JPS60250811A - Crank mill for continuous type hot rolling equipment - Google Patents

Abstract

PURPOSE:To join smoothly and quickly the ends of a preceding material and succeeding material and to improve efficiency and quality by subjecting simultaneously said ends to connection by press welding and to rolling. CONSTITUTION:The slab extracted from a heating furnace is rolled down by a roughing mill and thereafter the nose of the slab is raised by a nose raising roll E. The press contact surface is then descaled by wire brushes K in an oxygen- free atmosphere chamber J into which N2 is fed under the pressure. The preceding material is fed to a finishing mill and is engaged wth the top of the succeeding material at the speed controlled by pinch rolls C so that the ends of the two materials are superposed in the position just near a crank mill F so as to have an allowance for a lap. The feed speeds of both materials are thereafter synchronized by controlling the pinch rolls C until the materials arrive at the draft position of the mill F; at the same time, the materials are transferred in the chamber J and are press-welded during traveling in the chamber by the mill F.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial field of application The present invention relates to a crank, which functionally constitutes the main part of continuous hot rolling equipment that continuously performs hot rolling.
It's about mills.

(B) Prior Art In conventional hot rolling, heated slabs are fed one by one to a rolling line, and each slab is subjected to intermittent rolling in a rough rolling mill and a finishing mill. In this method, when the rolled material passes through the rolling mill, the leading end of the rolled material may hit the guide or roll, and when the trailing end passes through the rolling mill, it may be narrowed depending on the shape of the trailing end or the rolling conditions. This often caused problems such as roll damage. In order to avoid such troubles, it is necessary to take measures such as lowering the rolling speed, and once a trouble occurs, the downtime of the line will increase, leading to an increase in the roll consumption rate. . In addition, the center of the width of the rolled material may protrude in the rolling direction and become narrow, resulting in the material being cut off without being able to obtain the desired width.
In addition, the width of the tip of the rolled material becomes narrow due to a sudden rise in tension immediately after the finishing work roll is bitten and when winding the material into a down coiler, and the desired width may not be obtained.

Therefore, in recent years, as a method to solve this problem, the trailing end of the preceding rolled material and the leading end of the following rolling material are overlapped on the exit side of the rough rolling mill, and the side surfaces are temporarily welded. A method has been proposed in which rolled materials are joined together and continuously rolled. However, with this method, the joint part of the rolled material becomes thicker than other parts, which causes rapid load changes to be applied to the next finishing mill, resulting in variations in board thickness. Furthermore, tack bonding has the disadvantage that the bonding strength between parts is weak, leading to frequent rolling troubles.

In order to improve these defects, between the rough rolling mill and the finishing mill, the trailing end of the preceding rolled material and the leading end of the trailing rolling material are overlapped, and the overlapping part is crimped and joined. A method of rolling has been proposed.

For example, Tokuko Showa 5. ! Publication No. t-39195 describes pressure bonding using a press having a flat tool.

Further, Japanese Patent Publication No. 56-45712 discloses a rotary press crimping bonding equipment that performs crimping bonding using a crimping body provided on a drum. However, these prior art techniques do not provide a fully satisfactory bonding method and apparatus and have the following drawbacks.

In the method described in Japanese Patent Publication No. 54-39195 mentioned above, it is necessary to control the running of a heavy press in synchronization with the rolling material, which poses a cost problem in actual production equipment. Furthermore, in the method described in Japanese Patent Publication No. 56-45712, it is necessary to join the polymerized parts using a crimped body in an extremely narrow part of the drum.On the other hand, the running speed of the rolled material is constantly fluctuating, and the drum Synchronous control is extremely difficult,
A slight disturbance in synchronization may result in failure to join, or poor engagement may result in bumping.

Therefore, the present inventors solved the above problems and aimed to improve efficiency by smoothly and quickly joining the rear end of the preceding rolled material and the leading end of the trailing rolled material, and at the same time improve the quality of the product. We have already developed continuous hot rolling equipment that improves
(Japanese Patent Application No. 59-40240).

