CN106826244A - A kind of middle base attachment means and system - Google Patents

Abstract

The invention provides a kind of middle base attachment means, including for clamping the outlet clamping device of base in the middle of preceding block, for the entrance clamping device of base, the frictional disk rubbed for the connecting end surface to base in the middle of base in the middle of preceding piece and rear block in the middle of block after clamping and the upsetting machine for applying upset force, the frictional disk is located between entrance clamping device and outlet clamping device, and the frictional disk is connected with for driving frictional disk to rotate and mobile drive mechanism.Frictional disk is stretched between preceding block centre base and rear block centre base, end face to both rubs, middle base end face and near zone is set to be brought rapidly up reaching visco-plasticity state, and upset force is applied to base in the middle of rear piece by upsetting machine, base in the middle of base in the middle of preceding piece and rear block is linked together after frictional disk is removed.Simple structure of the present invention, bonding strength are high, connection speed is fast, energy consumption is low, it is adaptable to the connection between unlike material slab.

Description

An intermediate blank connecting device and system

technical field

The invention belongs to the field of hot rolling equipment, and relates to a connection device and system for an intermediate billet used in the process of converting conventional hot rolling into endless rolling in the iron and steel industry.

Background technique

The production of traditional strip hot continuous rolling finishing mills is carried out with a single intermediate billet for rolling, and entering the finishing mill generally goes through processes such as strip threading, accelerated rolling, decelerated rolling, steel throwing, and tail flicking. In the process of finishing rolling, especially in thin-gauge rolling, it is easy to bite into the head of the strip between the finishing stands and be blocked, forming piles of steel, slipping and tail flick folding, and tail flicking forms fold bite, resulting in damage to the roll surface etc.; during coiling, due to the serpentine shape and bending of the front end of the strip, the coiling is difficult to form piles of steel, etc.; for single billet rolling, load prediction and roll gap value setting must be carried out for each billet. Force prediction is inaccurate, because the rolling force prediction error will cause strip thickness, crown change and plate shape fluctuation between stands; in thin gauge rolling, due to the fast heat dissipation of the strip, in order to ensure the thin strip rolling temperature It is necessary to increase the strip threading speed and stabilize the rolling speed as much as possible, but after the strip threading speed is increased, the failure rate caused by various strip threading problems and head folding will increase, so the traditional hot rolling production is limited to a certain extent; in addition, the finishing mill The interval between coils also affects the production capacity of the rolling mill.

Endless rolling of hot-rolled strip refers to rolling the billet in the finishing rolling stage without dividing the billet into pieces, one-time strip threading, and continuous finishing rolling. The rolled strip is divided into coils according to the required weight by high-speed flying shears. Endless rolling surpasses the limitation of intermittent rolling while solving the above intermittent rolling problems: solve the strip threading problem through endless rolling; improve quality stability and yield through stable rolling; reduce strip threading times, and The time between coiling is almost zero to improve production efficiency; it can produce ultra-thin strip steel or wide sheet that exceeds the limit rolling size in the past, as well as new varieties through lubricated rolling and forced cooling rolling. The endless rolling technology has improved the strip yield, dimensional and shape accuracy, and the ratio of thin and ultra-thin specifications, realized part of the "replacing cold with heat" and reduced the consumption of rolls, and achieved remarkable results. This technology is a leap in steel production technology and represents the cutting-edge technology of hot-rolled strip steel in the world today.

In the endless rolling technology, the connection technology of the intermediate billet after rough rolling is one of the key technologies to realize the endless rolling. Since the finish rolling unit adopts tension rolling, the connection quality of the intermediate billet in the hot state affects whether the endless rolling can be realized. If the connection time is too long, it will not only affect the production efficiency, but also cause a significant temperature drop, making it difficult for subsequent finish rolling. If the connection strength is not high and the quality is not good, the connection is prone to breakage, making continuous finishing rolling impossible; and the connection equipment should not be complicated, otherwise it will not only limit the installation position of the equipment, but also increase investment and production maintenance. cost.

At present, the connecting methods of the endless rolling intermediate billet mainly include stacking rolling crimping method, butt crimping method, welding method, mechanical connection method, reducing flame treatment connection method, direct electrification connection method, induction heating connection method and laser welding method, etc. . Among these joining methods, there are induction heating joining methods, laser heating joining methods, and shear friction joining methods that have reached industrial applications.

