JPS6047002B2 - Rolling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for rolling metal by reversing the work rolls of a rolling mill every bus.

As shown in FIG. 1, 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 bus. In the method of rolling metal by reversing the winding and unwinding machines, the winding and unwinding machines 3 and 4 are equipped with a first As shown in FIG. 2, the coil winding part 13 is composed of several segments 10, and the inner surface of the segments 10 and the mandrel shaft 11 are formed in a sawtooth shape and combined, and a hydraulic cylinder is installed at the rear end of the mandrel shaft 11. 12 is provided, and the coil winding portion 13 is opened by the extension operation of the hydraulic cylinder 12.
As shown in FIGS. 2 and 3, an expanding/contracting mandrel having a structure that can expand and contract the metal strip 6 as needed is used, and as shown in FIGS.
In order to perform the winding and unwinding operation by winding the
As shown in the figure, the gap 1 between adjacent segments 10, 1
There is a seat (reel mark) on the metal strip 6 located above 4.
occurs, and this reel mark 15 is about m turns with normal plate thickness,
In the case of a thin plate, up to several tens of turns occur, resulting in a deterioration in the quality of the product and a drawback that the yield is extremely poor.

In addition, when winding a metal strip directly around an expansion mandrel to perform a winding operation for rolling as described above, generally speaking, the greater the tension per unit area applied to the metal strip, the more The more oil is attached to the surface of the metal strip, the greater the tightening force J (the force acting toward the inside of the coil that tends to shrink the coil) is applied. Due to the bending force applied to the non-contact part 16 (see Figure 2), the segment
10 will warp, and in extreme cases there is a risk of damaging the segment 1i0. In addition, a large hydraulic cylinder is required to counteract the tightening force and maintain the inner diameter of the coil at a predetermined size.

On the other hand, applying 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, applying as much tension as possible is better than applying less tension. It is generally known that thin products can be rolled, and for this reason, as shown in Figure 5,
Winding and unwinding machines 18 and 19 equipped with solid mandrels are installed before and after the multi-high rolling mill 17, and these solid mandrels perform the winding operation under high tension to eliminate the drawbacks of using the expansion and contraction mandrels described above. A method of rolling a product with a good shape is being considered.

However, in such a method, the rolling equipment becomes large-scale and equipment costs increase, and the work of winding the raw material coil from the unwinding machine 21 equipped with the expansion/contraction mandrel onto the solid mandrel of the winding unwinding machine 18 on the entry side, and It is necessary to wind the product coil from the solid mandrel of the winding and unwinding machine 19 on the output side using the winding machine 22 equipped with an expansion/contraction mandrel, which is not efficient, and because there are many driving sources, it consumes a lot of energy. There are disadvantages such as the product coil being expensive.
In the figure, 23 indicates a coil car. In order to compensate for this drawback, a method has been considered in which the product coil is wound up in the final stage of rolling by the winding and unwinding machine 24 that unwinds the material coil at the start of rolling, as shown in FIG. However, unless the product coil is taken out, preparations for the next rolling cannot be made, and the problem of inefficiency remains unresolved.

The rolling method of the present invention overcomes the above-mentioned drawbacks of the conventional method. This was done to solve the problem.A non-expandable mandrel with a coil winding part that does not expand or contract is installed before and after the reversible rolling mill, and a mandrel with a coil winding part that expands or contracts is used. After unwinding the coil and passing the tip of the coil through the rolling mill, one side is unexpanded. When the end of the coil is separated from the expansion mandrel by winding the coil with one non-expansion mandrel, the end of the coil is wound around the other non-expansion mandrel, and thereafter the coil is wound on the work roll of the rolling machine and the non-expansion mandrel. This method is characterized in that the coil is rolled a required number of times by rotating the mandrel in reverse every F bus, and then the coil is wound by an expansion and contraction mandrel different from the expansion and contraction mandrel mentioned above.

The implementation of the present invention will be explained below with reference to the drawings.

