unwinding machine 19 that unwinds the material coil at the start of rolling. However, unless the product coil is taken out, preparations for the next rolling cannot be made, and the problem of inefficiency remains unresolved.

In order to solve the above-mentioned problems with the rolling method, there is a method in which winding is performed using a mandrel fitted with a sleeve, and the product coil is taken out together with the sleeve when rolling is completed. In addition to increasing product costs because the sleeve must be prepared, work efficiency is poor because the sleeve must be taken out and transported to the next process, such as a shear line, and when the coil is annealed in the next process, the sleeve is also annealed. There are disadvantages such as severe wear and tear on the sleeve.

[Problem that the invention seeks to solve]

The present invention solves the above-mentioned problems and does not cause reel marks or damage to the mandrel even when rolling with strong tension applied, and allows for efficient and smooth rolling preparation work and product coil take-out work. This was done in order to provide a rolling method that is possible.

[Means for solving problems]

A take-up and rewinder is constructed in which two expansion and contraction mandrels each having a coil winding part that expands and contracts are arranged on a rotatable frame so that their positions can be exchanged with each other, and one of the expansion and contraction mandrels is fixed by fitting a sleeve into the expansion and contraction mandrel. disposed at the front and rear of the rolling mill, and rotating the frames of the two take-up and unwinders to move the expansion and contraction mandrels on the sleeve fitting side of both the take-up and unwinders to rolling positions, respectively;
After unwinding the coil from the expansion mandrel on the non-sleeve side of one take-up and unwinding machine and passing the tip of the metal strip between the work rolls of the rolling mill, the coil is unwound from the expansion mandrel on the sleeve installation side of the other take-up and unwind machine. When the end of the metal strip separates from the expansion mandrel on the non-sleeve side by winding the coil with the expansion mandrel on the sleeve-fitting side, the end of the metal strip is moved to the sleeve-fitting side of one winding/unwinding machine. Wind it onto an expanding mandrel.
Thereafter, the rolling mill work rolls and the expansion and contraction mandrels on the sleeve fitting side of both winding and unwinding machines are reversed every pass, and the metal strip is alternately wound up by the expansion and contraction mandrels on the sleeve fitting side of both winding and unwinding machines. The metal strip is unwound and rolled between work rolls the required number of times, and then the metal strip is wound around the expansion mandrel on the non-sleeve side of one of the winding and unwinding machines. If the loading side expansion mandrel becomes worn,
Refit the sleeve to the expansion mandrel and rotate the frame, use the expansion mandrel on which the sleeve was previously fitted as the expansion mandrel on the non-sleeved side, and fit the worn expansion mandrel with the sleeve. It is characterized by being used as a side expansion/contraction mandrel.

[Effect]