The induction heating connection method is a connection technology adopted by Kawasaki Steel. This method is to maintain a small gap between the tail end of the front slab and the front end of the rear slab. In this state, an alternating magnetic field is applied in the thickness direction of the plate, and the The joint end faces of the two slabs generate an induced current. The end surface of the slab heats up due to the Joule heat caused by the induced current, and then the joint surface is crimped to complete the connection. In this connection method, since the current flowing through the corners of the ends of the strip is much smaller than the current flowing through the middle during induction heating, unbonded parts remain at the ends of the connection surfaces. At the same time, the temperature of the connection zone is higher than that of other parts of the strip, and its strength is lower than other regions. Therefore, the connection zone becomes a weak link in the endless rolling process and is prone to broken strips.

The laser thermal welding method is a connection technology adopted by Nippon Steel. Compared with the induction heating connection method, it can eliminate the existence of unjoined parts on the connection end face, but there are still problems that the temperature of the joint part is higher than other parts and the applicable steel types are limited; Moreover, the power required by the laser is very large, which significantly increases equipment investment and production costs.

The shearing friction joining method is to use a specially designed shearing machine to cut off the overlapping area of the intermediate billet along the inclined plane, and form two non-oxidized surfaces through shearing. The shearing force makes the two newly formed surfaces move relative to each other, and friction , a large amount of heat energy is generated, which accelerates the surface diffusion, and the shearing machine applies pressure to the beveled surface while shearing to form a physical bond along the sheared surface. This connection method is mainly suitable for the connection of the same material because it applies pressure to the shear surface for physical connection. When different materials are connected, the strength of the connection area is also affected due to the difference in chemical composition and physical metallurgical properties. At the same time, The equipment is huge, takes up a lot of space, and has problems such as high equipment investment and maintenance costs.

In a word, the connection methods of intermediate blanks in the prior art all have one of the problems of large equipment investment, low connection strength of intermediate blanks, slow connection speed, not suitable for connection of dissimilar steel materials, huge equipment, and high maintenance costs. or several.

Contents of the invention

In view of the deficiencies of the prior art described above, the purpose of the present invention is to provide a connecting device for hot-rolled strip endless rolling intermediate blanks with simple structure, high connection strength and fast connection speed.

In order to achieve the above-mentioned purpose and other related purposes, the technical scheme of the present invention is as follows:

An intermediate blank connecting device, including an outlet clamping device for clamping the front intermediate blank, an inlet clamping device for clamping the rear intermediate blank, and a connecting device for the front intermediate blank and the rear intermediate blank A friction disc for friction on the end surface and an upsetting device for applying upsetting force, the friction disc is located between the inlet clamping device and the outlet clamping device, and the friction disc is connected with a driving mechanism for driving the friction disc to rotate and move .

When connecting, the outlet clamping device and the inlet clamping device clamp the front middle blank and the rear middle blank, and extend into the friction disc between the front middle blank and the rear middle blank, and rub the end faces of the two. The temperature of the end surface of the middle billet and the surrounding area is rapidly raised to a viscoplastic state, the friction disc is lifted quickly, and the upsetting device applies an upsetting force to the rear middle billet to connect the front middle billet and the rear middle billet together. Wherein said movement can be only up and down movement, also can be up and down and horizontal movement at the same time.

Further, it also includes a friction disc traversing tool rest and a friction disc depressing tool rest, the friction disc is installed on the friction disc traversing tool rest, and the friction disc traversing tool rest is installed in the friction disc depressing tool rest, the The driving mechanism includes a power mechanism that drives the friction disc to rotate, and a push mechanism that drives the friction disc to traverse the tool holder to reciprocate laterally and drive the friction disc to press down the tool holder to move vertically.

Further, when the friction disc traverses, it moves back and forth along the width direction of the intermediate billet, and the distance of the traverse ensures that the friction disc is in contact with the entire cross-section of the intermediate billet.

Further, when the friction disc moves downward, it penetrates below the lower surface of the intermediate billet.

Further, both the inlet clamping device and the outlet clamping device include upper and lower clamping blocks, and the length of the upper and lower clamping blocks is greater than the width of the intermediate billet.

Further, there are one or more friction discs, and when there are multiple friction discs, they are arranged in a line at equal intervals along the width direction of the intermediate billet.

Further, the friction disc is connected with the power mechanism through a telescopic universal joint shaft.

Further, the upsetting device is located in front of the entrance clamping device, and the upsetting device applies an upsetting force to the middle billet of the rear block through the entrance clamping device.

The present invention also provides an intermediate blank connecting system, which includes the above-mentioned intermediate blank connecting device, and also includes a hot coil box, a pinch roller, a shearing machine, a deburring machine, and a burr purging device. The hot coil box, pinch roller , a shearing machine, an intermediate blank connecting device, a deburring machine and a burr purging device are sequentially arranged between the roughing mill and the first finishing mill of the hot continuous rolling production line.