Referring to FIG. 7, on the inlet side of the reversing rolling mill 1, there is a second
As shown in the figure, there is an expansion/contraction mandrel 25 that allows the coil winding part to be expanded or contracted, and an unwinding machine 27 that feeds the raw material coil conveyed by the coil car 26 to the rolling mill and the coil winding part do not expand or contract. A take-up and unwinder 29 equipped with a solid mandrel 28 is installed on the exit side of the reversing rolling mill 1, and a solid mandrel 31 and an expansion/contraction mandrel 32 are arranged side by side on a fixed frame 30 as shown in FIG. 33, winding and rewinding machines 35 are respectively provided which can appropriately select and transmit the output of the electric motor 34. To explain in detail the power transmission mechanism of the take-up and unwind machine 35 disposed on the exit side,
Front and rear of the fixing ring 37 fixed to the output shaft 36 are a gear 40 that meshes with a gear 39 fixed to the mandrel drive shaft 38 of the solid mandrel 31 and a gear 42 that meshes with a gear 42 fixed to the mandrel drive shaft 41 of the expansion/contraction mandrel 32. 43 are each rotatably attached to the output shaft 36,
``The slide ring 44, which can rotate together with the fixed ring 37 and can slide in the axial direction, is connected to the convex part of the gear 43 or the gear 40.
The output of the electric motor 34 can be transmitted to the mandrel drive shaft 41 of the expansion/contraction mandrel 32 or the mandrel drive shaft 38 of the solid mandrel 31 by fitting with the convex portion of the mandrel.

In addition, 45 in the figure indicates the coil car on the exit side. Now, prior to rolling, the material coil is inserted into the expansion/contraction mandrel 25 of the unwinding machine 27, and the slide ring 44 is inserted into the gear 40 as shown in the figure.
The solid mandrel 31 is fitted into the convex portion of the solid mandrel 31 so that the take-up and unwinder 35 on the exit side can drive the solid mandrel 31. After that, the metal strip is let out from the raw material coil of the unwinder 27 and its tip is The sheet is passed between the work rolls 2 and 2 of the reversing rolling mill 1 and wound around the solid mandrel 31 of the take-up and unwinder 35 on the exit side using, for example, a hydraulic grip.
5, the work rolls 2, 2 are wound with high tension.
is driven to start the first stage rolling.

When the first stage of rolling progresses and the tail end of the metal strip leaves the expansion/contraction mandrel 25 of the unwinder 27, the winding operation is temporarily stopped and the tail end of the metal strip is moved to the input side and unwinded. The metal strip 6 is inserted into the grip of the solid mandrel 28 of the machine 29 and wound, and then the metal strip 6 is wound again by the winding operation of the winding and unwinding machine 29 on the entry side.
The work rolls 2, 2 are reversed while applying high tension to perform second-stage rolling. Thereafter, the work rolls 2, 2, the solid mandrels 28, 31 of the inlet and outlet take-up and unwinders 29, 35 are reversed for each bus, and at least the other buses except the last bus are rolled repeatedly. , Once the bus preceding the last bus is completed, the winding operation is temporarily stopped.

When the last bus is an odd number of times, the metal strip 6 is wound by the take-up and unwinder 2 on the entry side when the previous stage of rolling is completed, so the tip of the metal strip 6 is placed on the exit side. It is pulled away from the solid mandrel 31 of the take-up and rewind machine 35 and wound directly onto the expansion/contraction mandrel 32 of the take-up and rewind machine 35 on the output side, and the slide ring 44 is then fitted into the convex part of the gear 43 to connect the output shaft 36. and the mandrel drive shaft 41 of the expansion/contraction mandrel 32
The final stage of rolling is carried out at such a tension that no reel mark is left on the metal strip plate 6, the inner diameter of the coil is not crushed when the product coil is taken out from the mandrel, and the segments of the expansion/contraction mandrel are not damaged. Let's do it. Expanding and contracting mandrel 3 of winding and unwinding machine 35 on the exit side by rolling in the final stage
The metal strip that has been wound up into a product coil is taken out by the expansion and contraction mandrel 32 by the contraction operation of the segments 10 (see Fig. 2) in conjunction with the backward movement of the mandrel shaft 11 of the expansion and contraction mandrel 32. The coil car 45 that has been waiting there transports the vehicle. Therefore, while using the solid mandrel, there is no risk of reel marks being formed on the metal strip, and there is no risk of damaging the segments.
In addition to rolling with ideal high tension, the final bus is wound with an expanding mandrel, making it easy to take out the product coil and work efficiently. In the return machine, one electric motor is switched to drive each mandrel, so there is no need to increase the number of electric motors, instead of the conventional one. It is possible to perform rolling with supplementary points.