(c) Purpose of the Invention The purpose of the present invention is to provide a specific configuration of a crank mill that is an essential component in the above-mentioned continuous hot rolling equipment, and to realize highly efficient continuous hot rolling operations. The goal is to make it even easier to realize.

2) Composition of the Invention [Continuous hot rolling equipment] according to Japanese Patent Application No. 59-40240
In this method, a crank mill is installed between a rough rolling mill and a finishing mill on a rolling line to join the ends of the leading material and the trailing material. The feature is that strong, uniform thickness, and quick bonding can be achieved by simultaneously performing the above steps. below,
Prior to explaining the present invention, the equipment configuration and operation of the aforementioned Japanese Patent Application No. 59-10240 will be schematically explained with reference to FIG.

The equipment of the earlier application is installed between the final stand 9 of the rough rolling mill A and the finishing mill H along the rolling line. First, material detector B is installed at the most upstream position on the outlet side to the rough rolling mill, and then material detector B is installed in the most upstream position on the exit side to the rough rolling mill, and
A measuring roll C, a pinch roll D, a nose-up roll E, a crank mill F, and a second measuring roll G are installed at predetermined intervals, and a series of these mechanisms is linked together by a control section. It was made to work.

The passage of the tip of the rolled material is detected by the material detector B, and the control section (2) issues an operation command to each roll.

Feed speed v1 of the trailing material at the first measuring roll C
At the same time, the speed v2 of the preceding material is detected by the second measuring roll G, and from the result, the following material is pinched.
The speed is increased with roll D, the leading end of the trailing material is raised up with roll E, and the leading end of the trailing material is engaged with the rear end of the leading material at the position of crank mill F. The overlapping parts are crimped and joined by a crank mill F, thereby connecting the preceding material and the succeeding material as one body, and rolling the joined part to the same thickness as the other parts. It is.

In the present invention, the specific configuration of the crank mill F, which plays the most important role in the above-mentioned continuous rolling equipment, will be clarified.

As mentioned above, the crank mill of the present invention can simultaneously perform the work of joining the ends of both the front and rear materials by rolling down, and the work of rolling the joined part to the same thickness as other general parts. It is necessary to perform this work quickly and reliably in synchronization with the feed rate of the material. In this crank mill, at least one of the upper and lower work rolls is used as a drive roll, but in addition to this, in order to satisfy the above-mentioned requirements, at least one of the upper and lower work rolls, for example, the upper roll, is configured to be able to move up and down. However, it is preferable that this elevating roll operating mechanism is provided with a quick return mechanism and a trouble joint mechanism for increasing the reduction blade.

A six-crank mill illustrating one embodiment of the present invention in FIGS. 2 and 6 is provided with a pair of upper and lower work rolls 2 within a frame 1. As shown in FIG. Of these, the upper roll 2 is rotatable 1 (the supporting roll chock 3 is freely raised and lowered,
The driving force from the drive motor 40 is transferred to the flywheel 41.
The crank 5 is driven by the power transmission mechanism 4 consisting of a coaxial gear 42 and a main gear 46 that meshes with this gear 42.
The upper roll 2 is moved up and down by a crank mechanism centered around the crank 5.

An embodiment of the crank mechanism for raising and lowering the roll chock is shown in FIGS. 4 and 5. An intermediate member 6 having a substantially triangular shape is freely rotatably attached to an eccentric shaft 51 of the crank 5 that rotates together with the main gear 43. One end of a swing link 7 and one end of a connecting rod 8 are pivotally attached to this intermediate member 6 at separate and distant positions. The other end of the swing link 7 is pivotally fixed to the frame 1, and the other end of the connecting rod 8 is pivotally connected to a connecting point of a joint link 9 that suspends the roll chock 6.

The joint link 9 consists of an upper link 91 and a lower link 92. The upper end of the upper link 91 is swingably fixed to a part P of the frame, and a roll chock 6 is attached to the lower end of the lower link 92. are interconnected. The upper and lower links 91 and 92 are pivotally connected at approximately the midpoint of their total length, and when this pivot point is pushed and bent by the connecting rod 8, the hanging length changes and the roll chock is formed. The position of B can be moved up and down.