The working principle of the present invention is as follows:

After the intermediate billet is uncoiled by the hot coil box, it is clamped and driven forward by the pinch roller; when the shearing machine detects the head and tail of the intermediate billet, it will cut the head and tail of the intermediate billet so that the head and tail of the intermediate billet are aligned. flat; when the intermediate blank connecting device staying at the initial position detects the belt tail of the front intermediate blank, the intermediate blank connecting device starts and accelerates immediately, once it catches up with the front intermediate blank and makes its tail on the intermediate blank connecting device position, the outlet clamping device clamps it, and the intermediate blank connecting device runs synchronously with the intermediate blank; when the lead of the rear intermediate blank catches up with the front intermediate blank driven by the pinch roller, the inlet clamping device It is clamped; the friction disc transmission device is started, and the rotating friction disc is gradually pressed down to rub the connecting end faces of the front and rear block middle billets. When the temperature rises to a viscoplastic state, the friction disc lifts up quickly, and the end face of the head of the middle billet of the rear block moves forward quickly to meet the end face of the tail of the middle billet of the front block under the action of the upsetting device and pinch rollers, and the upsetting force is continuously applied , connect the front and rear two intermediate blanks together; then, loosen the upper and lower clamping blocks of the entrance and exit clamping device, at the same time, the intermediate blank connecting device decelerates, and then quickly returns to its initial position, completing a intermediate blank connection cycle, Enter the next round of connection; when the connected intermediate blank passes through the deburring machine, the flashes on the upper and lower surfaces of the connection are removed, and when passing through the burr blowing device, the flashes and burrs are completely blown off. The mill is ready.

The beneficial effects of the present invention are as follows:

1. The equipment is simple:

It is only necessary to set up a set of pinch rolls, a set of shears, a set of intermediate billet connecting devices, and a set of deburring machines between the hot coil box after the roughing mill of the conventional hot continuous rolling production line and the first finishing mill. And a set of burr purging device. Since the oxide film on the end face will be broken and extruded during upsetting, no special treatment such as descaling is required.

2. Fast connection speed:

Since the temperature of the intermediate billet itself reaches 950°C to 1100°C, it only takes a short time of friction to reach a viscoplastic state suitable for welding.

3. High connection strength, suitable for connecting slabs of different materials:

Friction welding is used, the material to be welded does not melt, the metal in the welding zone is forged structure, and there is no defect of fusion welding; under the action of upsetting pressure, some mechanical metallurgical effects are produced in the welding zone, and the friction surface will produce self-cleaning effect, which is not There is an oxide layer; the friction welding time is short, the heat-affected zone is narrow, and the structure of the heat-affected zone has no obvious coarsening; due to friction, the requirements for the shear quality of the end face of the intermediate billet can be reduced, and the upsetting pressure will crush and extrude Oxidized metal and other harmful impurities on the connection end surface, so the step of removing the oxide layer on the connection end surface of the intermediate billet before connection can be omitted, the process and equipment can be simplified, and the joint metal can be forged under pressure to promote grain refinement, thereby Improve the mechanical properties of joints. These characteristics are conducive to obtaining welded joints with the same strength as the base metal, and also determine the wide process adaptability of the device, which is suitable for the connection of slabs of different materials.

Description of drawings

Fig. 1 is a structural schematic diagram of an embodiment of an intermediate blank connecting device of the present invention;

Fig. 2 is a schematic diagram of the structure of the friction disc, the pressed tool holder and the traverse tool holder in Fig. 1;

Fig. 3 is a schematic diagram of the friction disc in Fig. 2 moving up and down with the press of the knife rest;

Fig. 4 is a schematic diagram of the lateral movement of the friction disc in Fig. 2 along with the lateral movement of the tool rest;

Fig. 5 is a schematic structural view of an embodiment of the intermediate blank connecting system of the present invention.

Part number description:

1 Friction disc

2 Friction disc traversing tool holder

3 The friction disc presses down on the knife holder

4 power mechanism

41 Retractable cardan shaft

5 Entry clamping device

6 Outlet clamping device

7 Upsetting device

8 intermediate billets

81 Rear middle billet

82 front middle billet

100 roughing mill

200 hot coil boxes

300 pinch roller

400 shears

500 intermediate billet connecting device

600 deburring machine

700 Burr purging device

800 The first finishing mill

detailed description

The implementation of the present invention will be illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