In the present invention, at least in the bus preceding the final bus, all the coils must be unwound from one mandrel and wound from the solid mandrel to the expansion and contraction mandrel, which may cause some reduction in efficiency. However, this work of changing the ends of the coil only needs to be done once when at least the previous stage of the final bus among the multiple buses is completed, and if a reversing type rolling mill is used, the work of changing the ends of the coil is done at the front and rear ends of the metal strip. It is inevitable that some parts will remain that will not be used as a product, so if you cut them off at this time, you will not have to worry about cutting them out in the next process, and there will be no problem.

The tip of the metal strip is cut off using a shear or pobble shear built into the rolling mill. As above,
By arranging the solid mandrel and the expansion mandrel before and after the rolling mill, there is an advantage that the product coil can be taken out and carried out even when the final bus is rolled in an even number of buses, making it easier to use.

Figures 9 and 10 show a winding and unwinding machine 50, which has dedicated electric motors 46 and 47 and a solid mandrel 48 and an expansion/contraction mandrel 49 arranged side by side, which can be driven simultaneously or separately, on the inlet side of the reversing rolling mill 1. , and shows another embodiment in which a take-up and rewind machine 35 having the same structure as the take-up and rewind machine shown in FIG. 8 is disposed on the output side.

To explain the power transmission mechanism of the winding and rewinding machine 50 installed on the input side, there are rings fixed to the mandrel drive shaft 53 of the solid mandrel 48 before and after the fixing ring 52 attached to the output shaft 51 of the electric motor 46. a gear 55 that meshes with the gear 54;
Gears 58 that mesh with gears 57 fixed to the mandrel drive shaft 56 of the expansion/contraction mandrel 49 are rotatably attached to the output shaft 51, and a slide ring is rotatable together with the fixed ring 52 and slidable in the axial direction. 59 is gear 5
5 or the gear 58 to function as a switching device, the output of the electric motor 46 is transmitted to either the mandrel drive shaft 53 or the mandrel drive shaft 56, and the mandrel drive shaft A gear 62 that meshes with a gear 61 fixed to an output shaft 60 of an electric motor 47 dedicated to rewinding is rotatably provided on the mandrel drive shaft 56 . The slide ring 63, which can rotate together with the convex portion, slides in the axial direction and functions as a clutch.
The output of the electric motor 47 can be transmitted to the mandrel drive shaft 56.

The solid mandrel 48 is supported on both sides by bearings 64, but as shown in FIG.
It is also possible to move the coil in the axial direction so that the center of the coil in the width direction can be aligned with the center of the rolling mill. With the above configuration, the metal strip 6 can be rolled with high tension by the solid mandrel 48 on the input side and the solid mandrel 31 on the output side to perform ideal rolling. Expansion mandrel 4
The material coil inserted in the material coil 9 can be rotated by the electric motor 47 and prepared for rolling by the opening device. is inserted into the expansion/contraction mandrel 49 on the entry side, and the slide ring 52 is slid in the direction of the mandrel to fit with the convex part of the gear 58,
Furthermore, by sliding the slide ring 63 toward the motor side to connect the mandrel drive shaft 56 and the output shaft 51, and winding up the metal strip 6 by the expansion/contraction mandrel 32 on the output side, when the motor 46 is reversed, It is also possible to make use of the power generation effect of.