One of the operating principles of the crank mechanism in this device is shown in FIGS. 6 and 7. As the eccentric shaft 51 of the crank 5 rotates on the circular orbit 50, the intermediate member 6 also rotates around the crank 5.
It rotates while being displaced around the fixed axis O.

Since the swinging link 7 and the linking rod 8 are pivotally connected to the intermediate member 6, the swinging posture during turning is restricted to a certain range of variation, but this swinging motion causes the linking rod 8 to move forward and backward in a fixed range. will be given. Then, in the most pushed out state (Fig. 8 (A)), the joint link 9 is bent to the maximum and the roll chock is pulled up to the highest point, and in the most drawn state (Fig. 4), the joint link 9 is・
The link 9 is made straight and the roll chock 6 is lowered to the lowest point. As shown in FIG. 6, this configuration in which the connecting rod 8 is pushed by the rotation of the intermediate member B, thereby operating the joint link 9, constitutes a kind of trouble joint mechanism. At the lowest point state where the link 9 is in a straight line, the lowering blade of the upper roll 2 doubles more than just the lowering pressure.

The position of the intermediate member 6 changes as the crank 5 rotates,
The series of representative operations in which the connecting rod 8 is pushed and pulled to change the degree of bending of the joint link 9, thereby raising and lowering the upper roll 2, is illustrated in FIG. 7. That is, when the crank 5 is at the position shown by the solid line, the intermediate member 6, the connecting rod 8, and the links 91, 92 that are interlocked with it are at the position shown by the solid line, and therefore the upper roll 2 is located at the lowest point (FIG. 4).

Next, when the crank 5 rotates 1/4 and the eccentric shaft 51 rotates to the position indicated by the two-dot chain line, each member connected thereto moves to the position indicated by the two-dot chain line, and the final upper roll 2 rotates to the position indicated by the two-dot chain line. It rises to the maximum position (Fig. 8(A)).

Furthermore, when the crank 5 rotates 1/4 and reaches the position shown by the broken line, each member also moves to the position shown by the broken line, and the upper roll 2 slightly descends to the position shown by the broken line (FIG. 8(B)).

When the crank 5 rotates another 1/4 and reaches the position indicated by the dash-dotted line, each member also moves to the position indicated by the dash-dotted line, and the joint
The link 9 approaches a nearly straight line, and the upper roll 2 comes to a position just before the lowest point (see Figure 8). - The link reaches its maximum extension, and the upper roll 2 descends again to its lowest point (Fig. 4).

At this time, the materials are crimped and joined.

As is clear from the above, the upper roll 2 returns quickly when moving from FIG. 4 to FIG. 8(A). Further, when the upper roll 2 moves from FIG. 8(B) to FIG. 4, the boosting force is applied at a slow speed.

Therefore, in the crank mill of the present invention, in the pressure bonding process, a certain rolling time and double pressure are applied, pressure bonding and rolling are performed while slowly controlling the speed, and when the rolling work is completed, the upper roll 2 is quickly moved to the original material. It can be lifted into position and ready for the next rolling operation.

(e) Thickness 270 in x Width 1600 m extracted from the example heating furnace
After rolling two slabs (1250'C) of 1250'C to a thickness of 0mm using a rough rolling mill consisting of 6 stands on a normal rolling line, they were rolled to a thickness of 30mm using a raised roll E.
I went up n. Thereafter, the pressure contact surface was descaled in a lengthwise direction of 50 mm over the entire width using a wire brush in a N2 press-fitted non-oxidizing atmosphere chamber. At this time, the temperature of each rough bar was 950 to 1000°C. At this time, the leading material was sent to the finishing mill at a speed of 0.75 m/see, so the speed was controlled by the pinch roll (AL) to engage the top of the succeeding material, and the overlapping allowance was maintained at 30 rrLTrL, and the material was transferred to the crank mill. Superimposed at the position closest to F.