In the present invention, the metal strip is reverse rolled a required number of times while applying strong tension to the expansion mandrel on the side where the sleeve is inserted before and after the rolling mill, and at least in the final pass, the metal strip is rolled on the expansion mandrel on the side where the sleeve is not inserted. Wind it directly, applying tension to the extent that no reel marks are left on the metal strip. Since rolling is performed while applying strong tension in this way, the rolling load is reduced, and there is no reel mark on the metal strip or damage to the mandrel during rolling, and it is also easier to prepare for rolling and take out the product coil. Since the work is performed using the expansion/contraction mandrel on the side where the sleeve is not fitted, these works can be performed efficiently and smoothly, and furthermore, the work can be simplified since there is no need to remove the sleeve midway through. Furthermore, if the expansion mandrel on the non-sleeved side becomes worn as a result of long-term use, the sleeve can be refitted to the expansion mandrel, and the expansion mandrel that was previously fitted with a sleeve can be replaced with a non-sleeved expansion mandrel. It is also possible to use the expansion mandrel on the insertion side and use the expansion mandrel on the worn side as the expansion mandrel on the sleeve insertion side.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the present invention, in which two expanding and contracting mandrels 1 each having a coil winding portion that expands and contracts.
Rotary winding and unwinding machines 22 and 2 are arranged in parallel on a rotating frame 21 so that their positions can be exchanged with each other.
3 are arranged before and after the reversing rolling mill 1. As shown in FIGS. 2 and 3, the front (entering side) take-up and unwind machine 22 aligns the two expansion and contraction mandrels 19 and 20 on a rotating frame 21 rotatably supported by support rollers 24. By rotating the rotary frame 21 by 180 degrees by appropriate means, the expanding and contracting mandrels 19 and 20 can be alternately moved to the rolling preparation position A and the rolling position B. Drive shaft 25, 2 of the expansion/contraction mandrel of the take-up and unwinder on the entry side
6 is a reducer 28 output shaft 29 on the side of the electric motor 27 dedicated for rolling preparation at the rolling preparation position B, and an output shaft 3 of the reducer 31 on the main motor 30 side at the rolling position B.
2 and connected via clutches 33 and 34, respectively, to a main motor 30 and a motor 27 dedicated to rolling preparation.
This is a structure in which the expansion/contraction mandrels 19 and 20 are driven by. Reference numeral 35 denotes a hydraulic cylinder provided on the rotating frame 21 to operate the clutches 33 and 34. When the rotating frame 21 is rotated, the hydraulic cylinder 35 is actuated to operate the mandrel drive shaft 25,
26 to the side opposite to the motor, and clutches 33 and 34.
Switch to disconnected state.

The rear (output side) winding and unwinding machine 23 has approximately the same structure as the front winding and unwinding machine 22, and the expansion and contraction mandrel 1
The drive shafts 9 and 20 are connected via clutches to the output shaft of a motor-side reducer dedicated to taking out the product coil at the product coil take-out position D, and to the output shaft of the main motor-side reducer at the rolling position C, respectively.
The structure is such that the expansion and contraction mandrels 19 and 20 are driven by a main motor and a motor dedicated to taking out product coils.

In the figure, 36 is a coil car that supplies coils to the expansion mandrel at the rolling preparation position A, 37 is a coil car that receives and carries the product coil from the expansion mandrel at the product coil take-out position D, and 38 and 39 are expansion mandrels at the rolling machine positions B and C. The belt wrapper for wrapping the metal strip 9 around the belt is shown.

Entry side and exit side winding and unwinding machines 22, 2 having the above configuration
The sleeve 40 is fitted into one of the expansion and contraction mandrels (for example, 19) in 3 and fixed, and the two expansion and contraction mandrels 19 on the sleeve fitting side are
are moved to the rolling positions B and C, respectively, and the two expansion/contraction mandrels 20 on the non-sleeved side are moved to the rolling preparation position A and the product coil take-out position D, respectively, and rolling is performed in the following manner.

The metal strip 9 of the raw material coil inserted into the expansion/contraction mandrel 20 of the take-up and unwinder 22 on the entry side is fed out, and its tip is passed between the work rolls 2 of the reversing rolling mill 1 to be rolled on the exit side. After winding the sleeve 40 of the take-up and unwind machine 23 using the belt wrapper 39, the sleeve 40 is wound at high tension by the winding operation of the sleeve fitting side expansion/contraction mandrel 19 in the take-up and unwind machine 23 on the exit side. Drive the work rolls 2, 2 to
Start rolling the stage. When the rolling of the first stage progresses and the tail end of the metal strip 9 separates from the entry-side expansion/contraction mandrel 20, the winding operation is temporarily stopped and the tail end of the metal strip 9 is moved to the entry-side winding/unwinding machine 22. The belt trapper 38 is used to wrap the sleeve 40 around the metal strip 9, and the work roll is then applied to the metal strip 9 again by applying high tension to it by the winding operation of the sleeve fitting side expansion/contraction mandrel 19 of the take-up and unwinder 22 on the exit side. 2 and 2 are reversed to perform second stage rolling.