In addition, since the solid mandrel 48 is supported on both sides, there is no bending of the mandrel due to tension or coil weight.
Uniform tension can be applied across the width of the metal strip. 12, 13, and 14 show an example in which a rotary winding and unwinding machine equipped with two mandrels, a solid mandrel and an expanding/contracting mandrel, is arranged before and after the reversing rolling mill 1. A solid mandrel 66 and an expansion/contraction mandrel 67 are arranged side by side, and the mandrel drive shaft 68 of the solid mandrel 66 and the output shaft 71 of the reducer 70 on the electric motor 69 side are connected via a clutch 72, and the mandrel drive shaft of the expansion/contraction mandrel 67 is connected to the output shaft 71 of the reduction gear 70 on the electric motor 69 side. 73 and the output shaft 76 of the reducer 75 on the electric motor 74 side are connected via a clutch 77, and both mandrel drive shafts 68, 73 are simultaneously moved by the extension operation of a hydraulic cylinder 78 fixed to the rotating frame 65, and the clutch 72, 77, and then rotate the frame 65.
is rotated 1807 times so that the positions of the solid mandrel 66 and the expansion/contraction mandrel 67 can be exchanged. 7 in the diagram
Reference numerals 9 and 80 indicate belt wrappers, and the same reference numerals as in FIG. 7 indicate the same parts. In FIG. 12, the tip of the metal strip 6 that has been rolled a required number of times to a predetermined thickness is wrapped around an expanding and contracting mandrel 66b of a rotary take-up and unwinding machine 81 on the output side using a belt trapper 80 to create a final bus. This shows a state in which rolling is about to be carried out, and when the winding of the product coil around this expansion/contraction mandrel 67b is completed, the couplings 72 and 77 are cut by the operation of the hydraulic cylinder 78 (the 14th
After rotating the rotating frame 65b 180 (see figure), the hydraulic cylinder 78 is operated again to engage the clutches 72 and 77, and the product coil removed from the expansion/contraction mandrel 67b is placed on the coil car 45 on the exit side and carried out. In addition, the expansion/contraction mandrel 67a of the entry-side take-up/unwinder 82 into which the material coil conveyed by the entry-side coil car 26 has been inserted and the empty solid mandrel 66a are attached to the rotating frame 6.
5a is rotated to change the position and pass the tip of the metal strip of the raw material coil through the rolling machine to start the first stage rolling,
When the first stage rolling is completed, the rotating frame 65a is rotated again and the tail end of the metal strip 6 is wrapped around the solid mandrel 67a using the belt wrapper 79, thereby starting the second stage rolling.

In this way, winding and unwinding can always be done at the same position, so it is sufficient to install one belt trapper on the entry side and one on the exit side, which is convenient for the work at the beginning of winding, and the coil car can also be installed on the entry side. It is sufficient to install one each on the exit side and one on the exit side, and winding can be performed while rolling from the expansion and contraction mandrel on the input side to the expansion and contraction mandrel on the output side, and in this case, the power generation effect when the electric motor 69 is reversed can be used. Therefore, it can be used for skin bath rolling, and the material coil can be rotated in the rolling preparation position, making it easy to open the coil roll.
Further, since the product coil can be rotated at the coil take-out position, it is possible to eliminate the inconvenience that the metal strip on the inner diameter side of the coil remains on the mandrel and becomes bamboo-like when the product coil is taken out from the mandrel. 15 and 16, a solid mandrel 83 is pivotally attached to the tip of a lever 86 that rotates around a fulcrum 85 by the operation of a hydraulic cylinder 84, and an expansion/contraction mandrel 87 is slid on a base 89 by the operation of a hydraulic cylinder 88. A clutch 93 is interposed between the output shaft 91 and a mandrel drive shaft 92 of the solid mandrel 83 to drive the solid mandrel 83. When the expansion/contraction mandrel 87 moves backward, the mandrel drive shaft 9
2 and an output shaft 91 are connected by a clutch 93, and winding and unwinding machines 94 are installed at the front and back of the reversing rolling mill 1, which are configured to move the solid mandrel 83 backward and the expansion mandrel 87 forward when preparing for rolling. Another embodiment of the present invention is shown in FIG. 15, in which the expanding and contracting mandrel 87 of the take-up and unwinder 94 on the exit side performs winding for rolling the final bus.