Example

As shown in Figure 1, the present invention provides an intermediate blank connecting device for connecting the front intermediate blank 82 and the rear intermediate blank 81, including an inlet clamping device 5, an outlet clamping device 6, a friction disc 1 and a top Forging device 7, wherein, the inlet clamping device 5 is used to clamp the rear block intermediate billet 81, the outlet clamping device 6 is used to clamp the front block intermediate billet 82, and the friction disc 1 is located between the inlet clamping device 5 and the outlet clamping Between the devices 6, it is used to rub the connecting end faces of the front block intermediate blank 82 and the rear block intermediate blank 81. The upsetting device 7 is located in front of the entrance clamping device 5, and the upsetting device 7 moves backward through the entrance clamping device 5. The intermediate billet 81 applies an upsetting force. It also includes a driving mechanism, which directly or indirectly drives the friction disc 1 to rotate and move. There are one or more friction discs 1, and when there are multiple friction discs 1, they are arranged in a line at equal intervals along the width direction of the intermediate billet.

Further, it also includes a friction disc traversing tool rest 2 and a friction disc depressing tool rest 3, the friction disc 1 is installed on the friction disc traversing tool rest 2, and the friction disc traversing tool rest 2 is installed on the friction disc depressing knife Inside shelf 3. The friction disc 1 is driven by the friction disc traversing tool holder 2, and moves back and forth quickly along the width direction of the intermediate billet 8. The reciprocating movement distance should ensure that the friction disc 1 and the entire cross section of the intermediate billet 8 are in contact; the friction disc 1 and the friction disc traverse The knife rest 2 is pressed down by the friction disc and the knife rest 3 is pressed down, and the friction disc 1 penetrates below the lower surface of the intermediate billet 8; ensuring that the end faces of the intermediate billet 8 in the width and thickness directions are all rubbed. In the case that a single friction disc 1 can cover the width of the intermediate billet, the friction disc traversing tool holder 2 can also be omitted, and no lateral movement is performed.

Specifically, the driving mechanism includes a power mechanism for driving the friction disc 1 to rotate, and a pushing mechanism for moving the friction disc 1 laterally, horizontally and vertically. Wherein the power mechanism adopts an electric motor, and the electric motor is installed on the motor bracket, and is connected with the friction disc 1 through the telescopic universal joint shaft 41, and the motor bracket can be installed on the main frame of the intermediate billet connection device, and the motor, the motor bracket and the telescopic The universal joint shaft 41 moves together with the intermediate blank connecting device 500 as a whole. The pushing mechanism drives the friction disc to move the tool holder 2 laterally and the friction disc to depress the tool holder 3 to move, which can be driven by air pressure, hydraulic pressure or electric motor.

Further, in order to ensure the stability of clamping, both the inlet clamping device 5 and the outlet clamping device 6 are provided with upper and lower clamping blocks, and the length of the upper and lower clamping blocks is greater than the width of the intermediate billet. In addition, if the upsetting device 7 has a clamping function, the inlet clamping device 5 can be omitted. The upsetting device 7 is mainly to apply force to the rear middle blank 81, so that the rear middle blank 81 can quickly compress and continuously compress the front middle blank 82. It can be driven by a motor or hydraulic pressure, and the upsetting can be enlarged by a lever force. The inlet clamping device 5 and the outlet clamping device 6 are driven by hydraulic pressure, including upper and lower clamping blocks, mainly for clamping and supporting the intermediate billet.

The upsetting device 7 , the inlet clamping device and the outlet clamping device 6 are relatively mature technologies in this field, and will not be repeated here.

In order to ensure that the friction disc is in contact with the entire cross-section of the intermediate billet when the friction disc traverses the tool holder 2. The maximum distance S2 formed on the blank 8, the distance S3 from the side of the intermediate blank 8 when the friction disc 1 is pressed down, the following relationship is guaranteed between the three: S1>S2>S3.

As shown in Figure 5, the present invention also provides an intermediate blank connection system, including the above-mentioned intermediate blank connection device, and also includes a hot coil box 200, a pinch roller 300, a shearing machine 400, a deburring machine 600 and a burr blower The device 700, the hot coil box 200, the pinch roll 300, the shearing machine 400, the intermediate billet connection device 500, the deburring machine 600 and the burr purging device 700 are arranged successively between the roughing mill 100 and the first rack of the hot continuous rolling production line. Finishing mill between 800.

the system,

After the intermediate billet is uncoiled by the hot coil box 200, it is clamped and driven forward by the pinch roller 300; when the shearing machine 400 detects the head and tail of the intermediate billet 8, it cuts the head and tail of the intermediate billet 8, so that the intermediate billet 8. The head and the tail are flush; when the middle blank connecting device 500 staying at the initial position detects the tail of the front block middle blank 82, the middle blank connecting device 500 starts and accelerates immediately, once it catches up with the front block middle blank 82 and Make its tail in place on the intermediate blank connecting device 500, the outlet clamping device 6 clamps it, and the intermediate blank connecting device 500 runs synchronously with the intermediate blank; When driving to catch up with the middle blank 82 of the front block, the inlet clamping device 5 clamps it; the friction disc transmission device 4 is started, and the rotating friction disc 1 is gradually pressed down to rub the connecting end faces of the front and rear middle blanks. The forging device 7 applies frictional pressure to the rear block middle billet 81, so that the temperature of the end face of the middle billet and the surrounding area rapidly rises to a viscoplastic state. Under the action of the pinch roller 300, quickly move forward to meet the end face of the tail of the front intermediate billet 82, and continue to apply upsetting force to connect the front and rear intermediate billets together; then, loosen the upper and lower clamping blocks of the entrance and exit clamping device , at the same time, the intermediate blank connecting device 500 decelerates, then quickly returns to its initial position, completes an intermediate blank connection cycle, and enters the next round of connection; when the connected intermediate blank 8 passes through the deburring machine 600, the connection point Flashes on the surface are removed, and when passing through the burr purging device 700 , the flashes and burrs are completely blown off, ready to enter the finishing mill 800 .

The invention has a simple structure and does not need special treatment such as descaling because the oxide film on the end face will be broken and extruded during upset forging.

Fast connection speed: Since the temperature of the intermediate blank itself reaches 950°C to 1100°C, it only takes a short time of friction to reach a viscoplastic state suitable for welding.

High connection strength, suitable for the connection of slabs of different materials: the friction welding method is adopted, the material to be welded does not melt, the metal in the welding zone is forged structure, and there is no defect of melting welding; under the action of upsetting pressure, the welding zone produces Some mechanical metallurgical effects, and the friction surface will produce self-cleaning effect, there is no oxide layer; the friction welding time is short, the heat-affected zone is narrow, and the structure of the heat-affected zone has no obvious coarsening. These characteristics are conducive to obtaining welded joints with the same strength as the base metal, and also determine the wide process adaptability of the device, which is suitable for the connection of slabs of different materials.

Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention.

Claims (9)

1. a kind of middle base attachment means, it is characterised in that：Including for clamping the outlet clamping device of base in the middle of preceding block, being used for The entrance clamping device of base in the middle of block after clamping, rubbed for the connecting end surface to base in the middle of base in the middle of preceding piece and rear block Frictional disk and the upsetting machine for applying upset force, the frictional disk be located at entrance clamping device with outlet clamping device it Between, the frictional disk is connected with for driving frictional disk to rotate and mobile drive mechanism.

2. a kind of middle base attachment means according to claim 1, it is characterised in that：Also include the traversing knife rest of frictional disk and Frictional disk depresses knife rest, and the frictional disk is arranged on the traversing knife rest of frictional disk, and the traversing knife rest of frictional disk is arranged on frictional disk pressure In lower slide, the drive mechanism includes the actuating unit for driving frictional disk to rotate and drives the traversing knife rest of frictional disk laterally past The multiple mobile and vertically movable pushing mechanism of driving frictional disk pressure knife rest.

3. a kind of middle base attachment means according to claim 2, it is characterised in that：The frictional disk it is traversing when along centre Base width is moved back and forth, and traversing distance ensures that frictional disk and whole middle base cross section touch.

4. a kind of middle base attachment means according to Claims 2 or 3, it is characterised in that：It is deep when the frictional disk is descending Enter to below middle base lower surface.

5. a kind of middle base attachment means according to claim 1-3 any one, it is characterised in that：The entrance clamping Device and outlet clamping device include upper and lower grip block, and the upper and lower clamping block length is more than the width of middle base.

6. a kind of middle base attachment means according to claim 1-3 any one, it is characterised in that：The frictional disk is One or more, when frictional disk is for multiple, along the middle equidistant word order of base width.

7. a kind of middle base attachment means according to claim 2, it is characterised in that：The frictional disk passes through scalable ten thousand It is connected with actuating unit to spindle.

8. a kind of middle base attachment means according to claim 1, it is characterised in that：The upsetting machine is located at inlet clip Before holding device, upsetting machine applies upset force by base in the middle of entrance clamping device backward block.

9. a kind of middle base connection system, including a kind of middle base attachment means described in claim 1-8 any one, it is special Levy and be：Also include Coil Box, pinch roll, cutter, flash trimmer and burr blow device, the Coil Box, pinch roll, cut Cut machine, middle base attachment means, flash trimmer and burr blow device and be successively set on hot continuous rolling production line roughing mill and first Between frame finishing mill.