Thereafter, the work rolls 2, 2 and the take-up and unwinders 22, 23 on the inlet and outlet sides are reversed for each pass, and rolling is repeated for at least the passes other than the last pass, thereby rolling the passes before the final pass. Once this is completed, the winding operation is temporarily stopped. When the final pass corresponds to an odd number of times, since the metal strip 9 has already been wound by the take-up and unwinder 22 on the entry side when the previous stage of rolling is completed, the tip of the metal strip 9 is rolled up on the exit side. After separating it from the sleeve 40 of the take-up and rewind machine 23, it is directly wound around the expansion/contraction mandrel 20 on the non-sleeved side of the take-up and rewind machine 23 on the exit side, so that no reel mark is left on the metal strip 9, and The final stage of rolling is performed at a tension that does not crush the inner diameter of the coil when the product coil is removed from the expansion/contraction mandrel and does not damage the segments of the expansion/contraction mandrel. The product coil wound onto the expansion/contraction mandrel 20 of the winding/unwinding machine 23 on the exit side during the final stage of rolling is caused by the contraction operation of the segments 6 accompanying the backward movement of the mandrel shaft 7 of the expansion mandrel. Then, it is taken out from the expansion/contraction mandrel and conveyed by the coil car 37 that has been waiting. In this way, in the present invention, since the sleeve is fitted to the expansion mandrel, there is no reel mark on the metal strip and there is no risk of damaging the segments, so rolling can be performed at high tension, and the sleeve is fitted. Since the final pass of winding is performed using a non-expanding mandrel, the work of removing the product coil is simple and efficient. Further, since there is no need to attach or detach the sleeve in the middle, the work is easy. Furthermore, if the expansion mandrel on the non-sleeved side becomes worn as a result of long-term use, the sleeve can be refitted to the expansion mandrel, and the expansion mandrel that was previously fitted with a sleeve can be replaced with a sleeve. It is convenient because it can be used as the expansion mandrel on the non-fitting side, and the worn expansion mandrel can be used as the expansion mandrel on the sleeve fitting side. Furthermore, when a belt wrapper is used for the work of winding the metal strip, it is economical because it is sufficient to provide one belt wrapper on each of the entry and exit sides.

In addition, in the present invention, at least in the pass before the final pass, the coil must be changed from the expansion mandrel on the sleeve-fitting side to the expansion-contraction mandrel on the non-sleeve side, which reduces work efficiency to some extent. However, this work of changing the coil end only needs to be done once at least once the previous pass of the final pass is completed among the multiple passes.
In addition, when using a reversing rolling mill, it is inevitable that there will be more or less unrolled parts at the front and rear ends of the metal strip, that is, parts that will not become a product, so if you cut them off at this time, you will save the trouble of cutting them in the next process. There are no problems whatsoever. The cutting operation of the front and rear ends of the metal strip may be performed by a shear built into the rolling mill, or may be performed by a portable shear. The cut scraps may be removed together with the sleeve or separately.

4 and 5 show another configuration of the take-up and rewind machine used in the present invention, in which teeth 41 formed on the outer periphery mesh with a gear 42 and are rotated in the horizontal direction by the drive of the gear 42. An expansion/contraction mandrel 19 fitted with a sleeve 40 and an expansion/contraction mandrel 20 without a sleeve fitted are arranged side by side in opposite directions on a moving horizontal rotating frame 43, and each mandrel is positioned at a required position for winding and unwinding. When this happens, the output shaft 45 of the electric motor 44 and each mandrel drive shaft 23, 26 can be connected via clutches 46, 47.
In the figure, reference numeral 48 denotes a hydraulic cylinder that operates the clutches 46 and 47 by moving the clutch piece on the output shaft 45 side forward and backward by rotating the lever 50 about the fulcrum 49.

Even if a horizontal rotary take-up and unwinder having such a configuration is used, the same effects as described above can be achieved.

The rolling method of the present invention is not limited to the above-described embodiments; the sleeve may be fitted onto the expansion/contraction mandrel on either side, and various other modifications may be made without departing from the gist of the present invention. Of course, it is possible to do so.

〔Effect of the invention〕

According to the rolling method of the present invention, (i) Products without reel marks can be rolled.

(ii) Mandrel damage due to strong tension is eliminated.

(iii) does not require large expansion and contraction cylinders to counter strong tensions;

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

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

(vi) Compared to the conventional sleeve-based method,
The number of sleeves can be reduced and there is less damage to the sleeves.

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

(viii) Since expansion mandrels on the non-sleeved side are provided on both sides of the rolled material, preparation work for the next rolling can be carried out during rolling, and work to take out the product coil can be carried out smoothly.

(ix) Even if the expansion mandrel on the non-sleeved side becomes worn out as a result of long-term use, it is convenient because the expansion mandrel can be easily replaced by refitting the sleeve and rotating the frame. This greatly helps extend the life of the winding and rewinding device.

It has excellent effects such as

[Brief explanation of the drawing]

Fig. 1 is a front view of rolling equipment used to implement the rolling method of the present invention, Fig. 2 is a front view of a take-up and unwinder used in the rolling method of the present invention, and Fig. 3 is a plan view of the same. , FIG. 4 is a plan view of another embodiment of the winding and unwinding machine used in the rolling method of the present invention, FIG. 5 is a view taken along the line V-V in FIG. 4, and FIG. 6 is a reverse rolling equipment. 7 is a longitudinal cross-sectional view of the expansion/contraction mandrel used in the winding and unwinding machine, FIG. 8 is a view taken in the direction of the arrow in FIG. 7, FIG. 9 is an enlarged view of a portion of FIG. 8, and FIG. 10 and 11th
The figure is an overall view of a reversing type rolling facility in which the winding and unwinding machine is equipped with a solid mandrel. 1 is a reverse rolling mill, 2 is a work roll, 9 is a metal strip, 19 and 20 are expansion and contraction mandrels, 21 and 43
is a rotating frame, 22 and 23 are rotary winders, 36 and 37 are coil cars, 40 is a sleeve,
A indicates the rolling preparation position, B and C indicate the rolling position, and D indicates the product coil take-out position.

Claims (1)

[Claims] 1. A winding and rewinding machine in which two expansion and contraction mandrels each having a coil winding part that expands and contracts are arranged on a rotatable frame so that their positions can be exchanged with each other, and one expansion and contraction mandrel is fixed by fitting a sleeve into the expansion and contraction mandrel. are placed at the front and rear of the rolling mill, and by rotating the frames of both take-up and unwinders, the expansion mandrels on the sleeve fitting side of both take-up and unwinders are moved to the rolling position, and one of the take-up and unwinders is moved to the rolling position. After unwinding the coil from the expansion mandrel on the side where the sleeve is not fitted in the unwinding machine and passing the tip of the metal strip between the work rolls of the rolling mill, it is guided to the expansion and contraction mandrel on the side where the sleeve is fitted in the other winding and unwinding machine. When the end of the metal strip is separated from the expansion mandrel on the non-sleeve side by winding the coil with the expansion mandrel on the sleeve fitting side, the end of the metal strip is wound around the expansion mandrel on the sleeve fitting side of one winder and unwinder. Thereafter, the rolling mill work rolls and the expansion and contraction mandrels on the sleeve fitting side of both take-up and unwinding machines are reversed every pass, and the metal strip is alternately wound by the expansion and contraction mandrels on the sleeve fitting side of both take-up and unwinding machines. The metal strip is unwound and rolled between work rolls the required number of times, and then the metal strip is wound around the expansion mandrel on the non-sleeve side of one of the winding and unwinding machines. When the expansion mandrel on the side to which the sleeve is worn is worn out, the sleeve is refitted to the expansion mandrel, the frame is rotated, and the expansion mandrel to which the sleeve was previously fitted is used as the expansion mandrel on the non-sleeved side. A rolling method characterized in that the expansion mandrel on the worn side is used as the expansion mandrel on the sleeve fitting side.