In the figure, reference numeral 95 indicates an electric motor, and reference numeral 96 indicates a hydraulic cylinder for aligning the widthwise center of the coil with the center of the rolling mill. If carried out in this way, winding and unwinding can always be done at the same position, so it is sufficient to install one belt trapper on the entry side and one on the exit side, which has the advantage of being convenient for the work at the beginning of winding. . 17 and 18 show that the teeth 97 formed on the outer periphery of the gear 9
A solid mandrel 100 and an expanding/contracting mandrel 101 are arranged side by side facing in opposite directions on a horizontal rotation frame 99 that meshes with the gear 8 and rotates in the horizontal direction by the drive of the gear 98, and the required position for winding or unwinding is set. This figure shows another embodiment of the winding and rewinding machine in which the output shaft 103 of the electric motor 102 and the drive shafts 104, 105 of each mandrel can be connected via clutches 106, 107 when each mandrel is located at In the figure, reference numeral 108 denotes a hydraulic cylinder that operates the clutch by moving the clutch piece on the output shaft 103 side forward and backward by rotating the lever 110 about the fulcrum 109.

If carried out in this way, it is possible to stably support the mandrel, and since winding and unwinding can always be done at the same position, the belt trapper can be shared, which is convenient for the initial work of winding, etc. There are advantages. 19 and 20 show a solid mandrel 115 and an expanding/contracting mandrel 116 mounted on a horizontal rotating frame 114 that meshes with teeth 111 or gears 112 formed on the outer periphery and rotates horizontally on a fixed frame 113 by the drive of the gears 112. The mandrels are arranged side by side facing in opposite directions and are positioned to perform winding or unwinding operations, and the mandrels are positioned to receive the material coil from the input coil car or to load the product coil to the output coil car. This figure shows another embodiment of the winding and unwinding machine in which two electric motors are arranged so that the coils can be driven at the same time. 119 is a clutch, and 120 is a hydraulic cylinder for actuating the clutch 119. FIG.

If the winding and unwinding machine configured as described above is placed on the inlet side of the rolling mill, it will be easier to open the coil in preparation for rolling the raw coil, and if it is placed on the outlet side, it will be easier to open the coil when taking out the coil from the mandrel. This eliminates the inconvenience of the coil becoming bamboo-shaped. In each of the above-mentioned embodiments, a sleeve was not used on the inner diameter portion of the coil when the coil was extracted from the expansion/contraction mandrel, but it is also possible to fit the sleeve onto the expansion/contraction mandrel and extract the entire sleeve.

This is because, in addition to the winding force, the weight of the coil is considered to be the cause of the collapse of the inner diameter portion of the coil. Furthermore, in the above embodiment, the material coil was inserted into a mandrel that expands and contracts, but a method of unwinding and rolling the coil from a mandrel that does not expand and contract, for example, a method of unwinding the coil using a known coil box, etc. is also considered. It will be done.

In addition, the strip can be wrapped around the mandrel using either a grip or a belt trapper, and multiple belt trappers may be provided on each side as necessary.
Furthermore, in each of the above-described embodiments, the solid mandrel and the expansion mandrel were arranged both at the front and rear of the rolling mill, but the expansion and contraction mandrels do not necessarily have to be installed at the front and rear, and the object of the present invention can be achieved by providing them at either side. Moreover, in the embodiments shown in FIGS. 9 and 12, only one unwinding machine (expansion mandrel) is arranged on the entry side, but the unwinding machine on the entry side is a tension reel (unwinding machine). Alternatively, a separate unwinding machine may be provided.If implemented in this manner, there is an advantage that the coil can be efficiently taken out from the input side.

According to the present invention, it is possible to roll a product without an i-reel mark.

11. Damage to the mandrel due to strong tension is eliminated.

111 No need for a large expansion/contraction cylinder to counter strong tension.

Since rolling can be performed while applying strong tension,
The rolling load is reduced and products with good shapes can be rolled.
Thinner products and harder materials can be rolled with the same work roll diameter.

v Compared to the conventional method using a solid mandrel, equipment costs are lower, work efficiency is better, and energy consumption is lower.

■ Product coils can be taken out from either the front or rear sides of the rolling mill, which is convenient.

- Product coils can be taken out from either side of the rolling mill, which is convenient, and rolling preparation work can be carried out efficiently.

It can produce excellent effects such as

[Brief explanation of drawings]

Figure 1 is an overall view of the reversing rolling equipment, Figure 2 is a vertical cross-sectional view of the expanding and contracting mandrel, Figure 3 is a view taken in the direction of the ■ arrow in Figure 2, and Figure 4
The figure is an enlarged view of part ■ in Figure 3, Figures 5 and 6 are general views of the reverse rolling equipment when the winder is equipped with a solid mandrel, Figures 7, 9, 12, Fig. 15 is an overall view of a rolling equipment for explaining an embodiment of the rolling method of the present invention, in which a solid mandrel and an expansion/contraction mandrel are arranged on the inlet and outlet sides of the rolling mill, respectively, and Fig. 8 and Fig. 7 are An explanatory diagram of a winding and unwinding machine in which a solid mandrel and an expanding/contracting mandrel arranged at the exit side of the rolling mill can be driven by one electric motor by a switching transmission device. Figure 10 is the entrance side of the rolling mill shown in Figure 9 The device for driving the solid mandrel and expansion/contraction mandrel arranged in the machine is equipped with an electric motor exclusively for rewinding, and the electric motor for driving the solid mandrel can operate in reverse when driving the expansion/contraction mandrel for rewinding. An explanatory diagram of the winding and unwinding machine, FIG. 11 is an explanatory diagram of another embodiment of the solid mandrel support part, and FIG. A front view of the take-up unwinder, FIG. 14 is a sectional view taken from the x direction in FIG. 17 to 20 are explanatory diagrams of other embodiments of the winding and unwinding machine of the rolling device used in the rolling method of the present invention. 18 is an explanatory diagram of a horizontal rotary take-up and rewind machine capable of rewinding operation.
19 is an explanatory diagram of a horizontal rotary winding and unwinding machine equipped with an electric motor exclusively for unwinding so that the expansion and contraction mandrel can be driven in preparation for rolling even in the standby position. FIG. 20 is a sectional view taken from the XX direction in FIG. 19. 1 is a reverse rolling mill, 2 is a work roll, 29, 35, 50
, 81, 82, 94 are winding and unwinding machines, 31, 48, 66,
66a, 66b, 83, 100, 115 are solid mandrels, 32, 49, 67, 67a, 67b, 87, 1
01,116 is expansion mandrel, 34,46,47,6
9, 14, 95, 102, 117, 118 are electric motors, 6
5 and 65a are rotating frames, and 99 and 114 are horizontal rotating frames.

Claims (1)

[Claims] 1. A non-expandable mandrel with a coil winding section that does not expand or contract is arranged before and after the reversible rolling mill, and the coil is unwound from the expandable mandrel that has a coil winding section that expands or contracts, and the tip of the coil is rolled as described above. After passing through the machine, the coil is guided to one non-expandable mandrel, and when the coil end is separated from the above-mentioned expandable mandrel by winding the coil by the one non-expandable mandrel, the coil end is wound around the other non-expandable mandrel,
After that, the work rolls and non-expanding mandrel of the above rolling mill were
Roll the coil the required number of times by reversing each pass, and then
A rolling method characterized in that the coil is wound by an expansion and contraction mandrel different from the expansion and contraction mandrel described above.