Thereafter, the feeding speed of the art materials is synchronized by the control π of the pinch roll C until they reach the reduction position of the crank mill F, and the materials are transported through a sealed chamber with a non-oxidizing atmosphere in which N is press-fitted, and The parts were pressed together by a mill while running, and the thickness of the pressed part was 0 mm. The pressure of the crank mill at this time was 22kg/mm! , load is 1100)
It was.

When this rolled material was conventionally rolled in the finish rolling process, it was possible to perform continuous rolling without causing breakage, and it was possible to complete the hot rolling process to obtain a copper strip with a thickness of 2 mm and a width of 160'Omm. did it.

In addition, if there is no particular need for a quick return operation of the roll after the rolling operation, or if there is no particular need for the rolling operation with a large torque, the intermediate member 6 and the swing link 7 shown in FIG. 6 may be used. Toggle link mechanism (10th
The object of the present invention can also be achieved by using a crank mechanism using an eccentric shaft or an eccentric gear (see FIG. 11) as the roll lifting/lowering mechanism.

(f) Effects Since the crank mill of the present invention has a structure suitable for joining hot steel strips, it can perform powerful and quick joining in conjunction with other related devices.

Furthermore, there is no need to stop the line for bonding, so it is extremely efficient. Furthermore, since the joint portion is not thicker than other portions, load fluctuations are not applied during the finish rolling process, and rolling troubles and variations in plate thickness do not occur. Furthermore, since the crank mill of the present invention performs crimping and rolling while raising and lowering one of the upper and lower work rolls, it is easy to reduce the bite angle β shown in FIG. It is possible to prevent troubles such as bumps that tend to occur when the In addition, it is possible to roll down any part of the outer circumference of the work roll, and the bite angle β at the start of rolling can be selected over a wide range, so even if the timing of the start of lowering the work roll on the lifting side is slightly off, Only the biting angle β at the start of rolling changes slightly, and reliable crimp joining can be achieved without any problem.

As described above, the crank mill of the present invention is extremely effective as a crank mill for continuous hot rolling equipment.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram schematically showing the overall structure of a continuous hot rolling facility equipped with a crank mill according to the present invention. FIG. 2 is a side view showing one embodiment of the crank mill according to the present invention. FIG. 6 is a front view of FIG. 2 seen from the ■-■ direction. Fourth
The figure is a partial view showing an enlarged version of a crank mechanism which is a main part of the device of the present invention. FIG. 5 is a drawing of FIG. 4 viewed from the v-■ direction. FIG. 6 is a diagram showing one principle of the main mechanism according to the present invention. FIG. 7 is an explanatory diagram showing the operation process of the main mechanism. FIG. 8 is an explanatory diagram of each operating process in the main parts of the crank mill of the present invention. FIG. 9 is an explanatory diagram of the bite angle at the start of rolling of the crank mill of the present invention. FIGS. 10 and 11 are diagrams showing other embodiments of the roll lifting/lowering operating mechanism of the present invention. 1: Frame 2: Work roll 6: Roll chock 4: Power transmission mechanism 5: Crankshaft 6: Intermediate member 7: Swing link 8: Link 9: Joint link 10: Leading rolled material 11: Trailing rolling material

Claims (1)

[Claims] In a crank mill for crimping steel plates used in continuous hot rolling equipment, which is installed between the final stand of the rough rolling mill and the finishing mill and connects the rear end of the preceding rolled material and the leading end of the following rolled material, At least one of the work rolls is a driving roll, and a crank mechanism is provided to freely raise and lower at least one of the upper and lower work rolls, and the peripheral speed of the work roll is continuously driven in synchronization with the material speed. A motor for operating a crank mechanism and a power transmission mechanism are provided to simultaneously perform a crimping joining operation and a rolling operation on the overlapping portion of the rear end of the preceding material and the leading end of the succeeding material. A crank mill for continuous hot rolling equipment featuring: